Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * tablecmds.c
4 : * Commands for creating and altering table structures and settings
5 : *
6 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/commands/tablecmds.c
12 : *
13 : *-------------------------------------------------------------------------
14 : */
15 : #include "postgres.h"
16 :
17 : #include "access/attmap.h"
18 : #include "access/genam.h"
19 : #include "access/gist.h"
20 : #include "access/heapam.h"
21 : #include "access/heapam_xlog.h"
22 : #include "access/multixact.h"
23 : #include "access/reloptions.h"
24 : #include "access/relscan.h"
25 : #include "access/sysattr.h"
26 : #include "access/tableam.h"
27 : #include "access/toast_compression.h"
28 : #include "access/tupconvert.h"
29 : #include "access/xact.h"
30 : #include "access/xlog.h"
31 : #include "access/xloginsert.h"
32 : #include "catalog/catalog.h"
33 : #include "catalog/heap.h"
34 : #include "catalog/index.h"
35 : #include "catalog/namespace.h"
36 : #include "catalog/objectaccess.h"
37 : #include "catalog/partition.h"
38 : #include "catalog/pg_am.h"
39 : #include "catalog/pg_attrdef.h"
40 : #include "catalog/pg_collation.h"
41 : #include "catalog/pg_constraint.h"
42 : #include "catalog/pg_depend.h"
43 : #include "catalog/pg_extension_d.h"
44 : #include "catalog/pg_foreign_table.h"
45 : #include "catalog/pg_inherits.h"
46 : #include "catalog/pg_largeobject.h"
47 : #include "catalog/pg_largeobject_metadata.h"
48 : #include "catalog/pg_namespace.h"
49 : #include "catalog/pg_opclass.h"
50 : #include "catalog/pg_policy.h"
51 : #include "catalog/pg_proc.h"
52 : #include "catalog/pg_publication_rel.h"
53 : #include "catalog/pg_rewrite.h"
54 : #include "catalog/pg_statistic_ext.h"
55 : #include "catalog/pg_tablespace.h"
56 : #include "catalog/pg_trigger.h"
57 : #include "catalog/pg_type.h"
58 : #include "catalog/storage.h"
59 : #include "catalog/storage_xlog.h"
60 : #include "catalog/toasting.h"
61 : #include "commands/comment.h"
62 : #include "commands/defrem.h"
63 : #include "commands/event_trigger.h"
64 : #include "commands/extension.h"
65 : #include "commands/repack.h"
66 : #include "commands/sequence.h"
67 : #include "commands/tablecmds.h"
68 : #include "commands/tablespace.h"
69 : #include "commands/trigger.h"
70 : #include "commands/typecmds.h"
71 : #include "commands/user.h"
72 : #include "commands/vacuum.h"
73 : #include "common/int.h"
74 : #include "executor/executor.h"
75 : #include "foreign/fdwapi.h"
76 : #include "foreign/foreign.h"
77 : #include "miscadmin.h"
78 : #include "nodes/makefuncs.h"
79 : #include "nodes/nodeFuncs.h"
80 : #include "nodes/parsenodes.h"
81 : #include "optimizer/optimizer.h"
82 : #include "parser/parse_coerce.h"
83 : #include "parser/parse_collate.h"
84 : #include "parser/parse_expr.h"
85 : #include "parser/parse_relation.h"
86 : #include "parser/parse_type.h"
87 : #include "parser/parse_utilcmd.h"
88 : #include "parser/parser.h"
89 : #include "partitioning/partbounds.h"
90 : #include "partitioning/partdesc.h"
91 : #include "pgstat.h"
92 : #include "rewrite/rewriteDefine.h"
93 : #include "rewrite/rewriteHandler.h"
94 : #include "rewrite/rewriteManip.h"
95 : #include "storage/bufmgr.h"
96 : #include "storage/lmgr.h"
97 : #include "storage/lock.h"
98 : #include "storage/predicate.h"
99 : #include "storage/smgr.h"
100 : #include "tcop/utility.h"
101 : #include "utils/acl.h"
102 : #include "utils/builtins.h"
103 : #include "utils/fmgroids.h"
104 : #include "utils/inval.h"
105 : #include "utils/lsyscache.h"
106 : #include "utils/memutils.h"
107 : #include "utils/partcache.h"
108 : #include "utils/relcache.h"
109 : #include "utils/ruleutils.h"
110 : #include "utils/snapmgr.h"
111 : #include "utils/syscache.h"
112 : #include "utils/timestamp.h"
113 : #include "utils/typcache.h"
114 : #include "utils/usercontext.h"
115 :
116 : /*
117 : * ON COMMIT action list
118 : */
119 : typedef struct OnCommitItem
120 : {
121 : Oid relid; /* relid of relation */
122 : OnCommitAction oncommit; /* what to do at end of xact */
123 :
124 : /*
125 : * If this entry was created during the current transaction,
126 : * creating_subid is the ID of the creating subxact; if created in a prior
127 : * transaction, creating_subid is zero. If deleted during the current
128 : * transaction, deleting_subid is the ID of the deleting subxact; if no
129 : * deletion request is pending, deleting_subid is zero.
130 : */
131 : SubTransactionId creating_subid;
132 : SubTransactionId deleting_subid;
133 : } OnCommitItem;
134 :
135 : static List *on_commits = NIL;
136 :
137 :
138 : /*
139 : * State information for ALTER TABLE
140 : *
141 : * The pending-work queue for an ALTER TABLE is a List of AlteredTableInfo
142 : * structs, one for each table modified by the operation (the named table
143 : * plus any child tables that are affected). We save lists of subcommands
144 : * to apply to this table (possibly modified by parse transformation steps);
145 : * these lists will be executed in Phase 2. If a Phase 3 step is needed,
146 : * necessary information is stored in the constraints and newvals lists.
147 : *
148 : * Phase 2 is divided into multiple passes; subcommands are executed in
149 : * a pass determined by subcommand type.
150 : */
151 :
152 : typedef enum AlterTablePass
153 : {
154 : AT_PASS_UNSET = -1, /* UNSET will cause ERROR */
155 : AT_PASS_DROP, /* DROP (all flavors) */
156 : AT_PASS_ALTER_TYPE, /* ALTER COLUMN TYPE */
157 : AT_PASS_ADD_COL, /* ADD COLUMN */
158 : AT_PASS_SET_EXPRESSION, /* ALTER SET EXPRESSION */
159 : AT_PASS_OLD_INDEX, /* re-add existing indexes */
160 : AT_PASS_OLD_CONSTR, /* re-add existing constraints */
161 : /* We could support a RENAME COLUMN pass here, but not currently used */
162 : AT_PASS_ADD_CONSTR, /* ADD constraints (initial examination) */
163 : AT_PASS_COL_ATTRS, /* set column attributes, eg NOT NULL */
164 : AT_PASS_ADD_INDEXCONSTR, /* ADD index-based constraints */
165 : AT_PASS_ADD_INDEX, /* ADD indexes */
166 : AT_PASS_ADD_OTHERCONSTR, /* ADD other constraints, defaults */
167 : AT_PASS_MISC, /* other stuff */
168 : } AlterTablePass;
169 :
170 : #define AT_NUM_PASSES (AT_PASS_MISC + 1)
171 :
172 : typedef struct AlteredTableInfo
173 : {
174 : /* Information saved before any work commences: */
175 : Oid relid; /* Relation to work on */
176 : char relkind; /* Its relkind */
177 : TupleDesc oldDesc; /* Pre-modification tuple descriptor */
178 :
179 : /*
180 : * Transiently set during Phase 2, normally set to NULL.
181 : *
182 : * ATRewriteCatalogs sets this when it starts, and closes when ATExecCmd
183 : * returns control. This can be exploited by ATExecCmd subroutines to
184 : * close/reopen across transaction boundaries.
185 : */
186 : Relation rel;
187 :
188 : /* Information saved by Phase 1 for Phase 2: */
189 : List *subcmds[AT_NUM_PASSES]; /* Lists of AlterTableCmd */
190 : /* Information saved by Phases 1/2 for Phase 3: */
191 : List *constraints; /* List of NewConstraint */
192 : List *newvals; /* List of NewColumnValue */
193 : List *afterStmts; /* List of utility command parsetrees */
194 : bool verify_new_notnull; /* T if we should recheck NOT NULL */
195 : int rewrite; /* Reason for forced rewrite, if any */
196 : bool chgAccessMethod; /* T if SET ACCESS METHOD is used */
197 : Oid newAccessMethod; /* new access method; 0 means no change,
198 : * if above is true */
199 : Oid newTableSpace; /* new tablespace; 0 means no change */
200 : bool chgPersistence; /* T if SET LOGGED/UNLOGGED is used */
201 : char newrelpersistence; /* if above is true */
202 : Expr *partition_constraint; /* for attach partition validation */
203 : /* true, if validating default due to some other attach/detach */
204 : bool validate_default;
205 : /* Objects to rebuild after completing ALTER TYPE operations */
206 : List *changedConstraintOids; /* OIDs of constraints to rebuild */
207 : List *changedConstraintDefs; /* string definitions of same */
208 : List *changedIndexOids; /* OIDs of indexes to rebuild */
209 : List *changedIndexDefs; /* string definitions of same */
210 : char *replicaIdentityIndex; /* index to reset as REPLICA IDENTITY */
211 : char *clusterOnIndex; /* index to use for CLUSTER */
212 : List *changedStatisticsOids; /* OIDs of statistics to rebuild */
213 : List *changedStatisticsDefs; /* string definitions of same */
214 : } AlteredTableInfo;
215 :
216 : /* Struct describing one new constraint to check in Phase 3 scan */
217 : /* Note: new not-null constraints are handled elsewhere */
218 : typedef struct NewConstraint
219 : {
220 : char *name; /* Constraint name, or NULL if none */
221 : ConstrType contype; /* CHECK or FOREIGN */
222 : Oid refrelid; /* PK rel, if FOREIGN */
223 : Oid refindid; /* OID of PK's index, if FOREIGN */
224 : bool conwithperiod; /* Whether the new FOREIGN KEY uses PERIOD */
225 : Oid conid; /* OID of pg_constraint entry, if FOREIGN */
226 : Node *qual; /* Check expr or CONSTR_FOREIGN Constraint */
227 : ExprState *qualstate; /* Execution state for CHECK expr */
228 : } NewConstraint;
229 :
230 : /*
231 : * Struct describing one new column value that needs to be computed during
232 : * Phase 3 copy (this could be either a new column with a non-null default, or
233 : * a column that we're changing the type of). Columns without such an entry
234 : * are just copied from the old table during ATRewriteTable. Note that the
235 : * expr is an expression over *old* table values, except when is_generated
236 : * is true; then it is an expression over columns of the *new* tuple.
237 : */
238 : typedef struct NewColumnValue
239 : {
240 : AttrNumber attnum; /* which column */
241 : Expr *expr; /* expression to compute */
242 : ExprState *exprstate; /* execution state */
243 : bool is_generated; /* is it a GENERATED expression? */
244 : } NewColumnValue;
245 :
246 : /*
247 : * Error-reporting support for RemoveRelations
248 : */
249 : struct dropmsgstrings
250 : {
251 : char kind;
252 : int nonexistent_code;
253 : const char *nonexistent_msg;
254 : const char *skipping_msg;
255 : const char *nota_msg;
256 : const char *drophint_msg;
257 : };
258 :
259 : static const struct dropmsgstrings dropmsgstringarray[] = {
260 : {RELKIND_RELATION,
261 : ERRCODE_UNDEFINED_TABLE,
262 : gettext_noop("table \"%s\" does not exist"),
263 : gettext_noop("table \"%s\" does not exist, skipping"),
264 : gettext_noop("\"%s\" is not a table"),
265 : gettext_noop("Use DROP TABLE to remove a table.")},
266 : {RELKIND_SEQUENCE,
267 : ERRCODE_UNDEFINED_TABLE,
268 : gettext_noop("sequence \"%s\" does not exist"),
269 : gettext_noop("sequence \"%s\" does not exist, skipping"),
270 : gettext_noop("\"%s\" is not a sequence"),
271 : gettext_noop("Use DROP SEQUENCE to remove a sequence.")},
272 : {RELKIND_VIEW,
273 : ERRCODE_UNDEFINED_TABLE,
274 : gettext_noop("view \"%s\" does not exist"),
275 : gettext_noop("view \"%s\" does not exist, skipping"),
276 : gettext_noop("\"%s\" is not a view"),
277 : gettext_noop("Use DROP VIEW to remove a view.")},
278 : {RELKIND_MATVIEW,
279 : ERRCODE_UNDEFINED_TABLE,
280 : gettext_noop("materialized view \"%s\" does not exist"),
281 : gettext_noop("materialized view \"%s\" does not exist, skipping"),
282 : gettext_noop("\"%s\" is not a materialized view"),
283 : gettext_noop("Use DROP MATERIALIZED VIEW to remove a materialized view.")},
284 : {RELKIND_INDEX,
285 : ERRCODE_UNDEFINED_OBJECT,
286 : gettext_noop("index \"%s\" does not exist"),
287 : gettext_noop("index \"%s\" does not exist, skipping"),
288 : gettext_noop("\"%s\" is not an index"),
289 : gettext_noop("Use DROP INDEX to remove an index.")},
290 : {RELKIND_COMPOSITE_TYPE,
291 : ERRCODE_UNDEFINED_OBJECT,
292 : gettext_noop("type \"%s\" does not exist"),
293 : gettext_noop("type \"%s\" does not exist, skipping"),
294 : gettext_noop("\"%s\" is not a type"),
295 : gettext_noop("Use DROP TYPE to remove a type.")},
296 : {RELKIND_FOREIGN_TABLE,
297 : ERRCODE_UNDEFINED_OBJECT,
298 : gettext_noop("foreign table \"%s\" does not exist"),
299 : gettext_noop("foreign table \"%s\" does not exist, skipping"),
300 : gettext_noop("\"%s\" is not a foreign table"),
301 : gettext_noop("Use DROP FOREIGN TABLE to remove a foreign table.")},
302 : {RELKIND_PARTITIONED_TABLE,
303 : ERRCODE_UNDEFINED_TABLE,
304 : gettext_noop("table \"%s\" does not exist"),
305 : gettext_noop("table \"%s\" does not exist, skipping"),
306 : gettext_noop("\"%s\" is not a table"),
307 : gettext_noop("Use DROP TABLE to remove a table.")},
308 : {RELKIND_PARTITIONED_INDEX,
309 : ERRCODE_UNDEFINED_OBJECT,
310 : gettext_noop("index \"%s\" does not exist"),
311 : gettext_noop("index \"%s\" does not exist, skipping"),
312 : gettext_noop("\"%s\" is not an index"),
313 : gettext_noop("Use DROP INDEX to remove an index.")},
314 : {RELKIND_PROPGRAPH,
315 : ERRCODE_UNDEFINED_OBJECT,
316 : gettext_noop("property graph \"%s\" does not exist"),
317 : gettext_noop("property graph \"%s\" does not exist, skipping"),
318 : gettext_noop("\"%s\" is not a property graph"),
319 : gettext_noop("Use DROP PROPERTY GRAPH to remove a property graph.")},
320 : {'\0', 0, NULL, NULL, NULL, NULL}
321 : };
322 :
323 : /* communication between RemoveRelations and RangeVarCallbackForDropRelation */
324 : struct DropRelationCallbackState
325 : {
326 : /* These fields are set by RemoveRelations: */
327 : char expected_relkind;
328 : LOCKMODE heap_lockmode;
329 : /* These fields are state to track which subsidiary locks are held: */
330 : Oid heapOid;
331 : Oid partParentOid;
332 : /* These fields are passed back by RangeVarCallbackForDropRelation: */
333 : char actual_relkind;
334 : char actual_relpersistence;
335 : };
336 :
337 : /* Alter table target-type flags for ATSimplePermissions */
338 : #define ATT_TABLE 0x0001
339 : #define ATT_VIEW 0x0002
340 : #define ATT_MATVIEW 0x0004
341 : #define ATT_INDEX 0x0008
342 : #define ATT_COMPOSITE_TYPE 0x0010
343 : #define ATT_FOREIGN_TABLE 0x0020
344 : #define ATT_PARTITIONED_INDEX 0x0040
345 : #define ATT_SEQUENCE 0x0080
346 : #define ATT_PARTITIONED_TABLE 0x0100
347 :
348 : /*
349 : * ForeignTruncateInfo
350 : *
351 : * Information related to truncation of foreign tables. This is used for
352 : * the elements in a hash table. It uses the server OID as lookup key,
353 : * and includes a per-server list of all foreign tables involved in the
354 : * truncation.
355 : */
356 : typedef struct ForeignTruncateInfo
357 : {
358 : Oid serverid;
359 : List *rels;
360 : } ForeignTruncateInfo;
361 :
362 : /* Partial or complete FK creation in addFkConstraint() */
363 : typedef enum addFkConstraintSides
364 : {
365 : addFkReferencedSide,
366 : addFkReferencingSide,
367 : addFkBothSides,
368 : } addFkConstraintSides;
369 :
370 : /*
371 : * Hold extension dependencies of one partition index, during
372 : * MERGE/SPLIT PARTITION processing.
373 : *
374 : * collectPartitionIndexExtDeps() builds a list of these entries sorted by
375 : * parentIndexOid with exactly one entry per parent partitioned index; the
376 : * list is then consumed by applyPartitionIndexExtDeps() to re-record the
377 : * same dependencies on the newly created partition's indexes.
378 : *
379 : * extensionOids is kept sorted ascending so that equality checks between
380 : * entries from different partitions can be done in a single pass.
381 : * indexOid is carried only so that conflict errors can cite specific
382 : * partition index names.
383 : */
384 : typedef struct PartitionIndexExtDepEntry
385 : {
386 : Oid parentIndexOid; /* OID of the parent partitioned index */
387 : Oid indexOid; /* OID of a representative partition index */
388 : List *extensionOids; /* OIDs of dependent extensions, sorted asc */
389 : } PartitionIndexExtDepEntry;
390 :
391 : /*
392 : * Partition tables are expected to be dropped when the parent partitioned
393 : * table gets dropped. Hence for partitioning we use AUTO dependency.
394 : * Otherwise, for regular inheritance use NORMAL dependency.
395 : */
396 : #define child_dependency_type(child_is_partition) \
397 : ((child_is_partition) ? DEPENDENCY_AUTO : DEPENDENCY_NORMAL)
398 :
399 : static void truncate_check_rel(Oid relid, Form_pg_class reltuple);
400 : static void truncate_check_perms(Oid relid, Form_pg_class reltuple);
401 : static void truncate_check_activity(Relation rel);
402 : static void RangeVarCallbackForTruncate(const RangeVar *relation,
403 : Oid relId, Oid oldRelId, void *arg);
404 : static List *MergeAttributes(List *columns, const List *supers, char relpersistence,
405 : bool is_partition, List **supconstr,
406 : List **supnotnulls);
407 : static List *MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced);
408 : static void MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef);
409 : static ColumnDef *MergeInheritedAttribute(List *inh_columns, int exist_attno, const ColumnDef *newdef);
410 : static void MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition);
411 : static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel);
412 : static void StoreCatalogInheritance(Oid relationId, List *supers,
413 : bool child_is_partition);
414 : static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
415 : int32 seqNumber, Relation inhRelation,
416 : bool child_is_partition);
417 : static int findAttrByName(const char *attributeName, const List *columns);
418 : static void AlterIndexNamespaces(Relation classRel, Relation rel,
419 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved);
420 : static void AlterSeqNamespaces(Relation classRel, Relation rel,
421 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
422 : LOCKMODE lockmode);
423 : static ObjectAddress ATExecAlterConstraint(List **wqueue, Relation rel,
424 : ATAlterConstraint *cmdcon,
425 : bool recurse, LOCKMODE lockmode);
426 : static bool ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon, Relation conrel,
427 : Relation tgrel, Relation rel, HeapTuple contuple,
428 : bool recurse, LOCKMODE lockmode);
429 : static bool ATExecAlterFKConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
430 : Relation conrel, Relation tgrel,
431 : Oid fkrelid, Oid pkrelid,
432 : HeapTuple contuple, LOCKMODE lockmode,
433 : Oid ReferencedParentDelTrigger,
434 : Oid ReferencedParentUpdTrigger,
435 : Oid ReferencingParentInsTrigger,
436 : Oid ReferencingParentUpdTrigger);
437 : static bool ATExecAlterCheckConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
438 : Relation conrel, HeapTuple contuple,
439 : bool recurse, bool recursing,
440 : LOCKMODE lockmode);
441 : static bool ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
442 : Relation conrel, Relation tgrel, Relation rel,
443 : HeapTuple contuple, bool recurse,
444 : List **otherrelids, LOCKMODE lockmode);
445 : static bool ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
446 : Relation conrel, Relation rel,
447 : HeapTuple contuple, LOCKMODE lockmode);
448 : static void AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
449 : bool deferrable, bool initdeferred,
450 : List **otherrelids);
451 : static void AlterFKConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
452 : Relation conrel, Relation tgrel,
453 : Oid fkrelid, Oid pkrelid,
454 : HeapTuple contuple, LOCKMODE lockmode,
455 : Oid ReferencedParentDelTrigger,
456 : Oid ReferencedParentUpdTrigger,
457 : Oid ReferencingParentInsTrigger,
458 : Oid ReferencingParentUpdTrigger);
459 : static void AlterCheckConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
460 : Relation conrel, Oid conrelid,
461 : bool recurse, bool recursing,
462 : LOCKMODE lockmode);
463 : static void AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
464 : Relation conrel, Relation tgrel, Relation rel,
465 : HeapTuple contuple, bool recurse,
466 : List **otherrelids, LOCKMODE lockmode);
467 : static void AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
468 : HeapTuple contuple);
469 : static ObjectAddress ATExecValidateConstraint(List **wqueue,
470 : Relation rel, char *constrName,
471 : bool recurse, bool recursing, LOCKMODE lockmode);
472 : static void QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
473 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode);
474 : static void QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
475 : char *constrName, HeapTuple contuple,
476 : bool recurse, bool recursing, LOCKMODE lockmode);
477 : static void QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
478 : HeapTuple contuple, bool recurse, bool recursing,
479 : LOCKMODE lockmode);
480 : static int transformColumnNameList(Oid relId, List *colList,
481 : int16 *attnums, Oid *atttypids, Oid *attcollids);
482 : static int transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
483 : List **attnamelist,
484 : int16 *attnums, Oid *atttypids, Oid *attcollids,
485 : Oid *opclasses, bool *pk_has_without_overlaps);
486 : static Oid transformFkeyCheckAttrs(Relation pkrel,
487 : int numattrs, int16 *attnums,
488 : bool with_period, Oid *opclasses,
489 : bool *pk_has_without_overlaps);
490 : static void checkFkeyPermissions(Relation rel, int16 *attnums, int natts);
491 : static CoercionPathType findFkeyCast(Oid targetTypeId, Oid sourceTypeId,
492 : Oid *funcid);
493 : static void validateForeignKeyConstraint(char *conname,
494 : Relation rel, Relation pkrel,
495 : Oid pkindOid, Oid constraintOid, bool hasperiod);
496 : static void CheckAlterTableIsSafe(Relation rel);
497 : static void ATController(AlterTableStmt *parsetree,
498 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
499 : AlterTableUtilityContext *context);
500 : static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
501 : bool recurse, bool recursing, LOCKMODE lockmode,
502 : AlterTableUtilityContext *context);
503 : static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
504 : AlterTableUtilityContext *context);
505 : static void ATExecCmd(List **wqueue, AlteredTableInfo *tab,
506 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
507 : AlterTableUtilityContext *context);
508 : static AlterTableCmd *ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab,
509 : Relation rel, AlterTableCmd *cmd,
510 : bool recurse, LOCKMODE lockmode,
511 : AlterTablePass cur_pass,
512 : AlterTableUtilityContext *context);
513 : static void ATRewriteTables(AlterTableStmt *parsetree,
514 : List **wqueue, LOCKMODE lockmode,
515 : AlterTableUtilityContext *context);
516 : static void ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap);
517 : static AlteredTableInfo *ATGetQueueEntry(List **wqueue, Relation rel);
518 : static void ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets);
519 : static void ATSimpleRecursion(List **wqueue, Relation rel,
520 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
521 : AlterTableUtilityContext *context);
522 : static void ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode);
523 : static void ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
524 : LOCKMODE lockmode,
525 : AlterTableUtilityContext *context);
526 : static List *find_typed_table_dependencies(Oid typeOid, const char *typeName,
527 : DropBehavior behavior);
528 : static void ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
529 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
530 : AlterTableUtilityContext *context);
531 : static ObjectAddress ATExecAddColumn(List **wqueue, AlteredTableInfo *tab,
532 : Relation rel, AlterTableCmd **cmd,
533 : bool recurse, bool recursing,
534 : LOCKMODE lockmode, AlterTablePass cur_pass,
535 : AlterTableUtilityContext *context);
536 : static bool check_for_column_name_collision(Relation rel, const char *colname,
537 : bool if_not_exists);
538 : static void add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid);
539 : static void add_column_collation_dependency(Oid relid, int32 attnum, Oid collid);
540 : static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
541 : LOCKMODE lockmode);
542 : static void set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
543 : bool is_valid, bool queue_validation);
544 : static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
545 : char *conName, char *colName,
546 : bool recurse, bool recursing,
547 : LOCKMODE lockmode);
548 : static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
549 : static bool ConstraintImpliedByRelConstraint(Relation scanrel,
550 : List *testConstraint, List *provenConstraint);
551 : static ObjectAddress ATExecColumnDefault(Relation rel, const char *colName,
552 : Node *newDefault, LOCKMODE lockmode);
553 : static ObjectAddress ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
554 : Node *newDefault);
555 : static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,
556 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
557 : static ObjectAddress ATExecSetIdentity(Relation rel, const char *colName,
558 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
559 : static ObjectAddress ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
560 : bool recurse, bool recursing);
561 : static ObjectAddress ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
562 : Node *newExpr, LOCKMODE lockmode);
563 : static void ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode);
564 : static ObjectAddress ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode);
565 : static ObjectAddress ATExecSetStatistics(Relation rel, const char *colName, int16 colNum,
566 : Node *newValue, LOCKMODE lockmode);
567 : static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
568 : Node *options, bool isReset, LOCKMODE lockmode);
569 : static ObjectAddress ATExecSetStorage(Relation rel, const char *colName,
570 : Node *newValue, LOCKMODE lockmode);
571 : static void ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
572 : AlterTableCmd *cmd, LOCKMODE lockmode,
573 : AlterTableUtilityContext *context);
574 : static ObjectAddress ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
575 : DropBehavior behavior,
576 : bool recurse, bool recursing,
577 : bool missing_ok, LOCKMODE lockmode,
578 : ObjectAddresses *addrs);
579 : static void ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
580 : bool recurse, LOCKMODE lockmode,
581 : AlterTableUtilityContext *context);
582 : static void verifyNotNullPKCompatible(HeapTuple tuple, const char *colname);
583 : static ObjectAddress ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
584 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
585 : static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
586 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
587 : static ObjectAddress ATExecAddConstraint(List **wqueue,
588 : AlteredTableInfo *tab, Relation rel,
589 : Constraint *newConstraint, bool recurse, bool is_readd,
590 : LOCKMODE lockmode);
591 : static char *ChooseForeignKeyConstraintNameAddition(List *colnames);
592 : static ObjectAddress ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
593 : IndexStmt *stmt, LOCKMODE lockmode);
594 : static ObjectAddress ATAddCheckNNConstraint(List **wqueue,
595 : AlteredTableInfo *tab, Relation rel,
596 : Constraint *constr,
597 : bool recurse, bool recursing, bool is_readd,
598 : LOCKMODE lockmode);
599 : static ObjectAddress ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab,
600 : Relation rel, Constraint *fkconstraint,
601 : bool recurse, bool recursing,
602 : LOCKMODE lockmode);
603 : static int validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
604 : int numfksetcols, int16 *fksetcolsattnums,
605 : List *fksetcols);
606 : static ObjectAddress addFkConstraint(addFkConstraintSides fkside,
607 : char *constraintname,
608 : Constraint *fkconstraint, Relation rel,
609 : Relation pkrel, Oid indexOid,
610 : Oid parentConstr,
611 : int numfks, int16 *pkattnum, int16 *fkattnum,
612 : Oid *pfeqoperators, Oid *ppeqoperators,
613 : Oid *ffeqoperators, int numfkdelsetcols,
614 : int16 *fkdelsetcols, bool is_internal,
615 : bool with_period);
616 : static void addFkRecurseReferenced(Constraint *fkconstraint,
617 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
618 : int numfks, int16 *pkattnum, int16 *fkattnum,
619 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
620 : int numfkdelsetcols, int16 *fkdelsetcols,
621 : bool old_check_ok,
622 : Oid parentDelTrigger, Oid parentUpdTrigger,
623 : bool with_period);
624 : static void addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint,
625 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
626 : int numfks, int16 *pkattnum, int16 *fkattnum,
627 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
628 : int numfkdelsetcols, int16 *fkdelsetcols,
629 : bool old_check_ok, LOCKMODE lockmode,
630 : Oid parentInsTrigger, Oid parentUpdTrigger,
631 : bool with_period);
632 : static void CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
633 : Relation partitionRel);
634 : static void CloneFkReferenced(Relation parentRel, Relation partitionRel);
635 : static void CloneFkReferencing(List **wqueue, Relation parentRel,
636 : Relation partRel);
637 : static void createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
638 : Constraint *fkconstraint, Oid constraintOid,
639 : Oid indexOid,
640 : Oid parentInsTrigger, Oid parentUpdTrigger,
641 : Oid *insertTrigOid, Oid *updateTrigOid);
642 : static void createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid,
643 : Constraint *fkconstraint, Oid constraintOid,
644 : Oid indexOid,
645 : Oid parentDelTrigger, Oid parentUpdTrigger,
646 : Oid *deleteTrigOid, Oid *updateTrigOid);
647 : static bool tryAttachPartitionForeignKey(List **wqueue,
648 : ForeignKeyCacheInfo *fk,
649 : Relation partition,
650 : Oid parentConstrOid, int numfks,
651 : AttrNumber *mapped_conkey, AttrNumber *confkey,
652 : Oid *conpfeqop,
653 : Oid parentInsTrigger,
654 : Oid parentUpdTrigger,
655 : Relation trigrel);
656 : static void AttachPartitionForeignKey(List **wqueue, Relation partition,
657 : Oid partConstrOid, Oid parentConstrOid,
658 : Oid parentInsTrigger, Oid parentUpdTrigger,
659 : Relation trigrel);
660 : static void RemoveInheritedConstraint(Relation conrel, Relation trigrel,
661 : Oid conoid, Oid conrelid);
662 : static void DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid,
663 : Oid confrelid, Oid conrelid);
664 : static void GetForeignKeyActionTriggers(Relation trigrel,
665 : Oid conoid, Oid confrelid, Oid conrelid,
666 : Oid *deleteTriggerOid,
667 : Oid *updateTriggerOid);
668 : static void GetForeignKeyCheckTriggers(Relation trigrel,
669 : Oid conoid, Oid confrelid, Oid conrelid,
670 : Oid *insertTriggerOid,
671 : Oid *updateTriggerOid);
672 : static void ATExecDropConstraint(Relation rel, const char *constrName,
673 : DropBehavior behavior, bool recurse,
674 : bool missing_ok, LOCKMODE lockmode);
675 : static ObjectAddress dropconstraint_internal(Relation rel,
676 : HeapTuple constraintTup, DropBehavior behavior,
677 : bool recurse, bool recursing,
678 : bool missing_ok, LOCKMODE lockmode);
679 : static void ATPrepAlterColumnType(List **wqueue,
680 : AlteredTableInfo *tab, Relation rel,
681 : bool recurse, bool recursing,
682 : AlterTableCmd *cmd, LOCKMODE lockmode,
683 : AlterTableUtilityContext *context);
684 : static bool ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno);
685 : static ObjectAddress ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
686 : AlterTableCmd *cmd, LOCKMODE lockmode);
687 : static void RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
688 : Relation rel, AttrNumber attnum, const char *colName);
689 : static void RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab);
690 : static void RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab);
691 : static void RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab);
692 : static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab,
693 : LOCKMODE lockmode);
694 : static void ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId,
695 : char *cmd, List **wqueue, LOCKMODE lockmode,
696 : bool rewrite);
697 : static void RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass,
698 : Oid objid, Relation rel, List *domname,
699 : const char *conname);
700 : static void TryReuseIndex(Oid oldId, IndexStmt *stmt);
701 : static void TryReuseForeignKey(Oid oldId, Constraint *con);
702 : static ObjectAddress ATExecAlterColumnGenericOptions(Relation rel, const char *colName,
703 : List *options, LOCKMODE lockmode);
704 : static void change_owner_fix_column_acls(Oid relationOid,
705 : Oid oldOwnerId, Oid newOwnerId);
706 : static void change_owner_recurse_to_sequences(Oid relationOid,
707 : Oid newOwnerId, LOCKMODE lockmode);
708 : static ObjectAddress ATExecClusterOn(Relation rel, const char *indexName,
709 : LOCKMODE lockmode);
710 : static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
711 : static void ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname);
712 : static void ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId);
713 : static void ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel,
714 : bool toLogged);
715 : static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
716 : const char *tablespacename, LOCKMODE lockmode);
717 : static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
718 : static void ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace);
719 : static void ATExecSetRelOptions(Relation rel, List *defList,
720 : AlterTableType operation,
721 : LOCKMODE lockmode);
722 : static void ATExecEnableDisableTrigger(Relation rel, const char *trigname,
723 : char fires_when, bool skip_system, bool recurse,
724 : LOCKMODE lockmode);
725 : static void ATExecEnableDisableRule(Relation rel, const char *rulename,
726 : char fires_when, LOCKMODE lockmode);
727 : static void ATPrepChangeInherit(Relation child_rel);
728 : static ObjectAddress ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode);
729 : static ObjectAddress ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode);
730 : static void drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
731 : DependencyType deptype);
732 : static ObjectAddress ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode);
733 : static void ATExecDropOf(Relation rel, LOCKMODE lockmode);
734 : static void ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode);
735 : static void ATExecGenericOptions(Relation rel, List *options);
736 : static void ATExecSetRowSecurity(Relation rel, bool rls);
737 : static void ATExecForceNoForceRowSecurity(Relation rel, bool force_rls);
738 : static ObjectAddress ATExecSetCompression(Relation rel,
739 : const char *column, Node *newValue, LOCKMODE lockmode);
740 :
741 : static void index_copy_data(Relation rel, RelFileLocator newrlocator);
742 : static const char *storage_name(char c);
743 :
744 : static void RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid,
745 : Oid oldRelOid, void *arg);
746 : static void RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid,
747 : Oid oldrelid, void *arg);
748 : static PartitionSpec *transformPartitionSpec(Relation rel, PartitionSpec *partspec);
749 : static void ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
750 : List **partexprs, Oid *partopclass, Oid *partcollation,
751 : PartitionStrategy strategy);
752 : static void CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition);
753 : static void RemoveInheritance(Relation child_rel, Relation parent_rel,
754 : bool expect_detached);
755 : static ObjectAddress ATExecAttachPartition(List **wqueue, Relation rel,
756 : PartitionCmd *cmd,
757 : AlterTableUtilityContext *context);
758 : static void AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel);
759 : static void QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
760 : List *partConstraint,
761 : bool validate_default);
762 : static void CloneRowTriggersToPartition(Relation parent, Relation partition);
763 : static void DropClonedTriggersFromPartition(Oid partitionId);
764 : static ObjectAddress ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab,
765 : Relation rel, RangeVar *name,
766 : bool concurrent);
767 : static void DetachPartitionFinalize(Relation rel, Relation partRel,
768 : bool concurrent, Oid defaultPartOid);
769 : static ObjectAddress ATExecDetachPartitionFinalize(Relation rel, RangeVar *name);
770 : static ObjectAddress ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx,
771 : RangeVar *name);
772 : static void validatePartitionedIndex(Relation partedIdx, Relation partedTbl);
773 : static void refuseDupeIndexAttach(Relation parentIdx, Relation partIdx,
774 : Relation partitionTbl);
775 : static void verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition);
776 : static List *GetParentedForeignKeyRefs(Relation partition);
777 : static void ATDetachCheckNoForeignKeyRefs(Relation partition);
778 : static char GetAttributeCompression(Oid atttypid, const char *compression);
779 : static char GetAttributeStorage(Oid atttypid, const char *storagemode);
780 :
781 : static void ATExecMergePartitions(List **wqueue, AlteredTableInfo *tab, Relation rel,
782 : PartitionCmd *cmd, AlterTableUtilityContext *context);
783 : static void ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab,
784 : Relation rel, PartitionCmd *cmd,
785 : AlterTableUtilityContext *context);
786 : static List *collectPartitionIndexExtDeps(List *partitionOids);
787 : static void applyPartitionIndexExtDeps(Oid newPartOid, List *extDepState);
788 : static void freePartitionIndexExtDeps(List *extDepState);
789 :
790 : /* ----------------------------------------------------------------
791 : * DefineRelation
792 : * Creates a new relation.
793 : *
794 : * stmt carries parsetree information from an ordinary CREATE TABLE statement.
795 : * The other arguments are used to extend the behavior for other cases:
796 : * relkind: relkind to assign to the new relation
797 : * ownerId: if not InvalidOid, use this as the new relation's owner.
798 : * typaddress: if not null, it's set to the pg_type entry's address.
799 : * queryString: for error reporting
800 : *
801 : * Note that permissions checks are done against current user regardless of
802 : * ownerId. A nonzero ownerId is used when someone is creating a relation
803 : * "on behalf of" someone else, so we still want to see that the current user
804 : * has permissions to do it.
805 : *
806 : * If successful, returns the address of the new relation.
807 : * ----------------------------------------------------------------
808 : */
809 : ObjectAddress
810 41842 : DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
811 : ObjectAddress *typaddress, const char *queryString)
812 : {
813 : char relname[NAMEDATALEN];
814 : Oid namespaceId;
815 : Oid relationId;
816 : Oid tablespaceId;
817 : Relation rel;
818 : TupleDesc descriptor;
819 : List *inheritOids;
820 : List *old_constraints;
821 : List *old_notnulls;
822 : List *rawDefaults;
823 : List *cookedDefaults;
824 : List *nncols;
825 41842 : List *connames = NIL;
826 : Datum reloptions;
827 : ListCell *listptr;
828 : AttrNumber attnum;
829 : bool partitioned;
830 41842 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
831 : Oid ofTypeId;
832 : ObjectAddress address;
833 : LOCKMODE parentLockmode;
834 41842 : Oid accessMethodId = InvalidOid;
835 :
836 : /*
837 : * Truncate relname to appropriate length (probably a waste of time, as
838 : * parser should have done this already).
839 : */
840 41842 : strlcpy(relname, stmt->relation->relname, NAMEDATALEN);
841 :
842 : /*
843 : * Check consistency of arguments
844 : */
845 41842 : if (stmt->oncommit != ONCOMMIT_NOOP
846 128 : && stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
847 8 : ereport(ERROR,
848 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
849 : errmsg("ON COMMIT can only be used on temporary tables")));
850 :
851 41834 : if (stmt->partspec != NULL)
852 : {
853 3601 : if (relkind != RELKIND_RELATION)
854 0 : elog(ERROR, "unexpected relkind: %d", (int) relkind);
855 :
856 3601 : relkind = RELKIND_PARTITIONED_TABLE;
857 3601 : partitioned = true;
858 : }
859 : else
860 38233 : partitioned = false;
861 :
862 41834 : if (relkind == RELKIND_PARTITIONED_TABLE &&
863 3601 : stmt->relation->relpersistence == RELPERSISTENCE_UNLOGGED)
864 4 : ereport(ERROR,
865 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
866 : errmsg("partitioned tables cannot be unlogged")));
867 :
868 : /*
869 : * Look up the namespace in which we are supposed to create the relation,
870 : * check we have permission to create there, lock it against concurrent
871 : * drop, and mark stmt->relation as RELPERSISTENCE_TEMP if a temporary
872 : * namespace is selected.
873 : */
874 : namespaceId =
875 41830 : RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
876 :
877 : /*
878 : * Security check: disallow creating temp tables from security-restricted
879 : * code. This is needed because calling code might not expect untrusted
880 : * tables to appear in pg_temp at the front of its search path.
881 : */
882 41830 : if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
883 2318 : && InSecurityRestrictedOperation())
884 0 : ereport(ERROR,
885 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
886 : errmsg("cannot create temporary table within security-restricted operation")));
887 :
888 : /*
889 : * Determine the lockmode to use when scanning parents. A self-exclusive
890 : * lock is needed here.
891 : *
892 : * For regular inheritance, if two backends attempt to add children to the
893 : * same parent simultaneously, and that parent has no pre-existing
894 : * children, then both will attempt to update the parent's relhassubclass
895 : * field, leading to a "tuple concurrently updated" error. Also, this
896 : * interlocks against a concurrent ANALYZE on the parent table, which
897 : * might otherwise be attempting to clear the parent's relhassubclass
898 : * field, if its previous children were recently dropped.
899 : *
900 : * If the child table is a partition, then we instead grab an exclusive
901 : * lock on the parent because its partition descriptor will be changed by
902 : * addition of the new partition.
903 : */
904 41830 : parentLockmode = (stmt->partbound != NULL ? AccessExclusiveLock :
905 : ShareUpdateExclusiveLock);
906 :
907 : /* Determine the list of OIDs of the parents. */
908 41830 : inheritOids = NIL;
909 49937 : foreach(listptr, stmt->inhRelations)
910 : {
911 8107 : RangeVar *rv = (RangeVar *) lfirst(listptr);
912 : Oid parentOid;
913 :
914 8107 : parentOid = RangeVarGetRelid(rv, parentLockmode, false);
915 :
916 : /*
917 : * Reject duplications in the list of parents.
918 : */
919 8107 : if (list_member_oid(inheritOids, parentOid))
920 0 : ereport(ERROR,
921 : (errcode(ERRCODE_DUPLICATE_TABLE),
922 : errmsg("relation \"%s\" would be inherited from more than once",
923 : get_rel_name(parentOid))));
924 :
925 8107 : inheritOids = lappend_oid(inheritOids, parentOid);
926 : }
927 :
928 : /*
929 : * Select tablespace to use: an explicitly indicated one, or (in the case
930 : * of a partitioned table) the parent's, if it has one.
931 : */
932 41830 : if (stmt->tablespacename)
933 : {
934 84 : tablespaceId = get_tablespace_oid(stmt->tablespacename, false);
935 :
936 80 : if (partitioned && tablespaceId == MyDatabaseTableSpace)
937 4 : ereport(ERROR,
938 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
939 : errmsg("cannot specify default tablespace for partitioned relations")));
940 : }
941 41746 : else if (stmt->partbound)
942 : {
943 : Assert(list_length(inheritOids) == 1);
944 6470 : tablespaceId = get_rel_tablespace(linitial_oid(inheritOids));
945 : }
946 : else
947 35276 : tablespaceId = InvalidOid;
948 :
949 : /* still nothing? use the default */
950 41822 : if (!OidIsValid(tablespaceId))
951 41720 : tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence,
952 : partitioned);
953 :
954 : /* Check permissions except when using database's default */
955 41818 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
956 : {
957 : AclResult aclresult;
958 :
959 118 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(),
960 : ACL_CREATE);
961 118 : if (aclresult != ACLCHECK_OK)
962 3 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
963 3 : get_tablespace_name(tablespaceId));
964 : }
965 :
966 : /* In all cases disallow placing user relations in pg_global */
967 41815 : if (tablespaceId == GLOBALTABLESPACE_OID)
968 12 : ereport(ERROR,
969 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
970 : errmsg("only shared relations can be placed in pg_global tablespace")));
971 :
972 : /* Identify user ID that will own the table */
973 41803 : if (!OidIsValid(ownerId))
974 41648 : ownerId = GetUserId();
975 :
976 : /*
977 : * Parse and validate reloptions, if any.
978 : */
979 41803 : reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
980 : true, false);
981 :
982 41791 : switch (relkind)
983 : {
984 10738 : case RELKIND_VIEW:
985 10738 : (void) view_reloptions(reloptions, true);
986 10726 : break;
987 3585 : case RELKIND_PARTITIONED_TABLE:
988 3585 : (void) partitioned_table_reloptions(reloptions, true);
989 3581 : break;
990 27468 : default:
991 27468 : (void) heap_reloptions(relkind, reloptions, true);
992 : }
993 :
994 41711 : if (stmt->ofTypename)
995 : {
996 : AclResult aclresult;
997 :
998 57 : ofTypeId = typenameTypeId(NULL, stmt->ofTypename);
999 :
1000 57 : aclresult = object_aclcheck(TypeRelationId, ofTypeId, GetUserId(), ACL_USAGE);
1001 57 : if (aclresult != ACLCHECK_OK)
1002 4 : aclcheck_error_type(aclresult, ofTypeId);
1003 : }
1004 : else
1005 41654 : ofTypeId = InvalidOid;
1006 :
1007 : /*
1008 : * Look up inheritance ancestors and generate relation schema, including
1009 : * inherited attributes. (Note that stmt->tableElts is destructively
1010 : * modified by MergeAttributes.)
1011 : */
1012 41547 : stmt->tableElts =
1013 41707 : MergeAttributes(stmt->tableElts, inheritOids,
1014 41707 : stmt->relation->relpersistence,
1015 41707 : stmt->partbound != NULL,
1016 : &old_constraints, &old_notnulls);
1017 :
1018 : /*
1019 : * Create a tuple descriptor from the relation schema. Note that this
1020 : * deals with column names, types, and in-descriptor NOT NULL flags, but
1021 : * not default values, NOT NULL or CHECK constraints; we handle those
1022 : * below.
1023 : */
1024 41547 : descriptor = BuildDescForRelation(stmt->tableElts);
1025 :
1026 : /*
1027 : * Find columns with default values and prepare for insertion of the
1028 : * defaults. Pre-cooked (that is, inherited) defaults go into a list of
1029 : * CookedConstraint structs that we'll pass to heap_create_with_catalog,
1030 : * while raw defaults go into a list of RawColumnDefault structs that will
1031 : * be processed by AddRelationNewConstraints. (We can't deal with raw
1032 : * expressions until we can do transformExpr.)
1033 : */
1034 41515 : rawDefaults = NIL;
1035 41515 : cookedDefaults = NIL;
1036 41515 : attnum = 0;
1037 :
1038 207856 : foreach(listptr, stmt->tableElts)
1039 : {
1040 166341 : ColumnDef *colDef = lfirst(listptr);
1041 :
1042 166341 : attnum++;
1043 166341 : if (colDef->raw_default != NULL)
1044 : {
1045 : RawColumnDefault *rawEnt;
1046 :
1047 : Assert(colDef->cooked_default == NULL);
1048 :
1049 2179 : rawEnt = palloc_object(RawColumnDefault);
1050 2179 : rawEnt->attnum = attnum;
1051 2179 : rawEnt->raw_default = colDef->raw_default;
1052 2179 : rawEnt->generated = colDef->generated;
1053 2179 : rawDefaults = lappend(rawDefaults, rawEnt);
1054 : }
1055 164162 : else if (colDef->cooked_default != NULL)
1056 : {
1057 : CookedConstraint *cooked;
1058 :
1059 350 : cooked = palloc_object(CookedConstraint);
1060 350 : cooked->contype = CONSTR_DEFAULT;
1061 350 : cooked->conoid = InvalidOid; /* until created */
1062 350 : cooked->name = NULL;
1063 350 : cooked->attnum = attnum;
1064 350 : cooked->expr = colDef->cooked_default;
1065 350 : cooked->is_enforced = true;
1066 350 : cooked->skip_validation = false;
1067 350 : cooked->is_local = true; /* not used for defaults */
1068 350 : cooked->inhcount = 0; /* ditto */
1069 350 : cooked->is_no_inherit = false;
1070 350 : cookedDefaults = lappend(cookedDefaults, cooked);
1071 : }
1072 : }
1073 :
1074 41515 : TupleDescFinalize(descriptor);
1075 :
1076 : /*
1077 : * For relations with table AM and partitioned tables, select access
1078 : * method to use: an explicitly indicated one, or (in the case of a
1079 : * partitioned table) the parent's, if it has one.
1080 : */
1081 41515 : if (stmt->accessMethod != NULL)
1082 : {
1083 : Assert(RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE);
1084 87 : accessMethodId = get_table_am_oid(stmt->accessMethod, false);
1085 : }
1086 41428 : else if (RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE)
1087 : {
1088 26680 : if (stmt->partbound)
1089 : {
1090 : Assert(list_length(inheritOids) == 1);
1091 6356 : accessMethodId = get_rel_relam(linitial_oid(inheritOids));
1092 : }
1093 :
1094 26680 : if (RELKIND_HAS_TABLE_AM(relkind) && !OidIsValid(accessMethodId))
1095 23086 : accessMethodId = get_table_am_oid(default_table_access_method, false);
1096 : }
1097 :
1098 : /*
1099 : * Create the relation. Inherited defaults and CHECK constraints are
1100 : * passed in for immediate handling --- since they don't need parsing,
1101 : * they can be stored immediately.
1102 : */
1103 41503 : relationId = heap_create_with_catalog(relname,
1104 : namespaceId,
1105 : tablespaceId,
1106 : InvalidOid,
1107 : InvalidOid,
1108 : ofTypeId,
1109 : ownerId,
1110 : accessMethodId,
1111 : descriptor,
1112 : list_concat(cookedDefaults,
1113 : old_constraints),
1114 : relkind,
1115 41503 : stmt->relation->relpersistence,
1116 : false,
1117 : false,
1118 : stmt->oncommit,
1119 : reloptions,
1120 : true,
1121 : allowSystemTableMods,
1122 : false,
1123 : InvalidOid,
1124 : typaddress);
1125 :
1126 : /*
1127 : * We must bump the command counter to make the newly-created relation
1128 : * tuple visible for opening.
1129 : */
1130 41468 : CommandCounterIncrement();
1131 :
1132 : /*
1133 : * Open the new relation and acquire exclusive lock on it. This isn't
1134 : * really necessary for locking out other backends (since they can't see
1135 : * the new rel anyway until we commit), but it keeps the lock manager from
1136 : * complaining about deadlock risks.
1137 : */
1138 41468 : rel = relation_open(relationId, AccessExclusiveLock);
1139 :
1140 : /*
1141 : * Now add any newly specified column default and generation expressions
1142 : * to the new relation. These are passed to us in the form of raw
1143 : * parsetrees; we need to transform them to executable expression trees
1144 : * before they can be added. The most convenient way to do that is to
1145 : * apply the parser's transformExpr routine, but transformExpr doesn't
1146 : * work unless we have a pre-existing relation. So, the transformation has
1147 : * to be postponed to this final step of CREATE TABLE.
1148 : *
1149 : * This needs to be before processing the partitioning clauses because
1150 : * those could refer to generated columns.
1151 : */
1152 41468 : if (rawDefaults)
1153 1838 : AddRelationNewConstraints(rel, rawDefaults, NIL,
1154 : true, true, false, queryString);
1155 :
1156 : /*
1157 : * Make column generation expressions visible for use by partitioning.
1158 : */
1159 41340 : CommandCounterIncrement();
1160 :
1161 : /* Process and store partition bound, if any. */
1162 41340 : if (stmt->partbound)
1163 : {
1164 : PartitionBoundSpec *bound;
1165 : ParseState *pstate;
1166 6418 : Oid parentId = linitial_oid(inheritOids),
1167 : defaultPartOid;
1168 : Relation parent,
1169 6418 : defaultRel = NULL;
1170 : ParseNamespaceItem *nsitem;
1171 :
1172 : /* Already have strong enough lock on the parent */
1173 6418 : parent = table_open(parentId, NoLock);
1174 :
1175 : /*
1176 : * We are going to try to validate the partition bound specification
1177 : * against the partition key of parentRel, so it better have one.
1178 : */
1179 6418 : if (parent->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1180 12 : ereport(ERROR,
1181 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1182 : errmsg("\"%s\" is not partitioned",
1183 : RelationGetRelationName(parent))));
1184 :
1185 : /*
1186 : * The partition constraint of the default partition depends on the
1187 : * partition bounds of every other partition. It is possible that
1188 : * another backend might be about to execute a query on the default
1189 : * partition table, and that the query relies on previously cached
1190 : * default partition constraints. We must therefore take a table lock
1191 : * strong enough to prevent all queries on the default partition from
1192 : * proceeding until we commit and send out a shared-cache-inval notice
1193 : * that will make them update their index lists.
1194 : *
1195 : * Order of locking: The relation being added won't be visible to
1196 : * other backends until it is committed, hence here in
1197 : * DefineRelation() the order of locking the default partition and the
1198 : * relation being added does not matter. But at all other places we
1199 : * need to lock the default relation before we lock the relation being
1200 : * added or removed i.e. we should take the lock in same order at all
1201 : * the places such that lock parent, lock default partition and then
1202 : * lock the partition so as to avoid a deadlock.
1203 : */
1204 : defaultPartOid =
1205 6406 : get_default_oid_from_partdesc(RelationGetPartitionDesc(parent,
1206 : true));
1207 6406 : if (OidIsValid(defaultPartOid))
1208 251 : defaultRel = table_open(defaultPartOid, AccessExclusiveLock);
1209 :
1210 : /* Transform the bound values */
1211 6406 : pstate = make_parsestate(NULL);
1212 6406 : pstate->p_sourcetext = queryString;
1213 :
1214 : /*
1215 : * Add an nsitem containing this relation, so that transformExpr
1216 : * called on partition bound expressions is able to report errors
1217 : * using a proper context.
1218 : */
1219 6406 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
1220 : NULL, false, false);
1221 6406 : addNSItemToQuery(pstate, nsitem, false, true, true);
1222 :
1223 6406 : bound = transformPartitionBound(pstate, parent, stmt->partbound);
1224 :
1225 : /*
1226 : * Check first that the new partition's bound is valid and does not
1227 : * overlap with any of existing partitions of the parent.
1228 : */
1229 6270 : check_new_partition_bound(relname, parent, bound, pstate);
1230 :
1231 : /*
1232 : * If the default partition exists, its partition constraints will
1233 : * change after the addition of this new partition such that it won't
1234 : * allow any row that qualifies for this new partition. So, check that
1235 : * the existing data in the default partition satisfies the constraint
1236 : * as it will exist after adding this partition.
1237 : */
1238 6194 : if (OidIsValid(defaultPartOid))
1239 : {
1240 231 : check_default_partition_contents(parent, defaultRel, bound);
1241 : /* Keep the lock until commit. */
1242 219 : table_close(defaultRel, NoLock);
1243 : }
1244 :
1245 : /* Update the pg_class entry. */
1246 6182 : StorePartitionBound(rel, parent, bound);
1247 :
1248 6182 : table_close(parent, NoLock);
1249 : }
1250 :
1251 : /* Store inheritance information for new rel. */
1252 41104 : StoreCatalogInheritance(relationId, inheritOids, stmt->partbound != NULL);
1253 :
1254 : /*
1255 : * Process the partitioning specification (if any) and store the partition
1256 : * key information into the catalog.
1257 : */
1258 41104 : if (partitioned)
1259 : {
1260 : ParseState *pstate;
1261 : int partnatts;
1262 : AttrNumber partattrs[PARTITION_MAX_KEYS];
1263 : Oid partopclass[PARTITION_MAX_KEYS];
1264 : Oid partcollation[PARTITION_MAX_KEYS];
1265 3581 : List *partexprs = NIL;
1266 :
1267 3581 : pstate = make_parsestate(NULL);
1268 3581 : pstate->p_sourcetext = queryString;
1269 :
1270 3581 : partnatts = list_length(stmt->partspec->partParams);
1271 :
1272 : /* Protect fixed-size arrays here and in executor */
1273 3581 : if (partnatts > PARTITION_MAX_KEYS)
1274 0 : ereport(ERROR,
1275 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
1276 : errmsg("cannot partition using more than %d columns",
1277 : PARTITION_MAX_KEYS)));
1278 :
1279 : /*
1280 : * We need to transform the raw parsetrees corresponding to partition
1281 : * expressions into executable expression trees. Like column defaults
1282 : * and CHECK constraints, we could not have done the transformation
1283 : * earlier.
1284 : */
1285 3581 : stmt->partspec = transformPartitionSpec(rel, stmt->partspec);
1286 :
1287 3561 : ComputePartitionAttrs(pstate, rel, stmt->partspec->partParams,
1288 : partattrs, &partexprs, partopclass,
1289 3561 : partcollation, stmt->partspec->strategy);
1290 :
1291 3473 : StorePartitionKey(rel, stmt->partspec->strategy, partnatts, partattrs,
1292 : partexprs,
1293 : partopclass, partcollation);
1294 :
1295 : /* make it all visible */
1296 3473 : CommandCounterIncrement();
1297 : }
1298 :
1299 : /*
1300 : * If we're creating a partition, create now all the indexes, triggers,
1301 : * FKs defined in the parent.
1302 : *
1303 : * We can't do it earlier, because DefineIndex wants to know the partition
1304 : * key which we just stored.
1305 : */
1306 40996 : if (stmt->partbound)
1307 : {
1308 6178 : Oid parentId = linitial_oid(inheritOids);
1309 : Relation parent;
1310 : List *idxlist;
1311 : ListCell *cell;
1312 :
1313 : /* Already have strong enough lock on the parent */
1314 6178 : parent = table_open(parentId, NoLock);
1315 6178 : idxlist = RelationGetIndexList(parent);
1316 :
1317 : /*
1318 : * For each index in the parent table, create one in the partition
1319 : */
1320 7271 : foreach(cell, idxlist)
1321 : {
1322 1105 : Relation idxRel = index_open(lfirst_oid(cell), AccessShareLock);
1323 : AttrMap *attmap;
1324 : IndexStmt *idxstmt;
1325 : Oid constraintOid;
1326 :
1327 1105 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
1328 : {
1329 24 : if (idxRel->rd_index->indisunique)
1330 8 : ereport(ERROR,
1331 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1332 : errmsg("cannot create foreign partition of partitioned table \"%s\"",
1333 : RelationGetRelationName(parent)),
1334 : errdetail("Table \"%s\" contains indexes that are unique.",
1335 : RelationGetRelationName(parent))));
1336 : else
1337 : {
1338 16 : index_close(idxRel, AccessShareLock);
1339 16 : continue;
1340 : }
1341 : }
1342 :
1343 1081 : attmap = build_attrmap_by_name(RelationGetDescr(rel),
1344 : RelationGetDescr(parent),
1345 : false);
1346 : idxstmt =
1347 1081 : generateClonedIndexStmt(NULL, idxRel,
1348 : attmap, &constraintOid);
1349 1081 : DefineIndex(NULL,
1350 : RelationGetRelid(rel),
1351 : idxstmt,
1352 : InvalidOid,
1353 : RelationGetRelid(idxRel),
1354 : constraintOid,
1355 : -1,
1356 : false, false, false, false, false);
1357 :
1358 1077 : index_close(idxRel, AccessShareLock);
1359 : }
1360 :
1361 6166 : list_free(idxlist);
1362 :
1363 : /*
1364 : * If there are any row-level triggers, clone them to the new
1365 : * partition.
1366 : */
1367 6166 : if (parent->trigdesc != NULL)
1368 260 : CloneRowTriggersToPartition(parent, rel);
1369 :
1370 : /*
1371 : * And foreign keys too. Note that because we're freshly creating the
1372 : * table, there is no need to verify these new constraints.
1373 : */
1374 6166 : CloneForeignKeyConstraints(NULL, parent, rel);
1375 :
1376 6166 : table_close(parent, NoLock);
1377 : }
1378 :
1379 : /*
1380 : * Now add any newly specified CHECK constraints to the new relation. Same
1381 : * as for defaults above, but these need to come after partitioning is set
1382 : * up. We save the constraint names that were used, to avoid dupes below.
1383 : */
1384 40984 : if (stmt->constraints)
1385 : {
1386 : List *conlist;
1387 :
1388 498 : conlist = AddRelationNewConstraints(rel, NIL, stmt->constraints,
1389 : true, true, false, queryString);
1390 1509 : foreach_ptr(CookedConstraint, cons, conlist)
1391 : {
1392 553 : if (cons->name != NULL)
1393 553 : connames = lappend(connames, cons->name);
1394 : }
1395 : }
1396 :
1397 : /*
1398 : * Finally, merge the not-null constraints that are declared directly with
1399 : * those that come from parent relations (making sure to count inheritance
1400 : * appropriately for each), create them, and set the attnotnull flag on
1401 : * columns that don't yet have it.
1402 : */
1403 40964 : nncols = AddRelationNotNullConstraints(rel, stmt->nnconstraints,
1404 : old_notnulls, connames);
1405 92059 : foreach_int(attrnum, nncols)
1406 10235 : set_attnotnull(NULL, rel, attrnum, true, false);
1407 :
1408 40912 : ObjectAddressSet(address, RelationRelationId, relationId);
1409 :
1410 : /*
1411 : * Clean up. We keep lock on new relation (although it shouldn't be
1412 : * visible to anyone else anyway, until commit).
1413 : */
1414 40912 : relation_close(rel, NoLock);
1415 :
1416 40912 : return address;
1417 : }
1418 :
1419 : /*
1420 : * BuildDescForRelation
1421 : *
1422 : * Given a list of ColumnDef nodes, build a TupleDesc.
1423 : *
1424 : * Note: This is only for the limited purpose of table and view creation. Not
1425 : * everything is filled in. A real tuple descriptor should be obtained from
1426 : * the relcache.
1427 : */
1428 : TupleDesc
1429 44168 : BuildDescForRelation(const List *columns)
1430 : {
1431 : int natts;
1432 : AttrNumber attnum;
1433 : ListCell *l;
1434 : TupleDesc desc;
1435 : char *attname;
1436 : Oid atttypid;
1437 : int32 atttypmod;
1438 : Oid attcollation;
1439 : int attdim;
1440 :
1441 : /*
1442 : * allocate a new tuple descriptor
1443 : */
1444 44168 : natts = list_length(columns);
1445 44168 : desc = CreateTemplateTupleDesc(natts);
1446 :
1447 44168 : attnum = 0;
1448 :
1449 214059 : foreach(l, columns)
1450 : {
1451 169931 : ColumnDef *entry = lfirst(l);
1452 : AclResult aclresult;
1453 : Form_pg_attribute att;
1454 :
1455 : /*
1456 : * for each entry in the list, get the name and type information from
1457 : * the list and have TupleDescInitEntry fill in the attribute
1458 : * information we need.
1459 : */
1460 169931 : attnum++;
1461 :
1462 169931 : attname = entry->colname;
1463 169931 : typenameTypeIdAndMod(NULL, entry->typeName, &atttypid, &atttypmod);
1464 :
1465 169931 : aclresult = object_aclcheck(TypeRelationId, atttypid, GetUserId(), ACL_USAGE);
1466 169931 : if (aclresult != ACLCHECK_OK)
1467 28 : aclcheck_error_type(aclresult, atttypid);
1468 :
1469 169903 : attcollation = GetColumnDefCollation(NULL, entry, atttypid);
1470 169903 : attdim = list_length(entry->typeName->arrayBounds);
1471 169903 : if (attdim > PG_INT16_MAX)
1472 0 : ereport(ERROR,
1473 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1474 : errmsg("too many array dimensions"));
1475 :
1476 169903 : if (entry->typeName->setof)
1477 0 : ereport(ERROR,
1478 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1479 : errmsg("column \"%s\" cannot be declared SETOF",
1480 : attname)));
1481 :
1482 169903 : TupleDescInitEntry(desc, attnum, attname,
1483 : atttypid, atttypmod, attdim);
1484 169903 : att = TupleDescAttr(desc, attnum - 1);
1485 :
1486 : /* Override TupleDescInitEntry's settings as requested */
1487 169903 : TupleDescInitEntryCollation(desc, attnum, attcollation);
1488 :
1489 : /* Fill in additional stuff not handled by TupleDescInitEntry */
1490 169903 : att->attnotnull = entry->is_not_null;
1491 169903 : att->attislocal = entry->is_local;
1492 169903 : att->attinhcount = entry->inhcount;
1493 169903 : att->attidentity = entry->identity;
1494 169903 : att->attgenerated = entry->generated;
1495 169903 : att->attcompression = GetAttributeCompression(att->atttypid, entry->compression);
1496 169895 : if (entry->storage)
1497 16713 : att->attstorage = entry->storage;
1498 153182 : else if (entry->storage_name)
1499 39 : att->attstorage = GetAttributeStorage(att->atttypid, entry->storage_name);
1500 :
1501 169891 : populate_compact_attribute(desc, attnum - 1);
1502 : }
1503 :
1504 44128 : TupleDescFinalize(desc);
1505 :
1506 44128 : return desc;
1507 : }
1508 :
1509 : /*
1510 : * Emit the right error or warning message for a "DROP" command issued on a
1511 : * non-existent relation
1512 : */
1513 : static void
1514 625 : DropErrorMsgNonExistent(RangeVar *rel, char rightkind, bool missing_ok)
1515 : {
1516 : const struct dropmsgstrings *rentry;
1517 :
1518 705 : if (rel->schemaname != NULL &&
1519 80 : !OidIsValid(LookupNamespaceNoError(rel->schemaname)))
1520 : {
1521 28 : if (!missing_ok)
1522 : {
1523 0 : ereport(ERROR,
1524 : (errcode(ERRCODE_UNDEFINED_SCHEMA),
1525 : errmsg("schema \"%s\" does not exist", rel->schemaname)));
1526 : }
1527 : else
1528 : {
1529 28 : ereport(NOTICE,
1530 : (errmsg("schema \"%s\" does not exist, skipping",
1531 : rel->schemaname)));
1532 : }
1533 28 : return;
1534 : }
1535 :
1536 882 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1537 : {
1538 882 : if (rentry->kind == rightkind)
1539 : {
1540 597 : if (!missing_ok)
1541 : {
1542 90 : ereport(ERROR,
1543 : (errcode(rentry->nonexistent_code),
1544 : errmsg(rentry->nonexistent_msg, rel->relname)));
1545 : }
1546 : else
1547 : {
1548 507 : ereport(NOTICE, (errmsg(rentry->skipping_msg, rel->relname)));
1549 507 : break;
1550 : }
1551 : }
1552 : }
1553 :
1554 : Assert(rentry->kind != '\0'); /* Should be impossible */
1555 : }
1556 :
1557 : /*
1558 : * Emit the right error message for a "DROP" command issued on a
1559 : * relation of the wrong type
1560 : */
1561 : static void
1562 4 : DropErrorMsgWrongType(const char *relname, char wrongkind, char rightkind)
1563 : {
1564 : const struct dropmsgstrings *rentry;
1565 : const struct dropmsgstrings *wentry;
1566 :
1567 4 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1568 4 : if (rentry->kind == rightkind)
1569 4 : break;
1570 : Assert(rentry->kind != '\0');
1571 :
1572 40 : for (wentry = dropmsgstringarray; wentry->kind != '\0'; wentry++)
1573 40 : if (wentry->kind == wrongkind)
1574 4 : break;
1575 : /* wrongkind could be something we don't have in our table... */
1576 :
1577 4 : ereport(ERROR,
1578 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1579 : errmsg(rentry->nota_msg, relname),
1580 : (wentry->kind != '\0') ? errhint("%s", _(wentry->drophint_msg)) : 0));
1581 : }
1582 :
1583 : /*
1584 : * RemoveRelations
1585 : * Implements DROP TABLE, DROP INDEX, DROP SEQUENCE, DROP VIEW,
1586 : * DROP MATERIALIZED VIEW, DROP FOREIGN TABLE, DROP PROPERTY GRAPH
1587 : */
1588 : void
1589 11656 : RemoveRelations(DropStmt *drop)
1590 : {
1591 : ObjectAddresses *objects;
1592 : char relkind;
1593 : ListCell *cell;
1594 11656 : int flags = 0;
1595 11656 : LOCKMODE lockmode = AccessExclusiveLock;
1596 :
1597 : /* DROP CONCURRENTLY uses a weaker lock, and has some restrictions */
1598 11656 : if (drop->concurrent)
1599 : {
1600 : /*
1601 : * Note that for temporary relations this lock may get upgraded later
1602 : * on, but as no other session can access a temporary relation, this
1603 : * is actually fine.
1604 : */
1605 101 : lockmode = ShareUpdateExclusiveLock;
1606 : Assert(drop->removeType == OBJECT_INDEX);
1607 101 : if (list_length(drop->objects) != 1)
1608 4 : ereport(ERROR,
1609 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1610 : errmsg("DROP INDEX CONCURRENTLY does not support dropping multiple objects")));
1611 97 : if (drop->behavior == DROP_CASCADE)
1612 0 : ereport(ERROR,
1613 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1614 : errmsg("DROP INDEX CONCURRENTLY does not support CASCADE")));
1615 : }
1616 :
1617 : /*
1618 : * First we identify all the relations, then we delete them in a single
1619 : * performMultipleDeletions() call. This is to avoid unwanted DROP
1620 : * RESTRICT errors if one of the relations depends on another.
1621 : */
1622 :
1623 : /* Determine required relkind */
1624 11652 : switch (drop->removeType)
1625 : {
1626 10087 : case OBJECT_TABLE:
1627 10087 : relkind = RELKIND_RELATION;
1628 10087 : break;
1629 :
1630 547 : case OBJECT_INDEX:
1631 547 : relkind = RELKIND_INDEX;
1632 547 : break;
1633 :
1634 119 : case OBJECT_SEQUENCE:
1635 119 : relkind = RELKIND_SEQUENCE;
1636 119 : break;
1637 :
1638 668 : case OBJECT_VIEW:
1639 668 : relkind = RELKIND_VIEW;
1640 668 : break;
1641 :
1642 79 : case OBJECT_MATVIEW:
1643 79 : relkind = RELKIND_MATVIEW;
1644 79 : break;
1645 :
1646 106 : case OBJECT_FOREIGN_TABLE:
1647 106 : relkind = RELKIND_FOREIGN_TABLE;
1648 106 : break;
1649 :
1650 46 : case OBJECT_PROPGRAPH:
1651 46 : relkind = RELKIND_PROPGRAPH;
1652 46 : break;
1653 :
1654 0 : default:
1655 0 : elog(ERROR, "unrecognized drop object type: %d",
1656 : (int) drop->removeType);
1657 : relkind = 0; /* keep compiler quiet */
1658 : break;
1659 : }
1660 :
1661 : /* Lock and validate each relation; build a list of object addresses */
1662 11652 : objects = new_object_addresses();
1663 :
1664 25690 : foreach(cell, drop->objects)
1665 : {
1666 14149 : RangeVar *rel = makeRangeVarFromNameList((List *) lfirst(cell));
1667 : Oid relOid;
1668 : ObjectAddress obj;
1669 : struct DropRelationCallbackState state;
1670 :
1671 : /*
1672 : * These next few steps are a great deal like relation_openrv, but we
1673 : * don't bother building a relcache entry since we don't need it.
1674 : *
1675 : * Check for shared-cache-inval messages before trying to access the
1676 : * relation. This is needed to cover the case where the name
1677 : * identifies a rel that has been dropped and recreated since the
1678 : * start of our transaction: if we don't flush the old syscache entry,
1679 : * then we'll latch onto that entry and suffer an error later.
1680 : */
1681 14149 : AcceptInvalidationMessages();
1682 :
1683 : /* Look up the appropriate relation using namespace search. */
1684 14149 : state.expected_relkind = relkind;
1685 28298 : state.heap_lockmode = drop->concurrent ?
1686 14149 : ShareUpdateExclusiveLock : AccessExclusiveLock;
1687 : /* We must initialize these fields to show that no locks are held: */
1688 14149 : state.heapOid = InvalidOid;
1689 14149 : state.partParentOid = InvalidOid;
1690 :
1691 14149 : relOid = RangeVarGetRelidExtended(rel, lockmode, RVR_MISSING_OK,
1692 : RangeVarCallbackForDropRelation,
1693 : &state);
1694 :
1695 : /* Not there? */
1696 14132 : if (!OidIsValid(relOid))
1697 : {
1698 625 : DropErrorMsgNonExistent(rel, relkind, drop->missing_ok);
1699 535 : continue;
1700 : }
1701 :
1702 : /*
1703 : * Decide if concurrent mode needs to be used here or not. The
1704 : * callback retrieved the rel's persistence for us.
1705 : */
1706 13507 : if (drop->concurrent &&
1707 93 : state.actual_relpersistence != RELPERSISTENCE_TEMP)
1708 : {
1709 : Assert(list_length(drop->objects) == 1 &&
1710 : drop->removeType == OBJECT_INDEX);
1711 81 : flags |= PERFORM_DELETION_CONCURRENTLY;
1712 : }
1713 :
1714 : /*
1715 : * Concurrent index drop cannot be used with partitioned indexes,
1716 : * either.
1717 : */
1718 13507 : if ((flags & PERFORM_DELETION_CONCURRENTLY) != 0 &&
1719 81 : state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1720 4 : ereport(ERROR,
1721 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1722 : errmsg("cannot drop partitioned index \"%s\" concurrently",
1723 : rel->relname)));
1724 :
1725 : /*
1726 : * If we're told to drop a partitioned index, we must acquire lock on
1727 : * all the children of its parent partitioned table before proceeding.
1728 : * Otherwise we'd try to lock the child index partitions before their
1729 : * tables, leading to potential deadlock against other sessions that
1730 : * will lock those objects in the other order.
1731 : */
1732 13503 : if (state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1733 50 : (void) find_all_inheritors(state.heapOid,
1734 : state.heap_lockmode,
1735 : NULL);
1736 :
1737 : /* OK, we're ready to delete this one */
1738 13503 : obj.classId = RelationRelationId;
1739 13503 : obj.objectId = relOid;
1740 13503 : obj.objectSubId = 0;
1741 :
1742 13503 : add_exact_object_address(&obj, objects);
1743 : }
1744 :
1745 11541 : performMultipleDeletions(objects, drop->behavior, flags);
1746 :
1747 11439 : free_object_addresses(objects);
1748 11439 : }
1749 :
1750 : /*
1751 : * Before acquiring a table lock, check whether we have sufficient rights.
1752 : * In the case of DROP INDEX, also try to lock the table before the index.
1753 : * Also, if the table to be dropped is a partition, we try to lock the parent
1754 : * first.
1755 : */
1756 : static void
1757 14356 : RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid, Oid oldRelOid,
1758 : void *arg)
1759 : {
1760 : HeapTuple tuple;
1761 : struct DropRelationCallbackState *state;
1762 : char expected_relkind;
1763 : bool is_partition;
1764 : Form_pg_class classform;
1765 : LOCKMODE heap_lockmode;
1766 14356 : bool invalid_system_index = false;
1767 :
1768 14356 : state = (struct DropRelationCallbackState *) arg;
1769 14356 : heap_lockmode = state->heap_lockmode;
1770 :
1771 : /*
1772 : * If we previously locked some other index's heap, and the name we're
1773 : * looking up no longer refers to that relation, release the now-useless
1774 : * lock.
1775 : */
1776 14356 : if (relOid != oldRelOid && OidIsValid(state->heapOid))
1777 : {
1778 0 : UnlockRelationOid(state->heapOid, heap_lockmode);
1779 0 : state->heapOid = InvalidOid;
1780 : }
1781 :
1782 : /*
1783 : * Similarly, if we previously locked some other partition's heap, and the
1784 : * name we're looking up no longer refers to that relation, release the
1785 : * now-useless lock.
1786 : */
1787 14356 : if (relOid != oldRelOid && OidIsValid(state->partParentOid))
1788 : {
1789 0 : UnlockRelationOid(state->partParentOid, AccessExclusiveLock);
1790 0 : state->partParentOid = InvalidOid;
1791 : }
1792 :
1793 : /* Didn't find a relation, so no need for locking or permission checks. */
1794 14356 : if (!OidIsValid(relOid))
1795 628 : return;
1796 :
1797 13728 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
1798 13728 : if (!HeapTupleIsValid(tuple))
1799 0 : return; /* concurrently dropped, so nothing to do */
1800 13728 : classform = (Form_pg_class) GETSTRUCT(tuple);
1801 13728 : is_partition = classform->relispartition;
1802 :
1803 : /* Pass back some data to save lookups in RemoveRelations */
1804 13728 : state->actual_relkind = classform->relkind;
1805 13728 : state->actual_relpersistence = classform->relpersistence;
1806 :
1807 : /*
1808 : * Both RELKIND_RELATION and RELKIND_PARTITIONED_TABLE are OBJECT_TABLE,
1809 : * but RemoveRelations() can only pass one relkind for a given relation.
1810 : * It chooses RELKIND_RELATION for both regular and partitioned tables.
1811 : * That means we must be careful before giving the wrong type error when
1812 : * the relation is RELKIND_PARTITIONED_TABLE. An equivalent problem
1813 : * exists with indexes.
1814 : */
1815 13728 : if (classform->relkind == RELKIND_PARTITIONED_TABLE)
1816 2189 : expected_relkind = RELKIND_RELATION;
1817 11539 : else if (classform->relkind == RELKIND_PARTITIONED_INDEX)
1818 56 : expected_relkind = RELKIND_INDEX;
1819 : else
1820 11483 : expected_relkind = classform->relkind;
1821 :
1822 13728 : if (state->expected_relkind != expected_relkind)
1823 4 : DropErrorMsgWrongType(rel->relname, classform->relkind,
1824 4 : state->expected_relkind);
1825 :
1826 : /* Allow DROP to either table owner or schema owner */
1827 13724 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()) &&
1828 12 : !object_ownercheck(NamespaceRelationId, classform->relnamespace, GetUserId()))
1829 12 : aclcheck_error(ACLCHECK_NOT_OWNER,
1830 12 : get_relkind_objtype(classform->relkind),
1831 12 : rel->relname);
1832 :
1833 : /*
1834 : * Check the case of a system index that might have been invalidated by a
1835 : * failed concurrent process and allow its drop. For the time being, this
1836 : * only concerns indexes of toast relations that became invalid during a
1837 : * REINDEX CONCURRENTLY process.
1838 : */
1839 13712 : if (IsSystemClass(relOid, classform) && classform->relkind == RELKIND_INDEX)
1840 : {
1841 : HeapTuple locTuple;
1842 : Form_pg_index indexform;
1843 : bool indisvalid;
1844 :
1845 0 : locTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(relOid));
1846 0 : if (!HeapTupleIsValid(locTuple))
1847 : {
1848 0 : ReleaseSysCache(tuple);
1849 0 : return;
1850 : }
1851 :
1852 0 : indexform = (Form_pg_index) GETSTRUCT(locTuple);
1853 0 : indisvalid = indexform->indisvalid;
1854 0 : ReleaseSysCache(locTuple);
1855 :
1856 : /* Mark object as being an invalid index of system catalogs */
1857 0 : if (!indisvalid)
1858 0 : invalid_system_index = true;
1859 : }
1860 :
1861 : /* In the case of an invalid index, it is fine to bypass this check */
1862 13712 : if (!invalid_system_index && !allowSystemTableMods && IsSystemClass(relOid, classform))
1863 1 : ereport(ERROR,
1864 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1865 : errmsg("permission denied: \"%s\" is a system catalog",
1866 : rel->relname)));
1867 :
1868 13711 : ReleaseSysCache(tuple);
1869 :
1870 : /*
1871 : * In DROP INDEX, attempt to acquire lock on the parent table before
1872 : * locking the index. index_drop() will need this anyway, and since
1873 : * regular queries lock tables before their indexes, we risk deadlock if
1874 : * we do it the other way around. No error if we don't find a pg_index
1875 : * entry, though --- the relation may have been dropped. Note that this
1876 : * code will execute for either plain or partitioned indexes.
1877 : */
1878 13711 : if (expected_relkind == RELKIND_INDEX &&
1879 : relOid != oldRelOid)
1880 : {
1881 539 : state->heapOid = IndexGetRelation(relOid, true);
1882 539 : if (OidIsValid(state->heapOid))
1883 539 : LockRelationOid(state->heapOid, heap_lockmode);
1884 : }
1885 :
1886 : /*
1887 : * Similarly, if the relation is a partition, we must acquire lock on its
1888 : * parent before locking the partition. That's because queries lock the
1889 : * parent before its partitions, so we risk deadlock if we do it the other
1890 : * way around.
1891 : */
1892 13711 : if (is_partition && relOid != oldRelOid)
1893 : {
1894 397 : state->partParentOid = get_partition_parent(relOid, true);
1895 397 : if (OidIsValid(state->partParentOid))
1896 397 : LockRelationOid(state->partParentOid, AccessExclusiveLock);
1897 : }
1898 : }
1899 :
1900 : /*
1901 : * ExecuteTruncate
1902 : * Executes a TRUNCATE command.
1903 : *
1904 : * This is a multi-relation truncate. We first open and grab exclusive
1905 : * lock on all relations involved, checking permissions and otherwise
1906 : * verifying that the relation is OK for truncation. Note that if relations
1907 : * are foreign tables, at this stage, we have not yet checked that their
1908 : * foreign data in external data sources are OK for truncation. These are
1909 : * checked when foreign data are actually truncated later. In CASCADE mode,
1910 : * relations having FK references to the targeted relations are automatically
1911 : * added to the group; in RESTRICT mode, we check that all FK references are
1912 : * internal to the group that's being truncated. Finally all the relations
1913 : * are truncated and reindexed.
1914 : */
1915 : void
1916 1148 : ExecuteTruncate(TruncateStmt *stmt)
1917 : {
1918 1148 : List *rels = NIL;
1919 1148 : List *relids = NIL;
1920 1148 : List *relids_logged = NIL;
1921 : ListCell *cell;
1922 :
1923 : /*
1924 : * Open, exclusive-lock, and check all the explicitly-specified relations
1925 : */
1926 2445 : foreach(cell, stmt->relations)
1927 : {
1928 1332 : RangeVar *rv = lfirst(cell);
1929 : Relation rel;
1930 1332 : bool recurse = rv->inh;
1931 : Oid myrelid;
1932 1332 : LOCKMODE lockmode = AccessExclusiveLock;
1933 :
1934 1332 : myrelid = RangeVarGetRelidExtended(rv, lockmode,
1935 : 0, RangeVarCallbackForTruncate,
1936 : NULL);
1937 :
1938 : /* don't throw error for "TRUNCATE foo, foo" */
1939 1309 : if (list_member_oid(relids, myrelid))
1940 1 : continue;
1941 :
1942 : /* open the relation, we already hold a lock on it */
1943 1308 : rel = table_open(myrelid, NoLock);
1944 :
1945 : /*
1946 : * RangeVarGetRelidExtended() has done most checks with its callback,
1947 : * but other checks with the now-opened Relation remain.
1948 : */
1949 1308 : truncate_check_activity(rel);
1950 :
1951 1304 : rels = lappend(rels, rel);
1952 1304 : relids = lappend_oid(relids, myrelid);
1953 :
1954 : /* Log this relation only if needed for logical decoding */
1955 1304 : if (RelationIsLogicallyLogged(rel))
1956 39 : relids_logged = lappend_oid(relids_logged, myrelid);
1957 :
1958 1304 : if (recurse)
1959 : {
1960 : ListCell *child;
1961 : List *children;
1962 :
1963 1271 : children = find_all_inheritors(myrelid, lockmode, NULL);
1964 :
1965 3762 : foreach(child, children)
1966 : {
1967 2491 : Oid childrelid = lfirst_oid(child);
1968 :
1969 2491 : if (list_member_oid(relids, childrelid))
1970 1271 : continue;
1971 :
1972 : /* find_all_inheritors already got lock */
1973 1220 : rel = table_open(childrelid, NoLock);
1974 :
1975 : /*
1976 : * It is possible that the parent table has children that are
1977 : * temp tables of other backends. We cannot safely access
1978 : * such tables (because of buffering issues), and the best
1979 : * thing to do is to silently ignore them. Note that this
1980 : * check is the same as one of the checks done in
1981 : * truncate_check_activity() called below, still it is kept
1982 : * here for simplicity.
1983 : */
1984 1220 : if (RELATION_IS_OTHER_TEMP(rel))
1985 : {
1986 4 : table_close(rel, lockmode);
1987 4 : continue;
1988 : }
1989 :
1990 : /*
1991 : * Inherited TRUNCATE commands perform access permission
1992 : * checks on the parent table only. So we skip checking the
1993 : * children's permissions and don't call
1994 : * truncate_check_perms() here.
1995 : */
1996 1216 : truncate_check_rel(RelationGetRelid(rel), rel->rd_rel);
1997 1216 : truncate_check_activity(rel);
1998 :
1999 1216 : rels = lappend(rels, rel);
2000 1216 : relids = lappend_oid(relids, childrelid);
2001 :
2002 : /* Log this relation only if needed for logical decoding */
2003 1216 : if (RelationIsLogicallyLogged(rel))
2004 11 : relids_logged = lappend_oid(relids_logged, childrelid);
2005 : }
2006 : }
2007 33 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2008 8 : ereport(ERROR,
2009 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2010 : errmsg("cannot truncate only a partitioned table"),
2011 : errhint("Do not specify the ONLY keyword, or use TRUNCATE ONLY on the partitions directly.")));
2012 : }
2013 :
2014 1113 : ExecuteTruncateGuts(rels, relids, relids_logged,
2015 1113 : stmt->behavior, stmt->restart_seqs, false);
2016 :
2017 : /* And close the rels */
2018 3471 : foreach(cell, rels)
2019 : {
2020 2411 : Relation rel = (Relation) lfirst(cell);
2021 :
2022 2411 : table_close(rel, NoLock);
2023 : }
2024 1060 : }
2025 :
2026 : /*
2027 : * ExecuteTruncateGuts
2028 : *
2029 : * Internal implementation of TRUNCATE. This is called by the actual TRUNCATE
2030 : * command (see above) as well as replication subscribers that execute a
2031 : * replicated TRUNCATE action.
2032 : *
2033 : * explicit_rels is the list of Relations to truncate that the command
2034 : * specified. relids is the list of Oids corresponding to explicit_rels.
2035 : * relids_logged is the list of Oids (a subset of relids) that require
2036 : * WAL-logging. This is all a bit redundant, but the existing callers have
2037 : * this information handy in this form.
2038 : */
2039 : void
2040 1133 : ExecuteTruncateGuts(List *explicit_rels,
2041 : List *relids,
2042 : List *relids_logged,
2043 : DropBehavior behavior, bool restart_seqs,
2044 : bool run_as_table_owner)
2045 : {
2046 : List *rels;
2047 1133 : List *seq_relids = NIL;
2048 1133 : HTAB *ft_htab = NULL;
2049 : EState *estate;
2050 : ResultRelInfo *resultRelInfos;
2051 : ResultRelInfo *resultRelInfo;
2052 : SubTransactionId mySubid;
2053 : ListCell *cell;
2054 : Oid *logrelids;
2055 :
2056 : /*
2057 : * Check the explicitly-specified relations.
2058 : *
2059 : * In CASCADE mode, suck in all referencing relations as well. This
2060 : * requires multiple iterations to find indirectly-dependent relations. At
2061 : * each phase, we need to exclusive-lock new rels before looking for their
2062 : * dependencies, else we might miss something. Also, we check each rel as
2063 : * soon as we open it, to avoid a faux pas such as holding lock for a long
2064 : * time on a rel we have no permissions for.
2065 : */
2066 1133 : rels = list_copy(explicit_rels);
2067 1133 : if (behavior == DROP_CASCADE)
2068 : {
2069 : for (;;)
2070 26 : {
2071 : List *newrelids;
2072 :
2073 51 : newrelids = heap_truncate_find_FKs(relids);
2074 51 : if (newrelids == NIL)
2075 25 : break; /* nothing else to add */
2076 :
2077 88 : foreach(cell, newrelids)
2078 : {
2079 62 : Oid relid = lfirst_oid(cell);
2080 : Relation rel;
2081 :
2082 62 : rel = table_open(relid, AccessExclusiveLock);
2083 62 : ereport(NOTICE,
2084 : (errmsg("truncate cascades to table \"%s\"",
2085 : RelationGetRelationName(rel))));
2086 62 : truncate_check_rel(relid, rel->rd_rel);
2087 62 : truncate_check_perms(relid, rel->rd_rel);
2088 62 : truncate_check_activity(rel);
2089 62 : rels = lappend(rels, rel);
2090 62 : relids = lappend_oid(relids, relid);
2091 :
2092 : /* Log this relation only if needed for logical decoding */
2093 62 : if (RelationIsLogicallyLogged(rel))
2094 0 : relids_logged = lappend_oid(relids_logged, relid);
2095 : }
2096 : }
2097 : }
2098 :
2099 : /*
2100 : * Check foreign key references. In CASCADE mode, this should be
2101 : * unnecessary since we just pulled in all the references; but as a
2102 : * cross-check, do it anyway if in an Assert-enabled build.
2103 : */
2104 : #ifdef USE_ASSERT_CHECKING
2105 : heap_truncate_check_FKs(rels, false);
2106 : #else
2107 1133 : if (behavior == DROP_RESTRICT)
2108 1108 : heap_truncate_check_FKs(rels, false);
2109 : #endif
2110 :
2111 : /*
2112 : * If we are asked to restart sequences, find all the sequences, lock them
2113 : * (we need AccessExclusiveLock for ResetSequence), and check permissions.
2114 : * We want to do this early since it's pointless to do all the truncation
2115 : * work only to fail on sequence permissions.
2116 : */
2117 1084 : if (restart_seqs)
2118 : {
2119 32 : foreach(cell, rels)
2120 : {
2121 16 : Relation rel = (Relation) lfirst(cell);
2122 16 : List *seqlist = getOwnedSequences(RelationGetRelid(rel));
2123 : ListCell *seqcell;
2124 :
2125 39 : foreach(seqcell, seqlist)
2126 : {
2127 23 : Oid seq_relid = lfirst_oid(seqcell);
2128 : Relation seq_rel;
2129 :
2130 23 : seq_rel = relation_open(seq_relid, AccessExclusiveLock);
2131 :
2132 : /* This check must match AlterSequence! */
2133 23 : if (!object_ownercheck(RelationRelationId, seq_relid, GetUserId()))
2134 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SEQUENCE,
2135 0 : RelationGetRelationName(seq_rel));
2136 :
2137 23 : seq_relids = lappend_oid(seq_relids, seq_relid);
2138 :
2139 23 : relation_close(seq_rel, NoLock);
2140 : }
2141 : }
2142 : }
2143 :
2144 : /* Prepare to catch AFTER triggers. */
2145 1084 : AfterTriggerBeginQuery();
2146 :
2147 : /*
2148 : * To fire triggers, we'll need an EState as well as a ResultRelInfo for
2149 : * each relation. We don't need to call ExecOpenIndices, though.
2150 : *
2151 : * We put the ResultRelInfos in the es_opened_result_relations list, even
2152 : * though we don't have a range table and don't populate the
2153 : * es_result_relations array. That's a bit bogus, but it's enough to make
2154 : * ExecGetTriggerResultRel() find them.
2155 : */
2156 1084 : estate = CreateExecutorState();
2157 : resultRelInfos = (ResultRelInfo *)
2158 1084 : palloc(list_length(rels) * sizeof(ResultRelInfo));
2159 1084 : resultRelInfo = resultRelInfos;
2160 3597 : foreach(cell, rels)
2161 : {
2162 2513 : Relation rel = (Relation) lfirst(cell);
2163 :
2164 2513 : InitResultRelInfo(resultRelInfo,
2165 : rel,
2166 : 0, /* dummy rangetable index */
2167 : NULL,
2168 : 0);
2169 2513 : estate->es_opened_result_relations =
2170 2513 : lappend(estate->es_opened_result_relations, resultRelInfo);
2171 2513 : resultRelInfo++;
2172 : }
2173 :
2174 : /*
2175 : * Process all BEFORE STATEMENT TRUNCATE triggers before we begin
2176 : * truncating (this is because one of them might throw an error). Also, if
2177 : * we were to allow them to prevent statement execution, that would need
2178 : * to be handled here.
2179 : */
2180 1084 : resultRelInfo = resultRelInfos;
2181 3597 : foreach(cell, rels)
2182 : {
2183 : UserContext ucxt;
2184 :
2185 2513 : if (run_as_table_owner)
2186 36 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2187 : &ucxt);
2188 2513 : ExecBSTruncateTriggers(estate, resultRelInfo);
2189 2513 : if (run_as_table_owner)
2190 36 : RestoreUserContext(&ucxt);
2191 2513 : resultRelInfo++;
2192 : }
2193 :
2194 : /*
2195 : * OK, truncate each table.
2196 : */
2197 1084 : mySubid = GetCurrentSubTransactionId();
2198 :
2199 3597 : foreach(cell, rels)
2200 : {
2201 2513 : Relation rel = (Relation) lfirst(cell);
2202 :
2203 : /* Skip partitioned tables as there is nothing to do */
2204 2513 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2205 477 : continue;
2206 :
2207 : /*
2208 : * Build the lists of foreign tables belonging to each foreign server
2209 : * and pass each list to the foreign data wrapper's callback function,
2210 : * so that each server can truncate its all foreign tables in bulk.
2211 : * Each list is saved as a single entry in a hash table that uses the
2212 : * server OID as lookup key.
2213 : */
2214 2036 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
2215 17 : {
2216 17 : Oid serverid = GetForeignServerIdByRelId(RelationGetRelid(rel));
2217 : bool found;
2218 : ForeignTruncateInfo *ft_info;
2219 :
2220 : /* First time through, initialize hashtable for foreign tables */
2221 17 : if (!ft_htab)
2222 : {
2223 : HASHCTL hctl;
2224 :
2225 15 : memset(&hctl, 0, sizeof(HASHCTL));
2226 15 : hctl.keysize = sizeof(Oid);
2227 15 : hctl.entrysize = sizeof(ForeignTruncateInfo);
2228 15 : hctl.hcxt = CurrentMemoryContext;
2229 :
2230 15 : ft_htab = hash_create("TRUNCATE for Foreign Tables",
2231 : 32, /* start small and extend */
2232 : &hctl,
2233 : HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
2234 : }
2235 :
2236 : /* Find or create cached entry for the foreign table */
2237 17 : ft_info = hash_search(ft_htab, &serverid, HASH_ENTER, &found);
2238 17 : if (!found)
2239 15 : ft_info->rels = NIL;
2240 :
2241 : /*
2242 : * Save the foreign table in the entry of the server that the
2243 : * foreign table belongs to.
2244 : */
2245 17 : ft_info->rels = lappend(ft_info->rels, rel);
2246 17 : continue;
2247 : }
2248 :
2249 : /*
2250 : * Normally, we need a transaction-safe truncation here. However, if
2251 : * the table was either created in the current (sub)transaction or has
2252 : * a new relfilenumber in the current (sub)transaction, then we can
2253 : * just truncate it in-place, because a rollback would cause the whole
2254 : * table or the current physical file to be thrown away anyway.
2255 : */
2256 2019 : if (rel->rd_createSubid == mySubid ||
2257 2003 : rel->rd_newRelfilelocatorSubid == mySubid)
2258 : {
2259 : /* Immediate, non-rollbackable truncation is OK */
2260 48 : heap_truncate_one_rel(rel);
2261 : }
2262 : else
2263 : {
2264 : Oid heap_relid;
2265 : Oid toast_relid;
2266 1971 : ReindexParams reindex_params = {0};
2267 :
2268 : /*
2269 : * This effectively deletes all rows in the table, and may be done
2270 : * in a serializable transaction. In that case we must record a
2271 : * rw-conflict in to this transaction from each transaction
2272 : * holding a predicate lock on the table.
2273 : */
2274 1971 : CheckTableForSerializableConflictIn(rel);
2275 :
2276 : /*
2277 : * Need the full transaction-safe pushups.
2278 : *
2279 : * Create a new empty storage file for the relation, and assign it
2280 : * as the relfilenumber value. The old storage file is scheduled
2281 : * for deletion at commit.
2282 : */
2283 1971 : RelationSetNewRelfilenumber(rel, rel->rd_rel->relpersistence);
2284 :
2285 1971 : heap_relid = RelationGetRelid(rel);
2286 :
2287 : /*
2288 : * The same for the toast table, if any.
2289 : */
2290 1971 : toast_relid = rel->rd_rel->reltoastrelid;
2291 1971 : if (OidIsValid(toast_relid))
2292 : {
2293 1193 : Relation toastrel = relation_open(toast_relid,
2294 : AccessExclusiveLock);
2295 :
2296 1193 : RelationSetNewRelfilenumber(toastrel,
2297 1193 : toastrel->rd_rel->relpersistence);
2298 1193 : table_close(toastrel, NoLock);
2299 : }
2300 :
2301 : /*
2302 : * Reconstruct the indexes to match, and we're done.
2303 : */
2304 1971 : reindex_relation(NULL, heap_relid, REINDEX_REL_PROCESS_TOAST,
2305 : &reindex_params);
2306 : }
2307 :
2308 2019 : pgstat_count_truncate(rel);
2309 : }
2310 :
2311 : /* Now go through the hash table, and truncate foreign tables */
2312 1084 : if (ft_htab)
2313 : {
2314 : ForeignTruncateInfo *ft_info;
2315 : HASH_SEQ_STATUS seq;
2316 :
2317 15 : hash_seq_init(&seq, ft_htab);
2318 :
2319 15 : PG_TRY();
2320 : {
2321 26 : while ((ft_info = hash_seq_search(&seq)) != NULL)
2322 : {
2323 15 : FdwRoutine *routine = GetFdwRoutineByServerId(ft_info->serverid);
2324 :
2325 : /* truncate_check_rel() has checked that already */
2326 : Assert(routine->ExecForeignTruncate != NULL);
2327 :
2328 15 : routine->ExecForeignTruncate(ft_info->rels,
2329 : behavior,
2330 : restart_seqs);
2331 : }
2332 : }
2333 4 : PG_FINALLY();
2334 : {
2335 15 : hash_destroy(ft_htab);
2336 : }
2337 15 : PG_END_TRY();
2338 : }
2339 :
2340 : /*
2341 : * Restart owned sequences if we were asked to.
2342 : */
2343 1103 : foreach(cell, seq_relids)
2344 : {
2345 23 : Oid seq_relid = lfirst_oid(cell);
2346 :
2347 23 : ResetSequence(seq_relid);
2348 : }
2349 :
2350 : /*
2351 : * Write a WAL record to allow this set of actions to be logically
2352 : * decoded.
2353 : *
2354 : * Assemble an array of relids so we can write a single WAL record for the
2355 : * whole action.
2356 : */
2357 1080 : if (relids_logged != NIL)
2358 : {
2359 : xl_heap_truncate xlrec;
2360 33 : int i = 0;
2361 :
2362 : /* should only get here if effective_wal_level is 'logical' */
2363 : Assert(XLogLogicalInfoActive());
2364 :
2365 33 : logrelids = palloc(list_length(relids_logged) * sizeof(Oid));
2366 84 : foreach(cell, relids_logged)
2367 51 : logrelids[i++] = lfirst_oid(cell);
2368 :
2369 33 : xlrec.dbId = MyDatabaseId;
2370 33 : xlrec.nrelids = list_length(relids_logged);
2371 33 : xlrec.flags = 0;
2372 33 : if (behavior == DROP_CASCADE)
2373 1 : xlrec.flags |= XLH_TRUNCATE_CASCADE;
2374 33 : if (restart_seqs)
2375 2 : xlrec.flags |= XLH_TRUNCATE_RESTART_SEQS;
2376 :
2377 33 : XLogBeginInsert();
2378 33 : XLogRegisterData(&xlrec, SizeOfHeapTruncate);
2379 33 : XLogRegisterData(logrelids, list_length(relids_logged) * sizeof(Oid));
2380 :
2381 33 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
2382 :
2383 33 : (void) XLogInsert(RM_HEAP_ID, XLOG_HEAP_TRUNCATE);
2384 : }
2385 :
2386 : /*
2387 : * Process all AFTER STATEMENT TRUNCATE triggers.
2388 : */
2389 1080 : resultRelInfo = resultRelInfos;
2390 3589 : foreach(cell, rels)
2391 : {
2392 : UserContext ucxt;
2393 :
2394 2509 : if (run_as_table_owner)
2395 36 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2396 : &ucxt);
2397 2509 : ExecASTruncateTriggers(estate, resultRelInfo);
2398 2509 : if (run_as_table_owner)
2399 36 : RestoreUserContext(&ucxt);
2400 2509 : resultRelInfo++;
2401 : }
2402 :
2403 : /* Handle queued AFTER triggers */
2404 1080 : AfterTriggerEndQuery(estate);
2405 :
2406 : /* We can clean up the EState now */
2407 1080 : FreeExecutorState(estate);
2408 :
2409 : /*
2410 : * Close any rels opened by CASCADE (can't do this while EState still
2411 : * holds refs)
2412 : */
2413 1080 : rels = list_difference_ptr(rels, explicit_rels);
2414 1142 : foreach(cell, rels)
2415 : {
2416 62 : Relation rel = (Relation) lfirst(cell);
2417 :
2418 62 : table_close(rel, NoLock);
2419 : }
2420 1080 : }
2421 :
2422 : /*
2423 : * Check that a given relation is safe to truncate. Subroutine for
2424 : * ExecuteTruncate() and RangeVarCallbackForTruncate().
2425 : */
2426 : static void
2427 2690 : truncate_check_rel(Oid relid, Form_pg_class reltuple)
2428 : {
2429 2690 : char *relname = NameStr(reltuple->relname);
2430 :
2431 : /*
2432 : * Only allow truncate on regular tables, foreign tables using foreign
2433 : * data wrappers supporting TRUNCATE and partitioned tables (although, the
2434 : * latter are only being included here for the following checks; no
2435 : * physical truncation will occur in their case.).
2436 : */
2437 2690 : if (reltuple->relkind == RELKIND_FOREIGN_TABLE)
2438 : {
2439 19 : Oid serverid = GetForeignServerIdByRelId(relid);
2440 19 : FdwRoutine *fdwroutine = GetFdwRoutineByServerId(serverid);
2441 :
2442 18 : if (!fdwroutine->ExecForeignTruncate)
2443 1 : ereport(ERROR,
2444 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2445 : errmsg("cannot truncate foreign table \"%s\"",
2446 : relname)));
2447 : }
2448 2671 : else if (reltuple->relkind != RELKIND_RELATION &&
2449 486 : reltuple->relkind != RELKIND_PARTITIONED_TABLE)
2450 0 : ereport(ERROR,
2451 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2452 : errmsg("\"%s\" is not a table", relname)));
2453 :
2454 : /*
2455 : * Most system catalogs can't be truncated at all, or at least not unless
2456 : * allow_system_table_mods=on. As an exception, however, we allow
2457 : * pg_largeobject and pg_largeobject_metadata to be truncated as part of
2458 : * pg_upgrade, because we need to change its relfilenode to match the old
2459 : * cluster, and allowing a TRUNCATE command to be executed is the easiest
2460 : * way of doing that.
2461 : */
2462 2688 : if (!allowSystemTableMods && IsSystemClass(relid, reltuple)
2463 65 : && (!IsBinaryUpgrade ||
2464 32 : (relid != LargeObjectRelationId &&
2465 : relid != LargeObjectMetadataRelationId)))
2466 1 : ereport(ERROR,
2467 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
2468 : errmsg("permission denied: \"%s\" is a system catalog",
2469 : relname)));
2470 :
2471 2687 : InvokeObjectTruncateHook(relid);
2472 2687 : }
2473 :
2474 : /*
2475 : * Check that current user has the permission to truncate given relation.
2476 : */
2477 : static void
2478 1471 : truncate_check_perms(Oid relid, Form_pg_class reltuple)
2479 : {
2480 1471 : char *relname = NameStr(reltuple->relname);
2481 : AclResult aclresult;
2482 :
2483 : /* Permissions checks */
2484 1471 : aclresult = pg_class_aclcheck(relid, GetUserId(), ACL_TRUNCATE);
2485 1471 : if (aclresult != ACLCHECK_OK)
2486 20 : aclcheck_error(aclresult, get_relkind_objtype(reltuple->relkind),
2487 : relname);
2488 1451 : }
2489 :
2490 : /*
2491 : * Set of extra sanity checks to check if a given relation is safe to
2492 : * truncate. This is split with truncate_check_rel() as
2493 : * RangeVarCallbackForTruncate() cannot open a Relation yet.
2494 : */
2495 : static void
2496 2586 : truncate_check_activity(Relation rel)
2497 : {
2498 : /*
2499 : * Don't allow truncate on temp tables of other backends ... their local
2500 : * buffer manager is not going to cope.
2501 : */
2502 2586 : if (RELATION_IS_OTHER_TEMP(rel))
2503 0 : ereport(ERROR,
2504 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2505 : errmsg("cannot truncate temporary tables of other sessions")));
2506 :
2507 : /*
2508 : * Also check for active uses of the relation in the current transaction,
2509 : * including open scans and pending AFTER trigger events.
2510 : */
2511 2586 : CheckTableNotInUse(rel, "TRUNCATE");
2512 2582 : }
2513 :
2514 : /*
2515 : * storage_name
2516 : * returns the name corresponding to a typstorage/attstorage enum value
2517 : */
2518 : static const char *
2519 16 : storage_name(char c)
2520 : {
2521 16 : switch (c)
2522 : {
2523 0 : case TYPSTORAGE_PLAIN:
2524 0 : return "PLAIN";
2525 0 : case TYPSTORAGE_EXTERNAL:
2526 0 : return "EXTERNAL";
2527 8 : case TYPSTORAGE_EXTENDED:
2528 8 : return "EXTENDED";
2529 8 : case TYPSTORAGE_MAIN:
2530 8 : return "MAIN";
2531 0 : default:
2532 0 : return "???";
2533 : }
2534 : }
2535 :
2536 : /*----------
2537 : * MergeAttributes
2538 : * Returns new schema given initial schema and superclasses.
2539 : *
2540 : * Input arguments:
2541 : * 'columns' is the column/attribute definition for the table. (It's a list
2542 : * of ColumnDef's.) It is destructively changed.
2543 : * 'supers' is a list of OIDs of parent relations, already locked by caller.
2544 : * 'relpersistence' is the persistence type of the table.
2545 : * 'is_partition' tells if the table is a partition.
2546 : *
2547 : * Output arguments:
2548 : * 'supconstr' receives a list of CookedConstraint representing
2549 : * CHECK constraints belonging to parent relations, updated as
2550 : * necessary to be valid for the child.
2551 : * 'supnotnulls' receives a list of CookedConstraint representing
2552 : * not-null constraints based on those from parent relations.
2553 : *
2554 : * Return value:
2555 : * Completed schema list.
2556 : *
2557 : * Notes:
2558 : * The order in which the attributes are inherited is very important.
2559 : * Intuitively, the inherited attributes should come first. If a table
2560 : * inherits from multiple parents, the order of those attributes are
2561 : * according to the order of the parents specified in CREATE TABLE.
2562 : *
2563 : * Here's an example:
2564 : *
2565 : * create table person (name text, age int4, location point);
2566 : * create table emp (salary int4, manager text) inherits(person);
2567 : * create table student (gpa float8) inherits (person);
2568 : * create table stud_emp (percent int4) inherits (emp, student);
2569 : *
2570 : * The order of the attributes of stud_emp is:
2571 : *
2572 : * person {1:name, 2:age, 3:location}
2573 : * / \
2574 : * {6:gpa} student emp {4:salary, 5:manager}
2575 : * \ /
2576 : * stud_emp {7:percent}
2577 : *
2578 : * If the same attribute name appears multiple times, then it appears
2579 : * in the result table in the proper location for its first appearance.
2580 : *
2581 : * Constraints (including not-null constraints) for the child table
2582 : * are the union of all relevant constraints, from both the child schema
2583 : * and parent tables. In addition, in legacy inheritance, each column that
2584 : * appears in a primary key in any of the parents also gets a NOT NULL
2585 : * constraint (partitioning doesn't need this, because the PK itself gets
2586 : * inherited.)
2587 : *
2588 : * The default value for a child column is defined as:
2589 : * (1) If the child schema specifies a default, that value is used.
2590 : * (2) If neither the child nor any parent specifies a default, then
2591 : * the column will not have a default.
2592 : * (3) If conflicting defaults are inherited from different parents
2593 : * (and not overridden by the child), an error is raised.
2594 : * (4) Otherwise the inherited default is used.
2595 : *
2596 : * Note that the default-value infrastructure is used for generated
2597 : * columns' expressions too, so most of the preceding paragraph applies
2598 : * to generation expressions too. We insist that a child column be
2599 : * generated if and only if its parent(s) are, but it need not have
2600 : * the same generation expression.
2601 : *----------
2602 : */
2603 : static List *
2604 41707 : MergeAttributes(List *columns, const List *supers, char relpersistence,
2605 : bool is_partition, List **supconstr, List **supnotnulls)
2606 : {
2607 41707 : List *inh_columns = NIL;
2608 41707 : List *constraints = NIL;
2609 41707 : List *nnconstraints = NIL;
2610 41707 : bool have_bogus_defaults = false;
2611 : int child_attno;
2612 : static Node bogus_marker = {0}; /* marks conflicting defaults */
2613 41707 : List *saved_columns = NIL;
2614 : ListCell *lc;
2615 :
2616 : /*
2617 : * Check for and reject tables with too many columns. We perform this
2618 : * check relatively early for two reasons: (a) we don't run the risk of
2619 : * overflowing an AttrNumber in subsequent code (b) an O(n^2) algorithm is
2620 : * okay if we're processing <= 1600 columns, but could take minutes to
2621 : * execute if the user attempts to create a table with hundreds of
2622 : * thousands of columns.
2623 : *
2624 : * Note that we also need to check that we do not exceed this figure after
2625 : * including columns from inherited relations.
2626 : */
2627 41707 : if (list_length(columns) > MaxHeapAttributeNumber)
2628 0 : ereport(ERROR,
2629 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
2630 : errmsg("tables can have at most %d columns",
2631 : MaxHeapAttributeNumber)));
2632 :
2633 : /*
2634 : * Check for duplicate names in the explicit list of attributes.
2635 : *
2636 : * Although we might consider merging such entries in the same way that we
2637 : * handle name conflicts for inherited attributes, it seems to make more
2638 : * sense to assume such conflicts are errors.
2639 : *
2640 : * We don't use foreach() here because we have two nested loops over the
2641 : * columns list, with possible element deletions in the inner one. If we
2642 : * used foreach_delete_current() it could only fix up the state of one of
2643 : * the loops, so it seems cleaner to use looping over list indexes for
2644 : * both loops. Note that any deletion will happen beyond where the outer
2645 : * loop is, so its index never needs adjustment.
2646 : */
2647 193072 : for (int coldefpos = 0; coldefpos < list_length(columns); coldefpos++)
2648 : {
2649 151381 : ColumnDef *coldef = list_nth_node(ColumnDef, columns, coldefpos);
2650 :
2651 151381 : if (!is_partition && coldef->typeName == NULL)
2652 : {
2653 : /*
2654 : * Typed table column option that does not belong to a column from
2655 : * the type. This works because the columns from the type come
2656 : * first in the list. (We omit this check for partition column
2657 : * lists; those are processed separately below.)
2658 : */
2659 4 : ereport(ERROR,
2660 : (errcode(ERRCODE_UNDEFINED_COLUMN),
2661 : errmsg("column \"%s\" does not exist",
2662 : coldef->colname)));
2663 : }
2664 :
2665 : /* restpos scans all entries beyond coldef; incr is in loop body */
2666 4107487 : for (int restpos = coldefpos + 1; restpos < list_length(columns);)
2667 : {
2668 3956122 : ColumnDef *restdef = list_nth_node(ColumnDef, columns, restpos);
2669 :
2670 3956122 : if (strcmp(coldef->colname, restdef->colname) == 0)
2671 : {
2672 33 : if (coldef->is_from_type)
2673 : {
2674 : /*
2675 : * merge the column options into the column from the type
2676 : */
2677 21 : coldef->is_not_null = restdef->is_not_null;
2678 21 : coldef->raw_default = restdef->raw_default;
2679 21 : coldef->cooked_default = restdef->cooked_default;
2680 21 : coldef->constraints = restdef->constraints;
2681 21 : coldef->is_from_type = false;
2682 21 : columns = list_delete_nth_cell(columns, restpos);
2683 : }
2684 : else
2685 12 : ereport(ERROR,
2686 : (errcode(ERRCODE_DUPLICATE_COLUMN),
2687 : errmsg("column \"%s\" specified more than once",
2688 : coldef->colname)));
2689 : }
2690 : else
2691 3956089 : restpos++;
2692 : }
2693 : }
2694 :
2695 : /*
2696 : * In case of a partition, there are no new column definitions, only dummy
2697 : * ColumnDefs created for column constraints. Set them aside for now and
2698 : * process them at the end.
2699 : */
2700 41691 : if (is_partition)
2701 : {
2702 6462 : saved_columns = columns;
2703 6462 : columns = NIL;
2704 : }
2705 :
2706 : /*
2707 : * Scan the parents left-to-right, and merge their attributes to form a
2708 : * list of inherited columns (inh_columns).
2709 : */
2710 41691 : child_attno = 0;
2711 49726 : foreach(lc, supers)
2712 : {
2713 8091 : Oid parent = lfirst_oid(lc);
2714 : Relation relation;
2715 : TupleDesc tupleDesc;
2716 : TupleConstr *constr;
2717 : AttrMap *newattmap;
2718 : List *inherited_defaults;
2719 : List *cols_with_defaults;
2720 : List *nnconstrs;
2721 : ListCell *lc1;
2722 : ListCell *lc2;
2723 8091 : Bitmapset *nncols = NULL;
2724 :
2725 : /* caller already got lock */
2726 8091 : relation = table_open(parent, NoLock);
2727 :
2728 : /*
2729 : * Check for active uses of the parent partitioned table in the
2730 : * current transaction, such as being used in some manner by an
2731 : * enclosing command.
2732 : */
2733 8091 : if (is_partition)
2734 6462 : CheckTableNotInUse(relation, "CREATE TABLE .. PARTITION OF");
2735 :
2736 : /*
2737 : * We do not allow partitioned tables and partitions to participate in
2738 : * regular inheritance.
2739 : */
2740 8087 : if (relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !is_partition)
2741 4 : ereport(ERROR,
2742 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2743 : errmsg("cannot inherit from partitioned table \"%s\"",
2744 : RelationGetRelationName(relation))));
2745 8083 : if (relation->rd_rel->relispartition && !is_partition)
2746 4 : ereport(ERROR,
2747 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2748 : errmsg("cannot inherit from partition \"%s\"",
2749 : RelationGetRelationName(relation))));
2750 :
2751 8079 : if (relation->rd_rel->relkind != RELKIND_RELATION &&
2752 6458 : relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2753 6446 : relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2754 0 : ereport(ERROR,
2755 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2756 : errmsg("inherited relation \"%s\" is not a table or foreign table",
2757 : RelationGetRelationName(relation))));
2758 :
2759 : /*
2760 : * If the parent is permanent, so must be all of its partitions. Note
2761 : * that inheritance allows that case.
2762 : */
2763 8079 : if (is_partition &&
2764 6458 : relation->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
2765 : relpersistence == RELPERSISTENCE_TEMP)
2766 4 : ereport(ERROR,
2767 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2768 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
2769 : RelationGetRelationName(relation))));
2770 :
2771 : /* Permanent rels cannot inherit from temporary ones */
2772 8075 : if (relpersistence != RELPERSISTENCE_TEMP &&
2773 7805 : relation->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
2774 16 : ereport(ERROR,
2775 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2776 : errmsg(!is_partition
2777 : ? "cannot inherit from temporary relation \"%s\""
2778 : : "cannot create a permanent relation as partition of temporary relation \"%s\"",
2779 : RelationGetRelationName(relation))));
2780 :
2781 : /* If existing rel is temp, it must belong to this session */
2782 8059 : if (RELATION_IS_OTHER_TEMP(relation))
2783 0 : ereport(ERROR,
2784 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2785 : errmsg(!is_partition
2786 : ? "cannot inherit from temporary relation of another session"
2787 : : "cannot create as partition of temporary relation of another session")));
2788 :
2789 : /*
2790 : * We should have an UNDER permission flag for this, but for now,
2791 : * demand that creator of a child table own the parent.
2792 : */
2793 8059 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(relation), GetUserId()))
2794 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(relation->rd_rel->relkind),
2795 0 : RelationGetRelationName(relation));
2796 :
2797 8059 : tupleDesc = RelationGetDescr(relation);
2798 8059 : constr = tupleDesc->constr;
2799 :
2800 : /*
2801 : * newattmap->attnums[] will contain the child-table attribute numbers
2802 : * for the attributes of this parent table. (They are not the same
2803 : * for parents after the first one, nor if we have dropped columns.)
2804 : */
2805 8059 : newattmap = make_attrmap(tupleDesc->natts);
2806 :
2807 : /* We can't process inherited defaults until newattmap is complete. */
2808 8059 : inherited_defaults = cols_with_defaults = NIL;
2809 :
2810 : /*
2811 : * Request attnotnull on columns that have a not-null constraint
2812 : * that's not marked NO INHERIT (even if not valid).
2813 : */
2814 8059 : nnconstrs = RelationGetNotNullConstraints(RelationGetRelid(relation),
2815 : true, false);
2816 17854 : foreach_ptr(CookedConstraint, cc, nnconstrs)
2817 1736 : nncols = bms_add_member(nncols, cc->attnum);
2818 :
2819 24150 : for (AttrNumber parent_attno = 1; parent_attno <= tupleDesc->natts;
2820 16091 : parent_attno++)
2821 : {
2822 16115 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
2823 : parent_attno - 1);
2824 16115 : char *attributeName = NameStr(attribute->attname);
2825 : int exist_attno;
2826 : ColumnDef *newdef;
2827 : ColumnDef *mergeddef;
2828 :
2829 : /*
2830 : * Ignore dropped columns in the parent.
2831 : */
2832 16115 : if (attribute->attisdropped)
2833 132 : continue; /* leave newattmap->attnums entry as zero */
2834 :
2835 : /*
2836 : * Create new column definition
2837 : */
2838 15983 : newdef = makeColumnDef(attributeName, attribute->atttypid,
2839 : attribute->atttypmod, attribute->attcollation);
2840 15983 : newdef->storage = attribute->attstorage;
2841 15983 : newdef->generated = attribute->attgenerated;
2842 15983 : if (CompressionMethodIsValid(attribute->attcompression))
2843 24 : newdef->compression =
2844 24 : pstrdup(GetCompressionMethodName(attribute->attcompression));
2845 :
2846 : /*
2847 : * Regular inheritance children are independent enough not to
2848 : * inherit identity columns. But partitions are integral part of
2849 : * a partitioned table and inherit identity column.
