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_foreign_table.h"
44 : #include "catalog/pg_inherits.h"
45 : #include "catalog/pg_largeobject.h"
46 : #include "catalog/pg_largeobject_metadata.h"
47 : #include "catalog/pg_namespace.h"
48 : #include "catalog/pg_opclass.h"
49 : #include "catalog/pg_policy.h"
50 : #include "catalog/pg_proc.h"
51 : #include "catalog/pg_publication_rel.h"
52 : #include "catalog/pg_rewrite.h"
53 : #include "catalog/pg_statistic_ext.h"
54 : #include "catalog/pg_tablespace.h"
55 : #include "catalog/pg_trigger.h"
56 : #include "catalog/pg_type.h"
57 : #include "catalog/storage.h"
58 : #include "catalog/storage_xlog.h"
59 : #include "catalog/toasting.h"
60 : #include "commands/cluster.h"
61 : #include "commands/comment.h"
62 : #include "commands/defrem.h"
63 : #include "commands/event_trigger.h"
64 : #include "commands/sequence.h"
65 : #include "commands/tablecmds.h"
66 : #include "commands/tablespace.h"
67 : #include "commands/trigger.h"
68 : #include "commands/typecmds.h"
69 : #include "commands/user.h"
70 : #include "commands/vacuum.h"
71 : #include "common/int.h"
72 : #include "executor/executor.h"
73 : #include "foreign/fdwapi.h"
74 : #include "foreign/foreign.h"
75 : #include "miscadmin.h"
76 : #include "nodes/makefuncs.h"
77 : #include "nodes/nodeFuncs.h"
78 : #include "nodes/parsenodes.h"
79 : #include "optimizer/optimizer.h"
80 : #include "parser/parse_coerce.h"
81 : #include "parser/parse_collate.h"
82 : #include "parser/parse_expr.h"
83 : #include "parser/parse_relation.h"
84 : #include "parser/parse_type.h"
85 : #include "parser/parse_utilcmd.h"
86 : #include "parser/parser.h"
87 : #include "partitioning/partbounds.h"
88 : #include "partitioning/partdesc.h"
89 : #include "pgstat.h"
90 : #include "rewrite/rewriteDefine.h"
91 : #include "rewrite/rewriteHandler.h"
92 : #include "rewrite/rewriteManip.h"
93 : #include "storage/bufmgr.h"
94 : #include "storage/lmgr.h"
95 : #include "storage/lock.h"
96 : #include "storage/predicate.h"
97 : #include "storage/smgr.h"
98 : #include "tcop/utility.h"
99 : #include "utils/acl.h"
100 : #include "utils/builtins.h"
101 : #include "utils/fmgroids.h"
102 : #include "utils/inval.h"
103 : #include "utils/lsyscache.h"
104 : #include "utils/memutils.h"
105 : #include "utils/partcache.h"
106 : #include "utils/relcache.h"
107 : #include "utils/ruleutils.h"
108 : #include "utils/snapmgr.h"
109 : #include "utils/syscache.h"
110 : #include "utils/timestamp.h"
111 : #include "utils/typcache.h"
112 : #include "utils/usercontext.h"
113 :
114 : /*
115 : * ON COMMIT action list
116 : */
117 : typedef struct OnCommitItem
118 : {
119 : Oid relid; /* relid of relation */
120 : OnCommitAction oncommit; /* what to do at end of xact */
121 :
122 : /*
123 : * If this entry was created during the current transaction,
124 : * creating_subid is the ID of the creating subxact; if created in a prior
125 : * transaction, creating_subid is zero. If deleted during the current
126 : * transaction, deleting_subid is the ID of the deleting subxact; if no
127 : * deletion request is pending, deleting_subid is zero.
128 : */
129 : SubTransactionId creating_subid;
130 : SubTransactionId deleting_subid;
131 : } OnCommitItem;
132 :
133 : static List *on_commits = NIL;
134 :
135 :
136 : /*
137 : * State information for ALTER TABLE
138 : *
139 : * The pending-work queue for an ALTER TABLE is a List of AlteredTableInfo
140 : * structs, one for each table modified by the operation (the named table
141 : * plus any child tables that are affected). We save lists of subcommands
142 : * to apply to this table (possibly modified by parse transformation steps);
143 : * these lists will be executed in Phase 2. If a Phase 3 step is needed,
144 : * necessary information is stored in the constraints and newvals lists.
145 : *
146 : * Phase 2 is divided into multiple passes; subcommands are executed in
147 : * a pass determined by subcommand type.
148 : */
149 :
150 : typedef enum AlterTablePass
151 : {
152 : AT_PASS_UNSET = -1, /* UNSET will cause ERROR */
153 : AT_PASS_DROP, /* DROP (all flavors) */
154 : AT_PASS_ALTER_TYPE, /* ALTER COLUMN TYPE */
155 : AT_PASS_ADD_COL, /* ADD COLUMN */
156 : AT_PASS_SET_EXPRESSION, /* ALTER SET EXPRESSION */
157 : AT_PASS_OLD_INDEX, /* re-add existing indexes */
158 : AT_PASS_OLD_CONSTR, /* re-add existing constraints */
159 : /* We could support a RENAME COLUMN pass here, but not currently used */
160 : AT_PASS_ADD_CONSTR, /* ADD constraints (initial examination) */
161 : AT_PASS_COL_ATTRS, /* set column attributes, eg NOT NULL */
162 : AT_PASS_ADD_INDEXCONSTR, /* ADD index-based constraints */
163 : AT_PASS_ADD_INDEX, /* ADD indexes */
164 : AT_PASS_ADD_OTHERCONSTR, /* ADD other constraints, defaults */
165 : AT_PASS_MISC, /* other stuff */
166 : } AlterTablePass;
167 :
168 : #define AT_NUM_PASSES (AT_PASS_MISC + 1)
169 :
170 : typedef struct AlteredTableInfo
171 : {
172 : /* Information saved before any work commences: */
173 : Oid relid; /* Relation to work on */
174 : char relkind; /* Its relkind */
175 : TupleDesc oldDesc; /* Pre-modification tuple descriptor */
176 :
177 : /*
178 : * Transiently set during Phase 2, normally set to NULL.
179 : *
180 : * ATRewriteCatalogs sets this when it starts, and closes when ATExecCmd
181 : * returns control. This can be exploited by ATExecCmd subroutines to
182 : * close/reopen across transaction boundaries.
183 : */
184 : Relation rel;
185 :
186 : /* Information saved by Phase 1 for Phase 2: */
187 : List *subcmds[AT_NUM_PASSES]; /* Lists of AlterTableCmd */
188 : /* Information saved by Phases 1/2 for Phase 3: */
189 : List *constraints; /* List of NewConstraint */
190 : List *newvals; /* List of NewColumnValue */
191 : List *afterStmts; /* List of utility command parsetrees */
192 : bool verify_new_notnull; /* T if we should recheck NOT NULL */
193 : int rewrite; /* Reason for forced rewrite, if any */
194 : bool chgAccessMethod; /* T if SET ACCESS METHOD is used */
195 : Oid newAccessMethod; /* new access method; 0 means no change,
196 : * if above is true */
197 : Oid newTableSpace; /* new tablespace; 0 means no change */
198 : bool chgPersistence; /* T if SET LOGGED/UNLOGGED is used */
199 : char newrelpersistence; /* if above is true */
200 : Expr *partition_constraint; /* for attach partition validation */
201 : /* true, if validating default due to some other attach/detach */
202 : bool validate_default;
203 : /* Objects to rebuild after completing ALTER TYPE operations */
204 : List *changedConstraintOids; /* OIDs of constraints to rebuild */
205 : List *changedConstraintDefs; /* string definitions of same */
206 : List *changedIndexOids; /* OIDs of indexes to rebuild */
207 : List *changedIndexDefs; /* string definitions of same */
208 : char *replicaIdentityIndex; /* index to reset as REPLICA IDENTITY */
209 : char *clusterOnIndex; /* index to use for CLUSTER */
210 : List *changedStatisticsOids; /* OIDs of statistics to rebuild */
211 : List *changedStatisticsDefs; /* string definitions of same */
212 : } AlteredTableInfo;
213 :
214 : /* Struct describing one new constraint to check in Phase 3 scan */
215 : /* Note: new not-null constraints are handled elsewhere */
216 : typedef struct NewConstraint
217 : {
218 : char *name; /* Constraint name, or NULL if none */
219 : ConstrType contype; /* CHECK or FOREIGN */
220 : Oid refrelid; /* PK rel, if FOREIGN */
221 : Oid refindid; /* OID of PK's index, if FOREIGN */
222 : bool conwithperiod; /* Whether the new FOREIGN KEY uses PERIOD */
223 : Oid conid; /* OID of pg_constraint entry, if FOREIGN */
224 : Node *qual; /* Check expr or CONSTR_FOREIGN Constraint */
225 : ExprState *qualstate; /* Execution state for CHECK expr */
226 : } NewConstraint;
227 :
228 : /*
229 : * Struct describing one new column value that needs to be computed during
230 : * Phase 3 copy (this could be either a new column with a non-null default, or
231 : * a column that we're changing the type of). Columns without such an entry
232 : * are just copied from the old table during ATRewriteTable. Note that the
233 : * expr is an expression over *old* table values, except when is_generated
234 : * is true; then it is an expression over columns of the *new* tuple.
235 : */
236 : typedef struct NewColumnValue
237 : {
238 : AttrNumber attnum; /* which column */
239 : Expr *expr; /* expression to compute */
240 : ExprState *exprstate; /* execution state */
241 : bool is_generated; /* is it a GENERATED expression? */
242 : } NewColumnValue;
243 :
244 : /*
245 : * Error-reporting support for RemoveRelations
246 : */
247 : struct dropmsgstrings
248 : {
249 : char kind;
250 : int nonexistent_code;
251 : const char *nonexistent_msg;
252 : const char *skipping_msg;
253 : const char *nota_msg;
254 : const char *drophint_msg;
255 : };
256 :
257 : static const struct dropmsgstrings dropmsgstringarray[] = {
258 : {RELKIND_RELATION,
259 : ERRCODE_UNDEFINED_TABLE,
260 : gettext_noop("table \"%s\" does not exist"),
261 : gettext_noop("table \"%s\" does not exist, skipping"),
262 : gettext_noop("\"%s\" is not a table"),
263 : gettext_noop("Use DROP TABLE to remove a table.")},
264 : {RELKIND_SEQUENCE,
265 : ERRCODE_UNDEFINED_TABLE,
266 : gettext_noop("sequence \"%s\" does not exist"),
267 : gettext_noop("sequence \"%s\" does not exist, skipping"),
268 : gettext_noop("\"%s\" is not a sequence"),
269 : gettext_noop("Use DROP SEQUENCE to remove a sequence.")},
270 : {RELKIND_VIEW,
271 : ERRCODE_UNDEFINED_TABLE,
272 : gettext_noop("view \"%s\" does not exist"),
273 : gettext_noop("view \"%s\" does not exist, skipping"),
274 : gettext_noop("\"%s\" is not a view"),
275 : gettext_noop("Use DROP VIEW to remove a view.")},
276 : {RELKIND_MATVIEW,
277 : ERRCODE_UNDEFINED_TABLE,
278 : gettext_noop("materialized view \"%s\" does not exist"),
279 : gettext_noop("materialized view \"%s\" does not exist, skipping"),
280 : gettext_noop("\"%s\" is not a materialized view"),
281 : gettext_noop("Use DROP MATERIALIZED VIEW to remove a materialized view.")},
282 : {RELKIND_INDEX,
283 : ERRCODE_UNDEFINED_OBJECT,
284 : gettext_noop("index \"%s\" does not exist"),
285 : gettext_noop("index \"%s\" does not exist, skipping"),
286 : gettext_noop("\"%s\" is not an index"),
287 : gettext_noop("Use DROP INDEX to remove an index.")},
288 : {RELKIND_COMPOSITE_TYPE,
289 : ERRCODE_UNDEFINED_OBJECT,
290 : gettext_noop("type \"%s\" does not exist"),
291 : gettext_noop("type \"%s\" does not exist, skipping"),
292 : gettext_noop("\"%s\" is not a type"),
293 : gettext_noop("Use DROP TYPE to remove a type.")},
294 : {RELKIND_FOREIGN_TABLE,
295 : ERRCODE_UNDEFINED_OBJECT,
296 : gettext_noop("foreign table \"%s\" does not exist"),
297 : gettext_noop("foreign table \"%s\" does not exist, skipping"),
298 : gettext_noop("\"%s\" is not a foreign table"),
299 : gettext_noop("Use DROP FOREIGN TABLE to remove a foreign table.")},
300 : {RELKIND_PARTITIONED_TABLE,
301 : ERRCODE_UNDEFINED_TABLE,
302 : gettext_noop("table \"%s\" does not exist"),
303 : gettext_noop("table \"%s\" does not exist, skipping"),
304 : gettext_noop("\"%s\" is not a table"),
305 : gettext_noop("Use DROP TABLE to remove a table.")},
306 : {RELKIND_PARTITIONED_INDEX,
307 : ERRCODE_UNDEFINED_OBJECT,
308 : gettext_noop("index \"%s\" does not exist"),
309 : gettext_noop("index \"%s\" does not exist, skipping"),
310 : gettext_noop("\"%s\" is not an index"),
311 : gettext_noop("Use DROP INDEX to remove an index.")},
312 : {RELKIND_PROPGRAPH,
313 : ERRCODE_UNDEFINED_OBJECT,
314 : gettext_noop("property graph \"%s\" does not exist"),
315 : gettext_noop("property graph \"%s\" does not exist, skipping"),
316 : gettext_noop("\"%s\" is not a property graph"),
317 : gettext_noop("Use DROP PROPERTY GRAPH to remove a property graph.")},
318 : {'\0', 0, NULL, NULL, NULL, NULL}
319 : };
320 :
321 : /* communication between RemoveRelations and RangeVarCallbackForDropRelation */
322 : struct DropRelationCallbackState
323 : {
324 : /* These fields are set by RemoveRelations: */
325 : char expected_relkind;
326 : LOCKMODE heap_lockmode;
327 : /* These fields are state to track which subsidiary locks are held: */
328 : Oid heapOid;
329 : Oid partParentOid;
330 : /* These fields are passed back by RangeVarCallbackForDropRelation: */
331 : char actual_relkind;
332 : char actual_relpersistence;
333 : };
334 :
335 : /* Alter table target-type flags for ATSimplePermissions */
336 : #define ATT_TABLE 0x0001
337 : #define ATT_VIEW 0x0002
338 : #define ATT_MATVIEW 0x0004
339 : #define ATT_INDEX 0x0008
340 : #define ATT_COMPOSITE_TYPE 0x0010
341 : #define ATT_FOREIGN_TABLE 0x0020
342 : #define ATT_PARTITIONED_INDEX 0x0040
343 : #define ATT_SEQUENCE 0x0080
344 : #define ATT_PARTITIONED_TABLE 0x0100
345 :
346 : /*
347 : * ForeignTruncateInfo
348 : *
349 : * Information related to truncation of foreign tables. This is used for
350 : * the elements in a hash table. It uses the server OID as lookup key,
351 : * and includes a per-server list of all foreign tables involved in the
352 : * truncation.
353 : */
354 : typedef struct ForeignTruncateInfo
355 : {
356 : Oid serverid;
357 : List *rels;
358 : } ForeignTruncateInfo;
359 :
360 : /* Partial or complete FK creation in addFkConstraint() */
361 : typedef enum addFkConstraintSides
362 : {
363 : addFkReferencedSide,
364 : addFkReferencingSide,
365 : addFkBothSides,
366 : } addFkConstraintSides;
367 :
368 : /*
369 : * Partition tables are expected to be dropped when the parent partitioned
370 : * table gets dropped. Hence for partitioning we use AUTO dependency.
371 : * Otherwise, for regular inheritance use NORMAL dependency.
372 : */
373 : #define child_dependency_type(child_is_partition) \
374 : ((child_is_partition) ? DEPENDENCY_AUTO : DEPENDENCY_NORMAL)
375 :
376 : static void truncate_check_rel(Oid relid, Form_pg_class reltuple);
377 : static void truncate_check_perms(Oid relid, Form_pg_class reltuple);
378 : static void truncate_check_activity(Relation rel);
379 : static void RangeVarCallbackForTruncate(const RangeVar *relation,
380 : Oid relId, Oid oldRelId, void *arg);
381 : static List *MergeAttributes(List *columns, const List *supers, char relpersistence,
382 : bool is_partition, List **supconstr,
383 : List **supnotnulls);
384 : static List *MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced);
385 : static void MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef);
386 : static ColumnDef *MergeInheritedAttribute(List *inh_columns, int exist_attno, const ColumnDef *newdef);
387 : static void MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition);
388 : static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel);
389 : static void StoreCatalogInheritance(Oid relationId, List *supers,
390 : bool child_is_partition);
391 : static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
392 : int32 seqNumber, Relation inhRelation,
393 : bool child_is_partition);
394 : static int findAttrByName(const char *attributeName, const List *columns);
395 : static void AlterIndexNamespaces(Relation classRel, Relation rel,
396 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved);
397 : static void AlterSeqNamespaces(Relation classRel, Relation rel,
398 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
399 : LOCKMODE lockmode);
400 : static ObjectAddress ATExecAlterConstraint(List **wqueue, Relation rel,
401 : ATAlterConstraint *cmdcon,
402 : bool recurse, LOCKMODE lockmode);
403 : static bool ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon, Relation conrel,
404 : Relation tgrel, Relation rel, HeapTuple contuple,
405 : bool recurse, LOCKMODE lockmode);
406 : static bool ATExecAlterFKConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
407 : Relation conrel, Relation tgrel,
408 : Oid fkrelid, Oid pkrelid,
409 : HeapTuple contuple, LOCKMODE lockmode,
410 : Oid ReferencedParentDelTrigger,
411 : Oid ReferencedParentUpdTrigger,
412 : Oid ReferencingParentInsTrigger,
413 : Oid ReferencingParentUpdTrigger);
414 : static bool ATExecAlterCheckConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
415 : Relation conrel, HeapTuple contuple,
416 : bool recurse, bool recursing,
417 : LOCKMODE lockmode);
418 : static bool ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
419 : Relation conrel, Relation tgrel, Relation rel,
420 : HeapTuple contuple, bool recurse,
421 : List **otherrelids, LOCKMODE lockmode);
422 : static bool ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
423 : Relation conrel, Relation rel,
424 : HeapTuple contuple, LOCKMODE lockmode);
425 : static void AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
426 : bool deferrable, bool initdeferred,
427 : List **otherrelids);
428 : static void AlterFKConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
429 : Relation conrel, Relation tgrel,
430 : Oid fkrelid, Oid pkrelid,
431 : HeapTuple contuple, LOCKMODE lockmode,
432 : Oid ReferencedParentDelTrigger,
433 : Oid ReferencedParentUpdTrigger,
434 : Oid ReferencingParentInsTrigger,
435 : Oid ReferencingParentUpdTrigger);
436 : static void AlterCheckConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
437 : Relation conrel, Oid conrelid,
438 : bool recurse, bool recursing,
439 : LOCKMODE lockmode);
440 : static void AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
441 : Relation conrel, Relation tgrel, Relation rel,
442 : HeapTuple contuple, bool recurse,
443 : List **otherrelids, LOCKMODE lockmode);
444 : static void AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
445 : HeapTuple contuple);
446 : static ObjectAddress ATExecValidateConstraint(List **wqueue,
447 : Relation rel, char *constrName,
448 : bool recurse, bool recursing, LOCKMODE lockmode);
449 : static void QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
450 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode);
451 : static void QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
452 : char *constrName, HeapTuple contuple,
453 : bool recurse, bool recursing, LOCKMODE lockmode);
454 : static void QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
455 : HeapTuple contuple, bool recurse, bool recursing,
456 : LOCKMODE lockmode);
457 : static int transformColumnNameList(Oid relId, List *colList,
458 : int16 *attnums, Oid *atttypids, Oid *attcollids);
459 : static int transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
460 : List **attnamelist,
461 : int16 *attnums, Oid *atttypids, Oid *attcollids,
462 : Oid *opclasses, bool *pk_has_without_overlaps);
463 : static Oid transformFkeyCheckAttrs(Relation pkrel,
464 : int numattrs, int16 *attnums,
465 : bool with_period, Oid *opclasses,
466 : bool *pk_has_without_overlaps);
467 : static void checkFkeyPermissions(Relation rel, int16 *attnums, int natts);
468 : static CoercionPathType findFkeyCast(Oid targetTypeId, Oid sourceTypeId,
469 : Oid *funcid);
470 : static void validateForeignKeyConstraint(char *conname,
471 : Relation rel, Relation pkrel,
472 : Oid pkindOid, Oid constraintOid, bool hasperiod);
473 : static void CheckAlterTableIsSafe(Relation rel);
474 : static void ATController(AlterTableStmt *parsetree,
475 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
476 : AlterTableUtilityContext *context);
477 : static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
478 : bool recurse, bool recursing, LOCKMODE lockmode,
479 : AlterTableUtilityContext *context);
480 : static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
481 : AlterTableUtilityContext *context);
482 : static void ATExecCmd(List **wqueue, AlteredTableInfo *tab,
483 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
484 : AlterTableUtilityContext *context);
485 : static AlterTableCmd *ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab,
486 : Relation rel, AlterTableCmd *cmd,
487 : bool recurse, LOCKMODE lockmode,
488 : AlterTablePass cur_pass,
489 : AlterTableUtilityContext *context);
490 : static void ATRewriteTables(AlterTableStmt *parsetree,
491 : List **wqueue, LOCKMODE lockmode,
492 : AlterTableUtilityContext *context);
493 : static void ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap);
494 : static AlteredTableInfo *ATGetQueueEntry(List **wqueue, Relation rel);
495 : static void ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets);
496 : static void ATSimpleRecursion(List **wqueue, Relation rel,
497 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
498 : AlterTableUtilityContext *context);
499 : static void ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode);
500 : static void ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
501 : LOCKMODE lockmode,
502 : AlterTableUtilityContext *context);
503 : static List *find_typed_table_dependencies(Oid typeOid, const char *typeName,
504 : DropBehavior behavior);
505 : static void ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
506 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
507 : AlterTableUtilityContext *context);
508 : static ObjectAddress ATExecAddColumn(List **wqueue, AlteredTableInfo *tab,
509 : Relation rel, AlterTableCmd **cmd,
510 : bool recurse, bool recursing,
511 : LOCKMODE lockmode, AlterTablePass cur_pass,
512 : AlterTableUtilityContext *context);
513 : static bool check_for_column_name_collision(Relation rel, const char *colname,
514 : bool if_not_exists);
515 : static void add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid);
516 : static void add_column_collation_dependency(Oid relid, int32 attnum, Oid collid);
517 : static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
518 : LOCKMODE lockmode);
519 : static void set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
520 : bool is_valid, bool queue_validation);
521 : static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
522 : char *conName, char *colName,
523 : bool recurse, bool recursing,
524 : LOCKMODE lockmode);
525 : static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
526 : static bool ConstraintImpliedByRelConstraint(Relation scanrel,
527 : List *testConstraint, List *provenConstraint);
528 : static ObjectAddress ATExecColumnDefault(Relation rel, const char *colName,
529 : Node *newDefault, LOCKMODE lockmode);
530 : static ObjectAddress ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
531 : Node *newDefault);
532 : static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,
533 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
534 : static ObjectAddress ATExecSetIdentity(Relation rel, const char *colName,
535 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
536 : static ObjectAddress ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
537 : bool recurse, bool recursing);
538 : static ObjectAddress ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
539 : Node *newExpr, LOCKMODE lockmode);
540 : static void ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode);
541 : static ObjectAddress ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode);
542 : static ObjectAddress ATExecSetStatistics(Relation rel, const char *colName, int16 colNum,
543 : Node *newValue, LOCKMODE lockmode);
544 : static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
545 : Node *options, bool isReset, LOCKMODE lockmode);
546 : static ObjectAddress ATExecSetStorage(Relation rel, const char *colName,
547 : Node *newValue, LOCKMODE lockmode);
548 : static void ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
549 : AlterTableCmd *cmd, LOCKMODE lockmode,
550 : AlterTableUtilityContext *context);
551 : static ObjectAddress ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
552 : DropBehavior behavior,
553 : bool recurse, bool recursing,
554 : bool missing_ok, LOCKMODE lockmode,
555 : ObjectAddresses *addrs);
556 : static void ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
557 : bool recurse, LOCKMODE lockmode,
558 : AlterTableUtilityContext *context);
559 : static void verifyNotNullPKCompatible(HeapTuple tuple, const char *colname);
560 : static ObjectAddress ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
561 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
562 : static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
563 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
564 : static ObjectAddress ATExecAddConstraint(List **wqueue,
565 : AlteredTableInfo *tab, Relation rel,
566 : Constraint *newConstraint, bool recurse, bool is_readd,
567 : LOCKMODE lockmode);
568 : static char *ChooseForeignKeyConstraintNameAddition(List *colnames);
569 : static ObjectAddress ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
570 : IndexStmt *stmt, LOCKMODE lockmode);
571 : static ObjectAddress ATAddCheckNNConstraint(List **wqueue,
572 : AlteredTableInfo *tab, Relation rel,
573 : Constraint *constr,
574 : bool recurse, bool recursing, bool is_readd,
575 : LOCKMODE lockmode);
576 : static ObjectAddress ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab,
577 : Relation rel, Constraint *fkconstraint,
578 : bool recurse, bool recursing,
579 : LOCKMODE lockmode);
580 : static int validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
581 : int numfksetcols, int16 *fksetcolsattnums,
582 : List *fksetcols);
583 : static ObjectAddress addFkConstraint(addFkConstraintSides fkside,
584 : char *constraintname,
585 : Constraint *fkconstraint, Relation rel,
586 : Relation pkrel, Oid indexOid,
587 : Oid parentConstr,
588 : int numfks, int16 *pkattnum, int16 *fkattnum,
589 : Oid *pfeqoperators, Oid *ppeqoperators,
590 : Oid *ffeqoperators, int numfkdelsetcols,
591 : int16 *fkdelsetcols, bool is_internal,
592 : bool with_period);
593 : static void addFkRecurseReferenced(Constraint *fkconstraint,
594 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
595 : int numfks, int16 *pkattnum, int16 *fkattnum,
596 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
597 : int numfkdelsetcols, int16 *fkdelsetcols,
598 : bool old_check_ok,
599 : Oid parentDelTrigger, Oid parentUpdTrigger,
600 : bool with_period);
601 : static void addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint,
602 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
603 : int numfks, int16 *pkattnum, int16 *fkattnum,
604 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
605 : int numfkdelsetcols, int16 *fkdelsetcols,
606 : bool old_check_ok, LOCKMODE lockmode,
607 : Oid parentInsTrigger, Oid parentUpdTrigger,
608 : bool with_period);
609 : static void CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
610 : Relation partitionRel);
611 : static void CloneFkReferenced(Relation parentRel, Relation partitionRel);
612 : static void CloneFkReferencing(List **wqueue, Relation parentRel,
613 : Relation partRel);
614 : static void createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
615 : Constraint *fkconstraint, Oid constraintOid,
616 : Oid indexOid,
617 : Oid parentInsTrigger, Oid parentUpdTrigger,
618 : Oid *insertTrigOid, Oid *updateTrigOid);
619 : static void createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid,
620 : Constraint *fkconstraint, Oid constraintOid,
621 : Oid indexOid,
622 : Oid parentDelTrigger, Oid parentUpdTrigger,
623 : Oid *deleteTrigOid, Oid *updateTrigOid);
624 : static bool tryAttachPartitionForeignKey(List **wqueue,
625 : ForeignKeyCacheInfo *fk,
626 : Relation partition,
627 : Oid parentConstrOid, int numfks,
628 : AttrNumber *mapped_conkey, AttrNumber *confkey,
629 : Oid *conpfeqop,
630 : Oid parentInsTrigger,
631 : Oid parentUpdTrigger,
632 : Relation trigrel);
633 : static void AttachPartitionForeignKey(List **wqueue, Relation partition,
634 : Oid partConstrOid, Oid parentConstrOid,
635 : Oid parentInsTrigger, Oid parentUpdTrigger,
636 : Relation trigrel);
637 : static void RemoveInheritedConstraint(Relation conrel, Relation trigrel,
638 : Oid conoid, Oid conrelid);
639 : static void DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid,
640 : Oid confrelid, Oid conrelid);
641 : static void GetForeignKeyActionTriggers(Relation trigrel,
642 : Oid conoid, Oid confrelid, Oid conrelid,
643 : Oid *deleteTriggerOid,
644 : Oid *updateTriggerOid);
645 : static void GetForeignKeyCheckTriggers(Relation trigrel,
646 : Oid conoid, Oid confrelid, Oid conrelid,
647 : Oid *insertTriggerOid,
648 : Oid *updateTriggerOid);
649 : static void ATExecDropConstraint(Relation rel, const char *constrName,
650 : DropBehavior behavior, bool recurse,
651 : bool missing_ok, LOCKMODE lockmode);
652 : static ObjectAddress dropconstraint_internal(Relation rel,
653 : HeapTuple constraintTup, DropBehavior behavior,
654 : bool recurse, bool recursing,
655 : bool missing_ok, LOCKMODE lockmode);
656 : static void ATPrepAlterColumnType(List **wqueue,
657 : AlteredTableInfo *tab, Relation rel,
658 : bool recurse, bool recursing,
659 : AlterTableCmd *cmd, LOCKMODE lockmode,
660 : AlterTableUtilityContext *context);
661 : static bool ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno);
662 : static ObjectAddress ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
663 : AlterTableCmd *cmd, LOCKMODE lockmode);
664 : static void RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
665 : Relation rel, AttrNumber attnum, const char *colName);
666 : static void RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab);
667 : static void RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab);
668 : static void RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab);
669 : static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab,
670 : LOCKMODE lockmode);
671 : static void ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId,
672 : char *cmd, List **wqueue, LOCKMODE lockmode,
673 : bool rewrite);
674 : static void RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass,
675 : Oid objid, Relation rel, List *domname,
676 : const char *conname);
677 : static void TryReuseIndex(Oid oldId, IndexStmt *stmt);
678 : static void TryReuseForeignKey(Oid oldId, Constraint *con);
679 : static ObjectAddress ATExecAlterColumnGenericOptions(Relation rel, const char *colName,
680 : List *options, LOCKMODE lockmode);
681 : static void change_owner_fix_column_acls(Oid relationOid,
682 : Oid oldOwnerId, Oid newOwnerId);
683 : static void change_owner_recurse_to_sequences(Oid relationOid,
684 : Oid newOwnerId, LOCKMODE lockmode);
685 : static ObjectAddress ATExecClusterOn(Relation rel, const char *indexName,
686 : LOCKMODE lockmode);
687 : static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
688 : static void ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname);
689 : static void ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId);
690 : static void ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel,
691 : bool toLogged);
692 : static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
693 : const char *tablespacename, LOCKMODE lockmode);
694 : static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
695 : static void ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace);
696 : static void ATExecSetRelOptions(Relation rel, List *defList,
697 : AlterTableType operation,
698 : LOCKMODE lockmode);
699 : static void ATExecEnableDisableTrigger(Relation rel, const char *trigname,
700 : char fires_when, bool skip_system, bool recurse,
701 : LOCKMODE lockmode);
702 : static void ATExecEnableDisableRule(Relation rel, const char *rulename,
703 : char fires_when, LOCKMODE lockmode);
704 : static void ATPrepChangeInherit(Relation child_rel);
705 : static ObjectAddress ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode);
706 : static ObjectAddress ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode);
707 : static void drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
708 : DependencyType deptype);
709 : static ObjectAddress ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode);
710 : static void ATExecDropOf(Relation rel, LOCKMODE lockmode);
711 : static void ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode);
712 : static void ATExecGenericOptions(Relation rel, List *options);
713 : static void ATExecSetRowSecurity(Relation rel, bool rls);
714 : static void ATExecForceNoForceRowSecurity(Relation rel, bool force_rls);
715 : static ObjectAddress ATExecSetCompression(Relation rel,
716 : const char *column, Node *newValue, LOCKMODE lockmode);
717 :
718 : static void index_copy_data(Relation rel, RelFileLocator newrlocator);
719 : static const char *storage_name(char c);
720 :
721 : static void RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid,
722 : Oid oldRelOid, void *arg);
723 : static void RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid,
724 : Oid oldrelid, void *arg);
725 : static PartitionSpec *transformPartitionSpec(Relation rel, PartitionSpec *partspec);
726 : static void ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
727 : List **partexprs, Oid *partopclass, Oid *partcollation,
728 : PartitionStrategy strategy);
729 : static void CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition);
730 : static void RemoveInheritance(Relation child_rel, Relation parent_rel,
731 : bool expect_detached);
732 : static ObjectAddress ATExecAttachPartition(List **wqueue, Relation rel,
733 : PartitionCmd *cmd,
734 : AlterTableUtilityContext *context);
735 : static void AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel);
736 : static void QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
737 : List *partConstraint,
738 : bool validate_default);
739 : static void CloneRowTriggersToPartition(Relation parent, Relation partition);
740 : static void DropClonedTriggersFromPartition(Oid partitionId);
741 : static ObjectAddress ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab,
742 : Relation rel, RangeVar *name,
743 : bool concurrent);
744 : static void DetachPartitionFinalize(Relation rel, Relation partRel,
745 : bool concurrent, Oid defaultPartOid);
746 : static ObjectAddress ATExecDetachPartitionFinalize(Relation rel, RangeVar *name);
747 : static ObjectAddress ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx,
748 : RangeVar *name);
749 : static void validatePartitionedIndex(Relation partedIdx, Relation partedTbl);
750 : static void refuseDupeIndexAttach(Relation parentIdx, Relation partIdx,
751 : Relation partitionTbl);
752 : static void verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition);
753 : static List *GetParentedForeignKeyRefs(Relation partition);
754 : static void ATDetachCheckNoForeignKeyRefs(Relation partition);
755 : static char GetAttributeCompression(Oid atttypid, const char *compression);
756 : static char GetAttributeStorage(Oid atttypid, const char *storagemode);
757 :
758 : static void ATExecMergePartitions(List **wqueue, AlteredTableInfo *tab, Relation rel,
759 : PartitionCmd *cmd, AlterTableUtilityContext *context);
760 : static void ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab,
761 : Relation rel, PartitionCmd *cmd,
762 : AlterTableUtilityContext *context);
763 :
764 : /* ----------------------------------------------------------------
765 : * DefineRelation
766 : * Creates a new relation.
767 : *
768 : * stmt carries parsetree information from an ordinary CREATE TABLE statement.
769 : * The other arguments are used to extend the behavior for other cases:
770 : * relkind: relkind to assign to the new relation
771 : * ownerId: if not InvalidOid, use this as the new relation's owner.
772 : * typaddress: if not null, it's set to the pg_type entry's address.
773 : * queryString: for error reporting
774 : *
775 : * Note that permissions checks are done against current user regardless of
776 : * ownerId. A nonzero ownerId is used when someone is creating a relation
777 : * "on behalf of" someone else, so we still want to see that the current user
778 : * has permissions to do it.
779 : *
780 : * If successful, returns the address of the new relation.
781 : * ----------------------------------------------------------------
782 : */
783 : ObjectAddress
784 39800 : DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
785 : ObjectAddress *typaddress, const char *queryString)
786 : {
787 : char relname[NAMEDATALEN];
788 : Oid namespaceId;
789 : Oid relationId;
790 : Oid tablespaceId;
791 : Relation rel;
792 : TupleDesc descriptor;
793 : List *inheritOids;
794 : List *old_constraints;
795 : List *old_notnulls;
796 : List *rawDefaults;
797 : List *cookedDefaults;
798 : List *nncols;
799 39800 : List *connames = NIL;
800 : Datum reloptions;
801 : ListCell *listptr;
802 : AttrNumber attnum;
803 : bool partitioned;
804 39800 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
805 : Oid ofTypeId;
806 : ObjectAddress address;
807 : LOCKMODE parentLockmode;
808 39800 : Oid accessMethodId = InvalidOid;
809 :
810 : /*
811 : * Truncate relname to appropriate length (probably a waste of time, as
812 : * parser should have done this already).
813 : */
814 39800 : strlcpy(relname, stmt->relation->relname, NAMEDATALEN);
815 :
816 : /*
817 : * Check consistency of arguments
818 : */
819 39800 : if (stmt->oncommit != ONCOMMIT_NOOP
820 128 : && stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
821 8 : ereport(ERROR,
822 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
823 : errmsg("ON COMMIT can only be used on temporary tables")));
824 :
825 39792 : if (stmt->partspec != NULL)
826 : {
827 3558 : if (relkind != RELKIND_RELATION)
828 0 : elog(ERROR, "unexpected relkind: %d", (int) relkind);
829 :
830 3558 : relkind = RELKIND_PARTITIONED_TABLE;
831 3558 : partitioned = true;
832 : }
833 : else
834 36234 : partitioned = false;
835 :
836 39792 : if (relkind == RELKIND_PARTITIONED_TABLE &&
837 3558 : stmt->relation->relpersistence == RELPERSISTENCE_UNLOGGED)
838 4 : ereport(ERROR,
839 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
840 : errmsg("partitioned tables cannot be unlogged")));
841 :
842 : /*
843 : * Look up the namespace in which we are supposed to create the relation,
844 : * check we have permission to create there, lock it against concurrent
845 : * drop, and mark stmt->relation as RELPERSISTENCE_TEMP if a temporary
846 : * namespace is selected.
847 : */
848 : namespaceId =
849 39788 : RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
850 :
851 : /*
852 : * Security check: disallow creating temp tables from security-restricted
853 : * code. This is needed because calling code might not expect untrusted
854 : * tables to appear in pg_temp at the front of its search path.
855 : */
856 39788 : if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
857 2294 : && InSecurityRestrictedOperation())
858 0 : ereport(ERROR,
859 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
860 : errmsg("cannot create temporary table within security-restricted operation")));
861 :
862 : /*
863 : * Determine the lockmode to use when scanning parents. A self-exclusive
864 : * lock is needed here.
865 : *
866 : * For regular inheritance, if two backends attempt to add children to the
867 : * same parent simultaneously, and that parent has no pre-existing
868 : * children, then both will attempt to update the parent's relhassubclass
869 : * field, leading to a "tuple concurrently updated" error. Also, this
870 : * interlocks against a concurrent ANALYZE on the parent table, which
871 : * might otherwise be attempting to clear the parent's relhassubclass
872 : * field, if its previous children were recently dropped.
873 : *
874 : * If the child table is a partition, then we instead grab an exclusive
875 : * lock on the parent because its partition descriptor will be changed by
876 : * addition of the new partition.
877 : */
878 39788 : parentLockmode = (stmt->partbound != NULL ? AccessExclusiveLock :
879 : ShareUpdateExclusiveLock);
880 :
881 : /* Determine the list of OIDs of the parents. */
882 39788 : inheritOids = NIL;
883 47560 : foreach(listptr, stmt->inhRelations)
884 : {
885 7772 : RangeVar *rv = (RangeVar *) lfirst(listptr);
886 : Oid parentOid;
887 :
888 7772 : parentOid = RangeVarGetRelid(rv, parentLockmode, false);
889 :
890 : /*
891 : * Reject duplications in the list of parents.
892 : */
893 7772 : if (list_member_oid(inheritOids, parentOid))
894 0 : ereport(ERROR,
895 : (errcode(ERRCODE_DUPLICATE_TABLE),
896 : errmsg("relation \"%s\" would be inherited from more than once",
897 : get_rel_name(parentOid))));
898 :
899 7772 : inheritOids = lappend_oid(inheritOids, parentOid);
900 : }
901 :
902 : /*
903 : * Select tablespace to use: an explicitly indicated one, or (in the case
904 : * of a partitioned table) the parent's, if it has one.
905 : */
906 39788 : if (stmt->tablespacename)
907 : {
908 85 : tablespaceId = get_tablespace_oid(stmt->tablespacename, false);
909 :
910 81 : if (partitioned && tablespaceId == MyDatabaseTableSpace)
911 4 : ereport(ERROR,
912 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
913 : errmsg("cannot specify default tablespace for partitioned relations")));
914 : }
915 39703 : else if (stmt->partbound)
916 : {
917 : Assert(list_length(inheritOids) == 1);
918 6135 : tablespaceId = get_rel_tablespace(linitial_oid(inheritOids));
919 : }
920 : else
921 33568 : tablespaceId = InvalidOid;
922 :
923 : /* still nothing? use the default */
924 39780 : if (!OidIsValid(tablespaceId))
925 39677 : tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence,
926 : partitioned);
927 :
928 : /* Check permissions except when using database's default */
929 39776 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
930 : {
931 : AclResult aclresult;
932 :
933 119 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(),
934 : ACL_CREATE);
935 119 : if (aclresult != ACLCHECK_OK)
936 4 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
937 4 : get_tablespace_name(tablespaceId));
938 : }
939 :
940 : /* In all cases disallow placing user relations in pg_global */
941 39772 : if (tablespaceId == GLOBALTABLESPACE_OID)
942 12 : ereport(ERROR,
943 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
944 : errmsg("only shared relations can be placed in pg_global tablespace")));
945 :
946 : /* Identify user ID that will own the table */
947 39760 : if (!OidIsValid(ownerId))
948 39605 : ownerId = GetUserId();
949 :
950 : /*
951 : * Parse and validate reloptions, if any.
952 : */
953 39760 : reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
954 : true, false);
955 :
956 39748 : switch (relkind)
957 : {
958 9640 : case RELKIND_VIEW:
959 9640 : (void) view_reloptions(reloptions, true);
960 9628 : break;
961 3542 : case RELKIND_PARTITIONED_TABLE:
962 3542 : (void) partitioned_table_reloptions(reloptions, true);
963 3538 : break;
964 26566 : default:
965 26566 : (void) heap_reloptions(relkind, reloptions, true);
966 : }
967 :
968 39668 : if (stmt->ofTypename)
969 : {
970 : AclResult aclresult;
971 :
972 57 : ofTypeId = typenameTypeId(NULL, stmt->ofTypename);
973 :
974 57 : aclresult = object_aclcheck(TypeRelationId, ofTypeId, GetUserId(), ACL_USAGE);
975 57 : if (aclresult != ACLCHECK_OK)
976 4 : aclcheck_error_type(aclresult, ofTypeId);
977 : }
978 : else
979 39611 : ofTypeId = InvalidOid;
980 :
981 : /*
982 : * Look up inheritance ancestors and generate relation schema, including
983 : * inherited attributes. (Note that stmt->tableElts is destructively
984 : * modified by MergeAttributes.)
985 : */
986 39504 : stmt->tableElts =
987 39664 : MergeAttributes(stmt->tableElts, inheritOids,
988 39664 : stmt->relation->relpersistence,
989 39664 : stmt->partbound != NULL,
990 : &old_constraints, &old_notnulls);
991 :
992 : /*
993 : * Create a tuple descriptor from the relation schema. Note that this
994 : * deals with column names, types, and in-descriptor NOT NULL flags, but
995 : * not default values, NOT NULL or CHECK constraints; we handle those
996 : * below.
997 : */
998 39504 : descriptor = BuildDescForRelation(stmt->tableElts);
999 :
1000 : /*
1001 : * Find columns with default values and prepare for insertion of the
1002 : * defaults. Pre-cooked (that is, inherited) defaults go into a list of
1003 : * CookedConstraint structs that we'll pass to heap_create_with_catalog,
1004 : * while raw defaults go into a list of RawColumnDefault structs that will
1005 : * be processed by AddRelationNewConstraints. (We can't deal with raw
1006 : * expressions until we can do transformExpr.)
1007 : */
1008 39472 : rawDefaults = NIL;
1009 39472 : cookedDefaults = NIL;
1010 39472 : attnum = 0;
1011 :
1012 192381 : foreach(listptr, stmt->tableElts)
1013 : {
1014 152909 : ColumnDef *colDef = lfirst(listptr);
1015 :
1016 152909 : attnum++;
1017 152909 : if (colDef->raw_default != NULL)
1018 : {
1019 : RawColumnDefault *rawEnt;
1020 :
1021 : Assert(colDef->cooked_default == NULL);
1022 :
1023 2120 : rawEnt = palloc_object(RawColumnDefault);
1024 2120 : rawEnt->attnum = attnum;
1025 2120 : rawEnt->raw_default = colDef->raw_default;
1026 2120 : rawEnt->generated = colDef->generated;
1027 2120 : rawDefaults = lappend(rawDefaults, rawEnt);
1028 : }
1029 150789 : else if (colDef->cooked_default != NULL)
1030 : {
1031 : CookedConstraint *cooked;
1032 :
1033 338 : cooked = palloc_object(CookedConstraint);
1034 338 : cooked->contype = CONSTR_DEFAULT;
1035 338 : cooked->conoid = InvalidOid; /* until created */
1036 338 : cooked->name = NULL;
1037 338 : cooked->attnum = attnum;
1038 338 : cooked->expr = colDef->cooked_default;
1039 338 : cooked->is_enforced = true;
1040 338 : cooked->skip_validation = false;
1041 338 : cooked->is_local = true; /* not used for defaults */
1042 338 : cooked->inhcount = 0; /* ditto */
1043 338 : cooked->is_no_inherit = false;
1044 338 : cookedDefaults = lappend(cookedDefaults, cooked);
1045 : }
1046 : }
1047 :
1048 39472 : TupleDescFinalize(descriptor);
1049 :
1050 : /*
1051 : * For relations with table AM and partitioned tables, select access
1052 : * method to use: an explicitly indicated one, or (in the case of a
1053 : * partitioned table) the parent's, if it has one.
1054 : */
1055 39472 : if (stmt->accessMethod != NULL)
1056 : {
1057 : Assert(RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE);
1058 87 : accessMethodId = get_table_am_oid(stmt->accessMethod, false);
1059 : }
1060 39385 : else if (RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE)
1061 : {
1062 25760 : if (stmt->partbound)
1063 : {
1064 : Assert(list_length(inheritOids) == 1);
1065 6021 : accessMethodId = get_rel_relam(linitial_oid(inheritOids));
1066 : }
1067 :
1068 25760 : if (RELKIND_HAS_TABLE_AM(relkind) && !OidIsValid(accessMethodId))
1069 22209 : accessMethodId = get_table_am_oid(default_table_access_method, false);
1070 : }
1071 :
1072 : /*
1073 : * Create the relation. Inherited defaults and CHECK constraints are
1074 : * passed in for immediate handling --- since they don't need parsing,
1075 : * they can be stored immediately.
1076 : */
1077 39460 : relationId = heap_create_with_catalog(relname,
1078 : namespaceId,
1079 : tablespaceId,
1080 : InvalidOid,
1081 : InvalidOid,
1082 : ofTypeId,
1083 : ownerId,
1084 : accessMethodId,
1085 : descriptor,
1086 : list_concat(cookedDefaults,
1087 : old_constraints),
1088 : relkind,
1089 39460 : stmt->relation->relpersistence,
1090 : false,
1091 : false,
1092 : stmt->oncommit,
1093 : reloptions,
1094 : true,
1095 : allowSystemTableMods,
1096 : false,
1097 : InvalidOid,
1098 : typaddress);
1099 :
1100 : /*
1101 : * We must bump the command counter to make the newly-created relation
1102 : * tuple visible for opening.
1103 : */
1104 39425 : CommandCounterIncrement();
1105 :
1106 : /*
1107 : * Open the new relation and acquire exclusive lock on it. This isn't
1108 : * really necessary for locking out other backends (since they can't see
1109 : * the new rel anyway until we commit), but it keeps the lock manager from
1110 : * complaining about deadlock risks.
1111 : */
1112 39425 : rel = relation_open(relationId, AccessExclusiveLock);
1113 :
1114 : /*
1115 : * Now add any newly specified column default and generation expressions
1116 : * to the new relation. These are passed to us in the form of raw
1117 : * parsetrees; we need to transform them to executable expression trees
1118 : * before they can be added. The most convenient way to do that is to
1119 : * apply the parser's transformExpr routine, but transformExpr doesn't
1120 : * work unless we have a pre-existing relation. So, the transformation has
1121 : * to be postponed to this final step of CREATE TABLE.
1122 : *
1123 : * This needs to be before processing the partitioning clauses because
1124 : * those could refer to generated columns.
1125 : */
1126 39425 : if (rawDefaults)
1127 1790 : AddRelationNewConstraints(rel, rawDefaults, NIL,
1128 : true, true, false, queryString);
1129 :
1130 : /*
1131 : * Make column generation expressions visible for use by partitioning.
1132 : */
1133 39297 : CommandCounterIncrement();
1134 :
1135 : /* Process and store partition bound, if any. */
1136 39297 : if (stmt->partbound)
1137 : {
1138 : PartitionBoundSpec *bound;
1139 : ParseState *pstate;
1140 6083 : Oid parentId = linitial_oid(inheritOids),
1141 : defaultPartOid;
1142 : Relation parent,
1143 6083 : defaultRel = NULL;
1144 : ParseNamespaceItem *nsitem;
1145 :
1146 : /* Already have strong enough lock on the parent */
1147 6083 : parent = table_open(parentId, NoLock);
1148 :
1149 : /*
1150 : * We are going to try to validate the partition bound specification
1151 : * against the partition key of parentRel, so it better have one.
1152 : */
1153 6083 : if (parent->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1154 12 : ereport(ERROR,
1155 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1156 : errmsg("\"%s\" is not partitioned",
1157 : RelationGetRelationName(parent))));
1158 :
1159 : /*
1160 : * The partition constraint of the default partition depends on the
1161 : * partition bounds of every other partition. It is possible that
1162 : * another backend might be about to execute a query on the default
1163 : * partition table, and that the query relies on previously cached
1164 : * default partition constraints. We must therefore take a table lock
1165 : * strong enough to prevent all queries on the default partition from
1166 : * proceeding until we commit and send out a shared-cache-inval notice
1167 : * that will make them update their index lists.
1168 : *
1169 : * Order of locking: The relation being added won't be visible to
1170 : * other backends until it is committed, hence here in
1171 : * DefineRelation() the order of locking the default partition and the
1172 : * relation being added does not matter. But at all other places we
1173 : * need to lock the default relation before we lock the relation being
1174 : * added or removed i.e. we should take the lock in same order at all
1175 : * the places such that lock parent, lock default partition and then
1176 : * lock the partition so as to avoid a deadlock.
1177 : */
1178 : defaultPartOid =
1179 6071 : get_default_oid_from_partdesc(RelationGetPartitionDesc(parent,
1180 : true));
1181 6071 : if (OidIsValid(defaultPartOid))
1182 251 : defaultRel = table_open(defaultPartOid, AccessExclusiveLock);
1183 :
1184 : /* Transform the bound values */
1185 6071 : pstate = make_parsestate(NULL);
1186 6071 : pstate->p_sourcetext = queryString;
1187 :
1188 : /*
1189 : * Add an nsitem containing this relation, so that transformExpr
1190 : * called on partition bound expressions is able to report errors
1191 : * using a proper context.
1192 : */
1193 6071 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
1194 : NULL, false, false);
1195 6071 : addNSItemToQuery(pstate, nsitem, false, true, true);
1196 :
1197 6071 : bound = transformPartitionBound(pstate, parent, stmt->partbound);
1198 :
1199 : /*
1200 : * Check first that the new partition's bound is valid and does not
1201 : * overlap with any of existing partitions of the parent.
1202 : */
1203 5935 : check_new_partition_bound(relname, parent, bound, pstate);
1204 :
1205 : /*
1206 : * If the default partition exists, its partition constraints will
1207 : * change after the addition of this new partition such that it won't
1208 : * allow any row that qualifies for this new partition. So, check that
1209 : * the existing data in the default partition satisfies the constraint
1210 : * as it will exist after adding this partition.
1211 : */
1212 5859 : if (OidIsValid(defaultPartOid))
1213 : {
1214 231 : check_default_partition_contents(parent, defaultRel, bound);
1215 : /* Keep the lock until commit. */
1216 219 : table_close(defaultRel, NoLock);
1217 : }
1218 :
1219 : /* Update the pg_class entry. */
1220 5847 : StorePartitionBound(rel, parent, bound);
1221 :
1222 5847 : table_close(parent, NoLock);
1223 : }
1224 :
1225 : /* Store inheritance information for new rel. */
1226 39061 : StoreCatalogInheritance(relationId, inheritOids, stmt->partbound != NULL);
1227 :
1228 : /*
1229 : * Process the partitioning specification (if any) and store the partition
1230 : * key information into the catalog.
1231 : */
1232 39061 : if (partitioned)
1233 : {
1234 : ParseState *pstate;
1235 : int partnatts;
1236 : AttrNumber partattrs[PARTITION_MAX_KEYS];
1237 : Oid partopclass[PARTITION_MAX_KEYS];
1238 : Oid partcollation[PARTITION_MAX_KEYS];
1239 3538 : List *partexprs = NIL;
1240 :
1241 3538 : pstate = make_parsestate(NULL);
1242 3538 : pstate->p_sourcetext = queryString;
1243 :
1244 3538 : partnatts = list_length(stmt->partspec->partParams);
1245 :
1246 : /* Protect fixed-size arrays here and in executor */
1247 3538 : if (partnatts > PARTITION_MAX_KEYS)
1248 0 : ereport(ERROR,
1249 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
1250 : errmsg("cannot partition using more than %d columns",
1251 : PARTITION_MAX_KEYS)));
1252 :
1253 : /*
1254 : * We need to transform the raw parsetrees corresponding to partition
1255 : * expressions into executable expression trees. Like column defaults
1256 : * and CHECK constraints, we could not have done the transformation
1257 : * earlier.
1258 : */
1259 3538 : stmt->partspec = transformPartitionSpec(rel, stmt->partspec);
1260 :
1261 3518 : ComputePartitionAttrs(pstate, rel, stmt->partspec->partParams,
1262 : partattrs, &partexprs, partopclass,
1263 3518 : partcollation, stmt->partspec->strategy);
1264 :
1265 3430 : StorePartitionKey(rel, stmt->partspec->strategy, partnatts, partattrs,
1266 : partexprs,
1267 : partopclass, partcollation);
1268 :
1269 : /* make it all visible */
1270 3430 : CommandCounterIncrement();
1271 : }
1272 :
1273 : /*
1274 : * If we're creating a partition, create now all the indexes, triggers,
1275 : * FKs defined in the parent.
1276 : *
1277 : * We can't do it earlier, because DefineIndex wants to know the partition
1278 : * key which we just stored.
1279 : */
1280 38953 : if (stmt->partbound)
1281 : {
1282 5843 : Oid parentId = linitial_oid(inheritOids);
1283 : Relation parent;
1284 : List *idxlist;
1285 : ListCell *cell;
1286 :
1287 : /* Already have strong enough lock on the parent */
1288 5843 : parent = table_open(parentId, NoLock);
1289 5843 : idxlist = RelationGetIndexList(parent);
1290 :
1291 : /*
1292 : * For each index in the parent table, create one in the partition
1293 : */
1294 6916 : foreach(cell, idxlist)
1295 : {
1296 1085 : Relation idxRel = index_open(lfirst_oid(cell), AccessShareLock);
1297 : AttrMap *attmap;
1298 : IndexStmt *idxstmt;
1299 : Oid constraintOid;
1300 :
1301 1085 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
1302 : {
1303 24 : if (idxRel->rd_index->indisunique)
1304 8 : ereport(ERROR,
1305 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1306 : errmsg("cannot create foreign partition of partitioned table \"%s\"",
1307 : RelationGetRelationName(parent)),
1308 : errdetail("Table \"%s\" contains indexes that are unique.",
1309 : RelationGetRelationName(parent))));
1310 : else
1311 : {
1312 16 : index_close(idxRel, AccessShareLock);
1313 16 : continue;
1314 : }
1315 : }
1316 :
1317 1061 : attmap = build_attrmap_by_name(RelationGetDescr(rel),
1318 : RelationGetDescr(parent),
1319 : false);
1320 : idxstmt =
1321 1061 : generateClonedIndexStmt(NULL, idxRel,
1322 : attmap, &constraintOid);
1323 1061 : DefineIndex(NULL,
1324 : RelationGetRelid(rel),
1325 : idxstmt,
1326 : InvalidOid,
1327 : RelationGetRelid(idxRel),
1328 : constraintOid,
1329 : -1,
1330 : false, false, false, false, false);
1331 :
1332 1057 : index_close(idxRel, AccessShareLock);
1333 : }
1334 :
1335 5831 : list_free(idxlist);
1336 :
1337 : /*
1338 : * If there are any row-level triggers, clone them to the new
1339 : * partition.
1340 : */
1341 5831 : if (parent->trigdesc != NULL)
1342 316 : CloneRowTriggersToPartition(parent, rel);
1343 :
1344 : /*
1345 : * And foreign keys too. Note that because we're freshly creating the
1346 : * table, there is no need to verify these new constraints.
1347 : */
1348 5831 : CloneForeignKeyConstraints(NULL, parent, rel);
1349 :
1350 5831 : table_close(parent, NoLock);
1351 : }
1352 :
1353 : /*
1354 : * Now add any newly specified CHECK constraints to the new relation. Same
1355 : * as for defaults above, but these need to come after partitioning is set
1356 : * up. We save the constraint names that were used, to avoid dupes below.
1357 : */
1358 38941 : if (stmt->constraints)
1359 : {
1360 : List *conlist;
1361 :
1362 498 : conlist = AddRelationNewConstraints(rel, NIL, stmt->constraints,
1363 : true, true, false, queryString);
1364 1509 : foreach_ptr(CookedConstraint, cons, conlist)
1365 : {
1366 553 : if (cons->name != NULL)
1367 553 : connames = lappend(connames, cons->name);
1368 : }
1369 : }
1370 :
1371 : /*
1372 : * Finally, merge the not-null constraints that are declared directly with
1373 : * those that come from parent relations (making sure to count inheritance
1374 : * appropriately for each), create them, and set the attnotnull flag on
1375 : * columns that don't yet have it.
1376 : */
1377 38921 : nncols = AddRelationNotNullConstraints(rel, stmt->nnconstraints,
1378 : old_notnulls, connames);
1379 87281 : foreach_int(attrnum, nncols)
1380 9543 : set_attnotnull(NULL, rel, attrnum, true, false);
1381 :
1382 38869 : ObjectAddressSet(address, RelationRelationId, relationId);
1383 :
1384 : /*
1385 : * Clean up. We keep lock on new relation (although it shouldn't be
1386 : * visible to anyone else anyway, until commit).
1387 : */
1388 38869 : relation_close(rel, NoLock);
1389 :
1390 38869 : return address;
1391 : }
1392 :
1393 : /*
1394 : * BuildDescForRelation
1395 : *
1396 : * Given a list of ColumnDef nodes, build a TupleDesc.
1397 : *
1398 : * Note: This is only for the limited purpose of table and view creation. Not
1399 : * everything is filled in. A real tuple descriptor should be obtained from
1400 : * the relcache.
1401 : */
1402 : TupleDesc
1403 42036 : BuildDescForRelation(const List *columns)
1404 : {
1405 : int natts;
1406 : AttrNumber attnum;
1407 : ListCell *l;
1408 : TupleDesc desc;
1409 : char *attname;
1410 : Oid atttypid;
1411 : int32 atttypmod;
1412 : Oid attcollation;
1413 : int attdim;
1414 :
1415 : /*
1416 : * allocate a new tuple descriptor
1417 : */
1418 42036 : natts = list_length(columns);
1419 42036 : desc = CreateTemplateTupleDesc(natts);
1420 :
1421 42036 : attnum = 0;
1422 :
1423 198402 : foreach(l, columns)
1424 : {
1425 156406 : ColumnDef *entry = lfirst(l);
1426 : AclResult aclresult;
1427 : Form_pg_attribute att;
1428 :
1429 : /*
1430 : * for each entry in the list, get the name and type information from
1431 : * the list and have TupleDescInitEntry fill in the attribute
1432 : * information we need.
1433 : */
1434 156406 : attnum++;
1435 :
1436 156406 : attname = entry->colname;
1437 156406 : typenameTypeIdAndMod(NULL, entry->typeName, &atttypid, &atttypmod);
1438 :
1439 156406 : aclresult = object_aclcheck(TypeRelationId, atttypid, GetUserId(), ACL_USAGE);
1440 156406 : if (aclresult != ACLCHECK_OK)
1441 28 : aclcheck_error_type(aclresult, atttypid);
1442 :
1443 156378 : attcollation = GetColumnDefCollation(NULL, entry, atttypid);
1444 156378 : attdim = list_length(entry->typeName->arrayBounds);
1445 156378 : if (attdim > PG_INT16_MAX)
1446 0 : ereport(ERROR,
1447 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1448 : errmsg("too many array dimensions"));
1449 :
1450 156378 : if (entry->typeName->setof)
1451 0 : ereport(ERROR,
1452 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1453 : errmsg("column \"%s\" cannot be declared SETOF",
1454 : attname)));
1455 :
1456 156378 : TupleDescInitEntry(desc, attnum, attname,
1457 : atttypid, atttypmod, attdim);
1458 156378 : att = TupleDescAttr(desc, attnum - 1);
1459 :
1460 : /* Override TupleDescInitEntry's settings as requested */
1461 156378 : TupleDescInitEntryCollation(desc, attnum, attcollation);
1462 :
1463 : /* Fill in additional stuff not handled by TupleDescInitEntry */
1464 156378 : att->attnotnull = entry->is_not_null;
1465 156378 : att->attislocal = entry->is_local;
1466 156378 : att->attinhcount = entry->inhcount;
1467 156378 : att->attidentity = entry->identity;
1468 156378 : att->attgenerated = entry->generated;
1469 156378 : att->attcompression = GetAttributeCompression(att->atttypid, entry->compression);
1470 156370 : if (entry->storage)
1471 16265 : att->attstorage = entry->storage;
1472 140105 : else if (entry->storage_name)
1473 39 : att->attstorage = GetAttributeStorage(att->atttypid, entry->storage_name);
1474 :
1475 156366 : populate_compact_attribute(desc, attnum - 1);
1476 : }
1477 :
1478 41996 : TupleDescFinalize(desc);
1479 :
1480 41996 : return desc;
1481 : }
1482 :
1483 : /*
1484 : * Emit the right error or warning message for a "DROP" command issued on a
1485 : * non-existent relation
1486 : */
1487 : static void
1488 625 : DropErrorMsgNonExistent(RangeVar *rel, char rightkind, bool missing_ok)
1489 : {
1490 : const struct dropmsgstrings *rentry;
1491 :
1492 705 : if (rel->schemaname != NULL &&
1493 80 : !OidIsValid(LookupNamespaceNoError(rel->schemaname)))
1494 : {
1495 28 : if (!missing_ok)
1496 : {
1497 0 : ereport(ERROR,
1498 : (errcode(ERRCODE_UNDEFINED_SCHEMA),
1499 : errmsg("schema \"%s\" does not exist", rel->schemaname)));
1500 : }
1501 : else
1502 : {
1503 28 : ereport(NOTICE,
1504 : (errmsg("schema \"%s\" does not exist, skipping",
1505 : rel->schemaname)));
1506 : }
1507 28 : return;
1508 : }
1509 :
1510 882 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1511 : {
1512 882 : if (rentry->kind == rightkind)
1513 : {
1514 597 : if (!missing_ok)
1515 : {
1516 90 : ereport(ERROR,
1517 : (errcode(rentry->nonexistent_code),
1518 : errmsg(rentry->nonexistent_msg, rel->relname)));
1519 : }
1520 : else
1521 : {
1522 507 : ereport(NOTICE, (errmsg(rentry->skipping_msg, rel->relname)));
1523 507 : break;
1524 : }
1525 : }
1526 : }
1527 :
1528 : Assert(rentry->kind != '\0'); /* Should be impossible */
1529 : }
1530 :
1531 : /*
1532 : * Emit the right error message for a "DROP" command issued on a
1533 : * relation of the wrong type
1534 : */
1535 : static void
1536 4 : DropErrorMsgWrongType(const char *relname, char wrongkind, char rightkind)
1537 : {
1538 : const struct dropmsgstrings *rentry;
1539 : const struct dropmsgstrings *wentry;
1540 :
1541 4 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1542 4 : if (rentry->kind == rightkind)
1543 4 : break;
1544 : Assert(rentry->kind != '\0');
1545 :
1546 40 : for (wentry = dropmsgstringarray; wentry->kind != '\0'; wentry++)
1547 40 : if (wentry->kind == wrongkind)
1548 4 : break;
1549 : /* wrongkind could be something we don't have in our table... */
1550 :
1551 4 : ereport(ERROR,
1552 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1553 : errmsg(rentry->nota_msg, relname),
1554 : (wentry->kind != '\0') ? errhint("%s", _(wentry->drophint_msg)) : 0));
1555 : }
1556 :
1557 : /*
1558 : * RemoveRelations
1559 : * Implements DROP TABLE, DROP INDEX, DROP SEQUENCE, DROP VIEW,
1560 : * DROP MATERIALIZED VIEW, DROP FOREIGN TABLE, DROP PROPERTY GRAPH
1561 : */
1562 : void
1563 11235 : RemoveRelations(DropStmt *drop)
1564 : {
1565 : ObjectAddresses *objects;
1566 : char relkind;
1567 : ListCell *cell;
1568 11235 : int flags = 0;
1569 11235 : LOCKMODE lockmode = AccessExclusiveLock;
1570 :
1571 : /* DROP CONCURRENTLY uses a weaker lock, and has some restrictions */
1572 11235 : if (drop->concurrent)
1573 : {
1574 : /*
1575 : * Note that for temporary relations this lock may get upgraded later
1576 : * on, but as no other session can access a temporary relation, this
1577 : * is actually fine.
1578 : */
1579 107 : lockmode = ShareUpdateExclusiveLock;
1580 : Assert(drop->removeType == OBJECT_INDEX);
1581 107 : if (list_length(drop->objects) != 1)
1582 4 : ereport(ERROR,
1583 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1584 : errmsg("DROP INDEX CONCURRENTLY does not support dropping multiple objects")));
1585 103 : if (drop->behavior == DROP_CASCADE)
1586 0 : ereport(ERROR,
1587 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1588 : errmsg("DROP INDEX CONCURRENTLY does not support CASCADE")));
1589 : }
1590 :
1591 : /*
1592 : * First we identify all the relations, then we delete them in a single
1593 : * performMultipleDeletions() call. This is to avoid unwanted DROP
1594 : * RESTRICT errors if one of the relations depends on another.
1595 : */
1596 :
1597 : /* Determine required relkind */
1598 11231 : switch (drop->removeType)
1599 : {
1600 9687 : case OBJECT_TABLE:
1601 9687 : relkind = RELKIND_RELATION;
1602 9687 : break;
1603 :
1604 553 : case OBJECT_INDEX:
1605 553 : relkind = RELKIND_INDEX;
1606 553 : break;
1607 :
1608 119 : case OBJECT_SEQUENCE:
1609 119 : relkind = RELKIND_SEQUENCE;
1610 119 : break;
1611 :
1612 647 : case OBJECT_VIEW:
1613 647 : relkind = RELKIND_VIEW;
1614 647 : break;
1615 :
1616 79 : case OBJECT_MATVIEW:
1617 79 : relkind = RELKIND_MATVIEW;
1618 79 : break;
1619 :
1620 100 : case OBJECT_FOREIGN_TABLE:
1621 100 : relkind = RELKIND_FOREIGN_TABLE;
1622 100 : break;
1623 :
1624 46 : case OBJECT_PROPGRAPH:
1625 46 : relkind = RELKIND_PROPGRAPH;
1626 46 : break;
1627 :
1628 0 : default:
1629 0 : elog(ERROR, "unrecognized drop object type: %d",
1630 : (int) drop->removeType);
1631 : relkind = 0; /* keep compiler quiet */
1632 : break;
1633 : }
1634 :
1635 : /* Lock and validate each relation; build a list of object addresses */
1636 11231 : objects = new_object_addresses();
1637 :
1638 24776 : foreach(cell, drop->objects)
1639 : {
1640 13656 : RangeVar *rel = makeRangeVarFromNameList((List *) lfirst(cell));
1641 : Oid relOid;
1642 : ObjectAddress obj;
1643 : struct DropRelationCallbackState state;
1644 :
1645 : /*
1646 : * These next few steps are a great deal like relation_openrv, but we
1647 : * don't bother building a relcache entry since we don't need it.
1648 : *
1649 : * Check for shared-cache-inval messages before trying to access the
1650 : * relation. This is needed to cover the case where the name
1651 : * identifies a rel that has been dropped and recreated since the
1652 : * start of our transaction: if we don't flush the old syscache entry,
1653 : * then we'll latch onto that entry and suffer an error later.
1654 : */
1655 13656 : AcceptInvalidationMessages();
1656 :
1657 : /* Look up the appropriate relation using namespace search. */
1658 13656 : state.expected_relkind = relkind;
1659 27312 : state.heap_lockmode = drop->concurrent ?
1660 13656 : ShareUpdateExclusiveLock : AccessExclusiveLock;
1661 : /* We must initialize these fields to show that no locks are held: */
1662 13656 : state.heapOid = InvalidOid;
1663 13656 : state.partParentOid = InvalidOid;
1664 :
1665 13656 : relOid = RangeVarGetRelidExtended(rel, lockmode, RVR_MISSING_OK,
1666 : RangeVarCallbackForDropRelation,
1667 : &state);
1668 :
1669 : /* Not there? */
1670 13639 : if (!OidIsValid(relOid))
1671 : {
1672 625 : DropErrorMsgNonExistent(rel, relkind, drop->missing_ok);
1673 535 : continue;
1674 : }
1675 :
1676 : /*
1677 : * Decide if concurrent mode needs to be used here or not. The
1678 : * callback retrieved the rel's persistence for us.
1679 : */
1680 13014 : if (drop->concurrent &&
1681 99 : state.actual_relpersistence != RELPERSISTENCE_TEMP)
1682 : {
1683 : Assert(list_length(drop->objects) == 1 &&
1684 : drop->removeType == OBJECT_INDEX);
1685 87 : flags |= PERFORM_DELETION_CONCURRENTLY;
1686 : }
1687 :
1688 : /*
1689 : * Concurrent index drop cannot be used with partitioned indexes,
1690 : * either.
1691 : */
1692 13014 : if ((flags & PERFORM_DELETION_CONCURRENTLY) != 0 &&
1693 87 : state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1694 4 : ereport(ERROR,
1695 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1696 : errmsg("cannot drop partitioned index \"%s\" concurrently",
1697 : rel->relname)));
1698 :
1699 : /*
1700 : * If we're told to drop a partitioned index, we must acquire lock on
1701 : * all the children of its parent partitioned table before proceeding.
1702 : * Otherwise we'd try to lock the child index partitions before their
1703 : * tables, leading to potential deadlock against other sessions that
1704 : * will lock those objects in the other order.
1705 : */
1706 13010 : if (state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1707 50 : (void) find_all_inheritors(state.heapOid,
1708 : state.heap_lockmode,
1709 : NULL);
1710 :
1711 : /* OK, we're ready to delete this one */
1712 13010 : obj.classId = RelationRelationId;
1713 13010 : obj.objectId = relOid;
1714 13010 : obj.objectSubId = 0;
1715 :
1716 13010 : add_exact_object_address(&obj, objects);
1717 : }
1718 :
1719 11120 : performMultipleDeletions(objects, drop->behavior, flags);
1720 :
1721 11018 : free_object_addresses(objects);
1722 11018 : }
1723 :
1724 : /*
1725 : * Before acquiring a table lock, check whether we have sufficient rights.
1726 : * In the case of DROP INDEX, also try to lock the table before the index.
1727 : * Also, if the table to be dropped is a partition, we try to lock the parent
1728 : * first.
1729 : */
1730 : static void
1731 13872 : RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid, Oid oldRelOid,
1732 : void *arg)
1733 : {
1734 : HeapTuple tuple;
1735 : struct DropRelationCallbackState *state;
1736 : char expected_relkind;
1737 : bool is_partition;
1738 : Form_pg_class classform;
1739 : LOCKMODE heap_lockmode;
1740 13872 : bool invalid_system_index = false;
1741 :
1742 13872 : state = (struct DropRelationCallbackState *) arg;
1743 13872 : heap_lockmode = state->heap_lockmode;
1744 :
1745 : /*
1746 : * If we previously locked some other index's heap, and the name we're
1747 : * looking up no longer refers to that relation, release the now-useless
1748 : * lock.
1749 : */
1750 13872 : if (relOid != oldRelOid && OidIsValid(state->heapOid))
1751 : {
1752 0 : UnlockRelationOid(state->heapOid, heap_lockmode);
1753 0 : state->heapOid = InvalidOid;
1754 : }
1755 :
1756 : /*
1757 : * Similarly, if we previously locked some other partition's heap, and the
1758 : * name we're looking up no longer refers to that relation, release the
1759 : * now-useless lock.
1760 : */
1761 13872 : if (relOid != oldRelOid && OidIsValid(state->partParentOid))
1762 : {
1763 0 : UnlockRelationOid(state->partParentOid, AccessExclusiveLock);
1764 0 : state->partParentOid = InvalidOid;
1765 : }
1766 :
1767 : /* Didn't find a relation, so no need for locking or permission checks. */
1768 13872 : if (!OidIsValid(relOid))
1769 627 : return;
1770 :
1771 13245 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
1772 13245 : if (!HeapTupleIsValid(tuple))
1773 0 : return; /* concurrently dropped, so nothing to do */
1774 13245 : classform = (Form_pg_class) GETSTRUCT(tuple);
1775 13245 : is_partition = classform->relispartition;
1776 :
1777 : /* Pass back some data to save lookups in RemoveRelations */
1778 13245 : state->actual_relkind = classform->relkind;
1779 13245 : state->actual_relpersistence = classform->relpersistence;
1780 :
1781 : /*
1782 : * Both RELKIND_RELATION and RELKIND_PARTITIONED_TABLE are OBJECT_TABLE,
1783 : * but RemoveRelations() can only pass one relkind for a given relation.
1784 : * It chooses RELKIND_RELATION for both regular and partitioned tables.
1785 : * That means we must be careful before giving the wrong type error when
1786 : * the relation is RELKIND_PARTITIONED_TABLE. An equivalent problem
1787 : * exists with indexes.
1788 : */
1789 13245 : if (classform->relkind == RELKIND_PARTITIONED_TABLE)
1790 2167 : expected_relkind = RELKIND_RELATION;
1791 11078 : else if (classform->relkind == RELKIND_PARTITIONED_INDEX)
1792 55 : expected_relkind = RELKIND_INDEX;
1793 : else
1794 11023 : expected_relkind = classform->relkind;
1795 :
1796 13245 : if (state->expected_relkind != expected_relkind)
1797 4 : DropErrorMsgWrongType(rel->relname, classform->relkind,
1798 4 : state->expected_relkind);
1799 :
1800 : /* Allow DROP to either table owner or schema owner */
1801 13241 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()) &&
1802 12 : !object_ownercheck(NamespaceRelationId, classform->relnamespace, GetUserId()))
1803 12 : aclcheck_error(ACLCHECK_NOT_OWNER,
1804 12 : get_relkind_objtype(classform->relkind),
1805 12 : rel->relname);
1806 :
1807 : /*
1808 : * Check the case of a system index that might have been invalidated by a
1809 : * failed concurrent process and allow its drop. For the time being, this
1810 : * only concerns indexes of toast relations that became invalid during a
1811 : * REINDEX CONCURRENTLY process.
1812 : */
1813 13229 : if (IsSystemClass(relOid, classform) && classform->relkind == RELKIND_INDEX)
1814 : {
1815 : HeapTuple locTuple;
1816 : Form_pg_index indexform;
1817 : bool indisvalid;
1818 :
1819 0 : locTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(relOid));
1820 0 : if (!HeapTupleIsValid(locTuple))
1821 : {
1822 0 : ReleaseSysCache(tuple);
1823 0 : return;
1824 : }
1825 :
1826 0 : indexform = (Form_pg_index) GETSTRUCT(locTuple);
1827 0 : indisvalid = indexform->indisvalid;
1828 0 : ReleaseSysCache(locTuple);
1829 :
1830 : /* Mark object as being an invalid index of system catalogs */
1831 0 : if (!indisvalid)
1832 0 : invalid_system_index = true;
1833 : }
1834 :
1835 : /* In the case of an invalid index, it is fine to bypass this check */
1836 13229 : if (!invalid_system_index && !allowSystemTableMods && IsSystemClass(relOid, classform))
1837 1 : ereport(ERROR,
1838 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1839 : errmsg("permission denied: \"%s\" is a system catalog",
1840 : rel->relname)));
1841 :
1842 13228 : ReleaseSysCache(tuple);
1843 :
1844 : /*
1845 : * In DROP INDEX, attempt to acquire lock on the parent table before
1846 : * locking the index. index_drop() will need this anyway, and since
1847 : * regular queries lock tables before their indexes, we risk deadlock if
1848 : * we do it the other way around. No error if we don't find a pg_index
1849 : * entry, though --- the relation may have been dropped. Note that this
1850 : * code will execute for either plain or partitioned indexes.
1851 : */
1852 13228 : if (expected_relkind == RELKIND_INDEX &&
1853 : relOid != oldRelOid)
1854 : {
1855 545 : state->heapOid = IndexGetRelation(relOid, true);
1856 545 : if (OidIsValid(state->heapOid))
1857 545 : LockRelationOid(state->heapOid, heap_lockmode);
1858 : }
1859 :
1860 : /*
1861 : * Similarly, if the relation is a partition, we must acquire lock on its
1862 : * parent before locking the partition. That's because queries lock the
1863 : * parent before its partitions, so we risk deadlock if we do it the other
1864 : * way around.
1865 : */
1866 13228 : if (is_partition && relOid != oldRelOid)
1867 : {
1868 393 : state->partParentOid = get_partition_parent(relOid, true);
1869 393 : if (OidIsValid(state->partParentOid))
1870 393 : LockRelationOid(state->partParentOid, AccessExclusiveLock);
1871 : }
1872 : }
1873 :
1874 : /*
1875 : * ExecuteTruncate
1876 : * Executes a TRUNCATE command.
1877 : *
1878 : * This is a multi-relation truncate. We first open and grab exclusive
1879 : * lock on all relations involved, checking permissions and otherwise
1880 : * verifying that the relation is OK for truncation. Note that if relations
1881 : * are foreign tables, at this stage, we have not yet checked that their
1882 : * foreign data in external data sources are OK for truncation. These are
1883 : * checked when foreign data are actually truncated later. In CASCADE mode,
1884 : * relations having FK references to the targeted relations are automatically
1885 : * added to the group; in RESTRICT mode, we check that all FK references are
1886 : * internal to the group that's being truncated. Finally all the relations
1887 : * are truncated and reindexed.
1888 : */
1889 : void
1890 1140 : ExecuteTruncate(TruncateStmt *stmt)
1891 : {
1892 1140 : List *rels = NIL;
1893 1140 : List *relids = NIL;
1894 1140 : List *relids_logged = NIL;
1895 : ListCell *cell;
1896 :
1897 : /*
1898 : * Open, exclusive-lock, and check all the explicitly-specified relations
1899 : */
1900 2417 : foreach(cell, stmt->relations)
1901 : {
1902 1312 : RangeVar *rv = lfirst(cell);
1903 : Relation rel;
1904 1312 : bool recurse = rv->inh;
1905 : Oid myrelid;
1906 1312 : LOCKMODE lockmode = AccessExclusiveLock;
1907 :
1908 1312 : myrelid = RangeVarGetRelidExtended(rv, lockmode,
1909 : 0, RangeVarCallbackForTruncate,
1910 : NULL);
1911 :
1912 : /* don't throw error for "TRUNCATE foo, foo" */
1913 1289 : if (list_member_oid(relids, myrelid))
1914 1 : continue;
1915 :
1916 : /* open the relation, we already hold a lock on it */
1917 1288 : rel = table_open(myrelid, NoLock);
1918 :
1919 : /*
1920 : * RangeVarGetRelidExtended() has done most checks with its callback,
1921 : * but other checks with the now-opened Relation remain.
1922 : */
1923 1288 : truncate_check_activity(rel);
1924 :
1925 1284 : rels = lappend(rels, rel);
1926 1284 : relids = lappend_oid(relids, myrelid);
1927 :
1928 : /* Log this relation only if needed for logical decoding */
1929 1284 : if (RelationIsLogicallyLogged(rel))
1930 39 : relids_logged = lappend_oid(relids_logged, myrelid);
1931 :
1932 1284 : if (recurse)
1933 : {
1934 : ListCell *child;
1935 : List *children;
1936 :
1937 1247 : children = find_all_inheritors(myrelid, lockmode, NULL);
1938 :
1939 3714 : foreach(child, children)
1940 : {
1941 2467 : Oid childrelid = lfirst_oid(child);
1942 :
1943 2467 : if (list_member_oid(relids, childrelid))
1944 1247 : continue;
1945 :
1946 : /* find_all_inheritors already got lock */
1947 1220 : rel = table_open(childrelid, NoLock);
1948 :
1949 : /*
1950 : * It is possible that the parent table has children that are
1951 : * temp tables of other backends. We cannot safely access
1952 : * such tables (because of buffering issues), and the best
1953 : * thing to do is to silently ignore them. Note that this
1954 : * check is the same as one of the checks done in
1955 : * truncate_check_activity() called below, still it is kept
1956 : * here for simplicity.
1957 : */
1958 1220 : if (RELATION_IS_OTHER_TEMP(rel))
1959 : {
1960 4 : table_close(rel, lockmode);
1961 4 : continue;
1962 : }
1963 :
1964 : /*
1965 : * Inherited TRUNCATE commands perform access permission
1966 : * checks on the parent table only. So we skip checking the
1967 : * children's permissions and don't call
1968 : * truncate_check_perms() here.
1969 : */
1970 1216 : truncate_check_rel(RelationGetRelid(rel), rel->rd_rel);
1971 1216 : truncate_check_activity(rel);
1972 :
1973 1216 : rels = lappend(rels, rel);
1974 1216 : relids = lappend_oid(relids, childrelid);
1975 :
1976 : /* Log this relation only if needed for logical decoding */
1977 1216 : if (RelationIsLogicallyLogged(rel))
1978 11 : relids_logged = lappend_oid(relids_logged, childrelid);
1979 : }
1980 : }
1981 37 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1982 8 : ereport(ERROR,
1983 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1984 : errmsg("cannot truncate only a partitioned table"),
1985 : errhint("Do not specify the ONLY keyword, or use TRUNCATE ONLY on the partitions directly.")));
1986 : }
1987 :
1988 1105 : ExecuteTruncateGuts(rels, relids, relids_logged,
1989 1105 : stmt->behavior, stmt->restart_seqs, false);
1990 :
1991 : /* And close the rels */
1992 3443 : foreach(cell, rels)
1993 : {
1994 2391 : Relation rel = (Relation) lfirst(cell);
1995 :
1996 2391 : table_close(rel, NoLock);
1997 : }
1998 1052 : }
1999 :
2000 : /*
2001 : * ExecuteTruncateGuts
2002 : *
2003 : * Internal implementation of TRUNCATE. This is called by the actual TRUNCATE
2004 : * command (see above) as well as replication subscribers that execute a
2005 : * replicated TRUNCATE action.
2006 : *
2007 : * explicit_rels is the list of Relations to truncate that the command
2008 : * specified. relids is the list of Oids corresponding to explicit_rels.
2009 : * relids_logged is the list of Oids (a subset of relids) that require
2010 : * WAL-logging. This is all a bit redundant, but the existing callers have
2011 : * this information handy in this form.
2012 : */
2013 : void
2014 1125 : ExecuteTruncateGuts(List *explicit_rels,
2015 : List *relids,
2016 : List *relids_logged,
2017 : DropBehavior behavior, bool restart_seqs,
2018 : bool run_as_table_owner)
2019 : {
2020 : List *rels;
2021 1125 : List *seq_relids = NIL;
2022 1125 : HTAB *ft_htab = NULL;
2023 : EState *estate;
2024 : ResultRelInfo *resultRelInfos;
2025 : ResultRelInfo *resultRelInfo;
2026 : SubTransactionId mySubid;
2027 : ListCell *cell;
2028 : Oid *logrelids;
2029 :
2030 : /*
2031 : * Check the explicitly-specified relations.
2032 : *
2033 : * In CASCADE mode, suck in all referencing relations as well. This
2034 : * requires multiple iterations to find indirectly-dependent relations. At
2035 : * each phase, we need to exclusive-lock new rels before looking for their
2036 : * dependencies, else we might miss something. Also, we check each rel as
2037 : * soon as we open it, to avoid a faux pas such as holding lock for a long
2038 : * time on a rel we have no permissions for.
2039 : */
2040 1125 : rels = list_copy(explicit_rels);
2041 1125 : if (behavior == DROP_CASCADE)
2042 : {
2043 : for (;;)
2044 26 : {
2045 : List *newrelids;
2046 :
2047 51 : newrelids = heap_truncate_find_FKs(relids);
2048 51 : if (newrelids == NIL)
2049 25 : break; /* nothing else to add */
2050 :
2051 88 : foreach(cell, newrelids)
2052 : {
2053 62 : Oid relid = lfirst_oid(cell);
2054 : Relation rel;
2055 :
2056 62 : rel = table_open(relid, AccessExclusiveLock);
2057 62 : ereport(NOTICE,
2058 : (errmsg("truncate cascades to table \"%s\"",
2059 : RelationGetRelationName(rel))));
2060 62 : truncate_check_rel(relid, rel->rd_rel);
2061 62 : truncate_check_perms(relid, rel->rd_rel);
2062 62 : truncate_check_activity(rel);
2063 62 : rels = lappend(rels, rel);
2064 62 : relids = lappend_oid(relids, relid);
2065 :
2066 : /* Log this relation only if needed for logical decoding */
2067 62 : if (RelationIsLogicallyLogged(rel))
2068 0 : relids_logged = lappend_oid(relids_logged, relid);
2069 : }
2070 : }
2071 : }
2072 :
2073 : /*
2074 : * Check foreign key references. In CASCADE mode, this should be
2075 : * unnecessary since we just pulled in all the references; but as a
2076 : * cross-check, do it anyway if in an Assert-enabled build.
2077 : */
2078 : #ifdef USE_ASSERT_CHECKING
2079 : heap_truncate_check_FKs(rels, false);
2080 : #else
2081 1125 : if (behavior == DROP_RESTRICT)
2082 1100 : heap_truncate_check_FKs(rels, false);
2083 : #endif
2084 :
2085 : /*
2086 : * If we are asked to restart sequences, find all the sequences, lock them
2087 : * (we need AccessExclusiveLock for ResetSequence), and check permissions.
2088 : * We want to do this early since it's pointless to do all the truncation
2089 : * work only to fail on sequence permissions.
2090 : */
2091 1076 : if (restart_seqs)
2092 : {
2093 30 : foreach(cell, rels)
2094 : {
2095 15 : Relation rel = (Relation) lfirst(cell);
2096 15 : List *seqlist = getOwnedSequences(RelationGetRelid(rel));
2097 : ListCell *seqcell;
2098 :
2099 37 : foreach(seqcell, seqlist)
2100 : {
2101 22 : Oid seq_relid = lfirst_oid(seqcell);
2102 : Relation seq_rel;
2103 :
2104 22 : seq_rel = relation_open(seq_relid, AccessExclusiveLock);
2105 :
2106 : /* This check must match AlterSequence! */
2107 22 : if (!object_ownercheck(RelationRelationId, seq_relid, GetUserId()))
2108 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SEQUENCE,
2109 0 : RelationGetRelationName(seq_rel));
2110 :
2111 22 : seq_relids = lappend_oid(seq_relids, seq_relid);
2112 :
2113 22 : relation_close(seq_rel, NoLock);
2114 : }
2115 : }
2116 : }
2117 :
2118 : /* Prepare to catch AFTER triggers. */
2119 1076 : AfterTriggerBeginQuery();
2120 :
2121 : /*
2122 : * To fire triggers, we'll need an EState as well as a ResultRelInfo for
2123 : * each relation. We don't need to call ExecOpenIndices, though.
2124 : *
2125 : * We put the ResultRelInfos in the es_opened_result_relations list, even
2126 : * though we don't have a range table and don't populate the
2127 : * es_result_relations array. That's a bit bogus, but it's enough to make
2128 : * ExecGetTriggerResultRel() find them.
2129 : */
2130 1076 : estate = CreateExecutorState();
2131 : resultRelInfos = (ResultRelInfo *)
2132 1076 : palloc(list_length(rels) * sizeof(ResultRelInfo));
2133 1076 : resultRelInfo = resultRelInfos;
2134 3569 : foreach(cell, rels)
2135 : {
2136 2493 : Relation rel = (Relation) lfirst(cell);
2137 :
2138 2493 : InitResultRelInfo(resultRelInfo,
2139 : rel,
2140 : 0, /* dummy rangetable index */
2141 : NULL,
2142 : 0);
2143 2493 : estate->es_opened_result_relations =
2144 2493 : lappend(estate->es_opened_result_relations, resultRelInfo);
2145 2493 : resultRelInfo++;
2146 : }
2147 :
2148 : /*
2149 : * Process all BEFORE STATEMENT TRUNCATE triggers before we begin
2150 : * truncating (this is because one of them might throw an error). Also, if
2151 : * we were to allow them to prevent statement execution, that would need
2152 : * to be handled here.
2153 : */
2154 1076 : resultRelInfo = resultRelInfos;
2155 3569 : foreach(cell, rels)
2156 : {
2157 : UserContext ucxt;
2158 :
2159 2493 : if (run_as_table_owner)
2160 36 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2161 : &ucxt);
2162 2493 : ExecBSTruncateTriggers(estate, resultRelInfo);
2163 2493 : if (run_as_table_owner)
2164 36 : RestoreUserContext(&ucxt);
2165 2493 : resultRelInfo++;
2166 : }
2167 :
2168 : /*
2169 : * OK, truncate each table.
2170 : */
2171 1076 : mySubid = GetCurrentSubTransactionId();
2172 :
2173 3569 : foreach(cell, rels)
2174 : {
2175 2493 : Relation rel = (Relation) lfirst(cell);
2176 :
2177 : /* Skip partitioned tables as there is nothing to do */
2178 2493 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2179 477 : continue;
2180 :
2181 : /*
2182 : * Build the lists of foreign tables belonging to each foreign server
2183 : * and pass each list to the foreign data wrapper's callback function,
2184 : * so that each server can truncate its all foreign tables in bulk.
2185 : * Each list is saved as a single entry in a hash table that uses the
2186 : * server OID as lookup key.
2187 : */
2188 2016 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
2189 17 : {
2190 17 : Oid serverid = GetForeignServerIdByRelId(RelationGetRelid(rel));
2191 : bool found;
2192 : ForeignTruncateInfo *ft_info;
2193 :
2194 : /* First time through, initialize hashtable for foreign tables */
2195 17 : if (!ft_htab)
2196 : {
2197 : HASHCTL hctl;
2198 :
2199 15 : memset(&hctl, 0, sizeof(HASHCTL));
2200 15 : hctl.keysize = sizeof(Oid);
2201 15 : hctl.entrysize = sizeof(ForeignTruncateInfo);
2202 15 : hctl.hcxt = CurrentMemoryContext;
2203 :
2204 15 : ft_htab = hash_create("TRUNCATE for Foreign Tables",
2205 : 32, /* start small and extend */
2206 : &hctl,
2207 : HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
2208 : }
2209 :
2210 : /* Find or create cached entry for the foreign table */
2211 17 : ft_info = hash_search(ft_htab, &serverid, HASH_ENTER, &found);
2212 17 : if (!found)
2213 15 : ft_info->rels = NIL;
2214 :
2215 : /*
2216 : * Save the foreign table in the entry of the server that the
2217 : * foreign table belongs to.
2218 : */
2219 17 : ft_info->rels = lappend(ft_info->rels, rel);
2220 17 : continue;
2221 : }
2222 :
2223 : /*
2224 : * Normally, we need a transaction-safe truncation here. However, if
2225 : * the table was either created in the current (sub)transaction or has
2226 : * a new relfilenumber in the current (sub)transaction, then we can
2227 : * just truncate it in-place, because a rollback would cause the whole
2228 : * table or the current physical file to be thrown away anyway.
2229 : */
2230 1999 : if (rel->rd_createSubid == mySubid ||
2231 1984 : rel->rd_newRelfilelocatorSubid == mySubid)
2232 : {
2233 : /* Immediate, non-rollbackable truncation is OK */
2234 47 : heap_truncate_one_rel(rel);
2235 : }
2236 : else
2237 : {
2238 : Oid heap_relid;
2239 : Oid toast_relid;
2240 1952 : ReindexParams reindex_params = {0};
2241 :
2242 : /*
2243 : * This effectively deletes all rows in the table, and may be done
2244 : * in a serializable transaction. In that case we must record a
2245 : * rw-conflict in to this transaction from each transaction
2246 : * holding a predicate lock on the table.
2247 : */
2248 1952 : CheckTableForSerializableConflictIn(rel);
2249 :
2250 : /*
2251 : * Need the full transaction-safe pushups.
2252 : *
2253 : * Create a new empty storage file for the relation, and assign it
2254 : * as the relfilenumber value. The old storage file is scheduled
2255 : * for deletion at commit.
2256 : */
2257 1952 : RelationSetNewRelfilenumber(rel, rel->rd_rel->relpersistence);
2258 :
2259 1952 : heap_relid = RelationGetRelid(rel);
2260 :
2261 : /*
2262 : * The same for the toast table, if any.
2263 : */
2264 1952 : toast_relid = rel->rd_rel->reltoastrelid;
2265 1952 : if (OidIsValid(toast_relid))
2266 : {
2267 1169 : Relation toastrel = relation_open(toast_relid,
2268 : AccessExclusiveLock);
2269 :
2270 1169 : RelationSetNewRelfilenumber(toastrel,
2271 1169 : toastrel->rd_rel->relpersistence);
2272 1169 : table_close(toastrel, NoLock);
2273 : }
2274 :
2275 : /*
2276 : * Reconstruct the indexes to match, and we're done.
2277 : */
2278 1952 : reindex_relation(NULL, heap_relid, REINDEX_REL_PROCESS_TOAST,
2279 : &reindex_params);
2280 : }
2281 :
2282 1999 : pgstat_count_truncate(rel);
2283 : }
2284 :
2285 : /* Now go through the hash table, and truncate foreign tables */
2286 1076 : if (ft_htab)
2287 : {
2288 : ForeignTruncateInfo *ft_info;
2289 : HASH_SEQ_STATUS seq;
2290 :
2291 15 : hash_seq_init(&seq, ft_htab);
2292 :
2293 15 : PG_TRY();
2294 : {
2295 26 : while ((ft_info = hash_seq_search(&seq)) != NULL)
2296 : {
2297 15 : FdwRoutine *routine = GetFdwRoutineByServerId(ft_info->serverid);
2298 :
2299 : /* truncate_check_rel() has checked that already */
2300 : Assert(routine->ExecForeignTruncate != NULL);
2301 :
2302 15 : routine->ExecForeignTruncate(ft_info->rels,
2303 : behavior,
2304 : restart_seqs);
2305 : }
2306 : }
2307 4 : PG_FINALLY();
2308 : {
2309 15 : hash_destroy(ft_htab);
2310 : }
2311 15 : PG_END_TRY();
2312 : }
2313 :
2314 : /*
2315 : * Restart owned sequences if we were asked to.
2316 : */
2317 1094 : foreach(cell, seq_relids)
2318 : {
2319 22 : Oid seq_relid = lfirst_oid(cell);
2320 :
2321 22 : ResetSequence(seq_relid);
2322 : }
2323 :
2324 : /*
2325 : * Write a WAL record to allow this set of actions to be logically
2326 : * decoded.
2327 : *
2328 : * Assemble an array of relids so we can write a single WAL record for the
2329 : * whole action.
2330 : */
2331 1072 : if (relids_logged != NIL)
2332 : {
2333 : xl_heap_truncate xlrec;
2334 33 : int i = 0;
2335 :
2336 : /* should only get here if effective_wal_level is 'logical' */
2337 : Assert(XLogLogicalInfoActive());
2338 :
2339 33 : logrelids = palloc(list_length(relids_logged) * sizeof(Oid));
2340 84 : foreach(cell, relids_logged)
2341 51 : logrelids[i++] = lfirst_oid(cell);
2342 :
2343 33 : xlrec.dbId = MyDatabaseId;
2344 33 : xlrec.nrelids = list_length(relids_logged);
2345 33 : xlrec.flags = 0;
2346 33 : if (behavior == DROP_CASCADE)
2347 1 : xlrec.flags |= XLH_TRUNCATE_CASCADE;
2348 33 : if (restart_seqs)
2349 2 : xlrec.flags |= XLH_TRUNCATE_RESTART_SEQS;
2350 :
2351 33 : XLogBeginInsert();
2352 33 : XLogRegisterData(&xlrec, SizeOfHeapTruncate);
2353 33 : XLogRegisterData(logrelids, list_length(relids_logged) * sizeof(Oid));
2354 :
2355 33 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
2356 :
2357 33 : (void) XLogInsert(RM_HEAP_ID, XLOG_HEAP_TRUNCATE);
2358 : }
2359 :
2360 : /*
2361 : * Process all AFTER STATEMENT TRUNCATE triggers.
2362 : */
2363 1072 : resultRelInfo = resultRelInfos;
2364 3561 : foreach(cell, rels)
2365 : {
2366 : UserContext ucxt;
2367 :
2368 2489 : if (run_as_table_owner)
2369 36 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2370 : &ucxt);
2371 2489 : ExecASTruncateTriggers(estate, resultRelInfo);
2372 2489 : if (run_as_table_owner)
2373 36 : RestoreUserContext(&ucxt);
2374 2489 : resultRelInfo++;
2375 : }
2376 :
2377 : /* Handle queued AFTER triggers */
2378 1072 : AfterTriggerEndQuery(estate);
2379 :
2380 : /* We can clean up the EState now */
2381 1072 : FreeExecutorState(estate);
2382 :
2383 : /*
2384 : * Close any rels opened by CASCADE (can't do this while EState still
2385 : * holds refs)
2386 : */
2387 1072 : rels = list_difference_ptr(rels, explicit_rels);
2388 1134 : foreach(cell, rels)
2389 : {
2390 62 : Relation rel = (Relation) lfirst(cell);
2391 :
2392 62 : table_close(rel, NoLock);
2393 : }
2394 1072 : }
2395 :
2396 : /*
2397 : * Check that a given relation is safe to truncate. Subroutine for
2398 : * ExecuteTruncate() and RangeVarCallbackForTruncate().
2399 : */
2400 : static void
2401 2687 : truncate_check_rel(Oid relid, Form_pg_class reltuple)
2402 : {
2403 2687 : char *relname = NameStr(reltuple->relname);
2404 :
2405 : /*
2406 : * Only allow truncate on regular tables, foreign tables using foreign
2407 : * data wrappers supporting TRUNCATE and partitioned tables (although, the
2408 : * latter are only being included here for the following checks; no
2409 : * physical truncation will occur in their case.).
2410 : */
2411 2687 : if (reltuple->relkind == RELKIND_FOREIGN_TABLE)
2412 : {
2413 19 : Oid serverid = GetForeignServerIdByRelId(relid);
2414 19 : FdwRoutine *fdwroutine = GetFdwRoutineByServerId(serverid);
2415 :
2416 18 : if (!fdwroutine->ExecForeignTruncate)
2417 1 : ereport(ERROR,
2418 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2419 : errmsg("cannot truncate foreign table \"%s\"",
2420 : relname)));
2421 : }
2422 2668 : else if (reltuple->relkind != RELKIND_RELATION &&
2423 497 : reltuple->relkind != RELKIND_PARTITIONED_TABLE)
2424 0 : ereport(ERROR,
2425 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2426 : errmsg("\"%s\" is not a table", relname)));
2427 :
2428 : /*
2429 : * Most system catalogs can't be truncated at all, or at least not unless
2430 : * allow_system_table_mods=on. As an exception, however, we allow
2431 : * pg_largeobject and pg_largeobject_metadata to be truncated as part of
2432 : * pg_upgrade, because we need to change its relfilenode to match the old
2433 : * cluster, and allowing a TRUNCATE command to be executed is the easiest
2434 : * way of doing that.
2435 : */
2436 2685 : if (!allowSystemTableMods && IsSystemClass(relid, reltuple)
2437 65 : && (!IsBinaryUpgrade ||
2438 32 : (relid != LargeObjectRelationId &&
2439 : relid != LargeObjectMetadataRelationId)))
2440 1 : ereport(ERROR,
2441 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
2442 : errmsg("permission denied: \"%s\" is a system catalog",
2443 : relname)));
2444 :
2445 2684 : InvokeObjectTruncateHook(relid);
2446 2684 : }
2447 :
2448 : /*
2449 : * Check that current user has the permission to truncate given relation.
2450 : */
2451 : static void
2452 1468 : truncate_check_perms(Oid relid, Form_pg_class reltuple)
2453 : {
2454 1468 : char *relname = NameStr(reltuple->relname);
2455 : AclResult aclresult;
2456 :
2457 : /* Permissions checks */
2458 1468 : aclresult = pg_class_aclcheck(relid, GetUserId(), ACL_TRUNCATE);
2459 1468 : if (aclresult != ACLCHECK_OK)
2460 20 : aclcheck_error(aclresult, get_relkind_objtype(reltuple->relkind),
2461 : relname);
2462 1448 : }
2463 :
2464 : /*
2465 : * Set of extra sanity checks to check if a given relation is safe to
2466 : * truncate. This is split with truncate_check_rel() as
2467 : * RangeVarCallbackForTruncate() cannot open a Relation yet.
2468 : */
2469 : static void
2470 2566 : truncate_check_activity(Relation rel)
2471 : {
2472 : /*
2473 : * Don't allow truncate on temp tables of other backends ... their local
2474 : * buffer manager is not going to cope.
2475 : */
2476 2566 : if (RELATION_IS_OTHER_TEMP(rel))
2477 0 : ereport(ERROR,
2478 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2479 : errmsg("cannot truncate temporary tables of other sessions")));
2480 :
2481 : /*
2482 : * Also check for active uses of the relation in the current transaction,
2483 : * including open scans and pending AFTER trigger events.
2484 : */
2485 2566 : CheckTableNotInUse(rel, "TRUNCATE");
2486 2562 : }
2487 :
2488 : /*
2489 : * storage_name
2490 : * returns the name corresponding to a typstorage/attstorage enum value
2491 : */
2492 : static const char *
2493 16 : storage_name(char c)
2494 : {
2495 16 : switch (c)
2496 : {
2497 0 : case TYPSTORAGE_PLAIN:
2498 0 : return "PLAIN";
2499 0 : case TYPSTORAGE_EXTERNAL:
2500 0 : return "EXTERNAL";
2501 8 : case TYPSTORAGE_EXTENDED:
2502 8 : return "EXTENDED";
2503 8 : case TYPSTORAGE_MAIN:
2504 8 : return "MAIN";
2505 0 : default:
2506 0 : return "???";
2507 : }
2508 : }
2509 :
2510 : /*----------
2511 : * MergeAttributes
2512 : * Returns new schema given initial schema and superclasses.
2513 : *
2514 : * Input arguments:
2515 : * 'columns' is the column/attribute definition for the table. (It's a list
2516 : * of ColumnDef's.) It is destructively changed.
2517 : * 'supers' is a list of OIDs of parent relations, already locked by caller.
2518 : * 'relpersistence' is the persistence type of the table.
2519 : * 'is_partition' tells if the table is a partition.
2520 : *
2521 : * Output arguments:
2522 : * 'supconstr' receives a list of CookedConstraint representing
2523 : * CHECK constraints belonging to parent relations, updated as
2524 : * necessary to be valid for the child.
2525 : * 'supnotnulls' receives a list of CookedConstraint representing
2526 : * not-null constraints based on those from parent relations.
2527 : *
2528 : * Return value:
2529 : * Completed schema list.