2850 : */
2851 15983 : if (is_partition)
2852 13037 : newdef->identity = attribute->attidentity;
2853 :
2854 : /*
2855 : * Does it match some previously considered column from another
2856 : * parent?
2857 : */
2858 15983 : exist_attno = findAttrByName(attributeName, inh_columns);
2859 15983 : if (exist_attno > 0)
2860 : {
2861 : /*
2862 : * Yes, try to merge the two column definitions.
2863 : */
2864 245 : mergeddef = MergeInheritedAttribute(inh_columns, exist_attno, newdef);
2865 :
2866 221 : newattmap->attnums[parent_attno - 1] = exist_attno;
2867 :
2868 : /*
2869 : * Partitions have only one parent, so conflict should never
2870 : * occur.
2871 : */
2872 : Assert(!is_partition);
2873 : }
2874 : else
2875 : {
2876 : /*
2877 : * No, create a new inherited column
2878 : */
2879 15738 : newdef->inhcount = 1;
2880 15738 : newdef->is_local = false;
2881 15738 : inh_columns = lappend(inh_columns, newdef);
2882 :
2883 15738 : newattmap->attnums[parent_attno - 1] = ++child_attno;
2884 15738 : mergeddef = newdef;
2885 : }
2886 :
2887 : /*
2888 : * mark attnotnull if parent has it
2889 : */
2890 15959 : if (bms_is_member(parent_attno, nncols))
2891 1736 : mergeddef->is_not_null = true;
2892 :
2893 : /*
2894 : * Locate default/generation expression if any
2895 : */
2896 15959 : if (attribute->atthasdef)
2897 : {
2898 : Node *this_default;
2899 :
2900 542 : this_default = TupleDescGetDefault(tupleDesc, parent_attno);
2901 542 : if (this_default == NULL)
2902 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
2903 : parent_attno, RelationGetRelationName(relation));
2904 :
2905 : /*
2906 : * If it's a GENERATED default, it might contain Vars that
2907 : * need to be mapped to the inherited column(s)' new numbers.
2908 : * We can't do that till newattmap is ready, so just remember
2909 : * all the inherited default expressions for the moment.
2910 : */
2911 542 : inherited_defaults = lappend(inherited_defaults, this_default);
2912 542 : cols_with_defaults = lappend(cols_with_defaults, mergeddef);
2913 : }
2914 : }
2915 :
2916 : /*
2917 : * Now process any inherited default expressions, adjusting attnos
2918 : * using the completed newattmap map.
2919 : */
2920 8577 : forboth(lc1, inherited_defaults, lc2, cols_with_defaults)
2921 : {
2922 542 : Node *this_default = (Node *) lfirst(lc1);
2923 542 : ColumnDef *def = (ColumnDef *) lfirst(lc2);
2924 : bool found_whole_row;
2925 :
2926 : /* Adjust Vars to match new table's column numbering */
2927 542 : this_default = map_variable_attnos(this_default,
2928 : 1, 0,
2929 : newattmap,
2930 : InvalidOid, &found_whole_row);
2931 :
2932 : /*
2933 : * For the moment we have to reject whole-row variables. We could
2934 : * convert them, if we knew the new table's rowtype OID, but that
2935 : * hasn't been assigned yet. (A variable could only appear in a
2936 : * generation expression, so the error message is correct.)
2937 : */
2938 542 : if (found_whole_row)
2939 0 : ereport(ERROR,
2940 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2941 : errmsg("cannot convert whole-row table reference"),
2942 : errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
2943 : def->colname,
2944 : RelationGetRelationName(relation))));
2945 :
2946 : /*
2947 : * If we already had a default from some prior parent, check to
2948 : * see if they are the same. If so, no problem; if not, mark the
2949 : * column as having a bogus default. Below, we will complain if
2950 : * the bogus default isn't overridden by the child columns.
2951 : */
2952 : Assert(def->raw_default == NULL);
2953 542 : if (def->cooked_default == NULL)
2954 514 : def->cooked_default = this_default;
2955 28 : else if (!equal(def->cooked_default, this_default))
2956 : {
2957 24 : def->cooked_default = &bogus_marker;
2958 24 : have_bogus_defaults = true;
2959 : }
2960 : }
2961 :
2962 : /*
2963 : * Now copy the CHECK constraints of this parent, adjusting attnos
2964 : * using the completed newattmap map. Identically named constraints
2965 : * are merged if possible, else we throw error.
2966 : */
2967 8035 : if (constr && constr->num_check > 0)
2968 : {
2969 245 : ConstrCheck *check = constr->check;
2970 :
2971 770 : for (int i = 0; i < constr->num_check; i++)
2972 : {
2973 525 : char *name = check[i].ccname;
2974 : Node *expr;
2975 : bool found_whole_row;
2976 :
2977 : /* ignore if the constraint is non-inheritable */
2978 525 : if (check[i].ccnoinherit)
2979 32 : continue;
2980 :
2981 : /* Adjust Vars to match new table's column numbering */
2982 493 : expr = map_variable_attnos(stringToNode(check[i].ccbin),
2983 : 1, 0,
2984 : newattmap,
2985 : InvalidOid, &found_whole_row);
2986 :
2987 : /*
2988 : * For the moment we have to reject whole-row variables. We
2989 : * could convert them, if we knew the new table's rowtype OID,
2990 : * but that hasn't been assigned yet.
2991 : */
2992 493 : if (found_whole_row)
2993 0 : ereport(ERROR,
2994 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2995 : errmsg("cannot convert whole-row table reference"),
2996 : errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
2997 : name,
2998 : RelationGetRelationName(relation))));
2999 :
3000 493 : constraints = MergeCheckConstraint(constraints, name, expr,
3001 493 : check[i].ccenforced);
3002 : }
3003 : }
3004 :
3005 : /*
3006 : * Also copy the not-null constraints from this parent. The
3007 : * attnotnull markings were already installed above.
3008 : */
3009 17806 : foreach_ptr(CookedConstraint, nn, nnconstrs)
3010 : {
3011 : Assert(nn->contype == CONSTR_NOTNULL);
3012 :
3013 1736 : nn->attnum = newattmap->attnums[nn->attnum - 1];
3014 :
3015 1736 : nnconstraints = lappend(nnconstraints, nn);
3016 : }
3017 :
3018 8035 : free_attrmap(newattmap);
3019 :
3020 : /*
3021 : * Close the parent rel, but keep our lock on it until xact commit.
3022 : * That will prevent someone else from deleting or ALTERing the parent
3023 : * before the child is committed.
3024 : */
3025 8035 : table_close(relation, NoLock);
3026 : }
3027 :
3028 : /*
3029 : * If we had no inherited attributes, the result columns are just the
3030 : * explicitly declared columns. Otherwise, we need to merge the declared
3031 : * columns into the inherited column list. Although, we never have any
3032 : * explicitly declared columns if the table is a partition.
3033 : */
3034 41635 : if (inh_columns != NIL)
3035 : {
3036 7745 : int newcol_attno = 0;
3037 :
3038 8393 : foreach(lc, columns)
3039 : {
3040 700 : ColumnDef *newdef = lfirst_node(ColumnDef, lc);
3041 700 : char *attributeName = newdef->colname;
3042 : int exist_attno;
3043 :
3044 : /*
3045 : * Partitions have only one parent and have no column definitions
3046 : * of their own, so conflict should never occur.
3047 : */
3048 : Assert(!is_partition);
3049 :
3050 700 : newcol_attno++;
3051 :
3052 : /*
3053 : * Does it match some inherited column?
3054 : */
3055 700 : exist_attno = findAttrByName(attributeName, inh_columns);
3056 700 : if (exist_attno > 0)
3057 : {
3058 : /*
3059 : * Yes, try to merge the two column definitions.
3060 : */
3061 251 : MergeChildAttribute(inh_columns, exist_attno, newcol_attno, newdef);
3062 : }
3063 : else
3064 : {
3065 : /*
3066 : * No, attach new column unchanged to result columns.
3067 : */
3068 449 : inh_columns = lappend(inh_columns, newdef);
3069 : }
3070 : }
3071 :
3072 7693 : columns = inh_columns;
3073 :
3074 : /*
3075 : * Check that we haven't exceeded the legal # of columns after merging
3076 : * in inherited columns.
3077 : */
3078 7693 : if (list_length(columns) > MaxHeapAttributeNumber)
3079 0 : ereport(ERROR,
3080 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
3081 : errmsg("tables can have at most %d columns",
3082 : MaxHeapAttributeNumber)));
3083 : }
3084 :
3085 : /*
3086 : * Now that we have the column definition list for a partition, we can
3087 : * check whether the columns referenced in the column constraint specs
3088 : * actually exist. Also, merge column defaults.
3089 : */
3090 41583 : if (is_partition)
3091 : {
3092 6569 : foreach(lc, saved_columns)
3093 : {
3094 151 : ColumnDef *restdef = lfirst(lc);
3095 151 : bool found = false;
3096 : ListCell *l;
3097 :
3098 549 : foreach(l, columns)
3099 : {
3100 422 : ColumnDef *coldef = lfirst(l);
3101 :
3102 422 : if (strcmp(coldef->colname, restdef->colname) == 0)
3103 : {
3104 151 : found = true;
3105 :
3106 : /*
3107 : * Check for conflicts related to generated columns.
3108 : *
3109 : * Same rules as above: generated-ness has to match the
3110 : * parent, but the contents of the generation expression
3111 : * can be different.
3112 : */
3113 151 : if (coldef->generated)
3114 : {
3115 80 : if (restdef->raw_default && !restdef->generated)
3116 8 : ereport(ERROR,
3117 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3118 : errmsg("column \"%s\" inherits from generated column but specifies default",
3119 : restdef->colname)));
3120 72 : if (restdef->identity)
3121 0 : ereport(ERROR,
3122 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3123 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3124 : restdef->colname)));
3125 : }
3126 : else
3127 : {
3128 71 : if (restdef->generated)
3129 8 : ereport(ERROR,
3130 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3131 : errmsg("child column \"%s\" specifies generation expression",
3132 : restdef->colname),
3133 : errhint("A child table column cannot be generated unless its parent column is.")));
3134 : }
3135 :
3136 135 : if (coldef->generated && restdef->generated && coldef->generated != restdef->generated)
3137 8 : ereport(ERROR,
3138 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3139 : errmsg("column \"%s\" inherits from generated column of different kind",
3140 : restdef->colname),
3141 : errdetail("Parent column is %s, child column is %s.",
3142 : coldef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3143 : restdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3144 :
3145 : /*
3146 : * Override the parent's default value for this column
3147 : * (coldef->cooked_default) with the partition's local
3148 : * definition (restdef->raw_default), if there's one. It
3149 : * should be physically impossible to get a cooked default
3150 : * in the local definition or a raw default in the
3151 : * inherited definition, but make sure they're nulls, for
3152 : * future-proofing.
3153 : */
3154 : Assert(restdef->cooked_default == NULL);
3155 : Assert(coldef->raw_default == NULL);
3156 127 : if (restdef->raw_default)
3157 : {
3158 79 : coldef->raw_default = restdef->raw_default;
3159 79 : coldef->cooked_default = NULL;
3160 : }
3161 : }
3162 : }
3163 :
3164 : /* complain for constraints on columns not in parent */
3165 127 : if (!found)
3166 0 : ereport(ERROR,
3167 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3168 : errmsg("column \"%s\" does not exist",
3169 : restdef->colname)));
3170 : }
3171 : }
3172 :
3173 : /*
3174 : * If we found any conflicting parent default values, check to make sure
3175 : * they were overridden by the child.
3176 : */
3177 41559 : if (have_bogus_defaults)
3178 : {
3179 60 : foreach(lc, columns)
3180 : {
3181 48 : ColumnDef *def = lfirst(lc);
3182 :
3183 48 : if (def->cooked_default == &bogus_marker)
3184 : {
3185 12 : if (def->generated)
3186 8 : ereport(ERROR,
3187 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3188 : errmsg("column \"%s\" inherits conflicting generation expressions",
3189 : def->colname),
3190 : errhint("To resolve the conflict, specify a generation expression explicitly.")));
3191 : else
3192 4 : ereport(ERROR,
3193 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3194 : errmsg("column \"%s\" inherits conflicting default values",
3195 : def->colname),
3196 : errhint("To resolve the conflict, specify a default explicitly.")));
3197 : }
3198 : }
3199 : }
3200 :
3201 41547 : *supconstr = constraints;
3202 41547 : *supnotnulls = nnconstraints;
3203 :
3204 41547 : return columns;
3205 : }
3206 :
3207 :
3208 : /*
3209 : * MergeCheckConstraint
3210 : * Try to merge an inherited CHECK constraint with previous ones
3211 : *
3212 : * If we inherit identically-named constraints from multiple parents, we must
3213 : * merge them, or throw an error if they don't have identical definitions.
3214 : *
3215 : * constraints is a list of CookedConstraint structs for previous constraints.
3216 : *
3217 : * If the new constraint matches an existing one, then the existing
3218 : * constraint's inheritance count is updated. If there is a conflict (same
3219 : * name but different expression), throw an error. If the constraint neither
3220 : * matches nor conflicts with an existing one, a new constraint is appended to
3221 : * the list.
3222 : */
3223 : static List *
3224 493 : MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced)
3225 : {
3226 : ListCell *lc;
3227 : CookedConstraint *newcon;
3228 :
3229 1521 : foreach(lc, constraints)
3230 : {
3231 1128 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lc);
3232 :
3233 : Assert(ccon->contype == CONSTR_CHECK);
3234 :
3235 : /* Non-matching names never conflict */
3236 1128 : if (strcmp(ccon->name, name) != 0)
3237 1028 : continue;
3238 :
3239 100 : if (equal(expr, ccon->expr))
3240 : {
3241 : /* OK to merge constraint with existing */
3242 100 : if (pg_add_s16_overflow(ccon->inhcount, 1,
3243 : &ccon->inhcount))
3244 0 : ereport(ERROR,
3245 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3246 : errmsg("too many inheritance parents"));
3247 :
3248 : /*
3249 : * When enforceability differs, the merged constraint should be
3250 : * marked as ENFORCED because one of the parents is ENFORCED.
3251 : */
3252 100 : if (!ccon->is_enforced && is_enforced)
3253 : {
3254 32 : ccon->is_enforced = true;
3255 32 : ccon->skip_validation = false;
3256 : }
3257 :
3258 100 : return constraints;
3259 : }
3260 :
3261 0 : ereport(ERROR,
3262 : (errcode(ERRCODE_DUPLICATE_OBJECT),
3263 : errmsg("check constraint name \"%s\" appears multiple times but with different expressions",
3264 : name)));
3265 : }
3266 :
3267 : /*
3268 : * Constraint couldn't be merged with an existing one and also didn't
3269 : * conflict with an existing one, so add it as a new one to the list.
3270 : */
3271 393 : newcon = palloc0_object(CookedConstraint);
3272 393 : newcon->contype = CONSTR_CHECK;
3273 393 : newcon->name = pstrdup(name);
3274 393 : newcon->expr = expr;
3275 393 : newcon->inhcount = 1;
3276 393 : newcon->is_enforced = is_enforced;
3277 393 : newcon->skip_validation = !is_enforced;
3278 393 : return lappend(constraints, newcon);
3279 : }
3280 :
3281 : /*
3282 : * MergeChildAttribute
3283 : * Merge given child attribute definition into given inherited attribute.
3284 : *
3285 : * Input arguments:
3286 : * 'inh_columns' is the list of inherited ColumnDefs.
3287 : * 'exist_attno' is the number of the inherited attribute in inh_columns
3288 : * 'newcol_attno' is the attribute number in child table's schema definition
3289 : * 'newdef' is the column/attribute definition from the child table.
3290 : *
3291 : * The ColumnDef in 'inh_columns' list is modified. The child attribute's
3292 : * ColumnDef remains unchanged.
3293 : *
3294 : * Notes:
3295 : * - The attribute is merged according to the rules laid out in the prologue
3296 : * of MergeAttributes().
3297 : * - If matching inherited attribute exists but the child attribute can not be
3298 : * merged into it, the function throws respective errors.
3299 : * - A partition can not have its own column definitions. Hence this function
3300 : * is applicable only to a regular inheritance child.
3301 : */
3302 : static void
3303 251 : MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef)
3304 : {
3305 251 : char *attributeName = newdef->colname;
3306 : ColumnDef *inhdef;
3307 : Oid inhtypeid,
3308 : newtypeid;
3309 : int32 inhtypmod,
3310 : newtypmod;
3311 : Oid inhcollid,
3312 : newcollid;
3313 :
3314 251 : if (exist_attno == newcol_attno)
3315 229 : ereport(NOTICE,
3316 : (errmsg("merging column \"%s\" with inherited definition",
3317 : attributeName)));
3318 : else
3319 22 : ereport(NOTICE,
3320 : (errmsg("moving and merging column \"%s\" with inherited definition", attributeName),
3321 : errdetail("User-specified column moved to the position of the inherited column.")));
3322 :
3323 251 : inhdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3324 :
3325 : /*
3326 : * Must have the same type and typmod
3327 : */
3328 251 : typenameTypeIdAndMod(NULL, inhdef->typeName, &inhtypeid, &inhtypmod);
3329 251 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3330 251 : if (inhtypeid != newtypeid || inhtypmod != newtypmod)
3331 8 : ereport(ERROR,
3332 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3333 : errmsg("column \"%s\" has a type conflict",
3334 : attributeName),
3335 : errdetail("%s versus %s",
3336 : format_type_with_typemod(inhtypeid, inhtypmod),
3337 : format_type_with_typemod(newtypeid, newtypmod))));
3338 :
3339 : /*
3340 : * Must have the same collation
3341 : */
3342 243 : inhcollid = GetColumnDefCollation(NULL, inhdef, inhtypeid);
3343 243 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3344 243 : if (inhcollid != newcollid)
3345 4 : ereport(ERROR,
3346 : (errcode(ERRCODE_COLLATION_MISMATCH),
3347 : errmsg("column \"%s\" has a collation conflict",
3348 : attributeName),
3349 : errdetail("\"%s\" versus \"%s\"",
3350 : get_collation_name(inhcollid),
3351 : get_collation_name(newcollid))));
3352 :
3353 : /*
3354 : * Identity is never inherited by a regular inheritance child. Pick
3355 : * child's identity definition if there's one.
3356 : */
3357 239 : inhdef->identity = newdef->identity;
3358 :
3359 : /*
3360 : * Copy storage parameter
3361 : */
3362 239 : if (inhdef->storage == 0)
3363 0 : inhdef->storage = newdef->storage;
3364 239 : else if (newdef->storage != 0 && inhdef->storage != newdef->storage)
3365 4 : ereport(ERROR,
3366 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3367 : errmsg("column \"%s\" has a storage parameter conflict",
3368 : attributeName),
3369 : errdetail("%s versus %s",
3370 : storage_name(inhdef->storage),
3371 : storage_name(newdef->storage))));
3372 :
3373 : /*
3374 : * Copy compression parameter
3375 : */
3376 235 : if (inhdef->compression == NULL)
3377 231 : inhdef->compression = newdef->compression;
3378 4 : else if (newdef->compression != NULL)
3379 : {
3380 4 : if (strcmp(inhdef->compression, newdef->compression) != 0)
3381 4 : ereport(ERROR,
3382 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3383 : errmsg("column \"%s\" has a compression method conflict",
3384 : attributeName),
3385 : errdetail("%s versus %s", inhdef->compression, newdef->compression)));
3386 : }
3387 :
3388 : /*
3389 : * Merge of not-null constraints = OR 'em together
3390 : */
3391 231 : inhdef->is_not_null |= newdef->is_not_null;
3392 :
3393 : /*
3394 : * Check for conflicts related to generated columns.
3395 : *
3396 : * If the parent column is generated, the child column will be made a
3397 : * generated column if it isn't already. If it is a generated column,
3398 : * we'll take its generation expression in preference to the parent's. We
3399 : * must check that the child column doesn't specify a default value or
3400 : * identity, which matches the rules for a single column in
3401 : * parse_utilcmd.c.
3402 : *
3403 : * Conversely, if the parent column is not generated, the child column
3404 : * can't be either. (We used to allow that, but it results in being able
3405 : * to override the generation expression via UPDATEs through the parent.)
3406 : */
3407 231 : if (inhdef->generated)
3408 : {
3409 41 : if (newdef->raw_default && !newdef->generated)
3410 8 : ereport(ERROR,
3411 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3412 : errmsg("column \"%s\" inherits from generated column but specifies default",
3413 : inhdef->colname)));
3414 33 : if (newdef->identity)
3415 8 : ereport(ERROR,
3416 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3417 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3418 : inhdef->colname)));
3419 : }
3420 : else
3421 : {
3422 190 : if (newdef->generated)
3423 8 : ereport(ERROR,
3424 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3425 : errmsg("child column \"%s\" specifies generation expression",
3426 : inhdef->colname),
3427 : errhint("A child table column cannot be generated unless its parent column is.")));
3428 : }
3429 :
3430 207 : if (inhdef->generated && newdef->generated && newdef->generated != inhdef->generated)
3431 8 : ereport(ERROR,
3432 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3433 : errmsg("column \"%s\" inherits from generated column of different kind",
3434 : inhdef->colname),
3435 : errdetail("Parent column is %s, child column is %s.",
3436 : inhdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3437 : newdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3438 :
3439 : /*
3440 : * If new def has a default, override previous default
3441 : */
3442 199 : if (newdef->raw_default != NULL)
3443 : {
3444 20 : inhdef->raw_default = newdef->raw_default;
3445 20 : inhdef->cooked_default = newdef->cooked_default;
3446 : }
3447 :
3448 : /* Mark the column as locally defined */
3449 199 : inhdef->is_local = true;
3450 199 : }
3451 :
3452 : /*
3453 : * MergeInheritedAttribute
3454 : * Merge given parent attribute definition into specified attribute
3455 : * inherited from the previous parents.
3456 : *
3457 : * Input arguments:
3458 : * 'inh_columns' is the list of previously inherited ColumnDefs.
3459 : * 'exist_attno' is the number the existing matching attribute in inh_columns.
3460 : * 'newdef' is the new parent column/attribute definition to be merged.
3461 : *
3462 : * The matching ColumnDef in 'inh_columns' list is modified and returned.
3463 : *
3464 : * Notes:
3465 : * - The attribute is merged according to the rules laid out in the prologue
3466 : * of MergeAttributes().
3467 : * - If matching inherited attribute exists but the new attribute can not be
3468 : * merged into it, the function throws respective errors.
3469 : * - A partition inherits from only a single parent. Hence this function is
3470 : * applicable only to a regular inheritance.
3471 : */
3472 : static ColumnDef *
3473 245 : MergeInheritedAttribute(List *inh_columns,
3474 : int exist_attno,
3475 : const ColumnDef *newdef)
3476 : {
3477 245 : char *attributeName = newdef->colname;
3478 : ColumnDef *prevdef;
3479 : Oid prevtypeid,
3480 : newtypeid;
3481 : int32 prevtypmod,
3482 : newtypmod;
3483 : Oid prevcollid,
3484 : newcollid;
3485 :
3486 245 : ereport(NOTICE,
3487 : (errmsg("merging multiple inherited definitions of column \"%s\"",
3488 : attributeName)));
3489 245 : prevdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3490 :
3491 : /*
3492 : * Must have the same type and typmod
3493 : */
3494 245 : typenameTypeIdAndMod(NULL, prevdef->typeName, &prevtypeid, &prevtypmod);
3495 245 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3496 245 : if (prevtypeid != newtypeid || prevtypmod != newtypmod)
3497 0 : ereport(ERROR,
3498 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3499 : errmsg("inherited column \"%s\" has a type conflict",
3500 : attributeName),
3501 : errdetail("%s versus %s",
3502 : format_type_with_typemod(prevtypeid, prevtypmod),
3503 : format_type_with_typemod(newtypeid, newtypmod))));
3504 :
3505 : /*
3506 : * Must have the same collation
3507 : */
3508 245 : prevcollid = GetColumnDefCollation(NULL, prevdef, prevtypeid);
3509 245 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3510 245 : if (prevcollid != newcollid)
3511 0 : ereport(ERROR,
3512 : (errcode(ERRCODE_COLLATION_MISMATCH),
3513 : errmsg("inherited column \"%s\" has a collation conflict",
3514 : attributeName),
3515 : errdetail("\"%s\" versus \"%s\"",
3516 : get_collation_name(prevcollid),
3517 : get_collation_name(newcollid))));
3518 :
3519 : /*
3520 : * Copy/check storage parameter
3521 : */
3522 245 : if (prevdef->storage == 0)
3523 0 : prevdef->storage = newdef->storage;
3524 245 : else if (prevdef->storage != newdef->storage)
3525 4 : ereport(ERROR,
3526 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3527 : errmsg("inherited column \"%s\" has a storage parameter conflict",
3528 : attributeName),
3529 : errdetail("%s versus %s",
3530 : storage_name(prevdef->storage),
3531 : storage_name(newdef->storage))));
3532 :
3533 : /*
3534 : * Copy/check compression parameter
3535 : */
3536 241 : if (prevdef->compression == NULL)
3537 229 : prevdef->compression = newdef->compression;
3538 12 : else if (newdef->compression != NULL)
3539 : {
3540 4 : if (strcmp(prevdef->compression, newdef->compression) != 0)
3541 4 : ereport(ERROR,
3542 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3543 : errmsg("column \"%s\" has a compression method conflict",
3544 : attributeName),
3545 : errdetail("%s versus %s",
3546 : prevdef->compression, newdef->compression)));
3547 : }
3548 :
3549 : /*
3550 : * Check for GENERATED conflicts
3551 : */
3552 237 : if (prevdef->generated != newdef->generated)
3553 16 : ereport(ERROR,
3554 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3555 : errmsg("inherited column \"%s\" has a generation conflict",
3556 : attributeName)));
3557 :
3558 : /*
3559 : * Default and other constraints are handled by the caller.
3560 : */
3561 :
3562 221 : if (pg_add_s16_overflow(prevdef->inhcount, 1,
3563 : &prevdef->inhcount))
3564 0 : ereport(ERROR,
3565 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3566 : errmsg("too many inheritance parents"));
3567 :
3568 221 : return prevdef;
3569 : }
3570 :
3571 : /*
3572 : * StoreCatalogInheritance
3573 : * Updates the system catalogs with proper inheritance information.
3574 : *
3575 : * supers is a list of the OIDs of the new relation's direct ancestors.
3576 : */
3577 : static void
3578 41105 : StoreCatalogInheritance(Oid relationId, List *supers,
3579 : bool child_is_partition)
3580 : {
3581 : Relation relation;
3582 : int32 seqNumber;
3583 : ListCell *entry;
3584 :
3585 : /*
3586 : * sanity checks
3587 : */
3588 : Assert(OidIsValid(relationId));
3589 :
3590 41105 : if (supers == NIL)
3591 33652 : return;
3592 :
3593 : /*
3594 : * Store INHERITS information in pg_inherits using direct ancestors only.
3595 : * Also enter dependencies on the direct ancestors, and make sure they are
3596 : * marked with relhassubclass = true.
3597 : *
3598 : * (Once upon a time, both direct and indirect ancestors were found here
3599 : * and then entered into pg_ipl. Since that catalog doesn't exist
3600 : * anymore, there's no need to look for indirect ancestors.)
3601 : */
3602 7453 : relation = table_open(InheritsRelationId, RowExclusiveLock);
3603 :
3604 7453 : seqNumber = 1;
3605 15128 : foreach(entry, supers)
3606 : {
3607 7675 : Oid parentOid = lfirst_oid(entry);
3608 :
3609 7675 : StoreCatalogInheritance1(relationId, parentOid, seqNumber, relation,
3610 : child_is_partition);
3611 7675 : seqNumber++;
3612 : }
3613 :
3614 7453 : table_close(relation, RowExclusiveLock);
3615 : }
3616 :
3617 : /*
3618 : * Make catalog entries showing relationId as being an inheritance child
3619 : * of parentOid. inhRelation is the already-opened pg_inherits catalog.
3620 : */
3621 : static void
3622 9732 : StoreCatalogInheritance1(Oid relationId, Oid parentOid,
3623 : int32 seqNumber, Relation inhRelation,
3624 : bool child_is_partition)
3625 : {
3626 : ObjectAddress childobject,
3627 : parentobject;
3628 :
3629 : /* store the pg_inherits row */
3630 9732 : StoreSingleInheritance(relationId, parentOid, seqNumber);
3631 :
3632 : /*
3633 : * Store a dependency too
3634 : */
3635 9732 : parentobject.classId = RelationRelationId;
3636 9732 : parentobject.objectId = parentOid;
3637 9732 : parentobject.objectSubId = 0;
3638 9732 : childobject.classId = RelationRelationId;
3639 9732 : childobject.objectId = relationId;
3640 9732 : childobject.objectSubId = 0;
3641 :
3642 9732 : recordDependencyOn(&childobject, &parentobject,
3643 : child_dependency_type(child_is_partition));
3644 :
3645 : /*
3646 : * Post creation hook of this inheritance. Since object_access_hook
3647 : * doesn't take multiple object identifiers, we relay oid of parent
3648 : * relation using auxiliary_id argument.
3649 : */
3650 9732 : InvokeObjectPostAlterHookArg(InheritsRelationId,
3651 : relationId, 0,
3652 : parentOid, false);
3653 :
3654 : /*
3655 : * Mark the parent as having subclasses.
3656 : */
3657 9732 : SetRelationHasSubclass(parentOid, true);
3658 9732 : }
3659 :
3660 : /*
3661 : * Look for an existing column entry with the given name.
3662 : *
3663 : * Returns the index (starting with 1) if attribute already exists in columns,
3664 : * 0 if it doesn't.
3665 : */
3666 : static int
3667 16683 : findAttrByName(const char *attributeName, const List *columns)
3668 : {
3669 : ListCell *lc;
3670 16683 : int i = 1;
3671 :
3672 30232 : foreach(lc, columns)
3673 : {
3674 14045 : if (strcmp(attributeName, lfirst_node(ColumnDef, lc)->colname) == 0)
3675 496 : return i;
3676 :
3677 13549 : i++;
3678 : }
3679 16187 : return 0;
3680 : }
3681 :
3682 :
3683 : /*
3684 : * SetRelationHasSubclass
3685 : * Set the value of the relation's relhassubclass field in pg_class.
3686 : *
3687 : * It's always safe to set this field to true, because all SQL commands are
3688 : * ready to see true and then find no children. On the other hand, commands
3689 : * generally assume zero children if this is false.
3690 : *
3691 : * Caller must hold any self-exclusive lock until end of transaction. If the
3692 : * new value is false, caller must have acquired that lock before reading the
3693 : * evidence that justified the false value. That way, it properly waits if
3694 : * another backend is simultaneously concluding no need to change the tuple
3695 : * (new and old values are true).
3696 : *
3697 : * NOTE: an important side-effect of this operation is that an SI invalidation
3698 : * message is sent out to all backends --- including me --- causing plans
3699 : * referencing the relation to be rebuilt with the new list of children.
3700 : * This must happen even if we find that no change is needed in the pg_class
3701 : * row.
3702 : */
3703 : void
3704 12225 : SetRelationHasSubclass(Oid relationId, bool relhassubclass)
3705 : {
3706 : Relation relationRelation;
3707 : HeapTuple tuple;
3708 : Form_pg_class classtuple;
3709 :
3710 : Assert(CheckRelationOidLockedByMe(relationId,
3711 : ShareUpdateExclusiveLock, false) ||
3712 : CheckRelationOidLockedByMe(relationId,
3713 : ShareRowExclusiveLock, true));
3714 :
3715 : /*
3716 : * Fetch a modifiable copy of the tuple, modify it, update pg_class.
3717 : */
3718 12225 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
3719 12225 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
3720 12225 : if (!HeapTupleIsValid(tuple))
3721 0 : elog(ERROR, "cache lookup failed for relation %u", relationId);
3722 12225 : classtuple = (Form_pg_class) GETSTRUCT(tuple);
3723 :
3724 12225 : if (classtuple->relhassubclass != relhassubclass)
3725 : {
3726 5508 : classtuple->relhassubclass = relhassubclass;
3727 5508 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
3728 : }
3729 : else
3730 : {
3731 : /* no need to change tuple, but force relcache rebuild anyway */
3732 6717 : CacheInvalidateRelcacheByTuple(tuple);
3733 : }
3734 :
3735 12225 : heap_freetuple(tuple);
3736 12225 : table_close(relationRelation, RowExclusiveLock);
3737 12225 : }
3738 :
3739 : /*
3740 : * CheckRelationTableSpaceMove
3741 : * Check if relation can be moved to new tablespace.
3742 : *
3743 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3744 : *
3745 : * Returns true if the relation can be moved to the new tablespace; raises
3746 : * an error if it is not possible to do the move; returns false if the move
3747 : * would have no effect.
3748 : */
3749 : bool
3750 142 : CheckRelationTableSpaceMove(Relation rel, Oid newTableSpaceId)
3751 : {
3752 : Oid oldTableSpaceId;
3753 :
3754 : /*
3755 : * No work if no change in tablespace. Note that MyDatabaseTableSpace is
3756 : * stored as 0.
3757 : */
3758 142 : oldTableSpaceId = rel->rd_rel->reltablespace;
3759 142 : if (newTableSpaceId == oldTableSpaceId ||
3760 137 : (newTableSpaceId == MyDatabaseTableSpace && oldTableSpaceId == 0))
3761 10 : return false;
3762 :
3763 : /*
3764 : * We cannot support moving mapped relations into different tablespaces.
3765 : * (In particular this eliminates all shared catalogs.)
3766 : */
3767 132 : if (RelationIsMapped(rel))
3768 0 : ereport(ERROR,
3769 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3770 : errmsg("cannot move system relation \"%s\"",
3771 : RelationGetRelationName(rel))));
3772 :
3773 : /* Cannot move a non-shared relation into pg_global */
3774 132 : if (newTableSpaceId == GLOBALTABLESPACE_OID)
3775 8 : ereport(ERROR,
3776 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3777 : errmsg("only shared relations can be placed in pg_global tablespace")));
3778 :
3779 : /*
3780 : * Do not allow moving temp tables of other backends ... their local
3781 : * buffer manager is not going to cope.
3782 : */
3783 124 : if (RELATION_IS_OTHER_TEMP(rel))
3784 0 : ereport(ERROR,
3785 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3786 : errmsg("cannot move temporary tables of other sessions")));
3787 :
3788 124 : return true;
3789 : }
3790 :
3791 : /*
3792 : * SetRelationTableSpace
3793 : * Set new reltablespace and relfilenumber in pg_class entry.
3794 : *
3795 : * newTableSpaceId is the new tablespace for the relation, and
3796 : * newRelFilenumber its new filenumber. If newRelFilenumber is
3797 : * InvalidRelFileNumber, this field is not updated.
3798 : *
3799 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3800 : *
3801 : * The caller of this routine had better check if a relation can be
3802 : * moved to this new tablespace by calling CheckRelationTableSpaceMove()
3803 : * first, and is responsible for making the change visible with
3804 : * CommandCounterIncrement().
3805 : */
3806 : void
3807 124 : SetRelationTableSpace(Relation rel,
3808 : Oid newTableSpaceId,
3809 : RelFileNumber newRelFilenumber)
3810 : {
3811 : Relation pg_class;
3812 : HeapTuple tuple;
3813 : ItemPointerData otid;
3814 : Form_pg_class rd_rel;
3815 124 : Oid reloid = RelationGetRelid(rel);
3816 :
3817 : Assert(CheckRelationTableSpaceMove(rel, newTableSpaceId));
3818 :
3819 : /* Get a modifiable copy of the relation's pg_class row. */
3820 124 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
3821 :
3822 124 : tuple = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(reloid));
3823 124 : if (!HeapTupleIsValid(tuple))
3824 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
3825 124 : otid = tuple->t_self;
3826 124 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
3827 :
3828 : /* Update the pg_class row. */
3829 248 : rd_rel->reltablespace = (newTableSpaceId == MyDatabaseTableSpace) ?
3830 124 : InvalidOid : newTableSpaceId;
3831 124 : if (RelFileNumberIsValid(newRelFilenumber))
3832 95 : rd_rel->relfilenode = newRelFilenumber;
3833 124 : CatalogTupleUpdate(pg_class, &otid, tuple);
3834 124 : UnlockTuple(pg_class, &otid, InplaceUpdateTupleLock);
3835 :
3836 : /*
3837 : * Record dependency on tablespace. This is only required for relations
3838 : * that have no physical storage.
3839 : */
3840 124 : if (!RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
3841 20 : changeDependencyOnTablespace(RelationRelationId, reloid,
3842 : rd_rel->reltablespace);
3843 :
3844 124 : heap_freetuple(tuple);
3845 124 : table_close(pg_class, RowExclusiveLock);
3846 124 : }
3847 :
3848 : /*
3849 : * renameatt_check - basic sanity checks before attribute rename
3850 : */
3851 : static void
3852 669 : renameatt_check(Oid myrelid, Form_pg_class classform, bool recursing)
3853 : {
3854 669 : char relkind = classform->relkind;
3855 :
3856 669 : if (classform->reloftype && !recursing)
3857 4 : ereport(ERROR,
3858 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3859 : errmsg("cannot rename column of typed table")));
3860 :
3861 : /*
3862 : * Renaming the columns of sequences or toast tables doesn't actually
3863 : * break anything from the system's point of view, since internal
3864 : * references are by attnum. But it doesn't seem right to allow users to
3865 : * change names that are hardcoded into the system, hence the following
3866 : * restriction.
3867 : */
3868 665 : if (relkind != RELKIND_RELATION &&
3869 57 : relkind != RELKIND_VIEW &&
3870 57 : relkind != RELKIND_MATVIEW &&
3871 25 : relkind != RELKIND_COMPOSITE_TYPE &&
3872 25 : relkind != RELKIND_INDEX &&
3873 25 : relkind != RELKIND_PARTITIONED_INDEX &&
3874 0 : relkind != RELKIND_FOREIGN_TABLE &&
3875 : relkind != RELKIND_PARTITIONED_TABLE)
3876 0 : ereport(ERROR,
3877 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3878 : errmsg("cannot rename columns of relation \"%s\"",
3879 : NameStr(classform->relname)),
3880 : errdetail_relkind_not_supported(relkind)));
3881 :
3882 : /*
3883 : * permissions checking. only the owner of a class can change its schema.
3884 : */
3885 665 : if (!object_ownercheck(RelationRelationId, myrelid, GetUserId()))
3886 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(myrelid)),
3887 0 : NameStr(classform->relname));
3888 665 : if (!allowSystemTableMods && IsSystemClass(myrelid, classform))
3889 1 : ereport(ERROR,
3890 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3891 : errmsg("permission denied: \"%s\" is a system catalog",
3892 : NameStr(classform->relname))));
3893 664 : }
3894 :
3895 : /*
3896 : * renameatt_internal - workhorse for renameatt
3897 : *
3898 : * Return value is the attribute number in the 'myrelid' relation.
3899 : */
3900 : static AttrNumber
3901 367 : renameatt_internal(Oid myrelid,
3902 : const char *oldattname,
3903 : const char *newattname,
3904 : bool recurse,
3905 : bool recursing,
3906 : int expected_parents,
3907 : DropBehavior behavior)
3908 : {
3909 : Relation targetrelation;
3910 : Relation attrelation;
3911 : HeapTuple atttup;
3912 : Form_pg_attribute attform;
3913 : AttrNumber attnum;
3914 :
3915 : /*
3916 : * Grab an exclusive lock on the target table, which we will NOT release
3917 : * until end of transaction.
3918 : */
3919 367 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
3920 367 : renameatt_check(myrelid, RelationGetForm(targetrelation), recursing);
3921 :
3922 : /*
3923 : * if the 'recurse' flag is set then we are supposed to rename this
3924 : * attribute in all classes that inherit from 'relname' (as well as in
3925 : * 'relname').
3926 : *
3927 : * any permissions or problems with duplicate attributes will cause the
3928 : * whole transaction to abort, which is what we want -- all or nothing.
3929 : */
3930 367 : if (recurse)
3931 : {
3932 : List *child_oids,
3933 : *child_numparents;
3934 : ListCell *lo,
3935 : *li;
3936 :
3937 : /*
3938 : * we need the number of parents for each child so that the recursive
3939 : * calls to renameatt() can determine whether there are any parents
3940 : * outside the inheritance hierarchy being processed.
3941 : */
3942 165 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
3943 : &child_numparents);
3944 :
3945 : /*
3946 : * find_all_inheritors does the recursive search of the inheritance
3947 : * hierarchy, so all we have to do is process all of the relids in the
3948 : * list that it returns.
3949 : */
3950 488 : forboth(lo, child_oids, li, child_numparents)
3951 : {
3952 343 : Oid childrelid = lfirst_oid(lo);
3953 343 : int numparents = lfirst_int(li);
3954 :
3955 343 : if (childrelid == myrelid)
3956 165 : continue;
3957 : /* note we need not recurse again */
3958 178 : renameatt_internal(childrelid, oldattname, newattname, false, true, numparents, behavior);
3959 : }
3960 : }
3961 : else
3962 : {
3963 : /*
3964 : * If we are told not to recurse, there had better not be any child
3965 : * tables; else the rename would put them out of step.
3966 : *
3967 : * expected_parents will only be 0 if we are not already recursing.
3968 : */
3969 226 : if (expected_parents == 0 &&
3970 24 : find_inheritance_children(myrelid, NoLock) != NIL)
3971 8 : ereport(ERROR,
3972 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3973 : errmsg("inherited column \"%s\" must be renamed in child tables too",
3974 : oldattname)));
3975 : }
3976 :
3977 : /* rename attributes in typed tables of composite type */
3978 339 : if (targetrelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
3979 : {
3980 : List *child_oids;
3981 : ListCell *lo;
3982 :
3983 16 : child_oids = find_typed_table_dependencies(targetrelation->rd_rel->reltype,
3984 16 : RelationGetRelationName(targetrelation),
3985 : behavior);
3986 :
3987 16 : foreach(lo, child_oids)
3988 4 : renameatt_internal(lfirst_oid(lo), oldattname, newattname, true, true, 0, behavior);
3989 : }
3990 :
3991 335 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
3992 :
3993 335 : atttup = SearchSysCacheCopyAttName(myrelid, oldattname);
3994 335 : if (!HeapTupleIsValid(atttup))
3995 16 : ereport(ERROR,
3996 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3997 : errmsg("column \"%s\" does not exist",
3998 : oldattname)));
3999 319 : attform = (Form_pg_attribute) GETSTRUCT(atttup);
4000 :
4001 319 : attnum = attform->attnum;
4002 319 : if (attnum <= 0)
4003 0 : ereport(ERROR,
4004 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4005 : errmsg("cannot rename system column \"%s\"",
4006 : oldattname)));
4007 :
4008 : /*
4009 : * if the attribute is inherited, forbid the renaming. if this is a
4010 : * top-level call to renameatt(), then expected_parents will be 0, so the
4011 : * effect of this code will be to prohibit the renaming if the attribute
4012 : * is inherited at all. if this is a recursive call to renameatt(),
4013 : * expected_parents will be the number of parents the current relation has
4014 : * within the inheritance hierarchy being processed, so we'll prohibit the
4015 : * renaming only if there are additional parents from elsewhere.
4016 : */
4017 319 : if (attform->attinhcount > expected_parents)
4018 20 : ereport(ERROR,
4019 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4020 : errmsg("cannot rename inherited column \"%s\"",
4021 : oldattname)));
4022 :
4023 : /* new name should not already exist */
4024 299 : (void) check_for_column_name_collision(targetrelation, newattname, false);
4025 :
4026 : /* apply the update */
4027 291 : namestrcpy(&(attform->attname), newattname);
4028 :
4029 291 : CatalogTupleUpdate(attrelation, &atttup->t_self, atttup);
4030 :
4031 291 : InvokeObjectPostAlterHook(RelationRelationId, myrelid, attnum);
4032 :
4033 291 : heap_freetuple(atttup);
4034 :
4035 291 : table_close(attrelation, RowExclusiveLock);
4036 :
4037 291 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4038 :
4039 291 : return attnum;
4040 : }
4041 :
4042 : /*
4043 : * Perform permissions and integrity checks before acquiring a relation lock.
4044 : */
4045 : static void
4046 270 : RangeVarCallbackForRenameAttribute(const RangeVar *rv, Oid relid, Oid oldrelid,
4047 : void *arg)
4048 : {
4049 : HeapTuple tuple;
4050 : Form_pg_class form;
4051 :
4052 270 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
4053 270 : if (!HeapTupleIsValid(tuple))
4054 24 : return; /* concurrently dropped */
4055 246 : form = (Form_pg_class) GETSTRUCT(tuple);
4056 246 : renameatt_check(relid, form, false);
4057 241 : ReleaseSysCache(tuple);
4058 : }
4059 :
4060 : /*
4061 : * renameatt - changes the name of an attribute in a relation
4062 : *
4063 : * The returned ObjectAddress is that of the renamed column.
4064 : */
4065 : ObjectAddress
4066 210 : renameatt(RenameStmt *stmt)
4067 : {
4068 : Oid relid;
4069 : AttrNumber attnum;
4070 : ObjectAddress address;
4071 :
4072 : /* lock level taken here should match renameatt_internal */
4073 210 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4074 210 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4075 : RangeVarCallbackForRenameAttribute,
4076 : NULL);
4077 :
4078 201 : if (!OidIsValid(relid))
4079 : {
4080 16 : ereport(NOTICE,
4081 : (errmsg("relation \"%s\" does not exist, skipping",
4082 : stmt->relation->relname)));
4083 16 : return InvalidObjectAddress;
4084 : }
4085 :
4086 : attnum =
4087 185 : renameatt_internal(relid,
4088 185 : stmt->subname, /* old att name */
4089 185 : stmt->newname, /* new att name */
4090 185 : stmt->relation->inh, /* recursive? */
4091 : false, /* recursing? */
4092 : 0, /* expected inhcount */
4093 : stmt->behavior);
4094 :
4095 129 : ObjectAddressSubSet(address, RelationRelationId, relid, attnum);
4096 :
4097 129 : return address;
4098 : }
4099 :
4100 : /*
4101 : * same logic as renameatt_internal
4102 : */
4103 : static ObjectAddress
4104 60 : rename_constraint_internal(Oid myrelid,
4105 : Oid mytypid,
4106 : const char *oldconname,
4107 : const char *newconname,
4108 : bool recurse,
4109 : bool recursing,
4110 : int expected_parents)
4111 : {
4112 60 : Relation targetrelation = NULL;
4113 : Oid constraintOid;
4114 : HeapTuple tuple;
4115 : Form_pg_constraint con;
4116 : ObjectAddress address;
4117 :
4118 : Assert(!myrelid || !mytypid);
4119 :
4120 60 : if (mytypid)
4121 : {
4122 4 : constraintOid = get_domain_constraint_oid(mytypid, oldconname, false);
4123 : }
4124 : else
4125 : {
4126 56 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
4127 :
4128 : /*
4129 : * don't tell it whether we're recursing; we allow changing typed
4130 : * tables here
4131 : */
4132 56 : renameatt_check(myrelid, RelationGetForm(targetrelation), false);
4133 :
4134 56 : constraintOid = get_relation_constraint_oid(myrelid, oldconname, false);
4135 : }
4136 :
4137 60 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
4138 60 : if (!HeapTupleIsValid(tuple))
4139 0 : elog(ERROR, "cache lookup failed for constraint %u",
4140 : constraintOid);
4141 60 : con = (Form_pg_constraint) GETSTRUCT(tuple);
4142 :
4143 60 : if (myrelid &&
4144 56 : (con->contype == CONSTRAINT_CHECK ||
4145 16 : con->contype == CONSTRAINT_NOTNULL) &&
4146 44 : !con->connoinherit)
4147 : {
4148 36 : if (recurse)
4149 : {
4150 : List *child_oids,
4151 : *child_numparents;
4152 : ListCell *lo,
4153 : *li;
4154 :
4155 24 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
4156 : &child_numparents);
4157 :
4158 56 : forboth(lo, child_oids, li, child_numparents)
4159 : {
4160 32 : Oid childrelid = lfirst_oid(lo);
4161 32 : int numparents = lfirst_int(li);
4162 :
4163 32 : if (childrelid == myrelid)
4164 24 : continue;
4165 :
4166 8 : rename_constraint_internal(childrelid, InvalidOid, oldconname, newconname, false, true, numparents);
4167 : }
4168 : }
4169 : else
4170 : {
4171 16 : if (expected_parents == 0 &&
4172 4 : find_inheritance_children(myrelid, NoLock) != NIL)
4173 4 : ereport(ERROR,
4174 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4175 : errmsg("inherited constraint \"%s\" must be renamed in child tables too",
4176 : oldconname)));
4177 : }
4178 :
4179 32 : if (con->coninhcount > expected_parents)
4180 4 : ereport(ERROR,
4181 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4182 : errmsg("cannot rename inherited constraint \"%s\"",
4183 : oldconname)));
4184 : }
4185 :
4186 52 : if (con->conindid
4187 12 : && (con->contype == CONSTRAINT_PRIMARY
4188 4 : || con->contype == CONSTRAINT_UNIQUE
4189 0 : || con->contype == CONSTRAINT_EXCLUSION))
4190 : /* rename the index; this renames the constraint as well */
4191 12 : RenameRelationInternal(con->conindid, newconname, false, true);
4192 : else
4193 40 : RenameConstraintById(constraintOid, newconname);
4194 :
4195 52 : ObjectAddressSet(address, ConstraintRelationId, constraintOid);
4196 :
4197 52 : ReleaseSysCache(tuple);
4198 :
4199 52 : if (targetrelation)
4200 : {
4201 : /*
4202 : * Invalidate relcache so as others can see the new constraint name.
4203 : */
4204 48 : CacheInvalidateRelcache(targetrelation);
4205 :
4206 48 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4207 : }
4208 :
4209 52 : return address;
4210 : }
4211 :
4212 : ObjectAddress
4213 56 : RenameConstraint(RenameStmt *stmt)
4214 : {
4215 56 : Oid relid = InvalidOid;
4216 56 : Oid typid = InvalidOid;
4217 :
4218 56 : if (stmt->renameType == OBJECT_DOMCONSTRAINT)
4219 : {
4220 : Relation rel;
4221 : HeapTuple tup;
4222 :
4223 4 : typid = typenameTypeId(NULL, makeTypeNameFromNameList(castNode(List, stmt->object)));
4224 4 : rel = table_open(TypeRelationId, RowExclusiveLock);
4225 4 : tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
4226 4 : if (!HeapTupleIsValid(tup))
4227 0 : elog(ERROR, "cache lookup failed for type %u", typid);
4228 4 : checkDomainOwner(tup);
4229 4 : ReleaseSysCache(tup);
4230 4 : table_close(rel, NoLock);
4231 : }
4232 : else
4233 : {
4234 : /* lock level taken here should match rename_constraint_internal */
4235 52 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4236 52 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4237 : RangeVarCallbackForRenameAttribute,
4238 : NULL);
4239 52 : if (!OidIsValid(relid))
4240 : {
4241 4 : ereport(NOTICE,
4242 : (errmsg("relation \"%s\" does not exist, skipping",
4243 : stmt->relation->relname)));
4244 4 : return InvalidObjectAddress;
4245 : }
4246 : }
4247 :
4248 : return
4249 52 : rename_constraint_internal(relid, typid,
4250 52 : stmt->subname,
4251 52 : stmt->newname,
4252 100 : (stmt->relation &&
4253 48 : stmt->relation->inh), /* recursive? */
4254 : false, /* recursing? */
4255 52 : 0 /* expected inhcount */ );
4256 : }
4257 :
4258 : /*
4259 : * Execute ALTER TABLE/INDEX/SEQUENCE/VIEW/MATERIALIZED VIEW/FOREIGN TABLE/PROPERTY GRAPH
4260 : * RENAME
4261 : */
4262 : ObjectAddress
4263 327 : RenameRelation(RenameStmt *stmt)
4264 : {
4265 327 : bool is_index_stmt = stmt->renameType == OBJECT_INDEX;
4266 : Oid relid;
4267 : ObjectAddress address;
4268 :
4269 : /*
4270 : * Grab an exclusive lock on the target table, index, sequence, view,
4271 : * materialized view, or foreign table, which we will NOT release until
4272 : * end of transaction.
4273 : *
4274 : * Lock level used here should match RenameRelationInternal, to avoid lock
4275 : * escalation. However, because ALTER INDEX can be used with any relation
4276 : * type, we mustn't believe without verification.
4277 : */
4278 : for (;;)
4279 8 : {
4280 : LOCKMODE lockmode;
4281 : char relkind;
4282 : bool obj_is_index;
4283 :
4284 335 : lockmode = is_index_stmt ? ShareUpdateExclusiveLock : AccessExclusiveLock;
4285 :
4286 335 : relid = RangeVarGetRelidExtended(stmt->relation, lockmode,
4287 335 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4288 : RangeVarCallbackForAlterRelation,
4289 : stmt);
4290 :
4291 298 : if (!OidIsValid(relid))
4292 : {
4293 12 : ereport(NOTICE,
4294 : (errmsg("relation \"%s\" does not exist, skipping",
4295 : stmt->relation->relname)));
4296 12 : return InvalidObjectAddress;
4297 : }
4298 :
4299 : /*
4300 : * We allow mismatched statement and object types (e.g., ALTER INDEX
4301 : * to rename a table), but we might've used the wrong lock level. If
4302 : * that happens, retry with the correct lock level. We don't bother
4303 : * if we already acquired AccessExclusiveLock with an index, however.
4304 : */
4305 286 : relkind = get_rel_relkind(relid);
4306 286 : obj_is_index = (relkind == RELKIND_INDEX ||
4307 : relkind == RELKIND_PARTITIONED_INDEX);
4308 286 : if (obj_is_index || is_index_stmt == obj_is_index)
4309 : break;
4310 :
4311 8 : UnlockRelationOid(relid, lockmode);
4312 8 : is_index_stmt = obj_is_index;
4313 : }
4314 :
4315 : /* Do the work */
4316 278 : RenameRelationInternal(relid, stmt->newname, false, is_index_stmt);
4317 :
4318 266 : ObjectAddressSet(address, RelationRelationId, relid);
4319 :
4320 266 : return address;
4321 : }
4322 :
4323 : /*
4324 : * RenameRelationInternal - change the name of a relation
4325 : */
4326 : void
4327 1104 : RenameRelationInternal(Oid myrelid, const char *newrelname, bool is_internal, bool is_index)
4328 : {
4329 : Relation targetrelation;
4330 : Relation relrelation; /* for RELATION relation */
4331 : ItemPointerData otid;
4332 : HeapTuple reltup;
4333 : Form_pg_class relform;
4334 : Oid namespaceId;
4335 :
4336 : /*
4337 : * Grab a lock on the target relation, which we will NOT release until end
4338 : * of transaction. We need at least a self-exclusive lock so that
4339 : * concurrent DDL doesn't overwrite the rename if they start updating
4340 : * while still seeing the old version. The lock also guards against
4341 : * triggering relcache reloads in concurrent sessions, which might not
4342 : * handle this information changing under them. For indexes, we can use a
4343 : * reduced lock level because RelationReloadIndexInfo() handles indexes
4344 : * specially.
4345 : */
4346 1104 : targetrelation = relation_open(myrelid, is_index ? ShareUpdateExclusiveLock : AccessExclusiveLock);
4347 1104 : namespaceId = RelationGetNamespace(targetrelation);
4348 :
4349 : /*
4350 : * Find relation's pg_class tuple, and make sure newrelname isn't in use.
4351 : */
4352 1104 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4353 :
4354 1104 : reltup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(myrelid));
4355 1104 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4356 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4357 1104 : otid = reltup->t_self;
4358 1104 : relform = (Form_pg_class) GETSTRUCT(reltup);
4359 :
4360 1104 : if (get_relname_relid(newrelname, namespaceId) != InvalidOid)
4361 12 : ereport(ERROR,
4362 : (errcode(ERRCODE_DUPLICATE_TABLE),
4363 : errmsg("relation \"%s\" already exists",
4364 : newrelname)));
4365 :
4366 : /*
4367 : * RenameRelation is careful not to believe the caller's idea of the
4368 : * relation kind being handled. We don't have to worry about this, but
4369 : * let's not be totally oblivious to it. We can process an index as
4370 : * not-an-index, but not the other way around.
4371 : */
4372 : Assert(!is_index ||
4373 : is_index == (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4374 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX));
4375 :
4376 : /*
4377 : * Update pg_class tuple with new relname. (Scribbling on reltup is OK
4378 : * because it's a copy...)
4379 : */
4380 1092 : namestrcpy(&(relform->relname), newrelname);
4381 :
4382 1092 : CatalogTupleUpdate(relrelation, &otid, reltup);
4383 1092 : UnlockTuple(relrelation, &otid, InplaceUpdateTupleLock);
4384 :
4385 1092 : InvokeObjectPostAlterHookArg(RelationRelationId, myrelid, 0,
4386 : InvalidOid, is_internal);
4387 :
4388 1092 : heap_freetuple(reltup);
4389 1092 : table_close(relrelation, RowExclusiveLock);
4390 :
4391 : /*
4392 : * Also rename the associated type, if any.
4393 : */
4394 1092 : if (OidIsValid(targetrelation->rd_rel->reltype))
4395 128 : RenameTypeInternal(targetrelation->rd_rel->reltype,
4396 : newrelname, namespaceId);
4397 :
4398 : /*
4399 : * Also rename the associated constraint, if any.
4400 : */
4401 1092 : if (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4402 604 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
4403 : {
4404 500 : Oid constraintId = get_index_constraint(myrelid);
4405 :
4406 500 : if (OidIsValid(constraintId))
4407 24 : RenameConstraintById(constraintId, newrelname);
4408 : }
4409 :
4410 : /*
4411 : * Close rel, but keep lock!
4412 : */
4413 1092 : relation_close(targetrelation, NoLock);
4414 1092 : }
4415 :
4416 : /*
4417 : * ResetRelRewrite - reset relrewrite
4418 : */
4419 : void
4420 379 : ResetRelRewrite(Oid myrelid)
4421 : {
4422 : Relation relrelation; /* for RELATION relation */
4423 : HeapTuple reltup;
4424 : Form_pg_class relform;
4425 :
4426 : /*
4427 : * Find relation's pg_class tuple.
4428 : */
4429 379 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4430 :
4431 379 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
4432 379 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4433 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4434 379 : relform = (Form_pg_class) GETSTRUCT(reltup);
4435 :
4436 : /*
4437 : * Update pg_class tuple.
4438 : */
4439 379 : relform->relrewrite = InvalidOid;
4440 :
4441 379 : CatalogTupleUpdate(relrelation, &reltup->t_self, reltup);
4442 :
4443 379 : heap_freetuple(reltup);
4444 379 : table_close(relrelation, RowExclusiveLock);
4445 379 : }
4446 :
4447 : /*
4448 : * Disallow ALTER TABLE (and similar commands) when the current backend has
4449 : * any open reference to the target table besides the one just acquired by
4450 : * the calling command; this implies there's an open cursor or active plan.
4451 : * We need this check because our lock doesn't protect us against stomping
4452 : * on our own foot, only other people's feet!
4453 : *
4454 : * For ALTER TABLE, the only case known to cause serious trouble is ALTER
4455 : * COLUMN TYPE, and some changes are obviously pretty benign, so this could
4456 : * possibly be relaxed to only error out for certain types of alterations.
4457 : * But the use-case for allowing any of these things is not obvious, so we
4458 : * won't work hard at it for now.
4459 : *
4460 : * We also reject these commands if there are any pending AFTER trigger events
4461 : * for the rel. This is certainly necessary for the rewriting variants of
4462 : * ALTER TABLE, because they don't preserve tuple TIDs and so the pending
4463 : * events would try to fetch the wrong tuples. It might be overly cautious
4464 : * in other cases, but again it seems better to err on the side of paranoia.
4465 : *
4466 : * REINDEX calls this with "rel" referencing the index to be rebuilt; here
4467 : * we are worried about active indexscans on the index. The trigger-event
4468 : * check can be skipped, since we are doing no damage to the parent table.
4469 : *
4470 : * The statement name (eg, "ALTER TABLE") is passed for use in error messages.
4471 : */
4472 : void
4473 115235 : CheckTableNotInUse(Relation rel, const char *stmt)
4474 : {
4475 : int expected_refcnt;
4476 :
4477 115235 : expected_refcnt = rel->rd_isnailed ? 2 : 1;
4478 115235 : if (rel->rd_refcnt != expected_refcnt)
4479 28 : ereport(ERROR,
4480 : (errcode(ERRCODE_OBJECT_IN_USE),
4481 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4482 : errmsg("cannot %s \"%s\" because it is being used by active queries in this session",
4483 : stmt, RelationGetRelationName(rel))));
4484 :
4485 115207 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
4486 188663 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
4487 93584 : AfterTriggerPendingOnRel(RelationGetRelid(rel)))
4488 12 : ereport(ERROR,
4489 : (errcode(ERRCODE_OBJECT_IN_USE),
4490 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4491 : errmsg("cannot %s \"%s\" because it has pending trigger events",
4492 : stmt, RelationGetRelationName(rel))));
4493 115195 : }
4494 :
4495 : /*
4496 : * CheckAlterTableIsSafe
4497 : * Verify that it's safe to allow ALTER TABLE on this relation.
4498 : *
4499 : * This consists of CheckTableNotInUse() plus a check that the relation
4500 : * isn't another session's temp table. We must split out the temp-table
4501 : * check because there are callers of CheckTableNotInUse() that don't want
4502 : * that, notably DROP TABLE. (We must allow DROP or we couldn't clean out
4503 : * an orphaned temp schema.) Compare truncate_check_activity().
4504 : */
4505 : static void
4506 40902 : CheckAlterTableIsSafe(Relation rel)
4507 : {
4508 : /*
4509 : * Don't allow ALTER on temp tables of other backends. Their local buffer
4510 : * manager is not going to cope if we need to change the table's contents.
4511 : * Even if we don't, there may be optimizations that assume temp tables
4512 : * aren't subject to such interference.
4513 : */
4514 40902 : if (RELATION_IS_OTHER_TEMP(rel))
4515 0 : ereport(ERROR,
4516 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4517 : errmsg("cannot alter temporary tables of other sessions")));
4518 :
4519 : /*
4520 : * Also check for active uses of the relation in the current transaction,
4521 : * including open scans and pending AFTER trigger events.
4522 : */
4523 40902 : CheckTableNotInUse(rel, "ALTER TABLE");
4524 40878 : }
4525 :
4526 : /*
4527 : * AlterTableLookupRelation
4528 : * Look up, and lock, the OID for the relation named by an alter table
4529 : * statement.
4530 : */
4531 : Oid
4532 21697 : AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
4533 : {
4534 43329 : return RangeVarGetRelidExtended(stmt->relation, lockmode,
4535 21697 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4536 : RangeVarCallbackForAlterRelation,
4537 : stmt);
4538 : }
4539 :
4540 : /*
4541 : * AlterTable
4542 : * Execute ALTER TABLE, which can be a list of subcommands
4543 : *
4544 : * ALTER TABLE is performed in three phases:
4545 : * 1. Examine subcommands and perform pre-transformation checking.
4546 : * 2. Validate and transform subcommands, and update system catalogs.
4547 : * 3. Scan table(s) to check new constraints, and optionally recopy
4548 : * the data into new table(s).
4549 : * Phase 3 is not performed unless one or more of the subcommands requires
4550 : * it. The intention of this design is to allow multiple independent
4551 : * updates of the table schema to be performed with only one pass over the
4552 : * data.
4553 : *
4554 : * ATPrepCmd performs phase 1. A "work queue" entry is created for
4555 : * each table to be affected (there may be multiple affected tables if the
4556 : * commands traverse a table inheritance hierarchy). Also we do preliminary
4557 : * validation of the subcommands. Because earlier subcommands may change
4558 : * the catalog state seen by later commands, there are limits to what can
4559 : * be done in this phase. Generally, this phase acquires table locks,
4560 : * checks permissions and relkind, and recurses to find child tables.
4561 : *
4562 : * ATRewriteCatalogs performs phase 2 for each affected table.
4563 : * Certain subcommands need to be performed before others to avoid
4564 : * unnecessary conflicts; for example, DROP COLUMN should come before
4565 : * ADD COLUMN. Therefore phase 1 divides the subcommands into multiple
4566 : * lists, one for each logical "pass" of phase 2.
4567 : *
4568 : * ATRewriteTables performs phase 3 for those tables that need it.
4569 : *
4570 : * For most subcommand types, phases 2 and 3 do no explicit recursion,
4571 : * since phase 1 already does it. However, for certain subcommand types
4572 : * it is only possible to determine how to recurse at phase 2 time; for
4573 : * those cases, phase 1 sets the cmd->recurse flag.
4574 : *
4575 : * Thanks to the magic of MVCC, an error anywhere along the way rolls back
4576 : * the whole operation; we don't have to do anything special to clean up.
4577 : *
4578 : * The caller must lock the relation, with an appropriate lock level
4579 : * for the subcommands requested, using AlterTableGetLockLevel(stmt->cmds)
4580 : * or higher. We pass the lock level down
4581 : * so that we can apply it recursively to inherited tables. Note that the
4582 : * lock level we want as we recurse might well be higher than required for
4583 : * that specific subcommand. So we pass down the overall lock requirement,
4584 : * rather than reassess it at lower levels.
4585 : *
4586 : * The caller also provides a "context" which is to be passed back to
4587 : * utility.c when we need to execute a subcommand such as CREATE INDEX.
4588 : * Some of the fields therein, such as the relid, are used here as well.
4589 : */
4590 : void
4591 21524 : AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
4592 : AlterTableUtilityContext *context)
4593 : {
4594 : Relation rel;
4595 :
4596 : /* Caller is required to provide an adequate lock. */
4597 21524 : rel = relation_open(context->relid, NoLock);
4598 :
4599 21524 : CheckAlterTableIsSafe(rel);
4600 :
4601 21512 : ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
4602 18631 : }
4603 :
4604 : /*
4605 : * AlterTableInternal
4606 : *
4607 : * ALTER TABLE with target specified by OID
4608 : *
4609 : * We do not reject if the relation is already open, because it's quite
4610 : * likely that one or more layers of caller have it open. That means it
4611 : * is unsafe to use this entry point for alterations that could break
4612 : * existing query plans. On the assumption it's not used for such, we
4613 : * don't have to reject pending AFTER triggers, either.
4614 : *
4615 : * Also, since we don't have an AlterTableUtilityContext, this cannot be
4616 : * used for any subcommand types that require parse transformation or
4617 : * could generate subcommands that have to be passed to ProcessUtility.
4618 : */
4619 : void
4620 188 : AlterTableInternal(Oid relid, List *cmds, bool recurse)
4621 : {
4622 : Relation rel;
4623 188 : LOCKMODE lockmode = AlterTableGetLockLevel(cmds);
4624 :
4625 188 : rel = relation_open(relid, lockmode);
4626 :
4627 188 : EventTriggerAlterTableRelid(relid);
4628 :
4629 188 : ATController(NULL, rel, cmds, recurse, lockmode, NULL);
4630 188 : }
4631 :
4632 : /*
4633 : * AlterTableGetLockLevel
4634 : *
4635 : * Sets the overall lock level required for the supplied list of subcommands.
4636 : * Policy for doing this set according to needs of AlterTable(), see
4637 : * comments there for overall explanation.
4638 : *
4639 : * Function is called before and after parsing, so it must give same
4640 : * answer each time it is called. Some subcommands are transformed
4641 : * into other subcommand types, so the transform must never be made to a
4642 : * lower lock level than previously assigned. All transforms are noted below.
4643 : *
4644 : * Since this is called before we lock the table we cannot use table metadata
4645 : * to influence the type of lock we acquire.
4646 : *
4647 : * There should be no lockmodes hardcoded into the subcommand functions. All
4648 : * lockmode decisions for ALTER TABLE are made here only. The one exception is
4649 : * ALTER TABLE RENAME which is treated as a different statement type T_RenameStmt
4650 : * and does not travel through this section of code and cannot be combined with
4651 : * any of the subcommands given here.
4652 : *
4653 : * Note that Hot Standby only knows about AccessExclusiveLocks on the primary
4654 : * so any changes that might affect SELECTs running on standbys need to use
4655 : * AccessExclusiveLocks even if you think a lesser lock would do, unless you
4656 : * have a solution for that also.
4657 : *
4658 : * Also note that pg_dump uses only an AccessShareLock, meaning that anything
4659 : * that takes a lock less than AccessExclusiveLock can change object definitions
4660 : * while pg_dump is running. Be careful to check that the appropriate data is
4661 : * derived by pg_dump using an MVCC snapshot, rather than syscache lookups,
4662 : * otherwise we might end up with an inconsistent dump that can't restore.
4663 : */
4664 : LOCKMODE
4665 21885 : AlterTableGetLockLevel(List *cmds)
4666 : {
4667 : /*
4668 : * This only works if we read catalog tables using MVCC snapshots.
4669 : */
4670 : ListCell *lcmd;
4671 21885 : LOCKMODE lockmode = ShareUpdateExclusiveLock;
4672 :
4673 44632 : foreach(lcmd, cmds)
4674 : {
4675 22747 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4676 22747 : LOCKMODE cmd_lockmode = AccessExclusiveLock; /* default for compiler */
4677 :
4678 22747 : switch (cmd->subtype)
4679 : {
4680 : /*
4681 : * These subcommands rewrite the heap, so require full locks.
4682 : */
4683 2645 : case AT_AddColumn: /* may rewrite heap, in some cases and visible
4684 : * to SELECT */
4685 : case AT_SetAccessMethod: /* must rewrite heap */
4686 : case AT_SetTableSpace: /* must rewrite heap */
4687 : case AT_AlterColumnType: /* must rewrite heap */
4688 2645 : cmd_lockmode = AccessExclusiveLock;
4689 2645 : break;
4690 :
4691 : /*
4692 : * These subcommands may require addition of toast tables. If
4693 : * we add a toast table to a table currently being scanned, we
4694 : * might miss data added to the new toast table by concurrent
4695 : * insert transactions.
4696 : */
4697 159 : case AT_SetStorage: /* may add toast tables, see
4698 : * ATRewriteCatalogs() */
4699 159 : cmd_lockmode = AccessExclusiveLock;
4700 159 : break;
4701 :
4702 : /*
4703 : * Removing constraints can affect SELECTs that have been
4704 : * optimized assuming the constraint holds true. See also
4705 : * CloneFkReferenced.
4706 : */
4707 787 : case AT_DropConstraint: /* as DROP INDEX */
4708 : case AT_DropNotNull: /* may change some SQL plans */
4709 787 : cmd_lockmode = AccessExclusiveLock;
4710 787 : break;
4711 :
4712 : /*
4713 : * Subcommands that may be visible to concurrent SELECTs
4714 : */
4715 1221 : case AT_DropColumn: /* change visible to SELECT */
4716 : case AT_AddColumnToView: /* CREATE VIEW */
4717 : case AT_DropOids: /* used to equiv to DropColumn */
4718 : case AT_EnableAlwaysRule: /* may change SELECT rules */
4719 : case AT_EnableReplicaRule: /* may change SELECT rules */
4720 : case AT_EnableRule: /* may change SELECT rules */
4721 : case AT_DisableRule: /* may change SELECT rules */
4722 1221 : cmd_lockmode = AccessExclusiveLock;
4723 1221 : break;
4724 :
4725 : /*
4726 : * Changing owner may remove implicit SELECT privileges
4727 : */
4728 1157 : case AT_ChangeOwner: /* change visible to SELECT */
4729 1157 : cmd_lockmode = AccessExclusiveLock;
4730 1157 : break;
4731 :
4732 : /*
4733 : * Changing foreign table options may affect optimization.
4734 : */
4735 143 : case AT_GenericOptions:
4736 : case AT_AlterColumnGenericOptions:
4737 143 : cmd_lockmode = AccessExclusiveLock;
4738 143 : break;
4739 :
4740 : /*
4741 : * These subcommands affect write operations only.
4742 : */
4743 191 : case AT_EnableTrig:
4744 : case AT_EnableAlwaysTrig:
4745 : case AT_EnableReplicaTrig:
4746 : case AT_EnableTrigAll:
4747 : case AT_EnableTrigUser:
4748 : case AT_DisableTrig:
4749 : case AT_DisableTrigAll:
4750 : case AT_DisableTrigUser:
4751 191 : cmd_lockmode = ShareRowExclusiveLock;
4752 191 : break;
4753 :
4754 : /*
4755 : * These subcommands affect write operations only. XXX
4756 : * Theoretically, these could be ShareRowExclusiveLock.
4757 : */
4758 2056 : case AT_ColumnDefault:
4759 : case AT_CookedColumnDefault:
4760 : case AT_AlterConstraint:
4761 : case AT_AddIndex: /* from ADD CONSTRAINT */
4762 : case AT_AddIndexConstraint:
4763 : case AT_ReplicaIdentity:
4764 : case AT_SetNotNull:
4765 : case AT_EnableRowSecurity:
4766 : case AT_DisableRowSecurity:
4767 : case AT_ForceRowSecurity:
4768 : case AT_NoForceRowSecurity:
4769 : case AT_AddIdentity:
4770 : case AT_DropIdentity:
4771 : case AT_SetIdentity:
4772 : case AT_SetExpression:
4773 : case AT_DropExpression:
4774 : case AT_SetCompression:
4775 2056 : cmd_lockmode = AccessExclusiveLock;
4776 2056 : break;
4777 :
4778 10076 : case AT_AddConstraint:
4779 : case AT_ReAddConstraint: /* becomes AT_AddConstraint */
4780 : case AT_ReAddDomainConstraint: /* becomes AT_AddConstraint */
4781 10076 : if (IsA(cmd->def, Constraint))
4782 : {
4783 10076 : Constraint *con = (Constraint *) cmd->def;
4784 :
4785 10076 : switch (con->contype)
4786 : {
4787 7459 : case CONSTR_EXCLUSION:
4788 : case CONSTR_PRIMARY:
4789 : case CONSTR_UNIQUE:
4790 :
4791 : /*
4792 : * Cases essentially the same as CREATE INDEX. We
4793 : * could reduce the lock strength to ShareLock if
4794 : * we can work out how to allow concurrent catalog
4795 : * updates. XXX Might be set down to
4796 : * ShareRowExclusiveLock but requires further
4797 : * analysis.
4798 : */
4799 7459 : cmd_lockmode = AccessExclusiveLock;
4800 7459 : break;
4801 1782 : case CONSTR_FOREIGN:
4802 :
4803 : /*
4804 : * We add triggers to both tables when we add a
4805 : * Foreign Key, so the lock level must be at least
4806 : * as strong as CREATE TRIGGER.
4807 : */
4808 1782 : cmd_lockmode = ShareRowExclusiveLock;
4809 1782 : break;
4810 :
4811 835 : default:
4812 835 : cmd_lockmode = AccessExclusiveLock;
4813 : }
4814 : }
4815 10076 : break;
4816 :
4817 : /*
4818 : * These subcommands affect inheritance behaviour. Queries
4819 : * started before us will continue to see the old inheritance
4820 : * behaviour, while queries started after we commit will see
4821 : * new behaviour. No need to prevent reads or writes to the
4822 : * subtable while we hook it up though. Changing the TupDesc
4823 : * may be a problem, so keep highest lock.
4824 : */
4825 386 : case AT_AddInherit:
4826 : case AT_DropInherit:
4827 386 : cmd_lockmode = AccessExclusiveLock;
4828 386 : break;
4829 :
4830 : /*
4831 : * These subcommands affect implicit row type conversion. They
4832 : * have affects similar to CREATE/DROP CAST on queries. don't
4833 : * provide for invalidating parse trees as a result of such
4834 : * changes, so we keep these at AccessExclusiveLock.
4835 : */
4836 46 : case AT_AddOf:
4837 : case AT_DropOf:
4838 46 : cmd_lockmode = AccessExclusiveLock;
4839 46 : break;
4840 :
4841 : /*
4842 : * Only used by CREATE OR REPLACE VIEW which must conflict
4843 : * with an SELECTs currently using the view.
4844 : */
4845 137 : case AT_ReplaceRelOptions:
4846 137 : cmd_lockmode = AccessExclusiveLock;
4847 137 : break;
4848 :
4849 : /*
4850 : * These subcommands affect general strategies for performance
4851 : * and maintenance, though don't change the semantic results
4852 : * from normal data reads and writes. Delaying an ALTER TABLE
4853 : * behind currently active writes only delays the point where
4854 : * the new strategy begins to take effect, so there is no
4855 : * benefit in waiting. In this case the minimum restriction
4856 : * applies: we don't currently allow concurrent catalog
4857 : * updates.
4858 : */
4859 158 : case AT_SetStatistics: /* Uses MVCC in getTableAttrs() */
4860 : case AT_ClusterOn: /* Uses MVCC in getIndexes() */
4861 : case AT_DropCluster: /* Uses MVCC in getIndexes() */
4862 : case AT_SetOptions: /* Uses MVCC in getTableAttrs() */
4863 : case AT_ResetOptions: /* Uses MVCC in getTableAttrs() */
4864 158 : cmd_lockmode = ShareUpdateExclusiveLock;
4865 158 : break;
4866 :
4867 75 : case AT_SetLogged:
4868 : case AT_SetUnLogged:
4869 75 : cmd_lockmode = AccessExclusiveLock;
4870 75 : break;
4871 :
4872 275 : case AT_ValidateConstraint: /* Uses MVCC in getConstraints() */
4873 275 : cmd_lockmode = ShareUpdateExclusiveLock;
4874 275 : break;
4875 :
4876 : /*
4877 : * Rel options are more complex than first appears. Options
4878 : * are set here for tables, views and indexes; for historical
4879 : * reasons these can all be used with ALTER TABLE, so we can't
4880 : * decide between them using the basic grammar.
4881 : */
4882 497 : case AT_SetRelOptions: /* Uses MVCC in getIndexes() and
4883 : * getTables() */
4884 : case AT_ResetRelOptions: /* Uses MVCC in getIndexes() and
4885 : * getTables() */
4886 497 : cmd_lockmode = AlterTableGetRelOptionsLockLevel((List *) cmd->def);
4887 497 : break;
4888 :
4889 1901 : case AT_AttachPartition:
4890 1901 : cmd_lockmode = ShareUpdateExclusiveLock;
4891 1901 : break;
4892 :
4893 385 : case AT_DetachPartition:
4894 385 : if (((PartitionCmd *) cmd->def)->concurrent)
4895 87 : cmd_lockmode = ShareUpdateExclusiveLock;
4896 : else
4897 298 : cmd_lockmode = AccessExclusiveLock;
4898 385 : break;
4899 :
4900 11 : case AT_DetachPartitionFinalize:
4901 11 : cmd_lockmode = ShareUpdateExclusiveLock;
4902 11 : break;
4903 :
4904 441 : case AT_MergePartitions:
4905 : case AT_SplitPartition:
4906 441 : cmd_lockmode = AccessExclusiveLock;
4907 441 : break;
4908 :
4909 0 : default: /* oops */
4910 0 : elog(ERROR, "unrecognized alter table type: %d",
4911 : (int) cmd->subtype);
4912 : break;
4913 : }
4914 :
4915 : /*
4916 : * Take the greatest lockmode from any subcommand
4917 : */
4918 22747 : if (cmd_lockmode > lockmode)
4919 19074 : lockmode = cmd_lockmode;
4920 : }
4921 :
4922 21885 : return lockmode;
4923 : }
4924 :
4925 : /*
4926 : * ATController provides top level control over the phases.
4927 : *
4928 : * parsetree is passed in to allow it to be passed to event triggers
4929 : * when requested.
4930 : */
4931 : static void
4932 21700 : ATController(AlterTableStmt *parsetree,
4933 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
4934 : AlterTableUtilityContext *context)
4935 : {
4936 21700 : List *wqueue = NIL;
4937 : ListCell *lcmd;
4938 :
4939 : /* Phase 1: preliminary examination of commands, create work queue */
4940 43961 : foreach(lcmd, cmds)
4941 : {
4942 22558 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4943 :
4944 22558 : ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode, context);
4945 : }
4946 :
4947 : /* Close the relation, but keep lock until commit */
4948 21403 : relation_close(rel, NoLock);
4949 :
4950 : /* Phase 2: update system catalogs */
4951 21403 : ATRewriteCatalogs(&wqueue, lockmode, context);
4952 :
4953 : /* Phase 3: scan/rewrite tables as needed, and run afterStmts */
4954 19224 : ATRewriteTables(parsetree, &wqueue, lockmode, context);
4955 18819 : }
4956 :
4957 : /*
4958 : * ATPrepCmd
4959 : *
4960 : * Traffic cop for ALTER TABLE Phase 1 operations, including simple
4961 : * recursion and permission checks.
4962 : *
4963 : * Caller must have acquired appropriate lock type on relation already.
4964 : * This lock should be held until commit.
4965 : */
4966 : static void
4967 23177 : ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
4968 : bool recurse, bool recursing, LOCKMODE lockmode,
4969 : AlterTableUtilityContext *context)
4970 : {
4971 : AlteredTableInfo *tab;
4972 23177 : AlterTablePass pass = AT_PASS_UNSET;
4973 :
4974 : /* Find or create work queue entry for this table */
4975 23177 : tab = ATGetQueueEntry(wqueue, rel);
4976 :
4977 : /*
4978 : * Disallow any ALTER TABLE other than ALTER TABLE DETACH FINALIZE on
4979 : * partitions that are pending detach.
4980 : */
4981 23177 : if (rel->rd_rel->relispartition &&
4982 1806 : cmd->subtype != AT_DetachPartitionFinalize &&
4983 903 : PartitionHasPendingDetach(RelationGetRelid(rel)))
4984 1 : ereport(ERROR,
4985 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
4986 : errmsg("cannot alter partition \"%s\" with an incomplete detach",
4987 : RelationGetRelationName(rel)),
4988 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
4989 :
4990 : /*
4991 : * Copy the original subcommand for each table, so we can scribble on it.
4992 : * This avoids conflicts when different child tables need to make
4993 : * different parse transformations (for example, the same column may have
4994 : * different column numbers in different children).
4995 : */
4996 23176 : cmd = copyObject(cmd);
4997 :
4998 : /*
4999 : * Do permissions and relkind checking, recursion to child tables if
5000 : * needed, and any additional phase-1 processing needed. (But beware of
5001 : * adding any processing that looks at table details that another
5002 : * subcommand could change. In some cases we reject multiple subcommands
5003 : * that could try to change the same state in contrary ways.)
5004 : */
5005 23176 : switch (cmd->subtype)
5006 : {
5007 1617 : case AT_AddColumn: /* ADD COLUMN */
5008 1617 : ATSimplePermissions(cmd->subtype, rel,
5009 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5010 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5011 1617 : ATPrepAddColumn(wqueue, rel, recurse, recursing, false, cmd,
5012 : lockmode, context);
5013 : /* Recursion occurs during execution phase */
5014 1609 : pass = AT_PASS_ADD_COL;
5015 1609 : break;
5016 21 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
5017 21 : ATSimplePermissions(cmd->subtype, rel, ATT_VIEW);
5018 21 : ATPrepAddColumn(wqueue, rel, recurse, recursing, true, cmd,
5019 : lockmode, context);
5020 : /* Recursion occurs during execution phase */
5021 21 : pass = AT_PASS_ADD_COL;
5022 21 : break;
5023 407 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
5024 :
5025 : /*
5026 : * We allow defaults on views so that INSERT into a view can have
5027 : * default-ish behavior. This works because the rewriter
5028 : * substitutes default values into INSERTs before it expands
5029 : * rules.
5030 : */
5031 407 : ATSimplePermissions(cmd->subtype, rel,
5032 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5033 : ATT_FOREIGN_TABLE);
5034 407 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5035 : /* No command-specific prep needed */
5036 407 : pass = cmd->def ? AT_PASS_ADD_OTHERCONSTR : AT_PASS_DROP;
5037 407 : break;
5038 53 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5039 : /* This is currently used only in CREATE TABLE */
5040 : /* (so the permission check really isn't necessary) */
5041 53 : ATSimplePermissions(cmd->subtype, rel,
5042 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5043 : /* This command never recurses */
5044 53 : pass = AT_PASS_ADD_OTHERCONSTR;
5045 53 : break;
5046 107 : case AT_AddIdentity:
5047 107 : ATSimplePermissions(cmd->subtype, rel,
5048 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5049 : ATT_FOREIGN_TABLE);
5050 : /* Set up recursion for phase 2; no other prep needed */
5051 107 : if (recurse)
5052 103 : cmd->recurse = true;
5053 107 : pass = AT_PASS_ADD_OTHERCONSTR;
5054 107 : break;
5055 41 : case AT_SetIdentity:
5056 41 : ATSimplePermissions(cmd->subtype, rel,
5057 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5058 : ATT_FOREIGN_TABLE);
5059 : /* Set up recursion for phase 2; no other prep needed */
5060 41 : if (recurse)
5061 37 : cmd->recurse = true;
5062 : /* This should run after AddIdentity, so do it in MISC pass */
5063 41 : pass = AT_PASS_MISC;
5064 41 : break;
5065 37 : case AT_DropIdentity:
5066 37 : ATSimplePermissions(cmd->subtype, rel,
5067 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5068 : ATT_FOREIGN_TABLE);
5069 : /* Set up recursion for phase 2; no other prep needed */
5070 37 : if (recurse)
5071 33 : cmd->recurse = true;
5072 37 : pass = AT_PASS_DROP;
5073 37 : break;
5074 181 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5075 181 : ATSimplePermissions(cmd->subtype, rel,
5076 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5077 : /* Set up recursion for phase 2; no other prep needed */
5078 177 : if (recurse)
5079 165 : cmd->recurse = true;
5080 177 : pass = AT_PASS_DROP;
5081 177 : break;
5082 276 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5083 276 : ATSimplePermissions(cmd->subtype, rel,
5084 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5085 : /* Set up recursion for phase 2; no other prep needed */
5086 272 : if (recurse)
5087 252 : cmd->recurse = true;
5088 272 : pass = AT_PASS_COL_ATTRS;
5089 272 : break;
5090 169 : case AT_SetExpression: /* ALTER COLUMN SET EXPRESSION */
5091 169 : ATSimplePermissions(cmd->subtype, rel,
5092 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5093 169 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5094 169 : pass = AT_PASS_SET_EXPRESSION;
5095 169 : break;
5096 57 : case AT_DropExpression: /* ALTER COLUMN DROP EXPRESSION */
5097 57 : ATSimplePermissions(cmd->subtype, rel,
5098 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5099 57 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5100 57 : ATPrepDropExpression(rel, cmd, recurse, recursing, lockmode);
5101 41 : pass = AT_PASS_DROP;
5102 41 : break;
5103 111 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5104 111 : ATSimplePermissions(cmd->subtype, rel,
5105 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW |
5106 : ATT_INDEX | ATT_PARTITIONED_INDEX | ATT_FOREIGN_TABLE);
5107 111 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5108 : /* No command-specific prep needed */
5109 111 : pass = AT_PASS_MISC;
5110 111 : break;
5111 29 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5112 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5113 29 : ATSimplePermissions(cmd->subtype, rel,
5114 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5115 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5116 : /* This command never recurses */
5117 21 : pass = AT_PASS_MISC;
5118 21 : break;
5119 173 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5120 173 : ATSimplePermissions(cmd->subtype, rel,
5121 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5122 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5123 173 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5124 : /* No command-specific prep needed */
5125 173 : pass = AT_PASS_MISC;
5126 173 : break;
5127 48 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5128 48 : ATSimplePermissions(cmd->subtype, rel,
5129 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5130 : /* This command never recurses */
5131 : /* No command-specific prep needed */
5132 48 : pass = AT_PASS_MISC;
5133 48 : break;
5134 1147 : case AT_DropColumn: /* DROP COLUMN */
5135 1147 : ATSimplePermissions(cmd->subtype, rel,
5136 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5137 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5138 1143 : ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd,
5139 : lockmode, context);
5140 : /* Recursion occurs during execution phase */
5141 1135 : pass = AT_PASS_DROP;
5142 1135 : break;
5143 0 : case AT_AddIndex: /* ADD INDEX */
5144 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5145 : /* This command never recurses */
5146 : /* No command-specific prep needed */
5147 0 : pass = AT_PASS_ADD_INDEX;
5148 0 : break;
5149 10373 : case AT_AddConstraint: /* ADD CONSTRAINT */
5150 10373 : ATSimplePermissions(cmd->subtype, rel,
5151 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5152 10373 : ATPrepAddPrimaryKey(wqueue, rel, cmd, recurse, lockmode, context);
5153 10353 : if (recurse)
5154 : {
5155 : /* recurses at exec time; lock descendants and set flag */
5156 10119 : (void) find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
5157 10119 : cmd->recurse = true;
5158 : }
5159 10353 : pass = AT_PASS_ADD_CONSTR;
5160 10353 : break;
5161 0 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5162 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5163 : /* This command never recurses */
5164 : /* No command-specific prep needed */
5165 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5166 0 : break;
5167 581 : case AT_DropConstraint: /* DROP CONSTRAINT */
5168 581 : ATSimplePermissions(cmd->subtype, rel,
5169 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5170 581 : ATCheckPartitionsNotInUse(rel, lockmode);
5171 : /* Other recursion occurs during execution phase */
5172 : /* No command-specific prep needed except saving recurse flag */
5173 577 : if (recurse)
5174 553 : cmd->recurse = true;
5175 577 : pass = AT_PASS_DROP;
5176 577 : break;
5177 951 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5178 951 : ATSimplePermissions(cmd->subtype, rel,
5179 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5180 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5181 : /* See comments for ATPrepAlterColumnType */
5182 951 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, recurse, lockmode,
5183 : AT_PASS_UNSET, context);
5184 : Assert(cmd != NULL);
5185 : /* Performs own recursion */
5186 947 : ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd,
5187 : lockmode, context);
5188 816 : pass = AT_PASS_ALTER_TYPE;
5189 816 : break;
5190 94 : case AT_AlterColumnGenericOptions:
5191 94 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5192 : /* This command never recurses */
5193 : /* No command-specific prep needed */
5194 94 : pass = AT_PASS_MISC;
5195 94 : break;
5196 1141 : case AT_ChangeOwner: /* ALTER OWNER */
5197 : /* This command never recurses */
5198 : /* No command-specific prep needed */
5199 1141 : pass = AT_PASS_MISC;
5200 1141 : break;
5201 43 : case AT_ClusterOn: /* CLUSTER ON */
5202 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5203 43 : ATSimplePermissions(cmd->subtype, rel,
5204 : ATT_TABLE | ATT_MATVIEW);
5205 : /* These commands never recurse */
5206 : /* No command-specific prep needed */
5207 35 : pass = AT_PASS_MISC;
5208 35 : break;
5209 75 : case AT_SetLogged: /* SET LOGGED */
5210 : case AT_SetUnLogged: /* SET UNLOGGED */
5211 75 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
5212 67 : if (tab->chgPersistence)
5213 0 : ereport(ERROR,
5214 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5215 : errmsg("cannot change persistence setting twice")));
5216 67 : ATPrepChangePersistence(tab, rel, cmd->subtype == AT_SetLogged);
5217 59 : pass = AT_PASS_MISC;
5218 59 : break;
5219 4 : case AT_DropOids: /* SET WITHOUT OIDS */
5220 4 : ATSimplePermissions(cmd->subtype, rel,
5221 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5222 4 : pass = AT_PASS_DROP;
5223 4 : break;
5224 85 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5225 85 : ATSimplePermissions(cmd->subtype, rel,
5226 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5227 :
5228 : /* check if another access method change was already requested */
5229 85 : if (tab->chgAccessMethod)
5230 12 : ereport(ERROR,
5231 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5232 : errmsg("cannot have multiple SET ACCESS METHOD subcommands")));
5233 :
5234 73 : ATPrepSetAccessMethod(tab, rel, cmd->name);
5235 73 : pass = AT_PASS_MISC; /* does not matter; no work in Phase 2 */
5236 73 : break;
5237 98 : case AT_SetTableSpace: /* SET TABLESPACE */
5238 98 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE |
5239 : ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX);
5240 : /* This command never recurses */
5241 98 : ATPrepSetTableSpace(tab, rel, cmd->name, lockmode);
5242 98 : pass = AT_PASS_MISC; /* doesn't actually matter */
5243 98 : break;
5244 633 : case AT_SetRelOptions: /* SET (...) */
5245 : case AT_ResetRelOptions: /* RESET (...) */
5246 : case AT_ReplaceRelOptions: /* reset them all, then set just these */
5247 633 : ATSimplePermissions(cmd->subtype, rel,
5248 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5249 : ATT_MATVIEW | ATT_INDEX);
5250 : /* This command never recurses */
5251 : /* No command-specific prep needed */
5252 632 : pass = AT_PASS_MISC;
5253 632 : break;
5254 305 : case AT_AddInherit: /* INHERIT */
5255 305 : ATSimplePermissions(cmd->subtype, rel,
5256 : ATT_TABLE | ATT_FOREIGN_TABLE);
5257 : /* This command never recurses */
5258 301 : ATPrepChangeInherit(rel);
5259 289 : pass = AT_PASS_MISC;
5260 289 : break;
5261 81 : case AT_DropInherit: /* NO INHERIT */
5262 81 : ATSimplePermissions(cmd->subtype, rel,
5263 : ATT_TABLE | ATT_FOREIGN_TABLE);
5264 : /* This command never recurses */
5265 77 : ATPrepChangeInherit(rel);
5266 69 : pass = AT_PASS_MISC;
5267 69 : break;
5268 296 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5269 296 : ATSimplePermissions(cmd->subtype, rel,
5270 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5271 : /* Recursion occurs during execution phase */
5272 292 : if (recurse)
5273 284 : cmd->recurse = true;
5274 292 : pass = AT_PASS_MISC;
5275 292 : break;
5276 275 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5277 275 : ATSimplePermissions(cmd->subtype, rel,
5278 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5279 : /* Recursion occurs during execution phase */
5280 : /* No command-specific prep needed except saving recurse flag */
5281 275 : if (recurse)
5282 275 : cmd->recurse = true;
5283 275 : pass = AT_PASS_MISC;
5284 275 : break;
5285 310 : case AT_ReplicaIdentity: /* REPLICA IDENTITY ... */
5286 310 : ATSimplePermissions(cmd->subtype, rel,
5287 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5288 310 : pass = AT_PASS_MISC;
5289 : /* This command never recurses */
5290 : /* No command-specific prep needed */
5291 310 : break;
5292 191 : case AT_EnableTrig: /* ENABLE TRIGGER variants */
5293 : case AT_EnableAlwaysTrig:
5294 : case AT_EnableReplicaTrig:
5295 : case AT_EnableTrigAll:
5296 : case AT_EnableTrigUser:
5297 : case AT_DisableTrig: /* DISABLE TRIGGER variants */
5298 : case AT_DisableTrigAll:
5299 : case AT_DisableTrigUser:
5300 191 : ATSimplePermissions(cmd->subtype, rel,
5301 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5302 : /* Set up recursion for phase 2; no other prep needed */
5303 191 : if (recurse)
5304 174 : cmd->recurse = true;
5305 191 : pass = AT_PASS_MISC;
5306 191 : break;
5307 411 : case AT_EnableRule: /* ENABLE/DISABLE RULE variants */
5308 : case AT_EnableAlwaysRule:
5309 : case AT_EnableReplicaRule:
5310 : case AT_DisableRule:
5311 : case AT_AddOf: /* OF */
5312 : case AT_DropOf: /* NOT OF */
5313 : case AT_EnableRowSecurity:
5314 : case AT_DisableRowSecurity:
5315 : case AT_ForceRowSecurity:
5316 : case AT_NoForceRowSecurity:
5317 411 : ATSimplePermissions(cmd->subtype, rel,
5318 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5319 : /* These commands never recurse */
5320 : /* No command-specific prep needed */
5321 411 : pass = AT_PASS_MISC;
5322 411 : break;
5323 33 : case AT_GenericOptions:
5324 33 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5325 : /* No command-specific prep needed */
5326 33 : pass = AT_PASS_MISC;
5327 33 : break;
5328 1893 : case AT_AttachPartition:
5329 1893 : ATSimplePermissions(cmd->subtype, rel,
5330 : ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
5331 : /* No command-specific prep needed */
5332 1889 : pass = AT_PASS_MISC;
5333 1889 : break;
5334 385 : case AT_DetachPartition:
5335 385 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5336 : /* No command-specific prep needed */
5337 373 : pass = AT_PASS_MISC;
5338 373 : break;
5339 11 : case AT_DetachPartitionFinalize:
5340 11 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5341 : /* No command-specific prep needed */
5342 7 : pass = AT_PASS_MISC;
5343 7 : break;
5344 433 : case AT_MergePartitions:
5345 : case AT_SplitPartition:
5346 433 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5347 : /* No command-specific prep needed */
5348 429 : pass = AT_PASS_MISC;
5349 429 : break;
5350 0 : default: /* oops */
5351 0 : elog(ERROR, "unrecognized alter table type: %d",
5352 : (int) cmd->subtype);
5353 : pass = AT_PASS_UNSET; /* keep compiler quiet */
5354 : break;
5355 : }
5356 : Assert(pass > AT_PASS_UNSET);
5357 :
5358 : /* Add the subcommand to the appropriate list for phase 2 */
5359 22872 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd);
5360 22872 : }
5361 :
5362 : /*
5363 : * ATRewriteCatalogs
5364 : *
5365 : * Traffic cop for ALTER TABLE Phase 2 operations. Subcommands are
5366 : * dispatched in a "safe" execution order (designed to avoid unnecessary
5367 : * conflicts).
5368 : */
5369 : static void
5370 21403 : ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
5371 : AlterTableUtilityContext *context)
5372 : {
5373 : ListCell *ltab;
5374 :
5375 : /*
5376 : * We process all the tables "in parallel", one pass at a time. This is
5377 : * needed because we may have to propagate work from one table to another
5378 : * (specifically, ALTER TYPE on a foreign key's PK has to dispatch the
5379 : * re-adding of the foreign key constraint to the other table). Work can
5380 : * only be propagated into later passes, however.
5381 : */
5382 268781 : for (AlterTablePass pass = 0; pass < AT_NUM_PASSES; pass++)
5383 : {
5384 : /* Go through each table that needs to be processed */
5385 508394 : foreach(ltab, *wqueue)
5386 : {
5387 261016 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5388 261016 : List *subcmds = tab->subcmds[pass];
5389 : ListCell *lcmd;
5390 :
5391 261016 : if (subcmds == NIL)
5392 224447 : continue;
5393 :
5394 : /*
5395 : * Open the relation and store it in tab. This allows subroutines
5396 : * close and reopen, if necessary. Appropriate lock was obtained
5397 : * by phase 1, needn't get it again.
5398 : */
5399 36569 : tab->rel = relation_open(tab->relid, NoLock);
5400 :
5401 73349 : foreach(lcmd, subcmds)
5402 38959 : ATExecCmd(wqueue, tab,
5403 38959 : lfirst_node(AlterTableCmd, lcmd),
5404 : lockmode, pass, context);
5405 :
5406 : /*
5407 : * After the ALTER TYPE or SET EXPRESSION pass, do cleanup work
5408 : * (this is not done in ATExecAlterColumnType since it should be
5409 : * done only once if multiple columns of a table are altered).
5410 : */
5411 34390 : if (pass == AT_PASS_ALTER_TYPE || pass == AT_PASS_SET_EXPRESSION)
5412 889 : ATPostAlterTypeCleanup(wqueue, tab, lockmode);
5413 :
5414 34390 : if (tab->rel)
5415 : {
5416 34390 : relation_close(tab->rel, NoLock);
5417 34390 : tab->rel = NULL;
5418 : }
5419 : }
5420 : }
5421 :
5422 : /* Check to see if a toast table must be added. */
5423 41494 : foreach(ltab, *wqueue)
5424 : {
5425 22270 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5426 :
5427 : /*
5428 : * If the table is source table of ATTACH PARTITION command, we did
5429 : * not modify anything about it that will change its toasting
5430 : * requirement, so no need to check.
5431 : */
5432 22270 : if (((tab->relkind == RELKIND_RELATION ||
5433 4328 : tab->relkind == RELKIND_PARTITIONED_TABLE) &&
5434 21042 : tab->partition_constraint == NULL) ||
5435 2631 : tab->relkind == RELKIND_MATVIEW)
5436 19668 : AlterTableCreateToastTable(tab->relid, (Datum) 0, lockmode);
5437 : }
5438 19224 : }
5439 :
5440 : /*
5441 : * ATExecCmd: dispatch a subcommand to appropriate execution routine
5442 : */
5443 : static void
5444 38959 : ATExecCmd(List **wqueue, AlteredTableInfo *tab,
5445 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
5446 : AlterTableUtilityContext *context)
5447 : {
5448 38959 : ObjectAddress address = InvalidObjectAddress;
5449 38959 : Relation rel = tab->rel;
5450 :
5451 38959 : switch (cmd->subtype)
5452 : {
5453 1626 : case AT_AddColumn: /* ADD COLUMN */
5454 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
5455 1626 : address = ATExecAddColumn(wqueue, tab, rel, &cmd,
5456 1626 : cmd->recurse, false,
5457 : lockmode, cur_pass, context);
5458 1454 : break;
5459 383 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
5460 383 : address = ATExecColumnDefault(rel, cmd->name, cmd->def, lockmode);
5461 339 : break;
5462 53 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5463 53 : address = ATExecCookedColumnDefault(rel, cmd->num, cmd->def);
5464 53 : break;
5465 107 : case AT_AddIdentity:
5466 107 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5467 : cur_pass, context);
5468 : Assert(cmd != NULL);
5469 99 : address = ATExecAddIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5470 63 : break;
5471 41 : case AT_SetIdentity:
5472 41 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5473 : cur_pass, context);
5474 : Assert(cmd != NULL);
5475 41 : address = ATExecSetIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5476 25 : break;
5477 37 : case AT_DropIdentity:
5478 37 : address = ATExecDropIdentity(rel, cmd->name, cmd->missing_ok, lockmode, cmd->recurse, false);
5479 25 : break;
5480 177 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5481 177 : address = ATExecDropNotNull(rel, cmd->name, cmd->recurse, lockmode);
5482 109 : break;
5483 272 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5484 272 : address = ATExecSetNotNull(wqueue, rel, NULL, cmd->name,
5485 272 : cmd->recurse, false, lockmode);
5486 252 : break;
5487 169 : case AT_SetExpression:
5488 169 : address = ATExecSetExpression(tab, rel, cmd->name, cmd->def, lockmode);
5489 157 : break;
5490 37 : case AT_DropExpression:
5491 37 : address = ATExecDropExpression(rel, cmd->name, cmd->missing_ok, lockmode);
5492 21 : break;
5493 111 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5494 111 : address = ATExecSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
5495 79 : break;
5496 17 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5497 17 : address = ATExecSetOptions(rel, cmd->name, cmd->def, false, lockmode);
5498 17 : break;
5499 4 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5500 4 : address = ATExecSetOptions(rel, cmd->name, cmd->def, true, lockmode);
5501 4 : break;
5502 173 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5503 173 : address = ATExecSetStorage(rel, cmd->name, cmd->def, lockmode);
5504 165 : break;
5505 48 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5506 48 : address = ATExecSetCompression(rel, cmd->name, cmd->def,
5507 : lockmode);
5508 44 : break;
5509 1135 : case AT_DropColumn: /* DROP COLUMN */
5510 1135 : address = ATExecDropColumn(wqueue, rel, cmd->name,
5511 1135 : cmd->behavior, cmd->recurse, false,
5512 1135 : cmd->missing_ok, lockmode,
5513 : NULL);
5514 1007 : break;
5515 755 : case AT_AddIndex: /* ADD INDEX */
5516 755 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, false,
5517 : lockmode);
5518 642 : break;
5519 306 : case AT_ReAddIndex: /* ADD INDEX */
5520 306 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, true,
5521 : lockmode);
5522 306 : break;
5523 53 : case AT_ReAddStatistics: /* ADD STATISTICS */
5524 53 : address = ATExecAddStatistics(tab, rel, (CreateStatsStmt *) cmd->def,
5525 : true, lockmode);
5526 53 : break;
5527 18399 : case AT_AddConstraint: /* ADD CONSTRAINT */
5528 : /* Transform the command only during initial examination */
5529 18399 : if (cur_pass == AT_PASS_ADD_CONSTR)
5530 10333 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd,
5531 10353 : cmd->recurse, lockmode,
5532 : cur_pass, context);
5533 : /* Depending on constraint type, might be no more work to do now */
5534 18379 : if (cmd != NULL)
5535 : address =
5536 8046 : ATExecAddConstraint(wqueue, tab, rel,
5537 8046 : (Constraint *) cmd->def,
5538 8046 : cmd->recurse, false, lockmode);
5539 17922 : break;
5540 257 : case AT_ReAddConstraint: /* Re-add pre-existing check constraint */
5541 : address =
5542 257 : ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
5543 : true, true, lockmode);
5544 249 : break;
5545 9 : case AT_ReAddDomainConstraint: /* Re-add pre-existing domain check
5546 : * constraint */
5547 : address =
5548 9 : AlterDomainAddConstraint(((AlterDomainStmt *) cmd->def)->typeName,
5549 9 : ((AlterDomainStmt *) cmd->def)->def,
5550 : NULL);
5551 5 : break;
5552 52 : case AT_ReAddComment: /* Re-add existing comment */
5553 52 : address = CommentObject((CommentStmt *) cmd->def);
5554 52 : break;
5555 6653 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5556 6653 : address = ATExecAddIndexConstraint(tab, rel, (IndexStmt *) cmd->def,
5557 : lockmode);
5558 6645 : break;
5559 292 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5560 292 : address = ATExecAlterConstraint(wqueue, rel,
5561 292 : castNode(ATAlterConstraint, cmd->def),
5562 292 : cmd->recurse, lockmode);
5563 240 : break;
5564 275 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5565 275 : address = ATExecValidateConstraint(wqueue, rel, cmd->name, cmd->recurse,
5566 : false, lockmode);
5567 271 : break;
5568 577 : case AT_DropConstraint: /* DROP CONSTRAINT */
5569 577 : ATExecDropConstraint(rel, cmd->name, cmd->behavior,
5570 577 : cmd->recurse,
5571 577 : cmd->missing_ok, lockmode);
5572 437 : break;
5573 792 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5574 : /* parse transformation was done earlier */
5575 792 : address = ATExecAlterColumnType(tab, rel, cmd, lockmode);
5576 764 : break;
5577 94 : case AT_AlterColumnGenericOptions: /* ALTER COLUMN OPTIONS */
5578 : address =
5579 94 : ATExecAlterColumnGenericOptions(rel, cmd->name,
5580 94 : (List *) cmd->def, lockmode);
5581 90 : break;
5582 1141 : case AT_ChangeOwner: /* ALTER OWNER */
5583 1138 : ATExecChangeOwner(RelationGetRelid(rel),
5584 1141 : get_rolespec_oid(cmd->newowner, false),
5585 : false, lockmode);
5586 1130 : break;
5587 39 : case AT_ClusterOn: /* CLUSTER ON */
5588 39 : address = ATExecClusterOn(rel, cmd->name, lockmode);
5589 39 : break;
5590 8 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5591 8 : ATExecDropCluster(rel, lockmode);
5592 8 : break;
5593 59 : case AT_SetLogged: /* SET LOGGED */
5594 : case AT_SetUnLogged: /* SET UNLOGGED */
5595 59 : break;
5596 4 : case AT_DropOids: /* SET WITHOUT OIDS */
5597 : /* nothing to do here, oid columns don't exist anymore */
5598 4 : break;
5599 61 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5600 :
5601 : /*
5602 : * Only do this for partitioned tables, for which this is just a
5603 : * catalog change. Tables with storage are handled by Phase 3.
5604 : */
5605 61 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
5606 33 : tab->chgAccessMethod)
5607 29 : ATExecSetAccessMethodNoStorage(rel, tab->newAccessMethod);
5608 61 : break;
5609 98 : case AT_SetTableSpace: /* SET TABLESPACE */
5610 :
5611 : /*
5612 : * Only do this for partitioned tables and indexes, for which this
5613 : * is just a catalog change. Other relation types which have
5614 : * storage are handled by Phase 3.
5615 : */
5616 98 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
5617 90 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
5618 24 : ATExecSetTableSpaceNoStorage(rel, tab->newTableSpace);
5619 :
5620 94 : break;
5621 632 : case AT_SetRelOptions: /* SET (...) */
5622 : case AT_ResetRelOptions: /* RESET (...) */
5623 : case AT_ReplaceRelOptions: /* replace entire option list */
5624 632 : ATExecSetRelOptions(rel, (List *) cmd->def, cmd->subtype, lockmode);
5625 598 : break;
5626 65 : case AT_EnableTrig: /* ENABLE TRIGGER name */
5627 65 : ATExecEnableDisableTrigger(rel, cmd->name,
5628 : TRIGGER_FIRES_ON_ORIGIN, false,
5629 65 : cmd->recurse,
5630 : lockmode);
5631 65 : break;
5632 27 : case AT_EnableAlwaysTrig: /* ENABLE ALWAYS TRIGGER name */
5633 27 : ATExecEnableDisableTrigger(rel, cmd->name,
5634 : TRIGGER_FIRES_ALWAYS, false,
5635 27 : cmd->recurse,
5636 : lockmode);
5637 27 : break;
5638 8 : case AT_EnableReplicaTrig: /* ENABLE REPLICA TRIGGER name */
5639 8 : ATExecEnableDisableTrigger(rel, cmd->name,
5640 : TRIGGER_FIRES_ON_REPLICA, false,
5641 8 : cmd->recurse,
5642 : lockmode);
5643 8 : break;
5644 75 : case AT_DisableTrig: /* DISABLE TRIGGER name */
5645 75 : ATExecEnableDisableTrigger(rel, cmd->name,
5646 : TRIGGER_DISABLED, false,
5647 75 : cmd->recurse,
5648 : lockmode);
5649 75 : break;
5650 0 : case AT_EnableTrigAll: /* ENABLE TRIGGER ALL */
5651 0 : ATExecEnableDisableTrigger(rel, NULL,
5652 : TRIGGER_FIRES_ON_ORIGIN, false,
5653 0 : cmd->recurse,
5654 : lockmode);
5655 0 : break;
5656 8 : case AT_DisableTrigAll: /* DISABLE TRIGGER ALL */
5657 8 : ATExecEnableDisableTrigger(rel, NULL,
5658 : TRIGGER_DISABLED, false,
5659 8 : cmd->recurse,
5660 : lockmode);
5661 8 : break;
5662 0 : case AT_EnableTrigUser: /* ENABLE TRIGGER USER */
5663 0 : ATExecEnableDisableTrigger(rel, NULL,
5664 : TRIGGER_FIRES_ON_ORIGIN, true,
5665 0 : cmd->recurse,
5666 : lockmode);
5667 0 : break;
5668 8 : case AT_DisableTrigUser: /* DISABLE TRIGGER USER */
5669 8 : ATExecEnableDisableTrigger(rel, NULL,
5670 : TRIGGER_DISABLED, true,
5671 8 : cmd->recurse,
5672 : lockmode);
5673 8 : break;
5674 :
5675 5 : case AT_EnableRule: /* ENABLE RULE name */
5676 5 : ATExecEnableDisableRule(rel, cmd->name,
5677 : RULE_FIRES_ON_ORIGIN, lockmode);
5678 5 : break;
5679 0 : case AT_EnableAlwaysRule: /* ENABLE ALWAYS RULE name */
5680 0 : ATExecEnableDisableRule(rel, cmd->name,
5681 : RULE_FIRES_ALWAYS, lockmode);
5682 0 : break;
5683 4 : case AT_EnableReplicaRule: /* ENABLE REPLICA RULE name */
5684 4 : ATExecEnableDisableRule(rel, cmd->name,
5685 : RULE_FIRES_ON_REPLICA, lockmode);
5686 4 : break;
5687 20 : case AT_DisableRule: /* DISABLE RULE name */
5688 20 : ATExecEnableDisableRule(rel, cmd->name,
5689 : RULE_DISABLED, lockmode);
5690 20 : break;
5691 :
5692 289 : case AT_AddInherit:
5693 289 : address = ATExecAddInherit(rel, (RangeVar *) cmd->def, lockmode);
5694 209 : break;
5695 69 : case AT_DropInherit:
5696 69 : address = ATExecDropInherit(rel, (RangeVar *) cmd->def, lockmode);
5697 65 : break;
5698 42 : case AT_AddOf:
5699 42 : address = ATExecAddOf(rel, (TypeName *) cmd->def, lockmode);
5700 18 : break;
5701 4 : case AT_DropOf:
5702 4 : ATExecDropOf(rel, lockmode);
5703 4 : break;
5704 322 : case AT_ReplicaIdentity:
5705 322 : ATExecReplicaIdentity(rel, (ReplicaIdentityStmt *) cmd->def, lockmode);
5706 290 : break;
5707 240 : case AT_EnableRowSecurity:
5708 240 : ATExecSetRowSecurity(rel, true);
5709 240 : break;
5710 6 : case AT_DisableRowSecurity:
5711 6 : ATExecSetRowSecurity(rel, false);
5712 6 : break;
5713 70 : case AT_ForceRowSecurity:
5714 70 : ATExecForceNoForceRowSecurity(rel, true);
5715 70 : break;
5716 20 : case AT_NoForceRowSecurity:
5717 20 : ATExecForceNoForceRowSecurity(rel, false);
5718 20 : break;
5719 33 : case AT_GenericOptions:
5720 33 : ATExecGenericOptions(rel, (List *) cmd->def);
5721 32 : break;
5722 1889 : case AT_AttachPartition:
5723 1889 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5724 : cur_pass, context);
5725 : Assert(cmd != NULL);
5726 1873 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
5727 1604 : address = ATExecAttachPartition(wqueue, rel, (PartitionCmd *) cmd->def,
5728 : context);
5729 : else
5730 269 : address = ATExecAttachPartitionIdx(wqueue, rel,
5731 269 : ((PartitionCmd *) cmd->def)->name);
5732 1609 : break;
5733 373 : case AT_DetachPartition:
5734 373 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5735 : cur_pass, context);
5736 : Assert(cmd != NULL);
5737 : /* ATPrepCmd ensures it must be a table */
5738 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5739 373 : address = ATExecDetachPartition(wqueue, tab, rel,
5740 373 : ((PartitionCmd *) cmd->def)->name,
5741 373 : ((PartitionCmd *) cmd->def)->concurrent);
5742 296 : break;
5743 7 : case AT_DetachPartitionFinalize:
5744 7 : address = ATExecDetachPartitionFinalize(rel, ((PartitionCmd *) cmd->def)->name);
5745 7 : break;
5746 180 : case AT_MergePartitions:
5747 180 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5748 : cur_pass, context);
5749 : Assert(cmd != NULL);
5750 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5751 124 : ATExecMergePartitions(wqueue, tab, rel, (PartitionCmd *) cmd->def,
5752 : context);
5753 90 : break;
5754 249 : case AT_SplitPartition:
5755 249 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5756 : cur_pass, context);
5757 : Assert(cmd != NULL);
5758 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5759 129 : ATExecSplitPartition(wqueue, tab, rel, (PartitionCmd *) cmd->def,
5760 : context);
5761 121 : break;
5762 0 : default: /* oops */
5763 0 : elog(ERROR, "unrecognized alter table type: %d",
5764 : (int) cmd->subtype);
5765 : break;
5766 : }
5767 :
5768 : /*
5769 : * Report the subcommand to interested event triggers.
5770 : */
5771 36780 : if (cmd)
5772 26447 : EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
5773 :
5774 : /*
5775 : * Bump the command counter to ensure the next subcommand in the sequence
5776 : * can see the changes so far
5777 : */
5778 36780 : CommandCounterIncrement();
5779 36780 : }
5780 :
5781 : /*
5782 : * ATParseTransformCmd: perform parse transformation for one subcommand
5783 : *
5784 : * Returns the transformed subcommand tree, if there is one, else NULL.
5785 : *
5786 : * The parser may hand back additional AlterTableCmd(s) and/or other
5787 : * utility statements, either before or after the original subcommand.
5788 : * Other AlterTableCmds are scheduled into the appropriate slot of the
5789 : * AlteredTableInfo (they had better be for later passes than the current one).
5790 : * Utility statements that are supposed to happen before the AlterTableCmd
5791 : * are executed immediately. Those that are supposed to happen afterwards
5792 : * are added to the tab->afterStmts list to be done at the very end.
5793 : */
5794 : static AlterTableCmd *
5795 15676 : ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
5796 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
5797 : AlterTablePass cur_pass, AlterTableUtilityContext *context)
5798 : {
5799 15676 : AlterTableCmd *newcmd = NULL;
5800 15676 : AlterTableStmt *atstmt = makeNode(AlterTableStmt);
5801 : List *beforeStmts;
5802 : List *afterStmts;
5803 : ListCell *lc;
5804 :
5805 : /* Gin up an AlterTableStmt with just this subcommand and this table */
5806 15676 : atstmt->relation =
5807 15676 : makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
5808 15676 : pstrdup(RelationGetRelationName(rel)),
5809 : -1);
5810 15676 : atstmt->relation->inh = recurse;
5811 15676 : atstmt->cmds = list_make1(cmd);
5812 15676 : atstmt->objtype = OBJECT_TABLE; /* needn't be picky here */
5813 15676 : atstmt->missing_ok = false;
5814 :
5815 : /* Transform the AlterTableStmt */
5816 15676 : atstmt = transformAlterTableStmt(RelationGetRelid(rel),
5817 : atstmt,
5818 : context->queryString,
5819 : &beforeStmts,
5820 : &afterStmts);
5821 :
5822 : /* Execute any statements that should happen before these subcommand(s) */
5823 15763 : foreach(lc, beforeStmts)
5824 : {
5825 315 : Node *stmt = (Node *) lfirst(lc);
5826 :
5827 315 : ProcessUtilityForAlterTable(stmt, context);
5828 307 : CommandCounterIncrement();
5829 : }
5830 :
5831 : /* Examine the transformed subcommands and schedule them appropriately */
5832 36041 : foreach(lc, atstmt->cmds)
5833 : {
5834 20593 : AlterTableCmd *cmd2 = lfirst_node(AlterTableCmd, lc);
5835 : AlterTablePass pass;
5836 :
5837 : /*
5838 : * This switch need only cover the subcommand types that can be added
5839 : * by parse_utilcmd.c; otherwise, we'll use the default strategy of
5840 : * executing the subcommand immediately, as a substitute for the
5841 : * original subcommand. (Note, however, that this does cause
5842 : * AT_AddConstraint subcommands to be rescheduled into later passes,
5843 : * which is important for index and foreign key constraints.)