2530 : *
2531 : * Notes:
2532 : * The order in which the attributes are inherited is very important.
2533 : * Intuitively, the inherited attributes should come first. If a table
2534 : * inherits from multiple parents, the order of those attributes are
2535 : * according to the order of the parents specified in CREATE TABLE.
2536 : *
2537 : * Here's an example:
2538 : *
2539 : * create table person (name text, age int4, location point);
2540 : * create table emp (salary int4, manager text) inherits(person);
2541 : * create table student (gpa float8) inherits (person);
2542 : * create table stud_emp (percent int4) inherits (emp, student);
2543 : *
2544 : * The order of the attributes of stud_emp is:
2545 : *
2546 : * person {1:name, 2:age, 3:location}
2547 : * / \
2548 : * {6:gpa} student emp {4:salary, 5:manager}
2549 : * \ /
2550 : * stud_emp {7:percent}
2551 : *
2552 : * If the same attribute name appears multiple times, then it appears
2553 : * in the result table in the proper location for its first appearance.
2554 : *
2555 : * Constraints (including not-null constraints) for the child table
2556 : * are the union of all relevant constraints, from both the child schema
2557 : * and parent tables. In addition, in legacy inheritance, each column that
2558 : * appears in a primary key in any of the parents also gets a NOT NULL
2559 : * constraint (partitioning doesn't need this, because the PK itself gets
2560 : * inherited.)
2561 : *
2562 : * The default value for a child column is defined as:
2563 : * (1) If the child schema specifies a default, that value is used.
2564 : * (2) If neither the child nor any parent specifies a default, then
2565 : * the column will not have a default.
2566 : * (3) If conflicting defaults are inherited from different parents
2567 : * (and not overridden by the child), an error is raised.
2568 : * (4) Otherwise the inherited default is used.
2569 : *
2570 : * Note that the default-value infrastructure is used for generated
2571 : * columns' expressions too, so most of the preceding paragraph applies
2572 : * to generation expressions too. We insist that a child column be
2573 : * generated if and only if its parent(s) are, but it need not have
2574 : * the same generation expression.
2575 : *----------
2576 : */
2577 : static List *
2578 39664 : MergeAttributes(List *columns, const List *supers, char relpersistence,
2579 : bool is_partition, List **supconstr, List **supnotnulls)
2580 : {
2581 39664 : List *inh_columns = NIL;
2582 39664 : List *constraints = NIL;
2583 39664 : List *nnconstraints = NIL;
2584 39664 : bool have_bogus_defaults = false;
2585 : int child_attno;
2586 : static Node bogus_marker = {0}; /* marks conflicting defaults */
2587 39664 : List *saved_columns = NIL;
2588 : ListCell *lc;
2589 :
2590 : /*
2591 : * Check for and reject tables with too many columns. We perform this
2592 : * check relatively early for two reasons: (a) we don't run the risk of
2593 : * overflowing an AttrNumber in subsequent code (b) an O(n^2) algorithm is
2594 : * okay if we're processing <= 1600 columns, but could take minutes to
2595 : * execute if the user attempts to create a table with hundreds of
2596 : * thousands of columns.
2597 : *
2598 : * Note that we also need to check that we do not exceed this figure after
2599 : * including columns from inherited relations.
2600 : */
2601 39664 : if (list_length(columns) > MaxHeapAttributeNumber)
2602 0 : ereport(ERROR,
2603 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
2604 : errmsg("tables can have at most %d columns",
2605 : MaxHeapAttributeNumber)));
2606 :
2607 : /*
2608 : * Check for duplicate names in the explicit list of attributes.
2609 : *
2610 : * Although we might consider merging such entries in the same way that we
2611 : * handle name conflicts for inherited attributes, it seems to make more
2612 : * sense to assume such conflicts are errors.
2613 : *
2614 : * We don't use foreach() here because we have two nested loops over the
2615 : * columns list, with possible element deletions in the inner one. If we
2616 : * used foreach_delete_current() it could only fix up the state of one of
2617 : * the loops, so it seems cleaner to use looping over list indexes for
2618 : * both loops. Note that any deletion will happen beyond where the outer
2619 : * loop is, so its index never needs adjustment.
2620 : */
2621 178037 : for (int coldefpos = 0; coldefpos < list_length(columns); coldefpos++)
2622 : {
2623 138389 : ColumnDef *coldef = list_nth_node(ColumnDef, columns, coldefpos);
2624 :
2625 138389 : if (!is_partition && coldef->typeName == NULL)
2626 : {
2627 : /*
2628 : * Typed table column option that does not belong to a column from
2629 : * the type. This works because the columns from the type come
2630 : * first in the list. (We omit this check for partition column
2631 : * lists; those are processed separately below.)
2632 : */
2633 4 : ereport(ERROR,
2634 : (errcode(ERRCODE_UNDEFINED_COLUMN),
2635 : errmsg("column \"%s\" does not exist",
2636 : coldef->colname)));
2637 : }
2638 :
2639 : /* restpos scans all entries beyond coldef; incr is in loop body */
2640 3993289 : for (int restpos = coldefpos + 1; restpos < list_length(columns);)
2641 : {
2642 3854916 : ColumnDef *restdef = list_nth_node(ColumnDef, columns, restpos);
2643 :
2644 3854916 : if (strcmp(coldef->colname, restdef->colname) == 0)
2645 : {
2646 33 : if (coldef->is_from_type)
2647 : {
2648 : /*
2649 : * merge the column options into the column from the type
2650 : */
2651 21 : coldef->is_not_null = restdef->is_not_null;
2652 21 : coldef->raw_default = restdef->raw_default;
2653 21 : coldef->cooked_default = restdef->cooked_default;
2654 21 : coldef->constraints = restdef->constraints;
2655 21 : coldef->is_from_type = false;
2656 21 : columns = list_delete_nth_cell(columns, restpos);
2657 : }
2658 : else
2659 12 : ereport(ERROR,
2660 : (errcode(ERRCODE_DUPLICATE_COLUMN),
2661 : errmsg("column \"%s\" specified more than once",
2662 : coldef->colname)));
2663 : }
2664 : else
2665 3854883 : restpos++;
2666 : }
2667 : }
2668 :
2669 : /*
2670 : * In case of a partition, there are no new column definitions, only dummy
2671 : * ColumnDefs created for column constraints. Set them aside for now and
2672 : * process them at the end.
2673 : */
2674 39648 : if (is_partition)
2675 : {
2676 6127 : saved_columns = columns;
2677 6127 : columns = NIL;
2678 : }
2679 :
2680 : /*
2681 : * Scan the parents left-to-right, and merge their attributes to form a
2682 : * list of inherited columns (inh_columns).
2683 : */
2684 39648 : child_attno = 0;
2685 47348 : foreach(lc, supers)
2686 : {
2687 7756 : Oid parent = lfirst_oid(lc);
2688 : Relation relation;
2689 : TupleDesc tupleDesc;
2690 : TupleConstr *constr;
2691 : AttrMap *newattmap;
2692 : List *inherited_defaults;
2693 : List *cols_with_defaults;
2694 : List *nnconstrs;
2695 : ListCell *lc1;
2696 : ListCell *lc2;
2697 7756 : Bitmapset *nncols = NULL;
2698 :
2699 : /* caller already got lock */
2700 7756 : relation = table_open(parent, NoLock);
2701 :
2702 : /*
2703 : * Check for active uses of the parent partitioned table in the
2704 : * current transaction, such as being used in some manner by an
2705 : * enclosing command.
2706 : */
2707 7756 : if (is_partition)
2708 6127 : CheckTableNotInUse(relation, "CREATE TABLE .. PARTITION OF");
2709 :
2710 : /*
2711 : * We do not allow partitioned tables and partitions to participate in
2712 : * regular inheritance.
2713 : */
2714 7752 : if (relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !is_partition)
2715 4 : ereport(ERROR,
2716 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2717 : errmsg("cannot inherit from partitioned table \"%s\"",
2718 : RelationGetRelationName(relation))));
2719 7748 : if (relation->rd_rel->relispartition && !is_partition)
2720 4 : ereport(ERROR,
2721 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2722 : errmsg("cannot inherit from partition \"%s\"",
2723 : RelationGetRelationName(relation))));
2724 :
2725 7744 : if (relation->rd_rel->relkind != RELKIND_RELATION &&
2726 6123 : relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2727 6111 : relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2728 0 : ereport(ERROR,
2729 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2730 : errmsg("inherited relation \"%s\" is not a table or foreign table",
2731 : RelationGetRelationName(relation))));
2732 :
2733 : /*
2734 : * If the parent is permanent, so must be all of its partitions. Note
2735 : * that inheritance allows that case.
2736 : */
2737 7744 : if (is_partition &&
2738 6123 : relation->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
2739 : relpersistence == RELPERSISTENCE_TEMP)
2740 4 : ereport(ERROR,
2741 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2742 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
2743 : RelationGetRelationName(relation))));
2744 :
2745 : /* Permanent rels cannot inherit from temporary ones */
2746 7740 : if (relpersistence != RELPERSISTENCE_TEMP &&
2747 7470 : relation->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
2748 16 : ereport(ERROR,
2749 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2750 : errmsg(!is_partition
2751 : ? "cannot inherit from temporary relation \"%s\""
2752 : : "cannot create a permanent relation as partition of temporary relation \"%s\"",
2753 : RelationGetRelationName(relation))));
2754 :
2755 : /* If existing rel is temp, it must belong to this session */
2756 7724 : if (RELATION_IS_OTHER_TEMP(relation))
2757 0 : ereport(ERROR,
2758 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2759 : errmsg(!is_partition
2760 : ? "cannot inherit from temporary relation of another session"
2761 : : "cannot create as partition of temporary relation of another session")));
2762 :
2763 : /*
2764 : * We should have an UNDER permission flag for this, but for now,
2765 : * demand that creator of a child table own the parent.
2766 : */
2767 7724 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(relation), GetUserId()))
2768 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(relation->rd_rel->relkind),
2769 0 : RelationGetRelationName(relation));
2770 :
2771 7724 : tupleDesc = RelationGetDescr(relation);
2772 7724 : constr = tupleDesc->constr;
2773 :
2774 : /*
2775 : * newattmap->attnums[] will contain the child-table attribute numbers
2776 : * for the attributes of this parent table. (They are not the same
2777 : * for parents after the first one, nor if we have dropped columns.)
2778 : */
2779 7724 : newattmap = make_attrmap(tupleDesc->natts);
2780 :
2781 : /* We can't process inherited defaults until newattmap is complete. */
2782 7724 : inherited_defaults = cols_with_defaults = NIL;
2783 :
2784 : /*
2785 : * Request attnotnull on columns that have a not-null constraint
2786 : * that's not marked NO INHERIT (even if not valid).
2787 : */
2788 7724 : nnconstrs = RelationGetNotNullConstraints(RelationGetRelid(relation),
2789 : true, false);
2790 17162 : foreach_ptr(CookedConstraint, cc, nnconstrs)
2791 1714 : nncols = bms_add_member(nncols, cc->attnum);
2792 :
2793 23375 : for (AttrNumber parent_attno = 1; parent_attno <= tupleDesc->natts;
2794 15651 : parent_attno++)
2795 : {
2796 15675 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
2797 : parent_attno - 1);
2798 15675 : char *attributeName = NameStr(attribute->attname);
2799 : int exist_attno;
2800 : ColumnDef *newdef;
2801 : ColumnDef *mergeddef;
2802 :
2803 : /*
2804 : * Ignore dropped columns in the parent.
2805 : */
2806 15675 : if (attribute->attisdropped)
2807 132 : continue; /* leave newattmap->attnums entry as zero */
2808 :
2809 : /*
2810 : * Create new column definition
2811 : */
2812 15543 : newdef = makeColumnDef(attributeName, attribute->atttypid,
2813 : attribute->atttypmod, attribute->attcollation);
2814 15543 : newdef->storage = attribute->attstorage;
2815 15543 : newdef->generated = attribute->attgenerated;
2816 15543 : if (CompressionMethodIsValid(attribute->attcompression))
2817 24 : newdef->compression =
2818 24 : pstrdup(GetCompressionMethodName(attribute->attcompression));
2819 :
2820 : /*
2821 : * Regular inheritance children are independent enough not to
2822 : * inherit identity columns. But partitions are integral part of
2823 : * a partitioned table and inherit identity column.
2824 : */
2825 15543 : if (is_partition)
2826 12597 : newdef->identity = attribute->attidentity;
2827 :
2828 : /*
2829 : * Does it match some previously considered column from another
2830 : * parent?
2831 : */
2832 15543 : exist_attno = findAttrByName(attributeName, inh_columns);
2833 15543 : if (exist_attno > 0)
2834 : {
2835 : /*
2836 : * Yes, try to merge the two column definitions.
2837 : */
2838 245 : mergeddef = MergeInheritedAttribute(inh_columns, exist_attno, newdef);
2839 :
2840 221 : newattmap->attnums[parent_attno - 1] = exist_attno;
2841 :
2842 : /*
2843 : * Partitions have only one parent, so conflict should never
2844 : * occur.
2845 : */
2846 : Assert(!is_partition);
2847 : }
2848 : else
2849 : {
2850 : /*
2851 : * No, create a new inherited column
2852 : */
2853 15298 : newdef->inhcount = 1;
2854 15298 : newdef->is_local = false;
2855 15298 : inh_columns = lappend(inh_columns, newdef);
2856 :
2857 15298 : newattmap->attnums[parent_attno - 1] = ++child_attno;
2858 15298 : mergeddef = newdef;
2859 : }
2860 :
2861 : /*
2862 : * mark attnotnull if parent has it
2863 : */
2864 15519 : if (bms_is_member(parent_attno, nncols))
2865 1714 : mergeddef->is_not_null = true;
2866 :
2867 : /*
2868 : * Locate default/generation expression if any
2869 : */
2870 15519 : if (attribute->atthasdef)
2871 : {
2872 : Node *this_default;
2873 :
2874 530 : this_default = TupleDescGetDefault(tupleDesc, parent_attno);
2875 530 : if (this_default == NULL)
2876 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
2877 : parent_attno, RelationGetRelationName(relation));
2878 :
2879 : /*
2880 : * If it's a GENERATED default, it might contain Vars that
2881 : * need to be mapped to the inherited column(s)' new numbers.
2882 : * We can't do that till newattmap is ready, so just remember
2883 : * all the inherited default expressions for the moment.
2884 : */
2885 530 : inherited_defaults = lappend(inherited_defaults, this_default);
2886 530 : cols_with_defaults = lappend(cols_with_defaults, mergeddef);
2887 : }
2888 : }
2889 :
2890 : /*
2891 : * Now process any inherited default expressions, adjusting attnos
2892 : * using the completed newattmap map.
2893 : */
2894 8230 : forboth(lc1, inherited_defaults, lc2, cols_with_defaults)
2895 : {
2896 530 : Node *this_default = (Node *) lfirst(lc1);
2897 530 : ColumnDef *def = (ColumnDef *) lfirst(lc2);
2898 : bool found_whole_row;
2899 :
2900 : /* Adjust Vars to match new table's column numbering */
2901 530 : this_default = map_variable_attnos(this_default,
2902 : 1, 0,
2903 : newattmap,
2904 : InvalidOid, &found_whole_row);
2905 :
2906 : /*
2907 : * For the moment we have to reject whole-row variables. We could
2908 : * convert them, if we knew the new table's rowtype OID, but that
2909 : * hasn't been assigned yet. (A variable could only appear in a
2910 : * generation expression, so the error message is correct.)
2911 : */
2912 530 : if (found_whole_row)
2913 0 : ereport(ERROR,
2914 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2915 : errmsg("cannot convert whole-row table reference"),
2916 : errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
2917 : def->colname,
2918 : RelationGetRelationName(relation))));
2919 :
2920 : /*
2921 : * If we already had a default from some prior parent, check to
2922 : * see if they are the same. If so, no problem; if not, mark the
2923 : * column as having a bogus default. Below, we will complain if
2924 : * the bogus default isn't overridden by the child columns.
2925 : */
2926 : Assert(def->raw_default == NULL);
2927 530 : if (def->cooked_default == NULL)
2928 502 : def->cooked_default = this_default;
2929 28 : else if (!equal(def->cooked_default, this_default))
2930 : {
2931 24 : def->cooked_default = &bogus_marker;
2932 24 : have_bogus_defaults = true;
2933 : }
2934 : }
2935 :
2936 : /*
2937 : * Now copy the CHECK constraints of this parent, adjusting attnos
2938 : * using the completed newattmap map. Identically named constraints
2939 : * are merged if possible, else we throw error.
2940 : */
2941 7700 : if (constr && constr->num_check > 0)
2942 : {
2943 245 : ConstrCheck *check = constr->check;
2944 :
2945 770 : for (int i = 0; i < constr->num_check; i++)
2946 : {
2947 525 : char *name = check[i].ccname;
2948 : Node *expr;
2949 : bool found_whole_row;
2950 :
2951 : /* ignore if the constraint is non-inheritable */
2952 525 : if (check[i].ccnoinherit)
2953 32 : continue;
2954 :
2955 : /* Adjust Vars to match new table's column numbering */
2956 493 : expr = map_variable_attnos(stringToNode(check[i].ccbin),
2957 : 1, 0,
2958 : newattmap,
2959 : InvalidOid, &found_whole_row);
2960 :
2961 : /*
2962 : * For the moment we have to reject whole-row variables. We
2963 : * could convert them, if we knew the new table's rowtype OID,
2964 : * but that hasn't been assigned yet.
2965 : */
2966 493 : if (found_whole_row)
2967 0 : ereport(ERROR,
2968 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2969 : errmsg("cannot convert whole-row table reference"),
2970 : errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
2971 : name,
2972 : RelationGetRelationName(relation))));
2973 :
2974 493 : constraints = MergeCheckConstraint(constraints, name, expr,
2975 493 : check[i].ccenforced);
2976 : }
2977 : }
2978 :
2979 : /*
2980 : * Also copy the not-null constraints from this parent. The
2981 : * attnotnull markings were already installed above.
2982 : */
2983 17114 : foreach_ptr(CookedConstraint, nn, nnconstrs)
2984 : {
2985 : Assert(nn->contype == CONSTR_NOTNULL);
2986 :
2987 1714 : nn->attnum = newattmap->attnums[nn->attnum - 1];
2988 :
2989 1714 : nnconstraints = lappend(nnconstraints, nn);
2990 : }
2991 :
2992 7700 : free_attrmap(newattmap);
2993 :
2994 : /*
2995 : * Close the parent rel, but keep our lock on it until xact commit.
2996 : * That will prevent someone else from deleting or ALTERing the parent
2997 : * before the child is committed.
2998 : */
2999 7700 : table_close(relation, NoLock);
3000 : }
3001 :
3002 : /*
3003 : * If we had no inherited attributes, the result columns are just the
3004 : * explicitly declared columns. Otherwise, we need to merge the declared
3005 : * columns into the inherited column list. Although, we never have any
3006 : * explicitly declared columns if the table is a partition.
3007 : */
3008 39592 : if (inh_columns != NIL)
3009 : {
3010 7410 : int newcol_attno = 0;
3011 :
3012 8058 : foreach(lc, columns)
3013 : {
3014 700 : ColumnDef *newdef = lfirst_node(ColumnDef, lc);
3015 700 : char *attributeName = newdef->colname;
3016 : int exist_attno;
3017 :
3018 : /*
3019 : * Partitions have only one parent and have no column definitions
3020 : * of their own, so conflict should never occur.
3021 : */
3022 : Assert(!is_partition);
3023 :
3024 700 : newcol_attno++;
3025 :
3026 : /*
3027 : * Does it match some inherited column?
3028 : */
3029 700 : exist_attno = findAttrByName(attributeName, inh_columns);
3030 700 : if (exist_attno > 0)
3031 : {
3032 : /*
3033 : * Yes, try to merge the two column definitions.
3034 : */
3035 251 : MergeChildAttribute(inh_columns, exist_attno, newcol_attno, newdef);
3036 : }
3037 : else
3038 : {
3039 : /*
3040 : * No, attach new column unchanged to result columns.
3041 : */
3042 449 : inh_columns = lappend(inh_columns, newdef);
3043 : }
3044 : }
3045 :
3046 7358 : columns = inh_columns;
3047 :
3048 : /*
3049 : * Check that we haven't exceeded the legal # of columns after merging
3050 : * in inherited columns.
3051 : */
3052 7358 : if (list_length(columns) > MaxHeapAttributeNumber)
3053 0 : ereport(ERROR,
3054 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
3055 : errmsg("tables can have at most %d columns",
3056 : MaxHeapAttributeNumber)));
3057 : }
3058 :
3059 : /*
3060 : * Now that we have the column definition list for a partition, we can
3061 : * check whether the columns referenced in the column constraint specs
3062 : * actually exist. Also, merge column defaults.
3063 : */
3064 39540 : if (is_partition)
3065 : {
3066 6234 : foreach(lc, saved_columns)
3067 : {
3068 151 : ColumnDef *restdef = lfirst(lc);
3069 151 : bool found = false;
3070 : ListCell *l;
3071 :
3072 549 : foreach(l, columns)
3073 : {
3074 422 : ColumnDef *coldef = lfirst(l);
3075 :
3076 422 : if (strcmp(coldef->colname, restdef->colname) == 0)
3077 : {
3078 151 : found = true;
3079 :
3080 : /*
3081 : * Check for conflicts related to generated columns.
3082 : *
3083 : * Same rules as above: generated-ness has to match the
3084 : * parent, but the contents of the generation expression
3085 : * can be different.
3086 : */
3087 151 : if (coldef->generated)
3088 : {
3089 80 : if (restdef->raw_default && !restdef->generated)
3090 8 : ereport(ERROR,
3091 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3092 : errmsg("column \"%s\" inherits from generated column but specifies default",
3093 : restdef->colname)));
3094 72 : if (restdef->identity)
3095 0 : ereport(ERROR,
3096 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3097 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3098 : restdef->colname)));
3099 : }
3100 : else
3101 : {
3102 71 : if (restdef->generated)
3103 8 : ereport(ERROR,
3104 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3105 : errmsg("child column \"%s\" specifies generation expression",
3106 : restdef->colname),
3107 : errhint("A child table column cannot be generated unless its parent column is.")));
3108 : }
3109 :
3110 135 : if (coldef->generated && restdef->generated && coldef->generated != restdef->generated)
3111 8 : ereport(ERROR,
3112 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3113 : errmsg("column \"%s\" inherits from generated column of different kind",
3114 : restdef->colname),
3115 : errdetail("Parent column is %s, child column is %s.",
3116 : coldef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3117 : restdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3118 :
3119 : /*
3120 : * Override the parent's default value for this column
3121 : * (coldef->cooked_default) with the partition's local
3122 : * definition (restdef->raw_default), if there's one. It
3123 : * should be physically impossible to get a cooked default
3124 : * in the local definition or a raw default in the
3125 : * inherited definition, but make sure they're nulls, for
3126 : * future-proofing.
3127 : */
3128 : Assert(restdef->cooked_default == NULL);
3129 : Assert(coldef->raw_default == NULL);
3130 127 : if (restdef->raw_default)
3131 : {
3132 79 : coldef->raw_default = restdef->raw_default;
3133 79 : coldef->cooked_default = NULL;
3134 : }
3135 : }
3136 : }
3137 :
3138 : /* complain for constraints on columns not in parent */
3139 127 : if (!found)
3140 0 : ereport(ERROR,
3141 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3142 : errmsg("column \"%s\" does not exist",
3143 : restdef->colname)));
3144 : }
3145 : }
3146 :
3147 : /*
3148 : * If we found any conflicting parent default values, check to make sure
3149 : * they were overridden by the child.
3150 : */
3151 39516 : if (have_bogus_defaults)
3152 : {
3153 60 : foreach(lc, columns)
3154 : {
3155 48 : ColumnDef *def = lfirst(lc);
3156 :
3157 48 : if (def->cooked_default == &bogus_marker)
3158 : {
3159 12 : if (def->generated)
3160 8 : ereport(ERROR,
3161 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3162 : errmsg("column \"%s\" inherits conflicting generation expressions",
3163 : def->colname),
3164 : errhint("To resolve the conflict, specify a generation expression explicitly.")));
3165 : else
3166 4 : ereport(ERROR,
3167 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3168 : errmsg("column \"%s\" inherits conflicting default values",
3169 : def->colname),
3170 : errhint("To resolve the conflict, specify a default explicitly.")));
3171 : }
3172 : }
3173 : }
3174 :
3175 39504 : *supconstr = constraints;
3176 39504 : *supnotnulls = nnconstraints;
3177 :
3178 39504 : return columns;
3179 : }
3180 :
3181 :
3182 : /*
3183 : * MergeCheckConstraint
3184 : * Try to merge an inherited CHECK constraint with previous ones
3185 : *
3186 : * If we inherit identically-named constraints from multiple parents, we must
3187 : * merge them, or throw an error if they don't have identical definitions.
3188 : *
3189 : * constraints is a list of CookedConstraint structs for previous constraints.
3190 : *
3191 : * If the new constraint matches an existing one, then the existing
3192 : * constraint's inheritance count is updated. If there is a conflict (same
3193 : * name but different expression), throw an error. If the constraint neither
3194 : * matches nor conflicts with an existing one, a new constraint is appended to
3195 : * the list.
3196 : */
3197 : static List *
3198 493 : MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced)
3199 : {
3200 : ListCell *lc;
3201 : CookedConstraint *newcon;
3202 :
3203 1521 : foreach(lc, constraints)
3204 : {
3205 1128 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lc);
3206 :
3207 : Assert(ccon->contype == CONSTR_CHECK);
3208 :
3209 : /* Non-matching names never conflict */
3210 1128 : if (strcmp(ccon->name, name) != 0)
3211 1028 : continue;
3212 :
3213 100 : if (equal(expr, ccon->expr))
3214 : {
3215 : /* OK to merge constraint with existing */
3216 100 : if (pg_add_s16_overflow(ccon->inhcount, 1,
3217 : &ccon->inhcount))
3218 0 : ereport(ERROR,
3219 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3220 : errmsg("too many inheritance parents"));
3221 :
3222 : /*
3223 : * When enforceability differs, the merged constraint should be
3224 : * marked as ENFORCED because one of the parents is ENFORCED.
3225 : */
3226 100 : if (!ccon->is_enforced && is_enforced)
3227 : {
3228 32 : ccon->is_enforced = true;
3229 32 : ccon->skip_validation = false;
3230 : }
3231 :
3232 100 : return constraints;
3233 : }
3234 :
3235 0 : ereport(ERROR,
3236 : (errcode(ERRCODE_DUPLICATE_OBJECT),
3237 : errmsg("check constraint name \"%s\" appears multiple times but with different expressions",
3238 : name)));
3239 : }
3240 :
3241 : /*
3242 : * Constraint couldn't be merged with an existing one and also didn't
3243 : * conflict with an existing one, so add it as a new one to the list.
3244 : */
3245 393 : newcon = palloc0_object(CookedConstraint);
3246 393 : newcon->contype = CONSTR_CHECK;
3247 393 : newcon->name = pstrdup(name);
3248 393 : newcon->expr = expr;
3249 393 : newcon->inhcount = 1;
3250 393 : newcon->is_enforced = is_enforced;
3251 393 : newcon->skip_validation = !is_enforced;
3252 393 : return lappend(constraints, newcon);
3253 : }
3254 :
3255 : /*
3256 : * MergeChildAttribute
3257 : * Merge given child attribute definition into given inherited attribute.
3258 : *
3259 : * Input arguments:
3260 : * 'inh_columns' is the list of inherited ColumnDefs.
3261 : * 'exist_attno' is the number of the inherited attribute in inh_columns
3262 : * 'newcol_attno' is the attribute number in child table's schema definition
3263 : * 'newdef' is the column/attribute definition from the child table.
3264 : *
3265 : * The ColumnDef in 'inh_columns' list is modified. The child attribute's
3266 : * ColumnDef remains unchanged.
3267 : *
3268 : * Notes:
3269 : * - The attribute is merged according to the rules laid out in the prologue
3270 : * of MergeAttributes().
3271 : * - If matching inherited attribute exists but the child attribute can not be
3272 : * merged into it, the function throws respective errors.
3273 : * - A partition can not have its own column definitions. Hence this function
3274 : * is applicable only to a regular inheritance child.
3275 : */
3276 : static void
3277 251 : MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef)
3278 : {
3279 251 : char *attributeName = newdef->colname;
3280 : ColumnDef *inhdef;
3281 : Oid inhtypeid,
3282 : newtypeid;
3283 : int32 inhtypmod,
3284 : newtypmod;
3285 : Oid inhcollid,
3286 : newcollid;
3287 :
3288 251 : if (exist_attno == newcol_attno)
3289 229 : ereport(NOTICE,
3290 : (errmsg("merging column \"%s\" with inherited definition",
3291 : attributeName)));
3292 : else
3293 22 : ereport(NOTICE,
3294 : (errmsg("moving and merging column \"%s\" with inherited definition", attributeName),
3295 : errdetail("User-specified column moved to the position of the inherited column.")));
3296 :
3297 251 : inhdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3298 :
3299 : /*
3300 : * Must have the same type and typmod
3301 : */
3302 251 : typenameTypeIdAndMod(NULL, inhdef->typeName, &inhtypeid, &inhtypmod);
3303 251 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3304 251 : if (inhtypeid != newtypeid || inhtypmod != newtypmod)
3305 8 : ereport(ERROR,
3306 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3307 : errmsg("column \"%s\" has a type conflict",
3308 : attributeName),
3309 : errdetail("%s versus %s",
3310 : format_type_with_typemod(inhtypeid, inhtypmod),
3311 : format_type_with_typemod(newtypeid, newtypmod))));
3312 :
3313 : /*
3314 : * Must have the same collation
3315 : */
3316 243 : inhcollid = GetColumnDefCollation(NULL, inhdef, inhtypeid);
3317 243 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3318 243 : if (inhcollid != newcollid)
3319 4 : ereport(ERROR,
3320 : (errcode(ERRCODE_COLLATION_MISMATCH),
3321 : errmsg("column \"%s\" has a collation conflict",
3322 : attributeName),
3323 : errdetail("\"%s\" versus \"%s\"",
3324 : get_collation_name(inhcollid),
3325 : get_collation_name(newcollid))));
3326 :
3327 : /*
3328 : * Identity is never inherited by a regular inheritance child. Pick
3329 : * child's identity definition if there's one.
3330 : */
3331 239 : inhdef->identity = newdef->identity;
3332 :
3333 : /*
3334 : * Copy storage parameter
3335 : */
3336 239 : if (inhdef->storage == 0)
3337 0 : inhdef->storage = newdef->storage;
3338 239 : else if (newdef->storage != 0 && inhdef->storage != newdef->storage)
3339 4 : ereport(ERROR,
3340 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3341 : errmsg("column \"%s\" has a storage parameter conflict",
3342 : attributeName),
3343 : errdetail("%s versus %s",
3344 : storage_name(inhdef->storage),
3345 : storage_name(newdef->storage))));
3346 :
3347 : /*
3348 : * Copy compression parameter
3349 : */
3350 235 : if (inhdef->compression == NULL)
3351 231 : inhdef->compression = newdef->compression;
3352 4 : else if (newdef->compression != NULL)
3353 : {
3354 4 : if (strcmp(inhdef->compression, newdef->compression) != 0)
3355 4 : ereport(ERROR,
3356 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3357 : errmsg("column \"%s\" has a compression method conflict",
3358 : attributeName),
3359 : errdetail("%s versus %s", inhdef->compression, newdef->compression)));
3360 : }
3361 :
3362 : /*
3363 : * Merge of not-null constraints = OR 'em together
3364 : */
3365 231 : inhdef->is_not_null |= newdef->is_not_null;
3366 :
3367 : /*
3368 : * Check for conflicts related to generated columns.
3369 : *
3370 : * If the parent column is generated, the child column will be made a
3371 : * generated column if it isn't already. If it is a generated column,
3372 : * we'll take its generation expression in preference to the parent's. We
3373 : * must check that the child column doesn't specify a default value or
3374 : * identity, which matches the rules for a single column in
3375 : * parse_utilcmd.c.
3376 : *
3377 : * Conversely, if the parent column is not generated, the child column
3378 : * can't be either. (We used to allow that, but it results in being able
3379 : * to override the generation expression via UPDATEs through the parent.)
3380 : */
3381 231 : if (inhdef->generated)
3382 : {
3383 41 : if (newdef->raw_default && !newdef->generated)
3384 8 : ereport(ERROR,
3385 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3386 : errmsg("column \"%s\" inherits from generated column but specifies default",
3387 : inhdef->colname)));
3388 33 : if (newdef->identity)
3389 8 : ereport(ERROR,
3390 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3391 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3392 : inhdef->colname)));
3393 : }
3394 : else
3395 : {
3396 190 : if (newdef->generated)
3397 8 : ereport(ERROR,
3398 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3399 : errmsg("child column \"%s\" specifies generation expression",
3400 : inhdef->colname),
3401 : errhint("A child table column cannot be generated unless its parent column is.")));
3402 : }
3403 :
3404 207 : if (inhdef->generated && newdef->generated && newdef->generated != inhdef->generated)
3405 8 : ereport(ERROR,
3406 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3407 : errmsg("column \"%s\" inherits from generated column of different kind",
3408 : inhdef->colname),
3409 : errdetail("Parent column is %s, child column is %s.",
3410 : inhdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3411 : newdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3412 :
3413 : /*
3414 : * If new def has a default, override previous default
3415 : */
3416 199 : if (newdef->raw_default != NULL)
3417 : {
3418 20 : inhdef->raw_default = newdef->raw_default;
3419 20 : inhdef->cooked_default = newdef->cooked_default;
3420 : }
3421 :
3422 : /* Mark the column as locally defined */
3423 199 : inhdef->is_local = true;
3424 199 : }
3425 :
3426 : /*
3427 : * MergeInheritedAttribute
3428 : * Merge given parent attribute definition into specified attribute
3429 : * inherited from the previous parents.
3430 : *
3431 : * Input arguments:
3432 : * 'inh_columns' is the list of previously inherited ColumnDefs.
3433 : * 'exist_attno' is the number the existing matching attribute in inh_columns.
3434 : * 'newdef' is the new parent column/attribute definition to be merged.
3435 : *
3436 : * The matching ColumnDef in 'inh_columns' list is modified and returned.
3437 : *
3438 : * Notes:
3439 : * - The attribute is merged according to the rules laid out in the prologue
3440 : * of MergeAttributes().
3441 : * - If matching inherited attribute exists but the new attribute can not be
3442 : * merged into it, the function throws respective errors.
3443 : * - A partition inherits from only a single parent. Hence this function is
3444 : * applicable only to a regular inheritance.
3445 : */
3446 : static ColumnDef *
3447 245 : MergeInheritedAttribute(List *inh_columns,
3448 : int exist_attno,
3449 : const ColumnDef *newdef)
3450 : {
3451 245 : char *attributeName = newdef->colname;
3452 : ColumnDef *prevdef;
3453 : Oid prevtypeid,
3454 : newtypeid;
3455 : int32 prevtypmod,
3456 : newtypmod;
3457 : Oid prevcollid,
3458 : newcollid;
3459 :
3460 245 : ereport(NOTICE,
3461 : (errmsg("merging multiple inherited definitions of column \"%s\"",
3462 : attributeName)));
3463 245 : prevdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3464 :
3465 : /*
3466 : * Must have the same type and typmod
3467 : */
3468 245 : typenameTypeIdAndMod(NULL, prevdef->typeName, &prevtypeid, &prevtypmod);
3469 245 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3470 245 : if (prevtypeid != newtypeid || prevtypmod != newtypmod)
3471 0 : ereport(ERROR,
3472 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3473 : errmsg("inherited column \"%s\" has a type conflict",
3474 : attributeName),
3475 : errdetail("%s versus %s",
3476 : format_type_with_typemod(prevtypeid, prevtypmod),
3477 : format_type_with_typemod(newtypeid, newtypmod))));
3478 :
3479 : /*
3480 : * Must have the same collation
3481 : */
3482 245 : prevcollid = GetColumnDefCollation(NULL, prevdef, prevtypeid);
3483 245 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3484 245 : if (prevcollid != newcollid)
3485 0 : ereport(ERROR,
3486 : (errcode(ERRCODE_COLLATION_MISMATCH),
3487 : errmsg("inherited column \"%s\" has a collation conflict",
3488 : attributeName),
3489 : errdetail("\"%s\" versus \"%s\"",
3490 : get_collation_name(prevcollid),
3491 : get_collation_name(newcollid))));
3492 :
3493 : /*
3494 : * Copy/check storage parameter
3495 : */
3496 245 : if (prevdef->storage == 0)
3497 0 : prevdef->storage = newdef->storage;
3498 245 : else if (prevdef->storage != newdef->storage)
3499 4 : ereport(ERROR,
3500 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3501 : errmsg("inherited column \"%s\" has a storage parameter conflict",
3502 : attributeName),
3503 : errdetail("%s versus %s",
3504 : storage_name(prevdef->storage),
3505 : storage_name(newdef->storage))));
3506 :
3507 : /*
3508 : * Copy/check compression parameter
3509 : */
3510 241 : if (prevdef->compression == NULL)
3511 229 : prevdef->compression = newdef->compression;
3512 12 : else if (newdef->compression != NULL)
3513 : {
3514 4 : if (strcmp(prevdef->compression, newdef->compression) != 0)
3515 4 : ereport(ERROR,
3516 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3517 : errmsg("column \"%s\" has a compression method conflict",
3518 : attributeName),
3519 : errdetail("%s versus %s",
3520 : prevdef->compression, newdef->compression)));
3521 : }
3522 :
3523 : /*
3524 : * Check for GENERATED conflicts
3525 : */
3526 237 : if (prevdef->generated != newdef->generated)
3527 16 : ereport(ERROR,
3528 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3529 : errmsg("inherited column \"%s\" has a generation conflict",
3530 : attributeName)));
3531 :
3532 : /*
3533 : * Default and other constraints are handled by the caller.
3534 : */
3535 :
3536 221 : if (pg_add_s16_overflow(prevdef->inhcount, 1,
3537 : &prevdef->inhcount))
3538 0 : ereport(ERROR,
3539 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3540 : errmsg("too many inheritance parents"));
3541 :
3542 221 : return prevdef;
3543 : }
3544 :
3545 : /*
3546 : * StoreCatalogInheritance
3547 : * Updates the system catalogs with proper inheritance information.
3548 : *
3549 : * supers is a list of the OIDs of the new relation's direct ancestors.
3550 : */
3551 : static void
3552 39061 : StoreCatalogInheritance(Oid relationId, List *supers,
3553 : bool child_is_partition)
3554 : {
3555 : Relation relation;
3556 : int32 seqNumber;
3557 : ListCell *entry;
3558 :
3559 : /*
3560 : * sanity checks
3561 : */
3562 : Assert(OidIsValid(relationId));
3563 :
3564 39061 : if (supers == NIL)
3565 31943 : return;
3566 :
3567 : /*
3568 : * Store INHERITS information in pg_inherits using direct ancestors only.
3569 : * Also enter dependencies on the direct ancestors, and make sure they are
3570 : * marked with relhassubclass = true.
3571 : *
3572 : * (Once upon a time, both direct and indirect ancestors were found here
3573 : * and then entered into pg_ipl. Since that catalog doesn't exist
3574 : * anymore, there's no need to look for indirect ancestors.)
3575 : */
3576 7118 : relation = table_open(InheritsRelationId, RowExclusiveLock);
3577 :
3578 7118 : seqNumber = 1;
3579 14458 : foreach(entry, supers)
3580 : {
3581 7340 : Oid parentOid = lfirst_oid(entry);
3582 :
3583 7340 : StoreCatalogInheritance1(relationId, parentOid, seqNumber, relation,
3584 : child_is_partition);
3585 7340 : seqNumber++;
3586 : }
3587 :
3588 7118 : table_close(relation, RowExclusiveLock);
3589 : }
3590 :
3591 : /*
3592 : * Make catalog entries showing relationId as being an inheritance child
3593 : * of parentOid. inhRelation is the already-opened pg_inherits catalog.
3594 : */
3595 : static void
3596 9383 : StoreCatalogInheritance1(Oid relationId, Oid parentOid,
3597 : int32 seqNumber, Relation inhRelation,
3598 : bool child_is_partition)
3599 : {
3600 : ObjectAddress childobject,
3601 : parentobject;
3602 :
3603 : /* store the pg_inherits row */
3604 9383 : StoreSingleInheritance(relationId, parentOid, seqNumber);
3605 :
3606 : /*
3607 : * Store a dependency too
3608 : */
3609 9383 : parentobject.classId = RelationRelationId;
3610 9383 : parentobject.objectId = parentOid;
3611 9383 : parentobject.objectSubId = 0;
3612 9383 : childobject.classId = RelationRelationId;
3613 9383 : childobject.objectId = relationId;
3614 9383 : childobject.objectSubId = 0;
3615 :
3616 9383 : recordDependencyOn(&childobject, &parentobject,
3617 : child_dependency_type(child_is_partition));
3618 :
3619 : /*
3620 : * Post creation hook of this inheritance. Since object_access_hook
3621 : * doesn't take multiple object identifiers, we relay oid of parent
3622 : * relation using auxiliary_id argument.
3623 : */
3624 9383 : InvokeObjectPostAlterHookArg(InheritsRelationId,
3625 : relationId, 0,
3626 : parentOid, false);
3627 :
3628 : /*
3629 : * Mark the parent as having subclasses.
3630 : */
3631 9383 : SetRelationHasSubclass(parentOid, true);
3632 9383 : }
3633 :
3634 : /*
3635 : * Look for an existing column entry with the given name.
3636 : *
3637 : * Returns the index (starting with 1) if attribute already exists in columns,
3638 : * 0 if it doesn't.
3639 : */
3640 : static int
3641 16243 : findAttrByName(const char *attributeName, const List *columns)
3642 : {
3643 : ListCell *lc;
3644 16243 : int i = 1;
3645 :
3646 29659 : foreach(lc, columns)
3647 : {
3648 13912 : if (strcmp(attributeName, lfirst_node(ColumnDef, lc)->colname) == 0)
3649 496 : return i;
3650 :
3651 13416 : i++;
3652 : }
3653 15747 : return 0;
3654 : }
3655 :
3656 :
3657 : /*
3658 : * SetRelationHasSubclass
3659 : * Set the value of the relation's relhassubclass field in pg_class.
3660 : *
3661 : * It's always safe to set this field to true, because all SQL commands are
3662 : * ready to see true and then find no children. On the other hand, commands
3663 : * generally assume zero children if this is false.
3664 : *
3665 : * Caller must hold any self-exclusive lock until end of transaction. If the
3666 : * new value is false, caller must have acquired that lock before reading the
3667 : * evidence that justified the false value. That way, it properly waits if
3668 : * another backend is simultaneously concluding no need to change the tuple
3669 : * (new and old values are true).
3670 : *
3671 : * NOTE: an important side-effect of this operation is that an SI invalidation
3672 : * message is sent out to all backends --- including me --- causing plans
3673 : * referencing the relation to be rebuilt with the new list of children.
3674 : * This must happen even if we find that no change is needed in the pg_class
3675 : * row.
3676 : */
3677 : void
3678 11816 : SetRelationHasSubclass(Oid relationId, bool relhassubclass)
3679 : {
3680 : Relation relationRelation;
3681 : HeapTuple tuple;
3682 : Form_pg_class classtuple;
3683 :
3684 : Assert(CheckRelationOidLockedByMe(relationId,
3685 : ShareUpdateExclusiveLock, false) ||
3686 : CheckRelationOidLockedByMe(relationId,
3687 : ShareRowExclusiveLock, true));
3688 :
3689 : /*
3690 : * Fetch a modifiable copy of the tuple, modify it, update pg_class.
3691 : */
3692 11816 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
3693 11816 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
3694 11816 : if (!HeapTupleIsValid(tuple))
3695 0 : elog(ERROR, "cache lookup failed for relation %u", relationId);
3696 11816 : classtuple = (Form_pg_class) GETSTRUCT(tuple);
3697 :
3698 11816 : if (classtuple->relhassubclass != relhassubclass)
3699 : {
3700 5447 : classtuple->relhassubclass = relhassubclass;
3701 5447 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
3702 : }
3703 : else
3704 : {
3705 : /* no need to change tuple, but force relcache rebuild anyway */
3706 6369 : CacheInvalidateRelcacheByTuple(tuple);
3707 : }
3708 :
3709 11816 : heap_freetuple(tuple);
3710 11816 : table_close(relationRelation, RowExclusiveLock);
3711 11816 : }
3712 :
3713 : /*
3714 : * CheckRelationTableSpaceMove
3715 : * Check if relation can be moved to new tablespace.
3716 : *
3717 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3718 : *
3719 : * Returns true if the relation can be moved to the new tablespace; raises
3720 : * an error if it is not possible to do the move; returns false if the move
3721 : * would have no effect.
3722 : */
3723 : bool
3724 151 : CheckRelationTableSpaceMove(Relation rel, Oid newTableSpaceId)
3725 : {
3726 : Oid oldTableSpaceId;
3727 :
3728 : /*
3729 : * No work if no change in tablespace. Note that MyDatabaseTableSpace is
3730 : * stored as 0.
3731 : */
3732 151 : oldTableSpaceId = rel->rd_rel->reltablespace;
3733 151 : if (newTableSpaceId == oldTableSpaceId ||
3734 146 : (newTableSpaceId == MyDatabaseTableSpace && oldTableSpaceId == 0))
3735 10 : return false;
3736 :
3737 : /*
3738 : * We cannot support moving mapped relations into different tablespaces.
3739 : * (In particular this eliminates all shared catalogs.)
3740 : */
3741 141 : if (RelationIsMapped(rel))
3742 0 : ereport(ERROR,
3743 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3744 : errmsg("cannot move system relation \"%s\"",
3745 : RelationGetRelationName(rel))));
3746 :
3747 : /* Cannot move a non-shared relation into pg_global */
3748 141 : if (newTableSpaceId == GLOBALTABLESPACE_OID)
3749 8 : ereport(ERROR,
3750 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3751 : errmsg("only shared relations can be placed in pg_global tablespace")));
3752 :
3753 : /*
3754 : * Do not allow moving temp tables of other backends ... their local
3755 : * buffer manager is not going to cope.
3756 : */
3757 133 : if (RELATION_IS_OTHER_TEMP(rel))
3758 0 : ereport(ERROR,
3759 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3760 : errmsg("cannot move temporary tables of other sessions")));
3761 :
3762 133 : return true;
3763 : }
3764 :
3765 : /*
3766 : * SetRelationTableSpace
3767 : * Set new reltablespace and relfilenumber in pg_class entry.
3768 : *
3769 : * newTableSpaceId is the new tablespace for the relation, and
3770 : * newRelFilenumber its new filenumber. If newRelFilenumber is
3771 : * InvalidRelFileNumber, this field is not updated.
3772 : *
3773 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3774 : *
3775 : * The caller of this routine had better check if a relation can be
3776 : * moved to this new tablespace by calling CheckRelationTableSpaceMove()
3777 : * first, and is responsible for making the change visible with
3778 : * CommandCounterIncrement().
3779 : */
3780 : void
3781 133 : SetRelationTableSpace(Relation rel,
3782 : Oid newTableSpaceId,
3783 : RelFileNumber newRelFilenumber)
3784 : {
3785 : Relation pg_class;
3786 : HeapTuple tuple;
3787 : ItemPointerData otid;
3788 : Form_pg_class rd_rel;
3789 133 : Oid reloid = RelationGetRelid(rel);
3790 :
3791 : Assert(CheckRelationTableSpaceMove(rel, newTableSpaceId));
3792 :
3793 : /* Get a modifiable copy of the relation's pg_class row. */
3794 133 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
3795 :
3796 133 : tuple = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(reloid));
3797 133 : if (!HeapTupleIsValid(tuple))
3798 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
3799 133 : otid = tuple->t_self;
3800 133 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
3801 :
3802 : /* Update the pg_class row. */
3803 266 : rd_rel->reltablespace = (newTableSpaceId == MyDatabaseTableSpace) ?
3804 133 : InvalidOid : newTableSpaceId;
3805 133 : if (RelFileNumberIsValid(newRelFilenumber))
3806 104 : rd_rel->relfilenode = newRelFilenumber;
3807 133 : CatalogTupleUpdate(pg_class, &otid, tuple);
3808 133 : UnlockTuple(pg_class, &otid, InplaceUpdateTupleLock);
3809 :
3810 : /*
3811 : * Record dependency on tablespace. This is only required for relations
3812 : * that have no physical storage.
3813 : */
3814 133 : if (!RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
3815 20 : changeDependencyOnTablespace(RelationRelationId, reloid,
3816 : rd_rel->reltablespace);
3817 :
3818 133 : heap_freetuple(tuple);
3819 133 : table_close(pg_class, RowExclusiveLock);
3820 133 : }
3821 :
3822 : /*
3823 : * renameatt_check - basic sanity checks before attribute rename
3824 : */
3825 : static void
3826 669 : renameatt_check(Oid myrelid, Form_pg_class classform, bool recursing)
3827 : {
3828 669 : char relkind = classform->relkind;
3829 :
3830 669 : if (classform->reloftype && !recursing)
3831 4 : ereport(ERROR,
3832 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3833 : errmsg("cannot rename column of typed table")));
3834 :
3835 : /*
3836 : * Renaming the columns of sequences or toast tables doesn't actually
3837 : * break anything from the system's point of view, since internal
3838 : * references are by attnum. But it doesn't seem right to allow users to
3839 : * change names that are hardcoded into the system, hence the following
3840 : * restriction.
3841 : */
3842 665 : if (relkind != RELKIND_RELATION &&
3843 56 : relkind != RELKIND_VIEW &&
3844 56 : relkind != RELKIND_MATVIEW &&
3845 24 : relkind != RELKIND_COMPOSITE_TYPE &&
3846 24 : relkind != RELKIND_INDEX &&
3847 24 : relkind != RELKIND_PARTITIONED_INDEX &&
3848 0 : relkind != RELKIND_FOREIGN_TABLE &&
3849 : relkind != RELKIND_PARTITIONED_TABLE)
3850 0 : ereport(ERROR,
3851 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3852 : errmsg("cannot rename columns of relation \"%s\"",
3853 : NameStr(classform->relname)),
3854 : errdetail_relkind_not_supported(relkind)));
3855 :
3856 : /*
3857 : * permissions checking. only the owner of a class can change its schema.
3858 : */
3859 665 : if (!object_ownercheck(RelationRelationId, myrelid, GetUserId()))
3860 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(myrelid)),
3861 0 : NameStr(classform->relname));
3862 665 : if (!allowSystemTableMods && IsSystemClass(myrelid, classform))
3863 1 : ereport(ERROR,
3864 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3865 : errmsg("permission denied: \"%s\" is a system catalog",
3866 : NameStr(classform->relname))));
3867 664 : }
3868 :
3869 : /*
3870 : * renameatt_internal - workhorse for renameatt
3871 : *
3872 : * Return value is the attribute number in the 'myrelid' relation.
3873 : */
3874 : static AttrNumber
3875 366 : renameatt_internal(Oid myrelid,
3876 : const char *oldattname,
3877 : const char *newattname,
3878 : bool recurse,
3879 : bool recursing,
3880 : int expected_parents,
3881 : DropBehavior behavior)
3882 : {
3883 : Relation targetrelation;
3884 : Relation attrelation;
3885 : HeapTuple atttup;
3886 : Form_pg_attribute attform;
3887 : AttrNumber attnum;
3888 :
3889 : /*
3890 : * Grab an exclusive lock on the target table, which we will NOT release
3891 : * until end of transaction.
3892 : */
3893 366 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
3894 366 : renameatt_check(myrelid, RelationGetForm(targetrelation), recursing);
3895 :
3896 : /*
3897 : * if the 'recurse' flag is set then we are supposed to rename this
3898 : * attribute in all classes that inherit from 'relname' (as well as in
3899 : * 'relname').
3900 : *
3901 : * any permissions or problems with duplicate attributes will cause the
3902 : * whole transaction to abort, which is what we want -- all or nothing.
3903 : */
3904 366 : if (recurse)
3905 : {
3906 : List *child_oids,
3907 : *child_numparents;
3908 : ListCell *lo,
3909 : *li;
3910 :
3911 : /*
3912 : * we need the number of parents for each child so that the recursive
3913 : * calls to renameatt() can determine whether there are any parents
3914 : * outside the inheritance hierarchy being processed.
3915 : */
3916 164 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
3917 : &child_numparents);
3918 :
3919 : /*
3920 : * find_all_inheritors does the recursive search of the inheritance
3921 : * hierarchy, so all we have to do is process all of the relids in the
3922 : * list that it returns.
3923 : */
3924 486 : forboth(lo, child_oids, li, child_numparents)
3925 : {
3926 342 : Oid childrelid = lfirst_oid(lo);
3927 342 : int numparents = lfirst_int(li);
3928 :
3929 342 : if (childrelid == myrelid)
3930 164 : continue;
3931 : /* note we need not recurse again */
3932 178 : renameatt_internal(childrelid, oldattname, newattname, false, true, numparents, behavior);
3933 : }
3934 : }
3935 : else
3936 : {
3937 : /*
3938 : * If we are told not to recurse, there had better not be any child
3939 : * tables; else the rename would put them out of step.
3940 : *
3941 : * expected_parents will only be 0 if we are not already recursing.
3942 : */
3943 226 : if (expected_parents == 0 &&
3944 24 : find_inheritance_children(myrelid, NoLock) != NIL)
3945 8 : ereport(ERROR,
3946 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3947 : errmsg("inherited column \"%s\" must be renamed in child tables too",
3948 : oldattname)));
3949 : }
3950 :
3951 : /* rename attributes in typed tables of composite type */
3952 338 : if (targetrelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
3953 : {
3954 : List *child_oids;
3955 : ListCell *lo;
3956 :
3957 16 : child_oids = find_typed_table_dependencies(targetrelation->rd_rel->reltype,
3958 16 : RelationGetRelationName(targetrelation),
3959 : behavior);
3960 :
3961 16 : foreach(lo, child_oids)
3962 4 : renameatt_internal(lfirst_oid(lo), oldattname, newattname, true, true, 0, behavior);
3963 : }
3964 :
3965 334 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
3966 :
3967 334 : atttup = SearchSysCacheCopyAttName(myrelid, oldattname);
3968 334 : if (!HeapTupleIsValid(atttup))
3969 16 : ereport(ERROR,
3970 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3971 : errmsg("column \"%s\" does not exist",
3972 : oldattname)));
3973 318 : attform = (Form_pg_attribute) GETSTRUCT(atttup);
3974 :
3975 318 : attnum = attform->attnum;
3976 318 : if (attnum <= 0)
3977 0 : ereport(ERROR,
3978 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3979 : errmsg("cannot rename system column \"%s\"",
3980 : oldattname)));
3981 :
3982 : /*
3983 : * if the attribute is inherited, forbid the renaming. if this is a
3984 : * top-level call to renameatt(), then expected_parents will be 0, so the
3985 : * effect of this code will be to prohibit the renaming if the attribute
3986 : * is inherited at all. if this is a recursive call to renameatt(),
3987 : * expected_parents will be the number of parents the current relation has
3988 : * within the inheritance hierarchy being processed, so we'll prohibit the
3989 : * renaming only if there are additional parents from elsewhere.
3990 : */
3991 318 : if (attform->attinhcount > expected_parents)
3992 20 : ereport(ERROR,
3993 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3994 : errmsg("cannot rename inherited column \"%s\"",
3995 : oldattname)));
3996 :
3997 : /* new name should not already exist */
3998 298 : (void) check_for_column_name_collision(targetrelation, newattname, false);
3999 :
4000 : /* apply the update */
4001 290 : namestrcpy(&(attform->attname), newattname);
4002 :
4003 290 : CatalogTupleUpdate(attrelation, &atttup->t_self, atttup);
4004 :
4005 290 : InvokeObjectPostAlterHook(RelationRelationId, myrelid, attnum);
4006 :
4007 290 : heap_freetuple(atttup);
4008 :
4009 290 : table_close(attrelation, RowExclusiveLock);
4010 :
4011 290 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4012 :
4013 290 : return attnum;
4014 : }
4015 :
4016 : /*
4017 : * Perform permissions and integrity checks before acquiring a relation lock.
4018 : */
4019 : static void
4020 271 : RangeVarCallbackForRenameAttribute(const RangeVar *rv, Oid relid, Oid oldrelid,
4021 : void *arg)
4022 : {
4023 : HeapTuple tuple;
4024 : Form_pg_class form;
4025 :
4026 271 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
4027 271 : if (!HeapTupleIsValid(tuple))
4028 24 : return; /* concurrently dropped */
4029 247 : form = (Form_pg_class) GETSTRUCT(tuple);
4030 247 : renameatt_check(relid, form, false);
4031 242 : ReleaseSysCache(tuple);
4032 : }
4033 :
4034 : /*
4035 : * renameatt - changes the name of an attribute in a relation
4036 : *
4037 : * The returned ObjectAddress is that of the renamed column.
4038 : */
4039 : ObjectAddress
4040 209 : renameatt(RenameStmt *stmt)
4041 : {
4042 : Oid relid;
4043 : AttrNumber attnum;
4044 : ObjectAddress address;
4045 :
4046 : /* lock level taken here should match renameatt_internal */
4047 209 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4048 209 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4049 : RangeVarCallbackForRenameAttribute,
4050 : NULL);
4051 :
4052 200 : if (!OidIsValid(relid))
4053 : {
4054 16 : ereport(NOTICE,
4055 : (errmsg("relation \"%s\" does not exist, skipping",
4056 : stmt->relation->relname)));
4057 16 : return InvalidObjectAddress;
4058 : }
4059 :
4060 : attnum =
4061 184 : renameatt_internal(relid,
4062 184 : stmt->subname, /* old att name */
4063 184 : stmt->newname, /* new att name */
4064 184 : stmt->relation->inh, /* recursive? */
4065 : false, /* recursing? */
4066 : 0, /* expected inhcount */
4067 : stmt->behavior);
4068 :
4069 128 : ObjectAddressSubSet(address, RelationRelationId, relid, attnum);
4070 :
4071 128 : return address;
4072 : }
4073 :
4074 : /*
4075 : * same logic as renameatt_internal
4076 : */
4077 : static ObjectAddress
4078 60 : rename_constraint_internal(Oid myrelid,
4079 : Oid mytypid,
4080 : const char *oldconname,
4081 : const char *newconname,
4082 : bool recurse,
4083 : bool recursing,
4084 : int expected_parents)
4085 : {
4086 60 : Relation targetrelation = NULL;
4087 : Oid constraintOid;
4088 : HeapTuple tuple;
4089 : Form_pg_constraint con;
4090 : ObjectAddress address;
4091 :
4092 : Assert(!myrelid || !mytypid);
4093 :
4094 60 : if (mytypid)
4095 : {
4096 4 : constraintOid = get_domain_constraint_oid(mytypid, oldconname, false);
4097 : }
4098 : else
4099 : {
4100 56 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
4101 :
4102 : /*
4103 : * don't tell it whether we're recursing; we allow changing typed
4104 : * tables here
4105 : */
4106 56 : renameatt_check(myrelid, RelationGetForm(targetrelation), false);
4107 :
4108 56 : constraintOid = get_relation_constraint_oid(myrelid, oldconname, false);
4109 : }
4110 :
4111 60 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
4112 60 : if (!HeapTupleIsValid(tuple))
4113 0 : elog(ERROR, "cache lookup failed for constraint %u",
4114 : constraintOid);
4115 60 : con = (Form_pg_constraint) GETSTRUCT(tuple);
4116 :
4117 60 : if (myrelid &&
4118 56 : (con->contype == CONSTRAINT_CHECK ||
4119 16 : con->contype == CONSTRAINT_NOTNULL) &&
4120 44 : !con->connoinherit)
4121 : {
4122 36 : if (recurse)
4123 : {
4124 : List *child_oids,
4125 : *child_numparents;
4126 : ListCell *lo,
4127 : *li;
4128 :
4129 24 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
4130 : &child_numparents);
4131 :
4132 56 : forboth(lo, child_oids, li, child_numparents)
4133 : {
4134 32 : Oid childrelid = lfirst_oid(lo);
4135 32 : int numparents = lfirst_int(li);
4136 :
4137 32 : if (childrelid == myrelid)
4138 24 : continue;
4139 :
4140 8 : rename_constraint_internal(childrelid, InvalidOid, oldconname, newconname, false, true, numparents);
4141 : }
4142 : }
4143 : else
4144 : {
4145 16 : if (expected_parents == 0 &&
4146 4 : find_inheritance_children(myrelid, NoLock) != NIL)
4147 4 : ereport(ERROR,
4148 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4149 : errmsg("inherited constraint \"%s\" must be renamed in child tables too",
4150 : oldconname)));
4151 : }
4152 :
4153 32 : if (con->coninhcount > expected_parents)
4154 4 : ereport(ERROR,
4155 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4156 : errmsg("cannot rename inherited constraint \"%s\"",
4157 : oldconname)));
4158 : }
4159 :
4160 52 : if (con->conindid
4161 12 : && (con->contype == CONSTRAINT_PRIMARY
4162 4 : || con->contype == CONSTRAINT_UNIQUE
4163 0 : || con->contype == CONSTRAINT_EXCLUSION))
4164 : /* rename the index; this renames the constraint as well */
4165 12 : RenameRelationInternal(con->conindid, newconname, false, true);
4166 : else
4167 40 : RenameConstraintById(constraintOid, newconname);
4168 :
4169 52 : ObjectAddressSet(address, ConstraintRelationId, constraintOid);
4170 :
4171 52 : ReleaseSysCache(tuple);
4172 :
4173 52 : if (targetrelation)
4174 : {
4175 : /*
4176 : * Invalidate relcache so as others can see the new constraint name.
4177 : */
4178 48 : CacheInvalidateRelcache(targetrelation);
4179 :
4180 48 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4181 : }
4182 :
4183 52 : return address;
4184 : }
4185 :
4186 : ObjectAddress
4187 56 : RenameConstraint(RenameStmt *stmt)
4188 : {
4189 56 : Oid relid = InvalidOid;
4190 56 : Oid typid = InvalidOid;
4191 :
4192 56 : if (stmt->renameType == OBJECT_DOMCONSTRAINT)
4193 : {
4194 : Relation rel;
4195 : HeapTuple tup;
4196 :
4197 4 : typid = typenameTypeId(NULL, makeTypeNameFromNameList(castNode(List, stmt->object)));
4198 4 : rel = table_open(TypeRelationId, RowExclusiveLock);
4199 4 : tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
4200 4 : if (!HeapTupleIsValid(tup))
4201 0 : elog(ERROR, "cache lookup failed for type %u", typid);
4202 4 : checkDomainOwner(tup);
4203 4 : ReleaseSysCache(tup);
4204 4 : table_close(rel, NoLock);
4205 : }
4206 : else
4207 : {
4208 : /* lock level taken here should match rename_constraint_internal */
4209 52 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4210 52 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4211 : RangeVarCallbackForRenameAttribute,
4212 : NULL);
4213 52 : if (!OidIsValid(relid))
4214 : {
4215 4 : ereport(NOTICE,
4216 : (errmsg("relation \"%s\" does not exist, skipping",
4217 : stmt->relation->relname)));
4218 4 : return InvalidObjectAddress;
4219 : }
4220 : }
4221 :
4222 : return
4223 52 : rename_constraint_internal(relid, typid,
4224 52 : stmt->subname,
4225 52 : stmt->newname,
4226 100 : (stmt->relation &&
4227 48 : stmt->relation->inh), /* recursive? */
4228 : false, /* recursing? */
4229 52 : 0 /* expected inhcount */ );
4230 : }
4231 :
4232 : /*
4233 : * Execute ALTER TABLE/INDEX/SEQUENCE/VIEW/MATERIALIZED VIEW/FOREIGN TABLE/PROPERTY GRAPH
4234 : * RENAME
4235 : */
4236 : ObjectAddress
4237 327 : RenameRelation(RenameStmt *stmt)
4238 : {
4239 327 : bool is_index_stmt = stmt->renameType == OBJECT_INDEX;
4240 : Oid relid;
4241 : ObjectAddress address;
4242 :
4243 : /*
4244 : * Grab an exclusive lock on the target table, index, sequence, view,
4245 : * materialized view, or foreign table, which we will NOT release until
4246 : * end of transaction.
4247 : *
4248 : * Lock level used here should match RenameRelationInternal, to avoid lock
4249 : * escalation. However, because ALTER INDEX can be used with any relation
4250 : * type, we mustn't believe without verification.
4251 : */
4252 : for (;;)
4253 8 : {
4254 : LOCKMODE lockmode;
4255 : char relkind;
4256 : bool obj_is_index;
4257 :
4258 335 : lockmode = is_index_stmt ? ShareUpdateExclusiveLock : AccessExclusiveLock;
4259 :
4260 335 : relid = RangeVarGetRelidExtended(stmt->relation, lockmode,
4261 335 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4262 : RangeVarCallbackForAlterRelation,
4263 : stmt);
4264 :
4265 298 : if (!OidIsValid(relid))
4266 : {
4267 12 : ereport(NOTICE,
4268 : (errmsg("relation \"%s\" does not exist, skipping",
4269 : stmt->relation->relname)));
4270 12 : return InvalidObjectAddress;
4271 : }
4272 :
4273 : /*
4274 : * We allow mismatched statement and object types (e.g., ALTER INDEX
4275 : * to rename a table), but we might've used the wrong lock level. If
4276 : * that happens, retry with the correct lock level. We don't bother
4277 : * if we already acquired AccessExclusiveLock with an index, however.
4278 : */
4279 286 : relkind = get_rel_relkind(relid);
4280 286 : obj_is_index = (relkind == RELKIND_INDEX ||
4281 : relkind == RELKIND_PARTITIONED_INDEX);
4282 286 : if (obj_is_index || is_index_stmt == obj_is_index)
4283 : break;
4284 :
4285 8 : UnlockRelationOid(relid, lockmode);
4286 8 : is_index_stmt = obj_is_index;
4287 : }
4288 :
4289 : /* Do the work */
4290 278 : RenameRelationInternal(relid, stmt->newname, false, is_index_stmt);
4291 :
4292 266 : ObjectAddressSet(address, RelationRelationId, relid);
4293 :
4294 266 : return address;
4295 : }
4296 :
4297 : /*
4298 : * RenameRelationInternal - change the name of a relation
4299 : */
4300 : void
4301 1102 : RenameRelationInternal(Oid myrelid, const char *newrelname, bool is_internal, bool is_index)
4302 : {
4303 : Relation targetrelation;
4304 : Relation relrelation; /* for RELATION relation */
4305 : ItemPointerData otid;
4306 : HeapTuple reltup;
4307 : Form_pg_class relform;
4308 : Oid namespaceId;
4309 :
4310 : /*
4311 : * Grab a lock on the target relation, which we will NOT release until end
4312 : * of transaction. We need at least a self-exclusive lock so that
4313 : * concurrent DDL doesn't overwrite the rename if they start updating
4314 : * while still seeing the old version. The lock also guards against
4315 : * triggering relcache reloads in concurrent sessions, which might not
4316 : * handle this information changing under them. For indexes, we can use a
4317 : * reduced lock level because RelationReloadIndexInfo() handles indexes
4318 : * specially.
4319 : */
4320 1102 : targetrelation = relation_open(myrelid, is_index ? ShareUpdateExclusiveLock : AccessExclusiveLock);
4321 1102 : namespaceId = RelationGetNamespace(targetrelation);
4322 :
4323 : /*
4324 : * Find relation's pg_class tuple, and make sure newrelname isn't in use.
4325 : */
4326 1102 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4327 :
4328 1102 : reltup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(myrelid));
4329 1102 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4330 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4331 1102 : otid = reltup->t_self;
4332 1102 : relform = (Form_pg_class) GETSTRUCT(reltup);
4333 :
4334 1102 : if (get_relname_relid(newrelname, namespaceId) != InvalidOid)
4335 12 : ereport(ERROR,
4336 : (errcode(ERRCODE_DUPLICATE_TABLE),
4337 : errmsg("relation \"%s\" already exists",
4338 : newrelname)));
4339 :
4340 : /*
4341 : * RenameRelation is careful not to believe the caller's idea of the
4342 : * relation kind being handled. We don't have to worry about this, but
4343 : * let's not be totally oblivious to it. We can process an index as
4344 : * not-an-index, but not the other way around.
4345 : */
4346 : Assert(!is_index ||
4347 : is_index == (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4348 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX));
4349 :
4350 : /*
4351 : * Update pg_class tuple with new relname. (Scribbling on reltup is OK
4352 : * because it's a copy...)
4353 : */
4354 1090 : namestrcpy(&(relform->relname), newrelname);
4355 :
4356 1090 : CatalogTupleUpdate(relrelation, &otid, reltup);
4357 1090 : UnlockTuple(relrelation, &otid, InplaceUpdateTupleLock);
4358 :
4359 1090 : InvokeObjectPostAlterHookArg(RelationRelationId, myrelid, 0,
4360 : InvalidOid, is_internal);
4361 :
4362 1090 : heap_freetuple(reltup);
4363 1090 : table_close(relrelation, RowExclusiveLock);
4364 :
4365 : /*
4366 : * Also rename the associated type, if any.
4367 : */
4368 1090 : if (OidIsValid(targetrelation->rd_rel->reltype))
4369 144 : RenameTypeInternal(targetrelation->rd_rel->reltype,
4370 : newrelname, namespaceId);
4371 :
4372 : /*
4373 : * Also rename the associated constraint, if any.
4374 : */
4375 1090 : if (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4376 603 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
4377 : {
4378 499 : Oid constraintId = get_index_constraint(myrelid);
4379 :
4380 499 : if (OidIsValid(constraintId))
4381 24 : RenameConstraintById(constraintId, newrelname);
4382 : }
4383 :
4384 : /*
4385 : * Close rel, but keep lock!
4386 : */
4387 1090 : relation_close(targetrelation, NoLock);
4388 1090 : }
4389 :
4390 : /*
4391 : * ResetRelRewrite - reset relrewrite
4392 : */
4393 : void
4394 378 : ResetRelRewrite(Oid myrelid)
4395 : {
4396 : Relation relrelation; /* for RELATION relation */
4397 : HeapTuple reltup;
4398 : Form_pg_class relform;
4399 :
4400 : /*
4401 : * Find relation's pg_class tuple.
4402 : */
4403 378 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4404 :
4405 378 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
4406 378 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4407 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4408 378 : relform = (Form_pg_class) GETSTRUCT(reltup);
4409 :
4410 : /*
4411 : * Update pg_class tuple.
4412 : */
4413 378 : relform->relrewrite = InvalidOid;
4414 :
4415 378 : CatalogTupleUpdate(relrelation, &reltup->t_self, reltup);
4416 :
4417 378 : heap_freetuple(reltup);
4418 378 : table_close(relrelation, RowExclusiveLock);
4419 378 : }
4420 :
4421 : /*
4422 : * Disallow ALTER TABLE (and similar commands) when the current backend has
4423 : * any open reference to the target table besides the one just acquired by
4424 : * the calling command; this implies there's an open cursor or active plan.
4425 : * We need this check because our lock doesn't protect us against stomping
4426 : * on our own foot, only other people's feet!
4427 : *
4428 : * For ALTER TABLE, the only case known to cause serious trouble is ALTER
4429 : * COLUMN TYPE, and some changes are obviously pretty benign, so this could
4430 : * possibly be relaxed to only error out for certain types of alterations.
4431 : * But the use-case for allowing any of these things is not obvious, so we
4432 : * won't work hard at it for now.
4433 : *
4434 : * We also reject these commands if there are any pending AFTER trigger events
4435 : * for the rel. This is certainly necessary for the rewriting variants of
4436 : * ALTER TABLE, because they don't preserve tuple TIDs and so the pending
4437 : * events would try to fetch the wrong tuples. It might be overly cautious
4438 : * in other cases, but again it seems better to err on the side of paranoia.
4439 : *
4440 : * REINDEX calls this with "rel" referencing the index to be rebuilt; here
4441 : * we are worried about active indexscans on the index. The trigger-event
4442 : * check can be skipped, since we are doing no damage to the parent table.
4443 : *
4444 : * The statement name (eg, "ALTER TABLE") is passed for use in error messages.
4445 : */
4446 : void
4447 110026 : CheckTableNotInUse(Relation rel, const char *stmt)
4448 : {
4449 : int expected_refcnt;
4450 :
4451 110026 : expected_refcnt = rel->rd_isnailed ? 2 : 1;
4452 110026 : if (rel->rd_refcnt != expected_refcnt)
4453 28 : ereport(ERROR,
4454 : (errcode(ERRCODE_OBJECT_IN_USE),
4455 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4456 : errmsg("cannot %s \"%s\" because it is being used by active queries in this session",
4457 : stmt, RelationGetRelationName(rel))));
4458 :
4459 109998 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
4460 179818 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
4461 89186 : AfterTriggerPendingOnRel(RelationGetRelid(rel)))
4462 12 : ereport(ERROR,
4463 : (errcode(ERRCODE_OBJECT_IN_USE),
4464 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4465 : errmsg("cannot %s \"%s\" because it has pending trigger events",
4466 : stmt, RelationGetRelationName(rel))));
4467 109986 : }
4468 :
4469 : /*
4470 : * CheckAlterTableIsSafe
4471 : * Verify that it's safe to allow ALTER TABLE on this relation.
4472 : *
4473 : * This consists of CheckTableNotInUse() plus a check that the relation
4474 : * isn't another session's temp table. We must split out the temp-table
4475 : * check because there are callers of CheckTableNotInUse() that don't want
4476 : * that, notably DROP TABLE. (We must allow DROP or we couldn't clean out
4477 : * an orphaned temp schema.) Compare truncate_check_activity().
4478 : */
4479 : static void
4480 38457 : CheckAlterTableIsSafe(Relation rel)
4481 : {
4482 : /*
4483 : * Don't allow ALTER on temp tables of other backends. Their local buffer
4484 : * manager is not going to cope if we need to change the table's contents.
4485 : * Even if we don't, there may be optimizations that assume temp tables
4486 : * aren't subject to such interference.
4487 : */
4488 38457 : if (RELATION_IS_OTHER_TEMP(rel))
4489 0 : ereport(ERROR,
4490 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4491 : errmsg("cannot alter temporary tables of other sessions")));
4492 :
4493 : /*
4494 : * Also check for active uses of the relation in the current transaction,
4495 : * including open scans and pending AFTER trigger events.
4496 : */
4497 38457 : CheckTableNotInUse(rel, "ALTER TABLE");
4498 38433 : }
4499 :
4500 : /*
4501 : * AlterTableLookupRelation
4502 : * Look up, and lock, the OID for the relation named by an alter table
4503 : * statement.
4504 : */
4505 : Oid
4506 20650 : AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
4507 : {
4508 41235 : return RangeVarGetRelidExtended(stmt->relation, lockmode,
4509 20650 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4510 : RangeVarCallbackForAlterRelation,
4511 : stmt);
4512 : }
4513 :
4514 : /*
4515 : * AlterTable
4516 : * Execute ALTER TABLE, which can be a list of subcommands
4517 : *
4518 : * ALTER TABLE is performed in three phases:
4519 : * 1. Examine subcommands and perform pre-transformation checking.
4520 : * 2. Validate and transform subcommands, and update system catalogs.
4521 : * 3. Scan table(s) to check new constraints, and optionally recopy
4522 : * the data into new table(s).
4523 : * Phase 3 is not performed unless one or more of the subcommands requires
4524 : * it. The intention of this design is to allow multiple independent
4525 : * updates of the table schema to be performed with only one pass over the
4526 : * data.
4527 : *
4528 : * ATPrepCmd performs phase 1. A "work queue" entry is created for
4529 : * each table to be affected (there may be multiple affected tables if the
4530 : * commands traverse a table inheritance hierarchy). Also we do preliminary
4531 : * validation of the subcommands. Because earlier subcommands may change
4532 : * the catalog state seen by later commands, there are limits to what can
4533 : * be done in this phase. Generally, this phase acquires table locks,
4534 : * checks permissions and relkind, and recurses to find child tables.
4535 : *
4536 : * ATRewriteCatalogs performs phase 2 for each affected table.
4537 : * Certain subcommands need to be performed before others to avoid
4538 : * unnecessary conflicts; for example, DROP COLUMN should come before
4539 : * ADD COLUMN. Therefore phase 1 divides the subcommands into multiple
4540 : * lists, one for each logical "pass" of phase 2.
4541 : *
4542 : * ATRewriteTables performs phase 3 for those tables that need it.
4543 : *
4544 : * For most subcommand types, phases 2 and 3 do no explicit recursion,
4545 : * since phase 1 already does it. However, for certain subcommand types
4546 : * it is only possible to determine how to recurse at phase 2 time; for
4547 : * those cases, phase 1 sets the cmd->recurse flag.
4548 : *
4549 : * Thanks to the magic of MVCC, an error anywhere along the way rolls back
4550 : * the whole operation; we don't have to do anything special to clean up.
4551 : *
4552 : * The caller must lock the relation, with an appropriate lock level
4553 : * for the subcommands requested, using AlterTableGetLockLevel(stmt->cmds)
4554 : * or higher. We pass the lock level down
4555 : * so that we can apply it recursively to inherited tables. Note that the
4556 : * lock level we want as we recurse might well be higher than required for
4557 : * that specific subcommand. So we pass down the overall lock requirement,
4558 : * rather than reassess it at lower levels.
4559 : *
4560 : * The caller also provides a "context" which is to be passed back to
4561 : * utility.c when we need to execute a subcommand such as CREATE INDEX.
4562 : * Some of the fields therein, such as the relid, are used here as well.
4563 : */
4564 : void
4565 20477 : AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
4566 : AlterTableUtilityContext *context)
4567 : {
4568 : Relation rel;
4569 :
4570 : /* Caller is required to provide an adequate lock. */
4571 20477 : rel = relation_open(context->relid, NoLock);
4572 :
4573 20477 : CheckAlterTableIsSafe(rel);
4574 :
4575 20465 : ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
4576 17618 : }
4577 :
4578 : /*
4579 : * AlterTableInternal
4580 : *
4581 : * ALTER TABLE with target specified by OID
4582 : *
4583 : * We do not reject if the relation is already open, because it's quite
4584 : * likely that one or more layers of caller have it open. That means it
4585 : * is unsafe to use this entry point for alterations that could break
4586 : * existing query plans. On the assumption it's not used for such, we
4587 : * don't have to reject pending AFTER triggers, either.
4588 : *
4589 : * Also, since we don't have an AlterTableUtilityContext, this cannot be
4590 : * used for any subcommand types that require parse transformation or
4591 : * could generate subcommands that have to be passed to ProcessUtility.
4592 : */
4593 : void
4594 194 : AlterTableInternal(Oid relid, List *cmds, bool recurse)
4595 : {
4596 : Relation rel;
4597 194 : LOCKMODE lockmode = AlterTableGetLockLevel(cmds);
4598 :
4599 194 : rel = relation_open(relid, lockmode);
4600 :
4601 194 : EventTriggerAlterTableRelid(relid);
4602 :
4603 194 : ATController(NULL, rel, cmds, recurse, lockmode, NULL);
4604 194 : }
4605 :
4606 : /*
4607 : * AlterTableGetLockLevel
4608 : *
4609 : * Sets the overall lock level required for the supplied list of subcommands.
4610 : * Policy for doing this set according to needs of AlterTable(), see
4611 : * comments there for overall explanation.
4612 : *
4613 : * Function is called before and after parsing, so it must give same
4614 : * answer each time it is called. Some subcommands are transformed
4615 : * into other subcommand types, so the transform must never be made to a
4616 : * lower lock level than previously assigned. All transforms are noted below.
4617 : *
4618 : * Since this is called before we lock the table we cannot use table metadata
4619 : * to influence the type of lock we acquire.
4620 : *
4621 : * There should be no lockmodes hardcoded into the subcommand functions. All
4622 : * lockmode decisions for ALTER TABLE are made here only. The one exception is
4623 : * ALTER TABLE RENAME which is treated as a different statement type T_RenameStmt
4624 : * and does not travel through this section of code and cannot be combined with
4625 : * any of the subcommands given here.
4626 : *
4627 : * Note that Hot Standby only knows about AccessExclusiveLocks on the primary
4628 : * so any changes that might affect SELECTs running on standbys need to use
4629 : * AccessExclusiveLocks even if you think a lesser lock would do, unless you
4630 : * have a solution for that also.
4631 : *
4632 : * Also note that pg_dump uses only an AccessShareLock, meaning that anything
4633 : * that takes a lock less than AccessExclusiveLock can change object definitions
4634 : * while pg_dump is running. Be careful to check that the appropriate data is
4635 : * derived by pg_dump using an MVCC snapshot, rather than syscache lookups,
4636 : * otherwise we might end up with an inconsistent dump that can't restore.
4637 : */
4638 : LOCKMODE
4639 20844 : AlterTableGetLockLevel(List *cmds)
4640 : {
4641 : /*
4642 : * This only works if we read catalog tables using MVCC snapshots.
4643 : */
4644 : ListCell *lcmd;
4645 20844 : LOCKMODE lockmode = ShareUpdateExclusiveLock;
4646 :
4647 42516 : foreach(lcmd, cmds)
4648 : {
4649 21672 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4650 21672 : LOCKMODE cmd_lockmode = AccessExclusiveLock; /* default for compiler */
4651 :
4652 21672 : switch (cmd->subtype)
4653 : {
4654 : /*
4655 : * These subcommands rewrite the heap, so require full locks.
4656 : */
4657 2586 : case AT_AddColumn: /* may rewrite heap, in some cases and visible
4658 : * to SELECT */
4659 : case AT_SetAccessMethod: /* must rewrite heap */
4660 : case AT_SetTableSpace: /* must rewrite heap */
4661 : case AT_AlterColumnType: /* must rewrite heap */
4662 2586 : cmd_lockmode = AccessExclusiveLock;
4663 2586 : break;
4664 :
4665 : /*
4666 : * These subcommands may require addition of toast tables. If
4667 : * we add a toast table to a table currently being scanned, we
4668 : * might miss data added to the new toast table by concurrent
4669 : * insert transactions.
4670 : */
4671 159 : case AT_SetStorage: /* may add toast tables, see
4672 : * ATRewriteCatalogs() */
4673 159 : cmd_lockmode = AccessExclusiveLock;
4674 159 : break;
4675 :
4676 : /*
4677 : * Removing constraints can affect SELECTs that have been
4678 : * optimized assuming the constraint holds true. See also
4679 : * CloneFkReferenced.
4680 : */
4681 759 : case AT_DropConstraint: /* as DROP INDEX */
4682 : case AT_DropNotNull: /* may change some SQL plans */
4683 759 : cmd_lockmode = AccessExclusiveLock;
4684 759 : break;
4685 :
4686 : /*
4687 : * Subcommands that may be visible to concurrent SELECTs
4688 : */
4689 1191 : case AT_DropColumn: /* change visible to SELECT */
4690 : case AT_AddColumnToView: /* CREATE VIEW */
4691 : case AT_DropOids: /* used to equiv to DropColumn */
4692 : case AT_EnableAlwaysRule: /* may change SELECT rules */
4693 : case AT_EnableReplicaRule: /* may change SELECT rules */
4694 : case AT_EnableRule: /* may change SELECT rules */
4695 : case AT_DisableRule: /* may change SELECT rules */
4696 1191 : cmd_lockmode = AccessExclusiveLock;
4697 1191 : break;
4698 :
4699 : /*
4700 : * Changing owner may remove implicit SELECT privileges
4701 : */
4702 1140 : case AT_ChangeOwner: /* change visible to SELECT */
4703 1140 : cmd_lockmode = AccessExclusiveLock;
4704 1140 : break;
4705 :
4706 : /*
4707 : * Changing foreign table options may affect optimization.
4708 : */
4709 140 : case AT_GenericOptions:
4710 : case AT_AlterColumnGenericOptions:
4711 140 : cmd_lockmode = AccessExclusiveLock;
4712 140 : break;
4713 :
4714 : /*
4715 : * These subcommands affect write operations only.
4716 : */
4717 191 : case AT_EnableTrig:
4718 : case AT_EnableAlwaysTrig:
4719 : case AT_EnableReplicaTrig:
4720 : case AT_EnableTrigAll:
4721 : case AT_EnableTrigUser:
4722 : case AT_DisableTrig:
4723 : case AT_DisableTrigAll:
4724 : case AT_DisableTrigUser:
4725 191 : cmd_lockmode = ShareRowExclusiveLock;
4726 191 : break;
4727 :
4728 : /*
4729 : * These subcommands affect write operations only. XXX
4730 : * Theoretically, these could be ShareRowExclusiveLock.
4731 : */
4732 2026 : case AT_ColumnDefault:
4733 : case AT_CookedColumnDefault:
4734 : case AT_AlterConstraint:
4735 : case AT_AddIndex: /* from ADD CONSTRAINT */
4736 : case AT_AddIndexConstraint:
4737 : case AT_ReplicaIdentity:
4738 : case AT_SetNotNull:
4739 : case AT_EnableRowSecurity:
4740 : case AT_DisableRowSecurity:
4741 : case AT_ForceRowSecurity:
4742 : case AT_NoForceRowSecurity:
4743 : case AT_AddIdentity:
4744 : case AT_DropIdentity:
4745 : case AT_SetIdentity:
4746 : case AT_SetExpression:
4747 : case AT_DropExpression:
4748 : case AT_SetCompression:
4749 2026 : cmd_lockmode = AccessExclusiveLock;
4750 2026 : break;
4751 :
4752 9232 : case AT_AddConstraint:
4753 : case AT_ReAddConstraint: /* becomes AT_AddConstraint */
4754 : case AT_ReAddDomainConstraint: /* becomes AT_AddConstraint */
4755 9232 : if (IsA(cmd->def, Constraint))
4756 : {
4757 9232 : Constraint *con = (Constraint *) cmd->def;
4758 :
4759 9232 : switch (con->contype)
4760 : {
4761 6742 : case CONSTR_EXCLUSION:
4762 : case CONSTR_PRIMARY:
4763 : case CONSTR_UNIQUE:
4764 :
4765 : /*
4766 : * Cases essentially the same as CREATE INDEX. We
4767 : * could reduce the lock strength to ShareLock if
4768 : * we can work out how to allow concurrent catalog
4769 : * updates. XXX Might be set down to
4770 : * ShareRowExclusiveLock but requires further
4771 : * analysis.
4772 : */
4773 6742 : cmd_lockmode = AccessExclusiveLock;
4774 6742 : break;
4775 1687 : case CONSTR_FOREIGN:
4776 :
4777 : /*
4778 : * We add triggers to both tables when we add a
4779 : * Foreign Key, so the lock level must be at least
4780 : * as strong as CREATE TRIGGER.
4781 : */
4782 1687 : cmd_lockmode = ShareRowExclusiveLock;
4783 1687 : break;
4784 :
4785 803 : default:
4786 803 : cmd_lockmode = AccessExclusiveLock;
4787 : }
4788 : }
4789 9232 : break;
4790 :
4791 : /*
4792 : * These subcommands affect inheritance behaviour. Queries
4793 : * started before us will continue to see the old inheritance
4794 : * behaviour, while queries started after we commit will see
4795 : * new behaviour. No need to prevent reads or writes to the
4796 : * subtable while we hook it up though. Changing the TupDesc
4797 : * may be a problem, so keep highest lock.
4798 : */
4799 386 : case AT_AddInherit:
4800 : case AT_DropInherit:
4801 386 : cmd_lockmode = AccessExclusiveLock;
4802 386 : break;
4803 :
4804 : /*
4805 : * These subcommands affect implicit row type conversion. They
4806 : * have affects similar to CREATE/DROP CAST on queries. don't
4807 : * provide for invalidating parse trees as a result of such
4808 : * changes, so we keep these at AccessExclusiveLock.
4809 : */
4810 46 : case AT_AddOf:
4811 : case AT_DropOf:
4812 46 : cmd_lockmode = AccessExclusiveLock;
4813 46 : break;
4814 :
4815 : /*
4816 : * Only used by CREATE OR REPLACE VIEW which must conflict
4817 : * with an SELECTs currently using the view.
4818 : */
4819 133 : case AT_ReplaceRelOptions:
4820 133 : cmd_lockmode = AccessExclusiveLock;
4821 133 : break;
4822 :
4823 : /*
4824 : * These subcommands affect general strategies for performance
4825 : * and maintenance, though don't change the semantic results
4826 : * from normal data reads and writes. Delaying an ALTER TABLE
4827 : * behind currently active writes only delays the point where
4828 : * the new strategy begins to take effect, so there is no
4829 : * benefit in waiting. In this case the minimum restriction
4830 : * applies: we don't currently allow concurrent catalog
4831 : * updates.
4832 : */
4833 154 : case AT_SetStatistics: /* Uses MVCC in getTableAttrs() */
4834 : case AT_ClusterOn: /* Uses MVCC in getIndexes() */
4835 : case AT_DropCluster: /* Uses MVCC in getIndexes() */
4836 : case AT_SetOptions: /* Uses MVCC in getTableAttrs() */
4837 : case AT_ResetOptions: /* Uses MVCC in getTableAttrs() */
4838 154 : cmd_lockmode = ShareUpdateExclusiveLock;
4839 154 : break;
4840 :
4841 74 : case AT_SetLogged:
4842 : case AT_SetUnLogged:
4843 74 : cmd_lockmode = AccessExclusiveLock;
4844 74 : break;
4845 :
4846 275 : case AT_ValidateConstraint: /* Uses MVCC in getConstraints() */
4847 275 : cmd_lockmode = ShareUpdateExclusiveLock;
4848 275 : break;
4849 :
4850 : /*
4851 : * Rel options are more complex than first appears. Options
4852 : * are set here for tables, views and indexes; for historical
4853 : * reasons these can all be used with ALTER TABLE, so we can't
4854 : * decide between them using the basic grammar.
4855 : */
4856 491 : case AT_SetRelOptions: /* Uses MVCC in getIndexes() and
4857 : * getTables() */
4858 : case AT_ResetRelOptions: /* Uses MVCC in getIndexes() and
4859 : * getTables() */
4860 491 : cmd_lockmode = AlterTableGetRelOptionsLockLevel((List *) cmd->def);
4861 491 : break;
4862 :
4863 1869 : case AT_AttachPartition:
4864 1869 : cmd_lockmode = ShareUpdateExclusiveLock;
4865 1869 : break;
4866 :
4867 377 : case AT_DetachPartition:
4868 377 : if (((PartitionCmd *) cmd->def)->concurrent)
4869 87 : cmd_lockmode = ShareUpdateExclusiveLock;
4870 : else
4871 290 : cmd_lockmode = AccessExclusiveLock;
4872 377 : break;
4873 :
4874 11 : case AT_DetachPartitionFinalize:
4875 11 : cmd_lockmode = ShareUpdateExclusiveLock;
4876 11 : break;
4877 :
4878 432 : case AT_MergePartitions:
4879 : case AT_SplitPartition:
4880 432 : cmd_lockmode = AccessExclusiveLock;
4881 432 : break;
4882 :
4883 0 : default: /* oops */
4884 0 : elog(ERROR, "unrecognized alter table type: %d",
4885 : (int) cmd->subtype);
4886 : break;
4887 : }
4888 :
4889 : /*
4890 : * Take the greatest lockmode from any subcommand
4891 : */
4892 21672 : if (cmd_lockmode > lockmode)
4893 18075 : lockmode = cmd_lockmode;
4894 : }
4895 :
4896 20844 : return lockmode;
4897 : }
4898 :
4899 : /*
4900 : * ATController provides top level control over the phases.
4901 : *
4902 : * parsetree is passed in to allow it to be passed to event triggers
4903 : * when requested.
4904 : */
4905 : static void
4906 20659 : ATController(AlterTableStmt *parsetree,
4907 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
4908 : AlterTableUtilityContext *context)
4909 : {
4910 20659 : List *wqueue = NIL;
4911 : ListCell *lcmd;
4912 :
4913 : /* Phase 1: preliminary examination of commands, create work queue */
4914 41845 : foreach(lcmd, cmds)
4915 : {
4916 21483 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4917 :
4918 21483 : ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode, context);
4919 : }
4920 :
4921 : /* Close the relation, but keep lock until commit */
4922 20362 : relation_close(rel, NoLock);
4923 :
4924 : /* Phase 2: update system catalogs */
4925 20362 : ATRewriteCatalogs(&wqueue, lockmode, context);
4926 :
4927 : /* Phase 3: scan/rewrite tables as needed, and run afterStmts */
4928 18193 : ATRewriteTables(parsetree, &wqueue, lockmode, context);
4929 17812 : }
4930 :
4931 : /*
4932 : * ATPrepCmd
4933 : *
4934 : * Traffic cop for ALTER TABLE Phase 1 operations, including simple
4935 : * recursion and permission checks.
4936 : *
4937 : * Caller must have acquired appropriate lock type on relation already.
4938 : * This lock should be held until commit.
4939 : */
4940 : static void
4941 22094 : ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
4942 : bool recurse, bool recursing, LOCKMODE lockmode,
4943 : AlterTableUtilityContext *context)
4944 : {
4945 : AlteredTableInfo *tab;
4946 22094 : AlterTablePass pass = AT_PASS_UNSET;
4947 :
4948 : /* Find or create work queue entry for this table */
4949 22094 : tab = ATGetQueueEntry(wqueue, rel);
4950 :
4951 : /*
4952 : * Disallow any ALTER TABLE other than ALTER TABLE DETACH FINALIZE on
4953 : * partitions that are pending detach.
4954 : */
4955 22094 : if (rel->rd_rel->relispartition &&
4956 1794 : cmd->subtype != AT_DetachPartitionFinalize &&
4957 897 : PartitionHasPendingDetach(RelationGetRelid(rel)))
4958 1 : ereport(ERROR,
4959 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
4960 : errmsg("cannot alter partition \"%s\" with an incomplete detach",
4961 : RelationGetRelationName(rel)),
4962 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
4963 :
4964 : /*
4965 : * Copy the original subcommand for each table, so we can scribble on it.
4966 : * This avoids conflicts when different child tables need to make
4967 : * different parse transformations (for example, the same column may have
4968 : * different column numbers in different children).
4969 : */
4970 22093 : cmd = copyObject(cmd);
4971 :
4972 : /*
4973 : * Do permissions and relkind checking, recursion to child tables if
4974 : * needed, and any additional phase-1 processing needed. (But beware of
4975 : * adding any processing that looks at table details that another
4976 : * subcommand could change. In some cases we reject multiple subcommands
4977 : * that could try to change the same state in contrary ways.)
4978 : */
4979 22093 : switch (cmd->subtype)
4980 : {
4981 1560 : case AT_AddColumn: /* ADD COLUMN */
4982 1560 : ATSimplePermissions(cmd->subtype, rel,
4983 : ATT_TABLE | ATT_PARTITIONED_TABLE |
4984 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
4985 1560 : ATPrepAddColumn(wqueue, rel, recurse, recursing, false, cmd,
4986 : lockmode, context);
4987 : /* Recursion occurs during execution phase */
4988 1552 : pass = AT_PASS_ADD_COL;
4989 1552 : break;
4990 21 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
4991 21 : ATSimplePermissions(cmd->subtype, rel, ATT_VIEW);
4992 21 : ATPrepAddColumn(wqueue, rel, recurse, recursing, true, cmd,
4993 : lockmode, context);
4994 : /* Recursion occurs during execution phase */
4995 21 : pass = AT_PASS_ADD_COL;
4996 21 : break;
4997 407 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
4998 :
4999 : /*
5000 : * We allow defaults on views so that INSERT into a view can have
5001 : * default-ish behavior. This works because the rewriter
5002 : * substitutes default values into INSERTs before it expands
5003 : * rules.
5004 : */
5005 407 : ATSimplePermissions(cmd->subtype, rel,
5006 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5007 : ATT_FOREIGN_TABLE);
5008 407 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5009 : /* No command-specific prep needed */
5010 407 : pass = cmd->def ? AT_PASS_ADD_OTHERCONSTR : AT_PASS_DROP;
5011 407 : break;
5012 53 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5013 : /* This is currently used only in CREATE TABLE */
5014 : /* (so the permission check really isn't necessary) */
5015 53 : ATSimplePermissions(cmd->subtype, rel,
5016 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5017 : /* This command never recurses */
5018 53 : pass = AT_PASS_ADD_OTHERCONSTR;
5019 53 : break;
5020 107 : case AT_AddIdentity:
5021 107 : ATSimplePermissions(cmd->subtype, rel,
5022 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5023 : ATT_FOREIGN_TABLE);
5024 : /* Set up recursion for phase 2; no other prep needed */
5025 107 : if (recurse)
5026 103 : cmd->recurse = true;
5027 107 : pass = AT_PASS_ADD_OTHERCONSTR;
5028 107 : break;
5029 41 : case AT_SetIdentity:
5030 41 : ATSimplePermissions(cmd->subtype, rel,
5031 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5032 : ATT_FOREIGN_TABLE);
5033 : /* Set up recursion for phase 2; no other prep needed */
5034 41 : if (recurse)
5035 37 : cmd->recurse = true;
5036 : /* This should run after AddIdentity, so do it in MISC pass */
5037 41 : pass = AT_PASS_MISC;
5038 41 : break;
5039 37 : case AT_DropIdentity:
5040 37 : ATSimplePermissions(cmd->subtype, rel,
5041 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5042 : ATT_FOREIGN_TABLE);
5043 : /* Set up recursion for phase 2; no other prep needed */
5044 37 : if (recurse)
5045 33 : cmd->recurse = true;
5046 37 : pass = AT_PASS_DROP;
5047 37 : break;
5048 181 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5049 181 : ATSimplePermissions(cmd->subtype, rel,
5050 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5051 : /* Set up recursion for phase 2; no other prep needed */
5052 177 : if (recurse)
5053 165 : cmd->recurse = true;
5054 177 : pass = AT_PASS_DROP;
5055 177 : break;
5056 276 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5057 276 : ATSimplePermissions(cmd->subtype, rel,
5058 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5059 : /* Set up recursion for phase 2; no other prep needed */
5060 272 : if (recurse)
5061 252 : cmd->recurse = true;
5062 272 : pass = AT_PASS_COL_ATTRS;
5063 272 : break;
5064 153 : case AT_SetExpression: /* ALTER COLUMN SET EXPRESSION */
5065 153 : ATSimplePermissions(cmd->subtype, rel,
5066 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5067 153 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5068 153 : pass = AT_PASS_SET_EXPRESSION;
5069 153 : break;
5070 57 : case AT_DropExpression: /* ALTER COLUMN DROP EXPRESSION */
5071 57 : ATSimplePermissions(cmd->subtype, rel,
5072 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5073 57 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5074 57 : ATPrepDropExpression(rel, cmd, recurse, recursing, lockmode);
5075 41 : pass = AT_PASS_DROP;
5076 41 : break;
5077 107 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5078 107 : ATSimplePermissions(cmd->subtype, rel,
5079 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW |
5080 : ATT_INDEX | ATT_PARTITIONED_INDEX | ATT_FOREIGN_TABLE);
5081 107 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5082 : /* No command-specific prep needed */
5083 107 : pass = AT_PASS_MISC;
5084 107 : break;
5085 29 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5086 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5087 29 : ATSimplePermissions(cmd->subtype, rel,
5088 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5089 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5090 : /* This command never recurses */
5091 21 : pass = AT_PASS_MISC;
5092 21 : break;
5093 173 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5094 173 : ATSimplePermissions(cmd->subtype, rel,
5095 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5096 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5097 173 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5098 : /* No command-specific prep needed */
5099 173 : pass = AT_PASS_MISC;
5100 173 : break;
5101 47 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5102 47 : ATSimplePermissions(cmd->subtype, rel,
5103 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5104 : /* This command never recurses */
5105 : /* No command-specific prep needed */
5106 47 : pass = AT_PASS_MISC;
5107 47 : break;
5108 1117 : case AT_DropColumn: /* DROP COLUMN */
5109 1117 : ATSimplePermissions(cmd->subtype, rel,
5110 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5111 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5112 1113 : ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd,
5113 : lockmode, context);
5114 : /* Recursion occurs during execution phase */
5115 1105 : pass = AT_PASS_DROP;
5116 1105 : break;
5117 0 : case AT_AddIndex: /* ADD INDEX */
5118 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5119 : /* This command never recurses */
5120 : /* No command-specific prep needed */
5121 0 : pass = AT_PASS_ADD_INDEX;
5122 0 : break;
5123 9529 : case AT_AddConstraint: /* ADD CONSTRAINT */
5124 9529 : ATSimplePermissions(cmd->subtype, rel,
5125 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5126 9529 : ATPrepAddPrimaryKey(wqueue, rel, cmd, recurse, lockmode, context);
5127 9509 : if (recurse)
5128 : {
5129 : /* recurses at exec time; lock descendants and set flag */
5130 9268 : (void) find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
5131 9268 : cmd->recurse = true;
5132 : }
5133 9509 : pass = AT_PASS_ADD_CONSTR;
5134 9509 : break;
5135 0 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5136 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5137 : /* This command never recurses */
5138 : /* No command-specific prep needed */
5139 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5140 0 : break;
5141 553 : case AT_DropConstraint: /* DROP CONSTRAINT */
5142 553 : ATSimplePermissions(cmd->subtype, rel,
5143 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5144 553 : ATCheckPartitionsNotInUse(rel, lockmode);
5145 : /* Other recursion occurs during execution phase */
5146 : /* No command-specific prep needed except saving recurse flag */
5147 549 : if (recurse)
5148 525 : cmd->recurse = true;
5149 549 : pass = AT_PASS_DROP;
5150 549 : break;
5151 940 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5152 940 : ATSimplePermissions(cmd->subtype, rel,
5153 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5154 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5155 : /* See comments for ATPrepAlterColumnType */
5156 940 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, recurse, lockmode,
5157 : AT_PASS_UNSET, context);
5158 : Assert(cmd != NULL);
5159 : /* Performs own recursion */
5160 936 : ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd,
5161 : lockmode, context);
5162 805 : pass = AT_PASS_ALTER_TYPE;
5163 805 : break;
5164 93 : case AT_AlterColumnGenericOptions:
5165 93 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5166 : /* This command never recurses */
5167 : /* No command-specific prep needed */
5168 93 : pass = AT_PASS_MISC;
5169 93 : break;
5170 1124 : case AT_ChangeOwner: /* ALTER OWNER */
5171 : /* This command never recurses */
5172 : /* No command-specific prep needed */
5173 1124 : pass = AT_PASS_MISC;
5174 1124 : break;
5175 43 : case AT_ClusterOn: /* CLUSTER ON */
5176 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5177 43 : ATSimplePermissions(cmd->subtype, rel,
5178 : ATT_TABLE | ATT_MATVIEW);
5179 : /* These commands never recurse */
5180 : /* No command-specific prep needed */
5181 35 : pass = AT_PASS_MISC;
5182 35 : break;
5183 74 : case AT_SetLogged: /* SET LOGGED */
5184 : case AT_SetUnLogged: /* SET UNLOGGED */
5185 74 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
5186 66 : if (tab->chgPersistence)
5187 0 : ereport(ERROR,
5188 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5189 : errmsg("cannot change persistence setting twice")));
5190 66 : ATPrepChangePersistence(tab, rel, cmd->subtype == AT_SetLogged);
5191 58 : pass = AT_PASS_MISC;
5192 58 : break;
5193 4 : case AT_DropOids: /* SET WITHOUT OIDS */
5194 4 : ATSimplePermissions(cmd->subtype, rel,
5195 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5196 4 : pass = AT_PASS_DROP;
5197 4 : break;
5198 85 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5199 85 : ATSimplePermissions(cmd->subtype, rel,
5200 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5201 :
5202 : /* check if another access method change was already requested */
5203 85 : if (tab->chgAccessMethod)
5204 12 : ereport(ERROR,
5205 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5206 : errmsg("cannot have multiple SET ACCESS METHOD subcommands")));
5207 :
5208 73 : ATPrepSetAccessMethod(tab, rel, cmd->name);
5209 73 : pass = AT_PASS_MISC; /* does not matter; no work in Phase 2 */
5210 73 : break;
5211 107 : case AT_SetTableSpace: /* SET TABLESPACE */
5212 107 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE |
5213 : ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX);
5214 : /* This command never recurses */
5215 107 : ATPrepSetTableSpace(tab, rel, cmd->name, lockmode);
5216 107 : pass = AT_PASS_MISC; /* doesn't actually matter */
5217 107 : break;
5218 623 : case AT_SetRelOptions: /* SET (...) */
5219 : case AT_ResetRelOptions: /* RESET (...) */
5220 : case AT_ReplaceRelOptions: /* reset them all, then set just these */
5221 623 : ATSimplePermissions(cmd->subtype, rel,
5222 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5223 : ATT_MATVIEW | ATT_INDEX);
5224 : /* This command never recurses */
5225 : /* No command-specific prep needed */
5226 622 : pass = AT_PASS_MISC;
5227 622 : break;
5228 305 : case AT_AddInherit: /* INHERIT */
5229 305 : ATSimplePermissions(cmd->subtype, rel,
5230 : ATT_TABLE | ATT_FOREIGN_TABLE);
5231 : /* This command never recurses */
5232 301 : ATPrepChangeInherit(rel);
5233 289 : pass = AT_PASS_MISC;
5234 289 : break;
5235 81 : case AT_DropInherit: /* NO INHERIT */
5236 81 : ATSimplePermissions(cmd->subtype, rel,
5237 : ATT_TABLE | ATT_FOREIGN_TABLE);
5238 : /* This command never recurses */
5239 77 : ATPrepChangeInherit(rel);
5240 69 : pass = AT_PASS_MISC;
5241 69 : break;
5242 288 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5243 288 : ATSimplePermissions(cmd->subtype, rel,
5244 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5245 : /* Recursion occurs during execution phase */
5246 284 : if (recurse)
5247 276 : cmd->recurse = true;
5248 284 : pass = AT_PASS_MISC;
5249 284 : break;
5250 275 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5251 275 : ATSimplePermissions(cmd->subtype, rel,
5252 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5253 : /* Recursion occurs during execution phase */
5254 : /* No command-specific prep needed except saving recurse flag */
5255 275 : if (recurse)
5256 275 : cmd->recurse = true;
5257 275 : pass = AT_PASS_MISC;
5258 275 : break;
5259 301 : case AT_ReplicaIdentity: /* REPLICA IDENTITY ... */
5260 301 : ATSimplePermissions(cmd->subtype, rel,
5261 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5262 301 : pass = AT_PASS_MISC;
5263 : /* This command never recurses */
5264 : /* No command-specific prep needed */
5265 301 : break;
5266 191 : case AT_EnableTrig: /* ENABLE TRIGGER variants */
5267 : case AT_EnableAlwaysTrig:
5268 : case AT_EnableReplicaTrig:
5269 : case AT_EnableTrigAll:
5270 : case AT_EnableTrigUser:
5271 : case AT_DisableTrig: /* DISABLE TRIGGER variants */
5272 : case AT_DisableTrigAll:
5273 : case AT_DisableTrigUser:
5274 191 : ATSimplePermissions(cmd->subtype, rel,
5275 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5276 : /* Set up recursion for phase 2; no other prep needed */
5277 191 : if (recurse)
5278 174 : cmd->recurse = true;
5279 191 : pass = AT_PASS_MISC;
5280 191 : break;
5281 407 : case AT_EnableRule: /* ENABLE/DISABLE RULE variants */
5282 : case AT_EnableAlwaysRule:
5283 : case AT_EnableReplicaRule:
5284 : case AT_DisableRule:
5285 : case AT_AddOf: /* OF */
5286 : case AT_DropOf: /* NOT OF */
5287 : case AT_EnableRowSecurity:
5288 : case AT_DisableRowSecurity:
5289 : case AT_ForceRowSecurity:
5290 : case AT_NoForceRowSecurity:
5291 407 : ATSimplePermissions(cmd->subtype, rel,
5292 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5293 : /* These commands never recurse */
5294 : /* No command-specific prep needed */
5295 407 : pass = AT_PASS_MISC;
5296 407 : break;
5297 31 : case AT_GenericOptions:
5298 31 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5299 : /* No command-specific prep needed */
5300 31 : pass = AT_PASS_MISC;
5301 31 : break;
5302 1861 : case AT_AttachPartition:
5303 1861 : ATSimplePermissions(cmd->subtype, rel,
5304 : ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
5305 : /* No command-specific prep needed */
5306 1857 : pass = AT_PASS_MISC;
5307 1857 : break;
5308 377 : case AT_DetachPartition:
5309 377 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5310 : /* No command-specific prep needed */
5311 365 : pass = AT_PASS_MISC;
5312 365 : break;
5313 11 : case AT_DetachPartitionFinalize:
5314 11 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5315 : /* No command-specific prep needed */
5316 7 : pass = AT_PASS_MISC;
5317 7 : break;
5318 424 : case AT_MergePartitions:
5319 : case AT_SplitPartition:
5320 424 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5321 : /* No command-specific prep needed */
5322 420 : pass = AT_PASS_MISC;
5323 420 : break;
5324 0 : default: /* oops */
5325 0 : elog(ERROR, "unrecognized alter table type: %d",
5326 : (int) cmd->subtype);
5327 : pass = AT_PASS_UNSET; /* keep compiler quiet */
5328 : break;
5329 : }
5330 : Assert(pass > AT_PASS_UNSET);
5331 :
5332 : /* Add the subcommand to the appropriate list for phase 2 */
5333 21789 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd);
5334 21789 : }
5335 :
5336 : /*
5337 : * ATRewriteCatalogs
5338 : *
5339 : * Traffic cop for ALTER TABLE Phase 2 operations. Subcommands are
5340 : * dispatched in a "safe" execution order (designed to avoid unnecessary
5341 : * conflicts).