5844 : *
5845 : * We assume we needn't do any phase-1 checks for added subcommands.
5846 : */
5847 20593 : switch (cmd2->subtype)
5848 : {
5849 771 : case AT_AddIndex:
5850 771 : pass = AT_PASS_ADD_INDEX;
5851 771 : break;
5852 6653 : case AT_AddIndexConstraint:
5853 6653 : pass = AT_PASS_ADD_INDEXCONSTR;
5854 6653 : break;
5855 8054 : case AT_AddConstraint:
5856 : /* Recursion occurs during execution phase */
5857 8054 : if (recurse)
5858 8017 : cmd2->recurse = true;
5859 8054 : switch (castNode(Constraint, cmd2->def)->contype)
5860 : {
5861 5568 : case CONSTR_NOTNULL:
5862 5568 : pass = AT_PASS_COL_ATTRS;
5863 5568 : break;
5864 0 : case CONSTR_PRIMARY:
5865 : case CONSTR_UNIQUE:
5866 : case CONSTR_EXCLUSION:
5867 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5868 0 : break;
5869 2486 : default:
5870 2486 : pass = AT_PASS_ADD_OTHERCONSTR;
5871 2486 : break;
5872 : }
5873 8054 : break;
5874 0 : case AT_AlterColumnGenericOptions:
5875 : /* This command never recurses */
5876 : /* No command-specific prep needed */
5877 0 : pass = AT_PASS_MISC;
5878 0 : break;
5879 5115 : default:
5880 5115 : pass = cur_pass;
5881 5115 : break;
5882 : }
5883 :
5884 20593 : if (pass < cur_pass)
5885 : {
5886 : /* Cannot schedule into a pass we already finished */
5887 0 : elog(ERROR, "ALTER TABLE scheduling failure: too late for pass %d",
5888 : pass);
5889 : }
5890 20593 : else if (pass > cur_pass)
5891 : {
5892 : /* OK, queue it up for later */
5893 15478 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd2);
5894 : }
5895 : else
5896 : {
5897 : /*
5898 : * We should see at most one subcommand for the current pass,
5899 : * which is the transformed version of the original subcommand.
5900 : */
5901 5115 : if (newcmd == NULL && cmd->subtype == cmd2->subtype)
5902 : {
5903 : /* Found the transformed version of our subcommand */
5904 5115 : newcmd = cmd2;
5905 : }
5906 : else
5907 0 : elog(ERROR, "ALTER TABLE scheduling failure: bogus item for pass %d",
5908 : pass);
5909 : }
5910 : }
5911 :
5912 : /* Queue up any after-statements to happen at the end */
5913 15448 : tab->afterStmts = list_concat(tab->afterStmts, afterStmts);
5914 :
5915 15448 : return newcmd;
5916 : }
5917 :
5918 : /*
5919 : * ATRewriteTables: ALTER TABLE phase 3
5920 : */
5921 : static void
5922 19224 : ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
5923 : AlterTableUtilityContext *context)
5924 : {
5925 : ListCell *ltab;
5926 :
5927 : /* Go through each table that needs to be checked or rewritten */
5928 41076 : foreach(ltab, *wqueue)
5929 : {
5930 22186 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5931 :
5932 : /* Relations without storage may be ignored here */
5933 22186 : if (!RELKIND_HAS_STORAGE(tab->relkind))
5934 4150 : continue;
5935 :
5936 : /*
5937 : * If we change column data types, the operation has to be propagated
5938 : * to tables that use this table's rowtype as a column type.
5939 : * tab->newvals will also be non-NULL in the case where we're adding a
5940 : * column with a default. We choose to forbid that case as well,
5941 : * since composite types might eventually support defaults.
5942 : *
5943 : * (Eventually we'll probably need to check for composite type
5944 : * dependencies even when we're just scanning the table without a
5945 : * rewrite, but at the moment a composite type does not enforce any
5946 : * constraints, so it's not necessary/appropriate to enforce them just
5947 : * during ALTER.)
5948 : */
5949 18036 : if (tab->newvals != NIL || tab->rewrite > 0)
5950 : {
5951 : Relation rel;
5952 :
5953 1329 : rel = table_open(tab->relid, NoLock);
5954 1329 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
5955 1293 : table_close(rel, NoLock);
5956 : }
5957 :
5958 : /*
5959 : * We only need to rewrite the table if at least one column needs to
5960 : * be recomputed, or we are changing its persistence or access method.
5961 : *
5962 : * There are two reasons for requiring a rewrite when changing
5963 : * persistence: on one hand, we need to ensure that the buffers
5964 : * belonging to each of the two relations are marked with or without
5965 : * BM_PERMANENT properly. On the other hand, since rewriting creates
5966 : * and assigns a new relfilenumber, we automatically create or drop an
5967 : * init fork for the relation as appropriate.
5968 : */
5969 18000 : if (tab->rewrite > 0 && tab->relkind != RELKIND_SEQUENCE)
5970 728 : {
5971 : /* Build a temporary relation and copy data */
5972 : Relation OldHeap;
5973 : Oid OIDNewHeap;
5974 : Oid NewAccessMethod;
5975 : Oid NewTableSpace;
5976 : char persistence;
5977 :
5978 797 : OldHeap = table_open(tab->relid, NoLock);
5979 :
5980 : /*
5981 : * We don't support rewriting of system catalogs; there are too
5982 : * many corner cases and too little benefit. In particular this
5983 : * is certainly not going to work for mapped catalogs.
5984 : */
5985 797 : if (IsSystemRelation(OldHeap))
5986 0 : ereport(ERROR,
5987 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5988 : errmsg("cannot rewrite system relation \"%s\"",
5989 : RelationGetRelationName(OldHeap))));
5990 :
5991 797 : if (RelationIsUsedAsCatalogTable(OldHeap))
5992 1 : ereport(ERROR,
5993 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5994 : errmsg("cannot rewrite table \"%s\" used as a catalog table",
5995 : RelationGetRelationName(OldHeap))));
5996 :
5997 : /*
5998 : * Don't allow rewrite on temp tables of other backends ... their
5999 : * local buffer manager is not going to cope. (This is redundant
6000 : * with the check in CheckAlterTableIsSafe, but for safety we'll
6001 : * check here too.)
6002 : */
6003 796 : if (RELATION_IS_OTHER_TEMP(OldHeap))
6004 0 : ereport(ERROR,
6005 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
6006 : errmsg("cannot rewrite temporary tables of other sessions")));
6007 :
6008 : /*
6009 : * Select destination tablespace (same as original unless user
6010 : * requested a change)
6011 : */
6012 796 : if (tab->newTableSpace)
6013 0 : NewTableSpace = tab->newTableSpace;
6014 : else
6015 796 : NewTableSpace = OldHeap->rd_rel->reltablespace;
6016 :
6017 : /*
6018 : * Select destination access method (same as original unless user
6019 : * requested a change)
6020 : */
6021 796 : if (tab->chgAccessMethod)
6022 24 : NewAccessMethod = tab->newAccessMethod;
6023 : else
6024 772 : NewAccessMethod = OldHeap->rd_rel->relam;
6025 :
6026 : /*
6027 : * Select persistence of transient table (same as original unless
6028 : * user requested a change)
6029 : */
6030 796 : persistence = tab->chgPersistence ?
6031 761 : tab->newrelpersistence : OldHeap->rd_rel->relpersistence;
6032 :
6033 796 : table_close(OldHeap, NoLock);
6034 :
6035 : /*
6036 : * Fire off an Event Trigger now, before actually rewriting the
6037 : * table.
6038 : *
6039 : * We don't support Event Trigger for nested commands anywhere,
6040 : * here included, and parsetree is given NULL when coming from
6041 : * AlterTableInternal.
6042 : *
6043 : * And fire it only once.
6044 : */
6045 796 : if (parsetree)
6046 796 : EventTriggerTableRewrite((Node *) parsetree,
6047 : tab->relid,
6048 : tab->rewrite);
6049 :
6050 : /*
6051 : * Create transient table that will receive the modified data.
6052 : *
6053 : * Ensure it is marked correctly as logged or unlogged. We have
6054 : * to do this here so that buffers for the new relfilenumber will
6055 : * have the right persistence set, and at the same time ensure
6056 : * that the original filenumbers's buffers will get read in with
6057 : * the correct setting (i.e. the original one). Otherwise a
6058 : * rollback after the rewrite would possibly result with buffers
6059 : * for the original filenumbers having the wrong persistence
6060 : * setting.
6061 : *
6062 : * NB: This relies on swap_relation_files() also swapping the
6063 : * persistence. That wouldn't work for pg_class, but that can't be
6064 : * unlogged anyway.
6065 : */
6066 792 : OIDNewHeap = make_new_heap(tab->relid, NewTableSpace, NewAccessMethod,
6067 : persistence, lockmode);
6068 :
6069 : /*
6070 : * Copy the heap data into the new table with the desired
6071 : * modifications, and test the current data within the table
6072 : * against new constraints generated by ALTER TABLE commands.
6073 : */
6074 792 : ATRewriteTable(tab, OIDNewHeap);
6075 :
6076 : /*
6077 : * Swap the physical files of the old and new heaps, then rebuild
6078 : * indexes and discard the old heap. We can use RecentXmin for
6079 : * the table's new relfrozenxid because we rewrote all the tuples
6080 : * in ATRewriteTable, so no older Xid remains in the table. Also,
6081 : * we never try to swap toast tables by content, since we have no
6082 : * interest in letting this code work on system catalogs.
6083 : */
6084 732 : finish_heap_swap(tab->relid, OIDNewHeap,
6085 : false, false, true,
6086 732 : !OidIsValid(tab->newTableSpace),
6087 : true, /* reindex */
6088 : RecentXmin,
6089 : ReadNextMultiXactId(),
6090 : persistence);
6091 :
6092 728 : InvokeObjectPostAlterHook(RelationRelationId, tab->relid, 0);
6093 : }
6094 17203 : else if (tab->rewrite > 0 && tab->relkind == RELKIND_SEQUENCE)
6095 : {
6096 16 : if (tab->chgPersistence)
6097 16 : SequenceChangePersistence(tab->relid, tab->newrelpersistence);
6098 : }
6099 : else
6100 : {
6101 : /*
6102 : * If required, test the current data within the table against new
6103 : * constraints generated by ALTER TABLE commands, but don't
6104 : * rebuild data.
6105 : */
6106 17187 : if (tab->constraints != NIL || tab->verify_new_notnull ||
6107 15001 : tab->partition_constraint != NULL)
6108 3491 : ATRewriteTable(tab, InvalidOid);
6109 :
6110 : /*
6111 : * If we had SET TABLESPACE but no reason to reconstruct tuples,
6112 : * just do a block-by-block copy.
6113 : */
6114 16958 : if (tab->newTableSpace)
6115 74 : ATExecSetTableSpace(tab->relid, tab->newTableSpace, lockmode);
6116 : }
6117 :
6118 : /*
6119 : * Also change persistence of owned sequences, so that it matches the
6120 : * table persistence.
6121 : */
6122 17702 : if (tab->chgPersistence)
6123 : {
6124 51 : List *seqlist = getOwnedSequences(tab->relid);
6125 : ListCell *lc;
6126 :
6127 83 : foreach(lc, seqlist)
6128 : {
6129 32 : Oid seq_relid = lfirst_oid(lc);
6130 :
6131 32 : SequenceChangePersistence(seq_relid, tab->newrelpersistence);
6132 : }
6133 : }
6134 : }
6135 :
6136 : /*
6137 : * Foreign key constraints are checked in a final pass, since (a) it's
6138 : * generally best to examine each one separately, and (b) it's at least
6139 : * theoretically possible that we have changed both relations of the
6140 : * foreign key, and we'd better have finished both rewrites before we try
6141 : * to read the tables.
6142 : */
6143 40493 : foreach(ltab, *wqueue)
6144 : {
6145 21674 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6146 21674 : Relation rel = NULL;
6147 : ListCell *lcon;
6148 :
6149 : /* Relations without storage may be ignored here too */
6150 21674 : if (!RELKIND_HAS_STORAGE(tab->relkind))
6151 4045 : continue;
6152 :
6153 19008 : foreach(lcon, tab->constraints)
6154 : {
6155 1450 : NewConstraint *con = lfirst(lcon);
6156 :
6157 1450 : if (con->contype == CONSTR_FOREIGN)
6158 : {
6159 828 : Constraint *fkconstraint = (Constraint *) con->qual;
6160 : Relation refrel;
6161 :
6162 828 : if (rel == NULL)
6163 : {
6164 : /* Long since locked, no need for another */
6165 820 : rel = table_open(tab->relid, NoLock);
6166 : }
6167 :
6168 828 : refrel = table_open(con->refrelid, RowShareLock);
6169 :
6170 828 : validateForeignKeyConstraint(fkconstraint->conname, rel, refrel,
6171 : con->refindid,
6172 : con->conid,
6173 828 : con->conwithperiod);
6174 :
6175 : /*
6176 : * No need to mark the constraint row as validated, we did
6177 : * that when we inserted the row earlier.
6178 : */
6179 :
6180 757 : table_close(refrel, NoLock);
6181 : }
6182 : }
6183 :
6184 17558 : if (rel)
6185 749 : table_close(rel, NoLock);
6186 : }
6187 :
6188 : /* Finally, run any afterStmts that were queued up */
6189 40395 : foreach(ltab, *wqueue)
6190 : {
6191 21576 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6192 : ListCell *lc;
6193 :
6194 21632 : foreach(lc, tab->afterStmts)
6195 : {
6196 56 : Node *stmt = (Node *) lfirst(lc);
6197 :
6198 56 : ProcessUtilityForAlterTable(stmt, context);
6199 56 : CommandCounterIncrement();
6200 : }
6201 : }
6202 18819 : }
6203 :
6204 : /*
6205 : * ATRewriteTable: scan or rewrite one table
6206 : *
6207 : * A rewrite is requested by passing a valid OIDNewHeap; in that case, caller
6208 : * must already hold AccessExclusiveLock on it.
6209 : */
6210 : static void
6211 4283 : ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
6212 : {
6213 : Relation oldrel;
6214 : Relation newrel;
6215 : TupleDesc oldTupDesc;
6216 : TupleDesc newTupDesc;
6217 4283 : bool needscan = false;
6218 : List *notnull_attrs;
6219 : List *notnull_virtual_attrs;
6220 : int i;
6221 : ListCell *l;
6222 : EState *estate;
6223 : CommandId mycid;
6224 : BulkInsertState bistate;
6225 : uint32 ti_options;
6226 4283 : ExprState *partqualstate = NULL;
6227 :
6228 : /*
6229 : * Open the relation(s). We have surely already locked the existing
6230 : * table.
6231 : */
6232 4283 : oldrel = table_open(tab->relid, NoLock);
6233 4283 : oldTupDesc = tab->oldDesc;
6234 4283 : newTupDesc = RelationGetDescr(oldrel); /* includes all mods */
6235 :
6236 4283 : if (OidIsValid(OIDNewHeap))
6237 : {
6238 : Assert(CheckRelationOidLockedByMe(OIDNewHeap, AccessExclusiveLock,
6239 : false));
6240 792 : newrel = table_open(OIDNewHeap, NoLock);
6241 : }
6242 : else
6243 3491 : newrel = NULL;
6244 :
6245 : /*
6246 : * Prepare a BulkInsertState and options for table_tuple_insert. The FSM
6247 : * is empty, so don't bother using it.
6248 : */
6249 4283 : if (newrel)
6250 : {
6251 792 : mycid = GetCurrentCommandId(true);
6252 792 : bistate = GetBulkInsertState();
6253 792 : ti_options = TABLE_INSERT_SKIP_FSM;
6254 : }
6255 : else
6256 : {
6257 : /* keep compiler quiet about using these uninitialized */
6258 3491 : mycid = 0;
6259 3491 : bistate = NULL;
6260 3491 : ti_options = 0;
6261 : }
6262 :
6263 : /*
6264 : * Generate the constraint and default execution states
6265 : */
6266 :
6267 4283 : estate = CreateExecutorState();
6268 :
6269 : /* Build the needed expression execution states */
6270 5889 : foreach(l, tab->constraints)
6271 : {
6272 1606 : NewConstraint *con = lfirst(l);
6273 :
6274 1606 : switch (con->contype)
6275 : {
6276 774 : case CONSTR_CHECK:
6277 774 : needscan = true;
6278 774 : con->qualstate = ExecPrepareExpr((Expr *) expand_generated_columns_in_expr(con->qual, oldrel, 1), estate);
6279 774 : break;
6280 832 : case CONSTR_FOREIGN:
6281 : /* Nothing to do here */
6282 832 : break;
6283 0 : default:
6284 0 : elog(ERROR, "unrecognized constraint type: %d",
6285 : (int) con->contype);
6286 : }
6287 : }
6288 :
6289 : /* Build expression execution states for partition check quals */
6290 4283 : if (tab->partition_constraint)
6291 : {
6292 1399 : needscan = true;
6293 1399 : partqualstate = ExecPrepareExpr(tab->partition_constraint, estate);
6294 : }
6295 :
6296 5132 : foreach(l, tab->newvals)
6297 : {
6298 849 : NewColumnValue *ex = lfirst(l);
6299 :
6300 : /* expr already planned */
6301 849 : ex->exprstate = ExecInitExpr(ex->expr, NULL);
6302 : }
6303 :
6304 4283 : notnull_attrs = notnull_virtual_attrs = NIL;
6305 4283 : if (newrel || tab->verify_new_notnull)
6306 : {
6307 : /*
6308 : * If we are rebuilding the tuples OR if we added any new but not
6309 : * verified not-null constraints, check all *valid* not-null
6310 : * constraints. This is a bit of overkill but it minimizes risk of
6311 : * bugs.
6312 : *
6313 : * notnull_attrs does *not* collect attribute numbers for valid
6314 : * not-null constraints over virtual generated columns; instead, they
6315 : * are collected in notnull_virtual_attrs for verification elsewhere.
6316 : */
6317 5550 : for (i = 0; i < newTupDesc->natts; i++)
6318 : {
6319 4065 : CompactAttribute *attr = TupleDescCompactAttr(newTupDesc, i);
6320 :
6321 4065 : if (attr->attnullability == ATTNULLABLE_VALID &&
6322 1476 : !attr->attisdropped)
6323 : {
6324 1476 : Form_pg_attribute wholeatt = TupleDescAttr(newTupDesc, i);
6325 :
6326 1476 : if (wholeatt->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
6327 1416 : notnull_attrs = lappend_int(notnull_attrs, wholeatt->attnum);
6328 : else
6329 60 : notnull_virtual_attrs = lappend_int(notnull_virtual_attrs,
6330 60 : wholeatt->attnum);
6331 : }
6332 : }
6333 1485 : if (notnull_attrs || notnull_virtual_attrs)
6334 1075 : needscan = true;
6335 : }
6336 :
6337 4283 : if (newrel || needscan)
6338 : {
6339 : ExprContext *econtext;
6340 : TupleTableSlot *oldslot;
6341 : TupleTableSlot *newslot;
6342 : TableScanDesc scan;
6343 : MemoryContext oldCxt;
6344 3581 : List *dropped_attrs = NIL;
6345 : ListCell *lc;
6346 : Snapshot snapshot;
6347 3581 : ResultRelInfo *rInfo = NULL;
6348 :
6349 : /*
6350 : * When adding or changing a virtual generated column with a not-null
6351 : * constraint, we need to evaluate whether the generation expression
6352 : * is null. For that, we borrow ExecRelGenVirtualNotNull(). Here, we
6353 : * prepare a dummy ResultRelInfo.
6354 : */
6355 3581 : if (notnull_virtual_attrs != NIL)
6356 : {
6357 : MemoryContext oldcontext;
6358 :
6359 : Assert(newTupDesc->constr->has_generated_virtual);
6360 : Assert(newTupDesc->constr->has_not_null);
6361 40 : oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
6362 40 : rInfo = makeNode(ResultRelInfo);
6363 40 : InitResultRelInfo(rInfo,
6364 : oldrel,
6365 : 0, /* dummy rangetable index */
6366 : NULL,
6367 : estate->es_instrument);
6368 40 : MemoryContextSwitchTo(oldcontext);
6369 : }
6370 :
6371 3581 : if (newrel)
6372 792 : ereport(DEBUG1,
6373 : (errmsg_internal("rewriting table \"%s\"",
6374 : RelationGetRelationName(oldrel))));
6375 : else
6376 2789 : ereport(DEBUG1,
6377 : (errmsg_internal("verifying table \"%s\"",
6378 : RelationGetRelationName(oldrel))));
6379 :
6380 3581 : if (newrel)
6381 : {
6382 : /*
6383 : * All predicate locks on the tuples or pages are about to be made
6384 : * invalid, because we move tuples around. Promote them to
6385 : * relation locks.
6386 : */
6387 792 : TransferPredicateLocksToHeapRelation(oldrel);
6388 : }
6389 :
6390 3581 : econtext = GetPerTupleExprContext(estate);
6391 :
6392 : /*
6393 : * Create necessary tuple slots. When rewriting, two slots are needed,
6394 : * otherwise one suffices. In the case where one slot suffices, we
6395 : * need to use the new tuple descriptor, otherwise some constraints
6396 : * can't be evaluated. Note that even when the tuple layout is the
6397 : * same and no rewrite is required, the tupDescs might not be
6398 : * (consider ADD COLUMN without a default).
6399 : */
6400 3581 : if (tab->rewrite)
6401 : {
6402 : Assert(newrel != NULL);
6403 792 : oldslot = MakeSingleTupleTableSlot(oldTupDesc,
6404 : table_slot_callbacks(oldrel));
6405 792 : newslot = MakeSingleTupleTableSlot(newTupDesc,
6406 : table_slot_callbacks(newrel));
6407 :
6408 : /*
6409 : * Set all columns in the new slot to NULL initially, to ensure
6410 : * columns added as part of the rewrite are initialized to NULL.
6411 : * That is necessary as tab->newvals will not contain an
6412 : * expression for columns with a NULL default, e.g. when adding a
6413 : * column without a default together with a column with a default
6414 : * requiring an actual rewrite.
6415 : */
6416 792 : ExecStoreAllNullTuple(newslot);
6417 : }
6418 : else
6419 : {
6420 2789 : oldslot = MakeSingleTupleTableSlot(newTupDesc,
6421 : table_slot_callbacks(oldrel));
6422 2789 : newslot = NULL;
6423 : }
6424 :
6425 : /*
6426 : * Any attributes that are dropped according to the new tuple
6427 : * descriptor can be set to NULL. We precompute the list of dropped
6428 : * attributes to avoid needing to do so in the per-tuple loop.
6429 : */
6430 12718 : for (i = 0; i < newTupDesc->natts; i++)
6431 : {
6432 9137 : if (TupleDescAttr(newTupDesc, i)->attisdropped)
6433 600 : dropped_attrs = lappend_int(dropped_attrs, i);
6434 : }
6435 :
6436 : /*
6437 : * Scan through the rows, generating a new row if needed and then
6438 : * checking all the constraints.
6439 : */
6440 3581 : snapshot = RegisterSnapshot(GetLatestSnapshot());
6441 3581 : scan = table_beginscan(oldrel, snapshot, 0, NULL,
6442 : SO_NONE);
6443 :
6444 : /*
6445 : * Switch to per-tuple memory context and reset it for each tuple
6446 : * produced, so we don't leak memory.
6447 : */
6448 3581 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
6449 :
6450 491261 : while (table_scan_getnextslot(scan, ForwardScanDirection, oldslot))
6451 : {
6452 : TupleTableSlot *insertslot;
6453 :
6454 484388 : if (tab->rewrite > 0)
6455 : {
6456 : /* Extract data from old tuple */
6457 67503 : slot_getallattrs(oldslot);
6458 67503 : ExecClearTuple(newslot);
6459 :
6460 : /* copy attributes */
6461 67503 : memcpy(newslot->tts_values, oldslot->tts_values,
6462 67503 : sizeof(Datum) * oldslot->tts_nvalid);
6463 67503 : memcpy(newslot->tts_isnull, oldslot->tts_isnull,
6464 67503 : sizeof(bool) * oldslot->tts_nvalid);
6465 :
6466 : /* Set dropped attributes to null in new tuple */
6467 67632 : foreach(lc, dropped_attrs)
6468 129 : newslot->tts_isnull[lfirst_int(lc)] = true;
6469 :
6470 : /*
6471 : * Constraints and GENERATED expressions might reference the
6472 : * tableoid column, so fill tts_tableOid with the desired
6473 : * value. (We must do this each time, because it gets
6474 : * overwritten with newrel's OID during storing.)
6475 : */
6476 67503 : newslot->tts_tableOid = RelationGetRelid(oldrel);
6477 :
6478 : /*
6479 : * Process supplied expressions to replace selected columns.
6480 : *
6481 : * First, evaluate expressions whose inputs come from the old
6482 : * tuple.
6483 : */
6484 67503 : econtext->ecxt_scantuple = oldslot;
6485 :
6486 137986 : foreach(l, tab->newvals)
6487 : {
6488 70503 : NewColumnValue *ex = lfirst(l);
6489 :
6490 70503 : if (ex->is_generated)
6491 264 : continue;
6492 :
6493 70239 : newslot->tts_values[ex->attnum - 1]
6494 70219 : = ExecEvalExpr(ex->exprstate,
6495 : econtext,
6496 70239 : &newslot->tts_isnull[ex->attnum - 1]);
6497 : }
6498 :
6499 67483 : ExecStoreVirtualTuple(newslot);
6500 :
6501 : /*
6502 : * Now, evaluate any expressions whose inputs come from the
6503 : * new tuple. We assume these columns won't reference each
6504 : * other, so that there's no ordering dependency.
6505 : */
6506 67483 : econtext->ecxt_scantuple = newslot;
6507 :
6508 137966 : foreach(l, tab->newvals)
6509 : {
6510 70483 : NewColumnValue *ex = lfirst(l);
6511 :
6512 70483 : if (!ex->is_generated)
6513 70219 : continue;
6514 :
6515 264 : newslot->tts_values[ex->attnum - 1]
6516 264 : = ExecEvalExpr(ex->exprstate,
6517 : econtext,
6518 264 : &newslot->tts_isnull[ex->attnum - 1]);
6519 : }
6520 :
6521 67483 : insertslot = newslot;
6522 : }
6523 : else
6524 : {
6525 : /*
6526 : * If there's no rewrite, old and new table are guaranteed to
6527 : * have the same AM, so we can just use the old slot to verify
6528 : * new constraints etc.
6529 : */
6530 416885 : insertslot = oldslot;
6531 : }
6532 :
6533 : /* Now check any constraints on the possibly-changed tuple */
6534 484368 : econtext->ecxt_scantuple = insertslot;
6535 :
6536 2579594 : foreach_int(attn, notnull_attrs)
6537 : {
6538 1611034 : if (slot_attisnull(insertslot, attn))
6539 : {
6540 88 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attn - 1);
6541 :
6542 88 : ereport(ERROR,
6543 : (errcode(ERRCODE_NOT_NULL_VIOLATION),
6544 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6545 : NameStr(attr->attname),
6546 : RelationGetRelationName(oldrel)),
6547 : errtablecol(oldrel, attn)));
6548 : }
6549 : }
6550 :
6551 484280 : if (notnull_virtual_attrs != NIL)
6552 : {
6553 : AttrNumber attnum;
6554 :
6555 56 : attnum = ExecRelGenVirtualNotNull(rInfo, insertslot,
6556 : estate,
6557 : notnull_virtual_attrs);
6558 56 : if (attnum != InvalidAttrNumber)
6559 : {
6560 20 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attnum - 1);
6561 :
6562 20 : ereport(ERROR,
6563 : errcode(ERRCODE_NOT_NULL_VIOLATION),
6564 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6565 : NameStr(attr->attname),
6566 : RelationGetRelationName(oldrel)),
6567 : errtablecol(oldrel, attnum));
6568 : }
6569 : }
6570 :
6571 489601 : foreach(l, tab->constraints)
6572 : {
6573 5453 : NewConstraint *con = lfirst(l);
6574 :
6575 5453 : switch (con->contype)
6576 : {
6577 5387 : case CONSTR_CHECK:
6578 5387 : if (!ExecCheck(con->qualstate, econtext))
6579 112 : ereport(ERROR,
6580 : (errcode(ERRCODE_CHECK_VIOLATION),
6581 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
6582 : con->name,
6583 : RelationGetRelationName(oldrel)),
6584 : errtableconstraint(oldrel, con->name)));
6585 5275 : break;
6586 66 : case CONSTR_NOTNULL:
6587 : case CONSTR_FOREIGN:
6588 : /* Nothing to do here */
6589 66 : break;
6590 0 : default:
6591 0 : elog(ERROR, "unrecognized constraint type: %d",
6592 : (int) con->contype);
6593 : }
6594 : }
6595 :
6596 484148 : if (partqualstate && !ExecCheck(partqualstate, econtext))
6597 : {
6598 49 : if (tab->validate_default)
6599 17 : ereport(ERROR,
6600 : (errcode(ERRCODE_CHECK_VIOLATION),
6601 : errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
6602 : RelationGetRelationName(oldrel)),
6603 : errtable(oldrel)));
6604 : else
6605 32 : ereport(ERROR,
6606 : (errcode(ERRCODE_CHECK_VIOLATION),
6607 : errmsg("partition constraint of relation \"%s\" is violated by some row",
6608 : RelationGetRelationName(oldrel)),
6609 : errtable(oldrel)));
6610 : }
6611 :
6612 : /* Write the tuple out to the new relation */
6613 484099 : if (newrel)
6614 67443 : table_tuple_insert(newrel, insertslot, mycid,
6615 : ti_options, bistate);
6616 :
6617 484099 : ResetExprContext(econtext);
6618 :
6619 484099 : CHECK_FOR_INTERRUPTS();
6620 : }
6621 :
6622 3292 : MemoryContextSwitchTo(oldCxt);
6623 3292 : table_endscan(scan);
6624 3292 : UnregisterSnapshot(snapshot);
6625 :
6626 3292 : ExecDropSingleTupleTableSlot(oldslot);
6627 3292 : if (newslot)
6628 732 : ExecDropSingleTupleTableSlot(newslot);
6629 : }
6630 :
6631 3994 : FreeExecutorState(estate);
6632 :
6633 3994 : table_close(oldrel, NoLock);
6634 3994 : if (newrel)
6635 : {
6636 732 : FreeBulkInsertState(bistate);
6637 :
6638 732 : table_finish_bulk_insert(newrel, ti_options);
6639 :
6640 732 : table_close(newrel, NoLock);
6641 : }
6642 3994 : }
6643 :
6644 : /*
6645 : * ATGetQueueEntry: find or create an entry in the ALTER TABLE work queue
6646 : */
6647 : static AlteredTableInfo *
6648 29140 : ATGetQueueEntry(List **wqueue, Relation rel)
6649 : {
6650 29140 : Oid relid = RelationGetRelid(rel);
6651 : AlteredTableInfo *tab;
6652 : ListCell *ltab;
6653 :
6654 37576 : foreach(ltab, *wqueue)
6655 : {
6656 12310 : tab = (AlteredTableInfo *) lfirst(ltab);
6657 12310 : if (tab->relid == relid)
6658 3874 : return tab;
6659 : }
6660 :
6661 : /*
6662 : * Not there, so add it. Note that we make a copy of the relation's
6663 : * existing descriptor before anything interesting can happen to it.
6664 : */
6665 25266 : tab = palloc0_object(AlteredTableInfo);
6666 25266 : tab->relid = relid;
6667 25266 : tab->rel = NULL; /* set later */
6668 25266 : tab->relkind = rel->rd_rel->relkind;
6669 25266 : tab->oldDesc = CreateTupleDescCopyConstr(RelationGetDescr(rel));
6670 25266 : tab->newAccessMethod = InvalidOid;
6671 25266 : tab->chgAccessMethod = false;
6672 25266 : tab->newTableSpace = InvalidOid;
6673 25266 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
6674 25266 : tab->chgPersistence = false;
6675 :
6676 25266 : *wqueue = lappend(*wqueue, tab);
6677 :
6678 25266 : return tab;
6679 : }
6680 :
6681 : static const char *
6682 73 : alter_table_type_to_string(AlterTableType cmdtype)
6683 : {
6684 73 : switch (cmdtype)
6685 : {
6686 0 : case AT_AddColumn:
6687 : case AT_AddColumnToView:
6688 0 : return "ADD COLUMN";
6689 0 : case AT_ColumnDefault:
6690 : case AT_CookedColumnDefault:
6691 0 : return "ALTER COLUMN ... SET DEFAULT";
6692 4 : case AT_DropNotNull:
6693 4 : return "ALTER COLUMN ... DROP NOT NULL";
6694 4 : case AT_SetNotNull:
6695 4 : return "ALTER COLUMN ... SET NOT NULL";
6696 0 : case AT_SetExpression:
6697 0 : return "ALTER COLUMN ... SET EXPRESSION";
6698 0 : case AT_DropExpression:
6699 0 : return "ALTER COLUMN ... DROP EXPRESSION";
6700 0 : case AT_SetStatistics:
6701 0 : return "ALTER COLUMN ... SET STATISTICS";
6702 8 : case AT_SetOptions:
6703 8 : return "ALTER COLUMN ... SET";
6704 0 : case AT_ResetOptions:
6705 0 : return "ALTER COLUMN ... RESET";
6706 0 : case AT_SetStorage:
6707 0 : return "ALTER COLUMN ... SET STORAGE";
6708 0 : case AT_SetCompression:
6709 0 : return "ALTER COLUMN ... SET COMPRESSION";
6710 4 : case AT_DropColumn:
6711 4 : return "DROP COLUMN";
6712 0 : case AT_AddIndex:
6713 : case AT_ReAddIndex:
6714 0 : return NULL; /* not real grammar */
6715 0 : case AT_AddConstraint:
6716 : case AT_ReAddConstraint:
6717 : case AT_ReAddDomainConstraint:
6718 : case AT_AddIndexConstraint:
6719 0 : return "ADD CONSTRAINT";
6720 4 : case AT_AlterConstraint:
6721 4 : return "ALTER CONSTRAINT";
6722 0 : case AT_ValidateConstraint:
6723 0 : return "VALIDATE CONSTRAINT";
6724 0 : case AT_DropConstraint:
6725 0 : return "DROP CONSTRAINT";
6726 0 : case AT_ReAddComment:
6727 0 : return NULL; /* not real grammar */
6728 0 : case AT_AlterColumnType:
6729 0 : return "ALTER COLUMN ... SET DATA TYPE";
6730 0 : case AT_AlterColumnGenericOptions:
6731 0 : return "ALTER COLUMN ... OPTIONS";
6732 0 : case AT_ChangeOwner:
6733 0 : return "OWNER TO";
6734 4 : case AT_ClusterOn:
6735 4 : return "CLUSTER ON";
6736 4 : case AT_DropCluster:
6737 4 : return "SET WITHOUT CLUSTER";
6738 0 : case AT_SetAccessMethod:
6739 0 : return "SET ACCESS METHOD";
6740 4 : case AT_SetLogged:
6741 4 : return "SET LOGGED";
6742 4 : case AT_SetUnLogged:
6743 4 : return "SET UNLOGGED";
6744 0 : case AT_DropOids:
6745 0 : return "SET WITHOUT OIDS";
6746 0 : case AT_SetTableSpace:
6747 0 : return "SET TABLESPACE";
6748 1 : case AT_SetRelOptions:
6749 1 : return "SET";
6750 0 : case AT_ResetRelOptions:
6751 0 : return "RESET";
6752 0 : case AT_ReplaceRelOptions:
6753 0 : return NULL; /* not real grammar */
6754 0 : case AT_EnableTrig:
6755 0 : return "ENABLE TRIGGER";
6756 0 : case AT_EnableAlwaysTrig:
6757 0 : return "ENABLE ALWAYS TRIGGER";
6758 0 : case AT_EnableReplicaTrig:
6759 0 : return "ENABLE REPLICA TRIGGER";
6760 0 : case AT_DisableTrig:
6761 0 : return "DISABLE TRIGGER";
6762 0 : case AT_EnableTrigAll:
6763 0 : return "ENABLE TRIGGER ALL";
6764 0 : case AT_DisableTrigAll:
6765 0 : return "DISABLE TRIGGER ALL";
6766 0 : case AT_EnableTrigUser:
6767 0 : return "ENABLE TRIGGER USER";
6768 0 : case AT_DisableTrigUser:
6769 0 : return "DISABLE TRIGGER USER";
6770 0 : case AT_EnableRule:
6771 0 : return "ENABLE RULE";
6772 0 : case AT_EnableAlwaysRule:
6773 0 : return "ENABLE ALWAYS RULE";
6774 0 : case AT_EnableReplicaRule:
6775 0 : return "ENABLE REPLICA RULE";
6776 0 : case AT_DisableRule:
6777 0 : return "DISABLE RULE";
6778 4 : case AT_AddInherit:
6779 4 : return "INHERIT";
6780 4 : case AT_DropInherit:
6781 4 : return "NO INHERIT";
6782 0 : case AT_AddOf:
6783 0 : return "OF";
6784 0 : case AT_DropOf:
6785 0 : return "NOT OF";
6786 0 : case AT_ReplicaIdentity:
6787 0 : return "REPLICA IDENTITY";
6788 0 : case AT_EnableRowSecurity:
6789 0 : return "ENABLE ROW SECURITY";
6790 0 : case AT_DisableRowSecurity:
6791 0 : return "DISABLE ROW SECURITY";
6792 0 : case AT_ForceRowSecurity:
6793 0 : return "FORCE ROW SECURITY";
6794 0 : case AT_NoForceRowSecurity:
6795 0 : return "NO FORCE ROW SECURITY";
6796 0 : case AT_GenericOptions:
6797 0 : return "OPTIONS";
6798 4 : case AT_AttachPartition:
6799 4 : return "ATTACH PARTITION";
6800 12 : case AT_DetachPartition:
6801 12 : return "DETACH PARTITION";
6802 4 : case AT_DetachPartitionFinalize:
6803 4 : return "DETACH PARTITION ... FINALIZE";
6804 0 : case AT_MergePartitions:
6805 0 : return "MERGE PARTITIONS";
6806 4 : case AT_SplitPartition:
6807 4 : return "SPLIT PARTITION";
6808 0 : case AT_AddIdentity:
6809 0 : return "ALTER COLUMN ... ADD IDENTITY";
6810 0 : case AT_SetIdentity:
6811 0 : return "ALTER COLUMN ... SET";
6812 0 : case AT_DropIdentity:
6813 0 : return "ALTER COLUMN ... DROP IDENTITY";
6814 0 : case AT_ReAddStatistics:
6815 0 : return NULL; /* not real grammar */
6816 : }
6817 :
6818 0 : return NULL;
6819 : }
6820 :
6821 : /*
6822 : * ATSimplePermissions
6823 : *
6824 : * - Ensure that it is a relation (or possibly a view)
6825 : * - Ensure this user is the owner
6826 : * - Ensure that it is not a system table
6827 : */
6828 : static void
6829 25850 : ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets)
6830 : {
6831 : int actual_target;
6832 :
6833 25850 : switch (rel->rd_rel->relkind)
6834 : {
6835 20053 : case RELKIND_RELATION:
6836 20053 : actual_target = ATT_TABLE;
6837 20053 : break;
6838 4294 : case RELKIND_PARTITIONED_TABLE:
6839 4294 : actual_target = ATT_PARTITIONED_TABLE;
6840 4294 : break;
6841 280 : case RELKIND_VIEW:
6842 280 : actual_target = ATT_VIEW;
6843 280 : break;
6844 29 : case RELKIND_MATVIEW:
6845 29 : actual_target = ATT_MATVIEW;
6846 29 : break;
6847 140 : case RELKIND_INDEX:
6848 140 : actual_target = ATT_INDEX;
6849 140 : break;
6850 297 : case RELKIND_PARTITIONED_INDEX:
6851 297 : actual_target = ATT_PARTITIONED_INDEX;
6852 297 : break;
6853 145 : case RELKIND_COMPOSITE_TYPE:
6854 145 : actual_target = ATT_COMPOSITE_TYPE;
6855 145 : break;
6856 595 : case RELKIND_FOREIGN_TABLE:
6857 595 : actual_target = ATT_FOREIGN_TABLE;
6858 595 : break;
6859 16 : case RELKIND_SEQUENCE:
6860 16 : actual_target = ATT_SEQUENCE;
6861 16 : break;
6862 1 : default:
6863 1 : actual_target = 0;
6864 1 : break;
6865 : }
6866 :
6867 : /* Wrong target type? */
6868 25850 : if ((actual_target & allowed_targets) == 0)
6869 : {
6870 73 : const char *action_str = alter_table_type_to_string(cmdtype);
6871 :
6872 73 : if (action_str)
6873 73 : ereport(ERROR,
6874 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
6875 : /* translator: %s is a group of some SQL keywords */
6876 : errmsg("ALTER action %s cannot be performed on relation \"%s\"",
6877 : action_str, RelationGetRelationName(rel)),
6878 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
6879 : else
6880 : /* internal error? */
6881 0 : elog(ERROR, "invalid ALTER action attempted on relation \"%s\"",
6882 : RelationGetRelationName(rel));
6883 : }
6884 :
6885 : /* Permissions checks */
6886 25777 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(rel), GetUserId()))
6887 8 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
6888 8 : RelationGetRelationName(rel));
6889 :
6890 25769 : if (!allowSystemTableMods && IsSystemRelation(rel))
6891 0 : ereport(ERROR,
6892 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6893 : errmsg("permission denied: \"%s\" is a system catalog",
6894 : RelationGetRelationName(rel))));
6895 25769 : }
6896 :
6897 : /*
6898 : * ATSimpleRecursion
6899 : *
6900 : * Simple table recursion sufficient for most ALTER TABLE operations.
6901 : * All direct and indirect children are processed in an unspecified order.
6902 : * Note that if a child inherits from the original table via multiple
6903 : * inheritance paths, it will be visited just once.
6904 : */
6905 : static void
6906 917 : ATSimpleRecursion(List **wqueue, Relation rel,
6907 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
6908 : AlterTableUtilityContext *context)
6909 : {
6910 : /*
6911 : * Propagate to children, if desired and if there are (or might be) any
6912 : * children.
6913 : */
6914 917 : if (recurse && rel->rd_rel->relhassubclass)
6915 : {
6916 59 : Oid relid = RelationGetRelid(rel);
6917 : ListCell *child;
6918 : List *children;
6919 :
6920 59 : children = find_all_inheritors(relid, lockmode, NULL);
6921 :
6922 : /*
6923 : * find_all_inheritors does the recursive search of the inheritance
6924 : * hierarchy, so all we have to do is process all of the relids in the
6925 : * list that it returns.
6926 : */
6927 256 : foreach(child, children)
6928 : {
6929 197 : Oid childrelid = lfirst_oid(child);
6930 : Relation childrel;
6931 :
6932 197 : if (childrelid == relid)
6933 59 : continue;
6934 : /* find_all_inheritors already got lock */
6935 138 : childrel = relation_open(childrelid, NoLock);
6936 138 : CheckAlterTableIsSafe(childrel);
6937 138 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
6938 138 : relation_close(childrel, NoLock);
6939 : }
6940 : }
6941 917 : }
6942 :
6943 : /*
6944 : * Obtain list of partitions of the given table, locking them all at the given
6945 : * lockmode and ensuring that they all pass CheckAlterTableIsSafe.
6946 : *
6947 : * This function is a no-op if the given relation is not a partitioned table;
6948 : * in particular, nothing is done if it's a legacy inheritance parent.
6949 : */
6950 : static void
6951 581 : ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode)
6952 : {
6953 581 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6954 : {
6955 : List *inh;
6956 : ListCell *cell;
6957 :
6958 121 : inh = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
6959 : /* first element is the parent rel; must ignore it */
6960 398 : for_each_from(cell, inh, 1)
6961 : {
6962 : Relation childrel;
6963 :
6964 : /* find_all_inheritors already got lock */
6965 281 : childrel = table_open(lfirst_oid(cell), NoLock);
6966 281 : CheckAlterTableIsSafe(childrel);
6967 277 : table_close(childrel, NoLock);
6968 : }
6969 117 : list_free(inh);
6970 : }
6971 577 : }
6972 :
6973 : /*
6974 : * ATTypedTableRecursion
6975 : *
6976 : * Propagate ALTER TYPE operations to the typed tables of that type.
6977 : * Also check the RESTRICT/CASCADE behavior. Given CASCADE, also permit
6978 : * recursion to inheritance children of the typed tables.
6979 : */
6980 : static void
6981 129 : ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
6982 : LOCKMODE lockmode, AlterTableUtilityContext *context)
6983 : {
6984 : ListCell *child;
6985 : List *children;
6986 :
6987 : Assert(rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
6988 :
6989 129 : children = find_typed_table_dependencies(rel->rd_rel->reltype,
6990 129 : RelationGetRelationName(rel),
6991 : cmd->behavior);
6992 :
6993 137 : foreach(child, children)
6994 : {
6995 20 : Oid childrelid = lfirst_oid(child);
6996 : Relation childrel;
6997 :
6998 20 : childrel = relation_open(childrelid, lockmode);
6999 20 : CheckAlterTableIsSafe(childrel);
7000 20 : ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode, context);
7001 20 : relation_close(childrel, NoLock);
7002 : }
7003 117 : }
7004 :
7005 :
7006 : /*
7007 : * find_composite_type_dependencies
7008 : *
7009 : * Check to see if the type "typeOid" is being used as a column in some table
7010 : * (possibly nested several levels deep in composite types, arrays, etc!).
7011 : * Eventually, we'd like to propagate the check or rewrite operation
7012 : * into such tables, but for now, just error out if we find any.
7013 : *
7014 : * Caller should provide either the associated relation of a rowtype,
7015 : * or a type name (not both) for use in the error message, if any.
7016 : *
7017 : * Note that "typeOid" is not necessarily a composite type; it could also be
7018 : * another container type such as an array or range, or a domain over one of
7019 : * these things. The name of this function is therefore somewhat historical,
7020 : * but it's not worth changing.
7021 : *
7022 : * We assume that functions and views depending on the type are not reasons
7023 : * to reject the ALTER. (How safe is this really?)
7024 : */
7025 : void
7026 3356 : find_composite_type_dependencies(Oid typeOid, Relation origRelation,
7027 : const char *origTypeName)
7028 : {
7029 : Relation depRel;
7030 : ScanKeyData key[2];
7031 : SysScanDesc depScan;
7032 : HeapTuple depTup;
7033 :
7034 : /* since this function recurses, it could be driven to stack overflow */
7035 3356 : check_stack_depth();
7036 :
7037 : /*
7038 : * We scan pg_depend to find those things that depend on the given type.
7039 : * (We assume we can ignore refobjsubid for a type.)
7040 : */
7041 3356 : depRel = table_open(DependRelationId, AccessShareLock);
7042 :
7043 3356 : ScanKeyInit(&key[0],
7044 : Anum_pg_depend_refclassid,
7045 : BTEqualStrategyNumber, F_OIDEQ,
7046 : ObjectIdGetDatum(TypeRelationId));
7047 3356 : ScanKeyInit(&key[1],
7048 : Anum_pg_depend_refobjid,
7049 : BTEqualStrategyNumber, F_OIDEQ,
7050 : ObjectIdGetDatum(typeOid));
7051 :
7052 3356 : depScan = systable_beginscan(depRel, DependReferenceIndexId, true,
7053 : NULL, 2, key);
7054 :
7055 5145 : while (HeapTupleIsValid(depTup = systable_getnext(depScan)))
7056 : {
7057 1893 : Form_pg_depend pg_depend = (Form_pg_depend) GETSTRUCT(depTup);
7058 : Relation rel;
7059 : TupleDesc tupleDesc;
7060 : Form_pg_attribute att;
7061 :
7062 : /* Check for directly dependent types */
7063 1893 : if (pg_depend->classid == TypeRelationId)
7064 : {
7065 : /*
7066 : * This must be an array, domain, or range containing the given
7067 : * type, so recursively check for uses of this type. Note that
7068 : * any error message will mention the original type not the
7069 : * container; this is intentional.
7070 : */
7071 1623 : find_composite_type_dependencies(pg_depend->objid,
7072 : origRelation, origTypeName);
7073 1607 : continue;
7074 : }
7075 :
7076 : /* Else, ignore dependees that aren't relations */
7077 270 : if (pg_depend->classid != RelationRelationId)
7078 81 : continue;
7079 :
7080 189 : rel = relation_open(pg_depend->objid, AccessShareLock);
7081 189 : tupleDesc = RelationGetDescr(rel);
7082 :
7083 : /*
7084 : * If objsubid identifies a specific column, refer to that in error
7085 : * messages. Otherwise, search to see if there's a user column of the
7086 : * type. (We assume system columns are never of interesting types.)
7087 : * The search is needed because an index containing an expression
7088 : * column of the target type will just be recorded as a whole-relation
7089 : * dependency. If we do not find a column of the type, the dependency
7090 : * must indicate that the type is transiently referenced in an index
7091 : * expression but not stored on disk, which we assume is OK, just as
7092 : * we do for references in views. (It could also be that the target
7093 : * type is embedded in some container type that is stored in an index
7094 : * column, but the previous recursion should catch such cases.)
7095 : */
7096 189 : if (pg_depend->objsubid > 0 && pg_depend->objsubid <= tupleDesc->natts)
7097 84 : att = TupleDescAttr(tupleDesc, pg_depend->objsubid - 1);
7098 : else
7099 : {
7100 105 : att = NULL;
7101 270 : for (int attno = 1; attno <= tupleDesc->natts; attno++)
7102 : {
7103 169 : att = TupleDescAttr(tupleDesc, attno - 1);
7104 169 : if (att->atttypid == typeOid && !att->attisdropped)
7105 4 : break;
7106 165 : att = NULL;
7107 : }
7108 105 : if (att == NULL)
7109 : {
7110 : /* No such column, so assume OK */
7111 101 : relation_close(rel, AccessShareLock);
7112 101 : continue;
7113 : }
7114 : }
7115 :
7116 : /*
7117 : * We definitely should reject if the relation has storage. If it's
7118 : * partitioned, then perhaps we don't have to reject: if there are
7119 : * partitions then we'll fail when we find one, else there is no
7120 : * stored data to worry about. However, it's possible that the type
7121 : * change would affect conclusions about whether the type is sortable
7122 : * or hashable and thus (if it's a partitioning column) break the
7123 : * partitioning rule. For now, reject for partitioned rels too.
7124 : */
7125 88 : if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind) ||
7126 0 : RELKIND_HAS_PARTITIONS(rel->rd_rel->relkind))
7127 : {
7128 88 : if (origTypeName)
7129 20 : ereport(ERROR,
7130 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7131 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7132 : origTypeName,
7133 : RelationGetRelationName(rel),
7134 : NameStr(att->attname))));
7135 68 : else if (origRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7136 12 : ereport(ERROR,
7137 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7138 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7139 : RelationGetRelationName(origRelation),
7140 : RelationGetRelationName(rel),
7141 : NameStr(att->attname))));
7142 56 : else if (origRelation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
7143 4 : ereport(ERROR,
7144 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7145 : errmsg("cannot alter foreign table \"%s\" because column \"%s.%s\" uses its row type",
7146 : RelationGetRelationName(origRelation),
7147 : RelationGetRelationName(rel),
7148 : NameStr(att->attname))));
7149 : else
7150 52 : ereport(ERROR,
7151 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7152 : errmsg("cannot alter table \"%s\" because column \"%s.%s\" uses its row type",
7153 : RelationGetRelationName(origRelation),
7154 : RelationGetRelationName(rel),
7155 : NameStr(att->attname))));
7156 : }
7157 0 : else if (OidIsValid(rel->rd_rel->reltype))
7158 : {
7159 : /*
7160 : * A view or composite type itself isn't a problem, but we must
7161 : * recursively check for indirect dependencies via its rowtype.
7162 : */
7163 0 : find_composite_type_dependencies(rel->rd_rel->reltype,
7164 : origRelation, origTypeName);
7165 : }
7166 :
7167 0 : relation_close(rel, AccessShareLock);
7168 : }
7169 :
7170 3252 : systable_endscan(depScan);
7171 :
7172 3252 : relation_close(depRel, AccessShareLock);
7173 3252 : }
7174 :
7175 :
7176 : /*
7177 : * find_typed_table_dependencies
7178 : *
7179 : * Check to see if a composite type is being used as the type of a
7180 : * typed table. Abort if any are found and behavior is RESTRICT.
7181 : * Else return the list of tables.
7182 : */
7183 : static List *
7184 145 : find_typed_table_dependencies(Oid typeOid, const char *typeName, DropBehavior behavior)
7185 : {
7186 : Relation classRel;
7187 : ScanKeyData key[1];
7188 : TableScanDesc scan;
7189 : HeapTuple tuple;
7190 145 : List *result = NIL;
7191 :
7192 145 : classRel = table_open(RelationRelationId, AccessShareLock);
7193 :
7194 145 : ScanKeyInit(&key[0],
7195 : Anum_pg_class_reloftype,
7196 : BTEqualStrategyNumber, F_OIDEQ,
7197 : ObjectIdGetDatum(typeOid));
7198 :
7199 145 : scan = table_beginscan_catalog(classRel, 1, key);
7200 :
7201 169 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
7202 : {
7203 40 : Form_pg_class classform = (Form_pg_class) GETSTRUCT(tuple);
7204 :
7205 40 : if (behavior == DROP_RESTRICT)
7206 16 : ereport(ERROR,
7207 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
7208 : errmsg("cannot alter type \"%s\" because it is the type of a typed table",
7209 : typeName),
7210 : errhint("Use ALTER ... CASCADE to alter the typed tables too.")));
7211 : else
7212 24 : result = lappend_oid(result, classform->oid);
7213 : }
7214 :
7215 129 : table_endscan(scan);
7216 129 : table_close(classRel, AccessShareLock);
7217 :
7218 129 : return result;
7219 : }
7220 :
7221 :
7222 : /*
7223 : * check_of_type
7224 : *
7225 : * Check whether a type is suitable for CREATE TABLE OF/ALTER TABLE OF. If it
7226 : * isn't suitable, throw an error. Currently, we require that the type
7227 : * originated with CREATE TYPE AS. We could support any row type, but doing so
7228 : * would require handling a number of extra corner cases in the DDL commands.
7229 : * (Also, allowing domain-over-composite would open up a can of worms about
7230 : * whether and how the domain's constraints should apply to derived tables.)
7231 : */
7232 : void
7233 119 : check_of_type(HeapTuple typetuple)
7234 : {
7235 119 : Form_pg_type typ = (Form_pg_type) GETSTRUCT(typetuple);
7236 119 : bool typeOk = false;
7237 :
7238 119 : if (typ->typtype == TYPTYPE_COMPOSITE)
7239 : {
7240 : Relation typeRelation;
7241 :
7242 : Assert(OidIsValid(typ->typrelid));
7243 115 : typeRelation = relation_open(typ->typrelid, AccessShareLock);
7244 115 : typeOk = (typeRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
7245 :
7246 : /*
7247 : * Close the parent rel, but keep our AccessShareLock on it until xact
7248 : * commit. That will prevent someone else from deleting or ALTERing
7249 : * the type before the typed table creation/conversion commits.
7250 : */
7251 115 : relation_close(typeRelation, NoLock);
7252 :
7253 115 : if (!typeOk)
7254 4 : ereport(ERROR,
7255 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7256 : errmsg("type %s is the row type of another table",
7257 : format_type_be(typ->oid)),
7258 : errdetail("A typed table must use a stand-alone composite type created with CREATE TYPE.")));
7259 : }
7260 : else
7261 4 : ereport(ERROR,
7262 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7263 : errmsg("type %s is not a composite type",
7264 : format_type_be(typ->oid))));
7265 111 : }
7266 :
7267 :
7268 : /*
7269 : * ALTER TABLE ADD COLUMN
7270 : *
7271 : * Adds an additional attribute to a relation making the assumption that
7272 : * CHECK, NOT NULL, and FOREIGN KEY constraints will be removed from the
7273 : * AT_AddColumn AlterTableCmd by parse_utilcmd.c and added as independent
7274 : * AlterTableCmd's.
7275 : *
7276 : * ADD COLUMN cannot use the normal ALTER TABLE recursion mechanism, because we
7277 : * have to decide at runtime whether to recurse or not depending on whether we
7278 : * actually add a column or merely merge with an existing column. (We can't
7279 : * check this in a static pre-pass because it won't handle multiple inheritance
7280 : * situations correctly.)
7281 : */
7282 : static void
7283 1638 : ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
7284 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
7285 : AlterTableUtilityContext *context)
7286 : {
7287 1638 : if (rel->rd_rel->reloftype && !recursing)
7288 4 : ereport(ERROR,
7289 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7290 : errmsg("cannot add column to typed table")));
7291 :
7292 1634 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7293 42 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
7294 :
7295 1630 : if (recurse && !is_view)
7296 1555 : cmd->recurse = true;
7297 1630 : }
7298 :
7299 : /*
7300 : * Add a column to a table. The return value is the address of the
7301 : * new column in the parent relation.
7302 : *
7303 : * cmd is pass-by-ref so that we can replace it with the parse-transformed
7304 : * copy (but that happens only after we check for IF NOT EXISTS).
7305 : */
7306 : static ObjectAddress
7307 2140 : ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
7308 : AlterTableCmd **cmd, bool recurse, bool recursing,
7309 : LOCKMODE lockmode, AlterTablePass cur_pass,
7310 : AlterTableUtilityContext *context)
7311 : {
7312 2140 : Oid myrelid = RelationGetRelid(rel);
7313 2140 : ColumnDef *colDef = castNode(ColumnDef, (*cmd)->def);
7314 2140 : bool if_not_exists = (*cmd)->missing_ok;
7315 : Relation pgclass,
7316 : attrdesc;
7317 : HeapTuple reltup;
7318 : Form_pg_class relform;
7319 : Form_pg_attribute attribute;
7320 : int newattnum;
7321 : char relkind;
7322 : Expr *defval;
7323 : List *children;
7324 : ListCell *child;
7325 : AlterTableCmd *childcmd;
7326 : ObjectAddress address;
7327 : TupleDesc tupdesc;
7328 :
7329 : /* since this function recurses, it could be driven to stack overflow */
7330 2140 : check_stack_depth();
7331 :
7332 : /* At top level, permission check was done in ATPrepCmd, else do it */
7333 2140 : if (recursing)
7334 514 : ATSimplePermissions((*cmd)->subtype, rel,
7335 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
7336 :
7337 2140 : if (rel->rd_rel->relispartition && !recursing)
7338 8 : ereport(ERROR,
7339 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7340 : errmsg("cannot add column to a partition")));
7341 :
7342 2132 : attrdesc = table_open(AttributeRelationId, RowExclusiveLock);
7343 :
7344 : /*
7345 : * Are we adding the column to a recursion child? If so, check whether to
7346 : * merge with an existing definition for the column. If we do merge, we
7347 : * must not recurse. Children will already have the column, and recursing
7348 : * into them would mess up attinhcount.
7349 : */
7350 2132 : if (colDef->inhcount > 0)
7351 : {
7352 : HeapTuple tuple;
7353 :
7354 : /* Does child already have a column by this name? */
7355 514 : tuple = SearchSysCacheCopyAttName(myrelid, colDef->colname);
7356 514 : if (HeapTupleIsValid(tuple))
7357 : {
7358 40 : Form_pg_attribute childatt = (Form_pg_attribute) GETSTRUCT(tuple);
7359 : Oid ctypeId;
7360 : int32 ctypmod;
7361 : Oid ccollid;
7362 :
7363 : /* Child column must match on type, typmod, and collation */
7364 40 : typenameTypeIdAndMod(NULL, colDef->typeName, &ctypeId, &ctypmod);
7365 40 : if (ctypeId != childatt->atttypid ||
7366 40 : ctypmod != childatt->atttypmod)
7367 0 : ereport(ERROR,
7368 : (errcode(ERRCODE_DATATYPE_MISMATCH),
7369 : errmsg("child table \"%s\" has different type for column \"%s\"",
7370 : RelationGetRelationName(rel), colDef->colname)));
7371 40 : ccollid = GetColumnDefCollation(NULL, colDef, ctypeId);
7372 40 : if (ccollid != childatt->attcollation)
7373 0 : ereport(ERROR,
7374 : (errcode(ERRCODE_COLLATION_MISMATCH),
7375 : errmsg("child table \"%s\" has different collation for column \"%s\"",
7376 : RelationGetRelationName(rel), colDef->colname),
7377 : errdetail("\"%s\" versus \"%s\"",
7378 : get_collation_name(ccollid),
7379 : get_collation_name(childatt->attcollation))));
7380 :
7381 : /* Bump the existing child att's inhcount */
7382 40 : if (pg_add_s16_overflow(childatt->attinhcount, 1,
7383 : &childatt->attinhcount))
7384 0 : ereport(ERROR,
7385 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7386 : errmsg("too many inheritance parents"));
7387 40 : CatalogTupleUpdate(attrdesc, &tuple->t_self, tuple);
7388 :
7389 40 : heap_freetuple(tuple);
7390 :
7391 : /* Inform the user about the merge */
7392 40 : ereport(NOTICE,
7393 : (errmsg("merging definition of column \"%s\" for child \"%s\"",
7394 : colDef->colname, RelationGetRelationName(rel))));
7395 :
7396 40 : table_close(attrdesc, RowExclusiveLock);
7397 :
7398 : /* Make the child column change visible */
7399 40 : CommandCounterIncrement();
7400 :
7401 40 : return InvalidObjectAddress;
7402 : }
7403 : }
7404 :
7405 : /* skip if the name already exists and if_not_exists is true */
7406 2092 : if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
7407 : {
7408 44 : table_close(attrdesc, RowExclusiveLock);
7409 44 : return InvalidObjectAddress;
7410 : }
7411 :
7412 : /*
7413 : * Okay, we need to add the column, so go ahead and do parse
7414 : * transformation. This can result in queueing up, or even immediately
7415 : * executing, subsidiary operations (such as creation of unique indexes);
7416 : * so we mustn't do it until we have made the if_not_exists check.
7417 : *
7418 : * When recursing, the command was already transformed and we needn't do
7419 : * so again. Also, if context isn't given we can't transform. (That
7420 : * currently happens only for AT_AddColumnToView; we expect that view.c
7421 : * passed us a ColumnDef that doesn't need work.)
7422 : */
7423 2028 : if (context != NULL && !recursing)
7424 : {
7425 1533 : *cmd = ATParseTransformCmd(wqueue, tab, rel, *cmd, recurse, lockmode,
7426 : cur_pass, context);
7427 : Assert(*cmd != NULL);
7428 1529 : colDef = castNode(ColumnDef, (*cmd)->def);
7429 : }
7430 :
7431 : /*
7432 : * Regular inheritance children are independent enough not to inherit the
7433 : * identity column from parent hence cannot recursively add identity
7434 : * column if the table has inheritance children.
7435 : *
7436 : * Partitions, on the other hand, are integral part of a partitioned table
7437 : * and inherit identity column. Hence propagate identity column down the
7438 : * partition hierarchy.
7439 : */
7440 2024 : if (colDef->identity &&
7441 36 : recurse &&
7442 68 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE &&
7443 32 : find_inheritance_children(myrelid, NoLock) != NIL)
7444 4 : ereport(ERROR,
7445 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7446 : errmsg("cannot recursively add identity column to table that has child tables")));
7447 :
7448 2020 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
7449 :
7450 2020 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
7451 2020 : if (!HeapTupleIsValid(reltup))
7452 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
7453 2020 : relform = (Form_pg_class) GETSTRUCT(reltup);
7454 2020 : relkind = relform->relkind;
7455 :
7456 : /* Determine the new attribute's number */
7457 2020 : newattnum = relform->relnatts + 1;
7458 2020 : if (newattnum > MaxHeapAttributeNumber)
7459 0 : ereport(ERROR,
7460 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
7461 : errmsg("tables can have at most %d columns",
7462 : MaxHeapAttributeNumber)));
7463 :
7464 : /*
7465 : * Construct new attribute's pg_attribute entry.
7466 : */
7467 2020 : tupdesc = BuildDescForRelation(list_make1(colDef));
7468 :
7469 2012 : attribute = TupleDescAttr(tupdesc, 0);
7470 :
7471 : /* Fix up attribute number */
7472 2012 : attribute->attnum = newattnum;
7473 :
7474 : /* make sure datatype is legal for a column */
7475 4024 : CheckAttributeType(NameStr(attribute->attname), attribute->atttypid, attribute->attcollation,
7476 2012 : list_make1_oid(rel->rd_rel->reltype),
7477 2012 : (attribute->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
7478 :
7479 1980 : InsertPgAttributeTuples(attrdesc, tupdesc, myrelid, NULL, NULL);
7480 :
7481 1980 : table_close(attrdesc, RowExclusiveLock);
7482 :
7483 : /*
7484 : * Update pg_class tuple as appropriate
7485 : */
7486 1980 : relform->relnatts = newattnum;
7487 :
7488 1980 : CatalogTupleUpdate(pgclass, &reltup->t_self, reltup);
7489 :
7490 1980 : heap_freetuple(reltup);
7491 :
7492 : /* Post creation hook for new attribute */
7493 1980 : InvokeObjectPostCreateHook(RelationRelationId, myrelid, newattnum);
7494 :
7495 1980 : table_close(pgclass, RowExclusiveLock);
7496 :
7497 : /* Make the attribute's catalog entry visible */
7498 1980 : CommandCounterIncrement();
7499 :
7500 : /*
7501 : * Store the DEFAULT, if any, in the catalogs
7502 : */
7503 1980 : if (colDef->raw_default)
7504 : {
7505 : RawColumnDefault *rawEnt;
7506 :
7507 766 : rawEnt = palloc_object(RawColumnDefault);
7508 766 : rawEnt->attnum = attribute->attnum;
7509 766 : rawEnt->raw_default = copyObject(colDef->raw_default);
7510 766 : rawEnt->generated = colDef->generated;
7511 :
7512 : /*
7513 : * This function is intended for CREATE TABLE, so it processes a
7514 : * _list_ of defaults, but we just do one.
7515 : */
7516 766 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
7517 : false, true, false, NULL);
7518 :
7519 : /* Make the additional catalog changes visible */
7520 678 : CommandCounterIncrement();
7521 : }
7522 :
7523 : /*
7524 : * Tell Phase 3 to fill in the default expression, if there is one.
7525 : *
7526 : * If there is no default, Phase 3 doesn't have to do anything, because
7527 : * that effectively means that the default is NULL. The heap tuple access
7528 : * routines always check for attnum > # of attributes in tuple, and return
7529 : * NULL if so, so without any modification of the tuple data we will get
7530 : * the effect of NULL values in the new column.
7531 : *
7532 : * Note: we use build_column_default, and not just the cooked default
7533 : * returned by AddRelationNewConstraints, so that the right thing happens
7534 : * when a datatype's default applies.
7535 : *
7536 : * Note: it might seem that this should happen at the end of Phase 2, so
7537 : * that the effects of subsequent subcommands can be taken into account.
7538 : * It's intentional that we do it now, though. The new column should be
7539 : * filled according to what is said in the ADD COLUMN subcommand, so that
7540 : * the effects are the same as if this subcommand had been run by itself
7541 : * and the later subcommands had been issued in new ALTER TABLE commands.
7542 : *
7543 : * We can skip this entirely for relations without storage, since Phase 3
7544 : * is certainly not going to touch them.
7545 : */
7546 1892 : if (RELKIND_HAS_STORAGE(relkind))
7547 : {
7548 : bool has_domain_constraints;
7549 1622 : bool has_missing = false;
7550 1622 : bool has_volatile = false;
7551 :
7552 : /*
7553 : * For an identity column, we can't use build_column_default(),
7554 : * because the sequence ownership isn't set yet. So do it manually.
7555 : */
7556 1622 : if (colDef->identity)
7557 : {
7558 28 : NextValueExpr *nve = makeNode(NextValueExpr);
7559 :
7560 28 : nve->seqid = RangeVarGetRelid(colDef->identitySequence, NoLock, false);
7561 28 : nve->typeId = attribute->atttypid;
7562 :
7563 28 : defval = (Expr *) nve;
7564 : }
7565 : else
7566 1594 : defval = (Expr *) build_column_default(rel, attribute->attnum);
7567 :
7568 : has_domain_constraints =
7569 1622 : DomainHasConstraints(attribute->atttypid, &has_volatile);
7570 :
7571 : /*
7572 : * If the domain has volatile constraints, we must do a table rewrite
7573 : * since the constraint result could differ per row and cannot be
7574 : * evaluated once and cached as a missing value.
7575 : */
7576 1622 : if (has_volatile)
7577 12 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7578 :
7579 : /* Build CoerceToDomain(NULL) expression if needed */
7580 1622 : if (!defval && has_domain_constraints)
7581 : {
7582 : Oid baseTypeId;
7583 : int32 baseTypeMod;
7584 : Oid baseTypeColl;
7585 :
7586 12 : baseTypeMod = attribute->atttypmod;
7587 12 : baseTypeId = getBaseTypeAndTypmod(attribute->atttypid, &baseTypeMod);
7588 12 : baseTypeColl = get_typcollation(baseTypeId);
7589 12 : defval = (Expr *) makeNullConst(baseTypeId, baseTypeMod, baseTypeColl);
7590 12 : defval = (Expr *) coerce_to_target_type(NULL,
7591 : (Node *) defval,
7592 : baseTypeId,
7593 : attribute->atttypid,
7594 : attribute->atttypmod,
7595 : COERCION_ASSIGNMENT,
7596 : COERCE_IMPLICIT_CAST,
7597 : -1);
7598 12 : if (defval == NULL) /* should not happen */
7599 0 : elog(ERROR, "failed to coerce base type to domain");
7600 : }
7601 :
7602 1622 : if (defval)
7603 : {
7604 : NewColumnValue *newval;
7605 :
7606 : /* Prepare defval for execution, either here or in Phase 3 */
7607 635 : defval = expression_planner(defval);
7608 :
7609 : /* Add the new default to the newvals list */
7610 635 : newval = palloc0_object(NewColumnValue);
7611 635 : newval->attnum = attribute->attnum;
7612 635 : newval->expr = defval;
7613 635 : newval->is_generated = (colDef->generated != '\0');
7614 :
7615 635 : tab->newvals = lappend(tab->newvals, newval);
7616 :
7617 : /*
7618 : * Attempt to skip a complete table rewrite by storing the
7619 : * specified DEFAULT value outside of the heap. This is only
7620 : * allowed for plain relations and non-generated columns, and the
7621 : * default expression can't be volatile (stable is OK), and the
7622 : * domain constraint expressions can't be volatile (stable is OK).
7623 : *
7624 : * Note that contain_volatile_functions considers CoerceToDomain
7625 : * immutable, so we rely on DomainHasConstraints (called above)
7626 : * rather than checking defval alone.
7627 : *
7628 : * For domains with non-volatile constraints, we evaluate the
7629 : * default using soft error handling: if the constraint check
7630 : * fails (e.g., CHECK(value > 10) with DEFAULT 8), we fall back to
7631 : * a table rewrite. This preserves the historical behavior that
7632 : * such a failure is only raised when the table has rows.
7633 : */
7634 635 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
7635 635 : !colDef->generated &&
7636 510 : !has_volatile &&
7637 498 : !contain_volatile_functions((Node *) defval))
7638 384 : {
7639 : EState *estate;
7640 : ExprState *exprState;
7641 : Datum missingval;
7642 : bool missingIsNull;
7643 384 : ErrorSaveContext escontext = {T_ErrorSaveContext};
7644 :
7645 : /* Evaluate the default expression with soft errors */
7646 384 : estate = CreateExecutorState();
7647 384 : exprState = ExecPrepareExprWithContext(defval, estate,
7648 : (Node *) &escontext);
7649 384 : missingval = ExecEvalExpr(exprState,
7650 384 : GetPerTupleExprContext(estate),
7651 : &missingIsNull);
7652 :
7653 : /*
7654 : * If the domain constraint check failed (via errsave),
7655 : * missingval is unreliable. Fall back to a table rewrite;
7656 : * Phase 3 will re-evaluate with hard errors, so the user gets
7657 : * an error only if the table has rows.
7658 : */
7659 384 : if (escontext.error_occurred)
7660 : {
7661 24 : missingIsNull = true;
7662 24 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7663 : }
7664 :
7665 : /* If it turns out NULL, nothing to do; else store it */
7666 384 : if (!missingIsNull)
7667 : {
7668 360 : StoreAttrMissingVal(rel, attribute->attnum, missingval);
7669 : /* Make the additional catalog change visible */
7670 360 : CommandCounterIncrement();
7671 360 : has_missing = true;
7672 : }
7673 384 : FreeExecutorState(estate);
7674 : }
7675 : else
7676 : {
7677 : /*
7678 : * Failed to use missing mode. We have to do a table rewrite
7679 : * to install the value --- unless it's a virtual generated
7680 : * column.
7681 : */
7682 251 : if (colDef->generated != ATTRIBUTE_GENERATED_VIRTUAL)
7683 182 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7684 : }
7685 : }
7686 :
7687 1622 : if (!has_missing)
7688 : {
7689 : /*
7690 : * If the new column is NOT NULL, and there is no missing value,
7691 : * tell Phase 3 it needs to check for NULLs.
7692 : */
7693 1262 : tab->verify_new_notnull |= colDef->is_not_null;
7694 : }
7695 : }
7696 :
7697 : /*
7698 : * Add needed dependency entries for the new column.
7699 : */
7700 1892 : add_column_datatype_dependency(myrelid, newattnum, attribute->atttypid);
7701 1892 : add_column_collation_dependency(myrelid, newattnum, attribute->attcollation);
7702 :
7703 : /*
7704 : * Propagate to children as appropriate. Unlike most other ALTER
7705 : * routines, we have to do this one level of recursion at a time; we can't
7706 : * use find_all_inheritors to do it in one pass.
7707 : */
7708 : children =
7709 1892 : find_inheritance_children(RelationGetRelid(rel), lockmode);
7710 :
7711 : /*
7712 : * If we are told not to recurse, there had better not be any child
7713 : * tables; else the addition would put them out of step.
7714 : */
7715 1892 : if (children && !recurse)
7716 8 : ereport(ERROR,
7717 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7718 : errmsg("column must be added to child tables too")));
7719 :
7720 : /* Children should see column as singly inherited */
7721 1884 : if (!recursing)
7722 : {
7723 1410 : childcmd = copyObject(*cmd);
7724 1410 : colDef = castNode(ColumnDef, childcmd->def);
7725 1410 : colDef->inhcount = 1;
7726 1410 : colDef->is_local = false;
7727 : }
7728 : else
7729 474 : childcmd = *cmd; /* no need to copy again */
7730 :
7731 2398 : foreach(child, children)
7732 : {
7733 514 : Oid childrelid = lfirst_oid(child);
7734 : Relation childrel;
7735 : AlteredTableInfo *childtab;
7736 :
7737 : /* find_inheritance_children already got lock */
7738 514 : childrel = table_open(childrelid, NoLock);
7739 514 : CheckAlterTableIsSafe(childrel);
7740 :
7741 : /* Find or create work queue entry for this table */
7742 514 : childtab = ATGetQueueEntry(wqueue, childrel);
7743 :
7744 : /* Recurse to child; return value is ignored */
7745 514 : ATExecAddColumn(wqueue, childtab, childrel,
7746 : &childcmd, recurse, true,
7747 : lockmode, cur_pass, context);
7748 :
7749 514 : table_close(childrel, NoLock);
7750 : }
7751 :
7752 1884 : ObjectAddressSubSet(address, RelationRelationId, myrelid, newattnum);
7753 1884 : return address;
7754 : }
7755 :
7756 : /*
7757 : * If a new or renamed column will collide with the name of an existing
7758 : * column and if_not_exists is false then error out, else do nothing.
7759 : */
7760 : static bool
7761 2391 : check_for_column_name_collision(Relation rel, const char *colname,
7762 : bool if_not_exists)
7763 : {
7764 : HeapTuple attTuple;
7765 : int attnum;
7766 :
7767 : /*
7768 : * this test is deliberately not attisdropped-aware, since if one tries to
7769 : * add a column matching a dropped column name, it's gonna fail anyway.
7770 : */
7771 2391 : attTuple = SearchSysCache2(ATTNAME,
7772 : ObjectIdGetDatum(RelationGetRelid(rel)),
7773 : PointerGetDatum(colname));
7774 2391 : if (!HeapTupleIsValid(attTuple))
7775 2319 : return true;
7776 :
7777 72 : attnum = ((Form_pg_attribute) GETSTRUCT(attTuple))->attnum;
7778 72 : ReleaseSysCache(attTuple);
7779 :
7780 : /*
7781 : * We throw a different error message for conflicts with system column
7782 : * names, since they are normally not shown and the user might otherwise
7783 : * be confused about the reason for the conflict.
7784 : */
7785 72 : if (attnum <= 0)
7786 8 : ereport(ERROR,
7787 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7788 : errmsg("column name \"%s\" conflicts with a system column name",
7789 : colname)));
7790 : else
7791 : {
7792 64 : if (if_not_exists)
7793 : {
7794 44 : ereport(NOTICE,
7795 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7796 : errmsg("column \"%s\" of relation \"%s\" already exists, skipping",
7797 : colname, RelationGetRelationName(rel))));
7798 44 : return false;
7799 : }
7800 :
7801 20 : ereport(ERROR,
7802 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7803 : errmsg("column \"%s\" of relation \"%s\" already exists",
7804 : colname, RelationGetRelationName(rel))));
7805 : }
7806 :
7807 : return true;
7808 : }
7809 :
7810 : /*
7811 : * Install a column's dependency on its datatype.
7812 : */
7813 : static void
7814 2656 : add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid)
7815 : {
7816 : ObjectAddress myself,
7817 : referenced;
7818 :
7819 2656 : myself.classId = RelationRelationId;
7820 2656 : myself.objectId = relid;
7821 2656 : myself.objectSubId = attnum;
7822 2656 : referenced.classId = TypeRelationId;
7823 2656 : referenced.objectId = typid;
7824 2656 : referenced.objectSubId = 0;
7825 2656 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7826 2656 : }
7827 :
7828 : /*
7829 : * Install a column's dependency on its collation.
7830 : */
7831 : static void
7832 2656 : add_column_collation_dependency(Oid relid, int32 attnum, Oid collid)
7833 : {
7834 : ObjectAddress myself,
7835 : referenced;
7836 :
7837 : /* We know the default collation is pinned, so don't bother recording it */
7838 2656 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
7839 : {
7840 12 : myself.classId = RelationRelationId;
7841 12 : myself.objectId = relid;
7842 12 : myself.objectSubId = attnum;
7843 12 : referenced.classId = CollationRelationId;
7844 12 : referenced.objectId = collid;
7845 12 : referenced.objectSubId = 0;
7846 12 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7847 : }
7848 2656 : }
7849 :
7850 : /*
7851 : * ALTER TABLE ALTER COLUMN DROP NOT NULL
7852 : *
7853 : * Return the address of the modified column. If the column was already
7854 : * nullable, InvalidObjectAddress is returned.
7855 : */
7856 : static ObjectAddress
7857 177 : ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
7858 : LOCKMODE lockmode)
7859 : {
7860 : HeapTuple tuple;
7861 : HeapTuple conTup;
7862 : Form_pg_attribute attTup;
7863 : AttrNumber attnum;
7864 : Relation attr_rel;
7865 : ObjectAddress address;
7866 :
7867 : /*
7868 : * lookup the attribute
7869 : */
7870 177 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7871 :
7872 177 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
7873 177 : if (!HeapTupleIsValid(tuple))
7874 12 : ereport(ERROR,
7875 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7876 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7877 : colName, RelationGetRelationName(rel))));
7878 165 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
7879 165 : attnum = attTup->attnum;
7880 165 : ObjectAddressSubSet(address, RelationRelationId,
7881 : RelationGetRelid(rel), attnum);
7882 :
7883 : /* If the column is already nullable there's nothing to do. */
7884 165 : if (!attTup->attnotnull)
7885 : {
7886 0 : table_close(attr_rel, RowExclusiveLock);
7887 0 : return InvalidObjectAddress;
7888 : }
7889 :
7890 : /* Prevent them from altering a system attribute */
7891 165 : if (attnum <= 0)
7892 0 : ereport(ERROR,
7893 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7894 : errmsg("cannot alter system column \"%s\"",
7895 : colName)));
7896 :
7897 165 : if (attTup->attidentity)
7898 12 : ereport(ERROR,
7899 : (errcode(ERRCODE_SYNTAX_ERROR),
7900 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
7901 : colName, RelationGetRelationName(rel))));
7902 :
7903 : /*
7904 : * If rel is partition, shouldn't drop NOT NULL if parent has the same.
7905 : */
7906 153 : if (rel->rd_rel->relispartition)
7907 : {
7908 8 : Oid parentId = get_partition_parent(RelationGetRelid(rel), false);
7909 8 : Relation parent = table_open(parentId, AccessShareLock);
7910 8 : TupleDesc tupDesc = RelationGetDescr(parent);
7911 : AttrNumber parent_attnum;
7912 :
7913 8 : parent_attnum = get_attnum(parentId, colName);
7914 8 : if (TupleDescAttr(tupDesc, parent_attnum - 1)->attnotnull)
7915 8 : ereport(ERROR,
7916 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7917 : errmsg("column \"%s\" is marked NOT NULL in parent table",
7918 : colName)));
7919 0 : table_close(parent, AccessShareLock);
7920 : }
7921 :
7922 : /*
7923 : * Find the constraint that makes this column NOT NULL, and drop it.
7924 : * dropconstraint_internal() resets attnotnull.
7925 : */
7926 145 : conTup = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7927 145 : if (conTup == NULL)
7928 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
7929 : colName, RelationGetRelationName(rel));
7930 :
7931 : /* The normal case: we have a pg_constraint row, remove it */
7932 145 : dropconstraint_internal(rel, conTup, DROP_RESTRICT, recurse, false,
7933 : false, lockmode);
7934 109 : heap_freetuple(conTup);
7935 :
7936 109 : InvokeObjectPostAlterHook(RelationRelationId,
7937 : RelationGetRelid(rel), attnum);
7938 :
7939 109 : table_close(attr_rel, RowExclusiveLock);
7940 :
7941 109 : return address;
7942 : }
7943 :
7944 : /*
7945 : * set_attnotnull
7946 : * Helper to update/validate the pg_attribute status of a not-null
7947 : * constraint
7948 : *
7949 : * pg_attribute.attnotnull is set true, if it isn't already.
7950 : * If queue_validation is true, also set up wqueue to validate the constraint.
7951 : * wqueue may be given as NULL when validation is not needed (e.g., on table
7952 : * creation).
7953 : */
7954 : static void
7955 16507 : set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
7956 : bool is_valid, bool queue_validation)
7957 : {
7958 : Form_pg_attribute attr;
7959 : CompactAttribute *thisatt;
7960 :
7961 : Assert(!queue_validation || wqueue);
7962 :
7963 16507 : CheckAlterTableIsSafe(rel);
7964 :
7965 : /*
7966 : * Exit quickly by testing attnotnull from the tupledesc's copy of the
7967 : * attribute.
7968 : */
7969 16507 : attr = TupleDescAttr(RelationGetDescr(rel), attnum - 1);
7970 16507 : if (attr->attisdropped)
7971 0 : return;
7972 :
7973 16507 : if (!attr->attnotnull)
7974 : {
7975 : Relation attr_rel;
7976 : HeapTuple tuple;
7977 :
7978 983 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7979 :
7980 983 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
7981 983 : if (!HeapTupleIsValid(tuple))
7982 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
7983 : attnum, RelationGetRelid(rel));
7984 :
7985 983 : thisatt = TupleDescCompactAttr(RelationGetDescr(rel), attnum - 1);
7986 983 : thisatt->attnullability = ATTNULLABLE_VALID;
7987 :
7988 983 : attr = (Form_pg_attribute) GETSTRUCT(tuple);
7989 :
7990 983 : attr->attnotnull = true;
7991 983 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
7992 :
7993 : /*
7994 : * If the nullness isn't already proven by validated constraints, have
7995 : * ALTER TABLE phase 3 test for it.
7996 : */
7997 983 : if (queue_validation && wqueue &&
7998 816 : !NotNullImpliedByRelConstraints(rel, attr))
7999 : {
8000 : AlteredTableInfo *tab;
8001 :
8002 784 : tab = ATGetQueueEntry(wqueue, rel);
8003 784 : tab->verify_new_notnull = true;
8004 : }
8005 :
8006 983 : CommandCounterIncrement();
8007 :
8008 983 : table_close(attr_rel, RowExclusiveLock);
8009 983 : heap_freetuple(tuple);
8010 : }
8011 : else
8012 : {
8013 15524 : CacheInvalidateRelcache(rel);
8014 : }
8015 : }
8016 :
8017 : /*
8018 : * ALTER TABLE ALTER COLUMN SET NOT NULL
8019 : *
8020 : * Add a not-null constraint to a single table and its children. Returns
8021 : * the address of the constraint added to the parent relation, if one gets
8022 : * added, or InvalidObjectAddress otherwise.
8023 : *
8024 : * We must recurse to child tables during execution, rather than using
8025 : * ALTER TABLE's normal prep-time recursion.
8026 : */
8027 : static ObjectAddress
8028 469 : ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
8029 : bool recurse, bool recursing, LOCKMODE lockmode)
8030 : {
8031 : HeapTuple tuple;
8032 : AttrNumber attnum;
8033 : ObjectAddress address;
8034 : Constraint *constraint;
8035 : CookedConstraint *ccon;
8036 : List *cooked;
8037 469 : bool is_no_inherit = false;
8038 :
8039 : /* Guard against stack overflow due to overly deep inheritance tree. */
8040 469 : check_stack_depth();
8041 :
8042 : /* At top level, permission check was done in ATPrepCmd, else do it */
8043 469 : if (recursing)
8044 : {
8045 197 : ATSimplePermissions(AT_AddConstraint, rel,
8046 : ATT_PARTITIONED_TABLE | ATT_TABLE | ATT_FOREIGN_TABLE);
8047 : Assert(conName != NULL);
8048 : }
8049 :
8050 469 : attnum = get_attnum(RelationGetRelid(rel), colName);
8051 469 : if (attnum == InvalidAttrNumber)
8052 12 : ereport(ERROR,
8053 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8054 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8055 : colName, RelationGetRelationName(rel))));
8056 :
8057 : /* Prevent them from altering a system attribute */
8058 457 : if (attnum <= 0)
8059 0 : ereport(ERROR,
8060 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8061 : errmsg("cannot alter system column \"%s\"",
8062 : colName)));
8063 :
8064 : /* See if there's already a constraint */
8065 457 : tuple = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
8066 457 : if (HeapTupleIsValid(tuple))
8067 : {
8068 105 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
8069 105 : bool changed = false;
8070 :
8071 : /*
8072 : * Don't let a NO INHERIT constraint be changed into inherit.
8073 : */
8074 105 : if (conForm->connoinherit && recurse)
8075 8 : ereport(ERROR,
8076 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8077 : errmsg("cannot change NO INHERIT status of NOT NULL constraint \"%s\" on relation \"%s\"",
8078 : NameStr(conForm->conname),
8079 : RelationGetRelationName(rel)));
8080 :
8081 : /*
8082 : * If we find an appropriate constraint, we're almost done, but just
8083 : * need to change some properties on it: if we're recursing, increment
8084 : * coninhcount; if not, set conislocal if not already set.
8085 : */
8086 97 : if (recursing)
8087 : {
8088 68 : if (pg_add_s16_overflow(conForm->coninhcount, 1,
8089 : &conForm->coninhcount))
8090 0 : ereport(ERROR,
8091 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
8092 : errmsg("too many inheritance parents"));
8093 68 : changed = true;
8094 : }
8095 29 : else if (!conForm->conislocal)
8096 : {
8097 0 : conForm->conislocal = true;
8098 0 : changed = true;
8099 : }
8100 29 : else if (!conForm->convalidated)
8101 : {
8102 : /*
8103 : * Flip attnotnull and convalidated, and also validate the
8104 : * constraint.
8105 : */
8106 16 : return ATExecValidateConstraint(wqueue, rel, NameStr(conForm->conname),
8107 : recurse, recursing, lockmode);
8108 : }
8109 :
8110 81 : if (changed)
8111 : {
8112 : Relation constr_rel;
8113 :
8114 68 : constr_rel = table_open(ConstraintRelationId, RowExclusiveLock);
8115 :
8116 68 : CatalogTupleUpdate(constr_rel, &tuple->t_self, tuple);
8117 68 : ObjectAddressSet(address, ConstraintRelationId, conForm->oid);
8118 68 : table_close(constr_rel, RowExclusiveLock);
8119 : }
8120 :
8121 81 : if (changed)
8122 68 : return address;
8123 : else
8124 13 : return InvalidObjectAddress;
8125 : }
8126 :
8127 : /*
8128 : * If we're asked not to recurse, and children exist, raise an error for
8129 : * partitioned tables. For inheritance, we act as if NO INHERIT had been
8130 : * specified.
8131 : */
8132 372 : if (!recurse &&
8133 20 : find_inheritance_children(RelationGetRelid(rel),
8134 : NoLock) != NIL)
8135 : {
8136 12 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
8137 4 : ereport(ERROR,
8138 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8139 : errmsg("constraint must be added to child tables too"),
8140 : errhint("Do not specify the ONLY keyword."));
8141 : else
8142 8 : is_no_inherit = true;
8143 : }
8144 :
8145 : /*
8146 : * No constraint exists; we must add one. First determine a name to use,
8147 : * if we haven't already.
8148 : */
8149 348 : if (!recursing)
8150 : {
8151 : Assert(conName == NULL);
8152 223 : conName = ChooseConstraintName(RelationGetRelationName(rel),
8153 : colName, "not_null",
8154 223 : RelationGetNamespace(rel),
8155 : NIL);
8156 : }
8157 :
8158 348 : constraint = makeNotNullConstraint(makeString(colName));
8159 348 : constraint->is_no_inherit = is_no_inherit;
8160 348 : constraint->conname = conName;
8161 :
8162 : /* and do it */
8163 348 : cooked = AddRelationNewConstraints(rel, NIL, list_make1(constraint),
8164 348 : false, !recursing, false, NULL);
8165 348 : ccon = linitial(cooked);
8166 348 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
8167 :
8168 : /* Mark pg_attribute.attnotnull for the column and queue validation */
8169 348 : set_attnotnull(wqueue, rel, attnum, true, true);
8170 :
8171 348 : InvokeObjectPostAlterHook(RelationRelationId,
8172 : RelationGetRelid(rel), attnum);
8173 :
8174 : /*
8175 : * Recurse to propagate the constraint to children that don't have one.
8176 : */
8177 348 : if (recurse)
8178 : {
8179 : List *children;
8180 :
8181 332 : children = find_inheritance_children(RelationGetRelid(rel),
8182 : lockmode);
8183 :
8184 817 : foreach_oid(childoid, children)
8185 : {
8186 161 : Relation childrel = table_open(childoid, NoLock);
8187 :
8188 161 : CommandCounterIncrement();
8189 :
8190 161 : ATExecSetNotNull(wqueue, childrel, conName, colName,
8191 : recurse, true, lockmode);
8192 157 : table_close(childrel, NoLock);
8193 : }
8194 : }
8195 :
8196 344 : return address;
8197 : }
8198 :
8199 : /*
8200 : * NotNullImpliedByRelConstraints
8201 : * Does rel's existing constraints imply NOT NULL for the given attribute?
8202 : */
8203 : static bool
8204 816 : NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr)
8205 : {
8206 816 : NullTest *nnulltest = makeNode(NullTest);
8207 :
8208 1632 : nnulltest->arg = (Expr *) makeVar(1,
8209 816 : attr->attnum,
8210 : attr->atttypid,
8211 : attr->atttypmod,
8212 : attr->attcollation,
8213 : 0);
8214 816 : nnulltest->nulltesttype = IS_NOT_NULL;
8215 :
8216 : /*
8217 : * argisrow = false is correct even for a composite column, because
8218 : * attnotnull does not represent a SQL-spec IS NOT NULL test in such a
8219 : * case, just IS DISTINCT FROM NULL.
8220 : */
8221 816 : nnulltest->argisrow = false;
8222 816 : nnulltest->location = -1;
8223 :
8224 816 : if (ConstraintImpliedByRelConstraint(rel, list_make1(nnulltest), NIL))
8225 : {
8226 32 : ereport(DEBUG1,
8227 : (errmsg_internal("existing constraints on column \"%s.%s\" are sufficient to prove that it does not contain nulls",
8228 : RelationGetRelationName(rel), NameStr(attr->attname))));
8229 32 : return true;
8230 : }
8231 :
8232 784 : return false;
8233 : }
8234 :
8235 : /*
8236 : * ALTER TABLE ALTER COLUMN SET/DROP DEFAULT
8237 : *
8238 : * Return the address of the affected column.
8239 : */
8240 : static ObjectAddress
8241 383 : ATExecColumnDefault(Relation rel, const char *colName,
8242 : Node *newDefault, LOCKMODE lockmode)
8243 : {
8244 383 : TupleDesc tupdesc = RelationGetDescr(rel);
8245 : AttrNumber attnum;
8246 : ObjectAddress address;
8247 :
8248 : /*
8249 : * get the number of the attribute
8250 : */
8251 383 : attnum = get_attnum(RelationGetRelid(rel), colName);
8252 383 : if (attnum == InvalidAttrNumber)
8253 20 : ereport(ERROR,
8254 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8255 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8256 : colName, RelationGetRelationName(rel))));
8257 :
8258 : /* Prevent them from altering a system attribute */
8259 363 : if (attnum <= 0)
8260 0 : ereport(ERROR,
8261 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8262 : errmsg("cannot alter system column \"%s\"",
8263 : colName)));
8264 :
8265 363 : if (TupleDescAttr(tupdesc, attnum - 1)->attidentity)
8266 12 : ereport(ERROR,
8267 : (errcode(ERRCODE_SYNTAX_ERROR),
8268 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
8269 : colName, RelationGetRelationName(rel)),
8270 : /* translator: %s is an SQL ALTER command */
8271 : newDefault ? 0 : errhint("Use %s instead.",
8272 : "ALTER TABLE ... ALTER COLUMN ... DROP IDENTITY")));
8273 :
8274 351 : if (TupleDescAttr(tupdesc, attnum - 1)->attgenerated)
8275 8 : ereport(ERROR,
8276 : (errcode(ERRCODE_SYNTAX_ERROR),
8277 : errmsg("column \"%s\" of relation \"%s\" is a generated column",
8278 : colName, RelationGetRelationName(rel)),
8279 : newDefault ?
8280 : /* translator: %s is an SQL ALTER command */
8281 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... SET EXPRESSION") :
8282 : (TupleDescAttr(tupdesc, attnum - 1)->attgenerated == ATTRIBUTE_GENERATED_STORED ?
8283 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION") : 0)));
8284 :
8285 : /*
8286 : * Remove any old default for the column. We use RESTRICT here for
8287 : * safety, but at present we do not expect anything to depend on the
8288 : * default.
8289 : *
8290 : * We treat removing the existing default as an internal operation when it
8291 : * is preparatory to adding a new default, but as a user-initiated
8292 : * operation when the user asked for a drop.
8293 : */
8294 343 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8295 : newDefault != NULL);
8296 :
8297 343 : if (newDefault)
8298 : {
8299 : /* SET DEFAULT */
8300 : RawColumnDefault *rawEnt;
8301 :
8302 227 : rawEnt = palloc_object(RawColumnDefault);
8303 227 : rawEnt->attnum = attnum;
8304 227 : rawEnt->raw_default = newDefault;
8305 227 : rawEnt->generated = '\0';
8306 :
8307 : /*
8308 : * This function is intended for CREATE TABLE, so it processes a
8309 : * _list_ of defaults, but we just do one.
8310 : */
8311 227 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8312 : false, true, false, NULL);
8313 : }
8314 :
8315 339 : ObjectAddressSubSet(address, RelationRelationId,
8316 : RelationGetRelid(rel), attnum);
8317 339 : return address;
8318 : }
8319 :
8320 : /*
8321 : * Add a pre-cooked default expression.
8322 : *
8323 : * Return the address of the affected column.
8324 : */
8325 : static ObjectAddress
8326 53 : ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
8327 : Node *newDefault)
8328 : {
8329 : ObjectAddress address;
8330 :
8331 : /* We assume no checking is required */
8332 :
8333 : /*
8334 : * Remove any old default for the column. We use RESTRICT here for
8335 : * safety, but at present we do not expect anything to depend on the
8336 : * default. (In ordinary cases, there could not be a default in place
8337 : * anyway, but it's possible when combining LIKE with inheritance.)
8338 : */
8339 53 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8340 : true);
8341 :
8342 53 : (void) StoreAttrDefault(rel, attnum, newDefault, true);
8343 :
8344 53 : ObjectAddressSubSet(address, RelationRelationId,
8345 : RelationGetRelid(rel), attnum);
8346 53 : return address;
8347 : }
8348 :
8349 : /*
8350 : * ALTER TABLE ALTER COLUMN ADD IDENTITY
8351 : *
8352 : * Return the address of the affected column.
8353 : */
8354 : static ObjectAddress
8355 103 : ATExecAddIdentity(Relation rel, const char *colName,
8356 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing)
8357 : {
8358 : Relation attrelation;
8359 : HeapTuple tuple;
8360 : Form_pg_attribute attTup;
8361 : AttrNumber attnum;
8362 : ObjectAddress address;
8363 103 : ColumnDef *cdef = castNode(ColumnDef, def);
8364 : bool ispartitioned;
8365 :
8366 103 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8367 103 : if (ispartitioned && !recurse)
8368 4 : ereport(ERROR,
8369 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8370 : errmsg("cannot add identity to a column of only the partitioned table"),
8371 : errhint("Do not specify the ONLY keyword.")));
8372 :
8373 99 : if (rel->rd_rel->relispartition && !recursing)
8374 8 : ereport(ERROR,
8375 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8376 : errmsg("cannot add identity to a column of a partition"));
8377 :
8378 91 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8379 :
8380 91 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8381 91 : if (!HeapTupleIsValid(tuple))
8382 0 : ereport(ERROR,
8383 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8384 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8385 : colName, RelationGetRelationName(rel))));
8386 91 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8387 91 : attnum = attTup->attnum;
8388 :
8389 : /* Can't alter a system attribute */
8390 91 : if (attnum <= 0)
8391 0 : ereport(ERROR,
8392 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8393 : errmsg("cannot alter system column \"%s\"",
8394 : colName)));
8395 :
8396 : /*
8397 : * Creating a column as identity implies NOT NULL, so adding the identity
8398 : * to an existing column that is not NOT NULL would create a state that
8399 : * cannot be reproduced without contortions.
8400 : */
8401 91 : if (!attTup->attnotnull)
8402 4 : ereport(ERROR,
8403 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8404 : errmsg("column \"%s\" of relation \"%s\" must be declared NOT NULL before identity can be added",
8405 : colName, RelationGetRelationName(rel))));
8406 :
8407 : /*
8408 : * On the other hand, if a not-null constraint exists, then verify that
8409 : * it's compatible.
8410 : */
8411 87 : if (attTup->attnotnull)
8412 : {
8413 : HeapTuple contup;
8414 : Form_pg_constraint conForm;
8415 :
8416 87 : contup = findNotNullConstraintAttnum(RelationGetRelid(rel),
8417 : attnum);
8418 87 : if (!HeapTupleIsValid(contup))
8419 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
8420 : colName, RelationGetRelationName(rel));
8421 :
8422 87 : conForm = (Form_pg_constraint) GETSTRUCT(contup);
8423 87 : if (!conForm->convalidated)
8424 4 : ereport(ERROR,
8425 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8426 : errmsg("incompatible NOT VALID constraint \"%s\" on relation \"%s\"",
8427 : NameStr(conForm->conname), RelationGetRelationName(rel)),
8428 : errhint("You might need to validate it using %s.",
8429 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
8430 : }
8431 :
8432 83 : if (attTup->attidentity)
8433 12 : ereport(ERROR,
8434 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8435 : errmsg("column \"%s\" of relation \"%s\" is already an identity column",
8436 : colName, RelationGetRelationName(rel))));
8437 :
8438 71 : if (attTup->atthasdef)
8439 4 : ereport(ERROR,
8440 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8441 : errmsg("column \"%s\" of relation \"%s\" already has a default value",
8442 : colName, RelationGetRelationName(rel))));
8443 :
8444 67 : attTup->attidentity = cdef->identity;
8445 67 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8446 :
8447 67 : InvokeObjectPostAlterHook(RelationRelationId,
8448 : RelationGetRelid(rel),
8449 : attTup->attnum);
8450 67 : ObjectAddressSubSet(address, RelationRelationId,
8451 : RelationGetRelid(rel), attnum);
8452 67 : heap_freetuple(tuple);
8453 :
8454 67 : table_close(attrelation, RowExclusiveLock);
8455 :
8456 : /*
8457 : * Recurse to propagate the identity column to partitions. Identity is
8458 : * not inherited in regular inheritance children.
8459 : */
8460 67 : if (recurse && ispartitioned)
8461 : {
8462 : List *children;
8463 : ListCell *lc;
8464 :
8465 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8466 :
8467 10 : foreach(lc, children)
8468 : {
8469 : Relation childrel;
8470 :
8471 4 : childrel = table_open(lfirst_oid(lc), NoLock);
8472 4 : ATExecAddIdentity(childrel, colName, def, lockmode, recurse, true);
8473 4 : table_close(childrel, NoLock);
8474 : }
8475 : }
8476 :
8477 67 : return address;
8478 : }
8479 :
8480 : /*
8481 : * ALTER TABLE ALTER COLUMN SET { GENERATED or sequence options }
8482 : *
8483 : * Return the address of the affected column.
8484 : */
8485 : static ObjectAddress
8486 49 : ATExecSetIdentity(Relation rel, const char *colName, Node *def,
8487 : LOCKMODE lockmode, bool recurse, bool recursing)
8488 : {
8489 : ListCell *option;
8490 49 : DefElem *generatedEl = NULL;
8491 : HeapTuple tuple;
8492 : Form_pg_attribute attTup;
8493 : AttrNumber attnum;
8494 : Relation attrelation;
8495 : ObjectAddress address;
8496 : bool ispartitioned;
8497 :
8498 49 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8499 49 : if (ispartitioned && !recurse)
8500 4 : ereport(ERROR,
8501 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8502 : errmsg("cannot change identity column of only the partitioned table"),
8503 : errhint("Do not specify the ONLY keyword.")));
8504 :
8505 45 : if (rel->rd_rel->relispartition && !recursing)
8506 8 : ereport(ERROR,
8507 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8508 : errmsg("cannot change identity column of a partition"));
8509 :
8510 66 : foreach(option, castNode(List, def))
8511 : {
8512 29 : DefElem *defel = lfirst_node(DefElem, option);
8513 :
8514 29 : if (strcmp(defel->defname, "generated") == 0)
8515 : {
8516 29 : if (generatedEl)
8517 0 : ereport(ERROR,
8518 : (errcode(ERRCODE_SYNTAX_ERROR),
8519 : errmsg("conflicting or redundant options")));
8520 29 : generatedEl = defel;
8521 : }
8522 : else
8523 0 : elog(ERROR, "option \"%s\" not recognized",
8524 : defel->defname);
8525 : }
8526 :
8527 : /*
8528 : * Even if there is nothing to change here, we run all the checks. There
8529 : * will be a subsequent ALTER SEQUENCE that relies on everything being
8530 : * there.
8531 : */
8532 :
8533 37 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8534 37 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8535 37 : if (!HeapTupleIsValid(tuple))
8536 0 : ereport(ERROR,
8537 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8538 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8539 : colName, RelationGetRelationName(rel))));
8540 :
8541 37 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8542 37 : attnum = attTup->attnum;
8543 :
8544 37 : if (attnum <= 0)
8545 0 : ereport(ERROR,
8546 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8547 : errmsg("cannot alter system column \"%s\"",
8548 : colName)));
8549 :
8550 37 : if (!attTup->attidentity)
8551 4 : ereport(ERROR,
8552 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8553 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8554 : colName, RelationGetRelationName(rel))));
8555 :
8556 33 : if (generatedEl)
8557 : {
8558 29 : attTup->attidentity = defGetInt32(generatedEl);
8559 29 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8560 :
8561 29 : InvokeObjectPostAlterHook(RelationRelationId,
8562 : RelationGetRelid(rel),
8563 : attTup->attnum);
8564 29 : ObjectAddressSubSet(address, RelationRelationId,
8565 : RelationGetRelid(rel), attnum);
8566 : }
8567 : else
8568 4 : address = InvalidObjectAddress;
8569 :
8570 33 : heap_freetuple(tuple);
8571 33 : table_close(attrelation, RowExclusiveLock);
8572 :
8573 : /*
8574 : * Recurse to propagate the identity change to partitions. Identity is not
8575 : * inherited in regular inheritance children.
8576 : */
8577 33 : if (generatedEl && recurse && ispartitioned)
8578 : {
8579 : List *children;
8580 : ListCell *lc;
8581 :
8582 4 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8583 :
8584 12 : foreach(lc, children)
8585 : {
8586 : Relation childrel;
8587 :
8588 8 : childrel = table_open(lfirst_oid(lc), NoLock);
8589 8 : ATExecSetIdentity(childrel, colName, def, lockmode, recurse, true);
8590 8 : table_close(childrel, NoLock);
8591 : }
8592 : }
8593 :
8594 33 : return address;
8595 : }
8596 :
8597 : /*
8598 : * ALTER TABLE ALTER COLUMN DROP IDENTITY
8599 : *
8600 : * Return the address of the affected column.
8601 : */
8602 : static ObjectAddress
8603 61 : ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
8604 : bool recurse, bool recursing)
8605 : {
8606 : HeapTuple tuple;
8607 : Form_pg_attribute attTup;
8608 : AttrNumber attnum;
8609 : Relation attrelation;
8610 : ObjectAddress address;
8611 : Oid seqid;
8612 : ObjectAddress seqaddress;
8613 : bool ispartitioned;
8614 :
8615 61 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8616 61 : if (ispartitioned && !recurse)
8617 4 : ereport(ERROR,
8618 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8619 : errmsg("cannot drop identity from a column of only the partitioned table"),
8620 : errhint("Do not specify the ONLY keyword.")));
8621 :
8622 57 : if (rel->rd_rel->relispartition && !recursing)
8623 4 : ereport(ERROR,
8624 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8625 : errmsg("cannot drop identity from a column of a partition"));
8626 :
8627 53 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8628 53 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8629 53 : if (!HeapTupleIsValid(tuple))
8630 0 : ereport(ERROR,
8631 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8632 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8633 : colName, RelationGetRelationName(rel))));
8634 :
8635 53 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8636 53 : attnum = attTup->attnum;
8637 :
8638 53 : if (attnum <= 0)
8639 0 : ereport(ERROR,
8640 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8641 : errmsg("cannot alter system column \"%s\"",
8642 : colName)));
8643 :
8644 53 : if (!attTup->attidentity)
8645 : {
8646 8 : if (!missing_ok)
8647 4 : ereport(ERROR,
8648 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8649 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8650 : colName, RelationGetRelationName(rel))));
8651 : else
8652 : {
8653 4 : ereport(NOTICE,
8654 : (errmsg("column \"%s\" of relation \"%s\" is not an identity column, skipping",
8655 : colName, RelationGetRelationName(rel))));
8656 4 : heap_freetuple(tuple);
8657 4 : table_close(attrelation, RowExclusiveLock);
8658 4 : return InvalidObjectAddress;
8659 : }
8660 : }
8661 :
8662 45 : attTup->attidentity = '\0';
8663 45 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8664 :
8665 45 : InvokeObjectPostAlterHook(RelationRelationId,
8666 : RelationGetRelid(rel),
8667 : attTup->attnum);
8668 45 : ObjectAddressSubSet(address, RelationRelationId,
8669 : RelationGetRelid(rel), attnum);
8670 45 : heap_freetuple(tuple);
8671 :
8672 45 : table_close(attrelation, RowExclusiveLock);
8673 :
8674 : /*
8675 : * Recurse to drop the identity from column in partitions. Identity is
8676 : * not inherited in regular inheritance children so ignore them.
8677 : */
8678 45 : if (recurse && ispartitioned)
8679 : {
8680 : List *children;
8681 : ListCell *lc;
8682 :
8683 4 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8684 :
8685 8 : foreach(lc, children)
8686 : {
8687 : Relation childrel;
8688 :
8689 4 : childrel = table_open(lfirst_oid(lc), NoLock);
8690 4 : ATExecDropIdentity(childrel, colName, false, lockmode, recurse, true);
8691 4 : table_close(childrel, NoLock);
8692 : }
8693 : }
8694 :
8695 45 : if (!recursing)
8696 : {
8697 : /* drop the internal sequence */
8698 21 : seqid = getIdentitySequence(rel, attnum, false);
8699 21 : deleteDependencyRecordsForClass(RelationRelationId, seqid,
8700 : RelationRelationId, DEPENDENCY_INTERNAL);
8701 21 : CommandCounterIncrement();
8702 21 : seqaddress.classId = RelationRelationId;
8703 21 : seqaddress.objectId = seqid;
8704 21 : seqaddress.objectSubId = 0;
8705 21 : performDeletion(&seqaddress, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
8706 : }
8707 :
8708 45 : return address;
8709 : }
8710 :
8711 : /*
8712 : * ALTER TABLE ALTER COLUMN SET EXPRESSION
8713 : *
8714 : * Return the address of the affected column.
8715 : */
8716 : static ObjectAddress
8717 169 : ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
8718 : Node *newExpr, LOCKMODE lockmode)
8719 : {
8720 : HeapTuple tuple;
8721 : Form_pg_attribute attTup;
8722 : AttrNumber attnum;
8723 : char attgenerated;
8724 : bool rewrite;
8725 : Oid attrdefoid;
8726 : ObjectAddress address;
8727 : Expr *defval;
8728 : NewColumnValue *newval;
8729 : RawColumnDefault *rawEnt;
8730 :
8731 169 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8732 169 : if (!HeapTupleIsValid(tuple))
8733 0 : ereport(ERROR,
8734 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8735 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8736 : colName, RelationGetRelationName(rel))));
8737 :
8738 169 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8739 :
8740 169 : attnum = attTup->attnum;
8741 169 : if (attnum <= 0)
8742 0 : ereport(ERROR,
8743 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8744 : errmsg("cannot alter system column \"%s\"",
8745 : colName)));
8746 :
8747 169 : attgenerated = attTup->attgenerated;
8748 169 : if (!attgenerated)
8749 8 : ereport(ERROR,
8750 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8751 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8752 : colName, RelationGetRelationName(rel))));
8753 :
8754 161 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL && attTup->attnotnull)
8755 16 : tab->verify_new_notnull = true;
8756 :
8757 : /*
8758 : * We need to prevent this because a change of expression could affect a
8759 : * row filter and inject expressions that are not permitted in a row
8760 : * filter. XXX We could try to have a more precise check to catch only
8761 : * publications with row filters, or even re-verify the row filter
8762 : * expressions.
8763 : */
8764 237 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8765 76 : GetRelationIncludedPublications(RelationGetRelid(rel)) != NIL)
8766 4 : ereport(ERROR,
8767 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8768 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns in tables that are part of a publication"),
8769 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8770 : colName, RelationGetRelationName(rel))));
8771 :
8772 157 : rewrite = (attgenerated == ATTRIBUTE_GENERATED_STORED);
8773 :
8774 157 : ReleaseSysCache(tuple);
8775 :
8776 157 : if (rewrite)
8777 : {
8778 : /*
8779 : * Clear all the missing values if we're rewriting the table, since
8780 : * this renders them pointless.
8781 : */
8782 85 : RelationClearMissing(rel);
8783 :
8784 : /* make sure we don't conflict with later attribute modifications */
8785 85 : CommandCounterIncrement();
8786 : }
8787 :
8788 : /*
8789 : * Find everything that depends on the column (constraints, indexes, etc),
8790 : * and record enough information to let us recreate the objects.
8791 : */
8792 157 : RememberAllDependentForRebuilding(tab, AT_SetExpression, rel, attnum, colName);
8793 :
8794 : /*
8795 : * Drop the dependency records of the GENERATED expression, in particular
8796 : * its INTERNAL dependency on the column, which would otherwise cause
8797 : * dependency.c to refuse to perform the deletion.
8798 : */
8799 157 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8800 157 : if (!OidIsValid(attrdefoid))
8801 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8802 : RelationGetRelid(rel), attnum);
8803 157 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8804 :
8805 : /* Make above changes visible */
8806 157 : CommandCounterIncrement();
8807 :
8808 : /*
8809 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8810 : * safety, but at present we do not expect anything to depend on the
8811 : * expression.
8812 : */
8813 157 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8814 : false, false);
8815 :
8816 : /* Prepare to store the new expression, in the catalogs */
8817 157 : rawEnt = palloc_object(RawColumnDefault);
8818 157 : rawEnt->attnum = attnum;
8819 157 : rawEnt->raw_default = newExpr;
8820 157 : rawEnt->generated = attgenerated;
8821 :
8822 : /* Store the generated expression */
8823 157 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8824 : false, true, false, NULL);
8825 :
8826 : /* Make above new expression visible */
8827 157 : CommandCounterIncrement();
8828 :
8829 157 : if (rewrite)
8830 : {
8831 : /* Prepare for table rewrite */
8832 85 : defval = (Expr *) build_column_default(rel, attnum);
8833 :
8834 85 : newval = palloc0_object(NewColumnValue);
8835 85 : newval->attnum = attnum;
8836 85 : newval->expr = expression_planner(defval);
8837 85 : newval->is_generated = true;
8838 :
8839 85 : tab->newvals = lappend(tab->newvals, newval);
8840 85 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
8841 : }
8842 :
8843 : /* Drop any pg_statistic entry for the column */
8844 157 : RemoveStatistics(RelationGetRelid(rel), attnum);
8845 :
8846 157 : InvokeObjectPostAlterHook(RelationRelationId,
8847 : RelationGetRelid(rel), attnum);
8848 :
8849 157 : ObjectAddressSubSet(address, RelationRelationId,
8850 : RelationGetRelid(rel), attnum);
8851 157 : return address;
8852 : }
8853 :
8854 : /*
8855 : * ALTER TABLE ALTER COLUMN DROP EXPRESSION
8856 : */
8857 : static void
8858 57 : ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode)
8859 : {
8860 : /*
8861 : * Reject ONLY if there are child tables. We could implement this, but it
8862 : * is a bit complicated. GENERATED clauses must be attached to the column
8863 : * definition and cannot be added later like DEFAULT, so if a child table
8864 : * has a generation expression that the parent does not have, the child
8865 : * column will necessarily be an attislocal column. So to implement ONLY
8866 : * here, we'd need extra code to update attislocal of the direct child
8867 : * tables, somewhat similar to how DROP COLUMN does it, so that the
8868 : * resulting state can be properly dumped and restored.
8869 : */
8870 73 : if (!recurse &&
8871 16 : find_inheritance_children(RelationGetRelid(rel), lockmode))
8872 8 : ereport(ERROR,
8873 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8874 : errmsg("ALTER TABLE / DROP EXPRESSION must be applied to child tables too")));
8875 :
8876 : /*
8877 : * Cannot drop generation expression from inherited columns.
8878 : */
8879 49 : if (!recursing)
8880 : {
8881 : HeapTuple tuple;
8882 : Form_pg_attribute attTup;
8883 :
8884 41 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), cmd->name);
8885 41 : if (!HeapTupleIsValid(tuple))
8886 0 : ereport(ERROR,
8887 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8888 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8889 : cmd->name, RelationGetRelationName(rel))));
8890 :
8891 41 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8892 :
8893 41 : if (attTup->attinhcount > 0)
8894 8 : ereport(ERROR,
8895 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8896 : errmsg("cannot drop generation expression from inherited column")));
8897 : }
8898 41 : }
8899 :
8900 : /*
8901 : * Return the address of the affected column.
8902 : */
8903 : static ObjectAddress
8904 37 : ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode)
8905 : {
8906 : HeapTuple tuple;
8907 : Form_pg_attribute attTup;
8908 : AttrNumber attnum;
8909 : Relation attrelation;
8910 : Oid attrdefoid;
8911 : ObjectAddress address;
8912 :
8913 37 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8914 37 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8915 37 : if (!HeapTupleIsValid(tuple))
8916 0 : ereport(ERROR,
8917 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8918 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8919 : colName, RelationGetRelationName(rel))));
8920 :
8921 37 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8922 37 : attnum = attTup->attnum;
8923 :
8924 37 : if (attnum <= 0)
8925 0 : ereport(ERROR,
8926 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8927 : errmsg("cannot alter system column \"%s\"",
8928 : colName)));
8929 :
8930 : /*
8931 : * TODO: This could be done, but it would need a table rewrite to
8932 : * materialize the generated values. Note that for the time being, we
8933 : * still error with missing_ok, so that we don't silently leave the column
8934 : * as generated.
8935 : */
8936 37 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8937 8 : ereport(ERROR,
8938 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8939 : errmsg("ALTER TABLE / DROP EXPRESSION is not supported for virtual generated columns"),
8940 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8941 : colName, RelationGetRelationName(rel))));
8942 :
8943 29 : if (!attTup->attgenerated)
8944 : {
8945 16 : if (!missing_ok)
8946 8 : ereport(ERROR,
8947 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8948 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8949 : colName, RelationGetRelationName(rel))));
8950 : else
8951 : {
8952 8 : ereport(NOTICE,
8953 : (errmsg("column \"%s\" of relation \"%s\" is not a generated column, skipping",
8954 : colName, RelationGetRelationName(rel))));
8955 8 : heap_freetuple(tuple);
8956 8 : table_close(attrelation, RowExclusiveLock);
8957 8 : return InvalidObjectAddress;
8958 : }
8959 : }
8960 :
8961 : /*
8962 : * Mark the column as no longer generated. (The atthasdef flag needs to
8963 : * get cleared too, but RemoveAttrDefault will handle that.)
8964 : */
8965 13 : attTup->attgenerated = '\0';
8966 13 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8967 :
8968 13 : InvokeObjectPostAlterHook(RelationRelationId,
8969 : RelationGetRelid(rel),
8970 : attnum);
8971 13 : heap_freetuple(tuple);
8972 :
8973 13 : table_close(attrelation, RowExclusiveLock);
8974 :
8975 : /*
8976 : * Drop the dependency records of the GENERATED expression, in particular
8977 : * its INTERNAL dependency on the column, which would otherwise cause
8978 : * dependency.c to refuse to perform the deletion.
8979 : */
8980 13 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8981 13 : if (!OidIsValid(attrdefoid))
8982 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8983 : RelationGetRelid(rel), attnum);
8984 13 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8985 :
8986 : /* Make above changes visible */
8987 13 : CommandCounterIncrement();
8988 :
8989 : /*
8990 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8991 : * safety, but at present we do not expect anything to depend on the
8992 : * default.
8993 : */
8994 13 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8995 : false, false);
8996 :
8997 13 : ObjectAddressSubSet(address, RelationRelationId,
8998 : RelationGetRelid(rel), attnum);
8999 13 : return address;
9000 : }
9001 :
9002 : /*
9003 : * ALTER TABLE ALTER COLUMN SET STATISTICS
9004 : *
9005 : * Return value is the address of the modified column
9006 : */
9007 : static ObjectAddress
9008 111 : ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
9009 : {
9010 111 : int newtarget = 0;
9011 : bool newtarget_default;
9012 : Relation attrelation;
9013 : HeapTuple tuple,
9014 : newtuple;
9015 : Form_pg_attribute attrtuple;
9016 : AttrNumber attnum;
9017 : ObjectAddress address;
9018 : Datum repl_val[Natts_pg_attribute];
9019 : bool repl_null[Natts_pg_attribute];
9020 : bool repl_repl[Natts_pg_attribute];
9021 :
9022 : /*
9023 : * We allow referencing columns by numbers only for indexes, since table
9024 : * column numbers could contain gaps if columns are later dropped.
9025 : */
9026 111 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
9027 69 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
9028 : !colName)
9029 0 : ereport(ERROR,
9030 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9031 : errmsg("cannot refer to non-index column by number")));
9032 :
9033 : /* -1 was used in previous versions for the default setting */
9034 111 : if (newValue && intVal(newValue) != -1)
9035 : {
9036 80 : newtarget = intVal(newValue);
9037 80 : newtarget_default = false;
9038 : }
9039 : else
9040 31 : newtarget_default = true;
9041 :
9042 111 : if (!newtarget_default)
9043 : {
9044 : /*
9045 : * Limit target to a sane range
9046 : */
9047 80 : if (newtarget < 0)
9048 : {
9049 0 : ereport(ERROR,
9050 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
9051 : errmsg("statistics target %d is too low",
9052 : newtarget)));
9053 : }
9054 80 : else if (newtarget > MAX_STATISTICS_TARGET)
9055 : {
9056 0 : newtarget = MAX_STATISTICS_TARGET;
9057 0 : ereport(WARNING,
9058 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
9059 : errmsg("lowering statistics target to %d",
9060 : newtarget)));
9061 : }
9062 : }
9063 :
9064 111 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9065 :
9066 111 : if (colName)
9067 : {
9068 69 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9069 :
9070 69 : if (!HeapTupleIsValid(tuple))
9071 8 : ereport(ERROR,
9072 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9073 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9074 : colName, RelationGetRelationName(rel))));
9075 : }
9076 : else
9077 : {
9078 42 : tuple = SearchSysCacheAttNum(RelationGetRelid(rel), colNum);
9079 :
9080 42 : if (!HeapTupleIsValid(tuple))
9081 8 : ereport(ERROR,
9082 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9083 : errmsg("column number %d of relation \"%s\" does not exist",
9084 : colNum, RelationGetRelationName(rel))));
9085 : }
9086 :
9087 95 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9088 :
9089 95 : attnum = attrtuple->attnum;
9090 95 : if (attnum <= 0)
9091 0 : ereport(ERROR,
9092 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9093 : errmsg("cannot alter system column \"%s\"",
9094 : colName)));
9095 :
9096 : /*
9097 : * Prevent this as long as the ANALYZE code skips virtual generated
9098 : * columns.
9099 : */
9100 95 : if (attrtuple->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
9101 0 : ereport(ERROR,
9102 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9103 : errmsg("cannot alter statistics on virtual generated column \"%s\"",
9104 : colName)));
9105 :
9106 95 : if (rel->rd_rel->relkind == RELKIND_INDEX ||
9107 61 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
9108 : {
9109 34 : if (attnum > rel->rd_index->indnkeyatts)
9110 4 : ereport(ERROR,
9111 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9112 : errmsg("cannot alter statistics on included column \"%s\" of index \"%s\"",
9113 : NameStr(attrtuple->attname), RelationGetRelationName(rel))));
9114 30 : else if (rel->rd_index->indkey.values[attnum - 1] != 0)
9115 12 : ereport(ERROR,
9116 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9117 : errmsg("cannot alter statistics on non-expression column \"%s\" of index \"%s\"",
9118 : NameStr(attrtuple->attname), RelationGetRelationName(rel)),
9119 : errhint("Alter statistics on table column instead.")));
9120 : }
9121 :
9122 : /* Build new tuple. */
9123 79 : memset(repl_null, false, sizeof(repl_null));
9124 79 : memset(repl_repl, false, sizeof(repl_repl));
9125 79 : if (!newtarget_default)
9126 48 : repl_val[Anum_pg_attribute_attstattarget - 1] = Int16GetDatum(newtarget);
9127 : else
9128 31 : repl_null[Anum_pg_attribute_attstattarget - 1] = true;
9129 79 : repl_repl[Anum_pg_attribute_attstattarget - 1] = true;
9130 79 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9131 : repl_val, repl_null, repl_repl);
9132 79 : CatalogTupleUpdate(attrelation, &tuple->t_self, newtuple);
9133 :
9134 79 : InvokeObjectPostAlterHook(RelationRelationId,
9135 : RelationGetRelid(rel),
9136 : attrtuple->attnum);
9137 79 : ObjectAddressSubSet(address, RelationRelationId,
9138 : RelationGetRelid(rel), attnum);
9139 :
9140 79 : heap_freetuple(newtuple);
9141 :
9142 79 : ReleaseSysCache(tuple);
9143 :
9144 79 : table_close(attrelation, RowExclusiveLock);
9145 :
9146 79 : return address;
9147 : }
9148 :
9149 : /*
9150 : * Return value is the address of the modified column
9151 : */
9152 : static ObjectAddress
9153 21 : ATExecSetOptions(Relation rel, const char *colName, Node *options,
9154 : bool isReset, LOCKMODE lockmode)
9155 : {
9156 : Relation attrelation;
9157 : HeapTuple tuple,
9158 : newtuple;
9159 : Form_pg_attribute attrtuple;
9160 : AttrNumber attnum;
9161 : Datum datum,
9162 : newOptions;
9163 : bool isnull;
9164 : ObjectAddress address;
9165 : Datum repl_val[Natts_pg_attribute];
9166 : bool repl_null[Natts_pg_attribute];
9167 : bool repl_repl[Natts_pg_attribute];
9168 :
9169 21 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9170 :
9171 21 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9172 :
9173 21 : if (!HeapTupleIsValid(tuple))
9174 0 : ereport(ERROR,
9175 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9176 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9177 : colName, RelationGetRelationName(rel))));
9178 21 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9179 :
9180 21 : attnum = attrtuple->attnum;
9181 21 : if (attnum <= 0)
9182 0 : ereport(ERROR,
9183 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9184 : errmsg("cannot alter system column \"%s\"",
9185 : colName)));
9186 :
9187 : /* Generate new proposed attoptions (text array) */
9188 21 : datum = SysCacheGetAttr(ATTNAME, tuple, Anum_pg_attribute_attoptions,
9189 : &isnull);
9190 21 : newOptions = transformRelOptions(isnull ? (Datum) 0 : datum,
9191 : castNode(List, options), NULL, NULL,
9192 : false, isReset);
9193 : /* Validate new options */
9194 21 : (void) attribute_reloptions(newOptions, true);
9195 :
9196 : /* Build new tuple. */
9197 21 : memset(repl_null, false, sizeof(repl_null));
9198 21 : memset(repl_repl, false, sizeof(repl_repl));
9199 21 : if (newOptions != (Datum) 0)
9200 21 : repl_val[Anum_pg_attribute_attoptions - 1] = newOptions;
9201 : else
9202 0 : repl_null[Anum_pg_attribute_attoptions - 1] = true;
9203 21 : repl_repl[Anum_pg_attribute_attoptions - 1] = true;
9204 21 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9205 : repl_val, repl_null, repl_repl);
9206 :
9207 : /* Update system catalog. */
9208 21 : CatalogTupleUpdate(attrelation, &newtuple->t_self, newtuple);
9209 :
9210 21 : InvokeObjectPostAlterHook(RelationRelationId,
9211 : RelationGetRelid(rel),
9212 : attrtuple->attnum);
9213 21 : ObjectAddressSubSet(address, RelationRelationId,
9214 : RelationGetRelid(rel), attnum);
9215 :
9216 21 : heap_freetuple(newtuple);
9217 :
9218 21 : ReleaseSysCache(tuple);
9219 :
9220 21 : table_close(attrelation, RowExclusiveLock);
9221 :
9222 21 : return address;
9223 : }
9224 :
9225 : /*
9226 : * Helper function for ATExecSetStorage and ATExecSetCompression
9227 : *
9228 : * Set the attstorage and/or attcompression fields for index columns
9229 : * associated with the specified table column.
9230 : */
9231 : static void
9232 209 : SetIndexStorageProperties(Relation rel, Relation attrelation,
9233 : AttrNumber attnum,
9234 : bool setstorage, char newstorage,
9235 : bool setcompression, char newcompression,
9236 : LOCKMODE lockmode)
9237 : {
9238 : ListCell *lc;
9239 :
9240 267 : foreach(lc, RelationGetIndexList(rel))
9241 : {
9242 58 : Oid indexoid = lfirst_oid(lc);
9243 : Relation indrel;
9244 58 : AttrNumber indattnum = 0;
9245 : HeapTuple tuple;
9246 :
9247 58 : indrel = index_open(indexoid, lockmode);
9248 :
9249 97 : for (int i = 0; i < indrel->rd_index->indnatts; i++)
9250 : {
9251 62 : if (indrel->rd_index->indkey.values[i] == attnum)
9252 : {
9253 23 : indattnum = i + 1;
9254 23 : break;
9255 : }
9256 : }
9257 :
9258 58 : if (indattnum == 0)
9259 : {
9260 35 : index_close(indrel, lockmode);
9261 35 : continue;
9262 : }
9263 :
9264 23 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(indrel), indattnum);
9265 :
9266 23 : if (HeapTupleIsValid(tuple))
9267 : {
9268 23 : Form_pg_attribute attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9269 :
9270 23 : if (setstorage)
9271 15 : attrtuple->attstorage = newstorage;
9272 :
9273 23 : if (setcompression)
9274 8 : attrtuple->attcompression = newcompression;
9275 :
9276 23 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9277 :
9278 23 : InvokeObjectPostAlterHook(RelationRelationId,
9279 : RelationGetRelid(rel),
9280 : attrtuple->attnum);
9281 :
9282 23 : heap_freetuple(tuple);
9283 : }
9284 :
9285 23 : index_close(indrel, lockmode);
9286 : }
9287 209 : }
9288 :
9289 : /*
9290 : * ALTER TABLE ALTER COLUMN SET STORAGE
9291 : *
9292 : * Return value is the address of the modified column
9293 : */
9294 : static ObjectAddress
9295 173 : ATExecSetStorage(Relation rel, const char *colName, Node *newValue, LOCKMODE lockmode)
9296 : {
9297 : Relation attrelation;
9298 : HeapTuple tuple;
9299 : Form_pg_attribute attrtuple;
9300 : AttrNumber attnum;
9301 : ObjectAddress address;
9302 :
9303 173 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9304 :
9305 173 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
9306 :
9307 173 : if (!HeapTupleIsValid(tuple))
9308 8 : ereport(ERROR,
9309 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9310 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9311 : colName, RelationGetRelationName(rel))));
9312 165 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9313 :
9314 165 : attnum = attrtuple->attnum;
9315 165 : if (attnum <= 0)
9316 0 : ereport(ERROR,
9317 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9318 : errmsg("cannot alter system column \"%s\"",
9319 : colName)));
9320 :
9321 165 : attrtuple->attstorage = GetAttributeStorage(attrtuple->atttypid, strVal(newValue));
9322 :
9323 165 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9324 :
9325 165 : InvokeObjectPostAlterHook(RelationRelationId,
9326 : RelationGetRelid(rel),
9327 : attrtuple->attnum);
9328 :
9329 : /*
9330 : * Apply the change to indexes as well (only for simple index columns,
9331 : * matching behavior of index.c ConstructTupleDescriptor()).
9332 : */
9333 165 : SetIndexStorageProperties(rel, attrelation, attnum,
9334 165 : true, attrtuple->attstorage,
9335 : false, 0,
9336 : lockmode);
9337 :
9338 165 : heap_freetuple(tuple);
9339 :
9340 165 : table_close(attrelation, RowExclusiveLock);
9341 :
9342 165 : ObjectAddressSubSet(address, RelationRelationId,
9343 : RelationGetRelid(rel), attnum);
9344 165 : return address;
9345 : }
9346 :
9347 :
9348 : /*
9349 : * ALTER TABLE DROP COLUMN
9350 : *
9351 : * DROP COLUMN cannot use the normal ALTER TABLE recursion mechanism,
9352 : * because we have to decide at runtime whether to recurse or not depending
9353 : * on whether attinhcount goes to zero or not. (We can't check this in a
9354 : * static pre-pass because it won't handle multiple inheritance situations
9355 : * correctly.)
9356 : */
9357 : static void
9358 1143 : ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
9359 : AlterTableCmd *cmd, LOCKMODE lockmode,
9360 : AlterTableUtilityContext *context)
9361 : {
9362 1143 : if (rel->rd_rel->reloftype && !recursing)
9363 4 : ereport(ERROR,
9364 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
9365 : errmsg("cannot drop column from typed table")));
9366 :
9367 1139 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
9368 54 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
9369 :
9370 1135 : if (recurse)
9371 977 : cmd->recurse = true;
9372 1135 : }
9373 :
9374 : /*
9375 : * Drops column 'colName' from relation 'rel' and returns the address of the
9376 : * dropped column. The column is also dropped (or marked as no longer
9377 : * inherited from relation) from the relation's inheritance children, if any.
9378 : *
9379 : * In the recursive invocations for inheritance child relations, instead of
9380 : * dropping the column directly (if to be dropped at all), its object address
9381 : * is added to 'addrs', which must be non-NULL in such invocations. All
9382 : * columns are dropped at the same time after all the children have been
9383 : * checked recursively.
9384 : */
9385 : static ObjectAddress
9386 1508 : ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
9387 : DropBehavior behavior,
9388 : bool recurse, bool recursing,
9389 : bool missing_ok, LOCKMODE lockmode,
9390 : ObjectAddresses *addrs)
9391 : {
9392 : HeapTuple tuple;
9393 : Form_pg_attribute targetatt;
9394 : AttrNumber attnum;
9395 : List *children;
9396 : ObjectAddress object;
9397 : bool is_expr;
9398 :
9399 : /* At top level, permission check was done in ATPrepCmd, else do it */
9400 1508 : if (recursing)
9401 373 : ATSimplePermissions(AT_DropColumn, rel,
9402 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9403 :
9404 : /* Initialize addrs on the first invocation */
9405 : Assert(!recursing || addrs != NULL);
9406 :
9407 : /* since this function recurses, it could be driven to stack overflow */
9408 1508 : check_stack_depth();
9409 :
9410 1508 : if (!recursing)
9411 1135 : addrs = new_object_addresses();
9412 :
9413 : /*
9414 : * get the number of the attribute
9415 : */
9416 1508 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9417 1508 : if (!HeapTupleIsValid(tuple))
9418 : {
9419 40 : if (!missing_ok)
9420 : {
9421 24 : ereport(ERROR,
9422 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9423 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9424 : colName, RelationGetRelationName(rel))));
9425 : }
9426 : else
9427 : {
9428 16 : ereport(NOTICE,
9429 : (errmsg("column \"%s\" of relation \"%s\" does not exist, skipping",
9430 : colName, RelationGetRelationName(rel))));
9431 16 : return InvalidObjectAddress;
9432 : }
9433 : }
9434 1468 : targetatt = (Form_pg_attribute) GETSTRUCT(tuple);
9435 :
9436 1468 : attnum = targetatt->attnum;
9437 :
9438 : /* Can't drop a system attribute */
9439 1468 : if (attnum <= 0)
9440 4 : ereport(ERROR,
9441 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9442 : errmsg("cannot drop system column \"%s\"",
9443 : colName)));
9444 :
9445 : /*
9446 : * Don't drop inherited columns, unless recursing (presumably from a drop
9447 : * of the parent column)
9448 : */
9449 1464 : if (targetatt->attinhcount > 0 && !recursing)
9450 32 : ereport(ERROR,
9451 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9452 : errmsg("cannot drop inherited column \"%s\"",
9453 : colName)));
9454 :
9455 : /*
9456 : * Don't drop columns used in the partition key, either. (If we let this
9457 : * go through, the key column's dependencies would cause a cascaded drop
9458 : * of the whole table, which is surely not what the user expected.)
9459 : */
9460 1432 : if (has_partition_attrs(rel,
9461 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
9462 : &is_expr))
9463 20 : ereport(ERROR,
9464 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9465 : errmsg("cannot drop column \"%s\" because it is part of the partition key of relation \"%s\"",
9466 : colName, RelationGetRelationName(rel))));
9467 :
9468 1412 : ReleaseSysCache(tuple);
9469 :
9470 : /*
9471 : * Propagate to children as appropriate. Unlike most other ALTER
9472 : * routines, we have to do this one level of recursion at a time; we can't
9473 : * use find_all_inheritors to do it in one pass.
9474 : */
9475 : children =
9476 1412 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9477 :
9478 1412 : if (children)
9479 : {
9480 : Relation attr_rel;
9481 : ListCell *child;
9482 :
9483 : /*
9484 : * In case of a partitioned table, the column must be dropped from the
9485 : * partitions as well.
9486 : */
9487 204 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
9488 4 : ereport(ERROR,
9489 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9490 : errmsg("cannot drop column from only the partitioned table when partitions exist"),
9491 : errhint("Do not specify the ONLY keyword.")));
9492 :
9493 200 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
9494 593 : foreach(child, children)
9495 : {
9496 397 : Oid childrelid = lfirst_oid(child);
9497 : Relation childrel;
9498 : Form_pg_attribute childatt;
9499 :
9500 : /* find_inheritance_children already got lock */
9501 397 : childrel = table_open(childrelid, NoLock);
9502 397 : CheckAlterTableIsSafe(childrel);
9503 :
9504 397 : tuple = SearchSysCacheCopyAttName(childrelid, colName);
9505 397 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
9506 0 : elog(ERROR, "cache lookup failed for attribute \"%s\" of relation %u",
9507 : colName, childrelid);
9508 397 : childatt = (Form_pg_attribute) GETSTRUCT(tuple);
9509 :
9510 397 : if (childatt->attinhcount <= 0) /* shouldn't happen */
9511 0 : elog(ERROR, "relation %u has non-inherited attribute \"%s\"",
9512 : childrelid, colName);
9513 :
9514 397 : if (recurse)
9515 : {
9516 : /*
9517 : * If the child column has other definition sources, just
9518 : * decrement its inheritance count; if not, recurse to delete
9519 : * it.
9520 : */
9521 381 : if (childatt->attinhcount == 1 && !childatt->attislocal)
9522 : {
9523 : /* Time to delete this child column, too */
9524 373 : ATExecDropColumn(wqueue, childrel, colName,
9525 : behavior, true, true,
9526 : false, lockmode, addrs);
9527 : }
9528 : else
9529 : {
9530 : /* Child column must survive my deletion */
9531 8 : childatt->attinhcount--;
9532 :
9533 8 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9534 :
9535 : /* Make update visible */
9536 8 : CommandCounterIncrement();
9537 : }
9538 : }
9539 : else
9540 : {
9541 : /*
9542 : * If we were told to drop ONLY in this table (no recursion),
9543 : * we need to mark the inheritors' attributes as locally
9544 : * defined rather than inherited.
9545 : */
9546 16 : childatt->attinhcount--;
9547 16 : childatt->attislocal = true;
9548 :
9549 16 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9550 :
9551 : /* Make update visible */
9552 16 : CommandCounterIncrement();
9553 : }
9554 :
9555 393 : heap_freetuple(tuple);
9556 :
9557 393 : table_close(childrel, NoLock);
9558 : }
9559 196 : table_close(attr_rel, RowExclusiveLock);
9560 : }
9561 :
9562 : /* Add object to delete */
9563 1404 : object.classId = RelationRelationId;
9564 1404 : object.objectId = RelationGetRelid(rel);
9565 1404 : object.objectSubId = attnum;
9566 1404 : add_exact_object_address(&object, addrs);
9567 :
9568 1404 : if (!recursing)
9569 : {
9570 : /* Recursion has ended, drop everything that was collected */
9571 1035 : performMultipleDeletions(addrs, behavior, 0);
9572 991 : free_object_addresses(addrs);
9573 : }
9574 :
9575 1360 : return object;
9576 : }
9577 :
9578 : /*
9579 : * Prepare to add a primary key on a table, by adding not-null constraints
9580 : * on all columns.
9581 : *
9582 : * The not-null constraints for a primary key must cover the whole inheritance
9583 : * hierarchy (failing to ensure that leads to funny corner cases). For the
9584 : * normal case where we're asked to recurse, this routine checks if the
9585 : * not-null constraints exist already, and if not queues a requirement for
9586 : * them to be created by phase 2.
9587 : *
9588 : * For the case where we're asked not to recurse, we verify that a not-null
9589 : * constraint exists on each column of each (direct) child table, throwing an
9590 : * error if not. Not throwing an error would also work, because a not-null
9591 : * constraint would be created anyway, but it'd cause a silent scan of the
9592 : * child table to verify absence of nulls. We prefer to let the user know so
9593 : * that they can add the constraint manually without having to hold
9594 : * AccessExclusiveLock while at it.
9595 : *
9596 : * However, it's also important that we do not acquire locks on children if
9597 : * the not-null constraints already exist on the parent, to avoid risking
9598 : * deadlocks during parallel pg_restore of PKs on partitioned tables.
9599 : */
9600 : static void
9601 10373 : ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
9602 : bool recurse, LOCKMODE lockmode,
9603 : AlterTableUtilityContext *context)
9604 : {
9605 : Constraint *pkconstr;
9606 10373 : List *children = NIL;
9607 10373 : bool got_children = false;
9608 :
9609 10373 : pkconstr = castNode(Constraint, cmd->def);
9610 10373 : if (pkconstr->contype != CONSTR_PRIMARY)
9611 6113 : return;
9612 :
9613 : /* Verify that columns are not-null, or request that they be made so */
9614 9132 : foreach_node(String, column, pkconstr->keys)
9615 : {
9616 : AlterTableCmd *newcmd;
9617 : Constraint *nnconstr;
9618 : HeapTuple tuple;
9619 :
9620 : /*
9621 : * First check if a suitable constraint exists. If it does, we don't
9622 : * need to request another one. We do need to bail out if it's not
9623 : * valid, though.
9624 : */
9625 652 : tuple = findNotNullConstraint(RelationGetRelid(rel), strVal(column));
9626 652 : if (tuple != NULL)
9627 : {
9628 325 : verifyNotNullPKCompatible(tuple, strVal(column));
9629 :
9630 : /* All good with this one; don't request another */
9631 317 : heap_freetuple(tuple);
9632 317 : continue;
9633 : }
9634 327 : else if (!recurse)
9635 : {
9636 : /*
9637 : * No constraint on this column. Asked not to recurse, we won't
9638 : * create one here, but verify that all children have one.
9639 : */
9640 24 : if (!got_children)
9641 : {
9642 24 : children = find_inheritance_children(RelationGetRelid(rel),
9643 : lockmode);
9644 : /* only search for children on the first time through */
9645 24 : got_children = true;
9646 : }
9647 :
9648 48 : foreach_oid(childrelid, children)
9649 : {
9650 : HeapTuple tup;
9651 :
9652 24 : tup = findNotNullConstraint(childrelid, strVal(column));
9653 24 : if (!tup)
9654 4 : ereport(ERROR,
9655 : errmsg("column \"%s\" of table \"%s\" is not marked NOT NULL",
9656 : strVal(column), get_rel_name(childrelid)));
9657 : /* verify it's good enough */
9658 20 : verifyNotNullPKCompatible(tup, strVal(column));
9659 : }
9660 : }
9661 :
9662 : /* This column is not already not-null, so add it to the queue */
9663 315 : nnconstr = makeNotNullConstraint(column);
9664 :
9665 315 : newcmd = makeNode(AlterTableCmd);
9666 315 : newcmd->subtype = AT_AddConstraint;
9667 : /* note we force recurse=true here; see above */
9668 315 : newcmd->recurse = true;
9669 315 : newcmd->def = (Node *) nnconstr;
9670 :
9671 315 : ATPrepCmd(wqueue, rel, newcmd, true, false, lockmode, context);
9672 : }
9673 : }
9674 :
9675 : /*
9676 : * Verify whether the given not-null constraint is compatible with a
9677 : * primary key. If not, an error is thrown.
9678 : */
9679 : static void
9680 345 : verifyNotNullPKCompatible(HeapTuple tuple, const char *colname)
9681 : {
9682 345 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
9683 :
9684 345 : if (conForm->contype != CONSTRAINT_NOTNULL)
9685 0 : elog(ERROR, "constraint %u is not a not-null constraint", conForm->oid);
9686 :
9687 : /* a NO INHERIT constraint is no good */
9688 345 : if (conForm->connoinherit)
9689 8 : ereport(ERROR,
9690 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9691 : errmsg("cannot create primary key on column \"%s\"", colname),
9692 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9693 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9694 : NameStr(conForm->conname), colname,
9695 : get_rel_name(conForm->conrelid), "NO INHERIT"),
9696 : errhint("You might need to make the existing constraint inheritable using %s.",
9697 : "ALTER TABLE ... ALTER CONSTRAINT ... INHERIT"));
9698 :
9699 : /* an unvalidated constraint is no good */
9700 337 : if (!conForm->convalidated)
9701 8 : ereport(ERROR,
9702 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9703 : errmsg("cannot create primary key on column \"%s\"", colname),
9704 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9705 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9706 : NameStr(conForm->conname), colname,
9707 : get_rel_name(conForm->conrelid), "NOT VALID"),
9708 : errhint("You might need to validate it using %s.",
9709 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
9710 329 : }
9711 :
9712 : /*
9713 : * ALTER TABLE ADD INDEX
9714 : *
9715 : * There is no such command in the grammar, but parse_utilcmd.c converts
9716 : * UNIQUE and PRIMARY KEY constraints into AT_AddIndex subcommands. This lets
9717 : * us schedule creation of the index at the appropriate time during ALTER.
9718 : *
9719 : * Return value is the address of the new index.
9720 : */
9721 : static ObjectAddress
9722 1061 : ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
9723 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9724 : {
9725 : bool check_rights;
9726 : bool skip_build;
9727 : bool quiet;
9728 : ObjectAddress address;
9729 :
9730 : Assert(IsA(stmt, IndexStmt));
9731 : Assert(!stmt->concurrent);
9732 :
9733 : /* The IndexStmt has already been through transformIndexStmt */
9734 : Assert(stmt->transformed);
9735 :
9736 : /* suppress schema rights check when rebuilding existing index */
9737 1061 : check_rights = !is_rebuild;
9738 : /* skip index build if phase 3 will do it or we're reusing an old one */
9739 1061 : skip_build = tab->rewrite > 0 || RelFileNumberIsValid(stmt->oldNumber);
9740 : /* suppress notices when rebuilding existing index */
9741 1061 : quiet = is_rebuild;
9742 :
9743 1061 : address = DefineIndex(NULL,
9744 : RelationGetRelid(rel),
9745 : stmt,
9746 : InvalidOid, /* no predefined OID */
9747 : InvalidOid, /* no parent index */
9748 : InvalidOid, /* no parent constraint */
9749 : -1, /* total_parts unknown */
9750 : true, /* is_alter_table */
9751 : check_rights,
9752 : false, /* check_not_in_use - we did it already */
9753 : skip_build,
9754 : quiet);
9755 :
9756 : /*
9757 : * If TryReuseIndex() stashed a relfilenumber for us, we used it for the
9758 : * new index instead of building from scratch. Restore associated fields.
9759 : * This may store InvalidSubTransactionId in both fields, in which case
9760 : * relcache.c will assume it can rebuild the relcache entry. Hence, do
9761 : * this after the CCI that made catalog rows visible to any rebuild. The
9762 : * DROP of the old edition of this index will have scheduled the storage
9763 : * for deletion at commit, so cancel that pending deletion.
9764 : */
9765 948 : if (RelFileNumberIsValid(stmt->oldNumber))
9766 : {
9767 49 : Relation irel = index_open(address.objectId, NoLock);
9768 :
9769 49 : irel->rd_createSubid = stmt->oldCreateSubid;
9770 49 : irel->rd_firstRelfilelocatorSubid = stmt->oldFirstRelfilelocatorSubid;
9771 49 : RelationPreserveStorage(irel->rd_locator, true);
9772 49 : index_close(irel, NoLock);
9773 : }
9774 :
9775 948 : return address;
9776 : }
9777 :
9778 : /*
9779 : * ALTER TABLE ADD STATISTICS
9780 : *
9781 : * This is no such command in the grammar, but we use this internally to add
9782 : * AT_ReAddStatistics subcommands to rebuild extended statistics after a table
9783 : * column type change.
9784 : */
9785 : static ObjectAddress
9786 53 : ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
9787 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9788 : {
9789 : ObjectAddress address;
9790 :
9791 : Assert(IsA(stmt, CreateStatsStmt));
9792 :
9793 : /* The CreateStatsStmt has already been through transformStatsStmt */
9794 : Assert(stmt->transformed);
9795 :
9796 53 : address = CreateStatistics(stmt, !is_rebuild);
9797 :
9798 53 : return address;
9799 : }
9800 :
9801 : /*
9802 : * ALTER TABLE ADD CONSTRAINT USING INDEX
9803 : *
9804 : * Returns the address of the new constraint.
9805 : */
9806 : static ObjectAddress
9807 6653 : ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
9808 : IndexStmt *stmt, LOCKMODE lockmode)
9809 : {
9810 6653 : Oid index_oid = stmt->indexOid;
9811 : Relation indexRel;
9812 : char *indexName;
9813 : IndexInfo *indexInfo;
9814 : char *constraintName;
9815 : char constraintType;
9816 : ObjectAddress address;
9817 : uint16 flags;
9818 :
9819 : Assert(IsA(stmt, IndexStmt));
9820 : Assert(OidIsValid(index_oid));
9821 : Assert(stmt->isconstraint);
9822 :
9823 : /*
9824 : * Doing this on partitioned tables is not a simple feature to implement,
9825 : * so let's punt for now.
9826 : */
9827 6653 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
9828 4 : ereport(ERROR,
9829 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9830 : errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX is not supported on partitioned tables")));
9831 :
9832 6649 : indexRel = index_open(index_oid, AccessShareLock);
9833 :
9834 6649 : indexName = pstrdup(RelationGetRelationName(indexRel));
9835 :
9836 6649 : indexInfo = BuildIndexInfo(indexRel);
9837 :
9838 : /* this should have been checked at parse time */
9839 6649 : if (!indexInfo->ii_Unique)
9840 0 : elog(ERROR, "index \"%s\" is not unique", indexName);
9841 :
9842 : /*
9843 : * Determine name to assign to constraint. We require a constraint to
9844 : * have the same name as the underlying index; therefore, use the index's
9845 : * existing name as the default constraint name, and if the user
9846 : * explicitly gives some other name for the constraint, rename the index
9847 : * to match.
9848 : */
9849 6649 : constraintName = stmt->idxname;
9850 6649 : if (constraintName == NULL)
9851 6632 : constraintName = indexName;
9852 17 : else if (strcmp(constraintName, indexName) != 0)
9853 : {
9854 13 : ereport(NOTICE,
9855 : (errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index \"%s\" to \"%s\"",
9856 : indexName, constraintName)));
9857 13 : RenameRelationInternal(index_oid, constraintName, false, true);
9858 : }
9859 :
9860 : /* Extra checks needed if making primary key */
9861 6649 : if (stmt->primary)
9862 3721 : index_check_primary_key(rel, indexInfo, true, stmt);
9863 :
9864 : /* Note we currently don't support EXCLUSION constraints here */
9865 6645 : if (stmt->primary)
9866 3717 : constraintType = CONSTRAINT_PRIMARY;
9867 : else
9868 2928 : constraintType = CONSTRAINT_UNIQUE;
9869 :
9870 : /* Create the catalog entries for the constraint */
9871 6645 : flags = INDEX_CONSTR_CREATE_UPDATE_INDEX |
9872 : INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS |
9873 13290 : (stmt->initdeferred ? INDEX_CONSTR_CREATE_INIT_DEFERRED : 0) |
9874 6645 : (stmt->deferrable ? INDEX_CONSTR_CREATE_DEFERRABLE : 0) |
9875 6645 : (stmt->primary ? INDEX_CONSTR_CREATE_MARK_AS_PRIMARY : 0);
9876 :
9877 6645 : address = index_constraint_create(rel,
9878 : index_oid,
9879 : InvalidOid,
9880 : indexInfo,
9881 : constraintName,
9882 : constraintType,
9883 : flags,
9884 : allowSystemTableMods,
9885 : false); /* is_internal */
9886 :
9887 6645 : index_close(indexRel, NoLock);
9888 :
9889 6645 : return address;
9890 : }
9891 :
9892 : /*
9893 : * ALTER TABLE ADD CONSTRAINT
9894 : *
9895 : * Return value is the address of the new constraint; if no constraint was
9896 : * added, InvalidObjectAddress is returned.
9897 : */
9898 : static ObjectAddress
9899 8303 : ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9900 : Constraint *newConstraint, bool recurse, bool is_readd,
9901 : LOCKMODE lockmode)
9902 : {
9903 8303 : ObjectAddress address = InvalidObjectAddress;
9904 :
9905 : Assert(IsA(newConstraint, Constraint));
9906 :
9907 : /*
9908 : * Currently, we only expect to see CONSTR_CHECK, CONSTR_NOTNULL and
9909 : * CONSTR_FOREIGN nodes arriving here (see the preprocessing done in
9910 : * parse_utilcmd.c).
9911 : */
9912 8303 : switch (newConstraint->contype)
9913 : {
9914 6469 : case CONSTR_CHECK:
9915 : case CONSTR_NOTNULL:
9916 : address =
9917 6469 : ATAddCheckNNConstraint(wqueue, tab, rel,
9918 : newConstraint, recurse, false, is_readd,
9919 : lockmode);
9920 6369 : break;
9921 :
9922 1834 : case CONSTR_FOREIGN:
9923 :
9924 : /*
9925 : * Assign or validate constraint name
9926 : */
9927 1834 : if (newConstraint->conname)
9928 : {
9929 757 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
9930 : RelationGetRelid(rel),
9931 757 : newConstraint->conname))
9932 0 : ereport(ERROR,
9933 : (errcode(ERRCODE_DUPLICATE_OBJECT),
9934 : errmsg("constraint \"%s\" for relation \"%s\" already exists",
9935 : newConstraint->conname,
9936 : RelationGetRelationName(rel))));
9937 : }
9938 : else
9939 1077 : newConstraint->conname =
9940 1077 : ChooseConstraintName(RelationGetRelationName(rel),
9941 1077 : ChooseForeignKeyConstraintNameAddition(newConstraint->fk_attrs),
9942 : "fkey",
9943 1077 : RelationGetNamespace(rel),
9944 : NIL);
9945 :
9946 1834 : address = ATAddForeignKeyConstraint(wqueue, tab, rel,
9947 : newConstraint,
9948 : recurse, false,
9949 : lockmode);
9950 1469 : break;
9951 :
9952 0 : default:
9953 0 : elog(ERROR, "unrecognized constraint type: %d",
9954 : (int) newConstraint->contype);
9955 : }
9956 :
9957 7838 : return address;
9958 : }
9959 :
9960 : /*
9961 : * Generate the column-name portion of the constraint name for a new foreign
9962 : * key given the list of column names that reference the referenced
9963 : * table. This will be passed to ChooseConstraintName along with the parent
9964 : * table name and the "fkey" suffix.
9965 : *
9966 : * We know that less than NAMEDATALEN characters will actually be used, so we
9967 : * can truncate the result once we've generated that many.
9968 : *
9969 : * XXX see also ChooseExtendedStatisticNameAddition and
9970 : * ChooseIndexNameAddition.
9971 : */
9972 : static char *
9973 1077 : ChooseForeignKeyConstraintNameAddition(List *colnames)
9974 : {
9975 : char buf[NAMEDATALEN * 2];
9976 1077 : int buflen = 0;
9977 : ListCell *lc;
9978 :
9979 1077 : buf[0] = '\0';
9980 2448 : foreach(lc, colnames)
9981 : {
9982 1371 : const char *name = strVal(lfirst(lc));
9983 :
9984 1371 : if (buflen > 0)
9985 294 : buf[buflen++] = '_'; /* insert _ between names */
9986 :
9987 : /*
9988 : * At this point we have buflen <= NAMEDATALEN. name should be less
9989 : * than NAMEDATALEN already, but use strlcpy for paranoia.
9990 : */
9991 1371 : strlcpy(buf + buflen, name, NAMEDATALEN);
9992 1371 : buflen += strlen(buf + buflen);
9993 1371 : if (buflen >= NAMEDATALEN)
9994 0 : break;
9995 : }
9996 1077 : return pstrdup(buf);
9997 : }
9998 :
9999 : /*
10000 : * Add a check or not-null constraint to a single table and its children.
10001 : * Returns the address of the constraint added to the parent relation,
10002 : * if one gets added, or InvalidObjectAddress otherwise.
10003 : *
10004 : * Subroutine for ATExecAddConstraint.
10005 : *
10006 : * We must recurse to child tables during execution, rather than using
10007 : * ALTER TABLE's normal prep-time recursion. The reason is that all the
10008 : * constraints *must* be given the same name, else they won't be seen as
10009 : * related later. If the user didn't explicitly specify a name, then
10010 : * AddRelationNewConstraints would normally assign different names to the
10011 : * child constraints. To fix that, we must capture the name assigned at
10012 : * the parent table and pass that down.
10013 : */
10014 : static ObjectAddress
10015 7152 : ATAddCheckNNConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
10016 : Constraint *constr, bool recurse, bool recursing,
10017 : bool is_readd, LOCKMODE lockmode)
10018 : {
10019 : List *newcons;
10020 : ListCell *lcon;
10021 : List *children;
10022 : ListCell *child;
10023 7152 : ObjectAddress address = InvalidObjectAddress;
10024 :
10025 : /* Guard against stack overflow due to overly deep inheritance tree. */
10026 7152 : check_stack_depth();
10027 :
10028 : /* At top level, permission check was done in ATPrepCmd, else do it */
10029 7152 : if (recursing)
10030 683 : ATSimplePermissions(AT_AddConstraint, rel,
10031 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
10032 :
10033 : /*
10034 : * Call AddRelationNewConstraints to do the work, making sure it works on
10035 : * a copy of the Constraint so transformExpr can't modify the original. It
10036 : * returns a list of cooked constraints.
10037 : *
10038 : * If the constraint ends up getting merged with a pre-existing one, it's
10039 : * omitted from the returned list, which is what we want: we do not need
10040 : * to do any validation work. That can only happen at child tables,
10041 : * though, since we disallow merging at the top level.
10042 : */
10043 7152 : newcons = AddRelationNewConstraints(rel, NIL,
10044 : list_make1(copyObject(constr)),
10045 7152 : recursing || is_readd, /* allow_merge */
10046 : !recursing, /* is_local */
10047 : is_readd, /* is_internal */
10048 14304 : NULL); /* queryString not available
10049 : * here */
10050 :
10051 : /* we don't expect more than one constraint here */
10052 : Assert(list_length(newcons) <= 1);
10053 :
10054 : /* Add each to-be-validated constraint to Phase 3's queue */
10055 13982 : foreach(lcon, newcons)
10056 : {
10057 6926 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lcon);
10058 :
10059 6926 : if (!ccon->skip_validation && ccon->contype != CONSTR_NOTNULL)
10060 : {
10061 : NewConstraint *newcon;
10062 :
10063 771 : newcon = palloc0_object(NewConstraint);
10064 771 : newcon->name = ccon->name;
10065 771 : newcon->contype = ccon->contype;
10066 771 : newcon->qual = ccon->expr;
10067 :
10068 771 : tab->constraints = lappend(tab->constraints, newcon);
10069 : }
10070 :
10071 : /* Save the actually assigned name if it was defaulted */
10072 6926 : if (constr->conname == NULL)
10073 5504 : constr->conname = ccon->name;
10074 :
10075 : /*
10076 : * If adding a valid not-null constraint, set the pg_attribute flag
10077 : * and tell phase 3 to verify existing rows, if needed. For an
10078 : * invalid constraint, just set attnotnull, without queueing
10079 : * verification.
10080 : */
10081 6926 : if (constr->contype == CONSTR_NOTNULL)
10082 5850 : set_attnotnull(wqueue, rel, ccon->attnum,
10083 5850 : !constr->skip_validation,
10084 5850 : !constr->skip_validation);
10085 :
10086 6926 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
10087 : }
10088 :
10089 : /* At this point we must have a locked-down name to use */
10090 : Assert(newcons == NIL || constr->conname != NULL);
10091 :
10092 : /* Advance command counter in case same table is visited multiple times */
10093 7056 : CommandCounterIncrement();
10094 :
10095 : /*
10096 : * If the constraint got merged with an existing constraint, we're done.
10097 : * We mustn't recurse to child tables in this case, because they've
10098 : * already got the constraint, and visiting them again would lead to an
10099 : * incorrect value for coninhcount.
10100 : */
10101 7056 : if (newcons == NIL)
10102 130 : return address;
10103 :
10104 : /*
10105 : * If adding a NO INHERIT constraint, no need to find our children.
10106 : */
10107 6926 : if (constr->is_no_inherit)
10108 56 : return address;
10109 :
10110 : /*
10111 : * Propagate to children as appropriate. Unlike most other ALTER
10112 : * routines, we have to do this one level of recursion at a time; we can't
10113 : * use find_all_inheritors to do it in one pass.
10114 : */
10115 : children =
10116 6870 : find_inheritance_children(RelationGetRelid(rel), lockmode);
10117 :
10118 : /*
10119 : * Check if ONLY was specified with ALTER TABLE. If so, allow the
10120 : * constraint creation only if there are no children currently. Error out
10121 : * otherwise.
10122 : */
10123 6870 : if (!recurse && children != NIL)
10124 4 : ereport(ERROR,
10125 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10126 : errmsg("constraint must be added to child tables too")));
10127 :
10128 : /*
10129 : * Recurse to create the constraint on each child.
10130 : */
10131 7529 : foreach(child, children)
10132 : {
10133 683 : Oid childrelid = lfirst_oid(child);
10134 : Relation childrel;
10135 : AlteredTableInfo *childtab;
10136 :
10137 : /* find_inheritance_children already got lock */
10138 683 : childrel = table_open(childrelid, NoLock);
10139 683 : CheckAlterTableIsSafe(childrel);
10140 :
10141 : /* Find or create work queue entry for this table */
10142 683 : childtab = ATGetQueueEntry(wqueue, childrel);
10143 :
10144 : /* Recurse to this child */
10145 683 : ATAddCheckNNConstraint(wqueue, childtab, childrel,
10146 : constr, recurse, true, is_readd, lockmode);
10147 :
10148 663 : table_close(childrel, NoLock);
10149 : }
10150 :
10151 6846 : return address;
10152 : }
10153 :
10154 : /*
10155 : * Add a foreign-key constraint to a single table; return the new constraint's
10156 : * address.
10157 : *
10158 : * Subroutine for ATExecAddConstraint. Must already hold exclusive
10159 : * lock on the rel, and have done appropriate validity checks for it.
10160 : * We do permissions checks here, however.
10161 : *
10162 : * When the referenced or referencing tables (or both) are partitioned,
10163 : * multiple pg_constraint rows are required -- one for each partitioned table
10164 : * and each partition on each side (fortunately, not one for every combination
10165 : * thereof). We also need action triggers on each leaf partition on the
10166 : * referenced side, and check triggers on each leaf partition on the
10167 : * referencing side.
10168 : */
10169 : static ObjectAddress
10170 1834 : ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
10171 : Constraint *fkconstraint,
10172 : bool recurse, bool recursing, LOCKMODE lockmode)
10173 : {
10174 : Relation pkrel;
10175 1834 : int16 pkattnum[INDEX_MAX_KEYS] = {0};
10176 1834 : int16 fkattnum[INDEX_MAX_KEYS] = {0};
10177 1834 : Oid pktypoid[INDEX_MAX_KEYS] = {0};
10178 1834 : Oid fktypoid[INDEX_MAX_KEYS] = {0};
10179 1834 : Oid pkcolloid[INDEX_MAX_KEYS] = {0};
10180 1834 : Oid fkcolloid[INDEX_MAX_KEYS] = {0};
10181 1834 : Oid opclasses[INDEX_MAX_KEYS] = {0};
10182 1834 : Oid pfeqoperators[INDEX_MAX_KEYS] = {0};
10183 1834 : Oid ppeqoperators[INDEX_MAX_KEYS] = {0};
10184 1834 : Oid ffeqoperators[INDEX_MAX_KEYS] = {0};
10185 1834 : int16 fkdelsetcols[INDEX_MAX_KEYS] = {0};
10186 : bool with_period;
10187 : bool pk_has_without_overlaps;
10188 : int i;
10189 : int numfks,
10190 : numpks,
10191 : numfkdelsetcols;
10192 : Oid indexOid;
10193 : bool old_check_ok;
10194 : ObjectAddress address;
10195 1834 : ListCell *old_pfeqop_item = list_head(fkconstraint->old_conpfeqop);
10196 :
10197 : /*
10198 : * Grab ShareRowExclusiveLock on the pk table, so that someone doesn't
10199 : * delete rows out from under us.
10200 : */
10201 1834 : if (OidIsValid(fkconstraint->old_pktable_oid))
10202 48 : pkrel = table_open(fkconstraint->old_pktable_oid, ShareRowExclusiveLock);
10203 : else
10204 1786 : pkrel = table_openrv(fkconstraint->pktable, ShareRowExclusiveLock);
10205 :
10206 : /*
10207 : * Validity checks (permission checks wait till we have the column
10208 : * numbers)
10209 : */
10210 1830 : if (!recurse && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10211 4 : ereport(ERROR,
10212 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
10213 : errmsg("cannot use ONLY for foreign key on partitioned table \"%s\" referencing relation \"%s\"",
10214 : RelationGetRelationName(rel),
10215 : RelationGetRelationName(pkrel)));
10216 :
10217 1826 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10218 236 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10219 0 : ereport(ERROR,
10220 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10221 : errmsg("referenced relation \"%s\" is not a table",
10222 : RelationGetRelationName(pkrel))));
10223 :
10224 1826 : if (!allowSystemTableMods && IsSystemRelation(pkrel))
10225 1 : ereport(ERROR,
10226 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
10227 : errmsg("permission denied: \"%s\" is a system catalog",
10228 : RelationGetRelationName(pkrel))));
10229 :
10230 : /*
10231 : * References from permanent or unlogged tables to temp tables, and from
10232 : * permanent tables to unlogged tables, are disallowed because the
10233 : * referenced data can vanish out from under us. References from temp
10234 : * tables to any other table type are also disallowed, because other
10235 : * backends might need to run the RI triggers on the perm table, but they
10236 : * can't reliably see tuples in the local buffers of other backends.
10237 : */
10238 1825 : switch (rel->rd_rel->relpersistence)
10239 : {
10240 1632 : case RELPERSISTENCE_PERMANENT:
10241 1632 : if (!RelationIsPermanent(pkrel))
10242 0 : ereport(ERROR,
10243 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10244 : errmsg("constraints on permanent tables may reference only permanent tables")));
10245 1632 : break;
10246 8 : case RELPERSISTENCE_UNLOGGED:
10247 8 : if (!RelationIsPermanent(pkrel)
10248 8 : && pkrel->rd_rel->relpersistence != RELPERSISTENCE_UNLOGGED)
10249 0 : ereport(ERROR,
10250 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10251 : errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
10252 8 : break;
10253 185 : case RELPERSISTENCE_TEMP:
10254 185 : if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
10255 0 : ereport(ERROR,
10256 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10257 : errmsg("constraints on temporary tables may reference only temporary tables")));
10258 185 : if (!pkrel->rd_islocaltemp || !rel->rd_islocaltemp)
10259 0 : ereport(ERROR,
10260 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10261 : errmsg("constraints on temporary tables must involve temporary tables of this session")));
10262 185 : break;
10263 : }
10264 :
10265 : /*
10266 : * Look up the referencing attributes to make sure they exist, and record
10267 : * their attnums and type and collation OIDs.
10268 : */
10269 1825 : numfks = transformColumnNameList(RelationGetRelid(rel),
10270 : fkconstraint->fk_attrs,
10271 : fkattnum, fktypoid, fkcolloid);
10272 1805 : with_period = fkconstraint->fk_with_period || fkconstraint->pk_with_period;
10273 1805 : if (with_period && !fkconstraint->fk_with_period)
10274 16 : ereport(ERROR,
10275 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10276 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10277 :
10278 1789 : numfkdelsetcols = transformColumnNameList(RelationGetRelid(rel),
10279 : fkconstraint->fk_del_set_cols,
10280 : fkdelsetcols, NULL, NULL);
10281 1785 : numfkdelsetcols = validateFkOnDeleteSetColumns(numfks, fkattnum,
10282 : numfkdelsetcols,
10283 : fkdelsetcols,
10284 : fkconstraint->fk_del_set_cols);
10285 :
10286 : /*
10287 : * If the attribute list for the referenced table was omitted, lookup the
10288 : * definition of the primary key and use it. Otherwise, validate the
10289 : * supplied attribute list. In either case, discover the index OID and
10290 : * index opclasses, and the attnums and type and collation OIDs of the
10291 : * attributes.
10292 : */
10293 1781 : if (fkconstraint->pk_attrs == NIL)
10294 : {
10295 896 : numpks = transformFkeyGetPrimaryKey(pkrel, &indexOid,
10296 : &fkconstraint->pk_attrs,
10297 : pkattnum, pktypoid, pkcolloid,
10298 : opclasses, &pk_has_without_overlaps);
10299 :
10300 : /* If the primary key uses WITHOUT OVERLAPS, the fk must use PERIOD */
10301 896 : if (pk_has_without_overlaps && !fkconstraint->fk_with_period)
10302 16 : ereport(ERROR,
10303 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10304 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10305 : }
10306 : else
10307 : {
10308 885 : numpks = transformColumnNameList(RelationGetRelid(pkrel),
10309 : fkconstraint->pk_attrs,
10310 : pkattnum, pktypoid, pkcolloid);
10311 :
10312 : /* Since we got pk_attrs, one should be a period. */
10313 865 : if (with_period && !fkconstraint->pk_with_period)
10314 16 : ereport(ERROR,
10315 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10316 : errmsg("foreign key uses PERIOD on the referencing table but not the referenced table"));
10317 :
10318 : /* Look for an index matching the column list */
10319 849 : indexOid = transformFkeyCheckAttrs(pkrel, numpks, pkattnum,
10320 : with_period, opclasses, &pk_has_without_overlaps);
10321 : }
10322 :
10323 : /*
10324 : * If the referenced primary key has WITHOUT OVERLAPS, the foreign key
10325 : * must use PERIOD.
10326 : */
10327 1705 : if (pk_has_without_overlaps && !with_period)
10328 8 : ereport(ERROR,
10329 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10330 : errmsg("foreign key must use PERIOD when referencing a primary key using WITHOUT OVERLAPS"));
10331 :
10332 : /*
10333 : * Now we can check permissions.
10334 : */
10335 1697 : checkFkeyPermissions(pkrel, pkattnum, numpks);
10336 :
10337 : /*
10338 : * Check some things for generated columns.
10339 : */
10340 3975 : for (i = 0; i < numfks; i++)
10341 : {
10342 2298 : char attgenerated = TupleDescAttr(RelationGetDescr(rel), fkattnum[i] - 1)->attgenerated;
10343 :
10344 2298 : if (attgenerated)
10345 : {
10346 : /*
10347 : * Check restrictions on UPDATE/DELETE actions, per SQL standard
10348 : */
10349 32 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10350 32 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT ||
10351 32 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE)
10352 8 : ereport(ERROR,
10353 : (errcode(ERRCODE_SYNTAX_ERROR),
10354 : errmsg("invalid %s action for foreign key constraint containing generated column",
10355 : "ON UPDATE")));
10356 24 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10357 16 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10358 8 : ereport(ERROR,
10359 : (errcode(ERRCODE_SYNTAX_ERROR),
10360 : errmsg("invalid %s action for foreign key constraint containing generated column",
10361 : "ON DELETE")));
10362 : }
10363 :
10364 : /*
10365 : * FKs on virtual columns are not supported. This would require
10366 : * various additional support in ri_triggers.c, including special
10367 : * handling in ri_NullCheck(), ri_KeysEqual(),
10368 : * RI_FKey_fk_upd_check_required() (since all virtual columns appear
10369 : * as NULL there). Also not really practical as long as you can't
10370 : * index virtual columns.
10371 : */
10372 2282 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
10373 4 : ereport(ERROR,
10374 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10375 : errmsg("foreign key constraints on virtual generated columns are not supported")));
10376 : }
10377 :
10378 : /*
10379 : * Some actions are currently unsupported for foreign keys using PERIOD.
10380 : */
10381 1677 : if (fkconstraint->fk_with_period)
10382 : {
10383 178 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_RESTRICT ||
10384 170 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE ||
10385 158 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10386 146 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT)
10387 44 : ereport(ERROR,
10388 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10389 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10390 : "ON UPDATE"));
10391 :
10392 134 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_RESTRICT ||
10393 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_CASCADE ||
10394 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10395 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10396 4 : ereport(ERROR,
10397 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10398 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10399 : "ON DELETE"));
10400 : }
10401 :
10402 : /*
10403 : * Look up the equality operators to use in the constraint.
10404 : *
10405 : * Note that we have to be careful about the difference between the actual
10406 : * PK column type and the opclass' declared input type, which might be
10407 : * only binary-compatible with it. The declared opcintype is the right
10408 : * thing to probe pg_amop with.
10409 : */
10410 1629 : if (numfks != numpks)
10411 0 : ereport(ERROR,
10412 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
10413 : errmsg("number of referencing and referenced columns for foreign key disagree")));
10414 :
10415 : /*
10416 : * On the strength of a previous constraint, we might avoid scanning
10417 : * tables to validate this one. See below.
10418 : */
10419 1629 : old_check_ok = (fkconstraint->old_conpfeqop != NIL);
10420 : Assert(!old_check_ok || numfks == list_length(fkconstraint->old_conpfeqop));
10421 :
10422 3555 : for (i = 0; i < numpks; i++)
10423 : {
10424 2086 : Oid pktype = pktypoid[i];
10425 2086 : Oid fktype = fktypoid[i];
10426 : Oid fktyped;
10427 2086 : Oid pkcoll = pkcolloid[i];
10428 2086 : Oid fkcoll = fkcolloid[i];
10429 : HeapTuple cla_ht;
10430 : Form_pg_opclass cla_tup;
10431 : Oid amid;
10432 : Oid opfamily;
10433 : Oid opcintype;
10434 : bool for_overlaps;
10435 : CompareType cmptype;
10436 : Oid pfeqop;
10437 : Oid ppeqop;
10438 : Oid ffeqop;
10439 : int16 eqstrategy;
10440 : Oid pfeqop_right;
10441 :
10442 : /* We need several fields out of the pg_opclass entry */
10443 2086 : cla_ht = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclasses[i]));
10444 2086 : if (!HeapTupleIsValid(cla_ht))
10445 0 : elog(ERROR, "cache lookup failed for opclass %u", opclasses[i]);
10446 2086 : cla_tup = (Form_pg_opclass) GETSTRUCT(cla_ht);
10447 2086 : amid = cla_tup->opcmethod;
10448 2086 : opfamily = cla_tup->opcfamily;
10449 2086 : opcintype = cla_tup->opcintype;
10450 2086 : ReleaseSysCache(cla_ht);
10451 :
10452 : /*
10453 : * Get strategy number from index AM.
10454 : *
10455 : * For a normal foreign-key constraint, this should not fail, since we
10456 : * already checked that the index is unique and should therefore have
10457 : * appropriate equal operators. For a period foreign key, this could
10458 : * fail if we selected a non-matching exclusion constraint earlier.
10459 : * (XXX Maybe we should do these lookups earlier so we don't end up
10460 : * doing that.)
10461 : */
10462 2086 : for_overlaps = with_period && i == numpks - 1;
10463 2086 : cmptype = for_overlaps ? COMPARE_OVERLAP : COMPARE_EQ;
10464 2086 : eqstrategy = IndexAmTranslateCompareType(cmptype, amid, opfamily, true);
10465 2086 : if (eqstrategy == InvalidStrategy)
10466 0 : ereport(ERROR,
10467 : errcode(ERRCODE_UNDEFINED_OBJECT),
10468 : for_overlaps
10469 : ? errmsg("could not identify an overlaps operator for foreign key")
10470 : : errmsg("could not identify an equality operator for foreign key"),
10471 : errdetail("Could not translate compare type %d for operator family \"%s\" of access method \"%s\".",
10472 : cmptype, get_opfamily_name(opfamily, false), get_am_name(amid)));
10473 :
10474 : /*
10475 : * There had better be a primary equality operator for the index.
10476 : * We'll use it for PK = PK comparisons.
10477 : */
10478 2086 : ppeqop = get_opfamily_member(opfamily, opcintype, opcintype,
10479 : eqstrategy);
10480 :
10481 2086 : if (!OidIsValid(ppeqop))
10482 0 : elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
10483 : eqstrategy, opcintype, opcintype, opfamily);
10484 :
10485 : /*
10486 : * Are there equality operators that take exactly the FK type? Assume
10487 : * we should look through any domain here.
10488 : */
10489 2086 : fktyped = getBaseType(fktype);
10490 :
10491 2086 : pfeqop = get_opfamily_member(opfamily, opcintype, fktyped,
10492 : eqstrategy);
10493 2086 : if (OidIsValid(pfeqop))
10494 : {
10495 1637 : pfeqop_right = fktyped;
10496 1637 : ffeqop = get_opfamily_member(opfamily, fktyped, fktyped,
10497 : eqstrategy);
10498 : }
10499 : else
10500 : {
10501 : /* keep compiler quiet */
10502 449 : pfeqop_right = InvalidOid;
10503 449 : ffeqop = InvalidOid;
10504 : }
10505 :
10506 2086 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10507 : {
10508 : /*
10509 : * Otherwise, look for an implicit cast from the FK type to the
10510 : * opcintype, and if found, use the primary equality operator.
10511 : * This is a bit tricky because opcintype might be a polymorphic
10512 : * type such as ANYARRAY or ANYENUM; so what we have to test is
10513 : * whether the two actual column types can be concurrently cast to
10514 : * that type. (Otherwise, we'd fail to reject combinations such
10515 : * as int[] and point[].)
10516 : */
10517 : Oid input_typeids[2];
10518 : Oid target_typeids[2];
10519 :
10520 449 : input_typeids[0] = pktype;
10521 449 : input_typeids[1] = fktype;
10522 449 : target_typeids[0] = opcintype;
10523 449 : target_typeids[1] = opcintype;
10524 449 : if (can_coerce_type(2, input_typeids, target_typeids,
10525 : COERCION_IMPLICIT))
10526 : {
10527 297 : pfeqop = ffeqop = ppeqop;
10528 297 : pfeqop_right = opcintype;
10529 : }
10530 : }
10531 :
10532 2086 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10533 152 : ereport(ERROR,
10534 : (errcode(ERRCODE_DATATYPE_MISMATCH),
10535 : errmsg("foreign key constraint \"%s\" cannot be implemented",
10536 : fkconstraint->conname),
10537 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10538 : "are of incompatible types: %s and %s.",
10539 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10540 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10541 : format_type_be(fktype),
10542 : format_type_be(pktype))));
10543 :
10544 : /*
10545 : * This shouldn't be possible, but better check to make sure we have a
10546 : * consistent state for the check below.
10547 : */
10548 1934 : if ((OidIsValid(pkcoll) && !OidIsValid(fkcoll)) || (!OidIsValid(pkcoll) && OidIsValid(fkcoll)))
10549 0 : elog(ERROR, "key columns are not both collatable");
10550 :
10551 1934 : if (OidIsValid(pkcoll) && OidIsValid(fkcoll))
10552 : {
10553 : bool pkcolldet;
10554 : bool fkcolldet;
10555 :
10556 73 : pkcolldet = get_collation_isdeterministic(pkcoll);
10557 73 : fkcolldet = get_collation_isdeterministic(fkcoll);
10558 :
10559 : /*
10560 : * SQL requires that both collations are the same. This is
10561 : * because we need a consistent notion of equality on both
10562 : * columns. We relax this by allowing different collations if
10563 : * they are both deterministic. (This is also for backward
10564 : * compatibility, because PostgreSQL has always allowed this.)
10565 : */
10566 73 : if ((!pkcolldet || !fkcolldet) && pkcoll != fkcoll)
10567 8 : ereport(ERROR,
10568 : (errcode(ERRCODE_COLLATION_MISMATCH),
10569 : errmsg("foreign key constraint \"%s\" cannot be implemented", fkconstraint->conname),
10570 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10571 : "have incompatible collations: \"%s\" and \"%s\". "
10572 : "If either collation is nondeterministic, then both collations have to be the same.",
10573 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10574 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10575 : get_collation_name(fkcoll),
10576 : get_collation_name(pkcoll))));
10577 : }
10578 :
10579 1926 : if (old_check_ok)
10580 : {
10581 : /*
10582 : * When a pfeqop changes, revalidate the constraint. We could
10583 : * permit intra-opfamily changes, but that adds subtle complexity
10584 : * without any concrete benefit for core types. We need not
10585 : * assess ppeqop or ffeqop, which RI_Initial_Check() does not use.
10586 : */
10587 4 : old_check_ok = (pfeqop == lfirst_oid(old_pfeqop_item));
10588 4 : old_pfeqop_item = lnext(fkconstraint->old_conpfeqop,
10589 : old_pfeqop_item);
10590 : }
10591 1926 : if (old_check_ok)
10592 : {
10593 : Oid old_fktype;
10594 : Oid new_fktype;
10595 : CoercionPathType old_pathtype;
10596 : CoercionPathType new_pathtype;
10597 : Oid old_castfunc;
10598 : Oid new_castfunc;
10599 : Oid old_fkcoll;
10600 : Oid new_fkcoll;
10601 4 : Form_pg_attribute attr = TupleDescAttr(tab->oldDesc,
10602 4 : fkattnum[i] - 1);
10603 :
10604 : /*
10605 : * Identify coercion pathways from each of the old and new FK-side
10606 : * column types to the right (foreign) operand type of the pfeqop.
10607 : * We may assume that pg_constraint.conkey is not changing.
10608 : */
10609 4 : old_fktype = attr->atttypid;
10610 4 : new_fktype = fktype;
10611 4 : old_pathtype = findFkeyCast(pfeqop_right, old_fktype,
10612 : &old_castfunc);
10613 4 : new_pathtype = findFkeyCast(pfeqop_right, new_fktype,
10614 : &new_castfunc);
10615 :
10616 4 : old_fkcoll = attr->attcollation;
10617 4 : new_fkcoll = fkcoll;
10618 :
10619 : /*
10620 : * Upon a change to the cast from the FK column to its pfeqop
10621 : * operand, revalidate the constraint. For this evaluation, a
10622 : * binary coercion cast is equivalent to no cast at all. While
10623 : * type implementors should design implicit casts with an eye
10624 : * toward consistency of operations like equality, we cannot
10625 : * assume here that they have done so.
10626 : *
10627 : * A function with a polymorphic argument could change behavior
10628 : * arbitrarily in response to get_fn_expr_argtype(). Therefore,
10629 : * when the cast destination is polymorphic, we only avoid
10630 : * revalidation if the input type has not changed at all. Given
10631 : * just the core data types and operator classes, this requirement
10632 : * prevents no would-be optimizations.
10633 : *
10634 : * If the cast converts from a base type to a domain thereon, then
10635 : * that domain type must be the opcintype of the unique index.
10636 : * Necessarily, the primary key column must then be of the domain
10637 : * type. Since the constraint was previously valid, all values on
10638 : * the foreign side necessarily exist on the primary side and in
10639 : * turn conform to the domain. Consequently, we need not treat
10640 : * domains specially here.
10641 : *
10642 : * If the collation changes, revalidation is required, unless both
10643 : * collations are deterministic, because those share the same
10644 : * notion of equality (because texteq reduces to bitwise
10645 : * equality).
10646 : *
10647 : * We need not directly consider the PK type. It's necessarily
10648 : * binary coercible to the opcintype of the unique index column,
10649 : * and ri_triggers.c will only deal with PK datums in terms of
10650 : * that opcintype. Changing the opcintype also changes pfeqop.
10651 : */
10652 4 : old_check_ok = (new_pathtype == old_pathtype &&
10653 4 : new_castfunc == old_castfunc &&
10654 4 : (!IsPolymorphicType(pfeqop_right) ||
10655 8 : new_fktype == old_fktype) &&
10656 0 : (new_fkcoll == old_fkcoll ||
10657 0 : (get_collation_isdeterministic(old_fkcoll) && get_collation_isdeterministic(new_fkcoll))));
10658 : }
10659 :
10660 1926 : pfeqoperators[i] = pfeqop;
10661 1926 : ppeqoperators[i] = ppeqop;
10662 1926 : ffeqoperators[i] = ffeqop;
10663 : }
10664 :
10665 : /*
10666 : * For FKs with PERIOD we need additional operators to check whether the
10667 : * referencing row's range is contained by the aggregated ranges of the
10668 : * referenced row(s). For rangetypes and multirangetypes this is
10669 : * fk.periodatt <@ range_agg(pk.periodatt). Those are the only types we
10670 : * support for now. FKs will look these up at "runtime", but we should
10671 : * make sure the lookup works here, even if we don't use the values.
10672 : */
10673 1469 : if (with_period)
10674 : {
10675 : Oid periodoperoid;
10676 : Oid aggedperiodoperoid;
10677 : Oid intersectoperoid;
10678 :
10679 118 : FindFKPeriodOpers(opclasses[numpks - 1], &periodoperoid, &aggedperiodoperoid,
10680 : &intersectoperoid);
10681 : }
10682 :
10683 : /* First, create the constraint catalog entry itself. */
10684 1469 : address = addFkConstraint(addFkBothSides,
10685 : fkconstraint->conname, fkconstraint, rel, pkrel,
10686 : indexOid,
10687 : InvalidOid, /* no parent constraint */
10688 : numfks,
10689 : pkattnum,
10690 : fkattnum,
10691 : pfeqoperators,
10692 : ppeqoperators,
10693 : ffeqoperators,
10694 : numfkdelsetcols,
10695 : fkdelsetcols,
10696 : false,
10697 : with_period);
10698 :
10699 : /* Next process the action triggers at the referenced side and recurse */
10700 1469 : addFkRecurseReferenced(fkconstraint, rel, pkrel,
10701 : indexOid,
10702 : address.objectId,
10703 : numfks,
10704 : pkattnum,
10705 : fkattnum,
10706 : pfeqoperators,
10707 : ppeqoperators,
10708 : ffeqoperators,
10709 : numfkdelsetcols,
10710 : fkdelsetcols,
10711 : old_check_ok,
10712 : InvalidOid, InvalidOid,
10713 : with_period);
10714 :
10715 : /* Lastly create the check triggers at the referencing side and recurse */
10716 1469 : addFkRecurseReferencing(wqueue, fkconstraint, rel, pkrel,
10717 : indexOid,
10718 : address.objectId,
10719 : numfks,
10720 : pkattnum,
10721 : fkattnum,
10722 : pfeqoperators,
10723 : ppeqoperators,
10724 : ffeqoperators,
10725 : numfkdelsetcols,
10726 : fkdelsetcols,
10727 : old_check_ok,
10728 : lockmode,
10729 : InvalidOid, InvalidOid,
10730 : with_period);
10731 :
10732 : /*
10733 : * Done. Close pk table, but keep lock until we've committed.
10734 : */
10735 1469 : table_close(pkrel, NoLock);
10736 :
10737 1469 : return address;
10738 : }
10739 :
10740 : /*
10741 : * validateFkOnDeleteSetColumns
10742 : * Verifies that columns used in ON DELETE SET NULL/DEFAULT (...)
10743 : * column lists are valid.
10744 : *
10745 : * If there are duplicates in the fksetcolsattnums[] array, this silently
10746 : * removes the dups. The new count of numfksetcols is returned.
10747 : */
10748 : static int
10749 1785 : validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
10750 : int numfksetcols, int16 *fksetcolsattnums,
10751 : List *fksetcols)
10752 : {
10753 1785 : int numcolsout = 0;
10754 :
10755 1805 : for (int i = 0; i < numfksetcols; i++)
10756 : {
10757 24 : int16 setcol_attnum = fksetcolsattnums[i];
10758 24 : bool seen = false;
10759 :
10760 : /* Make sure it's in fkattnums[] */
10761 44 : for (int j = 0; j < numfks; j++)
10762 : {
10763 40 : if (fkattnums[j] == setcol_attnum)
10764 : {
10765 20 : seen = true;
10766 20 : break;
10767 : }
10768 : }
10769 :
10770 24 : if (!seen)
10771 : {
10772 4 : char *col = strVal(list_nth(fksetcols, i));
10773 :
10774 4 : ereport(ERROR,
10775 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
10776 : errmsg("column \"%s\" referenced in ON DELETE SET action must be part of foreign key", col)));
10777 : }
10778 :
10779 : /* Now check for dups */
10780 20 : seen = false;
10781 20 : for (int j = 0; j < numcolsout; j++)
10782 : {
10783 4 : if (fksetcolsattnums[j] == setcol_attnum)
10784 : {
10785 4 : seen = true;
10786 4 : break;
10787 : }
10788 : }
10789 20 : if (!seen)
10790 16 : fksetcolsattnums[numcolsout++] = setcol_attnum;
10791 : }
10792 1781 : return numcolsout;
10793 : }
10794 :
10795 : /*
10796 : * addFkConstraint
10797 : * Install pg_constraint entries to implement a foreign key constraint.
10798 : * Caller must separately invoke addFkRecurseReferenced and
10799 : * addFkRecurseReferencing, as appropriate, to install pg_trigger entries
10800 : * and (for partitioned tables) recurse to partitions.
10801 : *
10802 : * fkside: the side of the FK (or both) to create. Caller should
10803 : * call addFkRecurseReferenced if this is addFkReferencedSide,
10804 : * addFkRecurseReferencing if it's addFkReferencingSide, or both if it's
10805 : * addFkBothSides.
10806 : * constraintname: the base name for the constraint being added,
10807 : * copied to fkconstraint->conname if the latter is not set
10808 : * fkconstraint: the constraint being added
10809 : * rel: the root referencing relation
10810 : * pkrel: the referenced relation; might be a partition, if recursing
10811 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10812 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10813 : * top-level constraint
10814 : * numfks: the number of columns in the foreign key
10815 : * pkattnum: the attnum array of referenced attributes
10816 : * fkattnum: the attnum array of referencing attributes
10817 : * pf/pp/ffeqoperators: OID array of operators between columns
10818 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10819 : * (...) clause
10820 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10821 : * NULL/DEFAULT clause
10822 : * with_period: true if this is a temporal FK
10823 : */
10824 : static ObjectAddress
10825 2836 : addFkConstraint(addFkConstraintSides fkside,
10826 : char *constraintname, Constraint *fkconstraint,
10827 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
10828 : int numfks, int16 *pkattnum,
10829 : int16 *fkattnum, Oid *pfeqoperators, Oid *ppeqoperators,
10830 : Oid *ffeqoperators, int numfkdelsetcols, int16 *fkdelsetcols,
10831 : bool is_internal, bool with_period)
10832 : {
10833 : ObjectAddress address;
10834 : Oid constrOid;
10835 : char *conname;
10836 : bool conislocal;
10837 : int16 coninhcount;
10838 : bool connoinherit;
10839 :
10840 : /*
10841 : * Verify relkind for each referenced partition. At the top level, this
10842 : * is redundant with a previous check, but we need it when recursing.
10843 : */
10844 2836 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10845 589 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10846 0 : ereport(ERROR,
10847 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10848 : errmsg("referenced relation \"%s\" is not a table",
10849 : RelationGetRelationName(pkrel))));
10850 :
10851 : /*
10852 : * Caller supplies us with a constraint name; however, it may be used in
10853 : * this partition, so come up with a different one in that case. Unless
10854 : * truncation to NAMEDATALEN dictates otherwise, the new name will be the
10855 : * supplied name with an underscore and digit(s) appended.
10856 : */
10857 2836 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
10858 : RelationGetRelid(rel),
10859 : constraintname))
10860 811 : conname = ChooseConstraintName(constraintname,
10861 : NULL,
10862 : "",
10863 811 : RelationGetNamespace(rel), NIL);
10864 : else
10865 2025 : conname = constraintname;
10866 :
10867 2836 : if (fkconstraint->conname == NULL)
10868 283 : fkconstraint->conname = pstrdup(conname);
10869 :
10870 2836 : if (OidIsValid(parentConstr))
10871 : {
10872 1367 : conislocal = false;
10873 1367 : coninhcount = 1;
10874 1367 : connoinherit = false;
10875 : }
10876 : else
10877 : {
10878 1469 : conislocal = true;
10879 1469 : coninhcount = 0;
10880 :
10881 : /*
10882 : * always inherit for partitioned tables, never for legacy inheritance
10883 : */
10884 1469 : connoinherit = rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE;
10885 : }
10886 :
10887 : /*
10888 : * Record the FK constraint in pg_constraint.
10889 : */
10890 2836 : constrOid = CreateConstraintEntry(conname,
10891 2836 : RelationGetNamespace(rel),
10892 : CONSTRAINT_FOREIGN,
10893 2836 : fkconstraint->deferrable,
10894 2836 : fkconstraint->initdeferred,
10895 2836 : fkconstraint->is_enforced,
10896 2836 : fkconstraint->initially_valid,
10897 : parentConstr,
10898 : RelationGetRelid(rel),
10899 : fkattnum,
10900 : numfks,
10901 : numfks,
10902 : InvalidOid, /* not a domain constraint */
10903 : indexOid,
10904 : RelationGetRelid(pkrel),
10905 : pkattnum,
10906 : pfeqoperators,
10907 : ppeqoperators,
10908 : ffeqoperators,
10909 : numfks,
10910 2836 : fkconstraint->fk_upd_action,
10911 2836 : fkconstraint->fk_del_action,
10912 : fkdelsetcols,
10913 : numfkdelsetcols,
10914 2836 : fkconstraint->fk_matchtype,
10915 : NULL, /* no exclusion constraint */
10916 : NULL, /* no check constraint */
10917 : NULL,
10918 : conislocal, /* islocal */
10919 : coninhcount, /* inhcount */
10920 : connoinherit, /* conNoInherit */
10921 : with_period, /* conPeriod */
10922 : is_internal); /* is_internal */
10923 :
10924 2836 : ObjectAddressSet(address, ConstraintRelationId, constrOid);
10925 :
10926 : /*
10927 : * In partitioning cases, create the dependency entries for this
10928 : * constraint. (For non-partitioned cases, relevant entries were created
10929 : * by CreateConstraintEntry.)
10930 : *
10931 : * On the referenced side, we need the constraint to have an internal
10932 : * dependency on its parent constraint; this means that this constraint
10933 : * cannot be dropped on its own -- only through the parent constraint. It
10934 : * also means the containing partition cannot be dropped on its own, but
10935 : * it can be detached, at which point this dependency is removed (after
10936 : * verifying that no rows are referenced via this FK.)
10937 : *
10938 : * When processing the referencing side, we link the constraint via the
10939 : * special partitioning dependencies: the parent constraint is the primary
10940 : * dependent, and the partition on which the foreign key exists is the
10941 : * secondary dependency. That way, this constraint is dropped if either
10942 : * of these objects is.
10943 : *
10944 : * Note that this is only necessary for the subsidiary pg_constraint rows
10945 : * in partitions; the topmost row doesn't need any of this.
10946 : */
10947 2836 : if (OidIsValid(parentConstr))
10948 : {
10949 : ObjectAddress referenced;
10950 :
10951 1367 : ObjectAddressSet(referenced, ConstraintRelationId, parentConstr);
10952 :
10953 : Assert(fkside != addFkBothSides);
10954 1367 : if (fkside == addFkReferencedSide)
10955 807 : recordDependencyOn(&address, &referenced, DEPENDENCY_INTERNAL);
10956 : else
10957 : {
10958 560 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_PRI);
10959 560 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
10960 560 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_SEC);
10961 : }
10962 : }
10963 :
10964 : /* make new constraint visible, in case we add more */
10965 2836 : CommandCounterIncrement();
10966 :
10967 2836 : return address;
10968 : }
10969 :
10970 : /*
10971 : * addFkRecurseReferenced
10972 : * Recursive helper for the referenced side of foreign key creation,
10973 : * which creates the action triggers and recurses
10974 : *
10975 : * If the referenced relation is a plain relation, create the necessary action
10976 : * triggers that implement the constraint. If the referenced relation is a
10977 : * partitioned table, then we create a pg_constraint row referencing the parent
10978 : * of the referencing side for it and recurse on this routine for each
10979 : * partition.
10980 : *
10981 : * fkconstraint: the constraint being added
10982 : * rel: the root referencing relation
10983 : * pkrel: the referenced relation; might be a partition, if recursing
10984 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10985 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10986 : * top-level constraint
10987 : * numfks: the number of columns in the foreign key
10988 : * pkattnum: the attnum array of referenced attributes
10989 : * fkattnum: the attnum array of referencing attributes
10990 : * numfkdelsetcols: the number of columns in the ON DELETE SET
10991 : * NULL/DEFAULT (...) clause
10992 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10993 : * NULL/DEFAULT clause
10994 : * pf/pp/ffeqoperators: OID array of operators between columns
10995 : * old_check_ok: true if this constraint replaces an existing one that
10996 : * was already validated (thus this one doesn't need validation)
10997 : * parentDelTrigger and parentUpdTrigger: when recursively called on a
10998 : * partition, the OIDs of the parent action triggers for DELETE and
10999 : * UPDATE respectively.
11000 : * with_period: true if this is a temporal FK
11001 : */
11002 : static void
11003 2348 : addFkRecurseReferenced(Constraint *fkconstraint, Relation rel,
11004 : Relation pkrel, Oid indexOid, Oid parentConstr,
11005 : int numfks,
11006 : int16 *pkattnum, int16 *fkattnum, Oid *pfeqoperators,
11007 : Oid *ppeqoperators, Oid *ffeqoperators,
11008 : int numfkdelsetcols, int16 *fkdelsetcols,
11009 : bool old_check_ok,
11010 : Oid parentDelTrigger, Oid parentUpdTrigger,
11011 : bool with_period)
11012 : {
11013 2348 : Oid deleteTriggerOid = InvalidOid,
11014 2348 : updateTriggerOid = InvalidOid;
11015 :
11016 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
11017 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
11018 :
11019 : /*
11020 : * Create action triggers to enforce the constraint, or skip them if the
11021 : * constraint is NOT ENFORCED.
11022 : */
11023 2348 : if (fkconstraint->is_enforced)
11024 2295 : createForeignKeyActionTriggers(RelationGetRelid(rel),
11025 : RelationGetRelid(pkrel),
11026 : fkconstraint,
11027 : parentConstr, indexOid,
11028 : parentDelTrigger, parentUpdTrigger,
11029 : &deleteTriggerOid, &updateTriggerOid);
11030 :
11031 : /*
11032 : * If the referenced table is partitioned, recurse on ourselves to handle
11033 : * each partition. We need one pg_constraint row created for each
11034 : * partition in addition to the pg_constraint row for the parent table.
11035 : */
11036 2348 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11037 : {
11038 373 : PartitionDesc pd = RelationGetPartitionDesc(pkrel, true);
11039 :
11040 1048 : for (int i = 0; i < pd->nparts; i++)
11041 : {
11042 : Relation partRel;
11043 : AttrMap *map;
11044 : AttrNumber *mapped_pkattnum;
11045 : Oid partIndexId;
11046 : ObjectAddress address;
11047 :
11048 : /* XXX would it be better to acquire these locks beforehand? */
11049 675 : partRel = table_open(pd->oids[i], ShareRowExclusiveLock);
11050 :
11051 : /*
11052 : * Map the attribute numbers in the referenced side of the FK
11053 : * definition to match the partition's column layout.
11054 : */
11055 675 : map = build_attrmap_by_name_if_req(RelationGetDescr(partRel),
11056 : RelationGetDescr(pkrel),
11057 : false);
11058 675 : if (map)
11059 : {
11060 89 : mapped_pkattnum = palloc_array(AttrNumber, numfks);
11061 186 : for (int j = 0; j < numfks; j++)
11062 97 : mapped_pkattnum[j] = map->attnums[pkattnum[j] - 1];
11063 : }
11064 : else
11065 586 : mapped_pkattnum = pkattnum;
11066 :
11067 : /* Determine the index to use at this level */
11068 675 : partIndexId = index_get_partition(partRel, indexOid);
11069 675 : if (!OidIsValid(partIndexId))
11070 0 : elog(ERROR, "index for %u not found in partition %s",
11071 : indexOid, RelationGetRelationName(partRel));
11072 :
11073 : /* Create entry at this level ... */
11074 675 : address = addFkConstraint(addFkReferencedSide,
11075 : fkconstraint->conname, fkconstraint, rel,
11076 : partRel, partIndexId, parentConstr,
11077 : numfks, mapped_pkattnum,
11078 : fkattnum, pfeqoperators, ppeqoperators,
11079 : ffeqoperators, numfkdelsetcols,
11080 : fkdelsetcols, true, with_period);
11081 : /* ... and recurse to our children */
11082 675 : addFkRecurseReferenced(fkconstraint, rel, partRel,
11083 : partIndexId, address.objectId, numfks,
11084 : mapped_pkattnum, fkattnum,
11085 : pfeqoperators, ppeqoperators, ffeqoperators,
11086 : numfkdelsetcols, fkdelsetcols,
11087 : old_check_ok,
11088 : deleteTriggerOid, updateTriggerOid,
11089 : with_period);
11090 :
11091 : /* Done -- clean up (but keep the lock) */
11092 675 : table_close(partRel, NoLock);
11093 675 : if (map)
11094 : {
11095 89 : pfree(mapped_pkattnum);
11096 89 : free_attrmap(map);
11097 : }
11098 : }
11099 : }
11100 2348 : }
11101 :
11102 : /*
11103 : * addFkRecurseReferencing
11104 : * Recursive helper for the referencing side of foreign key creation,
11105 : * which creates the check triggers and recurses
11106 : *
11107 : * If the referencing relation is a plain relation, create the necessary check
11108 : * triggers that implement the constraint, and set up for Phase 3 constraint
11109 : * verification. If the referencing relation is a partitioned table, then
11110 : * we create a pg_constraint row for it and recurse on this routine for each
11111 : * partition.
11112 : *
11113 : * We assume that the referenced relation is locked against concurrent
11114 : * deletions. If it's a partitioned relation, every partition must be so
11115 : * locked.
11116 : *
11117 : * wqueue: the ALTER TABLE work queue; NULL when not running as part
11118 : * of an ALTER TABLE sequence.
11119 : * fkconstraint: the constraint being added
11120 : * rel: the referencing relation; might be a partition, if recursing
11121 : * pkrel: the root referenced relation
11122 : * indexOid: the OID of the index (on pkrel) implementing this constraint
11123 : * parentConstr: the OID of the parent constraint (there is always one)
11124 : * numfks: the number of columns in the foreign key
11125 : * pkattnum: the attnum array of referenced attributes
11126 : * fkattnum: the attnum array of referencing attributes
11127 : * pf/pp/ffeqoperators: OID array of operators between columns
11128 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
11129 : * (...) clause
11130 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
11131 : * NULL/DEFAULT clause
11132 : * old_check_ok: true if this constraint replaces an existing one that
11133 : * was already validated (thus this one doesn't need validation)
11134 : * lockmode: the lockmode to acquire on partitions when recursing
11135 : * parentInsTrigger and parentUpdTrigger: when being recursively called on
11136 : * a partition, the OIDs of the parent check triggers for INSERT and
11137 : * UPDATE respectively.
11138 : * with_period: true if this is a temporal FK
11139 : */
11140 : static void
11141 2029 : addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint, Relation rel,
11142 : Relation pkrel, Oid indexOid, Oid parentConstr,
11143 : int numfks, int16 *pkattnum, int16 *fkattnum,
11144 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
11145 : int numfkdelsetcols, int16 *fkdelsetcols,
11146 : bool old_check_ok, LOCKMODE lockmode,
11147 : Oid parentInsTrigger, Oid parentUpdTrigger,
11148 : bool with_period)
11149 : {
11150 2029 : Oid insertTriggerOid = InvalidOid,
11151 2029 : updateTriggerOid = InvalidOid;
11152 :
11153 : Assert(OidIsValid(parentConstr));
11154 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
11155 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
11156 :
11157 2029 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11158 0 : ereport(ERROR,
11159 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11160 : errmsg("foreign key constraints are not supported on foreign tables")));
11161 :
11162 : /*
11163 : * Add check triggers if the constraint is ENFORCED, and if needed,
11164 : * schedule them to be checked in Phase 3.
11165 : *
11166 : * If the relation is partitioned, drill down to do it to its partitions.
11167 : */
11168 2029 : if (fkconstraint->is_enforced)
11169 1992 : createForeignKeyCheckTriggers(RelationGetRelid(rel),
11170 : RelationGetRelid(pkrel),
11171 : fkconstraint,
11172 : parentConstr,
11173 : indexOid,
11174 : parentInsTrigger, parentUpdTrigger,
11175 : &insertTriggerOid, &updateTriggerOid);
11176 :
11177 2029 : if (rel->rd_rel->relkind == RELKIND_RELATION)
11178 : {
11179 : /*
11180 : * Tell Phase 3 to check that the constraint is satisfied by existing
11181 : * rows. We can skip this during table creation, when constraint is
11182 : * specified as NOT ENFORCED, or when requested explicitly by
11183 : * specifying NOT VALID in an ADD FOREIGN KEY command, and when we're
11184 : * recreating a constraint following a SET DATA TYPE operation that
11185 : * did not impugn its validity.
11186 : */
11187 1706 : if (wqueue && !old_check_ok && !fkconstraint->skip_validation &&
11188 599 : fkconstraint->is_enforced)
11189 : {
11190 : NewConstraint *newcon;
11191 : AlteredTableInfo *tab;
11192 :
11193 599 : tab = ATGetQueueEntry(wqueue, rel);
11194 :
11195 599 : newcon = palloc0_object(NewConstraint);
11196 599 : newcon->name = get_constraint_name(parentConstr);
11197 599 : newcon->contype = CONSTR_FOREIGN;
11198 599 : newcon->refrelid = RelationGetRelid(pkrel);
11199 599 : newcon->refindid = indexOid;
11200 599 : newcon->conid = parentConstr;
11201 599 : newcon->conwithperiod = fkconstraint->fk_with_period;
11202 599 : newcon->qual = (Node *) fkconstraint;
11203 :
11204 599 : tab->constraints = lappend(tab->constraints, newcon);
11205 : }
11206 : }
11207 323 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11208 : {
11209 323 : PartitionDesc pd = RelationGetPartitionDesc(rel, true);
11210 : Relation trigrel;
11211 :
11212 : /*
11213 : * Triggers of the foreign keys will be manipulated a bunch of times
11214 : * in the loop below. To avoid repeatedly opening/closing the trigger
11215 : * catalog relation, we open it here and pass it to the subroutines
11216 : * called below.
11217 : */
11218 323 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11219 :
11220 : /*
11221 : * Recurse to take appropriate action on each partition; either we
11222 : * find an existing constraint to reparent to ours, or we create a new
11223 : * one.
11224 : */
11225 608 : for (int i = 0; i < pd->nparts; i++)
11226 : {
11227 289 : Relation partition = table_open(pd->oids[i], lockmode);
11228 : List *partFKs;
11229 : AttrMap *attmap;
11230 : AttrNumber mapped_fkattnum[INDEX_MAX_KEYS];
11231 : bool attached;
11232 : ObjectAddress address;
11233 :
11234 289 : CheckAlterTableIsSafe(partition);
11235 :
11236 285 : attmap = build_attrmap_by_name(RelationGetDescr(partition),
11237 : RelationGetDescr(rel),
11238 : false);
11239 714 : for (int j = 0; j < numfks; j++)
11240 429 : mapped_fkattnum[j] = attmap->attnums[fkattnum[j] - 1];
11241 :
11242 : /* Check whether an existing constraint can be repurposed */
11243 285 : partFKs = copyObject(RelationGetFKeyList(partition));
11244 285 : attached = false;
11245 581 : foreach_node(ForeignKeyCacheInfo, fk, partFKs)
11246 : {
11247 19 : if (tryAttachPartitionForeignKey(wqueue,
11248 : fk,
11249 : partition,
11250 : parentConstr,
11251 : numfks,
11252 : mapped_fkattnum,
11253 : pkattnum,
11254 : pfeqoperators,
11255 : insertTriggerOid,
11256 : updateTriggerOid,
11257 : trigrel))
11258 : {
11259 8 : attached = true;
11260 8 : break;
11261 : }
11262 : }
11263 285 : if (attached)
11264 : {
11265 8 : table_close(partition, NoLock);
11266 8 : continue;
11267 : }
11268 :
11269 : /*
11270 : * No luck finding a good constraint to reuse; create our own.
11271 : */
11272 277 : address = addFkConstraint(addFkReferencingSide,
11273 : fkconstraint->conname, fkconstraint,
11274 : partition, pkrel, indexOid, parentConstr,
11275 : numfks, pkattnum,
11276 : mapped_fkattnum, pfeqoperators,
11277 : ppeqoperators, ffeqoperators,
11278 : numfkdelsetcols, fkdelsetcols, true,
11279 : with_period);
11280 :
11281 : /* call ourselves to finalize the creation and we're done */
11282 277 : addFkRecurseReferencing(wqueue, fkconstraint, partition, pkrel,
11283 : indexOid,
11284 : address.objectId,
11285 : numfks,
11286 : pkattnum,
11287 : mapped_fkattnum,
11288 : pfeqoperators,
11289 : ppeqoperators,
11290 : ffeqoperators,
11291 : numfkdelsetcols,
11292 : fkdelsetcols,
11293 : old_check_ok,
11294 : lockmode,
11295 : insertTriggerOid,
11296 : updateTriggerOid,
11297 : with_period);
11298 :
11299 277 : table_close(partition, NoLock);
11300 : }
11301 :
11302 319 : table_close(trigrel, RowExclusiveLock);
11303 : }
11304 2025 : }
11305 :
11306 : /*
11307 : * CloneForeignKeyConstraints
11308 : * Clone foreign keys from a partitioned table to a newly acquired
11309 : * partition.
11310 : *
11311 : * partitionRel is a partition of parentRel, so we can be certain that it has
11312 : * the same columns with the same datatypes. The columns may be in different
11313 : * order, though.
11314 : *
11315 : * wqueue must be passed to set up phase 3 constraint checking, unless the
11316 : * referencing-side partition is known to be empty (such as in CREATE TABLE /
11317 : * PARTITION OF).
11318 : */
11319 : static void
11320 7990 : CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
11321 : Relation partitionRel)
11322 : {
11323 : /* This only works for declarative partitioning */
11324 : Assert(parentRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
11325 :
11326 : /*
11327 : * First, clone constraints where the parent is on the referencing side.
11328 : */
11329 7990 : CloneFkReferencing(wqueue, parentRel, partitionRel);
11330 :
11331 : /*
11332 : * Clone constraints for which the parent is on the referenced side.
11333 : */
11334 7978 : CloneFkReferenced(parentRel, partitionRel);
11335 7978 : }
11336 :
11337 : /*
11338 : * CloneFkReferenced
11339 : * Subroutine for CloneForeignKeyConstraints
11340 : *
11341 : * Find all the FKs that have the parent relation on the referenced side;
11342 : * clone those constraints to the given partition. This is to be called
11343 : * when the partition is being created or attached.
11344 : *
11345 : * This recurses to partitions, if the relation being attached is partitioned.
11346 : * Recursion is done by calling addFkRecurseReferenced.
11347 : */
11348 : static void
11349 7978 : CloneFkReferenced(Relation parentRel, Relation partitionRel)
11350 : {
11351 : Relation pg_constraint;
11352 : AttrMap *attmap;
11353 : ListCell *cell;
11354 : SysScanDesc scan;
11355 : ScanKeyData key[2];
11356 : HeapTuple tuple;
11357 7978 : List *clone = NIL;
11358 : Relation trigrel;
11359 :
11360 : /*
11361 : * Search for any constraints where this partition's parent is in the
11362 : * referenced side. However, we must not clone any constraint whose
11363 : * parent constraint is also going to be cloned, to avoid duplicates. So
11364 : * do it in two steps: first construct the list of constraints to clone,
11365 : * then go over that list cloning those whose parents are not in the list.
11366 : * (We must not rely on the parent being seen first, since the catalog
11367 : * scan could return children first.)
11368 : */
11369 7978 : pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11370 7978 : ScanKeyInit(&key[0],
11371 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
11372 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parentRel)));
11373 7978 : ScanKeyInit(&key[1],
11374 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
11375 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
11376 : /* This is a seqscan, as we don't have a usable index ... */
11377 7978 : scan = systable_beginscan(pg_constraint, InvalidOid, true,
11378 : NULL, 2, key);
11379 8258 : while ((tuple = systable_getnext(scan)) != NULL)
11380 : {
11381 280 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11382 :
11383 280 : clone = lappend_oid(clone, constrForm->oid);
11384 : }
11385 7978 : systable_endscan(scan);
11386 7978 : table_close(pg_constraint, RowShareLock);
11387 :
11388 : /*
11389 : * Triggers of the foreign keys will be manipulated a bunch of times in
11390 : * the loop below. To avoid repeatedly opening/closing the trigger
11391 : * catalog relation, we open it here and pass it to the subroutines called
11392 : * below.
11393 : */
11394 7978 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11395 :
11396 7978 : attmap = build_attrmap_by_name(RelationGetDescr(partitionRel),
11397 : RelationGetDescr(parentRel),
11398 : false);
11399 8258 : foreach(cell, clone)
11400 : {
11401 280 : Oid constrOid = lfirst_oid(cell);
11402 : Form_pg_constraint constrForm;
11403 : Relation fkRel;
11404 : Oid indexOid;
11405 : Oid partIndexId;
11406 : int numfks;
11407 : AttrNumber conkey[INDEX_MAX_KEYS];
11408 : AttrNumber mapped_confkey[INDEX_MAX_KEYS];
11409 : AttrNumber confkey[INDEX_MAX_KEYS];
11410 : Oid conpfeqop[INDEX_MAX_KEYS];
11411 : Oid conppeqop[INDEX_MAX_KEYS];
11412 : Oid conffeqop[INDEX_MAX_KEYS];
11413 : int numfkdelsetcols;
11414 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11415 : Constraint *fkconstraint;
11416 : ObjectAddress address;
11417 280 : Oid deleteTriggerOid = InvalidOid,
11418 280 : updateTriggerOid = InvalidOid;
11419 :
11420 280 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
11421 280 : if (!HeapTupleIsValid(tuple))
11422 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
11423 280 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11424 :
11425 : /*
11426 : * As explained above: don't try to clone a constraint for which we're
11427 : * going to clone the parent.
11428 : */
11429 280 : if (list_member_oid(clone, constrForm->conparentid))
11430 : {
11431 148 : ReleaseSysCache(tuple);
11432 148 : continue;
11433 : }
11434 :
11435 : /* We need the same lock level that CreateTrigger will acquire */
11436 132 : fkRel = table_open(constrForm->conrelid, ShareRowExclusiveLock);
11437 :
11438 132 : indexOid = constrForm->conindid;
11439 132 : DeconstructFkConstraintRow(tuple,
11440 : &numfks,
11441 : conkey,
11442 : confkey,
11443 : conpfeqop,
11444 : conppeqop,
11445 : conffeqop,
11446 : &numfkdelsetcols,
11447 : confdelsetcols);
11448 :
11449 292 : for (int i = 0; i < numfks; i++)
11450 160 : mapped_confkey[i] = attmap->attnums[confkey[i] - 1];
11451 :
11452 132 : fkconstraint = makeNode(Constraint);
11453 132 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11454 132 : fkconstraint->conname = NameStr(constrForm->conname);
11455 132 : fkconstraint->deferrable = constrForm->condeferrable;
11456 132 : fkconstraint->initdeferred = constrForm->condeferred;
11457 132 : fkconstraint->location = -1;
11458 132 : fkconstraint->pktable = NULL;
11459 : /* ->fk_attrs determined below */
11460 132 : fkconstraint->pk_attrs = NIL;
11461 132 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11462 132 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11463 132 : fkconstraint->fk_del_action = constrForm->confdeltype;
11464 132 : fkconstraint->fk_del_set_cols = NIL;
11465 132 : fkconstraint->old_conpfeqop = NIL;
11466 132 : fkconstraint->old_pktable_oid = InvalidOid;
11467 132 : fkconstraint->is_enforced = constrForm->conenforced;
11468 132 : fkconstraint->skip_validation = false;
11469 132 : fkconstraint->initially_valid = constrForm->convalidated;
11470 :
11471 : /* set up colnames that are used to generate the constraint name */
11472 292 : for (int i = 0; i < numfks; i++)
11473 : {
11474 : Form_pg_attribute att;
11475 :
11476 160 : att = TupleDescAttr(RelationGetDescr(fkRel),
11477 160 : conkey[i] - 1);
11478 160 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11479 160 : makeString(NameStr(att->attname)));
11480 : }
11481 :
11482 : /*
11483 : * Add the new foreign key constraint pointing to the new partition.
11484 : * Because this new partition appears in the referenced side of the
11485 : * constraint, we don't need to set up for Phase 3 check.
11486 : */
11487 132 : partIndexId = index_get_partition(partitionRel, indexOid);
11488 132 : if (!OidIsValid(partIndexId))
11489 0 : elog(ERROR, "index for %u not found in partition %s",
11490 : indexOid, RelationGetRelationName(partitionRel));
11491 :
11492 : /*
11493 : * Get the "action" triggers belonging to the constraint to pass as
11494 : * parent OIDs for similar triggers that will be created on the
11495 : * partition in addFkRecurseReferenced().
11496 : */
11497 132 : if (constrForm->conenforced)
11498 128 : GetForeignKeyActionTriggers(trigrel, constrOid,
11499 : constrForm->confrelid, constrForm->conrelid,
11500 : &deleteTriggerOid, &updateTriggerOid);
11501 :
11502 : /* Add this constraint ... */
11503 132 : address = addFkConstraint(addFkReferencedSide,
11504 : fkconstraint->conname, fkconstraint, fkRel,
11505 : partitionRel, partIndexId, constrOid,
11506 : numfks, mapped_confkey,
11507 : conkey, conpfeqop, conppeqop, conffeqop,
11508 : numfkdelsetcols, confdelsetcols, false,
11509 132 : constrForm->conperiod);
11510 : /* ... and recurse */
11511 132 : addFkRecurseReferenced(fkconstraint,
11512 : fkRel,
11513 : partitionRel,
11514 : partIndexId,
11515 : address.objectId,
11516 : numfks,
11517 : mapped_confkey,
11518 : conkey,
11519 : conpfeqop,
11520 : conppeqop,
11521 : conffeqop,
11522 : numfkdelsetcols,
11523 : confdelsetcols,
11524 : true,
11525 : deleteTriggerOid,
11526 : updateTriggerOid,
11527 132 : constrForm->conperiod);
11528 :
11529 132 : table_close(fkRel, NoLock);
11530 132 : ReleaseSysCache(tuple);
11531 : }
11532 :
11533 7978 : table_close(trigrel, RowExclusiveLock);
11534 7978 : }
11535 :
11536 : /*
11537 : * CloneFkReferencing
11538 : * Subroutine for CloneForeignKeyConstraints
11539 : *
11540 : * For each FK constraint of the parent relation in the given list, find an
11541 : * equivalent constraint in its partition relation that can be reparented;
11542 : * if one cannot be found, create a new constraint in the partition as its
11543 : * child.
11544 : *
11545 : * If wqueue is given, it is used to set up phase-3 verification for each
11546 : * cloned constraint; omit it if such verification is not needed
11547 : * (example: the partition is being created anew).
11548 : */
11549 : static void
11550 7990 : CloneFkReferencing(List **wqueue, Relation parentRel, Relation partRel)
11551 : {
11552 : AttrMap *attmap;
11553 : List *partFKs;
11554 7990 : List *clone = NIL;
11555 : ListCell *cell;
11556 : Relation trigrel;
11557 :
11558 : /* obtain a list of constraints that we need to clone */
11559 8849 : foreach(cell, RelationGetFKeyList(parentRel))
11560 : {
11561 863 : ForeignKeyCacheInfo *fk = lfirst(cell);
11562 :
11563 : /*
11564 : * Refuse to attach a table as partition that this partitioned table
11565 : * already has a foreign key to. This isn't useful schema, which is
11566 : * proven by the fact that there have been no user complaints that
11567 : * it's already impossible to achieve this in the opposite direction,
11568 : * i.e., creating a foreign key that references a partition. This
11569 : * restriction allows us to dodge some complexities around
11570 : * pg_constraint and pg_trigger row creations that would be needed
11571 : * during ATTACH/DETACH for this kind of relationship.
11572 : */
11573 863 : if (fk->confrelid == RelationGetRelid(partRel))
11574 4 : ereport(ERROR,
11575 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
11576 : errmsg("cannot attach table \"%s\" as a partition because it is referenced by foreign key \"%s\"",
11577 : RelationGetRelationName(partRel),
11578 : get_constraint_name(fk->conoid))));
11579 :
11580 859 : clone = lappend_oid(clone, fk->conoid);
11581 : }
11582 :
11583 : /*
11584 : * Silently do nothing if there's nothing to do. In particular, this
11585 : * avoids throwing a spurious error for foreign tables.
11586 : */
11587 7986 : if (clone == NIL)
11588 7631 : return;
11589 :
11590 355 : if (partRel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11591 0 : ereport(ERROR,
11592 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11593 : errmsg("foreign key constraints are not supported on foreign tables")));
11594 :
11595 : /*
11596 : * Triggers of the foreign keys will be manipulated a bunch of times in
11597 : * the loop below. To avoid repeatedly opening/closing the trigger
11598 : * catalog relation, we open it here and pass it to the subroutines called
11599 : * below.
11600 : */
11601 355 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11602 :
11603 : /*
11604 : * The constraint key may differ, if the columns in the partition are
11605 : * different. This map is used to convert them.
11606 : */
11607 355 : attmap = build_attrmap_by_name(RelationGetDescr(partRel),
11608 : RelationGetDescr(parentRel),
11609 : false);
11610 :
11611 355 : partFKs = copyObject(RelationGetFKeyList(partRel));
11612 :
11613 1206 : foreach(cell, clone)
11614 : {
11615 859 : Oid parentConstrOid = lfirst_oid(cell);
11616 : Form_pg_constraint constrForm;
11617 : Relation pkrel;
11618 : HeapTuple tuple;
11619 : int numfks;
11620 : AttrNumber conkey[INDEX_MAX_KEYS];
11621 : AttrNumber mapped_conkey[INDEX_MAX_KEYS];
11622 : AttrNumber confkey[INDEX_MAX_KEYS];
11623 : Oid conpfeqop[INDEX_MAX_KEYS];
11624 : Oid conppeqop[INDEX_MAX_KEYS];
11625 : Oid conffeqop[INDEX_MAX_KEYS];
11626 : int numfkdelsetcols;
11627 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11628 : Constraint *fkconstraint;
11629 : bool attached;
11630 : Oid indexOid;
11631 : ObjectAddress address;
11632 : ListCell *lc;
11633 859 : Oid insertTriggerOid = InvalidOid,
11634 859 : updateTriggerOid = InvalidOid;
11635 : bool with_period;
11636 :
11637 859 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parentConstrOid));
11638 859 : if (!HeapTupleIsValid(tuple))
11639 0 : elog(ERROR, "cache lookup failed for constraint %u",
11640 : parentConstrOid);
11641 859 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11642 :
11643 : /* Don't clone constraints whose parents are being cloned */
11644 859 : if (list_member_oid(clone, constrForm->conparentid))
11645 : {
11646 472 : ReleaseSysCache(tuple);
11647 572 : continue;
11648 : }
11649 :
11650 : /*
11651 : * Need to prevent concurrent deletions. If pkrel is a partitioned
11652 : * relation, that means to lock all partitions.
11653 : */
11654 387 : pkrel = table_open(constrForm->confrelid, ShareRowExclusiveLock);
11655 387 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11656 164 : (void) find_all_inheritors(RelationGetRelid(pkrel),
11657 : ShareRowExclusiveLock, NULL);
11658 :
11659 387 : DeconstructFkConstraintRow(tuple, &numfks, conkey, confkey,
11660 : conpfeqop, conppeqop, conffeqop,
11661 : &numfkdelsetcols, confdelsetcols);
11662 930 : for (int i = 0; i < numfks; i++)
11663 543 : mapped_conkey[i] = attmap->attnums[conkey[i] - 1];
11664 :
11665 : /*
11666 : * Get the "check" triggers belonging to the constraint, if it is
11667 : * ENFORCED, to pass as parent OIDs for similar triggers that will be
11668 : * created on the partition in addFkRecurseReferencing(). They are
11669 : * also passed to tryAttachPartitionForeignKey() below to simply
11670 : * assign as parents to the partition's existing "check" triggers,
11671 : * that is, if the corresponding constraints is deemed attachable to
11672 : * the parent constraint.
11673 : */
11674 387 : if (constrForm->conenforced)
11675 379 : GetForeignKeyCheckTriggers(trigrel, constrForm->oid,
11676 : constrForm->confrelid, constrForm->conrelid,
11677 : &insertTriggerOid, &updateTriggerOid);
11678 :
11679 : /*
11680 : * Before creating a new constraint, see whether any existing FKs are
11681 : * fit for the purpose. If one is, attach the parent constraint to
11682 : * it, and don't clone anything. This way we avoid the expensive
11683 : * verification step and don't end up with a duplicate FK, and we
11684 : * don't need to recurse to partitions for this constraint.
11685 : */
11686 387 : attached = false;
11687 447 : foreach(lc, partFKs)
11688 : {
11689 164 : ForeignKeyCacheInfo *fk = lfirst_node(ForeignKeyCacheInfo, lc);
11690 :
11691 164 : if (tryAttachPartitionForeignKey(wqueue,
11692 : fk,
11693 : partRel,
11694 : parentConstrOid,
11695 : numfks,
11696 : mapped_conkey,
11697 : confkey,
11698 : conpfeqop,
11699 : insertTriggerOid,
11700 : updateTriggerOid,
11701 : trigrel))
11702 : {
11703 100 : attached = true;
11704 100 : table_close(pkrel, NoLock);
11705 100 : break;
11706 : }
11707 : }
11708 383 : if (attached)
11709 : {
11710 100 : ReleaseSysCache(tuple);
11711 100 : continue;
11712 : }
11713 :
11714 : /* No dice. Set up to create our own constraint */
11715 283 : fkconstraint = makeNode(Constraint);
11716 283 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11717 : /* ->conname determined below */
11718 283 : fkconstraint->deferrable = constrForm->condeferrable;
11719 283 : fkconstraint->initdeferred = constrForm->condeferred;
11720 283 : fkconstraint->location = -1;
11721 283 : fkconstraint->pktable = NULL;
11722 : /* ->fk_attrs determined below */
11723 283 : fkconstraint->pk_attrs = NIL;
11724 283 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11725 283 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11726 283 : fkconstraint->fk_del_action = constrForm->confdeltype;
11727 283 : fkconstraint->fk_del_set_cols = NIL;
11728 283 : fkconstraint->old_conpfeqop = NIL;
11729 283 : fkconstraint->old_pktable_oid = InvalidOid;
11730 283 : fkconstraint->is_enforced = constrForm->conenforced;
11731 283 : fkconstraint->skip_validation = false;
11732 283 : fkconstraint->initially_valid = constrForm->convalidated;
11733 646 : for (int i = 0; i < numfks; i++)
11734 : {
11735 : Form_pg_attribute att;
11736 :
11737 363 : att = TupleDescAttr(RelationGetDescr(partRel),
11738 363 : mapped_conkey[i] - 1);
11739 363 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11740 363 : makeString(NameStr(att->attname)));
11741 : }
11742 :
11743 283 : indexOid = constrForm->conindid;
11744 283 : with_period = constrForm->conperiod;
11745 :
11746 : /* Create the pg_constraint entry at this level */
11747 283 : address = addFkConstraint(addFkReferencingSide,
11748 283 : NameStr(constrForm->conname), fkconstraint,
11749 : partRel, pkrel, indexOid, parentConstrOid,
11750 : numfks, confkey,
11751 : mapped_conkey, conpfeqop,
11752 : conppeqop, conffeqop,
11753 : numfkdelsetcols, confdelsetcols,
11754 : false, with_period);
11755 :
11756 : /* Done with the cloned constraint's tuple */
11757 283 : ReleaseSysCache(tuple);
11758 :
11759 : /* Create the check triggers, and recurse to partitions, if any */
11760 283 : addFkRecurseReferencing(wqueue,
11761 : fkconstraint,
11762 : partRel,
11763 : pkrel,
11764 : indexOid,
11765 : address.objectId,
11766 : numfks,
11767 : confkey,
11768 : mapped_conkey,
11769 : conpfeqop,
11770 : conppeqop,
11771 : conffeqop,
11772 : numfkdelsetcols,
11773 : confdelsetcols,
11774 : false, /* no old check exists */
11775 : AccessExclusiveLock,
11776 : insertTriggerOid,
11777 : updateTriggerOid,
11778 : with_period);
11779 279 : table_close(pkrel, NoLock);
11780 : }
11781 :
11782 347 : table_close(trigrel, RowExclusiveLock);
11783 : }
11784 :
11785 : /*
11786 : * When the parent of a partition receives [the referencing side of] a foreign
11787 : * key, we must propagate that foreign key to the partition. However, the
11788 : * partition might already have an equivalent foreign key; this routine
11789 : * compares the given ForeignKeyCacheInfo (in the partition) to the FK defined
11790 : * by the other parameters. If they are equivalent, create the link between
11791 : * the two constraints and return true.
11792 : *
11793 : * If the given FK does not match the one defined by rest of the params,
11794 : * return false.
11795 : */
11796 : static bool
11797 183 : tryAttachPartitionForeignKey(List **wqueue,
11798 : ForeignKeyCacheInfo *fk,
11799 : Relation partition,
11800 : Oid parentConstrOid,
11801 : int numfks,
11802 : AttrNumber *mapped_conkey,
11803 : AttrNumber *confkey,
11804 : Oid *conpfeqop,
11805 : Oid parentInsTrigger,
11806 : Oid parentUpdTrigger,
11807 : Relation trigrel)
11808 : {
11809 : HeapTuple parentConstrTup;
11810 : Form_pg_constraint parentConstr;
11811 : HeapTuple partcontup;
11812 : Form_pg_constraint partConstr;
11813 :
11814 183 : parentConstrTup = SearchSysCache1(CONSTROID,
11815 : ObjectIdGetDatum(parentConstrOid));
11816 183 : if (!HeapTupleIsValid(parentConstrTup))
11817 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11818 183 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11819 :
11820 : /*
11821 : * Do some quick & easy initial checks. If any of these fail, we cannot
11822 : * use this constraint.
11823 : */
11824 183 : if (fk->confrelid != parentConstr->confrelid || fk->nkeys != numfks)
11825 : {
11826 0 : ReleaseSysCache(parentConstrTup);
11827 0 : return false;
11828 : }
11829 505 : for (int i = 0; i < numfks; i++)
11830 : {
11831 324 : if (fk->conkey[i] != mapped_conkey[i] ||
11832 322 : fk->confkey[i] != confkey[i] ||
11833 322 : fk->conpfeqop[i] != conpfeqop[i])
11834 : {
11835 2 : ReleaseSysCache(parentConstrTup);
11836 2 : return false;
11837 : }
11838 : }
11839 :
11840 : /* Looks good so far; perform more extensive checks. */
11841 181 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
11842 181 : if (!HeapTupleIsValid(partcontup))
11843 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
11844 181 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11845 :
11846 : /*
11847 : * An error should be raised if the constraint enforceability is
11848 : * different. Returning false without raising an error, as we do for other
11849 : * attributes, could lead to a duplicate constraint with the same
11850 : * enforceability as the parent. While this may be acceptable, it may not
11851 : * be ideal. Therefore, it's better to raise an error and allow the user
11852 : * to correct the enforceability before proceeding.
11853 : */
11854 181 : if (partConstr->conenforced != parentConstr->conenforced)
11855 4 : ereport(ERROR,
11856 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
11857 : errmsg("constraint \"%s\" enforceability conflicts with constraint \"%s\" on relation \"%s\"",
11858 : NameStr(parentConstr->conname),
11859 : NameStr(partConstr->conname),
11860 : RelationGetRelationName(partition))));
11861 :
11862 177 : if (OidIsValid(partConstr->conparentid) ||
11863 158 : partConstr->condeferrable != parentConstr->condeferrable ||
11864 140 : partConstr->condeferred != parentConstr->condeferred ||
11865 140 : partConstr->confupdtype != parentConstr->confupdtype ||
11866 117 : partConstr->confdeltype != parentConstr->confdeltype ||
11867 117 : partConstr->confmatchtype != parentConstr->confmatchtype)
11868 : {
11869 69 : ReleaseSysCache(parentConstrTup);
11870 69 : ReleaseSysCache(partcontup);
11871 69 : return false;
11872 : }
11873 :
11874 108 : ReleaseSysCache(parentConstrTup);
11875 108 : ReleaseSysCache(partcontup);
11876 :
11877 : /* Looks good! Attach this constraint. */
11878 108 : AttachPartitionForeignKey(wqueue, partition, fk->conoid,
11879 : parentConstrOid, parentInsTrigger,
11880 : parentUpdTrigger, trigrel);
11881 :
11882 108 : return true;
11883 : }
11884 :
11885 : /*
11886 : * AttachPartitionForeignKey
11887 : *
11888 : * The subroutine for tryAttachPartitionForeignKey performs the final tasks of
11889 : * attaching the constraint, removing redundant triggers and entries from
11890 : * pg_constraint, and setting the constraint's parent.
11891 : */
11892 : static void
11893 108 : AttachPartitionForeignKey(List **wqueue,
11894 : Relation partition,
11895 : Oid partConstrOid,
11896 : Oid parentConstrOid,
11897 : Oid parentInsTrigger,
11898 : Oid parentUpdTrigger,
11899 : Relation trigrel)
11900 : {
11901 : HeapTuple parentConstrTup;
11902 : Form_pg_constraint parentConstr;
11903 : HeapTuple partcontup;
11904 : Form_pg_constraint partConstr;
11905 : bool queueValidation;
11906 : Oid partConstrFrelid;
11907 : Oid partConstrRelid;
11908 : bool parentConstrIsEnforced;
11909 :
11910 : /* Fetch the parent constraint tuple */
11911 108 : parentConstrTup = SearchSysCache1(CONSTROID,
11912 : ObjectIdGetDatum(parentConstrOid));
11913 108 : if (!HeapTupleIsValid(parentConstrTup))
11914 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11915 108 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11916 108 : parentConstrIsEnforced = parentConstr->conenforced;
11917 :
11918 : /* Fetch the child constraint tuple */
11919 108 : partcontup = SearchSysCache1(CONSTROID,
11920 : ObjectIdGetDatum(partConstrOid));
11921 108 : if (!HeapTupleIsValid(partcontup))
11922 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11923 108 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11924 108 : partConstrFrelid = partConstr->confrelid;
11925 108 : partConstrRelid = partConstr->conrelid;
11926 :
11927 : /*
11928 : * If the referenced table is partitioned, then the partition we're
11929 : * attaching now has extra pg_constraint rows and action triggers that are
11930 : * no longer needed. Remove those.
11931 : */
11932 108 : if (get_rel_relkind(partConstrFrelid) == RELKIND_PARTITIONED_TABLE)
11933 : {
11934 24 : Relation pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11935 :
11936 24 : RemoveInheritedConstraint(pg_constraint, trigrel, partConstrOid,
11937 : partConstrRelid);
11938 :
11939 24 : table_close(pg_constraint, RowShareLock);
11940 : }
11941 :
11942 : /*
11943 : * Will we need to validate this constraint? A valid parent constraint
11944 : * implies that all child constraints have been validated, so if this one
11945 : * isn't, we must trigger phase 3 validation.
11946 : */
11947 108 : queueValidation = parentConstr->convalidated && !partConstr->convalidated;
11948 :
11949 108 : ReleaseSysCache(partcontup);
11950 108 : ReleaseSysCache(parentConstrTup);
11951 :
11952 : /*
11953 : * The action triggers in the new partition become redundant -- the parent
11954 : * table already has equivalent ones, and those will be able to reach the
11955 : * partition. Remove the ones in the partition. We identify them because
11956 : * they have our constraint OID, as well as being on the referenced rel.