5342 : */
5343 : static void
5344 20362 : ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
5345 : AlterTableUtilityContext *context)
5346 : {
5347 : ListCell *ltab;
5348 :
5349 : /*
5350 : * We process all the tables "in parallel", one pass at a time. This is
5351 : * needed because we may have to propagate work from one table to another
5352 : * (specifically, ALTER TYPE on a foreign key's PK has to dispatch the
5353 : * re-adding of the foreign key constraint to the other table). Work can
5354 : * only be propagated into later passes, however.
5355 : */
5356 255294 : for (AlterTablePass pass = 0; pass < AT_NUM_PASSES; pass++)
5357 : {
5358 : /* Go through each table that needs to be processed */
5359 483090 : foreach(ltab, *wqueue)
5360 : {
5361 248158 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5362 248158 : List *subcmds = tab->subcmds[pass];
5363 : ListCell *lcmd;
5364 :
5365 248158 : if (subcmds == NIL)
5366 213926 : continue;
5367 :
5368 : /*
5369 : * Open the relation and store it in tab. This allows subroutines
5370 : * close and reopen, if necessary. Appropriate lock was obtained
5371 : * by phase 1, needn't get it again.
5372 : */
5373 34232 : tab->rel = relation_open(tab->relid, NoLock);
5374 :
5375 68526 : foreach(lcmd, subcmds)
5376 36463 : ATExecCmd(wqueue, tab,
5377 36463 : lfirst_node(AlterTableCmd, lcmd),
5378 : lockmode, pass, context);
5379 :
5380 : /*
5381 : * After the ALTER TYPE or SET EXPRESSION pass, do cleanup work
5382 : * (this is not done in ATExecAlterColumnType since it should be
5383 : * done only once if multiple columns of a table are altered).
5384 : */
5385 32063 : if (pass == AT_PASS_ALTER_TYPE || pass == AT_PASS_SET_EXPRESSION)
5386 866 : ATPostAlterTypeCleanup(wqueue, tab, lockmode);
5387 :
5388 32063 : if (tab->rel)
5389 : {
5390 32063 : relation_close(tab->rel, NoLock);
5391 32063 : tab->rel = NULL;
5392 : }
5393 : }
5394 : }
5395 :
5396 : /* Check to see if a toast table must be added. */
5397 39362 : foreach(ltab, *wqueue)
5398 : {
5399 21169 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5400 :
5401 : /*
5402 : * If the table is source table of ATTACH PARTITION command, we did
5403 : * not modify anything about it that will change its toasting
5404 : * requirement, so no need to check.
5405 : */
5406 21169 : if (((tab->relkind == RELKIND_RELATION ||
5407 4267 : tab->relkind == RELKIND_PARTITIONED_TABLE) &&
5408 19965 : tab->partition_constraint == NULL) ||
5409 2597 : tab->relkind == RELKIND_MATVIEW)
5410 18602 : AlterTableCreateToastTable(tab->relid, (Datum) 0, lockmode);
5411 : }
5412 18193 : }
5413 :
5414 : /*
5415 : * ATExecCmd: dispatch a subcommand to appropriate execution routine
5416 : */
5417 : static void
5418 36463 : ATExecCmd(List **wqueue, AlteredTableInfo *tab,
5419 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
5420 : AlterTableUtilityContext *context)
5421 : {
5422 36463 : ObjectAddress address = InvalidObjectAddress;
5423 36463 : Relation rel = tab->rel;
5424 :
5425 36463 : switch (cmd->subtype)
5426 : {
5427 1569 : case AT_AddColumn: /* ADD COLUMN */
5428 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
5429 1569 : address = ATExecAddColumn(wqueue, tab, rel, &cmd,
5430 1569 : cmd->recurse, false,
5431 : lockmode, cur_pass, context);
5432 1401 : break;
5433 383 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
5434 383 : address = ATExecColumnDefault(rel, cmd->name, cmd->def, lockmode);
5435 339 : break;
5436 53 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5437 53 : address = ATExecCookedColumnDefault(rel, cmd->num, cmd->def);
5438 53 : break;
5439 107 : case AT_AddIdentity:
5440 107 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5441 : cur_pass, context);
5442 : Assert(cmd != NULL);
5443 99 : address = ATExecAddIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5444 63 : break;
5445 41 : case AT_SetIdentity:
5446 41 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5447 : cur_pass, context);
5448 : Assert(cmd != NULL);
5449 41 : address = ATExecSetIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5450 25 : break;
5451 37 : case AT_DropIdentity:
5452 37 : address = ATExecDropIdentity(rel, cmd->name, cmd->missing_ok, lockmode, cmd->recurse, false);
5453 25 : break;
5454 177 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5455 177 : address = ATExecDropNotNull(rel, cmd->name, cmd->recurse, lockmode);
5456 109 : break;
5457 272 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5458 272 : address = ATExecSetNotNull(wqueue, rel, NULL, cmd->name,
5459 272 : cmd->recurse, false, lockmode);
5460 252 : break;
5461 153 : case AT_SetExpression:
5462 153 : address = ATExecSetExpression(tab, rel, cmd->name, cmd->def, lockmode);
5463 141 : break;
5464 37 : case AT_DropExpression:
5465 37 : address = ATExecDropExpression(rel, cmd->name, cmd->missing_ok, lockmode);
5466 21 : break;
5467 107 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5468 107 : address = ATExecSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
5469 75 : break;
5470 17 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5471 17 : address = ATExecSetOptions(rel, cmd->name, cmd->def, false, lockmode);
5472 17 : break;
5473 4 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5474 4 : address = ATExecSetOptions(rel, cmd->name, cmd->def, true, lockmode);
5475 4 : break;
5476 173 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5477 173 : address = ATExecSetStorage(rel, cmd->name, cmd->def, lockmode);
5478 165 : break;
5479 47 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5480 47 : address = ATExecSetCompression(rel, cmd->name, cmd->def,
5481 : lockmode);
5482 43 : break;
5483 1105 : case AT_DropColumn: /* DROP COLUMN */
5484 1105 : address = ATExecDropColumn(wqueue, rel, cmd->name,
5485 1105 : cmd->behavior, cmd->recurse, false,
5486 1105 : cmd->missing_ok, lockmode,
5487 : NULL);
5488 977 : break;
5489 758 : case AT_AddIndex: /* ADD INDEX */
5490 758 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, false,
5491 : lockmode);
5492 645 : break;
5493 307 : case AT_ReAddIndex: /* ADD INDEX */
5494 307 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, true,
5495 : lockmode);
5496 307 : break;
5497 53 : case AT_ReAddStatistics: /* ADD STATISTICS */
5498 53 : address = ATExecAddStatistics(tab, rel, (CreateStatsStmt *) cmd->def,
5499 : true, lockmode);
5500 53 : break;
5501 16866 : case AT_AddConstraint: /* ADD CONSTRAINT */
5502 : /* Transform the command only during initial examination */
5503 16866 : if (cur_pass == AT_PASS_ADD_CONSTR)
5504 9489 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd,
5505 9509 : cmd->recurse, lockmode,
5506 : cur_pass, context);
5507 : /* Depending on constraint type, might be no more work to do now */
5508 16846 : if (cmd != NULL)
5509 : address =
5510 7357 : ATExecAddConstraint(wqueue, tab, rel,
5511 7357 : (Constraint *) cmd->def,
5512 7357 : cmd->recurse, false, lockmode);
5513 16389 : break;
5514 249 : case AT_ReAddConstraint: /* Re-add pre-existing check constraint */
5515 : address =
5516 249 : ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
5517 : true, true, lockmode);
5518 241 : break;
5519 9 : case AT_ReAddDomainConstraint: /* Re-add pre-existing domain check
5520 : * constraint */
5521 : address =
5522 9 : AlterDomainAddConstraint(((AlterDomainStmt *) cmd->def)->typeName,
5523 9 : ((AlterDomainStmt *) cmd->def)->def,
5524 : NULL);
5525 5 : break;
5526 52 : case AT_ReAddComment: /* Re-add existing comment */
5527 52 : address = CommentObject((CommentStmt *) cmd->def);
5528 52 : break;
5529 5933 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5530 5933 : address = ATExecAddIndexConstraint(tab, rel, (IndexStmt *) cmd->def,
5531 : lockmode);
5532 5925 : break;
5533 284 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5534 284 : address = ATExecAlterConstraint(wqueue, rel,
5535 284 : castNode(ATAlterConstraint, cmd->def),
5536 284 : cmd->recurse, lockmode);
5537 232 : break;
5538 275 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5539 275 : address = ATExecValidateConstraint(wqueue, rel, cmd->name, cmd->recurse,
5540 : false, lockmode);
5541 271 : break;
5542 549 : case AT_DropConstraint: /* DROP CONSTRAINT */
5543 549 : ATExecDropConstraint(rel, cmd->name, cmd->behavior,
5544 549 : cmd->recurse,
5545 549 : cmd->missing_ok, lockmode);
5546 409 : break;
5547 781 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5548 : /* parse transformation was done earlier */
5549 781 : address = ATExecAlterColumnType(tab, rel, cmd, lockmode);
5550 753 : break;
5551 93 : case AT_AlterColumnGenericOptions: /* ALTER COLUMN OPTIONS */
5552 : address =
5553 93 : ATExecAlterColumnGenericOptions(rel, cmd->name,
5554 93 : (List *) cmd->def, lockmode);
5555 89 : break;
5556 1124 : case AT_ChangeOwner: /* ALTER OWNER */
5557 1121 : ATExecChangeOwner(RelationGetRelid(rel),
5558 1124 : get_rolespec_oid(cmd->newowner, false),
5559 : false, lockmode);
5560 1113 : break;
5561 39 : case AT_ClusterOn: /* CLUSTER ON */
5562 39 : address = ATExecClusterOn(rel, cmd->name, lockmode);
5563 39 : break;
5564 8 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5565 8 : ATExecDropCluster(rel, lockmode);
5566 8 : break;
5567 58 : case AT_SetLogged: /* SET LOGGED */
5568 : case AT_SetUnLogged: /* SET UNLOGGED */
5569 58 : break;
5570 4 : case AT_DropOids: /* SET WITHOUT OIDS */
5571 : /* nothing to do here, oid columns don't exist anymore */
5572 4 : break;
5573 61 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5574 :
5575 : /*
5576 : * Only do this for partitioned tables, for which this is just a
5577 : * catalog change. Tables with storage are handled by Phase 3.
5578 : */
5579 61 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
5580 33 : tab->chgAccessMethod)
5581 29 : ATExecSetAccessMethodNoStorage(rel, tab->newAccessMethod);
5582 61 : break;
5583 107 : case AT_SetTableSpace: /* SET TABLESPACE */
5584 :
5585 : /*
5586 : * Only do this for partitioned tables and indexes, for which this
5587 : * is just a catalog change. Other relation types which have
5588 : * storage are handled by Phase 3.
5589 : */
5590 107 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
5591 99 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
5592 24 : ATExecSetTableSpaceNoStorage(rel, tab->newTableSpace);
5593 :
5594 103 : break;
5595 622 : case AT_SetRelOptions: /* SET (...) */
5596 : case AT_ResetRelOptions: /* RESET (...) */
5597 : case AT_ReplaceRelOptions: /* replace entire option list */
5598 622 : ATExecSetRelOptions(rel, (List *) cmd->def, cmd->subtype, lockmode);
5599 588 : break;
5600 65 : case AT_EnableTrig: /* ENABLE TRIGGER name */
5601 65 : ATExecEnableDisableTrigger(rel, cmd->name,
5602 : TRIGGER_FIRES_ON_ORIGIN, false,
5603 65 : cmd->recurse,
5604 : lockmode);
5605 65 : break;
5606 27 : case AT_EnableAlwaysTrig: /* ENABLE ALWAYS TRIGGER name */
5607 27 : ATExecEnableDisableTrigger(rel, cmd->name,
5608 : TRIGGER_FIRES_ALWAYS, false,
5609 27 : cmd->recurse,
5610 : lockmode);
5611 27 : break;
5612 8 : case AT_EnableReplicaTrig: /* ENABLE REPLICA TRIGGER name */
5613 8 : ATExecEnableDisableTrigger(rel, cmd->name,
5614 : TRIGGER_FIRES_ON_REPLICA, false,
5615 8 : cmd->recurse,
5616 : lockmode);
5617 8 : break;
5618 75 : case AT_DisableTrig: /* DISABLE TRIGGER name */
5619 75 : ATExecEnableDisableTrigger(rel, cmd->name,
5620 : TRIGGER_DISABLED, false,
5621 75 : cmd->recurse,
5622 : lockmode);
5623 75 : break;
5624 0 : case AT_EnableTrigAll: /* ENABLE TRIGGER ALL */
5625 0 : ATExecEnableDisableTrigger(rel, NULL,
5626 : TRIGGER_FIRES_ON_ORIGIN, false,
5627 0 : cmd->recurse,
5628 : lockmode);
5629 0 : break;
5630 8 : case AT_DisableTrigAll: /* DISABLE TRIGGER ALL */
5631 8 : ATExecEnableDisableTrigger(rel, NULL,
5632 : TRIGGER_DISABLED, false,
5633 8 : cmd->recurse,
5634 : lockmode);
5635 8 : break;
5636 0 : case AT_EnableTrigUser: /* ENABLE TRIGGER USER */
5637 0 : ATExecEnableDisableTrigger(rel, NULL,
5638 : TRIGGER_FIRES_ON_ORIGIN, true,
5639 0 : cmd->recurse,
5640 : lockmode);
5641 0 : break;
5642 8 : case AT_DisableTrigUser: /* DISABLE TRIGGER USER */
5643 8 : ATExecEnableDisableTrigger(rel, NULL,
5644 : TRIGGER_DISABLED, true,
5645 8 : cmd->recurse,
5646 : lockmode);
5647 8 : break;
5648 :
5649 5 : case AT_EnableRule: /* ENABLE RULE name */
5650 5 : ATExecEnableDisableRule(rel, cmd->name,
5651 : RULE_FIRES_ON_ORIGIN, lockmode);
5652 5 : break;
5653 0 : case AT_EnableAlwaysRule: /* ENABLE ALWAYS RULE name */
5654 0 : ATExecEnableDisableRule(rel, cmd->name,
5655 : RULE_FIRES_ALWAYS, lockmode);
5656 0 : break;
5657 4 : case AT_EnableReplicaRule: /* ENABLE REPLICA RULE name */
5658 4 : ATExecEnableDisableRule(rel, cmd->name,
5659 : RULE_FIRES_ON_REPLICA, lockmode);
5660 4 : break;
5661 20 : case AT_DisableRule: /* DISABLE RULE name */
5662 20 : ATExecEnableDisableRule(rel, cmd->name,
5663 : RULE_DISABLED, lockmode);
5664 20 : break;
5665 :
5666 289 : case AT_AddInherit:
5667 289 : address = ATExecAddInherit(rel, (RangeVar *) cmd->def, lockmode);
5668 209 : break;
5669 69 : case AT_DropInherit:
5670 69 : address = ATExecDropInherit(rel, (RangeVar *) cmd->def, lockmode);
5671 65 : break;
5672 42 : case AT_AddOf:
5673 42 : address = ATExecAddOf(rel, (TypeName *) cmd->def, lockmode);
5674 18 : break;
5675 4 : case AT_DropOf:
5676 4 : ATExecDropOf(rel, lockmode);
5677 4 : break;
5678 313 : case AT_ReplicaIdentity:
5679 313 : ATExecReplicaIdentity(rel, (ReplicaIdentityStmt *) cmd->def, lockmode);
5680 281 : break;
5681 236 : case AT_EnableRowSecurity:
5682 236 : ATExecSetRowSecurity(rel, true);
5683 236 : break;
5684 6 : case AT_DisableRowSecurity:
5685 6 : ATExecSetRowSecurity(rel, false);
5686 6 : break;
5687 70 : case AT_ForceRowSecurity:
5688 70 : ATExecForceNoForceRowSecurity(rel, true);
5689 70 : break;
5690 20 : case AT_NoForceRowSecurity:
5691 20 : ATExecForceNoForceRowSecurity(rel, false);
5692 20 : break;
5693 31 : case AT_GenericOptions:
5694 31 : ATExecGenericOptions(rel, (List *) cmd->def);
5695 30 : break;
5696 1857 : case AT_AttachPartition:
5697 1857 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5698 : cur_pass, context);
5699 : Assert(cmd != NULL);
5700 1841 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
5701 1594 : address = ATExecAttachPartition(wqueue, rel, (PartitionCmd *) cmd->def,
5702 : context);
5703 : else
5704 247 : address = ATExecAttachPartitionIdx(wqueue, rel,
5705 247 : ((PartitionCmd *) cmd->def)->name);
5706 1577 : break;
5707 365 : case AT_DetachPartition:
5708 365 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5709 : cur_pass, context);
5710 : Assert(cmd != NULL);
5711 : /* ATPrepCmd ensures it must be a table */
5712 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5713 365 : address = ATExecDetachPartition(wqueue, tab, rel,
5714 365 : ((PartitionCmd *) cmd->def)->name,
5715 365 : ((PartitionCmd *) cmd->def)->concurrent);
5716 288 : break;
5717 7 : case AT_DetachPartitionFinalize:
5718 7 : address = ATExecDetachPartitionFinalize(rel, ((PartitionCmd *) cmd->def)->name);
5719 7 : break;
5720 172 : case AT_MergePartitions:
5721 172 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5722 : cur_pass, context);
5723 : Assert(cmd != NULL);
5724 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5725 116 : ATExecMergePartitions(wqueue, tab, rel, (PartitionCmd *) cmd->def,
5726 : context);
5727 88 : break;
5728 248 : case AT_SplitPartition:
5729 248 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5730 : cur_pass, context);
5731 : Assert(cmd != NULL);
5732 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5733 128 : ATExecSplitPartition(wqueue, tab, rel, (PartitionCmd *) cmd->def,
5734 : context);
5735 120 : break;
5736 0 : default: /* oops */
5737 0 : elog(ERROR, "unrecognized alter table type: %d",
5738 : (int) cmd->subtype);
5739 : break;
5740 : }
5741 :
5742 : /*
5743 : * Report the subcommand to interested event triggers.
5744 : */
5745 34294 : if (cmd)
5746 24805 : EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
5747 :
5748 : /*
5749 : * Bump the command counter to ensure the next subcommand in the sequence
5750 : * can see the changes so far
5751 : */
5752 34294 : CommandCounterIncrement();
5753 34294 : }
5754 :
5755 : /*
5756 : * ATParseTransformCmd: perform parse transformation for one subcommand
5757 : *
5758 : * Returns the transformed subcommand tree, if there is one, else NULL.
5759 : *
5760 : * The parser may hand back additional AlterTableCmd(s) and/or other
5761 : * utility statements, either before or after the original subcommand.
5762 : * Other AlterTableCmds are scheduled into the appropriate slot of the
5763 : * AlteredTableInfo (they had better be for later passes than the current one).
5764 : * Utility statements that are supposed to happen before the AlterTableCmd
5765 : * are executed immediately. Those that are supposed to happen afterwards
5766 : * are added to the tab->afterStmts list to be done at the very end.
5767 : */
5768 : static AlterTableCmd *
5769 14715 : ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
5770 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
5771 : AlterTablePass cur_pass, AlterTableUtilityContext *context)
5772 : {
5773 14715 : AlterTableCmd *newcmd = NULL;
5774 14715 : AlterTableStmt *atstmt = makeNode(AlterTableStmt);
5775 : List *beforeStmts;
5776 : List *afterStmts;
5777 : ListCell *lc;
5778 :
5779 : /* Gin up an AlterTableStmt with just this subcommand and this table */
5780 14715 : atstmt->relation =
5781 14715 : makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
5782 14715 : pstrdup(RelationGetRelationName(rel)),
5783 : -1);
5784 14715 : atstmt->relation->inh = recurse;
5785 14715 : atstmt->cmds = list_make1(cmd);
5786 14715 : atstmt->objtype = OBJECT_TABLE; /* needn't be picky here */
5787 14715 : atstmt->missing_ok = false;
5788 :
5789 : /* Transform the AlterTableStmt */
5790 14715 : atstmt = transformAlterTableStmt(RelationGetRelid(rel),
5791 : atstmt,
5792 : context->queryString,
5793 : &beforeStmts,
5794 : &afterStmts);
5795 :
5796 : /* Execute any statements that should happen before these subcommand(s) */
5797 14802 : foreach(lc, beforeStmts)
5798 : {
5799 315 : Node *stmt = (Node *) lfirst(lc);
5800 :
5801 315 : ProcessUtilityForAlterTable(stmt, context);
5802 307 : CommandCounterIncrement();
5803 : }
5804 :
5805 : /* Examine the transformed subcommands and schedule them appropriately */
5806 33557 : foreach(lc, atstmt->cmds)
5807 : {
5808 19070 : AlterTableCmd *cmd2 = lfirst_node(AlterTableCmd, lc);
5809 : AlterTablePass pass;
5810 :
5811 : /*
5812 : * This switch need only cover the subcommand types that can be added
5813 : * by parse_utilcmd.c; otherwise, we'll use the default strategy of
5814 : * executing the subcommand immediately, as a substitute for the
5815 : * original subcommand. (Note, however, that this does cause
5816 : * AT_AddConstraint subcommands to be rescheduled into later passes,
5817 : * which is important for index and foreign key constraints.)
5818 : *
5819 : * We assume we needn't do any phase-1 checks for added subcommands.
5820 : */
5821 19070 : switch (cmd2->subtype)
5822 : {
5823 774 : case AT_AddIndex:
5824 774 : pass = AT_PASS_ADD_INDEX;
5825 774 : break;
5826 5933 : case AT_AddIndexConstraint:
5827 5933 : pass = AT_PASS_ADD_INDEXCONSTR;
5828 5933 : break;
5829 7365 : case AT_AddConstraint:
5830 : /* Recursion occurs during execution phase */
5831 7365 : if (recurse)
5832 7328 : cmd2->recurse = true;
5833 7365 : switch (castNode(Constraint, cmd2->def)->contype)
5834 : {
5835 5002 : case CONSTR_NOTNULL:
5836 5002 : pass = AT_PASS_COL_ATTRS;
5837 5002 : break;
5838 0 : case CONSTR_PRIMARY:
5839 : case CONSTR_UNIQUE:
5840 : case CONSTR_EXCLUSION:
5841 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5842 0 : break;
5843 2363 : default:
5844 2363 : pass = AT_PASS_ADD_OTHERCONSTR;
5845 2363 : break;
5846 : }
5847 7365 : break;
5848 0 : case AT_AlterColumnGenericOptions:
5849 : /* This command never recurses */
5850 : /* No command-specific prep needed */
5851 0 : pass = AT_PASS_MISC;
5852 0 : break;
5853 4998 : default:
5854 4998 : pass = cur_pass;
5855 4998 : break;
5856 : }
5857 :
5858 19070 : if (pass < cur_pass)
5859 : {
5860 : /* Cannot schedule into a pass we already finished */
5861 0 : elog(ERROR, "ALTER TABLE scheduling failure: too late for pass %d",
5862 : pass);
5863 : }
5864 19070 : else if (pass > cur_pass)
5865 : {
5866 : /* OK, queue it up for later */
5867 14072 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd2);
5868 : }
5869 : else
5870 : {
5871 : /*
5872 : * We should see at most one subcommand for the current pass,
5873 : * which is the transformed version of the original subcommand.
5874 : */
5875 4998 : if (newcmd == NULL && cmd->subtype == cmd2->subtype)
5876 : {
5877 : /* Found the transformed version of our subcommand */
5878 4998 : newcmd = cmd2;
5879 : }
5880 : else
5881 0 : elog(ERROR, "ALTER TABLE scheduling failure: bogus item for pass %d",
5882 : pass);
5883 : }
5884 : }
5885 :
5886 : /* Queue up any after-statements to happen at the end */
5887 14487 : tab->afterStmts = list_concat(tab->afterStmts, afterStmts);
5888 :
5889 14487 : return newcmd;
5890 : }
5891 :
5892 : /*
5893 : * ATRewriteTables: ALTER TABLE phase 3
5894 : */
5895 : static void
5896 18193 : ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
5897 : AlterTableUtilityContext *context)
5898 : {
5899 : ListCell *ltab;
5900 :
5901 : /* Go through each table that needs to be checked or rewritten */
5902 38972 : foreach(ltab, *wqueue)
5903 : {
5904 21093 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5905 :
5906 : /* Relations without storage may be ignored here */
5907 21093 : if (!RELKIND_HAS_STORAGE(tab->relkind))
5908 4083 : continue;
5909 :
5910 : /*
5911 : * If we change column data types, the operation has to be propagated
5912 : * to tables that use this table's rowtype as a column type.
5913 : * tab->newvals will also be non-NULL in the case where we're adding a
5914 : * column with a default. We choose to forbid that case as well,
5915 : * since composite types might eventually support defaults.
5916 : *
5917 : * (Eventually we'll probably need to check for composite type
5918 : * dependencies even when we're just scanning the table without a
5919 : * rewrite, but at the moment a composite type does not enforce any
5920 : * constraints, so it's not necessary/appropriate to enforce them just
5921 : * during ALTER.)
5922 : */
5923 17010 : if (tab->newvals != NIL || tab->rewrite > 0)
5924 : {
5925 : Relation rel;
5926 :
5927 1272 : rel = table_open(tab->relid, NoLock);
5928 1272 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
5929 1236 : table_close(rel, NoLock);
5930 : }
5931 :
5932 : /*
5933 : * We only need to rewrite the table if at least one column needs to
5934 : * be recomputed, or we are changing its persistence or access method.
5935 : *
5936 : * There are two reasons for requiring a rewrite when changing
5937 : * persistence: on one hand, we need to ensure that the buffers
5938 : * belonging to each of the two relations are marked with or without
5939 : * BM_PERMANENT properly. On the other hand, since rewriting creates
5940 : * and assigns a new relfilenumber, we automatically create or drop an
5941 : * init fork for the relation as appropriate.
5942 : */
5943 16974 : if (tab->rewrite > 0 && tab->relkind != RELKIND_SEQUENCE)
5944 708 : {
5945 : /* Build a temporary relation and copy data */
5946 : Relation OldHeap;
5947 : Oid OIDNewHeap;
5948 : Oid NewAccessMethod;
5949 : Oid NewTableSpace;
5950 : char persistence;
5951 :
5952 757 : OldHeap = table_open(tab->relid, NoLock);
5953 :
5954 : /*
5955 : * We don't support rewriting of system catalogs; there are too
5956 : * many corner cases and too little benefit. In particular this
5957 : * is certainly not going to work for mapped catalogs.
5958 : */
5959 757 : if (IsSystemRelation(OldHeap))
5960 0 : ereport(ERROR,
5961 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5962 : errmsg("cannot rewrite system relation \"%s\"",
5963 : RelationGetRelationName(OldHeap))));
5964 :
5965 757 : if (RelationIsUsedAsCatalogTable(OldHeap))
5966 1 : ereport(ERROR,
5967 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5968 : errmsg("cannot rewrite table \"%s\" used as a catalog table",
5969 : RelationGetRelationName(OldHeap))));
5970 :
5971 : /*
5972 : * Don't allow rewrite on temp tables of other backends ... their
5973 : * local buffer manager is not going to cope. (This is redundant
5974 : * with the check in CheckAlterTableIsSafe, but for safety we'll
5975 : * check here too.)
5976 : */
5977 756 : if (RELATION_IS_OTHER_TEMP(OldHeap))
5978 0 : ereport(ERROR,
5979 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5980 : errmsg("cannot rewrite temporary tables of other sessions")));
5981 :
5982 : /*
5983 : * Select destination tablespace (same as original unless user
5984 : * requested a change)
5985 : */
5986 756 : if (tab->newTableSpace)
5987 0 : NewTableSpace = tab->newTableSpace;
5988 : else
5989 756 : NewTableSpace = OldHeap->rd_rel->reltablespace;
5990 :
5991 : /*
5992 : * Select destination access method (same as original unless user
5993 : * requested a change)
5994 : */
5995 756 : if (tab->chgAccessMethod)
5996 24 : NewAccessMethod = tab->newAccessMethod;
5997 : else
5998 732 : NewAccessMethod = OldHeap->rd_rel->relam;
5999 :
6000 : /*
6001 : * Select persistence of transient table (same as original unless
6002 : * user requested a change)
6003 : */
6004 756 : persistence = tab->chgPersistence ?
6005 722 : tab->newrelpersistence : OldHeap->rd_rel->relpersistence;
6006 :
6007 756 : table_close(OldHeap, NoLock);
6008 :
6009 : /*
6010 : * Fire off an Event Trigger now, before actually rewriting the
6011 : * table.
6012 : *
6013 : * We don't support Event Trigger for nested commands anywhere,
6014 : * here included, and parsetree is given NULL when coming from
6015 : * AlterTableInternal.
6016 : *
6017 : * And fire it only once.
6018 : */
6019 756 : if (parsetree)
6020 756 : EventTriggerTableRewrite((Node *) parsetree,
6021 : tab->relid,
6022 : tab->rewrite);
6023 :
6024 : /*
6025 : * Create transient table that will receive the modified data.
6026 : *
6027 : * Ensure it is marked correctly as logged or unlogged. We have
6028 : * to do this here so that buffers for the new relfilenumber will
6029 : * have the right persistence set, and at the same time ensure
6030 : * that the original filenumbers's buffers will get read in with
6031 : * the correct setting (i.e. the original one). Otherwise a
6032 : * rollback after the rewrite would possibly result with buffers
6033 : * for the original filenumbers having the wrong persistence
6034 : * setting.
6035 : *
6036 : * NB: This relies on swap_relation_files() also swapping the
6037 : * persistence. That wouldn't work for pg_class, but that can't be
6038 : * unlogged anyway.
6039 : */
6040 752 : OIDNewHeap = make_new_heap(tab->relid, NewTableSpace, NewAccessMethod,
6041 : persistence, lockmode);
6042 :
6043 : /*
6044 : * Copy the heap data into the new table with the desired
6045 : * modifications, and test the current data within the table
6046 : * against new constraints generated by ALTER TABLE commands.
6047 : */
6048 752 : ATRewriteTable(tab, OIDNewHeap);
6049 :
6050 : /*
6051 : * Swap the physical files of the old and new heaps, then rebuild
6052 : * indexes and discard the old heap. We can use RecentXmin for
6053 : * the table's new relfrozenxid because we rewrote all the tuples
6054 : * in ATRewriteTable, so no older Xid remains in the table. Also,
6055 : * we never try to swap toast tables by content, since we have no
6056 : * interest in letting this code work on system catalogs.
6057 : */
6058 712 : finish_heap_swap(tab->relid, OIDNewHeap,
6059 : false, false, true,
6060 712 : !OidIsValid(tab->newTableSpace),
6061 : RecentXmin,
6062 : ReadNextMultiXactId(),
6063 : persistence);
6064 :
6065 708 : InvokeObjectPostAlterHook(RelationRelationId, tab->relid, 0);
6066 : }
6067 16217 : else if (tab->rewrite > 0 && tab->relkind == RELKIND_SEQUENCE)
6068 : {
6069 16 : if (tab->chgPersistence)
6070 16 : SequenceChangePersistence(tab->relid, tab->newrelpersistence);
6071 : }
6072 : else
6073 : {
6074 : /*
6075 : * If required, test the current data within the table against new
6076 : * constraints generated by ALTER TABLE commands, but don't
6077 : * rebuild data.
6078 : */
6079 16201 : if (tab->constraints != NIL || tab->verify_new_notnull ||
6080 14149 : tab->partition_constraint != NULL)
6081 3347 : ATRewriteTable(tab, InvalidOid);
6082 :
6083 : /*
6084 : * If we had SET TABLESPACE but no reason to reconstruct tuples,
6085 : * just do a block-by-block copy.
6086 : */
6087 15972 : if (tab->newTableSpace)
6088 83 : ATExecSetTableSpace(tab->relid, tab->newTableSpace, lockmode);
6089 : }
6090 :
6091 : /*
6092 : * Also change persistence of owned sequences, so that it matches the
6093 : * table persistence.
6094 : */
6095 16696 : if (tab->chgPersistence)
6096 : {
6097 50 : List *seqlist = getOwnedSequences(tab->relid);
6098 : ListCell *lc;
6099 :
6100 82 : foreach(lc, seqlist)
6101 : {
6102 32 : Oid seq_relid = lfirst_oid(lc);
6103 :
6104 32 : SequenceChangePersistence(seq_relid, tab->newrelpersistence);
6105 : }
6106 : }
6107 : }
6108 :
6109 : /*
6110 : * Foreign key constraints are checked in a final pass, since (a) it's
6111 : * generally best to examine each one separately, and (b) it's at least
6112 : * theoretically possible that we have changed both relations of the
6113 : * foreign key, and we'd better have finished both rewrites before we try
6114 : * to read the tables.
6115 : */
6116 38429 : foreach(ltab, *wqueue)
6117 : {
6118 20617 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6119 20617 : Relation rel = NULL;
6120 : ListCell *lcon;
6121 :
6122 : /* Relations without storage may be ignored here too */
6123 20617 : if (!RELKIND_HAS_STORAGE(tab->relkind))
6124 3990 : continue;
6125 :
6126 17888 : foreach(lcon, tab->constraints)
6127 : {
6128 1328 : NewConstraint *con = lfirst(lcon);
6129 :
6130 1328 : if (con->contype == CONSTR_FOREIGN)
6131 : {
6132 734 : Constraint *fkconstraint = (Constraint *) con->qual;
6133 : Relation refrel;
6134 :
6135 734 : if (rel == NULL)
6136 : {
6137 : /* Long since locked, no need for another */
6138 726 : rel = table_open(tab->relid, NoLock);
6139 : }
6140 :
6141 734 : refrel = table_open(con->refrelid, RowShareLock);
6142 :
6143 734 : validateForeignKeyConstraint(fkconstraint->conname, rel, refrel,
6144 : con->refindid,
6145 : con->conid,
6146 734 : con->conwithperiod);
6147 :
6148 : /*
6149 : * No need to mark the constraint row as validated, we did
6150 : * that when we inserted the row earlier.
6151 : */
6152 :
6153 667 : table_close(refrel, NoLock);
6154 : }
6155 : }
6156 :
6157 16560 : if (rel)
6158 659 : table_close(rel, NoLock);
6159 : }
6160 :
6161 : /* Finally, run any afterStmts that were queued up */
6162 38335 : foreach(ltab, *wqueue)
6163 : {
6164 20523 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6165 : ListCell *lc;
6166 :
6167 20579 : foreach(lc, tab->afterStmts)
6168 : {
6169 56 : Node *stmt = (Node *) lfirst(lc);
6170 :
6171 56 : ProcessUtilityForAlterTable(stmt, context);
6172 56 : CommandCounterIncrement();
6173 : }
6174 : }
6175 17812 : }
6176 :
6177 : /*
6178 : * ATRewriteTable: scan or rewrite one table
6179 : *
6180 : * A rewrite is requested by passing a valid OIDNewHeap; in that case, caller
6181 : * must already hold AccessExclusiveLock on it.
6182 : */
6183 : static void
6184 4099 : ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
6185 : {
6186 : Relation oldrel;
6187 : Relation newrel;
6188 : TupleDesc oldTupDesc;
6189 : TupleDesc newTupDesc;
6190 4099 : bool needscan = false;
6191 : List *notnull_attrs;
6192 : List *notnull_virtual_attrs;
6193 : int i;
6194 : ListCell *l;
6195 : EState *estate;
6196 : CommandId mycid;
6197 : BulkInsertState bistate;
6198 : int ti_options;
6199 4099 : ExprState *partqualstate = NULL;
6200 :
6201 : /*
6202 : * Open the relation(s). We have surely already locked the existing
6203 : * table.
6204 : */
6205 4099 : oldrel = table_open(tab->relid, NoLock);
6206 4099 : oldTupDesc = tab->oldDesc;
6207 4099 : newTupDesc = RelationGetDescr(oldrel); /* includes all mods */
6208 :
6209 4099 : if (OidIsValid(OIDNewHeap))
6210 : {
6211 : Assert(CheckRelationOidLockedByMe(OIDNewHeap, AccessExclusiveLock,
6212 : false));
6213 752 : newrel = table_open(OIDNewHeap, NoLock);
6214 : }
6215 : else
6216 3347 : newrel = NULL;
6217 :
6218 : /*
6219 : * Prepare a BulkInsertState and options for table_tuple_insert. The FSM
6220 : * is empty, so don't bother using it.
6221 : */
6222 4099 : if (newrel)
6223 : {
6224 752 : mycid = GetCurrentCommandId(true);
6225 752 : bistate = GetBulkInsertState();
6226 752 : ti_options = TABLE_INSERT_SKIP_FSM;
6227 : }
6228 : else
6229 : {
6230 : /* keep compiler quiet about using these uninitialized */
6231 3347 : mycid = 0;
6232 3347 : bistate = NULL;
6233 3347 : ti_options = 0;
6234 : }
6235 :
6236 : /*
6237 : * Generate the constraint and default execution states
6238 : */
6239 :
6240 4099 : estate = CreateExecutorState();
6241 :
6242 : /* Build the needed expression execution states */
6243 5583 : foreach(l, tab->constraints)
6244 : {
6245 1484 : NewConstraint *con = lfirst(l);
6246 :
6247 1484 : switch (con->contype)
6248 : {
6249 746 : case CONSTR_CHECK:
6250 746 : needscan = true;
6251 746 : con->qualstate = ExecPrepareExpr((Expr *) expand_generated_columns_in_expr(con->qual, oldrel, 1), estate);
6252 746 : break;
6253 738 : case CONSTR_FOREIGN:
6254 : /* Nothing to do here */
6255 738 : break;
6256 0 : default:
6257 0 : elog(ERROR, "unrecognized constraint type: %d",
6258 : (int) con->contype);
6259 : }
6260 : }
6261 :
6262 : /* Build expression execution states for partition check quals */
6263 4099 : if (tab->partition_constraint)
6264 : {
6265 1389 : needscan = true;
6266 1389 : partqualstate = ExecPrepareExpr(tab->partition_constraint, estate);
6267 : }
6268 :
6269 4897 : foreach(l, tab->newvals)
6270 : {
6271 798 : NewColumnValue *ex = lfirst(l);
6272 :
6273 : /* expr already planned */
6274 798 : ex->exprstate = ExecInitExpr(ex->expr, NULL);
6275 : }
6276 :
6277 4099 : notnull_attrs = notnull_virtual_attrs = NIL;
6278 4099 : if (newrel || tab->verify_new_notnull)
6279 : {
6280 : /*
6281 : * If we are rebuilding the tuples OR if we added any new but not
6282 : * verified not-null constraints, check all *valid* not-null
6283 : * constraints. This is a bit of overkill but it minimizes risk of
6284 : * bugs.
6285 : *
6286 : * notnull_attrs does *not* collect attribute numbers for valid
6287 : * not-null constraints over virtual generated columns; instead, they
6288 : * are collected in notnull_virtual_attrs for verification elsewhere.
6289 : */
6290 5318 : for (i = 0; i < newTupDesc->natts; i++)
6291 : {
6292 3885 : CompactAttribute *attr = TupleDescCompactAttr(newTupDesc, i);
6293 :
6294 3885 : if (attr->attnullability == ATTNULLABLE_VALID &&
6295 1392 : !attr->attisdropped)
6296 : {
6297 1392 : Form_pg_attribute wholeatt = TupleDescAttr(newTupDesc, i);
6298 :
6299 1392 : if (wholeatt->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
6300 1332 : notnull_attrs = lappend_int(notnull_attrs, wholeatt->attnum);
6301 : else
6302 60 : notnull_virtual_attrs = lappend_int(notnull_virtual_attrs,
6303 60 : wholeatt->attnum);
6304 : }
6305 : }
6306 1433 : if (notnull_attrs || notnull_virtual_attrs)
6307 1023 : needscan = true;
6308 : }
6309 :
6310 4099 : if (newrel || needscan)
6311 : {
6312 : ExprContext *econtext;
6313 : TupleTableSlot *oldslot;
6314 : TupleTableSlot *newslot;
6315 : TableScanDesc scan;
6316 : MemoryContext oldCxt;
6317 3491 : List *dropped_attrs = NIL;
6318 : ListCell *lc;
6319 : Snapshot snapshot;
6320 3491 : ResultRelInfo *rInfo = NULL;
6321 :
6322 : /*
6323 : * When adding or changing a virtual generated column with a not-null
6324 : * constraint, we need to evaluate whether the generation expression
6325 : * is null. For that, we borrow ExecRelGenVirtualNotNull(). Here, we
6326 : * prepare a dummy ResultRelInfo.
6327 : */
6328 3491 : if (notnull_virtual_attrs != NIL)
6329 : {
6330 : MemoryContext oldcontext;
6331 :
6332 : Assert(newTupDesc->constr->has_generated_virtual);
6333 : Assert(newTupDesc->constr->has_not_null);
6334 40 : oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
6335 40 : rInfo = makeNode(ResultRelInfo);
6336 40 : InitResultRelInfo(rInfo,
6337 : oldrel,
6338 : 0, /* dummy rangetable index */
6339 : NULL,
6340 : estate->es_instrument);
6341 40 : MemoryContextSwitchTo(oldcontext);
6342 : }
6343 :
6344 3491 : if (newrel)
6345 752 : ereport(DEBUG1,
6346 : (errmsg_internal("rewriting table \"%s\"",
6347 : RelationGetRelationName(oldrel))));
6348 : else
6349 2739 : ereport(DEBUG1,
6350 : (errmsg_internal("verifying table \"%s\"",
6351 : RelationGetRelationName(oldrel))));
6352 :
6353 3491 : if (newrel)
6354 : {
6355 : /*
6356 : * All predicate locks on the tuples or pages are about to be made
6357 : * invalid, because we move tuples around. Promote them to
6358 : * relation locks.
6359 : */
6360 752 : TransferPredicateLocksToHeapRelation(oldrel);
6361 : }
6362 :
6363 3491 : econtext = GetPerTupleExprContext(estate);
6364 :
6365 : /*
6366 : * Create necessary tuple slots. When rewriting, two slots are needed,
6367 : * otherwise one suffices. In the case where one slot suffices, we
6368 : * need to use the new tuple descriptor, otherwise some constraints
6369 : * can't be evaluated. Note that even when the tuple layout is the
6370 : * same and no rewrite is required, the tupDescs might not be
6371 : * (consider ADD COLUMN without a default).
6372 : */
6373 3491 : if (tab->rewrite)
6374 : {
6375 : Assert(newrel != NULL);
6376 752 : oldslot = MakeSingleTupleTableSlot(oldTupDesc,
6377 : table_slot_callbacks(oldrel));
6378 752 : newslot = MakeSingleTupleTableSlot(newTupDesc,
6379 : table_slot_callbacks(newrel));
6380 :
6381 : /*
6382 : * Set all columns in the new slot to NULL initially, to ensure
6383 : * columns added as part of the rewrite are initialized to NULL.
6384 : * That is necessary as tab->newvals will not contain an
6385 : * expression for columns with a NULL default, e.g. when adding a
6386 : * column without a default together with a column with a default
6387 : * requiring an actual rewrite.
6388 : */
6389 752 : ExecStoreAllNullTuple(newslot);
6390 : }
6391 : else
6392 : {
6393 2739 : oldslot = MakeSingleTupleTableSlot(newTupDesc,
6394 : table_slot_callbacks(oldrel));
6395 2739 : newslot = NULL;
6396 : }
6397 :
6398 : /*
6399 : * Any attributes that are dropped according to the new tuple
6400 : * descriptor can be set to NULL. We precompute the list of dropped
6401 : * attributes to avoid needing to do so in the per-tuple loop.
6402 : */
6403 12316 : for (i = 0; i < newTupDesc->natts; i++)
6404 : {
6405 8825 : if (TupleDescAttr(newTupDesc, i)->attisdropped)
6406 564 : dropped_attrs = lappend_int(dropped_attrs, i);
6407 : }
6408 :
6409 : /*
6410 : * Scan through the rows, generating a new row if needed and then
6411 : * checking all the constraints.
6412 : */
6413 3491 : snapshot = RegisterSnapshot(GetLatestSnapshot());
6414 3491 : scan = table_beginscan(oldrel, snapshot, 0, NULL);
6415 :
6416 : /*
6417 : * Switch to per-tuple memory context and reset it for each tuple
6418 : * produced, so we don't leak memory.
6419 : */
6420 3491 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
6421 :
6422 489917 : while (table_scan_getnextslot(scan, ForwardScanDirection, oldslot))
6423 : {
6424 : TupleTableSlot *insertslot;
6425 :
6426 483204 : if (tab->rewrite > 0)
6427 : {
6428 : /* Extract data from old tuple */
6429 66447 : slot_getallattrs(oldslot);
6430 66447 : ExecClearTuple(newslot);
6431 :
6432 : /* copy attributes */
6433 66447 : memcpy(newslot->tts_values, oldslot->tts_values,
6434 66447 : sizeof(Datum) * oldslot->tts_nvalid);
6435 66447 : memcpy(newslot->tts_isnull, oldslot->tts_isnull,
6436 66447 : sizeof(bool) * oldslot->tts_nvalid);
6437 :
6438 : /* Set dropped attributes to null in new tuple */
6439 66564 : foreach(lc, dropped_attrs)
6440 117 : newslot->tts_isnull[lfirst_int(lc)] = true;
6441 :
6442 : /*
6443 : * Constraints and GENERATED expressions might reference the
6444 : * tableoid column, so fill tts_tableOid with the desired
6445 : * value. (We must do this each time, because it gets
6446 : * overwritten with newrel's OID during storing.)
6447 : */
6448 66447 : newslot->tts_tableOid = RelationGetRelid(oldrel);
6449 :
6450 : /*
6451 : * Process supplied expressions to replace selected columns.
6452 : *
6453 : * First, evaluate expressions whose inputs come from the old
6454 : * tuple.
6455 : */
6456 66447 : econtext->ecxt_scantuple = oldslot;
6457 :
6458 136850 : foreach(l, tab->newvals)
6459 : {
6460 70423 : NewColumnValue *ex = lfirst(l);
6461 :
6462 70423 : if (ex->is_generated)
6463 208 : continue;
6464 :
6465 70215 : newslot->tts_values[ex->attnum - 1]
6466 70195 : = ExecEvalExpr(ex->exprstate,
6467 : econtext,
6468 70215 : &newslot->tts_isnull[ex->attnum - 1]);
6469 : }
6470 :
6471 66427 : ExecStoreVirtualTuple(newslot);
6472 :
6473 : /*
6474 : * Now, evaluate any expressions whose inputs come from the
6475 : * new tuple. We assume these columns won't reference each
6476 : * other, so that there's no ordering dependency.
6477 : */
6478 66427 : econtext->ecxt_scantuple = newslot;
6479 :
6480 136830 : foreach(l, tab->newvals)
6481 : {
6482 70403 : NewColumnValue *ex = lfirst(l);
6483 :
6484 70403 : if (!ex->is_generated)
6485 70195 : continue;
6486 :
6487 208 : newslot->tts_values[ex->attnum - 1]
6488 208 : = ExecEvalExpr(ex->exprstate,
6489 : econtext,
6490 208 : &newslot->tts_isnull[ex->attnum - 1]);
6491 : }
6492 :
6493 66427 : insertslot = newslot;
6494 : }
6495 : else
6496 : {
6497 : /*
6498 : * If there's no rewrite, old and new table are guaranteed to
6499 : * have the same AM, so we can just use the old slot to verify
6500 : * new constraints etc.
6501 : */
6502 416757 : insertslot = oldslot;
6503 : }
6504 :
6505 : /* Now check any constraints on the possibly-changed tuple */
6506 483184 : econtext->ecxt_scantuple = insertslot;
6507 :
6508 2577170 : foreach_int(attn, notnull_attrs)
6509 : {
6510 1610938 : if (slot_attisnull(insertslot, attn))
6511 : {
6512 68 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attn - 1);
6513 :
6514 68 : ereport(ERROR,
6515 : (errcode(ERRCODE_NOT_NULL_VIOLATION),
6516 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6517 : NameStr(attr->attname),
6518 : RelationGetRelationName(oldrel)),
6519 : errtablecol(oldrel, attn)));
6520 : }
6521 : }
6522 :
6523 483116 : if (notnull_virtual_attrs != NIL)
6524 : {
6525 : AttrNumber attnum;
6526 :
6527 56 : attnum = ExecRelGenVirtualNotNull(rInfo, insertslot,
6528 : estate,
6529 : notnull_virtual_attrs);
6530 56 : if (attnum != InvalidAttrNumber)
6531 : {
6532 20 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attnum - 1);
6533 :
6534 20 : ereport(ERROR,
6535 : errcode(ERRCODE_NOT_NULL_VIOLATION),
6536 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6537 : NameStr(attr->attname),
6538 : RelationGetRelationName(oldrel)),
6539 : errtablecol(oldrel, attnum));
6540 : }
6541 : }
6542 :
6543 488309 : foreach(l, tab->constraints)
6544 : {
6545 5325 : NewConstraint *con = lfirst(l);
6546 :
6547 5325 : switch (con->contype)
6548 : {
6549 5259 : case CONSTR_CHECK:
6550 5259 : if (!ExecCheck(con->qualstate, econtext))
6551 112 : ereport(ERROR,
6552 : (errcode(ERRCODE_CHECK_VIOLATION),
6553 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
6554 : con->name,
6555 : RelationGetRelationName(oldrel)),
6556 : errtableconstraint(oldrel, con->name)));
6557 5147 : break;
6558 66 : case CONSTR_NOTNULL:
6559 : case CONSTR_FOREIGN:
6560 : /* Nothing to do here */
6561 66 : break;
6562 0 : default:
6563 0 : elog(ERROR, "unrecognized constraint type: %d",
6564 : (int) con->contype);
6565 : }
6566 : }
6567 :
6568 482984 : if (partqualstate && !ExecCheck(partqualstate, econtext))
6569 : {
6570 49 : if (tab->validate_default)
6571 17 : ereport(ERROR,
6572 : (errcode(ERRCODE_CHECK_VIOLATION),
6573 : errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
6574 : RelationGetRelationName(oldrel)),
6575 : errtable(oldrel)));
6576 : else
6577 32 : ereport(ERROR,
6578 : (errcode(ERRCODE_CHECK_VIOLATION),
6579 : errmsg("partition constraint of relation \"%s\" is violated by some row",
6580 : RelationGetRelationName(oldrel)),
6581 : errtable(oldrel)));
6582 : }
6583 :
6584 : /* Write the tuple out to the new relation */
6585 482935 : if (newrel)
6586 66407 : table_tuple_insert(newrel, insertslot, mycid,
6587 : ti_options, bistate);
6588 :
6589 482935 : ResetExprContext(econtext);
6590 :
6591 482935 : CHECK_FOR_INTERRUPTS();
6592 : }
6593 :
6594 3222 : MemoryContextSwitchTo(oldCxt);
6595 3222 : table_endscan(scan);
6596 3222 : UnregisterSnapshot(snapshot);
6597 :
6598 3222 : ExecDropSingleTupleTableSlot(oldslot);
6599 3222 : if (newslot)
6600 712 : ExecDropSingleTupleTableSlot(newslot);
6601 : }
6602 :
6603 3830 : FreeExecutorState(estate);
6604 :
6605 3830 : table_close(oldrel, NoLock);
6606 3830 : if (newrel)
6607 : {
6608 712 : FreeBulkInsertState(bistate);
6609 :
6610 712 : table_finish_bulk_insert(newrel, ti_options);
6611 :
6612 712 : table_close(newrel, NoLock);
6613 : }
6614 3830 : }
6615 :
6616 : /*
6617 : * ATGetQueueEntry: find or create an entry in the ALTER TABLE work queue
6618 : */
6619 : static AlteredTableInfo *
6620 27878 : ATGetQueueEntry(List **wqueue, Relation rel)
6621 : {
6622 27878 : Oid relid = RelationGetRelid(rel);
6623 : AlteredTableInfo *tab;
6624 : ListCell *ltab;
6625 :
6626 36154 : foreach(ltab, *wqueue)
6627 : {
6628 12003 : tab = (AlteredTableInfo *) lfirst(ltab);
6629 12003 : if (tab->relid == relid)
6630 3727 : return tab;
6631 : }
6632 :
6633 : /*
6634 : * Not there, so add it. Note that we make a copy of the relation's
6635 : * existing descriptor before anything interesting can happen to it.
6636 : */
6637 24151 : tab = palloc0_object(AlteredTableInfo);
6638 24151 : tab->relid = relid;
6639 24151 : tab->rel = NULL; /* set later */
6640 24151 : tab->relkind = rel->rd_rel->relkind;
6641 24151 : tab->oldDesc = CreateTupleDescCopyConstr(RelationGetDescr(rel));
6642 24151 : tab->newAccessMethod = InvalidOid;
6643 24151 : tab->chgAccessMethod = false;
6644 24151 : tab->newTableSpace = InvalidOid;
6645 24151 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
6646 24151 : tab->chgPersistence = false;
6647 :
6648 24151 : *wqueue = lappend(*wqueue, tab);
6649 :
6650 24151 : return tab;
6651 : }
6652 :
6653 : static const char *
6654 73 : alter_table_type_to_string(AlterTableType cmdtype)
6655 : {
6656 73 : switch (cmdtype)
6657 : {
6658 0 : case AT_AddColumn:
6659 : case AT_AddColumnToView:
6660 0 : return "ADD COLUMN";
6661 0 : case AT_ColumnDefault:
6662 : case AT_CookedColumnDefault:
6663 0 : return "ALTER COLUMN ... SET DEFAULT";
6664 4 : case AT_DropNotNull:
6665 4 : return "ALTER COLUMN ... DROP NOT NULL";
6666 4 : case AT_SetNotNull:
6667 4 : return "ALTER COLUMN ... SET NOT NULL";
6668 0 : case AT_SetExpression:
6669 0 : return "ALTER COLUMN ... SET EXPRESSION";
6670 0 : case AT_DropExpression:
6671 0 : return "ALTER COLUMN ... DROP EXPRESSION";
6672 0 : case AT_SetStatistics:
6673 0 : return "ALTER COLUMN ... SET STATISTICS";
6674 8 : case AT_SetOptions:
6675 8 : return "ALTER COLUMN ... SET";
6676 0 : case AT_ResetOptions:
6677 0 : return "ALTER COLUMN ... RESET";
6678 0 : case AT_SetStorage:
6679 0 : return "ALTER COLUMN ... SET STORAGE";
6680 0 : case AT_SetCompression:
6681 0 : return "ALTER COLUMN ... SET COMPRESSION";
6682 4 : case AT_DropColumn:
6683 4 : return "DROP COLUMN";
6684 0 : case AT_AddIndex:
6685 : case AT_ReAddIndex:
6686 0 : return NULL; /* not real grammar */
6687 0 : case AT_AddConstraint:
6688 : case AT_ReAddConstraint:
6689 : case AT_ReAddDomainConstraint:
6690 : case AT_AddIndexConstraint:
6691 0 : return "ADD CONSTRAINT";
6692 4 : case AT_AlterConstraint:
6693 4 : return "ALTER CONSTRAINT";
6694 0 : case AT_ValidateConstraint:
6695 0 : return "VALIDATE CONSTRAINT";
6696 0 : case AT_DropConstraint:
6697 0 : return "DROP CONSTRAINT";
6698 0 : case AT_ReAddComment:
6699 0 : return NULL; /* not real grammar */
6700 0 : case AT_AlterColumnType:
6701 0 : return "ALTER COLUMN ... SET DATA TYPE";
6702 0 : case AT_AlterColumnGenericOptions:
6703 0 : return "ALTER COLUMN ... OPTIONS";
6704 0 : case AT_ChangeOwner:
6705 0 : return "OWNER TO";
6706 4 : case AT_ClusterOn:
6707 4 : return "CLUSTER ON";
6708 4 : case AT_DropCluster:
6709 4 : return "SET WITHOUT CLUSTER";
6710 0 : case AT_SetAccessMethod:
6711 0 : return "SET ACCESS METHOD";
6712 4 : case AT_SetLogged:
6713 4 : return "SET LOGGED";
6714 4 : case AT_SetUnLogged:
6715 4 : return "SET UNLOGGED";
6716 0 : case AT_DropOids:
6717 0 : return "SET WITHOUT OIDS";
6718 0 : case AT_SetTableSpace:
6719 0 : return "SET TABLESPACE";
6720 1 : case AT_SetRelOptions:
6721 1 : return "SET";
6722 0 : case AT_ResetRelOptions:
6723 0 : return "RESET";
6724 0 : case AT_ReplaceRelOptions:
6725 0 : return NULL; /* not real grammar */
6726 0 : case AT_EnableTrig:
6727 0 : return "ENABLE TRIGGER";
6728 0 : case AT_EnableAlwaysTrig:
6729 0 : return "ENABLE ALWAYS TRIGGER";
6730 0 : case AT_EnableReplicaTrig:
6731 0 : return "ENABLE REPLICA TRIGGER";
6732 0 : case AT_DisableTrig:
6733 0 : return "DISABLE TRIGGER";
6734 0 : case AT_EnableTrigAll:
6735 0 : return "ENABLE TRIGGER ALL";
6736 0 : case AT_DisableTrigAll:
6737 0 : return "DISABLE TRIGGER ALL";
6738 0 : case AT_EnableTrigUser:
6739 0 : return "ENABLE TRIGGER USER";
6740 0 : case AT_DisableTrigUser:
6741 0 : return "DISABLE TRIGGER USER";
6742 0 : case AT_EnableRule:
6743 0 : return "ENABLE RULE";
6744 0 : case AT_EnableAlwaysRule:
6745 0 : return "ENABLE ALWAYS RULE";
6746 0 : case AT_EnableReplicaRule:
6747 0 : return "ENABLE REPLICA RULE";
6748 0 : case AT_DisableRule:
6749 0 : return "DISABLE RULE";
6750 4 : case AT_AddInherit:
6751 4 : return "INHERIT";
6752 4 : case AT_DropInherit:
6753 4 : return "NO INHERIT";
6754 0 : case AT_AddOf:
6755 0 : return "OF";
6756 0 : case AT_DropOf:
6757 0 : return "NOT OF";
6758 0 : case AT_ReplicaIdentity:
6759 0 : return "REPLICA IDENTITY";
6760 0 : case AT_EnableRowSecurity:
6761 0 : return "ENABLE ROW SECURITY";
6762 0 : case AT_DisableRowSecurity:
6763 0 : return "DISABLE ROW SECURITY";
6764 0 : case AT_ForceRowSecurity:
6765 0 : return "FORCE ROW SECURITY";
6766 0 : case AT_NoForceRowSecurity:
6767 0 : return "NO FORCE ROW SECURITY";
6768 0 : case AT_GenericOptions:
6769 0 : return "OPTIONS";
6770 4 : case AT_AttachPartition:
6771 4 : return "ATTACH PARTITION";
6772 12 : case AT_DetachPartition:
6773 12 : return "DETACH PARTITION";
6774 4 : case AT_DetachPartitionFinalize:
6775 4 : return "DETACH PARTITION ... FINALIZE";
6776 0 : case AT_MergePartitions:
6777 0 : return "MERGE PARTITIONS";
6778 4 : case AT_SplitPartition:
6779 4 : return "SPLIT PARTITION";
6780 0 : case AT_AddIdentity:
6781 0 : return "ALTER COLUMN ... ADD IDENTITY";
6782 0 : case AT_SetIdentity:
6783 0 : return "ALTER COLUMN ... SET";
6784 0 : case AT_DropIdentity:
6785 0 : return "ALTER COLUMN ... DROP IDENTITY";
6786 0 : case AT_ReAddStatistics:
6787 0 : return NULL; /* not real grammar */
6788 : }
6789 :
6790 0 : return NULL;
6791 : }
6792 :
6793 : /*
6794 : * ATSimplePermissions
6795 : *
6796 : * - Ensure that it is a relation (or possibly a view)
6797 : * - Ensure this user is the owner
6798 : * - Ensure that it is not a system table
6799 : */
6800 : static void
6801 24718 : ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets)
6802 : {
6803 : int actual_target;
6804 :
6805 24718 : switch (rel->rd_rel->relkind)
6806 : {
6807 18989 : case RELKIND_RELATION:
6808 18989 : actual_target = ATT_TABLE;
6809 18989 : break;
6810 4253 : case RELKIND_PARTITIONED_TABLE:
6811 4253 : actual_target = ATT_PARTITIONED_TABLE;
6812 4253 : break;
6813 276 : case RELKIND_VIEW:
6814 276 : actual_target = ATT_VIEW;
6815 276 : break;
6816 30 : case RELKIND_MATVIEW:
6817 30 : actual_target = ATT_MATVIEW;
6818 30 : break;
6819 145 : case RELKIND_INDEX:
6820 145 : actual_target = ATT_INDEX;
6821 145 : break;
6822 275 : case RELKIND_PARTITIONED_INDEX:
6823 275 : actual_target = ATT_PARTITIONED_INDEX;
6824 275 : break;
6825 141 : case RELKIND_COMPOSITE_TYPE:
6826 141 : actual_target = ATT_COMPOSITE_TYPE;
6827 141 : break;
6828 592 : case RELKIND_FOREIGN_TABLE:
6829 592 : actual_target = ATT_FOREIGN_TABLE;
6830 592 : break;
6831 16 : case RELKIND_SEQUENCE:
6832 16 : actual_target = ATT_SEQUENCE;
6833 16 : break;
6834 1 : default:
6835 1 : actual_target = 0;
6836 1 : break;
6837 : }
6838 :
6839 : /* Wrong target type? */
6840 24718 : if ((actual_target & allowed_targets) == 0)
6841 : {
6842 73 : const char *action_str = alter_table_type_to_string(cmdtype);
6843 :
6844 73 : if (action_str)
6845 73 : ereport(ERROR,
6846 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
6847 : /* translator: %s is a group of some SQL keywords */
6848 : errmsg("ALTER action %s cannot be performed on relation \"%s\"",
6849 : action_str, RelationGetRelationName(rel)),
6850 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
6851 : else
6852 : /* internal error? */
6853 0 : elog(ERROR, "invalid ALTER action attempted on relation \"%s\"",
6854 : RelationGetRelationName(rel));
6855 : }
6856 :
6857 : /* Permissions checks */
6858 24645 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(rel), GetUserId()))
6859 8 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
6860 8 : RelationGetRelationName(rel));
6861 :
6862 24637 : if (!allowSystemTableMods && IsSystemRelation(rel))
6863 0 : ereport(ERROR,
6864 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6865 : errmsg("permission denied: \"%s\" is a system catalog",
6866 : RelationGetRelationName(rel))));
6867 24637 : }
6868 :
6869 : /*
6870 : * ATSimpleRecursion
6871 : *
6872 : * Simple table recursion sufficient for most ALTER TABLE operations.
6873 : * All direct and indirect children are processed in an unspecified order.
6874 : * Note that if a child inherits from the original table via multiple
6875 : * inheritance paths, it will be visited just once.
6876 : */
6877 : static void
6878 897 : ATSimpleRecursion(List **wqueue, Relation rel,
6879 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
6880 : AlterTableUtilityContext *context)
6881 : {
6882 : /*
6883 : * Propagate to children, if desired and if there are (or might be) any
6884 : * children.
6885 : */
6886 897 : if (recurse && rel->rd_rel->relhassubclass)
6887 : {
6888 55 : Oid relid = RelationGetRelid(rel);
6889 : ListCell *child;
6890 : List *children;
6891 :
6892 55 : children = find_all_inheritors(relid, lockmode, NULL);
6893 :
6894 : /*
6895 : * find_all_inheritors does the recursive search of the inheritance
6896 : * hierarchy, so all we have to do is process all of the relids in the
6897 : * list that it returns.
6898 : */
6899 240 : foreach(child, children)
6900 : {
6901 185 : Oid childrelid = lfirst_oid(child);
6902 : Relation childrel;
6903 :
6904 185 : if (childrelid == relid)
6905 55 : continue;
6906 : /* find_all_inheritors already got lock */
6907 130 : childrel = relation_open(childrelid, NoLock);
6908 130 : CheckAlterTableIsSafe(childrel);
6909 130 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
6910 130 : relation_close(childrel, NoLock);
6911 : }
6912 : }
6913 897 : }
6914 :
6915 : /*
6916 : * Obtain list of partitions of the given table, locking them all at the given
6917 : * lockmode and ensuring that they all pass CheckAlterTableIsSafe.
6918 : *
6919 : * This function is a no-op if the given relation is not a partitioned table;
6920 : * in particular, nothing is done if it's a legacy inheritance parent.
6921 : */
6922 : static void
6923 553 : ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode)
6924 : {
6925 553 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6926 : {
6927 : List *inh;
6928 : ListCell *cell;
6929 :
6930 121 : inh = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
6931 : /* first element is the parent rel; must ignore it */
6932 398 : for_each_from(cell, inh, 1)
6933 : {
6934 : Relation childrel;
6935 :
6936 : /* find_all_inheritors already got lock */
6937 281 : childrel = table_open(lfirst_oid(cell), NoLock);
6938 281 : CheckAlterTableIsSafe(childrel);
6939 277 : table_close(childrel, NoLock);
6940 : }
6941 117 : list_free(inh);
6942 : }
6943 549 : }
6944 :
6945 : /*
6946 : * ATTypedTableRecursion
6947 : *
6948 : * Propagate ALTER TYPE operations to the typed tables of that type.
6949 : * Also check the RESTRICT/CASCADE behavior. Given CASCADE, also permit
6950 : * recursion to inheritance children of the typed tables.
6951 : */
6952 : static void
6953 125 : ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
6954 : LOCKMODE lockmode, AlterTableUtilityContext *context)
6955 : {
6956 : ListCell *child;
6957 : List *children;
6958 :
6959 : Assert(rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
6960 :
6961 125 : children = find_typed_table_dependencies(rel->rd_rel->reltype,
6962 125 : RelationGetRelationName(rel),
6963 : cmd->behavior);
6964 :
6965 133 : foreach(child, children)
6966 : {
6967 20 : Oid childrelid = lfirst_oid(child);
6968 : Relation childrel;
6969 :
6970 20 : childrel = relation_open(childrelid, lockmode);
6971 20 : CheckAlterTableIsSafe(childrel);
6972 20 : ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode, context);
6973 20 : relation_close(childrel, NoLock);
6974 : }
6975 113 : }
6976 :
6977 :
6978 : /*
6979 : * find_composite_type_dependencies
6980 : *
6981 : * Check to see if the type "typeOid" is being used as a column in some table
6982 : * (possibly nested several levels deep in composite types, arrays, etc!).
6983 : * Eventually, we'd like to propagate the check or rewrite operation
6984 : * into such tables, but for now, just error out if we find any.
6985 : *
6986 : * Caller should provide either the associated relation of a rowtype,
6987 : * or a type name (not both) for use in the error message, if any.
6988 : *
6989 : * Note that "typeOid" is not necessarily a composite type; it could also be
6990 : * another container type such as an array or range, or a domain over one of
6991 : * these things. The name of this function is therefore somewhat historical,
6992 : * but it's not worth changing.
6993 : *
6994 : * We assume that functions and views depending on the type are not reasons
6995 : * to reject the ALTER. (How safe is this really?)
6996 : */
6997 : void
6998 3243 : find_composite_type_dependencies(Oid typeOid, Relation origRelation,
6999 : const char *origTypeName)
7000 : {
7001 : Relation depRel;
7002 : ScanKeyData key[2];
7003 : SysScanDesc depScan;
7004 : HeapTuple depTup;
7005 :
7006 : /* since this function recurses, it could be driven to stack overflow */
7007 3243 : check_stack_depth();
7008 :
7009 : /*
7010 : * We scan pg_depend to find those things that depend on the given type.
7011 : * (We assume we can ignore refobjsubid for a type.)
7012 : */
7013 3243 : depRel = table_open(DependRelationId, AccessShareLock);
7014 :
7015 3243 : ScanKeyInit(&key[0],
7016 : Anum_pg_depend_refclassid,
7017 : BTEqualStrategyNumber, F_OIDEQ,
7018 : ObjectIdGetDatum(TypeRelationId));
7019 3243 : ScanKeyInit(&key[1],
7020 : Anum_pg_depend_refobjid,
7021 : BTEqualStrategyNumber, F_OIDEQ,
7022 : ObjectIdGetDatum(typeOid));
7023 :
7024 3243 : depScan = systable_beginscan(depRel, DependReferenceIndexId, true,
7025 : NULL, 2, key);
7026 :
7027 4976 : while (HeapTupleIsValid(depTup = systable_getnext(depScan)))
7028 : {
7029 1837 : Form_pg_depend pg_depend = (Form_pg_depend) GETSTRUCT(depTup);
7030 : Relation rel;
7031 : TupleDesc tupleDesc;
7032 : Form_pg_attribute att;
7033 :
7034 : /* Check for directly dependent types */
7035 1837 : if (pg_depend->classid == TypeRelationId)
7036 : {
7037 : /*
7038 : * This must be an array, domain, or range containing the given
7039 : * type, so recursively check for uses of this type. Note that
7040 : * any error message will mention the original type not the
7041 : * container; this is intentional.
7042 : */
7043 1567 : find_composite_type_dependencies(pg_depend->objid,
7044 : origRelation, origTypeName);
7045 1551 : continue;
7046 : }
7047 :
7048 : /* Else, ignore dependees that aren't relations */
7049 270 : if (pg_depend->classid != RelationRelationId)
7050 81 : continue;
7051 :
7052 189 : rel = relation_open(pg_depend->objid, AccessShareLock);
7053 189 : tupleDesc = RelationGetDescr(rel);
7054 :
7055 : /*
7056 : * If objsubid identifies a specific column, refer to that in error
7057 : * messages. Otherwise, search to see if there's a user column of the
7058 : * type. (We assume system columns are never of interesting types.)
7059 : * The search is needed because an index containing an expression
7060 : * column of the target type will just be recorded as a whole-relation
7061 : * dependency. If we do not find a column of the type, the dependency
7062 : * must indicate that the type is transiently referenced in an index
7063 : * expression but not stored on disk, which we assume is OK, just as
7064 : * we do for references in views. (It could also be that the target
7065 : * type is embedded in some container type that is stored in an index
7066 : * column, but the previous recursion should catch such cases.)
7067 : */
7068 189 : if (pg_depend->objsubid > 0 && pg_depend->objsubid <= tupleDesc->natts)
7069 84 : att = TupleDescAttr(tupleDesc, pg_depend->objsubid - 1);
7070 : else
7071 : {
7072 105 : att = NULL;
7073 270 : for (int attno = 1; attno <= tupleDesc->natts; attno++)
7074 : {
7075 169 : att = TupleDescAttr(tupleDesc, attno - 1);
7076 169 : if (att->atttypid == typeOid && !att->attisdropped)
7077 4 : break;
7078 165 : att = NULL;
7079 : }
7080 105 : if (att == NULL)
7081 : {
7082 : /* No such column, so assume OK */
7083 101 : relation_close(rel, AccessShareLock);
7084 101 : continue;
7085 : }
7086 : }
7087 :
7088 : /*
7089 : * We definitely should reject if the relation has storage. If it's
7090 : * partitioned, then perhaps we don't have to reject: if there are
7091 : * partitions then we'll fail when we find one, else there is no
7092 : * stored data to worry about. However, it's possible that the type
7093 : * change would affect conclusions about whether the type is sortable
7094 : * or hashable and thus (if it's a partitioning column) break the
7095 : * partitioning rule. For now, reject for partitioned rels too.
7096 : */
7097 88 : if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind) ||
7098 0 : RELKIND_HAS_PARTITIONS(rel->rd_rel->relkind))
7099 : {
7100 88 : if (origTypeName)
7101 20 : ereport(ERROR,
7102 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7103 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7104 : origTypeName,
7105 : RelationGetRelationName(rel),
7106 : NameStr(att->attname))));
7107 68 : else if (origRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7108 12 : ereport(ERROR,
7109 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7110 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7111 : RelationGetRelationName(origRelation),
7112 : RelationGetRelationName(rel),
7113 : NameStr(att->attname))));
7114 56 : else if (origRelation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
7115 4 : ereport(ERROR,
7116 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7117 : errmsg("cannot alter foreign table \"%s\" because column \"%s.%s\" uses its row type",
7118 : RelationGetRelationName(origRelation),
7119 : RelationGetRelationName(rel),
7120 : NameStr(att->attname))));
7121 : else
7122 52 : ereport(ERROR,
7123 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7124 : errmsg("cannot alter table \"%s\" because column \"%s.%s\" uses its row type",
7125 : RelationGetRelationName(origRelation),
7126 : RelationGetRelationName(rel),
7127 : NameStr(att->attname))));
7128 : }
7129 0 : else if (OidIsValid(rel->rd_rel->reltype))
7130 : {
7131 : /*
7132 : * A view or composite type itself isn't a problem, but we must
7133 : * recursively check for indirect dependencies via its rowtype.
7134 : */
7135 0 : find_composite_type_dependencies(rel->rd_rel->reltype,
7136 : origRelation, origTypeName);
7137 : }
7138 :
7139 0 : relation_close(rel, AccessShareLock);
7140 : }
7141 :
7142 3139 : systable_endscan(depScan);
7143 :
7144 3139 : relation_close(depRel, AccessShareLock);
7145 3139 : }
7146 :
7147 :
7148 : /*
7149 : * find_typed_table_dependencies
7150 : *
7151 : * Check to see if a composite type is being used as the type of a
7152 : * typed table. Abort if any are found and behavior is RESTRICT.
7153 : * Else return the list of tables.
7154 : */
7155 : static List *
7156 141 : find_typed_table_dependencies(Oid typeOid, const char *typeName, DropBehavior behavior)
7157 : {
7158 : Relation classRel;
7159 : ScanKeyData key[1];
7160 : TableScanDesc scan;
7161 : HeapTuple tuple;
7162 141 : List *result = NIL;
7163 :
7164 141 : classRel = table_open(RelationRelationId, AccessShareLock);
7165 :
7166 141 : ScanKeyInit(&key[0],
7167 : Anum_pg_class_reloftype,
7168 : BTEqualStrategyNumber, F_OIDEQ,
7169 : ObjectIdGetDatum(typeOid));
7170 :
7171 141 : scan = table_beginscan_catalog(classRel, 1, key);
7172 :
7173 165 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
7174 : {
7175 40 : Form_pg_class classform = (Form_pg_class) GETSTRUCT(tuple);
7176 :
7177 40 : if (behavior == DROP_RESTRICT)
7178 16 : ereport(ERROR,
7179 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
7180 : errmsg("cannot alter type \"%s\" because it is the type of a typed table",
7181 : typeName),
7182 : errhint("Use ALTER ... CASCADE to alter the typed tables too.")));
7183 : else
7184 24 : result = lappend_oid(result, classform->oid);
7185 : }
7186 :
7187 125 : table_endscan(scan);
7188 125 : table_close(classRel, AccessShareLock);
7189 :
7190 125 : return result;
7191 : }
7192 :
7193 :
7194 : /*
7195 : * check_of_type
7196 : *
7197 : * Check whether a type is suitable for CREATE TABLE OF/ALTER TABLE OF. If it
7198 : * isn't suitable, throw an error. Currently, we require that the type
7199 : * originated with CREATE TYPE AS. We could support any row type, but doing so
7200 : * would require handling a number of extra corner cases in the DDL commands.
7201 : * (Also, allowing domain-over-composite would open up a can of worms about
7202 : * whether and how the domain's constraints should apply to derived tables.)
7203 : */
7204 : void
7205 119 : check_of_type(HeapTuple typetuple)
7206 : {
7207 119 : Form_pg_type typ = (Form_pg_type) GETSTRUCT(typetuple);
7208 119 : bool typeOk = false;
7209 :
7210 119 : if (typ->typtype == TYPTYPE_COMPOSITE)
7211 : {
7212 : Relation typeRelation;
7213 :
7214 : Assert(OidIsValid(typ->typrelid));
7215 115 : typeRelation = relation_open(typ->typrelid, AccessShareLock);
7216 115 : typeOk = (typeRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
7217 :
7218 : /*
7219 : * Close the parent rel, but keep our AccessShareLock on it until xact
7220 : * commit. That will prevent someone else from deleting or ALTERing
7221 : * the type before the typed table creation/conversion commits.
7222 : */
7223 115 : relation_close(typeRelation, NoLock);
7224 :
7225 115 : if (!typeOk)
7226 4 : ereport(ERROR,
7227 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7228 : errmsg("type %s is the row type of another table",
7229 : format_type_be(typ->oid)),
7230 : errdetail("A typed table must use a stand-alone composite type created with CREATE TYPE.")));
7231 : }
7232 : else
7233 4 : ereport(ERROR,
7234 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7235 : errmsg("type %s is not a composite type",
7236 : format_type_be(typ->oid))));
7237 111 : }
7238 :
7239 :
7240 : /*
7241 : * ALTER TABLE ADD COLUMN
7242 : *
7243 : * Adds an additional attribute to a relation making the assumption that
7244 : * CHECK, NOT NULL, and FOREIGN KEY constraints will be removed from the
7245 : * AT_AddColumn AlterTableCmd by parse_utilcmd.c and added as independent
7246 : * AlterTableCmd's.
7247 : *
7248 : * ADD COLUMN cannot use the normal ALTER TABLE recursion mechanism, because we
7249 : * have to decide at runtime whether to recurse or not depending on whether we
7250 : * actually add a column or merely merge with an existing column. (We can't
7251 : * check this in a static pre-pass because it won't handle multiple inheritance
7252 : * situations correctly.)
7253 : */
7254 : static void
7255 1581 : ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
7256 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
7257 : AlterTableUtilityContext *context)
7258 : {
7259 1581 : if (rel->rd_rel->reloftype && !recursing)
7260 4 : ereport(ERROR,
7261 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7262 : errmsg("cannot add column to typed table")));
7263 :
7264 1577 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7265 38 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
7266 :
7267 1573 : if (recurse && !is_view)
7268 1502 : cmd->recurse = true;
7269 1573 : }
7270 :
7271 : /*
7272 : * Add a column to a table. The return value is the address of the
7273 : * new column in the parent relation.
7274 : *
7275 : * cmd is pass-by-ref so that we can replace it with the parse-transformed
7276 : * copy (but that happens only after we check for IF NOT EXISTS).
7277 : */
7278 : static ObjectAddress
7279 2059 : ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
7280 : AlterTableCmd **cmd, bool recurse, bool recursing,
7281 : LOCKMODE lockmode, AlterTablePass cur_pass,
7282 : AlterTableUtilityContext *context)
7283 : {
7284 2059 : Oid myrelid = RelationGetRelid(rel);
7285 2059 : ColumnDef *colDef = castNode(ColumnDef, (*cmd)->def);
7286 2059 : bool if_not_exists = (*cmd)->missing_ok;
7287 : Relation pgclass,
7288 : attrdesc;
7289 : HeapTuple reltup;
7290 : Form_pg_class relform;
7291 : Form_pg_attribute attribute;
7292 : int newattnum;
7293 : char relkind;
7294 : Expr *defval;
7295 : List *children;
7296 : ListCell *child;
7297 : AlterTableCmd *childcmd;
7298 : ObjectAddress address;
7299 : TupleDesc tupdesc;
7300 :
7301 : /* since this function recurses, it could be driven to stack overflow */
7302 2059 : check_stack_depth();
7303 :
7304 : /* At top level, permission check was done in ATPrepCmd, else do it */
7305 2059 : if (recursing)
7306 490 : ATSimplePermissions((*cmd)->subtype, rel,
7307 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
7308 :
7309 2059 : if (rel->rd_rel->relispartition && !recursing)
7310 8 : ereport(ERROR,
7311 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7312 : errmsg("cannot add column to a partition")));
7313 :
7314 2051 : attrdesc = table_open(AttributeRelationId, RowExclusiveLock);
7315 :
7316 : /*
7317 : * Are we adding the column to a recursion child? If so, check whether to
7318 : * merge with an existing definition for the column. If we do merge, we
7319 : * must not recurse. Children will already have the column, and recursing
7320 : * into them would mess up attinhcount.
7321 : */
7322 2051 : if (colDef->inhcount > 0)
7323 : {
7324 : HeapTuple tuple;
7325 :
7326 : /* Does child already have a column by this name? */
7327 490 : tuple = SearchSysCacheCopyAttName(myrelid, colDef->colname);
7328 490 : if (HeapTupleIsValid(tuple))
7329 : {
7330 40 : Form_pg_attribute childatt = (Form_pg_attribute) GETSTRUCT(tuple);
7331 : Oid ctypeId;
7332 : int32 ctypmod;
7333 : Oid ccollid;
7334 :
7335 : /* Child column must match on type, typmod, and collation */
7336 40 : typenameTypeIdAndMod(NULL, colDef->typeName, &ctypeId, &ctypmod);
7337 40 : if (ctypeId != childatt->atttypid ||
7338 40 : ctypmod != childatt->atttypmod)
7339 0 : ereport(ERROR,
7340 : (errcode(ERRCODE_DATATYPE_MISMATCH),
7341 : errmsg("child table \"%s\" has different type for column \"%s\"",
7342 : RelationGetRelationName(rel), colDef->colname)));
7343 40 : ccollid = GetColumnDefCollation(NULL, colDef, ctypeId);
7344 40 : if (ccollid != childatt->attcollation)
7345 0 : ereport(ERROR,
7346 : (errcode(ERRCODE_COLLATION_MISMATCH),
7347 : errmsg("child table \"%s\" has different collation for column \"%s\"",
7348 : RelationGetRelationName(rel), colDef->colname),
7349 : errdetail("\"%s\" versus \"%s\"",
7350 : get_collation_name(ccollid),
7351 : get_collation_name(childatt->attcollation))));
7352 :
7353 : /* Bump the existing child att's inhcount */
7354 40 : if (pg_add_s16_overflow(childatt->attinhcount, 1,
7355 : &childatt->attinhcount))
7356 0 : ereport(ERROR,
7357 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7358 : errmsg("too many inheritance parents"));
7359 40 : CatalogTupleUpdate(attrdesc, &tuple->t_self, tuple);
7360 :
7361 40 : heap_freetuple(tuple);
7362 :
7363 : /* Inform the user about the merge */
7364 40 : ereport(NOTICE,
7365 : (errmsg("merging definition of column \"%s\" for child \"%s\"",
7366 : colDef->colname, RelationGetRelationName(rel))));
7367 :
7368 40 : table_close(attrdesc, RowExclusiveLock);
7369 :
7370 : /* Make the child column change visible */
7371 40 : CommandCounterIncrement();
7372 :
7373 40 : return InvalidObjectAddress;
7374 : }
7375 : }
7376 :
7377 : /* skip if the name already exists and if_not_exists is true */
7378 2011 : if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
7379 : {
7380 44 : table_close(attrdesc, RowExclusiveLock);
7381 44 : return InvalidObjectAddress;
7382 : }
7383 :
7384 : /*
7385 : * Okay, we need to add the column, so go ahead and do parse
7386 : * transformation. This can result in queueing up, or even immediately
7387 : * executing, subsidiary operations (such as creation of unique indexes);
7388 : * so we mustn't do it until we have made the if_not_exists check.
7389 : *
7390 : * When recursing, the command was already transformed and we needn't do
7391 : * so again. Also, if context isn't given we can't transform. (That
7392 : * currently happens only for AT_AddColumnToView; we expect that view.c
7393 : * passed us a ColumnDef that doesn't need work.)
7394 : */
7395 1947 : if (context != NULL && !recursing)
7396 : {
7397 1476 : *cmd = ATParseTransformCmd(wqueue, tab, rel, *cmd, recurse, lockmode,
7398 : cur_pass, context);
7399 : Assert(*cmd != NULL);
7400 1472 : colDef = castNode(ColumnDef, (*cmd)->def);
7401 : }
7402 :
7403 : /*
7404 : * Regular inheritance children are independent enough not to inherit the
7405 : * identity column from parent hence cannot recursively add identity
7406 : * column if the table has inheritance children.
7407 : *
7408 : * Partitions, on the other hand, are integral part of a partitioned table
7409 : * and inherit identity column. Hence propagate identity column down the
7410 : * partition hierarchy.
7411 : */
7412 1943 : if (colDef->identity &&
7413 36 : recurse &&
7414 68 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE &&
7415 32 : find_inheritance_children(myrelid, NoLock) != NIL)
7416 4 : ereport(ERROR,
7417 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7418 : errmsg("cannot recursively add identity column to table that has child tables")));
7419 :
7420 1939 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
7421 :
7422 1939 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
7423 1939 : if (!HeapTupleIsValid(reltup))
7424 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
7425 1939 : relform = (Form_pg_class) GETSTRUCT(reltup);
7426 1939 : relkind = relform->relkind;
7427 :
7428 : /* Determine the new attribute's number */
7429 1939 : newattnum = relform->relnatts + 1;
7430 1939 : if (newattnum > MaxHeapAttributeNumber)
7431 0 : ereport(ERROR,
7432 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
7433 : errmsg("tables can have at most %d columns",
7434 : MaxHeapAttributeNumber)));
7435 :
7436 : /*
7437 : * Construct new attribute's pg_attribute entry.
7438 : */
7439 1939 : tupdesc = BuildDescForRelation(list_make1(colDef));
7440 :
7441 1931 : attribute = TupleDescAttr(tupdesc, 0);
7442 :
7443 : /* Fix up attribute number */
7444 1931 : attribute->attnum = newattnum;
7445 :
7446 : /* make sure datatype is legal for a column */
7447 3862 : CheckAttributeType(NameStr(attribute->attname), attribute->atttypid, attribute->attcollation,
7448 1931 : list_make1_oid(rel->rd_rel->reltype),
7449 1931 : (attribute->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
7450 :
7451 1903 : InsertPgAttributeTuples(attrdesc, tupdesc, myrelid, NULL, NULL);
7452 :
7453 1903 : table_close(attrdesc, RowExclusiveLock);
7454 :
7455 : /*
7456 : * Update pg_class tuple as appropriate
7457 : */
7458 1903 : relform->relnatts = newattnum;
7459 :
7460 1903 : CatalogTupleUpdate(pgclass, &reltup->t_self, reltup);
7461 :
7462 1903 : heap_freetuple(reltup);
7463 :
7464 : /* Post creation hook for new attribute */
7465 1903 : InvokeObjectPostCreateHook(RelationRelationId, myrelid, newattnum);
7466 :
7467 1903 : table_close(pgclass, RowExclusiveLock);
7468 :
7469 : /* Make the attribute's catalog entry visible */
7470 1903 : CommandCounterIncrement();
7471 :
7472 : /*
7473 : * Store the DEFAULT, if any, in the catalogs
7474 : */
7475 1903 : if (colDef->raw_default)
7476 : {
7477 : RawColumnDefault *rawEnt;
7478 :
7479 705 : rawEnt = palloc_object(RawColumnDefault);
7480 705 : rawEnt->attnum = attribute->attnum;
7481 705 : rawEnt->raw_default = copyObject(colDef->raw_default);
7482 705 : rawEnt->generated = colDef->generated;
7483 :
7484 : /*
7485 : * This function is intended for CREATE TABLE, so it processes a
7486 : * _list_ of defaults, but we just do one.
7487 : */
7488 705 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
7489 : false, true, false, NULL);
7490 :
7491 : /* Make the additional catalog changes visible */
7492 617 : CommandCounterIncrement();
7493 : }
7494 :
7495 : /*
7496 : * Tell Phase 3 to fill in the default expression, if there is one.
7497 : *
7498 : * If there is no default, Phase 3 doesn't have to do anything, because
7499 : * that effectively means that the default is NULL. The heap tuple access
7500 : * routines always check for attnum > # of attributes in tuple, and return
7501 : * NULL if so, so without any modification of the tuple data we will get
7502 : * the effect of NULL values in the new column.
7503 : *
7504 : * Note: we use build_column_default, and not just the cooked default
7505 : * returned by AddRelationNewConstraints, so that the right thing happens
7506 : * when a datatype's default applies.
7507 : *
7508 : * Note: it might seem that this should happen at the end of Phase 2, so
7509 : * that the effects of subsequent subcommands can be taken into account.
7510 : * It's intentional that we do it now, though. The new column should be
7511 : * filled according to what is said in the ADD COLUMN subcommand, so that
7512 : * the effects are the same as if this subcommand had been run by itself
7513 : * and the later subcommands had been issued in new ALTER TABLE commands.
7514 : *
7515 : * We can skip this entirely for relations without storage, since Phase 3
7516 : * is certainly not going to touch them.
7517 : */
7518 1815 : if (RELKIND_HAS_STORAGE(relkind))
7519 : {
7520 : bool has_domain_constraints;
7521 1557 : bool has_missing = false;
7522 1557 : bool has_volatile = false;
7523 :
7524 : /*
7525 : * For an identity column, we can't use build_column_default(),
7526 : * because the sequence ownership isn't set yet. So do it manually.
7527 : */
7528 1557 : if (colDef->identity)
7529 : {
7530 28 : NextValueExpr *nve = makeNode(NextValueExpr);
7531 :
7532 28 : nve->seqid = RangeVarGetRelid(colDef->identitySequence, NoLock, false);
7533 28 : nve->typeId = attribute->atttypid;
7534 :
7535 28 : defval = (Expr *) nve;
7536 : }
7537 : else
7538 1529 : defval = (Expr *) build_column_default(rel, attribute->attnum);
7539 :
7540 : has_domain_constraints =
7541 1557 : DomainHasConstraints(attribute->atttypid, &has_volatile);
7542 :
7543 : /*
7544 : * If the domain has volatile constraints, we must do a table rewrite
7545 : * since the constraint result could differ per row and cannot be
7546 : * evaluated once and cached as a missing value.
7547 : */
7548 1557 : if (has_volatile)
7549 12 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7550 :
7551 : /* Build CoerceToDomain(NULL) expression if needed */
7552 1557 : if (!defval && has_domain_constraints)
7553 : {
7554 : Oid baseTypeId;
7555 : int32 baseTypeMod;
7556 : Oid baseTypeColl;
7557 :
7558 12 : baseTypeMod = attribute->atttypmod;
7559 12 : baseTypeId = getBaseTypeAndTypmod(attribute->atttypid, &baseTypeMod);
7560 12 : baseTypeColl = get_typcollation(baseTypeId);
7561 12 : defval = (Expr *) makeNullConst(baseTypeId, baseTypeMod, baseTypeColl);
7562 12 : defval = (Expr *) coerce_to_target_type(NULL,
7563 : (Node *) defval,
7564 : baseTypeId,
7565 : attribute->atttypid,
7566 : attribute->atttypmod,
7567 : COERCION_ASSIGNMENT,
7568 : COERCE_IMPLICIT_CAST,
7569 : -1);
7570 12 : if (defval == NULL) /* should not happen */
7571 0 : elog(ERROR, "failed to coerce base type to domain");
7572 : }
7573 :
7574 1557 : if (defval)
7575 : {
7576 : NewColumnValue *newval;
7577 :
7578 : /* Prepare defval for execution, either here or in Phase 3 */
7579 586 : defval = expression_planner(defval);
7580 :
7581 : /* Add the new default to the newvals list */
7582 586 : newval = palloc0_object(NewColumnValue);
7583 586 : newval->attnum = attribute->attnum;
7584 586 : newval->expr = defval;
7585 586 : newval->is_generated = (colDef->generated != '\0');
7586 :
7587 586 : tab->newvals = lappend(tab->newvals, newval);
7588 :
7589 : /*
7590 : * Attempt to skip a complete table rewrite by storing the
7591 : * specified DEFAULT value outside of the heap. This is only
7592 : * allowed for plain relations and non-generated columns, and the
7593 : * default expression can't be volatile (stable is OK), and the
7594 : * domain constraint expressions can't be volatile (stable is OK).
7595 : *
7596 : * Note that contain_volatile_functions considers CoerceToDomain
7597 : * immutable, so we rely on DomainHasConstraints (called above)
7598 : * rather than checking defval alone.
7599 : *
7600 : * For domains with non-volatile constraints, we evaluate the
7601 : * default using soft error handling: if the constraint check
7602 : * fails (e.g., CHECK(value > 10) with DEFAULT 8), we fall back to
7603 : * a table rewrite. This preserves the historical behavior that
7604 : * such a failure is only raised when the table has rows.
7605 : */
7606 586 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
7607 586 : !colDef->generated &&
7608 493 : !has_volatile &&
7609 481 : !contain_volatile_functions((Node *) defval))
7610 367 : {
7611 : EState *estate;
7612 : ExprState *exprState;
7613 : Datum missingval;
7614 : bool missingIsNull;
7615 367 : ErrorSaveContext escontext = {T_ErrorSaveContext};
7616 :
7617 : /* Evaluate the default expression with soft errors */
7618 367 : estate = CreateExecutorState();
7619 367 : exprState = ExecPrepareExprWithContext(defval, estate,
7620 : (Node *) &escontext);
7621 367 : missingval = ExecEvalExpr(exprState,
7622 367 : GetPerTupleExprContext(estate),
7623 : &missingIsNull);
7624 :
7625 : /*
7626 : * If the domain constraint check failed (via errsave),
7627 : * missingval is unreliable. Fall back to a table rewrite;
7628 : * Phase 3 will re-evaluate with hard errors, so the user gets
7629 : * an error only if the table has rows.
7630 : */
7631 367 : if (escontext.error_occurred)
7632 : {
7633 24 : missingIsNull = true;
7634 24 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7635 : }
7636 :
7637 : /* If it turns out NULL, nothing to do; else store it */
7638 367 : if (!missingIsNull)
7639 : {
7640 343 : StoreAttrMissingVal(rel, attribute->attnum, missingval);
7641 : /* Make the additional catalog change visible */
7642 343 : CommandCounterIncrement();
7643 343 : has_missing = true;
7644 : }
7645 367 : FreeExecutorState(estate);
7646 : }
7647 : else
7648 : {
7649 : /*
7650 : * Failed to use missing mode. We have to do a table rewrite
7651 : * to install the value --- unless it's a virtual generated
7652 : * column.
7653 : */
7654 219 : if (colDef->generated != ATTRIBUTE_GENERATED_VIRTUAL)
7655 150 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7656 : }
7657 : }
7658 :
7659 1557 : if (!has_missing)
7660 : {
7661 : /*
7662 : * If the new column is NOT NULL, and there is no missing value,
7663 : * tell Phase 3 it needs to check for NULLs.
7664 : */
7665 1214 : tab->verify_new_notnull |= colDef->is_not_null;
7666 : }
7667 : }
7668 :
7669 : /*
7670 : * Add needed dependency entries for the new column.
7671 : */
7672 1815 : add_column_datatype_dependency(myrelid, newattnum, attribute->atttypid);
7673 1815 : add_column_collation_dependency(myrelid, newattnum, attribute->attcollation);
7674 :
7675 : /*
7676 : * Propagate to children as appropriate. Unlike most other ALTER
7677 : * routines, we have to do this one level of recursion at a time; we can't
7678 : * use find_all_inheritors to do it in one pass.
7679 : */
7680 : children =
7681 1815 : find_inheritance_children(RelationGetRelid(rel), lockmode);
7682 :
7683 : /*
7684 : * If we are told not to recurse, there had better not be any child
7685 : * tables; else the addition would put them out of step.
7686 : */
7687 1815 : if (children && !recurse)
7688 8 : ereport(ERROR,
7689 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7690 : errmsg("column must be added to child tables too")));
7691 :
7692 : /* Children should see column as singly inherited */
7693 1807 : if (!recursing)
7694 : {
7695 1357 : childcmd = copyObject(*cmd);
7696 1357 : colDef = castNode(ColumnDef, childcmd->def);
7697 1357 : colDef->inhcount = 1;
7698 1357 : colDef->is_local = false;
7699 : }
7700 : else
7701 450 : childcmd = *cmd; /* no need to copy again */
7702 :
7703 2297 : foreach(child, children)
7704 : {
7705 490 : Oid childrelid = lfirst_oid(child);
7706 : Relation childrel;
7707 : AlteredTableInfo *childtab;
7708 :
7709 : /* find_inheritance_children already got lock */
7710 490 : childrel = table_open(childrelid, NoLock);
7711 490 : CheckAlterTableIsSafe(childrel);
7712 :
7713 : /* Find or create work queue entry for this table */
7714 490 : childtab = ATGetQueueEntry(wqueue, childrel);
7715 :
7716 : /* Recurse to child; return value is ignored */
7717 490 : ATExecAddColumn(wqueue, childtab, childrel,
7718 : &childcmd, recurse, true,
7719 : lockmode, cur_pass, context);
7720 :
7721 490 : table_close(childrel, NoLock);
7722 : }
7723 :
7724 1807 : ObjectAddressSubSet(address, RelationRelationId, myrelid, newattnum);
7725 1807 : return address;
7726 : }
7727 :
7728 : /*
7729 : * If a new or renamed column will collide with the name of an existing
7730 : * column and if_not_exists is false then error out, else do nothing.
7731 : */
7732 : static bool
7733 2309 : check_for_column_name_collision(Relation rel, const char *colname,
7734 : bool if_not_exists)
7735 : {
7736 : HeapTuple attTuple;
7737 : int attnum;
7738 :
7739 : /*
7740 : * this test is deliberately not attisdropped-aware, since if one tries to
7741 : * add a column matching a dropped column name, it's gonna fail anyway.
7742 : */
7743 2309 : attTuple = SearchSysCache2(ATTNAME,
7744 : ObjectIdGetDatum(RelationGetRelid(rel)),
7745 : PointerGetDatum(colname));
7746 2309 : if (!HeapTupleIsValid(attTuple))
7747 2237 : return true;
7748 :
7749 72 : attnum = ((Form_pg_attribute) GETSTRUCT(attTuple))->attnum;
7750 72 : ReleaseSysCache(attTuple);
7751 :
7752 : /*
7753 : * We throw a different error message for conflicts with system column
7754 : * names, since they are normally not shown and the user might otherwise
7755 : * be confused about the reason for the conflict.