11957 : */
11958 108 : DropForeignKeyConstraintTriggers(trigrel, partConstrOid, partConstrFrelid,
11959 : partConstrRelid);
11960 :
11961 108 : ConstraintSetParentConstraint(partConstrOid, parentConstrOid,
11962 : RelationGetRelid(partition));
11963 :
11964 : /*
11965 : * Like the constraint, attach partition's "check" triggers to the
11966 : * corresponding parent triggers if the constraint is ENFORCED. NOT
11967 : * ENFORCED constraints do not have these triggers.
11968 : */
11969 108 : if (parentConstrIsEnforced)
11970 : {
11971 : Oid insertTriggerOid,
11972 : updateTriggerOid;
11973 :
11974 100 : GetForeignKeyCheckTriggers(trigrel,
11975 : partConstrOid, partConstrFrelid, partConstrRelid,
11976 : &insertTriggerOid, &updateTriggerOid);
11977 : Assert(OidIsValid(insertTriggerOid) && OidIsValid(parentInsTrigger));
11978 100 : TriggerSetParentTrigger(trigrel, insertTriggerOid, parentInsTrigger,
11979 : RelationGetRelid(partition));
11980 : Assert(OidIsValid(updateTriggerOid) && OidIsValid(parentUpdTrigger));
11981 100 : TriggerSetParentTrigger(trigrel, updateTriggerOid, parentUpdTrigger,
11982 : RelationGetRelid(partition));
11983 : }
11984 :
11985 : /*
11986 : * We updated this pg_constraint row above to set its parent; validating
11987 : * it will cause its convalidated flag to change, so we need CCI here. In
11988 : * addition, we need it unconditionally for the rare case where the parent
11989 : * table has *two* identical constraints; when reaching this function for
11990 : * the second one, we must have made our changes visible, otherwise we
11991 : * would try to attach both to this one.
11992 : */
11993 108 : CommandCounterIncrement();
11994 :
11995 : /* If validation is needed, put it in the queue now. */
11996 108 : if (queueValidation)
11997 : {
11998 : Relation conrel;
11999 : Oid confrelid;
12000 :
12001 12 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12002 :
12003 12 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(partConstrOid));
12004 12 : if (!HeapTupleIsValid(partcontup))
12005 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
12006 :
12007 12 : confrelid = ((Form_pg_constraint) GETSTRUCT(partcontup))->confrelid;
12008 :
12009 : /* Use the same lock as for AT_ValidateConstraint */
12010 12 : QueueFKConstraintValidation(wqueue, conrel, partition, confrelid,
12011 : partcontup, ShareUpdateExclusiveLock);
12012 12 : ReleaseSysCache(partcontup);
12013 12 : table_close(conrel, RowExclusiveLock);
12014 : }
12015 108 : }
12016 :
12017 : /*
12018 : * RemoveInheritedConstraint
12019 : *
12020 : * Removes the constraint and its associated trigger from the specified
12021 : * relation, which inherited the given constraint.
12022 : */
12023 : static void
12024 24 : RemoveInheritedConstraint(Relation conrel, Relation trigrel, Oid conoid,
12025 : Oid conrelid)
12026 : {
12027 : ObjectAddresses *objs;
12028 : HeapTuple consttup;
12029 : ScanKeyData key;
12030 : SysScanDesc scan;
12031 : HeapTuple trigtup;
12032 :
12033 24 : ScanKeyInit(&key,
12034 : Anum_pg_constraint_conrelid,
12035 : BTEqualStrategyNumber, F_OIDEQ,
12036 : ObjectIdGetDatum(conrelid));
12037 :
12038 24 : scan = systable_beginscan(conrel,
12039 : ConstraintRelidTypidNameIndexId,
12040 : true, NULL, 1, &key);
12041 24 : objs = new_object_addresses();
12042 216 : while ((consttup = systable_getnext(scan)) != NULL)
12043 : {
12044 192 : Form_pg_constraint conform = (Form_pg_constraint) GETSTRUCT(consttup);
12045 :
12046 192 : if (conform->conparentid != conoid)
12047 140 : continue;
12048 : else
12049 : {
12050 : ObjectAddress addr;
12051 : SysScanDesc scan2;
12052 : ScanKeyData key2;
12053 : int n PG_USED_FOR_ASSERTS_ONLY;
12054 :
12055 52 : ObjectAddressSet(addr, ConstraintRelationId, conform->oid);
12056 52 : add_exact_object_address(&addr, objs);
12057 :
12058 : /*
12059 : * First we must delete the dependency record that binds the
12060 : * constraint records together.
12061 : */
12062 52 : n = deleteDependencyRecordsForSpecific(ConstraintRelationId,
12063 : conform->oid,
12064 : DEPENDENCY_INTERNAL,
12065 : ConstraintRelationId,
12066 : conoid);
12067 : Assert(n == 1); /* actually only one is expected */
12068 :
12069 : /*
12070 : * Now search for the triggers for this constraint and set them up
12071 : * for deletion too
12072 : */
12073 52 : ScanKeyInit(&key2,
12074 : Anum_pg_trigger_tgconstraint,
12075 : BTEqualStrategyNumber, F_OIDEQ,
12076 : ObjectIdGetDatum(conform->oid));
12077 52 : scan2 = systable_beginscan(trigrel, TriggerConstraintIndexId,
12078 : true, NULL, 1, &key2);
12079 156 : while ((trigtup = systable_getnext(scan2)) != NULL)
12080 : {
12081 104 : ObjectAddressSet(addr, TriggerRelationId,
12082 : ((Form_pg_trigger) GETSTRUCT(trigtup))->oid);
12083 104 : add_exact_object_address(&addr, objs);
12084 : }
12085 52 : systable_endscan(scan2);
12086 : }
12087 : }
12088 : /* make the dependency deletions visible */
12089 24 : CommandCounterIncrement();
12090 24 : performMultipleDeletions(objs, DROP_RESTRICT,
12091 : PERFORM_DELETION_INTERNAL);
12092 24 : systable_endscan(scan);
12093 24 : }
12094 :
12095 : /*
12096 : * DropForeignKeyConstraintTriggers
12097 : *
12098 : * The subroutine for tryAttachPartitionForeignKey handles the deletion of
12099 : * action triggers for the foreign key constraint.
12100 : *
12101 : * If valid confrelid and conrelid values are not provided, the respective
12102 : * trigger check will be skipped, and the trigger will be considered for
12103 : * removal.
12104 : */
12105 : static void
12106 160 : DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid, Oid confrelid,
12107 : Oid conrelid)
12108 : {
12109 : ScanKeyData key;
12110 : SysScanDesc scan;
12111 : HeapTuple trigtup;
12112 :
12113 160 : ScanKeyInit(&key,
12114 : Anum_pg_trigger_tgconstraint,
12115 : BTEqualStrategyNumber, F_OIDEQ,
12116 : ObjectIdGetDatum(conoid));
12117 160 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12118 : NULL, 1, &key);
12119 696 : while ((trigtup = systable_getnext(scan)) != NULL)
12120 : {
12121 536 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12122 : ObjectAddress trigger;
12123 :
12124 : /* Invalid if trigger is not for a referential integrity constraint */
12125 536 : if (!OidIsValid(trgform->tgconstrrelid))
12126 200 : continue;
12127 536 : if (OidIsValid(conrelid) && trgform->tgconstrrelid != conrelid)
12128 200 : continue;
12129 336 : if (OidIsValid(confrelid) && trgform->tgrelid != confrelid)
12130 0 : continue;
12131 :
12132 : /* We should be dropping trigger related to foreign key constraint */
12133 : Assert(trgform->tgfoid == F_RI_FKEY_CHECK_INS ||
12134 : trgform->tgfoid == F_RI_FKEY_CHECK_UPD ||
12135 : trgform->tgfoid == F_RI_FKEY_CASCADE_DEL ||
12136 : trgform->tgfoid == F_RI_FKEY_CASCADE_UPD ||
12137 : trgform->tgfoid == F_RI_FKEY_RESTRICT_DEL ||
12138 : trgform->tgfoid == F_RI_FKEY_RESTRICT_UPD ||
12139 : trgform->tgfoid == F_RI_FKEY_SETNULL_DEL ||
12140 : trgform->tgfoid == F_RI_FKEY_SETNULL_UPD ||
12141 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_DEL ||
12142 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_UPD ||
12143 : trgform->tgfoid == F_RI_FKEY_NOACTION_DEL ||
12144 : trgform->tgfoid == F_RI_FKEY_NOACTION_UPD);
12145 :
12146 : /*
12147 : * The constraint is originally set up to contain this trigger as an
12148 : * implementation object, so there's a dependency record that links
12149 : * the two; however, since the trigger is no longer needed, we remove
12150 : * the dependency link in order to be able to drop the trigger while
12151 : * keeping the constraint intact.
12152 : */
12153 336 : deleteDependencyRecordsFor(TriggerRelationId,
12154 : trgform->oid,
12155 : false);
12156 : /* make dependency deletion visible to performDeletion */
12157 336 : CommandCounterIncrement();
12158 336 : ObjectAddressSet(trigger, TriggerRelationId,
12159 : trgform->oid);
12160 336 : performDeletion(&trigger, DROP_RESTRICT, 0);
12161 : /* make trigger drop visible, in case the loop iterates */
12162 336 : CommandCounterIncrement();
12163 : }
12164 :
12165 160 : systable_endscan(scan);
12166 160 : }
12167 :
12168 : /*
12169 : * GetForeignKeyActionTriggers
12170 : * Returns delete and update "action" triggers of the given relation
12171 : * belonging to the given constraint
12172 : */
12173 : static void
12174 128 : GetForeignKeyActionTriggers(Relation trigrel,
12175 : Oid conoid, Oid confrelid, Oid conrelid,
12176 : Oid *deleteTriggerOid,
12177 : Oid *updateTriggerOid)
12178 : {
12179 : ScanKeyData key;
12180 : SysScanDesc scan;
12181 : HeapTuple trigtup;
12182 :
12183 128 : *deleteTriggerOid = *updateTriggerOid = InvalidOid;
12184 128 : ScanKeyInit(&key,
12185 : Anum_pg_trigger_tgconstraint,
12186 : BTEqualStrategyNumber, F_OIDEQ,
12187 : ObjectIdGetDatum(conoid));
12188 :
12189 128 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12190 : NULL, 1, &key);
12191 265 : while ((trigtup = systable_getnext(scan)) != NULL)
12192 : {
12193 265 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12194 :
12195 265 : if (trgform->tgconstrrelid != conrelid)
12196 9 : continue;
12197 256 : if (trgform->tgrelid != confrelid)
12198 0 : continue;
12199 : /* Only ever look at "action" triggers on the PK side. */
12200 256 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_PK)
12201 0 : continue;
12202 256 : if (TRIGGER_FOR_DELETE(trgform->tgtype))
12203 : {
12204 : Assert(*deleteTriggerOid == InvalidOid);
12205 128 : *deleteTriggerOid = trgform->oid;
12206 : }
12207 128 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12208 : {
12209 : Assert(*updateTriggerOid == InvalidOid);
12210 128 : *updateTriggerOid = trgform->oid;
12211 : }
12212 : #ifndef USE_ASSERT_CHECKING
12213 : /* In an assert-enabled build, continue looking to find duplicates */
12214 256 : if (OidIsValid(*deleteTriggerOid) && OidIsValid(*updateTriggerOid))
12215 128 : break;
12216 : #endif
12217 : }
12218 :
12219 128 : if (!OidIsValid(*deleteTriggerOid))
12220 0 : elog(ERROR, "could not find ON DELETE action trigger of foreign key constraint %u",
12221 : conoid);
12222 128 : if (!OidIsValid(*updateTriggerOid))
12223 0 : elog(ERROR, "could not find ON UPDATE action trigger of foreign key constraint %u",
12224 : conoid);
12225 :
12226 128 : systable_endscan(scan);
12227 128 : }
12228 :
12229 : /*
12230 : * GetForeignKeyCheckTriggers
12231 : * Returns insert and update "check" triggers of the given relation
12232 : * belonging to the given constraint
12233 : */
12234 : static void
12235 551 : GetForeignKeyCheckTriggers(Relation trigrel,
12236 : Oid conoid, Oid confrelid, Oid conrelid,
12237 : Oid *insertTriggerOid,
12238 : Oid *updateTriggerOid)
12239 : {
12240 : ScanKeyData key;
12241 : SysScanDesc scan;
12242 : HeapTuple trigtup;
12243 :
12244 551 : *insertTriggerOid = *updateTriggerOid = InvalidOid;
12245 551 : ScanKeyInit(&key,
12246 : Anum_pg_trigger_tgconstraint,
12247 : BTEqualStrategyNumber, F_OIDEQ,
12248 : ObjectIdGetDatum(conoid));
12249 :
12250 551 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12251 : NULL, 1, &key);
12252 1765 : while ((trigtup = systable_getnext(scan)) != NULL)
12253 : {
12254 1765 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12255 :
12256 1765 : if (trgform->tgconstrrelid != confrelid)
12257 591 : continue;
12258 1174 : if (trgform->tgrelid != conrelid)
12259 0 : continue;
12260 : /* Only ever look at "check" triggers on the FK side. */
12261 1174 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_FK)
12262 72 : continue;
12263 1102 : if (TRIGGER_FOR_INSERT(trgform->tgtype))
12264 : {
12265 : Assert(*insertTriggerOid == InvalidOid);
12266 551 : *insertTriggerOid = trgform->oid;
12267 : }
12268 551 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12269 : {
12270 : Assert(*updateTriggerOid == InvalidOid);
12271 551 : *updateTriggerOid = trgform->oid;
12272 : }
12273 : #ifndef USE_ASSERT_CHECKING
12274 : /* In an assert-enabled build, continue looking to find duplicates. */
12275 1102 : if (OidIsValid(*insertTriggerOid) && OidIsValid(*updateTriggerOid))
12276 551 : break;
12277 : #endif
12278 : }
12279 :
12280 551 : if (!OidIsValid(*insertTriggerOid))
12281 0 : elog(ERROR, "could not find ON INSERT check triggers of foreign key constraint %u",
12282 : conoid);
12283 551 : if (!OidIsValid(*updateTriggerOid))
12284 0 : elog(ERROR, "could not find ON UPDATE check triggers of foreign key constraint %u",
12285 : conoid);
12286 :
12287 551 : systable_endscan(scan);
12288 551 : }
12289 :
12290 : /*
12291 : * ALTER TABLE ALTER CONSTRAINT
12292 : *
12293 : * Update the attributes of a constraint.
12294 : *
12295 : * Currently works for Foreign Key, Check, and not null constraints.
12296 : *
12297 : * If the constraint is modified, returns its address; otherwise, return
12298 : * InvalidObjectAddress.
12299 : */
12300 : static ObjectAddress
12301 292 : ATExecAlterConstraint(List **wqueue, Relation rel, ATAlterConstraint *cmdcon,
12302 : bool recurse, LOCKMODE lockmode)
12303 : {
12304 : Relation conrel;
12305 : Relation tgrel;
12306 : SysScanDesc scan;
12307 : ScanKeyData skey[3];
12308 : HeapTuple contuple;
12309 : Form_pg_constraint currcon;
12310 : ObjectAddress address;
12311 :
12312 : /*
12313 : * Disallow altering ONLY a partitioned table, as it would make no sense.
12314 : * This is okay for legacy inheritance.
12315 : */
12316 292 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
12317 0 : ereport(ERROR,
12318 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12319 : errmsg("constraint must be altered in child tables too"),
12320 : errhint("Do not specify the ONLY keyword."));
12321 :
12322 :
12323 292 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12324 292 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
12325 :
12326 : /*
12327 : * Find and check the target constraint
12328 : */
12329 292 : ScanKeyInit(&skey[0],
12330 : Anum_pg_constraint_conrelid,
12331 : BTEqualStrategyNumber, F_OIDEQ,
12332 : ObjectIdGetDatum(RelationGetRelid(rel)));
12333 292 : ScanKeyInit(&skey[1],
12334 : Anum_pg_constraint_contypid,
12335 : BTEqualStrategyNumber, F_OIDEQ,
12336 : ObjectIdGetDatum(InvalidOid));
12337 292 : ScanKeyInit(&skey[2],
12338 : Anum_pg_constraint_conname,
12339 : BTEqualStrategyNumber, F_NAMEEQ,
12340 292 : CStringGetDatum(cmdcon->conname));
12341 292 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12342 : true, NULL, 3, skey);
12343 :
12344 : /* There can be at most one matching row */
12345 292 : if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
12346 4 : ereport(ERROR,
12347 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12348 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12349 : cmdcon->conname, RelationGetRelationName(rel))));
12350 :
12351 288 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12352 288 : if (cmdcon->alterDeferrability && currcon->contype != CONSTRAINT_FOREIGN)
12353 0 : ereport(ERROR,
12354 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12355 : errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key constraint",
12356 : cmdcon->conname, RelationGetRelationName(rel))));
12357 288 : if (cmdcon->alterEnforceability &&
12358 156 : (currcon->contype != CONSTRAINT_FOREIGN && currcon->contype != CONSTRAINT_CHECK))
12359 8 : ereport(ERROR,
12360 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12361 : errmsg("cannot alter enforceability of constraint \"%s\" of relation \"%s\"",
12362 : cmdcon->conname, RelationGetRelationName(rel)),
12363 : errhint("Only foreign key and check constraints can change enforceability.")));
12364 280 : if (cmdcon->alterInheritability &&
12365 60 : currcon->contype != CONSTRAINT_NOTNULL)
12366 16 : ereport(ERROR,
12367 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12368 : errmsg("constraint \"%s\" of relation \"%s\" is not a not-null constraint",
12369 : cmdcon->conname, RelationGetRelationName(rel)));
12370 :
12371 : /* Refuse to modify inheritability of inherited constraints */
12372 264 : if (cmdcon->alterInheritability &&
12373 44 : cmdcon->noinherit && currcon->coninhcount > 0)
12374 4 : ereport(ERROR,
12375 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12376 : errmsg("cannot alter inherited constraint \"%s\" on relation \"%s\"",
12377 : NameStr(currcon->conname),
12378 : RelationGetRelationName(rel)));
12379 :
12380 : /*
12381 : * If it's not the topmost constraint, raise an error.
12382 : *
12383 : * Altering a non-topmost constraint leaves some triggers untouched, since
12384 : * they are not directly connected to this constraint; also, pg_dump would
12385 : * ignore the deferrability status of the individual constraint, since it
12386 : * only dumps topmost constraints. Avoid these problems by refusing this
12387 : * operation and telling the user to alter the parent constraint instead.
12388 : */
12389 260 : if (OidIsValid(currcon->conparentid))
12390 : {
12391 : HeapTuple tp;
12392 8 : Oid parent = currcon->conparentid;
12393 8 : char *ancestorname = NULL;
12394 8 : char *ancestortable = NULL;
12395 :
12396 : /* Loop to find the topmost constraint */
12397 16 : while (HeapTupleIsValid(tp = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parent))))
12398 : {
12399 16 : Form_pg_constraint contup = (Form_pg_constraint) GETSTRUCT(tp);
12400 :
12401 : /* If no parent, this is the constraint we want */
12402 16 : if (!OidIsValid(contup->conparentid))
12403 : {
12404 8 : ancestorname = pstrdup(NameStr(contup->conname));
12405 8 : ancestortable = get_rel_name(contup->conrelid);
12406 8 : ReleaseSysCache(tp);
12407 8 : break;
12408 : }
12409 :
12410 8 : parent = contup->conparentid;
12411 8 : ReleaseSysCache(tp);
12412 : }
12413 :
12414 8 : ereport(ERROR,
12415 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12416 : errmsg("cannot alter constraint \"%s\" on relation \"%s\"",
12417 : cmdcon->conname, RelationGetRelationName(rel)),
12418 : ancestorname && ancestortable ?
12419 : errdetail("Constraint \"%s\" is derived from constraint \"%s\" of relation \"%s\".",
12420 : cmdcon->conname, ancestorname, ancestortable) : 0,
12421 : errhint("You may alter the constraint it derives from instead.")));
12422 : }
12423 :
12424 252 : address = InvalidObjectAddress;
12425 :
12426 : /*
12427 : * Do the actual catalog work, and recurse if necessary.
12428 : */
12429 252 : if (ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, rel,
12430 : contuple, recurse, lockmode))
12431 232 : ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
12432 :
12433 240 : systable_endscan(scan);
12434 :
12435 240 : table_close(tgrel, RowExclusiveLock);
12436 240 : table_close(conrel, RowExclusiveLock);
12437 :
12438 240 : return address;
12439 : }
12440 :
12441 : /*
12442 : * A subroutine of ATExecAlterConstraint that calls the respective routines for
12443 : * altering constraint's enforceability, deferrability or inheritability.
12444 : */
12445 : static bool
12446 252 : ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon,
12447 : Relation conrel, Relation tgrel, Relation rel,
12448 : HeapTuple contuple, bool recurse,
12449 : LOCKMODE lockmode)
12450 : {
12451 : Form_pg_constraint currcon;
12452 252 : bool changed = false;
12453 252 : List *otherrelids = NIL;
12454 :
12455 252 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12456 :
12457 : /*
12458 : * Do the catalog work for the enforceability or deferrability change,
12459 : * recurse if necessary.
12460 : *
12461 : * Note that even if deferrability is requested to be altered along with
12462 : * enforceability, we don't need to explicitly update multiple entries in
12463 : * pg_trigger related to deferrability.
12464 : *
12465 : * Modifying foreign key enforceability involves either creating or
12466 : * dropping the trigger, during which the deferrability setting will be
12467 : * adjusted automatically.
12468 : */
12469 252 : if (cmdcon->alterEnforceability)
12470 : {
12471 148 : if (currcon->contype == CONSTRAINT_FOREIGN)
12472 60 : changed = ATExecAlterFKConstrEnforceability(wqueue, cmdcon, conrel, tgrel,
12473 : currcon->conrelid,
12474 : currcon->confrelid,
12475 : contuple, lockmode,
12476 : InvalidOid, InvalidOid,
12477 : InvalidOid, InvalidOid);
12478 88 : else if (currcon->contype == CONSTRAINT_CHECK)
12479 88 : changed = ATExecAlterCheckConstrEnforceability(wqueue, cmdcon, conrel,
12480 : contuple, recurse, false,
12481 : lockmode);
12482 : }
12483 168 : else if (cmdcon->alterDeferrability &&
12484 64 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, rel,
12485 : contuple, recurse, &otherrelids,
12486 : lockmode))
12487 : {
12488 : /*
12489 : * AlterConstrUpdateConstraintEntry already invalidated relcache for
12490 : * the relations having the constraint itself; here we also invalidate
12491 : * for relations that have any triggers that are part of the
12492 : * constraint.
12493 : */
12494 204 : foreach_oid(relid, otherrelids)
12495 76 : CacheInvalidateRelcacheByRelid(relid);
12496 :
12497 64 : changed = true;
12498 : }
12499 :
12500 : /*
12501 : * Do the catalog work for the inheritability change.
12502 : */
12503 280 : if (cmdcon->alterInheritability &&
12504 40 : ATExecAlterConstrInheritability(wqueue, cmdcon, conrel, rel, contuple,
12505 : lockmode))
12506 36 : changed = true;
12507 :
12508 240 : return changed;
12509 : }
12510 :
12511 : /*
12512 : * Returns true if the foreign key constraint's enforceability is altered.
12513 : *
12514 : * Depending on whether the constraint is being set to ENFORCED or NOT
12515 : * ENFORCED, it creates or drops the trigger accordingly.
12516 : *
12517 : * Note that we must recurse even when trying to change a constraint to not
12518 : * enforced if it is already not enforced, in case descendant constraints
12519 : * might be enforced and need to be changed to not enforced. Conversely, we
12520 : * should do nothing if a constraint is being set to enforced and is already
12521 : * enforced, as descendant constraints cannot be different in that case.
12522 : */
12523 : static bool
12524 128 : ATExecAlterFKConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12525 : Relation conrel, Relation tgrel,
12526 : Oid fkrelid, Oid pkrelid,
12527 : HeapTuple contuple, LOCKMODE lockmode,
12528 : Oid ReferencedParentDelTrigger,
12529 : Oid ReferencedParentUpdTrigger,
12530 : Oid ReferencingParentInsTrigger,
12531 : Oid ReferencingParentUpdTrigger)
12532 : {
12533 : Form_pg_constraint currcon;
12534 : Oid conoid;
12535 : Relation rel;
12536 128 : bool changed = false;
12537 :
12538 : /* Since this function recurses, it could be driven to stack overflow */
12539 128 : check_stack_depth();
12540 :
12541 : Assert(cmdcon->alterEnforceability);
12542 :
12543 128 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12544 128 : conoid = currcon->oid;
12545 :
12546 : /* Should be foreign key constraint */
12547 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12548 :
12549 128 : rel = table_open(currcon->conrelid, lockmode);
12550 :
12551 128 : if (currcon->conenforced != cmdcon->is_enforced)
12552 : {
12553 124 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12554 124 : changed = true;
12555 : }
12556 :
12557 : /* Drop triggers */
12558 128 : if (!cmdcon->is_enforced)
12559 : {
12560 : /*
12561 : * When setting a constraint to NOT ENFORCED, the constraint triggers
12562 : * need to be dropped. Therefore, we must process the child relations
12563 : * first, followed by the parent, to account for dependencies.
12564 : */
12565 92 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12566 40 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12567 12 : AlterFKConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12568 : fkrelid, pkrelid, contuple,
12569 : lockmode, InvalidOid, InvalidOid,
12570 : InvalidOid, InvalidOid);
12571 :
12572 : /* Drop all the triggers */
12573 52 : DropForeignKeyConstraintTriggers(tgrel, conoid, InvalidOid, InvalidOid);
12574 : }
12575 76 : else if (changed) /* Create triggers */
12576 : {
12577 76 : Oid ReferencedDelTriggerOid = InvalidOid,
12578 76 : ReferencedUpdTriggerOid = InvalidOid,
12579 76 : ReferencingInsTriggerOid = InvalidOid,
12580 76 : ReferencingUpdTriggerOid = InvalidOid;
12581 :
12582 : /* Prepare the minimal information required for trigger creation. */
12583 76 : Constraint *fkconstraint = makeNode(Constraint);
12584 :
12585 76 : fkconstraint->conname = pstrdup(NameStr(currcon->conname));
12586 76 : fkconstraint->fk_matchtype = currcon->confmatchtype;
12587 76 : fkconstraint->fk_upd_action = currcon->confupdtype;
12588 76 : fkconstraint->fk_del_action = currcon->confdeltype;
12589 76 : fkconstraint->deferrable = currcon->condeferrable;
12590 76 : fkconstraint->initdeferred = currcon->condeferred;
12591 :
12592 : /* Create referenced triggers */
12593 76 : if (currcon->conrelid == fkrelid)
12594 48 : createForeignKeyActionTriggers(currcon->conrelid,
12595 : currcon->confrelid,
12596 : fkconstraint,
12597 : conoid,
12598 : currcon->conindid,
12599 : ReferencedParentDelTrigger,
12600 : ReferencedParentUpdTrigger,
12601 : &ReferencedDelTriggerOid,
12602 : &ReferencedUpdTriggerOid);
12603 :
12604 : /* Create referencing triggers */
12605 76 : if (currcon->confrelid == pkrelid)
12606 64 : createForeignKeyCheckTriggers(currcon->conrelid,
12607 : pkrelid,
12608 : fkconstraint,
12609 : conoid,
12610 : currcon->conindid,
12611 : ReferencingParentInsTrigger,
12612 : ReferencingParentUpdTrigger,
12613 : &ReferencingInsTriggerOid,
12614 : &ReferencingUpdTriggerOid);
12615 :
12616 : /*
12617 : * Tell Phase 3 to check that the constraint is satisfied by existing
12618 : * rows. Only applies to leaf partitions, and (for constraints that
12619 : * reference a partitioned table) only if this is not one of the
12620 : * pg_constraint rows that exist solely to support action triggers.
12621 : */
12622 76 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
12623 64 : currcon->confrelid == pkrelid)
12624 : {
12625 : AlteredTableInfo *tab;
12626 : NewConstraint *newcon;
12627 :
12628 52 : newcon = palloc0_object(NewConstraint);
12629 52 : newcon->name = fkconstraint->conname;
12630 52 : newcon->contype = CONSTR_FOREIGN;
12631 52 : newcon->refrelid = currcon->confrelid;
12632 52 : newcon->refindid = currcon->conindid;
12633 52 : newcon->conid = currcon->oid;
12634 52 : newcon->qual = (Node *) fkconstraint;
12635 :
12636 : /* Find or create work queue entry for this table */
12637 52 : tab = ATGetQueueEntry(wqueue, rel);
12638 52 : tab->constraints = lappend(tab->constraints, newcon);
12639 : }
12640 :
12641 : /*
12642 : * If the table at either end of the constraint is partitioned, we
12643 : * need to recurse and create triggers for each constraint that is a
12644 : * child of this one.
12645 : */
12646 140 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12647 64 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12648 20 : AlterFKConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12649 : fkrelid, pkrelid, contuple,
12650 : lockmode,
12651 : ReferencedDelTriggerOid,
12652 : ReferencedUpdTriggerOid,
12653 : ReferencingInsTriggerOid,
12654 : ReferencingUpdTriggerOid);
12655 : }
12656 :
12657 128 : table_close(rel, NoLock);
12658 :
12659 128 : return changed;
12660 : }
12661 :
12662 : /*
12663 : * Returns true if the CHECK constraint's enforceability is altered.
12664 : */
12665 : static bool
12666 236 : ATExecAlterCheckConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12667 : Relation conrel, HeapTuple contuple,
12668 : bool recurse, bool recursing, LOCKMODE lockmode)
12669 : {
12670 : Form_pg_constraint currcon;
12671 : Relation rel;
12672 236 : bool changed = false;
12673 236 : List *children = NIL;
12674 :
12675 : /* Since this function recurses, it could be driven to stack overflow */
12676 236 : check_stack_depth();
12677 :
12678 : Assert(cmdcon->alterEnforceability);
12679 :
12680 236 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12681 :
12682 : Assert(currcon->contype == CONSTRAINT_CHECK);
12683 :
12684 : /*
12685 : * Parent relation already locked by caller, children will be locked by
12686 : * find_all_inheritors. So NoLock is fine here.
12687 : */
12688 236 : rel = table_open(currcon->conrelid, NoLock);
12689 :
12690 236 : if (currcon->conenforced != cmdcon->is_enforced)
12691 : {
12692 196 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12693 196 : changed = true;
12694 : }
12695 :
12696 : /*
12697 : * Note that we must recurse even when trying to change a check constraint
12698 : * to not enforced if it is already not enforced, in case descendant
12699 : * constraints might be enforced and need to be changed to not enforced.
12700 : * Conversely, we should do nothing if a constraint is being set to
12701 : * enforced and is already enforced, as descendant constraints cannot be
12702 : * different in that case.
12703 : */
12704 236 : if (!cmdcon->is_enforced || changed)
12705 : {
12706 : /*
12707 : * If we're recursing, the parent has already done this, so skip it.
12708 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't
12709 : * try to look for it in the children.
12710 : */
12711 220 : if (!recursing && !currcon->connoinherit)
12712 84 : children = find_all_inheritors(RelationGetRelid(rel),
12713 : lockmode, NULL);
12714 :
12715 664 : foreach_oid(childoid, children)
12716 : {
12717 240 : if (childoid == RelationGetRelid(rel))
12718 84 : continue;
12719 :
12720 : /*
12721 : * If we are told not to recurse, there had better not be any
12722 : * child tables, because we can't change constraint enforceability
12723 : * on the parent unless we have changed enforceability for all
12724 : * child.
12725 : */
12726 156 : if (!recurse)
12727 8 : ereport(ERROR,
12728 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12729 : errmsg("constraint must be altered on child tables too"),
12730 : errhint("Do not specify the ONLY keyword."));
12731 :
12732 148 : AlterCheckConstrEnforceabilityRecurse(wqueue, cmdcon, conrel,
12733 : childoid, false, true,
12734 : lockmode);
12735 : }
12736 : }
12737 :
12738 : /*
12739 : * Tell Phase 3 to check that the constraint is satisfied by existing
12740 : * rows. We only need do this when altering the constraint from NOT
12741 : * ENFORCED to ENFORCED.
12742 : */
12743 228 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
12744 180 : !currcon->conenforced &&
12745 128 : cmdcon->is_enforced)
12746 : {
12747 : AlteredTableInfo *tab;
12748 : NewConstraint *newcon;
12749 : Datum val;
12750 : char *conbin;
12751 :
12752 116 : newcon = palloc0_object(NewConstraint);
12753 116 : newcon->name = pstrdup(NameStr(currcon->conname));
12754 116 : newcon->contype = CONSTR_CHECK;
12755 :
12756 116 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
12757 : Anum_pg_constraint_conbin);
12758 116 : conbin = TextDatumGetCString(val);
12759 116 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
12760 :
12761 : /* Find or create work queue entry for this table */
12762 116 : tab = ATGetQueueEntry(wqueue, rel);
12763 116 : tab->constraints = lappend(tab->constraints, newcon);
12764 : }
12765 :
12766 228 : table_close(rel, NoLock);
12767 :
12768 228 : return changed;
12769 : }
12770 :
12771 : /*
12772 : * Invokes ATExecAlterCheckConstrEnforceability for each CHECK constraint that
12773 : * is a child of the specified constraint.
12774 : *
12775 : * We rely on the parent and child tables having identical CHECK constraint
12776 : * names to retrieve the child's pg_constraint tuple.
12777 : *
12778 : * The arguments to this function have the same meaning as the arguments to
12779 : * ATExecAlterCheckConstrEnforceability.
12780 : */
12781 : static void
12782 148 : AlterCheckConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12783 : Relation conrel, Oid conrelid,
12784 : bool recurse, bool recursing,
12785 : LOCKMODE lockmode)
12786 : {
12787 : SysScanDesc pscan;
12788 : HeapTuple childtup;
12789 : ScanKeyData skey[3];
12790 :
12791 148 : ScanKeyInit(&skey[0],
12792 : Anum_pg_constraint_conrelid,
12793 : BTEqualStrategyNumber, F_OIDEQ,
12794 : ObjectIdGetDatum(conrelid));
12795 148 : ScanKeyInit(&skey[1],
12796 : Anum_pg_constraint_contypid,
12797 : BTEqualStrategyNumber, F_OIDEQ,
12798 : ObjectIdGetDatum(InvalidOid));
12799 148 : ScanKeyInit(&skey[2],
12800 : Anum_pg_constraint_conname,
12801 : BTEqualStrategyNumber, F_NAMEEQ,
12802 148 : CStringGetDatum(cmdcon->conname));
12803 :
12804 148 : pscan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId, true,
12805 : NULL, 3, skey);
12806 :
12807 148 : if (!HeapTupleIsValid(childtup = systable_getnext(pscan)))
12808 0 : ereport(ERROR,
12809 : errcode(ERRCODE_UNDEFINED_OBJECT),
12810 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12811 : cmdcon->conname, get_rel_name(conrelid)));
12812 :
12813 148 : ATExecAlterCheckConstrEnforceability(wqueue, cmdcon, conrel, childtup,
12814 : recurse, recursing, lockmode);
12815 :
12816 148 : systable_endscan(pscan);
12817 148 : }
12818 :
12819 : /*
12820 : * Returns true if the constraint's deferrability is altered.
12821 : *
12822 : * *otherrelids is appended OIDs of relations containing affected triggers.
12823 : *
12824 : * Note that we must recurse even when the values are correct, in case
12825 : * indirect descendants have had their constraints altered locally.
12826 : * (This could be avoided if we forbade altering constraints in partitions
12827 : * but existing releases don't do that.)
12828 : */
12829 : static bool
12830 108 : ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
12831 : Relation conrel, Relation tgrel, Relation rel,
12832 : HeapTuple contuple, bool recurse,
12833 : List **otherrelids, LOCKMODE lockmode)
12834 : {
12835 : Form_pg_constraint currcon;
12836 : Oid refrelid;
12837 108 : bool changed = false;
12838 :
12839 : /* since this function recurses, it could be driven to stack overflow */
12840 108 : check_stack_depth();
12841 :
12842 : Assert(cmdcon->alterDeferrability);
12843 :
12844 108 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12845 108 : refrelid = currcon->confrelid;
12846 :
12847 : /* Should be foreign key constraint */
12848 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12849 :
12850 : /*
12851 : * If called to modify a constraint that's already in the desired state,
12852 : * silently do nothing.
12853 : */
12854 108 : if (currcon->condeferrable != cmdcon->deferrable ||
12855 4 : currcon->condeferred != cmdcon->initdeferred)
12856 : {
12857 108 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12858 108 : changed = true;
12859 :
12860 : /*
12861 : * Now we need to update the multiple entries in pg_trigger that
12862 : * implement the constraint.
12863 : */
12864 108 : AlterConstrTriggerDeferrability(currcon->oid, tgrel, rel,
12865 108 : cmdcon->deferrable,
12866 108 : cmdcon->initdeferred, otherrelids);
12867 : }
12868 :
12869 : /*
12870 : * If the table at either end of the constraint is partitioned, we need to
12871 : * handle every constraint that is a child of this one.
12872 : */
12873 108 : if (recurse && changed &&
12874 200 : (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12875 92 : get_rel_relkind(refrelid) == RELKIND_PARTITIONED_TABLE))
12876 28 : AlterConstrDeferrabilityRecurse(wqueue, cmdcon, conrel, tgrel, rel,
12877 : contuple, recurse, otherrelids,
12878 : lockmode);
12879 :
12880 108 : return changed;
12881 : }
12882 :
12883 : /*
12884 : * Returns true if the constraint's inheritability is altered.
12885 : */
12886 : static bool
12887 40 : ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
12888 : Relation conrel, Relation rel,
12889 : HeapTuple contuple, LOCKMODE lockmode)
12890 : {
12891 : Form_pg_constraint currcon;
12892 : AttrNumber colNum;
12893 : char *colName;
12894 : List *children;
12895 :
12896 : Assert(cmdcon->alterInheritability);
12897 :
12898 40 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12899 :
12900 : /* The current implementation only works for NOT NULL constraints */
12901 : Assert(currcon->contype == CONSTRAINT_NOTNULL);
12902 :
12903 : /*
12904 : * If called to modify a constraint that's already in the desired state,
12905 : * silently do nothing.
12906 : */
12907 40 : if (cmdcon->noinherit == currcon->connoinherit)
12908 0 : return false;
12909 :
12910 40 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12911 40 : CommandCounterIncrement();
12912 :
12913 : /* Fetch the column number and name */
12914 40 : colNum = extractNotNullColumn(contuple);
12915 40 : colName = get_attname(currcon->conrelid, colNum, false);
12916 :
12917 : /*
12918 : * Propagate the change to children. For this subcommand type we don't
12919 : * recursively affect children, just the immediate level.
12920 : */
12921 40 : children = find_inheritance_children(RelationGetRelid(rel),
12922 : lockmode);
12923 128 : foreach_oid(childoid, children)
12924 : {
12925 : ObjectAddress addr;
12926 :
12927 56 : if (cmdcon->noinherit)
12928 : {
12929 : HeapTuple childtup;
12930 : Form_pg_constraint childcon;
12931 :
12932 20 : childtup = findNotNullConstraint(childoid, colName);
12933 20 : if (!childtup)
12934 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
12935 : colName, childoid);
12936 20 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12937 : Assert(childcon->coninhcount > 0);
12938 20 : childcon->coninhcount--;
12939 20 : childcon->conislocal = true;
12940 20 : CatalogTupleUpdate(conrel, &childtup->t_self, childtup);
12941 20 : heap_freetuple(childtup);
12942 : }
12943 : else
12944 : {
12945 36 : Relation childrel = table_open(childoid, NoLock);
12946 :
12947 36 : addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
12948 : colName, true, true, lockmode);
12949 32 : if (OidIsValid(addr.objectId))
12950 32 : CommandCounterIncrement();
12951 32 : table_close(childrel, NoLock);
12952 : }
12953 : }
12954 :
12955 36 : return true;
12956 : }
12957 :
12958 : /*
12959 : * A subroutine of ATExecAlterConstrDeferrability that updated constraint
12960 : * trigger's deferrability.
12961 : *
12962 : * The arguments to this function have the same meaning as the arguments to
12963 : * ATExecAlterConstrDeferrability.
12964 : */
12965 : static void
12966 108 : AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
12967 : bool deferrable, bool initdeferred,
12968 : List **otherrelids)
12969 : {
12970 : HeapTuple tgtuple;
12971 : ScanKeyData tgkey;
12972 : SysScanDesc tgscan;
12973 :
12974 108 : ScanKeyInit(&tgkey,
12975 : Anum_pg_trigger_tgconstraint,
12976 : BTEqualStrategyNumber, F_OIDEQ,
12977 : ObjectIdGetDatum(conoid));
12978 108 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
12979 : NULL, 1, &tgkey);
12980 420 : while (HeapTupleIsValid(tgtuple = systable_getnext(tgscan)))
12981 : {
12982 312 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tgtuple);
12983 : Form_pg_trigger copy_tg;
12984 : HeapTuple tgCopyTuple;
12985 :
12986 : /*
12987 : * Remember OIDs of other relation(s) involved in FK constraint.
12988 : * (Note: it's likely that we could skip forcing a relcache inval for
12989 : * other rels that don't have a trigger whose properties change, but
12990 : * let's be conservative.)
12991 : */
12992 312 : if (tgform->tgrelid != RelationGetRelid(rel))
12993 152 : *otherrelids = list_append_unique_oid(*otherrelids,
12994 : tgform->tgrelid);
12995 :
12996 : /*
12997 : * Update enable status and deferrability of RI_FKey_noaction_del,
12998 : * RI_FKey_noaction_upd, RI_FKey_check_ins and RI_FKey_check_upd
12999 : * triggers, but not others; see createForeignKeyActionTriggers and
13000 : * CreateFKCheckTrigger.
13001 : */
13002 312 : if (tgform->tgfoid != F_RI_FKEY_NOACTION_DEL &&
13003 248 : tgform->tgfoid != F_RI_FKEY_NOACTION_UPD &&
13004 172 : tgform->tgfoid != F_RI_FKEY_CHECK_INS &&
13005 92 : tgform->tgfoid != F_RI_FKEY_CHECK_UPD)
13006 12 : continue;
13007 :
13008 300 : tgCopyTuple = heap_copytuple(tgtuple);
13009 300 : copy_tg = (Form_pg_trigger) GETSTRUCT(tgCopyTuple);
13010 :
13011 300 : copy_tg->tgdeferrable = deferrable;
13012 300 : copy_tg->tginitdeferred = initdeferred;
13013 300 : CatalogTupleUpdate(tgrel, &tgCopyTuple->t_self, tgCopyTuple);
13014 :
13015 300 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
13016 :
13017 300 : heap_freetuple(tgCopyTuple);
13018 : }
13019 :
13020 108 : systable_endscan(tgscan);
13021 108 : }
13022 :
13023 : /*
13024 : * Invokes ATExecAlterFKConstrEnforceability for each foreign key constraint
13025 : * that is a child of the specified constraint.
13026 : *
13027 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
13028 : * list of child relations and recursing; instead it uses the conparentid
13029 : * relationships. This may need to be reconsidered.
13030 : *
13031 : * The arguments to this function have the same meaning as the arguments to
13032 : * ATExecAlterFKConstrEnforceability.
13033 : */
13034 : static void
13035 32 : AlterFKConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
13036 : Relation conrel, Relation tgrel,
13037 : Oid fkrelid, Oid pkrelid,
13038 : HeapTuple contuple, LOCKMODE lockmode,
13039 : Oid ReferencedParentDelTrigger,
13040 : Oid ReferencedParentUpdTrigger,
13041 : Oid ReferencingParentInsTrigger,
13042 : Oid ReferencingParentUpdTrigger)
13043 : {
13044 : Form_pg_constraint currcon;
13045 : Oid conoid;
13046 : ScanKeyData pkey;
13047 : SysScanDesc pscan;
13048 : HeapTuple childtup;
13049 :
13050 32 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
13051 32 : conoid = currcon->oid;
13052 :
13053 32 : ScanKeyInit(&pkey,
13054 : Anum_pg_constraint_conparentid,
13055 : BTEqualStrategyNumber, F_OIDEQ,
13056 : ObjectIdGetDatum(conoid));
13057 :
13058 32 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13059 : true, NULL, 1, &pkey);
13060 :
13061 100 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13062 68 : ATExecAlterFKConstrEnforceability(wqueue, cmdcon, conrel, tgrel, fkrelid,
13063 : pkrelid, childtup, lockmode,
13064 : ReferencedParentDelTrigger,
13065 : ReferencedParentUpdTrigger,
13066 : ReferencingParentInsTrigger,
13067 : ReferencingParentUpdTrigger);
13068 :
13069 32 : systable_endscan(pscan);
13070 32 : }
13071 :
13072 : /*
13073 : * Invokes ATExecAlterConstrDeferrability for each constraint that is a child of
13074 : * the specified constraint.
13075 : *
13076 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
13077 : * list of child relations and recursing; instead it uses the conparentid
13078 : * relationships. This may need to be reconsidered.
13079 : *
13080 : * The arguments to this function have the same meaning as the arguments to
13081 : * ATExecAlterConstrDeferrability.
13082 : */
13083 : static void
13084 28 : AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
13085 : Relation conrel, Relation tgrel, Relation rel,
13086 : HeapTuple contuple, bool recurse,
13087 : List **otherrelids, LOCKMODE lockmode)
13088 : {
13089 : Form_pg_constraint currcon;
13090 : Oid conoid;
13091 : ScanKeyData pkey;
13092 : SysScanDesc pscan;
13093 : HeapTuple childtup;
13094 :
13095 28 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
13096 28 : conoid = currcon->oid;
13097 :
13098 28 : ScanKeyInit(&pkey,
13099 : Anum_pg_constraint_conparentid,
13100 : BTEqualStrategyNumber, F_OIDEQ,
13101 : ObjectIdGetDatum(conoid));
13102 :
13103 28 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13104 : true, NULL, 1, &pkey);
13105 :
13106 72 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13107 : {
13108 44 : Form_pg_constraint childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13109 : Relation childrel;
13110 :
13111 44 : childrel = table_open(childcon->conrelid, lockmode);
13112 :
13113 44 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, childrel,
13114 : childtup, recurse, otherrelids, lockmode);
13115 44 : table_close(childrel, NoLock);
13116 : }
13117 :
13118 28 : systable_endscan(pscan);
13119 28 : }
13120 :
13121 : /*
13122 : * Update the constraint entry for the given ATAlterConstraint command, and
13123 : * invoke the appropriate hooks.
13124 : */
13125 : static void
13126 468 : AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
13127 : HeapTuple contuple)
13128 : {
13129 : HeapTuple copyTuple;
13130 : Form_pg_constraint copy_con;
13131 :
13132 : Assert(cmdcon->alterEnforceability || cmdcon->alterDeferrability ||
13133 : cmdcon->alterInheritability);
13134 :
13135 468 : copyTuple = heap_copytuple(contuple);
13136 468 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13137 :
13138 468 : if (cmdcon->alterEnforceability)
13139 : {
13140 320 : copy_con->conenforced = cmdcon->is_enforced;
13141 :
13142 : /*
13143 : * NB: The convalidated status is irrelevant when the constraint is
13144 : * set to NOT ENFORCED, but for consistency, it should still be set
13145 : * appropriately. Similarly, if the constraint is later changed to
13146 : * ENFORCED, validation will be performed during phase 3, so it makes
13147 : * sense to mark it as valid in that case.
13148 : */
13149 320 : copy_con->convalidated = cmdcon->is_enforced;
13150 : }
13151 468 : if (cmdcon->alterDeferrability)
13152 : {
13153 112 : copy_con->condeferrable = cmdcon->deferrable;
13154 112 : copy_con->condeferred = cmdcon->initdeferred;
13155 : }
13156 468 : if (cmdcon->alterInheritability)
13157 40 : copy_con->connoinherit = cmdcon->noinherit;
13158 :
13159 468 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13160 468 : InvokeObjectPostAlterHook(ConstraintRelationId, copy_con->oid, 0);
13161 :
13162 : /* Make new constraint flags visible to others */
13163 468 : CacheInvalidateRelcacheByRelid(copy_con->conrelid);
13164 :
13165 468 : heap_freetuple(copyTuple);
13166 468 : }
13167 :
13168 : /*
13169 : * ALTER TABLE VALIDATE CONSTRAINT
13170 : *
13171 : * XXX The reason we handle recursion here rather than at Phase 1 is because
13172 : * there's no good way to skip recursing when handling foreign keys: there is
13173 : * no need to lock children in that case, yet we wouldn't be able to avoid
13174 : * doing so at that level.
13175 : *
13176 : * Return value is the address of the validated constraint. If the constraint
13177 : * was already validated, InvalidObjectAddress is returned.
13178 : */
13179 : static ObjectAddress
13180 347 : ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
13181 : bool recurse, bool recursing, LOCKMODE lockmode)
13182 : {
13183 : Relation conrel;
13184 : SysScanDesc scan;
13185 : ScanKeyData skey[3];
13186 : HeapTuple tuple;
13187 : Form_pg_constraint con;
13188 : ObjectAddress address;
13189 :
13190 347 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
13191 :
13192 : /*
13193 : * Find and check the target constraint
13194 : */
13195 347 : ScanKeyInit(&skey[0],
13196 : Anum_pg_constraint_conrelid,
13197 : BTEqualStrategyNumber, F_OIDEQ,
13198 : ObjectIdGetDatum(RelationGetRelid(rel)));
13199 347 : ScanKeyInit(&skey[1],
13200 : Anum_pg_constraint_contypid,
13201 : BTEqualStrategyNumber, F_OIDEQ,
13202 : ObjectIdGetDatum(InvalidOid));
13203 347 : ScanKeyInit(&skey[2],
13204 : Anum_pg_constraint_conname,
13205 : BTEqualStrategyNumber, F_NAMEEQ,
13206 : CStringGetDatum(constrName));
13207 347 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
13208 : true, NULL, 3, skey);
13209 :
13210 : /* There can be at most one matching row */
13211 347 : if (!HeapTupleIsValid(tuple = systable_getnext(scan)))
13212 0 : ereport(ERROR,
13213 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13214 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
13215 : constrName, RelationGetRelationName(rel))));
13216 :
13217 347 : con = (Form_pg_constraint) GETSTRUCT(tuple);
13218 347 : if (con->contype != CONSTRAINT_FOREIGN &&
13219 170 : con->contype != CONSTRAINT_CHECK &&
13220 74 : con->contype != CONSTRAINT_NOTNULL)
13221 0 : ereport(ERROR,
13222 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
13223 : errmsg("cannot validate constraint \"%s\" of relation \"%s\"",
13224 : constrName, RelationGetRelationName(rel)),
13225 : errdetail("This operation is not supported for this type of constraint."));
13226 :
13227 347 : if (!con->conenforced)
13228 4 : ereport(ERROR,
13229 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13230 : errmsg("cannot validate NOT ENFORCED constraint")));
13231 :
13232 343 : if (!con->convalidated)
13233 : {
13234 331 : if (con->contype == CONSTRAINT_FOREIGN)
13235 : {
13236 173 : QueueFKConstraintValidation(wqueue, conrel, rel, con->confrelid,
13237 : tuple, lockmode);
13238 : }
13239 158 : else if (con->contype == CONSTRAINT_CHECK)
13240 : {
13241 84 : QueueCheckConstraintValidation(wqueue, conrel, rel, constrName,
13242 : tuple, recurse, recursing, lockmode);
13243 : }
13244 74 : else if (con->contype == CONSTRAINT_NOTNULL)
13245 : {
13246 74 : QueueNNConstraintValidation(wqueue, conrel, rel,
13247 : tuple, recurse, recursing, lockmode);
13248 : }
13249 :
13250 331 : ObjectAddressSet(address, ConstraintRelationId, con->oid);
13251 : }
13252 : else
13253 12 : address = InvalidObjectAddress; /* already validated */
13254 :
13255 343 : systable_endscan(scan);
13256 :
13257 343 : table_close(conrel, RowExclusiveLock);
13258 :
13259 343 : return address;
13260 : }
13261 :
13262 : /*
13263 : * QueueFKConstraintValidation
13264 : *
13265 : * Add an entry to the wqueue to validate the given foreign key constraint in
13266 : * Phase 3 and update the convalidated field in the pg_constraint catalog
13267 : * for the specified relation and all its children.
13268 : */
13269 : static void
13270 225 : QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
13271 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode)
13272 : {
13273 : Form_pg_constraint con;
13274 : AlteredTableInfo *tab;
13275 : HeapTuple copyTuple;
13276 : Form_pg_constraint copy_con;
13277 :
13278 225 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13279 : Assert(con->contype == CONSTRAINT_FOREIGN);
13280 : Assert(!con->convalidated);
13281 :
13282 : /*
13283 : * Add the validation to phase 3's queue; not needed for partitioned
13284 : * tables themselves, only for their partitions.
13285 : *
13286 : * When the referenced table (pkrelid) is partitioned, the referencing
13287 : * table (fkrel) has one pg_constraint row pointing to each partition
13288 : * thereof. These rows are there only to support action triggers and no
13289 : * table scan is needed, therefore skip this for them as well.
13290 : */
13291 225 : if (fkrel->rd_rel->relkind == RELKIND_RELATION &&
13292 193 : con->confrelid == pkrelid)
13293 : {
13294 : NewConstraint *newcon;
13295 : Constraint *fkconstraint;
13296 :
13297 : /* Queue validation for phase 3 */
13298 181 : fkconstraint = makeNode(Constraint);
13299 : /* for now this is all we need */
13300 181 : fkconstraint->conname = pstrdup(NameStr(con->conname));
13301 :
13302 181 : newcon = palloc0_object(NewConstraint);
13303 181 : newcon->name = fkconstraint->conname;
13304 181 : newcon->contype = CONSTR_FOREIGN;
13305 181 : newcon->refrelid = con->confrelid;
13306 181 : newcon->refindid = con->conindid;
13307 181 : newcon->conid = con->oid;
13308 181 : newcon->qual = (Node *) fkconstraint;
13309 :
13310 : /* Find or create work queue entry for this table */
13311 181 : tab = ATGetQueueEntry(wqueue, fkrel);
13312 181 : tab->constraints = lappend(tab->constraints, newcon);
13313 : }
13314 :
13315 : /*
13316 : * If the table at either end of the constraint is partitioned, we need to
13317 : * recurse and handle every unvalidated constraint that is a child of this
13318 : * constraint.
13319 : */
13320 418 : if (fkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
13321 193 : get_rel_relkind(con->confrelid) == RELKIND_PARTITIONED_TABLE)
13322 : {
13323 : ScanKeyData pkey;
13324 : SysScanDesc pscan;
13325 : HeapTuple childtup;
13326 :
13327 52 : ScanKeyInit(&pkey,
13328 : Anum_pg_constraint_conparentid,
13329 : BTEqualStrategyNumber, F_OIDEQ,
13330 : ObjectIdGetDatum(con->oid));
13331 :
13332 52 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13333 : true, NULL, 1, &pkey);
13334 :
13335 104 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13336 : {
13337 : Form_pg_constraint childcon;
13338 : Relation childrel;
13339 :
13340 52 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13341 :
13342 : /*
13343 : * If the child constraint has already been validated, no further
13344 : * action is required for it or its descendants, as they are all
13345 : * valid.
13346 : */
13347 52 : if (childcon->convalidated)
13348 12 : continue;
13349 :
13350 40 : childrel = table_open(childcon->conrelid, lockmode);
13351 :
13352 : /*
13353 : * NB: Note that pkrelid should be passed as-is during recursion,
13354 : * as it is required to identify the root referenced table.
13355 : */
13356 40 : QueueFKConstraintValidation(wqueue, conrel, childrel, pkrelid,
13357 : childtup, lockmode);
13358 40 : table_close(childrel, NoLock);
13359 : }
13360 :
13361 52 : systable_endscan(pscan);
13362 : }
13363 :
13364 : /*
13365 : * Now mark the pg_constraint row as validated (even if we didn't check,
13366 : * notably the ones for partitions on the referenced side).
13367 : *
13368 : * We rely on transaction abort to roll back this change if phase 3
13369 : * ultimately finds violating rows. This is a bit ugly.
13370 : */
13371 225 : copyTuple = heap_copytuple(contuple);
13372 225 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13373 225 : copy_con->convalidated = true;
13374 225 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13375 :
13376 225 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13377 :
13378 225 : heap_freetuple(copyTuple);
13379 225 : }
13380 :
13381 : /*
13382 : * QueueCheckConstraintValidation
13383 : *
13384 : * Add an entry to the wqueue to validate the given check constraint in Phase 3
13385 : * and update the convalidated field in the pg_constraint catalog for the
13386 : * specified relation and all its inheriting children.
13387 : */
13388 : static void
13389 84 : QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13390 : char *constrName, HeapTuple contuple,
13391 : bool recurse, bool recursing, LOCKMODE lockmode)
13392 : {
13393 : Form_pg_constraint con;
13394 : AlteredTableInfo *tab;
13395 : HeapTuple copyTuple;
13396 : Form_pg_constraint copy_con;
13397 :
13398 84 : List *children = NIL;
13399 : ListCell *child;
13400 : NewConstraint *newcon;
13401 : Datum val;
13402 : char *conbin;
13403 :
13404 84 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13405 : Assert(con->contype == CONSTRAINT_CHECK);
13406 :
13407 : /*
13408 : * If we're recursing, the parent has already done this, so skip it. Also,
13409 : * if the constraint is a NO INHERIT constraint, we shouldn't try to look
13410 : * for it in the children.
13411 : */
13412 84 : if (!recursing && !con->connoinherit)
13413 48 : children = find_all_inheritors(RelationGetRelid(rel),
13414 : lockmode, NULL);
13415 :
13416 : /*
13417 : * For CHECK constraints, we must ensure that we only mark the constraint
13418 : * as validated on the parent if it's already validated on the children.
13419 : *
13420 : * We recurse before validating on the parent, to reduce risk of
13421 : * deadlocks.
13422 : */
13423 164 : foreach(child, children)
13424 : {
13425 80 : Oid childoid = lfirst_oid(child);
13426 : Relation childrel;
13427 :
13428 80 : if (childoid == RelationGetRelid(rel))
13429 48 : continue;
13430 :
13431 : /*
13432 : * If we are told not to recurse, there had better not be any child
13433 : * tables, because we can't mark the constraint on the parent valid
13434 : * unless it is valid for all child tables.
13435 : */
13436 32 : if (!recurse)
13437 0 : ereport(ERROR,
13438 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13439 : errmsg("constraint must be validated on child tables too")));
13440 :
13441 : /* find_all_inheritors already got lock */
13442 32 : childrel = table_open(childoid, NoLock);
13443 :
13444 32 : ATExecValidateConstraint(wqueue, childrel, constrName, false,
13445 : true, lockmode);
13446 32 : table_close(childrel, NoLock);
13447 : }
13448 :
13449 : /* Queue validation for phase 3 */
13450 84 : newcon = palloc0_object(NewConstraint);
13451 84 : newcon->name = constrName;
13452 84 : newcon->contype = CONSTR_CHECK;
13453 84 : newcon->refrelid = InvalidOid;
13454 84 : newcon->refindid = InvalidOid;
13455 84 : newcon->conid = con->oid;
13456 :
13457 84 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
13458 : Anum_pg_constraint_conbin);
13459 84 : conbin = TextDatumGetCString(val);
13460 84 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
13461 :
13462 : /* Find or create work queue entry for this table */
13463 84 : tab = ATGetQueueEntry(wqueue, rel);
13464 84 : tab->constraints = lappend(tab->constraints, newcon);
13465 :
13466 : /*
13467 : * Invalidate relcache so that others see the new validated constraint.
13468 : */
13469 84 : CacheInvalidateRelcache(rel);
13470 :
13471 : /*
13472 : * Now update the catalog, while we have the door open.
13473 : */
13474 84 : copyTuple = heap_copytuple(contuple);
13475 84 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13476 84 : copy_con->convalidated = true;
13477 84 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13478 :
13479 84 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13480 :
13481 84 : heap_freetuple(copyTuple);
13482 84 : }
13483 :
13484 : /*
13485 : * QueueNNConstraintValidation
13486 : *
13487 : * Add an entry to the wqueue to validate the given not-null constraint in
13488 : * Phase 3 and update the convalidated field in the pg_constraint catalog for
13489 : * the specified relation and all its inheriting children.
13490 : */
13491 : static void
13492 74 : QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13493 : HeapTuple contuple, bool recurse, bool recursing,
13494 : LOCKMODE lockmode)
13495 : {
13496 : Form_pg_constraint con;
13497 : AlteredTableInfo *tab;
13498 : HeapTuple copyTuple;
13499 : Form_pg_constraint copy_con;
13500 74 : List *children = NIL;
13501 : AttrNumber attnum;
13502 : char *colname;
13503 :
13504 74 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13505 : Assert(con->contype == CONSTRAINT_NOTNULL);
13506 :
13507 74 : attnum = extractNotNullColumn(contuple);
13508 :
13509 : /*
13510 : * If we're recursing, we've already done this for parent, so skip it.
13511 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't try to
13512 : * look for it in the children.
13513 : *
13514 : * We recurse before validating on the parent, to reduce risk of
13515 : * deadlocks.
13516 : */
13517 74 : if (!recursing && !con->connoinherit)
13518 50 : children = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
13519 :
13520 74 : colname = get_attname(RelationGetRelid(rel), attnum, false);
13521 250 : foreach_oid(childoid, children)
13522 : {
13523 : Relation childrel;
13524 : HeapTuple contup;
13525 : Form_pg_constraint childcon;
13526 : char *conname;
13527 :
13528 102 : if (childoid == RelationGetRelid(rel))
13529 50 : continue;
13530 :
13531 : /*
13532 : * If we are told not to recurse, there had better not be any child
13533 : * tables, because we can't mark the constraint on the parent valid
13534 : * unless it is valid for all child tables.
13535 : */
13536 52 : if (!recurse)
13537 0 : ereport(ERROR,
13538 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13539 : errmsg("constraint must be validated on child tables too"));
13540 :
13541 : /*
13542 : * The column on child might have a different attnum, so search by
13543 : * column name.
13544 : */
13545 52 : contup = findNotNullConstraint(childoid, colname);
13546 52 : if (!contup)
13547 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
13548 : colname, get_rel_name(childoid));
13549 52 : childcon = (Form_pg_constraint) GETSTRUCT(contup);
13550 52 : if (childcon->convalidated)
13551 28 : continue;
13552 :
13553 : /* find_all_inheritors already got lock */
13554 24 : childrel = table_open(childoid, NoLock);
13555 24 : conname = pstrdup(NameStr(childcon->conname));
13556 :
13557 : /* XXX improve ATExecValidateConstraint API to avoid double search */
13558 24 : ATExecValidateConstraint(wqueue, childrel, conname,
13559 : false, true, lockmode);
13560 24 : table_close(childrel, NoLock);
13561 : }
13562 :
13563 : /* Set attnotnull appropriately without queueing another validation */
13564 74 : set_attnotnull(NULL, rel, attnum, true, false);
13565 :
13566 74 : tab = ATGetQueueEntry(wqueue, rel);
13567 74 : tab->verify_new_notnull = true;
13568 :
13569 : /*
13570 : * Invalidate relcache so that others see the new validated constraint.
13571 : */
13572 74 : CacheInvalidateRelcache(rel);
13573 :
13574 : /*
13575 : * Now update the catalogs, while we have the door open.
13576 : */
13577 74 : copyTuple = heap_copytuple(contuple);
13578 74 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13579 74 : copy_con->convalidated = true;
13580 74 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13581 :
13582 74 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13583 :
13584 74 : heap_freetuple(copyTuple);
13585 74 : }
13586 :
13587 : /*
13588 : * transformColumnNameList - transform list of column names
13589 : *
13590 : * Lookup each name and return its attnum and, optionally, type and collation
13591 : * OIDs
13592 : *
13593 : * Note: the name of this function suggests that it's general-purpose,
13594 : * but actually it's only used to look up names appearing in foreign-key
13595 : * clauses. The error messages would need work to use it in other cases,
13596 : * and perhaps the validity checks as well.
13597 : */
13598 : static int
13599 4499 : transformColumnNameList(Oid relId, List *colList,
13600 : int16 *attnums, Oid *atttypids, Oid *attcollids)
13601 : {
13602 : ListCell *l;
13603 : int attnum;
13604 :
13605 4499 : attnum = 0;
13606 8191 : foreach(l, colList)
13607 : {
13608 3736 : char *attname = strVal(lfirst(l));
13609 : HeapTuple atttuple;
13610 : Form_pg_attribute attform;
13611 :
13612 3736 : atttuple = SearchSysCacheAttName(relId, attname);
13613 3736 : if (!HeapTupleIsValid(atttuple))
13614 36 : ereport(ERROR,
13615 : (errcode(ERRCODE_UNDEFINED_COLUMN),
13616 : errmsg("column \"%s\" referenced in foreign key constraint does not exist",
13617 : attname)));
13618 3700 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
13619 3700 : if (attform->attnum < 0)
13620 8 : ereport(ERROR,
13621 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
13622 : errmsg("system columns cannot be used in foreign keys")));
13623 3692 : if (attnum >= INDEX_MAX_KEYS)
13624 0 : ereport(ERROR,
13625 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
13626 : errmsg("cannot have more than %d keys in a foreign key",
13627 : INDEX_MAX_KEYS)));
13628 3692 : attnums[attnum] = attform->attnum;
13629 3692 : if (atttypids != NULL)
13630 3668 : atttypids[attnum] = attform->atttypid;
13631 3692 : if (attcollids != NULL)
13632 3668 : attcollids[attnum] = attform->attcollation;
13633 3692 : ReleaseSysCache(atttuple);
13634 3692 : attnum++;
13635 : }
13636 :
13637 4455 : return attnum;
13638 : }
13639 :
13640 : /*
13641 : * transformFkeyGetPrimaryKey -
13642 : *
13643 : * Look up the names, attnums, types, and collations of the primary key attributes
13644 : * for the pkrel. Also return the index OID and index opclasses of the
13645 : * index supporting the primary key. Also return whether the index has
13646 : * WITHOUT OVERLAPS.
13647 : *
13648 : * All parameters except pkrel are output parameters. Also, the function
13649 : * return value is the number of attributes in the primary key.
13650 : *
13651 : * Used when the column list in the REFERENCES specification is omitted.
13652 : */
13653 : static int
13654 896 : transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
13655 : List **attnamelist,
13656 : int16 *attnums, Oid *atttypids, Oid *attcollids,
13657 : Oid *opclasses, bool *pk_has_without_overlaps)
13658 : {
13659 : List *indexoidlist;
13660 : ListCell *indexoidscan;
13661 896 : HeapTuple indexTuple = NULL;
13662 896 : Form_pg_index indexStruct = NULL;
13663 : Datum indclassDatum;
13664 : oidvector *indclass;
13665 : int i;
13666 :
13667 : /*
13668 : * Get the list of index OIDs for the table from the relcache, and look up
13669 : * each one in the pg_index syscache until we find one marked primary key
13670 : * (hopefully there isn't more than one such). Insist it's valid, too.
13671 : */
13672 896 : *indexOid = InvalidOid;
13673 :
13674 896 : indexoidlist = RelationGetIndexList(pkrel);
13675 :
13676 900 : foreach(indexoidscan, indexoidlist)
13677 : {
13678 900 : Oid indexoid = lfirst_oid(indexoidscan);
13679 :
13680 900 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13681 900 : if (!HeapTupleIsValid(indexTuple))
13682 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13683 900 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13684 900 : if (indexStruct->indisprimary && indexStruct->indisvalid)
13685 : {
13686 : /*
13687 : * Refuse to use a deferrable primary key. This is per SQL spec,
13688 : * and there would be a lot of interesting semantic problems if we
13689 : * tried to allow it.
13690 : */
13691 896 : if (!indexStruct->indimmediate)
13692 0 : ereport(ERROR,
13693 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13694 : errmsg("cannot use a deferrable primary key for referenced table \"%s\"",
13695 : RelationGetRelationName(pkrel))));
13696 :
13697 896 : *indexOid = indexoid;
13698 896 : break;
13699 : }
13700 4 : ReleaseSysCache(indexTuple);
13701 : }
13702 :
13703 896 : list_free(indexoidlist);
13704 :
13705 : /*
13706 : * Check that we found it
13707 : */
13708 896 : if (!OidIsValid(*indexOid))
13709 0 : ereport(ERROR,
13710 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13711 : errmsg("there is no primary key for referenced table \"%s\"",
13712 : RelationGetRelationName(pkrel))));
13713 :
13714 : /* Must get indclass the hard way */
13715 896 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13716 : Anum_pg_index_indclass);
13717 896 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13718 :
13719 : /*
13720 : * Now build the list of PK attributes from the indkey definition (we
13721 : * assume a primary key cannot have expressional elements)
13722 : */
13723 896 : *attnamelist = NIL;
13724 2108 : for (i = 0; i < indexStruct->indnkeyatts; i++)
13725 : {
13726 1212 : int pkattno = indexStruct->indkey.values[i];
13727 :
13728 1212 : attnums[i] = pkattno;
13729 1212 : atttypids[i] = attnumTypeId(pkrel, pkattno);
13730 1212 : attcollids[i] = attnumCollationId(pkrel, pkattno);
13731 1212 : opclasses[i] = indclass->values[i];
13732 1212 : *attnamelist = lappend(*attnamelist,
13733 1212 : makeString(pstrdup(NameStr(*attnumAttName(pkrel, pkattno)))));
13734 : }
13735 :
13736 896 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13737 :
13738 896 : ReleaseSysCache(indexTuple);
13739 :
13740 896 : return i;
13741 : }
13742 :
13743 : /*
13744 : * transformFkeyCheckAttrs -
13745 : *
13746 : * Validate that the 'attnums' columns in the 'pkrel' relation are valid to
13747 : * reference as part of a foreign key constraint.
13748 : *
13749 : * Returns the OID of the unique index supporting the constraint and
13750 : * populates the caller-provided 'opclasses' array with the opclasses
13751 : * associated with the index columns. Also sets whether the index
13752 : * uses WITHOUT OVERLAPS.
13753 : *
13754 : * Raises an ERROR on validation failure.
13755 : */
13756 : static Oid
13757 849 : transformFkeyCheckAttrs(Relation pkrel,
13758 : int numattrs, int16 *attnums,
13759 : bool with_period, Oid *opclasses,
13760 : bool *pk_has_without_overlaps)
13761 : {
13762 849 : Oid indexoid = InvalidOid;
13763 849 : bool found = false;
13764 849 : bool found_deferrable = false;
13765 : List *indexoidlist;
13766 : ListCell *indexoidscan;
13767 : int i,
13768 : j;
13769 :
13770 : /*
13771 : * Reject duplicate appearances of columns in the referenced-columns list.
13772 : * Such a case is forbidden by the SQL standard, and even if we thought it
13773 : * useful to allow it, there would be ambiguity about how to match the
13774 : * list to unique indexes (in particular, it'd be unclear which index
13775 : * opclass goes with which FK column).
13776 : */
13777 1991 : for (i = 0; i < numattrs; i++)
13778 : {
13779 1517 : for (j = i + 1; j < numattrs; j++)
13780 : {
13781 375 : if (attnums[i] == attnums[j])
13782 16 : ereport(ERROR,
13783 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13784 : errmsg("foreign key referenced-columns list must not contain duplicates")));
13785 : }
13786 : }
13787 :
13788 : /*
13789 : * Get the list of index OIDs for the table from the relcache, and look up
13790 : * each one in the pg_index syscache, and match unique indexes to the list
13791 : * of attnums we are given.
13792 : */
13793 833 : indexoidlist = RelationGetIndexList(pkrel);
13794 :
13795 952 : foreach(indexoidscan, indexoidlist)
13796 : {
13797 : HeapTuple indexTuple;
13798 : Form_pg_index indexStruct;
13799 :
13800 944 : indexoid = lfirst_oid(indexoidscan);
13801 944 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13802 944 : if (!HeapTupleIsValid(indexTuple))
13803 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13804 944 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13805 :
13806 : /*
13807 : * Must have the right number of columns; must be unique (or if
13808 : * temporal then exclusion instead) and not a partial index; forget it
13809 : * if there are any expressions, too. Invalid indexes are out as well.
13810 : */
13811 944 : if (indexStruct->indnkeyatts == numattrs &&
13812 863 : (with_period ? indexStruct->indisexclusion : indexStruct->indisunique) &&
13813 1726 : indexStruct->indisvalid &&
13814 1726 : heap_attisnull(indexTuple, Anum_pg_index_indpred, NULL) &&
13815 863 : heap_attisnull(indexTuple, Anum_pg_index_indexprs, NULL))
13816 : {
13817 : Datum indclassDatum;
13818 : oidvector *indclass;
13819 :
13820 : /* Must get indclass the hard way */
13821 863 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13822 : Anum_pg_index_indclass);
13823 863 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13824 :
13825 : /*
13826 : * The given attnum list may match the index columns in any order.
13827 : * Check for a match, and extract the appropriate opclasses while
13828 : * we're at it.
13829 : *
13830 : * We know that attnums[] is duplicate-free per the test at the
13831 : * start of this function, and we checked above that the number of
13832 : * index columns agrees, so if we find a match for each attnums[]
13833 : * entry then we must have a one-to-one match in some order.
13834 : */
13835 1997 : for (i = 0; i < numattrs; i++)
13836 : {
13837 1172 : found = false;
13838 1569 : for (j = 0; j < numattrs; j++)
13839 : {
13840 1531 : if (attnums[i] == indexStruct->indkey.values[j])
13841 : {
13842 1134 : opclasses[i] = indclass->values[j];
13843 1134 : found = true;
13844 1134 : break;
13845 : }
13846 : }
13847 1172 : if (!found)
13848 38 : break;
13849 : }
13850 : /* The last attribute in the index must be the PERIOD FK part */
13851 863 : if (found && with_period)
13852 : {
13853 80 : int16 periodattnum = attnums[numattrs - 1];
13854 :
13855 80 : found = (periodattnum == indexStruct->indkey.values[numattrs - 1]);
13856 : }
13857 :
13858 : /*
13859 : * Refuse to use a deferrable unique/primary key. This is per SQL
13860 : * spec, and there would be a lot of interesting semantic problems
13861 : * if we tried to allow it.
13862 : */
13863 863 : if (found && !indexStruct->indimmediate)
13864 : {
13865 : /*
13866 : * Remember that we found an otherwise matching index, so that
13867 : * we can generate a more appropriate error message.
13868 : */
13869 0 : found_deferrable = true;
13870 0 : found = false;
13871 : }
13872 :
13873 : /* We need to know whether the index has WITHOUT OVERLAPS */
13874 863 : if (found)
13875 825 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13876 : }
13877 944 : ReleaseSysCache(indexTuple);
13878 944 : if (found)
13879 825 : break;
13880 : }
13881 :
13882 833 : if (!found)
13883 : {
13884 8 : if (found_deferrable)
13885 0 : ereport(ERROR,
13886 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13887 : errmsg("cannot use a deferrable unique constraint for referenced table \"%s\"",
13888 : RelationGetRelationName(pkrel))));
13889 : else
13890 8 : ereport(ERROR,
13891 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13892 : errmsg("there is no unique constraint matching given keys for referenced table \"%s\"",
13893 : RelationGetRelationName(pkrel))));
13894 : }
13895 :
13896 825 : list_free(indexoidlist);
13897 :
13898 825 : return indexoid;
13899 : }
13900 :
13901 : /*
13902 : * findFkeyCast -
13903 : *
13904 : * Wrapper around find_coercion_pathway() for ATAddForeignKeyConstraint().
13905 : * Caller has equal regard for binary coercibility and for an exact match.
13906 : */
13907 : static CoercionPathType
13908 8 : findFkeyCast(Oid targetTypeId, Oid sourceTypeId, Oid *funcid)
13909 : {
13910 : CoercionPathType ret;
13911 :
13912 8 : if (targetTypeId == sourceTypeId)
13913 : {
13914 8 : ret = COERCION_PATH_RELABELTYPE;
13915 8 : *funcid = InvalidOid;
13916 : }
13917 : else
13918 : {
13919 0 : ret = find_coercion_pathway(targetTypeId, sourceTypeId,
13920 : COERCION_IMPLICIT, funcid);
13921 0 : if (ret == COERCION_PATH_NONE)
13922 : /* A previously-relied-upon cast is now gone. */
13923 0 : elog(ERROR, "could not find cast from %u to %u",
13924 : sourceTypeId, targetTypeId);
13925 : }
13926 :
13927 8 : return ret;
13928 : }
13929 :
13930 : /*
13931 : * Permissions checks on the referenced table for ADD FOREIGN KEY
13932 : *
13933 : * Note: we have already checked that the user owns the referencing table,
13934 : * else we'd have failed much earlier; no additional checks are needed for it.
13935 : */
13936 : static void
13937 1697 : checkFkeyPermissions(Relation rel, int16 *attnums, int natts)
13938 : {
13939 1697 : Oid roleid = GetUserId();
13940 : AclResult aclresult;
13941 : int i;
13942 :
13943 : /* Okay if we have relation-level REFERENCES permission */
13944 1697 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), roleid,
13945 : ACL_REFERENCES);
13946 1697 : if (aclresult == ACLCHECK_OK)
13947 1697 : return;
13948 : /* Else we must have REFERENCES on each column */
13949 0 : for (i = 0; i < natts; i++)
13950 : {
13951 0 : aclresult = pg_attribute_aclcheck(RelationGetRelid(rel), attnums[i],
13952 : roleid, ACL_REFERENCES);
13953 0 : if (aclresult != ACLCHECK_OK)
13954 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
13955 0 : RelationGetRelationName(rel));
13956 : }
13957 : }
13958 :
13959 : /*
13960 : * Scan the existing rows in a table to verify they meet a proposed FK
13961 : * constraint.
13962 : *
13963 : * Caller must have opened and locked both relations appropriately.
13964 : */
13965 : static void
13966 828 : validateForeignKeyConstraint(char *conname,
13967 : Relation rel,
13968 : Relation pkrel,
13969 : Oid pkindOid,
13970 : Oid constraintOid,
13971 : bool hasperiod)
13972 : {
13973 : TupleTableSlot *slot;
13974 : TableScanDesc scan;
13975 828 : Trigger trig = {0};
13976 : Snapshot snapshot;
13977 : MemoryContext oldcxt;
13978 : MemoryContext perTupCxt;
13979 :
13980 828 : ereport(DEBUG1,
13981 : (errmsg_internal("validating foreign key constraint \"%s\"", conname)));
13982 :
13983 : /*
13984 : * Build a trigger call structure; we'll need it either way.
13985 : */
13986 828 : trig.tgoid = InvalidOid;
13987 828 : trig.tgname = conname;
13988 828 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
13989 828 : trig.tgisinternal = true;
13990 828 : trig.tgconstrrelid = RelationGetRelid(pkrel);
13991 828 : trig.tgconstrindid = pkindOid;
13992 828 : trig.tgconstraint = constraintOid;
13993 828 : trig.tgdeferrable = false;
13994 828 : trig.tginitdeferred = false;
13995 : /* we needn't fill in remaining fields */
13996 :
13997 : /*
13998 : * See if we can do it with a single LEFT JOIN query. A false result
13999 : * indicates we must proceed with the fire-the-trigger method. We can't do
14000 : * a LEFT JOIN for temporal FKs yet, but we can once we support temporal
14001 : * left joins.
14002 : */
14003 828 : if (!hasperiod && RI_Initial_Check(&trig, rel, pkrel))
14004 698 : return;
14005 :
14006 : /*
14007 : * Scan through each tuple, calling RI_FKey_check_ins (insert trigger) as
14008 : * if that tuple had just been inserted. If any of those fail, it should
14009 : * ereport(ERROR) and that's that.
14010 : */
14011 71 : snapshot = RegisterSnapshot(GetLatestSnapshot());
14012 71 : slot = table_slot_create(rel, NULL);
14013 71 : scan = table_beginscan(rel, snapshot, 0, NULL,
14014 : SO_NONE);
14015 71 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
14016 : "validateForeignKeyConstraint",
14017 : ALLOCSET_SMALL_SIZES);
14018 71 : oldcxt = MemoryContextSwitchTo(perTupCxt);
14019 :
14020 127 : while (table_scan_getnextslot(scan, ForwardScanDirection, slot))
14021 : {
14022 68 : LOCAL_FCINFO(fcinfo, 0);
14023 68 : TriggerData trigdata = {0};
14024 :
14025 68 : CHECK_FOR_INTERRUPTS();
14026 :
14027 : /*
14028 : * Make a call to the trigger function
14029 : *
14030 : * No parameters are passed, but we do set a context
14031 : */
14032 340 : MemSet(fcinfo, 0, SizeForFunctionCallInfo(0));
14033 :
14034 : /*
14035 : * We assume RI_FKey_check_ins won't look at flinfo...
14036 : */
14037 68 : trigdata.type = T_TriggerData;
14038 68 : trigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
14039 68 : trigdata.tg_relation = rel;
14040 68 : trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, false, NULL);
14041 68 : trigdata.tg_trigslot = slot;
14042 68 : trigdata.tg_trigger = &trig;
14043 :
14044 68 : fcinfo->context = (Node *) &trigdata;
14045 :
14046 68 : RI_FKey_check_ins(fcinfo);
14047 :
14048 56 : MemoryContextReset(perTupCxt);
14049 : }
14050 :
14051 59 : MemoryContextSwitchTo(oldcxt);
14052 59 : MemoryContextDelete(perTupCxt);
14053 59 : table_endscan(scan);
14054 59 : UnregisterSnapshot(snapshot);
14055 59 : ExecDropSingleTupleTableSlot(slot);
14056 : }
14057 :
14058 : /*
14059 : * CreateFKCheckTrigger
14060 : * Creates the insert (on_insert=true) or update "check" trigger that
14061 : * implements a given foreign key
14062 : *
14063 : * Returns the OID of the so created trigger.
14064 : */
14065 : static Oid
14066 4112 : CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
14067 : Oid constraintOid, Oid indexOid, Oid parentTrigOid,
14068 : bool on_insert)
14069 : {
14070 : ObjectAddress trigAddress;
14071 : CreateTrigStmt *fk_trigger;
14072 :
14073 : /*
14074 : * Note: for a self-referential FK (referencing and referenced tables are
14075 : * the same), it is important that the ON UPDATE action fires before the
14076 : * CHECK action, since both triggers will fire on the same row during an
14077 : * UPDATE event; otherwise the CHECK trigger will be checking a non-final
14078 : * state of the row. Triggers fire in name order, so we ensure this by
14079 : * using names like "RI_ConstraintTrigger_a_NNNN" for the action triggers
14080 : * and "RI_ConstraintTrigger_c_NNNN" for the check triggers.
14081 : */
14082 4112 : fk_trigger = makeNode(CreateTrigStmt);
14083 4112 : fk_trigger->replace = false;
14084 4112 : fk_trigger->isconstraint = true;
14085 4112 : fk_trigger->trigname = "RI_ConstraintTrigger_c";
14086 4112 : fk_trigger->relation = NULL;
14087 :
14088 : /* Either ON INSERT or ON UPDATE */
14089 4112 : if (on_insert)
14090 : {
14091 2056 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
14092 2056 : fk_trigger->events = TRIGGER_TYPE_INSERT;
14093 : }
14094 : else
14095 : {
14096 2056 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
14097 2056 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
14098 : }
14099 :
14100 4112 : fk_trigger->args = NIL;
14101 4112 : fk_trigger->row = true;
14102 4112 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14103 4112 : fk_trigger->columns = NIL;
14104 4112 : fk_trigger->whenClause = NULL;
14105 4112 : fk_trigger->transitionRels = NIL;
14106 4112 : fk_trigger->deferrable = fkconstraint->deferrable;
14107 4112 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14108 4112 : fk_trigger->constrrel = NULL;
14109 :
14110 4112 : trigAddress = CreateTrigger(fk_trigger, NULL, myRelOid, refRelOid,
14111 : constraintOid, indexOid, InvalidOid,
14112 : parentTrigOid, NULL, true, false);
14113 :
14114 : /* Make changes-so-far visible */
14115 4112 : CommandCounterIncrement();
14116 :
14117 4112 : return trigAddress.objectId;
14118 : }
14119 :
14120 : /*
14121 : * createForeignKeyActionTriggers
14122 : * Create the referenced-side "action" triggers that implement a foreign
14123 : * key.
14124 : *
14125 : * Returns the OIDs of the so created triggers in *deleteTrigOid and
14126 : * *updateTrigOid.
14127 : */
14128 : static void
14129 2343 : createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
14130 : Oid constraintOid, Oid indexOid,
14131 : Oid parentDelTrigger, Oid parentUpdTrigger,
14132 : Oid *deleteTrigOid, Oid *updateTrigOid)
14133 : {
14134 : CreateTrigStmt *fk_trigger;
14135 : ObjectAddress trigAddress;
14136 :
14137 : /*
14138 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
14139 : * DELETE action on the referenced table.
14140 : */
14141 2343 : fk_trigger = makeNode(CreateTrigStmt);
14142 2343 : fk_trigger->replace = false;
14143 2343 : fk_trigger->isconstraint = true;
14144 2343 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
14145 2343 : fk_trigger->relation = NULL;
14146 2343 : fk_trigger->args = NIL;
14147 2343 : fk_trigger->row = true;
14148 2343 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14149 2343 : fk_trigger->events = TRIGGER_TYPE_DELETE;
14150 2343 : fk_trigger->columns = NIL;
14151 2343 : fk_trigger->whenClause = NULL;
14152 2343 : fk_trigger->transitionRels = NIL;
14153 2343 : fk_trigger->constrrel = NULL;
14154 :
14155 2343 : switch (fkconstraint->fk_del_action)
14156 : {
14157 1914 : case FKCONSTR_ACTION_NOACTION:
14158 1914 : fk_trigger->deferrable = fkconstraint->deferrable;
14159 1914 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14160 1914 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_del");
14161 1914 : break;
14162 20 : case FKCONSTR_ACTION_RESTRICT:
14163 20 : fk_trigger->deferrable = false;
14164 20 : fk_trigger->initdeferred = false;
14165 20 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_del");
14166 20 : break;
14167 306 : case FKCONSTR_ACTION_CASCADE:
14168 306 : fk_trigger->deferrable = false;
14169 306 : fk_trigger->initdeferred = false;
14170 306 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_del");
14171 306 : break;
14172 63 : case FKCONSTR_ACTION_SETNULL:
14173 63 : fk_trigger->deferrable = false;
14174 63 : fk_trigger->initdeferred = false;
14175 63 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_del");
14176 63 : break;
14177 40 : case FKCONSTR_ACTION_SETDEFAULT:
14178 40 : fk_trigger->deferrable = false;
14179 40 : fk_trigger->initdeferred = false;
14180 40 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_del");
14181 40 : break;
14182 0 : default:
14183 0 : elog(ERROR, "unrecognized FK action type: %d",
14184 : (int) fkconstraint->fk_del_action);
14185 : break;
14186 : }
14187 :
14188 2343 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
14189 : constraintOid, indexOid, InvalidOid,
14190 : parentDelTrigger, NULL, true, false);
14191 2343 : if (deleteTrigOid)
14192 2343 : *deleteTrigOid = trigAddress.objectId;
14193 :
14194 : /* Make changes-so-far visible */
14195 2343 : CommandCounterIncrement();
14196 :
14197 : /*
14198 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
14199 : * UPDATE action on the referenced table.
14200 : */
14201 2343 : fk_trigger = makeNode(CreateTrigStmt);
14202 2343 : fk_trigger->replace = false;
14203 2343 : fk_trigger->isconstraint = true;
14204 2343 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
14205 2343 : fk_trigger->relation = NULL;
14206 2343 : fk_trigger->args = NIL;
14207 2343 : fk_trigger->row = true;
14208 2343 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14209 2343 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
14210 2343 : fk_trigger->columns = NIL;
14211 2343 : fk_trigger->whenClause = NULL;
14212 2343 : fk_trigger->transitionRels = NIL;
14213 2343 : fk_trigger->constrrel = NULL;
14214 :
14215 2343 : switch (fkconstraint->fk_upd_action)
14216 : {
14217 2039 : case FKCONSTR_ACTION_NOACTION:
14218 2039 : fk_trigger->deferrable = fkconstraint->deferrable;
14219 2039 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14220 2039 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_upd");
14221 2039 : break;
14222 24 : case FKCONSTR_ACTION_RESTRICT:
14223 24 : fk_trigger->deferrable = false;
14224 24 : fk_trigger->initdeferred = false;
14225 24 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_upd");
14226 24 : break;
14227 211 : case FKCONSTR_ACTION_CASCADE:
14228 211 : fk_trigger->deferrable = false;
14229 211 : fk_trigger->initdeferred = false;
14230 211 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_upd");
14231 211 : break;
14232 41 : case FKCONSTR_ACTION_SETNULL:
14233 41 : fk_trigger->deferrable = false;
14234 41 : fk_trigger->initdeferred = false;
14235 41 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_upd");
14236 41 : break;
14237 28 : case FKCONSTR_ACTION_SETDEFAULT:
14238 28 : fk_trigger->deferrable = false;
14239 28 : fk_trigger->initdeferred = false;
14240 28 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_upd");
14241 28 : break;
14242 0 : default:
14243 0 : elog(ERROR, "unrecognized FK action type: %d",
14244 : (int) fkconstraint->fk_upd_action);
14245 : break;
14246 : }
14247 :
14248 2343 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
14249 : constraintOid, indexOid, InvalidOid,
14250 : parentUpdTrigger, NULL, true, false);
14251 2343 : if (updateTrigOid)
14252 2343 : *updateTrigOid = trigAddress.objectId;
14253 2343 : }
14254 :
14255 : /*
14256 : * createForeignKeyCheckTriggers
14257 : * Create the referencing-side "check" triggers that implement a foreign
14258 : * key.
14259 : *
14260 : * Returns the OIDs of the so created triggers in *insertTrigOid and
14261 : * *updateTrigOid.
14262 : */
14263 : static void
14264 2056 : createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
14265 : Constraint *fkconstraint, Oid constraintOid,
14266 : Oid indexOid,
14267 : Oid parentInsTrigger, Oid parentUpdTrigger,
14268 : Oid *insertTrigOid, Oid *updateTrigOid)
14269 : {
14270 2056 : *insertTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
14271 : constraintOid, indexOid,
14272 : parentInsTrigger, true);
14273 2056 : *updateTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
14274 : constraintOid, indexOid,
14275 : parentUpdTrigger, false);
14276 2056 : }
14277 :
14278 : /*
14279 : * ALTER TABLE DROP CONSTRAINT
14280 : *
14281 : * Like DROP COLUMN, we can't use the normal ALTER TABLE recursion mechanism.
14282 : */
14283 : static void
14284 577 : ATExecDropConstraint(Relation rel, const char *constrName,
14285 : DropBehavior behavior, bool recurse,
14286 : bool missing_ok, LOCKMODE lockmode)
14287 : {
14288 : Relation conrel;
14289 : SysScanDesc scan;
14290 : ScanKeyData skey[3];
14291 : HeapTuple tuple;
14292 577 : bool found = false;
14293 :
14294 577 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14295 :
14296 : /*
14297 : * Find and drop the target constraint
14298 : */
14299 577 : ScanKeyInit(&skey[0],
14300 : Anum_pg_constraint_conrelid,
14301 : BTEqualStrategyNumber, F_OIDEQ,
14302 : ObjectIdGetDatum(RelationGetRelid(rel)));
14303 577 : ScanKeyInit(&skey[1],
14304 : Anum_pg_constraint_contypid,
14305 : BTEqualStrategyNumber, F_OIDEQ,
14306 : ObjectIdGetDatum(InvalidOid));
14307 577 : ScanKeyInit(&skey[2],
14308 : Anum_pg_constraint_conname,
14309 : BTEqualStrategyNumber, F_NAMEEQ,
14310 : CStringGetDatum(constrName));
14311 577 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14312 : true, NULL, 3, skey);
14313 :
14314 : /* There can be at most one matching row */
14315 577 : if (HeapTupleIsValid(tuple = systable_getnext(scan)))
14316 : {
14317 553 : dropconstraint_internal(rel, tuple, behavior, recurse, false,
14318 : missing_ok, lockmode);
14319 429 : found = true;
14320 : }
14321 :
14322 453 : systable_endscan(scan);
14323 :
14324 453 : if (!found)
14325 : {
14326 24 : if (!missing_ok)
14327 16 : ereport(ERROR,
14328 : errcode(ERRCODE_UNDEFINED_OBJECT),
14329 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14330 : constrName, RelationGetRelationName(rel)));
14331 : else
14332 8 : ereport(NOTICE,
14333 : errmsg("constraint \"%s\" of relation \"%s\" does not exist, skipping",
14334 : constrName, RelationGetRelationName(rel)));
14335 : }
14336 :
14337 437 : table_close(conrel, RowExclusiveLock);
14338 437 : }
14339 :
14340 : /*
14341 : * Remove a constraint, using its pg_constraint tuple
14342 : *
14343 : * Implementation for ALTER TABLE DROP CONSTRAINT and ALTER TABLE ALTER COLUMN
14344 : * DROP NOT NULL.
14345 : *
14346 : * Returns the address of the constraint being removed.
14347 : */
14348 : static ObjectAddress
14349 857 : dropconstraint_internal(Relation rel, HeapTuple constraintTup, DropBehavior behavior,
14350 : bool recurse, bool recursing, bool missing_ok,
14351 : LOCKMODE lockmode)
14352 : {
14353 : Relation conrel;
14354 : Form_pg_constraint con;
14355 : ObjectAddress conobj;
14356 : List *children;
14357 857 : bool is_no_inherit_constraint = false;
14358 : char *constrName;
14359 857 : char *colname = NULL;
14360 :
14361 : /* Guard against stack overflow due to overly deep inheritance tree. */
14362 857 : check_stack_depth();
14363 :
14364 : /* At top level, permission check was done in ATPrepCmd, else do it */
14365 857 : if (recursing)
14366 159 : ATSimplePermissions(AT_DropConstraint, rel,
14367 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
14368 :
14369 853 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14370 :
14371 853 : con = (Form_pg_constraint) GETSTRUCT(constraintTup);
14372 853 : constrName = NameStr(con->conname);
14373 :
14374 : /* Don't allow drop of inherited constraints */
14375 853 : if (con->coninhcount > 0 && !recursing)
14376 104 : ereport(ERROR,
14377 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14378 : errmsg("cannot drop inherited constraint \"%s\" of relation \"%s\"",
14379 : constrName, RelationGetRelationName(rel))));
14380 :
14381 : /*
14382 : * Reset pg_constraint.attnotnull, if this is a not-null constraint.
14383 : *
14384 : * While doing that, we're in a good position to disallow dropping a not-
14385 : * null constraint underneath a primary key, a replica identity index, or
14386 : * a generated identity column.
14387 : */
14388 749 : if (con->contype == CONSTRAINT_NOTNULL)
14389 : {
14390 207 : Relation attrel = table_open(AttributeRelationId, RowExclusiveLock);
14391 207 : AttrNumber attnum = extractNotNullColumn(constraintTup);
14392 : Bitmapset *pkattrs;
14393 : Bitmapset *irattrs;
14394 : HeapTuple atttup;
14395 : Form_pg_attribute attForm;
14396 :
14397 : /* save column name for recursion step */
14398 207 : colname = get_attname(RelationGetRelid(rel), attnum, false);
14399 :
14400 : /*
14401 : * Disallow if it's in the primary key. For partitioned tables we
14402 : * cannot rely solely on RelationGetIndexAttrBitmap, because it'll
14403 : * return NULL if the primary key is invalid; but we still need to
14404 : * protect not-null constraints under such a constraint, so check the
14405 : * slow way.
14406 : */
14407 207 : pkattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_PRIMARY_KEY);
14408 :
14409 207 : if (pkattrs == NULL &&
14410 187 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14411 : {
14412 12 : Oid pkindex = RelationGetPrimaryKeyIndex(rel, true);
14413 :
14414 12 : if (OidIsValid(pkindex))
14415 : {
14416 0 : Relation pk = relation_open(pkindex, AccessShareLock);
14417 :
14418 0 : pkattrs = NULL;
14419 0 : for (int i = 0; i < pk->rd_index->indnkeyatts; i++)
14420 0 : pkattrs = bms_add_member(pkattrs, pk->rd_index->indkey.values[i]);
14421 :
14422 0 : relation_close(pk, AccessShareLock);
14423 : }
14424 : }
14425 :
14426 227 : if (pkattrs &&
14427 20 : bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, pkattrs))
14428 16 : ereport(ERROR,
14429 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14430 : errmsg("column \"%s\" is in a primary key",
14431 : get_attname(RelationGetRelid(rel), attnum, false)));
14432 :
14433 : /* Disallow if it's in the replica identity */
14434 191 : irattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_IDENTITY_KEY);
14435 191 : if (bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, irattrs))
14436 8 : ereport(ERROR,
14437 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14438 : errmsg("column \"%s\" is in index used as replica identity",
14439 : get_attname(RelationGetRelid(rel), attnum, false)));
14440 :
14441 : /* Disallow if it's a GENERATED AS IDENTITY column */
14442 183 : atttup = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
14443 183 : if (!HeapTupleIsValid(atttup))
14444 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
14445 : attnum, RelationGetRelid(rel));
14446 183 : attForm = (Form_pg_attribute) GETSTRUCT(atttup);
14447 183 : if (attForm->attidentity != '\0')
14448 0 : ereport(ERROR,
14449 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
14450 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
14451 : get_attname(RelationGetRelid(rel), attnum,
14452 : false),
14453 : RelationGetRelationName(rel)));
14454 :
14455 : /* All good -- reset attnotnull if needed */
14456 183 : if (attForm->attnotnull)
14457 : {
14458 183 : attForm->attnotnull = false;
14459 183 : CatalogTupleUpdate(attrel, &atttup->t_self, atttup);
14460 : }
14461 :
14462 183 : table_close(attrel, RowExclusiveLock);
14463 : }
14464 :
14465 725 : is_no_inherit_constraint = con->connoinherit;
14466 :
14467 : /*
14468 : * If it's a foreign-key constraint, we'd better lock the referenced table
14469 : * and check that that's not in use, just as we've already done for the
14470 : * constrained table (else we might, eg, be dropping a trigger that has
14471 : * unfired events). But we can/must skip that in the self-referential
14472 : * case.
14473 : */
14474 725 : if (con->contype == CONSTRAINT_FOREIGN &&
14475 112 : con->confrelid != RelationGetRelid(rel))
14476 : {
14477 : Relation frel;
14478 :
14479 : /* Must match lock taken by RemoveTriggerById: */
14480 112 : frel = table_open(con->confrelid, AccessExclusiveLock);
14481 112 : CheckAlterTableIsSafe(frel);
14482 108 : table_close(frel, NoLock);
14483 : }
14484 :
14485 : /*
14486 : * Perform the actual constraint deletion
14487 : */
14488 721 : ObjectAddressSet(conobj, ConstraintRelationId, con->oid);
14489 721 : performDeletion(&conobj, behavior, 0);
14490 :
14491 : /*
14492 : * For partitioned tables, non-CHECK, non-NOT-NULL inherited constraints
14493 : * are dropped via the dependency mechanism, so we're done here.
14494 : */
14495 697 : if (con->contype != CONSTRAINT_CHECK &&
14496 420 : con->contype != CONSTRAINT_NOTNULL &&
14497 237 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14498 : {
14499 52 : table_close(conrel, RowExclusiveLock);
14500 52 : return conobj;
14501 : }
14502 :
14503 : /*
14504 : * Propagate to children as appropriate. Unlike most other ALTER
14505 : * routines, we have to do this one level of recursion at a time; we can't
14506 : * use find_all_inheritors to do it in one pass.
14507 : */
14508 645 : if (!is_no_inherit_constraint)
14509 452 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
14510 : else
14511 193 : children = NIL;
14512 :
14513 1565 : foreach_oid(childrelid, children)
14514 : {
14515 : Relation childrel;
14516 : HeapTuple tuple;
14517 : Form_pg_constraint childcon;
14518 :
14519 : /* find_inheritance_children already got lock */
14520 283 : childrel = table_open(childrelid, NoLock);
14521 283 : CheckAlterTableIsSafe(childrel);
14522 :
14523 : /*
14524 : * We search for not-null constraints by column name, and others by
14525 : * constraint name.
14526 : */
14527 283 : if (con->contype == CONSTRAINT_NOTNULL)
14528 : {
14529 98 : tuple = findNotNullConstraint(childrelid, colname);
14530 98 : if (!HeapTupleIsValid(tuple))
14531 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
14532 : colname, RelationGetRelid(childrel));
14533 : }
14534 : else
14535 : {
14536 : SysScanDesc scan;
14537 : ScanKeyData skey[3];
14538 :
14539 185 : ScanKeyInit(&skey[0],
14540 : Anum_pg_constraint_conrelid,
14541 : BTEqualStrategyNumber, F_OIDEQ,
14542 : ObjectIdGetDatum(childrelid));
14543 185 : ScanKeyInit(&skey[1],
14544 : Anum_pg_constraint_contypid,
14545 : BTEqualStrategyNumber, F_OIDEQ,
14546 : ObjectIdGetDatum(InvalidOid));
14547 185 : ScanKeyInit(&skey[2],
14548 : Anum_pg_constraint_conname,
14549 : BTEqualStrategyNumber, F_NAMEEQ,
14550 : CStringGetDatum(constrName));
14551 185 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14552 : true, NULL, 3, skey);
14553 : /* There can only be one, so no need to loop */
14554 185 : tuple = systable_getnext(scan);
14555 185 : if (!HeapTupleIsValid(tuple))
14556 0 : ereport(ERROR,
14557 : (errcode(ERRCODE_UNDEFINED_OBJECT),
14558 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14559 : constrName,
14560 : RelationGetRelationName(childrel))));
14561 185 : tuple = heap_copytuple(tuple);
14562 185 : systable_endscan(scan);
14563 : }
14564 :
14565 283 : childcon = (Form_pg_constraint) GETSTRUCT(tuple);
14566 :
14567 : /* Right now only CHECK and not-null constraints can be inherited */
14568 283 : if (childcon->contype != CONSTRAINT_CHECK &&
14569 98 : childcon->contype != CONSTRAINT_NOTNULL)
14570 0 : elog(ERROR, "inherited constraint is not a CHECK or not-null constraint");
14571 :
14572 283 : if (childcon->coninhcount <= 0) /* shouldn't happen */
14573 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
14574 : childrelid, NameStr(childcon->conname));
14575 :
14576 283 : if (recurse)
14577 : {
14578 : /*
14579 : * If the child constraint has other definition sources, just
14580 : * decrement its inheritance count; if not, recurse to delete it.
14581 : */
14582 215 : if (childcon->coninhcount == 1 && !childcon->conislocal)
14583 : {
14584 : /* Time to delete this child constraint, too */
14585 159 : dropconstraint_internal(childrel, tuple, behavior,
14586 : recurse, true, missing_ok,
14587 : lockmode);
14588 : }
14589 : else
14590 : {
14591 : /* Child constraint must survive my deletion */
14592 56 : childcon->coninhcount--;
14593 56 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14594 :
14595 : /* Make update visible */
14596 56 : CommandCounterIncrement();
14597 : }
14598 : }
14599 : else
14600 : {
14601 : /*
14602 : * If we were told to drop ONLY in this table (no recursion) and
14603 : * there are no further parents for this constraint, we need to
14604 : * mark the inheritors' constraints as locally defined rather than
14605 : * inherited.
14606 : */
14607 68 : childcon->coninhcount--;
14608 68 : if (childcon->coninhcount == 0)
14609 68 : childcon->conislocal = true;
14610 :
14611 68 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14612 :
14613 : /* Make update visible */
14614 68 : CommandCounterIncrement();
14615 : }
14616 :
14617 279 : heap_freetuple(tuple);
14618 :
14619 279 : table_close(childrel, NoLock);
14620 : }
14621 :
14622 641 : table_close(conrel, RowExclusiveLock);
14623 :
14624 641 : return conobj;
14625 : }
14626 :
14627 : /*
14628 : * ALTER COLUMN TYPE
14629 : *
14630 : * Unlike other subcommand types, we do parse transformation for ALTER COLUMN
14631 : * TYPE during phase 1 --- the AlterTableCmd passed in here is already
14632 : * transformed (and must be, because we rely on some transformed fields).
14633 : *
14634 : * The point of this is that the execution of all ALTER COLUMN TYPEs for a
14635 : * table will be done "in parallel" during phase 3, so all the USING
14636 : * expressions should be parsed assuming the original column types. Also,
14637 : * this allows a USING expression to refer to a field that will be dropped.
14638 : *
14639 : * To make this work safely, AT_PASS_DROP then AT_PASS_ALTER_TYPE must be
14640 : * the first two execution steps in phase 2; they must not see the effects
14641 : * of any other subcommand types, since the USING expressions are parsed
14642 : * against the unmodified table's state.
14643 : */
14644 : static void
14645 947 : ATPrepAlterColumnType(List **wqueue,
14646 : AlteredTableInfo *tab, Relation rel,
14647 : bool recurse, bool recursing,
14648 : AlterTableCmd *cmd, LOCKMODE lockmode,
14649 : AlterTableUtilityContext *context)
14650 : {
14651 947 : char *colName = cmd->name;
14652 947 : ColumnDef *def = (ColumnDef *) cmd->def;
14653 947 : TypeName *typeName = def->typeName;
14654 947 : Node *transform = def->cooked_default;
14655 : HeapTuple tuple;
14656 : Form_pg_attribute attTup;
14657 : AttrNumber attnum;
14658 : Oid targettype;
14659 : int32 targettypmod;
14660 : Oid targetcollid;
14661 : NewColumnValue *newval;
14662 947 : ParseState *pstate = make_parsestate(NULL);
14663 : AclResult aclresult;
14664 : bool is_expr;
14665 :
14666 947 : pstate->p_sourcetext = context->queryString;
14667 :
14668 947 : if (rel->rd_rel->reloftype && !recursing)
14669 4 : ereport(ERROR,
14670 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14671 : errmsg("cannot alter column type of typed table"),
14672 : parser_errposition(pstate, def->location)));
14673 :
14674 : /* lookup the attribute so we can check inheritance status */
14675 943 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
14676 943 : if (!HeapTupleIsValid(tuple))
14677 0 : ereport(ERROR,
14678 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14679 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14680 : colName, RelationGetRelationName(rel)),
14681 : parser_errposition(pstate, def->location)));
14682 943 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
14683 943 : attnum = attTup->attnum;
14684 :
14685 : /* Can't alter a system attribute */
14686 943 : if (attnum <= 0)
14687 4 : ereport(ERROR,
14688 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14689 : errmsg("cannot alter system column \"%s\"", colName),
14690 : parser_errposition(pstate, def->location)));
14691 :
14692 : /*
14693 : * Cannot specify USING when altering type of a generated column, because
14694 : * that would violate the generation expression.
14695 : */
14696 939 : if (attTup->attgenerated && def->cooked_default)
14697 8 : ereport(ERROR,
14698 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
14699 : errmsg("cannot specify USING when altering type of generated column"),
14700 : errdetail("Column \"%s\" is a generated column.", colName),
14701 : parser_errposition(pstate, def->location)));
14702 :
14703 : /*
14704 : * Don't alter inherited columns. At outer level, there had better not be
14705 : * any inherited definition; when recursing, we assume this was checked at
14706 : * the parent level (see below).
14707 : */
14708 931 : if (attTup->attinhcount > 0 && !recursing)
14709 4 : ereport(ERROR,
14710 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14711 : errmsg("cannot alter inherited column \"%s\"", colName),
14712 : parser_errposition(pstate, def->location)));
14713 :
14714 : /* Don't alter columns used in the partition key */
14715 927 : if (has_partition_attrs(rel,
14716 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
14717 : &is_expr))
14718 12 : ereport(ERROR,
14719 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14720 : errmsg("cannot alter column \"%s\" because it is part of the partition key of relation \"%s\"",
14721 : colName, RelationGetRelationName(rel)),
14722 : parser_errposition(pstate, def->location)));
14723 :
14724 : /* Look up the target type */
14725 915 : typenameTypeIdAndMod(pstate, typeName, &targettype, &targettypmod);
14726 :
14727 911 : aclresult = object_aclcheck(TypeRelationId, targettype, GetUserId(), ACL_USAGE);
14728 911 : if (aclresult != ACLCHECK_OK)
14729 8 : aclcheck_error_type(aclresult, targettype);
14730 :
14731 : /* And the collation */
14732 903 : targetcollid = GetColumnDefCollation(pstate, def, targettype);
14733 :
14734 : /* make sure datatype is legal for a column */
14735 1798 : CheckAttributeType(colName, targettype, targetcollid,
14736 899 : list_make1_oid(rel->rd_rel->reltype),
14737 899 : (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
14738 :
14739 891 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14740 : {
14741 : /* do nothing */
14742 : }
14743 867 : else if (tab->relkind == RELKIND_RELATION ||
14744 133 : tab->relkind == RELKIND_PARTITIONED_TABLE)
14745 : {
14746 : /*
14747 : * Set up an expression to transform the old data value to the new
14748 : * type. If a USING option was given, use the expression as
14749 : * transformed by transformAlterTableStmt, else just take the old
14750 : * value and try to coerce it. We do this first so that type
14751 : * incompatibility can be detected before we waste effort, and because
14752 : * we need the expression to be parsed against the original table row
14753 : * type.
14754 : */
14755 778 : if (!transform)
14756 : {
14757 627 : transform = (Node *) makeVar(1, attnum,
14758 : attTup->atttypid, attTup->atttypmod,
14759 : attTup->attcollation,
14760 : 0);
14761 : }
14762 :
14763 778 : transform = coerce_to_target_type(pstate,
14764 : transform, exprType(transform),
14765 : targettype, targettypmod,
14766 : COERCION_ASSIGNMENT,
14767 : COERCE_IMPLICIT_CAST,
14768 : -1);
14769 778 : if (transform == NULL)
14770 : {
14771 : /* error text depends on whether USING was specified or not */
14772 15 : if (def->cooked_default != NULL)
14773 4 : ereport(ERROR,
14774 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14775 : errmsg("result of USING clause for column \"%s\""
14776 : " cannot be cast automatically to type %s",
14777 : colName, format_type_be(targettype)),
14778 : errhint("You might need to add an explicit cast.")));
14779 : else
14780 11 : ereport(ERROR,
14781 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14782 : errmsg("column \"%s\" cannot be cast automatically to type %s",
14783 : colName, format_type_be(targettype)),
14784 : !attTup->attgenerated ?
14785 : /* translator: USING is SQL, don't translate it */
14786 : errhint("You might need to specify \"USING %s::%s\".",
14787 : quote_identifier(colName),
14788 : format_type_with_typemod(targettype,
14789 : targettypmod)) : 0));
14790 : }
14791 :
14792 : /* Fix collations after all else */
14793 763 : assign_expr_collations(pstate, transform);
14794 :
14795 : /* Expand virtual generated columns in the expr. */
14796 763 : transform = expand_generated_columns_in_expr(transform, rel, 1);
14797 :
14798 : /* Plan the expr now so we can accurately assess the need to rewrite. */
14799 763 : transform = (Node *) expression_planner((Expr *) transform);
14800 :
14801 : /*
14802 : * Add a work queue item to make ATRewriteTable update the column
14803 : * contents.
14804 : */
14805 763 : newval = palloc0_object(NewColumnValue);
14806 763 : newval->attnum = attnum;
14807 763 : newval->expr = (Expr *) transform;
14808 763 : newval->is_generated = false;
14809 :
14810 763 : tab->newvals = lappend(tab->newvals, newval);
14811 1394 : if (ATColumnChangeRequiresRewrite(transform, attnum))
14812 631 : tab->rewrite |= AT_REWRITE_COLUMN_REWRITE;
14813 : }
14814 89 : else if (transform)
14815 8 : ereport(ERROR,
14816 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14817 : errmsg("\"%s\" is not a table",
14818 : RelationGetRelationName(rel))));
14819 :
14820 868 : if (!RELKIND_HAS_STORAGE(tab->relkind) || attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14821 : {
14822 : /*
14823 : * For relations or columns without storage, do this check now.
14824 : * Regular tables will check it later when the table is being
14825 : * rewritten.
14826 : */
14827 149 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
14828 : }
14829 :
14830 836 : ReleaseSysCache(tuple);
14831 :
14832 : /*
14833 : * Recurse manually by queueing a new command for each child, if
14834 : * necessary. We cannot apply ATSimpleRecursion here because we need to
14835 : * remap attribute numbers in the USING expression, if any.
14836 : *
14837 : * If we are told not to recurse, there had better not be any child
14838 : * tables; else the alter would put them out of step.
14839 : */
14840 836 : if (recurse)
14841 : {
14842 665 : Oid relid = RelationGetRelid(rel);
14843 : List *child_oids,
14844 : *child_numparents;
14845 : ListCell *lo,
14846 : *li;
14847 :
14848 665 : child_oids = find_all_inheritors(relid, lockmode,
14849 : &child_numparents);
14850 :
14851 : /*
14852 : * find_all_inheritors does the recursive search of the inheritance
14853 : * hierarchy, so all we have to do is process all of the relids in the
14854 : * list that it returns.
14855 : */
14856 1468 : forboth(lo, child_oids, li, child_numparents)
14857 : {
14858 819 : Oid childrelid = lfirst_oid(lo);
14859 819 : int numparents = lfirst_int(li);
14860 : Relation childrel;
14861 : HeapTuple childtuple;
14862 : Form_pg_attribute childattTup;
14863 :
14864 819 : if (childrelid == relid)
14865 665 : continue;
14866 :
14867 : /* find_all_inheritors already got lock */
14868 154 : childrel = relation_open(childrelid, NoLock);
14869 154 : CheckAlterTableIsSafe(childrel);
14870 :
14871 : /*
14872 : * Verify that the child doesn't have any inherited definitions of
14873 : * this column that came from outside this inheritance hierarchy.
14874 : * (renameatt makes a similar test, though in a different way
14875 : * because of its different recursion mechanism.)
14876 : */
14877 154 : childtuple = SearchSysCacheAttName(RelationGetRelid(childrel),
14878 : colName);
14879 154 : if (!HeapTupleIsValid(childtuple))
14880 0 : ereport(ERROR,
14881 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14882 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14883 : colName, RelationGetRelationName(childrel))));
14884 154 : childattTup = (Form_pg_attribute) GETSTRUCT(childtuple);
14885 :
14886 154 : if (childattTup->attinhcount > numparents)
14887 4 : ereport(ERROR,
14888 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14889 : errmsg("cannot alter inherited column \"%s\" of relation \"%s\"",
14890 : colName, RelationGetRelationName(childrel))));
14891 :
14892 150 : ReleaseSysCache(childtuple);
14893 :
14894 : /*
14895 : * Remap the attribute numbers. If no USING expression was
14896 : * specified, there is no need for this step.
14897 : */
14898 150 : if (def->cooked_default)
14899 : {
14900 : AttrMap *attmap;
14901 : bool found_whole_row;
14902 :
14903 : /* create a copy to scribble on */
14904 52 : cmd = copyObject(cmd);
14905 :
14906 52 : attmap = build_attrmap_by_name(RelationGetDescr(childrel),
14907 : RelationGetDescr(rel),
14908 : false);
14909 104 : ((ColumnDef *) cmd->def)->cooked_default =
14910 52 : map_variable_attnos(def->cooked_default,
14911 : 1, 0,
14912 : attmap,
14913 : InvalidOid, &found_whole_row);
14914 52 : if (found_whole_row)
14915 4 : ereport(ERROR,
14916 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14917 : errmsg("cannot convert whole-row table reference"),
14918 : errdetail("USING expression contains a whole-row table reference.")));
14919 48 : pfree(attmap);
14920 : }
14921 146 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
14922 138 : relation_close(childrel, NoLock);
14923 : }
14924 : }
14925 204 : else if (!recursing &&
14926 33 : find_inheritance_children(RelationGetRelid(rel), NoLock) != NIL)
14927 0 : ereport(ERROR,
14928 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14929 : errmsg("type of inherited column \"%s\" must be changed in child tables too",
14930 : colName)));
14931 :
14932 820 : if (tab->relkind == RELKIND_COMPOSITE_TYPE)
14933 33 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
14934 816 : }
14935 :
14936 : /*
14937 : * When the data type of a column is changed, a rewrite might not be required
14938 : * if the new type is sufficiently identical to the old one, and the USING
14939 : * clause isn't trying to insert some other value. It's safe to skip the
14940 : * rewrite in these cases:
14941 : *
14942 : * - the old type is binary coercible to the new type
14943 : * - the new type is an unconstrained domain over the old type
14944 : * - {NEW,OLD} or {OLD,NEW} is {timestamptz,timestamp} and the timezone is UTC
14945 : *
14946 : * In the case of a constrained domain, we could get by with scanning the
14947 : * table and checking the constraint rather than actually rewriting it, but we
14948 : * don't currently try to do that.
14949 : */
14950 : static bool
14951 763 : ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno)
14952 : {
14953 : Assert(expr != NULL);
14954 :
14955 : for (;;)
14956 : {
14957 : /* only one varno, so no need to check that */
14958 839 : if (IsA(expr, Var) && ((Var *) expr)->varattno == varattno)
14959 132 : return false;
14960 707 : else if (IsA(expr, RelabelType))
14961 68 : expr = (Node *) ((RelabelType *) expr)->arg;
14962 639 : else if (IsA(expr, CoerceToDomain))
14963 : {
14964 4 : CoerceToDomain *d = (CoerceToDomain *) expr;
14965 :
14966 4 : if (DomainHasConstraints(d->resulttype, NULL))
14967 4 : return true;
14968 0 : expr = (Node *) d->arg;
14969 : }
14970 635 : else if (IsA(expr, FuncExpr))
14971 : {
14972 502 : FuncExpr *f = (FuncExpr *) expr;
14973 :
14974 502 : switch (f->funcid)
14975 : {
14976 12 : case F_TIMESTAMPTZ_TIMESTAMP:
14977 : case F_TIMESTAMP_TIMESTAMPTZ:
14978 12 : if (TimestampTimestampTzRequiresRewrite())
14979 4 : return true;
14980 : else
14981 8 : expr = linitial(f->args);
14982 8 : break;
14983 490 : default:
14984 490 : return true;
14985 : }
14986 : }
14987 : else
14988 133 : return true;
14989 : }
14990 : }
14991 :
14992 : /*
14993 : * ALTER COLUMN .. SET DATA TYPE
14994 : *
14995 : * Return the address of the modified column.