7756 : */
7757 72 : if (attnum <= 0)
7758 8 : ereport(ERROR,
7759 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7760 : errmsg("column name \"%s\" conflicts with a system column name",
7761 : colname)));
7762 : else
7763 : {
7764 64 : if (if_not_exists)
7765 : {
7766 44 : ereport(NOTICE,
7767 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7768 : errmsg("column \"%s\" of relation \"%s\" already exists, skipping",
7769 : colname, RelationGetRelationName(rel))));
7770 44 : return false;
7771 : }
7772 :
7773 20 : ereport(ERROR,
7774 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7775 : errmsg("column \"%s\" of relation \"%s\" already exists",
7776 : colname, RelationGetRelationName(rel))));
7777 : }
7778 :
7779 : return true;
7780 : }
7781 :
7782 : /*
7783 : * Install a column's dependency on its datatype.
7784 : */
7785 : static void
7786 2568 : add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid)
7787 : {
7788 : ObjectAddress myself,
7789 : referenced;
7790 :
7791 2568 : myself.classId = RelationRelationId;
7792 2568 : myself.objectId = relid;
7793 2568 : myself.objectSubId = attnum;
7794 2568 : referenced.classId = TypeRelationId;
7795 2568 : referenced.objectId = typid;
7796 2568 : referenced.objectSubId = 0;
7797 2568 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7798 2568 : }
7799 :
7800 : /*
7801 : * Install a column's dependency on its collation.
7802 : */
7803 : static void
7804 2568 : add_column_collation_dependency(Oid relid, int32 attnum, Oid collid)
7805 : {
7806 : ObjectAddress myself,
7807 : referenced;
7808 :
7809 : /* We know the default collation is pinned, so don't bother recording it */
7810 2568 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
7811 : {
7812 12 : myself.classId = RelationRelationId;
7813 12 : myself.objectId = relid;
7814 12 : myself.objectSubId = attnum;
7815 12 : referenced.classId = CollationRelationId;
7816 12 : referenced.objectId = collid;
7817 12 : referenced.objectSubId = 0;
7818 12 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7819 : }
7820 2568 : }
7821 :
7822 : /*
7823 : * ALTER TABLE ALTER COLUMN DROP NOT NULL
7824 : *
7825 : * Return the address of the modified column. If the column was already
7826 : * nullable, InvalidObjectAddress is returned.
7827 : */
7828 : static ObjectAddress
7829 177 : ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
7830 : LOCKMODE lockmode)
7831 : {
7832 : HeapTuple tuple;
7833 : HeapTuple conTup;
7834 : Form_pg_attribute attTup;
7835 : AttrNumber attnum;
7836 : Relation attr_rel;
7837 : ObjectAddress address;
7838 :
7839 : /*
7840 : * lookup the attribute
7841 : */
7842 177 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7843 :
7844 177 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
7845 177 : if (!HeapTupleIsValid(tuple))
7846 12 : ereport(ERROR,
7847 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7848 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7849 : colName, RelationGetRelationName(rel))));
7850 165 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
7851 165 : attnum = attTup->attnum;
7852 165 : ObjectAddressSubSet(address, RelationRelationId,
7853 : RelationGetRelid(rel), attnum);
7854 :
7855 : /* If the column is already nullable there's nothing to do. */
7856 165 : if (!attTup->attnotnull)
7857 : {
7858 0 : table_close(attr_rel, RowExclusiveLock);
7859 0 : return InvalidObjectAddress;
7860 : }
7861 :
7862 : /* Prevent them from altering a system attribute */
7863 165 : if (attnum <= 0)
7864 0 : ereport(ERROR,
7865 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7866 : errmsg("cannot alter system column \"%s\"",
7867 : colName)));
7868 :
7869 165 : if (attTup->attidentity)
7870 12 : ereport(ERROR,
7871 : (errcode(ERRCODE_SYNTAX_ERROR),
7872 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
7873 : colName, RelationGetRelationName(rel))));
7874 :
7875 : /*
7876 : * If rel is partition, shouldn't drop NOT NULL if parent has the same.
7877 : */
7878 153 : if (rel->rd_rel->relispartition)
7879 : {
7880 8 : Oid parentId = get_partition_parent(RelationGetRelid(rel), false);
7881 8 : Relation parent = table_open(parentId, AccessShareLock);
7882 8 : TupleDesc tupDesc = RelationGetDescr(parent);
7883 : AttrNumber parent_attnum;
7884 :
7885 8 : parent_attnum = get_attnum(parentId, colName);
7886 8 : if (TupleDescAttr(tupDesc, parent_attnum - 1)->attnotnull)
7887 8 : ereport(ERROR,
7888 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7889 : errmsg("column \"%s\" is marked NOT NULL in parent table",
7890 : colName)));
7891 0 : table_close(parent, AccessShareLock);
7892 : }
7893 :
7894 : /*
7895 : * Find the constraint that makes this column NOT NULL, and drop it.
7896 : * dropconstraint_internal() resets attnotnull.
7897 : */
7898 145 : conTup = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7899 145 : if (conTup == NULL)
7900 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
7901 : colName, RelationGetRelationName(rel));
7902 :
7903 : /* The normal case: we have a pg_constraint row, remove it */
7904 145 : dropconstraint_internal(rel, conTup, DROP_RESTRICT, recurse, false,
7905 : false, lockmode);
7906 109 : heap_freetuple(conTup);
7907 :
7908 109 : InvokeObjectPostAlterHook(RelationRelationId,
7909 : RelationGetRelid(rel), attnum);
7910 :
7911 109 : table_close(attr_rel, RowExclusiveLock);
7912 :
7913 109 : return address;
7914 : }
7915 :
7916 : /*
7917 : * set_attnotnull
7918 : * Helper to update/validate the pg_attribute status of a not-null
7919 : * constraint
7920 : *
7921 : * pg_attribute.attnotnull is set true, if it isn't already.
7922 : * If queue_validation is true, also set up wqueue to validate the constraint.
7923 : * wqueue may be given as NULL when validation is not needed (e.g., on table
7924 : * creation).
7925 : */
7926 : static void
7927 15209 : set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
7928 : bool is_valid, bool queue_validation)
7929 : {
7930 : Form_pg_attribute attr;
7931 : CompactAttribute *thisatt;
7932 :
7933 : Assert(!queue_validation || wqueue);
7934 :
7935 15209 : CheckAlterTableIsSafe(rel);
7936 :
7937 : /*
7938 : * Exit quickly by testing attnotnull from the tupledesc's copy of the
7939 : * attribute.
7940 : */
7941 15209 : attr = TupleDescAttr(RelationGetDescr(rel), attnum - 1);
7942 15209 : if (attr->attisdropped)
7943 0 : return;
7944 :
7945 15209 : if (!attr->attnotnull)
7946 : {
7947 : Relation attr_rel;
7948 : HeapTuple tuple;
7949 :
7950 975 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7951 :
7952 975 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
7953 975 : if (!HeapTupleIsValid(tuple))
7954 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
7955 : attnum, RelationGetRelid(rel));
7956 :
7957 975 : thisatt = TupleDescCompactAttr(RelationGetDescr(rel), attnum - 1);
7958 975 : thisatt->attnullability = ATTNULLABLE_VALID;
7959 :
7960 975 : attr = (Form_pg_attribute) GETSTRUCT(tuple);
7961 :
7962 975 : attr->attnotnull = true;
7963 975 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
7964 :
7965 : /*
7966 : * If the nullness isn't already proven by validated constraints, have
7967 : * ALTER TABLE phase 3 test for it.
7968 : */
7969 975 : if (queue_validation && wqueue &&
7970 812 : !NotNullImpliedByRelConstraints(rel, attr))
7971 : {
7972 : AlteredTableInfo *tab;
7973 :
7974 780 : tab = ATGetQueueEntry(wqueue, rel);
7975 780 : tab->verify_new_notnull = true;
7976 : }
7977 :
7978 975 : CommandCounterIncrement();
7979 :
7980 975 : table_close(attr_rel, RowExclusiveLock);
7981 975 : heap_freetuple(tuple);
7982 : }
7983 : else
7984 : {
7985 14234 : CacheInvalidateRelcache(rel);
7986 : }
7987 : }
7988 :
7989 : /*
7990 : * ALTER TABLE ALTER COLUMN SET NOT NULL
7991 : *
7992 : * Add a not-null constraint to a single table and its children. Returns
7993 : * the address of the constraint added to the parent relation, if one gets
7994 : * added, or InvalidObjectAddress otherwise.
7995 : *
7996 : * We must recurse to child tables during execution, rather than using
7997 : * ALTER TABLE's normal prep-time recursion.
7998 : */
7999 : static ObjectAddress
8000 469 : ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
8001 : bool recurse, bool recursing, LOCKMODE lockmode)
8002 : {
8003 : HeapTuple tuple;
8004 : AttrNumber attnum;
8005 : ObjectAddress address;
8006 : Constraint *constraint;
8007 : CookedConstraint *ccon;
8008 : List *cooked;
8009 469 : bool is_no_inherit = false;
8010 :
8011 : /* Guard against stack overflow due to overly deep inheritance tree. */
8012 469 : check_stack_depth();
8013 :
8014 : /* At top level, permission check was done in ATPrepCmd, else do it */
8015 469 : if (recursing)
8016 : {
8017 197 : ATSimplePermissions(AT_AddConstraint, rel,
8018 : ATT_PARTITIONED_TABLE | ATT_TABLE | ATT_FOREIGN_TABLE);
8019 : Assert(conName != NULL);
8020 : }
8021 :
8022 469 : attnum = get_attnum(RelationGetRelid(rel), colName);
8023 469 : if (attnum == InvalidAttrNumber)
8024 12 : ereport(ERROR,
8025 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8026 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8027 : colName, RelationGetRelationName(rel))));
8028 :
8029 : /* Prevent them from altering a system attribute */
8030 457 : if (attnum <= 0)
8031 0 : ereport(ERROR,
8032 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8033 : errmsg("cannot alter system column \"%s\"",
8034 : colName)));
8035 :
8036 : /* See if there's already a constraint */
8037 457 : tuple = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
8038 457 : if (HeapTupleIsValid(tuple))
8039 : {
8040 105 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
8041 105 : bool changed = false;
8042 :
8043 : /*
8044 : * Don't let a NO INHERIT constraint be changed into inherit.
8045 : */
8046 105 : if (conForm->connoinherit && recurse)
8047 8 : ereport(ERROR,
8048 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8049 : errmsg("cannot change NO INHERIT status of NOT NULL constraint \"%s\" on relation \"%s\"",
8050 : NameStr(conForm->conname),
8051 : RelationGetRelationName(rel)));
8052 :
8053 : /*
8054 : * If we find an appropriate constraint, we're almost done, but just
8055 : * need to change some properties on it: if we're recursing, increment
8056 : * coninhcount; if not, set conislocal if not already set.
8057 : */
8058 97 : if (recursing)
8059 : {
8060 68 : if (pg_add_s16_overflow(conForm->coninhcount, 1,
8061 : &conForm->coninhcount))
8062 0 : ereport(ERROR,
8063 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
8064 : errmsg("too many inheritance parents"));
8065 68 : changed = true;
8066 : }
8067 29 : else if (!conForm->conislocal)
8068 : {
8069 0 : conForm->conislocal = true;
8070 0 : changed = true;
8071 : }
8072 29 : else if (!conForm->convalidated)
8073 : {
8074 : /*
8075 : * Flip attnotnull and convalidated, and also validate the
8076 : * constraint.
8077 : */
8078 16 : return ATExecValidateConstraint(wqueue, rel, NameStr(conForm->conname),
8079 : recurse, recursing, lockmode);
8080 : }
8081 :
8082 81 : if (changed)
8083 : {
8084 : Relation constr_rel;
8085 :
8086 68 : constr_rel = table_open(ConstraintRelationId, RowExclusiveLock);
8087 :
8088 68 : CatalogTupleUpdate(constr_rel, &tuple->t_self, tuple);
8089 68 : ObjectAddressSet(address, ConstraintRelationId, conForm->oid);
8090 68 : table_close(constr_rel, RowExclusiveLock);
8091 : }
8092 :
8093 81 : if (changed)
8094 68 : return address;
8095 : else
8096 13 : return InvalidObjectAddress;
8097 : }
8098 :
8099 : /*
8100 : * If we're asked not to recurse, and children exist, raise an error for
8101 : * partitioned tables. For inheritance, we act as if NO INHERIT had been
8102 : * specified.
8103 : */
8104 372 : if (!recurse &&
8105 20 : find_inheritance_children(RelationGetRelid(rel),
8106 : NoLock) != NIL)
8107 : {
8108 12 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
8109 4 : ereport(ERROR,
8110 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8111 : errmsg("constraint must be added to child tables too"),
8112 : errhint("Do not specify the ONLY keyword."));
8113 : else
8114 8 : is_no_inherit = true;
8115 : }
8116 :
8117 : /*
8118 : * No constraint exists; we must add one. First determine a name to use,
8119 : * if we haven't already.
8120 : */
8121 348 : if (!recursing)
8122 : {
8123 : Assert(conName == NULL);
8124 223 : conName = ChooseConstraintName(RelationGetRelationName(rel),
8125 : colName, "not_null",
8126 223 : RelationGetNamespace(rel),
8127 : NIL);
8128 : }
8129 :
8130 348 : constraint = makeNotNullConstraint(makeString(colName));
8131 348 : constraint->is_no_inherit = is_no_inherit;
8132 348 : constraint->conname = conName;
8133 :
8134 : /* and do it */
8135 348 : cooked = AddRelationNewConstraints(rel, NIL, list_make1(constraint),
8136 348 : false, !recursing, false, NULL);
8137 348 : ccon = linitial(cooked);
8138 348 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
8139 :
8140 : /* Mark pg_attribute.attnotnull for the column and queue validation */
8141 348 : set_attnotnull(wqueue, rel, attnum, true, true);
8142 :
8143 348 : InvokeObjectPostAlterHook(RelationRelationId,
8144 : RelationGetRelid(rel), attnum);
8145 :
8146 : /*
8147 : * Recurse to propagate the constraint to children that don't have one.
8148 : */
8149 348 : if (recurse)
8150 : {
8151 : List *children;
8152 :
8153 332 : children = find_inheritance_children(RelationGetRelid(rel),
8154 : lockmode);
8155 :
8156 817 : foreach_oid(childoid, children)
8157 : {
8158 161 : Relation childrel = table_open(childoid, NoLock);
8159 :
8160 161 : CommandCounterIncrement();
8161 :
8162 161 : ATExecSetNotNull(wqueue, childrel, conName, colName,
8163 : recurse, true, lockmode);
8164 157 : table_close(childrel, NoLock);
8165 : }
8166 : }
8167 :
8168 344 : return address;
8169 : }
8170 :
8171 : /*
8172 : * NotNullImpliedByRelConstraints
8173 : * Does rel's existing constraints imply NOT NULL for the given attribute?
8174 : */
8175 : static bool
8176 812 : NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr)
8177 : {
8178 812 : NullTest *nnulltest = makeNode(NullTest);
8179 :
8180 1624 : nnulltest->arg = (Expr *) makeVar(1,
8181 812 : attr->attnum,
8182 : attr->atttypid,
8183 : attr->atttypmod,
8184 : attr->attcollation,
8185 : 0);
8186 812 : nnulltest->nulltesttype = IS_NOT_NULL;
8187 :
8188 : /*
8189 : * argisrow = false is correct even for a composite column, because
8190 : * attnotnull does not represent a SQL-spec IS NOT NULL test in such a
8191 : * case, just IS DISTINCT FROM NULL.
8192 : */
8193 812 : nnulltest->argisrow = false;
8194 812 : nnulltest->location = -1;
8195 :
8196 812 : if (ConstraintImpliedByRelConstraint(rel, list_make1(nnulltest), NIL))
8197 : {
8198 32 : ereport(DEBUG1,
8199 : (errmsg_internal("existing constraints on column \"%s.%s\" are sufficient to prove that it does not contain nulls",
8200 : RelationGetRelationName(rel), NameStr(attr->attname))));
8201 32 : return true;
8202 : }
8203 :
8204 780 : return false;
8205 : }
8206 :
8207 : /*
8208 : * ALTER TABLE ALTER COLUMN SET/DROP DEFAULT
8209 : *
8210 : * Return the address of the affected column.
8211 : */
8212 : static ObjectAddress
8213 383 : ATExecColumnDefault(Relation rel, const char *colName,
8214 : Node *newDefault, LOCKMODE lockmode)
8215 : {
8216 383 : TupleDesc tupdesc = RelationGetDescr(rel);
8217 : AttrNumber attnum;
8218 : ObjectAddress address;
8219 :
8220 : /*
8221 : * get the number of the attribute
8222 : */
8223 383 : attnum = get_attnum(RelationGetRelid(rel), colName);
8224 383 : if (attnum == InvalidAttrNumber)
8225 20 : ereport(ERROR,
8226 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8227 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8228 : colName, RelationGetRelationName(rel))));
8229 :
8230 : /* Prevent them from altering a system attribute */
8231 363 : if (attnum <= 0)
8232 0 : ereport(ERROR,
8233 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8234 : errmsg("cannot alter system column \"%s\"",
8235 : colName)));
8236 :
8237 363 : if (TupleDescAttr(tupdesc, attnum - 1)->attidentity)
8238 12 : ereport(ERROR,
8239 : (errcode(ERRCODE_SYNTAX_ERROR),
8240 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
8241 : colName, RelationGetRelationName(rel)),
8242 : /* translator: %s is an SQL ALTER command */
8243 : newDefault ? 0 : errhint("Use %s instead.",
8244 : "ALTER TABLE ... ALTER COLUMN ... DROP IDENTITY")));
8245 :
8246 351 : if (TupleDescAttr(tupdesc, attnum - 1)->attgenerated)
8247 8 : ereport(ERROR,
8248 : (errcode(ERRCODE_SYNTAX_ERROR),
8249 : errmsg("column \"%s\" of relation \"%s\" is a generated column",
8250 : colName, RelationGetRelationName(rel)),
8251 : newDefault ?
8252 : /* translator: %s is an SQL ALTER command */
8253 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... SET EXPRESSION") :
8254 : (TupleDescAttr(tupdesc, attnum - 1)->attgenerated == ATTRIBUTE_GENERATED_STORED ?
8255 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION") : 0)));
8256 :
8257 : /*
8258 : * Remove any old default for the column. We use RESTRICT here for
8259 : * safety, but at present we do not expect anything to depend on the
8260 : * default.
8261 : *
8262 : * We treat removing the existing default as an internal operation when it
8263 : * is preparatory to adding a new default, but as a user-initiated
8264 : * operation when the user asked for a drop.
8265 : */
8266 343 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8267 : newDefault != NULL);
8268 :
8269 343 : if (newDefault)
8270 : {
8271 : /* SET DEFAULT */
8272 : RawColumnDefault *rawEnt;
8273 :
8274 227 : rawEnt = palloc_object(RawColumnDefault);
8275 227 : rawEnt->attnum = attnum;
8276 227 : rawEnt->raw_default = newDefault;
8277 227 : rawEnt->generated = '\0';
8278 :
8279 : /*
8280 : * This function is intended for CREATE TABLE, so it processes a
8281 : * _list_ of defaults, but we just do one.
8282 : */
8283 227 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8284 : false, true, false, NULL);
8285 : }
8286 :
8287 339 : ObjectAddressSubSet(address, RelationRelationId,
8288 : RelationGetRelid(rel), attnum);
8289 339 : return address;
8290 : }
8291 :
8292 : /*
8293 : * Add a pre-cooked default expression.
8294 : *
8295 : * Return the address of the affected column.
8296 : */
8297 : static ObjectAddress
8298 53 : ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
8299 : Node *newDefault)
8300 : {
8301 : ObjectAddress address;
8302 :
8303 : /* We assume no checking is required */
8304 :
8305 : /*
8306 : * Remove any old default for the column. We use RESTRICT here for
8307 : * safety, but at present we do not expect anything to depend on the
8308 : * default. (In ordinary cases, there could not be a default in place
8309 : * anyway, but it's possible when combining LIKE with inheritance.)
8310 : */
8311 53 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8312 : true);
8313 :
8314 53 : (void) StoreAttrDefault(rel, attnum, newDefault, true);
8315 :
8316 53 : ObjectAddressSubSet(address, RelationRelationId,
8317 : RelationGetRelid(rel), attnum);
8318 53 : return address;
8319 : }
8320 :
8321 : /*
8322 : * ALTER TABLE ALTER COLUMN ADD IDENTITY
8323 : *
8324 : * Return the address of the affected column.
8325 : */
8326 : static ObjectAddress
8327 103 : ATExecAddIdentity(Relation rel, const char *colName,
8328 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing)
8329 : {
8330 : Relation attrelation;
8331 : HeapTuple tuple;
8332 : Form_pg_attribute attTup;
8333 : AttrNumber attnum;
8334 : ObjectAddress address;
8335 103 : ColumnDef *cdef = castNode(ColumnDef, def);
8336 : bool ispartitioned;
8337 :
8338 103 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8339 103 : if (ispartitioned && !recurse)
8340 4 : ereport(ERROR,
8341 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8342 : errmsg("cannot add identity to a column of only the partitioned table"),
8343 : errhint("Do not specify the ONLY keyword.")));
8344 :
8345 99 : if (rel->rd_rel->relispartition && !recursing)
8346 8 : ereport(ERROR,
8347 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8348 : errmsg("cannot add identity to a column of a partition"));
8349 :
8350 91 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8351 :
8352 91 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8353 91 : if (!HeapTupleIsValid(tuple))
8354 0 : ereport(ERROR,
8355 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8356 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8357 : colName, RelationGetRelationName(rel))));
8358 91 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8359 91 : attnum = attTup->attnum;
8360 :
8361 : /* Can't alter a system attribute */
8362 91 : if (attnum <= 0)
8363 0 : ereport(ERROR,
8364 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8365 : errmsg("cannot alter system column \"%s\"",
8366 : colName)));
8367 :
8368 : /*
8369 : * Creating a column as identity implies NOT NULL, so adding the identity
8370 : * to an existing column that is not NOT NULL would create a state that
8371 : * cannot be reproduced without contortions.
8372 : */
8373 91 : if (!attTup->attnotnull)
8374 4 : ereport(ERROR,
8375 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8376 : errmsg("column \"%s\" of relation \"%s\" must be declared NOT NULL before identity can be added",
8377 : colName, RelationGetRelationName(rel))));
8378 :
8379 : /*
8380 : * On the other hand, if a not-null constraint exists, then verify that
8381 : * it's compatible.
8382 : */
8383 87 : if (attTup->attnotnull)
8384 : {
8385 : HeapTuple contup;
8386 : Form_pg_constraint conForm;
8387 :
8388 87 : contup = findNotNullConstraintAttnum(RelationGetRelid(rel),
8389 : attnum);
8390 87 : if (!HeapTupleIsValid(contup))
8391 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
8392 : colName, RelationGetRelationName(rel));
8393 :
8394 87 : conForm = (Form_pg_constraint) GETSTRUCT(contup);
8395 87 : if (!conForm->convalidated)
8396 4 : ereport(ERROR,
8397 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8398 : errmsg("incompatible NOT VALID constraint \"%s\" on relation \"%s\"",
8399 : NameStr(conForm->conname), RelationGetRelationName(rel)),
8400 : errhint("You might need to validate it using %s.",
8401 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
8402 : }
8403 :
8404 83 : if (attTup->attidentity)
8405 12 : ereport(ERROR,
8406 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8407 : errmsg("column \"%s\" of relation \"%s\" is already an identity column",
8408 : colName, RelationGetRelationName(rel))));
8409 :
8410 71 : if (attTup->atthasdef)
8411 4 : ereport(ERROR,
8412 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8413 : errmsg("column \"%s\" of relation \"%s\" already has a default value",
8414 : colName, RelationGetRelationName(rel))));
8415 :
8416 67 : attTup->attidentity = cdef->identity;
8417 67 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8418 :
8419 67 : InvokeObjectPostAlterHook(RelationRelationId,
8420 : RelationGetRelid(rel),
8421 : attTup->attnum);
8422 67 : ObjectAddressSubSet(address, RelationRelationId,
8423 : RelationGetRelid(rel), attnum);
8424 67 : heap_freetuple(tuple);
8425 :
8426 67 : table_close(attrelation, RowExclusiveLock);
8427 :
8428 : /*
8429 : * Recurse to propagate the identity column to partitions. Identity is
8430 : * not inherited in regular inheritance children.
8431 : */
8432 67 : if (recurse && ispartitioned)
8433 : {
8434 : List *children;
8435 : ListCell *lc;
8436 :
8437 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8438 :
8439 10 : foreach(lc, children)
8440 : {
8441 : Relation childrel;
8442 :
8443 4 : childrel = table_open(lfirst_oid(lc), NoLock);
8444 4 : ATExecAddIdentity(childrel, colName, def, lockmode, recurse, true);
8445 4 : table_close(childrel, NoLock);
8446 : }
8447 : }
8448 :
8449 67 : return address;
8450 : }
8451 :
8452 : /*
8453 : * ALTER TABLE ALTER COLUMN SET { GENERATED or sequence options }
8454 : *
8455 : * Return the address of the affected column.
8456 : */
8457 : static ObjectAddress
8458 49 : ATExecSetIdentity(Relation rel, const char *colName, Node *def,
8459 : LOCKMODE lockmode, bool recurse, bool recursing)
8460 : {
8461 : ListCell *option;
8462 49 : DefElem *generatedEl = NULL;
8463 : HeapTuple tuple;
8464 : Form_pg_attribute attTup;
8465 : AttrNumber attnum;
8466 : Relation attrelation;
8467 : ObjectAddress address;
8468 : bool ispartitioned;
8469 :
8470 49 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8471 49 : if (ispartitioned && !recurse)
8472 4 : ereport(ERROR,
8473 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8474 : errmsg("cannot change identity column of only the partitioned table"),
8475 : errhint("Do not specify the ONLY keyword.")));
8476 :
8477 45 : if (rel->rd_rel->relispartition && !recursing)
8478 8 : ereport(ERROR,
8479 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8480 : errmsg("cannot change identity column of a partition"));
8481 :
8482 66 : foreach(option, castNode(List, def))
8483 : {
8484 29 : DefElem *defel = lfirst_node(DefElem, option);
8485 :
8486 29 : if (strcmp(defel->defname, "generated") == 0)
8487 : {
8488 29 : if (generatedEl)
8489 0 : ereport(ERROR,
8490 : (errcode(ERRCODE_SYNTAX_ERROR),
8491 : errmsg("conflicting or redundant options")));
8492 29 : generatedEl = defel;
8493 : }
8494 : else
8495 0 : elog(ERROR, "option \"%s\" not recognized",
8496 : defel->defname);
8497 : }
8498 :
8499 : /*
8500 : * Even if there is nothing to change here, we run all the checks. There
8501 : * will be a subsequent ALTER SEQUENCE that relies on everything being
8502 : * there.
8503 : */
8504 :
8505 37 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8506 37 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8507 37 : if (!HeapTupleIsValid(tuple))
8508 0 : ereport(ERROR,
8509 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8510 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8511 : colName, RelationGetRelationName(rel))));
8512 :
8513 37 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8514 37 : attnum = attTup->attnum;
8515 :
8516 37 : if (attnum <= 0)
8517 0 : ereport(ERROR,
8518 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8519 : errmsg("cannot alter system column \"%s\"",
8520 : colName)));
8521 :
8522 37 : if (!attTup->attidentity)
8523 4 : ereport(ERROR,
8524 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8525 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8526 : colName, RelationGetRelationName(rel))));
8527 :
8528 33 : if (generatedEl)
8529 : {
8530 29 : attTup->attidentity = defGetInt32(generatedEl);
8531 29 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8532 :
8533 29 : InvokeObjectPostAlterHook(RelationRelationId,
8534 : RelationGetRelid(rel),
8535 : attTup->attnum);
8536 29 : ObjectAddressSubSet(address, RelationRelationId,
8537 : RelationGetRelid(rel), attnum);
8538 : }
8539 : else
8540 4 : address = InvalidObjectAddress;
8541 :
8542 33 : heap_freetuple(tuple);
8543 33 : table_close(attrelation, RowExclusiveLock);
8544 :
8545 : /*
8546 : * Recurse to propagate the identity change to partitions. Identity is not
8547 : * inherited in regular inheritance children.
8548 : */
8549 33 : if (generatedEl && recurse && ispartitioned)
8550 : {
8551 : List *children;
8552 : ListCell *lc;
8553 :
8554 4 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8555 :
8556 12 : foreach(lc, children)
8557 : {
8558 : Relation childrel;
8559 :
8560 8 : childrel = table_open(lfirst_oid(lc), NoLock);
8561 8 : ATExecSetIdentity(childrel, colName, def, lockmode, recurse, true);
8562 8 : table_close(childrel, NoLock);
8563 : }
8564 : }
8565 :
8566 33 : return address;
8567 : }
8568 :
8569 : /*
8570 : * ALTER TABLE ALTER COLUMN DROP IDENTITY
8571 : *
8572 : * Return the address of the affected column.
8573 : */
8574 : static ObjectAddress
8575 61 : ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
8576 : bool recurse, bool recursing)
8577 : {
8578 : HeapTuple tuple;
8579 : Form_pg_attribute attTup;
8580 : AttrNumber attnum;
8581 : Relation attrelation;
8582 : ObjectAddress address;
8583 : Oid seqid;
8584 : ObjectAddress seqaddress;
8585 : bool ispartitioned;
8586 :
8587 61 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8588 61 : if (ispartitioned && !recurse)
8589 4 : ereport(ERROR,
8590 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8591 : errmsg("cannot drop identity from a column of only the partitioned table"),
8592 : errhint("Do not specify the ONLY keyword.")));
8593 :
8594 57 : if (rel->rd_rel->relispartition && !recursing)
8595 4 : ereport(ERROR,
8596 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8597 : errmsg("cannot drop identity from a column of a partition"));
8598 :
8599 53 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8600 53 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8601 53 : if (!HeapTupleIsValid(tuple))
8602 0 : ereport(ERROR,
8603 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8604 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8605 : colName, RelationGetRelationName(rel))));
8606 :
8607 53 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8608 53 : attnum = attTup->attnum;
8609 :
8610 53 : if (attnum <= 0)
8611 0 : ereport(ERROR,
8612 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8613 : errmsg("cannot alter system column \"%s\"",
8614 : colName)));
8615 :
8616 53 : if (!attTup->attidentity)
8617 : {
8618 8 : if (!missing_ok)
8619 4 : ereport(ERROR,
8620 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8621 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8622 : colName, RelationGetRelationName(rel))));
8623 : else
8624 : {
8625 4 : ereport(NOTICE,
8626 : (errmsg("column \"%s\" of relation \"%s\" is not an identity column, skipping",
8627 : colName, RelationGetRelationName(rel))));
8628 4 : heap_freetuple(tuple);
8629 4 : table_close(attrelation, RowExclusiveLock);
8630 4 : return InvalidObjectAddress;
8631 : }
8632 : }
8633 :
8634 45 : attTup->attidentity = '\0';
8635 45 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8636 :
8637 45 : InvokeObjectPostAlterHook(RelationRelationId,
8638 : RelationGetRelid(rel),
8639 : attTup->attnum);
8640 45 : ObjectAddressSubSet(address, RelationRelationId,
8641 : RelationGetRelid(rel), attnum);
8642 45 : heap_freetuple(tuple);
8643 :
8644 45 : table_close(attrelation, RowExclusiveLock);
8645 :
8646 : /*
8647 : * Recurse to drop the identity from column in partitions. Identity is
8648 : * not inherited in regular inheritance children so ignore them.
8649 : */
8650 45 : if (recurse && ispartitioned)
8651 : {
8652 : List *children;
8653 : ListCell *lc;
8654 :
8655 4 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8656 :
8657 8 : foreach(lc, children)
8658 : {
8659 : Relation childrel;
8660 :
8661 4 : childrel = table_open(lfirst_oid(lc), NoLock);
8662 4 : ATExecDropIdentity(childrel, colName, false, lockmode, recurse, true);
8663 4 : table_close(childrel, NoLock);
8664 : }
8665 : }
8666 :
8667 45 : if (!recursing)
8668 : {
8669 : /* drop the internal sequence */
8670 21 : seqid = getIdentitySequence(rel, attnum, false);
8671 21 : deleteDependencyRecordsForClass(RelationRelationId, seqid,
8672 : RelationRelationId, DEPENDENCY_INTERNAL);
8673 21 : CommandCounterIncrement();
8674 21 : seqaddress.classId = RelationRelationId;
8675 21 : seqaddress.objectId = seqid;
8676 21 : seqaddress.objectSubId = 0;
8677 21 : performDeletion(&seqaddress, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
8678 : }
8679 :
8680 45 : return address;
8681 : }
8682 :
8683 : /*
8684 : * ALTER TABLE ALTER COLUMN SET EXPRESSION
8685 : *
8686 : * Return the address of the affected column.
8687 : */
8688 : static ObjectAddress
8689 153 : ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
8690 : Node *newExpr, LOCKMODE lockmode)
8691 : {
8692 : HeapTuple tuple;
8693 : Form_pg_attribute attTup;
8694 : AttrNumber attnum;
8695 : char attgenerated;
8696 : bool rewrite;
8697 : Oid attrdefoid;
8698 : ObjectAddress address;
8699 : Expr *defval;
8700 : NewColumnValue *newval;
8701 : RawColumnDefault *rawEnt;
8702 :
8703 153 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8704 153 : if (!HeapTupleIsValid(tuple))
8705 0 : ereport(ERROR,
8706 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8707 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8708 : colName, RelationGetRelationName(rel))));
8709 :
8710 153 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8711 :
8712 153 : attnum = attTup->attnum;
8713 153 : if (attnum <= 0)
8714 0 : ereport(ERROR,
8715 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8716 : errmsg("cannot alter system column \"%s\"",
8717 : colName)));
8718 :
8719 153 : attgenerated = attTup->attgenerated;
8720 153 : if (!attgenerated)
8721 8 : ereport(ERROR,
8722 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8723 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8724 : colName, RelationGetRelationName(rel))));
8725 :
8726 145 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL && attTup->attnotnull)
8727 16 : tab->verify_new_notnull = true;
8728 :
8729 : /*
8730 : * We need to prevent this because a change of expression could affect a
8731 : * row filter and inject expressions that are not permitted in a row
8732 : * filter. XXX We could try to have a more precise check to catch only
8733 : * publications with row filters, or even re-verify the row filter
8734 : * expressions.
8735 : */
8736 221 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8737 76 : GetRelationIncludedPublications(RelationGetRelid(rel)) != NIL)
8738 4 : ereport(ERROR,
8739 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8740 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns in tables that are part of a publication"),
8741 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8742 : colName, RelationGetRelationName(rel))));
8743 :
8744 141 : rewrite = (attgenerated == ATTRIBUTE_GENERATED_STORED);
8745 :
8746 141 : ReleaseSysCache(tuple);
8747 :
8748 141 : if (rewrite)
8749 : {
8750 : /*
8751 : * Clear all the missing values if we're rewriting the table, since
8752 : * this renders them pointless.
8753 : */
8754 69 : RelationClearMissing(rel);
8755 :
8756 : /* make sure we don't conflict with later attribute modifications */
8757 69 : CommandCounterIncrement();
8758 : }
8759 :
8760 : /*
8761 : * Find everything that depends on the column (constraints, indexes, etc),
8762 : * and record enough information to let us recreate the objects.
8763 : */
8764 141 : RememberAllDependentForRebuilding(tab, AT_SetExpression, rel, attnum, colName);
8765 :
8766 : /*
8767 : * Drop the dependency records of the GENERATED expression, in particular
8768 : * its INTERNAL dependency on the column, which would otherwise cause
8769 : * dependency.c to refuse to perform the deletion.
8770 : */
8771 141 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8772 141 : if (!OidIsValid(attrdefoid))
8773 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8774 : RelationGetRelid(rel), attnum);
8775 141 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8776 :
8777 : /* Make above changes visible */
8778 141 : CommandCounterIncrement();
8779 :
8780 : /*
8781 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8782 : * safety, but at present we do not expect anything to depend on the
8783 : * expression.
8784 : */
8785 141 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8786 : false, false);
8787 :
8788 : /* Prepare to store the new expression, in the catalogs */
8789 141 : rawEnt = palloc_object(RawColumnDefault);
8790 141 : rawEnt->attnum = attnum;
8791 141 : rawEnt->raw_default = newExpr;
8792 141 : rawEnt->generated = attgenerated;
8793 :
8794 : /* Store the generated expression */
8795 141 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8796 : false, true, false, NULL);
8797 :
8798 : /* Make above new expression visible */
8799 141 : CommandCounterIncrement();
8800 :
8801 141 : if (rewrite)
8802 : {
8803 : /* Prepare for table rewrite */
8804 69 : defval = (Expr *) build_column_default(rel, attnum);
8805 :
8806 69 : newval = palloc0_object(NewColumnValue);
8807 69 : newval->attnum = attnum;
8808 69 : newval->expr = expression_planner(defval);
8809 69 : newval->is_generated = true;
8810 :
8811 69 : tab->newvals = lappend(tab->newvals, newval);
8812 69 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
8813 : }
8814 :
8815 : /* Drop any pg_statistic entry for the column */
8816 141 : RemoveStatistics(RelationGetRelid(rel), attnum);
8817 :
8818 141 : InvokeObjectPostAlterHook(RelationRelationId,
8819 : RelationGetRelid(rel), attnum);
8820 :
8821 141 : ObjectAddressSubSet(address, RelationRelationId,
8822 : RelationGetRelid(rel), attnum);
8823 141 : return address;
8824 : }
8825 :
8826 : /*
8827 : * ALTER TABLE ALTER COLUMN DROP EXPRESSION
8828 : */
8829 : static void
8830 57 : ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode)
8831 : {
8832 : /*
8833 : * Reject ONLY if there are child tables. We could implement this, but it
8834 : * is a bit complicated. GENERATED clauses must be attached to the column
8835 : * definition and cannot be added later like DEFAULT, so if a child table
8836 : * has a generation expression that the parent does not have, the child
8837 : * column will necessarily be an attislocal column. So to implement ONLY
8838 : * here, we'd need extra code to update attislocal of the direct child
8839 : * tables, somewhat similar to how DROP COLUMN does it, so that the
8840 : * resulting state can be properly dumped and restored.
8841 : */
8842 73 : if (!recurse &&
8843 16 : find_inheritance_children(RelationGetRelid(rel), lockmode))
8844 8 : ereport(ERROR,
8845 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8846 : errmsg("ALTER TABLE / DROP EXPRESSION must be applied to child tables too")));
8847 :
8848 : /*
8849 : * Cannot drop generation expression from inherited columns.
8850 : */
8851 49 : if (!recursing)
8852 : {
8853 : HeapTuple tuple;
8854 : Form_pg_attribute attTup;
8855 :
8856 41 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), cmd->name);
8857 41 : if (!HeapTupleIsValid(tuple))
8858 0 : ereport(ERROR,
8859 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8860 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8861 : cmd->name, RelationGetRelationName(rel))));
8862 :
8863 41 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8864 :
8865 41 : if (attTup->attinhcount > 0)
8866 8 : ereport(ERROR,
8867 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8868 : errmsg("cannot drop generation expression from inherited column")));
8869 : }
8870 41 : }
8871 :
8872 : /*
8873 : * Return the address of the affected column.
8874 : */
8875 : static ObjectAddress
8876 37 : ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode)
8877 : {
8878 : HeapTuple tuple;
8879 : Form_pg_attribute attTup;
8880 : AttrNumber attnum;
8881 : Relation attrelation;
8882 : Oid attrdefoid;
8883 : ObjectAddress address;
8884 :
8885 37 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8886 37 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8887 37 : if (!HeapTupleIsValid(tuple))
8888 0 : ereport(ERROR,
8889 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8890 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8891 : colName, RelationGetRelationName(rel))));
8892 :
8893 37 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8894 37 : attnum = attTup->attnum;
8895 :
8896 37 : if (attnum <= 0)
8897 0 : ereport(ERROR,
8898 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8899 : errmsg("cannot alter system column \"%s\"",
8900 : colName)));
8901 :
8902 : /*
8903 : * TODO: This could be done, but it would need a table rewrite to
8904 : * materialize the generated values. Note that for the time being, we
8905 : * still error with missing_ok, so that we don't silently leave the column
8906 : * as generated.
8907 : */
8908 37 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8909 8 : ereport(ERROR,
8910 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8911 : errmsg("ALTER TABLE / DROP EXPRESSION is not supported for virtual generated columns"),
8912 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8913 : colName, RelationGetRelationName(rel))));
8914 :
8915 29 : if (!attTup->attgenerated)
8916 : {
8917 16 : if (!missing_ok)
8918 8 : ereport(ERROR,
8919 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8920 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8921 : colName, RelationGetRelationName(rel))));
8922 : else
8923 : {
8924 8 : ereport(NOTICE,
8925 : (errmsg("column \"%s\" of relation \"%s\" is not a generated column, skipping",
8926 : colName, RelationGetRelationName(rel))));
8927 8 : heap_freetuple(tuple);
8928 8 : table_close(attrelation, RowExclusiveLock);
8929 8 : return InvalidObjectAddress;
8930 : }
8931 : }
8932 :
8933 : /*
8934 : * Mark the column as no longer generated. (The atthasdef flag needs to
8935 : * get cleared too, but RemoveAttrDefault will handle that.)
8936 : */
8937 13 : attTup->attgenerated = '\0';
8938 13 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8939 :
8940 13 : InvokeObjectPostAlterHook(RelationRelationId,
8941 : RelationGetRelid(rel),
8942 : attnum);
8943 13 : heap_freetuple(tuple);
8944 :
8945 13 : table_close(attrelation, RowExclusiveLock);
8946 :
8947 : /*
8948 : * Drop the dependency records of the GENERATED expression, in particular
8949 : * its INTERNAL dependency on the column, which would otherwise cause
8950 : * dependency.c to refuse to perform the deletion.
8951 : */
8952 13 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8953 13 : if (!OidIsValid(attrdefoid))
8954 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8955 : RelationGetRelid(rel), attnum);
8956 13 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8957 :
8958 : /* Make above changes visible */
8959 13 : CommandCounterIncrement();
8960 :
8961 : /*
8962 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8963 : * safety, but at present we do not expect anything to depend on the
8964 : * default.
8965 : */
8966 13 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8967 : false, false);
8968 :
8969 13 : ObjectAddressSubSet(address, RelationRelationId,
8970 : RelationGetRelid(rel), attnum);
8971 13 : return address;
8972 : }
8973 :
8974 : /*
8975 : * ALTER TABLE ALTER COLUMN SET STATISTICS
8976 : *
8977 : * Return value is the address of the modified column
8978 : */
8979 : static ObjectAddress
8980 107 : ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
8981 : {
8982 107 : int newtarget = 0;
8983 : bool newtarget_default;
8984 : Relation attrelation;
8985 : HeapTuple tuple,
8986 : newtuple;
8987 : Form_pg_attribute attrtuple;
8988 : AttrNumber attnum;
8989 : ObjectAddress address;
8990 : Datum repl_val[Natts_pg_attribute];
8991 : bool repl_null[Natts_pg_attribute];
8992 : bool repl_repl[Natts_pg_attribute];
8993 :
8994 : /*
8995 : * We allow referencing columns by numbers only for indexes, since table
8996 : * column numbers could contain gaps if columns are later dropped.
8997 : */
8998 107 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
8999 65 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
9000 : !colName)
9001 0 : ereport(ERROR,
9002 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9003 : errmsg("cannot refer to non-index column by number")));
9004 :
9005 : /* -1 was used in previous versions for the default setting */
9006 107 : if (newValue && intVal(newValue) != -1)
9007 : {
9008 78 : newtarget = intVal(newValue);
9009 78 : newtarget_default = false;
9010 : }
9011 : else
9012 29 : newtarget_default = true;
9013 :
9014 107 : if (!newtarget_default)
9015 : {
9016 : /*
9017 : * Limit target to a sane range
9018 : */
9019 78 : if (newtarget < 0)
9020 : {
9021 0 : ereport(ERROR,
9022 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
9023 : errmsg("statistics target %d is too low",
9024 : newtarget)));
9025 : }
9026 78 : else if (newtarget > MAX_STATISTICS_TARGET)
9027 : {
9028 0 : newtarget = MAX_STATISTICS_TARGET;
9029 0 : ereport(WARNING,
9030 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
9031 : errmsg("lowering statistics target to %d",
9032 : newtarget)));
9033 : }
9034 : }
9035 :
9036 107 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9037 :
9038 107 : if (colName)
9039 : {
9040 65 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9041 :
9042 65 : if (!HeapTupleIsValid(tuple))
9043 8 : ereport(ERROR,
9044 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9045 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9046 : colName, RelationGetRelationName(rel))));
9047 : }
9048 : else
9049 : {
9050 42 : tuple = SearchSysCacheAttNum(RelationGetRelid(rel), colNum);
9051 :
9052 42 : if (!HeapTupleIsValid(tuple))
9053 8 : ereport(ERROR,
9054 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9055 : errmsg("column number %d of relation \"%s\" does not exist",
9056 : colNum, RelationGetRelationName(rel))));
9057 : }
9058 :
9059 91 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9060 :
9061 91 : attnum = attrtuple->attnum;
9062 91 : if (attnum <= 0)
9063 0 : ereport(ERROR,
9064 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9065 : errmsg("cannot alter system column \"%s\"",
9066 : colName)));
9067 :
9068 : /*
9069 : * Prevent this as long as the ANALYZE code skips virtual generated
9070 : * columns.
9071 : */
9072 91 : if (attrtuple->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
9073 0 : ereport(ERROR,
9074 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9075 : errmsg("cannot alter statistics on virtual generated column \"%s\"",
9076 : colName)));
9077 :
9078 91 : if (rel->rd_rel->relkind == RELKIND_INDEX ||
9079 57 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
9080 : {
9081 34 : if (attnum > rel->rd_index->indnkeyatts)
9082 4 : ereport(ERROR,
9083 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9084 : errmsg("cannot alter statistics on included column \"%s\" of index \"%s\"",
9085 : NameStr(attrtuple->attname), RelationGetRelationName(rel))));
9086 30 : else if (rel->rd_index->indkey.values[attnum - 1] != 0)
9087 12 : ereport(ERROR,
9088 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9089 : errmsg("cannot alter statistics on non-expression column \"%s\" of index \"%s\"",
9090 : NameStr(attrtuple->attname), RelationGetRelationName(rel)),
9091 : errhint("Alter statistics on table column instead.")));
9092 : }
9093 :
9094 : /* Build new tuple. */
9095 75 : memset(repl_null, false, sizeof(repl_null));
9096 75 : memset(repl_repl, false, sizeof(repl_repl));
9097 75 : if (!newtarget_default)
9098 46 : repl_val[Anum_pg_attribute_attstattarget - 1] = Int16GetDatum(newtarget);
9099 : else
9100 29 : repl_null[Anum_pg_attribute_attstattarget - 1] = true;
9101 75 : repl_repl[Anum_pg_attribute_attstattarget - 1] = true;
9102 75 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9103 : repl_val, repl_null, repl_repl);
9104 75 : CatalogTupleUpdate(attrelation, &tuple->t_self, newtuple);
9105 :
9106 75 : InvokeObjectPostAlterHook(RelationRelationId,
9107 : RelationGetRelid(rel),
9108 : attrtuple->attnum);
9109 75 : ObjectAddressSubSet(address, RelationRelationId,
9110 : RelationGetRelid(rel), attnum);
9111 :
9112 75 : heap_freetuple(newtuple);
9113 :
9114 75 : ReleaseSysCache(tuple);
9115 :
9116 75 : table_close(attrelation, RowExclusiveLock);
9117 :
9118 75 : return address;
9119 : }
9120 :
9121 : /*
9122 : * Return value is the address of the modified column
9123 : */
9124 : static ObjectAddress
9125 21 : ATExecSetOptions(Relation rel, const char *colName, Node *options,
9126 : bool isReset, LOCKMODE lockmode)
9127 : {
9128 : Relation attrelation;
9129 : HeapTuple tuple,
9130 : newtuple;
9131 : Form_pg_attribute attrtuple;
9132 : AttrNumber attnum;
9133 : Datum datum,
9134 : newOptions;
9135 : bool isnull;
9136 : ObjectAddress address;
9137 : Datum repl_val[Natts_pg_attribute];
9138 : bool repl_null[Natts_pg_attribute];
9139 : bool repl_repl[Natts_pg_attribute];
9140 :
9141 21 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9142 :
9143 21 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9144 :
9145 21 : if (!HeapTupleIsValid(tuple))
9146 0 : ereport(ERROR,
9147 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9148 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9149 : colName, RelationGetRelationName(rel))));
9150 21 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9151 :
9152 21 : attnum = attrtuple->attnum;
9153 21 : if (attnum <= 0)
9154 0 : ereport(ERROR,
9155 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9156 : errmsg("cannot alter system column \"%s\"",
9157 : colName)));
9158 :
9159 : /* Generate new proposed attoptions (text array) */
9160 21 : datum = SysCacheGetAttr(ATTNAME, tuple, Anum_pg_attribute_attoptions,
9161 : &isnull);
9162 21 : newOptions = transformRelOptions(isnull ? (Datum) 0 : datum,
9163 : castNode(List, options), NULL, NULL,
9164 : false, isReset);
9165 : /* Validate new options */
9166 21 : (void) attribute_reloptions(newOptions, true);
9167 :
9168 : /* Build new tuple. */
9169 21 : memset(repl_null, false, sizeof(repl_null));
9170 21 : memset(repl_repl, false, sizeof(repl_repl));
9171 21 : if (newOptions != (Datum) 0)
9172 21 : repl_val[Anum_pg_attribute_attoptions - 1] = newOptions;
9173 : else
9174 0 : repl_null[Anum_pg_attribute_attoptions - 1] = true;
9175 21 : repl_repl[Anum_pg_attribute_attoptions - 1] = true;
9176 21 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9177 : repl_val, repl_null, repl_repl);
9178 :
9179 : /* Update system catalog. */
9180 21 : CatalogTupleUpdate(attrelation, &newtuple->t_self, newtuple);
9181 :
9182 21 : InvokeObjectPostAlterHook(RelationRelationId,
9183 : RelationGetRelid(rel),
9184 : attrtuple->attnum);
9185 21 : ObjectAddressSubSet(address, RelationRelationId,
9186 : RelationGetRelid(rel), attnum);
9187 :
9188 21 : heap_freetuple(newtuple);
9189 :
9190 21 : ReleaseSysCache(tuple);
9191 :
9192 21 : table_close(attrelation, RowExclusiveLock);
9193 :
9194 21 : return address;
9195 : }
9196 :
9197 : /*
9198 : * Helper function for ATExecSetStorage and ATExecSetCompression
9199 : *
9200 : * Set the attstorage and/or attcompression fields for index columns
9201 : * associated with the specified table column.
9202 : */
9203 : static void
9204 208 : SetIndexStorageProperties(Relation rel, Relation attrelation,
9205 : AttrNumber attnum,
9206 : bool setstorage, char newstorage,
9207 : bool setcompression, char newcompression,
9208 : LOCKMODE lockmode)
9209 : {
9210 : ListCell *lc;
9211 :
9212 265 : foreach(lc, RelationGetIndexList(rel))
9213 : {
9214 57 : Oid indexoid = lfirst_oid(lc);
9215 : Relation indrel;
9216 57 : AttrNumber indattnum = 0;
9217 : HeapTuple tuple;
9218 :
9219 57 : indrel = index_open(indexoid, lockmode);
9220 :
9221 95 : for (int i = 0; i < indrel->rd_index->indnatts; i++)
9222 : {
9223 61 : if (indrel->rd_index->indkey.values[i] == attnum)
9224 : {
9225 23 : indattnum = i + 1;
9226 23 : break;
9227 : }
9228 : }
9229 :
9230 57 : if (indattnum == 0)
9231 : {
9232 34 : index_close(indrel, lockmode);
9233 34 : continue;
9234 : }
9235 :
9236 23 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(indrel), indattnum);
9237 :
9238 23 : if (HeapTupleIsValid(tuple))
9239 : {
9240 23 : Form_pg_attribute attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9241 :
9242 23 : if (setstorage)
9243 15 : attrtuple->attstorage = newstorage;
9244 :
9245 23 : if (setcompression)
9246 8 : attrtuple->attcompression = newcompression;
9247 :
9248 23 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9249 :
9250 23 : InvokeObjectPostAlterHook(RelationRelationId,
9251 : RelationGetRelid(rel),
9252 : attrtuple->attnum);
9253 :
9254 23 : heap_freetuple(tuple);
9255 : }
9256 :
9257 23 : index_close(indrel, lockmode);
9258 : }
9259 208 : }
9260 :
9261 : /*
9262 : * ALTER TABLE ALTER COLUMN SET STORAGE
9263 : *
9264 : * Return value is the address of the modified column
9265 : */
9266 : static ObjectAddress
9267 173 : ATExecSetStorage(Relation rel, const char *colName, Node *newValue, LOCKMODE lockmode)
9268 : {
9269 : Relation attrelation;
9270 : HeapTuple tuple;
9271 : Form_pg_attribute attrtuple;
9272 : AttrNumber attnum;
9273 : ObjectAddress address;
9274 :
9275 173 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9276 :
9277 173 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
9278 :
9279 173 : if (!HeapTupleIsValid(tuple))
9280 8 : ereport(ERROR,
9281 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9282 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9283 : colName, RelationGetRelationName(rel))));
9284 165 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9285 :
9286 165 : attnum = attrtuple->attnum;
9287 165 : if (attnum <= 0)
9288 0 : ereport(ERROR,
9289 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9290 : errmsg("cannot alter system column \"%s\"",
9291 : colName)));
9292 :
9293 165 : attrtuple->attstorage = GetAttributeStorage(attrtuple->atttypid, strVal(newValue));
9294 :
9295 165 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9296 :
9297 165 : InvokeObjectPostAlterHook(RelationRelationId,
9298 : RelationGetRelid(rel),
9299 : attrtuple->attnum);
9300 :
9301 : /*
9302 : * Apply the change to indexes as well (only for simple index columns,
9303 : * matching behavior of index.c ConstructTupleDescriptor()).
9304 : */
9305 165 : SetIndexStorageProperties(rel, attrelation, attnum,
9306 165 : true, attrtuple->attstorage,
9307 : false, 0,
9308 : lockmode);
9309 :
9310 165 : heap_freetuple(tuple);
9311 :
9312 165 : table_close(attrelation, RowExclusiveLock);
9313 :
9314 165 : ObjectAddressSubSet(address, RelationRelationId,
9315 : RelationGetRelid(rel), attnum);
9316 165 : return address;
9317 : }
9318 :
9319 :
9320 : /*
9321 : * ALTER TABLE DROP COLUMN
9322 : *
9323 : * DROP COLUMN cannot use the normal ALTER TABLE recursion mechanism,
9324 : * because we have to decide at runtime whether to recurse or not depending
9325 : * on whether attinhcount goes to zero or not. (We can't check this in a
9326 : * static pre-pass because it won't handle multiple inheritance situations
9327 : * correctly.)
9328 : */
9329 : static void
9330 1113 : ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
9331 : AlterTableCmd *cmd, LOCKMODE lockmode,
9332 : AlterTableUtilityContext *context)
9333 : {
9334 1113 : if (rel->rd_rel->reloftype && !recursing)
9335 4 : ereport(ERROR,
9336 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
9337 : errmsg("cannot drop column from typed table")));
9338 :
9339 1109 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
9340 54 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
9341 :
9342 1105 : if (recurse)
9343 947 : cmd->recurse = true;
9344 1105 : }
9345 :
9346 : /*
9347 : * Drops column 'colName' from relation 'rel' and returns the address of the
9348 : * dropped column. The column is also dropped (or marked as no longer
9349 : * inherited from relation) from the relation's inheritance children, if any.
9350 : *
9351 : * In the recursive invocations for inheritance child relations, instead of
9352 : * dropping the column directly (if to be dropped at all), its object address
9353 : * is added to 'addrs', which must be non-NULL in such invocations. All
9354 : * columns are dropped at the same time after all the children have been
9355 : * checked recursively.
9356 : */
9357 : static ObjectAddress
9358 1478 : ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
9359 : DropBehavior behavior,
9360 : bool recurse, bool recursing,
9361 : bool missing_ok, LOCKMODE lockmode,
9362 : ObjectAddresses *addrs)
9363 : {
9364 : HeapTuple tuple;
9365 : Form_pg_attribute targetatt;
9366 : AttrNumber attnum;
9367 : List *children;
9368 : ObjectAddress object;
9369 : bool is_expr;
9370 :
9371 : /* At top level, permission check was done in ATPrepCmd, else do it */
9372 1478 : if (recursing)
9373 373 : ATSimplePermissions(AT_DropColumn, rel,
9374 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9375 :
9376 : /* Initialize addrs on the first invocation */
9377 : Assert(!recursing || addrs != NULL);
9378 :
9379 : /* since this function recurses, it could be driven to stack overflow */
9380 1478 : check_stack_depth();
9381 :
9382 1478 : if (!recursing)
9383 1105 : addrs = new_object_addresses();
9384 :
9385 : /*
9386 : * get the number of the attribute
9387 : */
9388 1478 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9389 1478 : if (!HeapTupleIsValid(tuple))
9390 : {
9391 40 : if (!missing_ok)
9392 : {
9393 24 : ereport(ERROR,
9394 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9395 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9396 : colName, RelationGetRelationName(rel))));
9397 : }
9398 : else
9399 : {
9400 16 : ereport(NOTICE,
9401 : (errmsg("column \"%s\" of relation \"%s\" does not exist, skipping",
9402 : colName, RelationGetRelationName(rel))));
9403 16 : return InvalidObjectAddress;
9404 : }
9405 : }
9406 1438 : targetatt = (Form_pg_attribute) GETSTRUCT(tuple);
9407 :
9408 1438 : attnum = targetatt->attnum;
9409 :
9410 : /* Can't drop a system attribute */
9411 1438 : if (attnum <= 0)
9412 4 : ereport(ERROR,
9413 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9414 : errmsg("cannot drop system column \"%s\"",
9415 : colName)));
9416 :
9417 : /*
9418 : * Don't drop inherited columns, unless recursing (presumably from a drop
9419 : * of the parent column)
9420 : */
9421 1434 : if (targetatt->attinhcount > 0 && !recursing)
9422 32 : ereport(ERROR,
9423 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9424 : errmsg("cannot drop inherited column \"%s\"",
9425 : colName)));
9426 :
9427 : /*
9428 : * Don't drop columns used in the partition key, either. (If we let this
9429 : * go through, the key column's dependencies would cause a cascaded drop
9430 : * of the whole table, which is surely not what the user expected.)
9431 : */
9432 1402 : if (has_partition_attrs(rel,
9433 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
9434 : &is_expr))
9435 20 : ereport(ERROR,
9436 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9437 : errmsg("cannot drop column \"%s\" because it is part of the partition key of relation \"%s\"",
9438 : colName, RelationGetRelationName(rel))));
9439 :
9440 1382 : ReleaseSysCache(tuple);
9441 :
9442 : /*
9443 : * Propagate to children as appropriate. Unlike most other ALTER
9444 : * routines, we have to do this one level of recursion at a time; we can't
9445 : * use find_all_inheritors to do it in one pass.
9446 : */
9447 : children =
9448 1382 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9449 :
9450 1382 : if (children)
9451 : {
9452 : Relation attr_rel;
9453 : ListCell *child;
9454 :
9455 : /*
9456 : * In case of a partitioned table, the column must be dropped from the
9457 : * partitions as well.
9458 : */
9459 204 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
9460 4 : ereport(ERROR,
9461 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9462 : errmsg("cannot drop column from only the partitioned table when partitions exist"),
9463 : errhint("Do not specify the ONLY keyword.")));
9464 :
9465 200 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
9466 593 : foreach(child, children)
9467 : {
9468 397 : Oid childrelid = lfirst_oid(child);
9469 : Relation childrel;
9470 : Form_pg_attribute childatt;
9471 :
9472 : /* find_inheritance_children already got lock */
9473 397 : childrel = table_open(childrelid, NoLock);
9474 397 : CheckAlterTableIsSafe(childrel);
9475 :
9476 397 : tuple = SearchSysCacheCopyAttName(childrelid, colName);
9477 397 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
9478 0 : elog(ERROR, "cache lookup failed for attribute \"%s\" of relation %u",
9479 : colName, childrelid);
9480 397 : childatt = (Form_pg_attribute) GETSTRUCT(tuple);
9481 :
9482 397 : if (childatt->attinhcount <= 0) /* shouldn't happen */
9483 0 : elog(ERROR, "relation %u has non-inherited attribute \"%s\"",
9484 : childrelid, colName);
9485 :
9486 397 : if (recurse)
9487 : {
9488 : /*
9489 : * If the child column has other definition sources, just
9490 : * decrement its inheritance count; if not, recurse to delete
9491 : * it.
9492 : */
9493 381 : if (childatt->attinhcount == 1 && !childatt->attislocal)
9494 : {
9495 : /* Time to delete this child column, too */
9496 373 : ATExecDropColumn(wqueue, childrel, colName,
9497 : behavior, true, true,
9498 : false, lockmode, addrs);
9499 : }
9500 : else
9501 : {
9502 : /* Child column must survive my deletion */
9503 8 : childatt->attinhcount--;
9504 :
9505 8 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9506 :
9507 : /* Make update visible */
9508 8 : CommandCounterIncrement();
9509 : }
9510 : }
9511 : else
9512 : {
9513 : /*
9514 : * If we were told to drop ONLY in this table (no recursion),
9515 : * we need to mark the inheritors' attributes as locally
9516 : * defined rather than inherited.
9517 : */
9518 16 : childatt->attinhcount--;
9519 16 : childatt->attislocal = true;
9520 :
9521 16 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9522 :
9523 : /* Make update visible */
9524 16 : CommandCounterIncrement();
9525 : }
9526 :
9527 393 : heap_freetuple(tuple);
9528 :
9529 393 : table_close(childrel, NoLock);
9530 : }
9531 196 : table_close(attr_rel, RowExclusiveLock);
9532 : }
9533 :
9534 : /* Add object to delete */
9535 1374 : object.classId = RelationRelationId;
9536 1374 : object.objectId = RelationGetRelid(rel);
9537 1374 : object.objectSubId = attnum;
9538 1374 : add_exact_object_address(&object, addrs);
9539 :
9540 1374 : if (!recursing)
9541 : {
9542 : /* Recursion has ended, drop everything that was collected */
9543 1005 : performMultipleDeletions(addrs, behavior, 0);
9544 961 : free_object_addresses(addrs);
9545 : }
9546 :
9547 1330 : return object;
9548 : }
9549 :
9550 : /*
9551 : * Prepare to add a primary key on a table, by adding not-null constraints
9552 : * on all columns.
9553 : *
9554 : * The not-null constraints for a primary key must cover the whole inheritance
9555 : * hierarchy (failing to ensure that leads to funny corner cases). For the
9556 : * normal case where we're asked to recurse, this routine checks if the
9557 : * not-null constraints exist already, and if not queues a requirement for
9558 : * them to be created by phase 2.
9559 : *
9560 : * For the case where we're asked not to recurse, we verify that a not-null
9561 : * constraint exists on each column of each (direct) child table, throwing an
9562 : * error if not. Not throwing an error would also work, because a not-null
9563 : * constraint would be created anyway, but it'd cause a silent scan of the
9564 : * child table to verify absence of nulls. We prefer to let the user know so
9565 : * that they can add the constraint manually without having to hold
9566 : * AccessExclusiveLock while at it.
9567 : *
9568 : * However, it's also important that we do not acquire locks on children if
9569 : * the not-null constraints already exist on the parent, to avoid risking
9570 : * deadlocks during parallel pg_restore of PKs on partitioned tables.
9571 : */
9572 : static void
9573 9529 : ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
9574 : bool recurse, LOCKMODE lockmode,
9575 : AlterTableUtilityContext *context)
9576 : {
9577 : Constraint *pkconstr;
9578 9529 : List *children = NIL;
9579 9529 : bool got_children = false;
9580 :
9581 9529 : pkconstr = castNode(Constraint, cmd->def);
9582 9529 : if (pkconstr->contype != CONSTR_PRIMARY)
9583 5677 : return;
9584 :
9585 : /* Verify that columns are not-null, or request that they be made so */
9586 8309 : foreach_node(String, column, pkconstr->keys)
9587 : {
9588 : AlterTableCmd *newcmd;
9589 : Constraint *nnconstr;
9590 : HeapTuple tuple;
9591 :
9592 : /*
9593 : * First check if a suitable constraint exists. If it does, we don't
9594 : * need to request another one. We do need to bail out if it's not
9595 : * valid, though.
9596 : */
9597 645 : tuple = findNotNullConstraint(RelationGetRelid(rel), strVal(column));
9598 645 : if (tuple != NULL)
9599 : {
9600 318 : verifyNotNullPKCompatible(tuple, strVal(column));
9601 :
9602 : /* All good with this one; don't request another */
9603 310 : heap_freetuple(tuple);
9604 310 : continue;
9605 : }
9606 327 : else if (!recurse)
9607 : {
9608 : /*
9609 : * No constraint on this column. Asked not to recurse, we won't
9610 : * create one here, but verify that all children have one.
9611 : */
9612 24 : if (!got_children)
9613 : {
9614 24 : children = find_inheritance_children(RelationGetRelid(rel),
9615 : lockmode);
9616 : /* only search for children on the first time through */
9617 24 : got_children = true;
9618 : }
9619 :
9620 48 : foreach_oid(childrelid, children)
9621 : {
9622 : HeapTuple tup;
9623 :
9624 24 : tup = findNotNullConstraint(childrelid, strVal(column));
9625 24 : if (!tup)
9626 4 : ereport(ERROR,
9627 : errmsg("column \"%s\" of table \"%s\" is not marked NOT NULL",
9628 : strVal(column), get_rel_name(childrelid)));
9629 : /* verify it's good enough */
9630 20 : verifyNotNullPKCompatible(tup, strVal(column));
9631 : }
9632 : }
9633 :
9634 : /* This column is not already not-null, so add it to the queue */
9635 315 : nnconstr = makeNotNullConstraint(column);
9636 :
9637 315 : newcmd = makeNode(AlterTableCmd);
9638 315 : newcmd->subtype = AT_AddConstraint;
9639 : /* note we force recurse=true here; see above */
9640 315 : newcmd->recurse = true;
9641 315 : newcmd->def = (Node *) nnconstr;
9642 :
9643 315 : ATPrepCmd(wqueue, rel, newcmd, true, false, lockmode, context);
9644 : }
9645 : }
9646 :
9647 : /*
9648 : * Verify whether the given not-null constraint is compatible with a
9649 : * primary key. If not, an error is thrown.
9650 : */
9651 : static void
9652 338 : verifyNotNullPKCompatible(HeapTuple tuple, const char *colname)
9653 : {
9654 338 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
9655 :
9656 338 : if (conForm->contype != CONSTRAINT_NOTNULL)
9657 0 : elog(ERROR, "constraint %u is not a not-null constraint", conForm->oid);
9658 :
9659 : /* a NO INHERIT constraint is no good */
9660 338 : if (conForm->connoinherit)
9661 8 : ereport(ERROR,
9662 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9663 : errmsg("cannot create primary key on column \"%s\"", colname),
9664 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9665 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9666 : NameStr(conForm->conname), colname,
9667 : get_rel_name(conForm->conrelid), "NO INHERIT"),
9668 : errhint("You might need to make the existing constraint inheritable using %s.",
9669 : "ALTER TABLE ... ALTER CONSTRAINT ... INHERIT"));
9670 :
9671 : /* an unvalidated constraint is no good */
9672 330 : if (!conForm->convalidated)
9673 8 : ereport(ERROR,
9674 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9675 : errmsg("cannot create primary key on column \"%s\"", colname),
9676 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9677 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9678 : NameStr(conForm->conname), colname,
9679 : get_rel_name(conForm->conrelid), "NOT VALID"),
9680 : errhint("You might need to validate it using %s.",
9681 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
9682 322 : }
9683 :
9684 : /*
9685 : * ALTER TABLE ADD INDEX
9686 : *
9687 : * There is no such command in the grammar, but parse_utilcmd.c converts
9688 : * UNIQUE and PRIMARY KEY constraints into AT_AddIndex subcommands. This lets
9689 : * us schedule creation of the index at the appropriate time during ALTER.
9690 : *
9691 : * Return value is the address of the new index.
9692 : */
9693 : static ObjectAddress
9694 1065 : ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
9695 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9696 : {
9697 : bool check_rights;
9698 : bool skip_build;
9699 : bool quiet;
9700 : ObjectAddress address;
9701 :
9702 : Assert(IsA(stmt, IndexStmt));
9703 : Assert(!stmt->concurrent);
9704 :
9705 : /* The IndexStmt has already been through transformIndexStmt */
9706 : Assert(stmt->transformed);
9707 :
9708 : /* suppress schema rights check when rebuilding existing index */
9709 1065 : check_rights = !is_rebuild;
9710 : /* skip index build if phase 3 will do it or we're reusing an old one */
9711 1065 : skip_build = tab->rewrite > 0 || RelFileNumberIsValid(stmt->oldNumber);
9712 : /* suppress notices when rebuilding existing index */
9713 1065 : quiet = is_rebuild;
9714 :
9715 1065 : address = DefineIndex(NULL,
9716 : RelationGetRelid(rel),
9717 : stmt,
9718 : InvalidOid, /* no predefined OID */
9719 : InvalidOid, /* no parent index */
9720 : InvalidOid, /* no parent constraint */
9721 : -1, /* total_parts unknown */
9722 : true, /* is_alter_table */
9723 : check_rights,
9724 : false, /* check_not_in_use - we did it already */
9725 : skip_build,
9726 : quiet);
9727 :
9728 : /*
9729 : * If TryReuseIndex() stashed a relfilenumber for us, we used it for the
9730 : * new index instead of building from scratch. Restore associated fields.
9731 : * This may store InvalidSubTransactionId in both fields, in which case
9732 : * relcache.c will assume it can rebuild the relcache entry. Hence, do
9733 : * this after the CCI that made catalog rows visible to any rebuild. The
9734 : * DROP of the old edition of this index will have scheduled the storage
9735 : * for deletion at commit, so cancel that pending deletion.
9736 : */
9737 952 : if (RelFileNumberIsValid(stmt->oldNumber))
9738 : {
9739 49 : Relation irel = index_open(address.objectId, NoLock);
9740 :
9741 49 : irel->rd_createSubid = stmt->oldCreateSubid;
9742 49 : irel->rd_firstRelfilelocatorSubid = stmt->oldFirstRelfilelocatorSubid;
9743 49 : RelationPreserveStorage(irel->rd_locator, true);
9744 49 : index_close(irel, NoLock);
9745 : }
9746 :
9747 952 : return address;
9748 : }
9749 :
9750 : /*
9751 : * ALTER TABLE ADD STATISTICS
9752 : *
9753 : * This is no such command in the grammar, but we use this internally to add
9754 : * AT_ReAddStatistics subcommands to rebuild extended statistics after a table
9755 : * column type change.
9756 : */
9757 : static ObjectAddress
9758 53 : ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
9759 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9760 : {
9761 : ObjectAddress address;
9762 :
9763 : Assert(IsA(stmt, CreateStatsStmt));
9764 :
9765 : /* The CreateStatsStmt has already been through transformStatsStmt */
9766 : Assert(stmt->transformed);
9767 :
9768 53 : address = CreateStatistics(stmt, !is_rebuild);
9769 :
9770 53 : return address;
9771 : }
9772 :
9773 : /*
9774 : * ALTER TABLE ADD CONSTRAINT USING INDEX
9775 : *
9776 : * Returns the address of the new constraint.
9777 : */
9778 : static ObjectAddress
9779 5933 : ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
9780 : IndexStmt *stmt, LOCKMODE lockmode)
9781 : {
9782 5933 : Oid index_oid = stmt->indexOid;
9783 : Relation indexRel;
9784 : char *indexName;
9785 : IndexInfo *indexInfo;
9786 : char *constraintName;
9787 : char constraintType;
9788 : ObjectAddress address;
9789 : bits16 flags;
9790 :
9791 : Assert(IsA(stmt, IndexStmt));
9792 : Assert(OidIsValid(index_oid));
9793 : Assert(stmt->isconstraint);
9794 :
9795 : /*
9796 : * Doing this on partitioned tables is not a simple feature to implement,
9797 : * so let's punt for now.
9798 : */
9799 5933 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
9800 4 : ereport(ERROR,
9801 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9802 : errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX is not supported on partitioned tables")));
9803 :
9804 5929 : indexRel = index_open(index_oid, AccessShareLock);
9805 :
9806 5929 : indexName = pstrdup(RelationGetRelationName(indexRel));
9807 :
9808 5929 : indexInfo = BuildIndexInfo(indexRel);
9809 :
9810 : /* this should have been checked at parse time */
9811 5929 : if (!indexInfo->ii_Unique)
9812 0 : elog(ERROR, "index \"%s\" is not unique", indexName);
9813 :
9814 : /*
9815 : * Determine name to assign to constraint. We require a constraint to
9816 : * have the same name as the underlying index; therefore, use the index's
9817 : * existing name as the default constraint name, and if the user
9818 : * explicitly gives some other name for the constraint, rename the index
9819 : * to match.
9820 : */
9821 5929 : constraintName = stmt->idxname;
9822 5929 : if (constraintName == NULL)
9823 5912 : constraintName = indexName;
9824 17 : else if (strcmp(constraintName, indexName) != 0)
9825 : {
9826 13 : ereport(NOTICE,
9827 : (errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index \"%s\" to \"%s\"",
9828 : indexName, constraintName)));
9829 13 : RenameRelationInternal(index_oid, constraintName, false, true);
9830 : }
9831 :
9832 : /* Extra checks needed if making primary key */
9833 5929 : if (stmt->primary)
9834 3319 : index_check_primary_key(rel, indexInfo, true, stmt);
9835 :
9836 : /* Note we currently don't support EXCLUSION constraints here */
9837 5925 : if (stmt->primary)
9838 3315 : constraintType = CONSTRAINT_PRIMARY;
9839 : else
9840 2610 : constraintType = CONSTRAINT_UNIQUE;
9841 :
9842 : /* Create the catalog entries for the constraint */
9843 5925 : flags = INDEX_CONSTR_CREATE_UPDATE_INDEX |
9844 : INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS |
9845 11850 : (stmt->initdeferred ? INDEX_CONSTR_CREATE_INIT_DEFERRED : 0) |
9846 5925 : (stmt->deferrable ? INDEX_CONSTR_CREATE_DEFERRABLE : 0) |
9847 5925 : (stmt->primary ? INDEX_CONSTR_CREATE_MARK_AS_PRIMARY : 0);
9848 :
9849 5925 : address = index_constraint_create(rel,
9850 : index_oid,
9851 : InvalidOid,
9852 : indexInfo,
9853 : constraintName,
9854 : constraintType,
9855 : flags,
9856 : allowSystemTableMods,
9857 : false); /* is_internal */
9858 :
9859 5925 : index_close(indexRel, NoLock);
9860 :
9861 5925 : return address;
9862 : }
9863 :
9864 : /*
9865 : * ALTER TABLE ADD CONSTRAINT
9866 : *
9867 : * Return value is the address of the new constraint; if no constraint was
9868 : * added, InvalidObjectAddress is returned.
9869 : */
9870 : static ObjectAddress
9871 7606 : ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9872 : Constraint *newConstraint, bool recurse, bool is_readd,
9873 : LOCKMODE lockmode)
9874 : {
9875 7606 : ObjectAddress address = InvalidObjectAddress;
9876 :
9877 : Assert(IsA(newConstraint, Constraint));
9878 :
9879 : /*
9880 : * Currently, we only expect to see CONSTR_CHECK, CONSTR_NOTNULL and
9881 : * CONSTR_FOREIGN nodes arriving here (see the preprocessing done in
9882 : * parse_utilcmd.c).
9883 : */
9884 7606 : switch (newConstraint->contype)
9885 : {
9886 5867 : case CONSTR_CHECK:
9887 : case CONSTR_NOTNULL:
9888 : address =
9889 5867 : ATAddCheckNNConstraint(wqueue, tab, rel,
9890 : newConstraint, recurse, false, is_readd,
9891 : lockmode);
9892 5767 : break;
9893 :
9894 1739 : case CONSTR_FOREIGN:
9895 :
9896 : /*
9897 : * Assign or validate constraint name
9898 : */
9899 1739 : if (newConstraint->conname)
9900 : {
9901 748 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
9902 : RelationGetRelid(rel),
9903 748 : newConstraint->conname))
9904 0 : ereport(ERROR,
9905 : (errcode(ERRCODE_DUPLICATE_OBJECT),
9906 : errmsg("constraint \"%s\" for relation \"%s\" already exists",
9907 : newConstraint->conname,
9908 : RelationGetRelationName(rel))));
9909 : }
9910 : else
9911 991 : newConstraint->conname =
9912 991 : ChooseConstraintName(RelationGetRelationName(rel),
9913 991 : ChooseForeignKeyConstraintNameAddition(newConstraint->fk_attrs),
9914 : "fkey",
9915 991 : RelationGetNamespace(rel),
9916 : NIL);
9917 :
9918 1739 : address = ATAddForeignKeyConstraint(wqueue, tab, rel,
9919 : newConstraint,
9920 : recurse, false,
9921 : lockmode);
9922 1374 : break;
9923 :
9924 0 : default:
9925 0 : elog(ERROR, "unrecognized constraint type: %d",
9926 : (int) newConstraint->contype);
9927 : }
9928 :
9929 7141 : return address;
9930 : }
9931 :
9932 : /*
9933 : * Generate the column-name portion of the constraint name for a new foreign
9934 : * key given the list of column names that reference the referenced
9935 : * table. This will be passed to ChooseConstraintName along with the parent
9936 : * table name and the "fkey" suffix.
9937 : *
9938 : * We know that less than NAMEDATALEN characters will actually be used, so we
9939 : * can truncate the result once we've generated that many.
9940 : *
9941 : * XXX see also ChooseExtendedStatisticNameAddition and
9942 : * ChooseIndexNameAddition.
9943 : */
9944 : static char *
9945 991 : ChooseForeignKeyConstraintNameAddition(List *colnames)
9946 : {
9947 : char buf[NAMEDATALEN * 2];
9948 991 : int buflen = 0;
9949 : ListCell *lc;
9950 :
9951 991 : buf[0] = '\0';
9952 2260 : foreach(lc, colnames)
9953 : {
9954 1269 : const char *name = strVal(lfirst(lc));
9955 :
9956 1269 : if (buflen > 0)
9957 278 : buf[buflen++] = '_'; /* insert _ between names */
9958 :
9959 : /*
9960 : * At this point we have buflen <= NAMEDATALEN. name should be less
9961 : * than NAMEDATALEN already, but use strlcpy for paranoia.
9962 : */
9963 1269 : strlcpy(buf + buflen, name, NAMEDATALEN);
9964 1269 : buflen += strlen(buf + buflen);
9965 1269 : if (buflen >= NAMEDATALEN)
9966 0 : break;
9967 : }
9968 991 : return pstrdup(buf);
9969 : }
9970 :
9971 : /*
9972 : * Add a check or not-null constraint to a single table and its children.
9973 : * Returns the address of the constraint added to the parent relation,
9974 : * if one gets added, or InvalidObjectAddress otherwise.
9975 : *
9976 : * Subroutine for ATExecAddConstraint.
9977 : *
9978 : * We must recurse to child tables during execution, rather than using
9979 : * ALTER TABLE's normal prep-time recursion. The reason is that all the
9980 : * constraints *must* be given the same name, else they won't be seen as
9981 : * related later. If the user didn't explicitly specify a name, then
9982 : * AddRelationNewConstraints would normally assign different names to the
9983 : * child constraints. To fix that, we must capture the name assigned at
9984 : * the parent table and pass that down.
9985 : */
9986 : static ObjectAddress
9987 6518 : ATAddCheckNNConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9988 : Constraint *constr, bool recurse, bool recursing,
9989 : bool is_readd, LOCKMODE lockmode)
9990 : {
9991 : List *newcons;
9992 : ListCell *lcon;
9993 : List *children;
9994 : ListCell *child;
9995 6518 : ObjectAddress address = InvalidObjectAddress;
9996 :
9997 : /* Guard against stack overflow due to overly deep inheritance tree. */
9998 6518 : check_stack_depth();
9999 :
10000 : /* At top level, permission check was done in ATPrepCmd, else do it */
10001 6518 : if (recursing)
10002 651 : ATSimplePermissions(AT_AddConstraint, rel,
10003 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
10004 :
10005 : /*
10006 : * Call AddRelationNewConstraints to do the work, making sure it works on
10007 : * a copy of the Constraint so transformExpr can't modify the original. It
10008 : * returns a list of cooked constraints.
10009 : *
10010 : * If the constraint ends up getting merged with a pre-existing one, it's
10011 : * omitted from the returned list, which is what we want: we do not need
10012 : * to do any validation work. That can only happen at child tables,
10013 : * though, since we disallow merging at the top level.
10014 : */
10015 6518 : newcons = AddRelationNewConstraints(rel, NIL,
10016 6518 : list_make1(copyObject(constr)),
10017 6518 : recursing || is_readd, /* allow_merge */
10018 : !recursing, /* is_local */
10019 : is_readd, /* is_internal */
10020 13036 : NULL); /* queryString not available
10021 : * here */
10022 :
10023 : /* we don't expect more than one constraint here */
10024 : Assert(list_length(newcons) <= 1);
10025 :
10026 : /* Add each to-be-validated constraint to Phase 3's queue */
10027 12714 : foreach(lcon, newcons)
10028 : {
10029 6292 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lcon);
10030 :
10031 6292 : if (!ccon->skip_validation && ccon->contype != CONSTR_NOTNULL)
10032 : {
10033 : NewConstraint *newcon;
10034 :
10035 743 : newcon = palloc0_object(NewConstraint);
10036 743 : newcon->name = ccon->name;
10037 743 : newcon->contype = ccon->contype;
10038 743 : newcon->qual = ccon->expr;
10039 :
10040 743 : tab->constraints = lappend(tab->constraints, newcon);
10041 : }
10042 :
10043 : /* Save the actually assigned name if it was defaulted */
10044 6292 : if (constr->conname == NULL)
10045 4942 : constr->conname = ccon->name;
10046 :
10047 : /*
10048 : * If adding a valid not-null constraint, set the pg_attribute flag
10049 : * and tell phase 3 to verify existing rows, if needed. For an
10050 : * invalid constraint, just set attnotnull, without queueing
10051 : * verification.
10052 : */
10053 6292 : if (constr->contype == CONSTR_NOTNULL)
10054 5244 : set_attnotnull(wqueue, rel, ccon->attnum,
10055 5244 : !constr->skip_validation,
10056 5244 : !constr->skip_validation);
10057 :
10058 6292 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
10059 : }
10060 :
10061 : /* At this point we must have a locked-down name to use */
10062 : Assert(newcons == NIL || constr->conname != NULL);
10063 :
10064 : /* Advance command counter in case same table is visited multiple times */
10065 6422 : CommandCounterIncrement();
10066 :
10067 : /*
10068 : * If the constraint got merged with an existing constraint, we're done.
10069 : * We mustn't recurse to child tables in this case, because they've
10070 : * already got the constraint, and visiting them again would lead to an
10071 : * incorrect value for coninhcount.
10072 : */
10073 6422 : if (newcons == NIL)
10074 130 : return address;
10075 :
10076 : /*
10077 : * If adding a NO INHERIT constraint, no need to find our children.
10078 : */
10079 6292 : if (constr->is_no_inherit)
10080 56 : return address;
10081 :
10082 : /*
10083 : * Propagate to children as appropriate. Unlike most other ALTER
10084 : * routines, we have to do this one level of recursion at a time; we can't
10085 : * use find_all_inheritors to do it in one pass.
10086 : */
10087 : children =
10088 6236 : find_inheritance_children(RelationGetRelid(rel), lockmode);
10089 :
10090 : /*
10091 : * Check if ONLY was specified with ALTER TABLE. If so, allow the
10092 : * constraint creation only if there are no children currently. Error out
10093 : * otherwise.
10094 : */
10095 6236 : if (!recurse && children != NIL)
10096 4 : ereport(ERROR,
10097 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10098 : errmsg("constraint must be added to child tables too")));
10099 :
10100 : /*
10101 : * Recurse to create the constraint on each child.
10102 : */
10103 6863 : foreach(child, children)
10104 : {
10105 651 : Oid childrelid = lfirst_oid(child);
10106 : Relation childrel;
10107 : AlteredTableInfo *childtab;
10108 :
10109 : /* find_inheritance_children already got lock */
10110 651 : childrel = table_open(childrelid, NoLock);
10111 651 : CheckAlterTableIsSafe(childrel);
10112 :
10113 : /* Find or create work queue entry for this table */
10114 651 : childtab = ATGetQueueEntry(wqueue, childrel);
10115 :
10116 : /* Recurse to this child */
10117 651 : ATAddCheckNNConstraint(wqueue, childtab, childrel,
10118 : constr, recurse, true, is_readd, lockmode);
10119 :
10120 631 : table_close(childrel, NoLock);
10121 : }
10122 :
10123 6212 : return address;
10124 : }
10125 :
10126 : /*
10127 : * Add a foreign-key constraint to a single table; return the new constraint's
10128 : * address.
10129 : *
10130 : * Subroutine for ATExecAddConstraint. Must already hold exclusive
10131 : * lock on the rel, and have done appropriate validity checks for it.
10132 : * We do permissions checks here, however.
10133 : *
10134 : * When the referenced or referencing tables (or both) are partitioned,
10135 : * multiple pg_constraint rows are required -- one for each partitioned table
10136 : * and each partition on each side (fortunately, not one for every combination
10137 : * thereof). We also need action triggers on each leaf partition on the
10138 : * referenced side, and check triggers on each leaf partition on the
10139 : * referencing side.
10140 : */
10141 : static ObjectAddress
10142 1739 : ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
10143 : Constraint *fkconstraint,
10144 : bool recurse, bool recursing, LOCKMODE lockmode)
10145 : {
10146 : Relation pkrel;
10147 1739 : int16 pkattnum[INDEX_MAX_KEYS] = {0};
10148 1739 : int16 fkattnum[INDEX_MAX_KEYS] = {0};
10149 1739 : Oid pktypoid[INDEX_MAX_KEYS] = {0};
10150 1739 : Oid fktypoid[INDEX_MAX_KEYS] = {0};
10151 1739 : Oid pkcolloid[INDEX_MAX_KEYS] = {0};
10152 1739 : Oid fkcolloid[INDEX_MAX_KEYS] = {0};
10153 1739 : Oid opclasses[INDEX_MAX_KEYS] = {0};
10154 1739 : Oid pfeqoperators[INDEX_MAX_KEYS] = {0};
10155 1739 : Oid ppeqoperators[INDEX_MAX_KEYS] = {0};
10156 1739 : Oid ffeqoperators[INDEX_MAX_KEYS] = {0};
10157 1739 : int16 fkdelsetcols[INDEX_MAX_KEYS] = {0};
10158 : bool with_period;
10159 : bool pk_has_without_overlaps;
10160 : int i;
10161 : int numfks,
10162 : numpks,
10163 : numfkdelsetcols;
10164 : Oid indexOid;
10165 : bool old_check_ok;
10166 : ObjectAddress address;
10167 1739 : ListCell *old_pfeqop_item = list_head(fkconstraint->old_conpfeqop);
10168 :
10169 : /*
10170 : * Grab ShareRowExclusiveLock on the pk table, so that someone doesn't
10171 : * delete rows out from under us.
10172 : */
10173 1739 : if (OidIsValid(fkconstraint->old_pktable_oid))
10174 48 : pkrel = table_open(fkconstraint->old_pktable_oid, ShareRowExclusiveLock);
10175 : else
10176 1691 : pkrel = table_openrv(fkconstraint->pktable, ShareRowExclusiveLock);
10177 :
10178 : /*
10179 : * Validity checks (permission checks wait till we have the column
10180 : * numbers)
10181 : */
10182 1735 : if (!recurse && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10183 4 : ereport(ERROR,
10184 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
10185 : errmsg("cannot use ONLY for foreign key on partitioned table \"%s\" referencing relation \"%s\"",
10186 : RelationGetRelationName(rel),
10187 : RelationGetRelationName(pkrel)));
10188 :
10189 1731 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10190 236 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10191 0 : ereport(ERROR,
10192 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10193 : errmsg("referenced relation \"%s\" is not a table",
10194 : RelationGetRelationName(pkrel))));
10195 :
10196 1731 : if (!allowSystemTableMods && IsSystemRelation(pkrel))
10197 1 : ereport(ERROR,
10198 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
10199 : errmsg("permission denied: \"%s\" is a system catalog",
10200 : RelationGetRelationName(pkrel))));
10201 :
10202 : /*
10203 : * References from permanent or unlogged tables to temp tables, and from
10204 : * permanent tables to unlogged tables, are disallowed because the
10205 : * referenced data can vanish out from under us. References from temp
10206 : * tables to any other table type are also disallowed, because other
10207 : * backends might need to run the RI triggers on the perm table, but they
10208 : * can't reliably see tuples in the local buffers of other backends.
10209 : */
10210 1730 : switch (rel->rd_rel->relpersistence)
10211 : {
10212 1537 : case RELPERSISTENCE_PERMANENT:
10213 1537 : if (!RelationIsPermanent(pkrel))
10214 0 : ereport(ERROR,
10215 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10216 : errmsg("constraints on permanent tables may reference only permanent tables")));
10217 1537 : break;
10218 8 : case RELPERSISTENCE_UNLOGGED:
10219 8 : if (!RelationIsPermanent(pkrel)
10220 8 : && pkrel->rd_rel->relpersistence != RELPERSISTENCE_UNLOGGED)
10221 0 : ereport(ERROR,
10222 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10223 : errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
10224 8 : break;
10225 185 : case RELPERSISTENCE_TEMP:
10226 185 : if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
10227 0 : ereport(ERROR,
10228 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10229 : errmsg("constraints on temporary tables may reference only temporary tables")));
10230 185 : if (!pkrel->rd_islocaltemp || !rel->rd_islocaltemp)
10231 0 : ereport(ERROR,
10232 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10233 : errmsg("constraints on temporary tables must involve temporary tables of this session")));
10234 185 : break;
10235 : }
10236 :
10237 : /*
10238 : * Look up the referencing attributes to make sure they exist, and record
10239 : * their attnums and type and collation OIDs.
10240 : */
10241 1730 : numfks = transformColumnNameList(RelationGetRelid(rel),
10242 : fkconstraint->fk_attrs,
10243 : fkattnum, fktypoid, fkcolloid);
10244 1710 : with_period = fkconstraint->fk_with_period || fkconstraint->pk_with_period;
10245 1710 : if (with_period && !fkconstraint->fk_with_period)
10246 16 : ereport(ERROR,
10247 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10248 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10249 :
10250 1694 : numfkdelsetcols = transformColumnNameList(RelationGetRelid(rel),
10251 : fkconstraint->fk_del_set_cols,
10252 : fkdelsetcols, NULL, NULL);
10253 1690 : numfkdelsetcols = validateFkOnDeleteSetColumns(numfks, fkattnum,
10254 : numfkdelsetcols,
10255 : fkdelsetcols,
10256 : fkconstraint->fk_del_set_cols);
10257 :
10258 : /*
10259 : * If the attribute list for the referenced table was omitted, lookup the
10260 : * definition of the primary key and use it. Otherwise, validate the
10261 : * supplied attribute list. In either case, discover the index OID and
10262 : * index opclasses, and the attnums and type and collation OIDs of the
10263 : * attributes.
10264 : */
10265 1686 : if (fkconstraint->pk_attrs == NIL)
10266 : {
10267 811 : numpks = transformFkeyGetPrimaryKey(pkrel, &indexOid,
10268 : &fkconstraint->pk_attrs,
10269 : pkattnum, pktypoid, pkcolloid,
10270 : opclasses, &pk_has_without_overlaps);
10271 :
10272 : /* If the primary key uses WITHOUT OVERLAPS, the fk must use PERIOD */
10273 811 : if (pk_has_without_overlaps && !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 : else
10279 : {
10280 875 : numpks = transformColumnNameList(RelationGetRelid(pkrel),
10281 : fkconstraint->pk_attrs,
10282 : pkattnum, pktypoid, pkcolloid);
10283 :
10284 : /* Since we got pk_attrs, one should be a period. */
10285 855 : if (with_period && !fkconstraint->pk_with_period)
10286 16 : ereport(ERROR,
10287 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10288 : errmsg("foreign key uses PERIOD on the referencing table but not the referenced table"));
10289 :
10290 : /* Look for an index matching the column list */
10291 839 : indexOid = transformFkeyCheckAttrs(pkrel, numpks, pkattnum,
10292 : with_period, opclasses, &pk_has_without_overlaps);
10293 : }
10294 :
10295 : /*
10296 : * If the referenced primary key has WITHOUT OVERLAPS, the foreign key
10297 : * must use PERIOD.
10298 : */
10299 1610 : if (pk_has_without_overlaps && !with_period)
10300 8 : ereport(ERROR,
10301 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10302 : errmsg("foreign key must use PERIOD when referencing a primary key using WITHOUT OVERLAPS"));
10303 :
10304 : /*
10305 : * Now we can check permissions.
10306 : */
10307 1602 : checkFkeyPermissions(pkrel, pkattnum, numpks);
10308 :
10309 : /*
10310 : * Check some things for generated columns.
10311 : */
10312 3769 : for (i = 0; i < numfks; i++)
10313 : {
10314 2187 : char attgenerated = TupleDescAttr(RelationGetDescr(rel), fkattnum[i] - 1)->attgenerated;
10315 :
10316 2187 : if (attgenerated)
10317 : {
10318 : /*
10319 : * Check restrictions on UPDATE/DELETE actions, per SQL standard
10320 : */
10321 32 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10322 32 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT ||
10323 32 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE)
10324 8 : ereport(ERROR,
10325 : (errcode(ERRCODE_SYNTAX_ERROR),
10326 : errmsg("invalid %s action for foreign key constraint containing generated column",
10327 : "ON UPDATE")));
10328 24 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10329 16 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10330 8 : ereport(ERROR,
10331 : (errcode(ERRCODE_SYNTAX_ERROR),
10332 : errmsg("invalid %s action for foreign key constraint containing generated column",
10333 : "ON DELETE")));
10334 : }
10335 :
10336 : /*
10337 : * FKs on virtual columns are not supported. This would require
10338 : * various additional support in ri_triggers.c, including special
10339 : * handling in ri_NullCheck(), ri_KeysEqual(),
10340 : * RI_FKey_fk_upd_check_required() (since all virtual columns appear
10341 : * as NULL there). Also not really practical as long as you can't
10342 : * index virtual columns.
10343 : */
10344 2171 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
10345 4 : ereport(ERROR,
10346 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10347 : errmsg("foreign key constraints on virtual generated columns are not supported")));
10348 : }
10349 :
10350 : /*
10351 : * Some actions are currently unsupported for foreign keys using PERIOD.
10352 : */
10353 1582 : if (fkconstraint->fk_with_period)
10354 : {
10355 178 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_RESTRICT ||
10356 170 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE ||
10357 158 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10358 146 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT)
10359 44 : ereport(ERROR,
10360 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10361 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10362 : "ON UPDATE"));
10363 :
10364 134 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_RESTRICT ||
10365 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_CASCADE ||
10366 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10367 130 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10368 4 : ereport(ERROR,
10369 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10370 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10371 : "ON DELETE"));
10372 : }
10373 :
10374 : /*
10375 : * Look up the equality operators to use in the constraint.
10376 : *
10377 : * Note that we have to be careful about the difference between the actual
10378 : * PK column type and the opclass' declared input type, which might be
10379 : * only binary-compatible with it. The declared opcintype is the right
10380 : * thing to probe pg_amop with.
10381 : */
10382 1534 : if (numfks != numpks)
10383 0 : ereport(ERROR,
10384 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
10385 : errmsg("number of referencing and referenced columns for foreign key disagree")));
10386 :
10387 : /*
10388 : * On the strength of a previous constraint, we might avoid scanning
10389 : * tables to validate this one. See below.
10390 : */
10391 1534 : old_check_ok = (fkconstraint->old_conpfeqop != NIL);
10392 : Assert(!old_check_ok || numfks == list_length(fkconstraint->old_conpfeqop));
10393 :
10394 3349 : for (i = 0; i < numpks; i++)
10395 : {
10396 1975 : Oid pktype = pktypoid[i];
10397 1975 : Oid fktype = fktypoid[i];
10398 : Oid fktyped;
10399 1975 : Oid pkcoll = pkcolloid[i];
10400 1975 : Oid fkcoll = fkcolloid[i];
10401 : HeapTuple cla_ht;
10402 : Form_pg_opclass cla_tup;
10403 : Oid amid;
10404 : Oid opfamily;
10405 : Oid opcintype;
10406 : bool for_overlaps;
10407 : CompareType cmptype;
10408 : Oid pfeqop;
10409 : Oid ppeqop;
10410 : Oid ffeqop;
10411 : int16 eqstrategy;
10412 : Oid pfeqop_right;
10413 :
10414 : /* We need several fields out of the pg_opclass entry */
10415 1975 : cla_ht = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclasses[i]));
10416 1975 : if (!HeapTupleIsValid(cla_ht))
10417 0 : elog(ERROR, "cache lookup failed for opclass %u", opclasses[i]);
10418 1975 : cla_tup = (Form_pg_opclass) GETSTRUCT(cla_ht);
10419 1975 : amid = cla_tup->opcmethod;
10420 1975 : opfamily = cla_tup->opcfamily;
10421 1975 : opcintype = cla_tup->opcintype;
10422 1975 : ReleaseSysCache(cla_ht);
10423 :
10424 : /*
10425 : * Get strategy number from index AM.
10426 : *
10427 : * For a normal foreign-key constraint, this should not fail, since we
10428 : * already checked that the index is unique and should therefore have
10429 : * appropriate equal operators. For a period foreign key, this could
10430 : * fail if we selected a non-matching exclusion constraint earlier.
10431 : * (XXX Maybe we should do these lookups earlier so we don't end up
10432 : * doing that.)
10433 : */
10434 1975 : for_overlaps = with_period && i == numpks - 1;
10435 1975 : cmptype = for_overlaps ? COMPARE_OVERLAP : COMPARE_EQ;
10436 1975 : eqstrategy = IndexAmTranslateCompareType(cmptype, amid, opfamily, true);
10437 1975 : if (eqstrategy == InvalidStrategy)
10438 0 : ereport(ERROR,
10439 : errcode(ERRCODE_UNDEFINED_OBJECT),
10440 : for_overlaps
10441 : ? errmsg("could not identify an overlaps operator for foreign key")
10442 : : errmsg("could not identify an equality operator for foreign key"),
10443 : errdetail("Could not translate compare type %d for operator family \"%s\" of access method \"%s\".",
10444 : cmptype, get_opfamily_name(opfamily, false), get_am_name(amid)));
10445 :
10446 : /*
10447 : * There had better be a primary equality operator for the index.
10448 : * We'll use it for PK = PK comparisons.
10449 : */
10450 1975 : ppeqop = get_opfamily_member(opfamily, opcintype, opcintype,
10451 : eqstrategy);
10452 :
10453 1975 : if (!OidIsValid(ppeqop))
10454 0 : elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
10455 : eqstrategy, opcintype, opcintype, opfamily);
10456 :
10457 : /*
10458 : * Are there equality operators that take exactly the FK type? Assume
10459 : * we should look through any domain here.
10460 : */
10461 1975 : fktyped = getBaseType(fktype);
10462 :
10463 1975 : pfeqop = get_opfamily_member(opfamily, opcintype, fktyped,
10464 : eqstrategy);
10465 1975 : if (OidIsValid(pfeqop))
10466 : {
10467 1526 : pfeqop_right = fktyped;
10468 1526 : ffeqop = get_opfamily_member(opfamily, fktyped, fktyped,
10469 : eqstrategy);
10470 : }
10471 : else
10472 : {
10473 : /* keep compiler quiet */
10474 449 : pfeqop_right = InvalidOid;
10475 449 : ffeqop = InvalidOid;
10476 : }
10477 :
10478 1975 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10479 : {
10480 : /*
10481 : * Otherwise, look for an implicit cast from the FK type to the
10482 : * opcintype, and if found, use the primary equality operator.
10483 : * This is a bit tricky because opcintype might be a polymorphic
10484 : * type such as ANYARRAY or ANYENUM; so what we have to test is
10485 : * whether the two actual column types can be concurrently cast to
10486 : * that type. (Otherwise, we'd fail to reject combinations such
10487 : * as int[] and point[].)
10488 : */
10489 : Oid input_typeids[2];
10490 : Oid target_typeids[2];
10491 :
10492 449 : input_typeids[0] = pktype;
10493 449 : input_typeids[1] = fktype;
10494 449 : target_typeids[0] = opcintype;
10495 449 : target_typeids[1] = opcintype;
10496 449 : if (can_coerce_type(2, input_typeids, target_typeids,
10497 : COERCION_IMPLICIT))
10498 : {
10499 297 : pfeqop = ffeqop = ppeqop;
10500 297 : pfeqop_right = opcintype;
10501 : }
10502 : }
10503 :
10504 1975 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10505 152 : ereport(ERROR,
10506 : (errcode(ERRCODE_DATATYPE_MISMATCH),
10507 : errmsg("foreign key constraint \"%s\" cannot be implemented",
10508 : fkconstraint->conname),
10509 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10510 : "are of incompatible types: %s and %s.",
10511 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10512 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10513 : format_type_be(fktype),
10514 : format_type_be(pktype))));
10515 :
10516 : /*
10517 : * This shouldn't be possible, but better check to make sure we have a
10518 : * consistent state for the check below.
10519 : */
10520 1823 : if ((OidIsValid(pkcoll) && !OidIsValid(fkcoll)) || (!OidIsValid(pkcoll) && OidIsValid(fkcoll)))
10521 0 : elog(ERROR, "key columns are not both collatable");
10522 :
10523 1823 : if (OidIsValid(pkcoll) && OidIsValid(fkcoll))
10524 : {
10525 : bool pkcolldet;
10526 : bool fkcolldet;
10527 :
10528 69 : pkcolldet = get_collation_isdeterministic(pkcoll);
10529 69 : fkcolldet = get_collation_isdeterministic(fkcoll);
10530 :
10531 : /*
10532 : * SQL requires that both collations are the same. This is
10533 : * because we need a consistent notion of equality on both
10534 : * columns. We relax this by allowing different collations if
10535 : * they are both deterministic. (This is also for backward
10536 : * compatibility, because PostgreSQL has always allowed this.)
10537 : */
10538 69 : if ((!pkcolldet || !fkcolldet) && pkcoll != fkcoll)
10539 8 : ereport(ERROR,
10540 : (errcode(ERRCODE_COLLATION_MISMATCH),
10541 : errmsg("foreign key constraint \"%s\" cannot be implemented", fkconstraint->conname),
10542 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10543 : "have incompatible collations: \"%s\" and \"%s\". "
10544 : "If either collation is nondeterministic, then both collations have to be the same.",
10545 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10546 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10547 : get_collation_name(fkcoll),
10548 : get_collation_name(pkcoll))));
10549 : }
10550 :
10551 1815 : if (old_check_ok)
10552 : {
10553 : /*
10554 : * When a pfeqop changes, revalidate the constraint. We could
10555 : * permit intra-opfamily changes, but that adds subtle complexity
10556 : * without any concrete benefit for core types. We need not
10557 : * assess ppeqop or ffeqop, which RI_Initial_Check() does not use.
10558 : */
10559 4 : old_check_ok = (pfeqop == lfirst_oid(old_pfeqop_item));
10560 4 : old_pfeqop_item = lnext(fkconstraint->old_conpfeqop,
10561 : old_pfeqop_item);
10562 : }
10563 1815 : if (old_check_ok)
10564 : {
10565 : Oid old_fktype;
10566 : Oid new_fktype;
10567 : CoercionPathType old_pathtype;
10568 : CoercionPathType new_pathtype;
10569 : Oid old_castfunc;
10570 : Oid new_castfunc;
10571 : Oid old_fkcoll;
10572 : Oid new_fkcoll;
10573 4 : Form_pg_attribute attr = TupleDescAttr(tab->oldDesc,
10574 4 : fkattnum[i] - 1);
10575 :
10576 : /*
10577 : * Identify coercion pathways from each of the old and new FK-side
10578 : * column types to the right (foreign) operand type of the pfeqop.
10579 : * We may assume that pg_constraint.conkey is not changing.
10580 : */
10581 4 : old_fktype = attr->atttypid;
10582 4 : new_fktype = fktype;
10583 4 : old_pathtype = findFkeyCast(pfeqop_right, old_fktype,
10584 : &old_castfunc);
10585 4 : new_pathtype = findFkeyCast(pfeqop_right, new_fktype,
10586 : &new_castfunc);
10587 :
10588 4 : old_fkcoll = attr->attcollation;
10589 4 : new_fkcoll = fkcoll;
10590 :
10591 : /*
10592 : * Upon a change to the cast from the FK column to its pfeqop
10593 : * operand, revalidate the constraint. For this evaluation, a
10594 : * binary coercion cast is equivalent to no cast at all. While
10595 : * type implementors should design implicit casts with an eye
10596 : * toward consistency of operations like equality, we cannot
10597 : * assume here that they have done so.
10598 : *
10599 : * A function with a polymorphic argument could change behavior
10600 : * arbitrarily in response to get_fn_expr_argtype(). Therefore,
10601 : * when the cast destination is polymorphic, we only avoid
10602 : * revalidation if the input type has not changed at all. Given
10603 : * just the core data types and operator classes, this requirement
10604 : * prevents no would-be optimizations.
10605 : *
10606 : * If the cast converts from a base type to a domain thereon, then
10607 : * that domain type must be the opcintype of the unique index.
10608 : * Necessarily, the primary key column must then be of the domain
10609 : * type. Since the constraint was previously valid, all values on
10610 : * the foreign side necessarily exist on the primary side and in
10611 : * turn conform to the domain. Consequently, we need not treat
10612 : * domains specially here.
10613 : *
10614 : * If the collation changes, revalidation is required, unless both
10615 : * collations are deterministic, because those share the same
10616 : * notion of equality (because texteq reduces to bitwise
10617 : * equality).
10618 : *
10619 : * We need not directly consider the PK type. It's necessarily
10620 : * binary coercible to the opcintype of the unique index column,
10621 : * and ri_triggers.c will only deal with PK datums in terms of
10622 : * that opcintype. Changing the opcintype also changes pfeqop.
10623 : */
10624 4 : old_check_ok = (new_pathtype == old_pathtype &&
10625 4 : new_castfunc == old_castfunc &&
10626 4 : (!IsPolymorphicType(pfeqop_right) ||
10627 8 : new_fktype == old_fktype) &&
10628 0 : (new_fkcoll == old_fkcoll ||
10629 0 : (get_collation_isdeterministic(old_fkcoll) && get_collation_isdeterministic(new_fkcoll))));
10630 : }
10631 :
10632 1815 : pfeqoperators[i] = pfeqop;
10633 1815 : ppeqoperators[i] = ppeqop;
10634 1815 : ffeqoperators[i] = ffeqop;
10635 : }
10636 :
10637 : /*
10638 : * For FKs with PERIOD we need additional operators to check whether the
10639 : * referencing row's range is contained by the aggregated ranges of the
10640 : * referenced row(s). For rangetypes and multirangetypes this is
10641 : * fk.periodatt <@ range_agg(pk.periodatt). Those are the only types we
10642 : * support for now. FKs will look these up at "runtime", but we should
10643 : * make sure the lookup works here, even if we don't use the values.
10644 : */
10645 1374 : if (with_period)
10646 : {
10647 : Oid periodoperoid;
10648 : Oid aggedperiodoperoid;
10649 : Oid intersectoperoid;
10650 :
10651 118 : FindFKPeriodOpers(opclasses[numpks - 1], &periodoperoid, &aggedperiodoperoid,
10652 : &intersectoperoid);
10653 : }
10654 :
10655 : /* First, create the constraint catalog entry itself. */
10656 1374 : address = addFkConstraint(addFkBothSides,
10657 : fkconstraint->conname, fkconstraint, rel, pkrel,
10658 : indexOid,
10659 : InvalidOid, /* no parent constraint */
10660 : numfks,
10661 : pkattnum,
10662 : fkattnum,
10663 : pfeqoperators,
10664 : ppeqoperators,
10665 : ffeqoperators,
10666 : numfkdelsetcols,
10667 : fkdelsetcols,
10668 : false,
10669 : with_period);
10670 :
10671 : /* Next process the action triggers at the referenced side and recurse */
10672 1374 : addFkRecurseReferenced(fkconstraint, rel, pkrel,
10673 : indexOid,
10674 : address.objectId,
10675 : numfks,
10676 : pkattnum,
10677 : fkattnum,
10678 : pfeqoperators,
10679 : ppeqoperators,
10680 : ffeqoperators,
10681 : numfkdelsetcols,
10682 : fkdelsetcols,
10683 : old_check_ok,
10684 : InvalidOid, InvalidOid,
10685 : with_period);
10686 :
10687 : /* Lastly create the check triggers at the referencing side and recurse */
10688 1374 : addFkRecurseReferencing(wqueue, fkconstraint, rel, pkrel,
10689 : indexOid,
10690 : address.objectId,
10691 : numfks,
10692 : pkattnum,
10693 : fkattnum,
10694 : pfeqoperators,
10695 : ppeqoperators,
10696 : ffeqoperators,
10697 : numfkdelsetcols,
10698 : fkdelsetcols,
10699 : old_check_ok,
10700 : lockmode,
10701 : InvalidOid, InvalidOid,
10702 : with_period);
10703 :
10704 : /*
10705 : * Done. Close pk table, but keep lock until we've committed.
10706 : */
10707 1374 : table_close(pkrel, NoLock);
10708 :
10709 1374 : return address;
10710 : }
10711 :
10712 : /*
10713 : * validateFkOnDeleteSetColumns
10714 : * Verifies that columns used in ON DELETE SET NULL/DEFAULT (...)
10715 : * column lists are valid.
10716 : *
10717 : * If there are duplicates in the fksetcolsattnums[] array, this silently
10718 : * removes the dups. The new count of numfksetcols is returned.
10719 : */
10720 : static int
10721 1690 : validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
10722 : int numfksetcols, int16 *fksetcolsattnums,
10723 : List *fksetcols)
10724 : {
10725 1690 : int numcolsout = 0;
10726 :
10727 1710 : for (int i = 0; i < numfksetcols; i++)
10728 : {
10729 24 : int16 setcol_attnum = fksetcolsattnums[i];
10730 24 : bool seen = false;
10731 :
10732 : /* Make sure it's in fkattnums[] */
10733 44 : for (int j = 0; j < numfks; j++)
10734 : {
10735 40 : if (fkattnums[j] == setcol_attnum)
10736 : {
10737 20 : seen = true;
10738 20 : break;
10739 : }
10740 : }
10741 :
10742 24 : if (!seen)
10743 : {
10744 4 : char *col = strVal(list_nth(fksetcols, i));
10745 :
10746 4 : ereport(ERROR,
10747 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
10748 : errmsg("column \"%s\" referenced in ON DELETE SET action must be part of foreign key", col)));
10749 : }
10750 :
10751 : /* Now check for dups */
10752 20 : seen = false;
10753 20 : for (int j = 0; j < numcolsout; j++)
10754 : {
10755 4 : if (fksetcolsattnums[j] == setcol_attnum)
10756 : {
10757 4 : seen = true;
10758 4 : break;
10759 : }
10760 : }
10761 20 : if (!seen)
10762 16 : fksetcolsattnums[numcolsout++] = setcol_attnum;
10763 : }
10764 1686 : return numcolsout;
10765 : }
10766 :
10767 : /*
10768 : * addFkConstraint
10769 : * Install pg_constraint entries to implement a foreign key constraint.
10770 : * Caller must separately invoke addFkRecurseReferenced and
10771 : * addFkRecurseReferencing, as appropriate, to install pg_trigger entries
10772 : * and (for partitioned tables) recurse to partitions.
10773 : *
10774 : * fkside: the side of the FK (or both) to create. Caller should
10775 : * call addFkRecurseReferenced if this is addFkReferencedSide,
10776 : * addFkRecurseReferencing if it's addFkReferencingSide, or both if it's
10777 : * addFkBothSides.
10778 : * constraintname: the base name for the constraint being added,
10779 : * copied to fkconstraint->conname if the latter is not set
10780 : * fkconstraint: the constraint being added
10781 : * rel: the root referencing relation
10782 : * pkrel: the referenced relation; might be a partition, if recursing
10783 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10784 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10785 : * top-level constraint
10786 : * numfks: the number of columns in the foreign key
10787 : * pkattnum: the attnum array of referenced attributes
10788 : * fkattnum: the attnum array of referencing attributes
10789 : * pf/pp/ffeqoperators: OID array of operators between columns
10790 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10791 : * (...) clause
10792 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10793 : * NULL/DEFAULT clause
10794 : * with_period: true if this is a temporal FK
10795 : */
10796 : static ObjectAddress
10797 2741 : addFkConstraint(addFkConstraintSides fkside,
10798 : char *constraintname, Constraint *fkconstraint,
10799 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
10800 : int numfks, int16 *pkattnum,
10801 : int16 *fkattnum, Oid *pfeqoperators, Oid *ppeqoperators,
10802 : Oid *ffeqoperators, int numfkdelsetcols, int16 *fkdelsetcols,
10803 : bool is_internal, bool with_period)
10804 : {
10805 : ObjectAddress address;
10806 : Oid constrOid;
10807 : char *conname;
10808 : bool conislocal;
10809 : int16 coninhcount;
10810 : bool connoinherit;
10811 :
10812 : /*
10813 : * Verify relkind for each referenced partition. At the top level, this
10814 : * is redundant with a previous check, but we need it when recursing.
10815 : */
10816 2741 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10817 589 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10818 0 : ereport(ERROR,
10819 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10820 : errmsg("referenced relation \"%s\" is not a table",
10821 : RelationGetRelationName(pkrel))));
10822 :
10823 : /*
10824 : * Caller supplies us with a constraint name; however, it may be used in
10825 : * this partition, so come up with a different one in that case. Unless
10826 : * truncation to NAMEDATALEN dictates otherwise, the new name will be the
10827 : * supplied name with an underscore and digit(s) appended.
10828 : */
10829 2741 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
10830 : RelationGetRelid(rel),
10831 : constraintname))
10832 811 : conname = ChooseConstraintName(constraintname,
10833 : NULL,
10834 : "",
10835 811 : RelationGetNamespace(rel), NIL);
10836 : else
10837 1930 : conname = constraintname;
10838 :
10839 2741 : if (fkconstraint->conname == NULL)
10840 319 : fkconstraint->conname = pstrdup(conname);
10841 :
10842 2741 : if (OidIsValid(parentConstr))
10843 : {
10844 1367 : conislocal = false;
10845 1367 : coninhcount = 1;
10846 1367 : connoinherit = false;
10847 : }
10848 : else
10849 : {
10850 1374 : conislocal = true;
10851 1374 : coninhcount = 0;
10852 :
10853 : /*
10854 : * always inherit for partitioned tables, never for legacy inheritance
10855 : */
10856 1374 : connoinherit = rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE;
10857 : }
10858 :
10859 : /*
10860 : * Record the FK constraint in pg_constraint.
10861 : */
10862 2741 : constrOid = CreateConstraintEntry(conname,
10863 2741 : RelationGetNamespace(rel),
10864 : CONSTRAINT_FOREIGN,
10865 2741 : fkconstraint->deferrable,
10866 2741 : fkconstraint->initdeferred,
10867 2741 : fkconstraint->is_enforced,
10868 2741 : fkconstraint->initially_valid,
10869 : parentConstr,
10870 : RelationGetRelid(rel),
10871 : fkattnum,
10872 : numfks,
10873 : numfks,
10874 : InvalidOid, /* not a domain constraint */
10875 : indexOid,
10876 : RelationGetRelid(pkrel),
10877 : pkattnum,
10878 : pfeqoperators,
10879 : ppeqoperators,
10880 : ffeqoperators,
10881 : numfks,
10882 2741 : fkconstraint->fk_upd_action,
10883 2741 : fkconstraint->fk_del_action,
10884 : fkdelsetcols,
10885 : numfkdelsetcols,
10886 2741 : fkconstraint->fk_matchtype,
10887 : NULL, /* no exclusion constraint */
10888 : NULL, /* no check constraint */
10889 : NULL,
10890 : conislocal, /* islocal */
10891 : coninhcount, /* inhcount */
10892 : connoinherit, /* conNoInherit */
10893 : with_period, /* conPeriod */
10894 : is_internal); /* is_internal */
10895 :
10896 2741 : ObjectAddressSet(address, ConstraintRelationId, constrOid);
10897 :
10898 : /*
10899 : * In partitioning cases, create the dependency entries for this
10900 : * constraint. (For non-partitioned cases, relevant entries were created
10901 : * by CreateConstraintEntry.)
10902 : *
10903 : * On the referenced side, we need the constraint to have an internal
10904 : * dependency on its parent constraint; this means that this constraint
10905 : * cannot be dropped on its own -- only through the parent constraint. It
10906 : * also means the containing partition cannot be dropped on its own, but
10907 : * it can be detached, at which point this dependency is removed (after
10908 : * verifying that no rows are referenced via this FK.)
10909 : *
10910 : * When processing the referencing side, we link the constraint via the
10911 : * special partitioning dependencies: the parent constraint is the primary
10912 : * dependent, and the partition on which the foreign key exists is the
10913 : * secondary dependency. That way, this constraint is dropped if either
10914 : * of these objects is.
10915 : *
10916 : * Note that this is only necessary for the subsidiary pg_constraint rows
10917 : * in partitions; the topmost row doesn't need any of this.
10918 : */
10919 2741 : if (OidIsValid(parentConstr))
10920 : {
10921 : ObjectAddress referenced;
10922 :
10923 1367 : ObjectAddressSet(referenced, ConstraintRelationId, parentConstr);
10924 :
10925 : Assert(fkside != addFkBothSides);
10926 1367 : if (fkside == addFkReferencedSide)
10927 807 : recordDependencyOn(&address, &referenced, DEPENDENCY_INTERNAL);
10928 : else
10929 : {
10930 560 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_PRI);
10931 560 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
10932 560 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_SEC);
10933 : }
10934 : }
10935 :
10936 : /* make new constraint visible, in case we add more */
10937 2741 : CommandCounterIncrement();
10938 :
10939 2741 : return address;
10940 : }
10941 :
10942 : /*
10943 : * addFkRecurseReferenced
10944 : * Recursive helper for the referenced side of foreign key creation,
10945 : * which creates the action triggers and recurses
10946 : *
10947 : * If the referenced relation is a plain relation, create the necessary action
10948 : * triggers that implement the constraint. If the referenced relation is a
10949 : * partitioned table, then we create a pg_constraint row referencing the parent
10950 : * of the referencing side for it and recurse on this routine for each
10951 : * partition.
10952 : *
10953 : * fkconstraint: the constraint being added
10954 : * rel: the root referencing relation
10955 : * pkrel: the referenced relation; might be a partition, if recursing
10956 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10957 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10958 : * top-level constraint
10959 : * numfks: the number of columns in the foreign key
10960 : * pkattnum: the attnum array of referenced attributes
10961 : * fkattnum: the attnum array of referencing attributes
10962 : * numfkdelsetcols: the number of columns in the ON DELETE SET
10963 : * NULL/DEFAULT (...) clause
10964 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10965 : * NULL/DEFAULT clause
10966 : * pf/pp/ffeqoperators: OID array of operators between columns
10967 : * old_check_ok: true if this constraint replaces an existing one that
10968 : * was already validated (thus this one doesn't need validation)
10969 : * parentDelTrigger and parentUpdTrigger: when recursively called on a
10970 : * partition, the OIDs of the parent action triggers for DELETE and
10971 : * UPDATE respectively.
10972 : * with_period: true if this is a temporal FK
10973 : */
10974 : static void
10975 2253 : addFkRecurseReferenced(Constraint *fkconstraint, Relation rel,
10976 : Relation pkrel, Oid indexOid, Oid parentConstr,
10977 : int numfks,
10978 : int16 *pkattnum, int16 *fkattnum, Oid *pfeqoperators,
10979 : Oid *ppeqoperators, Oid *ffeqoperators,
10980 : int numfkdelsetcols, int16 *fkdelsetcols,
10981 : bool old_check_ok,
10982 : Oid parentDelTrigger, Oid parentUpdTrigger,
10983 : bool with_period)
10984 : {
10985 2253 : Oid deleteTriggerOid = InvalidOid,
10986 2253 : updateTriggerOid = InvalidOid;
10987 :
10988 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
10989 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
10990 :
10991 : /*
10992 : * Create action triggers to enforce the constraint, or skip them if the
10993 : * constraint is NOT ENFORCED.
10994 : */
10995 2253 : if (fkconstraint->is_enforced)
10996 2205 : createForeignKeyActionTriggers(RelationGetRelid(rel),
10997 : RelationGetRelid(pkrel),
10998 : fkconstraint,
10999 : parentConstr, indexOid,
11000 : parentDelTrigger, parentUpdTrigger,
11001 : &deleteTriggerOid, &updateTriggerOid);
11002 :
11003 : /*
11004 : * If the referenced table is partitioned, recurse on ourselves to handle
11005 : * each partition. We need one pg_constraint row created for each
11006 : * partition in addition to the pg_constraint row for the parent table.
11007 : */
11008 2253 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11009 : {
11010 373 : PartitionDesc pd = RelationGetPartitionDesc(pkrel, true);
11011 :
11012 1004 : for (int i = 0; i < pd->nparts; i++)
11013 : {
11014 : Relation partRel;
11015 : AttrMap *map;
11016 : AttrNumber *mapped_pkattnum;
11017 : Oid partIndexId;
11018 : ObjectAddress address;
11019 :
11020 : /* XXX would it be better to acquire these locks beforehand? */
11021 631 : partRel = table_open(pd->oids[i], ShareRowExclusiveLock);
11022 :
11023 : /*
11024 : * Map the attribute numbers in the referenced side of the FK
11025 : * definition to match the partition's column layout.
11026 : */
11027 631 : map = build_attrmap_by_name_if_req(RelationGetDescr(partRel),
11028 : RelationGetDescr(pkrel),
11029 : false);
11030 631 : if (map)
11031 : {
11032 89 : mapped_pkattnum = palloc_array(AttrNumber, numfks);
11033 186 : for (int j = 0; j < numfks; j++)
11034 97 : mapped_pkattnum[j] = map->attnums[pkattnum[j] - 1];
11035 : }
11036 : else
11037 542 : mapped_pkattnum = pkattnum;
11038 :
11039 : /* Determine the index to use at this level */
11040 631 : partIndexId = index_get_partition(partRel, indexOid);
11041 631 : if (!OidIsValid(partIndexId))
11042 0 : elog(ERROR, "index for %u not found in partition %s",
11043 : indexOid, RelationGetRelationName(partRel));
11044 :
11045 : /* Create entry at this level ... */
11046 631 : address = addFkConstraint(addFkReferencedSide,
11047 : fkconstraint->conname, fkconstraint, rel,
11048 : partRel, partIndexId, parentConstr,
11049 : numfks, mapped_pkattnum,
11050 : fkattnum, pfeqoperators, ppeqoperators,
11051 : ffeqoperators, numfkdelsetcols,
11052 : fkdelsetcols, true, with_period);
11053 : /* ... and recurse to our children */
11054 631 : addFkRecurseReferenced(fkconstraint, rel, partRel,
11055 : partIndexId, address.objectId, numfks,
11056 : mapped_pkattnum, fkattnum,
11057 : pfeqoperators, ppeqoperators, ffeqoperators,
11058 : numfkdelsetcols, fkdelsetcols,
11059 : old_check_ok,
11060 : deleteTriggerOid, updateTriggerOid,
11061 : with_period);
11062 :
11063 : /* Done -- clean up (but keep the lock) */
11064 631 : table_close(partRel, NoLock);
11065 631 : if (map)
11066 : {
11067 89 : pfree(mapped_pkattnum);
11068 89 : free_attrmap(map);
11069 : }
11070 : }
11071 : }
11072 2253 : }
11073 :
11074 : /*
11075 : * addFkRecurseReferencing
11076 : * Recursive helper for the referencing side of foreign key creation,
11077 : * which creates the check triggers and recurses
11078 : *
11079 : * If the referencing relation is a plain relation, create the necessary check
11080 : * triggers that implement the constraint, and set up for Phase 3 constraint
11081 : * verification. If the referencing relation is a partitioned table, then
11082 : * we create a pg_constraint row for it and recurse on this routine for each
11083 : * partition.
11084 : *
11085 : * We assume that the referenced relation is locked against concurrent
11086 : * deletions. If it's a partitioned relation, every partition must be so
11087 : * locked.
11088 : *
11089 : * wqueue: the ALTER TABLE work queue; NULL when not running as part
11090 : * of an ALTER TABLE sequence.
11091 : * fkconstraint: the constraint being added
11092 : * rel: the referencing relation; might be a partition, if recursing
11093 : * pkrel: the root referenced relation
11094 : * indexOid: the OID of the index (on pkrel) implementing this constraint
11095 : * parentConstr: the OID of the parent constraint (there is always one)
11096 : * numfks: the number of columns in the foreign key
11097 : * pkattnum: the attnum array of referenced attributes
11098 : * fkattnum: the attnum array of referencing attributes
11099 : * pf/pp/ffeqoperators: OID array of operators between columns
11100 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
11101 : * (...) clause
11102 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
11103 : * NULL/DEFAULT clause
11104 : * old_check_ok: true if this constraint replaces an existing one that
11105 : * was already validated (thus this one doesn't need validation)
11106 : * lockmode: the lockmode to acquire on partitions when recursing
11107 : * parentInsTrigger and parentUpdTrigger: when being recursively called on
11108 : * a partition, the OIDs of the parent check triggers for INSERT and
11109 : * UPDATE respectively.
11110 : * with_period: true if this is a temporal FK
11111 : */
11112 : static void
11113 1934 : addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint, Relation rel,
11114 : Relation pkrel, Oid indexOid, Oid parentConstr,
11115 : int numfks, int16 *pkattnum, int16 *fkattnum,
11116 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
11117 : int numfkdelsetcols, int16 *fkdelsetcols,
11118 : bool old_check_ok, LOCKMODE lockmode,
11119 : Oid parentInsTrigger, Oid parentUpdTrigger,
11120 : bool with_period)
11121 : {
11122 1934 : Oid insertTriggerOid = InvalidOid,
11123 1934 : updateTriggerOid = InvalidOid;
11124 :
11125 : Assert(OidIsValid(parentConstr));
11126 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
11127 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
11128 :
11129 1934 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11130 0 : ereport(ERROR,
11131 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11132 : errmsg("foreign key constraints are not supported on foreign tables")));
11133 :
11134 : /*
11135 : * Add check triggers if the constraint is ENFORCED, and if needed,
11136 : * schedule them to be checked in Phase 3.
11137 : *
11138 : * If the relation is partitioned, drill down to do it to its partitions.
11139 : */
11140 1934 : if (fkconstraint->is_enforced)
11141 1902 : createForeignKeyCheckTriggers(RelationGetRelid(rel),
11142 : RelationGetRelid(pkrel),
11143 : fkconstraint,
11144 : parentConstr,
11145 : indexOid,
11146 : parentInsTrigger, parentUpdTrigger,
11147 : &insertTriggerOid, &updateTriggerOid);
11148 :
11149 1934 : if (rel->rd_rel->relkind == RELKIND_RELATION)
11150 : {
11151 : /*
11152 : * Tell Phase 3 to check that the constraint is satisfied by existing
11153 : * rows. We can skip this during table creation, when constraint is
11154 : * specified as NOT ENFORCED, or when requested explicitly by
11155 : * specifying NOT VALID in an ADD FOREIGN KEY command, and when we're
11156 : * recreating a constraint following a SET DATA TYPE operation that
11157 : * did not impugn its validity.
11158 : */
11159 1611 : if (wqueue && !old_check_ok && !fkconstraint->skip_validation &&
11160 509 : fkconstraint->is_enforced)
11161 : {
11162 : NewConstraint *newcon;
11163 : AlteredTableInfo *tab;
11164 :
11165 509 : tab = ATGetQueueEntry(wqueue, rel);
11166 :
11167 509 : newcon = palloc0_object(NewConstraint);
11168 509 : newcon->name = get_constraint_name(parentConstr);
11169 509 : newcon->contype = CONSTR_FOREIGN;
11170 509 : newcon->refrelid = RelationGetRelid(pkrel);
11171 509 : newcon->refindid = indexOid;
11172 509 : newcon->conid = parentConstr;
11173 509 : newcon->conwithperiod = fkconstraint->fk_with_period;
11174 509 : newcon->qual = (Node *) fkconstraint;
11175 :
11176 509 : tab->constraints = lappend(tab->constraints, newcon);
11177 : }
11178 : }
11179 323 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11180 : {
11181 323 : PartitionDesc pd = RelationGetPartitionDesc(rel, true);
11182 : Relation trigrel;
11183 :
11184 : /*
11185 : * Triggers of the foreign keys will be manipulated a bunch of times
11186 : * in the loop below. To avoid repeatedly opening/closing the trigger
11187 : * catalog relation, we open it here and pass it to the subroutines
11188 : * called below.
11189 : */
11190 323 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11191 :
11192 : /*
11193 : * Recurse to take appropriate action on each partition; either we
11194 : * find an existing constraint to reparent to ours, or we create a new
11195 : * one.
11196 : */
11197 572 : for (int i = 0; i < pd->nparts; i++)
11198 : {
11199 253 : Relation partition = table_open(pd->oids[i], lockmode);
11200 : List *partFKs;
11201 : AttrMap *attmap;
11202 : AttrNumber mapped_fkattnum[INDEX_MAX_KEYS];
11203 : bool attached;
11204 : ObjectAddress address;
11205 :
11206 253 : CheckAlterTableIsSafe(partition);
11207 :
11208 249 : attmap = build_attrmap_by_name(RelationGetDescr(partition),
11209 : RelationGetDescr(rel),
11210 : false);
11211 642 : for (int j = 0; j < numfks; j++)
11212 393 : mapped_fkattnum[j] = attmap->attnums[fkattnum[j] - 1];
11213 :
11214 : /* Check whether an existing constraint can be repurposed */
11215 249 : partFKs = copyObject(RelationGetFKeyList(partition));
11216 249 : attached = false;
11217 509 : foreach_node(ForeignKeyCacheInfo, fk, partFKs)
11218 : {
11219 19 : if (tryAttachPartitionForeignKey(wqueue,
11220 : fk,
11221 : partition,
11222 : parentConstr,
11223 : numfks,
11224 : mapped_fkattnum,
11225 : pkattnum,
11226 : pfeqoperators,
11227 : insertTriggerOid,
11228 : updateTriggerOid,
11229 : trigrel))
11230 : {
11231 8 : attached = true;
11232 8 : break;
11233 : }
11234 : }
11235 249 : if (attached)
11236 : {
11237 8 : table_close(partition, NoLock);
11238 8 : continue;
11239 : }
11240 :
11241 : /*
11242 : * No luck finding a good constraint to reuse; create our own.
11243 : */
11244 241 : address = addFkConstraint(addFkReferencingSide,
11245 : fkconstraint->conname, fkconstraint,
11246 : partition, pkrel, indexOid, parentConstr,
11247 : numfks, pkattnum,
11248 : mapped_fkattnum, pfeqoperators,
11249 : ppeqoperators, ffeqoperators,
11250 : numfkdelsetcols, fkdelsetcols, true,
11251 : with_period);
11252 :
11253 : /* call ourselves to finalize the creation and we're done */
11254 241 : addFkRecurseReferencing(wqueue, fkconstraint, partition, pkrel,
11255 : indexOid,
11256 : address.objectId,
11257 : numfks,
11258 : pkattnum,
11259 : mapped_fkattnum,
11260 : pfeqoperators,
11261 : ppeqoperators,
11262 : ffeqoperators,
11263 : numfkdelsetcols,
11264 : fkdelsetcols,
11265 : old_check_ok,
11266 : lockmode,
11267 : insertTriggerOid,
11268 : updateTriggerOid,
11269 : with_period);
11270 :
11271 241 : table_close(partition, NoLock);
11272 : }
11273 :
11274 319 : table_close(trigrel, RowExclusiveLock);
11275 : }
11276 1930 : }
11277 :
11278 : /*
11279 : * CloneForeignKeyConstraints
11280 : * Clone foreign keys from a partitioned table to a newly acquired
11281 : * partition.
11282 : *
11283 : * partitionRel is a partition of parentRel, so we can be certain that it has
11284 : * the same columns with the same datatypes. The columns may be in different
11285 : * order, though.
11286 : *
11287 : * wqueue must be passed to set up phase 3 constraint checking, unless the
11288 : * referencing-side partition is known to be empty (such as in CREATE TABLE /
11289 : * PARTITION OF).
11290 : */
11291 : static void
11292 7641 : CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
11293 : Relation partitionRel)
11294 : {
11295 : /* This only works for declarative partitioning */
11296 : Assert(parentRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
11297 :
11298 : /*
11299 : * First, clone constraints where the parent is on the referencing side.
11300 : */
11301 7641 : CloneFkReferencing(wqueue, parentRel, partitionRel);
11302 :
11303 : /*
11304 : * Clone constraints for which the parent is on the referenced side.
11305 : */
11306 7629 : CloneFkReferenced(parentRel, partitionRel);
11307 7629 : }
11308 :
11309 : /*
11310 : * CloneFkReferenced
11311 : * Subroutine for CloneForeignKeyConstraints
11312 : *
11313 : * Find all the FKs that have the parent relation on the referenced side;
11314 : * clone those constraints to the given partition. This is to be called
11315 : * when the partition is being created or attached.
11316 : *
11317 : * This recurses to partitions, if the relation being attached is partitioned.
11318 : * Recursion is done by calling addFkRecurseReferenced.
11319 : */
11320 : static void
11321 7629 : CloneFkReferenced(Relation parentRel, Relation partitionRel)
11322 : {
11323 : Relation pg_constraint;
11324 : AttrMap *attmap;
11325 : ListCell *cell;
11326 : SysScanDesc scan;
11327 : ScanKeyData key[2];
11328 : HeapTuple tuple;
11329 7629 : List *clone = NIL;
11330 : Relation trigrel;
11331 :
11332 : /*
11333 : * Search for any constraints where this partition's parent is in the
11334 : * referenced side. However, we must not clone any constraint whose
11335 : * parent constraint is also going to be cloned, to avoid duplicates. So
11336 : * do it in two steps: first construct the list of constraints to clone,
11337 : * then go over that list cloning those whose parents are not in the list.
11338 : * (We must not rely on the parent being seen first, since the catalog
11339 : * scan could return children first.)
11340 : */
11341 7629 : pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11342 7629 : ScanKeyInit(&key[0],
11343 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
11344 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parentRel)));
11345 7629 : ScanKeyInit(&key[1],
11346 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
11347 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
11348 : /* This is a seqscan, as we don't have a usable index ... */
11349 7629 : scan = systable_beginscan(pg_constraint, InvalidOid, true,
11350 : NULL, 2, key);
11351 7953 : while ((tuple = systable_getnext(scan)) != NULL)
11352 : {
11353 324 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11354 :
11355 324 : clone = lappend_oid(clone, constrForm->oid);
11356 : }
11357 7629 : systable_endscan(scan);
11358 7629 : table_close(pg_constraint, RowShareLock);
11359 :
11360 : /*
11361 : * Triggers of the foreign keys will be manipulated a bunch of times in
11362 : * the loop below. To avoid repeatedly opening/closing the trigger
11363 : * catalog relation, we open it here and pass it to the subroutines called
11364 : * below.
11365 : */
11366 7629 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11367 :
11368 7629 : attmap = build_attrmap_by_name(RelationGetDescr(partitionRel),
11369 : RelationGetDescr(parentRel),
11370 : false);
11371 7953 : foreach(cell, clone)
11372 : {
11373 324 : Oid constrOid = lfirst_oid(cell);
11374 : Form_pg_constraint constrForm;
11375 : Relation fkRel;
11376 : Oid indexOid;
11377 : Oid partIndexId;
11378 : int numfks;
11379 : AttrNumber conkey[INDEX_MAX_KEYS];
11380 : AttrNumber mapped_confkey[INDEX_MAX_KEYS];
11381 : AttrNumber confkey[INDEX_MAX_KEYS];
11382 : Oid conpfeqop[INDEX_MAX_KEYS];
11383 : Oid conppeqop[INDEX_MAX_KEYS];
11384 : Oid conffeqop[INDEX_MAX_KEYS];
11385 : int numfkdelsetcols;
11386 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11387 : Constraint *fkconstraint;
11388 : ObjectAddress address;
11389 324 : Oid deleteTriggerOid = InvalidOid,
11390 324 : updateTriggerOid = InvalidOid;
11391 :
11392 324 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
11393 324 : if (!HeapTupleIsValid(tuple))
11394 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
11395 324 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11396 :
11397 : /*
11398 : * As explained above: don't try to clone a constraint for which we're
11399 : * going to clone the parent.
11400 : */
11401 324 : if (list_member_oid(clone, constrForm->conparentid))
11402 : {
11403 148 : ReleaseSysCache(tuple);
11404 148 : continue;
11405 : }
11406 :
11407 : /* We need the same lock level that CreateTrigger will acquire */
11408 176 : fkRel = table_open(constrForm->conrelid, ShareRowExclusiveLock);
11409 :
11410 176 : indexOid = constrForm->conindid;
11411 176 : DeconstructFkConstraintRow(tuple,
11412 : &numfks,
11413 : conkey,
11414 : confkey,
11415 : conpfeqop,
11416 : conppeqop,
11417 : conffeqop,
11418 : &numfkdelsetcols,
11419 : confdelsetcols);
11420 :
11421 380 : for (int i = 0; i < numfks; i++)
11422 204 : mapped_confkey[i] = attmap->attnums[confkey[i] - 1];
11423 :
11424 176 : fkconstraint = makeNode(Constraint);
11425 176 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11426 176 : fkconstraint->conname = NameStr(constrForm->conname);
11427 176 : fkconstraint->deferrable = constrForm->condeferrable;
11428 176 : fkconstraint->initdeferred = constrForm->condeferred;
11429 176 : fkconstraint->location = -1;
11430 176 : fkconstraint->pktable = NULL;
11431 : /* ->fk_attrs determined below */
11432 176 : fkconstraint->pk_attrs = NIL;
11433 176 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11434 176 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11435 176 : fkconstraint->fk_del_action = constrForm->confdeltype;
11436 176 : fkconstraint->fk_del_set_cols = NIL;
11437 176 : fkconstraint->old_conpfeqop = NIL;
11438 176 : fkconstraint->old_pktable_oid = InvalidOid;
11439 176 : fkconstraint->is_enforced = constrForm->conenforced;
11440 176 : fkconstraint->skip_validation = false;
11441 176 : fkconstraint->initially_valid = constrForm->convalidated;
11442 :
11443 : /* set up colnames that are used to generate the constraint name */
11444 380 : for (int i = 0; i < numfks; i++)
11445 : {
11446 : Form_pg_attribute att;
11447 :
11448 204 : att = TupleDescAttr(RelationGetDescr(fkRel),
11449 204 : conkey[i] - 1);
11450 204 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11451 204 : makeString(NameStr(att->attname)));
11452 : }
11453 :
11454 : /*
11455 : * Add the new foreign key constraint pointing to the new partition.
11456 : * Because this new partition appears in the referenced side of the
11457 : * constraint, we don't need to set up for Phase 3 check.
11458 : */
11459 176 : partIndexId = index_get_partition(partitionRel, indexOid);
11460 176 : if (!OidIsValid(partIndexId))
11461 0 : elog(ERROR, "index for %u not found in partition %s",
11462 : indexOid, RelationGetRelationName(partitionRel));
11463 :
11464 : /*
11465 : * Get the "action" triggers belonging to the constraint to pass as
11466 : * parent OIDs for similar triggers that will be created on the
11467 : * partition in addFkRecurseReferenced().
11468 : */
11469 176 : if (constrForm->conenforced)
11470 172 : GetForeignKeyActionTriggers(trigrel, constrOid,
11471 : constrForm->confrelid, constrForm->conrelid,
11472 : &deleteTriggerOid, &updateTriggerOid);
11473 :
11474 : /* Add this constraint ... */
11475 176 : address = addFkConstraint(addFkReferencedSide,
11476 : fkconstraint->conname, fkconstraint, fkRel,
11477 : partitionRel, partIndexId, constrOid,
11478 : numfks, mapped_confkey,
11479 : conkey, conpfeqop, conppeqop, conffeqop,
11480 : numfkdelsetcols, confdelsetcols, false,
11481 176 : constrForm->conperiod);
11482 : /* ... and recurse */
11483 176 : addFkRecurseReferenced(fkconstraint,
11484 : fkRel,
11485 : partitionRel,
11486 : partIndexId,
11487 : address.objectId,
11488 : numfks,
11489 : mapped_confkey,
11490 : conkey,
11491 : conpfeqop,
11492 : conppeqop,
11493 : conffeqop,
11494 : numfkdelsetcols,
11495 : confdelsetcols,
11496 : true,
11497 : deleteTriggerOid,
11498 : updateTriggerOid,
11499 176 : constrForm->conperiod);
11500 :
11501 176 : table_close(fkRel, NoLock);
11502 176 : ReleaseSysCache(tuple);
11503 : }
11504 :
11505 7629 : table_close(trigrel, RowExclusiveLock);
11506 7629 : }
11507 :
11508 : /*
11509 : * CloneFkReferencing
11510 : * Subroutine for CloneForeignKeyConstraints
11511 : *
11512 : * For each FK constraint of the parent relation in the given list, find an
11513 : * equivalent constraint in its partition relation that can be reparented;
11514 : * if one cannot be found, create a new constraint in the partition as its
11515 : * child.
11516 : *
11517 : * If wqueue is given, it is used to set up phase-3 verification for each
11518 : * cloned constraint; omit it if such verification is not needed
11519 : * (example: the partition is being created anew).
11520 : */
11521 : static void
11522 7641 : CloneFkReferencing(List **wqueue, Relation parentRel, Relation partRel)
11523 : {
11524 : AttrMap *attmap;
11525 : List *partFKs;
11526 7641 : List *clone = NIL;
11527 : ListCell *cell;
11528 : Relation trigrel;
11529 :
11530 : /* obtain a list of constraints that we need to clone */
11531 8572 : foreach(cell, RelationGetFKeyList(parentRel))
11532 : {
11533 935 : ForeignKeyCacheInfo *fk = lfirst(cell);
11534 :
11535 : /*
11536 : * Refuse to attach a table as partition that this partitioned table
11537 : * already has a foreign key to. This isn't useful schema, which is
11538 : * proven by the fact that there have been no user complaints that
11539 : * it's already impossible to achieve this in the opposite direction,
11540 : * i.e., creating a foreign key that references a partition. This
11541 : * restriction allows us to dodge some complexities around
11542 : * pg_constraint and pg_trigger row creations that would be needed
11543 : * during ATTACH/DETACH for this kind of relationship.
11544 : */
11545 935 : if (fk->confrelid == RelationGetRelid(partRel))
11546 4 : ereport(ERROR,
11547 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
11548 : errmsg("cannot attach table \"%s\" as a partition because it is referenced by foreign key \"%s\"",
11549 : RelationGetRelationName(partRel),
11550 : get_constraint_name(fk->conoid))));
11551 :
11552 931 : clone = lappend_oid(clone, fk->conoid);
11553 : }
11554 :
11555 : /*
11556 : * Silently do nothing if there's nothing to do. In particular, this
11557 : * avoids throwing a spurious error for foreign tables.
11558 : */
11559 7637 : if (clone == NIL)
11560 7246 : return;
11561 :
11562 391 : if (partRel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11563 0 : ereport(ERROR,
11564 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11565 : errmsg("foreign key constraints are not supported on foreign tables")));
11566 :
11567 : /*
11568 : * Triggers of the foreign keys will be manipulated a bunch of times in
11569 : * the loop below. To avoid repeatedly opening/closing the trigger
11570 : * catalog relation, we open it here and pass it to the subroutines called
11571 : * below.
11572 : */
11573 391 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11574 :
11575 : /*
11576 : * The constraint key may differ, if the columns in the partition are
11577 : * different. This map is used to convert them.
11578 : */
11579 391 : attmap = build_attrmap_by_name(RelationGetDescr(partRel),
11580 : RelationGetDescr(parentRel),
11581 : false);
11582 :
11583 391 : partFKs = copyObject(RelationGetFKeyList(partRel));
11584 :
11585 1314 : foreach(cell, clone)
11586 : {
11587 931 : Oid parentConstrOid = lfirst_oid(cell);
11588 : Form_pg_constraint constrForm;
11589 : Relation pkrel;
11590 : HeapTuple tuple;
11591 : int numfks;
11592 : AttrNumber conkey[INDEX_MAX_KEYS];
11593 : AttrNumber mapped_conkey[INDEX_MAX_KEYS];
11594 : AttrNumber confkey[INDEX_MAX_KEYS];
11595 : Oid conpfeqop[INDEX_MAX_KEYS];
11596 : Oid conppeqop[INDEX_MAX_KEYS];
11597 : Oid conffeqop[INDEX_MAX_KEYS];
11598 : int numfkdelsetcols;
11599 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11600 : Constraint *fkconstraint;
11601 : bool attached;
11602 : Oid indexOid;
11603 : ObjectAddress address;
11604 : ListCell *lc;
11605 931 : Oid insertTriggerOid = InvalidOid,
11606 931 : updateTriggerOid = InvalidOid;
11607 : bool with_period;
11608 :
11609 931 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parentConstrOid));
11610 931 : if (!HeapTupleIsValid(tuple))
11611 0 : elog(ERROR, "cache lookup failed for constraint %u",
11612 : parentConstrOid);
11613 931 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11614 :
11615 : /* Don't clone constraints whose parents are being cloned */
11616 931 : if (list_member_oid(clone, constrForm->conparentid))
11617 : {
11618 508 : ReleaseSysCache(tuple);
11619 608 : continue;
11620 : }
11621 :
11622 : /*
11623 : * Need to prevent concurrent deletions. If pkrel is a partitioned
11624 : * relation, that means to lock all partitions.
11625 : */
11626 423 : pkrel = table_open(constrForm->confrelid, ShareRowExclusiveLock);
11627 423 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11628 176 : (void) find_all_inheritors(RelationGetRelid(pkrel),
11629 : ShareRowExclusiveLock, NULL);
11630 :
11631 423 : DeconstructFkConstraintRow(tuple, &numfks, conkey, confkey,
11632 : conpfeqop, conppeqop, conffeqop,
11633 : &numfkdelsetcols, confdelsetcols);
11634 1002 : for (int i = 0; i < numfks; i++)
11635 579 : mapped_conkey[i] = attmap->attnums[conkey[i] - 1];
11636 :
11637 : /*
11638 : * Get the "check" triggers belonging to the constraint, if it is
11639 : * ENFORCED, to pass as parent OIDs for similar triggers that will be
11640 : * created on the partition in addFkRecurseReferencing(). They are
11641 : * also passed to tryAttachPartitionForeignKey() below to simply
11642 : * assign as parents to the partition's existing "check" triggers,
11643 : * that is, if the corresponding constraints is deemed attachable to
11644 : * the parent constraint.
11645 : */
11646 423 : if (constrForm->conenforced)
11647 415 : GetForeignKeyCheckTriggers(trigrel, constrForm->oid,
11648 : constrForm->confrelid, constrForm->conrelid,
11649 : &insertTriggerOid, &updateTriggerOid);
11650 :
11651 : /*
11652 : * Before creating a new constraint, see whether any existing FKs are
11653 : * fit for the purpose. If one is, attach the parent constraint to
11654 : * it, and don't clone anything. This way we avoid the expensive
11655 : * verification step and don't end up with a duplicate FK, and we
11656 : * don't need to recurse to partitions for this constraint.
11657 : */
11658 423 : attached = false;
11659 483 : foreach(lc, partFKs)
11660 : {
11661 164 : ForeignKeyCacheInfo *fk = lfirst_node(ForeignKeyCacheInfo, lc);
11662 :
11663 164 : if (tryAttachPartitionForeignKey(wqueue,
11664 : fk,
11665 : partRel,
11666 : parentConstrOid,
11667 : numfks,
11668 : mapped_conkey,
11669 : confkey,
11670 : conpfeqop,
11671 : insertTriggerOid,
11672 : updateTriggerOid,
11673 : trigrel))
11674 : {
11675 100 : attached = true;
11676 100 : table_close(pkrel, NoLock);
11677 100 : break;
11678 : }
11679 : }
11680 419 : if (attached)
11681 : {
11682 100 : ReleaseSysCache(tuple);
11683 100 : continue;
11684 : }
11685 :
11686 : /* No dice. Set up to create our own constraint */
11687 319 : fkconstraint = makeNode(Constraint);
11688 319 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11689 : /* ->conname determined below */
11690 319 : fkconstraint->deferrable = constrForm->condeferrable;
11691 319 : fkconstraint->initdeferred = constrForm->condeferred;
11692 319 : fkconstraint->location = -1;
11693 319 : fkconstraint->pktable = NULL;
11694 : /* ->fk_attrs determined below */
11695 319 : fkconstraint->pk_attrs = NIL;
11696 319 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11697 319 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11698 319 : fkconstraint->fk_del_action = constrForm->confdeltype;
11699 319 : fkconstraint->fk_del_set_cols = NIL;
11700 319 : fkconstraint->old_conpfeqop = NIL;
11701 319 : fkconstraint->old_pktable_oid = InvalidOid;
11702 319 : fkconstraint->is_enforced = constrForm->conenforced;
11703 319 : fkconstraint->skip_validation = false;
11704 319 : fkconstraint->initially_valid = constrForm->convalidated;
11705 718 : for (int i = 0; i < numfks; i++)
11706 : {
11707 : Form_pg_attribute att;
11708 :
11709 399 : att = TupleDescAttr(RelationGetDescr(partRel),
11710 399 : mapped_conkey[i] - 1);
11711 399 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11712 399 : makeString(NameStr(att->attname)));
11713 : }
11714 :
11715 319 : indexOid = constrForm->conindid;
11716 319 : with_period = constrForm->conperiod;
11717 :
11718 : /* Create the pg_constraint entry at this level */
11719 319 : address = addFkConstraint(addFkReferencingSide,
11720 319 : NameStr(constrForm->conname), fkconstraint,
11721 : partRel, pkrel, indexOid, parentConstrOid,
11722 : numfks, confkey,
11723 : mapped_conkey, conpfeqop,
11724 : conppeqop, conffeqop,
11725 : numfkdelsetcols, confdelsetcols,
11726 : false, with_period);
11727 :
11728 : /* Done with the cloned constraint's tuple */
11729 319 : ReleaseSysCache(tuple);
11730 :
11731 : /* Create the check triggers, and recurse to partitions, if any */
11732 319 : addFkRecurseReferencing(wqueue,
11733 : fkconstraint,
11734 : partRel,
11735 : pkrel,
11736 : indexOid,
11737 : address.objectId,
11738 : numfks,
11739 : confkey,
11740 : mapped_conkey,
11741 : conpfeqop,
11742 : conppeqop,
11743 : conffeqop,
11744 : numfkdelsetcols,
11745 : confdelsetcols,
11746 : false, /* no old check exists */
11747 : AccessExclusiveLock,
11748 : insertTriggerOid,
11749 : updateTriggerOid,
11750 : with_period);
11751 315 : table_close(pkrel, NoLock);
11752 : }
11753 :
11754 383 : table_close(trigrel, RowExclusiveLock);
11755 : }
11756 :
11757 : /*
11758 : * When the parent of a partition receives [the referencing side of] a foreign
11759 : * key, we must propagate that foreign key to the partition. However, the
11760 : * partition might already have an equivalent foreign key; this routine
11761 : * compares the given ForeignKeyCacheInfo (in the partition) to the FK defined
11762 : * by the other parameters. If they are equivalent, create the link between
11763 : * the two constraints and return true.
11764 : *
11765 : * If the given FK does not match the one defined by rest of the params,
11766 : * return false.
11767 : */
11768 : static bool
11769 183 : tryAttachPartitionForeignKey(List **wqueue,
11770 : ForeignKeyCacheInfo *fk,
11771 : Relation partition,
11772 : Oid parentConstrOid,
11773 : int numfks,
11774 : AttrNumber *mapped_conkey,
11775 : AttrNumber *confkey,
11776 : Oid *conpfeqop,
11777 : Oid parentInsTrigger,
11778 : Oid parentUpdTrigger,
11779 : Relation trigrel)
11780 : {
11781 : HeapTuple parentConstrTup;
11782 : Form_pg_constraint parentConstr;
11783 : HeapTuple partcontup;
11784 : Form_pg_constraint partConstr;
11785 :
11786 183 : parentConstrTup = SearchSysCache1(CONSTROID,
11787 : ObjectIdGetDatum(parentConstrOid));
11788 183 : if (!HeapTupleIsValid(parentConstrTup))
11789 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11790 183 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11791 :
11792 : /*
11793 : * Do some quick & easy initial checks. If any of these fail, we cannot
11794 : * use this constraint.
11795 : */
11796 183 : if (fk->confrelid != parentConstr->confrelid || fk->nkeys != numfks)
11797 : {
11798 0 : ReleaseSysCache(parentConstrTup);
11799 0 : return false;
11800 : }
11801 505 : for (int i = 0; i < numfks; i++)
11802 : {
11803 324 : if (fk->conkey[i] != mapped_conkey[i] ||
11804 322 : fk->confkey[i] != confkey[i] ||
11805 322 : fk->conpfeqop[i] != conpfeqop[i])
11806 : {
11807 2 : ReleaseSysCache(parentConstrTup);
11808 2 : return false;
11809 : }
11810 : }
11811 :
11812 : /* Looks good so far; perform more extensive checks. */
11813 181 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
11814 181 : if (!HeapTupleIsValid(partcontup))
11815 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
11816 181 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11817 :
11818 : /*
11819 : * An error should be raised if the constraint enforceability is
11820 : * different. Returning false without raising an error, as we do for other
11821 : * attributes, could lead to a duplicate constraint with the same
11822 : * enforceability as the parent. While this may be acceptable, it may not
11823 : * be ideal. Therefore, it's better to raise an error and allow the user
11824 : * to correct the enforceability before proceeding.
11825 : */
11826 181 : if (partConstr->conenforced != parentConstr->conenforced)
11827 4 : ereport(ERROR,
11828 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
11829 : errmsg("constraint \"%s\" enforceability conflicts with constraint \"%s\" on relation \"%s\"",
11830 : NameStr(parentConstr->conname),
11831 : NameStr(partConstr->conname),
11832 : RelationGetRelationName(partition))));
11833 :
11834 177 : if (OidIsValid(partConstr->conparentid) ||
11835 158 : partConstr->condeferrable != parentConstr->condeferrable ||
11836 140 : partConstr->condeferred != parentConstr->condeferred ||
11837 140 : partConstr->confupdtype != parentConstr->confupdtype ||
11838 117 : partConstr->confdeltype != parentConstr->confdeltype ||
11839 117 : partConstr->confmatchtype != parentConstr->confmatchtype)
11840 : {
11841 69 : ReleaseSysCache(parentConstrTup);
11842 69 : ReleaseSysCache(partcontup);
11843 69 : return false;
11844 : }
11845 :
11846 108 : ReleaseSysCache(parentConstrTup);
11847 108 : ReleaseSysCache(partcontup);
11848 :
11849 : /* Looks good! Attach this constraint. */
11850 108 : AttachPartitionForeignKey(wqueue, partition, fk->conoid,
11851 : parentConstrOid, parentInsTrigger,
11852 : parentUpdTrigger, trigrel);
11853 :
11854 108 : return true;
11855 : }
11856 :
11857 : /*
11858 : * AttachPartitionForeignKey
11859 : *
11860 : * The subroutine for tryAttachPartitionForeignKey performs the final tasks of
11861 : * attaching the constraint, removing redundant triggers and entries from
11862 : * pg_constraint, and setting the constraint's parent.
11863 : */
11864 : static void
11865 108 : AttachPartitionForeignKey(List **wqueue,
11866 : Relation partition,
11867 : Oid partConstrOid,
11868 : Oid parentConstrOid,
11869 : Oid parentInsTrigger,
11870 : Oid parentUpdTrigger,
11871 : Relation trigrel)
11872 : {
11873 : HeapTuple parentConstrTup;
11874 : Form_pg_constraint parentConstr;
11875 : HeapTuple partcontup;
11876 : Form_pg_constraint partConstr;
11877 : bool queueValidation;
11878 : Oid partConstrFrelid;
11879 : Oid partConstrRelid;
11880 : bool parentConstrIsEnforced;
11881 :
11882 : /* Fetch the parent constraint tuple */
11883 108 : parentConstrTup = SearchSysCache1(CONSTROID,
11884 : ObjectIdGetDatum(parentConstrOid));
11885 108 : if (!HeapTupleIsValid(parentConstrTup))
11886 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11887 108 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11888 108 : parentConstrIsEnforced = parentConstr->conenforced;
11889 :
11890 : /* Fetch the child constraint tuple */
11891 108 : partcontup = SearchSysCache1(CONSTROID,
11892 : ObjectIdGetDatum(partConstrOid));
11893 108 : if (!HeapTupleIsValid(partcontup))
11894 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11895 108 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11896 108 : partConstrFrelid = partConstr->confrelid;
11897 108 : partConstrRelid = partConstr->conrelid;
11898 :
11899 : /*
11900 : * If the referenced table is partitioned, then the partition we're
11901 : * attaching now has extra pg_constraint rows and action triggers that are
11902 : * no longer needed. Remove those.
11903 : */
11904 108 : if (get_rel_relkind(partConstrFrelid) == RELKIND_PARTITIONED_TABLE)
11905 : {
11906 24 : Relation pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11907 :
11908 24 : RemoveInheritedConstraint(pg_constraint, trigrel, partConstrOid,
11909 : partConstrRelid);
11910 :
11911 24 : table_close(pg_constraint, RowShareLock);
11912 : }
11913 :
11914 : /*
11915 : * Will we need to validate this constraint? A valid parent constraint
11916 : * implies that all child constraints have been validated, so if this one
11917 : * isn't, we must trigger phase 3 validation.
11918 : */
11919 108 : queueValidation = parentConstr->convalidated && !partConstr->convalidated;
11920 :
11921 108 : ReleaseSysCache(partcontup);
11922 108 : ReleaseSysCache(parentConstrTup);
11923 :
11924 : /*
11925 : * The action triggers in the new partition become redundant -- the parent
11926 : * table already has equivalent ones, and those will be able to reach the
11927 : * partition. Remove the ones in the partition. We identify them because
11928 : * they have our constraint OID, as well as being on the referenced rel.
11929 : */
11930 108 : DropForeignKeyConstraintTriggers(trigrel, partConstrOid, partConstrFrelid,
11931 : partConstrRelid);
11932 :
11933 108 : ConstraintSetParentConstraint(partConstrOid, parentConstrOid,
11934 : RelationGetRelid(partition));
11935 :
11936 : /*
11937 : * Like the constraint, attach partition's "check" triggers to the
11938 : * corresponding parent triggers if the constraint is ENFORCED. NOT
11939 : * ENFORCED constraints do not have these triggers.
11940 : */
11941 108 : if (parentConstrIsEnforced)
11942 : {
11943 : Oid insertTriggerOid,
11944 : updateTriggerOid;
11945 :
11946 100 : GetForeignKeyCheckTriggers(trigrel,
11947 : partConstrOid, partConstrFrelid, partConstrRelid,
11948 : &insertTriggerOid, &updateTriggerOid);
11949 : Assert(OidIsValid(insertTriggerOid) && OidIsValid(parentInsTrigger));
11950 100 : TriggerSetParentTrigger(trigrel, insertTriggerOid, parentInsTrigger,
11951 : RelationGetRelid(partition));
11952 : Assert(OidIsValid(updateTriggerOid) && OidIsValid(parentUpdTrigger));
11953 100 : TriggerSetParentTrigger(trigrel, updateTriggerOid, parentUpdTrigger,
11954 : RelationGetRelid(partition));
11955 : }
11956 :
11957 : /*
11958 : * We updated this pg_constraint row above to set its parent; validating
11959 : * it will cause its convalidated flag to change, so we need CCI here. In
11960 : * addition, we need it unconditionally for the rare case where the parent
11961 : * table has *two* identical constraints; when reaching this function for
11962 : * the second one, we must have made our changes visible, otherwise we
11963 : * would try to attach both to this one.
11964 : */
11965 108 : CommandCounterIncrement();
11966 :
11967 : /* If validation is needed, put it in the queue now. */
11968 108 : if (queueValidation)
11969 : {
11970 : Relation conrel;
11971 : Oid confrelid;
11972 :
11973 12 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
11974 :
11975 12 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(partConstrOid));
11976 12 : if (!HeapTupleIsValid(partcontup))
11977 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11978 :
11979 12 : confrelid = ((Form_pg_constraint) GETSTRUCT(partcontup))->confrelid;
11980 :
11981 : /* Use the same lock as for AT_ValidateConstraint */
11982 12 : QueueFKConstraintValidation(wqueue, conrel, partition, confrelid,
11983 : partcontup, ShareUpdateExclusiveLock);
11984 12 : ReleaseSysCache(partcontup);
11985 12 : table_close(conrel, RowExclusiveLock);
11986 : }
11987 108 : }
11988 :
11989 : /*
11990 : * RemoveInheritedConstraint
11991 : *
11992 : * Removes the constraint and its associated trigger from the specified
11993 : * relation, which inherited the given constraint.
11994 : */
11995 : static void
11996 24 : RemoveInheritedConstraint(Relation conrel, Relation trigrel, Oid conoid,
11997 : Oid conrelid)
11998 : {
11999 : ObjectAddresses *objs;
12000 : HeapTuple consttup;
12001 : ScanKeyData key;
12002 : SysScanDesc scan;
12003 : HeapTuple trigtup;
12004 :
12005 24 : ScanKeyInit(&key,
12006 : Anum_pg_constraint_conrelid,
12007 : BTEqualStrategyNumber, F_OIDEQ,
12008 : ObjectIdGetDatum(conrelid));
12009 :
12010 24 : scan = systable_beginscan(conrel,
12011 : ConstraintRelidTypidNameIndexId,
12012 : true, NULL, 1, &key);
12013 24 : objs = new_object_addresses();
12014 216 : while ((consttup = systable_getnext(scan)) != NULL)
12015 : {
12016 192 : Form_pg_constraint conform = (Form_pg_constraint) GETSTRUCT(consttup);
12017 :
12018 192 : if (conform->conparentid != conoid)
12019 140 : continue;
12020 : else
12021 : {
12022 : ObjectAddress addr;
12023 : SysScanDesc scan2;
12024 : ScanKeyData key2;
12025 : int n PG_USED_FOR_ASSERTS_ONLY;
12026 :
12027 52 : ObjectAddressSet(addr, ConstraintRelationId, conform->oid);
12028 52 : add_exact_object_address(&addr, objs);
12029 :
12030 : /*
12031 : * First we must delete the dependency record that binds the
12032 : * constraint records together.
12033 : */
12034 52 : n = deleteDependencyRecordsForSpecific(ConstraintRelationId,
12035 : conform->oid,
12036 : DEPENDENCY_INTERNAL,
12037 : ConstraintRelationId,
12038 : conoid);
12039 : Assert(n == 1); /* actually only one is expected */
12040 :
12041 : /*
12042 : * Now search for the triggers for this constraint and set them up
12043 : * for deletion too
12044 : */
12045 52 : ScanKeyInit(&key2,
12046 : Anum_pg_trigger_tgconstraint,
12047 : BTEqualStrategyNumber, F_OIDEQ,
12048 : ObjectIdGetDatum(conform->oid));
12049 52 : scan2 = systable_beginscan(trigrel, TriggerConstraintIndexId,
12050 : true, NULL, 1, &key2);
12051 156 : while ((trigtup = systable_getnext(scan2)) != NULL)
12052 : {
12053 104 : ObjectAddressSet(addr, TriggerRelationId,
12054 : ((Form_pg_trigger) GETSTRUCT(trigtup))->oid);
12055 104 : add_exact_object_address(&addr, objs);
12056 : }
12057 52 : systable_endscan(scan2);
12058 : }
12059 : }
12060 : /* make the dependency deletions visible */
12061 24 : CommandCounterIncrement();
12062 24 : performMultipleDeletions(objs, DROP_RESTRICT,
12063 : PERFORM_DELETION_INTERNAL);
12064 24 : systable_endscan(scan);
12065 24 : }
12066 :
12067 : /*
12068 : * DropForeignKeyConstraintTriggers
12069 : *
12070 : * The subroutine for tryAttachPartitionForeignKey handles the deletion of
12071 : * action triggers for the foreign key constraint.
12072 : *
12073 : * If valid confrelid and conrelid values are not provided, the respective
12074 : * trigger check will be skipped, and the trigger will be considered for
12075 : * removal.
12076 : */
12077 : static void
12078 156 : DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid, Oid confrelid,
12079 : Oid conrelid)
12080 : {
12081 : ScanKeyData key;
12082 : SysScanDesc scan;
12083 : HeapTuple trigtup;
12084 :
12085 156 : ScanKeyInit(&key,
12086 : Anum_pg_trigger_tgconstraint,
12087 : BTEqualStrategyNumber, F_OIDEQ,
12088 : ObjectIdGetDatum(conoid));
12089 156 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12090 : NULL, 1, &key);
12091 676 : while ((trigtup = systable_getnext(scan)) != NULL)
12092 : {
12093 520 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12094 : ObjectAddress trigger;
12095 :
12096 : /* Invalid if trigger is not for a referential integrity constraint */
12097 520 : if (!OidIsValid(trgform->tgconstrrelid))
12098 200 : continue;
12099 520 : if (OidIsValid(conrelid) && trgform->tgconstrrelid != conrelid)
12100 200 : continue;
12101 320 : if (OidIsValid(confrelid) && trgform->tgrelid != confrelid)
12102 0 : continue;
12103 :
12104 : /* We should be dropping trigger related to foreign key constraint */
12105 : Assert(trgform->tgfoid == F_RI_FKEY_CHECK_INS ||
12106 : trgform->tgfoid == F_RI_FKEY_CHECK_UPD ||
12107 : trgform->tgfoid == F_RI_FKEY_CASCADE_DEL ||
12108 : trgform->tgfoid == F_RI_FKEY_CASCADE_UPD ||
12109 : trgform->tgfoid == F_RI_FKEY_RESTRICT_DEL ||
12110 : trgform->tgfoid == F_RI_FKEY_RESTRICT_UPD ||
12111 : trgform->tgfoid == F_RI_FKEY_SETNULL_DEL ||
12112 : trgform->tgfoid == F_RI_FKEY_SETNULL_UPD ||
12113 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_DEL ||
12114 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_UPD ||
12115 : trgform->tgfoid == F_RI_FKEY_NOACTION_DEL ||
12116 : trgform->tgfoid == F_RI_FKEY_NOACTION_UPD);
12117 :
12118 : /*
12119 : * The constraint is originally set up to contain this trigger as an
12120 : * implementation object, so there's a dependency record that links
12121 : * the two; however, since the trigger is no longer needed, we remove
12122 : * the dependency link in order to be able to drop the trigger while
12123 : * keeping the constraint intact.
12124 : */
12125 320 : deleteDependencyRecordsFor(TriggerRelationId,
12126 : trgform->oid,
12127 : false);
12128 : /* make dependency deletion visible to performDeletion */
12129 320 : CommandCounterIncrement();
12130 320 : ObjectAddressSet(trigger, TriggerRelationId,
12131 : trgform->oid);
12132 320 : performDeletion(&trigger, DROP_RESTRICT, 0);
12133 : /* make trigger drop visible, in case the loop iterates */
12134 320 : CommandCounterIncrement();
12135 : }
12136 :
12137 156 : systable_endscan(scan);
12138 156 : }
12139 :
12140 : /*
12141 : * GetForeignKeyActionTriggers
12142 : * Returns delete and update "action" triggers of the given relation
12143 : * belonging to the given constraint
12144 : */
12145 : static void
12146 172 : GetForeignKeyActionTriggers(Relation trigrel,
12147 : Oid conoid, Oid confrelid, Oid conrelid,
12148 : Oid *deleteTriggerOid,
12149 : Oid *updateTriggerOid)
12150 : {
12151 : ScanKeyData key;
12152 : SysScanDesc scan;
12153 : HeapTuple trigtup;
12154 :
12155 172 : *deleteTriggerOid = *updateTriggerOid = InvalidOid;
12156 172 : ScanKeyInit(&key,
12157 : Anum_pg_trigger_tgconstraint,
12158 : BTEqualStrategyNumber, F_OIDEQ,
12159 : ObjectIdGetDatum(conoid));
12160 :
12161 172 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12162 : NULL, 1, &key);
12163 356 : while ((trigtup = systable_getnext(scan)) != NULL)
12164 : {
12165 356 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12166 :
12167 356 : if (trgform->tgconstrrelid != conrelid)
12168 12 : continue;
12169 344 : if (trgform->tgrelid != confrelid)
12170 0 : continue;
12171 : /* Only ever look at "action" triggers on the PK side. */
12172 344 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_PK)
12173 0 : continue;
12174 344 : if (TRIGGER_FOR_DELETE(trgform->tgtype))
12175 : {
12176 : Assert(*deleteTriggerOid == InvalidOid);
12177 172 : *deleteTriggerOid = trgform->oid;
12178 : }
12179 172 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12180 : {
12181 : Assert(*updateTriggerOid == InvalidOid);
12182 172 : *updateTriggerOid = trgform->oid;
12183 : }
12184 : #ifndef USE_ASSERT_CHECKING
12185 : /* In an assert-enabled build, continue looking to find duplicates */
12186 344 : if (OidIsValid(*deleteTriggerOid) && OidIsValid(*updateTriggerOid))
12187 172 : break;
12188 : #endif
12189 : }
12190 :
12191 172 : if (!OidIsValid(*deleteTriggerOid))
12192 0 : elog(ERROR, "could not find ON DELETE action trigger of foreign key constraint %u",
12193 : conoid);
12194 172 : if (!OidIsValid(*updateTriggerOid))
12195 0 : elog(ERROR, "could not find ON UPDATE action trigger of foreign key constraint %u",
12196 : conoid);
12197 :
12198 172 : systable_endscan(scan);
12199 172 : }
12200 :
12201 : /*
12202 : * GetForeignKeyCheckTriggers
12203 : * Returns insert and update "check" triggers of the given relation
12204 : * belonging to the given constraint
12205 : */
12206 : static void
12207 587 : GetForeignKeyCheckTriggers(Relation trigrel,
12208 : Oid conoid, Oid confrelid, Oid conrelid,
12209 : Oid *insertTriggerOid,
12210 : Oid *updateTriggerOid)
12211 : {
12212 : ScanKeyData key;
12213 : SysScanDesc scan;
12214 : HeapTuple trigtup;
12215 :
12216 587 : *insertTriggerOid = *updateTriggerOid = InvalidOid;
12217 587 : ScanKeyInit(&key,
12218 : Anum_pg_trigger_tgconstraint,
12219 : BTEqualStrategyNumber, F_OIDEQ,
12220 : ObjectIdGetDatum(conoid));
12221 :
12222 587 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12223 : NULL, 1, &key);
12224 1914 : while ((trigtup = systable_getnext(scan)) != NULL)
12225 : {
12226 1914 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12227 :
12228 1914 : if (trgform->tgconstrrelid != confrelid)
12229 668 : continue;
12230 1246 : if (trgform->tgrelid != conrelid)
12231 0 : continue;
12232 : /* Only ever look at "check" triggers on the FK side. */
12233 1246 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_FK)
12234 72 : continue;
12235 1174 : if (TRIGGER_FOR_INSERT(trgform->tgtype))
12236 : {
12237 : Assert(*insertTriggerOid == InvalidOid);
12238 587 : *insertTriggerOid = trgform->oid;
12239 : }
12240 587 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12241 : {
12242 : Assert(*updateTriggerOid == InvalidOid);
12243 587 : *updateTriggerOid = trgform->oid;
12244 : }
12245 : #ifndef USE_ASSERT_CHECKING
12246 : /* In an assert-enabled build, continue looking to find duplicates. */
12247 1174 : if (OidIsValid(*insertTriggerOid) && OidIsValid(*updateTriggerOid))
12248 587 : break;
12249 : #endif
12250 : }
12251 :
12252 587 : if (!OidIsValid(*insertTriggerOid))
12253 0 : elog(ERROR, "could not find ON INSERT check triggers of foreign key constraint %u",
12254 : conoid);
12255 587 : if (!OidIsValid(*updateTriggerOid))
12256 0 : elog(ERROR, "could not find ON UPDATE check triggers of foreign key constraint %u",
12257 : conoid);
12258 :
12259 587 : systable_endscan(scan);
12260 587 : }
12261 :
12262 : /*
12263 : * ALTER TABLE ALTER CONSTRAINT
12264 : *
12265 : * Update the attributes of a constraint.
12266 : *
12267 : * Currently works for Foreign Key, Check, and not null constraints.
12268 : *
12269 : * If the constraint is modified, returns its address; otherwise, return
12270 : * InvalidObjectAddress.
12271 : */
12272 : static ObjectAddress
12273 284 : ATExecAlterConstraint(List **wqueue, Relation rel, ATAlterConstraint *cmdcon,
12274 : bool recurse, LOCKMODE lockmode)
12275 : {
12276 : Relation conrel;
12277 : Relation tgrel;
12278 : SysScanDesc scan;
12279 : ScanKeyData skey[3];
12280 : HeapTuple contuple;
12281 : Form_pg_constraint currcon;
12282 : ObjectAddress address;
12283 :
12284 : /*
12285 : * Disallow altering ONLY a partitioned table, as it would make no sense.
12286 : * This is okay for legacy inheritance.
12287 : */
12288 284 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
12289 0 : ereport(ERROR,
12290 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12291 : errmsg("constraint must be altered in child tables too"),
12292 : errhint("Do not specify the ONLY keyword."));
12293 :
12294 :
12295 284 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12296 284 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
12297 :
12298 : /*
12299 : * Find and check the target constraint
12300 : */
12301 284 : ScanKeyInit(&skey[0],
12302 : Anum_pg_constraint_conrelid,
12303 : BTEqualStrategyNumber, F_OIDEQ,
12304 : ObjectIdGetDatum(RelationGetRelid(rel)));
12305 284 : ScanKeyInit(&skey[1],
12306 : Anum_pg_constraint_contypid,
12307 : BTEqualStrategyNumber, F_OIDEQ,
12308 : ObjectIdGetDatum(InvalidOid));
12309 284 : ScanKeyInit(&skey[2],
12310 : Anum_pg_constraint_conname,
12311 : BTEqualStrategyNumber, F_NAMEEQ,
12312 284 : CStringGetDatum(cmdcon->conname));
12313 284 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12314 : true, NULL, 3, skey);
12315 :
12316 : /* There can be at most one matching row */
12317 284 : if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
12318 4 : ereport(ERROR,
12319 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12320 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12321 : cmdcon->conname, RelationGetRelationName(rel))));
12322 :
12323 280 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12324 280 : if (cmdcon->alterDeferrability && currcon->contype != CONSTRAINT_FOREIGN)
12325 0 : ereport(ERROR,
12326 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12327 : errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key constraint",
12328 : cmdcon->conname, RelationGetRelationName(rel))));
12329 280 : if (cmdcon->alterEnforceability &&
12330 148 : (currcon->contype != CONSTRAINT_FOREIGN && currcon->contype != CONSTRAINT_CHECK))
12331 8 : ereport(ERROR,
12332 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12333 : errmsg("cannot alter enforceability of constraint \"%s\" of relation \"%s\"",
12334 : cmdcon->conname, RelationGetRelationName(rel)),
12335 : errhint("Only foreign key and check constraints can change enforceability.")));
12336 272 : if (cmdcon->alterInheritability &&
12337 60 : currcon->contype != CONSTRAINT_NOTNULL)
12338 16 : ereport(ERROR,
12339 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12340 : errmsg("constraint \"%s\" of relation \"%s\" is not a not-null constraint",
12341 : cmdcon->conname, RelationGetRelationName(rel)));
12342 :
12343 : /* Refuse to modify inheritability of inherited constraints */
12344 256 : if (cmdcon->alterInheritability &&
12345 44 : cmdcon->noinherit && currcon->coninhcount > 0)
12346 4 : ereport(ERROR,
12347 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12348 : errmsg("cannot alter inherited constraint \"%s\" on relation \"%s\"",
12349 : NameStr(currcon->conname),
12350 : RelationGetRelationName(rel)));
12351 :
12352 : /*
12353 : * If it's not the topmost constraint, raise an error.
12354 : *
12355 : * Altering a non-topmost constraint leaves some triggers untouched, since
12356 : * they are not directly connected to this constraint; also, pg_dump would
12357 : * ignore the deferrability status of the individual constraint, since it
12358 : * only dumps topmost constraints. Avoid these problems by refusing this
12359 : * operation and telling the user to alter the parent constraint instead.
12360 : */
12361 252 : if (OidIsValid(currcon->conparentid))
12362 : {
12363 : HeapTuple tp;
12364 8 : Oid parent = currcon->conparentid;
12365 8 : char *ancestorname = NULL;
12366 8 : char *ancestortable = NULL;
12367 :
12368 : /* Loop to find the topmost constraint */
12369 16 : while (HeapTupleIsValid(tp = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parent))))
12370 : {
12371 16 : Form_pg_constraint contup = (Form_pg_constraint) GETSTRUCT(tp);
12372 :
12373 : /* If no parent, this is the constraint we want */
12374 16 : if (!OidIsValid(contup->conparentid))
12375 : {
12376 8 : ancestorname = pstrdup(NameStr(contup->conname));
12377 8 : ancestortable = get_rel_name(contup->conrelid);
12378 8 : ReleaseSysCache(tp);
12379 8 : break;
12380 : }
12381 :
12382 8 : parent = contup->conparentid;
12383 8 : ReleaseSysCache(tp);
12384 : }
12385 :
12386 8 : ereport(ERROR,
12387 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12388 : errmsg("cannot alter constraint \"%s\" on relation \"%s\"",
12389 : cmdcon->conname, RelationGetRelationName(rel)),
12390 : ancestorname && ancestortable ?
12391 : errdetail("Constraint \"%s\" is derived from constraint \"%s\" of relation \"%s\".",
12392 : cmdcon->conname, ancestorname, ancestortable) : 0,
12393 : errhint("You may alter the constraint it derives from instead.")));
12394 : }
12395 :
12396 244 : address = InvalidObjectAddress;
12397 :
12398 : /*
12399 : * Do the actual catalog work, and recurse if necessary.
12400 : */
12401 244 : if (ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, rel,
12402 : contuple, recurse, lockmode))
12403 224 : ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
12404 :
12405 232 : systable_endscan(scan);
12406 :
12407 232 : table_close(tgrel, RowExclusiveLock);
12408 232 : table_close(conrel, RowExclusiveLock);
12409 :
12410 232 : return address;
12411 : }
12412 :
12413 : /*
12414 : * A subroutine of ATExecAlterConstraint that calls the respective routines for
12415 : * altering constraint's enforceability, deferrability or inheritability.
12416 : */
12417 : static bool
12418 244 : ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon,
12419 : Relation conrel, Relation tgrel, Relation rel,
12420 : HeapTuple contuple, bool recurse,
12421 : LOCKMODE lockmode)
12422 : {
12423 : Form_pg_constraint currcon;
12424 244 : bool changed = false;
12425 244 : List *otherrelids = NIL;
12426 :
12427 244 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12428 :
12429 : /*
12430 : * Do the catalog work for the enforceability or deferrability change,
12431 : * recurse if necessary.
12432 : *
12433 : * Note that even if deferrability is requested to be altered along with
12434 : * enforceability, we don't need to explicitly update multiple entries in
12435 : * pg_trigger related to deferrability.
12436 : *
12437 : * Modifying foreign key enforceability involves either creating or
12438 : * dropping the trigger, during which the deferrability setting will be
12439 : * adjusted automatically.
12440 : */
12441 244 : if (cmdcon->alterEnforceability)
12442 : {
12443 140 : if (currcon->contype == CONSTRAINT_FOREIGN)
12444 52 : changed = ATExecAlterFKConstrEnforceability(wqueue, cmdcon, conrel, tgrel,
12445 : currcon->conrelid,
12446 : currcon->confrelid,
12447 : contuple, lockmode,
12448 : InvalidOid, InvalidOid,
12449 : InvalidOid, InvalidOid);
12450 88 : else if (currcon->contype == CONSTRAINT_CHECK)
12451 88 : changed = ATExecAlterCheckConstrEnforceability(wqueue, cmdcon, conrel,
12452 : contuple, recurse, false,
12453 : lockmode);
12454 : }
12455 168 : else if (cmdcon->alterDeferrability &&
12456 64 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, rel,
12457 : contuple, recurse, &otherrelids,
12458 : lockmode))
12459 : {
12460 : /*
12461 : * AlterConstrUpdateConstraintEntry already invalidated relcache for
12462 : * the relations having the constraint itself; here we also invalidate
12463 : * for relations that have any triggers that are part of the
12464 : * constraint.
12465 : */
12466 204 : foreach_oid(relid, otherrelids)
12467 76 : CacheInvalidateRelcacheByRelid(relid);
12468 :
12469 64 : changed = true;
12470 : }
12471 :
12472 : /*
12473 : * Do the catalog work for the inheritability change.
12474 : */
12475 272 : if (cmdcon->alterInheritability &&
12476 40 : ATExecAlterConstrInheritability(wqueue, cmdcon, conrel, rel, contuple,
12477 : lockmode))
12478 36 : changed = true;
12479 :
12480 232 : return changed;
12481 : }
12482 :
12483 : /*
12484 : * Returns true if the foreign key constraint's enforceability is altered.
12485 : *
12486 : * Depending on whether the constraint is being set to ENFORCED or NOT
12487 : * ENFORCED, it creates or drops the trigger accordingly.
12488 : *
12489 : * Note that we must recurse even when trying to change a constraint to not
12490 : * enforced if it is already not enforced, in case descendant constraints
12491 : * might be enforced and need to be changed to not enforced. Conversely, we
12492 : * should do nothing if a constraint is being set to enforced and is already
12493 : * enforced, as descendant constraints cannot be different in that case.
12494 : */
12495 : static bool
12496 120 : ATExecAlterFKConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12497 : Relation conrel, Relation tgrel,
12498 : Oid fkrelid, Oid pkrelid,
12499 : HeapTuple contuple, LOCKMODE lockmode,
12500 : Oid ReferencedParentDelTrigger,
12501 : Oid ReferencedParentUpdTrigger,
12502 : Oid ReferencingParentInsTrigger,
12503 : Oid ReferencingParentUpdTrigger)
12504 : {
12505 : Form_pg_constraint currcon;
12506 : Oid conoid;
12507 : Relation rel;
12508 120 : bool changed = false;
12509 :
12510 : /* Since this function recurses, it could be driven to stack overflow */
12511 120 : check_stack_depth();
12512 :
12513 : Assert(cmdcon->alterEnforceability);
12514 :
12515 120 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12516 120 : conoid = currcon->oid;
12517 :
12518 : /* Should be foreign key constraint */
12519 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12520 :
12521 120 : rel = table_open(currcon->conrelid, lockmode);
12522 :
12523 120 : if (currcon->conenforced != cmdcon->is_enforced)
12524 : {
12525 116 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12526 116 : changed = true;
12527 : }
12528 :
12529 : /* Drop triggers */
12530 120 : if (!cmdcon->is_enforced)
12531 : {
12532 : /*
12533 : * When setting a constraint to NOT ENFORCED, the constraint triggers
12534 : * need to be dropped. Therefore, we must process the child relations
12535 : * first, followed by the parent, to account for dependencies.
12536 : */
12537 84 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12538 36 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12539 12 : AlterFKConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12540 : fkrelid, pkrelid, contuple,
12541 : lockmode, InvalidOid, InvalidOid,
12542 : InvalidOid, InvalidOid);
12543 :
12544 : /* Drop all the triggers */
12545 48 : DropForeignKeyConstraintTriggers(tgrel, conoid, InvalidOid, InvalidOid);
12546 : }
12547 72 : else if (changed) /* Create triggers */
12548 : {
12549 72 : Oid ReferencedDelTriggerOid = InvalidOid,
12550 72 : ReferencedUpdTriggerOid = InvalidOid,
12551 72 : ReferencingInsTriggerOid = InvalidOid,
12552 72 : ReferencingUpdTriggerOid = InvalidOid;
12553 :
12554 : /* Prepare the minimal information required for trigger creation. */
12555 72 : Constraint *fkconstraint = makeNode(Constraint);
12556 :
12557 72 : fkconstraint->conname = pstrdup(NameStr(currcon->conname));
12558 72 : fkconstraint->fk_matchtype = currcon->confmatchtype;
12559 72 : fkconstraint->fk_upd_action = currcon->confupdtype;
12560 72 : fkconstraint->fk_del_action = currcon->confdeltype;
12561 :
12562 : /* Create referenced triggers */
12563 72 : if (currcon->conrelid == fkrelid)
12564 44 : createForeignKeyActionTriggers(currcon->conrelid,
12565 : currcon->confrelid,
12566 : fkconstraint,
12567 : conoid,
12568 : currcon->conindid,
12569 : ReferencedParentDelTrigger,
12570 : ReferencedParentUpdTrigger,
12571 : &ReferencedDelTriggerOid,
12572 : &ReferencedUpdTriggerOid);
12573 :
12574 : /* Create referencing triggers */
12575 72 : if (currcon->confrelid == pkrelid)
12576 60 : createForeignKeyCheckTriggers(currcon->conrelid,
12577 : pkrelid,
12578 : fkconstraint,
12579 : conoid,
12580 : currcon->conindid,
12581 : ReferencingParentInsTrigger,
12582 : ReferencingParentUpdTrigger,
12583 : &ReferencingInsTriggerOid,
12584 : &ReferencingUpdTriggerOid);
12585 :
12586 : /*
12587 : * Tell Phase 3 to check that the constraint is satisfied by existing
12588 : * rows. Only applies to leaf partitions, and (for constraints that
12589 : * reference a partitioned table) only if this is not one of the
12590 : * pg_constraint rows that exist solely to support action triggers.
12591 : */
12592 72 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
12593 60 : currcon->confrelid == pkrelid)
12594 : {
12595 : AlteredTableInfo *tab;
12596 : NewConstraint *newcon;
12597 :
12598 48 : newcon = palloc0_object(NewConstraint);
12599 48 : newcon->name = fkconstraint->conname;
12600 48 : newcon->contype = CONSTR_FOREIGN;
12601 48 : newcon->refrelid = currcon->confrelid;
12602 48 : newcon->refindid = currcon->conindid;
12603 48 : newcon->conid = currcon->oid;
12604 48 : newcon->qual = (Node *) fkconstraint;
12605 :
12606 : /* Find or create work queue entry for this table */
12607 48 : tab = ATGetQueueEntry(wqueue, rel);
12608 48 : tab->constraints = lappend(tab->constraints, newcon);
12609 : }
12610 :
12611 : /*
12612 : * If the table at either end of the constraint is partitioned, we
12613 : * need to recurse and create triggers for each constraint that is a
12614 : * child of this one.
12615 : */
12616 132 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12617 60 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12618 20 : AlterFKConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12619 : fkrelid, pkrelid, contuple,
12620 : lockmode,
12621 : ReferencedDelTriggerOid,
12622 : ReferencedUpdTriggerOid,
12623 : ReferencingInsTriggerOid,
12624 : ReferencingUpdTriggerOid);
12625 : }
12626 :
12627 120 : table_close(rel, NoLock);
12628 :
12629 120 : return changed;
12630 : }
12631 :
12632 : /*
12633 : * Returns true if the CHECK constraint's enforceability is altered.
12634 : */
12635 : static bool
12636 236 : ATExecAlterCheckConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12637 : Relation conrel, HeapTuple contuple,
12638 : bool recurse, bool recursing, LOCKMODE lockmode)
12639 : {
12640 : Form_pg_constraint currcon;
12641 : Relation rel;
12642 236 : bool changed = false;
12643 236 : List *children = NIL;
12644 :
12645 : /* Since this function recurses, it could be driven to stack overflow */
12646 236 : check_stack_depth();
12647 :
12648 : Assert(cmdcon->alterEnforceability);
12649 :
12650 236 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12651 :
12652 : Assert(currcon->contype == CONSTRAINT_CHECK);
12653 :
12654 : /*
12655 : * Parent relation already locked by caller, children will be locked by
12656 : * find_all_inheritors. So NoLock is fine here.
12657 : */
12658 236 : rel = table_open(currcon->conrelid, NoLock);
12659 :
12660 236 : if (currcon->conenforced != cmdcon->is_enforced)
12661 : {
12662 196 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12663 196 : changed = true;
12664 : }
12665 :
12666 : /*
12667 : * Note that we must recurse even when trying to change a check constraint
12668 : * to not enforced if it is already not enforced, in case descendant
12669 : * constraints might be enforced and need to be changed to not enforced.
12670 : * Conversely, we should do nothing if a constraint is being set to
12671 : * enforced and is already enforced, as descendant constraints cannot be
12672 : * different in that case.
12673 : */
12674 236 : if (!cmdcon->is_enforced || changed)
12675 : {
12676 : /*
12677 : * If we're recursing, the parent has already done this, so skip it.
12678 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't
12679 : * try to look for it in the children.
12680 : */
12681 220 : if (!recursing && !currcon->connoinherit)
12682 84 : children = find_all_inheritors(RelationGetRelid(rel),
12683 : lockmode, NULL);
12684 :
12685 664 : foreach_oid(childoid, children)
12686 : {
12687 240 : if (childoid == RelationGetRelid(rel))
12688 84 : continue;
12689 :
12690 : /*
12691 : * If we are told not to recurse, there had better not be any
12692 : * child tables, because we can't change constraint enforceability
12693 : * on the parent unless we have changed enforceability for all
12694 : * child.
12695 : */
12696 156 : if (!recurse)
12697 8 : ereport(ERROR,
12698 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12699 : errmsg("constraint must be altered on child tables too"),
12700 : errhint("Do not specify the ONLY keyword."));
12701 :
12702 148 : AlterCheckConstrEnforceabilityRecurse(wqueue, cmdcon, conrel,
12703 : childoid, false, true,
12704 : lockmode);
12705 : }
12706 : }
12707 :
12708 : /*
12709 : * Tell Phase 3 to check that the constraint is satisfied by existing
12710 : * rows. We only need do this when altering the constraint from NOT
12711 : * ENFORCED to ENFORCED.
12712 : */
12713 228 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
12714 180 : !currcon->conenforced &&
12715 128 : cmdcon->is_enforced)
12716 : {
12717 : AlteredTableInfo *tab;
12718 : NewConstraint *newcon;
12719 : Datum val;
12720 : char *conbin;
12721 :
12722 116 : newcon = palloc0_object(NewConstraint);
12723 116 : newcon->name = pstrdup(NameStr(currcon->conname));
12724 116 : newcon->contype = CONSTR_CHECK;
12725 :
12726 116 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
12727 : Anum_pg_constraint_conbin);
12728 116 : conbin = TextDatumGetCString(val);
12729 116 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
12730 :
12731 : /* Find or create work queue entry for this table */
12732 116 : tab = ATGetQueueEntry(wqueue, rel);
12733 116 : tab->constraints = lappend(tab->constraints, newcon);
12734 : }
12735 :
12736 228 : table_close(rel, NoLock);
12737 :
12738 228 : return changed;
12739 : }
12740 :
12741 : /*
12742 : * Invokes ATExecAlterCheckConstrEnforceability for each CHECK constraint that
12743 : * is a child of the specified constraint.
12744 : *
12745 : * We rely on the parent and child tables having identical CHECK constraint
12746 : * names to retrieve the child's pg_constraint tuple.
12747 : *
12748 : * The arguments to this function have the same meaning as the arguments to
12749 : * ATExecAlterCheckConstrEnforceability.
12750 : */
12751 : static void
12752 148 : AlterCheckConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12753 : Relation conrel, Oid conrelid,
12754 : bool recurse, bool recursing,
12755 : LOCKMODE lockmode)
12756 : {
12757 : SysScanDesc pscan;
12758 : HeapTuple childtup;
12759 : ScanKeyData skey[3];
12760 :
12761 148 : ScanKeyInit(&skey[0],
12762 : Anum_pg_constraint_conrelid,
12763 : BTEqualStrategyNumber, F_OIDEQ,
12764 : ObjectIdGetDatum(conrelid));
12765 148 : ScanKeyInit(&skey[1],
12766 : Anum_pg_constraint_contypid,
12767 : BTEqualStrategyNumber, F_OIDEQ,
12768 : ObjectIdGetDatum(InvalidOid));
12769 148 : ScanKeyInit(&skey[2],
12770 : Anum_pg_constraint_conname,
12771 : BTEqualStrategyNumber, F_NAMEEQ,
12772 148 : CStringGetDatum(cmdcon->conname));
12773 :
12774 148 : pscan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId, true,
12775 : NULL, 3, skey);
12776 :
12777 148 : if (!HeapTupleIsValid(childtup = systable_getnext(pscan)))
12778 0 : ereport(ERROR,
12779 : errcode(ERRCODE_UNDEFINED_OBJECT),
12780 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12781 : cmdcon->conname, get_rel_name(conrelid)));
12782 :
12783 148 : ATExecAlterCheckConstrEnforceability(wqueue, cmdcon, conrel, childtup,
12784 : recurse, recursing, lockmode);
12785 :
12786 148 : systable_endscan(pscan);
12787 148 : }
12788 :
12789 : /*
12790 : * Returns true if the constraint's deferrability is altered.
12791 : *
12792 : * *otherrelids is appended OIDs of relations containing affected triggers.
12793 : *
12794 : * Note that we must recurse even when the values are correct, in case
12795 : * indirect descendants have had their constraints altered locally.
12796 : * (This could be avoided if we forbade altering constraints in partitions
12797 : * but existing releases don't do that.)
12798 : */
12799 : static bool
12800 108 : ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
12801 : Relation conrel, Relation tgrel, Relation rel,
12802 : HeapTuple contuple, bool recurse,
12803 : List **otherrelids, LOCKMODE lockmode)
12804 : {
12805 : Form_pg_constraint currcon;
12806 : Oid refrelid;
12807 108 : bool changed = false;
12808 :
12809 : /* since this function recurses, it could be driven to stack overflow */
12810 108 : check_stack_depth();
12811 :
12812 : Assert(cmdcon->alterDeferrability);
12813 :
12814 108 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12815 108 : refrelid = currcon->confrelid;
12816 :
12817 : /* Should be foreign key constraint */
12818 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12819 :
12820 : /*
12821 : * If called to modify a constraint that's already in the desired state,
12822 : * silently do nothing.
12823 : */
12824 108 : if (currcon->condeferrable != cmdcon->deferrable ||
12825 4 : currcon->condeferred != cmdcon->initdeferred)
12826 : {
12827 108 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12828 108 : changed = true;
12829 :
12830 : /*
12831 : * Now we need to update the multiple entries in pg_trigger that
12832 : * implement the constraint.
12833 : */
12834 108 : AlterConstrTriggerDeferrability(currcon->oid, tgrel, rel,
12835 108 : cmdcon->deferrable,
12836 108 : cmdcon->initdeferred, otherrelids);
12837 : }
12838 :
12839 : /*
12840 : * If the table at either end of the constraint is partitioned, we need to
12841 : * handle every constraint that is a child of this one.
12842 : */
12843 108 : if (recurse && changed &&
12844 200 : (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12845 92 : get_rel_relkind(refrelid) == RELKIND_PARTITIONED_TABLE))
12846 28 : AlterConstrDeferrabilityRecurse(wqueue, cmdcon, conrel, tgrel, rel,
12847 : contuple, recurse, otherrelids,
12848 : lockmode);
12849 :
12850 108 : return changed;
12851 : }
12852 :
12853 : /*
12854 : * Returns true if the constraint's inheritability is altered.
12855 : */
12856 : static bool
12857 40 : ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
12858 : Relation conrel, Relation rel,
12859 : HeapTuple contuple, LOCKMODE lockmode)
12860 : {
12861 : Form_pg_constraint currcon;
12862 : AttrNumber colNum;
12863 : char *colName;
12864 : List *children;
12865 :
12866 : Assert(cmdcon->alterInheritability);
12867 :
12868 40 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12869 :
12870 : /* The current implementation only works for NOT NULL constraints */
12871 : Assert(currcon->contype == CONSTRAINT_NOTNULL);
12872 :
12873 : /*
12874 : * If called to modify a constraint that's already in the desired state,
12875 : * silently do nothing.
12876 : */
12877 40 : if (cmdcon->noinherit == currcon->connoinherit)
12878 0 : return false;
12879 :
12880 40 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12881 40 : CommandCounterIncrement();
12882 :
12883 : /* Fetch the column number and name */
12884 40 : colNum = extractNotNullColumn(contuple);
12885 40 : colName = get_attname(currcon->conrelid, colNum, false);
12886 :
12887 : /*
12888 : * Propagate the change to children. For this subcommand type we don't
12889 : * recursively affect children, just the immediate level.
12890 : */
12891 40 : children = find_inheritance_children(RelationGetRelid(rel),
12892 : lockmode);
12893 128 : foreach_oid(childoid, children)
12894 : {
12895 : ObjectAddress addr;
12896 :
12897 56 : if (cmdcon->noinherit)
12898 : {
12899 : HeapTuple childtup;
12900 : Form_pg_constraint childcon;
12901 :
12902 20 : childtup = findNotNullConstraint(childoid, colName);
12903 20 : if (!childtup)
12904 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
12905 : colName, childoid);
12906 20 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12907 : Assert(childcon->coninhcount > 0);
12908 20 : childcon->coninhcount--;
12909 20 : childcon->conislocal = true;
12910 20 : CatalogTupleUpdate(conrel, &childtup->t_self, childtup);
12911 20 : heap_freetuple(childtup);
12912 : }
12913 : else
12914 : {
12915 36 : Relation childrel = table_open(childoid, NoLock);
12916 :
12917 36 : addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
12918 : colName, true, true, lockmode);
12919 32 : if (OidIsValid(addr.objectId))
12920 32 : CommandCounterIncrement();
12921 32 : table_close(childrel, NoLock);
12922 : }
12923 : }
12924 :
12925 36 : return true;
12926 : }
12927 :
12928 : /*
12929 : * A subroutine of ATExecAlterConstrDeferrability that updated constraint
12930 : * trigger's deferrability.
12931 : *
12932 : * The arguments to this function have the same meaning as the arguments to
12933 : * ATExecAlterConstrDeferrability.
12934 : */
12935 : static void
12936 108 : AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
12937 : bool deferrable, bool initdeferred,
12938 : List **otherrelids)
12939 : {
12940 : HeapTuple tgtuple;
12941 : ScanKeyData tgkey;
12942 : SysScanDesc tgscan;
12943 :
12944 108 : ScanKeyInit(&tgkey,
12945 : Anum_pg_trigger_tgconstraint,
12946 : BTEqualStrategyNumber, F_OIDEQ,
12947 : ObjectIdGetDatum(conoid));
12948 108 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
12949 : NULL, 1, &tgkey);
12950 420 : while (HeapTupleIsValid(tgtuple = systable_getnext(tgscan)))
12951 : {
12952 312 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tgtuple);
12953 : Form_pg_trigger copy_tg;
12954 : HeapTuple tgCopyTuple;
12955 :
12956 : /*
12957 : * Remember OIDs of other relation(s) involved in FK constraint.
12958 : * (Note: it's likely that we could skip forcing a relcache inval for
12959 : * other rels that don't have a trigger whose properties change, but
12960 : * let's be conservative.)
12961 : */
12962 312 : if (tgform->tgrelid != RelationGetRelid(rel))
12963 152 : *otherrelids = list_append_unique_oid(*otherrelids,
12964 : tgform->tgrelid);
12965 :
12966 : /*
12967 : * Update enable status and deferrability of RI_FKey_noaction_del,
12968 : * RI_FKey_noaction_upd, RI_FKey_check_ins and RI_FKey_check_upd
12969 : * triggers, but not others; see createForeignKeyActionTriggers and
12970 : * CreateFKCheckTrigger.
12971 : */
12972 312 : if (tgform->tgfoid != F_RI_FKEY_NOACTION_DEL &&
12973 248 : tgform->tgfoid != F_RI_FKEY_NOACTION_UPD &&
12974 172 : tgform->tgfoid != F_RI_FKEY_CHECK_INS &&
12975 92 : tgform->tgfoid != F_RI_FKEY_CHECK_UPD)
12976 12 : continue;
12977 :
12978 300 : tgCopyTuple = heap_copytuple(tgtuple);
12979 300 : copy_tg = (Form_pg_trigger) GETSTRUCT(tgCopyTuple);
12980 :
12981 300 : copy_tg->tgdeferrable = deferrable;
12982 300 : copy_tg->tginitdeferred = initdeferred;
12983 300 : CatalogTupleUpdate(tgrel, &tgCopyTuple->t_self, tgCopyTuple);
12984 :
12985 300 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
12986 :
12987 300 : heap_freetuple(tgCopyTuple);
12988 : }
12989 :
12990 108 : systable_endscan(tgscan);
12991 108 : }
12992 :
12993 : /*
12994 : * Invokes ATExecAlterFKConstrEnforceability for each foreign key constraint
12995 : * that is a child of the specified constraint.
12996 : *
12997 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
12998 : * list of child relations and recursing; instead it uses the conparentid
12999 : * relationships. This may need to be reconsidered.
13000 : *
13001 : * The arguments to this function have the same meaning as the arguments to
13002 : * ATExecAlterFKConstrEnforceability.
13003 : */
13004 : static void
13005 32 : AlterFKConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
13006 : Relation conrel, Relation tgrel,
13007 : Oid fkrelid, Oid pkrelid,
13008 : HeapTuple contuple, LOCKMODE lockmode,
13009 : Oid ReferencedParentDelTrigger,
13010 : Oid ReferencedParentUpdTrigger,
13011 : Oid ReferencingParentInsTrigger,
13012 : Oid ReferencingParentUpdTrigger)
13013 : {
13014 : Form_pg_constraint currcon;
13015 : Oid conoid;
13016 : ScanKeyData pkey;
13017 : SysScanDesc pscan;
13018 : HeapTuple childtup;
13019 :
13020 32 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
13021 32 : conoid = currcon->oid;
13022 :
13023 32 : ScanKeyInit(&pkey,
13024 : Anum_pg_constraint_conparentid,
13025 : BTEqualStrategyNumber, F_OIDEQ,
13026 : ObjectIdGetDatum(conoid));
13027 :
13028 32 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13029 : true, NULL, 1, &pkey);
13030 :
13031 100 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13032 68 : ATExecAlterFKConstrEnforceability(wqueue, cmdcon, conrel, tgrel, fkrelid,
13033 : pkrelid, childtup, lockmode,
13034 : ReferencedParentDelTrigger,
13035 : ReferencedParentUpdTrigger,
13036 : ReferencingParentInsTrigger,
13037 : ReferencingParentUpdTrigger);
13038 :
13039 32 : systable_endscan(pscan);
13040 32 : }
13041 :
13042 : /*
13043 : * Invokes ATExecAlterConstrDeferrability for each constraint that is a child of
13044 : * the specified constraint.
13045 : *
13046 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
13047 : * list of child relations and recursing; instead it uses the conparentid
13048 : * relationships. This may need to be reconsidered.
13049 : *
13050 : * The arguments to this function have the same meaning as the arguments to
13051 : * ATExecAlterConstrDeferrability.
13052 : */
13053 : static void
13054 28 : AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
13055 : Relation conrel, Relation tgrel, Relation rel,
13056 : HeapTuple contuple, bool recurse,
13057 : List **otherrelids, LOCKMODE lockmode)
13058 : {
13059 : Form_pg_constraint currcon;
13060 : Oid conoid;
13061 : ScanKeyData pkey;
13062 : SysScanDesc pscan;
13063 : HeapTuple childtup;
13064 :
13065 28 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
13066 28 : conoid = currcon->oid;
13067 :
13068 28 : ScanKeyInit(&pkey,
13069 : Anum_pg_constraint_conparentid,
13070 : BTEqualStrategyNumber, F_OIDEQ,
13071 : ObjectIdGetDatum(conoid));
13072 :
13073 28 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13074 : true, NULL, 1, &pkey);
13075 :
13076 72 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13077 : {
13078 44 : Form_pg_constraint childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13079 : Relation childrel;
13080 :
13081 44 : childrel = table_open(childcon->conrelid, lockmode);
13082 :
13083 44 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, childrel,
13084 : childtup, recurse, otherrelids, lockmode);
13085 44 : table_close(childrel, NoLock);
13086 : }
13087 :
13088 28 : systable_endscan(pscan);
13089 28 : }
13090 :
13091 : /*
13092 : * Update the constraint entry for the given ATAlterConstraint command, and
13093 : * invoke the appropriate hooks.
13094 : */
13095 : static void
13096 460 : AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
13097 : HeapTuple contuple)
13098 : {
13099 : HeapTuple copyTuple;
13100 : Form_pg_constraint copy_con;
13101 :
13102 : Assert(cmdcon->alterEnforceability || cmdcon->alterDeferrability ||
13103 : cmdcon->alterInheritability);
13104 :
13105 460 : copyTuple = heap_copytuple(contuple);
13106 460 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13107 :
13108 460 : if (cmdcon->alterEnforceability)
13109 : {
13110 312 : copy_con->conenforced = cmdcon->is_enforced;
13111 :
13112 : /*
13113 : * NB: The convalidated status is irrelevant when the constraint is
13114 : * set to NOT ENFORCED, but for consistency, it should still be set
13115 : * appropriately. Similarly, if the constraint is later changed to
13116 : * ENFORCED, validation will be performed during phase 3, so it makes
13117 : * sense to mark it as valid in that case.
13118 : */
13119 312 : copy_con->convalidated = cmdcon->is_enforced;
13120 : }
13121 460 : if (cmdcon->alterDeferrability)
13122 : {
13123 112 : copy_con->condeferrable = cmdcon->deferrable;
13124 112 : copy_con->condeferred = cmdcon->initdeferred;
13125 : }
13126 460 : if (cmdcon->alterInheritability)
13127 40 : copy_con->connoinherit = cmdcon->noinherit;
13128 :
13129 460 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13130 460 : InvokeObjectPostAlterHook(ConstraintRelationId, copy_con->oid, 0);
13131 :
13132 : /* Make new constraint flags visible to others */
13133 460 : CacheInvalidateRelcacheByRelid(copy_con->conrelid);
13134 :
13135 460 : heap_freetuple(copyTuple);
13136 460 : }
13137 :
13138 : /*
13139 : * ALTER TABLE VALIDATE CONSTRAINT
13140 : *
13141 : * XXX The reason we handle recursion here rather than at Phase 1 is because
13142 : * there's no good way to skip recursing when handling foreign keys: there is
13143 : * no need to lock children in that case, yet we wouldn't be able to avoid
13144 : * doing so at that level.
13145 : *
13146 : * Return value is the address of the validated constraint. If the constraint
13147 : * was already validated, InvalidObjectAddress is returned.