14996 : */
14997 : static ObjectAddress
14998 792 : ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
14999 : AlterTableCmd *cmd, LOCKMODE lockmode)
15000 : {
15001 792 : char *colName = cmd->name;
15002 792 : ColumnDef *def = (ColumnDef *) cmd->def;
15003 792 : TypeName *typeName = def->typeName;
15004 : HeapTuple heapTup;
15005 : Form_pg_attribute attTup,
15006 : attOldTup;
15007 : AttrNumber attnum;
15008 : HeapTuple typeTuple;
15009 : Form_pg_type tform;
15010 : Oid targettype;
15011 : int32 targettypmod;
15012 : Oid targetcollid;
15013 : Node *defaultexpr;
15014 : Relation attrelation;
15015 : Relation depRel;
15016 : ScanKeyData key[3];
15017 : SysScanDesc scan;
15018 : HeapTuple depTup;
15019 : ObjectAddress address;
15020 :
15021 : /*
15022 : * Clear all the missing values if we're rewriting the table, since this
15023 : * renders them pointless.
15024 : */
15025 792 : if (tab->rewrite)
15026 : {
15027 : Relation newrel;
15028 :
15029 591 : newrel = table_open(RelationGetRelid(rel), NoLock);
15030 591 : RelationClearMissing(newrel);
15031 591 : relation_close(newrel, NoLock);
15032 : /* make sure we don't conflict with later attribute modifications */
15033 591 : CommandCounterIncrement();
15034 : }
15035 :
15036 792 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
15037 :
15038 : /* Look up the target column */
15039 792 : heapTup = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
15040 792 : if (!HeapTupleIsValid(heapTup)) /* shouldn't happen */
15041 0 : ereport(ERROR,
15042 : (errcode(ERRCODE_UNDEFINED_COLUMN),
15043 : errmsg("column \"%s\" of relation \"%s\" does not exist",
15044 : colName, RelationGetRelationName(rel))));
15045 792 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
15046 792 : attnum = attTup->attnum;
15047 792 : attOldTup = TupleDescAttr(tab->oldDesc, attnum - 1);
15048 :
15049 : /* Check for multiple ALTER TYPE on same column --- can't cope */
15050 792 : if (attTup->atttypid != attOldTup->atttypid ||
15051 792 : attTup->atttypmod != attOldTup->atttypmod)
15052 0 : ereport(ERROR,
15053 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15054 : errmsg("cannot alter type of column \"%s\" twice",
15055 : colName)));
15056 :
15057 : /* Look up the target type (should not fail, since prep found it) */
15058 792 : typeTuple = typenameType(NULL, typeName, &targettypmod);
15059 792 : tform = (Form_pg_type) GETSTRUCT(typeTuple);
15060 792 : targettype = tform->oid;
15061 : /* And the collation */
15062 792 : targetcollid = GetColumnDefCollation(NULL, def, targettype);
15063 :
15064 : /*
15065 : * If there is a default expression for the column, get it and ensure we
15066 : * can coerce it to the new datatype. (We must do this before changing
15067 : * the column type, because build_column_default itself will try to
15068 : * coerce, and will not issue the error message we want if it fails.)
15069 : *
15070 : * We remove any implicit coercion steps at the top level of the old
15071 : * default expression; this has been agreed to satisfy the principle of
15072 : * least surprise. (The conversion to the new column type should act like
15073 : * it started from what the user sees as the stored expression, and the
15074 : * implicit coercions aren't going to be shown.)
15075 : */
15076 792 : if (attTup->atthasdef)
15077 : {
15078 64 : defaultexpr = build_column_default(rel, attnum);
15079 : Assert(defaultexpr);
15080 64 : defaultexpr = strip_implicit_coercions(defaultexpr);
15081 64 : defaultexpr = coerce_to_target_type(NULL, /* no UNKNOWN params */
15082 : defaultexpr, exprType(defaultexpr),
15083 : targettype, targettypmod,
15084 : COERCION_ASSIGNMENT,
15085 : COERCE_IMPLICIT_CAST,
15086 : -1);
15087 64 : if (defaultexpr == NULL)
15088 : {
15089 4 : if (attTup->attgenerated)
15090 0 : ereport(ERROR,
15091 : (errcode(ERRCODE_DATATYPE_MISMATCH),
15092 : errmsg("generation expression for column \"%s\" cannot be cast automatically to type %s",
15093 : colName, format_type_be(targettype))));
15094 : else
15095 4 : ereport(ERROR,
15096 : (errcode(ERRCODE_DATATYPE_MISMATCH),
15097 : errmsg("default for column \"%s\" cannot be cast automatically to type %s",
15098 : colName, format_type_be(targettype))));
15099 : }
15100 : }
15101 : else
15102 728 : defaultexpr = NULL;
15103 :
15104 : /*
15105 : * Find everything that depends on the column (constraints, indexes, etc),
15106 : * and record enough information to let us recreate the objects.
15107 : *
15108 : * The actual recreation does not happen here, but only after we have
15109 : * performed all the individual ALTER TYPE operations. We have to save
15110 : * the info before executing ALTER TYPE, though, else the deparser will
15111 : * get confused.
15112 : */
15113 788 : RememberAllDependentForRebuilding(tab, AT_AlterColumnType, rel, attnum, colName);
15114 :
15115 : /*
15116 : * Now scan for dependencies of this column on other things. The only
15117 : * things we should find are the dependency on the column datatype and
15118 : * possibly a collation dependency. Those can be removed.
15119 : */
15120 764 : depRel = table_open(DependRelationId, RowExclusiveLock);
15121 :
15122 764 : ScanKeyInit(&key[0],
15123 : Anum_pg_depend_classid,
15124 : BTEqualStrategyNumber, F_OIDEQ,
15125 : ObjectIdGetDatum(RelationRelationId));
15126 764 : ScanKeyInit(&key[1],
15127 : Anum_pg_depend_objid,
15128 : BTEqualStrategyNumber, F_OIDEQ,
15129 : ObjectIdGetDatum(RelationGetRelid(rel)));
15130 764 : ScanKeyInit(&key[2],
15131 : Anum_pg_depend_objsubid,
15132 : BTEqualStrategyNumber, F_INT4EQ,
15133 : Int32GetDatum((int32) attnum));
15134 :
15135 764 : scan = systable_beginscan(depRel, DependDependerIndexId, true,
15136 : NULL, 3, key);
15137 :
15138 766 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15139 : {
15140 2 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15141 : ObjectAddress foundObject;
15142 :
15143 2 : foundObject.classId = foundDep->refclassid;
15144 2 : foundObject.objectId = foundDep->refobjid;
15145 2 : foundObject.objectSubId = foundDep->refobjsubid;
15146 :
15147 2 : if (foundDep->deptype != DEPENDENCY_NORMAL)
15148 0 : elog(ERROR, "found unexpected dependency type '%c'",
15149 : foundDep->deptype);
15150 2 : if (!(foundDep->refclassid == TypeRelationId &&
15151 2 : foundDep->refobjid == attTup->atttypid) &&
15152 0 : !(foundDep->refclassid == CollationRelationId &&
15153 0 : foundDep->refobjid == attTup->attcollation))
15154 0 : elog(ERROR, "found unexpected dependency for column: %s",
15155 : getObjectDescription(&foundObject, false));
15156 :
15157 2 : CatalogTupleDelete(depRel, &depTup->t_self);
15158 : }
15159 :
15160 764 : systable_endscan(scan);
15161 :
15162 764 : table_close(depRel, RowExclusiveLock);
15163 :
15164 : /*
15165 : * Here we go --- change the recorded column type and collation. (Note
15166 : * heapTup is a copy of the syscache entry, so okay to scribble on.) First
15167 : * fix up the missing value if any.
15168 : */
15169 764 : if (attTup->atthasmissing)
15170 : {
15171 : Datum missingval;
15172 : bool missingNull;
15173 :
15174 : /* if rewrite is true the missing value should already be cleared */
15175 : Assert(tab->rewrite == 0);
15176 :
15177 : /* Get the missing value datum */
15178 4 : missingval = heap_getattr(heapTup,
15179 : Anum_pg_attribute_attmissingval,
15180 : attrelation->rd_att,
15181 : &missingNull);
15182 :
15183 : /* if it's a null array there is nothing to do */
15184 :
15185 4 : if (!missingNull)
15186 : {
15187 : /*
15188 : * Get the datum out of the array and repack it in a new array
15189 : * built with the new type data. We assume that since the table
15190 : * doesn't need rewriting, the actual Datum doesn't need to be
15191 : * changed, only the array metadata.
15192 : */
15193 :
15194 4 : int one = 1;
15195 : bool isNull;
15196 4 : Datum valuesAtt[Natts_pg_attribute] = {0};
15197 4 : bool nullsAtt[Natts_pg_attribute] = {0};
15198 4 : bool replacesAtt[Natts_pg_attribute] = {0};
15199 : HeapTuple newTup;
15200 :
15201 8 : missingval = array_get_element(missingval,
15202 : 1,
15203 : &one,
15204 : 0,
15205 4 : attTup->attlen,
15206 4 : attTup->attbyval,
15207 4 : attTup->attalign,
15208 : &isNull);
15209 4 : missingval = PointerGetDatum(construct_array(&missingval,
15210 : 1,
15211 : targettype,
15212 : tform->typlen,
15213 : tform->typbyval,
15214 : tform->typalign));
15215 :
15216 4 : valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
15217 4 : replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;
15218 4 : nullsAtt[Anum_pg_attribute_attmissingval - 1] = false;
15219 :
15220 4 : newTup = heap_modify_tuple(heapTup, RelationGetDescr(attrelation),
15221 : valuesAtt, nullsAtt, replacesAtt);
15222 4 : heap_freetuple(heapTup);
15223 4 : heapTup = newTup;
15224 4 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
15225 : }
15226 : }
15227 :
15228 764 : attTup->atttypid = targettype;
15229 764 : attTup->atttypmod = targettypmod;
15230 764 : attTup->attcollation = targetcollid;
15231 764 : if (list_length(typeName->arrayBounds) > PG_INT16_MAX)
15232 0 : ereport(ERROR,
15233 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
15234 : errmsg("too many array dimensions"));
15235 764 : attTup->attndims = list_length(typeName->arrayBounds);
15236 764 : attTup->attlen = tform->typlen;
15237 764 : attTup->attbyval = tform->typbyval;
15238 764 : attTup->attalign = tform->typalign;
15239 764 : attTup->attstorage = tform->typstorage;
15240 764 : attTup->attcompression = InvalidCompressionMethod;
15241 :
15242 764 : ReleaseSysCache(typeTuple);
15243 :
15244 764 : CatalogTupleUpdate(attrelation, &heapTup->t_self, heapTup);
15245 :
15246 764 : table_close(attrelation, RowExclusiveLock);
15247 :
15248 : /* Install dependencies on new datatype and collation */
15249 764 : add_column_datatype_dependency(RelationGetRelid(rel), attnum, targettype);
15250 764 : add_column_collation_dependency(RelationGetRelid(rel), attnum, targetcollid);
15251 :
15252 : /*
15253 : * Drop any pg_statistic entry for the column, since it's now wrong type
15254 : */
15255 764 : RemoveStatistics(RelationGetRelid(rel), attnum);
15256 :
15257 764 : InvokeObjectPostAlterHook(RelationRelationId,
15258 : RelationGetRelid(rel), attnum);
15259 :
15260 : /*
15261 : * Update the default, if present, by brute force --- remove and re-add
15262 : * the default. Probably unsafe to take shortcuts, since the new version
15263 : * may well have additional dependencies. (It's okay to do this now,
15264 : * rather than after other ALTER TYPE commands, since the default won't
15265 : * depend on other column types.)
15266 : */
15267 764 : if (defaultexpr)
15268 : {
15269 : /*
15270 : * If it's a GENERATED default, drop its dependency records, in
15271 : * particular its INTERNAL dependency on the column, which would
15272 : * otherwise cause dependency.c to refuse to perform the deletion.
15273 : */
15274 60 : if (attTup->attgenerated)
15275 : {
15276 28 : Oid attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
15277 :
15278 28 : if (!OidIsValid(attrdefoid))
15279 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
15280 : RelationGetRelid(rel), attnum);
15281 28 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
15282 : }
15283 :
15284 : /*
15285 : * Make updates-so-far visible, particularly the new pg_attribute row
15286 : * which will be updated again.
15287 : */
15288 60 : CommandCounterIncrement();
15289 :
15290 : /*
15291 : * We use RESTRICT here for safety, but at present we do not expect
15292 : * anything to depend on the default.
15293 : */
15294 60 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true,
15295 : true);
15296 :
15297 60 : (void) StoreAttrDefault(rel, attnum, defaultexpr, true);
15298 : }
15299 :
15300 764 : ObjectAddressSubSet(address, RelationRelationId,
15301 : RelationGetRelid(rel), attnum);
15302 :
15303 : /* Cleanup */
15304 764 : heap_freetuple(heapTup);
15305 :
15306 764 : return address;
15307 : }
15308 :
15309 : /*
15310 : * Subroutine for ATExecAlterColumnType and ATExecSetExpression: Find everything
15311 : * that depends on the column (constraints, indexes, etc), and record enough
15312 : * information to let us recreate the objects.
15313 : */
15314 : static void
15315 945 : RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
15316 : Relation rel, AttrNumber attnum, const char *colName)
15317 : {
15318 : Relation depRel;
15319 : ScanKeyData key[3];
15320 : SysScanDesc scan;
15321 : HeapTuple depTup;
15322 :
15323 : Assert(subtype == AT_AlterColumnType || subtype == AT_SetExpression);
15324 :
15325 945 : depRel = table_open(DependRelationId, RowExclusiveLock);
15326 :
15327 945 : ScanKeyInit(&key[0],
15328 : Anum_pg_depend_refclassid,
15329 : BTEqualStrategyNumber, F_OIDEQ,
15330 : ObjectIdGetDatum(RelationRelationId));
15331 945 : ScanKeyInit(&key[1],
15332 : Anum_pg_depend_refobjid,
15333 : BTEqualStrategyNumber, F_OIDEQ,
15334 : ObjectIdGetDatum(RelationGetRelid(rel)));
15335 945 : ScanKeyInit(&key[2],
15336 : Anum_pg_depend_refobjsubid,
15337 : BTEqualStrategyNumber, F_INT4EQ,
15338 : Int32GetDatum((int32) attnum));
15339 :
15340 945 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
15341 : NULL, 3, key);
15342 :
15343 1923 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15344 : {
15345 1002 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15346 : ObjectAddress foundObject;
15347 :
15348 1002 : foundObject.classId = foundDep->classid;
15349 1002 : foundObject.objectId = foundDep->objid;
15350 1002 : foundObject.objectSubId = foundDep->objsubid;
15351 :
15352 1002 : switch (foundObject.classId)
15353 : {
15354 192 : case RelationRelationId:
15355 : {
15356 192 : char relKind = get_rel_relkind(foundObject.objectId);
15357 :
15358 192 : if (relKind == RELKIND_INDEX ||
15359 : relKind == RELKIND_PARTITIONED_INDEX)
15360 : {
15361 : Assert(foundObject.objectSubId == 0);
15362 167 : RememberIndexForRebuilding(foundObject.objectId, tab);
15363 : }
15364 25 : else if (relKind == RELKIND_SEQUENCE)
15365 : {
15366 : /*
15367 : * This must be a SERIAL column's sequence. We need
15368 : * not do anything to it.
15369 : */
15370 : Assert(foundObject.objectSubId == 0);
15371 : }
15372 : else
15373 : {
15374 : /* Not expecting any other direct dependencies... */
15375 0 : elog(ERROR, "unexpected object depending on column: %s",
15376 : getObjectDescription(&foundObject, false));
15377 : }
15378 192 : break;
15379 : }
15380 :
15381 516 : case ConstraintRelationId:
15382 : Assert(foundObject.objectSubId == 0);
15383 516 : RememberConstraintForRebuilding(foundObject.objectId, tab);
15384 516 : break;
15385 :
15386 0 : case ProcedureRelationId:
15387 :
15388 : /*
15389 : * A new-style SQL function can depend on a column, if that
15390 : * column is referenced in the parsed function body. Ideally
15391 : * we'd automatically update the function by deparsing and
15392 : * reparsing it, but that's risky and might well fail anyhow.
15393 : * FIXME someday.
15394 : *
15395 : * This is only a problem for AT_AlterColumnType, not
15396 : * AT_SetExpression.
15397 : */
15398 0 : if (subtype == AT_AlterColumnType)
15399 0 : ereport(ERROR,
15400 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15401 : errmsg("cannot alter type of a column used by a function or procedure"),
15402 : errdetail("%s depends on column \"%s\"",
15403 : getObjectDescription(&foundObject, false),
15404 : colName)));
15405 0 : break;
15406 :
15407 8 : case RewriteRelationId:
15408 :
15409 : /*
15410 : * View/rule bodies have pretty much the same issues as
15411 : * function bodies. FIXME someday.
15412 : */
15413 8 : if (subtype == AT_AlterColumnType)
15414 8 : ereport(ERROR,
15415 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15416 : errmsg("cannot alter type of a column used by a view or rule"),
15417 : errdetail("%s depends on column \"%s\"",
15418 : getObjectDescription(&foundObject, false),
15419 : colName)));
15420 0 : break;
15421 :
15422 0 : case TriggerRelationId:
15423 :
15424 : /*
15425 : * A trigger can depend on a column because the column is
15426 : * specified as an update target, or because the column is
15427 : * used in the trigger's WHEN condition. The first case would
15428 : * not require any extra work, but the second case would
15429 : * require updating the WHEN expression, which has the same
15430 : * issues as above. Since we can't easily tell which case
15431 : * applies, we punt for both. FIXME someday.
15432 : */
15433 0 : if (subtype == AT_AlterColumnType)
15434 0 : ereport(ERROR,
15435 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15436 : errmsg("cannot alter type of a column used in a trigger definition"),
15437 : errdetail("%s depends on column \"%s\"",
15438 : getObjectDescription(&foundObject, false),
15439 : colName)));
15440 0 : break;
15441 :
15442 0 : case PolicyRelationId:
15443 :
15444 : /*
15445 : * A policy can depend on a column because the column is
15446 : * specified in the policy's USING or WITH CHECK qual
15447 : * expressions. It might be possible to rewrite and recheck
15448 : * the policy expression, but punt for now. It's certainly
15449 : * easy enough to remove and recreate the policy; still, FIXME
15450 : * someday.
15451 : */
15452 0 : if (subtype == AT_AlterColumnType)
15453 0 : ereport(ERROR,
15454 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15455 : errmsg("cannot alter type of a column used in a policy definition"),
15456 : errdetail("%s depends on column \"%s\"",
15457 : getObjectDescription(&foundObject, false),
15458 : colName)));
15459 0 : break;
15460 :
15461 233 : case AttrDefaultRelationId:
15462 : {
15463 233 : ObjectAddress col = GetAttrDefaultColumnAddress(foundObject.objectId);
15464 :
15465 450 : if (col.objectId == RelationGetRelid(rel) &&
15466 233 : col.objectSubId == attnum)
15467 : {
15468 : /*
15469 : * Ignore the column's own default expression. The
15470 : * caller deals with it.
15471 : */
15472 : }
15473 : else
15474 : {
15475 : /*
15476 : * This must be a reference from the expression of a
15477 : * generated column elsewhere in the same table.
15478 : * Changing the type/generated expression of a column
15479 : * that is used by a generated column is not allowed
15480 : * by SQL standard, so just punt for now. It might be
15481 : * doable with some thinking and effort.
15482 : */
15483 16 : if (subtype == AT_AlterColumnType)
15484 16 : ereport(ERROR,
15485 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15486 : errmsg("cannot alter type of a column used by a generated column"),
15487 : errdetail("Column \"%s\" is used by generated column \"%s\".",
15488 : colName,
15489 : get_attname(col.objectId,
15490 : col.objectSubId,
15491 : false))));
15492 : }
15493 217 : break;
15494 : }
15495 :
15496 53 : case StatisticExtRelationId:
15497 :
15498 : /*
15499 : * Give the extended-stats machinery a chance to fix anything
15500 : * that this column type change would break.
15501 : */
15502 53 : RememberStatisticsForRebuilding(foundObject.objectId, tab);
15503 53 : break;
15504 :
15505 0 : case PublicationRelRelationId:
15506 :
15507 : /*
15508 : * Column reference in a PUBLICATION ... FOR TABLE ... WHERE
15509 : * clause. Same issues as above. FIXME someday.
15510 : */
15511 0 : if (subtype == AT_AlterColumnType)
15512 0 : ereport(ERROR,
15513 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15514 : errmsg("cannot alter type of a column used by a publication WHERE clause"),
15515 : errdetail("%s depends on column \"%s\"",
15516 : getObjectDescription(&foundObject, false),
15517 : colName)));
15518 0 : break;
15519 :
15520 0 : default:
15521 :
15522 : /*
15523 : * We don't expect any other sorts of objects to depend on a
15524 : * column.
15525 : */
15526 0 : elog(ERROR, "unexpected object depending on column: %s",
15527 : getObjectDescription(&foundObject, false));
15528 : break;
15529 : }
15530 : }
15531 :
15532 921 : systable_endscan(scan);
15533 921 : table_close(depRel, NoLock);
15534 921 : }
15535 :
15536 : /*
15537 : * Subroutine for ATExecAlterColumnType: remember that a replica identity
15538 : * needs to be reset.
15539 : */
15540 : static void
15541 306 : RememberReplicaIdentityForRebuilding(Oid indoid, AlteredTableInfo *tab)
15542 : {
15543 306 : if (!get_index_isreplident(indoid))
15544 294 : return;
15545 :
15546 12 : if (tab->replicaIdentityIndex)
15547 0 : elog(ERROR, "relation %u has multiple indexes marked as replica identity", tab->relid);
15548 :
15549 12 : tab->replicaIdentityIndex = get_rel_name(indoid);
15550 : }
15551 :
15552 : /*
15553 : * Subroutine for ATExecAlterColumnType: remember any clustered index.
15554 : */
15555 : static void
15556 306 : RememberClusterOnForRebuilding(Oid indoid, AlteredTableInfo *tab)
15557 : {
15558 306 : if (!get_index_isclustered(indoid))
15559 294 : return;
15560 :
15561 12 : if (tab->clusterOnIndex)
15562 0 : elog(ERROR, "relation %u has multiple clustered indexes", tab->relid);
15563 :
15564 12 : tab->clusterOnIndex = get_rel_name(indoid);
15565 : }
15566 :
15567 : /*
15568 : * Subroutine for ATExecAlterColumnType: remember that a constraint needs
15569 : * to be rebuilt (which we might already know).
15570 : */
15571 : static void
15572 524 : RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab)
15573 : {
15574 : /*
15575 : * This de-duplication check is critical for two independent reasons: we
15576 : * mustn't try to recreate the same constraint twice, and if a constraint
15577 : * depends on more than one column whose type is to be altered, we must
15578 : * capture its definition string before applying any of the column type
15579 : * changes. ruleutils.c will get confused if we ask again later.
15580 : */
15581 524 : if (!list_member_oid(tab->changedConstraintOids, conoid))
15582 : {
15583 : /* OK, capture the constraint's existing definition string */
15584 452 : char *defstring = pg_get_constraintdef_command(conoid);
15585 : Oid indoid;
15586 :
15587 : /*
15588 : * It is critical to create not-null constraints ahead of primary key
15589 : * indexes; otherwise, the not-null constraint would be created by the
15590 : * primary key, and the constraint name would be wrong.
15591 : */
15592 452 : if (get_constraint_type(conoid) == CONSTRAINT_NOTNULL)
15593 : {
15594 163 : tab->changedConstraintOids = lcons_oid(conoid,
15595 : tab->changedConstraintOids);
15596 163 : tab->changedConstraintDefs = lcons(defstring,
15597 : tab->changedConstraintDefs);
15598 : }
15599 : else
15600 : {
15601 :
15602 289 : tab->changedConstraintOids = lappend_oid(tab->changedConstraintOids,
15603 : conoid);
15604 289 : tab->changedConstraintDefs = lappend(tab->changedConstraintDefs,
15605 : defstring);
15606 : }
15607 :
15608 : /*
15609 : * For the index of a constraint, if any, remember if it is used for
15610 : * the table's replica identity or if it is a clustered index, so that
15611 : * ATPostAlterTypeCleanup() can queue up commands necessary to restore
15612 : * those properties.
15613 : */
15614 452 : indoid = get_constraint_index(conoid);
15615 452 : if (OidIsValid(indoid))
15616 : {
15617 152 : RememberReplicaIdentityForRebuilding(indoid, tab);
15618 152 : RememberClusterOnForRebuilding(indoid, tab);
15619 : }
15620 : }
15621 524 : }
15622 :
15623 : /*
15624 : * Subroutine for ATExecAlterColumnType: remember that an index needs
15625 : * to be rebuilt (which we might already know).
15626 : */
15627 : static void
15628 167 : RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab)
15629 : {
15630 : /*
15631 : * This de-duplication check is critical for two independent reasons: we
15632 : * mustn't try to recreate the same index twice, and if an index depends
15633 : * on more than one column whose type is to be altered, we must capture
15634 : * its definition string before applying any of the column type changes.
15635 : * ruleutils.c will get confused if we ask again later.
15636 : */
15637 167 : if (!list_member_oid(tab->changedIndexOids, indoid))
15638 : {
15639 : /*
15640 : * Before adding it as an index-to-rebuild, we'd better see if it
15641 : * belongs to a constraint, and if so rebuild the constraint instead.
15642 : * Typically this check fails, because constraint indexes normally
15643 : * have only dependencies on their constraint. But it's possible for
15644 : * such an index to also have direct dependencies on table columns,
15645 : * for example with a partial exclusion constraint.
15646 : */
15647 162 : Oid conoid = get_index_constraint(indoid);
15648 :
15649 162 : if (OidIsValid(conoid))
15650 : {
15651 8 : RememberConstraintForRebuilding(conoid, tab);
15652 : }
15653 : else
15654 : {
15655 : /* OK, capture the index's existing definition string */
15656 154 : char *defstring = pg_get_indexdef_string(indoid);
15657 :
15658 154 : tab->changedIndexOids = lappend_oid(tab->changedIndexOids,
15659 : indoid);
15660 154 : tab->changedIndexDefs = lappend(tab->changedIndexDefs,
15661 : defstring);
15662 :
15663 : /*
15664 : * Remember if this index is used for the table's replica identity
15665 : * or if it is a clustered index, so that ATPostAlterTypeCleanup()
15666 : * can queue up commands necessary to restore those properties.
15667 : */
15668 154 : RememberReplicaIdentityForRebuilding(indoid, tab);
15669 154 : RememberClusterOnForRebuilding(indoid, tab);
15670 : }
15671 : }
15672 167 : }
15673 :
15674 : /*
15675 : * Subroutine for ATExecAlterColumnType: remember that a statistics object
15676 : * needs to be rebuilt (which we might already know).
15677 : */
15678 : static void
15679 53 : RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab)
15680 : {
15681 : /*
15682 : * This de-duplication check is critical for two independent reasons: we
15683 : * mustn't try to recreate the same statistics object twice, and if the
15684 : * statistics object depends on more than one column whose type is to be
15685 : * altered, we must capture its definition string before applying any of
15686 : * the type changes. ruleutils.c will get confused if we ask again later.
15687 : */
15688 53 : if (!list_member_oid(tab->changedStatisticsOids, stxoid))
15689 : {
15690 : /* OK, capture the statistics object's existing definition string */
15691 53 : char *defstring = pg_get_statisticsobjdef_string(stxoid);
15692 :
15693 53 : tab->changedStatisticsOids = lappend_oid(tab->changedStatisticsOids,
15694 : stxoid);
15695 53 : tab->changedStatisticsDefs = lappend(tab->changedStatisticsDefs,
15696 : defstring);
15697 : }
15698 53 : }
15699 :
15700 : /*
15701 : * Cleanup after we've finished all the ALTER TYPE or SET EXPRESSION
15702 : * operations for a particular relation. We have to drop and recreate all the
15703 : * indexes and constraints that depend on the altered columns. We do the
15704 : * actual dropping here, but re-creation is managed by adding work queue
15705 : * entries to do those steps later.
15706 : */
15707 : static void
15708 889 : ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode)
15709 : {
15710 : ObjectAddress obj;
15711 : ObjectAddresses *objects;
15712 : ListCell *def_item;
15713 : ListCell *oid_item;
15714 :
15715 : /*
15716 : * Collect all the constraints and indexes to drop so we can process them
15717 : * in a single call. That way we don't have to worry about dependencies
15718 : * among them.
15719 : */
15720 889 : objects = new_object_addresses();
15721 :
15722 : /*
15723 : * Re-parse the index and constraint definitions, and attach them to the
15724 : * appropriate work queue entries. We do this before dropping because in
15725 : * the case of a constraint on another table, we might not yet have
15726 : * exclusive lock on the table the constraint is attached to, and we need
15727 : * to get that before reparsing/dropping. (That's possible at least for
15728 : * FOREIGN KEY, CHECK, and EXCLUSION constraints; in non-FK cases it
15729 : * requires a dependency on the target table's composite type in the other
15730 : * table's constraint expressions.)
15731 : *
15732 : * We can't rely on the output of deparsing to tell us which relation to
15733 : * operate on, because concurrent activity might have made the name
15734 : * resolve differently. Instead, we've got to use the OID of the
15735 : * constraint or index we're processing to figure out which relation to
15736 : * operate on.
15737 : */
15738 1341 : forboth(oid_item, tab->changedConstraintOids,
15739 : def_item, tab->changedConstraintDefs)
15740 : {
15741 452 : Oid oldId = lfirst_oid(oid_item);
15742 : HeapTuple tup;
15743 : Form_pg_constraint con;
15744 : Oid relid;
15745 : Oid confrelid;
15746 : bool conislocal;
15747 :
15748 452 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15749 452 : if (!HeapTupleIsValid(tup)) /* should not happen */
15750 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15751 452 : con = (Form_pg_constraint) GETSTRUCT(tup);
15752 452 : if (OidIsValid(con->conrelid))
15753 443 : relid = con->conrelid;
15754 : else
15755 : {
15756 : /* must be a domain constraint */
15757 9 : relid = get_typ_typrelid(getBaseType(con->contypid));
15758 9 : if (!OidIsValid(relid))
15759 0 : elog(ERROR, "could not identify relation associated with constraint %u", oldId);
15760 : }
15761 452 : confrelid = con->confrelid;
15762 452 : conislocal = con->conislocal;
15763 452 : ReleaseSysCache(tup);
15764 :
15765 452 : ObjectAddressSet(obj, ConstraintRelationId, oldId);
15766 452 : add_exact_object_address(&obj, objects);
15767 :
15768 : /*
15769 : * If the constraint is inherited (only), we don't want to inject a
15770 : * new definition here; it'll get recreated when
15771 : * ATAddCheckNNConstraint recurses from adding the parent table's
15772 : * constraint. But we had to carry the info this far so that we can
15773 : * drop the constraint below.
15774 : */
15775 452 : if (!conislocal)
15776 34 : continue;
15777 :
15778 : /*
15779 : * When rebuilding another table's constraint that references the
15780 : * table we're modifying, we might not yet have any lock on the other
15781 : * table, so get one now. We'll need AccessExclusiveLock for the DROP
15782 : * CONSTRAINT step, so there's no value in asking for anything weaker.
15783 : */
15784 418 : if (relid != tab->relid)
15785 36 : LockRelationOid(relid, AccessExclusiveLock);
15786 :
15787 418 : ATPostAlterTypeParse(oldId, relid, confrelid,
15788 418 : (char *) lfirst(def_item),
15789 418 : wqueue, lockmode, tab->rewrite);
15790 : }
15791 1043 : forboth(oid_item, tab->changedIndexOids,
15792 : def_item, tab->changedIndexDefs)
15793 : {
15794 154 : Oid oldId = lfirst_oid(oid_item);
15795 : Oid relid;
15796 :
15797 154 : relid = IndexGetRelation(oldId, false);
15798 :
15799 : /*
15800 : * As above, make sure we have lock on the index's table if it's not
15801 : * the same table.
15802 : */
15803 154 : if (relid != tab->relid)
15804 12 : LockRelationOid(relid, AccessExclusiveLock);
15805 :
15806 154 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15807 154 : (char *) lfirst(def_item),
15808 154 : wqueue, lockmode, tab->rewrite);
15809 :
15810 154 : ObjectAddressSet(obj, RelationRelationId, oldId);
15811 154 : add_exact_object_address(&obj, objects);
15812 : }
15813 :
15814 : /* add dependencies for new statistics */
15815 942 : forboth(oid_item, tab->changedStatisticsOids,
15816 : def_item, tab->changedStatisticsDefs)
15817 : {
15818 53 : Oid oldId = lfirst_oid(oid_item);
15819 : Oid relid;
15820 :
15821 53 : relid = StatisticsGetRelation(oldId, false);
15822 :
15823 : /*
15824 : * As above, make sure we have lock on the statistics object's table
15825 : * if it's not the same table. However, we take
15826 : * ShareUpdateExclusiveLock here, aligning with the lock level used in
15827 : * CreateStatistics and RemoveStatisticsById.
15828 : *
15829 : * CAUTION: this should be done after all cases that grab
15830 : * AccessExclusiveLock, else we risk causing deadlock due to needing
15831 : * to promote our table lock.
15832 : */
15833 53 : if (relid != tab->relid)
15834 12 : LockRelationOid(relid, ShareUpdateExclusiveLock);
15835 :
15836 53 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15837 53 : (char *) lfirst(def_item),
15838 53 : wqueue, lockmode, tab->rewrite);
15839 :
15840 53 : ObjectAddressSet(obj, StatisticExtRelationId, oldId);
15841 53 : add_exact_object_address(&obj, objects);
15842 : }
15843 :
15844 : /*
15845 : * Queue up command to restore replica identity index marking
15846 : */
15847 889 : if (tab->replicaIdentityIndex)
15848 : {
15849 12 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15850 12 : ReplicaIdentityStmt *subcmd = makeNode(ReplicaIdentityStmt);
15851 :
15852 12 : subcmd->identity_type = REPLICA_IDENTITY_INDEX;
15853 12 : subcmd->name = tab->replicaIdentityIndex;
15854 12 : cmd->subtype = AT_ReplicaIdentity;
15855 12 : cmd->def = (Node *) subcmd;
15856 :
15857 : /* do it after indexes and constraints */
15858 12 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15859 12 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15860 : }
15861 :
15862 : /*
15863 : * Queue up command to restore marking of index used for cluster.
15864 : */
15865 889 : if (tab->clusterOnIndex)
15866 : {
15867 12 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15868 :
15869 12 : cmd->subtype = AT_ClusterOn;
15870 12 : cmd->name = tab->clusterOnIndex;
15871 :
15872 : /* do it after indexes and constraints */
15873 12 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15874 12 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15875 : }
15876 :
15877 : /*
15878 : * It should be okay to use DROP_RESTRICT here, since nothing else should
15879 : * be depending on these objects.
15880 : */
15881 889 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
15882 :
15883 889 : free_object_addresses(objects);
15884 :
15885 : /*
15886 : * The objects will get recreated during subsequent passes over the work
15887 : * queue.
15888 : */
15889 889 : }
15890 :
15891 : /*
15892 : * Parse the previously-saved definition string for a constraint, index or
15893 : * statistics object against the newly-established column data type(s), and
15894 : * queue up the resulting command parsetrees for execution.
15895 : *
15896 : * This might fail if, for example, you have a WHERE clause that uses an
15897 : * operator that's not available for the new column type.
15898 : */
15899 : static void
15900 625 : ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
15901 : List **wqueue, LOCKMODE lockmode, bool rewrite)
15902 : {
15903 : List *raw_parsetree_list;
15904 : List *querytree_list;
15905 : ListCell *list_item;
15906 : Relation rel;
15907 :
15908 : /*
15909 : * We expect that we will get only ALTER TABLE and CREATE INDEX
15910 : * statements. Hence, there is no need to pass them through
15911 : * parse_analyze_*() or the rewriter, but instead we need to pass them
15912 : * through parse_utilcmd.c to make them ready for execution.
15913 : */
15914 625 : raw_parsetree_list = raw_parser(cmd, RAW_PARSE_DEFAULT);
15915 625 : querytree_list = NIL;
15916 1250 : foreach(list_item, raw_parsetree_list)
15917 : {
15918 625 : RawStmt *rs = lfirst_node(RawStmt, list_item);
15919 625 : Node *stmt = rs->stmt;
15920 :
15921 625 : if (IsA(stmt, IndexStmt))
15922 154 : querytree_list = lappend(querytree_list,
15923 154 : transformIndexStmt(oldRelId,
15924 : (IndexStmt *) stmt,
15925 : cmd));
15926 471 : else if (IsA(stmt, AlterTableStmt))
15927 : {
15928 : List *beforeStmts;
15929 : List *afterStmts;
15930 :
15931 409 : stmt = (Node *) transformAlterTableStmt(oldRelId,
15932 : (AlterTableStmt *) stmt,
15933 : cmd,
15934 : &beforeStmts,
15935 : &afterStmts);
15936 409 : querytree_list = list_concat(querytree_list, beforeStmts);
15937 409 : querytree_list = lappend(querytree_list, stmt);
15938 409 : querytree_list = list_concat(querytree_list, afterStmts);
15939 : }
15940 62 : else if (IsA(stmt, CreateStatsStmt))
15941 53 : querytree_list = lappend(querytree_list,
15942 53 : transformStatsStmt(oldRelId,
15943 : (CreateStatsStmt *) stmt,
15944 : cmd));
15945 : else
15946 9 : querytree_list = lappend(querytree_list, stmt);
15947 : }
15948 :
15949 : /* Caller should already have acquired whatever lock we need. */
15950 625 : rel = relation_open(oldRelId, NoLock);
15951 :
15952 : /*
15953 : * Attach each generated command to the proper place in the work queue.
15954 : * Note this could result in creation of entirely new work-queue entries.
15955 : *
15956 : * Also note that we have to tweak the command subtypes, because it turns
15957 : * out that re-creation of indexes and constraints has to act a bit
15958 : * differently from initial creation.
15959 : */
15960 1250 : foreach(list_item, querytree_list)
15961 : {
15962 625 : Node *stm = (Node *) lfirst(list_item);
15963 : AlteredTableInfo *tab;
15964 :
15965 625 : tab = ATGetQueueEntry(wqueue, rel);
15966 :
15967 625 : if (IsA(stm, IndexStmt))
15968 : {
15969 154 : IndexStmt *stmt = (IndexStmt *) stm;
15970 : AlterTableCmd *newcmd;
15971 :
15972 154 : if (!rewrite)
15973 41 : TryReuseIndex(oldId, stmt);
15974 154 : stmt->reset_default_tblspc = true;
15975 : /* keep the index's comment */
15976 154 : stmt->idxcomment = GetComment(oldId, RelationRelationId, 0);
15977 :
15978 154 : newcmd = makeNode(AlterTableCmd);
15979 154 : newcmd->subtype = AT_ReAddIndex;
15980 154 : newcmd->def = (Node *) stmt;
15981 154 : tab->subcmds[AT_PASS_OLD_INDEX] =
15982 154 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], newcmd);
15983 : }
15984 471 : else if (IsA(stm, AlterTableStmt))
15985 : {
15986 409 : AlterTableStmt *stmt = (AlterTableStmt *) stm;
15987 : ListCell *lcmd;
15988 :
15989 818 : foreach(lcmd, stmt->cmds)
15990 : {
15991 409 : AlterTableCmd *cmd = lfirst_node(AlterTableCmd, lcmd);
15992 :
15993 409 : if (cmd->subtype == AT_AddIndex)
15994 : {
15995 : IndexStmt *indstmt;
15996 : Oid indoid;
15997 :
15998 152 : indstmt = castNode(IndexStmt, cmd->def);
15999 152 : indoid = get_constraint_index(oldId);
16000 :
16001 152 : if (!rewrite)
16002 32 : TryReuseIndex(indoid, indstmt);
16003 : /* keep any comment on the index */
16004 152 : indstmt->idxcomment = GetComment(indoid,
16005 : RelationRelationId, 0);
16006 152 : indstmt->reset_default_tblspc = true;
16007 :
16008 152 : cmd->subtype = AT_ReAddIndex;
16009 152 : tab->subcmds[AT_PASS_OLD_INDEX] =
16010 152 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], cmd);
16011 :
16012 : /* recreate any comment on the constraint */
16013 152 : RebuildConstraintComment(tab,
16014 : AT_PASS_OLD_INDEX,
16015 : oldId,
16016 : rel,
16017 : NIL,
16018 152 : indstmt->idxname);
16019 : }
16020 257 : else if (cmd->subtype == AT_AddConstraint)
16021 : {
16022 257 : Constraint *con = castNode(Constraint, cmd->def);
16023 :
16024 257 : con->old_pktable_oid = refRelId;
16025 : /* rewriting neither side of a FK */
16026 257 : if (con->contype == CONSTR_FOREIGN &&
16027 48 : !rewrite && tab->rewrite == 0)
16028 4 : TryReuseForeignKey(oldId, con);
16029 257 : con->reset_default_tblspc = true;
16030 257 : cmd->subtype = AT_ReAddConstraint;
16031 257 : tab->subcmds[AT_PASS_OLD_CONSTR] =
16032 257 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
16033 :
16034 : /*
16035 : * Recreate any comment on the constraint. If we have
16036 : * recreated a primary key, then transformTableConstraint
16037 : * has added an unnamed not-null constraint here; skip
16038 : * this in that case.
16039 : */
16040 257 : if (con->conname)
16041 257 : RebuildConstraintComment(tab,
16042 : AT_PASS_OLD_CONSTR,
16043 : oldId,
16044 : rel,
16045 : NIL,
16046 257 : con->conname);
16047 : else
16048 : Assert(con->contype == CONSTR_NOTNULL);
16049 : }
16050 : else
16051 0 : elog(ERROR, "unexpected statement subtype: %d",
16052 : (int) cmd->subtype);
16053 : }
16054 : }
16055 62 : else if (IsA(stm, AlterDomainStmt))
16056 : {
16057 9 : AlterDomainStmt *stmt = (AlterDomainStmt *) stm;
16058 :
16059 9 : if (stmt->subtype == AD_AddConstraint)
16060 : {
16061 9 : Constraint *con = castNode(Constraint, stmt->def);
16062 9 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
16063 :
16064 9 : cmd->subtype = AT_ReAddDomainConstraint;
16065 9 : cmd->def = (Node *) stmt;
16066 9 : tab->subcmds[AT_PASS_OLD_CONSTR] =
16067 9 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
16068 :
16069 : /* recreate any comment on the constraint */
16070 9 : RebuildConstraintComment(tab,
16071 : AT_PASS_OLD_CONSTR,
16072 : oldId,
16073 : NULL,
16074 : stmt->typeName,
16075 9 : con->conname);
16076 : }
16077 : else
16078 0 : elog(ERROR, "unexpected statement subtype: %d",
16079 : (int) stmt->subtype);
16080 : }
16081 53 : else if (IsA(stm, CreateStatsStmt))
16082 : {
16083 53 : CreateStatsStmt *stmt = (CreateStatsStmt *) stm;
16084 : AlterTableCmd *newcmd;
16085 :
16086 : /* keep the statistics object's comment */
16087 53 : stmt->stxcomment = GetComment(oldId, StatisticExtRelationId, 0);
16088 :
16089 53 : newcmd = makeNode(AlterTableCmd);
16090 53 : newcmd->subtype = AT_ReAddStatistics;
16091 53 : newcmd->def = (Node *) stmt;
16092 53 : tab->subcmds[AT_PASS_MISC] =
16093 53 : lappend(tab->subcmds[AT_PASS_MISC], newcmd);
16094 : }
16095 : else
16096 0 : elog(ERROR, "unexpected statement type: %d",
16097 : (int) nodeTag(stm));
16098 : }
16099 :
16100 625 : relation_close(rel, NoLock);
16101 625 : }
16102 :
16103 : /*
16104 : * Subroutine for ATPostAlterTypeParse() to recreate any existing comment
16105 : * for a table or domain constraint that is being rebuilt.
16106 : *
16107 : * objid is the OID of the constraint.
16108 : * Pass "rel" for a table constraint, or "domname" (domain's qualified name
16109 : * as a string list) for a domain constraint.
16110 : * (We could dig that info, as well as the conname, out of the pg_constraint
16111 : * entry; but callers already have them so might as well pass them.)
16112 : */
16113 : static void
16114 418 : RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass, Oid objid,
16115 : Relation rel, List *domname,
16116 : const char *conname)
16117 : {
16118 : CommentStmt *cmd;
16119 : char *comment_str;
16120 : AlterTableCmd *newcmd;
16121 :
16122 : /* Look for comment for object wanted, and leave if none */
16123 418 : comment_str = GetComment(objid, ConstraintRelationId, 0);
16124 418 : if (comment_str == NULL)
16125 358 : return;
16126 :
16127 : /* Build CommentStmt node, copying all input data for safety */
16128 60 : cmd = makeNode(CommentStmt);
16129 60 : if (rel)
16130 : {
16131 52 : cmd->objtype = OBJECT_TABCONSTRAINT;
16132 52 : cmd->object = (Node *)
16133 52 : list_make3(makeString(get_namespace_name(RelationGetNamespace(rel))),
16134 : makeString(pstrdup(RelationGetRelationName(rel))),
16135 : makeString(pstrdup(conname)));
16136 : }
16137 : else
16138 : {
16139 8 : cmd->objtype = OBJECT_DOMCONSTRAINT;
16140 8 : cmd->object = (Node *)
16141 8 : list_make2(makeTypeNameFromNameList(copyObject(domname)),
16142 : makeString(pstrdup(conname)));
16143 : }
16144 60 : cmd->comment = comment_str;
16145 :
16146 : /* Append it to list of commands */
16147 60 : newcmd = makeNode(AlterTableCmd);
16148 60 : newcmd->subtype = AT_ReAddComment;
16149 60 : newcmd->def = (Node *) cmd;
16150 60 : tab->subcmds[pass] = lappend(tab->subcmds[pass], newcmd);
16151 : }
16152 :
16153 : /*
16154 : * Subroutine for ATPostAlterTypeParse(). Calls out to CheckIndexCompatible()
16155 : * for the real analysis, then mutates the IndexStmt based on that verdict.
16156 : */
16157 : static void
16158 73 : TryReuseIndex(Oid oldId, IndexStmt *stmt)
16159 : {
16160 73 : if (CheckIndexCompatible(oldId,
16161 73 : stmt->accessMethod,
16162 73 : stmt->indexParams,
16163 73 : stmt->excludeOpNames,
16164 73 : stmt->iswithoutoverlaps))
16165 : {
16166 69 : Relation irel = index_open(oldId, NoLock);
16167 :
16168 : /* If it's a partitioned index, there is no storage to share. */
16169 69 : if (irel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
16170 : {
16171 49 : stmt->oldNumber = irel->rd_locator.relNumber;
16172 49 : stmt->oldCreateSubid = irel->rd_createSubid;
16173 49 : stmt->oldFirstRelfilelocatorSubid = irel->rd_firstRelfilelocatorSubid;
16174 : }
16175 69 : index_close(irel, NoLock);
16176 : }
16177 73 : }
16178 :
16179 : /*
16180 : * Subroutine for ATPostAlterTypeParse().
16181 : *
16182 : * Stash the old P-F equality operator into the Constraint node, for possible
16183 : * use by ATAddForeignKeyConstraint() in determining whether revalidation of
16184 : * this constraint can be skipped.
16185 : */
16186 : static void
16187 4 : TryReuseForeignKey(Oid oldId, Constraint *con)
16188 : {
16189 : HeapTuple tup;
16190 : Datum adatum;
16191 : ArrayType *arr;
16192 : Oid *rawarr;
16193 : int numkeys;
16194 : int i;
16195 :
16196 : Assert(con->contype == CONSTR_FOREIGN);
16197 : Assert(con->old_conpfeqop == NIL); /* already prepared this node */
16198 :
16199 4 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
16200 4 : if (!HeapTupleIsValid(tup)) /* should not happen */
16201 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
16202 :
16203 4 : adatum = SysCacheGetAttrNotNull(CONSTROID, tup,
16204 : Anum_pg_constraint_conpfeqop);
16205 4 : arr = DatumGetArrayTypeP(adatum); /* ensure not toasted */
16206 4 : numkeys = ARR_DIMS(arr)[0];
16207 : /* test follows the one in ri_FetchConstraintInfo() */
16208 4 : if (ARR_NDIM(arr) != 1 ||
16209 4 : ARR_HASNULL(arr) ||
16210 4 : ARR_ELEMTYPE(arr) != OIDOID)
16211 0 : elog(ERROR, "conpfeqop is not a 1-D Oid array");
16212 4 : rawarr = (Oid *) ARR_DATA_PTR(arr);
16213 :
16214 : /* stash a List of the operator Oids in our Constraint node */
16215 8 : for (i = 0; i < numkeys; i++)
16216 4 : con->old_conpfeqop = lappend_oid(con->old_conpfeqop, rawarr[i]);
16217 :
16218 4 : ReleaseSysCache(tup);
16219 4 : }
16220 :
16221 : /*
16222 : * ALTER COLUMN .. OPTIONS ( ... )
16223 : *
16224 : * Returns the address of the modified column
16225 : */
16226 : static ObjectAddress
16227 94 : ATExecAlterColumnGenericOptions(Relation rel,
16228 : const char *colName,
16229 : List *options,
16230 : LOCKMODE lockmode)
16231 : {
16232 : Relation ftrel;
16233 : Relation attrel;
16234 : ForeignServer *server;
16235 : ForeignDataWrapper *fdw;
16236 : HeapTuple tuple;
16237 : HeapTuple newtuple;
16238 : bool isnull;
16239 : Datum repl_val[Natts_pg_attribute];
16240 : bool repl_null[Natts_pg_attribute];
16241 : bool repl_repl[Natts_pg_attribute];
16242 : Datum datum;
16243 : Form_pg_foreign_table fttableform;
16244 : Form_pg_attribute atttableform;
16245 : AttrNumber attnum;
16246 : ObjectAddress address;
16247 :
16248 94 : if (options == NIL)
16249 0 : return InvalidObjectAddress;
16250 :
16251 : /* First, determine FDW validator associated to the foreign table. */
16252 94 : ftrel = table_open(ForeignTableRelationId, AccessShareLock);
16253 94 : tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(rel->rd_id));
16254 94 : if (!HeapTupleIsValid(tuple))
16255 0 : ereport(ERROR,
16256 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16257 : errmsg("foreign table \"%s\" does not exist",
16258 : RelationGetRelationName(rel))));
16259 94 : fttableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
16260 94 : server = GetForeignServer(fttableform->ftserver);
16261 94 : fdw = GetForeignDataWrapper(server->fdwid);
16262 :
16263 94 : table_close(ftrel, AccessShareLock);
16264 94 : ReleaseSysCache(tuple);
16265 :
16266 94 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
16267 94 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
16268 94 : if (!HeapTupleIsValid(tuple))
16269 0 : ereport(ERROR,
16270 : (errcode(ERRCODE_UNDEFINED_COLUMN),
16271 : errmsg("column \"%s\" of relation \"%s\" does not exist",
16272 : colName, RelationGetRelationName(rel))));
16273 :
16274 : /* Prevent them from altering a system attribute */
16275 94 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
16276 94 : attnum = atttableform->attnum;
16277 94 : if (attnum <= 0)
16278 4 : ereport(ERROR,
16279 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16280 : errmsg("cannot alter system column \"%s\"", colName)));
16281 :
16282 :
16283 : /* Initialize buffers for new tuple values */
16284 90 : memset(repl_val, 0, sizeof(repl_val));
16285 90 : memset(repl_null, false, sizeof(repl_null));
16286 90 : memset(repl_repl, false, sizeof(repl_repl));
16287 :
16288 : /* Extract the current options */
16289 90 : datum = SysCacheGetAttr(ATTNAME,
16290 : tuple,
16291 : Anum_pg_attribute_attfdwoptions,
16292 : &isnull);
16293 90 : if (isnull)
16294 84 : datum = PointerGetDatum(NULL);
16295 :
16296 : /* Transform the options */
16297 90 : datum = transformGenericOptions(AttributeRelationId,
16298 : datum,
16299 : options,
16300 : fdw->fdwvalidator);
16301 :
16302 90 : if (DatumGetPointer(datum) != NULL)
16303 90 : repl_val[Anum_pg_attribute_attfdwoptions - 1] = datum;
16304 : else
16305 0 : repl_null[Anum_pg_attribute_attfdwoptions - 1] = true;
16306 :
16307 90 : repl_repl[Anum_pg_attribute_attfdwoptions - 1] = true;
16308 :
16309 : /* Everything looks good - update the tuple */
16310 :
16311 90 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrel),
16312 : repl_val, repl_null, repl_repl);
16313 :
16314 90 : CatalogTupleUpdate(attrel, &newtuple->t_self, newtuple);
16315 :
16316 90 : InvokeObjectPostAlterHook(RelationRelationId,
16317 : RelationGetRelid(rel),
16318 : atttableform->attnum);
16319 90 : ObjectAddressSubSet(address, RelationRelationId,
16320 : RelationGetRelid(rel), attnum);
16321 :
16322 90 : ReleaseSysCache(tuple);
16323 :
16324 90 : table_close(attrel, RowExclusiveLock);
16325 :
16326 90 : heap_freetuple(newtuple);
16327 :
16328 90 : return address;
16329 : }
16330 :
16331 : /*
16332 : * ALTER TABLE OWNER
16333 : *
16334 : * recursing is true if we are recursing from a table to its indexes,
16335 : * sequences, or toast table. We don't allow the ownership of those things to
16336 : * be changed separately from the parent table. Also, we can skip permission
16337 : * checks (this is necessary not just an optimization, else we'd fail to
16338 : * handle toast tables properly).
16339 : *
16340 : * recursing is also true if ALTER TYPE OWNER is calling us to fix up a
16341 : * free-standing composite type.
16342 : */
16343 : void
16344 1356 : ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing, LOCKMODE lockmode)
16345 : {
16346 : Relation target_rel;
16347 : Relation class_rel;
16348 : HeapTuple tuple;
16349 : Form_pg_class tuple_class;
16350 :
16351 : /*
16352 : * Get exclusive lock till end of transaction on the target table. Use
16353 : * relation_open so that we can work on indexes and sequences.
16354 : */
16355 1356 : target_rel = relation_open(relationOid, lockmode);
16356 :
16357 : /* Get its pg_class tuple, too */
16358 1356 : class_rel = table_open(RelationRelationId, RowExclusiveLock);
16359 :
16360 1356 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relationOid));
16361 1356 : if (!HeapTupleIsValid(tuple))
16362 0 : elog(ERROR, "cache lookup failed for relation %u", relationOid);
16363 1356 : tuple_class = (Form_pg_class) GETSTRUCT(tuple);
16364 :
16365 : /* Can we change the ownership of this tuple? */
16366 1356 : switch (tuple_class->relkind)
16367 : {
16368 1138 : case RELKIND_RELATION:
16369 : case RELKIND_VIEW:
16370 : case RELKIND_MATVIEW:
16371 : case RELKIND_FOREIGN_TABLE:
16372 : case RELKIND_PARTITIONED_TABLE:
16373 : case RELKIND_PROPGRAPH:
16374 : /* ok to change owner */
16375 1138 : break;
16376 91 : case RELKIND_INDEX:
16377 91 : if (!recursing)
16378 : {
16379 : /*
16380 : * Because ALTER INDEX OWNER used to be allowed, and in fact
16381 : * is generated by old versions of pg_dump, we give a warning
16382 : * and do nothing rather than erroring out. Also, to avoid
16383 : * unnecessary chatter while restoring those old dumps, say
16384 : * nothing at all if the command would be a no-op anyway.
16385 : */
16386 0 : if (tuple_class->relowner != newOwnerId)
16387 0 : ereport(WARNING,
16388 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16389 : errmsg("cannot change owner of index \"%s\"",
16390 : NameStr(tuple_class->relname)),
16391 : errhint("Change the ownership of the index's table instead.")));
16392 : /* quick hack to exit via the no-op path */
16393 0 : newOwnerId = tuple_class->relowner;
16394 : }
16395 91 : break;
16396 14 : case RELKIND_PARTITIONED_INDEX:
16397 14 : if (recursing)
16398 14 : break;
16399 0 : ereport(ERROR,
16400 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16401 : errmsg("cannot change owner of index \"%s\"",
16402 : NameStr(tuple_class->relname)),
16403 : errhint("Change the ownership of the index's table instead.")));
16404 : break;
16405 65 : case RELKIND_SEQUENCE:
16406 65 : if (!recursing &&
16407 35 : tuple_class->relowner != newOwnerId)
16408 : {
16409 : /* if it's an owned sequence, disallow changing it by itself */
16410 : Oid tableId;
16411 : int32 colId;
16412 :
16413 0 : if (sequenceIsOwned(relationOid, DEPENDENCY_AUTO, &tableId, &colId) ||
16414 0 : sequenceIsOwned(relationOid, DEPENDENCY_INTERNAL, &tableId, &colId))
16415 0 : ereport(ERROR,
16416 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16417 : errmsg("cannot change owner of sequence \"%s\"",
16418 : NameStr(tuple_class->relname)),
16419 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
16420 : NameStr(tuple_class->relname),
16421 : get_rel_name(tableId))));
16422 : }
16423 65 : break;
16424 5 : case RELKIND_COMPOSITE_TYPE:
16425 5 : if (recursing)
16426 5 : break;
16427 0 : ereport(ERROR,
16428 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16429 : errmsg("\"%s\" is a composite type",
16430 : NameStr(tuple_class->relname)),
16431 : /* translator: %s is an SQL ALTER command */
16432 : errhint("Use %s instead.",
16433 : "ALTER TYPE")));
16434 : break;
16435 43 : case RELKIND_TOASTVALUE:
16436 43 : if (recursing)
16437 43 : break;
16438 : pg_fallthrough;
16439 : default:
16440 0 : ereport(ERROR,
16441 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16442 : errmsg("cannot change owner of relation \"%s\"",
16443 : NameStr(tuple_class->relname)),
16444 : errdetail_relkind_not_supported(tuple_class->relkind)));
16445 : }
16446 :
16447 : /*
16448 : * If the new owner is the same as the existing owner, consider the
16449 : * command to have succeeded. This is for dump restoration purposes.
16450 : */
16451 1356 : if (tuple_class->relowner != newOwnerId)
16452 : {
16453 : Datum repl_val[Natts_pg_class];
16454 : bool repl_null[Natts_pg_class];
16455 : bool repl_repl[Natts_pg_class];
16456 : Acl *newAcl;
16457 : Datum aclDatum;
16458 : bool isNull;
16459 : HeapTuple newtuple;
16460 :
16461 : /* skip permission checks when recursing to index or toast table */
16462 424 : if (!recursing)
16463 : {
16464 : /* Superusers can always do it */
16465 215 : if (!superuser())
16466 : {
16467 28 : Oid namespaceOid = tuple_class->relnamespace;
16468 : AclResult aclresult;
16469 :
16470 : /* Otherwise, must be owner of the existing object */
16471 28 : if (!object_ownercheck(RelationRelationId, relationOid, GetUserId()))
16472 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relationOid)),
16473 0 : RelationGetRelationName(target_rel));
16474 :
16475 : /* Must be able to become new owner */
16476 28 : check_can_set_role(GetUserId(), newOwnerId);
16477 :
16478 : /* New owner must have CREATE privilege on namespace */
16479 20 : aclresult = object_aclcheck(NamespaceRelationId, namespaceOid, newOwnerId,
16480 : ACL_CREATE);
16481 20 : if (aclresult != ACLCHECK_OK)
16482 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
16483 0 : get_namespace_name(namespaceOid));
16484 : }
16485 : }
16486 :
16487 416 : memset(repl_null, false, sizeof(repl_null));
16488 416 : memset(repl_repl, false, sizeof(repl_repl));
16489 :
16490 416 : repl_repl[Anum_pg_class_relowner - 1] = true;
16491 416 : repl_val[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(newOwnerId);
16492 :
16493 : /*
16494 : * Determine the modified ACL for the new owner. This is only
16495 : * necessary when the ACL is non-null.
16496 : */
16497 416 : aclDatum = SysCacheGetAttr(RELOID, tuple,
16498 : Anum_pg_class_relacl,
16499 : &isNull);
16500 416 : if (!isNull)
16501 : {
16502 60 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16503 : tuple_class->relowner, newOwnerId);
16504 60 : repl_repl[Anum_pg_class_relacl - 1] = true;
16505 60 : repl_val[Anum_pg_class_relacl - 1] = PointerGetDatum(newAcl);
16506 : }
16507 :
16508 416 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(class_rel), repl_val, repl_null, repl_repl);
16509 :
16510 416 : CatalogTupleUpdate(class_rel, &newtuple->t_self, newtuple);
16511 :
16512 416 : heap_freetuple(newtuple);
16513 :
16514 : /*
16515 : * We must similarly update any per-column ACLs to reflect the new
16516 : * owner; for neatness reasons that's split out as a subroutine.
16517 : */
16518 416 : change_owner_fix_column_acls(relationOid,
16519 : tuple_class->relowner,
16520 : newOwnerId);
16521 :
16522 : /*
16523 : * Update owner dependency reference, if any. A composite type has
16524 : * none, because it's tracked for the pg_type entry instead of here;
16525 : * indexes and TOAST tables don't have their own entries either.
16526 : */
16527 416 : if (tuple_class->relkind != RELKIND_COMPOSITE_TYPE &&
16528 411 : tuple_class->relkind != RELKIND_INDEX &&
16529 320 : tuple_class->relkind != RELKIND_PARTITIONED_INDEX &&
16530 306 : tuple_class->relkind != RELKIND_TOASTVALUE)
16531 263 : changeDependencyOnOwner(RelationRelationId, relationOid,
16532 : newOwnerId);
16533 :
16534 : /*
16535 : * Also change the ownership of the table's row type, if it has one
16536 : */
16537 416 : if (OidIsValid(tuple_class->reltype))
16538 243 : AlterTypeOwnerInternal(tuple_class->reltype, newOwnerId);
16539 :
16540 : /*
16541 : * If we are operating on a table or materialized view, also change
16542 : * the ownership of any indexes and sequences that belong to the
16543 : * relation, as well as its toast table (if it has one).
16544 : */
16545 416 : if (tuple_class->relkind == RELKIND_RELATION ||
16546 229 : tuple_class->relkind == RELKIND_PARTITIONED_TABLE ||
16547 192 : tuple_class->relkind == RELKIND_MATVIEW ||
16548 192 : tuple_class->relkind == RELKIND_TOASTVALUE)
16549 : {
16550 : List *index_oid_list;
16551 : ListCell *i;
16552 :
16553 : /* Find all the indexes belonging to this relation */
16554 267 : index_oid_list = RelationGetIndexList(target_rel);
16555 :
16556 : /* For each index, recursively change its ownership */
16557 372 : foreach(i, index_oid_list)
16558 105 : ATExecChangeOwner(lfirst_oid(i), newOwnerId, true, lockmode);
16559 :
16560 267 : list_free(index_oid_list);
16561 : }
16562 :
16563 : /* If it has a toast table, recurse to change its ownership */
16564 416 : if (tuple_class->reltoastrelid != InvalidOid)
16565 43 : ATExecChangeOwner(tuple_class->reltoastrelid, newOwnerId,
16566 : true, lockmode);
16567 :
16568 : /* If it has dependent sequences, recurse to change them too */
16569 416 : change_owner_recurse_to_sequences(relationOid, newOwnerId, lockmode);
16570 : }
16571 :
16572 1348 : InvokeObjectPostAlterHook(RelationRelationId, relationOid, 0);
16573 :
16574 1348 : ReleaseSysCache(tuple);
16575 1348 : table_close(class_rel, RowExclusiveLock);
16576 1348 : relation_close(target_rel, NoLock);
16577 1348 : }
16578 :
16579 : /*
16580 : * change_owner_fix_column_acls
16581 : *
16582 : * Helper function for ATExecChangeOwner. Scan the columns of the table
16583 : * and fix any non-null column ACLs to reflect the new owner.
16584 : */
16585 : static void
16586 416 : change_owner_fix_column_acls(Oid relationOid, Oid oldOwnerId, Oid newOwnerId)
16587 : {
16588 : Relation attRelation;
16589 : SysScanDesc scan;
16590 : ScanKeyData key[1];
16591 : HeapTuple attributeTuple;
16592 :
16593 416 : attRelation = table_open(AttributeRelationId, RowExclusiveLock);
16594 416 : ScanKeyInit(&key[0],
16595 : Anum_pg_attribute_attrelid,
16596 : BTEqualStrategyNumber, F_OIDEQ,
16597 : ObjectIdGetDatum(relationOid));
16598 416 : scan = systable_beginscan(attRelation, AttributeRelidNumIndexId,
16599 : true, NULL, 1, key);
16600 2937 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
16601 : {
16602 2521 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
16603 : Datum repl_val[Natts_pg_attribute];
16604 : bool repl_null[Natts_pg_attribute];
16605 : bool repl_repl[Natts_pg_attribute];
16606 : Acl *newAcl;
16607 : Datum aclDatum;
16608 : bool isNull;
16609 : HeapTuple newtuple;
16610 :
16611 : /* Ignore dropped columns */
16612 2521 : if (att->attisdropped)
16613 2520 : continue;
16614 :
16615 2521 : aclDatum = heap_getattr(attributeTuple,
16616 : Anum_pg_attribute_attacl,
16617 : RelationGetDescr(attRelation),
16618 : &isNull);
16619 : /* Null ACLs do not require changes */
16620 2521 : if (isNull)
16621 2520 : continue;
16622 :
16623 1 : memset(repl_null, false, sizeof(repl_null));
16624 1 : memset(repl_repl, false, sizeof(repl_repl));
16625 :
16626 1 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16627 : oldOwnerId, newOwnerId);
16628 1 : repl_repl[Anum_pg_attribute_attacl - 1] = true;
16629 1 : repl_val[Anum_pg_attribute_attacl - 1] = PointerGetDatum(newAcl);
16630 :
16631 1 : newtuple = heap_modify_tuple(attributeTuple,
16632 : RelationGetDescr(attRelation),
16633 : repl_val, repl_null, repl_repl);
16634 :
16635 1 : CatalogTupleUpdate(attRelation, &newtuple->t_self, newtuple);
16636 :
16637 1 : heap_freetuple(newtuple);
16638 : }
16639 416 : systable_endscan(scan);
16640 416 : table_close(attRelation, RowExclusiveLock);
16641 416 : }
16642 :
16643 : /*
16644 : * change_owner_recurse_to_sequences
16645 : *
16646 : * Helper function for ATExecChangeOwner. Examines pg_depend searching
16647 : * for sequences that are dependent on serial columns, and changes their
16648 : * ownership.
16649 : */
16650 : static void
16651 416 : change_owner_recurse_to_sequences(Oid relationOid, Oid newOwnerId, LOCKMODE lockmode)
16652 : {
16653 : Relation depRel;
16654 : SysScanDesc scan;
16655 : ScanKeyData key[2];
16656 : HeapTuple tup;
16657 :
16658 : /*
16659 : * SERIAL sequences are those having an auto dependency on one of the
16660 : * table's columns (we don't care *which* column, exactly).
16661 : */
16662 416 : depRel = table_open(DependRelationId, AccessShareLock);
16663 :
16664 416 : ScanKeyInit(&key[0],
16665 : Anum_pg_depend_refclassid,
16666 : BTEqualStrategyNumber, F_OIDEQ,
16667 : ObjectIdGetDatum(RelationRelationId));
16668 416 : ScanKeyInit(&key[1],
16669 : Anum_pg_depend_refobjid,
16670 : BTEqualStrategyNumber, F_OIDEQ,
16671 : ObjectIdGetDatum(relationOid));
16672 : /* we leave refobjsubid unspecified */
16673 :
16674 416 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
16675 : NULL, 2, key);
16676 :
16677 1344 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
16678 : {
16679 928 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
16680 : Relation seqRel;
16681 :
16682 : /* skip dependencies other than auto dependencies on columns */
16683 928 : if (depForm->refobjsubid == 0 ||
16684 399 : depForm->classid != RelationRelationId ||
16685 123 : depForm->objsubid != 0 ||
16686 123 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
16687 805 : continue;
16688 :
16689 : /* Use relation_open just in case it's an index */
16690 123 : seqRel = relation_open(depForm->objid, lockmode);
16691 :
16692 : /* skip non-sequence relations */
16693 123 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
16694 : {
16695 : /* No need to keep the lock */
16696 106 : relation_close(seqRel, lockmode);
16697 106 : continue;
16698 : }
16699 :
16700 : /* We don't need to close the sequence while we alter it. */
16701 17 : ATExecChangeOwner(depForm->objid, newOwnerId, true, lockmode);
16702 :
16703 : /* Now we can close it. Keep the lock till end of transaction. */
16704 17 : relation_close(seqRel, NoLock);
16705 : }
16706 :
16707 416 : systable_endscan(scan);
16708 :
16709 416 : relation_close(depRel, AccessShareLock);
16710 416 : }
16711 :
16712 : /*
16713 : * ALTER TABLE CLUSTER ON
16714 : *
16715 : * The only thing we have to do is to change the indisclustered bits.
16716 : *
16717 : * Return the address of the new clustering index.
16718 : */
16719 : static ObjectAddress
16720 39 : ATExecClusterOn(Relation rel, const char *indexName, LOCKMODE lockmode)
16721 : {
16722 : Oid indexOid;
16723 : ObjectAddress address;
16724 :
16725 39 : indexOid = get_relname_relid(indexName, rel->rd_rel->relnamespace);
16726 :
16727 39 : if (!OidIsValid(indexOid))
16728 0 : ereport(ERROR,
16729 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16730 : errmsg("index \"%s\" for table \"%s\" does not exist",
16731 : indexName, RelationGetRelationName(rel))));
16732 :
16733 : /* Check index is valid to cluster on */
16734 39 : check_index_is_clusterable(rel, indexOid, lockmode);
16735 :
16736 : /* And do the work */
16737 39 : mark_index_clustered(rel, indexOid, false);
16738 :
16739 39 : ObjectAddressSet(address,
16740 : RelationRelationId, indexOid);
16741 :
16742 39 : return address;
16743 : }
16744 :
16745 : /*
16746 : * ALTER TABLE SET WITHOUT CLUSTER
16747 : *
16748 : * We have to find any indexes on the table that have indisclustered bit
16749 : * set and turn it off.
16750 : */
16751 : static void
16752 8 : ATExecDropCluster(Relation rel, LOCKMODE lockmode)
16753 : {
16754 8 : mark_index_clustered(rel, InvalidOid, false);
16755 8 : }
16756 :
16757 : /*
16758 : * Preparation phase for SET ACCESS METHOD
16759 : *
16760 : * Check that the access method exists and determine whether a change is
16761 : * actually needed.
16762 : */
16763 : static void
16764 73 : ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname)
16765 : {
16766 : Oid amoid;
16767 :
16768 : /*
16769 : * Look up the access method name and check that it differs from the
16770 : * table's current AM. If DEFAULT was specified for a partitioned table
16771 : * (amname is NULL), set it to InvalidOid to reset the catalogued AM.
16772 : */
16773 73 : if (amname != NULL)
16774 49 : amoid = get_table_am_oid(amname, false);
16775 24 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
16776 12 : amoid = InvalidOid;
16777 : else
16778 12 : amoid = get_table_am_oid(default_table_access_method, false);
16779 :
16780 : /* if it's a match, phase 3 doesn't need to do anything */
16781 73 : if (rel->rd_rel->relam == amoid)
16782 8 : return;
16783 :
16784 : /* Save info for Phase 3 to do the real work */
16785 65 : tab->rewrite |= AT_REWRITE_ACCESS_METHOD;
16786 65 : tab->newAccessMethod = amoid;
16787 65 : tab->chgAccessMethod = true;
16788 : }
16789 :
16790 : /*
16791 : * Special handling of ALTER TABLE SET ACCESS METHOD for relations with no
16792 : * storage that have an interest in preserving AM.
16793 : *
16794 : * Since these have no storage, setting the access method is a catalog only
16795 : * operation.
16796 : */
16797 : static void
16798 29 : ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId)
16799 : {
16800 : Relation pg_class;
16801 : Oid oldAccessMethodId;
16802 : HeapTuple tuple;
16803 : Form_pg_class rd_rel;
16804 29 : Oid reloid = RelationGetRelid(rel);
16805 :
16806 : /*
16807 : * Shouldn't be called on relations having storage; these are processed in
16808 : * phase 3.
16809 : */
16810 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16811 :
16812 : /* Get a modifiable copy of the relation's pg_class row. */
16813 29 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
16814 :
16815 29 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(reloid));
16816 29 : if (!HeapTupleIsValid(tuple))
16817 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
16818 29 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
16819 :
16820 : /* Update the pg_class row. */
16821 29 : oldAccessMethodId = rd_rel->relam;
16822 29 : rd_rel->relam = newAccessMethodId;
16823 :
16824 : /* Leave if no update required */
16825 29 : if (rd_rel->relam == oldAccessMethodId)
16826 : {
16827 0 : heap_freetuple(tuple);
16828 0 : table_close(pg_class, RowExclusiveLock);
16829 0 : return;
16830 : }
16831 :
16832 29 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
16833 :
16834 : /*
16835 : * Update the dependency on the new access method. No dependency is added
16836 : * if the new access method is InvalidOid (default case). Be very careful
16837 : * that this has to compare the previous value stored in pg_class with the
16838 : * new one.
16839 : */
16840 29 : if (!OidIsValid(oldAccessMethodId) && OidIsValid(rd_rel->relam))
16841 13 : {
16842 : ObjectAddress relobj,
16843 : referenced;
16844 :
16845 : /*
16846 : * New access method is defined and there was no dependency
16847 : * previously, so record a new one.
16848 : */
16849 13 : ObjectAddressSet(relobj, RelationRelationId, reloid);
16850 13 : ObjectAddressSet(referenced, AccessMethodRelationId, rd_rel->relam);
16851 13 : recordDependencyOn(&relobj, &referenced, DEPENDENCY_NORMAL);
16852 : }
16853 16 : else if (OidIsValid(oldAccessMethodId) &&
16854 16 : !OidIsValid(rd_rel->relam))
16855 : {
16856 : /*
16857 : * There was an access method defined, and no new one, so just remove
16858 : * the existing dependency.
16859 : */
16860 8 : deleteDependencyRecordsForClass(RelationRelationId, reloid,
16861 : AccessMethodRelationId,
16862 : DEPENDENCY_NORMAL);
16863 : }
16864 : else
16865 : {
16866 : Assert(OidIsValid(oldAccessMethodId) &&
16867 : OidIsValid(rd_rel->relam));
16868 :
16869 : /* Both are valid, so update the dependency */
16870 8 : changeDependencyFor(RelationRelationId, reloid,
16871 : AccessMethodRelationId,
16872 : oldAccessMethodId, rd_rel->relam);
16873 : }
16874 :
16875 : /* make the relam and dependency changes visible */
16876 29 : CommandCounterIncrement();
16877 :
16878 29 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16879 :
16880 29 : heap_freetuple(tuple);
16881 29 : table_close(pg_class, RowExclusiveLock);
16882 : }
16883 :
16884 : /*
16885 : * ALTER TABLE SET TABLESPACE
16886 : */
16887 : static void
16888 98 : ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel, const char *tablespacename, LOCKMODE lockmode)
16889 : {
16890 : Oid tablespaceId;
16891 :
16892 : /* Check that the tablespace exists */
16893 98 : tablespaceId = get_tablespace_oid(tablespacename, false);
16894 :
16895 : /* Check permissions except when moving to database's default */
16896 98 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
16897 : {
16898 : AclResult aclresult;
16899 :
16900 43 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(), ACL_CREATE);
16901 43 : if (aclresult != ACLCHECK_OK)
16902 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE, tablespacename);
16903 : }
16904 :
16905 : /* Save info for Phase 3 to do the real work */
16906 98 : if (OidIsValid(tab->newTableSpace))
16907 0 : ereport(ERROR,
16908 : (errcode(ERRCODE_SYNTAX_ERROR),
16909 : errmsg("cannot have multiple SET TABLESPACE subcommands")));
16910 :
16911 98 : tab->newTableSpace = tablespaceId;
16912 98 : }
16913 :
16914 : /*
16915 : * Set, reset, or replace reloptions.
16916 : */
16917 : static void
16918 632 : ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
16919 : LOCKMODE lockmode)
16920 : {
16921 : Oid relid;
16922 : Relation pgclass;
16923 : HeapTuple tuple;
16924 : HeapTuple newtuple;
16925 : Datum datum;
16926 : Datum newOptions;
16927 : Datum repl_val[Natts_pg_class];
16928 : bool repl_null[Natts_pg_class];
16929 : bool repl_repl[Natts_pg_class];
16930 632 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
16931 :
16932 632 : if (defList == NIL && operation != AT_ReplaceRelOptions)
16933 0 : return; /* nothing to do */
16934 :
16935 632 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
16936 :
16937 : /* Fetch heap tuple */
16938 632 : relid = RelationGetRelid(rel);
16939 632 : tuple = SearchSysCacheLocked1(RELOID, ObjectIdGetDatum(relid));
16940 632 : if (!HeapTupleIsValid(tuple))
16941 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
16942 :
16943 632 : if (operation == AT_ReplaceRelOptions)
16944 : {
16945 : /*
16946 : * If we're supposed to replace the reloptions list, we just pretend
16947 : * there were none before.
16948 : */
16949 137 : datum = (Datum) 0;
16950 : }
16951 : else
16952 : {
16953 : bool isnull;
16954 :
16955 : /* Get the old reloptions */
16956 495 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16957 : &isnull);
16958 495 : if (isnull)
16959 306 : datum = (Datum) 0;
16960 : }
16961 :
16962 : /* Generate new proposed reloptions (text array) */
16963 632 : newOptions = transformRelOptions(datum, defList, NULL, validnsps, false,
16964 : operation == AT_ResetRelOptions);
16965 :
16966 : /* Validate */
16967 628 : switch (rel->rd_rel->relkind)
16968 : {
16969 348 : case RELKIND_RELATION:
16970 : case RELKIND_MATVIEW:
16971 348 : (void) heap_reloptions(rel->rd_rel->relkind, newOptions, true);
16972 348 : break;
16973 4 : case RELKIND_PARTITIONED_TABLE:
16974 4 : (void) partitioned_table_reloptions(newOptions, true);
16975 0 : break;
16976 205 : case RELKIND_VIEW:
16977 205 : (void) view_reloptions(newOptions, true);
16978 193 : break;
16979 71 : case RELKIND_INDEX:
16980 : case RELKIND_PARTITIONED_INDEX:
16981 71 : (void) index_reloptions(rel->rd_indam->amoptions, newOptions, true);
16982 57 : break;
16983 0 : case RELKIND_TOASTVALUE:
16984 : /* fall through to error -- shouldn't ever get here */
16985 : default:
16986 0 : ereport(ERROR,
16987 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16988 : errmsg("cannot set options for relation \"%s\"",
16989 : RelationGetRelationName(rel)),
16990 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
16991 : break;
16992 : }
16993 :
16994 : /* Special-case validation of view options */
16995 598 : if (rel->rd_rel->relkind == RELKIND_VIEW)
16996 : {
16997 193 : Query *view_query = get_view_query(rel);
16998 193 : List *view_options = untransformRelOptions(newOptions);
16999 : ListCell *cell;
17000 193 : bool check_option = false;
17001 :
17002 261 : foreach(cell, view_options)
17003 : {
17004 68 : DefElem *defel = (DefElem *) lfirst(cell);
17005 :
17006 68 : if (strcmp(defel->defname, "check_option") == 0)
17007 16 : check_option = true;
17008 : }
17009 :
17010 : /*
17011 : * If the check option is specified, look to see if the view is
17012 : * actually auto-updatable or not.
17013 : */
17014 193 : if (check_option)
17015 : {
17016 : const char *view_updatable_error =
17017 16 : view_query_is_auto_updatable(view_query, true);
17018 :
17019 16 : if (view_updatable_error)
17020 0 : ereport(ERROR,
17021 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
17022 : errmsg("WITH CHECK OPTION is supported only on automatically updatable views"),
17023 : errhint("%s", _(view_updatable_error))));
17024 : }
17025 : }
17026 :
17027 : /*
17028 : * All we need do here is update the pg_class row; the new options will be
17029 : * propagated into relcaches during post-commit cache inval.
17030 : */
17031 598 : memset(repl_val, 0, sizeof(repl_val));
17032 598 : memset(repl_null, false, sizeof(repl_null));
17033 598 : memset(repl_repl, false, sizeof(repl_repl));
17034 :
17035 598 : if (newOptions != (Datum) 0)
17036 396 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
17037 : else
17038 202 : repl_null[Anum_pg_class_reloptions - 1] = true;
17039 :
17040 598 : repl_repl[Anum_pg_class_reloptions - 1] = true;
17041 :
17042 598 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
17043 : repl_val, repl_null, repl_repl);
17044 :
17045 598 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
17046 598 : UnlockTuple(pgclass, &tuple->t_self, InplaceUpdateTupleLock);
17047 :
17048 598 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17049 :
17050 598 : heap_freetuple(newtuple);
17051 :
17052 598 : ReleaseSysCache(tuple);
17053 :
17054 : /* repeat the whole exercise for the toast table, if there's one */
17055 598 : if (OidIsValid(rel->rd_rel->reltoastrelid))
17056 : {
17057 : Relation toastrel;
17058 182 : Oid toastid = rel->rd_rel->reltoastrelid;
17059 :
17060 182 : toastrel = table_open(toastid, lockmode);
17061 :
17062 : /* Fetch heap tuple */
17063 182 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(toastid));
17064 182 : if (!HeapTupleIsValid(tuple))
17065 0 : elog(ERROR, "cache lookup failed for relation %u", toastid);
17066 :
17067 182 : if (operation == AT_ReplaceRelOptions)
17068 : {
17069 : /*
17070 : * If we're supposed to replace the reloptions list, we just
17071 : * pretend there were none before.
17072 : */
17073 0 : datum = (Datum) 0;
17074 : }
17075 : else
17076 : {
17077 : bool isnull;
17078 :
17079 : /* Get the old reloptions */
17080 182 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
17081 : &isnull);
17082 182 : if (isnull)
17083 158 : datum = (Datum) 0;
17084 : }
17085 :
17086 182 : newOptions = transformRelOptions(datum, defList, "toast", validnsps,
17087 : false, operation == AT_ResetRelOptions);
17088 :
17089 182 : (void) heap_reloptions(RELKIND_TOASTVALUE, newOptions, true);
17090 :
17091 182 : memset(repl_val, 0, sizeof(repl_val));
17092 182 : memset(repl_null, false, sizeof(repl_null));
17093 182 : memset(repl_repl, false, sizeof(repl_repl));
17094 :
17095 182 : if (newOptions != (Datum) 0)
17096 28 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
17097 : else
17098 154 : repl_null[Anum_pg_class_reloptions - 1] = true;
17099 :
17100 182 : repl_repl[Anum_pg_class_reloptions - 1] = true;
17101 :
17102 182 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
17103 : repl_val, repl_null, repl_repl);
17104 :
17105 182 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
17106 :
17107 182 : InvokeObjectPostAlterHookArg(RelationRelationId,
17108 : RelationGetRelid(toastrel), 0,
17109 : InvalidOid, true);
17110 :
17111 182 : heap_freetuple(newtuple);
17112 :
17113 182 : ReleaseSysCache(tuple);
17114 :
17115 182 : table_close(toastrel, NoLock);
17116 : }
17117 :
17118 598 : table_close(pgclass, RowExclusiveLock);
17119 : }
17120 :
17121 : /*
17122 : * Execute ALTER TABLE SET TABLESPACE for cases where there is no tuple
17123 : * rewriting to be done, so we just want to copy the data as fast as possible.
17124 : */
17125 : static void
17126 100 : ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode)
17127 : {
17128 : Relation rel;
17129 : Oid reltoastrelid;
17130 : RelFileNumber newrelfilenumber;
17131 : RelFileLocator newrlocator;
17132 100 : List *reltoastidxids = NIL;
17133 : ListCell *lc;
17134 :
17135 : /*
17136 : * Need lock here in case we are recursing to toast table or index
17137 : */
17138 100 : rel = relation_open(tableOid, lockmode);
17139 :
17140 : /* Check first if relation can be moved to new tablespace */
17141 100 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
17142 : {
17143 5 : InvokeObjectPostAlterHook(RelationRelationId,
17144 : RelationGetRelid(rel), 0);
17145 5 : relation_close(rel, NoLock);
17146 5 : return;
17147 : }
17148 :
17149 95 : reltoastrelid = rel->rd_rel->reltoastrelid;
17150 : /* Fetch the list of indexes on toast relation if necessary */
17151 95 : if (OidIsValid(reltoastrelid))
17152 : {
17153 13 : Relation toastRel = relation_open(reltoastrelid, lockmode);
17154 :
17155 13 : reltoastidxids = RelationGetIndexList(toastRel);
17156 13 : relation_close(toastRel, lockmode);
17157 : }
17158 :
17159 : /*
17160 : * Relfilenumbers are not unique in databases across tablespaces, so we
17161 : * need to allocate a new one in the new tablespace.
17162 : */
17163 95 : newrelfilenumber = GetNewRelFileNumber(newTableSpace, NULL,
17164 95 : rel->rd_rel->relpersistence);
17165 :
17166 : /* Open old and new relation */
17167 95 : newrlocator = rel->rd_locator;
17168 95 : newrlocator.relNumber = newrelfilenumber;
17169 95 : newrlocator.spcOid = newTableSpace;
17170 :
17171 : /* hand off to AM to actually create new rel storage and copy the data */
17172 95 : if (rel->rd_rel->relkind == RELKIND_INDEX)
17173 : {
17174 36 : index_copy_data(rel, newrlocator);
17175 : }
17176 : else
17177 : {
17178 : Assert(RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind));
17179 59 : table_relation_copy_data(rel, &newrlocator);
17180 : }
17181 :
17182 : /*
17183 : * Update the pg_class row.
17184 : *
17185 : * NB: This wouldn't work if ATExecSetTableSpace() were allowed to be
17186 : * executed on pg_class or its indexes (the above copy wouldn't contain
17187 : * the updated pg_class entry), but that's forbidden with
17188 : * CheckRelationTableSpaceMove().
17189 : */
17190 95 : SetRelationTableSpace(rel, newTableSpace, newrelfilenumber);
17191 :
17192 95 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17193 :
17194 95 : RelationAssumeNewRelfilelocator(rel);
17195 :
17196 95 : relation_close(rel, NoLock);
17197 :
17198 : /* Make sure the reltablespace change is visible */
17199 95 : CommandCounterIncrement();
17200 :
17201 : /* Move associated toast relation and/or indexes, too */
17202 95 : if (OidIsValid(reltoastrelid))
17203 13 : ATExecSetTableSpace(reltoastrelid, newTableSpace, lockmode);
17204 108 : foreach(lc, reltoastidxids)
17205 13 : ATExecSetTableSpace(lfirst_oid(lc), newTableSpace, lockmode);
17206 :
17207 : /* Clean up */
17208 95 : list_free(reltoastidxids);
17209 : }
17210 :
17211 : /*
17212 : * Special handling of ALTER TABLE SET TABLESPACE for relations with no
17213 : * storage that have an interest in preserving tablespace.
17214 : *
17215 : * Since these have no storage the tablespace can be updated with a simple
17216 : * metadata only operation to update the tablespace.
17217 : */
17218 : static void
17219 24 : ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace)
17220 : {
17221 : /*
17222 : * Shouldn't be called on relations having storage; these are processed in
17223 : * phase 3.
17224 : */
17225 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
17226 :
17227 : /* check if relation can be moved to its new tablespace */
17228 24 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
17229 : {
17230 0 : InvokeObjectPostAlterHook(RelationRelationId,
17231 : RelationGetRelid(rel),
17232 : 0);
17233 0 : return;
17234 : }
17235 :
17236 : /* Update can be done, so change reltablespace */
17237 20 : SetRelationTableSpace(rel, newTableSpace, InvalidOid);
17238 :
17239 20 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17240 :
17241 : /* Make sure the reltablespace change is visible */
17242 20 : CommandCounterIncrement();
17243 : }
17244 :
17245 : /*
17246 : * Alter Table ALL ... SET TABLESPACE
17247 : *
17248 : * Allows a user to move all objects of some type in a given tablespace in the
17249 : * current database to another tablespace. Objects can be chosen based on the
17250 : * owner of the object also, to allow users to move only their objects.
17251 : * The user must have CREATE rights on the new tablespace, as usual. The main
17252 : * permissions handling is done by the lower-level table move function.
17253 : *
17254 : * All to-be-moved objects are locked first. If NOWAIT is specified and the
17255 : * lock can't be acquired then we ereport(ERROR).
17256 : */
17257 : Oid
17258 15 : AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
17259 : {
17260 15 : List *relations = NIL;
17261 : ListCell *l;
17262 : ScanKeyData key[1];
17263 : Relation rel;
17264 : TableScanDesc scan;
17265 : HeapTuple tuple;
17266 : Oid orig_tablespaceoid;
17267 : Oid new_tablespaceoid;
17268 15 : List *role_oids = roleSpecsToIds(stmt->roles);
17269 :
17270 : /* Ensure we were not asked to move something we can't */
17271 15 : if (stmt->objtype != OBJECT_TABLE && stmt->objtype != OBJECT_INDEX &&
17272 6 : stmt->objtype != OBJECT_MATVIEW)
17273 0 : ereport(ERROR,
17274 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
17275 : errmsg("only tables, indexes, and materialized views exist in tablespaces")));
17276 :
17277 : /* Get the orig and new tablespace OIDs */
17278 15 : orig_tablespaceoid = get_tablespace_oid(stmt->orig_tablespacename, false);
17279 15 : new_tablespaceoid = get_tablespace_oid(stmt->new_tablespacename, false);
17280 :
17281 : /* Can't move shared relations in to or out of pg_global */
17282 : /* This is also checked by ATExecSetTableSpace, but nice to stop earlier */
17283 15 : if (orig_tablespaceoid == GLOBALTABLESPACE_OID ||
17284 : new_tablespaceoid == GLOBALTABLESPACE_OID)
17285 0 : ereport(ERROR,
17286 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
17287 : errmsg("cannot move relations in to or out of pg_global tablespace")));
17288 :
17289 : /*
17290 : * Must have CREATE rights on the new tablespace, unless it is the
17291 : * database default tablespace (which all users implicitly have CREATE
17292 : * rights on).
17293 : */
17294 15 : if (OidIsValid(new_tablespaceoid) && new_tablespaceoid != MyDatabaseTableSpace)
17295 : {
17296 : AclResult aclresult;
17297 :
17298 0 : aclresult = object_aclcheck(TableSpaceRelationId, new_tablespaceoid, GetUserId(),
17299 : ACL_CREATE);
17300 0 : if (aclresult != ACLCHECK_OK)
17301 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
17302 0 : get_tablespace_name(new_tablespaceoid));
17303 : }
17304 :
17305 : /*
17306 : * Now that the checks are done, check if we should set either to
17307 : * InvalidOid because it is our database's default tablespace.
17308 : */
17309 15 : if (orig_tablespaceoid == MyDatabaseTableSpace)
17310 0 : orig_tablespaceoid = InvalidOid;
17311 :
17312 15 : if (new_tablespaceoid == MyDatabaseTableSpace)
17313 15 : new_tablespaceoid = InvalidOid;
17314 :
17315 : /* no-op */
17316 15 : if (orig_tablespaceoid == new_tablespaceoid)
17317 0 : return new_tablespaceoid;
17318 :
17319 : /*
17320 : * Walk the list of objects in the tablespace and move them. This will
17321 : * only find objects in our database, of course.
17322 : */
17323 15 : ScanKeyInit(&key[0],
17324 : Anum_pg_class_reltablespace,
17325 : BTEqualStrategyNumber, F_OIDEQ,
17326 : ObjectIdGetDatum(orig_tablespaceoid));
17327 :
17328 15 : rel = table_open(RelationRelationId, AccessShareLock);
17329 15 : scan = table_beginscan_catalog(rel, 1, key);
17330 66 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
17331 : {
17332 51 : Form_pg_class relForm = (Form_pg_class) GETSTRUCT(tuple);
17333 51 : Oid relOid = relForm->oid;
17334 :
17335 : /*
17336 : * Do not move objects in pg_catalog as part of this, if an admin
17337 : * really wishes to do so, they can issue the individual ALTER
17338 : * commands directly.
17339 : *
17340 : * Also, explicitly avoid any shared tables, temp tables, or TOAST
17341 : * (TOAST will be moved with the main table).
17342 : */
17343 51 : if (IsCatalogNamespace(relForm->relnamespace) ||
17344 102 : relForm->relisshared ||
17345 102 : isAnyTempNamespace(relForm->relnamespace) ||
17346 51 : IsToastNamespace(relForm->relnamespace))
17347 0 : continue;
17348 :
17349 : /* Only move the object type requested */
17350 51 : if ((stmt->objtype == OBJECT_TABLE &&
17351 30 : relForm->relkind != RELKIND_RELATION &&
17352 18 : relForm->relkind != RELKIND_PARTITIONED_TABLE) ||
17353 33 : (stmt->objtype == OBJECT_INDEX &&
17354 18 : relForm->relkind != RELKIND_INDEX &&
17355 3 : relForm->relkind != RELKIND_PARTITIONED_INDEX) ||
17356 30 : (stmt->objtype == OBJECT_MATVIEW &&
17357 3 : relForm->relkind != RELKIND_MATVIEW))
17358 21 : continue;
17359 :
17360 : /* Check if we are only moving objects owned by certain roles */
17361 30 : if (role_oids != NIL && !list_member_oid(role_oids, relForm->relowner))
17362 0 : continue;
17363 :
17364 : /*
17365 : * Handle permissions-checking here since we are locking the tables
17366 : * and also to avoid doing a bunch of work only to fail part-way. Note
17367 : * that permissions will also be checked by AlterTableInternal().
17368 : *
17369 : * Caller must be considered an owner on the table to move it.
17370 : */
17371 30 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()))
17372 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relOid)),
17373 0 : NameStr(relForm->relname));
17374 :
17375 30 : if (stmt->nowait &&
17376 0 : !ConditionalLockRelationOid(relOid, AccessExclusiveLock))
17377 0 : ereport(ERROR,
17378 : (errcode(ERRCODE_OBJECT_IN_USE),
17379 : errmsg("aborting because lock on relation \"%s.%s\" is not available",
17380 : get_namespace_name(relForm->relnamespace),
17381 : NameStr(relForm->relname))));
17382 : else
17383 30 : LockRelationOid(relOid, AccessExclusiveLock);
17384 :
17385 : /* Add to our list of objects to move */
17386 30 : relations = lappend_oid(relations, relOid);
17387 : }
17388 :
17389 15 : table_endscan(scan);
17390 15 : table_close(rel, AccessShareLock);
17391 :
17392 15 : if (relations == NIL)
17393 6 : ereport(NOTICE,
17394 : (errcode(ERRCODE_NO_DATA_FOUND),
17395 : errmsg("no matching relations in tablespace \"%s\" found",
17396 : orig_tablespaceoid == InvalidOid ? "(database default)" :
17397 : get_tablespace_name(orig_tablespaceoid))));
17398 :
17399 : /* Everything is locked, loop through and move all of the relations. */
17400 45 : foreach(l, relations)
17401 : {
17402 30 : List *cmds = NIL;
17403 30 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
17404 :
17405 30 : cmd->subtype = AT_SetTableSpace;
17406 30 : cmd->name = stmt->new_tablespacename;
17407 :
17408 30 : cmds = lappend(cmds, cmd);
17409 :
17410 30 : EventTriggerAlterTableStart((Node *) stmt);
17411 : /* OID is set by AlterTableInternal */
17412 30 : AlterTableInternal(lfirst_oid(l), cmds, false);
17413 30 : EventTriggerAlterTableEnd();
17414 : }
17415 :
17416 15 : return new_tablespaceoid;
17417 : }
17418 :
17419 : static void
17420 36 : index_copy_data(Relation rel, RelFileLocator newrlocator)
17421 : {
17422 : SMgrRelation dstrel;
17423 :
17424 : /*
17425 : * Since we copy the file directly without looking at the shared buffers,
17426 : * we'd better first flush out any pages of the source relation that are
17427 : * in shared buffers. We assume no new changes will be made while we are
17428 : * holding exclusive lock on the rel.
17429 : */
17430 36 : FlushRelationBuffers(rel);
17431 :
17432 : /*
17433 : * Create and copy all forks of the relation, and schedule unlinking of
17434 : * old physical files.
17435 : *
17436 : * NOTE: any conflict in relfilenumber value will be caught in
17437 : * RelationCreateStorage().
17438 : */
17439 36 : dstrel = RelationCreateStorage(newrlocator, rel->rd_rel->relpersistence, true);
17440 :
17441 : /* copy main fork */
17442 36 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
17443 36 : rel->rd_rel->relpersistence);
17444 :
17445 : /* copy those extra forks that exist */
17446 36 : for (ForkNumber forkNum = MAIN_FORKNUM + 1;
17447 144 : forkNum <= MAX_FORKNUM; forkNum++)
17448 : {
17449 108 : if (smgrexists(RelationGetSmgr(rel), forkNum))
17450 : {
17451 0 : smgrcreate(dstrel, forkNum, false);
17452 :
17453 : /*
17454 : * WAL log creation if the relation is persistent, or this is the
17455 : * init fork of an unlogged relation.
17456 : */
17457 0 : if (RelationIsPermanent(rel) ||
17458 0 : (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
17459 : forkNum == INIT_FORKNUM))
17460 0 : log_smgrcreate(&newrlocator, forkNum);
17461 0 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, forkNum,
17462 0 : rel->rd_rel->relpersistence);
17463 : }
17464 : }
17465 :
17466 : /* drop old relation, and close new one */
17467 36 : RelationDropStorage(rel);
17468 36 : smgrclose(dstrel);
17469 36 : }
17470 :
17471 : /*
17472 : * ALTER TABLE ENABLE/DISABLE TRIGGER
17473 : *
17474 : * We just pass this off to trigger.c.
17475 : */
17476 : static void
17477 191 : ATExecEnableDisableTrigger(Relation rel, const char *trigname,
17478 : char fires_when, bool skip_system, bool recurse,
17479 : LOCKMODE lockmode)
17480 : {
17481 191 : EnableDisableTrigger(rel, trigname, InvalidOid,
17482 : fires_when, skip_system, recurse,
17483 : lockmode);
17484 :
17485 191 : InvokeObjectPostAlterHook(RelationRelationId,
17486 : RelationGetRelid(rel), 0);
17487 191 : }
17488 :
17489 : /*
17490 : * ALTER TABLE ENABLE/DISABLE RULE
17491 : *
17492 : * We just pass this off to rewriteDefine.c.
17493 : */
17494 : static void
17495 29 : ATExecEnableDisableRule(Relation rel, const char *rulename,
17496 : char fires_when, LOCKMODE lockmode)
17497 : {
17498 29 : EnableDisableRule(rel, rulename, fires_when);
17499 :
17500 29 : InvokeObjectPostAlterHook(RelationRelationId,
17501 : RelationGetRelid(rel), 0);
17502 29 : }
17503 :
17504 : /*
17505 : * Preparation phase of [NO] INHERIT
17506 : *
17507 : * Check the relation defined as a child.
17508 : */
17509 : static void
17510 378 : ATPrepChangeInherit(Relation child_rel)
17511 : {
17512 378 : if (child_rel->rd_rel->reloftype)
17513 8 : ereport(ERROR,
17514 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17515 : errmsg("cannot change inheritance of typed table")));
17516 :
17517 370 : if (child_rel->rd_rel->relispartition)
17518 12 : ereport(ERROR,
17519 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17520 : errmsg("cannot change inheritance of a partition")));
17521 358 : }
17522 :
17523 : /*
17524 : * ALTER TABLE INHERIT
17525 : *
17526 : * Return the address of the new parent relation.
17527 : */
17528 : static ObjectAddress
17529 289 : ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode)
17530 : {
17531 : Relation parent_rel;
17532 : List *children;
17533 : ObjectAddress address;
17534 : const char *trigger_name;
17535 :
17536 : /*
17537 : * A self-exclusive lock is needed here. See the similar case in
17538 : * MergeAttributes() for a full explanation.
17539 : */
17540 289 : parent_rel = table_openrv(parent, ShareUpdateExclusiveLock);
17541 :
17542 : /*
17543 : * Must be owner of both parent and child -- child was checked by
17544 : * ATSimplePermissions call in ATPrepCmd
17545 : */
17546 289 : ATSimplePermissions(AT_AddInherit, parent_rel,
17547 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
17548 :
17549 : /* Permanent rels cannot inherit from temporary ones */
17550 289 : if (parent_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17551 4 : child_rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
17552 0 : ereport(ERROR,
17553 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17554 : errmsg("cannot inherit from temporary relation \"%s\"",
17555 : RelationGetRelationName(parent_rel))));
17556 :
17557 : /* If parent rel is temp, it must belong to this session */
17558 289 : if (RELATION_IS_OTHER_TEMP(parent_rel))
17559 0 : ereport(ERROR,
17560 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17561 : errmsg("cannot inherit from temporary relation of another session")));
17562 :
17563 : /* Ditto for the child */
17564 289 : if (RELATION_IS_OTHER_TEMP(child_rel))
17565 0 : ereport(ERROR,
17566 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17567 : errmsg("cannot inherit to temporary relation of another session")));
17568 :
17569 : /* Prevent partitioned tables from becoming inheritance parents */
17570 289 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17571 4 : ereport(ERROR,
17572 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17573 : errmsg("cannot inherit from partitioned table \"%s\"",
17574 : parent->relname)));
17575 :
17576 : /* Likewise for partitions */
17577 285 : if (parent_rel->rd_rel->relispartition)
17578 4 : ereport(ERROR,
17579 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17580 : errmsg("cannot inherit from a partition")));
17581 :
17582 : /*
17583 : * Prevent circularity by seeing if proposed parent inherits from child.
17584 : * (In particular, this disallows making a rel inherit from itself.)
17585 : *
17586 : * This is not completely bulletproof because of race conditions: in
17587 : * multi-level inheritance trees, someone else could concurrently be
17588 : * making another inheritance link that closes the loop but does not join
17589 : * either of the rels we have locked. Preventing that seems to require
17590 : * exclusive locks on the entire inheritance tree, which is a cure worse
17591 : * than the disease. find_all_inheritors() will cope with circularity
17592 : * anyway, so don't sweat it too much.
17593 : *
17594 : * We use weakest lock we can on child's children, namely AccessShareLock.
17595 : */
17596 281 : children = find_all_inheritors(RelationGetRelid(child_rel),
17597 : AccessShareLock, NULL);
17598 :
17599 281 : if (list_member_oid(children, RelationGetRelid(parent_rel)))
17600 8 : ereport(ERROR,
17601 : (errcode(ERRCODE_DUPLICATE_TABLE),
17602 : errmsg("circular inheritance not allowed"),
17603 : errdetail("\"%s\" is already a child of \"%s\".",
17604 : parent->relname,
17605 : RelationGetRelationName(child_rel))));
17606 :
17607 : /*
17608 : * If child_rel has row-level triggers with transition tables, we
17609 : * currently don't allow it to become an inheritance child. See also
17610 : * prohibitions in ATExecAttachPartition() and CreateTrigger().
17611 : */
17612 273 : trigger_name = FindTriggerIncompatibleWithInheritance(child_rel->trigdesc);
17613 273 : if (trigger_name != NULL)
17614 4 : ereport(ERROR,
17615 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
17616 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming an inheritance child",
17617 : trigger_name, RelationGetRelationName(child_rel)),
17618 : errdetail("ROW triggers with transition tables are not supported in inheritance hierarchies.")));
17619 :
17620 : /* OK to create inheritance */
17621 269 : CreateInheritance(child_rel, parent_rel, false);
17622 :
17623 209 : ObjectAddressSet(address, RelationRelationId,
17624 : RelationGetRelid(parent_rel));
17625 :
17626 : /* keep our lock on the parent relation until commit */
17627 209 : table_close(parent_rel, NoLock);
17628 :
17629 209 : return address;
17630 : }
17631 :
17632 : /*
17633 : * CreateInheritance
17634 : * Catalog manipulation portion of creating inheritance between a child
17635 : * table and a parent table.
17636 : *
17637 : * This verifies that all the columns and check constraints of the parent
17638 : * appear in the child and that they have the same data types and expressions.
17639 : *
17640 : * Common to ATExecAddInherit() and ATExecAttachPartition().
17641 : */
17642 : static void
17643 2189 : CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition)
17644 : {
17645 : Relation catalogRelation;
17646 : SysScanDesc scan;
17647 : ScanKeyData key;
17648 : HeapTuple inheritsTuple;
17649 : int32 inhseqno;
17650 :
17651 : /* Note: get RowExclusiveLock because we will write pg_inherits below. */
17652 2189 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17653 :
17654 : /*
17655 : * Check for duplicates in the list of parents, and determine the highest
17656 : * inhseqno already present; we'll use the next one for the new parent.
17657 : * Also, if proposed child is a partition, it cannot already be
17658 : * inheriting.
17659 : *
17660 : * Note: we do not reject the case where the child already inherits from
17661 : * the parent indirectly; CREATE TABLE doesn't reject comparable cases.
17662 : */
17663 2189 : ScanKeyInit(&key,
17664 : Anum_pg_inherits_inhrelid,
17665 : BTEqualStrategyNumber, F_OIDEQ,
17666 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17667 2189 : scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId,
17668 : true, NULL, 1, &key);
17669 :
17670 : /* inhseqno sequences start at 1 */
17671 2189 : inhseqno = 0;
17672 2232 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17673 : {
17674 47 : Form_pg_inherits inh = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17675 :
17676 47 : if (inh->inhparent == RelationGetRelid(parent_rel))
17677 4 : ereport(ERROR,
17678 : (errcode(ERRCODE_DUPLICATE_TABLE),
17679 : errmsg("relation \"%s\" would be inherited from more than once",
17680 : RelationGetRelationName(parent_rel))));
17681 :
17682 43 : if (inh->inhseqno > inhseqno)
17683 43 : inhseqno = inh->inhseqno;
17684 : }
17685 2185 : systable_endscan(scan);
17686 :
17687 : /* Match up the columns and bump attinhcount as needed */
17688 2185 : MergeAttributesIntoExisting(child_rel, parent_rel, ispartition);
17689 :
17690 : /* Match up the constraints and bump coninhcount as needed */
17691 2097 : MergeConstraintsIntoExisting(child_rel, parent_rel);
17692 :
17693 : /*
17694 : * OK, it looks valid. Make the catalog entries that show inheritance.
17695 : */
17696 2057 : StoreCatalogInheritance1(RelationGetRelid(child_rel),
17697 : RelationGetRelid(parent_rel),
17698 : inhseqno + 1,
17699 : catalogRelation,
17700 2057 : parent_rel->rd_rel->relkind ==
17701 : RELKIND_PARTITIONED_TABLE);
17702 :
17703 : /* Now we're done with pg_inherits */
17704 2057 : table_close(catalogRelation, RowExclusiveLock);
17705 2057 : }
17706 :
17707 : /*
17708 : * Obtain the source-text form of the constraint expression for a check
17709 : * constraint, given its pg_constraint tuple
17710 : */
17711 : static char *
17712 272 : decompile_conbin(HeapTuple contup, TupleDesc tupdesc)
17713 : {
17714 : Form_pg_constraint con;
17715 : bool isnull;
17716 : Datum attr;
17717 : Datum expr;
17718 :
17719 272 : con = (Form_pg_constraint) GETSTRUCT(contup);
17720 272 : attr = heap_getattr(contup, Anum_pg_constraint_conbin, tupdesc, &isnull);
17721 272 : if (isnull)
17722 0 : elog(ERROR, "null conbin for constraint %u", con->oid);
17723 :
17724 272 : expr = DirectFunctionCall2(pg_get_expr, attr,
17725 : ObjectIdGetDatum(con->conrelid));
17726 272 : return TextDatumGetCString(expr);
17727 : }
17728 :
17729 : /*
17730 : * Determine whether two check constraints are functionally equivalent
17731 : *
17732 : * The test we apply is to see whether they reverse-compile to the same
17733 : * source string. This insulates us from issues like whether attributes
17734 : * have the same physical column numbers in parent and child relations.
17735 : *
17736 : * Note that we ignore enforceability as there are cases where constraints
17737 : * with differing enforceability are allowed.
17738 : */
17739 : static bool
17740 136 : constraints_equivalent(HeapTuple a, HeapTuple b, TupleDesc tupleDesc)
17741 : {
17742 136 : Form_pg_constraint acon = (Form_pg_constraint) GETSTRUCT(a);
17743 136 : Form_pg_constraint bcon = (Form_pg_constraint) GETSTRUCT(b);
17744 :
17745 136 : if (acon->condeferrable != bcon->condeferrable ||
17746 136 : acon->condeferred != bcon->condeferred ||
17747 136 : strcmp(decompile_conbin(a, tupleDesc),
17748 136 : decompile_conbin(b, tupleDesc)) != 0)
17749 4 : return false;
17750 : else
17751 132 : return true;
17752 : }
17753 :
17754 : /*
17755 : * Check columns in child table match up with columns in parent, and increment
17756 : * their attinhcount.
17757 : *
17758 : * Called by CreateInheritance
17759 : *
17760 : * Currently all parent columns must be found in child. Missing columns are an
17761 : * error. One day we might consider creating new columns like CREATE TABLE
17762 : * does. However, that is widely unpopular --- in the common use case of
17763 : * partitioned tables it's a foot-gun.
17764 : *
17765 : * The data type must match exactly. If the parent column is NOT NULL then
17766 : * the child must be as well. Defaults are not compared, however.
17767 : */
17768 : static void
17769 2185 : MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition)
17770 : {
17771 : Relation attrrel;
17772 : TupleDesc parent_desc;
17773 :
17774 2185 : attrrel = table_open(AttributeRelationId, RowExclusiveLock);
17775 2185 : parent_desc = RelationGetDescr(parent_rel);
17776 :
17777 7213 : for (AttrNumber parent_attno = 1; parent_attno <= parent_desc->natts; parent_attno++)
17778 : {
17779 5116 : Form_pg_attribute parent_att = TupleDescAttr(parent_desc, parent_attno - 1);
17780 5116 : char *parent_attname = NameStr(parent_att->attname);
17781 : HeapTuple tuple;
17782 :
17783 : /* Ignore dropped columns in the parent. */
17784 5116 : if (parent_att->attisdropped)
17785 180 : continue;
17786 :
17787 : /* Find same column in child (matching on column name). */
17788 4936 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(child_rel), parent_attname);
17789 4936 : if (HeapTupleIsValid(tuple))
17790 : {
17791 4928 : Form_pg_attribute child_att = (Form_pg_attribute) GETSTRUCT(tuple);
17792 :
17793 4928 : if (parent_att->atttypid != child_att->atttypid ||
17794 4924 : parent_att->atttypmod != child_att->atttypmod)
17795 8 : ereport(ERROR,
17796 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17797 : errmsg("child table \"%s\" has different type for column \"%s\"",
17798 : RelationGetRelationName(child_rel), parent_attname)));
17799 :
17800 4920 : if (parent_att->attcollation != child_att->attcollation)
17801 4 : ereport(ERROR,
17802 : (errcode(ERRCODE_COLLATION_MISMATCH),
17803 : errmsg("child table \"%s\" has different collation for column \"%s\"",
17804 : RelationGetRelationName(child_rel), parent_attname)));
17805 :
17806 : /*
17807 : * If the parent has a not-null constraint that's not NO INHERIT,
17808 : * make sure the child has one too.
17809 : *
17810 : * Other constraints are checked elsewhere.
17811 : */
17812 4916 : if (parent_att->attnotnull && !child_att->attnotnull)
17813 : {
17814 : HeapTuple contup;
17815 :
17816 32 : contup = findNotNullConstraintAttnum(RelationGetRelid(parent_rel),
17817 32 : parent_att->attnum);
17818 32 : if (HeapTupleIsValid(contup) &&
17819 32 : !((Form_pg_constraint) GETSTRUCT(contup))->connoinherit)
17820 20 : ereport(ERROR,
17821 : errcode(ERRCODE_DATATYPE_MISMATCH),
17822 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17823 : parent_attname, RelationGetRelationName(child_rel)));
17824 : }
17825 :
17826 : /*
17827 : * Child column must be generated if and only if parent column is.
17828 : */
17829 4896 : if (parent_att->attgenerated && !child_att->attgenerated)
17830 24 : ereport(ERROR,
17831 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17832 : errmsg("column \"%s\" in child table must be a generated column", parent_attname)));
17833 4872 : if (child_att->attgenerated && !parent_att->attgenerated)
17834 16 : ereport(ERROR,
17835 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17836 : errmsg("column \"%s\" in child table must not be a generated column", parent_attname)));
17837 :
17838 4856 : if (parent_att->attgenerated && child_att->attgenerated && child_att->attgenerated != parent_att->attgenerated)
17839 8 : ereport(ERROR,
17840 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17841 : errmsg("column \"%s\" inherits from generated column of different kind", parent_attname),
17842 : errdetail("Parent column is %s, child column is %s.",
17843 : parent_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
17844 : child_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
17845 :
17846 : /*
17847 : * Regular inheritance children are independent enough not to
17848 : * inherit identity columns. But partitions are integral part of
17849 : * a partitioned table and inherit identity column.
17850 : */
17851 4848 : if (ispartition)
17852 4371 : child_att->attidentity = parent_att->attidentity;
17853 :
17854 : /*
17855 : * OK, bump the child column's inheritance count. (If we fail
17856 : * later on, this change will just roll back.)
17857 : */
17858 4848 : if (pg_add_s16_overflow(child_att->attinhcount, 1,
17859 : &child_att->attinhcount))
17860 0 : ereport(ERROR,
17861 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17862 : errmsg("too many inheritance parents"));
17863 :
17864 : /*
17865 : * In case of partitions, we must enforce that value of attislocal
17866 : * is same in all partitions. (Note: there are only inherited
17867 : * attributes in partitions)
17868 : */
17869 4848 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17870 : {
17871 : Assert(child_att->attinhcount == 1);
17872 4371 : child_att->attislocal = false;
17873 : }
17874 :
17875 4848 : CatalogTupleUpdate(attrrel, &tuple->t_self, tuple);
17876 4848 : heap_freetuple(tuple);
17877 : }
17878 : else
17879 : {
17880 8 : ereport(ERROR,
17881 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17882 : errmsg("child table is missing column \"%s\"", parent_attname)));
17883 : }
17884 : }
17885 :
17886 2097 : table_close(attrrel, RowExclusiveLock);
17887 2097 : }
17888 :
17889 : /*
17890 : * Check constraints in child table match up with constraints in parent,
17891 : * and increment their coninhcount.
17892 : *
17893 : * Constraints that are marked ONLY in the parent are ignored.
17894 : *
17895 : * Called by CreateInheritance
17896 : *
17897 : * Currently all constraints in parent must be present in the child. One day we
17898 : * may consider adding new constraints like CREATE TABLE does.
17899 : *
17900 : * XXX This is O(N^2) which may be an issue with tables with hundreds of
17901 : * constraints. As long as tables have more like 10 constraints it shouldn't be
17902 : * a problem though. Even 100 constraints ought not be the end of the world.
17903 : *
17904 : * XXX See MergeWithExistingConstraint too if you change this code.
17905 : */
17906 : static void
17907 2097 : MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel)
17908 : {
17909 : Relation constraintrel;
17910 : SysScanDesc parent_scan;
17911 : ScanKeyData parent_key;
17912 : HeapTuple parent_tuple;
17913 2097 : Oid parent_relid = RelationGetRelid(parent_rel);
17914 : AttrMap *attmap;
17915 :
17916 2097 : constraintrel = table_open(ConstraintRelationId, RowExclusiveLock);
17917 :
17918 : /* Outer loop scans through the parent's constraint definitions */
17919 2097 : ScanKeyInit(&parent_key,
17920 : Anum_pg_constraint_conrelid,
17921 : BTEqualStrategyNumber, F_OIDEQ,
17922 : ObjectIdGetDatum(parent_relid));
17923 2097 : parent_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17924 : true, NULL, 1, &parent_key);
17925 :
17926 2097 : attmap = build_attrmap_by_name(RelationGetDescr(parent_rel),
17927 : RelationGetDescr(child_rel),
17928 : true);
17929 :
17930 3708 : while (HeapTupleIsValid(parent_tuple = systable_getnext(parent_scan)))
17931 : {
17932 1651 : Form_pg_constraint parent_con = (Form_pg_constraint) GETSTRUCT(parent_tuple);
17933 : SysScanDesc child_scan;
17934 : ScanKeyData child_key;
17935 : HeapTuple child_tuple;
17936 : AttrNumber parent_attno;
17937 1651 : bool found = false;
17938 :
17939 1651 : if (parent_con->contype != CONSTRAINT_CHECK &&
17940 1483 : parent_con->contype != CONSTRAINT_NOTNULL)
17941 770 : continue;
17942 :
17943 : /* if the parent's constraint is marked NO INHERIT, it's not inherited */
17944 913 : if (parent_con->connoinherit)
17945 32 : continue;
17946 :
17947 881 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17948 729 : parent_attno = extractNotNullColumn(parent_tuple);
17949 : else
17950 152 : parent_attno = InvalidAttrNumber;
17951 :
17952 : /* Search for a child constraint matching this one */
17953 881 : ScanKeyInit(&child_key,
17954 : Anum_pg_constraint_conrelid,
17955 : BTEqualStrategyNumber, F_OIDEQ,
17956 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17957 881 : child_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17958 : true, NULL, 1, &child_key);
17959 :
17960 1408 : while (HeapTupleIsValid(child_tuple = systable_getnext(child_scan)))
17961 : {
17962 1392 : Form_pg_constraint child_con = (Form_pg_constraint) GETSTRUCT(child_tuple);
17963 : HeapTuple child_copy;
17964 :
17965 1392 : if (child_con->contype != parent_con->contype)
17966 274 : continue;
17967 :
17968 : /*
17969 : * CHECK constraint are matched by constraint name, NOT NULL ones
17970 : * by attribute number.