13148 : */
13149 : static ObjectAddress
13150 347 : ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
13151 : bool recurse, bool recursing, LOCKMODE lockmode)
13152 : {
13153 : Relation conrel;
13154 : SysScanDesc scan;
13155 : ScanKeyData skey[3];
13156 : HeapTuple tuple;
13157 : Form_pg_constraint con;
13158 : ObjectAddress address;
13159 :
13160 347 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
13161 :
13162 : /*
13163 : * Find and check the target constraint
13164 : */
13165 347 : ScanKeyInit(&skey[0],
13166 : Anum_pg_constraint_conrelid,
13167 : BTEqualStrategyNumber, F_OIDEQ,
13168 : ObjectIdGetDatum(RelationGetRelid(rel)));
13169 347 : ScanKeyInit(&skey[1],
13170 : Anum_pg_constraint_contypid,
13171 : BTEqualStrategyNumber, F_OIDEQ,
13172 : ObjectIdGetDatum(InvalidOid));
13173 347 : ScanKeyInit(&skey[2],
13174 : Anum_pg_constraint_conname,
13175 : BTEqualStrategyNumber, F_NAMEEQ,
13176 : CStringGetDatum(constrName));
13177 347 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
13178 : true, NULL, 3, skey);
13179 :
13180 : /* There can be at most one matching row */
13181 347 : if (!HeapTupleIsValid(tuple = systable_getnext(scan)))
13182 0 : ereport(ERROR,
13183 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13184 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
13185 : constrName, RelationGetRelationName(rel))));
13186 :
13187 347 : con = (Form_pg_constraint) GETSTRUCT(tuple);
13188 347 : if (con->contype != CONSTRAINT_FOREIGN &&
13189 170 : con->contype != CONSTRAINT_CHECK &&
13190 74 : con->contype != CONSTRAINT_NOTNULL)
13191 0 : ereport(ERROR,
13192 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
13193 : errmsg("cannot validate constraint \"%s\" of relation \"%s\"",
13194 : constrName, RelationGetRelationName(rel)),
13195 : errdetail("This operation is not supported for this type of constraint."));
13196 :
13197 347 : if (!con->conenforced)
13198 4 : ereport(ERROR,
13199 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13200 : errmsg("cannot validate NOT ENFORCED constraint")));
13201 :
13202 343 : if (!con->convalidated)
13203 : {
13204 331 : if (con->contype == CONSTRAINT_FOREIGN)
13205 : {
13206 173 : QueueFKConstraintValidation(wqueue, conrel, rel, con->confrelid,
13207 : tuple, lockmode);
13208 : }
13209 158 : else if (con->contype == CONSTRAINT_CHECK)
13210 : {
13211 84 : QueueCheckConstraintValidation(wqueue, conrel, rel, constrName,
13212 : tuple, recurse, recursing, lockmode);
13213 : }
13214 74 : else if (con->contype == CONSTRAINT_NOTNULL)
13215 : {
13216 74 : QueueNNConstraintValidation(wqueue, conrel, rel,
13217 : tuple, recurse, recursing, lockmode);
13218 : }
13219 :
13220 331 : ObjectAddressSet(address, ConstraintRelationId, con->oid);
13221 : }
13222 : else
13223 12 : address = InvalidObjectAddress; /* already validated */
13224 :
13225 343 : systable_endscan(scan);
13226 :
13227 343 : table_close(conrel, RowExclusiveLock);
13228 :
13229 343 : return address;
13230 : }
13231 :
13232 : /*
13233 : * QueueFKConstraintValidation
13234 : *
13235 : * Add an entry to the wqueue to validate the given foreign key constraint in
13236 : * Phase 3 and update the convalidated field in the pg_constraint catalog
13237 : * for the specified relation and all its children.
13238 : */
13239 : static void
13240 225 : QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
13241 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode)
13242 : {
13243 : Form_pg_constraint con;
13244 : AlteredTableInfo *tab;
13245 : HeapTuple copyTuple;
13246 : Form_pg_constraint copy_con;
13247 :
13248 225 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13249 : Assert(con->contype == CONSTRAINT_FOREIGN);
13250 : Assert(!con->convalidated);
13251 :
13252 : /*
13253 : * Add the validation to phase 3's queue; not needed for partitioned
13254 : * tables themselves, only for their partitions.
13255 : *
13256 : * When the referenced table (pkrelid) is partitioned, the referencing
13257 : * table (fkrel) has one pg_constraint row pointing to each partition
13258 : * thereof. These rows are there only to support action triggers and no
13259 : * table scan is needed, therefore skip this for them as well.
13260 : */
13261 225 : if (fkrel->rd_rel->relkind == RELKIND_RELATION &&
13262 193 : con->confrelid == pkrelid)
13263 : {
13264 : NewConstraint *newcon;
13265 : Constraint *fkconstraint;
13266 :
13267 : /* Queue validation for phase 3 */
13268 181 : fkconstraint = makeNode(Constraint);
13269 : /* for now this is all we need */
13270 181 : fkconstraint->conname = pstrdup(NameStr(con->conname));
13271 :
13272 181 : newcon = palloc0_object(NewConstraint);
13273 181 : newcon->name = fkconstraint->conname;
13274 181 : newcon->contype = CONSTR_FOREIGN;
13275 181 : newcon->refrelid = con->confrelid;
13276 181 : newcon->refindid = con->conindid;
13277 181 : newcon->conid = con->oid;
13278 181 : newcon->qual = (Node *) fkconstraint;
13279 :
13280 : /* Find or create work queue entry for this table */
13281 181 : tab = ATGetQueueEntry(wqueue, fkrel);
13282 181 : tab->constraints = lappend(tab->constraints, newcon);
13283 : }
13284 :
13285 : /*
13286 : * If the table at either end of the constraint is partitioned, we need to
13287 : * recurse and handle every unvalidated constraint that is a child of this
13288 : * constraint.
13289 : */
13290 418 : if (fkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
13291 193 : get_rel_relkind(con->confrelid) == RELKIND_PARTITIONED_TABLE)
13292 : {
13293 : ScanKeyData pkey;
13294 : SysScanDesc pscan;
13295 : HeapTuple childtup;
13296 :
13297 52 : ScanKeyInit(&pkey,
13298 : Anum_pg_constraint_conparentid,
13299 : BTEqualStrategyNumber, F_OIDEQ,
13300 : ObjectIdGetDatum(con->oid));
13301 :
13302 52 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13303 : true, NULL, 1, &pkey);
13304 :
13305 104 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13306 : {
13307 : Form_pg_constraint childcon;
13308 : Relation childrel;
13309 :
13310 52 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13311 :
13312 : /*
13313 : * If the child constraint has already been validated, no further
13314 : * action is required for it or its descendants, as they are all
13315 : * valid.
13316 : */
13317 52 : if (childcon->convalidated)
13318 12 : continue;
13319 :
13320 40 : childrel = table_open(childcon->conrelid, lockmode);
13321 :
13322 : /*
13323 : * NB: Note that pkrelid should be passed as-is during recursion,
13324 : * as it is required to identify the root referenced table.
13325 : */
13326 40 : QueueFKConstraintValidation(wqueue, conrel, childrel, pkrelid,
13327 : childtup, lockmode);
13328 40 : table_close(childrel, NoLock);
13329 : }
13330 :
13331 52 : systable_endscan(pscan);
13332 : }
13333 :
13334 : /*
13335 : * Now mark the pg_constraint row as validated (even if we didn't check,
13336 : * notably the ones for partitions on the referenced side).
13337 : *
13338 : * We rely on transaction abort to roll back this change if phase 3
13339 : * ultimately finds violating rows. This is a bit ugly.
13340 : */
13341 225 : copyTuple = heap_copytuple(contuple);
13342 225 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13343 225 : copy_con->convalidated = true;
13344 225 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13345 :
13346 225 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13347 :
13348 225 : heap_freetuple(copyTuple);
13349 225 : }
13350 :
13351 : /*
13352 : * QueueCheckConstraintValidation
13353 : *
13354 : * Add an entry to the wqueue to validate the given check constraint in Phase 3
13355 : * and update the convalidated field in the pg_constraint catalog for the
13356 : * specified relation and all its inheriting children.
13357 : */
13358 : static void
13359 84 : QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13360 : char *constrName, HeapTuple contuple,
13361 : bool recurse, bool recursing, LOCKMODE lockmode)
13362 : {
13363 : Form_pg_constraint con;
13364 : AlteredTableInfo *tab;
13365 : HeapTuple copyTuple;
13366 : Form_pg_constraint copy_con;
13367 :
13368 84 : List *children = NIL;
13369 : ListCell *child;
13370 : NewConstraint *newcon;
13371 : Datum val;
13372 : char *conbin;
13373 :
13374 84 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13375 : Assert(con->contype == CONSTRAINT_CHECK);
13376 :
13377 : /*
13378 : * If we're recursing, the parent has already done this, so skip it. Also,
13379 : * if the constraint is a NO INHERIT constraint, we shouldn't try to look
13380 : * for it in the children.
13381 : */
13382 84 : if (!recursing && !con->connoinherit)
13383 48 : children = find_all_inheritors(RelationGetRelid(rel),
13384 : lockmode, NULL);
13385 :
13386 : /*
13387 : * For CHECK constraints, we must ensure that we only mark the constraint
13388 : * as validated on the parent if it's already validated on the children.
13389 : *
13390 : * We recurse before validating on the parent, to reduce risk of
13391 : * deadlocks.
13392 : */
13393 164 : foreach(child, children)
13394 : {
13395 80 : Oid childoid = lfirst_oid(child);
13396 : Relation childrel;
13397 :
13398 80 : if (childoid == RelationGetRelid(rel))
13399 48 : continue;
13400 :
13401 : /*
13402 : * If we are told not to recurse, there had better not be any child
13403 : * tables, because we can't mark the constraint on the parent valid
13404 : * unless it is valid for all child tables.
13405 : */
13406 32 : if (!recurse)
13407 0 : ereport(ERROR,
13408 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13409 : errmsg("constraint must be validated on child tables too")));
13410 :
13411 : /* find_all_inheritors already got lock */
13412 32 : childrel = table_open(childoid, NoLock);
13413 :
13414 32 : ATExecValidateConstraint(wqueue, childrel, constrName, false,
13415 : true, lockmode);
13416 32 : table_close(childrel, NoLock);
13417 : }
13418 :
13419 : /* Queue validation for phase 3 */
13420 84 : newcon = palloc0_object(NewConstraint);
13421 84 : newcon->name = constrName;
13422 84 : newcon->contype = CONSTR_CHECK;
13423 84 : newcon->refrelid = InvalidOid;
13424 84 : newcon->refindid = InvalidOid;
13425 84 : newcon->conid = con->oid;
13426 :
13427 84 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
13428 : Anum_pg_constraint_conbin);
13429 84 : conbin = TextDatumGetCString(val);
13430 84 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
13431 :
13432 : /* Find or create work queue entry for this table */
13433 84 : tab = ATGetQueueEntry(wqueue, rel);
13434 84 : tab->constraints = lappend(tab->constraints, newcon);
13435 :
13436 : /*
13437 : * Invalidate relcache so that others see the new validated constraint.
13438 : */
13439 84 : CacheInvalidateRelcache(rel);
13440 :
13441 : /*
13442 : * Now update the catalog, while we have the door open.
13443 : */
13444 84 : copyTuple = heap_copytuple(contuple);
13445 84 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13446 84 : copy_con->convalidated = true;
13447 84 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13448 :
13449 84 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13450 :
13451 84 : heap_freetuple(copyTuple);
13452 84 : }
13453 :
13454 : /*
13455 : * QueueNNConstraintValidation
13456 : *
13457 : * Add an entry to the wqueue to validate the given not-null constraint in
13458 : * Phase 3 and update the convalidated field in the pg_constraint catalog for
13459 : * the specified relation and all its inheriting children.
13460 : */
13461 : static void
13462 74 : QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13463 : HeapTuple contuple, bool recurse, bool recursing,
13464 : LOCKMODE lockmode)
13465 : {
13466 : Form_pg_constraint con;
13467 : AlteredTableInfo *tab;
13468 : HeapTuple copyTuple;
13469 : Form_pg_constraint copy_con;
13470 74 : List *children = NIL;
13471 : AttrNumber attnum;
13472 : char *colname;
13473 :
13474 74 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13475 : Assert(con->contype == CONSTRAINT_NOTNULL);
13476 :
13477 74 : attnum = extractNotNullColumn(contuple);
13478 :
13479 : /*
13480 : * If we're recursing, we've already done this for parent, so skip it.
13481 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't try to
13482 : * look for it in the children.
13483 : *
13484 : * We recurse before validating on the parent, to reduce risk of
13485 : * deadlocks.
13486 : */
13487 74 : if (!recursing && !con->connoinherit)
13488 50 : children = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
13489 :
13490 74 : colname = get_attname(RelationGetRelid(rel), attnum, false);
13491 250 : foreach_oid(childoid, children)
13492 : {
13493 : Relation childrel;
13494 : HeapTuple contup;
13495 : Form_pg_constraint childcon;
13496 : char *conname;
13497 :
13498 102 : if (childoid == RelationGetRelid(rel))
13499 50 : continue;
13500 :
13501 : /*
13502 : * If we are told not to recurse, there had better not be any child
13503 : * tables, because we can't mark the constraint on the parent valid
13504 : * unless it is valid for all child tables.
13505 : */
13506 52 : if (!recurse)
13507 0 : ereport(ERROR,
13508 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13509 : errmsg("constraint must be validated on child tables too"));
13510 :
13511 : /*
13512 : * The column on child might have a different attnum, so search by
13513 : * column name.
13514 : */
13515 52 : contup = findNotNullConstraint(childoid, colname);
13516 52 : if (!contup)
13517 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
13518 : colname, get_rel_name(childoid));
13519 52 : childcon = (Form_pg_constraint) GETSTRUCT(contup);
13520 52 : if (childcon->convalidated)
13521 28 : continue;
13522 :
13523 : /* find_all_inheritors already got lock */
13524 24 : childrel = table_open(childoid, NoLock);
13525 24 : conname = pstrdup(NameStr(childcon->conname));
13526 :
13527 : /* XXX improve ATExecValidateConstraint API to avoid double search */
13528 24 : ATExecValidateConstraint(wqueue, childrel, conname,
13529 : false, true, lockmode);
13530 24 : table_close(childrel, NoLock);
13531 : }
13532 :
13533 : /* Set attnotnull appropriately without queueing another validation */
13534 74 : set_attnotnull(NULL, rel, attnum, true, false);
13535 :
13536 74 : tab = ATGetQueueEntry(wqueue, rel);
13537 74 : tab->verify_new_notnull = true;
13538 :
13539 : /*
13540 : * Invalidate relcache so that others see the new validated constraint.
13541 : */
13542 74 : CacheInvalidateRelcache(rel);
13543 :
13544 : /*
13545 : * Now update the catalogs, while we have the door open.
13546 : */
13547 74 : copyTuple = heap_copytuple(contuple);
13548 74 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13549 74 : copy_con->convalidated = true;
13550 74 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13551 :
13552 74 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13553 :
13554 74 : heap_freetuple(copyTuple);
13555 74 : }
13556 :
13557 : /*
13558 : * transformColumnNameList - transform list of column names
13559 : *
13560 : * Lookup each name and return its attnum and, optionally, type and collation
13561 : * OIDs
13562 : *
13563 : * Note: the name of this function suggests that it's general-purpose,
13564 : * but actually it's only used to look up names appearing in foreign-key
13565 : * clauses. The error messages would need work to use it in other cases,
13566 : * and perhaps the validity checks as well.
13567 : */
13568 : static int
13569 4299 : transformColumnNameList(Oid relId, List *colList,
13570 : int16 *attnums, Oid *atttypids, Oid *attcollids)
13571 : {
13572 : ListCell *l;
13573 : int attnum;
13574 :
13575 4299 : attnum = 0;
13576 7858 : foreach(l, colList)
13577 : {
13578 3603 : char *attname = strVal(lfirst(l));
13579 : HeapTuple atttuple;
13580 : Form_pg_attribute attform;
13581 :
13582 3603 : atttuple = SearchSysCacheAttName(relId, attname);
13583 3603 : if (!HeapTupleIsValid(atttuple))
13584 36 : ereport(ERROR,
13585 : (errcode(ERRCODE_UNDEFINED_COLUMN),
13586 : errmsg("column \"%s\" referenced in foreign key constraint does not exist",
13587 : attname)));
13588 3567 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
13589 3567 : if (attform->attnum < 0)
13590 8 : ereport(ERROR,
13591 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
13592 : errmsg("system columns cannot be used in foreign keys")));
13593 3559 : if (attnum >= INDEX_MAX_KEYS)
13594 0 : ereport(ERROR,
13595 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
13596 : errmsg("cannot have more than %d keys in a foreign key",
13597 : INDEX_MAX_KEYS)));
13598 3559 : attnums[attnum] = attform->attnum;
13599 3559 : if (atttypids != NULL)
13600 3535 : atttypids[attnum] = attform->atttypid;
13601 3559 : if (attcollids != NULL)
13602 3535 : attcollids[attnum] = attform->attcollation;
13603 3559 : ReleaseSysCache(atttuple);
13604 3559 : attnum++;
13605 : }
13606 :
13607 4255 : return attnum;
13608 : }
13609 :
13610 : /*
13611 : * transformFkeyGetPrimaryKey -
13612 : *
13613 : * Look up the names, attnums, types, and collations of the primary key attributes
13614 : * for the pkrel. Also return the index OID and index opclasses of the
13615 : * index supporting the primary key. Also return whether the index has
13616 : * WITHOUT OVERLAPS.
13617 : *
13618 : * All parameters except pkrel are output parameters. Also, the function
13619 : * return value is the number of attributes in the primary key.
13620 : *
13621 : * Used when the column list in the REFERENCES specification is omitted.
13622 : */
13623 : static int
13624 811 : transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
13625 : List **attnamelist,
13626 : int16 *attnums, Oid *atttypids, Oid *attcollids,
13627 : Oid *opclasses, bool *pk_has_without_overlaps)
13628 : {
13629 : List *indexoidlist;
13630 : ListCell *indexoidscan;
13631 811 : HeapTuple indexTuple = NULL;
13632 811 : Form_pg_index indexStruct = NULL;
13633 : Datum indclassDatum;
13634 : oidvector *indclass;
13635 : int i;
13636 :
13637 : /*
13638 : * Get the list of index OIDs for the table from the relcache, and look up
13639 : * each one in the pg_index syscache until we find one marked primary key
13640 : * (hopefully there isn't more than one such). Insist it's valid, too.
13641 : */
13642 811 : *indexOid = InvalidOid;
13643 :
13644 811 : indexoidlist = RelationGetIndexList(pkrel);
13645 :
13646 815 : foreach(indexoidscan, indexoidlist)
13647 : {
13648 815 : Oid indexoid = lfirst_oid(indexoidscan);
13649 :
13650 815 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13651 815 : if (!HeapTupleIsValid(indexTuple))
13652 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13653 815 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13654 815 : if (indexStruct->indisprimary && indexStruct->indisvalid)
13655 : {
13656 : /*
13657 : * Refuse to use a deferrable primary key. This is per SQL spec,
13658 : * and there would be a lot of interesting semantic problems if we
13659 : * tried to allow it.
13660 : */
13661 811 : if (!indexStruct->indimmediate)
13662 0 : ereport(ERROR,
13663 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13664 : errmsg("cannot use a deferrable primary key for referenced table \"%s\"",
13665 : RelationGetRelationName(pkrel))));
13666 :
13667 811 : *indexOid = indexoid;
13668 811 : break;
13669 : }
13670 4 : ReleaseSysCache(indexTuple);
13671 : }
13672 :
13673 811 : list_free(indexoidlist);
13674 :
13675 : /*
13676 : * Check that we found it
13677 : */
13678 811 : if (!OidIsValid(*indexOid))
13679 0 : ereport(ERROR,
13680 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13681 : errmsg("there is no primary key for referenced table \"%s\"",
13682 : RelationGetRelationName(pkrel))));
13683 :
13684 : /* Must get indclass the hard way */
13685 811 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13686 : Anum_pg_index_indclass);
13687 811 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13688 :
13689 : /*
13690 : * Now build the list of PK attributes from the indkey definition (we
13691 : * assume a primary key cannot have expressional elements)
13692 : */
13693 811 : *attnamelist = NIL;
13694 1934 : for (i = 0; i < indexStruct->indnkeyatts; i++)
13695 : {
13696 1123 : int pkattno = indexStruct->indkey.values[i];
13697 :
13698 1123 : attnums[i] = pkattno;
13699 1123 : atttypids[i] = attnumTypeId(pkrel, pkattno);
13700 1123 : attcollids[i] = attnumCollationId(pkrel, pkattno);
13701 1123 : opclasses[i] = indclass->values[i];
13702 1123 : *attnamelist = lappend(*attnamelist,
13703 1123 : makeString(pstrdup(NameStr(*attnumAttName(pkrel, pkattno)))));
13704 : }
13705 :
13706 811 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13707 :
13708 811 : ReleaseSysCache(indexTuple);
13709 :
13710 811 : return i;
13711 : }
13712 :
13713 : /*
13714 : * transformFkeyCheckAttrs -
13715 : *
13716 : * Validate that the 'attnums' columns in the 'pkrel' relation are valid to
13717 : * reference as part of a foreign key constraint.
13718 : *
13719 : * Returns the OID of the unique index supporting the constraint and
13720 : * populates the caller-provided 'opclasses' array with the opclasses
13721 : * associated with the index columns. Also sets whether the index
13722 : * uses WITHOUT OVERLAPS.
13723 : *
13724 : * Raises an ERROR on validation failure.
13725 : */
13726 : static Oid
13727 839 : transformFkeyCheckAttrs(Relation pkrel,
13728 : int numattrs, int16 *attnums,
13729 : bool with_period, Oid *opclasses,
13730 : bool *pk_has_without_overlaps)
13731 : {
13732 839 : Oid indexoid = InvalidOid;
13733 839 : bool found = false;
13734 839 : bool found_deferrable = false;
13735 : List *indexoidlist;
13736 : ListCell *indexoidscan;
13737 : int i,
13738 : j;
13739 :
13740 : /*
13741 : * Reject duplicate appearances of columns in the referenced-columns list.
13742 : * Such a case is forbidden by the SQL standard, and even if we thought it
13743 : * useful to allow it, there would be ambiguity about how to match the
13744 : * list to unique indexes (in particular, it'd be unclear which index
13745 : * opclass goes with which FK column).
13746 : */
13747 1959 : for (i = 0; i < numattrs; i++)
13748 : {
13749 1479 : for (j = i + 1; j < numattrs; j++)
13750 : {
13751 359 : if (attnums[i] == attnums[j])
13752 16 : ereport(ERROR,
13753 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13754 : errmsg("foreign key referenced-columns list must not contain duplicates")));
13755 : }
13756 : }
13757 :
13758 : /*
13759 : * Get the list of index OIDs for the table from the relcache, and look up
13760 : * each one in the pg_index syscache, and match unique indexes to the list
13761 : * of attnums we are given.
13762 : */
13763 823 : indexoidlist = RelationGetIndexList(pkrel);
13764 :
13765 942 : foreach(indexoidscan, indexoidlist)
13766 : {
13767 : HeapTuple indexTuple;
13768 : Form_pg_index indexStruct;
13769 :
13770 934 : indexoid = lfirst_oid(indexoidscan);
13771 934 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13772 934 : if (!HeapTupleIsValid(indexTuple))
13773 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13774 934 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13775 :
13776 : /*
13777 : * Must have the right number of columns; must be unique (or if
13778 : * temporal then exclusion instead) and not a partial index; forget it
13779 : * if there are any expressions, too. Invalid indexes are out as well.
13780 : */
13781 934 : if (indexStruct->indnkeyatts == numattrs &&
13782 853 : (with_period ? indexStruct->indisexclusion : indexStruct->indisunique) &&
13783 1706 : indexStruct->indisvalid &&
13784 1706 : heap_attisnull(indexTuple, Anum_pg_index_indpred, NULL) &&
13785 853 : heap_attisnull(indexTuple, Anum_pg_index_indexprs, NULL))
13786 : {
13787 : Datum indclassDatum;
13788 : oidvector *indclass;
13789 :
13790 : /* Must get indclass the hard way */
13791 853 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13792 : Anum_pg_index_indclass);
13793 853 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13794 :
13795 : /*
13796 : * The given attnum list may match the index columns in any order.
13797 : * Check for a match, and extract the appropriate opclasses while
13798 : * we're at it.
13799 : *
13800 : * We know that attnums[] is duplicate-free per the test at the
13801 : * start of this function, and we checked above that the number of
13802 : * index columns agrees, so if we find a match for each attnums[]
13803 : * entry then we must have a one-to-one match in some order.
13804 : */
13805 1965 : for (i = 0; i < numattrs; i++)
13806 : {
13807 1150 : found = false;
13808 1531 : for (j = 0; j < numattrs; j++)
13809 : {
13810 1493 : if (attnums[i] == indexStruct->indkey.values[j])
13811 : {
13812 1112 : opclasses[i] = indclass->values[j];
13813 1112 : found = true;
13814 1112 : break;
13815 : }
13816 : }
13817 1150 : if (!found)
13818 38 : break;
13819 : }
13820 : /* The last attribute in the index must be the PERIOD FK part */
13821 853 : if (found && with_period)
13822 : {
13823 80 : int16 periodattnum = attnums[numattrs - 1];
13824 :
13825 80 : found = (periodattnum == indexStruct->indkey.values[numattrs - 1]);
13826 : }
13827 :
13828 : /*
13829 : * Refuse to use a deferrable unique/primary key. This is per SQL
13830 : * spec, and there would be a lot of interesting semantic problems
13831 : * if we tried to allow it.
13832 : */
13833 853 : if (found && !indexStruct->indimmediate)
13834 : {
13835 : /*
13836 : * Remember that we found an otherwise matching index, so that
13837 : * we can generate a more appropriate error message.
13838 : */
13839 0 : found_deferrable = true;
13840 0 : found = false;
13841 : }
13842 :
13843 : /* We need to know whether the index has WITHOUT OVERLAPS */
13844 853 : if (found)
13845 815 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13846 : }
13847 934 : ReleaseSysCache(indexTuple);
13848 934 : if (found)
13849 815 : break;
13850 : }
13851 :
13852 823 : if (!found)
13853 : {
13854 8 : if (found_deferrable)
13855 0 : ereport(ERROR,
13856 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13857 : errmsg("cannot use a deferrable unique constraint for referenced table \"%s\"",
13858 : RelationGetRelationName(pkrel))));
13859 : else
13860 8 : ereport(ERROR,
13861 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13862 : errmsg("there is no unique constraint matching given keys for referenced table \"%s\"",
13863 : RelationGetRelationName(pkrel))));
13864 : }
13865 :
13866 815 : list_free(indexoidlist);
13867 :
13868 815 : return indexoid;
13869 : }
13870 :
13871 : /*
13872 : * findFkeyCast -
13873 : *
13874 : * Wrapper around find_coercion_pathway() for ATAddForeignKeyConstraint().
13875 : * Caller has equal regard for binary coercibility and for an exact match.
13876 : */
13877 : static CoercionPathType
13878 8 : findFkeyCast(Oid targetTypeId, Oid sourceTypeId, Oid *funcid)
13879 : {
13880 : CoercionPathType ret;
13881 :
13882 8 : if (targetTypeId == sourceTypeId)
13883 : {
13884 8 : ret = COERCION_PATH_RELABELTYPE;
13885 8 : *funcid = InvalidOid;
13886 : }
13887 : else
13888 : {
13889 0 : ret = find_coercion_pathway(targetTypeId, sourceTypeId,
13890 : COERCION_IMPLICIT, funcid);
13891 0 : if (ret == COERCION_PATH_NONE)
13892 : /* A previously-relied-upon cast is now gone. */
13893 0 : elog(ERROR, "could not find cast from %u to %u",
13894 : sourceTypeId, targetTypeId);
13895 : }
13896 :
13897 8 : return ret;
13898 : }
13899 :
13900 : /*
13901 : * Permissions checks on the referenced table for ADD FOREIGN KEY
13902 : *
13903 : * Note: we have already checked that the user owns the referencing table,
13904 : * else we'd have failed much earlier; no additional checks are needed for it.
13905 : */
13906 : static void
13907 1602 : checkFkeyPermissions(Relation rel, int16 *attnums, int natts)
13908 : {
13909 1602 : Oid roleid = GetUserId();
13910 : AclResult aclresult;
13911 : int i;
13912 :
13913 : /* Okay if we have relation-level REFERENCES permission */
13914 1602 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), roleid,
13915 : ACL_REFERENCES);
13916 1602 : if (aclresult == ACLCHECK_OK)
13917 1602 : return;
13918 : /* Else we must have REFERENCES on each column */
13919 0 : for (i = 0; i < natts; i++)
13920 : {
13921 0 : aclresult = pg_attribute_aclcheck(RelationGetRelid(rel), attnums[i],
13922 : roleid, ACL_REFERENCES);
13923 0 : if (aclresult != ACLCHECK_OK)
13924 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
13925 0 : RelationGetRelationName(rel));
13926 : }
13927 : }
13928 :
13929 : /*
13930 : * Scan the existing rows in a table to verify they meet a proposed FK
13931 : * constraint.
13932 : *
13933 : * Caller must have opened and locked both relations appropriately.
13934 : */
13935 : static void
13936 734 : validateForeignKeyConstraint(char *conname,
13937 : Relation rel,
13938 : Relation pkrel,
13939 : Oid pkindOid,
13940 : Oid constraintOid,
13941 : bool hasperiod)
13942 : {
13943 : TupleTableSlot *slot;
13944 : TableScanDesc scan;
13945 734 : Trigger trig = {0};
13946 : Snapshot snapshot;
13947 : MemoryContext oldcxt;
13948 : MemoryContext perTupCxt;
13949 :
13950 734 : ereport(DEBUG1,
13951 : (errmsg_internal("validating foreign key constraint \"%s\"", conname)));
13952 :
13953 : /*
13954 : * Build a trigger call structure; we'll need it either way.
13955 : */
13956 734 : trig.tgoid = InvalidOid;
13957 734 : trig.tgname = conname;
13958 734 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
13959 734 : trig.tgisinternal = true;
13960 734 : trig.tgconstrrelid = RelationGetRelid(pkrel);
13961 734 : trig.tgconstrindid = pkindOid;
13962 734 : trig.tgconstraint = constraintOid;
13963 734 : trig.tgdeferrable = false;
13964 734 : trig.tginitdeferred = false;
13965 : /* we needn't fill in remaining fields */
13966 :
13967 : /*
13968 : * See if we can do it with a single LEFT JOIN query. A false result
13969 : * indicates we must proceed with the fire-the-trigger method. We can't do
13970 : * a LEFT JOIN for temporal FKs yet, but we can once we support temporal
13971 : * left joins.
13972 : */
13973 734 : if (!hasperiod && RI_Initial_Check(&trig, rel, pkrel))
13974 608 : return;
13975 :
13976 : /*
13977 : * Scan through each tuple, calling RI_FKey_check_ins (insert trigger) as
13978 : * if that tuple had just been inserted. If any of those fail, it should
13979 : * ereport(ERROR) and that's that.
13980 : */
13981 71 : snapshot = RegisterSnapshot(GetLatestSnapshot());
13982 71 : slot = table_slot_create(rel, NULL);
13983 71 : scan = table_beginscan(rel, snapshot, 0, NULL);
13984 :
13985 71 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
13986 : "validateForeignKeyConstraint",
13987 : ALLOCSET_SMALL_SIZES);
13988 71 : oldcxt = MemoryContextSwitchTo(perTupCxt);
13989 :
13990 127 : while (table_scan_getnextslot(scan, ForwardScanDirection, slot))
13991 : {
13992 68 : LOCAL_FCINFO(fcinfo, 0);
13993 68 : TriggerData trigdata = {0};
13994 :
13995 68 : CHECK_FOR_INTERRUPTS();
13996 :
13997 : /*
13998 : * Make a call to the trigger function
13999 : *
14000 : * No parameters are passed, but we do set a context
14001 : */
14002 340 : MemSet(fcinfo, 0, SizeForFunctionCallInfo(0));
14003 :
14004 : /*
14005 : * We assume RI_FKey_check_ins won't look at flinfo...
14006 : */
14007 68 : trigdata.type = T_TriggerData;
14008 68 : trigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
14009 68 : trigdata.tg_relation = rel;
14010 68 : trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, false, NULL);
14011 68 : trigdata.tg_trigslot = slot;
14012 68 : trigdata.tg_trigger = &trig;
14013 :
14014 68 : fcinfo->context = (Node *) &trigdata;
14015 :
14016 68 : RI_FKey_check_ins(fcinfo);
14017 :
14018 56 : MemoryContextReset(perTupCxt);
14019 : }
14020 :
14021 59 : MemoryContextSwitchTo(oldcxt);
14022 59 : MemoryContextDelete(perTupCxt);
14023 59 : table_endscan(scan);
14024 59 : UnregisterSnapshot(snapshot);
14025 59 : ExecDropSingleTupleTableSlot(slot);
14026 : }
14027 :
14028 : /*
14029 : * CreateFKCheckTrigger
14030 : * Creates the insert (on_insert=true) or update "check" trigger that
14031 : * implements a given foreign key
14032 : *
14033 : * Returns the OID of the so created trigger.
14034 : */
14035 : static Oid
14036 3924 : CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
14037 : Oid constraintOid, Oid indexOid, Oid parentTrigOid,
14038 : bool on_insert)
14039 : {
14040 : ObjectAddress trigAddress;
14041 : CreateTrigStmt *fk_trigger;
14042 :
14043 : /*
14044 : * Note: for a self-referential FK (referencing and referenced tables are
14045 : * the same), it is important that the ON UPDATE action fires before the
14046 : * CHECK action, since both triggers will fire on the same row during an
14047 : * UPDATE event; otherwise the CHECK trigger will be checking a non-final
14048 : * state of the row. Triggers fire in name order, so we ensure this by
14049 : * using names like "RI_ConstraintTrigger_a_NNNN" for the action triggers
14050 : * and "RI_ConstraintTrigger_c_NNNN" for the check triggers.
14051 : */
14052 3924 : fk_trigger = makeNode(CreateTrigStmt);
14053 3924 : fk_trigger->replace = false;
14054 3924 : fk_trigger->isconstraint = true;
14055 3924 : fk_trigger->trigname = "RI_ConstraintTrigger_c";
14056 3924 : fk_trigger->relation = NULL;
14057 :
14058 : /* Either ON INSERT or ON UPDATE */
14059 3924 : if (on_insert)
14060 : {
14061 1962 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
14062 1962 : fk_trigger->events = TRIGGER_TYPE_INSERT;
14063 : }
14064 : else
14065 : {
14066 1962 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
14067 1962 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
14068 : }
14069 :
14070 3924 : fk_trigger->args = NIL;
14071 3924 : fk_trigger->row = true;
14072 3924 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14073 3924 : fk_trigger->columns = NIL;
14074 3924 : fk_trigger->whenClause = NULL;
14075 3924 : fk_trigger->transitionRels = NIL;
14076 3924 : fk_trigger->deferrable = fkconstraint->deferrable;
14077 3924 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14078 3924 : fk_trigger->constrrel = NULL;
14079 :
14080 3924 : trigAddress = CreateTrigger(fk_trigger, NULL, myRelOid, refRelOid,
14081 : constraintOid, indexOid, InvalidOid,
14082 : parentTrigOid, NULL, true, false);
14083 :
14084 : /* Make changes-so-far visible */
14085 3924 : CommandCounterIncrement();
14086 :
14087 3924 : return trigAddress.objectId;
14088 : }
14089 :
14090 : /*
14091 : * createForeignKeyActionTriggers
14092 : * Create the referenced-side "action" triggers that implement a foreign
14093 : * key.
14094 : *
14095 : * Returns the OIDs of the so created triggers in *deleteTrigOid and
14096 : * *updateTrigOid.
14097 : */
14098 : static void
14099 2249 : createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
14100 : Oid constraintOid, Oid indexOid,
14101 : Oid parentDelTrigger, Oid parentUpdTrigger,
14102 : Oid *deleteTrigOid, Oid *updateTrigOid)
14103 : {
14104 : CreateTrigStmt *fk_trigger;
14105 : ObjectAddress trigAddress;
14106 :
14107 : /*
14108 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
14109 : * DELETE action on the referenced table.
14110 : */
14111 2249 : fk_trigger = makeNode(CreateTrigStmt);
14112 2249 : fk_trigger->replace = false;
14113 2249 : fk_trigger->isconstraint = true;
14114 2249 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
14115 2249 : fk_trigger->relation = NULL;
14116 2249 : fk_trigger->args = NIL;
14117 2249 : fk_trigger->row = true;
14118 2249 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14119 2249 : fk_trigger->events = TRIGGER_TYPE_DELETE;
14120 2249 : fk_trigger->columns = NIL;
14121 2249 : fk_trigger->whenClause = NULL;
14122 2249 : fk_trigger->transitionRels = NIL;
14123 2249 : fk_trigger->constrrel = NULL;
14124 :
14125 2249 : switch (fkconstraint->fk_del_action)
14126 : {
14127 1820 : case FKCONSTR_ACTION_NOACTION:
14128 1820 : fk_trigger->deferrable = fkconstraint->deferrable;
14129 1820 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14130 1820 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_del");
14131 1820 : break;
14132 20 : case FKCONSTR_ACTION_RESTRICT:
14133 20 : fk_trigger->deferrable = false;
14134 20 : fk_trigger->initdeferred = false;
14135 20 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_del");
14136 20 : break;
14137 306 : case FKCONSTR_ACTION_CASCADE:
14138 306 : fk_trigger->deferrable = false;
14139 306 : fk_trigger->initdeferred = false;
14140 306 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_del");
14141 306 : break;
14142 63 : case FKCONSTR_ACTION_SETNULL:
14143 63 : fk_trigger->deferrable = false;
14144 63 : fk_trigger->initdeferred = false;
14145 63 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_del");
14146 63 : break;
14147 40 : case FKCONSTR_ACTION_SETDEFAULT:
14148 40 : fk_trigger->deferrable = false;
14149 40 : fk_trigger->initdeferred = false;
14150 40 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_del");
14151 40 : break;
14152 0 : default:
14153 0 : elog(ERROR, "unrecognized FK action type: %d",
14154 : (int) fkconstraint->fk_del_action);
14155 : break;
14156 : }
14157 :
14158 2249 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
14159 : constraintOid, indexOid, InvalidOid,
14160 : parentDelTrigger, NULL, true, false);
14161 2249 : if (deleteTrigOid)
14162 2249 : *deleteTrigOid = trigAddress.objectId;
14163 :
14164 : /* Make changes-so-far visible */
14165 2249 : CommandCounterIncrement();
14166 :
14167 : /*
14168 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
14169 : * UPDATE action on the referenced table.
14170 : */
14171 2249 : fk_trigger = makeNode(CreateTrigStmt);
14172 2249 : fk_trigger->replace = false;
14173 2249 : fk_trigger->isconstraint = true;
14174 2249 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
14175 2249 : fk_trigger->relation = NULL;
14176 2249 : fk_trigger->args = NIL;
14177 2249 : fk_trigger->row = true;
14178 2249 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
14179 2249 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
14180 2249 : fk_trigger->columns = NIL;
14181 2249 : fk_trigger->whenClause = NULL;
14182 2249 : fk_trigger->transitionRels = NIL;
14183 2249 : fk_trigger->constrrel = NULL;
14184 :
14185 2249 : switch (fkconstraint->fk_upd_action)
14186 : {
14187 1945 : case FKCONSTR_ACTION_NOACTION:
14188 1945 : fk_trigger->deferrable = fkconstraint->deferrable;
14189 1945 : fk_trigger->initdeferred = fkconstraint->initdeferred;
14190 1945 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_upd");
14191 1945 : break;
14192 24 : case FKCONSTR_ACTION_RESTRICT:
14193 24 : fk_trigger->deferrable = false;
14194 24 : fk_trigger->initdeferred = false;
14195 24 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_upd");
14196 24 : break;
14197 211 : case FKCONSTR_ACTION_CASCADE:
14198 211 : fk_trigger->deferrable = false;
14199 211 : fk_trigger->initdeferred = false;
14200 211 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_upd");
14201 211 : break;
14202 41 : case FKCONSTR_ACTION_SETNULL:
14203 41 : fk_trigger->deferrable = false;
14204 41 : fk_trigger->initdeferred = false;
14205 41 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_upd");
14206 41 : break;
14207 28 : case FKCONSTR_ACTION_SETDEFAULT:
14208 28 : fk_trigger->deferrable = false;
14209 28 : fk_trigger->initdeferred = false;
14210 28 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_upd");
14211 28 : break;
14212 0 : default:
14213 0 : elog(ERROR, "unrecognized FK action type: %d",
14214 : (int) fkconstraint->fk_upd_action);
14215 : break;
14216 : }
14217 :
14218 2249 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
14219 : constraintOid, indexOid, InvalidOid,
14220 : parentUpdTrigger, NULL, true, false);
14221 2249 : if (updateTrigOid)
14222 2249 : *updateTrigOid = trigAddress.objectId;
14223 2249 : }
14224 :
14225 : /*
14226 : * createForeignKeyCheckTriggers
14227 : * Create the referencing-side "check" triggers that implement a foreign
14228 : * key.
14229 : *
14230 : * Returns the OIDs of the so created triggers in *insertTrigOid and
14231 : * *updateTrigOid.
14232 : */
14233 : static void
14234 1962 : createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
14235 : Constraint *fkconstraint, Oid constraintOid,
14236 : Oid indexOid,
14237 : Oid parentInsTrigger, Oid parentUpdTrigger,
14238 : Oid *insertTrigOid, Oid *updateTrigOid)
14239 : {
14240 1962 : *insertTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
14241 : constraintOid, indexOid,
14242 : parentInsTrigger, true);
14243 1962 : *updateTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
14244 : constraintOid, indexOid,
14245 : parentUpdTrigger, false);
14246 1962 : }
14247 :
14248 : /*
14249 : * ALTER TABLE DROP CONSTRAINT
14250 : *
14251 : * Like DROP COLUMN, we can't use the normal ALTER TABLE recursion mechanism.
14252 : */
14253 : static void
14254 549 : ATExecDropConstraint(Relation rel, const char *constrName,
14255 : DropBehavior behavior, bool recurse,
14256 : bool missing_ok, LOCKMODE lockmode)
14257 : {
14258 : Relation conrel;
14259 : SysScanDesc scan;
14260 : ScanKeyData skey[3];
14261 : HeapTuple tuple;
14262 549 : bool found = false;
14263 :
14264 549 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14265 :
14266 : /*
14267 : * Find and drop the target constraint
14268 : */
14269 549 : ScanKeyInit(&skey[0],
14270 : Anum_pg_constraint_conrelid,
14271 : BTEqualStrategyNumber, F_OIDEQ,
14272 : ObjectIdGetDatum(RelationGetRelid(rel)));
14273 549 : ScanKeyInit(&skey[1],
14274 : Anum_pg_constraint_contypid,
14275 : BTEqualStrategyNumber, F_OIDEQ,
14276 : ObjectIdGetDatum(InvalidOid));
14277 549 : ScanKeyInit(&skey[2],
14278 : Anum_pg_constraint_conname,
14279 : BTEqualStrategyNumber, F_NAMEEQ,
14280 : CStringGetDatum(constrName));
14281 549 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14282 : true, NULL, 3, skey);
14283 :
14284 : /* There can be at most one matching row */
14285 549 : if (HeapTupleIsValid(tuple = systable_getnext(scan)))
14286 : {
14287 525 : dropconstraint_internal(rel, tuple, behavior, recurse, false,
14288 : missing_ok, lockmode);
14289 401 : found = true;
14290 : }
14291 :
14292 425 : systable_endscan(scan);
14293 :
14294 425 : if (!found)
14295 : {
14296 24 : if (!missing_ok)
14297 16 : ereport(ERROR,
14298 : errcode(ERRCODE_UNDEFINED_OBJECT),
14299 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14300 : constrName, RelationGetRelationName(rel)));
14301 : else
14302 8 : ereport(NOTICE,
14303 : errmsg("constraint \"%s\" of relation \"%s\" does not exist, skipping",
14304 : constrName, RelationGetRelationName(rel)));
14305 : }
14306 :
14307 409 : table_close(conrel, RowExclusiveLock);
14308 409 : }
14309 :
14310 : /*
14311 : * Remove a constraint, using its pg_constraint tuple
14312 : *
14313 : * Implementation for ALTER TABLE DROP CONSTRAINT and ALTER TABLE ALTER COLUMN
14314 : * DROP NOT NULL.
14315 : *
14316 : * Returns the address of the constraint being removed.
14317 : */
14318 : static ObjectAddress
14319 829 : dropconstraint_internal(Relation rel, HeapTuple constraintTup, DropBehavior behavior,
14320 : bool recurse, bool recursing, bool missing_ok,
14321 : LOCKMODE lockmode)
14322 : {
14323 : Relation conrel;
14324 : Form_pg_constraint con;
14325 : ObjectAddress conobj;
14326 : List *children;
14327 829 : bool is_no_inherit_constraint = false;
14328 : char *constrName;
14329 829 : char *colname = NULL;
14330 :
14331 : /* Guard against stack overflow due to overly deep inheritance tree. */
14332 829 : check_stack_depth();
14333 :
14334 : /* At top level, permission check was done in ATPrepCmd, else do it */
14335 829 : if (recursing)
14336 159 : ATSimplePermissions(AT_DropConstraint, rel,
14337 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
14338 :
14339 825 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14340 :
14341 825 : con = (Form_pg_constraint) GETSTRUCT(constraintTup);
14342 825 : constrName = NameStr(con->conname);
14343 :
14344 : /* Don't allow drop of inherited constraints */
14345 825 : if (con->coninhcount > 0 && !recursing)
14346 104 : ereport(ERROR,
14347 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14348 : errmsg("cannot drop inherited constraint \"%s\" of relation \"%s\"",
14349 : constrName, RelationGetRelationName(rel))));
14350 :
14351 : /*
14352 : * Reset pg_constraint.attnotnull, if this is a not-null constraint.
14353 : *
14354 : * While doing that, we're in a good position to disallow dropping a not-
14355 : * null constraint underneath a primary key, a replica identity index, or
14356 : * a generated identity column.
14357 : */
14358 721 : if (con->contype == CONSTRAINT_NOTNULL)
14359 : {
14360 207 : Relation attrel = table_open(AttributeRelationId, RowExclusiveLock);
14361 207 : AttrNumber attnum = extractNotNullColumn(constraintTup);
14362 : Bitmapset *pkattrs;
14363 : Bitmapset *irattrs;
14364 : HeapTuple atttup;
14365 : Form_pg_attribute attForm;
14366 :
14367 : /* save column name for recursion step */
14368 207 : colname = get_attname(RelationGetRelid(rel), attnum, false);
14369 :
14370 : /*
14371 : * Disallow if it's in the primary key. For partitioned tables we
14372 : * cannot rely solely on RelationGetIndexAttrBitmap, because it'll
14373 : * return NULL if the primary key is invalid; but we still need to
14374 : * protect not-null constraints under such a constraint, so check the
14375 : * slow way.
14376 : */
14377 207 : pkattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_PRIMARY_KEY);
14378 :
14379 207 : if (pkattrs == NULL &&
14380 183 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14381 : {
14382 12 : Oid pkindex = RelationGetPrimaryKeyIndex(rel, true);
14383 :
14384 12 : if (OidIsValid(pkindex))
14385 : {
14386 0 : Relation pk = relation_open(pkindex, AccessShareLock);
14387 :
14388 0 : pkattrs = NULL;
14389 0 : for (int i = 0; i < pk->rd_index->indnkeyatts; i++)
14390 0 : pkattrs = bms_add_member(pkattrs, pk->rd_index->indkey.values[i]);
14391 :
14392 0 : relation_close(pk, AccessShareLock);
14393 : }
14394 : }
14395 :
14396 231 : if (pkattrs &&
14397 24 : bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, pkattrs))
14398 16 : ereport(ERROR,
14399 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14400 : errmsg("column \"%s\" is in a primary key",
14401 : get_attname(RelationGetRelid(rel), attnum, false)));
14402 :
14403 : /* Disallow if it's in the replica identity */
14404 191 : irattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_IDENTITY_KEY);
14405 191 : if (bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, irattrs))
14406 8 : ereport(ERROR,
14407 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14408 : errmsg("column \"%s\" is in index used as replica identity",
14409 : get_attname(RelationGetRelid(rel), attnum, false)));
14410 :
14411 : /* Disallow if it's a GENERATED AS IDENTITY column */
14412 183 : atttup = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
14413 183 : if (!HeapTupleIsValid(atttup))
14414 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
14415 : attnum, RelationGetRelid(rel));
14416 183 : attForm = (Form_pg_attribute) GETSTRUCT(atttup);
14417 183 : if (attForm->attidentity != '\0')
14418 0 : ereport(ERROR,
14419 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
14420 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
14421 : get_attname(RelationGetRelid(rel), attnum,
14422 : false),
14423 : RelationGetRelationName(rel)));
14424 :
14425 : /* All good -- reset attnotnull if needed */
14426 183 : if (attForm->attnotnull)
14427 : {
14428 183 : attForm->attnotnull = false;
14429 183 : CatalogTupleUpdate(attrel, &atttup->t_self, atttup);
14430 : }
14431 :
14432 183 : table_close(attrel, RowExclusiveLock);
14433 : }
14434 :
14435 697 : is_no_inherit_constraint = con->connoinherit;
14436 :
14437 : /*
14438 : * If it's a foreign-key constraint, we'd better lock the referenced table
14439 : * and check that that's not in use, just as we've already done for the
14440 : * constrained table (else we might, eg, be dropping a trigger that has
14441 : * unfired events). But we can/must skip that in the self-referential
14442 : * case.
14443 : */
14444 697 : if (con->contype == CONSTRAINT_FOREIGN &&
14445 112 : con->confrelid != RelationGetRelid(rel))
14446 : {
14447 : Relation frel;
14448 :
14449 : /* Must match lock taken by RemoveTriggerById: */
14450 112 : frel = table_open(con->confrelid, AccessExclusiveLock);
14451 112 : CheckAlterTableIsSafe(frel);
14452 108 : table_close(frel, NoLock);
14453 : }
14454 :
14455 : /*
14456 : * Perform the actual constraint deletion
14457 : */
14458 693 : ObjectAddressSet(conobj, ConstraintRelationId, con->oid);
14459 693 : performDeletion(&conobj, behavior, 0);
14460 :
14461 : /*
14462 : * For partitioned tables, non-CHECK, non-NOT-NULL inherited constraints
14463 : * are dropped via the dependency mechanism, so we're done here.
14464 : */
14465 669 : if (con->contype != CONSTRAINT_CHECK &&
14466 416 : con->contype != CONSTRAINT_NOTNULL &&
14467 233 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14468 : {
14469 52 : table_close(conrel, RowExclusiveLock);
14470 52 : return conobj;
14471 : }
14472 :
14473 : /*
14474 : * Propagate to children as appropriate. Unlike most other ALTER
14475 : * routines, we have to do this one level of recursion at a time; we can't
14476 : * use find_all_inheritors to do it in one pass.
14477 : */
14478 617 : if (!is_no_inherit_constraint)
14479 428 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
14480 : else
14481 189 : children = NIL;
14482 :
14483 1509 : foreach_oid(childrelid, children)
14484 : {
14485 : Relation childrel;
14486 : HeapTuple tuple;
14487 : Form_pg_constraint childcon;
14488 :
14489 : /* find_inheritance_children already got lock */
14490 283 : childrel = table_open(childrelid, NoLock);
14491 283 : CheckAlterTableIsSafe(childrel);
14492 :
14493 : /*
14494 : * We search for not-null constraints by column name, and others by
14495 : * constraint name.
14496 : */
14497 283 : if (con->contype == CONSTRAINT_NOTNULL)
14498 : {
14499 98 : tuple = findNotNullConstraint(childrelid, colname);
14500 98 : if (!HeapTupleIsValid(tuple))
14501 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
14502 : colname, RelationGetRelid(childrel));
14503 : }
14504 : else
14505 : {
14506 : SysScanDesc scan;
14507 : ScanKeyData skey[3];
14508 :
14509 185 : ScanKeyInit(&skey[0],
14510 : Anum_pg_constraint_conrelid,
14511 : BTEqualStrategyNumber, F_OIDEQ,
14512 : ObjectIdGetDatum(childrelid));
14513 185 : ScanKeyInit(&skey[1],
14514 : Anum_pg_constraint_contypid,
14515 : BTEqualStrategyNumber, F_OIDEQ,
14516 : ObjectIdGetDatum(InvalidOid));
14517 185 : ScanKeyInit(&skey[2],
14518 : Anum_pg_constraint_conname,
14519 : BTEqualStrategyNumber, F_NAMEEQ,
14520 : CStringGetDatum(constrName));
14521 185 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14522 : true, NULL, 3, skey);
14523 : /* There can only be one, so no need to loop */
14524 185 : tuple = systable_getnext(scan);
14525 185 : if (!HeapTupleIsValid(tuple))
14526 0 : ereport(ERROR,
14527 : (errcode(ERRCODE_UNDEFINED_OBJECT),
14528 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14529 : constrName,
14530 : RelationGetRelationName(childrel))));
14531 185 : tuple = heap_copytuple(tuple);
14532 185 : systable_endscan(scan);
14533 : }
14534 :
14535 283 : childcon = (Form_pg_constraint) GETSTRUCT(tuple);
14536 :
14537 : /* Right now only CHECK and not-null constraints can be inherited */
14538 283 : if (childcon->contype != CONSTRAINT_CHECK &&
14539 98 : childcon->contype != CONSTRAINT_NOTNULL)
14540 0 : elog(ERROR, "inherited constraint is not a CHECK or not-null constraint");
14541 :
14542 283 : if (childcon->coninhcount <= 0) /* shouldn't happen */
14543 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
14544 : childrelid, NameStr(childcon->conname));
14545 :
14546 283 : if (recurse)
14547 : {
14548 : /*
14549 : * If the child constraint has other definition sources, just
14550 : * decrement its inheritance count; if not, recurse to delete it.
14551 : */
14552 215 : if (childcon->coninhcount == 1 && !childcon->conislocal)
14553 : {
14554 : /* Time to delete this child constraint, too */
14555 159 : dropconstraint_internal(childrel, tuple, behavior,
14556 : recurse, true, missing_ok,
14557 : lockmode);
14558 : }
14559 : else
14560 : {
14561 : /* Child constraint must survive my deletion */
14562 56 : childcon->coninhcount--;
14563 56 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14564 :
14565 : /* Make update visible */
14566 56 : CommandCounterIncrement();
14567 : }
14568 : }
14569 : else
14570 : {
14571 : /*
14572 : * If we were told to drop ONLY in this table (no recursion) and
14573 : * there are no further parents for this constraint, we need to
14574 : * mark the inheritors' constraints as locally defined rather than
14575 : * inherited.
14576 : */
14577 68 : childcon->coninhcount--;
14578 68 : if (childcon->coninhcount == 0)
14579 68 : childcon->conislocal = true;
14580 :
14581 68 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14582 :
14583 : /* Make update visible */
14584 68 : CommandCounterIncrement();
14585 : }
14586 :
14587 279 : heap_freetuple(tuple);
14588 :
14589 279 : table_close(childrel, NoLock);
14590 : }
14591 :
14592 613 : table_close(conrel, RowExclusiveLock);
14593 :
14594 613 : return conobj;
14595 : }
14596 :
14597 : /*
14598 : * ALTER COLUMN TYPE
14599 : *
14600 : * Unlike other subcommand types, we do parse transformation for ALTER COLUMN
14601 : * TYPE during phase 1 --- the AlterTableCmd passed in here is already
14602 : * transformed (and must be, because we rely on some transformed fields).
14603 : *
14604 : * The point of this is that the execution of all ALTER COLUMN TYPEs for a
14605 : * table will be done "in parallel" during phase 3, so all the USING
14606 : * expressions should be parsed assuming the original column types. Also,
14607 : * this allows a USING expression to refer to a field that will be dropped.
14608 : *
14609 : * To make this work safely, AT_PASS_DROP then AT_PASS_ALTER_TYPE must be
14610 : * the first two execution steps in phase 2; they must not see the effects
14611 : * of any other subcommand types, since the USING expressions are parsed
14612 : * against the unmodified table's state.
14613 : */
14614 : static void
14615 936 : ATPrepAlterColumnType(List **wqueue,
14616 : AlteredTableInfo *tab, Relation rel,
14617 : bool recurse, bool recursing,
14618 : AlterTableCmd *cmd, LOCKMODE lockmode,
14619 : AlterTableUtilityContext *context)
14620 : {
14621 936 : char *colName = cmd->name;
14622 936 : ColumnDef *def = (ColumnDef *) cmd->def;
14623 936 : TypeName *typeName = def->typeName;
14624 936 : Node *transform = def->cooked_default;
14625 : HeapTuple tuple;
14626 : Form_pg_attribute attTup;
14627 : AttrNumber attnum;
14628 : Oid targettype;
14629 : int32 targettypmod;
14630 : Oid targetcollid;
14631 : NewColumnValue *newval;
14632 936 : ParseState *pstate = make_parsestate(NULL);
14633 : AclResult aclresult;
14634 : bool is_expr;
14635 :
14636 936 : pstate->p_sourcetext = context->queryString;
14637 :
14638 936 : if (rel->rd_rel->reloftype && !recursing)
14639 4 : ereport(ERROR,
14640 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14641 : errmsg("cannot alter column type of typed table"),
14642 : parser_errposition(pstate, def->location)));
14643 :
14644 : /* lookup the attribute so we can check inheritance status */
14645 932 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
14646 932 : if (!HeapTupleIsValid(tuple))
14647 0 : ereport(ERROR,
14648 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14649 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14650 : colName, RelationGetRelationName(rel)),
14651 : parser_errposition(pstate, def->location)));
14652 932 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
14653 932 : attnum = attTup->attnum;
14654 :
14655 : /* Can't alter a system attribute */
14656 932 : if (attnum <= 0)
14657 4 : ereport(ERROR,
14658 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14659 : errmsg("cannot alter system column \"%s\"", colName),
14660 : parser_errposition(pstate, def->location)));
14661 :
14662 : /*
14663 : * Cannot specify USING when altering type of a generated column, because
14664 : * that would violate the generation expression.
14665 : */
14666 928 : if (attTup->attgenerated && def->cooked_default)
14667 8 : ereport(ERROR,
14668 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
14669 : errmsg("cannot specify USING when altering type of generated column"),
14670 : errdetail("Column \"%s\" is a generated column.", colName),
14671 : parser_errposition(pstate, def->location)));
14672 :
14673 : /*
14674 : * Don't alter inherited columns. At outer level, there had better not be
14675 : * any inherited definition; when recursing, we assume this was checked at
14676 : * the parent level (see below).
14677 : */
14678 920 : if (attTup->attinhcount > 0 && !recursing)
14679 4 : ereport(ERROR,
14680 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14681 : errmsg("cannot alter inherited column \"%s\"", colName),
14682 : parser_errposition(pstate, def->location)));
14683 :
14684 : /* Don't alter columns used in the partition key */
14685 916 : if (has_partition_attrs(rel,
14686 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
14687 : &is_expr))
14688 12 : ereport(ERROR,
14689 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14690 : errmsg("cannot alter column \"%s\" because it is part of the partition key of relation \"%s\"",
14691 : colName, RelationGetRelationName(rel)),
14692 : parser_errposition(pstate, def->location)));
14693 :
14694 : /* Look up the target type */
14695 904 : typenameTypeIdAndMod(pstate, typeName, &targettype, &targettypmod);
14696 :
14697 900 : aclresult = object_aclcheck(TypeRelationId, targettype, GetUserId(), ACL_USAGE);
14698 900 : if (aclresult != ACLCHECK_OK)
14699 8 : aclcheck_error_type(aclresult, targettype);
14700 :
14701 : /* And the collation */
14702 892 : targetcollid = GetColumnDefCollation(pstate, def, targettype);
14703 :
14704 : /* make sure datatype is legal for a column */
14705 1776 : CheckAttributeType(colName, targettype, targetcollid,
14706 888 : list_make1_oid(rel->rd_rel->reltype),
14707 888 : (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
14708 :
14709 880 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14710 : {
14711 : /* do nothing */
14712 : }
14713 856 : else if (tab->relkind == RELKIND_RELATION ||
14714 133 : tab->relkind == RELKIND_PARTITIONED_TABLE)
14715 : {
14716 : /*
14717 : * Set up an expression to transform the old data value to the new
14718 : * type. If a USING option was given, use the expression as
14719 : * transformed by transformAlterTableStmt, else just take the old
14720 : * value and try to coerce it. We do this first so that type
14721 : * incompatibility can be detected before we waste effort, and because
14722 : * we need the expression to be parsed against the original table row
14723 : * type.
14724 : */
14725 767 : if (!transform)
14726 : {
14727 616 : transform = (Node *) makeVar(1, attnum,
14728 : attTup->atttypid, attTup->atttypmod,
14729 : attTup->attcollation,
14730 : 0);
14731 : }
14732 :
14733 767 : transform = coerce_to_target_type(pstate,
14734 : transform, exprType(transform),
14735 : targettype, targettypmod,
14736 : COERCION_ASSIGNMENT,
14737 : COERCE_IMPLICIT_CAST,
14738 : -1);
14739 767 : if (transform == NULL)
14740 : {
14741 : /* error text depends on whether USING was specified or not */
14742 15 : if (def->cooked_default != NULL)
14743 4 : ereport(ERROR,
14744 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14745 : errmsg("result of USING clause for column \"%s\""
14746 : " cannot be cast automatically to type %s",
14747 : colName, format_type_be(targettype)),
14748 : errhint("You might need to add an explicit cast.")));
14749 : else
14750 11 : ereport(ERROR,
14751 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14752 : errmsg("column \"%s\" cannot be cast automatically to type %s",
14753 : colName, format_type_be(targettype)),
14754 : !attTup->attgenerated ?
14755 : /* translator: USING is SQL, don't translate it */
14756 : errhint("You might need to specify \"USING %s::%s\".",
14757 : quote_identifier(colName),
14758 : format_type_with_typemod(targettype,
14759 : targettypmod)) : 0));
14760 : }
14761 :
14762 : /* Fix collations after all else */
14763 752 : assign_expr_collations(pstate, transform);
14764 :
14765 : /* Expand virtual generated columns in the expr. */
14766 752 : transform = expand_generated_columns_in_expr(transform, rel, 1);
14767 :
14768 : /* Plan the expr now so we can accurately assess the need to rewrite. */
14769 752 : transform = (Node *) expression_planner((Expr *) transform);
14770 :
14771 : /*
14772 : * Add a work queue item to make ATRewriteTable update the column
14773 : * contents.
14774 : */
14775 752 : newval = palloc0_object(NewColumnValue);
14776 752 : newval->attnum = attnum;
14777 752 : newval->expr = (Expr *) transform;
14778 752 : newval->is_generated = false;
14779 :
14780 752 : tab->newvals = lappend(tab->newvals, newval);
14781 1372 : if (ATColumnChangeRequiresRewrite(transform, attnum))
14782 620 : tab->rewrite |= AT_REWRITE_COLUMN_REWRITE;
14783 : }
14784 89 : else if (transform)
14785 8 : ereport(ERROR,
14786 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14787 : errmsg("\"%s\" is not a table",
14788 : RelationGetRelationName(rel))));
14789 :
14790 857 : if (!RELKIND_HAS_STORAGE(tab->relkind) || attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14791 : {
14792 : /*
14793 : * For relations or columns without storage, do this check now.
14794 : * Regular tables will check it later when the table is being
14795 : * rewritten.
14796 : */
14797 149 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
14798 : }
14799 :
14800 825 : ReleaseSysCache(tuple);
14801 :
14802 : /*
14803 : * Recurse manually by queueing a new command for each child, if
14804 : * necessary. We cannot apply ATSimpleRecursion here because we need to
14805 : * remap attribute numbers in the USING expression, if any.
14806 : *
14807 : * If we are told not to recurse, there had better not be any child
14808 : * tables; else the alter would put them out of step.
14809 : */
14810 825 : if (recurse)
14811 : {
14812 654 : Oid relid = RelationGetRelid(rel);
14813 : List *child_oids,
14814 : *child_numparents;
14815 : ListCell *lo,
14816 : *li;
14817 :
14818 654 : child_oids = find_all_inheritors(relid, lockmode,
14819 : &child_numparents);
14820 :
14821 : /*
14822 : * find_all_inheritors does the recursive search of the inheritance
14823 : * hierarchy, so all we have to do is process all of the relids in the
14824 : * list that it returns.
14825 : */
14826 1446 : forboth(lo, child_oids, li, child_numparents)
14827 : {
14828 808 : Oid childrelid = lfirst_oid(lo);
14829 808 : int numparents = lfirst_int(li);
14830 : Relation childrel;
14831 : HeapTuple childtuple;
14832 : Form_pg_attribute childattTup;
14833 :
14834 808 : if (childrelid == relid)
14835 654 : continue;
14836 :
14837 : /* find_all_inheritors already got lock */
14838 154 : childrel = relation_open(childrelid, NoLock);
14839 154 : CheckAlterTableIsSafe(childrel);
14840 :
14841 : /*
14842 : * Verify that the child doesn't have any inherited definitions of
14843 : * this column that came from outside this inheritance hierarchy.
14844 : * (renameatt makes a similar test, though in a different way
14845 : * because of its different recursion mechanism.)
14846 : */
14847 154 : childtuple = SearchSysCacheAttName(RelationGetRelid(childrel),
14848 : colName);
14849 154 : if (!HeapTupleIsValid(childtuple))
14850 0 : ereport(ERROR,
14851 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14852 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14853 : colName, RelationGetRelationName(childrel))));
14854 154 : childattTup = (Form_pg_attribute) GETSTRUCT(childtuple);
14855 :
14856 154 : if (childattTup->attinhcount > numparents)
14857 4 : ereport(ERROR,
14858 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14859 : errmsg("cannot alter inherited column \"%s\" of relation \"%s\"",
14860 : colName, RelationGetRelationName(childrel))));
14861 :
14862 150 : ReleaseSysCache(childtuple);
14863 :
14864 : /*
14865 : * Remap the attribute numbers. If no USING expression was
14866 : * specified, there is no need for this step.
14867 : */
14868 150 : if (def->cooked_default)
14869 : {
14870 : AttrMap *attmap;
14871 : bool found_whole_row;
14872 :
14873 : /* create a copy to scribble on */
14874 52 : cmd = copyObject(cmd);
14875 :
14876 52 : attmap = build_attrmap_by_name(RelationGetDescr(childrel),
14877 : RelationGetDescr(rel),
14878 : false);
14879 104 : ((ColumnDef *) cmd->def)->cooked_default =
14880 52 : map_variable_attnos(def->cooked_default,
14881 : 1, 0,
14882 : attmap,
14883 : InvalidOid, &found_whole_row);
14884 52 : if (found_whole_row)
14885 4 : ereport(ERROR,
14886 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14887 : errmsg("cannot convert whole-row table reference"),
14888 : errdetail("USING expression contains a whole-row table reference.")));
14889 48 : pfree(attmap);
14890 : }
14891 146 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
14892 138 : relation_close(childrel, NoLock);
14893 : }
14894 : }
14895 204 : else if (!recursing &&
14896 33 : find_inheritance_children(RelationGetRelid(rel), NoLock) != NIL)
14897 0 : ereport(ERROR,
14898 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14899 : errmsg("type of inherited column \"%s\" must be changed in child tables too",
14900 : colName)));
14901 :
14902 809 : if (tab->relkind == RELKIND_COMPOSITE_TYPE)
14903 33 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
14904 805 : }
14905 :
14906 : /*
14907 : * When the data type of a column is changed, a rewrite might not be required
14908 : * if the new type is sufficiently identical to the old one, and the USING
14909 : * clause isn't trying to insert some other value. It's safe to skip the
14910 : * rewrite in these cases:
14911 : *
14912 : * - the old type is binary coercible to the new type
14913 : * - the new type is an unconstrained domain over the old type
14914 : * - {NEW,OLD} or {OLD,NEW} is {timestamptz,timestamp} and the timezone is UTC
14915 : *
14916 : * In the case of a constrained domain, we could get by with scanning the
14917 : * table and checking the constraint rather than actually rewriting it, but we
14918 : * don't currently try to do that.
14919 : */
14920 : static bool
14921 752 : ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno)
14922 : {
14923 : Assert(expr != NULL);
14924 :
14925 : for (;;)
14926 : {
14927 : /* only one varno, so no need to check that */
14928 828 : if (IsA(expr, Var) && ((Var *) expr)->varattno == varattno)
14929 132 : return false;
14930 696 : else if (IsA(expr, RelabelType))
14931 68 : expr = (Node *) ((RelabelType *) expr)->arg;
14932 628 : else if (IsA(expr, CoerceToDomain))
14933 : {
14934 0 : CoerceToDomain *d = (CoerceToDomain *) expr;
14935 :
14936 0 : if (DomainHasConstraints(d->resulttype, NULL))
14937 0 : return true;
14938 0 : expr = (Node *) d->arg;
14939 : }
14940 628 : else if (IsA(expr, FuncExpr))
14941 : {
14942 495 : FuncExpr *f = (FuncExpr *) expr;
14943 :
14944 495 : switch (f->funcid)
14945 : {
14946 12 : case F_TIMESTAMPTZ_TIMESTAMP:
14947 : case F_TIMESTAMP_TIMESTAMPTZ:
14948 12 : if (TimestampTimestampTzRequiresRewrite())
14949 4 : return true;
14950 : else
14951 8 : expr = linitial(f->args);
14952 8 : break;
14953 483 : default:
14954 483 : return true;
14955 : }
14956 : }
14957 : else
14958 133 : return true;
14959 : }
14960 : }
14961 :
14962 : /*
14963 : * ALTER COLUMN .. SET DATA TYPE
14964 : *
14965 : * Return the address of the modified column.
14966 : */
14967 : static ObjectAddress
14968 781 : ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
14969 : AlterTableCmd *cmd, LOCKMODE lockmode)
14970 : {
14971 781 : char *colName = cmd->name;
14972 781 : ColumnDef *def = (ColumnDef *) cmd->def;
14973 781 : TypeName *typeName = def->typeName;
14974 : HeapTuple heapTup;
14975 : Form_pg_attribute attTup,
14976 : attOldTup;
14977 : AttrNumber attnum;
14978 : HeapTuple typeTuple;
14979 : Form_pg_type tform;
14980 : Oid targettype;
14981 : int32 targettypmod;
14982 : Oid targetcollid;
14983 : Node *defaultexpr;
14984 : Relation attrelation;
14985 : Relation depRel;
14986 : ScanKeyData key[3];
14987 : SysScanDesc scan;
14988 : HeapTuple depTup;
14989 : ObjectAddress address;
14990 :
14991 : /*
14992 : * Clear all the missing values if we're rewriting the table, since this
14993 : * renders them pointless.
14994 : */
14995 781 : if (tab->rewrite)
14996 : {
14997 : Relation newrel;
14998 :
14999 580 : newrel = table_open(RelationGetRelid(rel), NoLock);
15000 580 : RelationClearMissing(newrel);
15001 580 : relation_close(newrel, NoLock);
15002 : /* make sure we don't conflict with later attribute modifications */
15003 580 : CommandCounterIncrement();
15004 : }
15005 :
15006 781 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
15007 :
15008 : /* Look up the target column */
15009 781 : heapTup = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
15010 781 : if (!HeapTupleIsValid(heapTup)) /* shouldn't happen */
15011 0 : ereport(ERROR,
15012 : (errcode(ERRCODE_UNDEFINED_COLUMN),
15013 : errmsg("column \"%s\" of relation \"%s\" does not exist",
15014 : colName, RelationGetRelationName(rel))));
15015 781 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
15016 781 : attnum = attTup->attnum;
15017 781 : attOldTup = TupleDescAttr(tab->oldDesc, attnum - 1);
15018 :
15019 : /* Check for multiple ALTER TYPE on same column --- can't cope */
15020 781 : if (attTup->atttypid != attOldTup->atttypid ||
15021 781 : attTup->atttypmod != attOldTup->atttypmod)
15022 0 : ereport(ERROR,
15023 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15024 : errmsg("cannot alter type of column \"%s\" twice",
15025 : colName)));
15026 :
15027 : /* Look up the target type (should not fail, since prep found it) */
15028 781 : typeTuple = typenameType(NULL, typeName, &targettypmod);
15029 781 : tform = (Form_pg_type) GETSTRUCT(typeTuple);
15030 781 : targettype = tform->oid;
15031 : /* And the collation */
15032 781 : targetcollid = GetColumnDefCollation(NULL, def, targettype);
15033 :
15034 : /*
15035 : * If there is a default expression for the column, get it and ensure we
15036 : * can coerce it to the new datatype. (We must do this before changing
15037 : * the column type, because build_column_default itself will try to
15038 : * coerce, and will not issue the error message we want if it fails.)
15039 : *
15040 : * We remove any implicit coercion steps at the top level of the old
15041 : * default expression; this has been agreed to satisfy the principle of
15042 : * least surprise. (The conversion to the new column type should act like
15043 : * it started from what the user sees as the stored expression, and the
15044 : * implicit coercions aren't going to be shown.)
15045 : */
15046 781 : if (attTup->atthasdef)
15047 : {
15048 60 : defaultexpr = build_column_default(rel, attnum);
15049 : Assert(defaultexpr);
15050 60 : defaultexpr = strip_implicit_coercions(defaultexpr);
15051 60 : defaultexpr = coerce_to_target_type(NULL, /* no UNKNOWN params */
15052 : defaultexpr, exprType(defaultexpr),
15053 : targettype, targettypmod,
15054 : COERCION_ASSIGNMENT,
15055 : COERCE_IMPLICIT_CAST,
15056 : -1);
15057 60 : if (defaultexpr == NULL)
15058 : {
15059 4 : if (attTup->attgenerated)
15060 0 : ereport(ERROR,
15061 : (errcode(ERRCODE_DATATYPE_MISMATCH),
15062 : errmsg("generation expression for column \"%s\" cannot be cast automatically to type %s",
15063 : colName, format_type_be(targettype))));
15064 : else
15065 4 : ereport(ERROR,
15066 : (errcode(ERRCODE_DATATYPE_MISMATCH),
15067 : errmsg("default for column \"%s\" cannot be cast automatically to type %s",
15068 : colName, format_type_be(targettype))));
15069 : }
15070 : }
15071 : else
15072 721 : defaultexpr = NULL;
15073 :
15074 : /*
15075 : * Find everything that depends on the column (constraints, indexes, etc),
15076 : * and record enough information to let us recreate the objects.
15077 : *
15078 : * The actual recreation does not happen here, but only after we have
15079 : * performed all the individual ALTER TYPE operations. We have to save
15080 : * the info before executing ALTER TYPE, though, else the deparser will
15081 : * get confused.
15082 : */
15083 777 : RememberAllDependentForRebuilding(tab, AT_AlterColumnType, rel, attnum, colName);
15084 :
15085 : /*
15086 : * Now scan for dependencies of this column on other things. The only
15087 : * things we should find are the dependency on the column datatype and
15088 : * possibly a collation dependency. Those can be removed.
15089 : */
15090 753 : depRel = table_open(DependRelationId, RowExclusiveLock);
15091 :
15092 753 : ScanKeyInit(&key[0],
15093 : Anum_pg_depend_classid,
15094 : BTEqualStrategyNumber, F_OIDEQ,
15095 : ObjectIdGetDatum(RelationRelationId));
15096 753 : ScanKeyInit(&key[1],
15097 : Anum_pg_depend_objid,
15098 : BTEqualStrategyNumber, F_OIDEQ,
15099 : ObjectIdGetDatum(RelationGetRelid(rel)));
15100 753 : ScanKeyInit(&key[2],
15101 : Anum_pg_depend_objsubid,
15102 : BTEqualStrategyNumber, F_INT4EQ,
15103 : Int32GetDatum((int32) attnum));
15104 :
15105 753 : scan = systable_beginscan(depRel, DependDependerIndexId, true,
15106 : NULL, 3, key);
15107 :
15108 755 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15109 : {
15110 2 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15111 : ObjectAddress foundObject;
15112 :
15113 2 : foundObject.classId = foundDep->refclassid;
15114 2 : foundObject.objectId = foundDep->refobjid;
15115 2 : foundObject.objectSubId = foundDep->refobjsubid;
15116 :
15117 2 : if (foundDep->deptype != DEPENDENCY_NORMAL)
15118 0 : elog(ERROR, "found unexpected dependency type '%c'",
15119 : foundDep->deptype);
15120 2 : if (!(foundDep->refclassid == TypeRelationId &&
15121 2 : foundDep->refobjid == attTup->atttypid) &&
15122 0 : !(foundDep->refclassid == CollationRelationId &&
15123 0 : foundDep->refobjid == attTup->attcollation))
15124 0 : elog(ERROR, "found unexpected dependency for column: %s",
15125 : getObjectDescription(&foundObject, false));
15126 :
15127 2 : CatalogTupleDelete(depRel, &depTup->t_self);
15128 : }
15129 :
15130 753 : systable_endscan(scan);
15131 :
15132 753 : table_close(depRel, RowExclusiveLock);
15133 :
15134 : /*
15135 : * Here we go --- change the recorded column type and collation. (Note
15136 : * heapTup is a copy of the syscache entry, so okay to scribble on.) First
15137 : * fix up the missing value if any.
15138 : */
15139 753 : if (attTup->atthasmissing)
15140 : {
15141 : Datum missingval;
15142 : bool missingNull;
15143 :
15144 : /* if rewrite is true the missing value should already be cleared */
15145 : Assert(tab->rewrite == 0);
15146 :
15147 : /* Get the missing value datum */
15148 4 : missingval = heap_getattr(heapTup,
15149 : Anum_pg_attribute_attmissingval,
15150 : attrelation->rd_att,
15151 : &missingNull);
15152 :
15153 : /* if it's a null array there is nothing to do */
15154 :
15155 4 : if (!missingNull)
15156 : {
15157 : /*
15158 : * Get the datum out of the array and repack it in a new array
15159 : * built with the new type data. We assume that since the table
15160 : * doesn't need rewriting, the actual Datum doesn't need to be
15161 : * changed, only the array metadata.
15162 : */
15163 :
15164 4 : int one = 1;
15165 : bool isNull;
15166 4 : Datum valuesAtt[Natts_pg_attribute] = {0};
15167 4 : bool nullsAtt[Natts_pg_attribute] = {0};
15168 4 : bool replacesAtt[Natts_pg_attribute] = {0};
15169 : HeapTuple newTup;
15170 :
15171 8 : missingval = array_get_element(missingval,
15172 : 1,
15173 : &one,
15174 : 0,
15175 4 : attTup->attlen,
15176 4 : attTup->attbyval,
15177 4 : attTup->attalign,
15178 : &isNull);
15179 4 : missingval = PointerGetDatum(construct_array(&missingval,
15180 : 1,
15181 : targettype,
15182 4 : tform->typlen,
15183 4 : tform->typbyval,
15184 4 : tform->typalign));
15185 :
15186 4 : valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
15187 4 : replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;
15188 4 : nullsAtt[Anum_pg_attribute_attmissingval - 1] = false;
15189 :
15190 4 : newTup = heap_modify_tuple(heapTup, RelationGetDescr(attrelation),
15191 : valuesAtt, nullsAtt, replacesAtt);
15192 4 : heap_freetuple(heapTup);
15193 4 : heapTup = newTup;
15194 4 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
15195 : }
15196 : }
15197 :
15198 753 : attTup->atttypid = targettype;
15199 753 : attTup->atttypmod = targettypmod;
15200 753 : attTup->attcollation = targetcollid;
15201 753 : if (list_length(typeName->arrayBounds) > PG_INT16_MAX)
15202 0 : ereport(ERROR,
15203 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
15204 : errmsg("too many array dimensions"));
15205 753 : attTup->attndims = list_length(typeName->arrayBounds);
15206 753 : attTup->attlen = tform->typlen;
15207 753 : attTup->attbyval = tform->typbyval;
15208 753 : attTup->attalign = tform->typalign;
15209 753 : attTup->attstorage = tform->typstorage;
15210 753 : attTup->attcompression = InvalidCompressionMethod;
15211 :
15212 753 : ReleaseSysCache(typeTuple);
15213 :
15214 753 : CatalogTupleUpdate(attrelation, &heapTup->t_self, heapTup);
15215 :
15216 753 : table_close(attrelation, RowExclusiveLock);
15217 :
15218 : /* Install dependencies on new datatype and collation */
15219 753 : add_column_datatype_dependency(RelationGetRelid(rel), attnum, targettype);
15220 753 : add_column_collation_dependency(RelationGetRelid(rel), attnum, targetcollid);
15221 :
15222 : /*
15223 : * Drop any pg_statistic entry for the column, since it's now wrong type
15224 : */
15225 753 : RemoveStatistics(RelationGetRelid(rel), attnum);
15226 :
15227 753 : InvokeObjectPostAlterHook(RelationRelationId,
15228 : RelationGetRelid(rel), attnum);
15229 :
15230 : /*
15231 : * Update the default, if present, by brute force --- remove and re-add
15232 : * the default. Probably unsafe to take shortcuts, since the new version
15233 : * may well have additional dependencies. (It's okay to do this now,
15234 : * rather than after other ALTER TYPE commands, since the default won't
15235 : * depend on other column types.)
15236 : */
15237 753 : if (defaultexpr)
15238 : {
15239 : /*
15240 : * If it's a GENERATED default, drop its dependency records, in
15241 : * particular its INTERNAL dependency on the column, which would
15242 : * otherwise cause dependency.c to refuse to perform the deletion.
15243 : */
15244 56 : if (attTup->attgenerated)
15245 : {
15246 24 : Oid attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
15247 :
15248 24 : if (!OidIsValid(attrdefoid))
15249 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
15250 : RelationGetRelid(rel), attnum);
15251 24 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
15252 : }
15253 :
15254 : /*
15255 : * Make updates-so-far visible, particularly the new pg_attribute row
15256 : * which will be updated again.
15257 : */
15258 56 : CommandCounterIncrement();
15259 :
15260 : /*
15261 : * We use RESTRICT here for safety, but at present we do not expect
15262 : * anything to depend on the default.
15263 : */
15264 56 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true,
15265 : true);
15266 :
15267 56 : (void) StoreAttrDefault(rel, attnum, defaultexpr, true);
15268 : }
15269 :
15270 753 : ObjectAddressSubSet(address, RelationRelationId,
15271 : RelationGetRelid(rel), attnum);
15272 :
15273 : /* Cleanup */
15274 753 : heap_freetuple(heapTup);
15275 :
15276 753 : return address;
15277 : }
15278 :
15279 : /*
15280 : * Subroutine for ATExecAlterColumnType and ATExecSetExpression: Find everything
15281 : * that depends on the column (constraints, indexes, etc), and record enough
15282 : * information to let us recreate the objects.
15283 : */
15284 : static void
15285 918 : RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
15286 : Relation rel, AttrNumber attnum, const char *colName)
15287 : {
15288 : Relation depRel;
15289 : ScanKeyData key[3];
15290 : SysScanDesc scan;
15291 : HeapTuple depTup;
15292 :
15293 : Assert(subtype == AT_AlterColumnType || subtype == AT_SetExpression);
15294 :
15295 918 : depRel = table_open(DependRelationId, RowExclusiveLock);
15296 :
15297 918 : ScanKeyInit(&key[0],
15298 : Anum_pg_depend_refclassid,
15299 : BTEqualStrategyNumber, F_OIDEQ,
15300 : ObjectIdGetDatum(RelationRelationId));
15301 918 : ScanKeyInit(&key[1],
15302 : Anum_pg_depend_refobjid,
15303 : BTEqualStrategyNumber, F_OIDEQ,
15304 : ObjectIdGetDatum(RelationGetRelid(rel)));
15305 918 : ScanKeyInit(&key[2],
15306 : Anum_pg_depend_refobjsubid,
15307 : BTEqualStrategyNumber, F_INT4EQ,
15308 : Int32GetDatum((int32) attnum));
15309 :
15310 918 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
15311 : NULL, 3, key);
15312 :
15313 1861 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15314 : {
15315 967 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15316 : ObjectAddress foundObject;
15317 :
15318 967 : foundObject.classId = foundDep->classid;
15319 967 : foundObject.objectId = foundDep->objid;
15320 967 : foundObject.objectSubId = foundDep->objsubid;
15321 :
15322 967 : switch (foundObject.classId)
15323 : {
15324 193 : case RelationRelationId:
15325 : {
15326 193 : char relKind = get_rel_relkind(foundObject.objectId);
15327 :
15328 193 : if (relKind == RELKIND_INDEX ||
15329 : relKind == RELKIND_PARTITIONED_INDEX)
15330 : {
15331 : Assert(foundObject.objectSubId == 0);
15332 168 : RememberIndexForRebuilding(foundObject.objectId, tab);
15333 : }
15334 25 : else if (relKind == RELKIND_SEQUENCE)
15335 : {
15336 : /*
15337 : * This must be a SERIAL column's sequence. We need
15338 : * not do anything to it.
15339 : */
15340 : Assert(foundObject.objectSubId == 0);
15341 : }
15342 : else
15343 : {
15344 : /* Not expecting any other direct dependencies... */
15345 0 : elog(ERROR, "unexpected object depending on column: %s",
15346 : getObjectDescription(&foundObject, false));
15347 : }
15348 193 : break;
15349 : }
15350 :
15351 500 : case ConstraintRelationId:
15352 : Assert(foundObject.objectSubId == 0);
15353 500 : RememberConstraintForRebuilding(foundObject.objectId, tab);
15354 500 : break;
15355 :
15356 0 : case ProcedureRelationId:
15357 :
15358 : /*
15359 : * A new-style SQL function can depend on a column, if that
15360 : * column is referenced in the parsed function body. Ideally
15361 : * we'd automatically update the function by deparsing and
15362 : * reparsing it, but that's risky and might well fail anyhow.
15363 : * FIXME someday.
15364 : *
15365 : * This is only a problem for AT_AlterColumnType, not
15366 : * AT_SetExpression.
15367 : */
15368 0 : if (subtype == AT_AlterColumnType)
15369 0 : ereport(ERROR,
15370 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15371 : errmsg("cannot alter type of a column used by a function or procedure"),
15372 : errdetail("%s depends on column \"%s\"",
15373 : getObjectDescription(&foundObject, false),
15374 : colName)));
15375 0 : break;
15376 :
15377 8 : case RewriteRelationId:
15378 :
15379 : /*
15380 : * View/rule bodies have pretty much the same issues as
15381 : * function bodies. FIXME someday.
15382 : */
15383 8 : if (subtype == AT_AlterColumnType)
15384 8 : ereport(ERROR,
15385 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15386 : errmsg("cannot alter type of a column used by a view or rule"),
15387 : errdetail("%s depends on column \"%s\"",
15388 : getObjectDescription(&foundObject, false),
15389 : colName)));
15390 0 : break;
15391 :
15392 0 : case TriggerRelationId:
15393 :
15394 : /*
15395 : * A trigger can depend on a column because the column is
15396 : * specified as an update target, or because the column is
15397 : * used in the trigger's WHEN condition. The first case would
15398 : * not require any extra work, but the second case would
15399 : * require updating the WHEN expression, which has the same
15400 : * issues as above. Since we can't easily tell which case
15401 : * applies, we punt for both. FIXME someday.
15402 : */
15403 0 : if (subtype == AT_AlterColumnType)
15404 0 : ereport(ERROR,
15405 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15406 : errmsg("cannot alter type of a column used in a trigger definition"),
15407 : errdetail("%s depends on column \"%s\"",
15408 : getObjectDescription(&foundObject, false),
15409 : colName)));
15410 0 : break;
15411 :
15412 0 : case PolicyRelationId:
15413 :
15414 : /*
15415 : * A policy can depend on a column because the column is
15416 : * specified in the policy's USING or WITH CHECK qual
15417 : * expressions. It might be possible to rewrite and recheck
15418 : * the policy expression, but punt for now. It's certainly
15419 : * easy enough to remove and recreate the policy; still, FIXME
15420 : * someday.
15421 : */
15422 0 : if (subtype == AT_AlterColumnType)
15423 0 : ereport(ERROR,
15424 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15425 : errmsg("cannot alter type of a column used in a policy definition"),
15426 : errdetail("%s depends on column \"%s\"",
15427 : getObjectDescription(&foundObject, false),
15428 : colName)));
15429 0 : break;
15430 :
15431 213 : case AttrDefaultRelationId:
15432 : {
15433 213 : ObjectAddress col = GetAttrDefaultColumnAddress(foundObject.objectId);
15434 :
15435 410 : if (col.objectId == RelationGetRelid(rel) &&
15436 213 : col.objectSubId == attnum)
15437 : {
15438 : /*
15439 : * Ignore the column's own default expression. The
15440 : * caller deals with it.
15441 : */
15442 : }
15443 : else
15444 : {
15445 : /*
15446 : * This must be a reference from the expression of a
15447 : * generated column elsewhere in the same table.
15448 : * Changing the type/generated expression of a column
15449 : * that is used by a generated column is not allowed
15450 : * by SQL standard, so just punt for now. It might be
15451 : * doable with some thinking and effort.
15452 : */
15453 16 : if (subtype == AT_AlterColumnType)
15454 16 : ereport(ERROR,
15455 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15456 : errmsg("cannot alter type of a column used by a generated column"),
15457 : errdetail("Column \"%s\" is used by generated column \"%s\".",
15458 : colName,
15459 : get_attname(col.objectId,
15460 : col.objectSubId,
15461 : false))));
15462 : }
15463 197 : break;
15464 : }
15465 :
15466 53 : case StatisticExtRelationId:
15467 :
15468 : /*
15469 : * Give the extended-stats machinery a chance to fix anything
15470 : * that this column type change would break.
15471 : */
15472 53 : RememberStatisticsForRebuilding(foundObject.objectId, tab);
15473 53 : break;
15474 :
15475 0 : case PublicationRelRelationId:
15476 :
15477 : /*
15478 : * Column reference in a PUBLICATION ... FOR TABLE ... WHERE
15479 : * clause. Same issues as above. FIXME someday.
15480 : */
15481 0 : if (subtype == AT_AlterColumnType)
15482 0 : ereport(ERROR,
15483 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15484 : errmsg("cannot alter type of a column used by a publication WHERE clause"),
15485 : errdetail("%s depends on column \"%s\"",
15486 : getObjectDescription(&foundObject, false),
15487 : colName)));
15488 0 : break;
15489 :
15490 0 : default:
15491 :
15492 : /*
15493 : * We don't expect any other sorts of objects to depend on a
15494 : * column.
15495 : */
15496 0 : elog(ERROR, "unexpected object depending on column: %s",
15497 : getObjectDescription(&foundObject, false));
15498 : break;
15499 : }
15500 : }
15501 :
15502 894 : systable_endscan(scan);
15503 894 : table_close(depRel, NoLock);
15504 894 : }
15505 :
15506 : /*
15507 : * Subroutine for ATExecAlterColumnType: remember that a replica identity
15508 : * needs to be reset.
15509 : */
15510 : static void
15511 307 : RememberReplicaIdentityForRebuilding(Oid indoid, AlteredTableInfo *tab)
15512 : {
15513 307 : if (!get_index_isreplident(indoid))
15514 295 : return;
15515 :
15516 12 : if (tab->replicaIdentityIndex)
15517 0 : elog(ERROR, "relation %u has multiple indexes marked as replica identity", tab->relid);
15518 :
15519 12 : tab->replicaIdentityIndex = get_rel_name(indoid);
15520 : }
15521 :
15522 : /*
15523 : * Subroutine for ATExecAlterColumnType: remember any clustered index.
15524 : */
15525 : static void
15526 307 : RememberClusterOnForRebuilding(Oid indoid, AlteredTableInfo *tab)
15527 : {
15528 307 : if (!get_index_isclustered(indoid))
15529 295 : return;
15530 :
15531 12 : if (tab->clusterOnIndex)
15532 0 : elog(ERROR, "relation %u has multiple clustered indexes", tab->relid);
15533 :
15534 12 : tab->clusterOnIndex = get_rel_name(indoid);
15535 : }
15536 :
15537 : /*
15538 : * Subroutine for ATExecAlterColumnType: remember that a constraint needs
15539 : * to be rebuilt (which we might already know).
15540 : */
15541 : static void
15542 508 : RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab)
15543 : {
15544 : /*
15545 : * This de-duplication check is critical for two independent reasons: we
15546 : * mustn't try to recreate the same constraint twice, and if a constraint
15547 : * depends on more than one column whose type is to be altered, we must
15548 : * capture its definition string before applying any of the column type
15549 : * changes. ruleutils.c will get confused if we ask again later.
15550 : */
15551 508 : if (!list_member_oid(tab->changedConstraintOids, conoid))
15552 : {
15553 : /* OK, capture the constraint's existing definition string */
15554 436 : char *defstring = pg_get_constraintdef_command(conoid);
15555 : Oid indoid;
15556 :
15557 : /*
15558 : * It is critical to create not-null constraints ahead of primary key
15559 : * indexes; otherwise, the not-null constraint would be created by the
15560 : * primary key, and the constraint name would be wrong.
15561 : */
15562 436 : if (get_constraint_type(conoid) == CONSTRAINT_NOTNULL)
15563 : {
15564 147 : tab->changedConstraintOids = lcons_oid(conoid,
15565 : tab->changedConstraintOids);
15566 147 : tab->changedConstraintDefs = lcons(defstring,
15567 : tab->changedConstraintDefs);
15568 : }
15569 : else
15570 : {
15571 :
15572 289 : tab->changedConstraintOids = lappend_oid(tab->changedConstraintOids,
15573 : conoid);
15574 289 : tab->changedConstraintDefs = lappend(tab->changedConstraintDefs,
15575 : defstring);
15576 : }
15577 :
15578 : /*
15579 : * For the index of a constraint, if any, remember if it is used for
15580 : * the table's replica identity or if it is a clustered index, so that
15581 : * ATPostAlterTypeCleanup() can queue up commands necessary to restore
15582 : * those properties.
15583 : */
15584 436 : indoid = get_constraint_index(conoid);
15585 436 : if (OidIsValid(indoid))
15586 : {
15587 152 : RememberReplicaIdentityForRebuilding(indoid, tab);
15588 152 : RememberClusterOnForRebuilding(indoid, tab);
15589 : }
15590 : }
15591 508 : }
15592 :
15593 : /*
15594 : * Subroutine for ATExecAlterColumnType: remember that an index needs
15595 : * to be rebuilt (which we might already know).
15596 : */
15597 : static void
15598 168 : RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab)
15599 : {
15600 : /*
15601 : * This de-duplication check is critical for two independent reasons: we
15602 : * mustn't try to recreate the same index twice, and if an index depends
15603 : * on more than one column whose type is to be altered, we must capture
15604 : * its definition string before applying any of the column type changes.
15605 : * ruleutils.c will get confused if we ask again later.
15606 : */
15607 168 : if (!list_member_oid(tab->changedIndexOids, indoid))
15608 : {
15609 : /*
15610 : * Before adding it as an index-to-rebuild, we'd better see if it
15611 : * belongs to a constraint, and if so rebuild the constraint instead.
15612 : * Typically this check fails, because constraint indexes normally
15613 : * have only dependencies on their constraint. But it's possible for
15614 : * such an index to also have direct dependencies on table columns,
15615 : * for example with a partial exclusion constraint.
15616 : */
15617 163 : Oid conoid = get_index_constraint(indoid);
15618 :
15619 163 : if (OidIsValid(conoid))
15620 : {
15621 8 : RememberConstraintForRebuilding(conoid, tab);
15622 : }
15623 : else
15624 : {
15625 : /* OK, capture the index's existing definition string */
15626 155 : char *defstring = pg_get_indexdef_string(indoid);
15627 :
15628 155 : tab->changedIndexOids = lappend_oid(tab->changedIndexOids,
15629 : indoid);
15630 155 : tab->changedIndexDefs = lappend(tab->changedIndexDefs,
15631 : defstring);
15632 :
15633 : /*
15634 : * Remember if this index is used for the table's replica identity
15635 : * or if it is a clustered index, so that ATPostAlterTypeCleanup()
15636 : * can queue up commands necessary to restore those properties.
15637 : */
15638 155 : RememberReplicaIdentityForRebuilding(indoid, tab);
15639 155 : RememberClusterOnForRebuilding(indoid, tab);
15640 : }
15641 : }
15642 168 : }
15643 :
15644 : /*
15645 : * Subroutine for ATExecAlterColumnType: remember that a statistics object
15646 : * needs to be rebuilt (which we might already know).
15647 : */
15648 : static void
15649 53 : RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab)
15650 : {
15651 : /*
15652 : * This de-duplication check is critical for two independent reasons: we
15653 : * mustn't try to recreate the same statistics object twice, and if the
15654 : * statistics object depends on more than one column whose type is to be
15655 : * altered, we must capture its definition string before applying any of
15656 : * the type changes. ruleutils.c will get confused if we ask again later.
15657 : */
15658 53 : if (!list_member_oid(tab->changedStatisticsOids, stxoid))
15659 : {
15660 : /* OK, capture the statistics object's existing definition string */
15661 53 : char *defstring = pg_get_statisticsobjdef_string(stxoid);
15662 :
15663 53 : tab->changedStatisticsOids = lappend_oid(tab->changedStatisticsOids,
15664 : stxoid);
15665 53 : tab->changedStatisticsDefs = lappend(tab->changedStatisticsDefs,
15666 : defstring);
15667 : }
15668 53 : }
15669 :
15670 : /*
15671 : * Cleanup after we've finished all the ALTER TYPE or SET EXPRESSION
15672 : * operations for a particular relation. We have to drop and recreate all the
15673 : * indexes and constraints that depend on the altered columns. We do the
15674 : * actual dropping here, but re-creation is managed by adding work queue
15675 : * entries to do those steps later.
15676 : */
15677 : static void
15678 866 : ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode)
15679 : {
15680 : ObjectAddress obj;
15681 : ObjectAddresses *objects;
15682 : ListCell *def_item;
15683 : ListCell *oid_item;
15684 :
15685 : /*
15686 : * Collect all the constraints and indexes to drop so we can process them
15687 : * in a single call. That way we don't have to worry about dependencies
15688 : * among them.
15689 : */
15690 866 : objects = new_object_addresses();
15691 :
15692 : /*
15693 : * Re-parse the index and constraint definitions, and attach them to the
15694 : * appropriate work queue entries. We do this before dropping because in
15695 : * the case of a constraint on another table, we might not yet have
15696 : * exclusive lock on the table the constraint is attached to, and we need
15697 : * to get that before reparsing/dropping. (That's possible at least for
15698 : * FOREIGN KEY, CHECK, and EXCLUSION constraints; in non-FK cases it
15699 : * requires a dependency on the target table's composite type in the other
15700 : * table's constraint expressions.)
15701 : *
15702 : * We can't rely on the output of deparsing to tell us which relation to
15703 : * operate on, because concurrent activity might have made the name
15704 : * resolve differently. Instead, we've got to use the OID of the
15705 : * constraint or index we're processing to figure out which relation to
15706 : * operate on.
15707 : */
15708 1302 : forboth(oid_item, tab->changedConstraintOids,
15709 : def_item, tab->changedConstraintDefs)
15710 : {
15711 436 : Oid oldId = lfirst_oid(oid_item);
15712 : HeapTuple tup;
15713 : Form_pg_constraint con;
15714 : Oid relid;
15715 : Oid confrelid;
15716 : bool conislocal;
15717 :
15718 436 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15719 436 : if (!HeapTupleIsValid(tup)) /* should not happen */
15720 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15721 436 : con = (Form_pg_constraint) GETSTRUCT(tup);
15722 436 : if (OidIsValid(con->conrelid))
15723 427 : relid = con->conrelid;
15724 : else
15725 : {
15726 : /* must be a domain constraint */
15727 9 : relid = get_typ_typrelid(getBaseType(con->contypid));
15728 9 : if (!OidIsValid(relid))
15729 0 : elog(ERROR, "could not identify relation associated with constraint %u", oldId);
15730 : }
15731 436 : confrelid = con->confrelid;
15732 436 : conislocal = con->conislocal;
15733 436 : ReleaseSysCache(tup);
15734 :
15735 436 : ObjectAddressSet(obj, ConstraintRelationId, oldId);
15736 436 : add_exact_object_address(&obj, objects);
15737 :
15738 : /*
15739 : * If the constraint is inherited (only), we don't want to inject a
15740 : * new definition here; it'll get recreated when
15741 : * ATAddCheckNNConstraint recurses from adding the parent table's
15742 : * constraint. But we had to carry the info this far so that we can
15743 : * drop the constraint below.
15744 : */
15745 436 : if (!conislocal)
15746 26 : continue;
15747 :
15748 : /*
15749 : * When rebuilding another table's constraint that references the
15750 : * table we're modifying, we might not yet have any lock on the other
15751 : * table, so get one now. We'll need AccessExclusiveLock for the DROP
15752 : * CONSTRAINT step, so there's no value in asking for anything weaker.
15753 : */
15754 410 : if (relid != tab->relid)
15755 36 : LockRelationOid(relid, AccessExclusiveLock);
15756 :
15757 410 : ATPostAlterTypeParse(oldId, relid, confrelid,
15758 410 : (char *) lfirst(def_item),
15759 410 : wqueue, lockmode, tab->rewrite);
15760 : }
15761 1021 : forboth(oid_item, tab->changedIndexOids,
15762 : def_item, tab->changedIndexDefs)
15763 : {
15764 155 : Oid oldId = lfirst_oid(oid_item);
15765 : Oid relid;
15766 :
15767 155 : relid = IndexGetRelation(oldId, false);
15768 :
15769 : /*
15770 : * As above, make sure we have lock on the index's table if it's not
15771 : * the same table.
15772 : */
15773 155 : if (relid != tab->relid)
15774 12 : LockRelationOid(relid, AccessExclusiveLock);
15775 :
15776 155 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15777 155 : (char *) lfirst(def_item),
15778 155 : wqueue, lockmode, tab->rewrite);
15779 :
15780 155 : ObjectAddressSet(obj, RelationRelationId, oldId);
15781 155 : add_exact_object_address(&obj, objects);
15782 : }
15783 :
15784 : /* add dependencies for new statistics */
15785 919 : forboth(oid_item, tab->changedStatisticsOids,
15786 : def_item, tab->changedStatisticsDefs)
15787 : {
15788 53 : Oid oldId = lfirst_oid(oid_item);
15789 : Oid relid;
15790 :
15791 53 : relid = StatisticsGetRelation(oldId, false);
15792 :
15793 : /*
15794 : * As above, make sure we have lock on the statistics object's table
15795 : * if it's not the same table. However, we take
15796 : * ShareUpdateExclusiveLock here, aligning with the lock level used in
15797 : * CreateStatistics and RemoveStatisticsById.
15798 : *
15799 : * CAUTION: this should be done after all cases that grab
15800 : * AccessExclusiveLock, else we risk causing deadlock due to needing
15801 : * to promote our table lock.
15802 : */
15803 53 : if (relid != tab->relid)
15804 12 : LockRelationOid(relid, ShareUpdateExclusiveLock);
15805 :
15806 53 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15807 53 : (char *) lfirst(def_item),
15808 53 : wqueue, lockmode, tab->rewrite);
15809 :
15810 53 : ObjectAddressSet(obj, StatisticExtRelationId, oldId);
15811 53 : add_exact_object_address(&obj, objects);
15812 : }
15813 :
15814 : /*
15815 : * Queue up command to restore replica identity index marking
15816 : */
15817 866 : if (tab->replicaIdentityIndex)
15818 : {
15819 12 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15820 12 : ReplicaIdentityStmt *subcmd = makeNode(ReplicaIdentityStmt);
15821 :
15822 12 : subcmd->identity_type = REPLICA_IDENTITY_INDEX;
15823 12 : subcmd->name = tab->replicaIdentityIndex;
15824 12 : cmd->subtype = AT_ReplicaIdentity;
15825 12 : cmd->def = (Node *) subcmd;
15826 :
15827 : /* do it after indexes and constraints */
15828 12 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15829 12 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15830 : }
15831 :
15832 : /*
15833 : * Queue up command to restore marking of index used for cluster.
15834 : */
15835 866 : if (tab->clusterOnIndex)
15836 : {
15837 12 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15838 :
15839 12 : cmd->subtype = AT_ClusterOn;
15840 12 : cmd->name = tab->clusterOnIndex;
15841 :
15842 : /* do it after indexes and constraints */
15843 12 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15844 12 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15845 : }
15846 :
15847 : /*
15848 : * It should be okay to use DROP_RESTRICT here, since nothing else should
15849 : * be depending on these objects.
15850 : */
15851 866 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
15852 :
15853 866 : free_object_addresses(objects);
15854 :
15855 : /*
15856 : * The objects will get recreated during subsequent passes over the work
15857 : * queue.
15858 : */
15859 866 : }
15860 :
15861 : /*
15862 : * Parse the previously-saved definition string for a constraint, index or
15863 : * statistics object against the newly-established column data type(s), and
15864 : * queue up the resulting command parsetrees for execution.
15865 : *
15866 : * This might fail if, for example, you have a WHERE clause that uses an
15867 : * operator that's not available for the new column type.
15868 : */
15869 : static void
15870 618 : ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
15871 : List **wqueue, LOCKMODE lockmode, bool rewrite)
15872 : {
15873 : List *raw_parsetree_list;
15874 : List *querytree_list;
15875 : ListCell *list_item;
15876 : Relation rel;
15877 :
15878 : /*
15879 : * We expect that we will get only ALTER TABLE and CREATE INDEX
15880 : * statements. Hence, there is no need to pass them through
15881 : * parse_analyze_*() or the rewriter, but instead we need to pass them
15882 : * through parse_utilcmd.c to make them ready for execution.
15883 : */
15884 618 : raw_parsetree_list = raw_parser(cmd, RAW_PARSE_DEFAULT);
15885 618 : querytree_list = NIL;
15886 1236 : foreach(list_item, raw_parsetree_list)
15887 : {
15888 618 : RawStmt *rs = lfirst_node(RawStmt, list_item);
15889 618 : Node *stmt = rs->stmt;
15890 :
15891 618 : if (IsA(stmt, IndexStmt))
15892 155 : querytree_list = lappend(querytree_list,
15893 155 : transformIndexStmt(oldRelId,
15894 : (IndexStmt *) stmt,
15895 : cmd));
15896 463 : else if (IsA(stmt, AlterTableStmt))
15897 : {
15898 : List *beforeStmts;
15899 : List *afterStmts;
15900 :
15901 401 : stmt = (Node *) transformAlterTableStmt(oldRelId,
15902 : (AlterTableStmt *) stmt,
15903 : cmd,
15904 : &beforeStmts,
15905 : &afterStmts);
15906 401 : querytree_list = list_concat(querytree_list, beforeStmts);
15907 401 : querytree_list = lappend(querytree_list, stmt);
15908 401 : querytree_list = list_concat(querytree_list, afterStmts);
15909 : }
15910 62 : else if (IsA(stmt, CreateStatsStmt))
15911 53 : querytree_list = lappend(querytree_list,
15912 53 : transformStatsStmt(oldRelId,
15913 : (CreateStatsStmt *) stmt,
15914 : cmd));
15915 : else
15916 9 : querytree_list = lappend(querytree_list, stmt);
15917 : }
15918 :
15919 : /* Caller should already have acquired whatever lock we need. */
15920 618 : rel = relation_open(oldRelId, NoLock);
15921 :
15922 : /*
15923 : * Attach each generated command to the proper place in the work queue.
15924 : * Note this could result in creation of entirely new work-queue entries.
15925 : *
15926 : * Also note that we have to tweak the command subtypes, because it turns
15927 : * out that re-creation of indexes and constraints has to act a bit
15928 : * differently from initial creation.
15929 : */
15930 1236 : foreach(list_item, querytree_list)
15931 : {
15932 618 : Node *stm = (Node *) lfirst(list_item);
15933 : AlteredTableInfo *tab;
15934 :
15935 618 : tab = ATGetQueueEntry(wqueue, rel);
15936 :
15937 618 : if (IsA(stm, IndexStmt))
15938 : {
15939 155 : IndexStmt *stmt = (IndexStmt *) stm;
15940 : AlterTableCmd *newcmd;
15941 :
15942 155 : if (!rewrite)
15943 41 : TryReuseIndex(oldId, stmt);
15944 155 : stmt->reset_default_tblspc = true;
15945 : /* keep the index's comment */
15946 155 : stmt->idxcomment = GetComment(oldId, RelationRelationId, 0);
15947 :
15948 155 : newcmd = makeNode(AlterTableCmd);
15949 155 : newcmd->subtype = AT_ReAddIndex;
15950 155 : newcmd->def = (Node *) stmt;
15951 155 : tab->subcmds[AT_PASS_OLD_INDEX] =
15952 155 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], newcmd);
15953 : }
15954 463 : else if (IsA(stm, AlterTableStmt))
15955 : {
15956 401 : AlterTableStmt *stmt = (AlterTableStmt *) stm;
15957 : ListCell *lcmd;
15958 :
15959 802 : foreach(lcmd, stmt->cmds)
15960 : {
15961 401 : AlterTableCmd *cmd = lfirst_node(AlterTableCmd, lcmd);
15962 :
15963 401 : if (cmd->subtype == AT_AddIndex)
15964 : {
15965 : IndexStmt *indstmt;
15966 : Oid indoid;
15967 :
15968 152 : indstmt = castNode(IndexStmt, cmd->def);
15969 152 : indoid = get_constraint_index(oldId);
15970 :
15971 152 : if (!rewrite)
15972 32 : TryReuseIndex(indoid, indstmt);
15973 : /* keep any comment on the index */
15974 152 : indstmt->idxcomment = GetComment(indoid,
15975 : RelationRelationId, 0);
15976 152 : indstmt->reset_default_tblspc = true;
15977 :
15978 152 : cmd->subtype = AT_ReAddIndex;
15979 152 : tab->subcmds[AT_PASS_OLD_INDEX] =
15980 152 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], cmd);
15981 :
15982 : /* recreate any comment on the constraint */
15983 152 : RebuildConstraintComment(tab,
15984 : AT_PASS_OLD_INDEX,
15985 : oldId,
15986 : rel,
15987 : NIL,
15988 152 : indstmt->idxname);
15989 : }
15990 249 : else if (cmd->subtype == AT_AddConstraint)
15991 : {
15992 249 : Constraint *con = castNode(Constraint, cmd->def);
15993 :
15994 249 : con->old_pktable_oid = refRelId;
15995 : /* rewriting neither side of a FK */
15996 249 : if (con->contype == CONSTR_FOREIGN &&
15997 48 : !rewrite && tab->rewrite == 0)
15998 4 : TryReuseForeignKey(oldId, con);
15999 249 : con->reset_default_tblspc = true;
16000 249 : cmd->subtype = AT_ReAddConstraint;
16001 249 : tab->subcmds[AT_PASS_OLD_CONSTR] =
16002 249 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
16003 :
16004 : /*
16005 : * Recreate any comment on the constraint. If we have
16006 : * recreated a primary key, then transformTableConstraint
16007 : * has added an unnamed not-null constraint here; skip
16008 : * this in that case.
16009 : */
16010 249 : if (con->conname)
16011 249 : RebuildConstraintComment(tab,
16012 : AT_PASS_OLD_CONSTR,
16013 : oldId,
16014 : rel,
16015 : NIL,
16016 249 : con->conname);
16017 : else
16018 : Assert(con->contype == CONSTR_NOTNULL);
16019 : }
16020 : else
16021 0 : elog(ERROR, "unexpected statement subtype: %d",
16022 : (int) cmd->subtype);
16023 : }
16024 : }
16025 62 : else if (IsA(stm, AlterDomainStmt))
16026 : {
16027 9 : AlterDomainStmt *stmt = (AlterDomainStmt *) stm;
16028 :
16029 9 : if (stmt->subtype == AD_AddConstraint)
16030 : {
16031 9 : Constraint *con = castNode(Constraint, stmt->def);
16032 9 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
16033 :
16034 9 : cmd->subtype = AT_ReAddDomainConstraint;
16035 9 : cmd->def = (Node *) stmt;
16036 9 : tab->subcmds[AT_PASS_OLD_CONSTR] =
16037 9 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
16038 :
16039 : /* recreate any comment on the constraint */
16040 9 : RebuildConstraintComment(tab,
16041 : AT_PASS_OLD_CONSTR,
16042 : oldId,
16043 : NULL,
16044 : stmt->typeName,
16045 9 : con->conname);
16046 : }
16047 : else
16048 0 : elog(ERROR, "unexpected statement subtype: %d",
16049 : (int) stmt->subtype);
16050 : }
16051 53 : else if (IsA(stm, CreateStatsStmt))
16052 : {
16053 53 : CreateStatsStmt *stmt = (CreateStatsStmt *) stm;
16054 : AlterTableCmd *newcmd;
16055 :
16056 : /* keep the statistics object's comment */
16057 53 : stmt->stxcomment = GetComment(oldId, StatisticExtRelationId, 0);
16058 :
16059 53 : newcmd = makeNode(AlterTableCmd);
16060 53 : newcmd->subtype = AT_ReAddStatistics;
16061 53 : newcmd->def = (Node *) stmt;
16062 53 : tab->subcmds[AT_PASS_MISC] =
16063 53 : lappend(tab->subcmds[AT_PASS_MISC], newcmd);
16064 : }
16065 : else
16066 0 : elog(ERROR, "unexpected statement type: %d",
16067 : (int) nodeTag(stm));
16068 : }
16069 :
16070 618 : relation_close(rel, NoLock);
16071 618 : }
16072 :
16073 : /*
16074 : * Subroutine for ATPostAlterTypeParse() to recreate any existing comment
16075 : * for a table or domain constraint that is being rebuilt.
16076 : *
16077 : * objid is the OID of the constraint.
16078 : * Pass "rel" for a table constraint, or "domname" (domain's qualified name
16079 : * as a string list) for a domain constraint.
16080 : * (We could dig that info, as well as the conname, out of the pg_constraint
16081 : * entry; but callers already have them so might as well pass them.)
16082 : */
16083 : static void
16084 410 : RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass, Oid objid,
16085 : Relation rel, List *domname,
16086 : const char *conname)
16087 : {
16088 : CommentStmt *cmd;
16089 : char *comment_str;
16090 : AlterTableCmd *newcmd;
16091 :
16092 : /* Look for comment for object wanted, and leave if none */
16093 410 : comment_str = GetComment(objid, ConstraintRelationId, 0);
16094 410 : if (comment_str == NULL)
16095 350 : return;
16096 :
16097 : /* Build CommentStmt node, copying all input data for safety */
16098 60 : cmd = makeNode(CommentStmt);
16099 60 : if (rel)
16100 : {
16101 52 : cmd->objtype = OBJECT_TABCONSTRAINT;
16102 52 : cmd->object = (Node *)
16103 52 : list_make3(makeString(get_namespace_name(RelationGetNamespace(rel))),
16104 : makeString(pstrdup(RelationGetRelationName(rel))),
16105 : makeString(pstrdup(conname)));
16106 : }
16107 : else
16108 : {
16109 8 : cmd->objtype = OBJECT_DOMCONSTRAINT;
16110 8 : cmd->object = (Node *)
16111 8 : list_make2(makeTypeNameFromNameList(copyObject(domname)),
16112 : makeString(pstrdup(conname)));
16113 : }
16114 60 : cmd->comment = comment_str;
16115 :
16116 : /* Append it to list of commands */
16117 60 : newcmd = makeNode(AlterTableCmd);
16118 60 : newcmd->subtype = AT_ReAddComment;
16119 60 : newcmd->def = (Node *) cmd;
16120 60 : tab->subcmds[pass] = lappend(tab->subcmds[pass], newcmd);
16121 : }
16122 :
16123 : /*
16124 : * Subroutine for ATPostAlterTypeParse(). Calls out to CheckIndexCompatible()
16125 : * for the real analysis, then mutates the IndexStmt based on that verdict.
16126 : */
16127 : static void
16128 73 : TryReuseIndex(Oid oldId, IndexStmt *stmt)
16129 : {
16130 73 : if (CheckIndexCompatible(oldId,
16131 73 : stmt->accessMethod,
16132 73 : stmt->indexParams,
16133 73 : stmt->excludeOpNames,
16134 73 : stmt->iswithoutoverlaps))
16135 : {
16136 69 : Relation irel = index_open(oldId, NoLock);
16137 :
16138 : /* If it's a partitioned index, there is no storage to share. */
16139 69 : if (irel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
16140 : {
16141 49 : stmt->oldNumber = irel->rd_locator.relNumber;
16142 49 : stmt->oldCreateSubid = irel->rd_createSubid;
16143 49 : stmt->oldFirstRelfilelocatorSubid = irel->rd_firstRelfilelocatorSubid;
16144 : }
16145 69 : index_close(irel, NoLock);
16146 : }
16147 73 : }
16148 :
16149 : /*
16150 : * Subroutine for ATPostAlterTypeParse().
16151 : *
16152 : * Stash the old P-F equality operator into the Constraint node, for possible
16153 : * use by ATAddForeignKeyConstraint() in determining whether revalidation of
16154 : * this constraint can be skipped.
16155 : */
16156 : static void
16157 4 : TryReuseForeignKey(Oid oldId, Constraint *con)
16158 : {
16159 : HeapTuple tup;
16160 : Datum adatum;
16161 : ArrayType *arr;
16162 : Oid *rawarr;
16163 : int numkeys;
16164 : int i;
16165 :
16166 : Assert(con->contype == CONSTR_FOREIGN);
16167 : Assert(con->old_conpfeqop == NIL); /* already prepared this node */
16168 :
16169 4 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
16170 4 : if (!HeapTupleIsValid(tup)) /* should not happen */
16171 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
16172 :
16173 4 : adatum = SysCacheGetAttrNotNull(CONSTROID, tup,
16174 : Anum_pg_constraint_conpfeqop);
16175 4 : arr = DatumGetArrayTypeP(adatum); /* ensure not toasted */
16176 4 : numkeys = ARR_DIMS(arr)[0];
16177 : /* test follows the one in ri_FetchConstraintInfo() */
16178 4 : if (ARR_NDIM(arr) != 1 ||
16179 4 : ARR_HASNULL(arr) ||
16180 4 : ARR_ELEMTYPE(arr) != OIDOID)
16181 0 : elog(ERROR, "conpfeqop is not a 1-D Oid array");
16182 4 : rawarr = (Oid *) ARR_DATA_PTR(arr);
16183 :
16184 : /* stash a List of the operator Oids in our Constraint node */
16185 8 : for (i = 0; i < numkeys; i++)
16186 4 : con->old_conpfeqop = lappend_oid(con->old_conpfeqop, rawarr[i]);
16187 :
16188 4 : ReleaseSysCache(tup);
16189 4 : }
16190 :
16191 : /*
16192 : * ALTER COLUMN .. OPTIONS ( ... )
16193 : *
16194 : * Returns the address of the modified column
16195 : */
16196 : static ObjectAddress
16197 93 : ATExecAlterColumnGenericOptions(Relation rel,
16198 : const char *colName,
16199 : List *options,
16200 : LOCKMODE lockmode)
16201 : {
16202 : Relation ftrel;
16203 : Relation attrel;
16204 : ForeignServer *server;
16205 : ForeignDataWrapper *fdw;
16206 : HeapTuple tuple;
16207 : HeapTuple newtuple;
16208 : bool isnull;
16209 : Datum repl_val[Natts_pg_attribute];
16210 : bool repl_null[Natts_pg_attribute];
16211 : bool repl_repl[Natts_pg_attribute];
16212 : Datum datum;
16213 : Form_pg_foreign_table fttableform;
16214 : Form_pg_attribute atttableform;
16215 : AttrNumber attnum;
16216 : ObjectAddress address;
16217 :
16218 93 : if (options == NIL)
16219 0 : return InvalidObjectAddress;
16220 :
16221 : /* First, determine FDW validator associated to the foreign table. */
16222 93 : ftrel = table_open(ForeignTableRelationId, AccessShareLock);
16223 93 : tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(rel->rd_id));
16224 93 : if (!HeapTupleIsValid(tuple))
16225 0 : ereport(ERROR,
16226 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16227 : errmsg("foreign table \"%s\" does not exist",
16228 : RelationGetRelationName(rel))));
16229 93 : fttableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
16230 93 : server = GetForeignServer(fttableform->ftserver);
16231 93 : fdw = GetForeignDataWrapper(server->fdwid);
16232 :
16233 93 : table_close(ftrel, AccessShareLock);
16234 93 : ReleaseSysCache(tuple);
16235 :
16236 93 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
16237 93 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
16238 93 : if (!HeapTupleIsValid(tuple))
16239 0 : ereport(ERROR,
16240 : (errcode(ERRCODE_UNDEFINED_COLUMN),
16241 : errmsg("column \"%s\" of relation \"%s\" does not exist",
16242 : colName, RelationGetRelationName(rel))));
16243 :
16244 : /* Prevent them from altering a system attribute */
16245 93 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
16246 93 : attnum = atttableform->attnum;
16247 93 : if (attnum <= 0)
16248 4 : ereport(ERROR,
16249 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16250 : errmsg("cannot alter system column \"%s\"", colName)));
16251 :
16252 :
16253 : /* Initialize buffers for new tuple values */
16254 89 : memset(repl_val, 0, sizeof(repl_val));
16255 89 : memset(repl_null, false, sizeof(repl_null));
16256 89 : memset(repl_repl, false, sizeof(repl_repl));
16257 :
16258 : /* Extract the current options */
16259 89 : datum = SysCacheGetAttr(ATTNAME,
16260 : tuple,
16261 : Anum_pg_attribute_attfdwoptions,
16262 : &isnull);
16263 89 : if (isnull)
16264 83 : datum = PointerGetDatum(NULL);
16265 :
16266 : /* Transform the options */
16267 89 : datum = transformGenericOptions(AttributeRelationId,
16268 : datum,
16269 : options,
16270 : fdw->fdwvalidator);
16271 :
16272 89 : if (DatumGetPointer(datum) != NULL)
16273 89 : repl_val[Anum_pg_attribute_attfdwoptions - 1] = datum;
16274 : else
16275 0 : repl_null[Anum_pg_attribute_attfdwoptions - 1] = true;
16276 :
16277 89 : repl_repl[Anum_pg_attribute_attfdwoptions - 1] = true;
16278 :
16279 : /* Everything looks good - update the tuple */
16280 :
16281 89 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrel),
16282 : repl_val, repl_null, repl_repl);
16283 :
16284 89 : CatalogTupleUpdate(attrel, &newtuple->t_self, newtuple);
16285 :
16286 89 : InvokeObjectPostAlterHook(RelationRelationId,
16287 : RelationGetRelid(rel),
16288 : atttableform->attnum);
16289 89 : ObjectAddressSubSet(address, RelationRelationId,
16290 : RelationGetRelid(rel), attnum);
16291 :
16292 89 : ReleaseSysCache(tuple);
16293 :
16294 89 : table_close(attrel, RowExclusiveLock);
16295 :
16296 89 : heap_freetuple(newtuple);
16297 :
16298 89 : return address;
16299 : }
16300 :
16301 : /*
16302 : * ALTER TABLE OWNER
16303 : *
16304 : * recursing is true if we are recursing from a table to its indexes,
16305 : * sequences, or toast table. We don't allow the ownership of those things to
16306 : * be changed separately from the parent table. Also, we can skip permission
16307 : * checks (this is necessary not just an optimization, else we'd fail to
16308 : * handle toast tables properly).
16309 : *
16310 : * recursing is also true if ALTER TYPE OWNER is calling us to fix up a
16311 : * free-standing composite type.
16312 : */
16313 : void
16314 1312 : ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing, LOCKMODE lockmode)
16315 : {
16316 : Relation target_rel;
16317 : Relation class_rel;
16318 : HeapTuple tuple;
16319 : Form_pg_class tuple_class;
16320 :
16321 : /*
16322 : * Get exclusive lock till end of transaction on the target table. Use
16323 : * relation_open so that we can work on indexes and sequences.
16324 : */
16325 1312 : target_rel = relation_open(relationOid, lockmode);
16326 :
16327 : /* Get its pg_class tuple, too */
16328 1312 : class_rel = table_open(RelationRelationId, RowExclusiveLock);
16329 :
16330 1312 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relationOid));
16331 1312 : if (!HeapTupleIsValid(tuple))
16332 0 : elog(ERROR, "cache lookup failed for relation %u", relationOid);
16333 1312 : tuple_class = (Form_pg_class) GETSTRUCT(tuple);
16334 :
16335 : /* Can we change the ownership of this tuple? */
16336 1312 : switch (tuple_class->relkind)
16337 : {
16338 1121 : case RELKIND_RELATION:
16339 : case RELKIND_VIEW:
16340 : case RELKIND_MATVIEW:
16341 : case RELKIND_FOREIGN_TABLE:
16342 : case RELKIND_PARTITIONED_TABLE:
16343 : case RELKIND_PROPGRAPH:
16344 : /* ok to change owner */
16345 1121 : break;
16346 74 : case RELKIND_INDEX:
16347 74 : if (!recursing)
16348 : {
16349 : /*
16350 : * Because ALTER INDEX OWNER used to be allowed, and in fact
16351 : * is generated by old versions of pg_dump, we give a warning
16352 : * and do nothing rather than erroring out. Also, to avoid
16353 : * unnecessary chatter while restoring those old dumps, say
16354 : * nothing at all if the command would be a no-op anyway.
16355 : */
16356 0 : if (tuple_class->relowner != newOwnerId)
16357 0 : ereport(WARNING,
16358 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16359 : errmsg("cannot change owner of index \"%s\"",
16360 : NameStr(tuple_class->relname)),
16361 : errhint("Change the ownership of the index's table instead.")));
16362 : /* quick hack to exit via the no-op path */
16363 0 : newOwnerId = tuple_class->relowner;
16364 : }
16365 74 : break;
16366 12 : case RELKIND_PARTITIONED_INDEX:
16367 12 : if (recursing)
16368 12 : break;
16369 0 : ereport(ERROR,
16370 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16371 : errmsg("cannot change owner of index \"%s\"",
16372 : NameStr(tuple_class->relname)),
16373 : errhint("Change the ownership of the index's table instead.")));
16374 : break;
16375 65 : case RELKIND_SEQUENCE:
16376 65 : if (!recursing &&
16377 35 : tuple_class->relowner != newOwnerId)
16378 : {
16379 : /* if it's an owned sequence, disallow changing it by itself */
16380 : Oid tableId;
16381 : int32 colId;
16382 :
16383 0 : if (sequenceIsOwned(relationOid, DEPENDENCY_AUTO, &tableId, &colId) ||
16384 0 : sequenceIsOwned(relationOid, DEPENDENCY_INTERNAL, &tableId, &colId))
16385 0 : ereport(ERROR,
16386 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16387 : errmsg("cannot change owner of sequence \"%s\"",
16388 : NameStr(tuple_class->relname)),
16389 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
16390 : NameStr(tuple_class->relname),
16391 : get_rel_name(tableId))));
16392 : }
16393 65 : break;
16394 5 : case RELKIND_COMPOSITE_TYPE:
16395 5 : if (recursing)
16396 5 : break;
16397 0 : ereport(ERROR,
16398 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16399 : errmsg("\"%s\" is a composite type",
16400 : NameStr(tuple_class->relname)),
16401 : /* translator: %s is an SQL ALTER command */
16402 : errhint("Use %s instead.",
16403 : "ALTER TYPE")));
16404 : break;
16405 35 : case RELKIND_TOASTVALUE:
16406 35 : if (recursing)
16407 35 : break;
16408 : pg_fallthrough;
16409 : default:
16410 0 : ereport(ERROR,
16411 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16412 : errmsg("cannot change owner of relation \"%s\"",
16413 : NameStr(tuple_class->relname)),
16414 : errdetail_relkind_not_supported(tuple_class->relkind)));
16415 : }
16416 :
16417 : /*
16418 : * If the new owner is the same as the existing owner, consider the
16419 : * command to have succeeded. This is for dump restoration purposes.
16420 : */
16421 1312 : if (tuple_class->relowner != newOwnerId)
16422 : {
16423 : Datum repl_val[Natts_pg_class];
16424 : bool repl_null[Natts_pg_class];
16425 : bool repl_repl[Natts_pg_class];
16426 : Acl *newAcl;
16427 : Datum aclDatum;
16428 : bool isNull;
16429 : HeapTuple newtuple;
16430 :
16431 : /* skip permission checks when recursing to index or toast table */
16432 388 : if (!recursing)
16433 : {
16434 : /* Superusers can always do it */
16435 206 : if (!superuser())
16436 : {
16437 28 : Oid namespaceOid = tuple_class->relnamespace;
16438 : AclResult aclresult;
16439 :
16440 : /* Otherwise, must be owner of the existing object */
16441 28 : if (!object_ownercheck(RelationRelationId, relationOid, GetUserId()))
16442 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relationOid)),
16443 0 : RelationGetRelationName(target_rel));
16444 :
16445 : /* Must be able to become new owner */
16446 28 : check_can_set_role(GetUserId(), newOwnerId);
16447 :
16448 : /* New owner must have CREATE privilege on namespace */
16449 20 : aclresult = object_aclcheck(NamespaceRelationId, namespaceOid, newOwnerId,
16450 : ACL_CREATE);
16451 20 : if (aclresult != ACLCHECK_OK)
16452 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
16453 0 : get_namespace_name(namespaceOid));
16454 : }
16455 : }
16456 :
16457 380 : memset(repl_null, false, sizeof(repl_null));
16458 380 : memset(repl_repl, false, sizeof(repl_repl));
16459 :
16460 380 : repl_repl[Anum_pg_class_relowner - 1] = true;
16461 380 : repl_val[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(newOwnerId);
16462 :
16463 : /*
16464 : * Determine the modified ACL for the new owner. This is only
16465 : * necessary when the ACL is non-null.
16466 : */
16467 380 : aclDatum = SysCacheGetAttr(RELOID, tuple,
16468 : Anum_pg_class_relacl,
16469 : &isNull);
16470 380 : if (!isNull)
16471 : {
16472 52 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16473 : tuple_class->relowner, newOwnerId);
16474 52 : repl_repl[Anum_pg_class_relacl - 1] = true;
16475 52 : repl_val[Anum_pg_class_relacl - 1] = PointerGetDatum(newAcl);
16476 : }
16477 :
16478 380 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(class_rel), repl_val, repl_null, repl_repl);
16479 :
16480 380 : CatalogTupleUpdate(class_rel, &newtuple->t_self, newtuple);
16481 :
16482 380 : heap_freetuple(newtuple);
16483 :
16484 : /*
16485 : * We must similarly update any per-column ACLs to reflect the new
16486 : * owner; for neatness reasons that's split out as a subroutine.
16487 : */
16488 380 : change_owner_fix_column_acls(relationOid,
16489 : tuple_class->relowner,
16490 : newOwnerId);
16491 :
16492 : /*
16493 : * Update owner dependency reference, if any. A composite type has
16494 : * none, because it's tracked for the pg_type entry instead of here;
16495 : * indexes and TOAST tables don't have their own entries either.
16496 : */
16497 380 : if (tuple_class->relkind != RELKIND_COMPOSITE_TYPE &&
16498 375 : tuple_class->relkind != RELKIND_INDEX &&
16499 301 : tuple_class->relkind != RELKIND_PARTITIONED_INDEX &&
16500 289 : tuple_class->relkind != RELKIND_TOASTVALUE)
16501 254 : changeDependencyOnOwner(RelationRelationId, relationOid,
16502 : newOwnerId);
16503 :
16504 : /*
16505 : * Also change the ownership of the table's row type, if it has one
16506 : */
16507 380 : if (OidIsValid(tuple_class->reltype))
16508 238 : AlterTypeOwnerInternal(tuple_class->reltype, newOwnerId);
16509 :
16510 : /*
16511 : * If we are operating on a table or materialized view, also change
16512 : * the ownership of any indexes and sequences that belong to the
16513 : * relation, as well as its toast table (if it has one).
16514 : */
16515 380 : if (tuple_class->relkind == RELKIND_RELATION ||
16516 201 : tuple_class->relkind == RELKIND_PARTITIONED_TABLE ||
16517 165 : tuple_class->relkind == RELKIND_MATVIEW ||
16518 165 : tuple_class->relkind == RELKIND_TOASTVALUE)
16519 : {
16520 : List *index_oid_list;
16521 : ListCell *i;
16522 :
16523 : /* Find all the indexes belonging to this relation */
16524 250 : index_oid_list = RelationGetIndexList(target_rel);
16525 :
16526 : /* For each index, recursively change its ownership */
16527 336 : foreach(i, index_oid_list)
16528 86 : ATExecChangeOwner(lfirst_oid(i), newOwnerId, true, lockmode);
16529 :
16530 250 : list_free(index_oid_list);
16531 : }
16532 :
16533 : /* If it has a toast table, recurse to change its ownership */
16534 380 : if (tuple_class->reltoastrelid != InvalidOid)
16535 35 : ATExecChangeOwner(tuple_class->reltoastrelid, newOwnerId,
16536 : true, lockmode);
16537 :
16538 : /* If it has dependent sequences, recurse to change them too */
16539 380 : change_owner_recurse_to_sequences(relationOid, newOwnerId, lockmode);
16540 : }
16541 :
16542 1304 : InvokeObjectPostAlterHook(RelationRelationId, relationOid, 0);
16543 :
16544 1304 : ReleaseSysCache(tuple);
16545 1304 : table_close(class_rel, RowExclusiveLock);
16546 1304 : relation_close(target_rel, NoLock);
16547 1304 : }
16548 :
16549 : /*
16550 : * change_owner_fix_column_acls
16551 : *
16552 : * Helper function for ATExecChangeOwner. Scan the columns of the table
16553 : * and fix any non-null column ACLs to reflect the new owner.
16554 : */
16555 : static void
16556 380 : change_owner_fix_column_acls(Oid relationOid, Oid oldOwnerId, Oid newOwnerId)
16557 : {
16558 : Relation attRelation;
16559 : SysScanDesc scan;
16560 : ScanKeyData key[1];
16561 : HeapTuple attributeTuple;
16562 :
16563 380 : attRelation = table_open(AttributeRelationId, RowExclusiveLock);
16564 380 : ScanKeyInit(&key[0],
16565 : Anum_pg_attribute_attrelid,
16566 : BTEqualStrategyNumber, F_OIDEQ,
16567 : ObjectIdGetDatum(relationOid));
16568 380 : scan = systable_beginscan(attRelation, AttributeRelidNumIndexId,
16569 : true, NULL, 1, key);
16570 2731 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
16571 : {
16572 2351 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
16573 : Datum repl_val[Natts_pg_attribute];
16574 : bool repl_null[Natts_pg_attribute];
16575 : bool repl_repl[Natts_pg_attribute];
16576 : Acl *newAcl;
16577 : Datum aclDatum;
16578 : bool isNull;
16579 : HeapTuple newtuple;
16580 :
16581 : /* Ignore dropped columns */
16582 2351 : if (att->attisdropped)
16583 2350 : continue;
16584 :
16585 2351 : aclDatum = heap_getattr(attributeTuple,
16586 : Anum_pg_attribute_attacl,
16587 : RelationGetDescr(attRelation),
16588 : &isNull);
16589 : /* Null ACLs do not require changes */
16590 2351 : if (isNull)
16591 2350 : continue;
16592 :
16593 1 : memset(repl_null, false, sizeof(repl_null));
16594 1 : memset(repl_repl, false, sizeof(repl_repl));
16595 :
16596 1 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16597 : oldOwnerId, newOwnerId);
16598 1 : repl_repl[Anum_pg_attribute_attacl - 1] = true;
16599 1 : repl_val[Anum_pg_attribute_attacl - 1] = PointerGetDatum(newAcl);
16600 :
16601 1 : newtuple = heap_modify_tuple(attributeTuple,
16602 : RelationGetDescr(attRelation),
16603 : repl_val, repl_null, repl_repl);
16604 :
16605 1 : CatalogTupleUpdate(attRelation, &newtuple->t_self, newtuple);
16606 :
16607 1 : heap_freetuple(newtuple);
16608 : }
16609 380 : systable_endscan(scan);
16610 380 : table_close(attRelation, RowExclusiveLock);
16611 380 : }
16612 :
16613 : /*
16614 : * change_owner_recurse_to_sequences
16615 : *
16616 : * Helper function for ATExecChangeOwner. Examines pg_depend searching
16617 : * for sequences that are dependent on serial columns, and changes their
16618 : * ownership.
16619 : */
16620 : static void
16621 380 : change_owner_recurse_to_sequences(Oid relationOid, Oid newOwnerId, LOCKMODE lockmode)
16622 : {
16623 : Relation depRel;
16624 : SysScanDesc scan;
16625 : ScanKeyData key[2];
16626 : HeapTuple tup;
16627 :
16628 : /*
16629 : * SERIAL sequences are those having an auto dependency on one of the
16630 : * table's columns (we don't care *which* column, exactly).
16631 : */
16632 380 : depRel = table_open(DependRelationId, AccessShareLock);
16633 :
16634 380 : ScanKeyInit(&key[0],
16635 : Anum_pg_depend_refclassid,
16636 : BTEqualStrategyNumber, F_OIDEQ,
16637 : ObjectIdGetDatum(RelationRelationId));
16638 380 : ScanKeyInit(&key[1],
16639 : Anum_pg_depend_refobjid,
16640 : BTEqualStrategyNumber, F_OIDEQ,
16641 : ObjectIdGetDatum(relationOid));
16642 : /* we leave refobjsubid unspecified */
16643 :
16644 380 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
16645 : NULL, 2, key);
16646 :
16647 1216 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
16648 : {
16649 836 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
16650 : Relation seqRel;
16651 :
16652 : /* skip dependencies other than auto dependencies on columns */
16653 836 : if (depForm->refobjsubid == 0 ||
16654 342 : depForm->classid != RelationRelationId ||
16655 106 : depForm->objsubid != 0 ||
16656 106 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
16657 730 : continue;
16658 :
16659 : /* Use relation_open just in case it's an index */
16660 106 : seqRel = relation_open(depForm->objid, lockmode);
16661 :
16662 : /* skip non-sequence relations */
16663 106 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
16664 : {
16665 : /* No need to keep the lock */
16666 89 : relation_close(seqRel, lockmode);
16667 89 : continue;
16668 : }
16669 :
16670 : /* We don't need to close the sequence while we alter it. */
16671 17 : ATExecChangeOwner(depForm->objid, newOwnerId, true, lockmode);
16672 :
16673 : /* Now we can close it. Keep the lock till end of transaction. */
16674 17 : relation_close(seqRel, NoLock);
16675 : }
16676 :
16677 380 : systable_endscan(scan);
16678 :
16679 380 : relation_close(depRel, AccessShareLock);
16680 380 : }
16681 :
16682 : /*
16683 : * ALTER TABLE CLUSTER ON
16684 : *
16685 : * The only thing we have to do is to change the indisclustered bits.
16686 : *
16687 : * Return the address of the new clustering index.
16688 : */
16689 : static ObjectAddress
16690 39 : ATExecClusterOn(Relation rel, const char *indexName, LOCKMODE lockmode)
16691 : {
16692 : Oid indexOid;
16693 : ObjectAddress address;
16694 :
16695 39 : indexOid = get_relname_relid(indexName, rel->rd_rel->relnamespace);
16696 :
16697 39 : if (!OidIsValid(indexOid))
16698 0 : ereport(ERROR,
16699 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16700 : errmsg("index \"%s\" for table \"%s\" does not exist",
16701 : indexName, RelationGetRelationName(rel))));
16702 :
16703 : /* Check index is valid to cluster on */
16704 39 : check_index_is_clusterable(rel, indexOid, lockmode);
16705 :
16706 : /* And do the work */
16707 39 : mark_index_clustered(rel, indexOid, false);
16708 :
16709 39 : ObjectAddressSet(address,
16710 : RelationRelationId, indexOid);
16711 :
16712 39 : return address;
16713 : }
16714 :
16715 : /*
16716 : * ALTER TABLE SET WITHOUT CLUSTER
16717 : *
16718 : * We have to find any indexes on the table that have indisclustered bit
16719 : * set and turn it off.
16720 : */
16721 : static void
16722 8 : ATExecDropCluster(Relation rel, LOCKMODE lockmode)
16723 : {
16724 8 : mark_index_clustered(rel, InvalidOid, false);
16725 8 : }
16726 :
16727 : /*
16728 : * Preparation phase for SET ACCESS METHOD
16729 : *
16730 : * Check that the access method exists and determine whether a change is
16731 : * actually needed.
16732 : */
16733 : static void
16734 73 : ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname)
16735 : {
16736 : Oid amoid;
16737 :
16738 : /*
16739 : * Look up the access method name and check that it differs from the
16740 : * table's current AM. If DEFAULT was specified for a partitioned table
16741 : * (amname is NULL), set it to InvalidOid to reset the catalogued AM.
16742 : */
16743 73 : if (amname != NULL)
16744 49 : amoid = get_table_am_oid(amname, false);
16745 24 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
16746 12 : amoid = InvalidOid;
16747 : else
16748 12 : amoid = get_table_am_oid(default_table_access_method, false);
16749 :
16750 : /* if it's a match, phase 3 doesn't need to do anything */
16751 73 : if (rel->rd_rel->relam == amoid)
16752 8 : return;
16753 :
16754 : /* Save info for Phase 3 to do the real work */
16755 65 : tab->rewrite |= AT_REWRITE_ACCESS_METHOD;
16756 65 : tab->newAccessMethod = amoid;
16757 65 : tab->chgAccessMethod = true;
16758 : }
16759 :
16760 : /*
16761 : * Special handling of ALTER TABLE SET ACCESS METHOD for relations with no
16762 : * storage that have an interest in preserving AM.
16763 : *
16764 : * Since these have no storage, setting the access method is a catalog only
16765 : * operation.
16766 : */
16767 : static void
16768 29 : ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId)
16769 : {
16770 : Relation pg_class;
16771 : Oid oldAccessMethodId;
16772 : HeapTuple tuple;
16773 : Form_pg_class rd_rel;
16774 29 : Oid reloid = RelationGetRelid(rel);
16775 :
16776 : /*
16777 : * Shouldn't be called on relations having storage; these are processed in
16778 : * phase 3.
16779 : */
16780 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16781 :
16782 : /* Get a modifiable copy of the relation's pg_class row. */
16783 29 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
16784 :
16785 29 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(reloid));
16786 29 : if (!HeapTupleIsValid(tuple))
16787 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
16788 29 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
16789 :
16790 : /* Update the pg_class row. */
16791 29 : oldAccessMethodId = rd_rel->relam;
16792 29 : rd_rel->relam = newAccessMethodId;
16793 :
16794 : /* Leave if no update required */
16795 29 : if (rd_rel->relam == oldAccessMethodId)
16796 : {
16797 0 : heap_freetuple(tuple);
16798 0 : table_close(pg_class, RowExclusiveLock);
16799 0 : return;
16800 : }
16801 :
16802 29 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
16803 :
16804 : /*
16805 : * Update the dependency on the new access method. No dependency is added
16806 : * if the new access method is InvalidOid (default case). Be very careful
16807 : * that this has to compare the previous value stored in pg_class with the
16808 : * new one.
16809 : */
16810 29 : if (!OidIsValid(oldAccessMethodId) && OidIsValid(rd_rel->relam))
16811 13 : {
16812 : ObjectAddress relobj,
16813 : referenced;
16814 :
16815 : /*
16816 : * New access method is defined and there was no dependency
16817 : * previously, so record a new one.
16818 : */
16819 13 : ObjectAddressSet(relobj, RelationRelationId, reloid);
16820 13 : ObjectAddressSet(referenced, AccessMethodRelationId, rd_rel->relam);
16821 13 : recordDependencyOn(&relobj, &referenced, DEPENDENCY_NORMAL);
16822 : }
16823 16 : else if (OidIsValid(oldAccessMethodId) &&
16824 16 : !OidIsValid(rd_rel->relam))
16825 : {
16826 : /*
16827 : * There was an access method defined, and no new one, so just remove
16828 : * the existing dependency.
16829 : */
16830 8 : deleteDependencyRecordsForClass(RelationRelationId, reloid,
16831 : AccessMethodRelationId,
16832 : DEPENDENCY_NORMAL);
16833 : }
16834 : else
16835 : {
16836 : Assert(OidIsValid(oldAccessMethodId) &&
16837 : OidIsValid(rd_rel->relam));
16838 :
16839 : /* Both are valid, so update the dependency */
16840 8 : changeDependencyFor(RelationRelationId, reloid,
16841 : AccessMethodRelationId,
16842 : oldAccessMethodId, rd_rel->relam);
16843 : }
16844 :
16845 : /* make the relam and dependency changes visible */
16846 29 : CommandCounterIncrement();
16847 :
16848 29 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16849 :
16850 29 : heap_freetuple(tuple);
16851 29 : table_close(pg_class, RowExclusiveLock);
16852 : }
16853 :
16854 : /*
16855 : * ALTER TABLE SET TABLESPACE
16856 : */
16857 : static void
16858 107 : ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel, const char *tablespacename, LOCKMODE lockmode)
16859 : {
16860 : Oid tablespaceId;
16861 :
16862 : /* Check that the tablespace exists */
16863 107 : tablespaceId = get_tablespace_oid(tablespacename, false);
16864 :
16865 : /* Check permissions except when moving to database's default */
16866 107 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
16867 : {
16868 : AclResult aclresult;
16869 :
16870 42 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(), ACL_CREATE);
16871 42 : if (aclresult != ACLCHECK_OK)
16872 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE, tablespacename);
16873 : }
16874 :
16875 : /* Save info for Phase 3 to do the real work */
16876 107 : if (OidIsValid(tab->newTableSpace))
16877 0 : ereport(ERROR,
16878 : (errcode(ERRCODE_SYNTAX_ERROR),
16879 : errmsg("cannot have multiple SET TABLESPACE subcommands")));
16880 :
16881 107 : tab->newTableSpace = tablespaceId;
16882 107 : }
16883 :
16884 : /*
16885 : * Set, reset, or replace reloptions.
16886 : */
16887 : static void
16888 622 : ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
16889 : LOCKMODE lockmode)
16890 : {
16891 : Oid relid;
16892 : Relation pgclass;
16893 : HeapTuple tuple;
16894 : HeapTuple newtuple;
16895 : Datum datum;
16896 : Datum newOptions;
16897 : Datum repl_val[Natts_pg_class];
16898 : bool repl_null[Natts_pg_class];
16899 : bool repl_repl[Natts_pg_class];
16900 622 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
16901 :
16902 622 : if (defList == NIL && operation != AT_ReplaceRelOptions)
16903 0 : return; /* nothing to do */
16904 :
16905 622 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
16906 :
16907 : /* Fetch heap tuple */
16908 622 : relid = RelationGetRelid(rel);
16909 622 : tuple = SearchSysCacheLocked1(RELOID, ObjectIdGetDatum(relid));
16910 622 : if (!HeapTupleIsValid(tuple))
16911 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
16912 :
16913 622 : if (operation == AT_ReplaceRelOptions)
16914 : {
16915 : /*
16916 : * If we're supposed to replace the reloptions list, we just pretend
16917 : * there were none before.
16918 : */
16919 133 : datum = (Datum) 0;
16920 : }
16921 : else
16922 : {
16923 : bool isnull;
16924 :
16925 : /* Get the old reloptions */
16926 489 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16927 : &isnull);
16928 489 : if (isnull)
16929 304 : datum = (Datum) 0;
16930 : }
16931 :
16932 : /* Generate new proposed reloptions (text array) */
16933 622 : newOptions = transformRelOptions(datum, defList, NULL, validnsps, false,
16934 : operation == AT_ResetRelOptions);
16935 :
16936 : /* Validate */
16937 618 : switch (rel->rd_rel->relkind)
16938 : {
16939 342 : case RELKIND_RELATION:
16940 : case RELKIND_MATVIEW:
16941 342 : (void) heap_reloptions(rel->rd_rel->relkind, newOptions, true);
16942 342 : break;
16943 4 : case RELKIND_PARTITIONED_TABLE:
16944 4 : (void) partitioned_table_reloptions(newOptions, true);
16945 0 : break;
16946 201 : case RELKIND_VIEW:
16947 201 : (void) view_reloptions(newOptions, true);
16948 189 : break;
16949 71 : case RELKIND_INDEX:
16950 : case RELKIND_PARTITIONED_INDEX:
16951 71 : (void) index_reloptions(rel->rd_indam->amoptions, newOptions, true);
16952 57 : break;
16953 0 : case RELKIND_TOASTVALUE:
16954 : /* fall through to error -- shouldn't ever get here */
16955 : default:
16956 0 : ereport(ERROR,
16957 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16958 : errmsg("cannot set options for relation \"%s\"",
16959 : RelationGetRelationName(rel)),
16960 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
16961 : break;
16962 : }
16963 :
16964 : /* Special-case validation of view options */
16965 588 : if (rel->rd_rel->relkind == RELKIND_VIEW)
16966 : {
16967 189 : Query *view_query = get_view_query(rel);
16968 189 : List *view_options = untransformRelOptions(newOptions);
16969 : ListCell *cell;
16970 189 : bool check_option = false;
16971 :
16972 257 : foreach(cell, view_options)
16973 : {
16974 68 : DefElem *defel = (DefElem *) lfirst(cell);
16975 :
16976 68 : if (strcmp(defel->defname, "check_option") == 0)
16977 16 : check_option = true;
16978 : }
16979 :
16980 : /*
16981 : * If the check option is specified, look to see if the view is
16982 : * actually auto-updatable or not.
16983 : */
16984 189 : if (check_option)
16985 : {
16986 : const char *view_updatable_error =
16987 16 : view_query_is_auto_updatable(view_query, true);
16988 :
16989 16 : if (view_updatable_error)
16990 0 : ereport(ERROR,
16991 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16992 : errmsg("WITH CHECK OPTION is supported only on automatically updatable views"),
16993 : errhint("%s", _(view_updatable_error))));
16994 : }
16995 : }
16996 :
16997 : /*
16998 : * All we need do here is update the pg_class row; the new options will be
16999 : * propagated into relcaches during post-commit cache inval.
17000 : */
17001 588 : memset(repl_val, 0, sizeof(repl_val));
17002 588 : memset(repl_null, false, sizeof(repl_null));
17003 588 : memset(repl_repl, false, sizeof(repl_repl));
17004 :
17005 588 : if (newOptions != (Datum) 0)
17006 390 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
17007 : else
17008 198 : repl_null[Anum_pg_class_reloptions - 1] = true;
17009 :
17010 588 : repl_repl[Anum_pg_class_reloptions - 1] = true;
17011 :
17012 588 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
17013 : repl_val, repl_null, repl_repl);
17014 :
17015 588 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
17016 588 : UnlockTuple(pgclass, &tuple->t_self, InplaceUpdateTupleLock);
17017 :
17018 588 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17019 :
17020 588 : heap_freetuple(newtuple);
17021 :
17022 588 : ReleaseSysCache(tuple);
17023 :
17024 : /* repeat the whole exercise for the toast table, if there's one */
17025 588 : if (OidIsValid(rel->rd_rel->reltoastrelid))
17026 : {
17027 : Relation toastrel;
17028 180 : Oid toastid = rel->rd_rel->reltoastrelid;
17029 :
17030 180 : toastrel = table_open(toastid, lockmode);
17031 :
17032 : /* Fetch heap tuple */
17033 180 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(toastid));
17034 180 : if (!HeapTupleIsValid(tuple))
17035 0 : elog(ERROR, "cache lookup failed for relation %u", toastid);
17036 :
17037 180 : if (operation == AT_ReplaceRelOptions)
17038 : {
17039 : /*
17040 : * If we're supposed to replace the reloptions list, we just
17041 : * pretend there were none before.
17042 : */
17043 0 : datum = (Datum) 0;
17044 : }
17045 : else
17046 : {
17047 : bool isnull;
17048 :
17049 : /* Get the old reloptions */
17050 180 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
17051 : &isnull);
17052 180 : if (isnull)
17053 156 : datum = (Datum) 0;
17054 : }
17055 :
17056 180 : newOptions = transformRelOptions(datum, defList, "toast", validnsps,
17057 : false, operation == AT_ResetRelOptions);
17058 :
17059 180 : (void) heap_reloptions(RELKIND_TOASTVALUE, newOptions, true);
17060 :
17061 180 : memset(repl_val, 0, sizeof(repl_val));
17062 180 : memset(repl_null, false, sizeof(repl_null));
17063 180 : memset(repl_repl, false, sizeof(repl_repl));
17064 :
17065 180 : if (newOptions != (Datum) 0)
17066 28 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
17067 : else
17068 152 : repl_null[Anum_pg_class_reloptions - 1] = true;
17069 :
17070 180 : repl_repl[Anum_pg_class_reloptions - 1] = true;
17071 :
17072 180 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
17073 : repl_val, repl_null, repl_repl);
17074 :
17075 180 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
17076 :
17077 180 : InvokeObjectPostAlterHookArg(RelationRelationId,
17078 : RelationGetRelid(toastrel), 0,
17079 : InvalidOid, true);
17080 :
17081 180 : heap_freetuple(newtuple);
17082 :
17083 180 : ReleaseSysCache(tuple);
17084 :
17085 180 : table_close(toastrel, NoLock);
17086 : }
17087 :
17088 588 : table_close(pgclass, RowExclusiveLock);
17089 : }
17090 :
17091 : /*
17092 : * Execute ALTER TABLE SET TABLESPACE for cases where there is no tuple
17093 : * rewriting to be done, so we just want to copy the data as fast as possible.
17094 : */
17095 : static void
17096 109 : ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode)
17097 : {
17098 : Relation rel;
17099 : Oid reltoastrelid;
17100 : RelFileNumber newrelfilenumber;
17101 : RelFileLocator newrlocator;
17102 109 : List *reltoastidxids = NIL;
17103 : ListCell *lc;
17104 :
17105 : /*
17106 : * Need lock here in case we are recursing to toast table or index
17107 : */
17108 109 : rel = relation_open(tableOid, lockmode);
17109 :
17110 : /* Check first if relation can be moved to new tablespace */
17111 109 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
17112 : {
17113 5 : InvokeObjectPostAlterHook(RelationRelationId,
17114 : RelationGetRelid(rel), 0);
17115 5 : relation_close(rel, NoLock);
17116 5 : return;
17117 : }
17118 :
17119 104 : reltoastrelid = rel->rd_rel->reltoastrelid;
17120 : /* Fetch the list of indexes on toast relation if necessary */
17121 104 : if (OidIsValid(reltoastrelid))
17122 : {
17123 13 : Relation toastRel = relation_open(reltoastrelid, lockmode);
17124 :
17125 13 : reltoastidxids = RelationGetIndexList(toastRel);
17126 13 : relation_close(toastRel, lockmode);
17127 : }
17128 :
17129 : /*
17130 : * Relfilenumbers are not unique in databases across tablespaces, so we
17131 : * need to allocate a new one in the new tablespace.
17132 : */
17133 104 : newrelfilenumber = GetNewRelFileNumber(newTableSpace, NULL,
17134 104 : rel->rd_rel->relpersistence);
17135 :
17136 : /* Open old and new relation */
17137 104 : newrlocator = rel->rd_locator;
17138 104 : newrlocator.relNumber = newrelfilenumber;
17139 104 : newrlocator.spcOid = newTableSpace;
17140 :
17141 : /* hand off to AM to actually create new rel storage and copy the data */
17142 104 : if (rel->rd_rel->relkind == RELKIND_INDEX)
17143 : {
17144 41 : index_copy_data(rel, newrlocator);
17145 : }
17146 : else
17147 : {
17148 : Assert(RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind));
17149 63 : table_relation_copy_data(rel, &newrlocator);
17150 : }
17151 :
17152 : /*
17153 : * Update the pg_class row.
17154 : *
17155 : * NB: This wouldn't work if ATExecSetTableSpace() were allowed to be
17156 : * executed on pg_class or its indexes (the above copy wouldn't contain
17157 : * the updated pg_class entry), but that's forbidden with
17158 : * CheckRelationTableSpaceMove().
17159 : */
17160 104 : SetRelationTableSpace(rel, newTableSpace, newrelfilenumber);
17161 :
17162 104 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17163 :
17164 104 : RelationAssumeNewRelfilelocator(rel);
17165 :
17166 104 : relation_close(rel, NoLock);
17167 :
17168 : /* Make sure the reltablespace change is visible */
17169 104 : CommandCounterIncrement();
17170 :
17171 : /* Move associated toast relation and/or indexes, too */
17172 104 : if (OidIsValid(reltoastrelid))
17173 13 : ATExecSetTableSpace(reltoastrelid, newTableSpace, lockmode);
17174 117 : foreach(lc, reltoastidxids)
17175 13 : ATExecSetTableSpace(lfirst_oid(lc), newTableSpace, lockmode);
17176 :
17177 : /* Clean up */
17178 104 : list_free(reltoastidxids);
17179 : }
17180 :
17181 : /*
17182 : * Special handling of ALTER TABLE SET TABLESPACE for relations with no
17183 : * storage that have an interest in preserving tablespace.
17184 : *
17185 : * Since these have no storage the tablespace can be updated with a simple
17186 : * metadata only operation to update the tablespace.
17187 : */
17188 : static void
17189 24 : ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace)
17190 : {
17191 : /*
17192 : * Shouldn't be called on relations having storage; these are processed in
17193 : * phase 3.
17194 : */
17195 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
17196 :
17197 : /* check if relation can be moved to its new tablespace */
17198 24 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
17199 : {
17200 0 : InvokeObjectPostAlterHook(RelationRelationId,
17201 : RelationGetRelid(rel),
17202 : 0);
17203 0 : return;
17204 : }
17205 :
17206 : /* Update can be done, so change reltablespace */
17207 20 : SetRelationTableSpace(rel, newTableSpace, InvalidOid);
17208 :
17209 20 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
17210 :
17211 : /* Make sure the reltablespace change is visible */
17212 20 : CommandCounterIncrement();
17213 : }
17214 :
17215 : /*
17216 : * Alter Table ALL ... SET TABLESPACE
17217 : *
17218 : * Allows a user to move all objects of some type in a given tablespace in the
17219 : * current database to another tablespace. Objects can be chosen based on the
17220 : * owner of the object also, to allow users to move only their objects.
17221 : * The user must have CREATE rights on the new tablespace, as usual. The main
17222 : * permissions handling is done by the lower-level table move function.
17223 : *
17224 : * All to-be-moved objects are locked first. If NOWAIT is specified and the
17225 : * lock can't be acquired then we ereport(ERROR).
17226 : */
17227 : Oid
17228 20 : AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
17229 : {
17230 20 : List *relations = NIL;
17231 : ListCell *l;
17232 : ScanKeyData key[1];
17233 : Relation rel;
17234 : TableScanDesc scan;
17235 : HeapTuple tuple;
17236 : Oid orig_tablespaceoid;
17237 : Oid new_tablespaceoid;
17238 20 : List *role_oids = roleSpecsToIds(stmt->roles);
17239 :
17240 : /* Ensure we were not asked to move something we can't */
17241 20 : if (stmt->objtype != OBJECT_TABLE && stmt->objtype != OBJECT_INDEX &&
17242 8 : stmt->objtype != OBJECT_MATVIEW)
17243 0 : ereport(ERROR,
17244 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
17245 : errmsg("only tables, indexes, and materialized views exist in tablespaces")));
17246 :
17247 : /* Get the orig and new tablespace OIDs */
17248 20 : orig_tablespaceoid = get_tablespace_oid(stmt->orig_tablespacename, false);
17249 20 : new_tablespaceoid = get_tablespace_oid(stmt->new_tablespacename, false);
17250 :
17251 : /* Can't move shared relations in to or out of pg_global */
17252 : /* This is also checked by ATExecSetTableSpace, but nice to stop earlier */
17253 20 : if (orig_tablespaceoid == GLOBALTABLESPACE_OID ||
17254 : new_tablespaceoid == GLOBALTABLESPACE_OID)
17255 0 : ereport(ERROR,
17256 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
17257 : errmsg("cannot move relations in to or out of pg_global tablespace")));
17258 :
17259 : /*
17260 : * Must have CREATE rights on the new tablespace, unless it is the
17261 : * database default tablespace (which all users implicitly have CREATE
17262 : * rights on).
17263 : */
17264 20 : if (OidIsValid(new_tablespaceoid) && new_tablespaceoid != MyDatabaseTableSpace)
17265 : {
17266 : AclResult aclresult;
17267 :
17268 0 : aclresult = object_aclcheck(TableSpaceRelationId, new_tablespaceoid, GetUserId(),
17269 : ACL_CREATE);
17270 0 : if (aclresult != ACLCHECK_OK)
17271 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
17272 0 : get_tablespace_name(new_tablespaceoid));
17273 : }
17274 :
17275 : /*
17276 : * Now that the checks are done, check if we should set either to
17277 : * InvalidOid because it is our database's default tablespace.
17278 : */
17279 20 : if (orig_tablespaceoid == MyDatabaseTableSpace)
17280 0 : orig_tablespaceoid = InvalidOid;
17281 :
17282 20 : if (new_tablespaceoid == MyDatabaseTableSpace)
17283 20 : new_tablespaceoid = InvalidOid;
17284 :
17285 : /* no-op */
17286 20 : if (orig_tablespaceoid == new_tablespaceoid)
17287 0 : return new_tablespaceoid;
17288 :
17289 : /*
17290 : * Walk the list of objects in the tablespace and move them. This will
17291 : * only find objects in our database, of course.
17292 : */
17293 20 : ScanKeyInit(&key[0],
17294 : Anum_pg_class_reltablespace,
17295 : BTEqualStrategyNumber, F_OIDEQ,
17296 : ObjectIdGetDatum(orig_tablespaceoid));
17297 :
17298 20 : rel = table_open(RelationRelationId, AccessShareLock);
17299 20 : scan = table_beginscan_catalog(rel, 1, key);
17300 88 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
17301 : {
17302 68 : Form_pg_class relForm = (Form_pg_class) GETSTRUCT(tuple);
17303 68 : Oid relOid = relForm->oid;
17304 :
17305 : /*
17306 : * Do not move objects in pg_catalog as part of this, if an admin
17307 : * really wishes to do so, they can issue the individual ALTER
17308 : * commands directly.
17309 : *
17310 : * Also, explicitly avoid any shared tables, temp tables, or TOAST
17311 : * (TOAST will be moved with the main table).
17312 : */
17313 68 : if (IsCatalogNamespace(relForm->relnamespace) ||
17314 136 : relForm->relisshared ||
17315 136 : isAnyTempNamespace(relForm->relnamespace) ||
17316 68 : IsToastNamespace(relForm->relnamespace))
17317 0 : continue;
17318 :
17319 : /* Only move the object type requested */
17320 68 : if ((stmt->objtype == OBJECT_TABLE &&
17321 40 : relForm->relkind != RELKIND_RELATION &&
17322 24 : relForm->relkind != RELKIND_PARTITIONED_TABLE) ||
17323 44 : (stmt->objtype == OBJECT_INDEX &&
17324 24 : relForm->relkind != RELKIND_INDEX &&
17325 4 : relForm->relkind != RELKIND_PARTITIONED_INDEX) ||
17326 40 : (stmt->objtype == OBJECT_MATVIEW &&
17327 4 : relForm->relkind != RELKIND_MATVIEW))
17328 28 : continue;
17329 :
17330 : /* Check if we are only moving objects owned by certain roles */
17331 40 : if (role_oids != NIL && !list_member_oid(role_oids, relForm->relowner))
17332 0 : continue;
17333 :
17334 : /*
17335 : * Handle permissions-checking here since we are locking the tables
17336 : * and also to avoid doing a bunch of work only to fail part-way. Note
17337 : * that permissions will also be checked by AlterTableInternal().
17338 : *
17339 : * Caller must be considered an owner on the table to move it.
17340 : */
17341 40 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()))
17342 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relOid)),
17343 0 : NameStr(relForm->relname));
17344 :
17345 40 : if (stmt->nowait &&
17346 0 : !ConditionalLockRelationOid(relOid, AccessExclusiveLock))
17347 0 : ereport(ERROR,
17348 : (errcode(ERRCODE_OBJECT_IN_USE),
17349 : errmsg("aborting because lock on relation \"%s.%s\" is not available",
17350 : get_namespace_name(relForm->relnamespace),
17351 : NameStr(relForm->relname))));
17352 : else
17353 40 : LockRelationOid(relOid, AccessExclusiveLock);
17354 :
17355 : /* Add to our list of objects to move */
17356 40 : relations = lappend_oid(relations, relOid);
17357 : }
17358 :
17359 20 : table_endscan(scan);
17360 20 : table_close(rel, AccessShareLock);
17361 :
17362 20 : if (relations == NIL)
17363 8 : ereport(NOTICE,
17364 : (errcode(ERRCODE_NO_DATA_FOUND),
17365 : errmsg("no matching relations in tablespace \"%s\" found",
17366 : orig_tablespaceoid == InvalidOid ? "(database default)" :
17367 : get_tablespace_name(orig_tablespaceoid))));
17368 :
17369 : /* Everything is locked, loop through and move all of the relations. */
17370 60 : foreach(l, relations)
17371 : {
17372 40 : List *cmds = NIL;
17373 40 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
17374 :
17375 40 : cmd->subtype = AT_SetTableSpace;
17376 40 : cmd->name = stmt->new_tablespacename;
17377 :
17378 40 : cmds = lappend(cmds, cmd);
17379 :
17380 40 : EventTriggerAlterTableStart((Node *) stmt);
17381 : /* OID is set by AlterTableInternal */
17382 40 : AlterTableInternal(lfirst_oid(l), cmds, false);
17383 40 : EventTriggerAlterTableEnd();
17384 : }
17385 :
17386 20 : return new_tablespaceoid;
17387 : }
17388 :
17389 : static void
17390 41 : index_copy_data(Relation rel, RelFileLocator newrlocator)
17391 : {
17392 : SMgrRelation dstrel;
17393 :
17394 : /*
17395 : * Since we copy the file directly without looking at the shared buffers,
17396 : * we'd better first flush out any pages of the source relation that are
17397 : * in shared buffers. We assume no new changes will be made while we are
17398 : * holding exclusive lock on the rel.
17399 : */
17400 41 : FlushRelationBuffers(rel);
17401 :
17402 : /*
17403 : * Create and copy all forks of the relation, and schedule unlinking of
17404 : * old physical files.
17405 : *
17406 : * NOTE: any conflict in relfilenumber value will be caught in
17407 : * RelationCreateStorage().
17408 : */
17409 41 : dstrel = RelationCreateStorage(newrlocator, rel->rd_rel->relpersistence, true);
17410 :
17411 : /* copy main fork */
17412 41 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
17413 41 : rel->rd_rel->relpersistence);
17414 :
17415 : /* copy those extra forks that exist */
17416 41 : for (ForkNumber forkNum = MAIN_FORKNUM + 1;
17417 164 : forkNum <= MAX_FORKNUM; forkNum++)
17418 : {
17419 123 : if (smgrexists(RelationGetSmgr(rel), forkNum))
17420 : {
17421 0 : smgrcreate(dstrel, forkNum, false);
17422 :
17423 : /*
17424 : * WAL log creation if the relation is persistent, or this is the
17425 : * init fork of an unlogged relation.
17426 : */
17427 0 : if (RelationIsPermanent(rel) ||
17428 0 : (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
17429 : forkNum == INIT_FORKNUM))
17430 0 : log_smgrcreate(&newrlocator, forkNum);
17431 0 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, forkNum,
17432 0 : rel->rd_rel->relpersistence);
17433 : }
17434 : }
17435 :
17436 : /* drop old relation, and close new one */
17437 41 : RelationDropStorage(rel);
17438 41 : smgrclose(dstrel);
17439 41 : }
17440 :
17441 : /*
17442 : * ALTER TABLE ENABLE/DISABLE TRIGGER
17443 : *
17444 : * We just pass this off to trigger.c.
17445 : */
17446 : static void
17447 191 : ATExecEnableDisableTrigger(Relation rel, const char *trigname,
17448 : char fires_when, bool skip_system, bool recurse,
17449 : LOCKMODE lockmode)
17450 : {
17451 191 : EnableDisableTrigger(rel, trigname, InvalidOid,
17452 : fires_when, skip_system, recurse,
17453 : lockmode);
17454 :
17455 191 : InvokeObjectPostAlterHook(RelationRelationId,
17456 : RelationGetRelid(rel), 0);
17457 191 : }
17458 :
17459 : /*
17460 : * ALTER TABLE ENABLE/DISABLE RULE
17461 : *
17462 : * We just pass this off to rewriteDefine.c.
17463 : */
17464 : static void
17465 29 : ATExecEnableDisableRule(Relation rel, const char *rulename,
17466 : char fires_when, LOCKMODE lockmode)
17467 : {
17468 29 : EnableDisableRule(rel, rulename, fires_when);
17469 :
17470 29 : InvokeObjectPostAlterHook(RelationRelationId,
17471 : RelationGetRelid(rel), 0);
17472 29 : }
17473 :
17474 : /*
17475 : * Preparation phase of [NO] INHERIT
17476 : *
17477 : * Check the relation defined as a child.
17478 : */
17479 : static void
17480 378 : ATPrepChangeInherit(Relation child_rel)
17481 : {
17482 378 : if (child_rel->rd_rel->reloftype)
17483 8 : ereport(ERROR,
17484 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17485 : errmsg("cannot change inheritance of typed table")));
17486 :
17487 370 : if (child_rel->rd_rel->relispartition)
17488 12 : ereport(ERROR,
17489 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17490 : errmsg("cannot change inheritance of a partition")));
17491 358 : }
17492 :
17493 : /*
17494 : * ALTER TABLE INHERIT
17495 : *
17496 : * Return the address of the new parent relation.
17497 : */
17498 : static ObjectAddress
17499 289 : ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode)
17500 : {
17501 : Relation parent_rel;
17502 : List *children;
17503 : ObjectAddress address;
17504 : const char *trigger_name;
17505 :
17506 : /*
17507 : * A self-exclusive lock is needed here. See the similar case in
17508 : * MergeAttributes() for a full explanation.
17509 : */
17510 289 : parent_rel = table_openrv(parent, ShareUpdateExclusiveLock);
17511 :
17512 : /*
17513 : * Must be owner of both parent and child -- child was checked by
17514 : * ATSimplePermissions call in ATPrepCmd
17515 : */
17516 289 : ATSimplePermissions(AT_AddInherit, parent_rel,
17517 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
17518 :
17519 : /* Permanent rels cannot inherit from temporary ones */
17520 289 : if (parent_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17521 4 : child_rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
17522 0 : ereport(ERROR,
17523 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17524 : errmsg("cannot inherit from temporary relation \"%s\"",
17525 : RelationGetRelationName(parent_rel))));
17526 :
17527 : /* If parent rel is temp, it must belong to this session */
17528 289 : if (RELATION_IS_OTHER_TEMP(parent_rel))
17529 0 : ereport(ERROR,
17530 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17531 : errmsg("cannot inherit from temporary relation of another session")));
17532 :
17533 : /* Ditto for the child */
17534 289 : if (RELATION_IS_OTHER_TEMP(child_rel))
17535 0 : ereport(ERROR,
17536 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17537 : errmsg("cannot inherit to temporary relation of another session")));
17538 :
17539 : /* Prevent partitioned tables from becoming inheritance parents */
17540 289 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17541 4 : ereport(ERROR,
17542 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17543 : errmsg("cannot inherit from partitioned table \"%s\"",
17544 : parent->relname)));
17545 :
17546 : /* Likewise for partitions */
17547 285 : if (parent_rel->rd_rel->relispartition)
17548 4 : ereport(ERROR,
17549 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17550 : errmsg("cannot inherit from a partition")));
17551 :
17552 : /*
17553 : * Prevent circularity by seeing if proposed parent inherits from child.
17554 : * (In particular, this disallows making a rel inherit from itself.)
17555 : *
17556 : * This is not completely bulletproof because of race conditions: in
17557 : * multi-level inheritance trees, someone else could concurrently be
17558 : * making another inheritance link that closes the loop but does not join
17559 : * either of the rels we have locked. Preventing that seems to require
17560 : * exclusive locks on the entire inheritance tree, which is a cure worse
17561 : * than the disease. find_all_inheritors() will cope with circularity
17562 : * anyway, so don't sweat it too much.
17563 : *
17564 : * We use weakest lock we can on child's children, namely AccessShareLock.
17565 : */
17566 281 : children = find_all_inheritors(RelationGetRelid(child_rel),
17567 : AccessShareLock, NULL);
17568 :
17569 281 : if (list_member_oid(children, RelationGetRelid(parent_rel)))
17570 8 : ereport(ERROR,
17571 : (errcode(ERRCODE_DUPLICATE_TABLE),
17572 : errmsg("circular inheritance not allowed"),
17573 : errdetail("\"%s\" is already a child of \"%s\".",
17574 : parent->relname,
17575 : RelationGetRelationName(child_rel))));
17576 :
17577 : /*
17578 : * If child_rel has row-level triggers with transition tables, we
17579 : * currently don't allow it to become an inheritance child. See also
17580 : * prohibitions in ATExecAttachPartition() and CreateTrigger().
17581 : */
17582 273 : trigger_name = FindTriggerIncompatibleWithInheritance(child_rel->trigdesc);
17583 273 : if (trigger_name != NULL)
17584 4 : ereport(ERROR,
17585 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
17586 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming an inheritance child",
17587 : trigger_name, RelationGetRelationName(child_rel)),
17588 : errdetail("ROW triggers with transition tables are not supported in inheritance hierarchies.")));
17589 :
17590 : /* OK to create inheritance */
17591 269 : CreateInheritance(child_rel, parent_rel, false);
17592 :
17593 209 : ObjectAddressSet(address, RelationRelationId,
17594 : RelationGetRelid(parent_rel));
17595 :
17596 : /* keep our lock on the parent relation until commit */
17597 209 : table_close(parent_rel, NoLock);
17598 :
17599 209 : return address;
17600 : }
17601 :
17602 : /*
17603 : * CreateInheritance
17604 : * Catalog manipulation portion of creating inheritance between a child
17605 : * table and a parent table.
17606 : *
17607 : * This verifies that all the columns and check constraints of the parent
17608 : * appear in the child and that they have the same data types and expressions.
17609 : *
17610 : * Common to ATExecAddInherit() and ATExecAttachPartition().
17611 : */
17612 : static void
17613 2175 : CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition)
17614 : {
17615 : Relation catalogRelation;
17616 : SysScanDesc scan;
17617 : ScanKeyData key;
17618 : HeapTuple inheritsTuple;
17619 : int32 inhseqno;
17620 :
17621 : /* Note: get RowExclusiveLock because we will write pg_inherits below. */
17622 2175 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17623 :
17624 : /*
17625 : * Check for duplicates in the list of parents, and determine the highest
17626 : * inhseqno already present; we'll use the next one for the new parent.
17627 : * Also, if proposed child is a partition, it cannot already be
17628 : * inheriting.
17629 : *
17630 : * Note: we do not reject the case where the child already inherits from
17631 : * the parent indirectly; CREATE TABLE doesn't reject comparable cases.
17632 : */
17633 2175 : ScanKeyInit(&key,
17634 : Anum_pg_inherits_inhrelid,
17635 : BTEqualStrategyNumber, F_OIDEQ,
17636 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17637 2175 : scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId,
17638 : true, NULL, 1, &key);
17639 :
17640 : /* inhseqno sequences start at 1 */
17641 2175 : inhseqno = 0;
17642 2218 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17643 : {
17644 47 : Form_pg_inherits inh = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17645 :
17646 47 : if (inh->inhparent == RelationGetRelid(parent_rel))
17647 4 : ereport(ERROR,
17648 : (errcode(ERRCODE_DUPLICATE_TABLE),
17649 : errmsg("relation \"%s\" would be inherited from more than once",
17650 : RelationGetRelationName(parent_rel))));
17651 :
17652 43 : if (inh->inhseqno > inhseqno)
17653 43 : inhseqno = inh->inhseqno;
17654 : }
17655 2171 : systable_endscan(scan);
17656 :
17657 : /* Match up the columns and bump attinhcount as needed */
17658 2171 : MergeAttributesIntoExisting(child_rel, parent_rel, ispartition);
17659 :
17660 : /* Match up the constraints and bump coninhcount as needed */
17661 2083 : MergeConstraintsIntoExisting(child_rel, parent_rel);
17662 :
17663 : /*
17664 : * OK, it looks valid. Make the catalog entries that show inheritance.
17665 : */
17666 2043 : StoreCatalogInheritance1(RelationGetRelid(child_rel),
17667 : RelationGetRelid(parent_rel),
17668 : inhseqno + 1,
17669 : catalogRelation,
17670 2043 : parent_rel->rd_rel->relkind ==
17671 : RELKIND_PARTITIONED_TABLE);
17672 :
17673 : /* Now we're done with pg_inherits */
17674 2043 : table_close(catalogRelation, RowExclusiveLock);
17675 2043 : }
17676 :
17677 : /*
17678 : * Obtain the source-text form of the constraint expression for a check
17679 : * constraint, given its pg_constraint tuple
17680 : */
17681 : static char *
17682 272 : decompile_conbin(HeapTuple contup, TupleDesc tupdesc)
17683 : {
17684 : Form_pg_constraint con;
17685 : bool isnull;
17686 : Datum attr;
17687 : Datum expr;
17688 :
17689 272 : con = (Form_pg_constraint) GETSTRUCT(contup);
17690 272 : attr = heap_getattr(contup, Anum_pg_constraint_conbin, tupdesc, &isnull);
17691 272 : if (isnull)
17692 0 : elog(ERROR, "null conbin for constraint %u", con->oid);
17693 :
17694 272 : expr = DirectFunctionCall2(pg_get_expr, attr,
17695 : ObjectIdGetDatum(con->conrelid));
17696 272 : return TextDatumGetCString(expr);
17697 : }
17698 :
17699 : /*
17700 : * Determine whether two check constraints are functionally equivalent
17701 : *
17702 : * The test we apply is to see whether they reverse-compile to the same
17703 : * source string. This insulates us from issues like whether attributes
17704 : * have the same physical column numbers in parent and child relations.
17705 : *
17706 : * Note that we ignore enforceability as there are cases where constraints
17707 : * with differing enforceability are allowed.
17708 : */
17709 : static bool
17710 136 : constraints_equivalent(HeapTuple a, HeapTuple b, TupleDesc tupleDesc)
17711 : {
17712 136 : Form_pg_constraint acon = (Form_pg_constraint) GETSTRUCT(a);
17713 136 : Form_pg_constraint bcon = (Form_pg_constraint) GETSTRUCT(b);
17714 :
17715 136 : if (acon->condeferrable != bcon->condeferrable ||
17716 136 : acon->condeferred != bcon->condeferred ||
17717 136 : strcmp(decompile_conbin(a, tupleDesc),
17718 136 : decompile_conbin(b, tupleDesc)) != 0)
17719 4 : return false;
17720 : else
17721 132 : return true;
17722 : }
17723 :
17724 : /*
17725 : * Check columns in child table match up with columns in parent, and increment
17726 : * their attinhcount.
17727 : *
17728 : * Called by CreateInheritance
17729 : *
17730 : * Currently all parent columns must be found in child. Missing columns are an
17731 : * error. One day we might consider creating new columns like CREATE TABLE
17732 : * does. However, that is widely unpopular --- in the common use case of
17733 : * partitioned tables it's a foot-gun.
17734 : *
17735 : * The data type must match exactly. If the parent column is NOT NULL then
17736 : * the child must be as well. Defaults are not compared, however.
17737 : */
17738 : static void
17739 2171 : MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition)
17740 : {
17741 : Relation attrrel;
17742 : TupleDesc parent_desc;
17743 :
17744 2171 : attrrel = table_open(AttributeRelationId, RowExclusiveLock);
17745 2171 : parent_desc = RelationGetDescr(parent_rel);
17746 :
17747 7159 : for (AttrNumber parent_attno = 1; parent_attno <= parent_desc->natts; parent_attno++)
17748 : {
17749 5076 : Form_pg_attribute parent_att = TupleDescAttr(parent_desc, parent_attno - 1);
17750 5076 : char *parent_attname = NameStr(parent_att->attname);
17751 : HeapTuple tuple;
17752 :
17753 : /* Ignore dropped columns in the parent. */
17754 5076 : if (parent_att->attisdropped)
17755 180 : continue;
17756 :
17757 : /* Find same column in child (matching on column name). */
17758 4896 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(child_rel), parent_attname);
17759 4896 : if (HeapTupleIsValid(tuple))
17760 : {
17761 4888 : Form_pg_attribute child_att = (Form_pg_attribute) GETSTRUCT(tuple);
17762 :
17763 4888 : if (parent_att->atttypid != child_att->atttypid ||
17764 4884 : parent_att->atttypmod != child_att->atttypmod)
17765 8 : ereport(ERROR,
17766 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17767 : errmsg("child table \"%s\" has different type for column \"%s\"",
17768 : RelationGetRelationName(child_rel), parent_attname)));
17769 :
17770 4880 : if (parent_att->attcollation != child_att->attcollation)
17771 4 : ereport(ERROR,
17772 : (errcode(ERRCODE_COLLATION_MISMATCH),
17773 : errmsg("child table \"%s\" has different collation for column \"%s\"",
17774 : RelationGetRelationName(child_rel), parent_attname)));
17775 :
17776 : /*
17777 : * If the parent has a not-null constraint that's not NO INHERIT,
17778 : * make sure the child has one too.
17779 : *
17780 : * Other constraints are checked elsewhere.
17781 : */
17782 4876 : if (parent_att->attnotnull && !child_att->attnotnull)
17783 : {
17784 : HeapTuple contup;
17785 :
17786 32 : contup = findNotNullConstraintAttnum(RelationGetRelid(parent_rel),
17787 32 : parent_att->attnum);
17788 32 : if (HeapTupleIsValid(contup) &&
17789 32 : !((Form_pg_constraint) GETSTRUCT(contup))->connoinherit)
17790 20 : ereport(ERROR,
17791 : errcode(ERRCODE_DATATYPE_MISMATCH),
17792 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17793 : parent_attname, RelationGetRelationName(child_rel)));
17794 : }
17795 :
17796 : /*
17797 : * Child column must be generated if and only if parent column is.
17798 : */
17799 4856 : if (parent_att->attgenerated && !child_att->attgenerated)
17800 24 : ereport(ERROR,
17801 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17802 : errmsg("column \"%s\" in child table must be a generated column", parent_attname)));
17803 4832 : if (child_att->attgenerated && !parent_att->attgenerated)
17804 16 : ereport(ERROR,
17805 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17806 : errmsg("column \"%s\" in child table must not be a generated column", parent_attname)));
17807 :
17808 4816 : if (parent_att->attgenerated && child_att->attgenerated && child_att->attgenerated != parent_att->attgenerated)
17809 8 : ereport(ERROR,
17810 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17811 : errmsg("column \"%s\" inherits from generated column of different kind", parent_attname),
17812 : errdetail("Parent column is %s, child column is %s.",
17813 : parent_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
17814 : child_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
17815 :
17816 : /*
17817 : * Regular inheritance children are independent enough not to
17818 : * inherit identity columns. But partitions are integral part of
17819 : * a partitioned table and inherit identity column.
17820 : */
17821 4808 : if (ispartition)
17822 4331 : child_att->attidentity = parent_att->attidentity;
17823 :
17824 : /*
17825 : * OK, bump the child column's inheritance count. (If we fail
17826 : * later on, this change will just roll back.)
17827 : */
17828 4808 : if (pg_add_s16_overflow(child_att->attinhcount, 1,
17829 : &child_att->attinhcount))
17830 0 : ereport(ERROR,
17831 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17832 : errmsg("too many inheritance parents"));
17833 :
17834 : /*
17835 : * In case of partitions, we must enforce that value of attislocal
17836 : * is same in all partitions. (Note: there are only inherited
17837 : * attributes in partitions)
17838 : */
17839 4808 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17840 : {
17841 : Assert(child_att->attinhcount == 1);
17842 4331 : child_att->attislocal = false;
17843 : }
17844 :
17845 4808 : CatalogTupleUpdate(attrrel, &tuple->t_self, tuple);
17846 4808 : heap_freetuple(tuple);
17847 : }
17848 : else
17849 : {
17850 8 : ereport(ERROR,
17851 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17852 : errmsg("child table is missing column \"%s\"", parent_attname)));
17853 : }
17854 : }
17855 :
17856 2083 : table_close(attrrel, RowExclusiveLock);
17857 2083 : }
17858 :
17859 : /*
17860 : * Check constraints in child table match up with constraints in parent,
17861 : * and increment their coninhcount.
17862 : *
17863 : * Constraints that are marked ONLY in the parent are ignored.
17864 : *
17865 : * Called by CreateInheritance
17866 : *
17867 : * Currently all constraints in parent must be present in the child. One day we
17868 : * may consider adding new constraints like CREATE TABLE does.
17869 : *
17870 : * XXX This is O(N^2) which may be an issue with tables with hundreds of
17871 : * constraints. As long as tables have more like 10 constraints it shouldn't be
17872 : * a problem though. Even 100 constraints ought not be the end of the world.
17873 : *
17874 : * XXX See MergeWithExistingConstraint too if you change this code.
17875 : */
17876 : static void
17877 2083 : MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel)
17878 : {
17879 : Relation constraintrel;
17880 : SysScanDesc parent_scan;
17881 : ScanKeyData parent_key;
17882 : HeapTuple parent_tuple;
17883 2083 : Oid parent_relid = RelationGetRelid(parent_rel);
17884 : AttrMap *attmap;
17885 :
17886 2083 : constraintrel = table_open(ConstraintRelationId, RowExclusiveLock);
17887 :
17888 : /* Outer loop scans through the parent's constraint definitions */
17889 2083 : ScanKeyInit(&parent_key,
17890 : Anum_pg_constraint_conrelid,
17891 : BTEqualStrategyNumber, F_OIDEQ,
17892 : ObjectIdGetDatum(parent_relid));
17893 2083 : parent_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17894 : true, NULL, 1, &parent_key);
17895 :
17896 2083 : attmap = build_attrmap_by_name(RelationGetDescr(parent_rel),
17897 : RelationGetDescr(child_rel),
17898 : true);
17899 :
17900 3682 : while (HeapTupleIsValid(parent_tuple = systable_getnext(parent_scan)))
17901 : {
17902 1639 : Form_pg_constraint parent_con = (Form_pg_constraint) GETSTRUCT(parent_tuple);
17903 : SysScanDesc child_scan;
17904 : ScanKeyData child_key;
17905 : HeapTuple child_tuple;
17906 : AttrNumber parent_attno;
17907 1639 : bool found = false;
17908 :
17909 1639 : if (parent_con->contype != CONSTRAINT_CHECK &&
17910 1471 : parent_con->contype != CONSTRAINT_NOTNULL)
17911 762 : continue;
17912 :
17913 : /* if the parent's constraint is marked NO INHERIT, it's not inherited */
17914 909 : if (parent_con->connoinherit)
17915 32 : continue;
17916 :
17917 877 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17918 725 : parent_attno = extractNotNullColumn(parent_tuple);
17919 : else
17920 152 : parent_attno = InvalidAttrNumber;
17921 :
17922 : /* Search for a child constraint matching this one */
17923 877 : ScanKeyInit(&child_key,
17924 : Anum_pg_constraint_conrelid,
17925 : BTEqualStrategyNumber, F_OIDEQ,
17926 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17927 877 : child_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17928 : true, NULL, 1, &child_key);
17929 :
17930 1402 : while (HeapTupleIsValid(child_tuple = systable_getnext(child_scan)))
17931 : {
17932 1386 : Form_pg_constraint child_con = (Form_pg_constraint) GETSTRUCT(child_tuple);
17933 : HeapTuple child_copy;
17934 :
17935 1386 : if (child_con->contype != parent_con->contype)
17936 274 : continue;
17937 :
17938 : /*
17939 : * CHECK constraint are matched by constraint name, NOT NULL ones
17940 : * by attribute number.
17941 : */
17942 1112 : if (child_con->contype == CONSTRAINT_CHECK)
17943 : {
17944 262 : if (strcmp(NameStr(parent_con->conname),
17945 199 : NameStr(child_con->conname)) != 0)
17946 63 : continue;
17947 : }
17948 913 : else if (child_con->contype == CONSTRAINT_NOTNULL)
17949 : {
17950 : Form_pg_attribute parent_attr;
17951 : Form_pg_attribute child_attr;
17952 : AttrNumber child_attno;
17953 :
17954 913 : parent_attr = TupleDescAttr(parent_rel->rd_att, parent_attno - 1);
17955 913 : child_attno = extractNotNullColumn(child_tuple);
17956 913 : if (parent_attno != attmap->attnums[child_attno - 1])
17957 188 : continue;
17958 :
17959 725 : child_attr = TupleDescAttr(child_rel->rd_att, child_attno - 1);
17960 : /* there shouldn't be constraints on dropped columns */
17961 725 : if (parent_attr->attisdropped || child_attr->attisdropped)
17962 0 : elog(ERROR, "found not-null constraint on dropped columns");
17963 : }
17964 :
17965 861 : if (child_con->contype == CONSTRAINT_CHECK &&
17966 136 : !constraints_equivalent(parent_tuple, child_tuple, RelationGetDescr(constraintrel)))
17967 4 : ereport(ERROR,
17968 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17969 : errmsg("child table \"%s\" has different definition for check constraint \"%s\"",
17970 : RelationGetRelationName(child_rel), NameStr(parent_con->conname))));
17971 :
17972 : /*
17973 : * If the child constraint is "no inherit" then cannot merge
17974 : */
17975 857 : if (child_con->connoinherit)
17976 8 : ereport(ERROR,
17977 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17978 : errmsg("constraint \"%s\" conflicts with non-inherited constraint on child table \"%s\"",
17979 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17980 :
17981 : /*
17982 : * If the child constraint is "not valid" then cannot merge with a
17983 : * valid parent constraint
17984 : */
17985 849 : if (parent_con->convalidated && child_con->conenforced &&
17986 769 : !child_con->convalidated)
17987 8 : ereport(ERROR,
17988 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17989 : errmsg("constraint \"%s\" conflicts with NOT VALID constraint on child table \"%s\"",
17990 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17991 :
17992 : /*
17993 : * A NOT ENFORCED child constraint cannot be merged with an
17994 : * ENFORCED parent constraint. However, the reverse is allowed,
17995 : * where the child constraint is ENFORCED.
17996 : */
17997 841 : if (parent_con->conenforced && !child_con->conenforced)
17998 4 : ereport(ERROR,
17999 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
18000 : errmsg("constraint \"%s\" conflicts with NOT ENFORCED constraint on child table \"%s\"",
18001 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
18002 :
18003 : /*
18004 : * OK, bump the child constraint's inheritance count. (If we fail
18005 : * later on, this change will just roll back.)
18006 : */
18007 837 : child_copy = heap_copytuple(child_tuple);
18008 837 : child_con = (Form_pg_constraint) GETSTRUCT(child_copy);
18009 :
18010 837 : if (pg_add_s16_overflow(child_con->coninhcount, 1,
18011 : &child_con->coninhcount))
18012 0 : ereport(ERROR,
18013 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
18014 : errmsg("too many inheritance parents"));
18015 :
18016 : /*
18017 : * In case of partitions, an inherited constraint must be
18018 : * inherited only once since it cannot have multiple parents and
18019 : * it is never considered local.
18020 : */
18021 837 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
18022 : {
18023 : Assert(child_con->coninhcount == 1);
18024 746 : child_con->conislocal = false;
18025 : }
18026 :
18027 837 : CatalogTupleUpdate(constraintrel, &child_copy->t_self, child_copy);
18028 837 : heap_freetuple(child_copy);
18029 :
18030 837 : found = true;
18031 837 : break;
18032 : }
18033 :
18034 853 : systable_endscan(child_scan);
18035 :
18036 853 : if (!found)
18037 : {
18038 16 : if (parent_con->contype == CONSTRAINT_NOTNULL)
18039 0 : ereport(ERROR,
18040 : errcode(ERRCODE_DATATYPE_MISMATCH),
18041 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
18042 : get_attname(parent_relid,
18043 : extractNotNullColumn(parent_tuple),
18044 : false),
18045 : RelationGetRelationName(child_rel)));
18046 :
18047 16 : ereport(ERROR,
18048 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18049 : errmsg("child table is missing constraint \"%s\"",
18050 : NameStr(parent_con->conname))));
18051 : }
18052 : }
18053 :
18054 2043 : systable_endscan(parent_scan);
18055 2043 : table_close(constraintrel, RowExclusiveLock);
18056 2043 : }
18057 :
18058 : /*
18059 : * ALTER TABLE NO INHERIT
18060 : *
18061 : * Return value is the address of the relation that is no longer parent.
18062 : */
18063 : static ObjectAddress
18064 69 : ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode)
18065 : {
18066 : ObjectAddress address;
18067 : Relation parent_rel;
18068 :
18069 : /*
18070 : * AccessShareLock on the parent is probably enough, seeing that DROP
18071 : * TABLE doesn't lock parent tables at all. We need some lock since we'll
18072 : * be inspecting the parent's schema.
18073 : */
18074 69 : parent_rel = table_openrv(parent, AccessShareLock);
18075 :
18076 : /*
18077 : * We don't bother to check ownership of the parent table --- ownership of
18078 : * the child is presumed enough rights.
18079 : */
18080 :
18081 : /* Off to RemoveInheritance() where most of the work happens */
18082 69 : RemoveInheritance(rel, parent_rel, false);
18083 :
18084 65 : ObjectAddressSet(address, RelationRelationId,
18085 : RelationGetRelid(parent_rel));
18086 :
18087 : /* keep our lock on the parent relation until commit */
18088 65 : table_close(parent_rel, NoLock);
18089 :
18090 65 : return address;
18091 : }
18092 :
18093 : /*
18094 : * MarkInheritDetached
18095 : *
18096 : * Set inhdetachpending for a partition, for ATExecDetachPartition
18097 : * in concurrent mode. While at it, verify that no other partition is
18098 : * already pending detach.
18099 : */
18100 : static void
18101 75 : MarkInheritDetached(Relation child_rel, Relation parent_rel)
18102 : {
18103 : Relation catalogRelation;
18104 : SysScanDesc scan;
18105 : ScanKeyData key;
18106 : HeapTuple inheritsTuple;
18107 75 : bool found = false;
18108 :
18109 : Assert(parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
18110 :
18111 : /*
18112 : * Find pg_inherits entries by inhparent. (We need to scan them all in
18113 : * order to verify that no other partition is pending detach.)
18114 : */
18115 75 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
18116 75 : ScanKeyInit(&key,
18117 : Anum_pg_inherits_inhparent,
18118 : BTEqualStrategyNumber, F_OIDEQ,
18119 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
18120 75 : scan = systable_beginscan(catalogRelation, InheritsParentIndexId,
18121 : true, NULL, 1, &key);
18122 :
18123 294 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
18124 : {
18125 : Form_pg_inherits inhForm;
18126 :
18127 145 : inhForm = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
18128 145 : if (inhForm->inhdetachpending)
18129 1 : ereport(ERROR,
18130 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
18131 : errmsg("partition \"%s\" already pending detach in partitioned table \"%s.%s\"",
18132 : get_rel_name(inhForm->inhrelid),
18133 : get_namespace_name(parent_rel->rd_rel->relnamespace),
18134 : RelationGetRelationName(parent_rel)),
18135 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
18136 :
18137 144 : if (inhForm->inhrelid == RelationGetRelid(child_rel))
18138 : {
18139 : HeapTuple newtup;
18140 :
18141 74 : newtup = heap_copytuple(inheritsTuple);
18142 74 : ((Form_pg_inherits) GETSTRUCT(newtup))->inhdetachpending = true;
18143 :
18144 74 : CatalogTupleUpdate(catalogRelation,
18145 74 : &inheritsTuple->t_self,
18146 : newtup);
18147 74 : found = true;
18148 74 : heap_freetuple(newtup);
18149 : /* keep looking, to ensure we catch others pending detach */
18150 : }
18151 : }
18152 :
18153 : /* Done */
18154 74 : systable_endscan(scan);
18155 74 : table_close(catalogRelation, RowExclusiveLock);
18156 :
18157 74 : if (!found)
18158 0 : ereport(ERROR,
18159 : (errcode(ERRCODE_UNDEFINED_TABLE),
18160 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
18161 : RelationGetRelationName(child_rel),
18162 : RelationGetRelationName(parent_rel))));
18163 74 : }
18164 :
18165 : /*
18166 : * RemoveInheritance
18167 : *
18168 : * Drop a parent from the child's parents. This just adjusts the attinhcount
18169 : * and attislocal of the columns and removes the pg_inherit and pg_depend
18170 : * entries. expect_detached is passed down to DeleteInheritsTuple, q.v..
18171 : *
18172 : * If attinhcount goes to 0 then attislocal gets set to true. If it goes back
18173 : * up attislocal stays true, which means if a child is ever removed from a
18174 : * parent then its columns will never be automatically dropped which may
18175 : * surprise. But at least we'll never surprise by dropping columns someone
18176 : * isn't expecting to be dropped which would actually mean data loss.
18177 : *
18178 : * coninhcount and conislocal for inherited constraints are adjusted in
18179 : * exactly the same way.
18180 : *
18181 : * Common to ATExecDropInherit() and ATExecDetachPartition().
18182 : */
18183 : static void
18184 765 : RemoveInheritance(Relation child_rel, Relation parent_rel, bool expect_detached)
18185 : {
18186 : Relation catalogRelation;
18187 : SysScanDesc scan;
18188 : ScanKeyData key[3];
18189 : HeapTuple attributeTuple,
18190 : constraintTuple;
18191 : AttrMap *attmap;
18192 : List *connames;
18193 : List *nncolumns;
18194 : bool found;
18195 : bool is_partitioning;
18196 :
18197 765 : is_partitioning = (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
18198 :
18199 765 : found = DeleteInheritsTuple(RelationGetRelid(child_rel),
18200 : RelationGetRelid(parent_rel),
18201 : expect_detached,
18202 765 : RelationGetRelationName(child_rel));
18203 765 : if (!found)
18204 : {
18205 16 : if (is_partitioning)
18206 12 : ereport(ERROR,
18207 : (errcode(ERRCODE_UNDEFINED_TABLE),
18208 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
18209 : RelationGetRelationName(child_rel),
18210 : RelationGetRelationName(parent_rel))));
18211 : else
18212 4 : ereport(ERROR,
18213 : (errcode(ERRCODE_UNDEFINED_TABLE),
18214 : errmsg("relation \"%s\" is not a parent of relation \"%s\"",
18215 : RelationGetRelationName(parent_rel),
18216 : RelationGetRelationName(child_rel))));
18217 : }
18218 :
18219 : /*
18220 : * Search through child columns looking for ones matching parent rel
18221 : */
18222 749 : catalogRelation = table_open(AttributeRelationId, RowExclusiveLock);
18223 749 : ScanKeyInit(&key[0],
18224 : Anum_pg_attribute_attrelid,
18225 : BTEqualStrategyNumber, F_OIDEQ,
18226 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
18227 749 : scan = systable_beginscan(catalogRelation, AttributeRelidNumIndexId,
18228 : true, NULL, 1, key);
18229 6933 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
18230 : {
18231 6184 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
18232 :
18233 : /* Ignore if dropped or not inherited */
18234 6184 : if (att->attisdropped)
18235 28 : continue;
18236 6156 : if (att->attinhcount <= 0)
18237 4522 : continue;
18238 :
18239 1634 : if (SearchSysCacheExistsAttName(RelationGetRelid(parent_rel),
18240 1634 : NameStr(att->attname)))
18241 : {
18242 : /* Decrement inhcount and possibly set islocal to true */
18243 1598 : HeapTuple copyTuple = heap_copytuple(attributeTuple);
18244 1598 : Form_pg_attribute copy_att = (Form_pg_attribute) GETSTRUCT(copyTuple);
18245 :
18246 1598 : copy_att->attinhcount--;
18247 1598 : if (copy_att->attinhcount == 0)
18248 1578 : copy_att->attislocal = true;
18249 :
18250 1598 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18251 1598 : heap_freetuple(copyTuple);
18252 : }
18253 : }
18254 749 : systable_endscan(scan);
18255 749 : table_close(catalogRelation, RowExclusiveLock);
18256 :
18257 : /*
18258 : * Likewise, find inherited check and not-null constraints and disinherit
18259 : * them. To do this, we first need a list of the names of the parent's
18260 : * check constraints. (We cheat a bit by only checking for name matches,
18261 : * assuming that the expressions will match.)
18262 : *
18263 : * For NOT NULL columns, we store column numbers to match, mapping them in
18264 : * to the child rel's attribute numbers.
18265 : */
18266 749 : attmap = build_attrmap_by_name(RelationGetDescr(child_rel),
18267 : RelationGetDescr(parent_rel),
18268 : false);
18269 :
18270 749 : catalogRelation = table_open(ConstraintRelationId, RowExclusiveLock);
18271 749 : ScanKeyInit(&key[0],
18272 : Anum_pg_constraint_conrelid,
18273 : BTEqualStrategyNumber, F_OIDEQ,
18274 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
18275 749 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18276 : true, NULL, 1, key);
18277 :
18278 749 : connames = NIL;
18279 749 : nncolumns = NIL;
18280 :
18281 1438 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18282 : {
18283 689 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18284 :
18285 689 : if (con->connoinherit)
18286 144 : continue;
18287 :
18288 545 : if (con->contype == CONSTRAINT_CHECK)
18289 76 : connames = lappend(connames, pstrdup(NameStr(con->conname)));
18290 545 : if (con->contype == CONSTRAINT_NOTNULL)
18291 : {
18292 249 : AttrNumber parent_attno = extractNotNullColumn(constraintTuple);
18293 :
18294 249 : nncolumns = lappend_int(nncolumns, attmap->attnums[parent_attno - 1]);
18295 : }
18296 : }
18297 :
18298 749 : systable_endscan(scan);
18299 :
18300 : /* Now scan the child's constraints to find matches */
18301 749 : ScanKeyInit(&key[0],
18302 : Anum_pg_constraint_conrelid,
18303 : BTEqualStrategyNumber, F_OIDEQ,
18304 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
18305 749 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18306 : true, NULL, 1, key);
18307 :
18308 1434 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18309 : {
18310 685 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18311 685 : bool match = false;
18312 :
18313 : /*
18314 : * Match CHECK constraints by name, not-null constraints by column
18315 : * number, and ignore all others.
18316 : */
18317 685 : if (con->contype == CONSTRAINT_CHECK)
18318 : {
18319 228 : foreach_ptr(char, chkname, connames)
18320 : {
18321 80 : if (con->contype == CONSTRAINT_CHECK &&
18322 80 : strcmp(NameStr(con->conname), chkname) == 0)
18323 : {
18324 76 : match = true;
18325 76 : connames = foreach_delete_current(connames, chkname);
18326 76 : break;
18327 : }
18328 : }
18329 : }
18330 573 : else if (con->contype == CONSTRAINT_NOTNULL)
18331 : {
18332 289 : AttrNumber child_attno = extractNotNullColumn(constraintTuple);
18333 :
18334 582 : foreach_int(prevattno, nncolumns)
18335 : {
18336 253 : if (prevattno == child_attno)
18337 : {
18338 249 : match = true;
18339 249 : nncolumns = foreach_delete_current(nncolumns, prevattno);
18340 249 : break;
18341 : }
18342 : }
18343 : }
18344 : else
18345 284 : continue;
18346 :
18347 401 : if (match)
18348 : {
18349 : /* Decrement inhcount and possibly set islocal to true */
18350 325 : HeapTuple copyTuple = heap_copytuple(constraintTuple);
18351 325 : Form_pg_constraint copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
18352 :
18353 325 : if (copy_con->coninhcount <= 0) /* shouldn't happen */
18354 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
18355 : RelationGetRelid(child_rel), NameStr(copy_con->conname));
18356 :
18357 325 : copy_con->coninhcount--;
18358 325 : if (copy_con->coninhcount == 0)
18359 313 : copy_con->conislocal = true;
18360 :
18361 325 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18362 325 : heap_freetuple(copyTuple);
18363 : }
18364 : }
18365 :
18366 : /* We should have matched all constraints */
18367 749 : if (connames != NIL || nncolumns != NIL)
18368 0 : elog(ERROR, "%d unmatched constraints while removing inheritance from \"%s\" to \"%s\"",
18369 : list_length(connames) + list_length(nncolumns),
18370 : RelationGetRelationName(child_rel), RelationGetRelationName(parent_rel));
18371 :
18372 749 : systable_endscan(scan);
18373 749 : table_close(catalogRelation, RowExclusiveLock);
18374 :
18375 749 : drop_parent_dependency(RelationGetRelid(child_rel),
18376 : RelationRelationId,
18377 : RelationGetRelid(parent_rel),
18378 : child_dependency_type(is_partitioning));
18379 :
18380 : /*
18381 : * Post alter hook of this inherits. Since object_access_hook doesn't take
18382 : * multiple object identifiers, we relay oid of parent relation using
18383 : * auxiliary_id argument.
18384 : */
18385 749 : InvokeObjectPostAlterHookArg(InheritsRelationId,
18386 : RelationGetRelid(child_rel), 0,
18387 : RelationGetRelid(parent_rel), false);
18388 749 : }
18389 :
18390 : /*
18391 : * Drop the dependency created by StoreCatalogInheritance1 (CREATE TABLE
18392 : * INHERITS/ALTER TABLE INHERIT -- refclassid will be RelationRelationId) or
18393 : * heap_create_with_catalog (CREATE TABLE OF/ALTER TABLE OF -- refclassid will
18394 : * be TypeRelationId). There's no convenient way to do this, so go trawling
18395 : * through pg_depend.
18396 : */
18397 : static void
18398 757 : drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
18399 : DependencyType deptype)
18400 : {
18401 : Relation catalogRelation;
18402 : SysScanDesc scan;
18403 : ScanKeyData key[3];
18404 : HeapTuple depTuple;
18405 :
18406 757 : catalogRelation = table_open(DependRelationId, RowExclusiveLock);
18407 :
18408 757 : ScanKeyInit(&key[0],
18409 : Anum_pg_depend_classid,
18410 : BTEqualStrategyNumber, F_OIDEQ,
18411 : ObjectIdGetDatum(RelationRelationId));
18412 757 : ScanKeyInit(&key[1],
18413 : Anum_pg_depend_objid,
18414 : BTEqualStrategyNumber, F_OIDEQ,
18415 : ObjectIdGetDatum(relid));
18416 757 : ScanKeyInit(&key[2],
18417 : Anum_pg_depend_objsubid,
18418 : BTEqualStrategyNumber, F_INT4EQ,
18419 : Int32GetDatum(0));
18420 :
18421 757 : scan = systable_beginscan(catalogRelation, DependDependerIndexId, true,
18422 : NULL, 3, key);
18423 :
18424 2324 : while (HeapTupleIsValid(depTuple = systable_getnext(scan)))
18425 : {
18426 1567 : Form_pg_depend dep = (Form_pg_depend) GETSTRUCT(depTuple);
18427 :
18428 1567 : if (dep->refclassid == refclassid &&
18429 785 : dep->refobjid == refobjid &&
18430 757 : dep->refobjsubid == 0 &&
18431 757 : dep->deptype == deptype)
18432 757 : CatalogTupleDelete(catalogRelation, &depTuple->t_self);
18433 : }
18434 :
18435 757 : systable_endscan(scan);
18436 757 : table_close(catalogRelation, RowExclusiveLock);
18437 757 : }
18438 :
18439 : /*
18440 : * ALTER TABLE OF
18441 : *
18442 : * Attach a table to a composite type, as though it had been created with CREATE
18443 : * TABLE OF. All attname, atttypid, atttypmod and attcollation must match. The
18444 : * subject table must not have inheritance parents. These restrictions ensure
18445 : * that you cannot create a configuration impossible with CREATE TABLE OF alone.