17971 : */
17972 1118 : if (child_con->contype == CONSTRAINT_CHECK)
17973 : {
17974 262 : if (strcmp(NameStr(parent_con->conname),
17975 199 : NameStr(child_con->conname)) != 0)
17976 63 : continue;
17977 : }
17978 919 : else if (child_con->contype == CONSTRAINT_NOTNULL)
17979 : {
17980 : Form_pg_attribute parent_attr;
17981 : Form_pg_attribute child_attr;
17982 : AttrNumber child_attno;
17983 :
17984 919 : parent_attr = TupleDescAttr(parent_rel->rd_att, parent_attno - 1);
17985 919 : child_attno = extractNotNullColumn(child_tuple);
17986 919 : if (parent_attno != attmap->attnums[child_attno - 1])
17987 190 : continue;
17988 :
17989 729 : child_attr = TupleDescAttr(child_rel->rd_att, child_attno - 1);
17990 : /* there shouldn't be constraints on dropped columns */
17991 729 : if (parent_attr->attisdropped || child_attr->attisdropped)
17992 0 : elog(ERROR, "found not-null constraint on dropped columns");
17993 : }
17994 :
17995 865 : if (child_con->contype == CONSTRAINT_CHECK &&
17996 136 : !constraints_equivalent(parent_tuple, child_tuple, RelationGetDescr(constraintrel)))
17997 4 : ereport(ERROR,
17998 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17999 : errmsg("child table \"%s\" has different definition for check constraint \"%s\"",
18000 : RelationGetRelationName(child_rel), NameStr(parent_con->conname))));
18001 :
18002 : /*
18003 : * If the child constraint is "no inherit" then cannot merge
18004 : */
18005 861 : if (child_con->connoinherit)
18006 8 : ereport(ERROR,
18007 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
18008 : errmsg("constraint \"%s\" conflicts with non-inherited constraint on child table \"%s\"",
18009 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
18010 :
18011 : /*
18012 : * If the child constraint is "not valid" then cannot merge with a
18013 : * valid parent constraint
18014 : */
18015 853 : if (parent_con->convalidated && child_con->conenforced &&
18016 773 : !child_con->convalidated)
18017 8 : ereport(ERROR,
18018 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
18019 : errmsg("constraint \"%s\" conflicts with NOT VALID constraint on child table \"%s\"",
18020 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
18021 :
18022 : /*
18023 : * A NOT ENFORCED child constraint cannot be merged with an
18024 : * ENFORCED parent constraint. However, the reverse is allowed,
18025 : * where the child constraint is ENFORCED.
18026 : */
18027 845 : if (parent_con->conenforced && !child_con->conenforced)
18028 4 : ereport(ERROR,
18029 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
18030 : errmsg("constraint \"%s\" conflicts with NOT ENFORCED constraint on child table \"%s\"",
18031 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
18032 :
18033 : /*
18034 : * OK, bump the child constraint's inheritance count. (If we fail
18035 : * later on, this change will just roll back.)
18036 : */
18037 841 : child_copy = heap_copytuple(child_tuple);
18038 841 : child_con = (Form_pg_constraint) GETSTRUCT(child_copy);
18039 :
18040 841 : if (pg_add_s16_overflow(child_con->coninhcount, 1,
18041 : &child_con->coninhcount))
18042 0 : ereport(ERROR,
18043 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
18044 : errmsg("too many inheritance parents"));
18045 :
18046 : /*
18047 : * In case of partitions, an inherited constraint must be
18048 : * inherited only once since it cannot have multiple parents and
18049 : * it is never considered local.
18050 : */
18051 841 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
18052 : {
18053 : Assert(child_con->coninhcount == 1);
18054 750 : child_con->conislocal = false;
18055 : }
18056 :
18057 841 : CatalogTupleUpdate(constraintrel, &child_copy->t_self, child_copy);
18058 841 : heap_freetuple(child_copy);
18059 :
18060 841 : found = true;
18061 841 : break;
18062 : }
18063 :
18064 857 : systable_endscan(child_scan);
18065 :
18066 857 : if (!found)
18067 : {
18068 16 : if (parent_con->contype == CONSTRAINT_NOTNULL)
18069 0 : ereport(ERROR,
18070 : errcode(ERRCODE_DATATYPE_MISMATCH),
18071 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
18072 : get_attname(parent_relid,
18073 : extractNotNullColumn(parent_tuple),
18074 : false),
18075 : RelationGetRelationName(child_rel)));
18076 :
18077 16 : ereport(ERROR,
18078 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18079 : errmsg("child table is missing constraint \"%s\"",
18080 : NameStr(parent_con->conname))));
18081 : }
18082 : }
18083 :
18084 2057 : systable_endscan(parent_scan);
18085 2057 : table_close(constraintrel, RowExclusiveLock);
18086 2057 : }
18087 :
18088 : /*
18089 : * ALTER TABLE NO INHERIT
18090 : *
18091 : * Return value is the address of the relation that is no longer parent.
18092 : */
18093 : static ObjectAddress
18094 69 : ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode)
18095 : {
18096 : ObjectAddress address;
18097 : Relation parent_rel;
18098 :
18099 : /*
18100 : * AccessShareLock on the parent is probably enough, seeing that DROP
18101 : * TABLE doesn't lock parent tables at all. We need some lock since we'll
18102 : * be inspecting the parent's schema.
18103 : */
18104 69 : parent_rel = table_openrv(parent, AccessShareLock);
18105 :
18106 : /*
18107 : * We don't bother to check ownership of the parent table --- ownership of
18108 : * the child is presumed enough rights.
18109 : */
18110 :
18111 : /* Off to RemoveInheritance() where most of the work happens */
18112 69 : RemoveInheritance(rel, parent_rel, false);
18113 :
18114 65 : ObjectAddressSet(address, RelationRelationId,
18115 : RelationGetRelid(parent_rel));
18116 :
18117 : /* keep our lock on the parent relation until commit */
18118 65 : table_close(parent_rel, NoLock);
18119 :
18120 65 : return address;
18121 : }
18122 :
18123 : /*
18124 : * MarkInheritDetached
18125 : *
18126 : * Set inhdetachpending for a partition, for ATExecDetachPartition
18127 : * in concurrent mode. While at it, verify that no other partition is
18128 : * already pending detach.
18129 : */
18130 : static void
18131 75 : MarkInheritDetached(Relation child_rel, Relation parent_rel)
18132 : {
18133 : Relation catalogRelation;
18134 : SysScanDesc scan;
18135 : ScanKeyData key;
18136 : HeapTuple inheritsTuple;
18137 75 : bool found = false;
18138 :
18139 : Assert(parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
18140 :
18141 : /*
18142 : * Find pg_inherits entries by inhparent. (We need to scan them all in
18143 : * order to verify that no other partition is pending detach.)
18144 : */
18145 75 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
18146 75 : ScanKeyInit(&key,
18147 : Anum_pg_inherits_inhparent,
18148 : BTEqualStrategyNumber, F_OIDEQ,
18149 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
18150 75 : scan = systable_beginscan(catalogRelation, InheritsParentIndexId,
18151 : true, NULL, 1, &key);
18152 :
18153 294 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
18154 : {
18155 : Form_pg_inherits inhForm;
18156 :
18157 145 : inhForm = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
18158 145 : if (inhForm->inhdetachpending)
18159 1 : ereport(ERROR,
18160 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
18161 : errmsg("partition \"%s\" already pending detach in partitioned table \"%s.%s\"",
18162 : get_rel_name(inhForm->inhrelid),
18163 : get_namespace_name(parent_rel->rd_rel->relnamespace),
18164 : RelationGetRelationName(parent_rel)),
18165 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
18166 :
18167 144 : if (inhForm->inhrelid == RelationGetRelid(child_rel))
18168 : {
18169 : HeapTuple newtup;
18170 :
18171 74 : newtup = heap_copytuple(inheritsTuple);
18172 74 : ((Form_pg_inherits) GETSTRUCT(newtup))->inhdetachpending = true;
18173 :
18174 74 : CatalogTupleUpdate(catalogRelation,
18175 74 : &inheritsTuple->t_self,
18176 : newtup);
18177 74 : found = true;
18178 74 : heap_freetuple(newtup);
18179 : /* keep looking, to ensure we catch others pending detach */
18180 : }
18181 : }
18182 :
18183 : /* Done */
18184 74 : systable_endscan(scan);
18185 74 : table_close(catalogRelation, RowExclusiveLock);
18186 :
18187 74 : if (!found)
18188 0 : ereport(ERROR,
18189 : (errcode(ERRCODE_UNDEFINED_TABLE),
18190 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
18191 : RelationGetRelationName(child_rel),
18192 : RelationGetRelationName(parent_rel))));
18193 74 : }
18194 :
18195 : /*
18196 : * RemoveInheritance
18197 : *
18198 : * Drop a parent from the child's parents. This just adjusts the attinhcount
18199 : * and attislocal of the columns and removes the pg_inherit and pg_depend
18200 : * entries. expect_detached is passed down to DeleteInheritsTuple, q.v..
18201 : *
18202 : * If attinhcount goes to 0 then attislocal gets set to true. If it goes back
18203 : * up attislocal stays true, which means if a child is ever removed from a
18204 : * parent then its columns will never be automatically dropped which may
18205 : * surprise. But at least we'll never surprise by dropping columns someone
18206 : * isn't expecting to be dropped which would actually mean data loss.
18207 : *
18208 : * coninhcount and conislocal for inherited constraints are adjusted in
18209 : * exactly the same way.
18210 : *
18211 : * Common to ATExecDropInherit() and ATExecDetachPartition().
18212 : */
18213 : static void
18214 778 : RemoveInheritance(Relation child_rel, Relation parent_rel, bool expect_detached)
18215 : {
18216 : Relation catalogRelation;
18217 : SysScanDesc scan;
18218 : ScanKeyData key[3];
18219 : HeapTuple attributeTuple,
18220 : constraintTuple;
18221 : AttrMap *attmap;
18222 : List *connames;
18223 : List *nncolumns;
18224 : bool found;
18225 : bool is_partitioning;
18226 :
18227 778 : is_partitioning = (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
18228 :
18229 778 : found = DeleteInheritsTuple(RelationGetRelid(child_rel),
18230 : RelationGetRelid(parent_rel),
18231 : expect_detached,
18232 778 : RelationGetRelationName(child_rel));
18233 778 : if (!found)
18234 : {
18235 16 : if (is_partitioning)
18236 12 : ereport(ERROR,
18237 : (errcode(ERRCODE_UNDEFINED_TABLE),
18238 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
18239 : RelationGetRelationName(child_rel),
18240 : RelationGetRelationName(parent_rel))));
18241 : else
18242 4 : ereport(ERROR,
18243 : (errcode(ERRCODE_UNDEFINED_TABLE),
18244 : errmsg("relation \"%s\" is not a parent of relation \"%s\"",
18245 : RelationGetRelationName(parent_rel),
18246 : RelationGetRelationName(child_rel))));
18247 : }
18248 :
18249 : /*
18250 : * Search through child columns looking for ones matching parent rel
18251 : */
18252 762 : catalogRelation = table_open(AttributeRelationId, RowExclusiveLock);
18253 762 : ScanKeyInit(&key[0],
18254 : Anum_pg_attribute_attrelid,
18255 : BTEqualStrategyNumber, F_OIDEQ,
18256 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
18257 762 : scan = systable_beginscan(catalogRelation, AttributeRelidNumIndexId,
18258 : true, NULL, 1, key);
18259 7058 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
18260 : {
18261 6296 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
18262 :
18263 : /* Ignore if dropped or not inherited */
18264 6296 : if (att->attisdropped)
18265 28 : continue;
18266 6268 : if (att->attinhcount <= 0)
18267 4600 : continue;
18268 :
18269 1668 : if (SearchSysCacheExistsAttName(RelationGetRelid(parent_rel),
18270 1668 : NameStr(att->attname)))
18271 : {
18272 : /* Decrement inhcount and possibly set islocal to true */
18273 1632 : HeapTuple copyTuple = heap_copytuple(attributeTuple);
18274 1632 : Form_pg_attribute copy_att = (Form_pg_attribute) GETSTRUCT(copyTuple);
18275 :
18276 1632 : copy_att->attinhcount--;
18277 1632 : if (copy_att->attinhcount == 0)
18278 1612 : copy_att->attislocal = true;
18279 :
18280 1632 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18281 1632 : heap_freetuple(copyTuple);
18282 : }
18283 : }
18284 762 : systable_endscan(scan);
18285 762 : table_close(catalogRelation, RowExclusiveLock);
18286 :
18287 : /*
18288 : * Likewise, find inherited check and not-null constraints and disinherit
18289 : * them. To do this, we first need a list of the names of the parent's
18290 : * check constraints. (We cheat a bit by only checking for name matches,
18291 : * assuming that the expressions will match.)
18292 : *
18293 : * For NOT NULL columns, we store column numbers to match, mapping them in
18294 : * to the child rel's attribute numbers.
18295 : */
18296 762 : attmap = build_attrmap_by_name(RelationGetDescr(child_rel),
18297 : RelationGetDescr(parent_rel),
18298 : false);
18299 :
18300 762 : catalogRelation = table_open(ConstraintRelationId, RowExclusiveLock);
18301 762 : ScanKeyInit(&key[0],
18302 : Anum_pg_constraint_conrelid,
18303 : BTEqualStrategyNumber, F_OIDEQ,
18304 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
18305 762 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18306 : true, NULL, 1, key);
18307 :
18308 762 : connames = NIL;
18309 762 : nncolumns = NIL;
18310 :
18311 1459 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18312 : {
18313 697 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18314 :
18315 697 : if (con->connoinherit)
18316 152 : continue;
18317 :
18318 545 : if (con->contype == CONSTRAINT_CHECK)
18319 76 : connames = lappend(connames, pstrdup(NameStr(con->conname)));
18320 545 : if (con->contype == CONSTRAINT_NOTNULL)
18321 : {
18322 249 : AttrNumber parent_attno = extractNotNullColumn(constraintTuple);
18323 :
18324 249 : nncolumns = lappend_int(nncolumns, attmap->attnums[parent_attno - 1]);
18325 : }
18326 : }
18327 :
18328 762 : systable_endscan(scan);
18329 :
18330 : /* Now scan the child's constraints to find matches */
18331 762 : ScanKeyInit(&key[0],
18332 : Anum_pg_constraint_conrelid,
18333 : BTEqualStrategyNumber, F_OIDEQ,
18334 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
18335 762 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18336 : true, NULL, 1, key);
18337 :
18338 1455 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18339 : {
18340 693 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18341 693 : bool match = false;
18342 :
18343 : /*
18344 : * Match CHECK constraints by name, not-null constraints by column
18345 : * number, and ignore all others.
18346 : */
18347 693 : if (con->contype == CONSTRAINT_CHECK)
18348 : {
18349 228 : foreach_ptr(char, chkname, connames)
18350 : {
18351 80 : if (con->contype == CONSTRAINT_CHECK &&
18352 80 : strcmp(NameStr(con->conname), chkname) == 0)
18353 : {
18354 76 : match = true;
18355 76 : connames = foreach_delete_current(connames, chkname);
18356 76 : break;
18357 : }
18358 : }
18359 : }
18360 581 : else if (con->contype == CONSTRAINT_NOTNULL)
18361 : {
18362 289 : AttrNumber child_attno = extractNotNullColumn(constraintTuple);
18363 :
18364 582 : foreach_int(prevattno, nncolumns)
18365 : {
18366 253 : if (prevattno == child_attno)
18367 : {
18368 249 : match = true;
18369 249 : nncolumns = foreach_delete_current(nncolumns, prevattno);
18370 249 : break;
18371 : }
18372 : }
18373 : }
18374 : else
18375 292 : continue;
18376 :
18377 401 : if (match)
18378 : {
18379 : /* Decrement inhcount and possibly set islocal to true */
18380 325 : HeapTuple copyTuple = heap_copytuple(constraintTuple);
18381 325 : Form_pg_constraint copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
18382 :
18383 325 : if (copy_con->coninhcount <= 0) /* shouldn't happen */
18384 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
18385 : RelationGetRelid(child_rel), NameStr(copy_con->conname));
18386 :
18387 325 : copy_con->coninhcount--;
18388 325 : if (copy_con->coninhcount == 0)
18389 313 : copy_con->conislocal = true;
18390 :
18391 325 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18392 325 : heap_freetuple(copyTuple);
18393 : }
18394 : }
18395 :
18396 : /* We should have matched all constraints */
18397 762 : if (connames != NIL || nncolumns != NIL)
18398 0 : elog(ERROR, "%d unmatched constraints while removing inheritance from \"%s\" to \"%s\"",
18399 : list_length(connames) + list_length(nncolumns),
18400 : RelationGetRelationName(child_rel), RelationGetRelationName(parent_rel));
18401 :
18402 762 : systable_endscan(scan);
18403 762 : table_close(catalogRelation, RowExclusiveLock);
18404 :
18405 762 : drop_parent_dependency(RelationGetRelid(child_rel),
18406 : RelationRelationId,
18407 : RelationGetRelid(parent_rel),
18408 : child_dependency_type(is_partitioning));
18409 :
18410 : /*
18411 : * Post alter hook of this inherits. Since object_access_hook doesn't take
18412 : * multiple object identifiers, we relay oid of parent relation using
18413 : * auxiliary_id argument.
18414 : */
18415 762 : InvokeObjectPostAlterHookArg(InheritsRelationId,
18416 : RelationGetRelid(child_rel), 0,
18417 : RelationGetRelid(parent_rel), false);
18418 762 : }
18419 :
18420 : /*
18421 : * Drop the dependency created by StoreCatalogInheritance1 (CREATE TABLE
18422 : * INHERITS/ALTER TABLE INHERIT -- refclassid will be RelationRelationId) or
18423 : * heap_create_with_catalog (CREATE TABLE OF/ALTER TABLE OF -- refclassid will
18424 : * be TypeRelationId). There's no convenient way to do this, so go trawling
18425 : * through pg_depend.
18426 : */
18427 : static void
18428 770 : drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
18429 : DependencyType deptype)
18430 : {
18431 : Relation catalogRelation;
18432 : SysScanDesc scan;
18433 : ScanKeyData key[3];
18434 : HeapTuple depTuple;
18435 :
18436 770 : catalogRelation = table_open(DependRelationId, RowExclusiveLock);
18437 :
18438 770 : ScanKeyInit(&key[0],
18439 : Anum_pg_depend_classid,
18440 : BTEqualStrategyNumber, F_OIDEQ,
18441 : ObjectIdGetDatum(RelationRelationId));
18442 770 : ScanKeyInit(&key[1],
18443 : Anum_pg_depend_objid,
18444 : BTEqualStrategyNumber, F_OIDEQ,
18445 : ObjectIdGetDatum(relid));
18446 770 : ScanKeyInit(&key[2],
18447 : Anum_pg_depend_objsubid,
18448 : BTEqualStrategyNumber, F_INT4EQ,
18449 : Int32GetDatum(0));
18450 :
18451 770 : scan = systable_beginscan(catalogRelation, DependDependerIndexId, true,
18452 : NULL, 3, key);
18453 :
18454 2363 : while (HeapTupleIsValid(depTuple = systable_getnext(scan)))
18455 : {
18456 1593 : Form_pg_depend dep = (Form_pg_depend) GETSTRUCT(depTuple);
18457 :
18458 1593 : if (dep->refclassid == refclassid &&
18459 798 : dep->refobjid == refobjid &&
18460 770 : dep->refobjsubid == 0 &&
18461 770 : dep->deptype == deptype)
18462 770 : CatalogTupleDelete(catalogRelation, &depTuple->t_self);
18463 : }
18464 :
18465 770 : systable_endscan(scan);
18466 770 : table_close(catalogRelation, RowExclusiveLock);
18467 770 : }
18468 :
18469 : /*
18470 : * ALTER TABLE OF
18471 : *
18472 : * Attach a table to a composite type, as though it had been created with CREATE
18473 : * TABLE OF. All attname, atttypid, atttypmod and attcollation must match. The
18474 : * subject table must not have inheritance parents. These restrictions ensure
18475 : * that you cannot create a configuration impossible with CREATE TABLE OF alone.
18476 : *
18477 : * The address of the type is returned.
18478 : */
18479 : static ObjectAddress
18480 42 : ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode)
18481 : {
18482 42 : Oid relid = RelationGetRelid(rel);
18483 : Type typetuple;
18484 : Form_pg_type typeform;
18485 : Oid typeid;
18486 : Relation inheritsRelation,
18487 : relationRelation;
18488 : SysScanDesc scan;
18489 : ScanKeyData key;
18490 : AttrNumber table_attno,
18491 : type_attno;
18492 : TupleDesc typeTupleDesc,
18493 : tableTupleDesc;
18494 : ObjectAddress tableobj,
18495 : typeobj;
18496 : HeapTuple classtuple;
18497 :
18498 : /* Validate the type. */
18499 42 : typetuple = typenameType(NULL, ofTypename, NULL);
18500 42 : check_of_type(typetuple);
18501 42 : typeform = (Form_pg_type) GETSTRUCT(typetuple);
18502 42 : typeid = typeform->oid;
18503 :
18504 : /* Fail if the table has any inheritance parents. */
18505 42 : inheritsRelation = table_open(InheritsRelationId, AccessShareLock);
18506 42 : ScanKeyInit(&key,
18507 : Anum_pg_inherits_inhrelid,
18508 : BTEqualStrategyNumber, F_OIDEQ,
18509 : ObjectIdGetDatum(relid));
18510 42 : scan = systable_beginscan(inheritsRelation, InheritsRelidSeqnoIndexId,
18511 : true, NULL, 1, &key);
18512 42 : if (HeapTupleIsValid(systable_getnext(scan)))
18513 4 : ereport(ERROR,
18514 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18515 : errmsg("typed tables cannot inherit")));
18516 38 : systable_endscan(scan);
18517 38 : table_close(inheritsRelation, AccessShareLock);
18518 :
18519 : /*
18520 : * Check the tuple descriptors for compatibility. Unlike inheritance, we
18521 : * require that the order also match. However, attnotnull need not match.
18522 : */
18523 38 : typeTupleDesc = lookup_rowtype_tupdesc(typeid, -1);
18524 38 : tableTupleDesc = RelationGetDescr(rel);
18525 38 : table_attno = 1;
18526 121 : for (type_attno = 1; type_attno <= typeTupleDesc->natts; type_attno++)
18527 : {
18528 : Form_pg_attribute type_attr,
18529 : table_attr;
18530 : const char *type_attname,
18531 : *table_attname;
18532 :
18533 : /* Get the next non-dropped type attribute. */
18534 99 : type_attr = TupleDescAttr(typeTupleDesc, type_attno - 1);
18535 99 : if (type_attr->attisdropped)
18536 29 : continue;
18537 70 : type_attname = NameStr(type_attr->attname);
18538 :
18539 : /* Get the next non-dropped table attribute. */
18540 : do
18541 : {
18542 78 : if (table_attno > tableTupleDesc->natts)
18543 4 : ereport(ERROR,
18544 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18545 : errmsg("table is missing column \"%s\"",
18546 : type_attname)));
18547 74 : table_attr = TupleDescAttr(tableTupleDesc, table_attno - 1);
18548 74 : table_attno++;
18549 74 : } while (table_attr->attisdropped);
18550 66 : table_attname = NameStr(table_attr->attname);
18551 :
18552 : /* Compare name. */
18553 66 : if (strncmp(table_attname, type_attname, NAMEDATALEN) != 0)
18554 4 : ereport(ERROR,
18555 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18556 : errmsg("table has column \"%s\" where type requires \"%s\"",
18557 : table_attname, type_attname)));
18558 :
18559 : /* Compare type. */
18560 62 : if (table_attr->atttypid != type_attr->atttypid ||
18561 58 : table_attr->atttypmod != type_attr->atttypmod ||
18562 54 : table_attr->attcollation != type_attr->attcollation)
18563 8 : ereport(ERROR,
18564 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18565 : errmsg("table \"%s\" has different type for column \"%s\"",
18566 : RelationGetRelationName(rel), type_attname)));
18567 : }
18568 22 : ReleaseTupleDesc(typeTupleDesc);
18569 :
18570 : /* Any remaining columns at the end of the table had better be dropped. */
18571 22 : for (; table_attno <= tableTupleDesc->natts; table_attno++)
18572 : {
18573 4 : Form_pg_attribute table_attr = TupleDescAttr(tableTupleDesc,
18574 : table_attno - 1);
18575 :
18576 4 : if (!table_attr->attisdropped)
18577 4 : ereport(ERROR,
18578 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18579 : errmsg("table has extra column \"%s\"",
18580 : NameStr(table_attr->attname))));
18581 : }
18582 :
18583 : /* If the table was already typed, drop the existing dependency. */
18584 18 : if (rel->rd_rel->reloftype)
18585 4 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18586 : DEPENDENCY_NORMAL);
18587 :
18588 : /* Record a dependency on the new type. */
18589 18 : tableobj.classId = RelationRelationId;
18590 18 : tableobj.objectId = relid;
18591 18 : tableobj.objectSubId = 0;
18592 18 : typeobj.classId = TypeRelationId;
18593 18 : typeobj.objectId = typeid;
18594 18 : typeobj.objectSubId = 0;
18595 18 : recordDependencyOn(&tableobj, &typeobj, DEPENDENCY_NORMAL);
18596 :
18597 : /* Update pg_class.reloftype */
18598 18 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18599 18 : classtuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18600 18 : if (!HeapTupleIsValid(classtuple))
18601 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18602 18 : ((Form_pg_class) GETSTRUCT(classtuple))->reloftype = typeid;
18603 18 : CatalogTupleUpdate(relationRelation, &classtuple->t_self, classtuple);
18604 :
18605 18 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18606 :
18607 18 : heap_freetuple(classtuple);
18608 18 : table_close(relationRelation, RowExclusiveLock);
18609 :
18610 18 : ReleaseSysCache(typetuple);
18611 :
18612 18 : return typeobj;
18613 : }
18614 :
18615 : /*
18616 : * ALTER TABLE NOT OF
18617 : *
18618 : * Detach a typed table from its originating type. Just clear reloftype and
18619 : * remove the dependency.
18620 : */
18621 : static void
18622 4 : ATExecDropOf(Relation rel, LOCKMODE lockmode)
18623 : {
18624 4 : Oid relid = RelationGetRelid(rel);
18625 : Relation relationRelation;
18626 : HeapTuple tuple;
18627 :
18628 4 : if (!OidIsValid(rel->rd_rel->reloftype))
18629 0 : ereport(ERROR,
18630 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18631 : errmsg("\"%s\" is not a typed table",
18632 : RelationGetRelationName(rel))));
18633 :
18634 : /*
18635 : * We don't bother to check ownership of the type --- ownership of the
18636 : * table is presumed enough rights. No lock required on the type, either.
18637 : */
18638 :
18639 4 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18640 : DEPENDENCY_NORMAL);
18641 :
18642 : /* Clear pg_class.reloftype */
18643 4 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18644 4 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18645 4 : if (!HeapTupleIsValid(tuple))
18646 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18647 4 : ((Form_pg_class) GETSTRUCT(tuple))->reloftype = InvalidOid;
18648 4 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
18649 :
18650 4 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18651 :
18652 4 : heap_freetuple(tuple);
18653 4 : table_close(relationRelation, RowExclusiveLock);
18654 4 : }
18655 :
18656 : /*
18657 : * relation_mark_replica_identity: Update a table's replica identity
18658 : *
18659 : * Iff ri_type = REPLICA_IDENTITY_INDEX, indexOid must be the Oid of a suitable
18660 : * index. Otherwise, it must be InvalidOid.
18661 : *
18662 : * Caller had better hold an exclusive lock on the relation, as the results
18663 : * of running two of these concurrently wouldn't be pretty.
18664 : */
18665 : static void
18666 290 : relation_mark_replica_identity(Relation rel, char ri_type, Oid indexOid,
18667 : bool is_internal)
18668 : {
18669 : Relation pg_index;
18670 : Relation pg_class;
18671 : HeapTuple pg_class_tuple;
18672 : HeapTuple pg_index_tuple;
18673 : Form_pg_class pg_class_form;
18674 : Form_pg_index pg_index_form;
18675 : ListCell *index;
18676 :
18677 : /*
18678 : * Check whether relreplident has changed, and update it if so.
18679 : */
18680 290 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18681 290 : pg_class_tuple = SearchSysCacheCopy1(RELOID,
18682 : ObjectIdGetDatum(RelationGetRelid(rel)));
18683 290 : if (!HeapTupleIsValid(pg_class_tuple))
18684 0 : elog(ERROR, "cache lookup failed for relation \"%s\"",
18685 : RelationGetRelationName(rel));
18686 290 : pg_class_form = (Form_pg_class) GETSTRUCT(pg_class_tuple);
18687 290 : if (pg_class_form->relreplident != ri_type)
18688 : {
18689 257 : pg_class_form->relreplident = ri_type;
18690 257 : CatalogTupleUpdate(pg_class, &pg_class_tuple->t_self, pg_class_tuple);
18691 : }
18692 290 : table_close(pg_class, RowExclusiveLock);
18693 290 : heap_freetuple(pg_class_tuple);
18694 :
18695 : /*
18696 : * Update the per-index indisreplident flags correctly.
18697 : */
18698 290 : pg_index = table_open(IndexRelationId, RowExclusiveLock);
18699 762 : foreach(index, RelationGetIndexList(rel))
18700 : {
18701 472 : Oid thisIndexOid = lfirst_oid(index);
18702 472 : bool dirty = false;
18703 :
18704 472 : pg_index_tuple = SearchSysCacheCopy1(INDEXRELID,
18705 : ObjectIdGetDatum(thisIndexOid));
18706 472 : if (!HeapTupleIsValid(pg_index_tuple))
18707 0 : elog(ERROR, "cache lookup failed for index %u", thisIndexOid);
18708 472 : pg_index_form = (Form_pg_index) GETSTRUCT(pg_index_tuple);
18709 :
18710 472 : if (thisIndexOid == indexOid)
18711 : {
18712 : /* Set the bit if not already set. */
18713 151 : if (!pg_index_form->indisreplident)
18714 : {
18715 139 : dirty = true;
18716 139 : pg_index_form->indisreplident = true;
18717 : }
18718 : }
18719 : else
18720 : {
18721 : /* Unset the bit if set. */
18722 321 : if (pg_index_form->indisreplident)
18723 : {
18724 34 : dirty = true;
18725 34 : pg_index_form->indisreplident = false;
18726 : }
18727 : }
18728 :
18729 472 : if (dirty)
18730 : {
18731 173 : CatalogTupleUpdate(pg_index, &pg_index_tuple->t_self, pg_index_tuple);
18732 173 : InvokeObjectPostAlterHookArg(IndexRelationId, thisIndexOid, 0,
18733 : InvalidOid, is_internal);
18734 :
18735 : /*
18736 : * Invalidate the relcache for the table, so that after we commit
18737 : * all sessions will refresh the table's replica identity index
18738 : * before attempting any UPDATE or DELETE on the table. (If we
18739 : * changed the table's pg_class row above, then a relcache inval
18740 : * is already queued due to that; but we might not have.)
18741 : */
18742 173 : CacheInvalidateRelcache(rel);
18743 : }
18744 472 : heap_freetuple(pg_index_tuple);
18745 : }
18746 :
18747 290 : table_close(pg_index, RowExclusiveLock);
18748 290 : }
18749 :
18750 : /*
18751 : * ALTER TABLE <name> REPLICA IDENTITY ...
18752 : */
18753 : static void
18754 322 : ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode)
18755 : {
18756 : Oid indexOid;
18757 : Relation indexRel;
18758 : int key;
18759 :
18760 322 : if (stmt->identity_type == REPLICA_IDENTITY_DEFAULT)
18761 : {
18762 8 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18763 8 : return;
18764 : }
18765 314 : else if (stmt->identity_type == REPLICA_IDENTITY_FULL)
18766 : {
18767 98 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18768 98 : return;
18769 : }
18770 216 : else if (stmt->identity_type == REPLICA_IDENTITY_NOTHING)
18771 : {
18772 33 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18773 33 : return;
18774 : }
18775 183 : else if (stmt->identity_type == REPLICA_IDENTITY_INDEX)
18776 : {
18777 : /* fallthrough */ ;
18778 : }
18779 : else
18780 0 : elog(ERROR, "unexpected identity type %u", stmt->identity_type);
18781 :
18782 : /* Check that the index exists */
18783 183 : indexOid = get_relname_relid(stmt->name, rel->rd_rel->relnamespace);
18784 183 : if (!OidIsValid(indexOid))
18785 0 : ereport(ERROR,
18786 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18787 : errmsg("index \"%s\" for table \"%s\" does not exist",
18788 : stmt->name, RelationGetRelationName(rel))));
18789 :
18790 183 : indexRel = index_open(indexOid, ShareLock);
18791 :
18792 : /* Check that the index is on the relation we're altering. */
18793 183 : if (indexRel->rd_index == NULL ||
18794 183 : indexRel->rd_index->indrelid != RelationGetRelid(rel))
18795 4 : ereport(ERROR,
18796 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18797 : errmsg("\"%s\" is not an index for table \"%s\"",
18798 : RelationGetRelationName(indexRel),
18799 : RelationGetRelationName(rel))));
18800 :
18801 : /*
18802 : * The AM must support uniqueness, and the index must in fact be unique.
18803 : * If we have a WITHOUT OVERLAPS constraint (identified by uniqueness +
18804 : * exclusion), we can use that too.
18805 : */
18806 179 : if ((!indexRel->rd_indam->amcanunique ||
18807 167 : !indexRel->rd_index->indisunique) &&
18808 16 : !(indexRel->rd_index->indisunique && indexRel->rd_index->indisexclusion))
18809 8 : ereport(ERROR,
18810 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18811 : errmsg("cannot use non-unique index \"%s\" as replica identity",
18812 : RelationGetRelationName(indexRel))));
18813 : /* Deferred indexes are not guaranteed to be always unique. */
18814 171 : if (!indexRel->rd_index->indimmediate)
18815 8 : ereport(ERROR,
18816 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18817 : errmsg("cannot use non-immediate index \"%s\" as replica identity",
18818 : RelationGetRelationName(indexRel))));
18819 : /* Expression indexes aren't supported. */
18820 163 : if (RelationGetIndexExpressions(indexRel) != NIL)
18821 4 : ereport(ERROR,
18822 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18823 : errmsg("cannot use expression index \"%s\" as replica identity",
18824 : RelationGetRelationName(indexRel))));
18825 : /* Predicate indexes aren't supported. */
18826 159 : if (RelationGetIndexPredicate(indexRel) != NIL)
18827 4 : ereport(ERROR,
18828 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18829 : errmsg("cannot use partial index \"%s\" as replica identity",
18830 : RelationGetRelationName(indexRel))));
18831 :
18832 : /* Check index for nullable columns. */
18833 348 : for (key = 0; key < IndexRelationGetNumberOfKeyAttributes(indexRel); key++)
18834 : {
18835 197 : int16 attno = indexRel->rd_index->indkey.values[key];
18836 : Form_pg_attribute attr;
18837 :
18838 : /*
18839 : * Reject any other system columns. (Going forward, we'll disallow
18840 : * indexes containing such columns in the first place, but they might
18841 : * exist in older branches.)
18842 : */
18843 197 : if (attno <= 0)
18844 0 : ereport(ERROR,
18845 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
18846 : errmsg("index \"%s\" cannot be used as replica identity because column %d is a system column",
18847 : RelationGetRelationName(indexRel), attno)));
18848 :
18849 197 : attr = TupleDescAttr(rel->rd_att, attno - 1);
18850 197 : if (!attr->attnotnull)
18851 4 : ereport(ERROR,
18852 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18853 : errmsg("index \"%s\" cannot be used as replica identity because column \"%s\" is nullable",
18854 : RelationGetRelationName(indexRel),
18855 : NameStr(attr->attname))));
18856 : }
18857 :
18858 : /* This index is suitable for use as a replica identity. Mark it. */
18859 151 : relation_mark_replica_identity(rel, stmt->identity_type, indexOid, true);
18860 :
18861 151 : index_close(indexRel, NoLock);
18862 : }
18863 :
18864 : /*
18865 : * ALTER TABLE ENABLE/DISABLE ROW LEVEL SECURITY
18866 : */
18867 : static void
18868 246 : ATExecSetRowSecurity(Relation rel, bool rls)
18869 : {
18870 : Relation pg_class;
18871 : Oid relid;
18872 : HeapTuple tuple;
18873 :
18874 246 : relid = RelationGetRelid(rel);
18875 :
18876 : /* Pull the record for this relation and update it */
18877 246 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18878 :
18879 246 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18880 :
18881 246 : if (!HeapTupleIsValid(tuple))
18882 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18883 :
18884 246 : ((Form_pg_class) GETSTRUCT(tuple))->relrowsecurity = rls;
18885 246 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18886 :
18887 246 : InvokeObjectPostAlterHook(RelationRelationId,
18888 : RelationGetRelid(rel), 0);
18889 :
18890 246 : table_close(pg_class, RowExclusiveLock);
18891 246 : heap_freetuple(tuple);
18892 246 : }
18893 :
18894 : /*
18895 : * ALTER TABLE FORCE/NO FORCE ROW LEVEL SECURITY
18896 : */
18897 : static void
18898 90 : ATExecForceNoForceRowSecurity(Relation rel, bool force_rls)
18899 : {
18900 : Relation pg_class;
18901 : Oid relid;
18902 : HeapTuple tuple;
18903 :
18904 90 : relid = RelationGetRelid(rel);
18905 :
18906 90 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18907 :
18908 90 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18909 :
18910 90 : if (!HeapTupleIsValid(tuple))
18911 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18912 :
18913 90 : ((Form_pg_class) GETSTRUCT(tuple))->relforcerowsecurity = force_rls;
18914 90 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18915 :
18916 90 : InvokeObjectPostAlterHook(RelationRelationId,
18917 : RelationGetRelid(rel), 0);
18918 :
18919 90 : table_close(pg_class, RowExclusiveLock);
18920 90 : heap_freetuple(tuple);
18921 90 : }
18922 :
18923 : /*
18924 : * ALTER FOREIGN TABLE <name> OPTIONS (...)
18925 : */
18926 : static void
18927 33 : ATExecGenericOptions(Relation rel, List *options)
18928 : {
18929 : Relation ftrel;
18930 : ForeignServer *server;
18931 : ForeignDataWrapper *fdw;
18932 : HeapTuple tuple;
18933 : bool isnull;
18934 : Datum repl_val[Natts_pg_foreign_table];
18935 : bool repl_null[Natts_pg_foreign_table];
18936 : bool repl_repl[Natts_pg_foreign_table];
18937 : Datum datum;
18938 : Form_pg_foreign_table tableform;
18939 :
18940 33 : if (options == NIL)
18941 0 : return;
18942 :
18943 33 : ftrel = table_open(ForeignTableRelationId, RowExclusiveLock);
18944 :
18945 33 : tuple = SearchSysCacheCopy1(FOREIGNTABLEREL,
18946 : ObjectIdGetDatum(rel->rd_id));
18947 33 : if (!HeapTupleIsValid(tuple))
18948 0 : ereport(ERROR,
18949 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18950 : errmsg("foreign table \"%s\" does not exist",
18951 : RelationGetRelationName(rel))));
18952 33 : tableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
18953 33 : server = GetForeignServer(tableform->ftserver);
18954 33 : fdw = GetForeignDataWrapper(server->fdwid);
18955 :
18956 33 : memset(repl_val, 0, sizeof(repl_val));
18957 33 : memset(repl_null, false, sizeof(repl_null));
18958 33 : memset(repl_repl, false, sizeof(repl_repl));
18959 :
18960 : /* Extract the current options */
18961 33 : datum = SysCacheGetAttr(FOREIGNTABLEREL,
18962 : tuple,
18963 : Anum_pg_foreign_table_ftoptions,
18964 : &isnull);
18965 33 : if (isnull)
18966 2 : datum = PointerGetDatum(NULL);
18967 :
18968 : /* Transform the options */
18969 33 : datum = transformGenericOptions(ForeignTableRelationId,
18970 : datum,
18971 : options,
18972 : fdw->fdwvalidator);
18973 :
18974 32 : if (DatumGetPointer(datum) != NULL)
18975 32 : repl_val[Anum_pg_foreign_table_ftoptions - 1] = datum;
18976 : else
18977 0 : repl_null[Anum_pg_foreign_table_ftoptions - 1] = true;
18978 :
18979 32 : repl_repl[Anum_pg_foreign_table_ftoptions - 1] = true;
18980 :
18981 : /* Everything looks good - update the tuple */
18982 :
18983 32 : tuple = heap_modify_tuple(tuple, RelationGetDescr(ftrel),
18984 : repl_val, repl_null, repl_repl);
18985 :
18986 32 : CatalogTupleUpdate(ftrel, &tuple->t_self, tuple);
18987 :
18988 : /*
18989 : * Invalidate relcache so that all sessions will refresh any cached plans
18990 : * that might depend on the old options.
18991 : */
18992 32 : CacheInvalidateRelcache(rel);
18993 :
18994 32 : InvokeObjectPostAlterHook(ForeignTableRelationId,
18995 : RelationGetRelid(rel), 0);
18996 :
18997 32 : table_close(ftrel, RowExclusiveLock);
18998 :
18999 32 : heap_freetuple(tuple);
19000 : }
19001 :
19002 : /*
19003 : * ALTER TABLE ALTER COLUMN SET COMPRESSION
19004 : *
19005 : * Return value is the address of the modified column
19006 : */
19007 : static ObjectAddress
19008 48 : ATExecSetCompression(Relation rel,
19009 : const char *column,
19010 : Node *newValue,
19011 : LOCKMODE lockmode)
19012 : {
19013 : Relation attrel;
19014 : HeapTuple tuple;
19015 : Form_pg_attribute atttableform;
19016 : AttrNumber attnum;
19017 : char *compression;
19018 : char cmethod;
19019 : ObjectAddress address;
19020 :
19021 48 : compression = strVal(newValue);
19022 :
19023 48 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
19024 :
19025 : /* copy the cache entry so we can scribble on it below */
19026 48 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), column);
19027 48 : if (!HeapTupleIsValid(tuple))
19028 0 : ereport(ERROR,
19029 : (errcode(ERRCODE_UNDEFINED_COLUMN),
19030 : errmsg("column \"%s\" of relation \"%s\" does not exist",
19031 : column, RelationGetRelationName(rel))));
19032 :
19033 : /* prevent them from altering a system attribute */
19034 48 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
19035 48 : attnum = atttableform->attnum;
19036 48 : if (attnum <= 0)
19037 0 : ereport(ERROR,
19038 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
19039 : errmsg("cannot alter system column \"%s\"", column)));
19040 :
19041 : /*
19042 : * Check that column type is compressible, then get the attribute
19043 : * compression method code
19044 : */
19045 48 : cmethod = GetAttributeCompression(atttableform->atttypid, compression);
19046 :
19047 : /* update pg_attribute entry */
19048 44 : atttableform->attcompression = cmethod;
19049 44 : CatalogTupleUpdate(attrel, &tuple->t_self, tuple);
19050 :
19051 44 : InvokeObjectPostAlterHook(RelationRelationId,
19052 : RelationGetRelid(rel),
19053 : attnum);
19054 :
19055 : /*
19056 : * Apply the change to indexes as well (only for simple index columns,
19057 : * matching behavior of index.c ConstructTupleDescriptor()).
19058 : */
19059 44 : SetIndexStorageProperties(rel, attrel, attnum,
19060 : false, 0,
19061 : true, cmethod,
19062 : lockmode);
19063 :
19064 44 : heap_freetuple(tuple);
19065 :
19066 44 : table_close(attrel, RowExclusiveLock);
19067 :
19068 : /* make changes visible */
19069 44 : CommandCounterIncrement();
19070 :
19071 44 : ObjectAddressSubSet(address, RelationRelationId,
19072 : RelationGetRelid(rel), attnum);
19073 44 : return address;
19074 : }
19075 :
19076 :
19077 : /*
19078 : * Preparation phase for SET LOGGED/UNLOGGED
19079 : *
19080 : * This verifies that we're not trying to change a temp table. Also,
19081 : * existing foreign key constraints are checked to avoid ending up with
19082 : * permanent tables referencing unlogged tables.
19083 : */
19084 : static void
19085 67 : ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel, bool toLogged)
19086 : {
19087 : Relation pg_constraint;
19088 : HeapTuple tuple;
19089 : SysScanDesc scan;
19090 : ScanKeyData skey[1];
19091 :
19092 : /*
19093 : * Disallow changing status for a temp table. Also verify whether we can
19094 : * get away with doing nothing; in such cases we don't need to run the
19095 : * checks below, either.
19096 : */
19097 67 : switch (rel->rd_rel->relpersistence)
19098 : {
19099 0 : case RELPERSISTENCE_TEMP:
19100 0 : ereport(ERROR,
19101 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19102 : errmsg("cannot change logged status of table \"%s\" because it is temporary",
19103 : RelationGetRelationName(rel)),
19104 : errtable(rel)));
19105 : break;
19106 37 : case RELPERSISTENCE_PERMANENT:
19107 37 : if (toLogged)
19108 : /* nothing to do */
19109 8 : return;
19110 33 : break;
19111 30 : case RELPERSISTENCE_UNLOGGED:
19112 30 : if (!toLogged)
19113 : /* nothing to do */
19114 4 : return;
19115 26 : break;
19116 : }
19117 :
19118 : /*
19119 : * Check that the table is not part of any publication when changing to
19120 : * UNLOGGED, as UNLOGGED tables can't be published.
19121 : */
19122 92 : if (!toLogged &&
19123 33 : GetRelationIncludedPublications(RelationGetRelid(rel)) != NIL)
19124 0 : ereport(ERROR,
19125 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
19126 : errmsg("cannot change table \"%s\" to unlogged because it is part of a publication",
19127 : RelationGetRelationName(rel)),
19128 : errdetail("Unlogged relations cannot be replicated.")));
19129 :
19130 : /*
19131 : * Check existing foreign key constraints to preserve the invariant that
19132 : * permanent tables cannot reference unlogged ones. Self-referencing
19133 : * foreign keys can safely be ignored.
19134 : */
19135 59 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
19136 :
19137 : /*
19138 : * Scan conrelid if changing to permanent, else confrelid. This also
19139 : * determines whether a useful index exists.
19140 : */
19141 59 : ScanKeyInit(&skey[0],
19142 : toLogged ? Anum_pg_constraint_conrelid :
19143 : Anum_pg_constraint_confrelid,
19144 : BTEqualStrategyNumber, F_OIDEQ,
19145 : ObjectIdGetDatum(RelationGetRelid(rel)));
19146 59 : scan = systable_beginscan(pg_constraint,
19147 : toLogged ? ConstraintRelidTypidNameIndexId : InvalidOid,
19148 : true, NULL, 1, skey);
19149 :
19150 95 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
19151 : {
19152 44 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
19153 :
19154 44 : if (con->contype == CONSTRAINT_FOREIGN)
19155 : {
19156 : Oid foreignrelid;
19157 : Relation foreignrel;
19158 :
19159 : /* the opposite end of what we used as scankey */
19160 20 : foreignrelid = toLogged ? con->confrelid : con->conrelid;
19161 :
19162 : /* ignore if self-referencing */
19163 20 : if (RelationGetRelid(rel) == foreignrelid)
19164 8 : continue;
19165 :
19166 12 : foreignrel = relation_open(foreignrelid, AccessShareLock);
19167 :
19168 12 : if (toLogged)
19169 : {
19170 4 : if (!RelationIsPermanent(foreignrel))
19171 4 : ereport(ERROR,
19172 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19173 : errmsg("could not change table \"%s\" to logged because it references unlogged table \"%s\"",
19174 : RelationGetRelationName(rel),
19175 : RelationGetRelationName(foreignrel)),
19176 : errtableconstraint(rel, NameStr(con->conname))));
19177 : }
19178 : else
19179 : {
19180 8 : if (RelationIsPermanent(foreignrel))
19181 4 : ereport(ERROR,
19182 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19183 : errmsg("could not change table \"%s\" to unlogged because it references logged table \"%s\"",
19184 : RelationGetRelationName(rel),
19185 : RelationGetRelationName(foreignrel)),
19186 : errtableconstraint(rel, NameStr(con->conname))));
19187 : }
19188 :
19189 4 : relation_close(foreignrel, AccessShareLock);
19190 : }
19191 : }
19192 :
19193 51 : systable_endscan(scan);
19194 :
19195 51 : table_close(pg_constraint, AccessShareLock);
19196 :
19197 : /* force rewrite if necessary; see comment in ATRewriteTables */
19198 51 : tab->rewrite |= AT_REWRITE_ALTER_PERSISTENCE;
19199 51 : if (toLogged)
19200 22 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
19201 : else
19202 29 : tab->newrelpersistence = RELPERSISTENCE_UNLOGGED;
19203 51 : tab->chgPersistence = true;
19204 : }
19205 :
19206 : /*
19207 : * Execute ALTER TABLE SET SCHEMA
19208 : */
19209 : ObjectAddress
19210 88 : AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
19211 : {
19212 : Relation rel;
19213 : Oid relid;
19214 : Oid oldNspOid;
19215 : Oid nspOid;
19216 : RangeVar *newrv;
19217 : ObjectAddresses *objsMoved;
19218 : ObjectAddress myself;
19219 :
19220 88 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
19221 88 : stmt->missing_ok ? RVR_MISSING_OK : 0,
19222 : RangeVarCallbackForAlterRelation,
19223 : stmt);
19224 :
19225 83 : if (!OidIsValid(relid))
19226 : {
19227 12 : ereport(NOTICE,
19228 : (errmsg("relation \"%s\" does not exist, skipping",
19229 : stmt->relation->relname)));
19230 12 : return InvalidObjectAddress;
19231 : }
19232 :
19233 71 : rel = relation_open(relid, NoLock);
19234 :
19235 71 : oldNspOid = RelationGetNamespace(rel);
19236 :
19237 : /* If it's an owned sequence, disallow moving it by itself. */
19238 71 : if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
19239 : {
19240 : Oid tableId;
19241 : int32 colId;
19242 :
19243 6 : if (sequenceIsOwned(relid, DEPENDENCY_AUTO, &tableId, &colId) ||
19244 1 : sequenceIsOwned(relid, DEPENDENCY_INTERNAL, &tableId, &colId))
19245 4 : ereport(ERROR,
19246 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
19247 : errmsg("cannot move an owned sequence into another schema"),
19248 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
19249 : RelationGetRelationName(rel),
19250 : get_rel_name(tableId))));
19251 : }
19252 :
19253 : /* Get and lock schema OID and check its permissions. */
19254 67 : newrv = makeRangeVar(stmt->newschema, RelationGetRelationName(rel), -1);
19255 67 : nspOid = RangeVarGetAndCheckCreationNamespace(newrv, NoLock, NULL);
19256 :
19257 : /* common checks on switching namespaces */
19258 67 : CheckSetNamespace(oldNspOid, nspOid);
19259 :
19260 67 : objsMoved = new_object_addresses();
19261 67 : AlterTableNamespaceInternal(rel, oldNspOid, nspOid, objsMoved);
19262 63 : free_object_addresses(objsMoved);
19263 :
19264 63 : ObjectAddressSet(myself, RelationRelationId, relid);
19265 :
19266 63 : if (oldschema)
19267 63 : *oldschema = oldNspOid;
19268 :
19269 : /* close rel, but keep lock until commit */
19270 63 : relation_close(rel, NoLock);
19271 :
19272 63 : return myself;
19273 : }
19274 :
19275 : /*
19276 : * The guts of relocating a table or materialized view to another namespace:
19277 : * besides moving the relation itself, its dependent objects are relocated to
19278 : * the new schema.
19279 : */
19280 : void
19281 68 : AlterTableNamespaceInternal(Relation rel, Oid oldNspOid, Oid nspOid,
19282 : ObjectAddresses *objsMoved)
19283 : {
19284 : Relation classRel;
19285 :
19286 : Assert(objsMoved != NULL);
19287 :
19288 : /* OK, modify the pg_class row and pg_depend entry */
19289 68 : classRel = table_open(RelationRelationId, RowExclusiveLock);
19290 :
19291 68 : AlterRelationNamespaceInternal(classRel, RelationGetRelid(rel), oldNspOid,
19292 : nspOid, true, objsMoved);
19293 :
19294 : /* Fix the table's row type too, if it has one */
19295 64 : if (OidIsValid(rel->rd_rel->reltype))
19296 55 : AlterTypeNamespaceInternal(rel->rd_rel->reltype, nspOid,
19297 : false, /* isImplicitArray */
19298 : false, /* ignoreDependent */
19299 : false, /* errorOnTableType */
19300 : objsMoved);
19301 :
19302 : /* Fix other dependent stuff */
19303 64 : AlterIndexNamespaces(classRel, rel, oldNspOid, nspOid, objsMoved);
19304 64 : AlterSeqNamespaces(classRel, rel, oldNspOid, nspOid,
19305 : objsMoved, AccessExclusiveLock);
19306 64 : AlterConstraintNamespaces(RelationGetRelid(rel), oldNspOid, nspOid,
19307 : false, objsMoved);
19308 :
19309 64 : table_close(classRel, RowExclusiveLock);
19310 64 : }
19311 :
19312 : /*
19313 : * The guts of relocating a relation to another namespace: fix the pg_class
19314 : * entry, and the pg_depend entry if any. Caller must already have
19315 : * opened and write-locked pg_class.
19316 : */
19317 : void
19318 135 : AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
19319 : Oid oldNspOid, Oid newNspOid,
19320 : bool hasDependEntry,
19321 : ObjectAddresses *objsMoved)
19322 : {
19323 : HeapTuple classTup;
19324 : Form_pg_class classForm;
19325 : ObjectAddress thisobj;
19326 135 : bool already_done = false;
19327 :
19328 : /* no rel lock for relkind=c so use LOCKTAG_TUPLE */
19329 135 : classTup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(relOid));
19330 135 : if (!HeapTupleIsValid(classTup))
19331 0 : elog(ERROR, "cache lookup failed for relation %u", relOid);
19332 135 : classForm = (Form_pg_class) GETSTRUCT(classTup);
19333 :
19334 : Assert(classForm->relnamespace == oldNspOid);
19335 :
19336 135 : thisobj.classId = RelationRelationId;
19337 135 : thisobj.objectId = relOid;
19338 135 : thisobj.objectSubId = 0;
19339 :
19340 : /*
19341 : * If the object has already been moved, don't move it again. If it's
19342 : * already in the right place, don't move it, but still fire the object
19343 : * access hook.
19344 : */
19345 135 : already_done = object_address_present(&thisobj, objsMoved);
19346 135 : if (!already_done && oldNspOid != newNspOid)
19347 103 : {
19348 107 : ItemPointerData otid = classTup->t_self;
19349 :
19350 : /* check for duplicate name (more friendly than unique-index failure) */
19351 107 : if (get_relname_relid(NameStr(classForm->relname),
19352 : newNspOid) != InvalidOid)
19353 4 : ereport(ERROR,
19354 : (errcode(ERRCODE_DUPLICATE_TABLE),
19355 : errmsg("relation \"%s\" already exists in schema \"%s\"",
19356 : NameStr(classForm->relname),
19357 : get_namespace_name(newNspOid))));
19358 :
19359 : /* classTup is a copy, so OK to scribble on */
19360 103 : classForm->relnamespace = newNspOid;
19361 :
19362 103 : CatalogTupleUpdate(classRel, &otid, classTup);
19363 103 : UnlockTuple(classRel, &otid, InplaceUpdateTupleLock);
19364 :
19365 :
19366 : /* Update dependency on schema if caller said so */
19367 179 : if (hasDependEntry &&
19368 76 : changeDependencyFor(RelationRelationId,
19369 : relOid,
19370 : NamespaceRelationId,
19371 : oldNspOid,
19372 : newNspOid) != 1)
19373 0 : elog(ERROR, "could not change schema dependency for relation \"%s\"",
19374 : NameStr(classForm->relname));
19375 : }
19376 : else
19377 28 : UnlockTuple(classRel, &classTup->t_self, InplaceUpdateTupleLock);
19378 131 : if (!already_done)
19379 : {
19380 131 : add_exact_object_address(&thisobj, objsMoved);
19381 :
19382 131 : InvokeObjectPostAlterHook(RelationRelationId, relOid, 0);
19383 : }
19384 :
19385 131 : heap_freetuple(classTup);
19386 131 : }
19387 :
19388 : /*
19389 : * Move all indexes for the specified relation to another namespace.
19390 : *
19391 : * Note: we assume adequate permission checking was done by the caller,
19392 : * and that the caller has a suitable lock on the owning relation.
19393 : */
19394 : static void
19395 64 : AlterIndexNamespaces(Relation classRel, Relation rel,
19396 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved)
19397 : {
19398 : List *indexList;
19399 : ListCell *l;
19400 :
19401 64 : indexList = RelationGetIndexList(rel);
19402 :
19403 94 : foreach(l, indexList)
19404 : {
19405 30 : Oid indexOid = lfirst_oid(l);
19406 : ObjectAddress thisobj;
19407 :
19408 30 : thisobj.classId = RelationRelationId;
19409 30 : thisobj.objectId = indexOid;
19410 30 : thisobj.objectSubId = 0;
19411 :
19412 : /*
19413 : * Note: currently, the index will not have its own dependency on the
19414 : * namespace, so we don't need to do changeDependencyFor(). There's no
19415 : * row type in pg_type, either.
19416 : *
19417 : * XXX this objsMoved test may be pointless -- surely we have a single
19418 : * dependency link from a relation to each index?
19419 : */
19420 30 : if (!object_address_present(&thisobj, objsMoved))
19421 : {
19422 30 : AlterRelationNamespaceInternal(classRel, indexOid,
19423 : oldNspOid, newNspOid,
19424 : false, objsMoved);
19425 30 : add_exact_object_address(&thisobj, objsMoved);
19426 : }
19427 : }
19428 :
19429 64 : list_free(indexList);
19430 64 : }
19431 :
19432 : /*
19433 : * Move all identity and SERIAL-column sequences of the specified relation to another
19434 : * namespace.
19435 : *
19436 : * Note: we assume adequate permission checking was done by the caller,
19437 : * and that the caller has a suitable lock on the owning relation.
19438 : */
19439 : static void
19440 64 : AlterSeqNamespaces(Relation classRel, Relation rel,
19441 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
19442 : LOCKMODE lockmode)
19443 : {
19444 : Relation depRel;
19445 : SysScanDesc scan;
19446 : ScanKeyData key[2];
19447 : HeapTuple tup;
19448 :
19449 : /*
19450 : * SERIAL sequences are those having an auto dependency on one of the
19451 : * table's columns (we don't care *which* column, exactly).
19452 : */
19453 64 : depRel = table_open(DependRelationId, AccessShareLock);
19454 :
19455 64 : ScanKeyInit(&key[0],
19456 : Anum_pg_depend_refclassid,
19457 : BTEqualStrategyNumber, F_OIDEQ,
19458 : ObjectIdGetDatum(RelationRelationId));
19459 64 : ScanKeyInit(&key[1],
19460 : Anum_pg_depend_refobjid,
19461 : BTEqualStrategyNumber, F_OIDEQ,
19462 : ObjectIdGetDatum(RelationGetRelid(rel)));
19463 : /* we leave refobjsubid unspecified */
19464 :
19465 64 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
19466 : NULL, 2, key);
19467 :
19468 417 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
19469 : {
19470 353 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
19471 : Relation seqRel;
19472 :
19473 : /* skip dependencies other than auto dependencies on columns */
19474 353 : if (depForm->refobjsubid == 0 ||
19475 252 : depForm->classid != RelationRelationId ||
19476 28 : depForm->objsubid != 0 ||
19477 28 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
19478 325 : continue;
19479 :
19480 : /* Use relation_open just in case it's an index */
19481 28 : seqRel = relation_open(depForm->objid, lockmode);
19482 :
19483 : /* skip non-sequence relations */
19484 28 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
19485 : {
19486 : /* No need to keep the lock */
19487 0 : relation_close(seqRel, lockmode);
19488 0 : continue;
19489 : }
19490 :
19491 : /* Fix the pg_class and pg_depend entries */
19492 28 : AlterRelationNamespaceInternal(classRel, depForm->objid,
19493 : oldNspOid, newNspOid,
19494 : true, objsMoved);
19495 :
19496 : /*
19497 : * Sequences used to have entries in pg_type, but no longer do. If we
19498 : * ever re-instate that, we'll need to move the pg_type entry to the
19499 : * new namespace, too (using AlterTypeNamespaceInternal).
19500 : */
19501 : Assert(RelationGetForm(seqRel)->reltype == InvalidOid);
19502 :
19503 : /* Now we can close it. Keep the lock till end of transaction. */
19504 28 : relation_close(seqRel, NoLock);
19505 : }
19506 :
19507 64 : systable_endscan(scan);
19508 :
19509 64 : relation_close(depRel, AccessShareLock);
19510 64 : }
19511 :
19512 :
19513 : /*
19514 : * This code supports
19515 : * CREATE TEMP TABLE ... ON COMMIT { DROP | PRESERVE ROWS | DELETE ROWS }
19516 : *
19517 : * Because we only support this for TEMP tables, it's sufficient to remember
19518 : * the state in a backend-local data structure.
19519 : */
19520 :
19521 : /*
19522 : * Register a newly-created relation's ON COMMIT action.
19523 : */
19524 : void
19525 120 : register_on_commit_action(Oid relid, OnCommitAction action)
19526 : {
19527 : OnCommitItem *oc;
19528 : MemoryContext oldcxt;
19529 :
19530 : /*
19531 : * We needn't bother registering the relation unless there is an ON COMMIT
19532 : * action we need to take.
19533 : */
19534 120 : if (action == ONCOMMIT_NOOP || action == ONCOMMIT_PRESERVE_ROWS)
19535 16 : return;
19536 :
19537 104 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
19538 :
19539 104 : oc = palloc_object(OnCommitItem);
19540 104 : oc->relid = relid;
19541 104 : oc->oncommit = action;
19542 104 : oc->creating_subid = GetCurrentSubTransactionId();
19543 104 : oc->deleting_subid = InvalidSubTransactionId;
19544 :
19545 : /*
19546 : * We use lcons() here so that ON COMMIT actions are processed in reverse
19547 : * order of registration. That might not be essential but it seems
19548 : * reasonable.
19549 : */
19550 104 : on_commits = lcons(oc, on_commits);
19551 :
19552 104 : MemoryContextSwitchTo(oldcxt);
19553 : }
19554 :
19555 : /*
19556 : * Unregister any ON COMMIT action when a relation is deleted.
19557 : *
19558 : * Actually, we only mark the OnCommitItem entry as to be deleted after commit.
19559 : */
19560 : void
19561 33432 : remove_on_commit_action(Oid relid)
19562 : {
19563 : ListCell *l;
19564 :
19565 33545 : foreach(l, on_commits)
19566 : {
19567 205 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19568 :
19569 205 : if (oc->relid == relid)
19570 : {
19571 92 : oc->deleting_subid = GetCurrentSubTransactionId();
19572 92 : break;
19573 : }
19574 : }
19575 33432 : }
19576 :
19577 : /*
19578 : * Perform ON COMMIT actions.
19579 : *
19580 : * This is invoked just before actually committing, since it's possible
19581 : * to encounter errors.
19582 : */
19583 : void
19584 617468 : PreCommit_on_commit_actions(void)
19585 : {
19586 : ListCell *l;
19587 617468 : List *oids_to_truncate = NIL;
19588 617468 : List *oids_to_drop = NIL;
19589 :
19590 618014 : foreach(l, on_commits)
19591 : {
19592 546 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19593 :
19594 : /* Ignore entry if already dropped in this xact */
19595 546 : if (oc->deleting_subid != InvalidSubTransactionId)
19596 49 : continue;
19597 :
19598 497 : switch (oc->oncommit)
19599 : {
19600 0 : case ONCOMMIT_NOOP:
19601 : case ONCOMMIT_PRESERVE_ROWS:
19602 : /* Do nothing (there shouldn't be such entries, actually) */
19603 0 : break;
19604 462 : case ONCOMMIT_DELETE_ROWS:
19605 :
19606 : /*
19607 : * If this transaction hasn't accessed any temporary
19608 : * relations, we can skip truncating ON COMMIT DELETE ROWS
19609 : * tables, as they must still be empty.
19610 : */
19611 462 : if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
19612 298 : oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
19613 462 : break;
19614 35 : case ONCOMMIT_DROP:
19615 35 : oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
19616 35 : break;
19617 : }
19618 : }
19619 :
19620 : /*
19621 : * Truncate relations before dropping so that all dependencies between
19622 : * relations are removed after they are worked on. Doing it like this
19623 : * might be a waste as it is possible that a relation being truncated will
19624 : * be dropped anyway due to its parent being dropped, but this makes the
19625 : * code more robust because of not having to re-check that the relation
19626 : * exists at truncation time.
19627 : */
19628 617468 : if (oids_to_truncate != NIL)
19629 254 : heap_truncate(oids_to_truncate);
19630 :
19631 617464 : if (oids_to_drop != NIL)
19632 : {
19633 31 : ObjectAddresses *targetObjects = new_object_addresses();
19634 :
19635 66 : foreach(l, oids_to_drop)
19636 : {
19637 : ObjectAddress object;
19638 :
19639 35 : object.classId = RelationRelationId;
19640 35 : object.objectId = lfirst_oid(l);
19641 35 : object.objectSubId = 0;
19642 :
19643 : Assert(!object_address_present(&object, targetObjects));
19644 :
19645 35 : add_exact_object_address(&object, targetObjects);
19646 : }
19647 :
19648 : /*
19649 : * Object deletion might involve toast table access (to clean up
19650 : * toasted catalog entries), so ensure we have a valid snapshot.
19651 : */
19652 31 : PushActiveSnapshot(GetTransactionSnapshot());
19653 :
19654 : /*
19655 : * Since this is an automatic drop, rather than one directly initiated
19656 : * by the user, we pass the PERFORM_DELETION_INTERNAL flag.
19657 : */
19658 31 : performMultipleDeletions(targetObjects, DROP_CASCADE,
19659 : PERFORM_DELETION_INTERNAL | PERFORM_DELETION_QUIETLY);
19660 :
19661 31 : PopActiveSnapshot();
19662 :
19663 : #ifdef USE_ASSERT_CHECKING
19664 :
19665 : /*
19666 : * Note that table deletion will call remove_on_commit_action, so the
19667 : * entry should get marked as deleted.
19668 : */
19669 : foreach(l, on_commits)
19670 : {
19671 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19672 :
19673 : if (oc->oncommit != ONCOMMIT_DROP)
19674 : continue;
19675 :
19676 : Assert(oc->deleting_subid != InvalidSubTransactionId);
19677 : }
19678 : #endif
19679 : }
19680 617464 : }
19681 :
19682 : /*
19683 : * Post-commit or post-abort cleanup for ON COMMIT management.
19684 : *
19685 : * All we do here is remove no-longer-needed OnCommitItem entries.
19686 : *
19687 : * During commit, remove entries that were deleted during this transaction;
19688 : * during abort, remove those created during this transaction.
19689 : */
19690 : void
19691 652632 : AtEOXact_on_commit_actions(bool isCommit)
19692 : {
19693 : ListCell *cur_item;
19694 :
19695 653202 : foreach(cur_item, on_commits)
19696 : {
19697 570 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19698 :
19699 642 : if (isCommit ? oc->deleting_subid != InvalidSubTransactionId :
19700 72 : oc->creating_subid != InvalidSubTransactionId)
19701 : {
19702 : /* cur_item must be removed */
19703 104 : on_commits = foreach_delete_current(on_commits, cur_item);
19704 104 : pfree(oc);
19705 : }
19706 : else
19707 : {
19708 : /* cur_item must be preserved */
19709 466 : oc->creating_subid = InvalidSubTransactionId;
19710 466 : oc->deleting_subid = InvalidSubTransactionId;
19711 : }
19712 : }
19713 652632 : }
19714 :
19715 : /*
19716 : * Post-subcommit or post-subabort cleanup for ON COMMIT management.
19717 : *
19718 : * During subabort, we can immediately remove entries created during this
19719 : * subtransaction. During subcommit, just relabel entries marked during
19720 : * this subtransaction as being the parent's responsibility.
19721 : */
19722 : void
19723 11031 : AtEOSubXact_on_commit_actions(bool isCommit, SubTransactionId mySubid,
19724 : SubTransactionId parentSubid)
19725 : {
19726 : ListCell *cur_item;
19727 :
19728 11031 : foreach(cur_item, on_commits)
19729 : {
19730 0 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19731 :
19732 0 : if (!isCommit && oc->creating_subid == mySubid)
19733 : {
19734 : /* cur_item must be removed */
19735 0 : on_commits = foreach_delete_current(on_commits, cur_item);
19736 0 : pfree(oc);
19737 : }
19738 : else
19739 : {
19740 : /* cur_item must be preserved */
19741 0 : if (oc->creating_subid == mySubid)
19742 0 : oc->creating_subid = parentSubid;
19743 0 : if (oc->deleting_subid == mySubid)
19744 0 : oc->deleting_subid = isCommit ? parentSubid : InvalidSubTransactionId;
19745 : }
19746 : }
19747 11031 : }
19748 :
19749 : /*
19750 : * This is intended as a callback for RangeVarGetRelidExtended(). It allows
19751 : * the relation to be locked only if (1) it's a plain or partitioned table,
19752 : * materialized view, or TOAST table and (2) the current user is the owner (or
19753 : * the superuser) or has been granted MAINTAIN. This meets the
19754 : * permission-checking needs of CLUSTER, REINDEX TABLE, and REFRESH
19755 : * MATERIALIZED VIEW; we expose it here so that it can be used by all.
19756 : */
19757 : void
19758 720 : RangeVarCallbackMaintainsTable(const RangeVar *relation,
19759 : Oid relId, Oid oldRelId, void *arg)
19760 : {
19761 : char relkind;
19762 : AclResult aclresult;
19763 :
19764 : /* Nothing to do if the relation was not found. */
19765 720 : if (!OidIsValid(relId))
19766 4 : return;
19767 :
19768 : /*
19769 : * If the relation does exist, check whether it's an index. But note that
19770 : * the relation might have been dropped between the time we did the name
19771 : * lookup and now. In that case, there's nothing to do.
19772 : */
19773 716 : relkind = get_rel_relkind(relId);
19774 716 : if (!relkind)
19775 0 : return;
19776 716 : if (relkind != RELKIND_RELATION && relkind != RELKIND_TOASTVALUE &&
19777 105 : relkind != RELKIND_MATVIEW && relkind != RELKIND_PARTITIONED_TABLE)
19778 18 : ereport(ERROR,
19779 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19780 : errmsg("\"%s\" is not a table or materialized view", relation->relname)));
19781 :
19782 : /* Check permissions */
19783 698 : aclresult = pg_class_aclcheck(relId, GetUserId(), ACL_MAINTAIN);
19784 698 : if (aclresult != ACLCHECK_OK)
19785 20 : aclcheck_error(aclresult,
19786 20 : get_relkind_objtype(get_rel_relkind(relId)),
19787 20 : relation->relname);
19788 : }
19789 :
19790 : /*
19791 : * Callback to RangeVarGetRelidExtended() for TRUNCATE processing.
19792 : */
19793 : static void
19794 1412 : RangeVarCallbackForTruncate(const RangeVar *relation,
19795 : Oid relId, Oid oldRelId, void *arg)
19796 : {
19797 : HeapTuple tuple;
19798 :
19799 : /* Nothing to do if the relation was not found. */
19800 1412 : if (!OidIsValid(relId))
19801 0 : return;
19802 :
19803 1412 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19804 1412 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19805 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19806 :
19807 1412 : truncate_check_rel(relId, (Form_pg_class) GETSTRUCT(tuple));
19808 1409 : truncate_check_perms(relId, (Form_pg_class) GETSTRUCT(tuple));
19809 :
19810 1389 : ReleaseSysCache(tuple);
19811 : }
19812 :
19813 : /*
19814 : * Callback for RangeVarGetRelidExtended(). Checks that the current user is
19815 : * the owner of the relation, or superuser.
19816 : */
19817 : void
19818 11911 : RangeVarCallbackOwnsRelation(const RangeVar *relation,
19819 : Oid relId, Oid oldRelId, void *arg)
19820 : {
19821 : HeapTuple tuple;
19822 :
19823 : /* Nothing to do if the relation was not found. */
19824 11911 : if (!OidIsValid(relId))
19825 18 : return;
19826 :
19827 11893 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19828 11893 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19829 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19830 :
19831 11893 : if (!object_ownercheck(RelationRelationId, relId, GetUserId()))
19832 16 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relId)),
19833 16 : relation->relname);
19834 :
19835 23694 : if (!allowSystemTableMods &&
19836 11817 : IsSystemClass(relId, (Form_pg_class) GETSTRUCT(tuple)))
19837 1 : ereport(ERROR,
19838 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19839 : errmsg("permission denied: \"%s\" is a system catalog",
19840 : relation->relname)));
19841 :
19842 11876 : ReleaseSysCache(tuple);
19843 : }
19844 :
19845 : /*
19846 : * Common RangeVarGetRelid callback for rename, set schema, and alter table
19847 : * processing.
19848 : */
19849 : static void
19850 22832 : RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid, Oid oldrelid,
19851 : void *arg)
19852 : {
19853 22832 : Node *stmt = (Node *) arg;
19854 : ObjectType reltype;
19855 : HeapTuple tuple;
19856 : Form_pg_class classform;
19857 : AclResult aclresult;
19858 : char relkind;
19859 :
19860 22832 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
19861 22832 : if (!HeapTupleIsValid(tuple))
19862 168 : return; /* concurrently dropped */
19863 22664 : classform = (Form_pg_class) GETSTRUCT(tuple);
19864 22664 : relkind = classform->relkind;
19865 :
19866 : /* Must own relation. */
19867 22664 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
19868 56 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
19869 :
19870 : /* No system table modifications unless explicitly allowed. */
19871 22608 : if (!allowSystemTableMods && IsSystemClass(relid, classform))
19872 18 : ereport(ERROR,
19873 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19874 : errmsg("permission denied: \"%s\" is a system catalog",
19875 : rv->relname)));
19876 :
19877 : /*
19878 : * Extract the specified relation type from the statement parse tree.
19879 : *
19880 : * Also, for ALTER .. RENAME, check permissions: the user must (still)
19881 : * have CREATE rights on the containing namespace.
19882 : */
19883 22590 : if (IsA(stmt, RenameStmt))
19884 : {
19885 314 : aclresult = object_aclcheck(NamespaceRelationId, classform->relnamespace,
19886 : GetUserId(), ACL_CREATE);
19887 314 : if (aclresult != ACLCHECK_OK)
19888 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
19889 0 : get_namespace_name(classform->relnamespace));
19890 314 : reltype = ((RenameStmt *) stmt)->renameType;
19891 : }
19892 22276 : else if (IsA(stmt, AlterObjectSchemaStmt))
19893 76 : reltype = ((AlterObjectSchemaStmt *) stmt)->objectType;
19894 :
19895 22200 : else if (IsA(stmt, AlterTableStmt))
19896 22200 : reltype = ((AlterTableStmt *) stmt)->objtype;
19897 : else
19898 : {
19899 0 : elog(ERROR, "unrecognized node type: %d", (int) nodeTag(stmt));
19900 : reltype = OBJECT_TABLE; /* placate compiler */
19901 : }
19902 :
19903 : /*
19904 : * For compatibility with prior releases, we allow ALTER TABLE to be used
19905 : * with most other types of relations (but not composite types). We allow
19906 : * similar flexibility for ALTER INDEX in the case of RENAME, but not
19907 : * otherwise. Otherwise, the user must select the correct form of the
19908 : * command for the relation at issue.
19909 : */
19910 22590 : if (reltype == OBJECT_SEQUENCE && relkind != RELKIND_SEQUENCE)
19911 0 : ereport(ERROR,
19912 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19913 : errmsg("\"%s\" is not a sequence", rv->relname)));
19914 :
19915 22590 : if (reltype == OBJECT_VIEW && relkind != RELKIND_VIEW)
19916 0 : ereport(ERROR,
19917 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19918 : errmsg("\"%s\" is not a view", rv->relname)));
19919 :
19920 22590 : if (reltype == OBJECT_MATVIEW && relkind != RELKIND_MATVIEW)
19921 0 : ereport(ERROR,
19922 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19923 : errmsg("\"%s\" is not a materialized view", rv->relname)));
19924 :
19925 22590 : if (reltype == OBJECT_FOREIGN_TABLE && relkind != RELKIND_FOREIGN_TABLE)
19926 0 : ereport(ERROR,
19927 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19928 : errmsg("\"%s\" is not a foreign table", rv->relname)));
19929 :
19930 22590 : if (reltype == OBJECT_TYPE && relkind != RELKIND_COMPOSITE_TYPE)
19931 0 : ereport(ERROR,
19932 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19933 : errmsg("\"%s\" is not a composite type", rv->relname)));
19934 :
19935 22590 : if (reltype == OBJECT_PROPGRAPH && relkind != RELKIND_PROPGRAPH)
19936 0 : ereport(ERROR,
19937 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19938 : errmsg("\"%s\" is not a property graph", rv->relname)));
19939 :
19940 22590 : if (reltype == OBJECT_INDEX && relkind != RELKIND_INDEX &&
19941 : relkind != RELKIND_PARTITIONED_INDEX
19942 26 : && !IsA(stmt, RenameStmt))
19943 4 : ereport(ERROR,
19944 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19945 : errmsg("\"%s\" is not an index", rv->relname)));
19946 :
19947 : /*
19948 : * Don't allow ALTER TABLE on composite types. We want people to use ALTER
19949 : * TYPE for that.
19950 : */
19951 22586 : if (reltype != OBJECT_TYPE && relkind == RELKIND_COMPOSITE_TYPE)
19952 0 : ereport(ERROR,
19953 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19954 : errmsg("\"%s\" is a composite type", rv->relname),
19955 : /* translator: %s is an SQL ALTER command */
19956 : errhint("Use %s instead.",
19957 : "ALTER TYPE")));
19958 :
19959 : /*
19960 : * Don't allow ALTER TABLE .. SET SCHEMA on relations that can't be moved
19961 : * to a different schema, such as indexes and TOAST tables.
19962 : */
19963 22586 : if (IsA(stmt, AlterObjectSchemaStmt))
19964 : {
19965 76 : if (relkind == RELKIND_INDEX || relkind == RELKIND_PARTITIONED_INDEX)
19966 0 : ereport(ERROR,
19967 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19968 : errmsg("cannot change schema of index \"%s\"",
19969 : rv->relname),
19970 : errhint("Change the schema of the table instead.")));
19971 76 : else if (relkind == RELKIND_COMPOSITE_TYPE)
19972 0 : ereport(ERROR,
19973 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19974 : errmsg("cannot change schema of composite type \"%s\"",
19975 : rv->relname),
19976 : /* translator: %s is an SQL ALTER command */
19977 : errhint("Use %s instead.",
19978 : "ALTER TYPE")));
19979 76 : else if (relkind == RELKIND_TOASTVALUE)
19980 0 : ereport(ERROR,
19981 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19982 : errmsg("cannot change schema of TOAST table \"%s\"",
19983 : rv->relname),
19984 : errhint("Change the schema of the table instead.")));
19985 : }
19986 :
19987 22586 : ReleaseSysCache(tuple);
19988 : }
19989 :
19990 : /*
19991 : * Transform any expressions present in the partition key
19992 : *
19993 : * Returns a transformed PartitionSpec.
19994 : */
19995 : static PartitionSpec *
19996 3581 : transformPartitionSpec(Relation rel, PartitionSpec *partspec)
19997 : {
19998 : PartitionSpec *newspec;
19999 : ParseState *pstate;
20000 : ParseNamespaceItem *nsitem;
20001 : ListCell *l;
20002 :
20003 3581 : newspec = makeNode(PartitionSpec);
20004 :
20005 3581 : newspec->strategy = partspec->strategy;
20006 3581 : newspec->partParams = NIL;
20007 3581 : newspec->location = partspec->location;
20008 :
20009 : /* Check valid number of columns for strategy */
20010 5192 : if (partspec->strategy == PARTITION_STRATEGY_LIST &&
20011 1611 : list_length(partspec->partParams) != 1)
20012 4 : ereport(ERROR,
20013 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20014 : errmsg("cannot use \"list\" partition strategy with more than one column")));
20015 :
20016 : /*
20017 : * Create a dummy ParseState and insert the target relation as its sole
20018 : * rangetable entry. We need a ParseState for transformExpr.
20019 : */
20020 3577 : pstate = make_parsestate(NULL);
20021 3577 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
20022 : NULL, false, true);
20023 3577 : addNSItemToQuery(pstate, nsitem, true, true, true);
20024 :
20025 : /* take care of any partition expressions */
20026 7456 : foreach(l, partspec->partParams)
20027 : {
20028 3895 : PartitionElem *pelem = lfirst_node(PartitionElem, l);
20029 :
20030 3895 : if (pelem->expr)
20031 : {
20032 : /* Copy, to avoid scribbling on the input */
20033 232 : pelem = copyObject(pelem);
20034 :
20035 : /* Now do parse transformation of the expression */
20036 232 : pelem->expr = transformExpr(pstate, pelem->expr,
20037 : EXPR_KIND_PARTITION_EXPRESSION);
20038 :
20039 : /* we have to fix its collations too */
20040 216 : assign_expr_collations(pstate, pelem->expr);
20041 : }
20042 :
20043 3879 : newspec->partParams = lappend(newspec->partParams, pelem);
20044 : }
20045 :
20046 3561 : return newspec;
20047 : }
20048 :
20049 : /*
20050 : * Compute per-partition-column information from a list of PartitionElems.
20051 : * Expressions in the PartitionElems must be parse-analyzed already.
20052 : */
20053 : static void
20054 3561 : ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
20055 : List **partexprs, Oid *partopclass, Oid *partcollation,
20056 : PartitionStrategy strategy)
20057 : {
20058 : int attn;
20059 : ListCell *lc;
20060 : Oid am_oid;
20061 :
20062 3561 : attn = 0;
20063 7352 : foreach(lc, partParams)
20064 : {
20065 3879 : PartitionElem *pelem = lfirst_node(PartitionElem, lc);
20066 : Oid atttype;
20067 : Oid attcollation;
20068 :
20069 3879 : if (pelem->name != NULL)
20070 : {
20071 : /* Simple attribute reference */
20072 : HeapTuple atttuple;
20073 : Form_pg_attribute attform;
20074 :
20075 3663 : atttuple = SearchSysCacheAttName(RelationGetRelid(rel),
20076 3663 : pelem->name);
20077 3663 : if (!HeapTupleIsValid(atttuple))
20078 8 : ereport(ERROR,
20079 : (errcode(ERRCODE_UNDEFINED_COLUMN),
20080 : errmsg("column \"%s\" named in partition key does not exist",
20081 : pelem->name),
20082 : parser_errposition(pstate, pelem->location)));
20083 3655 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
20084 :
20085 3655 : if (attform->attnum <= 0)
20086 4 : ereport(ERROR,
20087 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20088 : errmsg("cannot use system column \"%s\" in partition key",
20089 : pelem->name),
20090 : parser_errposition(pstate, pelem->location)));
20091 :
20092 : /*
20093 : * Stored generated columns cannot work: They are computed after
20094 : * BEFORE triggers, but partition routing is done before all
20095 : * triggers. Maybe virtual generated columns could be made to
20096 : * work, but then they would need to be handled as an expression
20097 : * below.
20098 : */
20099 3651 : if (attform->attgenerated)
20100 8 : ereport(ERROR,
20101 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20102 : errmsg("cannot use generated column in partition key"),
20103 : errdetail("Column \"%s\" is a generated column.",
20104 : pelem->name),
20105 : parser_errposition(pstate, pelem->location)));
20106 :
20107 3643 : partattrs[attn] = attform->attnum;
20108 3643 : atttype = attform->atttypid;
20109 3643 : attcollation = attform->attcollation;
20110 3643 : ReleaseSysCache(atttuple);
20111 : }
20112 : else
20113 : {
20114 : /* Expression */
20115 216 : Node *expr = pelem->expr;
20116 : char partattname[16];
20117 216 : Bitmapset *expr_attrs = NULL;
20118 : int i;
20119 :
20120 : Assert(expr != NULL);
20121 216 : atttype = exprType(expr);
20122 216 : attcollation = exprCollation(expr);
20123 :
20124 : /*
20125 : * The expression must be of a storable type (e.g., not RECORD).
20126 : * The test is the same as for whether a table column is of a safe
20127 : * type (which is why we needn't check for the non-expression
20128 : * case).
20129 : */
20130 216 : snprintf(partattname, sizeof(partattname), "%d", attn + 1);
20131 216 : CheckAttributeType(partattname,
20132 : atttype, attcollation,
20133 : NIL, CHKATYPE_IS_PARTKEY);
20134 :
20135 : /*
20136 : * Strip any top-level COLLATE clause. This ensures that we treat
20137 : * "x COLLATE y" and "(x COLLATE y)" alike.
20138 : */
20139 208 : while (IsA(expr, CollateExpr))
20140 0 : expr = (Node *) ((CollateExpr *) expr)->arg;
20141 :
20142 : /*
20143 : * Examine all the columns in the partition key expression. When
20144 : * the whole-row reference is present, examine all the columns of
20145 : * the partitioned table.
20146 : */
20147 208 : pull_varattnos(expr, 1, &expr_attrs);
20148 208 : if (bms_is_member(0 - FirstLowInvalidHeapAttributeNumber, expr_attrs))
20149 : {
20150 40 : expr_attrs = bms_add_range(expr_attrs,
20151 : 1 - FirstLowInvalidHeapAttributeNumber,
20152 20 : RelationGetNumberOfAttributes(rel) - FirstLowInvalidHeapAttributeNumber);
20153 20 : expr_attrs = bms_del_member(expr_attrs, 0 - FirstLowInvalidHeapAttributeNumber);
20154 : }
20155 :
20156 208 : i = -1;
20157 457 : while ((i = bms_next_member(expr_attrs, i)) >= 0)
20158 : {
20159 281 : AttrNumber attno = i + FirstLowInvalidHeapAttributeNumber;
20160 :
20161 : Assert(attno != 0);
20162 :
20163 : /*
20164 : * Cannot allow system column references, since that would
20165 : * make partition routing impossible: their values won't be
20166 : * known yet when we need to do that.
20167 : */
20168 281 : if (attno < 0)
20169 0 : ereport(ERROR,
20170 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20171 : errmsg("partition key expressions cannot contain system column references")));
20172 :
20173 : /*
20174 : * Stored generated columns cannot work: They are computed
20175 : * after BEFORE triggers, but partition routing is done before
20176 : * all triggers. Virtual generated columns could probably
20177 : * work, but it would require more work elsewhere (for example
20178 : * SET EXPRESSION would need to check whether the column is
20179 : * used in partition keys). Seems safer to prohibit for now.
20180 : */
20181 281 : if (TupleDescAttr(RelationGetDescr(rel), attno - 1)->attgenerated)
20182 32 : ereport(ERROR,
20183 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20184 : errmsg("cannot use generated column in partition key"),
20185 : errdetail("Column \"%s\" is a generated column.",
20186 : get_attname(RelationGetRelid(rel), attno, false)),
20187 : parser_errposition(pstate, pelem->location)));
20188 : }
20189 :
20190 176 : if (IsA(expr, Var) &&
20191 8 : ((Var *) expr)->varattno > 0)
20192 : {
20193 :
20194 : /*
20195 : * User wrote "(column)" or "(column COLLATE something)".
20196 : * Treat it like simple attribute anyway.
20197 : */
20198 4 : partattrs[attn] = ((Var *) expr)->varattno;
20199 : }
20200 : else
20201 : {
20202 172 : partattrs[attn] = 0; /* marks the column as expression */
20203 172 : *partexprs = lappend(*partexprs, expr);
20204 :
20205 : /*
20206 : * transformPartitionSpec() should have already rejected
20207 : * subqueries, aggregates, window functions, and SRFs, based
20208 : * on the EXPR_KIND_ for partition expressions.
20209 : */
20210 :
20211 : /*
20212 : * Preprocess the expression before checking for mutability.
20213 : * This is essential for the reasons described in
20214 : * contain_mutable_functions_after_planning. However, we call
20215 : * expression_planner for ourselves rather than using that
20216 : * function, because if constant-folding reduces the
20217 : * expression to a constant, we'd like to know that so we can
20218 : * complain below.
20219 : *
20220 : * Like contain_mutable_functions_after_planning, assume that
20221 : * expression_planner won't scribble on its input, so this
20222 : * won't affect the partexprs entry we saved above.
20223 : */
20224 172 : expr = (Node *) expression_planner((Expr *) expr);
20225 :
20226 : /*
20227 : * Partition expressions cannot contain mutable functions,
20228 : * because a given row must always map to the same partition
20229 : * as long as there is no change in the partition boundary
20230 : * structure.
20231 : */
20232 172 : if (contain_mutable_functions(expr))
20233 4 : ereport(ERROR,
20234 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20235 : errmsg("functions in partition key expression must be marked IMMUTABLE")));
20236 :
20237 : /*
20238 : * While it is not exactly *wrong* for a partition expression
20239 : * to be a constant, it seems better to reject such keys.
20240 : */
20241 168 : if (IsA(expr, Const))
20242 8 : ereport(ERROR,
20243 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20244 : errmsg("cannot use constant expression as partition key")));
20245 : }
20246 : }
20247 :
20248 : /*
20249 : * Apply collation override if any
20250 : */
20251 3807 : if (pelem->collation)
20252 36 : attcollation = get_collation_oid(pelem->collation, false);
20253 :
20254 : /*
20255 : * Check we have a collation iff it's a collatable type. The only
20256 : * expected failures here are (1) COLLATE applied to a noncollatable
20257 : * type, or (2) partition expression had an unresolved collation. But
20258 : * we might as well code this to be a complete consistency check.
20259 : */
20260 3807 : if (type_is_collatable(atttype))
20261 : {
20262 436 : if (!OidIsValid(attcollation))
20263 0 : ereport(ERROR,
20264 : (errcode(ERRCODE_INDETERMINATE_COLLATION),
20265 : errmsg("could not determine which collation to use for partition expression"),
20266 : errhint("Use the COLLATE clause to set the collation explicitly.")));
20267 : }
20268 : else
20269 : {
20270 3371 : if (OidIsValid(attcollation))
20271 0 : ereport(ERROR,
20272 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20273 : errmsg("collations are not supported by type %s",
20274 : format_type_be(atttype))));
20275 : }
20276 :
20277 3807 : partcollation[attn] = attcollation;
20278 :
20279 : /*
20280 : * Identify the appropriate operator class. For list and range
20281 : * partitioning, we use a btree operator class; hash partitioning uses
20282 : * a hash operator class.
20283 : */
20284 3807 : if (strategy == PARTITION_STRATEGY_HASH)
20285 215 : am_oid = HASH_AM_OID;
20286 : else
20287 3592 : am_oid = BTREE_AM_OID;
20288 :
20289 3807 : if (!pelem->opclass)
20290 : {
20291 3715 : partopclass[attn] = GetDefaultOpClass(atttype, am_oid);
20292 :
20293 3715 : if (!OidIsValid(partopclass[attn]))
20294 : {
20295 8 : if (strategy == PARTITION_STRATEGY_HASH)
20296 0 : ereport(ERROR,
20297 : (errcode(ERRCODE_UNDEFINED_OBJECT),
20298 : errmsg("data type %s has no default operator class for access method \"%s\"",
20299 : format_type_be(atttype), "hash"),
20300 : errhint("You must specify a hash operator class or define a default hash operator class for the data type.")));
20301 : else
20302 8 : ereport(ERROR,
20303 : (errcode(ERRCODE_UNDEFINED_OBJECT),
20304 : errmsg("data type %s has no default operator class for access method \"%s\"",
20305 : format_type_be(atttype), "btree"),
20306 : errhint("You must specify a btree operator class or define a default btree operator class for the data type.")));
20307 : }
20308 : }
20309 : else
20310 92 : partopclass[attn] = ResolveOpClass(pelem->opclass,
20311 : atttype,
20312 : am_oid == HASH_AM_OID ? "hash" : "btree",
20313 : am_oid);
20314 :
20315 3791 : attn++;
20316 : }
20317 3473 : }
20318 :
20319 : /*
20320 : * PartConstraintImpliedByRelConstraint
20321 : * Do scanrel's existing constraints imply the partition constraint?
20322 : *
20323 : * "Existing constraints" include its check constraints and column-level
20324 : * not-null constraints. partConstraint describes the partition constraint,
20325 : * in implicit-AND form.
20326 : */
20327 : bool
20328 2058 : PartConstraintImpliedByRelConstraint(Relation scanrel,
20329 : List *partConstraint)
20330 : {
20331 2058 : List *existConstraint = NIL;
20332 2058 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20333 : int i;
20334 :
20335 2058 : if (constr && constr->has_not_null)
20336 : {
20337 544 : int natts = scanrel->rd_att->natts;
20338 :
20339 1870 : for (i = 1; i <= natts; i++)
20340 : {
20341 1326 : CompactAttribute *att = TupleDescCompactAttr(scanrel->rd_att, i - 1);
20342 :
20343 : /* invalid not-null constraint must be ignored here */
20344 1326 : if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
20345 : {
20346 747 : Form_pg_attribute wholeatt = TupleDescAttr(scanrel->rd_att, i - 1);
20347 747 : NullTest *ntest = makeNode(NullTest);
20348 :
20349 747 : ntest->arg = (Expr *) makeVar(1,
20350 : i,
20351 : wholeatt->atttypid,
20352 : wholeatt->atttypmod,
20353 : wholeatt->attcollation,
20354 : 0);
20355 747 : ntest->nulltesttype = IS_NOT_NULL;
20356 :
20357 : /*
20358 : * argisrow=false is correct even for a composite column,
20359 : * because attnotnull does not represent a SQL-spec IS NOT
20360 : * NULL test in such a case, just IS DISTINCT FROM NULL.
20361 : */
20362 747 : ntest->argisrow = false;
20363 747 : ntest->location = -1;
20364 747 : existConstraint = lappend(existConstraint, ntest);
20365 : }
20366 : }
20367 : }
20368 :
20369 2058 : return ConstraintImpliedByRelConstraint(scanrel, partConstraint, existConstraint);
20370 : }
20371 :
20372 : /*
20373 : * ConstraintImpliedByRelConstraint
20374 : * Do scanrel's existing constraints imply the given constraint?
20375 : *
20376 : * testConstraint is the constraint to validate. provenConstraint is a
20377 : * caller-provided list of conditions which this function may assume
20378 : * to be true. Both provenConstraint and testConstraint must be in
20379 : * implicit-AND form, must only contain immutable clauses, and must
20380 : * contain only Vars with varno = 1.
20381 : */
20382 : bool
20383 2874 : ConstraintImpliedByRelConstraint(Relation scanrel, List *testConstraint, List *provenConstraint)
20384 : {
20385 2874 : List *existConstraint = list_copy(provenConstraint);
20386 2874 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20387 : int num_check,
20388 : i;
20389 :
20390 2874 : num_check = (constr != NULL) ? constr->num_check : 0;
20391 3210 : for (i = 0; i < num_check; i++)
20392 : {
20393 : Node *cexpr;
20394 :
20395 : /*
20396 : * If this constraint hasn't been fully validated yet, we must ignore
20397 : * it here.
20398 : */
20399 336 : if (!constr->check[i].ccvalid)
20400 12 : continue;
20401 :
20402 : /*
20403 : * NOT ENFORCED constraints are always marked as invalid, which should
20404 : * have been ignored.
20405 : */
20406 : Assert(constr->check[i].ccenforced);
20407 :
20408 324 : cexpr = stringToNode(constr->check[i].ccbin);
20409 :
20410 : /*
20411 : * Run each expression through const-simplification and
20412 : * canonicalization. It is necessary, because we will be comparing it
20413 : * to similarly-processed partition constraint expressions, and may
20414 : * fail to detect valid matches without this.
20415 : */
20416 324 : cexpr = eval_const_expressions(NULL, cexpr);
20417 324 : cexpr = (Node *) canonicalize_qual((Expr *) cexpr, true);
20418 :
20419 324 : existConstraint = list_concat(existConstraint,
20420 324 : make_ands_implicit((Expr *) cexpr));
20421 : }
20422 :
20423 : /*
20424 : * Try to make the proof. Since we are comparing CHECK constraints, we
20425 : * need to use weak implication, i.e., we assume existConstraint is
20426 : * not-false and try to prove the same for testConstraint.
20427 : *
20428 : * Note that predicate_implied_by assumes its first argument is known
20429 : * immutable. That should always be true for both NOT NULL and partition
20430 : * constraints, so we don't test it here.
20431 : */
20432 2874 : return predicate_implied_by(testConstraint, existConstraint, true);
20433 : }
20434 :
20435 : /*
20436 : * QueuePartitionConstraintValidation
20437 : *
20438 : * Add an entry to wqueue to have the given partition constraint validated by
20439 : * Phase 3, for the given relation, and all its children.
20440 : *
20441 : * We first verify whether the given constraint is implied by pre-existing
20442 : * relation constraints; if it is, there's no need to scan the table to
20443 : * validate, so don't queue in that case.
20444 : */
20445 : static void
20446 1733 : QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
20447 : List *partConstraint,
20448 : bool validate_default)
20449 : {
20450 : /*
20451 : * Based on the table's existing constraints, determine whether or not we
20452 : * may skip scanning the table.
20453 : */
20454 1733 : if (PartConstraintImpliedByRelConstraint(scanrel, partConstraint))
20455 : {
20456 55 : if (!validate_default)
20457 41 : ereport(DEBUG1,
20458 : (errmsg_internal("partition constraint for table \"%s\" is implied by existing constraints",
20459 : RelationGetRelationName(scanrel))));
20460 : else
20461 14 : ereport(DEBUG1,
20462 : (errmsg_internal("updated partition constraint for default partition \"%s\" is implied by existing constraints",
20463 : RelationGetRelationName(scanrel))));
20464 55 : return;
20465 : }
20466 :
20467 : /*
20468 : * Constraints proved insufficient. For plain relations, queue a
20469 : * validation item now; for partitioned tables, recurse to process each
20470 : * partition.
20471 : */
20472 1678 : if (scanrel->rd_rel->relkind == RELKIND_RELATION)
20473 : {
20474 : AlteredTableInfo *tab;
20475 :
20476 : /* Grab a work queue entry. */
20477 1403 : tab = ATGetQueueEntry(wqueue, scanrel);
20478 : Assert(tab->partition_constraint == NULL);
20479 1403 : tab->partition_constraint = (Expr *) linitial(partConstraint);
20480 1403 : tab->validate_default = validate_default;
20481 : }
20482 275 : else if (scanrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20483 : {
20484 244 : PartitionDesc partdesc = RelationGetPartitionDesc(scanrel, true);
20485 : int i;
20486 :
20487 524 : for (i = 0; i < partdesc->nparts; i++)
20488 : {
20489 : Relation part_rel;
20490 : List *thisPartConstraint;
20491 :
20492 : /*
20493 : * This is the minimum lock we need to prevent deadlocks.
20494 : */
20495 280 : part_rel = table_open(partdesc->oids[i], AccessExclusiveLock);
20496 :
20497 : /*
20498 : * Adjust the constraint for scanrel so that it matches this
20499 : * partition's attribute numbers.
20500 : */
20501 : thisPartConstraint =
20502 280 : map_partition_varattnos(partConstraint, 1,
20503 : part_rel, scanrel);
20504 :
20505 280 : QueuePartitionConstraintValidation(wqueue, part_rel,
20506 : thisPartConstraint,
20507 : validate_default);
20508 280 : table_close(part_rel, NoLock); /* keep lock till commit */
20509 : }
20510 : }
20511 : }
20512 :
20513 : /*
20514 : * attachPartitionTable: attach a new partition to the partitioned table
20515 : *
20516 : * wqueue: the ALTER TABLE work queue; can be NULL when not running as part
20517 : * of an ALTER TABLE sequence.
20518 : * rel: partitioned relation;
20519 : * attachrel: relation of attached partition;
20520 : * bound: bounds of attached relation.
20521 : */
20522 : static void
20523 1920 : attachPartitionTable(List **wqueue, Relation rel, Relation attachrel, PartitionBoundSpec *bound)
20524 : {
20525 : /*
20526 : * Create an inheritance; the relevant checks are performed inside the
20527 : * function.
20528 : */
20529 1920 : CreateInheritance(attachrel, rel, true);
20530 :
20531 : /* Update the pg_class entry. */
20532 1848 : StorePartitionBound(attachrel, rel, bound);
20533 :
20534 : /* Ensure there exists a correct set of indexes in the partition. */
20535 1848 : AttachPartitionEnsureIndexes(wqueue, rel, attachrel);
20536 :
20537 : /* and triggers */
20538 1828 : CloneRowTriggersToPartition(rel, attachrel);
20539 :
20540 : /*
20541 : * Clone foreign key constraints. Callee is responsible for setting up
20542 : * for phase 3 constraint verification.
20543 : */
20544 1824 : CloneForeignKeyConstraints(wqueue, rel, attachrel);
20545 1812 : }
20546 :
20547 : /*
20548 : * ALTER TABLE <name> ATTACH PARTITION <partition-name> FOR VALUES
20549 : *
20550 : * Return the address of the newly attached partition.
20551 : */
20552 : static ObjectAddress
20553 1604 : ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd,
20554 : AlterTableUtilityContext *context)
20555 : {
20556 : Relation attachrel,
20557 : catalog;
20558 : List *attachrel_children;
20559 : List *partConstraint;
20560 : SysScanDesc scan;
20561 : ScanKeyData skey;
20562 : AttrNumber attno;
20563 : int natts;
20564 : TupleDesc tupleDesc;
20565 : ObjectAddress address;
20566 : const char *trigger_name;
20567 : Oid defaultPartOid;
20568 : List *partBoundConstraint;
20569 1604 : List *exceptpuboids = NIL;
20570 1604 : ParseState *pstate = make_parsestate(NULL);
20571 :
20572 1604 : pstate->p_sourcetext = context->queryString;
20573 :
20574 : /*
20575 : * We must lock the default partition if one exists, because attaching a
20576 : * new partition will change its partition constraint.
20577 : */
20578 : defaultPartOid =
20579 1604 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20580 1604 : if (OidIsValid(defaultPartOid))
20581 117 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20582 :
20583 1604 : attachrel = table_openrv(cmd->name, AccessExclusiveLock);
20584 :
20585 : /*
20586 : * XXX I think it'd be a good idea to grab locks on all tables referenced
20587 : * by FKs at this point also.
20588 : */
20589 :
20590 : /*
20591 : * Must be owner of both parent and source table -- parent was checked by
20592 : * ATSimplePermissions call in ATPrepCmd
20593 : */
20594 1600 : ATSimplePermissions(AT_AttachPartition, attachrel,
20595 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
20596 :
20597 : /* A partition can only have one parent */
20598 1596 : if (attachrel->rd_rel->relispartition)
20599 4 : ereport(ERROR,
20600 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20601 : errmsg("\"%s\" is already a partition",
20602 : RelationGetRelationName(attachrel))));
20603 :
20604 1592 : if (OidIsValid(attachrel->rd_rel->reloftype))
20605 4 : ereport(ERROR,
20606 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20607 : errmsg("cannot attach a typed table as partition")));
20608 :
20609 : /*
20610 : * Disallow attaching a partition if the table is referenced in a
20611 : * publication EXCEPT clause. Changing the partition hierarchy could alter
20612 : * the effective publication membership.
20613 : */
20614 1588 : exceptpuboids = GetRelationExcludedPublications(RelationGetRelid(attachrel));
20615 1588 : if (exceptpuboids != NIL)
20616 : {
20617 4 : bool first = true;
20618 : StringInfoData pubnames;
20619 :
20620 4 : initStringInfo(&pubnames);
20621 :
20622 12 : foreach_oid(pubid, exceptpuboids)
20623 : {
20624 4 : char *pubname = get_publication_name(pubid, false);
20625 :
20626 4 : if (!first)
20627 : {
20628 : /*
20629 : * translator: This is a separator in a list of publication
20630 : * names.
20631 : */
20632 0 : appendStringInfoString(&pubnames, _(", "));
20633 : }
20634 :
20635 4 : first = false;
20636 :
20637 4 : appendStringInfo(&pubnames, _("\"%s\""), pubname);
20638 : }
20639 :
20640 4 : ereport(ERROR,
20641 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20642 : errmsg_plural("cannot attach table \"%s\" as partition because it is referenced in publication %s EXCEPT clause",
20643 : "cannot attach table \"%s\" as partition because it is referenced in publications %s EXCEPT clause",
20644 : list_length(exceptpuboids),
20645 : RelationGetRelationName(attachrel),
20646 : pubnames.data),
20647 : errdetail("The publication EXCEPT clause cannot contain tables that are partitions."),
20648 : errhint("Change the publication's EXCEPT clause using ALTER PUBLICATION ... SET ALL TABLES."));
20649 : }
20650 :
20651 1584 : list_free(exceptpuboids);
20652 :
20653 : /*
20654 : * Table being attached should not already be part of inheritance; either
20655 : * as a child table...
20656 : */
20657 1584 : catalog = table_open(InheritsRelationId, AccessShareLock);
20658 1584 : ScanKeyInit(&skey,
20659 : Anum_pg_inherits_inhrelid,
20660 : BTEqualStrategyNumber, F_OIDEQ,
20661 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20662 1584 : scan = systable_beginscan(catalog, InheritsRelidSeqnoIndexId, true,
20663 : NULL, 1, &skey);
20664 1584 : if (HeapTupleIsValid(systable_getnext(scan)))
20665 4 : ereport(ERROR,
20666 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20667 : errmsg("cannot attach inheritance child as partition")));
20668 1580 : systable_endscan(scan);
20669 :
20670 : /* ...or as a parent table (except the case when it is partitioned) */
20671 1580 : ScanKeyInit(&skey,
20672 : Anum_pg_inherits_inhparent,
20673 : BTEqualStrategyNumber, F_OIDEQ,
20674 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20675 1580 : scan = systable_beginscan(catalog, InheritsParentIndexId, true, NULL,
20676 : 1, &skey);
20677 1580 : if (HeapTupleIsValid(systable_getnext(scan)) &&
20678 184 : attachrel->rd_rel->relkind == RELKIND_RELATION)
20679 4 : ereport(ERROR,
20680 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20681 : errmsg("cannot attach inheritance parent as partition")));
20682 1576 : systable_endscan(scan);
20683 1576 : table_close(catalog, AccessShareLock);
20684 :
20685 : /*
20686 : * Prevent circularity by seeing if rel is a partition of attachrel. (In
20687 : * particular, this disallows making a rel a partition of itself.)
20688 : *
20689 : * We do that by checking if rel is a member of the list of attachrel's
20690 : * partitions provided the latter is partitioned at all. We want to avoid
20691 : * having to construct this list again, so we request the strongest lock
20692 : * on all partitions. We need the strongest lock, because we may decide
20693 : * to scan them if we find out that the table being attached (or its leaf
20694 : * partitions) may contain rows that violate the partition constraint. If
20695 : * the table has a constraint that would prevent such rows, which by
20696 : * definition is present in all the partitions, we need not scan the
20697 : * table, nor its partitions. But we cannot risk a deadlock by taking a
20698 : * weaker lock now and the stronger one only when needed.
20699 : */
20700 1576 : attachrel_children = find_all_inheritors(RelationGetRelid(attachrel),
20701 : AccessExclusiveLock, NULL);
20702 1576 : if (list_member_oid(attachrel_children, RelationGetRelid(rel)))
20703 8 : ereport(ERROR,
20704 : (errcode(ERRCODE_DUPLICATE_TABLE),
20705 : errmsg("circular inheritance not allowed"),
20706 : errdetail("\"%s\" is already a child of \"%s\".",
20707 : RelationGetRelationName(rel),
20708 : RelationGetRelationName(attachrel))));
20709 :
20710 : /* If the parent is permanent, so must be all of its partitions. */
20711 1568 : if (rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
20712 1540 : attachrel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
20713 4 : ereport(ERROR,
20714 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20715 : errmsg("cannot attach a temporary relation as partition of permanent relation \"%s\"",
20716 : RelationGetRelationName(rel))));
20717 :
20718 : /* Temp parent cannot have a partition that is itself not a temp */
20719 1564 : if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20720 28 : attachrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
20721 12 : ereport(ERROR,
20722 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20723 : errmsg("cannot attach a permanent relation as partition of temporary relation \"%s\"",
20724 : RelationGetRelationName(rel))));
20725 :
20726 : /* If the parent is temp, it must belong to this session */
20727 1552 : if (RELATION_IS_OTHER_TEMP(rel))
20728 0 : ereport(ERROR,
20729 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20730 : errmsg("cannot attach as partition of temporary relation of another session")));
20731 :
20732 : /* Ditto for the partition */
20733 1552 : if (RELATION_IS_OTHER_TEMP(attachrel))
20734 0 : ereport(ERROR,
20735 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20736 : errmsg("cannot attach temporary relation of another session as partition")));
20737 :
20738 : /*
20739 : * Check if attachrel has any identity columns or any columns that aren't
20740 : * in the parent.
20741 : */
20742 1552 : tupleDesc = RelationGetDescr(attachrel);
20743 1552 : natts = tupleDesc->natts;
20744 5362 : for (attno = 1; attno <= natts; attno++)
20745 : {
20746 3838 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc, attno - 1);
20747 3838 : char *attributeName = NameStr(attribute->attname);
20748 :
20749 : /* Ignore dropped */
20750 3838 : if (attribute->attisdropped)
20751 404 : continue;
20752 :
20753 3434 : if (attribute->attidentity)
20754 16 : ereport(ERROR,
20755 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20756 : errmsg("table \"%s\" being attached contains an identity column \"%s\"",
20757 : RelationGetRelationName(attachrel), attributeName),
20758 : errdetail("The new partition may not contain an identity column."));
20759 :
20760 : /* Try to find the column in parent (matching on column name) */
20761 3418 : if (!SearchSysCacheExists2(ATTNAME,
20762 : ObjectIdGetDatum(RelationGetRelid(rel)),
20763 : CStringGetDatum(attributeName)))
20764 12 : ereport(ERROR,
20765 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20766 : errmsg("table \"%s\" contains column \"%s\" not found in parent \"%s\"",
20767 : RelationGetRelationName(attachrel), attributeName,
20768 : RelationGetRelationName(rel)),
20769 : errdetail("The new partition may contain only the columns present in parent.")));
20770 : }
20771 :
20772 : /*
20773 : * If child_rel has row-level triggers with transition tables, we
20774 : * currently don't allow it to become a partition. See also prohibitions
20775 : * in ATExecAddInherit() and CreateTrigger().
20776 : */
20777 1524 : trigger_name = FindTriggerIncompatibleWithInheritance(attachrel->trigdesc);
20778 1524 : if (trigger_name != NULL)
20779 4 : ereport(ERROR,
20780 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
20781 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming a partition",
20782 : trigger_name, RelationGetRelationName(attachrel)),
20783 : errdetail("ROW triggers with transition tables are not supported on partitions.")));
20784 :
20785 : /*
20786 : * Check that the new partition's bound is valid and does not overlap any
20787 : * of existing partitions of the parent - note that it does not return on
20788 : * error.
20789 : */
20790 1520 : check_new_partition_bound(RelationGetRelationName(attachrel), rel,
20791 : cmd->bound, pstate);
20792 :
20793 1496 : attachPartitionTable(wqueue, rel, attachrel, cmd->bound);
20794 :
20795 : /*
20796 : * Generate a partition constraint from the partition bound specification.
20797 : * If the parent itself is a partition, make sure to include its
20798 : * constraint as well.
20799 : */
20800 1388 : partBoundConstraint = get_qual_from_partbound(rel, cmd->bound);
20801 :
20802 : /*
20803 : * Use list_concat_copy() to avoid modifying partBoundConstraint in place,
20804 : * since it's needed later to construct the constraint expression for
20805 : * validating against the default partition, if any.
20806 : */
20807 1388 : partConstraint = list_concat_copy(partBoundConstraint,
20808 1388 : RelationGetPartitionQual(rel));
20809 :
20810 : /* Skip validation if there are no constraints to validate. */
20811 1388 : if (partConstraint)
20812 : {
20813 : /*
20814 : * Run the partition quals through const-simplification similar to
20815 : * check constraints. We skip canonicalize_qual, though, because
20816 : * partition quals should be in canonical form already.
20817 : */
20818 : partConstraint =
20819 1360 : (List *) eval_const_expressions(NULL,
20820 : (Node *) partConstraint);
20821 :
20822 : /* XXX this sure looks wrong */
20823 1360 : partConstraint = list_make1(make_ands_explicit(partConstraint));
20824 :
20825 : /*
20826 : * Adjust the generated constraint to match this partition's attribute
20827 : * numbers.
20828 : */
20829 1360 : partConstraint = map_partition_varattnos(partConstraint, 1, attachrel,
20830 : rel);
20831 :
20832 : /* Validate partition constraints against the table being attached. */
20833 1360 : QueuePartitionConstraintValidation(wqueue, attachrel, partConstraint,
20834 : false);
20835 : }
20836 :
20837 : /*
20838 : * If we're attaching a partition other than the default partition and a
20839 : * default one exists, then that partition's partition constraint changes,
20840 : * so add an entry to the work queue to validate it, too. (We must not do
20841 : * this when the partition being attached is the default one; we already
20842 : * did it above!)
20843 : */
20844 1388 : if (OidIsValid(defaultPartOid))
20845 : {
20846 : Relation defaultrel;
20847 : List *defPartConstraint;
20848 :
20849 : Assert(!cmd->bound->is_default);
20850 :
20851 : /* we already hold a lock on the default partition */
20852 93 : defaultrel = table_open(defaultPartOid, NoLock);
20853 : defPartConstraint =
20854 93 : get_proposed_default_constraint(partBoundConstraint);
20855 :
20856 : /*
20857 : * Map the Vars in the constraint expression from rel's attnos to
20858 : * defaultrel's.
20859 : */
20860 : defPartConstraint =
20861 93 : map_partition_varattnos(defPartConstraint,
20862 : 1, defaultrel, rel);
20863 93 : QueuePartitionConstraintValidation(wqueue, defaultrel,
20864 : defPartConstraint, true);
20865 :
20866 : /* keep our lock until commit. */
20867 93 : table_close(defaultrel, NoLock);
20868 : }
20869 :
20870 1388 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(attachrel));
20871 :
20872 : /*
20873 : * If the partition we just attached is partitioned itself, invalidate
20874 : * relcache for all descendent partitions too to ensure that their
20875 : * rd_partcheck expression trees are rebuilt; partitions already locked at
20876 : * the beginning of this function.
20877 : */
20878 1388 : if (attachrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20879 : {
20880 : ListCell *l;
20881 :
20882 711 : foreach(l, attachrel_children)
20883 : {
20884 482 : CacheInvalidateRelcacheByRelid(lfirst_oid(l));
20885 : }
20886 : }
20887 :
20888 : /* keep our lock until commit */
20889 1388 : table_close(attachrel, NoLock);
20890 :
20891 1388 : return address;
20892 : }
20893 :
20894 : /*
20895 : * AttachPartitionEnsureIndexes
20896 : * subroutine for ATExecAttachPartition to create/match indexes
20897 : *
20898 : * Enforce the indexing rule for partitioned tables during ALTER TABLE / ATTACH
20899 : * PARTITION: every partition must have an index attached to each index on the
20900 : * partitioned table.
20901 : */
20902 : static void
20903 1848 : AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
20904 : {
20905 : List *idxes;
20906 : List *attachRelIdxs;
20907 : Relation *attachrelIdxRels;
20908 : IndexInfo **attachInfos;
20909 : ListCell *cell;
20910 : MemoryContext cxt;
20911 : MemoryContext oldcxt;
20912 :
20913 1848 : cxt = AllocSetContextCreate(CurrentMemoryContext,
20914 : "AttachPartitionEnsureIndexes",
20915 : ALLOCSET_DEFAULT_SIZES);
20916 1848 : oldcxt = MemoryContextSwitchTo(cxt);
20917 :
20918 1848 : idxes = RelationGetIndexList(rel);
20919 1848 : attachRelIdxs = RelationGetIndexList(attachrel);
20920 1848 : attachrelIdxRels = palloc_array(Relation, list_length(attachRelIdxs));
20921 1848 : attachInfos = palloc_array(IndexInfo *, list_length(attachRelIdxs));
20922 :
20923 : /* Build arrays of all existing indexes and their IndexInfos */
20924 3965 : foreach_oid(cldIdxId, attachRelIdxs)
20925 : {
20926 269 : int i = foreach_current_index(cldIdxId);
20927 :
20928 269 : attachrelIdxRels[i] = index_open(cldIdxId, AccessShareLock);
20929 269 : attachInfos[i] = BuildIndexInfo(attachrelIdxRels[i]);
20930 : }
20931 :
20932 : /*
20933 : * If we're attaching a foreign table, we must fail if any of the indexes
20934 : * is a constraint index; otherwise, there's nothing to do here. Do this
20935 : * before starting work, to avoid wasting the effort of building a few
20936 : * non-unique indexes before coming across a unique one.
20937 : */
20938 1848 : if (attachrel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
20939 : {
20940 55 : foreach(cell, idxes)
20941 : {
20942 24 : Oid idx = lfirst_oid(cell);
20943 24 : Relation idxRel = index_open(idx, AccessShareLock);
20944 :
20945 24 : if (idxRel->rd_index->indisunique ||
20946 16 : idxRel->rd_index->indisprimary)
20947 8 : ereport(ERROR,
20948 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20949 : errmsg("cannot attach foreign table \"%s\" as partition of partitioned table \"%s\"",
20950 : RelationGetRelationName(attachrel),
20951 : RelationGetRelationName(rel)),
20952 : errdetail("Partitioned table \"%s\" contains unique indexes.",
20953 : RelationGetRelationName(rel))));
20954 16 : index_close(idxRel, AccessShareLock);
20955 : }
20956 :
20957 31 : goto out;
20958 : }
20959 :
20960 : /*
20961 : * For each index on the partitioned table, find a matching one in the
20962 : * partition-to-be; if one is not found, create one.
20963 : */
20964 2290 : foreach(cell, idxes)
20965 : {
20966 493 : Oid idx = lfirst_oid(cell);
20967 493 : Relation idxRel = index_open(idx, AccessShareLock);
20968 : IndexInfo *info;
20969 : AttrMap *attmap;
20970 493 : bool found = false;
20971 : Oid constraintOid;
20972 :
20973 : /*
20974 : * Ignore indexes in the partitioned table other than partitioned
20975 : * indexes.
20976 : */
20977 493 : if (idxRel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
20978 : {
20979 0 : index_close(idxRel, AccessShareLock);
20980 0 : continue;
20981 : }
20982 :
20983 : /* construct an indexinfo to compare existing indexes against */
20984 493 : info = BuildIndexInfo(idxRel);
20985 493 : attmap = build_attrmap_by_name(RelationGetDescr(attachrel),
20986 : RelationGetDescr(rel),
20987 : false);
20988 493 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(rel), idx);
20989 :
20990 : /*
20991 : * Scan the list of existing indexes in the partition-to-be, and mark
20992 : * the first matching, valid, unattached one we find, if any, as
20993 : * partition of the parent index. If we find one, we're done.
20994 : */
20995 533 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20996 : {
20997 197 : Oid cldIdxId = RelationGetRelid(attachrelIdxRels[i]);
20998 197 : Oid cldConstrOid = InvalidOid;
20999 :
21000 : /* does this index have a parent? if so, can't use it */
21001 197 : if (attachrelIdxRels[i]->rd_rel->relispartition)
21002 8 : continue;
21003 :
21004 : /* If this index is invalid, can't use it */
21005 189 : if (!attachrelIdxRels[i]->rd_index->indisvalid)
21006 4 : continue;
21007 :
21008 185 : if (CompareIndexInfo(attachInfos[i], info,
21009 185 : attachrelIdxRels[i]->rd_indcollation,
21010 185 : idxRel->rd_indcollation,
21011 185 : attachrelIdxRels[i]->rd_opfamily,
21012 185 : idxRel->rd_opfamily,
21013 : attmap))
21014 : {
21015 : /*
21016 : * If this index is being created in the parent because of a
21017 : * constraint, then the child needs to have a constraint also,
21018 : * so look for one. If there is no such constraint, this
21019 : * index is no good, so keep looking.
21020 : */
21021 161 : if (OidIsValid(constraintOid))
21022 : {
21023 : cldConstrOid =
21024 96 : get_relation_idx_constraint_oid(RelationGetRelid(attachrel),
21025 : cldIdxId);
21026 : /* no dice */
21027 96 : if (!OidIsValid(cldConstrOid))
21028 4 : continue;
21029 :
21030 : /* Ensure they're both the same type of constraint */
21031 184 : if (get_constraint_type(constraintOid) !=
21032 92 : get_constraint_type(cldConstrOid))
21033 0 : continue;
21034 : }
21035 :
21036 : /* bingo. */
21037 157 : IndexSetParentIndex(attachrelIdxRels[i], idx);
21038 157 : if (OidIsValid(constraintOid))
21039 92 : ConstraintSetParentConstraint(cldConstrOid, constraintOid,
21040 : RelationGetRelid(attachrel));
21041 157 : found = true;
21042 :
21043 157 : CommandCounterIncrement();
21044 157 : break;
21045 : }
21046 : }
21047 :
21048 : /*
21049 : * If no suitable index was found in the partition-to-be, create one
21050 : * now. Note that if this is a PK, not-null constraints must already
21051 : * exist.
21052 : */
21053 493 : if (!found)
21054 : {
21055 : IndexStmt *stmt;
21056 : Oid conOid;
21057 :
21058 336 : stmt = generateClonedIndexStmt(NULL,
21059 : idxRel, attmap,
21060 : &conOid);
21061 336 : DefineIndex(NULL,
21062 : RelationGetRelid(attachrel), stmt, InvalidOid,
21063 : RelationGetRelid(idxRel),
21064 : conOid,
21065 : -1,
21066 : true, false, false, false, false);
21067 : }
21068 :
21069 481 : index_close(idxRel, AccessShareLock);
21070 : }
21071 :
21072 1828 : out:
21073 : /* Clean up. */
21074 2089 : for (int i = 0; i < list_length(attachRelIdxs); i++)
21075 261 : index_close(attachrelIdxRels[i], AccessShareLock);
21076 1828 : MemoryContextSwitchTo(oldcxt);
21077 1828 : MemoryContextDelete(cxt);
21078 1828 : }
21079 :
21080 : /*
21081 : * CloneRowTriggersToPartition
21082 : * subroutine for ATExecAttachPartition/DefineRelation to create row
21083 : * triggers on partitions
21084 : */
21085 : static void
21086 2088 : CloneRowTriggersToPartition(Relation parent, Relation partition)
21087 : {
21088 : Relation pg_trigger;
21089 : ScanKeyData key;
21090 : SysScanDesc scan;
21091 : HeapTuple tuple;
21092 : MemoryContext perTupCxt;
21093 :
21094 2088 : ScanKeyInit(&key, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21095 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parent)));
21096 2088 : pg_trigger = table_open(TriggerRelationId, RowExclusiveLock);
21097 2088 : scan = systable_beginscan(pg_trigger, TriggerRelidNameIndexId,
21098 : true, NULL, 1, &key);
21099 :
21100 2088 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
21101 : "clone trig", ALLOCSET_SMALL_SIZES);
21102 :
21103 3317 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
21104 : {
21105 1233 : Form_pg_trigger trigForm = (Form_pg_trigger) GETSTRUCT(tuple);
21106 : CreateTrigStmt *trigStmt;
21107 1233 : Node *qual = NULL;
21108 : Datum value;
21109 : bool isnull;
21110 1233 : List *cols = NIL;
21111 1233 : List *trigargs = NIL;
21112 : MemoryContext oldcxt;
21113 :
21114 : /*
21115 : * Ignore statement-level triggers; those are not cloned.
21116 : */
21117 1233 : if (!TRIGGER_FOR_ROW(trigForm->tgtype))
21118 1102 : continue;
21119 :
21120 : /*
21121 : * Don't clone internal triggers, because the constraint cloning code
21122 : * will.
21123 : */
21124 1205 : if (trigForm->tgisinternal)
21125 1074 : continue;
21126 :
21127 : /*
21128 : * Complain if we find an unexpected trigger type.
21129 : */
21130 131 : if (!TRIGGER_FOR_BEFORE(trigForm->tgtype) &&
21131 107 : !TRIGGER_FOR_AFTER(trigForm->tgtype))
21132 0 : elog(ERROR, "unexpected trigger \"%s\" found",
21133 : NameStr(trigForm->tgname));
21134 :
21135 : /* Use short-lived context for CREATE TRIGGER */
21136 131 : oldcxt = MemoryContextSwitchTo(perTupCxt);
21137 :
21138 : /*
21139 : * If there is a WHEN clause, generate a 'cooked' version of it that's
21140 : * appropriate for the partition.
21141 : */
21142 131 : value = heap_getattr(tuple, Anum_pg_trigger_tgqual,
21143 : RelationGetDescr(pg_trigger), &isnull);
21144 131 : if (!isnull)
21145 : {
21146 4 : qual = stringToNode(TextDatumGetCString(value));
21147 4 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
21148 : partition, parent);
21149 4 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
21150 : partition, parent);
21151 : }
21152 :
21153 : /*
21154 : * If there is a column list, transform it to a list of column names.
21155 : * Note we don't need to map this list in any way ...
21156 : */
21157 131 : if (trigForm->tgattr.dim1 > 0)
21158 : {
21159 : int i;
21160 :
21161 8 : for (i = 0; i < trigForm->tgattr.dim1; i++)
21162 : {
21163 : Form_pg_attribute col;
21164 :
21165 4 : col = TupleDescAttr(parent->rd_att,
21166 4 : trigForm->tgattr.values[i] - 1);
21167 4 : cols = lappend(cols,
21168 4 : makeString(pstrdup(NameStr(col->attname))));
21169 : }
21170 : }
21171 :
21172 : /* Reconstruct trigger arguments list. */
21173 131 : if (trigForm->tgnargs > 0)
21174 : {
21175 : char *p;
21176 :
21177 36 : value = heap_getattr(tuple, Anum_pg_trigger_tgargs,
21178 : RelationGetDescr(pg_trigger), &isnull);
21179 36 : if (isnull)
21180 0 : elog(ERROR, "tgargs is null for trigger \"%s\" in partition \"%s\"",
21181 : NameStr(trigForm->tgname), RelationGetRelationName(partition));
21182 :
21183 36 : p = (char *) VARDATA_ANY(DatumGetByteaPP(value));
21184 :
21185 80 : for (int i = 0; i < trigForm->tgnargs; i++)
21186 : {
21187 44 : trigargs = lappend(trigargs, makeString(pstrdup(p)));
21188 44 : p += strlen(p) + 1;
21189 : }
21190 : }
21191 :
21192 131 : trigStmt = makeNode(CreateTrigStmt);
21193 131 : trigStmt->replace = false;
21194 131 : trigStmt->isconstraint = OidIsValid(trigForm->tgconstraint);
21195 131 : trigStmt->trigname = NameStr(trigForm->tgname);
21196 131 : trigStmt->relation = NULL;
21197 131 : trigStmt->funcname = NULL; /* passed separately */
21198 131 : trigStmt->args = trigargs;
21199 131 : trigStmt->row = true;
21200 131 : trigStmt->timing = trigForm->tgtype & TRIGGER_TYPE_TIMING_MASK;
21201 131 : trigStmt->events = trigForm->tgtype & TRIGGER_TYPE_EVENT_MASK;
21202 131 : trigStmt->columns = cols;
21203 131 : trigStmt->whenClause = NULL; /* passed separately */
21204 131 : trigStmt->transitionRels = NIL; /* not supported at present */
21205 131 : trigStmt->deferrable = trigForm->tgdeferrable;
21206 131 : trigStmt->initdeferred = trigForm->tginitdeferred;
21207 131 : trigStmt->constrrel = NULL; /* passed separately */
21208 :
21209 131 : CreateTriggerFiringOn(trigStmt, NULL, RelationGetRelid(partition),
21210 : trigForm->tgconstrrelid, InvalidOid, InvalidOid,
21211 : trigForm->tgfoid, trigForm->oid, qual,
21212 131 : false, true, trigForm->tgenabled);
21213 :
21214 127 : MemoryContextSwitchTo(oldcxt);
21215 127 : MemoryContextReset(perTupCxt);
21216 : }
21217 :
21218 2084 : MemoryContextDelete(perTupCxt);
21219 :
21220 2084 : systable_endscan(scan);
21221 2084 : table_close(pg_trigger, RowExclusiveLock);
21222 2084 : }
21223 :
21224 : /*
21225 : * ALTER TABLE DETACH PARTITION
21226 : *
21227 : * Return the address of the relation that is no longer a partition of rel.
21228 : *
21229 : * If concurrent mode is requested, we run in two transactions. A side-
21230 : * effect is that this command cannot run in a multi-part ALTER TABLE.
21231 : * Currently, that's enforced by the grammar.
21232 : *
21233 : * The strategy for concurrency is to first modify the partition's
21234 : * pg_inherit catalog row to make it visible to everyone that the
21235 : * partition is detached, lock the partition against writes, and commit
21236 : * the transaction; anyone who requests the partition descriptor from
21237 : * that point onwards has to ignore such a partition. In a second
21238 : * transaction, we wait until all transactions that could have seen the
21239 : * partition as attached are gone, then we remove the rest of partition
21240 : * metadata (pg_inherits and pg_class.relpartbounds).
21241 : */
21242 : static ObjectAddress
21243 373 : ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
21244 : RangeVar *name, bool concurrent)
21245 : {
21246 : Relation partRel;
21247 : ObjectAddress address;
21248 : Oid defaultPartOid;
21249 :
21250 : /*
21251 : * We must lock the default partition, because detaching this partition
21252 : * will change its partition constraint.
21253 : */
21254 : defaultPartOid =
21255 373 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
21256 373 : if (OidIsValid(defaultPartOid))
21257 : {
21258 : /*
21259 : * Concurrent detaching when a default partition exists is not
21260 : * supported. The main problem is that the default partition
21261 : * constraint would change. And there's a definitional problem: what
21262 : * should happen to the tuples that are being inserted that belong to
21263 : * the partition being detached? Putting them on the partition being
21264 : * detached would be wrong, since they'd become "lost" after the
21265 : * detaching completes but we cannot put them in the default partition
21266 : * either until we alter its partition constraint.
21267 : *
21268 : * I think we could solve this problem if we effected the constraint
21269 : * change before committing the first transaction. But the lock would
21270 : * have to remain AEL and it would cause concurrent query planning to
21271 : * be blocked, so changing it that way would be even worse.
21272 : */
21273 74 : if (concurrent)
21274 8 : ereport(ERROR,
21275 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21276 : errmsg("cannot detach partitions concurrently when a default partition exists")));
21277 66 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
21278 : }
21279 :
21280 : /*
21281 : * In concurrent mode, the partition is locked with share-update-exclusive
21282 : * in the first transaction. This allows concurrent transactions to be
21283 : * doing DML to the partition.
21284 : */
21285 365 : partRel = table_openrv(name, concurrent ? ShareUpdateExclusiveLock :
21286 : AccessExclusiveLock);
21287 :
21288 : /*
21289 : * Check inheritance conditions and either delete the pg_inherits row (in
21290 : * non-concurrent mode) or just set the inhdetachpending flag.
21291 : */
21292 357 : if (!concurrent)
21293 282 : RemoveInheritance(partRel, rel, false);
21294 : else
21295 75 : MarkInheritDetached(partRel, rel);
21296 :
21297 : /*
21298 : * Ensure that foreign keys still hold after this detach. This keeps
21299 : * locks on the referencing tables, which prevents concurrent transactions
21300 : * from adding rows that we wouldn't see. For this to work in concurrent
21301 : * mode, it is critical that the partition appears as no longer attached
21302 : * for the RI queries as soon as the first transaction commits.
21303 : */
21304 344 : ATDetachCheckNoForeignKeyRefs(partRel);
21305 :
21306 : /*
21307 : * Concurrent mode has to work harder; first we add a new constraint to
21308 : * the partition that matches the partition constraint. Then we close our
21309 : * existing transaction, and in a new one wait for all processes to catch
21310 : * up on the catalog updates we've done so far; at that point we can
21311 : * complete the operation.
21312 : */
21313 322 : if (concurrent)
21314 : {
21315 : Oid partrelid,
21316 : parentrelid;
21317 : LOCKTAG tag;
21318 : char *parentrelname;
21319 : char *partrelname;
21320 :
21321 : /*
21322 : * We're almost done now; the only traces that remain are the
21323 : * pg_inherits tuple and the partition's relpartbounds. Before we can
21324 : * remove those, we need to wait until all transactions that know that
21325 : * this is a partition are gone.
21326 : */
21327 :
21328 : /*
21329 : * Remember relation OIDs to re-acquire them later; and relation names
21330 : * too, for error messages if something is dropped in between.
21331 : */
21332 72 : partrelid = RelationGetRelid(partRel);
21333 72 : parentrelid = RelationGetRelid(rel);
21334 72 : parentrelname = MemoryContextStrdup(PortalContext,
21335 72 : RelationGetRelationName(rel));
21336 72 : partrelname = MemoryContextStrdup(PortalContext,
21337 72 : RelationGetRelationName(partRel));
21338 :
21339 : /* Invalidate relcache entries for the parent -- must be before close */
21340 72 : CacheInvalidateRelcache(rel);
21341 :
21342 72 : table_close(partRel, NoLock);
21343 72 : table_close(rel, NoLock);
21344 72 : tab->rel = NULL;
21345 :
21346 : /* Make updated catalog entry visible */
21347 72 : PopActiveSnapshot();
21348 72 : CommitTransactionCommand();
21349 :
21350 72 : StartTransactionCommand();
21351 :
21352 : /*
21353 : * Now wait. This ensures that all queries that were planned
21354 : * including the partition are finished before we remove the rest of
21355 : * catalog entries. We don't need or indeed want to acquire this
21356 : * lock, though -- that would block later queries.
21357 : *
21358 : * We don't need to concern ourselves with waiting for a lock on the
21359 : * partition itself, since we will acquire AccessExclusiveLock below.
21360 : */
21361 72 : SET_LOCKTAG_RELATION(tag, MyDatabaseId, parentrelid);
21362 72 : WaitForLockersMultiple(list_make1(&tag), AccessExclusiveLock, false);
21363 :
21364 : /*
21365 : * Now acquire locks in both relations again. Note they may have been
21366 : * removed in the meantime, so care is required.
21367 : */
21368 47 : rel = try_relation_open(parentrelid, ShareUpdateExclusiveLock);
21369 47 : partRel = try_relation_open(partrelid, AccessExclusiveLock);
21370 :
21371 : /* If the relations aren't there, something bad happened; bail out */
21372 47 : if (rel == NULL)
21373 : {
21374 0 : if (partRel != NULL) /* shouldn't happen */
21375 0 : elog(WARNING, "dangling partition \"%s\" remains, can't fix",
21376 : partrelname);
21377 0 : ereport(ERROR,
21378 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21379 : errmsg("partitioned table \"%s\" was removed concurrently",
21380 : parentrelname)));
21381 : }
21382 47 : if (partRel == NULL)
21383 0 : ereport(ERROR,
21384 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21385 : errmsg("partition \"%s\" was removed concurrently", partrelname)));
21386 :
21387 47 : tab->rel = rel;
21388 : }
21389 :
21390 : /*
21391 : * Detaching the partition might involve TOAST table access, so ensure we
21392 : * have a valid snapshot.
21393 : */
21394 297 : PushActiveSnapshot(GetTransactionSnapshot());
21395 :
21396 : /* Do the final part of detaching */
21397 297 : DetachPartitionFinalize(rel, partRel, concurrent, defaultPartOid);
21398 :
21399 296 : PopActiveSnapshot();
21400 :
21401 296 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21402 :
21403 : /* keep our lock until commit */
21404 296 : table_close(partRel, NoLock);
21405 :
21406 296 : return address;
21407 : }
21408 :
21409 : /*
21410 : * Second part of ALTER TABLE .. DETACH.
21411 : *
21412 : * This is separate so that it can be run independently when the second
21413 : * transaction of the concurrent algorithm fails (crash or abort).
21414 : */
21415 : static void
21416 677 : DetachPartitionFinalize(Relation rel, Relation partRel, bool concurrent,
21417 : Oid defaultPartOid)
21418 : {
21419 : Relation classRel;
21420 : List *fks;
21421 : ListCell *cell;
21422 : List *indexes;
21423 : Datum new_val[Natts_pg_class];
21424 : bool new_null[Natts_pg_class],
21425 : new_repl[Natts_pg_class];
21426 : HeapTuple tuple,
21427 : newtuple;
21428 677 : Relation trigrel = NULL;
21429 677 : List *fkoids = NIL;
21430 :
21431 677 : if (concurrent)
21432 : {
21433 : /*
21434 : * We can remove the pg_inherits row now. (In the non-concurrent case,
21435 : * this was already done).
21436 : */
21437 54 : RemoveInheritance(partRel, rel, true);
21438 : }
21439 :
21440 : /* Drop any triggers that were cloned on creation/attach. */
21441 677 : DropClonedTriggersFromPartition(RelationGetRelid(partRel));
21442 :
21443 : /*
21444 : * Detach any foreign keys that are inherited. This includes creating
21445 : * additional action triggers.
21446 : */
21447 677 : fks = copyObject(RelationGetFKeyList(partRel));
21448 677 : if (fks != NIL)
21449 60 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
21450 :
21451 : /*
21452 : * It's possible that the partition being detached has a foreign key that
21453 : * references a partitioned table. When that happens, there are multiple
21454 : * pg_constraint rows for the partition: one points to the partitioned
21455 : * table itself, while the others point to each of its partitions. Only
21456 : * the topmost one is to be considered here; the child constraints must be
21457 : * left alone, because conceptually those aren't coming from our parent
21458 : * partitioned table, but from this partition itself.
21459 : *
21460 : * We implement this by collecting all the constraint OIDs in a first scan
21461 : * of the FK array, and skipping in the loop below those constraints whose
21462 : * parents are listed here.
21463 : */
21464 1470 : foreach_node(ForeignKeyCacheInfo, fk, fks)
21465 116 : fkoids = lappend_oid(fkoids, fk->conoid);
21466 :
21467 793 : foreach(cell, fks)
21468 : {
21469 116 : ForeignKeyCacheInfo *fk = lfirst(cell);
21470 : HeapTuple contup;
21471 : Form_pg_constraint conform;
21472 :
21473 116 : contup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
21474 116 : if (!HeapTupleIsValid(contup))
21475 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
21476 116 : conform = (Form_pg_constraint) GETSTRUCT(contup);
21477 :
21478 : /*
21479 : * Consider only inherited foreign keys, and only if their parents
21480 : * aren't in the list.
21481 : */
21482 116 : if (conform->contype != CONSTRAINT_FOREIGN ||
21483 216 : !OidIsValid(conform->conparentid) ||
21484 100 : list_member_oid(fkoids, conform->conparentid))
21485 : {
21486 44 : ReleaseSysCache(contup);
21487 44 : continue;
21488 : }
21489 :
21490 : /*
21491 : * The constraint on this table must be marked no longer a child of
21492 : * the parent's constraint, as do its check triggers.
21493 : */
21494 72 : ConstraintSetParentConstraint(fk->conoid, InvalidOid, InvalidOid);
21495 :
21496 : /*
21497 : * Also, look up the partition's "check" triggers corresponding to the
21498 : * ENFORCED constraint being detached and detach them from the parent
21499 : * triggers. NOT ENFORCED constraints do not have these triggers;
21500 : * therefore, this step is not needed.
21501 : */
21502 72 : if (fk->conenforced)
21503 : {
21504 : Oid insertTriggerOid,
21505 : updateTriggerOid;
21506 :
21507 72 : GetForeignKeyCheckTriggers(trigrel,
21508 : fk->conoid, fk->confrelid, fk->conrelid,
21509 : &insertTriggerOid, &updateTriggerOid);
21510 : Assert(OidIsValid(insertTriggerOid));
21511 72 : TriggerSetParentTrigger(trigrel, insertTriggerOid, InvalidOid,
21512 : RelationGetRelid(partRel));
21513 : Assert(OidIsValid(updateTriggerOid));
21514 72 : TriggerSetParentTrigger(trigrel, updateTriggerOid, InvalidOid,
21515 : RelationGetRelid(partRel));
21516 : }
21517 :
21518 : /*
21519 : * Lastly, create the action triggers on the referenced table, using
21520 : * addFkRecurseReferenced, which requires some elaborate setup (so put
21521 : * it in a separate block). While at it, if the table is partitioned,
21522 : * that function will recurse to create the pg_constraint rows and
21523 : * action triggers for each partition.
21524 : *
21525 : * Note there's no need to do addFkConstraint() here, because the
21526 : * pg_constraint row already exists.
21527 : */
21528 : {
21529 : Constraint *fkconstraint;
21530 : int numfks;
21531 : AttrNumber conkey[INDEX_MAX_KEYS];
21532 : AttrNumber confkey[INDEX_MAX_KEYS];
21533 : Oid conpfeqop[INDEX_MAX_KEYS];
21534 : Oid conppeqop[INDEX_MAX_KEYS];
21535 : Oid conffeqop[INDEX_MAX_KEYS];
21536 : int numfkdelsetcols;
21537 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
21538 : Relation refdRel;
21539 :
21540 72 : DeconstructFkConstraintRow(contup,
21541 : &numfks,
21542 : conkey,
21543 : confkey,
21544 : conpfeqop,
21545 : conppeqop,
21546 : conffeqop,
21547 : &numfkdelsetcols,
21548 : confdelsetcols);
21549 :
21550 : /* Create a synthetic node we'll use throughout */
21551 72 : fkconstraint = makeNode(Constraint);
21552 72 : fkconstraint->contype = CONSTRAINT_FOREIGN;
21553 72 : fkconstraint->conname = pstrdup(NameStr(conform->conname));
21554 72 : fkconstraint->deferrable = conform->condeferrable;
21555 72 : fkconstraint->initdeferred = conform->condeferred;
21556 72 : fkconstraint->is_enforced = conform->conenforced;
21557 72 : fkconstraint->skip_validation = true;
21558 72 : fkconstraint->initially_valid = conform->convalidated;
21559 : /* a few irrelevant fields omitted here */
21560 72 : fkconstraint->pktable = NULL;
21561 72 : fkconstraint->fk_attrs = NIL;
21562 72 : fkconstraint->pk_attrs = NIL;
21563 72 : fkconstraint->fk_matchtype = conform->confmatchtype;
21564 72 : fkconstraint->fk_upd_action = conform->confupdtype;
21565 72 : fkconstraint->fk_del_action = conform->confdeltype;
21566 72 : fkconstraint->fk_del_set_cols = NIL;
21567 72 : fkconstraint->old_conpfeqop = NIL;
21568 72 : fkconstraint->old_pktable_oid = InvalidOid;
21569 72 : fkconstraint->location = -1;
21570 :
21571 : /* set up colnames, used to generate the constraint name */
21572 176 : for (int i = 0; i < numfks; i++)
21573 : {
21574 : Form_pg_attribute att;
21575 :
21576 104 : att = TupleDescAttr(RelationGetDescr(partRel),
21577 104 : conkey[i] - 1);
21578 :
21579 104 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
21580 104 : makeString(NameStr(att->attname)));
21581 : }
21582 :
21583 72 : refdRel = table_open(fk->confrelid, ShareRowExclusiveLock);
21584 :
21585 72 : addFkRecurseReferenced(fkconstraint, partRel,
21586 : refdRel,
21587 : conform->conindid,
21588 : fk->conoid,
21589 : numfks,
21590 : confkey,
21591 : conkey,
21592 : conpfeqop,
21593 : conppeqop,
21594 : conffeqop,
21595 : numfkdelsetcols,
21596 : confdelsetcols,
21597 : true,
21598 : InvalidOid, InvalidOid,
21599 72 : conform->conperiod);
21600 72 : table_close(refdRel, NoLock); /* keep lock till end of xact */
21601 : }
21602 :
21603 72 : ReleaseSysCache(contup);
21604 : }
21605 677 : list_free_deep(fks);
21606 677 : if (trigrel)
21607 60 : table_close(trigrel, RowExclusiveLock);
21608 :
21609 : /*
21610 : * Any sub-constraints that are in the referenced-side of a larger
21611 : * constraint have to be removed. This partition is no longer part of the
21612 : * key space of the constraint.
21613 : */
21614 732 : foreach(cell, GetParentedForeignKeyRefs(partRel))
21615 : {
21616 56 : Oid constrOid = lfirst_oid(cell);
21617 : ObjectAddress constraint;
21618 :
21619 56 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21620 56 : deleteDependencyRecordsForClass(ConstraintRelationId,
21621 : constrOid,
21622 : ConstraintRelationId,
21623 : DEPENDENCY_INTERNAL);
21624 56 : CommandCounterIncrement();
21625 :
21626 56 : ObjectAddressSet(constraint, ConstraintRelationId, constrOid);
21627 56 : performDeletion(&constraint, DROP_RESTRICT, 0);
21628 : }
21629 :
21630 : /* Now we can detach indexes */
21631 676 : indexes = RelationGetIndexList(partRel);
21632 983 : foreach(cell, indexes)
21633 : {
21634 307 : Oid idxid = lfirst_oid(cell);
21635 : Oid parentidx;
21636 : Relation idx;
21637 : Oid constrOid;
21638 : Oid parentConstrOid;
21639 :
21640 307 : if (!has_superclass(idxid))
21641 9 : continue;
21642 :
21643 298 : parentidx = get_partition_parent(idxid, false);
21644 : Assert((IndexGetRelation(parentidx, false) == RelationGetRelid(rel)));
21645 :
21646 298 : idx = index_open(idxid, AccessExclusiveLock);
21647 298 : IndexSetParentIndex(idx, InvalidOid);
21648 :
21649 : /*
21650 : * If there's a constraint associated with the index, detach it too.
21651 : * Careful: it is possible for a constraint index in a partition to be
21652 : * the child of a non-constraint index, so verify whether the parent
21653 : * index does actually have a constraint.
21654 : */
21655 298 : constrOid = get_relation_idx_constraint_oid(RelationGetRelid(partRel),
21656 : idxid);
21657 298 : parentConstrOid = get_relation_idx_constraint_oid(RelationGetRelid(rel),
21658 : parentidx);
21659 298 : if (OidIsValid(parentConstrOid) && OidIsValid(constrOid))
21660 135 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21661 :
21662 298 : index_close(idx, NoLock);
21663 : }
21664 :
21665 : /* Update pg_class tuple */
21666 676 : classRel = table_open(RelationRelationId, RowExclusiveLock);
21667 676 : tuple = SearchSysCacheCopy1(RELOID,
21668 : ObjectIdGetDatum(RelationGetRelid(partRel)));
21669 676 : if (!HeapTupleIsValid(tuple))
21670 0 : elog(ERROR, "cache lookup failed for relation %u",
21671 : RelationGetRelid(partRel));
21672 : Assert(((Form_pg_class) GETSTRUCT(tuple))->relispartition);
21673 :
21674 : /* Clear relpartbound and reset relispartition */
21675 676 : memset(new_val, 0, sizeof(new_val));
21676 676 : memset(new_null, false, sizeof(new_null));
21677 676 : memset(new_repl, false, sizeof(new_repl));
21678 676 : new_val[Anum_pg_class_relpartbound - 1] = (Datum) 0;
21679 676 : new_null[Anum_pg_class_relpartbound - 1] = true;
21680 676 : new_repl[Anum_pg_class_relpartbound - 1] = true;
21681 676 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
21682 : new_val, new_null, new_repl);
21683 :
21684 676 : ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = false;
21685 676 : CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
21686 676 : heap_freetuple(newtuple);
21687 676 : table_close(classRel, RowExclusiveLock);
21688 :
21689 : /*
21690 : * Drop identity property from all identity columns of partition.
21691 : */
21692 2192 : for (int attno = 0; attno < RelationGetNumberOfAttributes(partRel); attno++)
21693 : {
21694 1516 : Form_pg_attribute attr = TupleDescAttr(partRel->rd_att, attno);
21695 :
21696 1516 : if (!attr->attisdropped && attr->attidentity)
21697 20 : ATExecDropIdentity(partRel, NameStr(attr->attname), false,
21698 : AccessExclusiveLock, true, true);
21699 : }
21700 :
21701 676 : if (OidIsValid(defaultPartOid))
21702 : {
21703 : /*
21704 : * If the relation being detached is the default partition itself,
21705 : * remove it from the parent's pg_partitioned_table entry.
21706 : *
21707 : * If not, we must invalidate default partition's relcache entry, as
21708 : * in StorePartitionBound: its partition constraint depends on every
21709 : * other partition's partition constraint.
21710 : */
21711 159 : if (RelationGetRelid(partRel) == defaultPartOid)
21712 29 : update_default_partition_oid(RelationGetRelid(rel), InvalidOid);
21713 : else
21714 130 : CacheInvalidateRelcacheByRelid(defaultPartOid);
21715 : }
21716 :
21717 : /*
21718 : * Invalidate the parent's relcache so that the partition is no longer
21719 : * included in its partition descriptor.
21720 : */
21721 676 : CacheInvalidateRelcache(rel);
21722 :
21723 : /*
21724 : * If the partition we just detached is partitioned itself, invalidate
21725 : * relcache for all descendent partitions too to ensure that their
21726 : * rd_partcheck expression trees are rebuilt; must lock partitions before
21727 : * doing so, using the same lockmode as what partRel has been locked with
21728 : * by the caller.
21729 : */
21730 676 : if (partRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
21731 : {
21732 : List *children;
21733 :
21734 41 : children = find_all_inheritors(RelationGetRelid(partRel),
21735 : AccessExclusiveLock, NULL);
21736 135 : foreach(cell, children)
21737 : {
21738 94 : CacheInvalidateRelcacheByRelid(lfirst_oid(cell));
21739 : }
21740 : }
21741 676 : }
21742 :
21743 : /*
21744 : * ALTER TABLE ... DETACH PARTITION ... FINALIZE
21745 : *
21746 : * To use when a DETACH PARTITION command previously did not run to
21747 : * completion; this completes the detaching process.
21748 : */
21749 : static ObjectAddress
21750 7 : ATExecDetachPartitionFinalize(Relation rel, RangeVar *name)
21751 : {
21752 : Relation partRel;
21753 : ObjectAddress address;
21754 7 : Snapshot snap = GetActiveSnapshot();
21755 :
21756 7 : partRel = table_openrv(name, AccessExclusiveLock);
21757 :
21758 : /*
21759 : * Wait until existing snapshots are gone. This is important if the
21760 : * second transaction of DETACH PARTITION CONCURRENTLY is canceled: the
21761 : * user could immediately run DETACH FINALIZE without actually waiting for
21762 : * existing transactions. We must not complete the detach action until
21763 : * all such queries are complete (otherwise we would present them with an
21764 : * inconsistent view of catalogs).
21765 : */
21766 7 : WaitForOlderSnapshots(snap->xmin, false);
21767 :
21768 7 : DetachPartitionFinalize(rel, partRel, true, InvalidOid);
21769 :
21770 7 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21771 :
21772 7 : table_close(partRel, NoLock);
21773 :
21774 7 : return address;
21775 : }
21776 :
21777 : /*
21778 : * DropClonedTriggersFromPartition
21779 : * subroutine for ATExecDetachPartition to remove any triggers that were
21780 : * cloned to the partition when it was created-as-partition or attached.
21781 : * This undoes what CloneRowTriggersToPartition did.
21782 : */
21783 : static void
21784 677 : DropClonedTriggersFromPartition(Oid partitionId)
21785 : {
21786 : ScanKeyData skey;
21787 : SysScanDesc scan;
21788 : HeapTuple trigtup;
21789 : Relation tgrel;
21790 : ObjectAddresses *objects;
21791 :
21792 677 : objects = new_object_addresses();
21793 :
21794 : /*
21795 : * Scan pg_trigger to search for all triggers on this rel.
21796 : */
21797 677 : ScanKeyInit(&skey, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21798 : F_OIDEQ, ObjectIdGetDatum(partitionId));
21799 677 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
21800 677 : scan = systable_beginscan(tgrel, TriggerRelidNameIndexId,
21801 : true, NULL, 1, &skey);
21802 1013 : while (HeapTupleIsValid(trigtup = systable_getnext(scan)))
21803 : {
21804 336 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(trigtup);
21805 : ObjectAddress trig;
21806 :
21807 : /* Ignore triggers that weren't cloned */
21808 336 : if (!OidIsValid(pg_trigger->tgparentid))
21809 296 : continue;
21810 :
21811 : /*
21812 : * Ignore internal triggers that are implementation objects of foreign
21813 : * keys, because these will be detached when the foreign keys
21814 : * themselves are.
21815 : */
21816 280 : if (OidIsValid(pg_trigger->tgconstrrelid))
21817 240 : continue;
21818 :
21819 : /*
21820 : * This is ugly, but necessary: remove the dependency markings on the
21821 : * trigger so that it can be removed.
21822 : */
21823 40 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21824 : TriggerRelationId,
21825 : DEPENDENCY_PARTITION_PRI);
21826 40 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21827 : RelationRelationId,
21828 : DEPENDENCY_PARTITION_SEC);
21829 :
21830 : /* remember this trigger to remove it below */
21831 40 : ObjectAddressSet(trig, TriggerRelationId, pg_trigger->oid);
21832 40 : add_exact_object_address(&trig, objects);
21833 : }
21834 :
21835 : /* make the dependency removal visible to the deletion below */
21836 677 : CommandCounterIncrement();
21837 677 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
21838 :
21839 : /* done */
21840 677 : free_object_addresses(objects);
21841 677 : systable_endscan(scan);
21842 677 : table_close(tgrel, RowExclusiveLock);
21843 677 : }
21844 :
21845 : /*
21846 : * Before acquiring lock on an index, acquire the same lock on the owning
21847 : * table.
21848 : */
21849 : struct AttachIndexCallbackState
21850 : {
21851 : Oid partitionOid;
21852 : Oid parentTblOid;
21853 : bool lockedParentTbl;
21854 : };
21855 :
21856 : static void
21857 287 : RangeVarCallbackForAttachIndex(const RangeVar *rv, Oid relOid, Oid oldRelOid,
21858 : void *arg)
21859 : {
21860 : struct AttachIndexCallbackState *state;
21861 : Form_pg_class classform;
21862 : HeapTuple tuple;
21863 :
21864 287 : state = (struct AttachIndexCallbackState *) arg;
21865 :
21866 287 : if (!state->lockedParentTbl)
21867 : {
21868 269 : LockRelationOid(state->parentTblOid, AccessShareLock);
21869 269 : state->lockedParentTbl = true;
21870 : }
21871 :
21872 : /*
21873 : * If we previously locked some other heap, and the name we're looking up
21874 : * no longer refers to an index on that relation, release the now-useless
21875 : * lock. XXX maybe we should do *after* we verify whether the index does
21876 : * not actually belong to the same relation ...
21877 : */
21878 287 : if (relOid != oldRelOid && OidIsValid(state->partitionOid))
21879 : {
21880 0 : UnlockRelationOid(state->partitionOid, AccessShareLock);
21881 0 : state->partitionOid = InvalidOid;
21882 : }
21883 :
21884 : /* Didn't find a relation, so no need for locking or permission checks. */
21885 287 : if (!OidIsValid(relOid))
21886 4 : return;
21887 :
21888 283 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
21889 283 : if (!HeapTupleIsValid(tuple))
21890 0 : return; /* concurrently dropped, so nothing to do */
21891 283 : classform = (Form_pg_class) GETSTRUCT(tuple);
21892 283 : if (classform->relkind != RELKIND_PARTITIONED_INDEX &&
21893 214 : classform->relkind != RELKIND_INDEX)
21894 4 : ereport(ERROR,
21895 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21896 : errmsg("\"%s\" is not an index", rv->relname)));
21897 279 : ReleaseSysCache(tuple);
21898 :
21899 : /*
21900 : * Since we need only examine the heap's tupledesc, an access share lock
21901 : * on it (preventing any DDL) is sufficient.
21902 : */
21903 279 : state->partitionOid = IndexGetRelation(relOid, false);
21904 279 : LockRelationOid(state->partitionOid, AccessShareLock);
21905 : }
21906 :
21907 : /*
21908 : * ALTER INDEX i1 ATTACH PARTITION i2
21909 : */
21910 : static ObjectAddress
21911 269 : ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx, RangeVar *name)
21912 : {
21913 : Relation partIdx;
21914 : Relation partTbl;
21915 : Relation parentTbl;
21916 : ObjectAddress address;
21917 : Oid partIdxId;
21918 : Oid currParent;
21919 : struct AttachIndexCallbackState state;
21920 :
21921 : /*
21922 : * We need to obtain lock on the index 'name' to modify it, but we also
21923 : * need to read its owning table's tuple descriptor -- so we need to lock
21924 : * both. To avoid deadlocks, obtain lock on the table before doing so on
21925 : * the index. Furthermore, we need to examine the parent table of the
21926 : * partition, so lock that one too.
21927 : */
21928 269 : state.partitionOid = InvalidOid;
21929 269 : state.parentTblOid = parentIdx->rd_index->indrelid;
21930 269 : state.lockedParentTbl = false;
21931 : partIdxId =
21932 269 : RangeVarGetRelidExtended(name, AccessExclusiveLock, 0,
21933 : RangeVarCallbackForAttachIndex,
21934 : &state);
21935 : /* Not there? */
21936 261 : if (!OidIsValid(partIdxId))
21937 0 : ereport(ERROR,
21938 : (errcode(ERRCODE_UNDEFINED_OBJECT),
21939 : errmsg("index \"%s\" does not exist", name->relname)));
21940 :
21941 : /* no deadlock risk: RangeVarGetRelidExtended already acquired the lock */
21942 261 : partIdx = relation_open(partIdxId, AccessExclusiveLock);
21943 :
21944 : /* we already hold locks on both tables, so this is safe: */
21945 261 : parentTbl = relation_open(parentIdx->rd_index->indrelid, AccessShareLock);
21946 261 : partTbl = relation_open(partIdx->rd_index->indrelid, NoLock);
21947 :
21948 261 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partIdx));
21949 :
21950 : /*
21951 : * Check if the index is already attached to the correct parent,
21952 : * ultimately attempting one round of validation if already the case.
21953 : */
21954 522 : currParent = partIdx->rd_rel->relispartition ?
21955 261 : get_partition_parent(partIdxId, false) : InvalidOid;
21956 261 : if (currParent != RelationGetRelid(parentIdx))
21957 : {
21958 : IndexInfo *childInfo;
21959 : IndexInfo *parentInfo;
21960 : AttrMap *attmap;
21961 : bool found;
21962 : int i;
21963 : PartitionDesc partDesc;
21964 : Oid constraintOid,
21965 237 : cldConstrId = InvalidOid;
21966 :
21967 : /*
21968 : * If this partition already has an index attached, refuse the
21969 : * operation.
21970 : */
21971 237 : refuseDupeIndexAttach(parentIdx, partIdx, partTbl);
21972 :
21973 233 : if (OidIsValid(currParent))
21974 0 : ereport(ERROR,
21975 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21976 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21977 : RelationGetRelationName(partIdx),
21978 : RelationGetRelationName(parentIdx)),
21979 : errdetail("Index \"%s\" is already attached to another index.",
21980 : RelationGetRelationName(partIdx))));
21981 :
21982 : /* Make sure it indexes a partition of the other index's table */
21983 233 : partDesc = RelationGetPartitionDesc(parentTbl, true);
21984 233 : found = false;
21985 352 : for (i = 0; i < partDesc->nparts; i++)
21986 : {
21987 348 : if (partDesc->oids[i] == state.partitionOid)
21988 : {
21989 229 : found = true;
21990 229 : break;
21991 : }
21992 : }
21993 233 : if (!found)
21994 4 : ereport(ERROR,
21995 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21996 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21997 : RelationGetRelationName(partIdx),
21998 : RelationGetRelationName(parentIdx)),
21999 : errdetail("Index \"%s\" is not an index on any partition of table \"%s\".",
22000 : RelationGetRelationName(partIdx),
22001 : RelationGetRelationName(parentTbl))));
22002 :
22003 : /* Ensure the indexes are compatible */
22004 229 : childInfo = BuildIndexInfo(partIdx);
22005 229 : parentInfo = BuildIndexInfo(parentIdx);
22006 229 : attmap = build_attrmap_by_name(RelationGetDescr(partTbl),
22007 : RelationGetDescr(parentTbl),
22008 : false);
22009 229 : if (!CompareIndexInfo(childInfo, parentInfo,
22010 229 : partIdx->rd_indcollation,
22011 229 : parentIdx->rd_indcollation,
22012 229 : partIdx->rd_opfamily,
22013 229 : parentIdx->rd_opfamily,
22014 : attmap))
22015 28 : ereport(ERROR,
22016 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
22017 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
22018 : RelationGetRelationName(partIdx),
22019 : RelationGetRelationName(parentIdx)),
22020 : errdetail("The index definitions do not match.")));
22021 :
22022 : /*
22023 : * If there is a constraint in the parent, make sure there is one in
22024 : * the child too.
22025 : */
22026 201 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(parentTbl),
22027 : RelationGetRelid(parentIdx));
22028 :
22029 201 : if (OidIsValid(constraintOid))
22030 : {
22031 65 : cldConstrId = get_relation_idx_constraint_oid(RelationGetRelid(partTbl),
22032 : partIdxId);
22033 65 : if (!OidIsValid(cldConstrId))
22034 4 : ereport(ERROR,
22035 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
22036 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
22037 : RelationGetRelationName(partIdx),
22038 : RelationGetRelationName(parentIdx)),
22039 : errdetail("The index \"%s\" belongs to a constraint in table \"%s\" but no constraint exists for index \"%s\".",
22040 : RelationGetRelationName(parentIdx),
22041 : RelationGetRelationName(parentTbl),
22042 : RelationGetRelationName(partIdx))));
22043 : }
22044 :
22045 : /*
22046 : * If it's a primary key, make sure the columns in the partition are
22047 : * NOT NULL.
22048 : */
22049 197 : if (parentIdx->rd_index->indisprimary)
22050 55 : verifyPartitionIndexNotNull(childInfo, partTbl);
22051 :
22052 : /* All good -- do it */
22053 197 : IndexSetParentIndex(partIdx, RelationGetRelid(parentIdx));
22054 197 : if (OidIsValid(constraintOid))
22055 61 : ConstraintSetParentConstraint(cldConstrId, constraintOid,
22056 : RelationGetRelid(partTbl));
22057 :
22058 197 : free_attrmap(attmap);
22059 :
22060 197 : validatePartitionedIndex(parentIdx, parentTbl);
22061 : }
22062 24 : else if (!parentIdx->rd_index->indisvalid)
22063 : {
22064 : /*
22065 : * The index is attached, but the parent is still invalid; see if it
22066 : * can be validated now.
22067 : */
22068 12 : validatePartitionedIndex(parentIdx, parentTbl);
22069 : }
22070 :
22071 221 : relation_close(parentTbl, AccessShareLock);
22072 : /* keep these locks till commit */
22073 221 : relation_close(partTbl, NoLock);
22074 221 : relation_close(partIdx, NoLock);
22075 :
22076 221 : return address;
22077 : }
22078 :
22079 : /*
22080 : * Verify whether the given partition already contains an index attached
22081 : * to the given partitioned index. If so, raise an error.
22082 : */
22083 : static void
22084 237 : refuseDupeIndexAttach(Relation parentIdx, Relation partIdx, Relation partitionTbl)
22085 : {
22086 : Oid existingIdx;
22087 :
22088 237 : existingIdx = index_get_partition(partitionTbl,
22089 : RelationGetRelid(parentIdx));
22090 237 : if (OidIsValid(existingIdx))
22091 4 : ereport(ERROR,
22092 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
22093 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
22094 : RelationGetRelationName(partIdx),
22095 : RelationGetRelationName(parentIdx)),
22096 : errdetail("Another index \"%s\" is already attached for partition \"%s\".",
22097 : get_rel_name(existingIdx),
22098 : RelationGetRelationName(partitionTbl))));
22099 233 : }
22100 :
22101 : /*
22102 : * Verify whether the set of attached partition indexes to a parent index on
22103 : * a partitioned table is complete. If it is, mark the parent index valid.
22104 : *
22105 : * This should be called each time a partition index is attached.
22106 : */
22107 : static void
22108 241 : validatePartitionedIndex(Relation partedIdx, Relation partedTbl)
22109 : {
22110 : Relation inheritsRel;
22111 : SysScanDesc scan;
22112 : ScanKeyData key;
22113 241 : int tuples = 0;
22114 : HeapTuple inhTup;
22115 241 : bool updated = false;
22116 :
22117 : Assert(partedIdx->rd_rel->relkind == RELKIND_PARTITIONED_INDEX);
22118 :
22119 : /*
22120 : * Scan pg_inherits for this parent index. Count each valid index we find
22121 : * (verifying the pg_index entry for each), and if we reach the total
22122 : * amount we expect, we can mark this parent index as valid.
22123 : */
22124 241 : inheritsRel = table_open(InheritsRelationId, AccessShareLock);
22125 241 : ScanKeyInit(&key, Anum_pg_inherits_inhparent,
22126 : BTEqualStrategyNumber, F_OIDEQ,
22127 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
22128 241 : scan = systable_beginscan(inheritsRel, InheritsParentIndexId, true,
22129 : NULL, 1, &key);
22130 611 : while ((inhTup = systable_getnext(scan)) != NULL)
22131 : {
22132 370 : Form_pg_inherits inhForm = (Form_pg_inherits) GETSTRUCT(inhTup);
22133 : HeapTuple indTup;
22134 : Form_pg_index indexForm;
22135 :
22136 370 : indTup = SearchSysCache1(INDEXRELID,
22137 : ObjectIdGetDatum(inhForm->inhrelid));
22138 370 : if (!HeapTupleIsValid(indTup))
22139 0 : elog(ERROR, "cache lookup failed for index %u", inhForm->inhrelid);
22140 370 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
22141 370 : if (indexForm->indisvalid)
22142 304 : tuples += 1;
22143 370 : ReleaseSysCache(indTup);
22144 : }
22145 :
22146 : /* Done with pg_inherits */
22147 241 : systable_endscan(scan);
22148 241 : table_close(inheritsRel, AccessShareLock);
22149 :
22150 : /*
22151 : * If we found as many inherited indexes as the partitioned table has
22152 : * partitions, we're good; update pg_index to set indisvalid.
22153 : */
22154 241 : if (tuples == RelationGetPartitionDesc(partedTbl, true)->nparts)
22155 : {
22156 : Relation idxRel;
22157 : HeapTuple indTup;
22158 : Form_pg_index indexForm;
22159 :
22160 114 : idxRel = table_open(IndexRelationId, RowExclusiveLock);
22161 114 : indTup = SearchSysCacheCopy1(INDEXRELID,
22162 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
22163 114 : if (!HeapTupleIsValid(indTup))
22164 0 : elog(ERROR, "cache lookup failed for index %u",
22165 : RelationGetRelid(partedIdx));
22166 114 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
22167 :
22168 114 : indexForm->indisvalid = true;
22169 114 : updated = true;
22170 :
22171 114 : CatalogTupleUpdate(idxRel, &indTup->t_self, indTup);
22172 :
22173 114 : table_close(idxRel, RowExclusiveLock);
22174 114 : heap_freetuple(indTup);
22175 : }
22176 :
22177 : /*
22178 : * If this index is in turn a partition of a larger index, validating it
22179 : * might cause the parent to become valid also. Try that.
22180 : */
22181 241 : if (updated && partedIdx->rd_rel->relispartition)
22182 : {
22183 : Oid parentIdxId,
22184 : parentTblId;
22185 : Relation parentIdx,
22186 : parentTbl;
22187 :
22188 : /* make sure we see the validation we just did */
22189 32 : CommandCounterIncrement();
22190 :
22191 32 : parentIdxId = get_partition_parent(RelationGetRelid(partedIdx), false);
22192 32 : parentTblId = get_partition_parent(RelationGetRelid(partedTbl), false);
22193 32 : parentIdx = relation_open(parentIdxId, AccessExclusiveLock);
22194 32 : parentTbl = relation_open(parentTblId, AccessExclusiveLock);
22195 : Assert(!parentIdx->rd_index->indisvalid);
22196 :
22197 32 : validatePartitionedIndex(parentIdx, parentTbl);
22198 :
22199 32 : relation_close(parentIdx, AccessExclusiveLock);
22200 32 : relation_close(parentTbl, AccessExclusiveLock);
22201 : }
22202 241 : }
22203 :
22204 : /*
22205 : * When attaching an index as a partition of a partitioned index which is a
22206 : * primary key, verify that all the columns in the partition are marked NOT
22207 : * NULL.
22208 : */
22209 : static void
22210 55 : verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition)
22211 : {
22212 111 : for (int i = 0; i < iinfo->ii_NumIndexKeyAttrs; i++)
22213 : {
22214 56 : Form_pg_attribute att = TupleDescAttr(RelationGetDescr(partition),
22215 56 : iinfo->ii_IndexAttrNumbers[i] - 1);
22216 :
22217 56 : if (!att->attnotnull)
22218 0 : ereport(ERROR,
22219 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
22220 : errmsg("invalid primary key definition"),
22221 : errdetail("Column \"%s\" of relation \"%s\" is not marked NOT NULL.",
22222 : NameStr(att->attname),
22223 : RelationGetRelationName(partition)));
22224 : }
22225 55 : }
22226 :
22227 : /*
22228 : * Return an OID list of constraints that reference the given relation
22229 : * that are marked as having a parent constraints.
22230 : */
22231 : static List *
22232 1021 : GetParentedForeignKeyRefs(Relation partition)
22233 : {
22234 : Relation pg_constraint;
22235 : HeapTuple tuple;
22236 : SysScanDesc scan;
22237 : ScanKeyData key[2];
22238 1021 : List *constraints = NIL;
22239 :
22240 : /*
22241 : * If no indexes, or no columns are referenceable by FKs, we can avoid the
22242 : * scan.
22243 : */
22244 1453 : if (RelationGetIndexList(partition) == NIL ||
22245 432 : bms_is_empty(RelationGetIndexAttrBitmap(partition,
22246 : INDEX_ATTR_BITMAP_KEY)))
22247 762 : return NIL;
22248 :
22249 : /* Search for constraints referencing this table */
22250 259 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
22251 259 : ScanKeyInit(&key[0],
22252 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
22253 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(partition)));
22254 259 : ScanKeyInit(&key[1],
22255 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
22256 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
22257 :
22258 : /* XXX This is a seqscan, as we don't have a usable index */
22259 259 : scan = systable_beginscan(pg_constraint, InvalidOid, true, NULL, 2, key);
22260 380 : while ((tuple = systable_getnext(scan)) != NULL)
22261 : {
22262 121 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
22263 :
22264 : /*
22265 : * We only need to process constraints that are part of larger ones.
22266 : */
22267 121 : if (!OidIsValid(constrForm->conparentid))
22268 0 : continue;
22269 :
22270 121 : constraints = lappend_oid(constraints, constrForm->oid);
22271 : }
22272 :
22273 259 : systable_endscan(scan);
22274 259 : table_close(pg_constraint, AccessShareLock);
22275 :
22276 259 : return constraints;
22277 : }
22278 :
22279 : /*
22280 : * During DETACH PARTITION, verify that any foreign keys pointing to the
22281 : * partitioned table would not become invalid. An error is raised if any
22282 : * referenced values exist.
22283 : */
22284 : static void
22285 344 : ATDetachCheckNoForeignKeyRefs(Relation partition)
22286 : {
22287 : List *constraints;
22288 : ListCell *cell;
22289 :
22290 344 : constraints = GetParentedForeignKeyRefs(partition);
22291 :
22292 387 : foreach(cell, constraints)
22293 : {
22294 65 : Oid constrOid = lfirst_oid(cell);
22295 : HeapTuple tuple;
22296 : Form_pg_constraint constrForm;
22297 : Relation rel;
22298 65 : Trigger trig = {0};
22299 :
22300 65 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
22301 65 : if (!HeapTupleIsValid(tuple))
22302 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
22303 65 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
22304 :
22305 : Assert(OidIsValid(constrForm->conparentid));
22306 : Assert(constrForm->confrelid == RelationGetRelid(partition));
22307 :
22308 : /* prevent data changes into the referencing table until commit */
22309 65 : rel = table_open(constrForm->conrelid, ShareLock);
22310 :
22311 65 : trig.tgoid = InvalidOid;
22312 65 : trig.tgname = NameStr(constrForm->conname);
22313 65 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
22314 65 : trig.tgisinternal = true;
22315 65 : trig.tgconstrrelid = RelationGetRelid(partition);
22316 65 : trig.tgconstrindid = constrForm->conindid;
22317 65 : trig.tgconstraint = constrForm->oid;
22318 65 : trig.tgdeferrable = false;
22319 65 : trig.tginitdeferred = false;
22320 : /* we needn't fill in remaining fields */
22321 :
22322 65 : RI_PartitionRemove_Check(&trig, rel, partition);
22323 :
22324 43 : ReleaseSysCache(tuple);
22325 :
22326 43 : table_close(rel, NoLock);
22327 : }
22328 322 : }
22329 :
22330 : /*
22331 : * resolve column compression specification to compression method.
22332 : */
22333 : static char
22334 169951 : GetAttributeCompression(Oid atttypid, const char *compression)
22335 : {
22336 : char cmethod;
22337 :
22338 169951 : if (compression == NULL || strcmp(compression, "default") == 0)
22339 169812 : return InvalidCompressionMethod;
22340 :
22341 : /*
22342 : * To specify a nondefault method, the column data type must be toastable.
22343 : * Note this says nothing about whether the column's attstorage setting
22344 : * permits compression; we intentionally allow attstorage and
22345 : * attcompression to be independent. But with a non-toastable type,
22346 : * attstorage could not be set to a value that would permit compression.
22347 : *
22348 : * We don't actually need to enforce this, since nothing bad would happen
22349 : * if attcompression were non-default; it would never be consulted. But
22350 : * it seems more user-friendly to complain about a certainly-useless
22351 : * attempt to set the property.
22352 : */
22353 139 : if (!TypeIsToastable(atttypid))
22354 4 : ereport(ERROR,
22355 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
22356 : errmsg("column data type %s does not support compression",
22357 : format_type_be(atttypid))));
22358 :
22359 135 : cmethod = CompressionNameToMethod(compression);
22360 135 : if (!CompressionMethodIsValid(cmethod))
22361 8 : ereport(ERROR,
22362 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
22363 : errmsg("invalid compression method \"%s\"", compression)));
22364 :
22365 127 : return cmethod;
22366 : }
22367 :
22368 : /*
22369 : * resolve column storage specification
22370 : */
22371 : static char
22372 204 : GetAttributeStorage(Oid atttypid, const char *storagemode)
22373 : {
22374 204 : char cstorage = 0;
22375 :
22376 204 : if (pg_strcasecmp(storagemode, "plain") == 0)
22377 37 : cstorage = TYPSTORAGE_PLAIN;
22378 167 : else if (pg_strcasecmp(storagemode, "external") == 0)
22379 104 : cstorage = TYPSTORAGE_EXTERNAL;
22380 63 : else if (pg_strcasecmp(storagemode, "extended") == 0)
22381 26 : cstorage = TYPSTORAGE_EXTENDED;
22382 37 : else if (pg_strcasecmp(storagemode, "main") == 0)
22383 33 : cstorage = TYPSTORAGE_MAIN;
22384 4 : else if (pg_strcasecmp(storagemode, "default") == 0)
22385 4 : cstorage = get_typstorage(atttypid);
22386 : else
22387 0 : ereport(ERROR,
22388 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
22389 : errmsg("invalid storage type \"%s\"",
22390 : storagemode)));
22391 :
22392 : /*
22393 : * safety check: do not allow toasted storage modes unless column datatype
22394 : * is TOAST-aware.
22395 : */
22396 204 : if (!(cstorage == TYPSTORAGE_PLAIN || TypeIsToastable(atttypid)))
22397 4 : ereport(ERROR,
22398 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
22399 : errmsg("column data type %s can only have storage PLAIN",
22400 : format_type_be(atttypid))));
22401 :
22402 200 : return cstorage;
22403 : }
22404 :
22405 : /*
22406 : * buildExpressionExecutionStates: build the needed expression execution states
22407 : * for new partition (newPartRel) checks and initialize expressions for
22408 : * generated columns. All expressions should be created in "tab"
22409 : * (AlteredTableInfo structure).
22410 : */
22411 : static void
22412 424 : buildExpressionExecutionStates(AlteredTableInfo *tab, Relation newPartRel, EState *estate)
22413 : {
22414 : /*
22415 : * Build the needed expression execution states. Here, we expect only NOT
22416 : * NULL and CHECK constraint.
22417 : */
22418 864 : foreach_ptr(NewConstraint, con, tab->constraints)
22419 : {
22420 16 : switch (con->contype)
22421 : {
22422 16 : case CONSTR_CHECK:
22423 :
22424 : /*
22425 : * We already expanded virtual expression in
22426 : * createTableConstraints.
22427 : */
22428 16 : con->qualstate = ExecPrepareExpr((Expr *) con->qual, estate);
22429 16 : break;
22430 0 : case CONSTR_NOTNULL:
22431 : /* Nothing to do here. */
22432 0 : break;
22433 0 : default:
22434 0 : elog(ERROR, "unrecognized constraint type: %d",
22435 : (int) con->contype);
22436 : }
22437 : }
22438 :
22439 : /* Expression already planned in createTableConstraints */
22440 892 : foreach_ptr(NewColumnValue, ex, tab->newvals)
22441 44 : ex->exprstate = ExecInitExpr((Expr *) ex->expr, NULL);
22442 424 : }
22443 :
22444 : /*
22445 : * evaluateGeneratedExpressionsAndCheckConstraints: evaluate any generated
22446 : * expressions for "tab" (AlteredTableInfo structure) whose inputs come from
22447 : * the new tuple (insertslot) of the new partition (newPartRel).
22448 : */
22449 : static void
22450 664 : evaluateGeneratedExpressionsAndCheckConstraints(AlteredTableInfo *tab,
22451 : Relation newPartRel,
22452 : TupleTableSlot *insertslot,
22453 : ExprContext *econtext)
22454 : {
22455 664 : econtext->ecxt_scantuple = insertslot;
22456 :
22457 1392 : foreach_ptr(NewColumnValue, ex, tab->newvals)
22458 : {
22459 64 : if (!ex->is_generated)
22460 0 : continue;
22461 :
22462 64 : insertslot->tts_values[ex->attnum - 1]
22463 64 : = ExecEvalExpr(ex->exprstate,
22464 : econtext,
22465 64 : &insertslot->tts_isnull[ex->attnum - 1]);
22466 : }
22467 :
22468 1352 : foreach_ptr(NewConstraint, con, tab->constraints)
22469 : {
22470 24 : switch (con->contype)
22471 : {
22472 24 : case CONSTR_CHECK:
22473 24 : if (!ExecCheck(con->qualstate, econtext))
22474 0 : ereport(ERROR,
22475 : errcode(ERRCODE_CHECK_VIOLATION),
22476 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
22477 : con->name, RelationGetRelationName(newPartRel)),
22478 : errtableconstraint(newPartRel, con->name));
22479 24 : break;
22480 0 : case CONSTR_NOTNULL:
22481 : case CONSTR_FOREIGN:
22482 : /* Nothing to do here */
22483 0 : break;
22484 0 : default:
22485 0 : elog(ERROR, "unrecognized constraint type: %d",
22486 : (int) con->contype);
22487 : }
22488 : }
22489 664 : }
22490 :
22491 : /*
22492 : * getAttributesList: build a list of columns (ColumnDef) based on parent_rel
22493 : */
22494 : static List *
22495 444 : getAttributesList(Relation parent_rel)
22496 : {
22497 : AttrNumber parent_attno;
22498 : TupleDesc modelDesc;
22499 444 : List *colList = NIL;
22500 :
22501 444 : modelDesc = RelationGetDescr(parent_rel);
22502 :
22503 1593 : for (parent_attno = 1; parent_attno <= modelDesc->natts;
22504 1149 : parent_attno++)
22505 : {
22506 1149 : Form_pg_attribute attribute = TupleDescAttr(modelDesc,
22507 : parent_attno - 1);
22508 : ColumnDef *def;
22509 :
22510 : /* Ignore dropped columns in the parent. */
22511 1149 : if (attribute->attisdropped)
22512 0 : continue;
22513 :
22514 1149 : def = makeColumnDef(NameStr(attribute->attname), attribute->atttypid,
22515 : attribute->atttypmod, attribute->attcollation);
22516 :
22517 1149 : def->is_not_null = attribute->attnotnull;
22518 :
22519 : /* Copy identity. */
22520 1149 : def->identity = attribute->attidentity;
22521 :
22522 : /* Copy attgenerated. */
22523 1149 : def->generated = attribute->attgenerated;
22524 :
22525 1149 : def->storage = attribute->attstorage;
22526 :
22527 : /* Likewise, copy compression. */
22528 1149 : if (CompressionMethodIsValid(attribute->attcompression))
22529 12 : def->compression =
22530 12 : pstrdup(GetCompressionMethodName(attribute->attcompression));
22531 : else
22532 1137 : def->compression = NULL;
22533 :
22534 : /* Add to column list. */
22535 1149 : colList = lappend(colList, def);
22536 : }
22537 :
22538 444 : return colList;
22539 : }
22540 :
22541 : /*
22542 : * createTableConstraints:
22543 : * create check constraints, default values, and generated values for newRel
22544 : * based on parent_rel. tab is pending-work queue for newRel, we may need it in
22545 : * MergePartitionsMoveRows.
22546 : */
22547 : static void
22548 424 : createTableConstraints(List **wqueue, AlteredTableInfo *tab,
22549 : Relation parent_rel, Relation newRel)
22550 : {
22551 : TupleDesc tupleDesc;
22552 : TupleConstr *constr;
22553 : AttrMap *attmap;
22554 : AttrNumber parent_attno;
22555 : int ccnum;
22556 424 : List *constraints = NIL;
22557 424 : List *cookedConstraints = NIL;
22558 :
22559 424 : tupleDesc = RelationGetDescr(parent_rel);
22560 424 : constr = tupleDesc->constr;
22561 :
22562 424 : if (!constr)
22563 268 : return;
22564 :
22565 : /*
22566 : * Construct a map from the parent relation's attnos to the child rel's.
22567 : * This re-checks type match, etc, although it shouldn't be possible to
22568 : * have a failure since both tables are locked.
22569 : */
22570 156 : attmap = build_attrmap_by_name(RelationGetDescr(newRel),
22571 : tupleDesc,
22572 : false);
22573 :
22574 : /* Cycle for default values. */
22575 592 : for (parent_attno = 1; parent_attno <= tupleDesc->natts; parent_attno++)
22576 : {
22577 436 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
22578 : parent_attno - 1);
22579 :
22580 : /* Ignore dropped columns in the parent. */
22581 436 : if (attribute->attisdropped)
22582 0 : continue;
22583 :
22584 : /* Copy the default, if present, and it should be copied. */
22585 436 : if (attribute->atthasdef)
22586 : {
22587 100 : Node *this_default = NULL;
22588 : bool found_whole_row;
22589 : AttrNumber num;
22590 : Node *def;
22591 : NewColumnValue *newval;
22592 :
22593 100 : if (attribute->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
22594 4 : this_default = build_generation_expression(parent_rel, attribute->attnum);
22595 : else
22596 : {
22597 96 : this_default = TupleDescGetDefault(tupleDesc, attribute->attnum);
22598 96 : if (this_default == NULL)
22599 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
22600 : attribute->attnum, RelationGetRelationName(parent_rel));
22601 : }
22602 :
22603 100 : num = attmap->attnums[parent_attno - 1];
22604 100 : def = map_variable_attnos(this_default, 1, 0, attmap, InvalidOid, &found_whole_row);
22605 :
22606 100 : if (found_whole_row && attribute->attgenerated != '\0')
22607 0 : elog(ERROR, "cannot convert whole-row table reference");
22608 :
22609 : /* Add a pre-cooked default expression. */
22610 100 : StoreAttrDefault(newRel, num, def, true);
22611 :
22612 : /*
22613 : * Stored generated column expressions in parent_rel might
22614 : * reference the tableoid. newRel, parent_rel tableoid clear is
22615 : * not the same. If so, these stored generated columns require
22616 : * recomputation for newRel within MergePartitionsMoveRows.
22617 : */
22618 100 : if (attribute->attgenerated == ATTRIBUTE_GENERATED_STORED)
22619 : {
22620 44 : newval = palloc0_object(NewColumnValue);
22621 44 : newval->attnum = num;
22622 44 : newval->expr = expression_planner((Expr *) def);
22623 44 : newval->is_generated = (attribute->attgenerated != '\0');
22624 44 : tab->newvals = lappend(tab->newvals, newval);
22625 : }
22626 : }
22627 : }
22628 :
22629 : /* Cycle for CHECK constraints. */
22630 224 : for (ccnum = 0; ccnum < constr->num_check; ccnum++)
22631 : {
22632 68 : char *ccname = constr->check[ccnum].ccname;
22633 68 : char *ccbin = constr->check[ccnum].ccbin;
22634 68 : bool ccenforced = constr->check[ccnum].ccenforced;
22635 68 : bool ccnoinherit = constr->check[ccnum].ccnoinherit;
22636 68 : bool ccvalid = constr->check[ccnum].ccvalid;
22637 : Node *ccbin_node;
22638 : bool found_whole_row;
22639 : Constraint *con;
22640 :
22641 : /*
22642 : * The partitioned table can not have a NO INHERIT check constraint
22643 : * (see StoreRelCheck function for details).
22644 : */
22645 : Assert(!ccnoinherit);
22646 :
22647 68 : ccbin_node = map_variable_attnos(stringToNode(ccbin),
22648 : 1, 0,
22649 : attmap,
22650 : InvalidOid, &found_whole_row);
22651 :
22652 : /*
22653 : * For the moment we have to reject whole-row variables (as for CREATE
22654 : * TABLE LIKE and inheritances).
22655 : */
22656 68 : if (found_whole_row)
22657 0 : elog(ERROR, "Constraint \"%s\" contains a whole-row reference to table \"%s\".",
22658 : ccname,
22659 : RelationGetRelationName(parent_rel));
22660 :
22661 68 : con = makeNode(Constraint);
22662 68 : con->contype = CONSTR_CHECK;
22663 68 : con->conname = pstrdup(ccname);
22664 68 : con->deferrable = false;
22665 68 : con->initdeferred = false;
22666 68 : con->is_enforced = ccenforced;
22667 68 : con->skip_validation = !ccvalid;
22668 68 : con->initially_valid = ccvalid;
22669 68 : con->is_no_inherit = ccnoinherit;
22670 68 : con->raw_expr = NULL;
22671 68 : con->cooked_expr = nodeToString(ccbin_node);
22672 68 : con->location = -1;
22673 68 : constraints = lappend(constraints, con);
22674 : }
22675 :
22676 : /* Install all CHECK constraints. */
22677 156 : cookedConstraints = AddRelationNewConstraints(newRel, NIL, constraints,
22678 : false, true, true, NULL);
22679 :
22680 : /* Make the additional catalog changes visible. */
22681 156 : CommandCounterIncrement();
22682 :
22683 : /*
22684 : * parent_rel check constraint expression may reference tableoid, so later
22685 : * in MergePartitionsMoveRows, we need to evaluate the check constraint
22686 : * again for the newRel. We can check whether the check constraint
22687 : * contains a tableoid reference via pull_varattnos.
22688 : */
22689 380 : foreach_ptr(CookedConstraint, ccon, cookedConstraints)
22690 : {
22691 68 : if (!ccon->skip_validation)
22692 : {
22693 : Node *qual;
22694 44 : Bitmapset *attnums = NULL;
22695 :
22696 : Assert(ccon->contype == CONSTR_CHECK);
22697 44 : qual = expand_generated_columns_in_expr(ccon->expr, newRel, 1);
22698 44 : pull_varattnos(qual, 1, &attnums);
22699 :
22700 : /*
22701 : * Add a check only if it contains a tableoid
22702 : * (TableOidAttributeNumber).
22703 : */
22704 44 : if (bms_is_member(TableOidAttributeNumber - FirstLowInvalidHeapAttributeNumber,
22705 : attnums))
22706 : {
22707 : NewConstraint *newcon;
22708 :
22709 16 : newcon = palloc0_object(NewConstraint);
22710 16 : newcon->name = ccon->name;
22711 16 : newcon->contype = CONSTR_CHECK;
22712 16 : newcon->qual = qual;
22713 :
22714 16 : tab->constraints = lappend(tab->constraints, newcon);
22715 : }
22716 : }
22717 : }
22718 :
22719 : /* Don't need the cookedConstraints anymore. */
22720 156 : list_free_deep(cookedConstraints);
22721 :
22722 : /* Reproduce not-null constraints. */
22723 156 : if (constr->has_not_null)
22724 : {
22725 : List *nnconstraints;
22726 :
22727 : /*
22728 : * The "include_noinh" argument is false because a partitioned table
22729 : * can't have NO INHERIT constraint.
22730 : */
22731 108 : nnconstraints = RelationGetNotNullConstraints(RelationGetRelid(parent_rel),
22732 : false, false);
22733 :
22734 : Assert(list_length(nnconstraints) > 0);
22735 :
22736 : /*
22737 : * We already set pg_attribute.attnotnull in createPartitionTable. No
22738 : * need call set_attnotnull again.
22739 : */
22740 108 : AddRelationNewConstraints(newRel, NIL, nnconstraints, false, true, true, NULL);
22741 : }
22742 : }
22743 :
22744 : /*
22745 : * createPartitionTable:
22746 : *
22747 : * Create a new partition (newPartName) for the partitioned table (parent_rel).
22748 : * ownerId is determined by the partition on which the operation is performed,
22749 : * so it is passed separately. The new partition will inherit the access method
22750 : * and persistence type from the parent table.
22751 : *
22752 : * Returns the created relation (locked in AccessExclusiveLock mode).
22753 : */
22754 : static Relation
22755 444 : createPartitionTable(List **wqueue, RangeVar *newPartName,
22756 : Relation parent_rel, Oid ownerId)
22757 : {
22758 : Relation newRel;
22759 : Oid newRelId;
22760 : Oid existingRelid;
22761 : TupleDesc descriptor;
22762 444 : List *colList = NIL;
22763 : Oid relamId;
22764 : Oid namespaceId;
22765 : AlteredTableInfo *new_partrel_tab;
22766 444 : Form_pg_class parent_relform = parent_rel->rd_rel;
22767 :
22768 : /* If the existing rel is temp, it must belong to this session. */
22769 444 : if (RELATION_IS_OTHER_TEMP(parent_rel))
22770 0 : ereport(ERROR,
22771 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22772 : errmsg("cannot create as partition of temporary relation of another session"));
22773 :
22774 : /* Look up inheritance ancestors and generate the relation schema. */
22775 444 : colList = getAttributesList(parent_rel);
22776 :
22777 : /* Create a tuple descriptor from the relation schema. */
22778 444 : descriptor = BuildDescForRelation(colList);
22779 :
22780 : /* Look up the access method for the new relation. */
22781 444 : relamId = (parent_relform->relam != InvalidOid) ? parent_relform->relam : HEAP_TABLE_AM_OID;
22782 :
22783 : /* Look up the namespace in which we are supposed to create the relation. */
22784 : namespaceId =
22785 444 : RangeVarGetAndCheckCreationNamespace(newPartName, NoLock, &existingRelid);
22786 444 : if (OidIsValid(existingRelid))
22787 0 : ereport(ERROR,
22788 : errcode(ERRCODE_DUPLICATE_TABLE),
22789 : errmsg("relation \"%s\" already exists", newPartName->relname));
22790 :
22791 : /*
22792 : * We intended to create the partition with the same persistence as the
22793 : * parent table, but we still need to recheck because that might be
22794 : * affected by the search_path. If the parent is permanent, so must be
22795 : * all of its partitions.
22796 : */
22797 444 : if (parent_relform->relpersistence != RELPERSISTENCE_TEMP &&
22798 408 : newPartName->relpersistence == RELPERSISTENCE_TEMP)
22799 8 : ereport(ERROR,
22800 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22801 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
22802 : RelationGetRelationName(parent_rel)));
22803 :
22804 : /* Permanent rels cannot be partitions belonging to a temporary parent. */
22805 436 : if (newPartName->relpersistence != RELPERSISTENCE_TEMP &&
22806 412 : parent_relform->relpersistence == RELPERSISTENCE_TEMP)
22807 12 : ereport(ERROR,
22808 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22809 : errmsg("cannot create a permanent relation as partition of temporary relation \"%s\"",
22810 : RelationGetRelationName(parent_rel)));
22811 :
22812 : /* Create the relation. */
22813 424 : newRelId = heap_create_with_catalog(newPartName->relname,
22814 : namespaceId,
22815 : parent_relform->reltablespace,
22816 : InvalidOid,
22817 : InvalidOid,
22818 : InvalidOid,
22819 : ownerId,
22820 : relamId,
22821 : descriptor,
22822 : NIL,
22823 : RELKIND_RELATION,
22824 424 : newPartName->relpersistence,
22825 : false,
22826 : false,
22827 : ONCOMMIT_NOOP,
22828 : (Datum) 0,
22829 : true,
22830 : allowSystemTableMods,
22831 : true,
22832 : InvalidOid,
22833 : NULL);
22834 :
22835 : /*
22836 : * We must bump the command counter to make the newly-created relation
22837 : * tuple visible for opening.
22838 : */
22839 424 : CommandCounterIncrement();
22840 :
22841 : /*
22842 : * Open the new partition with no lock, because we already have an
22843 : * AccessExclusiveLock placed there after creation.
22844 : */
22845 424 : newRel = table_open(newRelId, NoLock);
22846 :
22847 : /* Find or create a work queue entry for the newly created table. */
22848 424 : new_partrel_tab = ATGetQueueEntry(wqueue, newRel);
22849 :
22850 : /* Create constraints, default values, and generated values. */
22851 424 : createTableConstraints(wqueue, new_partrel_tab, parent_rel, newRel);
22852 :
22853 : /*
22854 : * Need to call CommandCounterIncrement, so a fresh relcache entry has
22855 : * newly installed constraint info.
22856 : */
22857 424 : CommandCounterIncrement();
22858 :
22859 424 : return newRel;
22860 : }
22861 :
22862 : /*
22863 : * MergePartitionsMoveRows: scan partitions to be merged (mergingPartitions)
22864 : * of the partitioned table and move rows into the new partition
22865 : * (newPartRel). We also verify check constraints against these rows.
22866 : */
22867 : static void
22868 90 : MergePartitionsMoveRows(List **wqueue, List *mergingPartitions, Relation newPartRel)
22869 : {
22870 : CommandId mycid;
22871 : EState *estate;
22872 : AlteredTableInfo *tab;
22873 : ListCell *ltab;
22874 :
22875 : /* The FSM is empty, so don't bother using it. */
22876 90 : uint32 ti_options = TABLE_INSERT_SKIP_FSM;
22877 : BulkInsertState bistate; /* state of bulk inserts for partition */
22878 : TupleTableSlot *dstslot;
22879 :
22880 : /* Find the work queue entry for the new partition table: newPartRel. */
22881 90 : tab = ATGetQueueEntry(wqueue, newPartRel);
22882 :
22883 : /* Generate the constraint and default execution states. */
22884 90 : estate = CreateExecutorState();
22885 :
22886 90 : buildExpressionExecutionStates(tab, newPartRel, estate);
22887 :
22888 90 : mycid = GetCurrentCommandId(true);
22889 :
22890 : /* Prepare a BulkInsertState for table_tuple_insert. */
22891 90 : bistate = GetBulkInsertState();
22892 :
22893 : /* Create the necessary tuple slot. */
22894 90 : dstslot = table_slot_create(newPartRel, NULL);
22895 :
22896 388 : foreach_oid(merging_oid, mergingPartitions)
22897 : {
22898 : ExprContext *econtext;
22899 : TupleTableSlot *srcslot;
22900 : TupleConversionMap *tuple_map;
22901 : TableScanDesc scan;
22902 : MemoryContext oldCxt;
22903 : Snapshot snapshot;
22904 : Relation mergingPartition;
22905 :
22906 208 : econtext = GetPerTupleExprContext(estate);
22907 :
22908 : /*
22909 : * Partition is already locked in the transformPartitionCmdForMerge
22910 : * function.
22911 : */
22912 208 : mergingPartition = table_open(merging_oid, NoLock);
22913 :
22914 : /* Create a source tuple slot for the partition being merged. */
22915 208 : srcslot = table_slot_create(mergingPartition, NULL);
22916 :
22917 : /*
22918 : * Map computing for moving attributes of the merged partition to the
22919 : * new partition.
22920 : */
22921 208 : tuple_map = convert_tuples_by_name(RelationGetDescr(mergingPartition),
22922 : RelationGetDescr(newPartRel));
22923 :
22924 : /* Scan through the rows. */
22925 208 : snapshot = RegisterSnapshot(GetLatestSnapshot());
22926 208 : scan = table_beginscan(mergingPartition, snapshot, 0, NULL,
22927 : SO_NONE);
22928 :
22929 : /*
22930 : * Switch to per-tuple memory context and reset it for each tuple
22931 : * produced, so we don't leak memory.
22932 : */
22933 208 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
22934 :
22935 449 : while (table_scan_getnextslot(scan, ForwardScanDirection, srcslot))
22936 : {
22937 : TupleTableSlot *insertslot;
22938 :
22939 241 : CHECK_FOR_INTERRUPTS();
22940 :
22941 241 : if (tuple_map)
22942 : {
22943 : /* Need to use a map to copy attributes. */
22944 28 : insertslot = execute_attr_map_slot(tuple_map->attrMap, srcslot, dstslot);
22945 : }
22946 : else
22947 : {
22948 213 : slot_getallattrs(srcslot);
22949 :
22950 : /* Copy attributes directly. */
22951 213 : insertslot = dstslot;
22952 :
22953 213 : ExecClearTuple(insertslot);
22954 :
22955 213 : memcpy(insertslot->tts_values, srcslot->tts_values,
22956 213 : sizeof(Datum) * srcslot->tts_nvalid);
22957 213 : memcpy(insertslot->tts_isnull, srcslot->tts_isnull,
22958 213 : sizeof(bool) * srcslot->tts_nvalid);
22959 :
22960 213 : ExecStoreVirtualTuple(insertslot);
22961 : }
22962 :
22963 : /*
22964 : * Constraints and GENERATED expressions might reference the
22965 : * tableoid column, so fill tts_tableOid with the desired value.
22966 : * (We must do this each time, because it gets overwritten with
22967 : * newrel's OID during storing.)
22968 : */
22969 241 : insertslot->tts_tableOid = RelationGetRelid(newPartRel);
22970 :
22971 : /*
22972 : * Now, evaluate any generated expressions whose inputs come from
22973 : * the new tuple. We assume these columns won't reference each
22974 : * other, so that there's no ordering dependency.
22975 : */
22976 241 : evaluateGeneratedExpressionsAndCheckConstraints(tab, newPartRel,
22977 : insertslot, econtext);
22978 :
22979 : /* Write the tuple out to the new relation. */
22980 241 : table_tuple_insert(newPartRel, insertslot, mycid,
22981 : ti_options, bistate);
22982 :
22983 241 : ResetExprContext(econtext);
22984 : }
22985 :
22986 208 : MemoryContextSwitchTo(oldCxt);
22987 208 : table_endscan(scan);
22988 208 : UnregisterSnapshot(snapshot);
22989 :
22990 208 : if (tuple_map)
22991 20 : free_conversion_map(tuple_map);
22992 :
22993 208 : ExecDropSingleTupleTableSlot(srcslot);
22994 208 : table_close(mergingPartition, NoLock);
22995 : }
22996 :
22997 90 : FreeExecutorState(estate);
22998 90 : ExecDropSingleTupleTableSlot(dstslot);
22999 90 : FreeBulkInsertState(bistate);
23000 :
23001 90 : table_finish_bulk_insert(newPartRel, ti_options);
23002 :
23003 : /*
23004 : * We don't need to process this newPartRel since we already processed it
23005 : * here, so delete the ALTER TABLE queue for it.
23006 : */
23007 180 : foreach(ltab, *wqueue)
23008 : {
23009 180 : tab = (AlteredTableInfo *) lfirst(ltab);
23010 180 : if (tab->relid == RelationGetRelid(newPartRel))
23011 : {
23012 90 : *wqueue = list_delete_cell(*wqueue, ltab);
23013 90 : break;
23014 : }
23015 : }
23016 90 : }
23017 :
23018 : /*
23019 : * detachPartitionTable: detach partition "child_rel" from partitioned table
23020 : * "parent_rel" with default partition identifier "defaultPartOid"
23021 : */
23022 : static void
23023 373 : detachPartitionTable(Relation parent_rel, Relation child_rel, Oid defaultPartOid)
23024 : {
23025 : /* Remove the pg_inherits row first. */
23026 373 : RemoveInheritance(child_rel, parent_rel, false);
23027 :
23028 : /*
23029 : * Detaching the partition might involve TOAST table access, so ensure we
23030 : * have a valid snapshot.
23031 : */
23032 373 : PushActiveSnapshot(GetTransactionSnapshot());
23033 :
23034 : /* Do the final part of detaching. */
23035 373 : DetachPartitionFinalize(parent_rel, child_rel, false, defaultPartOid);
23036 :
23037 373 : PopActiveSnapshot();
23038 373 : }
23039 :
23040 : /*
23041 : * equal_oid_lists: return true if two OID lists, each sorted in ascending
23042 : * order, contain the same OIDs in the same order.
23043 : */
23044 : static bool
23045 86 : equal_oid_lists(const List *a, const List *b)
23046 : {
23047 : ListCell *la,
23048 : *lb;
23049 :
23050 86 : if (list_length(a) != list_length(b))
23051 4 : return false;
23052 :
23053 86 : forboth(la, a, lb, b)
23054 : {
23055 6 : if (lfirst_oid(la) != lfirst_oid(lb))
23056 2 : return false;
23057 : }
23058 80 : return true;
23059 : }
23060 :
23061 : /*
23062 : * Comparator for list_sort() on a list of PartitionIndexExtDepEntry *.
23063 : * Orders by parentIndexOid, then by indexOid as a tiebreaker so conflict
23064 : * reports for different parent indexes are deterministic.
23065 : */
23066 : static int
23067 145 : cmp_partition_index_ext_dep(const ListCell *a, const ListCell *b)
23068 : {
23069 145 : const PartitionIndexExtDepEntry *ea = lfirst(a);
23070 145 : const PartitionIndexExtDepEntry *eb = lfirst(b);
23071 :
23072 145 : if (ea->parentIndexOid != eb->parentIndexOid)
23073 53 : return pg_cmp_u32(ea->parentIndexOid, eb->parentIndexOid);
23074 92 : return pg_cmp_u32(ea->indexOid, eb->indexOid);
23075 : }
23076 :
23077 : /*
23078 : * collectPartitionIndexExtDeps: collect extension dependencies from indexes
23079 : * on the given partitions.
23080 : *
23081 : * For each partition index that has a parent partitioned index, we collect
23082 : * extension dependencies. All source partition indexes sharing the same
23083 : * parent partitioned index must depend on exactly the same set of
23084 : * extensions; otherwise an error is raised so that we neither silently drop
23085 : * nor silently add dependencies on the merged partition's index.
23086 : *
23087 : * Indexes that don't have a parent partitioned index (i.e., indexes created
23088 : * directly on a partition without a corresponding parent index) are skipped.
23089 : *
23090 : * The returned list is sorted by parentIndexOid with exactly one entry per
23091 : * parent partitioned index, so applyPartitionIndexExtDeps() can scan it
23092 : * linearly.
23093 : */
23094 : static List *
23095 241 : collectPartitionIndexExtDeps(List *partitionOids)
23096 : {
23097 241 : List *collected = NIL;
23098 241 : List *result = NIL;
23099 241 : PartitionIndexExtDepEntry *prev = NULL;
23100 :
23101 : /*
23102 : * Phase 1: collect one entry per (partition index -> parent index) pair,
23103 : * with its extension dependency OIDs sorted ascending.
23104 : */
23105 867 : foreach_oid(partOid, partitionOids)
23106 : {
23107 : Relation partRel;
23108 : List *indexList;
23109 :
23110 : /*
23111 : * Use NoLock since the caller already holds AccessExclusiveLock on
23112 : * these partitions.
23113 : */
23114 385 : partRel = table_open(partOid, NoLock);
23115 385 : indexList = RelationGetIndexList(partRel);
23116 :
23117 969 : foreach_oid(indexOid, indexList)
23118 : {
23119 : Oid parentIndexOid;
23120 : PartitionIndexExtDepEntry *entry;
23121 :
23122 199 : if (!get_rel_relispartition(indexOid))
23123 1 : continue;
23124 :
23125 198 : parentIndexOid = get_partition_parent(indexOid, true);
23126 198 : if (!OidIsValid(parentIndexOid))
23127 0 : continue;
23128 :
23129 198 : entry = palloc(sizeof(PartitionIndexExtDepEntry));
23130 198 : entry->parentIndexOid = parentIndexOid;
23131 198 : entry->indexOid = indexOid;
23132 198 : entry->extensionOids = getAutoExtensionsOfObject(RelationRelationId,
23133 : indexOid);
23134 198 : list_sort(entry->extensionOids, list_oid_cmp);
23135 :
23136 198 : collected = lappend(collected, entry);
23137 : }
23138 :
23139 385 : list_free(indexList);
23140 385 : table_close(partRel, NoLock);
23141 : }
23142 :
23143 : /*
23144 : * Phase 2: sort by parentIndexOid so entries sharing a parent index sit
23145 : * adjacent.
23146 : */
23147 241 : list_sort(collected, cmp_partition_index_ext_dep);
23148 :
23149 : /*
23150 : * Phase 3: single linear pass verifying that adjacent entries sharing a
23151 : * parent index have identical extension dependencies, and keeping one
23152 : * representative entry per parent index.
23153 : */
23154 656 : foreach_ptr(PartitionIndexExtDepEntry, entry, collected)
23155 : {
23156 186 : if (prev != NULL && prev->parentIndexOid == entry->parentIndexOid)
23157 : {
23158 86 : if (!equal_oid_lists(prev->extensionOids, entry->extensionOids))
23159 6 : ereport(ERROR,
23160 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
23161 : errmsg("cannot merge partitions with conflicting extension dependencies"),
23162 : errdetail("Partition indexes \"%s\" and \"%s\" depend on different extensions.",
23163 : get_rel_name(prev->indexOid),
23164 : get_rel_name(entry->indexOid))));
23165 :
23166 : /* Duplicate entry for the same parent index; discard. */
23167 80 : list_free(entry->extensionOids);
23168 80 : pfree(entry);
23169 80 : continue;
23170 : }
23171 :
23172 100 : result = lappend(result, entry);
23173 100 : prev = entry;
23174 : }
23175 :
23176 235 : list_free(collected);
23177 :
23178 235 : return result;
23179 : }
23180 :
23181 : /*
23182 : * applyPartitionIndexExtDeps: apply collected extension dependencies to
23183 : * indexes on a new partition.
23184 : *
23185 : * For each index on the new partition, look up its parent index in the
23186 : * extDepState list. If found, record extension dependencies on the new index.
23187 : * extDepState is sorted by parentIndexOid, so the inner scan can bail out
23188 : * as soon as it passes the target OID.
23189 : */
23190 : static void
23191 424 : applyPartitionIndexExtDeps(Oid newPartOid, List *extDepState)
23192 : {
23193 : Relation partRel;
23194 : List *indexList;
23195 :
23196 424 : if (extDepState == NIL)
23197 276 : return;
23198 :
23199 : /*
23200 : * Use NoLock since the caller already holds AccessExclusiveLock on the
23201 : * new partition.
23202 : */
23203 148 : partRel = table_open(newPartOid, NoLock);
23204 148 : indexList = RelationGetIndexList(partRel);
23205 :
23206 468 : foreach_oid(indexOid, indexList)
23207 : {
23208 : Oid parentIdxOid;
23209 :
23210 172 : if (!get_rel_relispartition(indexOid))
23211 0 : continue;
23212 :
23213 172 : parentIdxOid = get_partition_parent(indexOid, true);
23214 172 : if (!OidIsValid(parentIdxOid))
23215 0 : continue;
23216 :
23217 368 : foreach_ptr(PartitionIndexExtDepEntry, entry, extDepState)
23218 : {
23219 : ObjectAddress indexAddr;
23220 :
23221 196 : if (entry->parentIndexOid > parentIdxOid)
23222 172 : break;
23223 196 : if (entry->parentIndexOid < parentIdxOid)
23224 24 : continue;
23225 :
23226 172 : ObjectAddressSet(indexAddr, RelationRelationId, indexOid);
23227 :
23228 352 : foreach_oid(extOid, entry->extensionOids)
23229 : {
23230 : ObjectAddress extAddr;
23231 :
23232 8 : ObjectAddressSet(extAddr, ExtensionRelationId, extOid);
23233 8 : recordDependencyOn(&indexAddr, &extAddr,
23234 : DEPENDENCY_AUTO_EXTENSION);
23235 : }
23236 172 : break;
23237 : }
23238 : }
23239 :
23240 148 : list_free(indexList);
23241 148 : table_close(partRel, NoLock);
23242 : }
23243 :
23244 : /*
23245 : * freePartitionIndexExtDeps: free memory allocated by collectPartitionIndexExtDeps.
23246 : */
23247 : static void
23248 211 : freePartitionIndexExtDeps(List *extDepState)
23249 : {
23250 516 : foreach_ptr(PartitionIndexExtDepEntry, entry, extDepState)
23251 : {
23252 94 : list_free(entry->extensionOids);
23253 94 : pfree(entry);
23254 : }
23255 211 : list_free(extDepState);
23256 211 : }
23257 :
23258 : /*
23259 : * ALTER TABLE <name> MERGE PARTITIONS <partition-list> INTO <partition-name>
23260 : */
23261 : static void
23262 124 : ATExecMergePartitions(List **wqueue, AlteredTableInfo *tab, Relation rel,
23263 : PartitionCmd *cmd, AlterTableUtilityContext *context)
23264 : {
23265 : Relation newPartRel;
23266 124 : List *mergingPartitions = NIL;
23267 124 : List *extDepState = NIL;
23268 : Oid defaultPartOid;
23269 : Oid existingRelid;
23270 124 : Oid ownerId = InvalidOid;
23271 : Oid save_userid;
23272 : int save_sec_context;
23273 : int save_nestlevel;
23274 :
23275 : /*
23276 : * Check ownership of merged partitions - partitions with different owners
23277 : * cannot be merged. Also, collect the OIDs of these partitions during the
23278 : * check.
23279 : */
23280 520 : foreach_node(RangeVar, name, cmd->partlist)
23281 : {
23282 : Relation mergingPartition;
23283 :
23284 : /*
23285 : * We are going to detach and remove this partition. We already took
23286 : * AccessExclusiveLock lock on transformPartitionCmdForMerge, so here,
23287 : * NoLock is fine.
23288 : */
23289 280 : mergingPartition = table_openrv_extended(name, NoLock, false);
23290 : Assert(CheckRelationLockedByMe(mergingPartition, AccessExclusiveLock, false));
23291 :
23292 280 : if (OidIsValid(ownerId))
23293 : {
23294 : /* Do the partitions being merged have different owners? */
23295 156 : if (ownerId != mergingPartition->rd_rel->relowner)
23296 4 : ereport(ERROR,
23297 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
23298 : errmsg("partitions being merged have different owners"));
23299 : }
23300 : else
23301 124 : ownerId = mergingPartition->rd_rel->relowner;
23302 :
23303 : /* Store the next merging partition into the list. */
23304 276 : mergingPartitions = lappend_oid(mergingPartitions,
23305 : RelationGetRelid(mergingPartition));
23306 :
23307 276 : table_close(mergingPartition, NoLock);
23308 : }
23309 :
23310 : /* Look up the existing relation by the new partition name. */
23311 120 : RangeVarGetAndCheckCreationNamespace(cmd->name, NoLock, &existingRelid);
23312 :
23313 : /*
23314 : * Check if this name is already taken. This helps us to detect the
23315 : * situation when one of the merging partitions has the same name as the
23316 : * new partition. Otherwise, this would fail later on anyway, but
23317 : * catching this here allows us to emit a nicer error message.
23318 : */
23319 120 : if (OidIsValid(existingRelid))
23320 : {
23321 17 : if (list_member_oid(mergingPartitions, existingRelid))
23322 : {
23323 : /*
23324 : * The new partition has the same name as one of the merging
23325 : * partitions.
23326 : */
23327 : char tmpRelName[NAMEDATALEN];
23328 :
23329 : /* Generate a temporary name. */
23330 13 : sprintf(tmpRelName, "merge-%u-%X-tmp", RelationGetRelid(rel), MyProcPid);
23331 :
23332 : /*
23333 : * Rename the existing partition with a temporary name, leaving it
23334 : * free for the new partition. We don't need to care about this
23335 : * in the future because we're going to eventually drop the
23336 : * existing partition anyway.
23337 : */
23338 13 : RenameRelationInternal(existingRelid, tmpRelName, true, false);
23339 :
23340 : /*
23341 : * We must bump the command counter to make the new partition
23342 : * tuple visible for rename.
23343 : */
23344 13 : CommandCounterIncrement();
23345 : }
23346 : else
23347 : {
23348 4 : ereport(ERROR,
23349 : errcode(ERRCODE_DUPLICATE_TABLE),
23350 : errmsg("relation \"%s\" already exists", cmd->name->relname));
23351 : }
23352 : }
23353 :
23354 : defaultPartOid =
23355 116 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
23356 :
23357 : /*
23358 : * Collect extension dependencies from indexes on the merging partitions.
23359 : * We must do this before detaching them, so we can restore the
23360 : * dependencies on the new partition's indexes later.
23361 : */
23362 116 : extDepState = collectPartitionIndexExtDeps(mergingPartitions);
23363 :
23364 : /* Detach all merging partitions. */
23365 468 : foreach_oid(mergingPartitionOid, mergingPartitions)
23366 : {
23367 : Relation child_rel;
23368 :
23369 248 : child_rel = table_open(mergingPartitionOid, NoLock);
23370 :
23371 248 : detachPartitionTable(rel, child_rel, defaultPartOid);
23372 :
23373 248 : table_close(child_rel, NoLock);
23374 : }
23375 :
23376 : /*
23377 : * Perform a preliminary check to determine whether it's safe to drop all
23378 : * merging partitions before we actually do so later. After merging rows
23379 : * into the new partitions via MergePartitionsMoveRows, all old partitions
23380 : * need to be dropped. However, since the drop behavior is DROP_RESTRICT
23381 : * and the merge process (MergePartitionsMoveRows) can be time-consuming,
23382 : * performing an early check on the drop eligibility of old partitions is
23383 : * preferable.
23384 : */
23385 456 : foreach_oid(mergingPartitionOid, mergingPartitions)
23386 : {
23387 : ObjectAddress object;
23388 :
23389 : /* Get oid of the later to be dropped relation. */
23390 244 : object.objectId = mergingPartitionOid;
23391 244 : object.classId = RelationRelationId;
23392 244 : object.objectSubId = 0;
23393 :
23394 244 : performDeletionCheck(&object, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
23395 : }
23396 :
23397 : /*
23398 : * Create a table for the new partition, using the partitioned table as a
23399 : * model.
23400 : */
23401 : Assert(OidIsValid(ownerId));
23402 106 : newPartRel = createPartitionTable(wqueue, cmd->name, rel, ownerId);
23403 :
23404 : /*
23405 : * Switch to the table owner's userid, so that any index functions are run
23406 : * as that user. Also, lockdown security-restricted operations and
23407 : * arrange to make GUC variable changes local to this command.
23408 : *
23409 : * Need to do it after determining the namespace in the
23410 : * createPartitionTable() call.
23411 : */
23412 90 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
23413 90 : SetUserIdAndSecContext(ownerId,
23414 : save_sec_context | SECURITY_RESTRICTED_OPERATION);
23415 90 : save_nestlevel = NewGUCNestLevel();
23416 90 : RestrictSearchPath();
23417 :
23418 : /* Copy data from merged partitions to the new partition. */
23419 90 : MergePartitionsMoveRows(wqueue, mergingPartitions, newPartRel);
23420 :
23421 : /* Drop the current partitions before attaching the new one. */
23422 388 : foreach_oid(mergingPartitionOid, mergingPartitions)
23423 : {
23424 : ObjectAddress object;
23425 :
23426 208 : object.objectId = mergingPartitionOid;
23427 208 : object.classId = RelationRelationId;
23428 208 : object.objectSubId = 0;
23429 :
23430 208 : performDeletion(&object, DROP_RESTRICT, 0);
23431 : }
23432 :
23433 90 : list_free(mergingPartitions);
23434 :
23435 : /*
23436 : * Attach a new partition to the partitioned table. wqueue = NULL:
23437 : * verification for each cloned constraint is not needed.
23438 : */
23439 90 : attachPartitionTable(NULL, rel, newPartRel, cmd->bound);
23440 :
23441 : /*
23442 : * Apply extension dependencies to the new partition's indexes. This
23443 : * preserves any "DEPENDS ON EXTENSION" settings from the merged
23444 : * partitions.
23445 : */
23446 90 : applyPartitionIndexExtDeps(RelationGetRelid(newPartRel), extDepState);
23447 :
23448 90 : freePartitionIndexExtDeps(extDepState);
23449 :
23450 : /* Keep the lock until commit. */
23451 90 : table_close(newPartRel, NoLock);
23452 :
23453 : /* Roll back any GUC changes executed by index functions. */
23454 90 : AtEOXact_GUC(false, save_nestlevel);
23455 :
23456 : /* Restore the userid and security context. */
23457 90 : SetUserIdAndSecContext(save_userid, save_sec_context);
23458 90 : }
23459 :
23460 : /*
23461 : * Struct with the context of the new partition for inserting rows from the
23462 : * split partition.
23463 : */
23464 : typedef struct SplitPartitionContext
23465 : {
23466 : ExprState *partqualstate; /* expression for checking a slot for a
23467 : * partition (NULL for DEFAULT partition) */
23468 : BulkInsertState bistate; /* state of bulk inserts for partition */
23469 : TupleTableSlot *dstslot; /* slot for inserting row into partition */
23470 : AlteredTableInfo *tab; /* structure with generated column expressions
23471 : * and check constraint expressions. */
23472 : Relation partRel; /* relation for partition */
23473 : } SplitPartitionContext;
23474 :
23475 : /*
23476 : * createSplitPartitionContext: create context for partition and fill it
23477 : */
23478 : static SplitPartitionContext *
23479 334 : createSplitPartitionContext(Relation partRel)
23480 : {
23481 : SplitPartitionContext *pc;
23482 :
23483 334 : pc = palloc0_object(SplitPartitionContext);
23484 334 : pc->partRel = partRel;
23485 :
23486 : /*
23487 : * Prepare a BulkInsertState for table_tuple_insert. The FSM is empty, so
23488 : * don't bother using it.
23489 : */
23490 334 : pc->bistate = GetBulkInsertState();
23491 :
23492 : /* Create a destination tuple slot for the new partition. */
23493 334 : pc->dstslot = table_slot_create(pc->partRel, NULL);
23494 :
23495 334 : return pc;
23496 : }
23497 :
23498 : /*
23499 : * deleteSplitPartitionContext: delete context for partition
23500 : */
23501 : static void
23502 334 : deleteSplitPartitionContext(SplitPartitionContext *pc, List **wqueue, uint32 ti_options)
23503 : {
23504 : ListCell *ltab;
23505 :
23506 334 : ExecDropSingleTupleTableSlot(pc->dstslot);
23507 334 : FreeBulkInsertState(pc->bistate);
23508 :
23509 334 : table_finish_bulk_insert(pc->partRel, ti_options);
23510 :
23511 : /*
23512 : * We don't need to process this pc->partRel so delete the ALTER TABLE
23513 : * queue of it.
23514 : */
23515 668 : foreach(ltab, *wqueue)
23516 : {
23517 668 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
23518 :
23519 668 : if (tab->relid == RelationGetRelid(pc->partRel))
23520 : {
23521 334 : *wqueue = list_delete_cell(*wqueue, ltab);
23522 334 : break;
23523 : }
23524 : }
23525 :
23526 334 : pfree(pc);
23527 334 : }
23528 :
23529 : /*
23530 : * SplitPartitionMoveRows: scan split partition (splitRel) of partitioned table
23531 : * (rel) and move rows into new partitions.
23532 : *
23533 : * New partitions description:
23534 : * partlist: list of pointers to SinglePartitionSpec structures. It contains
23535 : * the partition specification details for all new partitions.
23536 : * newPartRels: list of Relations, new partitions created in
23537 : * ATExecSplitPartition.
23538 : */
23539 : static void
23540 121 : SplitPartitionMoveRows(List **wqueue, Relation rel, Relation splitRel,
23541 : List *partlist, List *newPartRels)
23542 : {
23543 : /* The FSM is empty, so don't bother using it. */
23544 121 : uint32 ti_options = TABLE_INSERT_SKIP_FSM;
23545 : CommandId mycid;
23546 : EState *estate;
23547 : ListCell *listptr,
23548 : *listptr2;
23549 : TupleTableSlot *srcslot;
23550 : ExprContext *econtext;
23551 : TableScanDesc scan;
23552 : Snapshot snapshot;
23553 : MemoryContext oldCxt;
23554 121 : List *partContexts = NIL;
23555 : TupleConversionMap *tuple_map;
23556 121 : SplitPartitionContext *defaultPartCtx = NULL,
23557 : *pc;
23558 :
23559 121 : mycid = GetCurrentCommandId(true);
23560 :
23561 121 : estate = CreateExecutorState();
23562 :
23563 455 : forboth(listptr, partlist, listptr2, newPartRels)
23564 : {
23565 334 : SinglePartitionSpec *sps = (SinglePartitionSpec *) lfirst(listptr);
23566 :
23567 334 : pc = createSplitPartitionContext((Relation) lfirst(listptr2));
23568 :
23569 : /* Find the work queue entry for the new partition table: newPartRel. */
23570 334 : pc->tab = ATGetQueueEntry(wqueue, pc->partRel);
23571 :
23572 334 : buildExpressionExecutionStates(pc->tab, pc->partRel, estate);
23573 :
23574 334 : if (sps->bound->is_default)
23575 : {
23576 : /*
23577 : * We should not create a structure to check the partition
23578 : * constraint for the new DEFAULT partition.
23579 : */
23580 28 : defaultPartCtx = pc;
23581 : }
23582 : else
23583 : {
23584 : List *partConstraint;
23585 :
23586 : /* Build expression execution states for partition check quals. */
23587 306 : partConstraint = get_qual_from_partbound(rel, sps->bound);
23588 : partConstraint =
23589 306 : (List *) eval_const_expressions(NULL,
23590 : (Node *) partConstraint);
23591 : /* Make a boolean expression for ExecCheck(). */
23592 306 : partConstraint = list_make1(make_ands_explicit(partConstraint));
23593 :
23594 : /*
23595 : * Map the vars in the constraint expression from rel's attnos to
23596 : * splitRel's.
23597 : */
23598 306 : partConstraint = map_partition_varattnos(partConstraint,
23599 : 1, splitRel, rel);
23600 :
23601 306 : pc->partqualstate =
23602 306 : ExecPrepareExpr((Expr *) linitial(partConstraint), estate);
23603 : Assert(pc->partqualstate != NULL);
23604 : }
23605 :
23606 : /* Store partition context into a list. */
23607 334 : partContexts = lappend(partContexts, pc);
23608 : }
23609 :
23610 121 : econtext = GetPerTupleExprContext(estate);
23611 :
23612 : /* Create the necessary tuple slot. */
23613 121 : srcslot = table_slot_create(splitRel, NULL);
23614 :
23615 : /*
23616 : * Map computing for moving attributes of the split partition to the new
23617 : * partition (for the first new partition, but other new partitions can
23618 : * use the same map).
23619 : */
23620 121 : pc = (SplitPartitionContext *) lfirst(list_head(partContexts));
23621 121 : tuple_map = convert_tuples_by_name(RelationGetDescr(splitRel),
23622 121 : RelationGetDescr(pc->partRel));
23623 :
23624 : /* Scan through the rows. */
23625 121 : snapshot = RegisterSnapshot(GetLatestSnapshot());
23626 121 : scan = table_beginscan(splitRel, snapshot, 0, NULL,
23627 : SO_NONE);
23628 :
23629 : /*
23630 : * Switch to per-tuple memory context and reset it for each tuple
23631 : * produced, so we don't leak memory.
23632 : */
23633 121 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
23634 :
23635 544 : while (table_scan_getnextslot(scan, ForwardScanDirection, srcslot))
23636 : {
23637 423 : bool found = false;
23638 : TupleTableSlot *insertslot;
23639 :
23640 423 : CHECK_FOR_INTERRUPTS();
23641 :
23642 423 : econtext->ecxt_scantuple = srcslot;
23643 :
23644 : /* Search partition for the current slot, srcslot. */
23645 1138 : foreach(listptr, partContexts)
23646 : {
23647 1062 : pc = (SplitPartitionContext *) lfirst(listptr);
23648 :
23649 : /* skip DEFAULT partition */
23650 1062 : if (pc->partqualstate && ExecCheck(pc->partqualstate, econtext))
23651 : {
23652 347 : found = true;
23653 347 : break;
23654 : }
23655 : }
23656 423 : if (!found)
23657 : {
23658 : /* Use the DEFAULT partition if it exists. */
23659 76 : if (defaultPartCtx)
23660 76 : pc = defaultPartCtx;
23661 : else
23662 0 : ereport(ERROR,
23663 : errcode(ERRCODE_CHECK_VIOLATION),
23664 : errmsg("cannot find partition for split partition row"),
23665 : errtable(splitRel));
23666 : }
23667 :
23668 423 : if (tuple_map)
23669 : {
23670 : /* Need to use a map to copy attributes. */
23671 16 : insertslot = execute_attr_map_slot(tuple_map->attrMap, srcslot, pc->dstslot);
23672 : }
23673 : else
23674 : {
23675 : /* Extract data from the old tuple. */
23676 407 : slot_getallattrs(srcslot);
23677 :
23678 : /* Copy attributes directly. */
23679 407 : insertslot = pc->dstslot;
23680 :
23681 407 : ExecClearTuple(insertslot);
23682 :
23683 407 : memcpy(insertslot->tts_values, srcslot->tts_values,
23684 407 : sizeof(Datum) * srcslot->tts_nvalid);
23685 407 : memcpy(insertslot->tts_isnull, srcslot->tts_isnull,
23686 407 : sizeof(bool) * srcslot->tts_nvalid);
23687 :
23688 407 : ExecStoreVirtualTuple(insertslot);
23689 : }
23690 :
23691 : /*
23692 : * Constraints and GENERATED expressions might reference the tableoid
23693 : * column, so fill tts_tableOid with the desired value. (We must do
23694 : * this each time, because it gets overwritten with newrel's OID
23695 : * during storing.)
23696 : */
23697 423 : insertslot->tts_tableOid = RelationGetRelid(pc->partRel);
23698 :
23699 : /*
23700 : * Now, evaluate any generated expressions whose inputs come from the
23701 : * new tuple. We assume these columns won't reference each other, so
23702 : * that there's no ordering dependency.
23703 : */
23704 423 : evaluateGeneratedExpressionsAndCheckConstraints(pc->tab, pc->partRel,
23705 : insertslot, econtext);
23706 :
23707 : /* Write the tuple out to the new relation. */
23708 423 : table_tuple_insert(pc->partRel, insertslot, mycid,
23709 423 : ti_options, pc->bistate);
23710 :
23711 423 : ResetExprContext(econtext);
23712 : }
23713 :
23714 121 : MemoryContextSwitchTo(oldCxt);
23715 :
23716 121 : table_endscan(scan);
23717 121 : UnregisterSnapshot(snapshot);
23718 :
23719 121 : if (tuple_map)
23720 4 : free_conversion_map(tuple_map);
23721 :
23722 121 : ExecDropSingleTupleTableSlot(srcslot);
23723 :
23724 121 : FreeExecutorState(estate);
23725 :
23726 576 : foreach_ptr(SplitPartitionContext, spc, partContexts)
23727 334 : deleteSplitPartitionContext(spc, wqueue, ti_options);
23728 121 : }
23729 :
23730 : /*
23731 : * ALTER TABLE <name> SPLIT PARTITION <partition-name> INTO <partition-list>
23732 : */
23733 : static void
23734 129 : ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
23735 : PartitionCmd *cmd, AlterTableUtilityContext *context)
23736 : {
23737 : Relation splitRel;
23738 : Oid splitRelOid;
23739 : ListCell *listptr,
23740 : *listptr2;
23741 129 : bool isSameName = false;
23742 : char tmpRelName[NAMEDATALEN];
23743 129 : List *newPartRels = NIL;
23744 129 : List *extDepState = NIL;
23745 : ObjectAddress object;
23746 : Oid defaultPartOid;
23747 : Oid save_userid;
23748 : int save_sec_context;
23749 : int save_nestlevel;
23750 : List *splitPartList;
23751 :
23752 129 : defaultPartOid = get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
23753 :
23754 : /*
23755 : * Partition is already locked in the transformPartitionCmdForSplit
23756 : * function.
23757 : */
23758 129 : splitRel = table_openrv(cmd->name, NoLock);
23759 :
23760 129 : splitRelOid = RelationGetRelid(splitRel);
23761 :
23762 : /* Check descriptions of new partitions. */
23763 596 : foreach_node(SinglePartitionSpec, sps, cmd->partlist)
23764 : {
23765 : Oid existingRelid;
23766 :
23767 : /* Look up the existing relation by the new partition name. */
23768 346 : RangeVarGetAndCheckCreationNamespace(sps->name, NoLock, &existingRelid);
23769 :
23770 : /*
23771 : * This would fail later on anyway if the relation already exists. But
23772 : * by catching it here, we can emit a nicer error message.
23773 : */
23774 346 : if (existingRelid == splitRelOid && !isSameName)
23775 : /* One new partition can have the same name as a split partition. */
23776 29 : isSameName = true;
23777 317 : else if (OidIsValid(existingRelid))
23778 4 : ereport(ERROR,
23779 : errcode(ERRCODE_DUPLICATE_TABLE),
23780 : errmsg("relation \"%s\" already exists", sps->name->relname));
23781 : }
23782 :
23783 : /*
23784 : * Collect extension dependencies from indexes on the split partition. We
23785 : * must do this before detaching it, so we can restore the dependencies on
23786 : * the new partitions' indexes later.
23787 : */
23788 125 : splitPartList = list_make1_oid(splitRelOid);
23789 :
23790 125 : extDepState = collectPartitionIndexExtDeps(splitPartList);
23791 125 : list_free(splitPartList);
23792 :
23793 : /* Detach the split partition. */
23794 125 : detachPartitionTable(rel, splitRel, defaultPartOid);
23795 :
23796 : /*
23797 : * Perform a preliminary check to determine whether it's safe to drop the
23798 : * split partition before we actually do so later. After merging rows into
23799 : * the new partitions via SplitPartitionMoveRows, all old partitions need
23800 : * to be dropped. However, since the drop behavior is DROP_RESTRICT and
23801 : * the merge process (SplitPartitionMoveRows) can be time-consuming,
23802 : * performing an early check on the drop eligibility of old partitions is
23803 : * preferable.
23804 : */
23805 125 : object.objectId = splitRelOid;
23806 125 : object.classId = RelationRelationId;
23807 125 : object.objectSubId = 0;
23808 125 : performDeletionCheck(&object, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
23809 :
23810 : /*
23811 : * If a new partition has the same name as the split partition, then we
23812 : * should rename the split partition to reuse its name.
23813 : */
23814 125 : if (isSameName)
23815 : {
23816 : /*
23817 : * We must bump the command counter to make the split partition tuple
23818 : * visible for renaming.
23819 : */
23820 29 : CommandCounterIncrement();
23821 : /* Rename partition. */
23822 29 : sprintf(tmpRelName, "split-%u-%X-tmp", RelationGetRelid(rel), MyProcPid);
23823 29 : RenameRelationInternal(splitRelOid, tmpRelName, true, false);
23824 :
23825 : /*
23826 : * We must bump the command counter to make the split partition tuple
23827 : * visible after renaming.
23828 : */
23829 29 : CommandCounterIncrement();
23830 : }
23831 :
23832 : /* Create new partitions (like a split partition), without indexes. */
23833 580 : foreach_node(SinglePartitionSpec, sps, cmd->partlist)
23834 : {
23835 : Relation newPartRel;
23836 :
23837 338 : newPartRel = createPartitionTable(wqueue, sps->name, rel,
23838 338 : splitRel->rd_rel->relowner);
23839 334 : newPartRels = lappend(newPartRels, newPartRel);
23840 : }
23841 :
23842 : /*
23843 : * Switch to the table owner's userid, so that any index functions are run
23844 : * as that user. Also, lockdown security-restricted operations and
23845 : * arrange to make GUC variable changes local to this command.
23846 : *
23847 : * Need to do it after determining the namespace in the
23848 : * createPartitionTable() call.
23849 : */
23850 121 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
23851 121 : SetUserIdAndSecContext(splitRel->rd_rel->relowner,
23852 : save_sec_context | SECURITY_RESTRICTED_OPERATION);
23853 121 : save_nestlevel = NewGUCNestLevel();
23854 121 : RestrictSearchPath();
23855 :
23856 : /* Copy data from the split partition to the new partitions. */
23857 121 : SplitPartitionMoveRows(wqueue, rel, splitRel, cmd->partlist, newPartRels);
23858 : /* Keep the lock until commit. */
23859 121 : table_close(splitRel, NoLock);
23860 :
23861 : /* Attach new partitions to the partitioned table. */
23862 455 : forboth(listptr, cmd->partlist, listptr2, newPartRels)
23863 : {
23864 334 : SinglePartitionSpec *sps = (SinglePartitionSpec *) lfirst(listptr);
23865 334 : Relation newPartRel = (Relation) lfirst(listptr2);
23866 :
23867 : /*
23868 : * wqueue = NULL: verification for each cloned constraint is not
23869 : * needed.
23870 : */
23871 334 : attachPartitionTable(NULL, rel, newPartRel, sps->bound);
23872 :
23873 : /*
23874 : * Apply extension dependencies to the new partition's indexes. This
23875 : * preserves any "DEPENDS ON EXTENSION" settings from the split
23876 : * partition.
23877 : */
23878 334 : applyPartitionIndexExtDeps(RelationGetRelid(newPartRel), extDepState);
23879 :
23880 : /* Keep the lock until commit. */
23881 334 : table_close(newPartRel, NoLock);
23882 : }
23883 :
23884 121 : freePartitionIndexExtDeps(extDepState);
23885 :
23886 : /* Drop the split partition. */
23887 121 : object.classId = RelationRelationId;
23888 121 : object.objectId = splitRelOid;
23889 121 : object.objectSubId = 0;
23890 : /* Probably DROP_CASCADE is not needed. */
23891 121 : performDeletion(&object, DROP_RESTRICT, 0);
23892 :
23893 : /* Roll back any GUC changes executed by index functions. */
23894 121 : AtEOXact_GUC(false, save_nestlevel);
23895 :
23896 : /* Restore the userid and security context. */
23897 121 : SetUserIdAndSecContext(save_userid, save_sec_context);
23898 121 : }
|