18446 : *
18447 : * The address of the type is returned.
18448 : */
18449 : static ObjectAddress
18450 42 : ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode)
18451 : {
18452 42 : Oid relid = RelationGetRelid(rel);
18453 : Type typetuple;
18454 : Form_pg_type typeform;
18455 : Oid typeid;
18456 : Relation inheritsRelation,
18457 : relationRelation;
18458 : SysScanDesc scan;
18459 : ScanKeyData key;
18460 : AttrNumber table_attno,
18461 : type_attno;
18462 : TupleDesc typeTupleDesc,
18463 : tableTupleDesc;
18464 : ObjectAddress tableobj,
18465 : typeobj;
18466 : HeapTuple classtuple;
18467 :
18468 : /* Validate the type. */
18469 42 : typetuple = typenameType(NULL, ofTypename, NULL);
18470 42 : check_of_type(typetuple);
18471 42 : typeform = (Form_pg_type) GETSTRUCT(typetuple);
18472 42 : typeid = typeform->oid;
18473 :
18474 : /* Fail if the table has any inheritance parents. */
18475 42 : inheritsRelation = table_open(InheritsRelationId, AccessShareLock);
18476 42 : ScanKeyInit(&key,
18477 : Anum_pg_inherits_inhrelid,
18478 : BTEqualStrategyNumber, F_OIDEQ,
18479 : ObjectIdGetDatum(relid));
18480 42 : scan = systable_beginscan(inheritsRelation, InheritsRelidSeqnoIndexId,
18481 : true, NULL, 1, &key);
18482 42 : if (HeapTupleIsValid(systable_getnext(scan)))
18483 4 : ereport(ERROR,
18484 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18485 : errmsg("typed tables cannot inherit")));
18486 38 : systable_endscan(scan);
18487 38 : table_close(inheritsRelation, AccessShareLock);
18488 :
18489 : /*
18490 : * Check the tuple descriptors for compatibility. Unlike inheritance, we
18491 : * require that the order also match. However, attnotnull need not match.
18492 : */
18493 38 : typeTupleDesc = lookup_rowtype_tupdesc(typeid, -1);
18494 38 : tableTupleDesc = RelationGetDescr(rel);
18495 38 : table_attno = 1;
18496 121 : for (type_attno = 1; type_attno <= typeTupleDesc->natts; type_attno++)
18497 : {
18498 : Form_pg_attribute type_attr,
18499 : table_attr;
18500 : const char *type_attname,
18501 : *table_attname;
18502 :
18503 : /* Get the next non-dropped type attribute. */
18504 99 : type_attr = TupleDescAttr(typeTupleDesc, type_attno - 1);
18505 99 : if (type_attr->attisdropped)
18506 29 : continue;
18507 70 : type_attname = NameStr(type_attr->attname);
18508 :
18509 : /* Get the next non-dropped table attribute. */
18510 : do
18511 : {
18512 78 : if (table_attno > tableTupleDesc->natts)
18513 4 : ereport(ERROR,
18514 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18515 : errmsg("table is missing column \"%s\"",
18516 : type_attname)));
18517 74 : table_attr = TupleDescAttr(tableTupleDesc, table_attno - 1);
18518 74 : table_attno++;
18519 74 : } while (table_attr->attisdropped);
18520 66 : table_attname = NameStr(table_attr->attname);
18521 :
18522 : /* Compare name. */
18523 66 : if (strncmp(table_attname, type_attname, NAMEDATALEN) != 0)
18524 4 : ereport(ERROR,
18525 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18526 : errmsg("table has column \"%s\" where type requires \"%s\"",
18527 : table_attname, type_attname)));
18528 :
18529 : /* Compare type. */
18530 62 : if (table_attr->atttypid != type_attr->atttypid ||
18531 58 : table_attr->atttypmod != type_attr->atttypmod ||
18532 54 : table_attr->attcollation != type_attr->attcollation)
18533 8 : ereport(ERROR,
18534 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18535 : errmsg("table \"%s\" has different type for column \"%s\"",
18536 : RelationGetRelationName(rel), type_attname)));
18537 : }
18538 22 : ReleaseTupleDesc(typeTupleDesc);
18539 :
18540 : /* Any remaining columns at the end of the table had better be dropped. */
18541 22 : for (; table_attno <= tableTupleDesc->natts; table_attno++)
18542 : {
18543 4 : Form_pg_attribute table_attr = TupleDescAttr(tableTupleDesc,
18544 : table_attno - 1);
18545 :
18546 4 : if (!table_attr->attisdropped)
18547 4 : ereport(ERROR,
18548 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18549 : errmsg("table has extra column \"%s\"",
18550 : NameStr(table_attr->attname))));
18551 : }
18552 :
18553 : /* If the table was already typed, drop the existing dependency. */
18554 18 : if (rel->rd_rel->reloftype)
18555 4 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18556 : DEPENDENCY_NORMAL);
18557 :
18558 : /* Record a dependency on the new type. */
18559 18 : tableobj.classId = RelationRelationId;
18560 18 : tableobj.objectId = relid;
18561 18 : tableobj.objectSubId = 0;
18562 18 : typeobj.classId = TypeRelationId;
18563 18 : typeobj.objectId = typeid;
18564 18 : typeobj.objectSubId = 0;
18565 18 : recordDependencyOn(&tableobj, &typeobj, DEPENDENCY_NORMAL);
18566 :
18567 : /* Update pg_class.reloftype */
18568 18 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18569 18 : classtuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18570 18 : if (!HeapTupleIsValid(classtuple))
18571 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18572 18 : ((Form_pg_class) GETSTRUCT(classtuple))->reloftype = typeid;
18573 18 : CatalogTupleUpdate(relationRelation, &classtuple->t_self, classtuple);
18574 :
18575 18 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18576 :
18577 18 : heap_freetuple(classtuple);
18578 18 : table_close(relationRelation, RowExclusiveLock);
18579 :
18580 18 : ReleaseSysCache(typetuple);
18581 :
18582 18 : return typeobj;
18583 : }
18584 :
18585 : /*
18586 : * ALTER TABLE NOT OF
18587 : *
18588 : * Detach a typed table from its originating type. Just clear reloftype and
18589 : * remove the dependency.
18590 : */
18591 : static void
18592 4 : ATExecDropOf(Relation rel, LOCKMODE lockmode)
18593 : {
18594 4 : Oid relid = RelationGetRelid(rel);
18595 : Relation relationRelation;
18596 : HeapTuple tuple;
18597 :
18598 4 : if (!OidIsValid(rel->rd_rel->reloftype))
18599 0 : ereport(ERROR,
18600 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18601 : errmsg("\"%s\" is not a typed table",
18602 : RelationGetRelationName(rel))));
18603 :
18604 : /*
18605 : * We don't bother to check ownership of the type --- ownership of the
18606 : * table is presumed enough rights. No lock required on the type, either.
18607 : */
18608 :
18609 4 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18610 : DEPENDENCY_NORMAL);
18611 :
18612 : /* Clear pg_class.reloftype */
18613 4 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18614 4 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18615 4 : if (!HeapTupleIsValid(tuple))
18616 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18617 4 : ((Form_pg_class) GETSTRUCT(tuple))->reloftype = InvalidOid;
18618 4 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
18619 :
18620 4 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18621 :
18622 4 : heap_freetuple(tuple);
18623 4 : table_close(relationRelation, RowExclusiveLock);
18624 4 : }
18625 :
18626 : /*
18627 : * relation_mark_replica_identity: Update a table's replica identity
18628 : *
18629 : * Iff ri_type = REPLICA_IDENTITY_INDEX, indexOid must be the Oid of a suitable
18630 : * index. Otherwise, it must be InvalidOid.
18631 : *
18632 : * Caller had better hold an exclusive lock on the relation, as the results
18633 : * of running two of these concurrently wouldn't be pretty.
18634 : */
18635 : static void
18636 281 : relation_mark_replica_identity(Relation rel, char ri_type, Oid indexOid,
18637 : bool is_internal)
18638 : {
18639 : Relation pg_index;
18640 : Relation pg_class;
18641 : HeapTuple pg_class_tuple;
18642 : HeapTuple pg_index_tuple;
18643 : Form_pg_class pg_class_form;
18644 : Form_pg_index pg_index_form;
18645 : ListCell *index;
18646 :
18647 : /*
18648 : * Check whether relreplident has changed, and update it if so.
18649 : */
18650 281 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18651 281 : pg_class_tuple = SearchSysCacheCopy1(RELOID,
18652 : ObjectIdGetDatum(RelationGetRelid(rel)));
18653 281 : if (!HeapTupleIsValid(pg_class_tuple))
18654 0 : elog(ERROR, "cache lookup failed for relation \"%s\"",
18655 : RelationGetRelationName(rel));
18656 281 : pg_class_form = (Form_pg_class) GETSTRUCT(pg_class_tuple);
18657 281 : if (pg_class_form->relreplident != ri_type)
18658 : {
18659 248 : pg_class_form->relreplident = ri_type;
18660 248 : CatalogTupleUpdate(pg_class, &pg_class_tuple->t_self, pg_class_tuple);
18661 : }
18662 281 : table_close(pg_class, RowExclusiveLock);
18663 281 : heap_freetuple(pg_class_tuple);
18664 :
18665 : /*
18666 : * Update the per-index indisreplident flags correctly.
18667 : */
18668 281 : pg_index = table_open(IndexRelationId, RowExclusiveLock);
18669 747 : foreach(index, RelationGetIndexList(rel))
18670 : {
18671 466 : Oid thisIndexOid = lfirst_oid(index);
18672 466 : bool dirty = false;
18673 :
18674 466 : pg_index_tuple = SearchSysCacheCopy1(INDEXRELID,
18675 : ObjectIdGetDatum(thisIndexOid));
18676 466 : if (!HeapTupleIsValid(pg_index_tuple))
18677 0 : elog(ERROR, "cache lookup failed for index %u", thisIndexOid);
18678 466 : pg_index_form = (Form_pg_index) GETSTRUCT(pg_index_tuple);
18679 :
18680 466 : if (thisIndexOid == indexOid)
18681 : {
18682 : /* Set the bit if not already set. */
18683 150 : if (!pg_index_form->indisreplident)
18684 : {
18685 138 : dirty = true;
18686 138 : pg_index_form->indisreplident = true;
18687 : }
18688 : }
18689 : else
18690 : {
18691 : /* Unset the bit if set. */
18692 316 : if (pg_index_form->indisreplident)
18693 : {
18694 34 : dirty = true;
18695 34 : pg_index_form->indisreplident = false;
18696 : }
18697 : }
18698 :
18699 466 : if (dirty)
18700 : {
18701 172 : CatalogTupleUpdate(pg_index, &pg_index_tuple->t_self, pg_index_tuple);
18702 172 : InvokeObjectPostAlterHookArg(IndexRelationId, thisIndexOid, 0,
18703 : InvalidOid, is_internal);
18704 :
18705 : /*
18706 : * Invalidate the relcache for the table, so that after we commit
18707 : * all sessions will refresh the table's replica identity index
18708 : * before attempting any UPDATE or DELETE on the table. (If we
18709 : * changed the table's pg_class row above, then a relcache inval
18710 : * is already queued due to that; but we might not have.)
18711 : */
18712 172 : CacheInvalidateRelcache(rel);
18713 : }
18714 466 : heap_freetuple(pg_index_tuple);
18715 : }
18716 :
18717 281 : table_close(pg_index, RowExclusiveLock);
18718 281 : }
18719 :
18720 : /*
18721 : * ALTER TABLE <name> REPLICA IDENTITY ...
18722 : */
18723 : static void
18724 313 : ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode)
18725 : {
18726 : Oid indexOid;
18727 : Relation indexRel;
18728 : int key;
18729 :
18730 313 : if (stmt->identity_type == REPLICA_IDENTITY_DEFAULT)
18731 : {
18732 4 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18733 4 : return;
18734 : }
18735 309 : else if (stmt->identity_type == REPLICA_IDENTITY_FULL)
18736 : {
18737 98 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18738 98 : return;
18739 : }
18740 211 : else if (stmt->identity_type == REPLICA_IDENTITY_NOTHING)
18741 : {
18742 29 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18743 29 : return;
18744 : }
18745 182 : else if (stmt->identity_type == REPLICA_IDENTITY_INDEX)
18746 : {
18747 : /* fallthrough */ ;
18748 : }
18749 : else
18750 0 : elog(ERROR, "unexpected identity type %u", stmt->identity_type);
18751 :
18752 : /* Check that the index exists */
18753 182 : indexOid = get_relname_relid(stmt->name, rel->rd_rel->relnamespace);
18754 182 : if (!OidIsValid(indexOid))
18755 0 : ereport(ERROR,
18756 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18757 : errmsg("index \"%s\" for table \"%s\" does not exist",
18758 : stmt->name, RelationGetRelationName(rel))));
18759 :
18760 182 : indexRel = index_open(indexOid, ShareLock);
18761 :
18762 : /* Check that the index is on the relation we're altering. */
18763 182 : if (indexRel->rd_index == NULL ||
18764 182 : indexRel->rd_index->indrelid != RelationGetRelid(rel))
18765 4 : ereport(ERROR,
18766 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18767 : errmsg("\"%s\" is not an index for table \"%s\"",
18768 : RelationGetRelationName(indexRel),
18769 : RelationGetRelationName(rel))));
18770 :
18771 : /*
18772 : * The AM must support uniqueness, and the index must in fact be unique.
18773 : * If we have a WITHOUT OVERLAPS constraint (identified by uniqueness +
18774 : * exclusion), we can use that too.
18775 : */
18776 178 : if ((!indexRel->rd_indam->amcanunique ||
18777 166 : !indexRel->rd_index->indisunique) &&
18778 16 : !(indexRel->rd_index->indisunique && indexRel->rd_index->indisexclusion))
18779 8 : ereport(ERROR,
18780 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18781 : errmsg("cannot use non-unique index \"%s\" as replica identity",
18782 : RelationGetRelationName(indexRel))));
18783 : /* Deferred indexes are not guaranteed to be always unique. */
18784 170 : if (!indexRel->rd_index->indimmediate)
18785 8 : ereport(ERROR,
18786 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18787 : errmsg("cannot use non-immediate index \"%s\" as replica identity",
18788 : RelationGetRelationName(indexRel))));
18789 : /* Expression indexes aren't supported. */
18790 162 : if (RelationGetIndexExpressions(indexRel) != NIL)
18791 4 : ereport(ERROR,
18792 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18793 : errmsg("cannot use expression index \"%s\" as replica identity",
18794 : RelationGetRelationName(indexRel))));
18795 : /* Predicate indexes aren't supported. */
18796 158 : if (RelationGetIndexPredicate(indexRel) != NIL)
18797 4 : ereport(ERROR,
18798 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18799 : errmsg("cannot use partial index \"%s\" as replica identity",
18800 : RelationGetRelationName(indexRel))));
18801 :
18802 : /* Check index for nullable columns. */
18803 346 : for (key = 0; key < IndexRelationGetNumberOfKeyAttributes(indexRel); key++)
18804 : {
18805 196 : int16 attno = indexRel->rd_index->indkey.values[key];
18806 : Form_pg_attribute attr;
18807 :
18808 : /*
18809 : * Reject any other system columns. (Going forward, we'll disallow
18810 : * indexes containing such columns in the first place, but they might
18811 : * exist in older branches.)
18812 : */
18813 196 : if (attno <= 0)
18814 0 : ereport(ERROR,
18815 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
18816 : errmsg("index \"%s\" cannot be used as replica identity because column %d is a system column",
18817 : RelationGetRelationName(indexRel), attno)));
18818 :
18819 196 : attr = TupleDescAttr(rel->rd_att, attno - 1);
18820 196 : if (!attr->attnotnull)
18821 4 : ereport(ERROR,
18822 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18823 : errmsg("index \"%s\" cannot be used as replica identity because column \"%s\" is nullable",
18824 : RelationGetRelationName(indexRel),
18825 : NameStr(attr->attname))));
18826 : }
18827 :
18828 : /* This index is suitable for use as a replica identity. Mark it. */
18829 150 : relation_mark_replica_identity(rel, stmt->identity_type, indexOid, true);
18830 :
18831 150 : index_close(indexRel, NoLock);
18832 : }
18833 :
18834 : /*
18835 : * ALTER TABLE ENABLE/DISABLE ROW LEVEL SECURITY
18836 : */
18837 : static void
18838 242 : ATExecSetRowSecurity(Relation rel, bool rls)
18839 : {
18840 : Relation pg_class;
18841 : Oid relid;
18842 : HeapTuple tuple;
18843 :
18844 242 : relid = RelationGetRelid(rel);
18845 :
18846 : /* Pull the record for this relation and update it */
18847 242 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18848 :
18849 242 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18850 :
18851 242 : if (!HeapTupleIsValid(tuple))
18852 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18853 :
18854 242 : ((Form_pg_class) GETSTRUCT(tuple))->relrowsecurity = rls;
18855 242 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18856 :
18857 242 : InvokeObjectPostAlterHook(RelationRelationId,
18858 : RelationGetRelid(rel), 0);
18859 :
18860 242 : table_close(pg_class, RowExclusiveLock);
18861 242 : heap_freetuple(tuple);
18862 242 : }
18863 :
18864 : /*
18865 : * ALTER TABLE FORCE/NO FORCE ROW LEVEL SECURITY
18866 : */
18867 : static void
18868 90 : ATExecForceNoForceRowSecurity(Relation rel, bool force_rls)
18869 : {
18870 : Relation pg_class;
18871 : Oid relid;
18872 : HeapTuple tuple;
18873 :
18874 90 : relid = RelationGetRelid(rel);
18875 :
18876 90 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18877 :
18878 90 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18879 :
18880 90 : if (!HeapTupleIsValid(tuple))
18881 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18882 :
18883 90 : ((Form_pg_class) GETSTRUCT(tuple))->relforcerowsecurity = force_rls;
18884 90 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18885 :
18886 90 : InvokeObjectPostAlterHook(RelationRelationId,
18887 : RelationGetRelid(rel), 0);
18888 :
18889 90 : table_close(pg_class, RowExclusiveLock);
18890 90 : heap_freetuple(tuple);
18891 90 : }
18892 :
18893 : /*
18894 : * ALTER FOREIGN TABLE <name> OPTIONS (...)
18895 : */
18896 : static void
18897 31 : ATExecGenericOptions(Relation rel, List *options)
18898 : {
18899 : Relation ftrel;
18900 : ForeignServer *server;
18901 : ForeignDataWrapper *fdw;
18902 : HeapTuple tuple;
18903 : bool isnull;
18904 : Datum repl_val[Natts_pg_foreign_table];
18905 : bool repl_null[Natts_pg_foreign_table];
18906 : bool repl_repl[Natts_pg_foreign_table];
18907 : Datum datum;
18908 : Form_pg_foreign_table tableform;
18909 :
18910 31 : if (options == NIL)
18911 0 : return;
18912 :
18913 31 : ftrel = table_open(ForeignTableRelationId, RowExclusiveLock);
18914 :
18915 31 : tuple = SearchSysCacheCopy1(FOREIGNTABLEREL,
18916 : ObjectIdGetDatum(rel->rd_id));
18917 31 : if (!HeapTupleIsValid(tuple))
18918 0 : ereport(ERROR,
18919 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18920 : errmsg("foreign table \"%s\" does not exist",
18921 : RelationGetRelationName(rel))));
18922 31 : tableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
18923 31 : server = GetForeignServer(tableform->ftserver);
18924 31 : fdw = GetForeignDataWrapper(server->fdwid);
18925 :
18926 31 : memset(repl_val, 0, sizeof(repl_val));
18927 31 : memset(repl_null, false, sizeof(repl_null));
18928 31 : memset(repl_repl, false, sizeof(repl_repl));
18929 :
18930 : /* Extract the current options */
18931 31 : datum = SysCacheGetAttr(FOREIGNTABLEREL,
18932 : tuple,
18933 : Anum_pg_foreign_table_ftoptions,
18934 : &isnull);
18935 31 : if (isnull)
18936 2 : datum = PointerGetDatum(NULL);
18937 :
18938 : /* Transform the options */
18939 31 : datum = transformGenericOptions(ForeignTableRelationId,
18940 : datum,
18941 : options,
18942 : fdw->fdwvalidator);
18943 :
18944 30 : if (DatumGetPointer(datum) != NULL)
18945 30 : repl_val[Anum_pg_foreign_table_ftoptions - 1] = datum;
18946 : else
18947 0 : repl_null[Anum_pg_foreign_table_ftoptions - 1] = true;
18948 :
18949 30 : repl_repl[Anum_pg_foreign_table_ftoptions - 1] = true;
18950 :
18951 : /* Everything looks good - update the tuple */
18952 :
18953 30 : tuple = heap_modify_tuple(tuple, RelationGetDescr(ftrel),
18954 : repl_val, repl_null, repl_repl);
18955 :
18956 30 : CatalogTupleUpdate(ftrel, &tuple->t_self, tuple);
18957 :
18958 : /*
18959 : * Invalidate relcache so that all sessions will refresh any cached plans
18960 : * that might depend on the old options.
18961 : */
18962 30 : CacheInvalidateRelcache(rel);
18963 :
18964 30 : InvokeObjectPostAlterHook(ForeignTableRelationId,
18965 : RelationGetRelid(rel), 0);
18966 :
18967 30 : table_close(ftrel, RowExclusiveLock);
18968 :
18969 30 : heap_freetuple(tuple);
18970 : }
18971 :
18972 : /*
18973 : * ALTER TABLE ALTER COLUMN SET COMPRESSION
18974 : *
18975 : * Return value is the address of the modified column
18976 : */
18977 : static ObjectAddress
18978 47 : ATExecSetCompression(Relation rel,
18979 : const char *column,
18980 : Node *newValue,
18981 : LOCKMODE lockmode)
18982 : {
18983 : Relation attrel;
18984 : HeapTuple tuple;
18985 : Form_pg_attribute atttableform;
18986 : AttrNumber attnum;
18987 : char *compression;
18988 : char cmethod;
18989 : ObjectAddress address;
18990 :
18991 47 : compression = strVal(newValue);
18992 :
18993 47 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
18994 :
18995 : /* copy the cache entry so we can scribble on it below */
18996 47 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), column);
18997 47 : if (!HeapTupleIsValid(tuple))
18998 0 : ereport(ERROR,
18999 : (errcode(ERRCODE_UNDEFINED_COLUMN),
19000 : errmsg("column \"%s\" of relation \"%s\" does not exist",
19001 : column, RelationGetRelationName(rel))));
19002 :
19003 : /* prevent them from altering a system attribute */
19004 47 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
19005 47 : attnum = atttableform->attnum;
19006 47 : if (attnum <= 0)
19007 0 : ereport(ERROR,
19008 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
19009 : errmsg("cannot alter system column \"%s\"", column)));
19010 :
19011 : /*
19012 : * Check that column type is compressible, then get the attribute
19013 : * compression method code
19014 : */
19015 47 : cmethod = GetAttributeCompression(atttableform->atttypid, compression);
19016 :
19017 : /* update pg_attribute entry */
19018 43 : atttableform->attcompression = cmethod;
19019 43 : CatalogTupleUpdate(attrel, &tuple->t_self, tuple);
19020 :
19021 43 : InvokeObjectPostAlterHook(RelationRelationId,
19022 : RelationGetRelid(rel),
19023 : attnum);
19024 :
19025 : /*
19026 : * Apply the change to indexes as well (only for simple index columns,
19027 : * matching behavior of index.c ConstructTupleDescriptor()).
19028 : */
19029 43 : SetIndexStorageProperties(rel, attrel, attnum,
19030 : false, 0,
19031 : true, cmethod,
19032 : lockmode);
19033 :
19034 43 : heap_freetuple(tuple);
19035 :
19036 43 : table_close(attrel, RowExclusiveLock);
19037 :
19038 : /* make changes visible */
19039 43 : CommandCounterIncrement();
19040 :
19041 43 : ObjectAddressSubSet(address, RelationRelationId,
19042 : RelationGetRelid(rel), attnum);
19043 43 : return address;
19044 : }
19045 :
19046 :
19047 : /*
19048 : * Preparation phase for SET LOGGED/UNLOGGED
19049 : *
19050 : * This verifies that we're not trying to change a temp table. Also,
19051 : * existing foreign key constraints are checked to avoid ending up with
19052 : * permanent tables referencing unlogged tables.
19053 : */
19054 : static void
19055 66 : ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel, bool toLogged)
19056 : {
19057 : Relation pg_constraint;
19058 : HeapTuple tuple;
19059 : SysScanDesc scan;
19060 : ScanKeyData skey[1];
19061 :
19062 : /*
19063 : * Disallow changing status for a temp table. Also verify whether we can
19064 : * get away with doing nothing; in such cases we don't need to run the
19065 : * checks below, either.
19066 : */
19067 66 : switch (rel->rd_rel->relpersistence)
19068 : {
19069 0 : case RELPERSISTENCE_TEMP:
19070 0 : ereport(ERROR,
19071 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19072 : errmsg("cannot change logged status of table \"%s\" because it is temporary",
19073 : RelationGetRelationName(rel)),
19074 : errtable(rel)));
19075 : break;
19076 37 : case RELPERSISTENCE_PERMANENT:
19077 37 : if (toLogged)
19078 : /* nothing to do */
19079 8 : return;
19080 33 : break;
19081 29 : case RELPERSISTENCE_UNLOGGED:
19082 29 : if (!toLogged)
19083 : /* nothing to do */
19084 4 : return;
19085 25 : break;
19086 : }
19087 :
19088 : /*
19089 : * Check that the table is not part of any publication when changing to
19090 : * UNLOGGED, as UNLOGGED tables can't be published.
19091 : */
19092 91 : if (!toLogged &&
19093 33 : GetRelationIncludedPublications(RelationGetRelid(rel)) != NIL)
19094 0 : ereport(ERROR,
19095 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
19096 : errmsg("cannot change table \"%s\" to unlogged because it is part of a publication",
19097 : RelationGetRelationName(rel)),
19098 : errdetail("Unlogged relations cannot be replicated.")));
19099 :
19100 : /*
19101 : * Check existing foreign key constraints to preserve the invariant that
19102 : * permanent tables cannot reference unlogged ones. Self-referencing
19103 : * foreign keys can safely be ignored.
19104 : */
19105 58 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
19106 :
19107 : /*
19108 : * Scan conrelid if changing to permanent, else confrelid. This also
19109 : * determines whether a useful index exists.
19110 : */
19111 58 : ScanKeyInit(&skey[0],
19112 : toLogged ? Anum_pg_constraint_conrelid :
19113 : Anum_pg_constraint_confrelid,
19114 : BTEqualStrategyNumber, F_OIDEQ,
19115 : ObjectIdGetDatum(RelationGetRelid(rel)));
19116 58 : scan = systable_beginscan(pg_constraint,
19117 : toLogged ? ConstraintRelidTypidNameIndexId : InvalidOid,
19118 : true, NULL, 1, skey);
19119 :
19120 94 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
19121 : {
19122 44 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
19123 :
19124 44 : if (con->contype == CONSTRAINT_FOREIGN)
19125 : {
19126 : Oid foreignrelid;
19127 : Relation foreignrel;
19128 :
19129 : /* the opposite end of what we used as scankey */
19130 20 : foreignrelid = toLogged ? con->confrelid : con->conrelid;
19131 :
19132 : /* ignore if self-referencing */
19133 20 : if (RelationGetRelid(rel) == foreignrelid)
19134 8 : continue;
19135 :
19136 12 : foreignrel = relation_open(foreignrelid, AccessShareLock);
19137 :
19138 12 : if (toLogged)
19139 : {
19140 4 : if (!RelationIsPermanent(foreignrel))
19141 4 : ereport(ERROR,
19142 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19143 : errmsg("could not change table \"%s\" to logged because it references unlogged table \"%s\"",
19144 : RelationGetRelationName(rel),
19145 : RelationGetRelationName(foreignrel)),
19146 : errtableconstraint(rel, NameStr(con->conname))));
19147 : }
19148 : else
19149 : {
19150 8 : if (RelationIsPermanent(foreignrel))
19151 4 : ereport(ERROR,
19152 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
19153 : errmsg("could not change table \"%s\" to unlogged because it references logged table \"%s\"",
19154 : RelationGetRelationName(rel),
19155 : RelationGetRelationName(foreignrel)),
19156 : errtableconstraint(rel, NameStr(con->conname))));
19157 : }
19158 :
19159 4 : relation_close(foreignrel, AccessShareLock);
19160 : }
19161 : }
19162 :
19163 50 : systable_endscan(scan);
19164 :
19165 50 : table_close(pg_constraint, AccessShareLock);
19166 :
19167 : /* force rewrite if necessary; see comment in ATRewriteTables */
19168 50 : tab->rewrite |= AT_REWRITE_ALTER_PERSISTENCE;
19169 50 : if (toLogged)
19170 21 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
19171 : else
19172 29 : tab->newrelpersistence = RELPERSISTENCE_UNLOGGED;
19173 50 : tab->chgPersistence = true;
19174 : }
19175 :
19176 : /*
19177 : * Execute ALTER TABLE SET SCHEMA
19178 : */
19179 : ObjectAddress
19180 88 : AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
19181 : {
19182 : Relation rel;
19183 : Oid relid;
19184 : Oid oldNspOid;
19185 : Oid nspOid;
19186 : RangeVar *newrv;
19187 : ObjectAddresses *objsMoved;
19188 : ObjectAddress myself;
19189 :
19190 88 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
19191 88 : stmt->missing_ok ? RVR_MISSING_OK : 0,
19192 : RangeVarCallbackForAlterRelation,
19193 : stmt);
19194 :
19195 83 : if (!OidIsValid(relid))
19196 : {
19197 12 : ereport(NOTICE,
19198 : (errmsg("relation \"%s\" does not exist, skipping",
19199 : stmt->relation->relname)));
19200 12 : return InvalidObjectAddress;
19201 : }
19202 :
19203 71 : rel = relation_open(relid, NoLock);
19204 :
19205 71 : oldNspOid = RelationGetNamespace(rel);
19206 :
19207 : /* If it's an owned sequence, disallow moving it by itself. */
19208 71 : if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
19209 : {
19210 : Oid tableId;
19211 : int32 colId;
19212 :
19213 6 : if (sequenceIsOwned(relid, DEPENDENCY_AUTO, &tableId, &colId) ||
19214 1 : sequenceIsOwned(relid, DEPENDENCY_INTERNAL, &tableId, &colId))
19215 4 : ereport(ERROR,
19216 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
19217 : errmsg("cannot move an owned sequence into another schema"),
19218 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
19219 : RelationGetRelationName(rel),
19220 : get_rel_name(tableId))));
19221 : }
19222 :
19223 : /* Get and lock schema OID and check its permissions. */
19224 67 : newrv = makeRangeVar(stmt->newschema, RelationGetRelationName(rel), -1);
19225 67 : nspOid = RangeVarGetAndCheckCreationNamespace(newrv, NoLock, NULL);
19226 :
19227 : /* common checks on switching namespaces */
19228 67 : CheckSetNamespace(oldNspOid, nspOid);
19229 :
19230 67 : objsMoved = new_object_addresses();
19231 67 : AlterTableNamespaceInternal(rel, oldNspOid, nspOid, objsMoved);
19232 63 : free_object_addresses(objsMoved);
19233 :
19234 63 : ObjectAddressSet(myself, RelationRelationId, relid);
19235 :
19236 63 : if (oldschema)
19237 63 : *oldschema = oldNspOid;
19238 :
19239 : /* close rel, but keep lock until commit */
19240 63 : relation_close(rel, NoLock);
19241 :
19242 63 : return myself;
19243 : }
19244 :
19245 : /*
19246 : * The guts of relocating a table or materialized view to another namespace:
19247 : * besides moving the relation itself, its dependent objects are relocated to
19248 : * the new schema.
19249 : */
19250 : void
19251 68 : AlterTableNamespaceInternal(Relation rel, Oid oldNspOid, Oid nspOid,
19252 : ObjectAddresses *objsMoved)
19253 : {
19254 : Relation classRel;
19255 :
19256 : Assert(objsMoved != NULL);
19257 :
19258 : /* OK, modify the pg_class row and pg_depend entry */
19259 68 : classRel = table_open(RelationRelationId, RowExclusiveLock);
19260 :
19261 68 : AlterRelationNamespaceInternal(classRel, RelationGetRelid(rel), oldNspOid,
19262 : nspOid, true, objsMoved);
19263 :
19264 : /* Fix the table's row type too, if it has one */
19265 64 : if (OidIsValid(rel->rd_rel->reltype))
19266 63 : AlterTypeNamespaceInternal(rel->rd_rel->reltype, nspOid,
19267 : false, /* isImplicitArray */
19268 : false, /* ignoreDependent */
19269 : false, /* errorOnTableType */
19270 : objsMoved);
19271 :
19272 : /* Fix other dependent stuff */
19273 64 : AlterIndexNamespaces(classRel, rel, oldNspOid, nspOid, objsMoved);
19274 64 : AlterSeqNamespaces(classRel, rel, oldNspOid, nspOid,
19275 : objsMoved, AccessExclusiveLock);
19276 64 : AlterConstraintNamespaces(RelationGetRelid(rel), oldNspOid, nspOid,
19277 : false, objsMoved);
19278 :
19279 64 : table_close(classRel, RowExclusiveLock);
19280 64 : }
19281 :
19282 : /*
19283 : * The guts of relocating a relation to another namespace: fix the pg_class
19284 : * entry, and the pg_depend entry if any. Caller must already have
19285 : * opened and write-locked pg_class.
19286 : */
19287 : void
19288 135 : AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
19289 : Oid oldNspOid, Oid newNspOid,
19290 : bool hasDependEntry,
19291 : ObjectAddresses *objsMoved)
19292 : {
19293 : HeapTuple classTup;
19294 : Form_pg_class classForm;
19295 : ObjectAddress thisobj;
19296 135 : bool already_done = false;
19297 :
19298 : /* no rel lock for relkind=c so use LOCKTAG_TUPLE */
19299 135 : classTup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(relOid));
19300 135 : if (!HeapTupleIsValid(classTup))
19301 0 : elog(ERROR, "cache lookup failed for relation %u", relOid);
19302 135 : classForm = (Form_pg_class) GETSTRUCT(classTup);
19303 :
19304 : Assert(classForm->relnamespace == oldNspOid);
19305 :
19306 135 : thisobj.classId = RelationRelationId;
19307 135 : thisobj.objectId = relOid;
19308 135 : thisobj.objectSubId = 0;
19309 :
19310 : /*
19311 : * If the object has already been moved, don't move it again. If it's
19312 : * already in the right place, don't move it, but still fire the object
19313 : * access hook.
19314 : */
19315 135 : already_done = object_address_present(&thisobj, objsMoved);
19316 135 : if (!already_done && oldNspOid != newNspOid)
19317 103 : {
19318 107 : ItemPointerData otid = classTup->t_self;
19319 :
19320 : /* check for duplicate name (more friendly than unique-index failure) */
19321 107 : if (get_relname_relid(NameStr(classForm->relname),
19322 : newNspOid) != InvalidOid)
19323 4 : ereport(ERROR,
19324 : (errcode(ERRCODE_DUPLICATE_TABLE),
19325 : errmsg("relation \"%s\" already exists in schema \"%s\"",
19326 : NameStr(classForm->relname),
19327 : get_namespace_name(newNspOid))));
19328 :
19329 : /* classTup is a copy, so OK to scribble on */
19330 103 : classForm->relnamespace = newNspOid;
19331 :
19332 103 : CatalogTupleUpdate(classRel, &otid, classTup);
19333 103 : UnlockTuple(classRel, &otid, InplaceUpdateTupleLock);
19334 :
19335 :
19336 : /* Update dependency on schema if caller said so */
19337 179 : if (hasDependEntry &&
19338 76 : changeDependencyFor(RelationRelationId,
19339 : relOid,
19340 : NamespaceRelationId,
19341 : oldNspOid,
19342 : newNspOid) != 1)
19343 0 : elog(ERROR, "could not change schema dependency for relation \"%s\"",
19344 : NameStr(classForm->relname));
19345 : }
19346 : else
19347 28 : UnlockTuple(classRel, &classTup->t_self, InplaceUpdateTupleLock);
19348 131 : if (!already_done)
19349 : {
19350 131 : add_exact_object_address(&thisobj, objsMoved);
19351 :
19352 131 : InvokeObjectPostAlterHook(RelationRelationId, relOid, 0);
19353 : }
19354 :
19355 131 : heap_freetuple(classTup);
19356 131 : }
19357 :
19358 : /*
19359 : * Move all indexes for the specified relation to another namespace.
19360 : *
19361 : * Note: we assume adequate permission checking was done by the caller,
19362 : * and that the caller has a suitable lock on the owning relation.
19363 : */
19364 : static void
19365 64 : AlterIndexNamespaces(Relation classRel, Relation rel,
19366 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved)
19367 : {
19368 : List *indexList;
19369 : ListCell *l;
19370 :
19371 64 : indexList = RelationGetIndexList(rel);
19372 :
19373 94 : foreach(l, indexList)
19374 : {
19375 30 : Oid indexOid = lfirst_oid(l);
19376 : ObjectAddress thisobj;
19377 :
19378 30 : thisobj.classId = RelationRelationId;
19379 30 : thisobj.objectId = indexOid;
19380 30 : thisobj.objectSubId = 0;
19381 :
19382 : /*
19383 : * Note: currently, the index will not have its own dependency on the
19384 : * namespace, so we don't need to do changeDependencyFor(). There's no
19385 : * row type in pg_type, either.
19386 : *
19387 : * XXX this objsMoved test may be pointless -- surely we have a single
19388 : * dependency link from a relation to each index?
19389 : */
19390 30 : if (!object_address_present(&thisobj, objsMoved))
19391 : {
19392 30 : AlterRelationNamespaceInternal(classRel, indexOid,
19393 : oldNspOid, newNspOid,
19394 : false, objsMoved);
19395 30 : add_exact_object_address(&thisobj, objsMoved);
19396 : }
19397 : }
19398 :
19399 64 : list_free(indexList);
19400 64 : }
19401 :
19402 : /*
19403 : * Move all identity and SERIAL-column sequences of the specified relation to another
19404 : * namespace.
19405 : *
19406 : * Note: we assume adequate permission checking was done by the caller,
19407 : * and that the caller has a suitable lock on the owning relation.
19408 : */
19409 : static void
19410 64 : AlterSeqNamespaces(Relation classRel, Relation rel,
19411 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
19412 : LOCKMODE lockmode)
19413 : {
19414 : Relation depRel;
19415 : SysScanDesc scan;
19416 : ScanKeyData key[2];
19417 : HeapTuple tup;
19418 :
19419 : /*
19420 : * SERIAL sequences are those having an auto dependency on one of the
19421 : * table's columns (we don't care *which* column, exactly).
19422 : */
19423 64 : depRel = table_open(DependRelationId, AccessShareLock);
19424 :
19425 64 : ScanKeyInit(&key[0],
19426 : Anum_pg_depend_refclassid,
19427 : BTEqualStrategyNumber, F_OIDEQ,
19428 : ObjectIdGetDatum(RelationRelationId));
19429 64 : ScanKeyInit(&key[1],
19430 : Anum_pg_depend_refobjid,
19431 : BTEqualStrategyNumber, F_OIDEQ,
19432 : ObjectIdGetDatum(RelationGetRelid(rel)));
19433 : /* we leave refobjsubid unspecified */
19434 :
19435 64 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
19436 : NULL, 2, key);
19437 :
19438 425 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
19439 : {
19440 361 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
19441 : Relation seqRel;
19442 :
19443 : /* skip dependencies other than auto dependencies on columns */
19444 361 : if (depForm->refobjsubid == 0 ||
19445 252 : depForm->classid != RelationRelationId ||
19446 28 : depForm->objsubid != 0 ||
19447 28 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
19448 333 : continue;
19449 :
19450 : /* Use relation_open just in case it's an index */
19451 28 : seqRel = relation_open(depForm->objid, lockmode);
19452 :
19453 : /* skip non-sequence relations */
19454 28 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
19455 : {
19456 : /* No need to keep the lock */
19457 0 : relation_close(seqRel, lockmode);
19458 0 : continue;
19459 : }
19460 :
19461 : /* Fix the pg_class and pg_depend entries */
19462 28 : AlterRelationNamespaceInternal(classRel, depForm->objid,
19463 : oldNspOid, newNspOid,
19464 : true, objsMoved);
19465 :
19466 : /*
19467 : * Sequences used to have entries in pg_type, but no longer do. If we
19468 : * ever re-instate that, we'll need to move the pg_type entry to the
19469 : * new namespace, too (using AlterTypeNamespaceInternal).
19470 : */
19471 : Assert(RelationGetForm(seqRel)->reltype == InvalidOid);
19472 :
19473 : /* Now we can close it. Keep the lock till end of transaction. */
19474 28 : relation_close(seqRel, NoLock);
19475 : }
19476 :
19477 64 : systable_endscan(scan);
19478 :
19479 64 : relation_close(depRel, AccessShareLock);
19480 64 : }
19481 :
19482 :
19483 : /*
19484 : * This code supports
19485 : * CREATE TEMP TABLE ... ON COMMIT { DROP | PRESERVE ROWS | DELETE ROWS }
19486 : *
19487 : * Because we only support this for TEMP tables, it's sufficient to remember
19488 : * the state in a backend-local data structure.
19489 : */
19490 :
19491 : /*
19492 : * Register a newly-created relation's ON COMMIT action.
19493 : */
19494 : void
19495 120 : register_on_commit_action(Oid relid, OnCommitAction action)
19496 : {
19497 : OnCommitItem *oc;
19498 : MemoryContext oldcxt;
19499 :
19500 : /*
19501 : * We needn't bother registering the relation unless there is an ON COMMIT
19502 : * action we need to take.
19503 : */
19504 120 : if (action == ONCOMMIT_NOOP || action == ONCOMMIT_PRESERVE_ROWS)
19505 16 : return;
19506 :
19507 104 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
19508 :
19509 104 : oc = palloc_object(OnCommitItem);
19510 104 : oc->relid = relid;
19511 104 : oc->oncommit = action;
19512 104 : oc->creating_subid = GetCurrentSubTransactionId();
19513 104 : oc->deleting_subid = InvalidSubTransactionId;
19514 :
19515 : /*
19516 : * We use lcons() here so that ON COMMIT actions are processed in reverse
19517 : * order of registration. That might not be essential but it seems
19518 : * reasonable.
19519 : */
19520 104 : on_commits = lcons(oc, on_commits);
19521 :
19522 104 : MemoryContextSwitchTo(oldcxt);
19523 : }
19524 :
19525 : /*
19526 : * Unregister any ON COMMIT action when a relation is deleted.
19527 : *
19528 : * Actually, we only mark the OnCommitItem entry as to be deleted after commit.
19529 : */
19530 : void
19531 32218 : remove_on_commit_action(Oid relid)
19532 : {
19533 : ListCell *l;
19534 :
19535 32331 : foreach(l, on_commits)
19536 : {
19537 205 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19538 :
19539 205 : if (oc->relid == relid)
19540 : {
19541 92 : oc->deleting_subid = GetCurrentSubTransactionId();
19542 92 : break;
19543 : }
19544 : }
19545 32218 : }
19546 :
19547 : /*
19548 : * Perform ON COMMIT actions.
19549 : *
19550 : * This is invoked just before actually committing, since it's possible
19551 : * to encounter errors.
19552 : */
19553 : void
19554 576933 : PreCommit_on_commit_actions(void)
19555 : {
19556 : ListCell *l;
19557 576933 : List *oids_to_truncate = NIL;
19558 576933 : List *oids_to_drop = NIL;
19559 :
19560 577479 : foreach(l, on_commits)
19561 : {
19562 546 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19563 :
19564 : /* Ignore entry if already dropped in this xact */
19565 546 : if (oc->deleting_subid != InvalidSubTransactionId)
19566 49 : continue;
19567 :
19568 497 : switch (oc->oncommit)
19569 : {
19570 0 : case ONCOMMIT_NOOP:
19571 : case ONCOMMIT_PRESERVE_ROWS:
19572 : /* Do nothing (there shouldn't be such entries, actually) */
19573 0 : break;
19574 462 : case ONCOMMIT_DELETE_ROWS:
19575 :
19576 : /*
19577 : * If this transaction hasn't accessed any temporary
19578 : * relations, we can skip truncating ON COMMIT DELETE ROWS
19579 : * tables, as they must still be empty.
19580 : */
19581 462 : if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
19582 298 : oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
19583 462 : break;
19584 35 : case ONCOMMIT_DROP:
19585 35 : oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
19586 35 : break;
19587 : }
19588 : }
19589 :
19590 : /*
19591 : * Truncate relations before dropping so that all dependencies between
19592 : * relations are removed after they are worked on. Doing it like this
19593 : * might be a waste as it is possible that a relation being truncated will
19594 : * be dropped anyway due to its parent being dropped, but this makes the
19595 : * code more robust because of not having to re-check that the relation
19596 : * exists at truncation time.
19597 : */
19598 576933 : if (oids_to_truncate != NIL)
19599 254 : heap_truncate(oids_to_truncate);
19600 :
19601 576929 : if (oids_to_drop != NIL)
19602 : {
19603 31 : ObjectAddresses *targetObjects = new_object_addresses();
19604 :
19605 66 : foreach(l, oids_to_drop)
19606 : {
19607 : ObjectAddress object;
19608 :
19609 35 : object.classId = RelationRelationId;
19610 35 : object.objectId = lfirst_oid(l);
19611 35 : object.objectSubId = 0;
19612 :
19613 : Assert(!object_address_present(&object, targetObjects));
19614 :
19615 35 : add_exact_object_address(&object, targetObjects);
19616 : }
19617 :
19618 : /*
19619 : * Object deletion might involve toast table access (to clean up
19620 : * toasted catalog entries), so ensure we have a valid snapshot.
19621 : */
19622 31 : PushActiveSnapshot(GetTransactionSnapshot());
19623 :
19624 : /*
19625 : * Since this is an automatic drop, rather than one directly initiated
19626 : * by the user, we pass the PERFORM_DELETION_INTERNAL flag.
19627 : */
19628 31 : performMultipleDeletions(targetObjects, DROP_CASCADE,
19629 : PERFORM_DELETION_INTERNAL | PERFORM_DELETION_QUIETLY);
19630 :
19631 31 : PopActiveSnapshot();
19632 :
19633 : #ifdef USE_ASSERT_CHECKING
19634 :
19635 : /*
19636 : * Note that table deletion will call remove_on_commit_action, so the
19637 : * entry should get marked as deleted.
19638 : */
19639 : foreach(l, on_commits)
19640 : {
19641 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19642 :
19643 : if (oc->oncommit != ONCOMMIT_DROP)
19644 : continue;
19645 :
19646 : Assert(oc->deleting_subid != InvalidSubTransactionId);
19647 : }
19648 : #endif
19649 : }
19650 576929 : }
19651 :
19652 : /*
19653 : * Post-commit or post-abort cleanup for ON COMMIT management.
19654 : *
19655 : * All we do here is remove no-longer-needed OnCommitItem entries.
19656 : *
19657 : * During commit, remove entries that were deleted during this transaction;
19658 : * during abort, remove those created during this transaction.
19659 : */
19660 : void
19661 611215 : AtEOXact_on_commit_actions(bool isCommit)
19662 : {
19663 : ListCell *cur_item;
19664 :
19665 611785 : foreach(cur_item, on_commits)
19666 : {
19667 570 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19668 :
19669 642 : if (isCommit ? oc->deleting_subid != InvalidSubTransactionId :
19670 72 : oc->creating_subid != InvalidSubTransactionId)
19671 : {
19672 : /* cur_item must be removed */
19673 104 : on_commits = foreach_delete_current(on_commits, cur_item);
19674 104 : pfree(oc);
19675 : }
19676 : else
19677 : {
19678 : /* cur_item must be preserved */
19679 466 : oc->creating_subid = InvalidSubTransactionId;
19680 466 : oc->deleting_subid = InvalidSubTransactionId;
19681 : }
19682 : }
19683 611215 : }
19684 :
19685 : /*
19686 : * Post-subcommit or post-subabort cleanup for ON COMMIT management.
19687 : *
19688 : * During subabort, we can immediately remove entries created during this
19689 : * subtransaction. During subcommit, just relabel entries marked during
19690 : * this subtransaction as being the parent's responsibility.
19691 : */
19692 : void
19693 11785 : AtEOSubXact_on_commit_actions(bool isCommit, SubTransactionId mySubid,
19694 : SubTransactionId parentSubid)
19695 : {
19696 : ListCell *cur_item;
19697 :
19698 11785 : foreach(cur_item, on_commits)
19699 : {
19700 0 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19701 :
19702 0 : if (!isCommit && oc->creating_subid == mySubid)
19703 : {
19704 : /* cur_item must be removed */
19705 0 : on_commits = foreach_delete_current(on_commits, cur_item);
19706 0 : pfree(oc);
19707 : }
19708 : else
19709 : {
19710 : /* cur_item must be preserved */
19711 0 : if (oc->creating_subid == mySubid)
19712 0 : oc->creating_subid = parentSubid;
19713 0 : if (oc->deleting_subid == mySubid)
19714 0 : oc->deleting_subid = isCommit ? parentSubid : InvalidSubTransactionId;
19715 : }
19716 : }
19717 11785 : }
19718 :
19719 : /*
19720 : * This is intended as a callback for RangeVarGetRelidExtended(). It allows
19721 : * the relation to be locked only if (1) it's a plain or partitioned table,
19722 : * materialized view, or TOAST table and (2) the current user is the owner (or
19723 : * the superuser) or has been granted MAINTAIN. This meets the
19724 : * permission-checking needs of CLUSTER, REINDEX TABLE, and REFRESH
19725 : * MATERIALIZED VIEW; we expose it here so that it can be used by all.
19726 : */
19727 : void
19728 681 : RangeVarCallbackMaintainsTable(const RangeVar *relation,
19729 : Oid relId, Oid oldRelId, void *arg)
19730 : {
19731 : char relkind;
19732 : AclResult aclresult;
19733 :
19734 : /* Nothing to do if the relation was not found. */
19735 681 : if (!OidIsValid(relId))
19736 4 : return;
19737 :
19738 : /*
19739 : * If the relation does exist, check whether it's an index. But note that
19740 : * the relation might have been dropped between the time we did the name
19741 : * lookup and now. In that case, there's nothing to do.
19742 : */
19743 677 : relkind = get_rel_relkind(relId);
19744 677 : if (!relkind)
19745 0 : return;
19746 677 : if (relkind != RELKIND_RELATION && relkind != RELKIND_TOASTVALUE &&
19747 104 : relkind != RELKIND_MATVIEW && relkind != RELKIND_PARTITIONED_TABLE)
19748 18 : ereport(ERROR,
19749 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19750 : errmsg("\"%s\" is not a table or materialized view", relation->relname)));
19751 :
19752 : /* Check permissions */
19753 659 : aclresult = pg_class_aclcheck(relId, GetUserId(), ACL_MAINTAIN);
19754 659 : if (aclresult != ACLCHECK_OK)
19755 20 : aclcheck_error(aclresult,
19756 20 : get_relkind_objtype(get_rel_relkind(relId)),
19757 20 : relation->relname);
19758 : }
19759 :
19760 : /*
19761 : * Callback to RangeVarGetRelidExtended() for TRUNCATE processing.
19762 : */
19763 : static void
19764 1409 : RangeVarCallbackForTruncate(const RangeVar *relation,
19765 : Oid relId, Oid oldRelId, void *arg)
19766 : {
19767 : HeapTuple tuple;
19768 :
19769 : /* Nothing to do if the relation was not found. */
19770 1409 : if (!OidIsValid(relId))
19771 0 : return;
19772 :
19773 1409 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19774 1409 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19775 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19776 :
19777 1409 : truncate_check_rel(relId, (Form_pg_class) GETSTRUCT(tuple));
19778 1406 : truncate_check_perms(relId, (Form_pg_class) GETSTRUCT(tuple));
19779 :
19780 1386 : ReleaseSysCache(tuple);
19781 : }
19782 :
19783 : /*
19784 : * Callback for RangeVarGetRelidExtended(). Checks that the current user is
19785 : * the owner of the relation, or superuser.
19786 : */
19787 : void
19788 11488 : RangeVarCallbackOwnsRelation(const RangeVar *relation,
19789 : Oid relId, Oid oldRelId, void *arg)
19790 : {
19791 : HeapTuple tuple;
19792 :
19793 : /* Nothing to do if the relation was not found. */
19794 11488 : if (!OidIsValid(relId))
19795 17 : return;
19796 :
19797 11471 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19798 11471 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19799 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19800 :
19801 11471 : if (!object_ownercheck(RelationRelationId, relId, GetUserId()))
19802 16 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relId)),
19803 16 : relation->relname);
19804 :
19805 22850 : if (!allowSystemTableMods &&
19806 11395 : IsSystemClass(relId, (Form_pg_class) GETSTRUCT(tuple)))
19807 1 : ereport(ERROR,
19808 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19809 : errmsg("permission denied: \"%s\" is a system catalog",
19810 : relation->relname)));
19811 :
19812 11454 : ReleaseSysCache(tuple);
19813 : }
19814 :
19815 : /*
19816 : * Common RangeVarGetRelid callback for rename, set schema, and alter table
19817 : * processing.
19818 : */
19819 : static void
19820 21726 : RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid, Oid oldrelid,
19821 : void *arg)
19822 : {
19823 21726 : Node *stmt = (Node *) arg;
19824 : ObjectType reltype;
19825 : HeapTuple tuple;
19826 : Form_pg_class classform;
19827 : AclResult aclresult;
19828 : char relkind;
19829 :
19830 21726 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
19831 21726 : if (!HeapTupleIsValid(tuple))
19832 161 : return; /* concurrently dropped */
19833 21565 : classform = (Form_pg_class) GETSTRUCT(tuple);
19834 21565 : relkind = classform->relkind;
19835 :
19836 : /* Must own relation. */
19837 21565 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
19838 56 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
19839 :
19840 : /* No system table modifications unless explicitly allowed. */
19841 21509 : if (!allowSystemTableMods && IsSystemClass(relid, classform))
19842 18 : ereport(ERROR,
19843 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19844 : errmsg("permission denied: \"%s\" is a system catalog",
19845 : rv->relname)));
19846 :
19847 : /*
19848 : * Extract the specified relation type from the statement parse tree.
19849 : *
19850 : * Also, for ALTER .. RENAME, check permissions: the user must (still)
19851 : * have CREATE rights on the containing namespace.
19852 : */
19853 21491 : if (IsA(stmt, RenameStmt))
19854 : {
19855 310 : aclresult = object_aclcheck(NamespaceRelationId, classform->relnamespace,
19856 : GetUserId(), ACL_CREATE);
19857 310 : if (aclresult != ACLCHECK_OK)
19858 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
19859 0 : get_namespace_name(classform->relnamespace));
19860 310 : reltype = ((RenameStmt *) stmt)->renameType;
19861 : }
19862 21181 : else if (IsA(stmt, AlterObjectSchemaStmt))
19863 73 : reltype = ((AlterObjectSchemaStmt *) stmt)->objectType;
19864 :
19865 21108 : else if (IsA(stmt, AlterTableStmt))
19866 21108 : reltype = ((AlterTableStmt *) stmt)->objtype;
19867 : else
19868 : {
19869 0 : elog(ERROR, "unrecognized node type: %d", (int) nodeTag(stmt));
19870 : reltype = OBJECT_TABLE; /* placate compiler */
19871 : }
19872 :
19873 : /*
19874 : * For compatibility with prior releases, we allow ALTER TABLE to be used
19875 : * with most other types of relations (but not composite types). We allow
19876 : * similar flexibility for ALTER INDEX in the case of RENAME, but not
19877 : * otherwise. Otherwise, the user must select the correct form of the
19878 : * command for the relation at issue.
19879 : */
19880 21491 : if (reltype == OBJECT_SEQUENCE && relkind != RELKIND_SEQUENCE)
19881 0 : ereport(ERROR,
19882 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19883 : errmsg("\"%s\" is not a sequence", rv->relname)));
19884 :
19885 21491 : if (reltype == OBJECT_VIEW && relkind != RELKIND_VIEW)
19886 0 : ereport(ERROR,
19887 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19888 : errmsg("\"%s\" is not a view", rv->relname)));
19889 :
19890 21491 : if (reltype == OBJECT_MATVIEW && relkind != RELKIND_MATVIEW)
19891 0 : ereport(ERROR,
19892 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19893 : errmsg("\"%s\" is not a materialized view", rv->relname)));
19894 :
19895 21491 : if (reltype == OBJECT_FOREIGN_TABLE && relkind != RELKIND_FOREIGN_TABLE)
19896 0 : ereport(ERROR,
19897 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19898 : errmsg("\"%s\" is not a foreign table", rv->relname)));
19899 :
19900 21491 : if (reltype == OBJECT_TYPE && relkind != RELKIND_COMPOSITE_TYPE)
19901 0 : ereport(ERROR,
19902 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19903 : errmsg("\"%s\" is not a composite type", rv->relname)));
19904 :
19905 21491 : if (reltype == OBJECT_PROPGRAPH && relkind != RELKIND_PROPGRAPH)
19906 0 : ereport(ERROR,
19907 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19908 : errmsg("\"%s\" is not a property graph", rv->relname)));
19909 :
19910 21491 : if (reltype == OBJECT_INDEX && relkind != RELKIND_INDEX &&
19911 : relkind != RELKIND_PARTITIONED_INDEX
19912 27 : && !IsA(stmt, RenameStmt))
19913 4 : ereport(ERROR,
19914 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19915 : errmsg("\"%s\" is not an index", rv->relname)));
19916 :
19917 : /*
19918 : * Don't allow ALTER TABLE on composite types. We want people to use ALTER
19919 : * TYPE for that.
19920 : */
19921 21487 : if (reltype != OBJECT_TYPE && relkind == RELKIND_COMPOSITE_TYPE)
19922 0 : ereport(ERROR,
19923 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19924 : errmsg("\"%s\" is a composite type", rv->relname),
19925 : /* translator: %s is an SQL ALTER command */
19926 : errhint("Use %s instead.",
19927 : "ALTER TYPE")));
19928 :
19929 : /*
19930 : * Don't allow ALTER TABLE .. SET SCHEMA on relations that can't be moved
19931 : * to a different schema, such as indexes and TOAST tables.
19932 : */
19933 21487 : if (IsA(stmt, AlterObjectSchemaStmt))
19934 : {
19935 73 : if (relkind == RELKIND_INDEX || relkind == RELKIND_PARTITIONED_INDEX)
19936 0 : ereport(ERROR,
19937 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19938 : errmsg("cannot change schema of index \"%s\"",
19939 : rv->relname),
19940 : errhint("Change the schema of the table instead.")));
19941 73 : else if (relkind == RELKIND_COMPOSITE_TYPE)
19942 0 : ereport(ERROR,
19943 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19944 : errmsg("cannot change schema of composite type \"%s\"",
19945 : rv->relname),
19946 : /* translator: %s is an SQL ALTER command */
19947 : errhint("Use %s instead.",
19948 : "ALTER TYPE")));
19949 73 : else if (relkind == RELKIND_TOASTVALUE)
19950 0 : ereport(ERROR,
19951 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19952 : errmsg("cannot change schema of TOAST table \"%s\"",
19953 : rv->relname),
19954 : errhint("Change the schema of the table instead.")));
19955 : }
19956 :
19957 21487 : ReleaseSysCache(tuple);
19958 : }
19959 :
19960 : /*
19961 : * Transform any expressions present in the partition key
19962 : *
19963 : * Returns a transformed PartitionSpec.
19964 : */
19965 : static PartitionSpec *
19966 3538 : transformPartitionSpec(Relation rel, PartitionSpec *partspec)
19967 : {
19968 : PartitionSpec *newspec;
19969 : ParseState *pstate;
19970 : ParseNamespaceItem *nsitem;
19971 : ListCell *l;
19972 :
19973 3538 : newspec = makeNode(PartitionSpec);
19974 :
19975 3538 : newspec->strategy = partspec->strategy;
19976 3538 : newspec->partParams = NIL;
19977 3538 : newspec->location = partspec->location;
19978 :
19979 : /* Check valid number of columns for strategy */
19980 5136 : if (partspec->strategy == PARTITION_STRATEGY_LIST &&
19981 1598 : list_length(partspec->partParams) != 1)
19982 4 : ereport(ERROR,
19983 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19984 : errmsg("cannot use \"list\" partition strategy with more than one column")));
19985 :
19986 : /*
19987 : * Create a dummy ParseState and insert the target relation as its sole
19988 : * rangetable entry. We need a ParseState for transformExpr.
19989 : */
19990 3534 : pstate = make_parsestate(NULL);
19991 3534 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
19992 : NULL, false, true);
19993 3534 : addNSItemToQuery(pstate, nsitem, true, true, true);
19994 :
19995 : /* take care of any partition expressions */
19996 7370 : foreach(l, partspec->partParams)
19997 : {
19998 3852 : PartitionElem *pelem = lfirst_node(PartitionElem, l);
19999 :
20000 3852 : if (pelem->expr)
20001 : {
20002 : /* Copy, to avoid scribbling on the input */
20003 232 : pelem = copyObject(pelem);
20004 :
20005 : /* Now do parse transformation of the expression */
20006 232 : pelem->expr = transformExpr(pstate, pelem->expr,
20007 : EXPR_KIND_PARTITION_EXPRESSION);
20008 :
20009 : /* we have to fix its collations too */
20010 216 : assign_expr_collations(pstate, pelem->expr);
20011 : }
20012 :
20013 3836 : newspec->partParams = lappend(newspec->partParams, pelem);
20014 : }
20015 :
20016 3518 : return newspec;
20017 : }
20018 :
20019 : /*
20020 : * Compute per-partition-column information from a list of PartitionElems.
20021 : * Expressions in the PartitionElems must be parse-analyzed already.
20022 : */
20023 : static void
20024 3518 : ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
20025 : List **partexprs, Oid *partopclass, Oid *partcollation,
20026 : PartitionStrategy strategy)
20027 : {
20028 : int attn;
20029 : ListCell *lc;
20030 : Oid am_oid;
20031 :
20032 3518 : attn = 0;
20033 7266 : foreach(lc, partParams)
20034 : {
20035 3836 : PartitionElem *pelem = lfirst_node(PartitionElem, lc);
20036 : Oid atttype;
20037 : Oid attcollation;
20038 :
20039 3836 : if (pelem->name != NULL)
20040 : {
20041 : /* Simple attribute reference */
20042 : HeapTuple atttuple;
20043 : Form_pg_attribute attform;
20044 :
20045 3620 : atttuple = SearchSysCacheAttName(RelationGetRelid(rel),
20046 3620 : pelem->name);
20047 3620 : if (!HeapTupleIsValid(atttuple))
20048 8 : ereport(ERROR,
20049 : (errcode(ERRCODE_UNDEFINED_COLUMN),
20050 : errmsg("column \"%s\" named in partition key does not exist",
20051 : pelem->name),
20052 : parser_errposition(pstate, pelem->location)));
20053 3612 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
20054 :
20055 3612 : if (attform->attnum <= 0)
20056 4 : ereport(ERROR,
20057 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20058 : errmsg("cannot use system column \"%s\" in partition key",
20059 : pelem->name),
20060 : parser_errposition(pstate, pelem->location)));
20061 :
20062 : /*
20063 : * Stored generated columns cannot work: They are computed after
20064 : * BEFORE triggers, but partition routing is done before all
20065 : * triggers. Maybe virtual generated columns could be made to
20066 : * work, but then they would need to be handled as an expression
20067 : * below.
20068 : */
20069 3608 : if (attform->attgenerated)
20070 8 : ereport(ERROR,
20071 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20072 : errmsg("cannot use generated column in partition key"),
20073 : errdetail("Column \"%s\" is a generated column.",
20074 : pelem->name),
20075 : parser_errposition(pstate, pelem->location)));
20076 :
20077 3600 : partattrs[attn] = attform->attnum;
20078 3600 : atttype = attform->atttypid;
20079 3600 : attcollation = attform->attcollation;
20080 3600 : ReleaseSysCache(atttuple);
20081 : }
20082 : else
20083 : {
20084 : /* Expression */
20085 216 : Node *expr = pelem->expr;
20086 : char partattname[16];
20087 216 : Bitmapset *expr_attrs = NULL;
20088 : int i;
20089 :
20090 : Assert(expr != NULL);
20091 216 : atttype = exprType(expr);
20092 216 : attcollation = exprCollation(expr);
20093 :
20094 : /*
20095 : * The expression must be of a storable type (e.g., not RECORD).
20096 : * The test is the same as for whether a table column is of a safe
20097 : * type (which is why we needn't check for the non-expression
20098 : * case).
20099 : */
20100 216 : snprintf(partattname, sizeof(partattname), "%d", attn + 1);
20101 216 : CheckAttributeType(partattname,
20102 : atttype, attcollation,
20103 : NIL, CHKATYPE_IS_PARTKEY);
20104 :
20105 : /*
20106 : * Strip any top-level COLLATE clause. This ensures that we treat
20107 : * "x COLLATE y" and "(x COLLATE y)" alike.
20108 : */
20109 208 : while (IsA(expr, CollateExpr))
20110 0 : expr = (Node *) ((CollateExpr *) expr)->arg;
20111 :
20112 : /*
20113 : * Examine all the columns in the partition key expression. When
20114 : * the whole-row reference is present, examine all the columns of
20115 : * the partitioned table.
20116 : */
20117 208 : pull_varattnos(expr, 1, &expr_attrs);
20118 208 : if (bms_is_member(0 - FirstLowInvalidHeapAttributeNumber, expr_attrs))
20119 : {
20120 40 : expr_attrs = bms_add_range(expr_attrs,
20121 : 1 - FirstLowInvalidHeapAttributeNumber,
20122 20 : RelationGetNumberOfAttributes(rel) - FirstLowInvalidHeapAttributeNumber);
20123 20 : expr_attrs = bms_del_member(expr_attrs, 0 - FirstLowInvalidHeapAttributeNumber);
20124 : }
20125 :
20126 208 : i = -1;
20127 457 : while ((i = bms_next_member(expr_attrs, i)) >= 0)
20128 : {
20129 281 : AttrNumber attno = i + FirstLowInvalidHeapAttributeNumber;
20130 :
20131 : Assert(attno != 0);
20132 :
20133 : /*
20134 : * Cannot allow system column references, since that would
20135 : * make partition routing impossible: their values won't be
20136 : * known yet when we need to do that.
20137 : */
20138 281 : if (attno < 0)
20139 0 : ereport(ERROR,
20140 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20141 : errmsg("partition key expressions cannot contain system column references")));
20142 :
20143 : /*
20144 : * Stored generated columns cannot work: They are computed
20145 : * after BEFORE triggers, but partition routing is done before
20146 : * all triggers. Virtual generated columns could probably
20147 : * work, but it would require more work elsewhere (for example
20148 : * SET EXPRESSION would need to check whether the column is
20149 : * used in partition keys). Seems safer to prohibit for now.
20150 : */
20151 281 : if (TupleDescAttr(RelationGetDescr(rel), attno - 1)->attgenerated)
20152 32 : ereport(ERROR,
20153 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20154 : errmsg("cannot use generated column in partition key"),
20155 : errdetail("Column \"%s\" is a generated column.",
20156 : get_attname(RelationGetRelid(rel), attno, false)),
20157 : parser_errposition(pstate, pelem->location)));
20158 : }
20159 :
20160 176 : if (IsA(expr, Var) &&
20161 8 : ((Var *) expr)->varattno > 0)
20162 : {
20163 :
20164 : /*
20165 : * User wrote "(column)" or "(column COLLATE something)".
20166 : * Treat it like simple attribute anyway.
20167 : */
20168 4 : partattrs[attn] = ((Var *) expr)->varattno;
20169 : }
20170 : else
20171 : {
20172 172 : partattrs[attn] = 0; /* marks the column as expression */
20173 172 : *partexprs = lappend(*partexprs, expr);
20174 :
20175 : /*
20176 : * transformPartitionSpec() should have already rejected
20177 : * subqueries, aggregates, window functions, and SRFs, based
20178 : * on the EXPR_KIND_ for partition expressions.
20179 : */
20180 :
20181 : /*
20182 : * Preprocess the expression before checking for mutability.
20183 : * This is essential for the reasons described in
20184 : * contain_mutable_functions_after_planning. However, we call
20185 : * expression_planner for ourselves rather than using that
20186 : * function, because if constant-folding reduces the
20187 : * expression to a constant, we'd like to know that so we can
20188 : * complain below.
20189 : *
20190 : * Like contain_mutable_functions_after_planning, assume that
20191 : * expression_planner won't scribble on its input, so this
20192 : * won't affect the partexprs entry we saved above.
20193 : */
20194 172 : expr = (Node *) expression_planner((Expr *) expr);
20195 :
20196 : /*
20197 : * Partition expressions cannot contain mutable functions,
20198 : * because a given row must always map to the same partition
20199 : * as long as there is no change in the partition boundary
20200 : * structure.
20201 : */
20202 172 : if (contain_mutable_functions(expr))
20203 4 : ereport(ERROR,
20204 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20205 : errmsg("functions in partition key expression must be marked IMMUTABLE")));
20206 :
20207 : /*
20208 : * While it is not exactly *wrong* for a partition expression
20209 : * to be a constant, it seems better to reject such keys.
20210 : */
20211 168 : if (IsA(expr, Const))
20212 8 : ereport(ERROR,
20213 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
20214 : errmsg("cannot use constant expression as partition key")));
20215 : }
20216 : }
20217 :
20218 : /*
20219 : * Apply collation override if any
20220 : */
20221 3764 : if (pelem->collation)
20222 36 : attcollation = get_collation_oid(pelem->collation, false);
20223 :
20224 : /*
20225 : * Check we have a collation iff it's a collatable type. The only
20226 : * expected failures here are (1) COLLATE applied to a noncollatable
20227 : * type, or (2) partition expression had an unresolved collation. But
20228 : * we might as well code this to be a complete consistency check.
20229 : */
20230 3764 : if (type_is_collatable(atttype))
20231 : {
20232 436 : if (!OidIsValid(attcollation))
20233 0 : ereport(ERROR,
20234 : (errcode(ERRCODE_INDETERMINATE_COLLATION),
20235 : errmsg("could not determine which collation to use for partition expression"),
20236 : errhint("Use the COLLATE clause to set the collation explicitly.")));
20237 : }
20238 : else
20239 : {
20240 3328 : if (OidIsValid(attcollation))
20241 0 : ereport(ERROR,
20242 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20243 : errmsg("collations are not supported by type %s",
20244 : format_type_be(atttype))));
20245 : }
20246 :
20247 3764 : partcollation[attn] = attcollation;
20248 :
20249 : /*
20250 : * Identify the appropriate operator class. For list and range
20251 : * partitioning, we use a btree operator class; hash partitioning uses
20252 : * a hash operator class.
20253 : */
20254 3764 : if (strategy == PARTITION_STRATEGY_HASH)
20255 215 : am_oid = HASH_AM_OID;
20256 : else
20257 3549 : am_oid = BTREE_AM_OID;
20258 :
20259 3764 : if (!pelem->opclass)
20260 : {
20261 3672 : partopclass[attn] = GetDefaultOpClass(atttype, am_oid);
20262 :
20263 3672 : if (!OidIsValid(partopclass[attn]))
20264 : {
20265 8 : if (strategy == PARTITION_STRATEGY_HASH)
20266 0 : ereport(ERROR,
20267 : (errcode(ERRCODE_UNDEFINED_OBJECT),
20268 : errmsg("data type %s has no default operator class for access method \"%s\"",
20269 : format_type_be(atttype), "hash"),
20270 : errhint("You must specify a hash operator class or define a default hash operator class for the data type.")));
20271 : else
20272 8 : ereport(ERROR,
20273 : (errcode(ERRCODE_UNDEFINED_OBJECT),
20274 : errmsg("data type %s has no default operator class for access method \"%s\"",
20275 : format_type_be(atttype), "btree"),
20276 : errhint("You must specify a btree operator class or define a default btree operator class for the data type.")));
20277 : }
20278 : }
20279 : else
20280 92 : partopclass[attn] = ResolveOpClass(pelem->opclass,
20281 : atttype,
20282 : am_oid == HASH_AM_OID ? "hash" : "btree",
20283 : am_oid);
20284 :
20285 3748 : attn++;
20286 : }
20287 3430 : }
20288 :
20289 : /*
20290 : * PartConstraintImpliedByRelConstraint
20291 : * Do scanrel's existing constraints imply the partition constraint?
20292 : *
20293 : * "Existing constraints" include its check constraints and column-level
20294 : * not-null constraints. partConstraint describes the partition constraint,
20295 : * in implicit-AND form.
20296 : */
20297 : bool
20298 2048 : PartConstraintImpliedByRelConstraint(Relation scanrel,
20299 : List *partConstraint)
20300 : {
20301 2048 : List *existConstraint = NIL;
20302 2048 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20303 : int i;
20304 :
20305 2048 : if (constr && constr->has_not_null)
20306 : {
20307 534 : int natts = scanrel->rd_att->natts;
20308 :
20309 1812 : for (i = 1; i <= natts; i++)
20310 : {
20311 1278 : CompactAttribute *att = TupleDescCompactAttr(scanrel->rd_att, i - 1);
20312 :
20313 : /* invalid not-null constraint must be ignored here */
20314 1278 : if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
20315 : {
20316 727 : Form_pg_attribute wholeatt = TupleDescAttr(scanrel->rd_att, i - 1);
20317 727 : NullTest *ntest = makeNode(NullTest);
20318 :
20319 727 : ntest->arg = (Expr *) makeVar(1,
20320 : i,
20321 : wholeatt->atttypid,
20322 : wholeatt->atttypmod,
20323 : wholeatt->attcollation,
20324 : 0);
20325 727 : ntest->nulltesttype = IS_NOT_NULL;
20326 :
20327 : /*
20328 : * argisrow=false is correct even for a composite column,
20329 : * because attnotnull does not represent a SQL-spec IS NOT
20330 : * NULL test in such a case, just IS DISTINCT FROM NULL.
20331 : */
20332 727 : ntest->argisrow = false;
20333 727 : ntest->location = -1;
20334 727 : existConstraint = lappend(existConstraint, ntest);
20335 : }
20336 : }
20337 : }
20338 :
20339 2048 : return ConstraintImpliedByRelConstraint(scanrel, partConstraint, existConstraint);
20340 : }
20341 :
20342 : /*
20343 : * ConstraintImpliedByRelConstraint
20344 : * Do scanrel's existing constraints imply the given constraint?
20345 : *
20346 : * testConstraint is the constraint to validate. provenConstraint is a
20347 : * caller-provided list of conditions which this function may assume
20348 : * to be true. Both provenConstraint and testConstraint must be in
20349 : * implicit-AND form, must only contain immutable clauses, and must
20350 : * contain only Vars with varno = 1.
20351 : */
20352 : bool
20353 2860 : ConstraintImpliedByRelConstraint(Relation scanrel, List *testConstraint, List *provenConstraint)
20354 : {
20355 2860 : List *existConstraint = list_copy(provenConstraint);
20356 2860 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20357 : int num_check,
20358 : i;
20359 :
20360 2860 : num_check = (constr != NULL) ? constr->num_check : 0;
20361 3196 : for (i = 0; i < num_check; i++)
20362 : {
20363 : Node *cexpr;
20364 :
20365 : /*
20366 : * If this constraint hasn't been fully validated yet, we must ignore
20367 : * it here.
20368 : */
20369 336 : if (!constr->check[i].ccvalid)
20370 12 : continue;
20371 :
20372 : /*
20373 : * NOT ENFORCED constraints are always marked as invalid, which should
20374 : * have been ignored.
20375 : */
20376 : Assert(constr->check[i].ccenforced);
20377 :
20378 324 : cexpr = stringToNode(constr->check[i].ccbin);
20379 :
20380 : /*
20381 : * Run each expression through const-simplification and
20382 : * canonicalization. It is necessary, because we will be comparing it
20383 : * to similarly-processed partition constraint expressions, and may
20384 : * fail to detect valid matches without this.
20385 : */
20386 324 : cexpr = eval_const_expressions(NULL, cexpr);
20387 324 : cexpr = (Node *) canonicalize_qual((Expr *) cexpr, true);
20388 :
20389 324 : existConstraint = list_concat(existConstraint,
20390 324 : make_ands_implicit((Expr *) cexpr));
20391 : }
20392 :
20393 : /*
20394 : * Try to make the proof. Since we are comparing CHECK constraints, we
20395 : * need to use weak implication, i.e., we assume existConstraint is
20396 : * not-false and try to prove the same for testConstraint.
20397 : *
20398 : * Note that predicate_implied_by assumes its first argument is known
20399 : * immutable. That should always be true for both NOT NULL and partition
20400 : * constraints, so we don't test it here.
20401 : */
20402 2860 : return predicate_implied_by(testConstraint, existConstraint, true);
20403 : }
20404 :
20405 : /*
20406 : * QueuePartitionConstraintValidation
20407 : *
20408 : * Add an entry to wqueue to have the given partition constraint validated by
20409 : * Phase 3, for the given relation, and all its children.
20410 : *
20411 : * We first verify whether the given constraint is implied by pre-existing
20412 : * relation constraints; if it is, there's no need to scan the table to
20413 : * validate, so don't queue in that case.
20414 : */
20415 : static void
20416 1723 : QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
20417 : List *partConstraint,
20418 : bool validate_default)
20419 : {
20420 : /*
20421 : * Based on the table's existing constraints, determine whether or not we
20422 : * may skip scanning the table.
20423 : */
20424 1723 : if (PartConstraintImpliedByRelConstraint(scanrel, partConstraint))
20425 : {
20426 55 : if (!validate_default)
20427 41 : ereport(DEBUG1,
20428 : (errmsg_internal("partition constraint for table \"%s\" is implied by existing constraints",
20429 : RelationGetRelationName(scanrel))));
20430 : else
20431 14 : ereport(DEBUG1,
20432 : (errmsg_internal("updated partition constraint for default partition \"%s\" is implied by existing constraints",
20433 : RelationGetRelationName(scanrel))));
20434 55 : return;
20435 : }
20436 :
20437 : /*
20438 : * Constraints proved insufficient. For plain relations, queue a
20439 : * validation item now; for partitioned tables, recurse to process each
20440 : * partition.
20441 : */
20442 1668 : if (scanrel->rd_rel->relkind == RELKIND_RELATION)
20443 : {
20444 : AlteredTableInfo *tab;
20445 :
20446 : /* Grab a work queue entry. */
20447 1393 : tab = ATGetQueueEntry(wqueue, scanrel);
20448 : Assert(tab->partition_constraint == NULL);
20449 1393 : tab->partition_constraint = (Expr *) linitial(partConstraint);
20450 1393 : tab->validate_default = validate_default;
20451 : }
20452 275 : else if (scanrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20453 : {
20454 244 : PartitionDesc partdesc = RelationGetPartitionDesc(scanrel, true);
20455 : int i;
20456 :
20457 524 : for (i = 0; i < partdesc->nparts; i++)
20458 : {
20459 : Relation part_rel;
20460 : List *thisPartConstraint;
20461 :
20462 : /*
20463 : * This is the minimum lock we need to prevent deadlocks.
20464 : */
20465 280 : part_rel = table_open(partdesc->oids[i], AccessExclusiveLock);
20466 :
20467 : /*
20468 : * Adjust the constraint for scanrel so that it matches this
20469 : * partition's attribute numbers.
20470 : */
20471 : thisPartConstraint =
20472 280 : map_partition_varattnos(partConstraint, 1,
20473 : part_rel, scanrel);
20474 :
20475 280 : QueuePartitionConstraintValidation(wqueue, part_rel,
20476 : thisPartConstraint,
20477 : validate_default);
20478 280 : table_close(part_rel, NoLock); /* keep lock till commit */
20479 : }
20480 : }
20481 : }
20482 :
20483 : /*
20484 : * attachPartitionTable: attach a new partition to the partitioned table
20485 : *
20486 : * wqueue: the ALTER TABLE work queue; can be NULL when not running as part
20487 : * of an ALTER TABLE sequence.
20488 : * rel: partitioned relation;
20489 : * attachrel: relation of attached partition;
20490 : * bound: bounds of attached relation.
20491 : */
20492 : static void
20493 1906 : attachPartitionTable(List **wqueue, Relation rel, Relation attachrel, PartitionBoundSpec *bound)
20494 : {
20495 : /*
20496 : * Create an inheritance; the relevant checks are performed inside the
20497 : * function.
20498 : */
20499 1906 : CreateInheritance(attachrel, rel, true);
20500 :
20501 : /* Update the pg_class entry. */
20502 1834 : StorePartitionBound(attachrel, rel, bound);
20503 :
20504 : /* Ensure there exists a correct set of indexes in the partition. */
20505 1834 : AttachPartitionEnsureIndexes(wqueue, rel, attachrel);
20506 :
20507 : /* and triggers */
20508 1814 : CloneRowTriggersToPartition(rel, attachrel);
20509 :
20510 : /*
20511 : * Clone foreign key constraints. Callee is responsible for setting up
20512 : * for phase 3 constraint verification.
20513 : */
20514 1810 : CloneForeignKeyConstraints(wqueue, rel, attachrel);
20515 1798 : }
20516 :
20517 : /*
20518 : * ALTER TABLE <name> ATTACH PARTITION <partition-name> FOR VALUES
20519 : *
20520 : * Return the address of the newly attached partition.
20521 : */
20522 : static ObjectAddress
20523 1594 : ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd,
20524 : AlterTableUtilityContext *context)
20525 : {
20526 : Relation attachrel,
20527 : catalog;
20528 : List *attachrel_children;
20529 : List *partConstraint;
20530 : SysScanDesc scan;
20531 : ScanKeyData skey;
20532 : AttrNumber attno;
20533 : int natts;
20534 : TupleDesc tupleDesc;
20535 : ObjectAddress address;
20536 : const char *trigger_name;
20537 : Oid defaultPartOid;
20538 : List *partBoundConstraint;
20539 1594 : List *exceptpuboids = NIL;
20540 1594 : ParseState *pstate = make_parsestate(NULL);
20541 :
20542 1594 : pstate->p_sourcetext = context->queryString;
20543 :
20544 : /*
20545 : * We must lock the default partition if one exists, because attaching a
20546 : * new partition will change its partition constraint.
20547 : */
20548 : defaultPartOid =
20549 1594 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20550 1594 : if (OidIsValid(defaultPartOid))
20551 117 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20552 :
20553 1594 : attachrel = table_openrv(cmd->name, AccessExclusiveLock);
20554 :
20555 : /*
20556 : * XXX I think it'd be a good idea to grab locks on all tables referenced
20557 : * by FKs at this point also.
20558 : */
20559 :
20560 : /*
20561 : * Must be owner of both parent and source table -- parent was checked by
20562 : * ATSimplePermissions call in ATPrepCmd
20563 : */
20564 1590 : ATSimplePermissions(AT_AttachPartition, attachrel,
20565 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
20566 :
20567 : /* A partition can only have one parent */
20568 1586 : if (attachrel->rd_rel->relispartition)
20569 4 : ereport(ERROR,
20570 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20571 : errmsg("\"%s\" is already a partition",
20572 : RelationGetRelationName(attachrel))));
20573 :
20574 1582 : if (OidIsValid(attachrel->rd_rel->reloftype))
20575 4 : ereport(ERROR,
20576 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20577 : errmsg("cannot attach a typed table as partition")));
20578 :
20579 : /*
20580 : * Disallow attaching a partition if the table is referenced in a
20581 : * publication EXCEPT clause. Changing the partition hierarchy could alter
20582 : * the effective publication membership.
20583 : */
20584 1578 : exceptpuboids = GetRelationExcludedPublications(RelationGetRelid(attachrel));
20585 1578 : if (exceptpuboids != NIL)
20586 : {
20587 4 : bool first = true;
20588 : StringInfoData pubnames;
20589 :
20590 4 : initStringInfo(&pubnames);
20591 :
20592 12 : foreach_oid(pubid, exceptpuboids)
20593 : {
20594 4 : char *pubname = get_publication_name(pubid, false);
20595 :
20596 4 : if (!first)
20597 : {
20598 : /*
20599 : * translator: This is a separator in a list of publication
20600 : * names.
20601 : */
20602 0 : appendStringInfoString(&pubnames, _(", "));
20603 : }
20604 :
20605 4 : first = false;
20606 :
20607 4 : appendStringInfo(&pubnames, _("\"%s\""), pubname);
20608 : }
20609 :
20610 4 : ereport(ERROR,
20611 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20612 : errmsg_plural("cannot attach table \"%s\" as partition because it is referenced in publication %s EXCEPT clause",
20613 : "cannot attach table \"%s\" as partition because it is referenced in publications %s EXCEPT clause",
20614 : list_length(exceptpuboids),
20615 : RelationGetRelationName(attachrel),
20616 : pubnames.data),
20617 : errdetail("The publication EXCEPT clause cannot contain tables that are partitions."),
20618 : errhint("Change the publication's EXCEPT clause using ALTER PUBLICATION ... SET ALL TABLES."));
20619 : }
20620 :
20621 1574 : list_free(exceptpuboids);
20622 :
20623 : /*
20624 : * Table being attached should not already be part of inheritance; either
20625 : * as a child table...
20626 : */
20627 1574 : catalog = table_open(InheritsRelationId, AccessShareLock);
20628 1574 : ScanKeyInit(&skey,
20629 : Anum_pg_inherits_inhrelid,
20630 : BTEqualStrategyNumber, F_OIDEQ,
20631 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20632 1574 : scan = systable_beginscan(catalog, InheritsRelidSeqnoIndexId, true,
20633 : NULL, 1, &skey);
20634 1574 : if (HeapTupleIsValid(systable_getnext(scan)))
20635 4 : ereport(ERROR,
20636 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20637 : errmsg("cannot attach inheritance child as partition")));
20638 1570 : systable_endscan(scan);
20639 :
20640 : /* ...or as a parent table (except the case when it is partitioned) */
20641 1570 : ScanKeyInit(&skey,
20642 : Anum_pg_inherits_inhparent,
20643 : BTEqualStrategyNumber, F_OIDEQ,
20644 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20645 1570 : scan = systable_beginscan(catalog, InheritsParentIndexId, true, NULL,
20646 : 1, &skey);
20647 1570 : if (HeapTupleIsValid(systable_getnext(scan)) &&
20648 184 : attachrel->rd_rel->relkind == RELKIND_RELATION)
20649 4 : ereport(ERROR,
20650 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20651 : errmsg("cannot attach inheritance parent as partition")));
20652 1566 : systable_endscan(scan);
20653 1566 : table_close(catalog, AccessShareLock);
20654 :
20655 : /*
20656 : * Prevent circularity by seeing if rel is a partition of attachrel. (In
20657 : * particular, this disallows making a rel a partition of itself.)
20658 : *
20659 : * We do that by checking if rel is a member of the list of attachrel's
20660 : * partitions provided the latter is partitioned at all. We want to avoid
20661 : * having to construct this list again, so we request the strongest lock
20662 : * on all partitions. We need the strongest lock, because we may decide
20663 : * to scan them if we find out that the table being attached (or its leaf
20664 : * partitions) may contain rows that violate the partition constraint. If
20665 : * the table has a constraint that would prevent such rows, which by
20666 : * definition is present in all the partitions, we need not scan the
20667 : * table, nor its partitions. But we cannot risk a deadlock by taking a
20668 : * weaker lock now and the stronger one only when needed.
20669 : */
20670 1566 : attachrel_children = find_all_inheritors(RelationGetRelid(attachrel),
20671 : AccessExclusiveLock, NULL);
20672 1566 : if (list_member_oid(attachrel_children, RelationGetRelid(rel)))
20673 8 : ereport(ERROR,
20674 : (errcode(ERRCODE_DUPLICATE_TABLE),
20675 : errmsg("circular inheritance not allowed"),
20676 : errdetail("\"%s\" is already a child of \"%s\".",
20677 : RelationGetRelationName(rel),
20678 : RelationGetRelationName(attachrel))));
20679 :
20680 : /* If the parent is permanent, so must be all of its partitions. */
20681 1558 : if (rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
20682 1530 : attachrel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
20683 4 : ereport(ERROR,
20684 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20685 : errmsg("cannot attach a temporary relation as partition of permanent relation \"%s\"",
20686 : RelationGetRelationName(rel))));
20687 :
20688 : /* Temp parent cannot have a partition that is itself not a temp */
20689 1554 : if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20690 28 : attachrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
20691 12 : ereport(ERROR,
20692 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20693 : errmsg("cannot attach a permanent relation as partition of temporary relation \"%s\"",
20694 : RelationGetRelationName(rel))));
20695 :
20696 : /* If the parent is temp, it must belong to this session */
20697 1542 : if (RELATION_IS_OTHER_TEMP(rel))
20698 0 : ereport(ERROR,
20699 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20700 : errmsg("cannot attach as partition of temporary relation of another session")));
20701 :
20702 : /* Ditto for the partition */
20703 1542 : if (RELATION_IS_OTHER_TEMP(attachrel))
20704 0 : ereport(ERROR,
20705 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20706 : errmsg("cannot attach temporary relation of another session as partition")));
20707 :
20708 : /*
20709 : * Check if attachrel has any identity columns or any columns that aren't
20710 : * in the parent.
20711 : */
20712 1542 : tupleDesc = RelationGetDescr(attachrel);
20713 1542 : natts = tupleDesc->natts;
20714 5304 : for (attno = 1; attno <= natts; attno++)
20715 : {
20716 3790 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc, attno - 1);
20717 3790 : char *attributeName = NameStr(attribute->attname);
20718 :
20719 : /* Ignore dropped */
20720 3790 : if (attribute->attisdropped)
20721 388 : continue;
20722 :
20723 3402 : if (attribute->attidentity)
20724 16 : ereport(ERROR,
20725 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20726 : errmsg("table \"%s\" being attached contains an identity column \"%s\"",
20727 : RelationGetRelationName(attachrel), attributeName),
20728 : errdetail("The new partition may not contain an identity column."));
20729 :
20730 : /* Try to find the column in parent (matching on column name) */
20731 3386 : if (!SearchSysCacheExists2(ATTNAME,
20732 : ObjectIdGetDatum(RelationGetRelid(rel)),
20733 : CStringGetDatum(attributeName)))
20734 12 : ereport(ERROR,
20735 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20736 : errmsg("table \"%s\" contains column \"%s\" not found in parent \"%s\"",
20737 : RelationGetRelationName(attachrel), attributeName,
20738 : RelationGetRelationName(rel)),
20739 : errdetail("The new partition may contain only the columns present in parent.")));
20740 : }
20741 :
20742 : /*
20743 : * If child_rel has row-level triggers with transition tables, we
20744 : * currently don't allow it to become a partition. See also prohibitions
20745 : * in ATExecAddInherit() and CreateTrigger().
20746 : */
20747 1514 : trigger_name = FindTriggerIncompatibleWithInheritance(attachrel->trigdesc);
20748 1514 : if (trigger_name != NULL)
20749 4 : ereport(ERROR,
20750 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
20751 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming a partition",
20752 : trigger_name, RelationGetRelationName(attachrel)),
20753 : errdetail("ROW triggers with transition tables are not supported on partitions.")));
20754 :
20755 : /*
20756 : * Check that the new partition's bound is valid and does not overlap any
20757 : * of existing partitions of the parent - note that it does not return on
20758 : * error.
20759 : */
20760 1510 : check_new_partition_bound(RelationGetRelationName(attachrel), rel,
20761 : cmd->bound, pstate);
20762 :
20763 1486 : attachPartitionTable(wqueue, rel, attachrel, cmd->bound);
20764 :
20765 : /*
20766 : * Generate a partition constraint from the partition bound specification.
20767 : * If the parent itself is a partition, make sure to include its
20768 : * constraint as well.
20769 : */
20770 1378 : partBoundConstraint = get_qual_from_partbound(rel, cmd->bound);
20771 :
20772 : /*
20773 : * Use list_concat_copy() to avoid modifying partBoundConstraint in place,
20774 : * since it's needed later to construct the constraint expression for
20775 : * validating against the default partition, if any.
20776 : */
20777 1378 : partConstraint = list_concat_copy(partBoundConstraint,
20778 1378 : RelationGetPartitionQual(rel));
20779 :
20780 : /* Skip validation if there are no constraints to validate. */
20781 1378 : if (partConstraint)
20782 : {
20783 : /*
20784 : * Run the partition quals through const-simplification similar to
20785 : * check constraints. We skip canonicalize_qual, though, because
20786 : * partition quals should be in canonical form already.
20787 : */
20788 : partConstraint =
20789 1350 : (List *) eval_const_expressions(NULL,
20790 : (Node *) partConstraint);
20791 :
20792 : /* XXX this sure looks wrong */
20793 1350 : partConstraint = list_make1(make_ands_explicit(partConstraint));
20794 :
20795 : /*
20796 : * Adjust the generated constraint to match this partition's attribute
20797 : * numbers.
20798 : */
20799 1350 : partConstraint = map_partition_varattnos(partConstraint, 1, attachrel,
20800 : rel);
20801 :
20802 : /* Validate partition constraints against the table being attached. */
20803 1350 : QueuePartitionConstraintValidation(wqueue, attachrel, partConstraint,
20804 : false);
20805 : }
20806 :
20807 : /*
20808 : * If we're attaching a partition other than the default partition and a
20809 : * default one exists, then that partition's partition constraint changes,
20810 : * so add an entry to the work queue to validate it, too. (We must not do
20811 : * this when the partition being attached is the default one; we already
20812 : * did it above!)
20813 : */
20814 1378 : if (OidIsValid(defaultPartOid))
20815 : {
20816 : Relation defaultrel;
20817 : List *defPartConstraint;
20818 :
20819 : Assert(!cmd->bound->is_default);
20820 :
20821 : /* we already hold a lock on the default partition */
20822 93 : defaultrel = table_open(defaultPartOid, NoLock);
20823 : defPartConstraint =
20824 93 : get_proposed_default_constraint(partBoundConstraint);
20825 :
20826 : /*
20827 : * Map the Vars in the constraint expression from rel's attnos to
20828 : * defaultrel's.
20829 : */
20830 : defPartConstraint =
20831 93 : map_partition_varattnos(defPartConstraint,
20832 : 1, defaultrel, rel);
20833 93 : QueuePartitionConstraintValidation(wqueue, defaultrel,
20834 : defPartConstraint, true);
20835 :
20836 : /* keep our lock until commit. */
20837 93 : table_close(defaultrel, NoLock);
20838 : }
20839 :
20840 1378 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(attachrel));
20841 :
20842 : /*
20843 : * If the partition we just attached is partitioned itself, invalidate
20844 : * relcache for all descendent partitions too to ensure that their
20845 : * rd_partcheck expression trees are rebuilt; partitions already locked at
20846 : * the beginning of this function.
20847 : */
20848 1378 : if (attachrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20849 : {
20850 : ListCell *l;
20851 :
20852 711 : foreach(l, attachrel_children)
20853 : {
20854 482 : CacheInvalidateRelcacheByRelid(lfirst_oid(l));
20855 : }
20856 : }
20857 :
20858 : /* keep our lock until commit */
20859 1378 : table_close(attachrel, NoLock);
20860 :
20861 1378 : return address;
20862 : }
20863 :
20864 : /*
20865 : * AttachPartitionEnsureIndexes
20866 : * subroutine for ATExecAttachPartition to create/match indexes
20867 : *
20868 : * Enforce the indexing rule for partitioned tables during ALTER TABLE / ATTACH
20869 : * PARTITION: every partition must have an index attached to each index on the
20870 : * partitioned table.
20871 : */
20872 : static void
20873 1834 : AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
20874 : {
20875 : List *idxes;
20876 : List *attachRelIdxs;
20877 : Relation *attachrelIdxRels;
20878 : IndexInfo **attachInfos;
20879 : ListCell *cell;
20880 : MemoryContext cxt;
20881 : MemoryContext oldcxt;
20882 :
20883 1834 : cxt = AllocSetContextCreate(CurrentMemoryContext,
20884 : "AttachPartitionEnsureIndexes",
20885 : ALLOCSET_DEFAULT_SIZES);
20886 1834 : oldcxt = MemoryContextSwitchTo(cxt);
20887 :
20888 1834 : idxes = RelationGetIndexList(rel);
20889 1834 : attachRelIdxs = RelationGetIndexList(attachrel);
20890 1834 : attachrelIdxRels = palloc_array(Relation, list_length(attachRelIdxs));
20891 1834 : attachInfos = palloc_array(IndexInfo *, list_length(attachRelIdxs));
20892 :
20893 : /* Build arrays of all existing indexes and their IndexInfos */
20894 3937 : foreach_oid(cldIdxId, attachRelIdxs)
20895 : {
20896 269 : int i = foreach_current_index(cldIdxId);
20897 :
20898 269 : attachrelIdxRels[i] = index_open(cldIdxId, AccessShareLock);
20899 269 : attachInfos[i] = BuildIndexInfo(attachrelIdxRels[i]);
20900 : }
20901 :
20902 : /*
20903 : * If we're attaching a foreign table, we must fail if any of the indexes
20904 : * is a constraint index; otherwise, there's nothing to do here. Do this
20905 : * before starting work, to avoid wasting the effort of building a few
20906 : * non-unique indexes before coming across a unique one.
20907 : */
20908 1834 : if (attachrel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
20909 : {
20910 55 : foreach(cell, idxes)
20911 : {
20912 24 : Oid idx = lfirst_oid(cell);
20913 24 : Relation idxRel = index_open(idx, AccessShareLock);
20914 :
20915 24 : if (idxRel->rd_index->indisunique ||
20916 16 : idxRel->rd_index->indisprimary)
20917 8 : ereport(ERROR,
20918 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20919 : errmsg("cannot attach foreign table \"%s\" as partition of partitioned table \"%s\"",
20920 : RelationGetRelationName(attachrel),
20921 : RelationGetRelationName(rel)),
20922 : errdetail("Partitioned table \"%s\" contains unique indexes.",
20923 : RelationGetRelationName(rel))));
20924 16 : index_close(idxRel, AccessShareLock);
20925 : }
20926 :
20927 31 : goto out;
20928 : }
20929 :
20930 : /*
20931 : * For each index on the partitioned table, find a matching one in the
20932 : * partition-to-be; if one is not found, create one.
20933 : */
20934 2260 : foreach(cell, idxes)
20935 : {
20936 477 : Oid idx = lfirst_oid(cell);
20937 477 : Relation idxRel = index_open(idx, AccessShareLock);
20938 : IndexInfo *info;
20939 : AttrMap *attmap;
20940 477 : bool found = false;
20941 : Oid constraintOid;
20942 :
20943 : /*
20944 : * Ignore indexes in the partitioned table other than partitioned
20945 : * indexes.
20946 : */
20947 477 : if (idxRel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
20948 : {
20949 0 : index_close(idxRel, AccessShareLock);
20950 0 : continue;
20951 : }
20952 :
20953 : /* construct an indexinfo to compare existing indexes against */
20954 477 : info = BuildIndexInfo(idxRel);
20955 477 : attmap = build_attrmap_by_name(RelationGetDescr(attachrel),
20956 : RelationGetDescr(rel),
20957 : false);
20958 477 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(rel), idx);
20959 :
20960 : /*
20961 : * Scan the list of existing indexes in the partition-to-be, and mark
20962 : * the first matching, valid, unattached one we find, if any, as
20963 : * partition of the parent index. If we find one, we're done.
20964 : */
20965 517 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20966 : {
20967 197 : Oid cldIdxId = RelationGetRelid(attachrelIdxRels[i]);
20968 197 : Oid cldConstrOid = InvalidOid;
20969 :
20970 : /* does this index have a parent? if so, can't use it */
20971 197 : if (attachrelIdxRels[i]->rd_rel->relispartition)
20972 8 : continue;
20973 :
20974 : /* If this index is invalid, can't use it */
20975 189 : if (!attachrelIdxRels[i]->rd_index->indisvalid)
20976 4 : continue;
20977 :
20978 185 : if (CompareIndexInfo(attachInfos[i], info,
20979 185 : attachrelIdxRels[i]->rd_indcollation,
20980 185 : idxRel->rd_indcollation,
20981 185 : attachrelIdxRels[i]->rd_opfamily,
20982 185 : idxRel->rd_opfamily,
20983 : attmap))
20984 : {
20985 : /*
20986 : * If this index is being created in the parent because of a
20987 : * constraint, then the child needs to have a constraint also,
20988 : * so look for one. If there is no such constraint, this
20989 : * index is no good, so keep looking.
20990 : */
20991 161 : if (OidIsValid(constraintOid))
20992 : {
20993 : cldConstrOid =
20994 96 : get_relation_idx_constraint_oid(RelationGetRelid(attachrel),
20995 : cldIdxId);
20996 : /* no dice */
20997 96 : if (!OidIsValid(cldConstrOid))
20998 4 : continue;
20999 :
21000 : /* Ensure they're both the same type of constraint */
21001 184 : if (get_constraint_type(constraintOid) !=
21002 92 : get_constraint_type(cldConstrOid))
21003 0 : continue;
21004 : }
21005 :
21006 : /* bingo. */
21007 157 : IndexSetParentIndex(attachrelIdxRels[i], idx);
21008 157 : if (OidIsValid(constraintOid))
21009 92 : ConstraintSetParentConstraint(cldConstrOid, constraintOid,
21010 : RelationGetRelid(attachrel));
21011 157 : found = true;
21012 :
21013 157 : CommandCounterIncrement();
21014 157 : break;
21015 : }
21016 : }
21017 :
21018 : /*
21019 : * If no suitable index was found in the partition-to-be, create one
21020 : * now. Note that if this is a PK, not-null constraints must already
21021 : * exist.
21022 : */
21023 477 : if (!found)
21024 : {
21025 : IndexStmt *stmt;
21026 : Oid conOid;
21027 :
21028 320 : stmt = generateClonedIndexStmt(NULL,
21029 : idxRel, attmap,
21030 : &conOid);
21031 320 : DefineIndex(NULL,
21032 : RelationGetRelid(attachrel), stmt, InvalidOid,
21033 : RelationGetRelid(idxRel),
21034 : conOid,
21035 : -1,
21036 : true, false, false, false, false);
21037 : }
21038 :
21039 465 : index_close(idxRel, AccessShareLock);
21040 : }
21041 :
21042 1814 : out:
21043 : /* Clean up. */
21044 2075 : for (int i = 0; i < list_length(attachRelIdxs); i++)
21045 261 : index_close(attachrelIdxRels[i], AccessShareLock);
21046 1814 : MemoryContextSwitchTo(oldcxt);
21047 1814 : MemoryContextDelete(cxt);
21048 1814 : }
21049 :
21050 : /*
21051 : * CloneRowTriggersToPartition
21052 : * subroutine for ATExecAttachPartition/DefineRelation to create row
21053 : * triggers on partitions
21054 : */
21055 : static void
21056 2130 : CloneRowTriggersToPartition(Relation parent, Relation partition)
21057 : {
21058 : Relation pg_trigger;
21059 : ScanKeyData key;
21060 : SysScanDesc scan;
21061 : HeapTuple tuple;
21062 : MemoryContext perTupCxt;
21063 :
21064 2130 : ScanKeyInit(&key, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21065 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parent)));
21066 2130 : pg_trigger = table_open(TriggerRelationId, RowExclusiveLock);
21067 2130 : scan = systable_beginscan(pg_trigger, TriggerRelidNameIndexId,
21068 : true, NULL, 1, &key);
21069 :
21070 2130 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
21071 : "clone trig", ALLOCSET_SMALL_SIZES);
21072 :
21073 3519 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
21074 : {
21075 1393 : Form_pg_trigger trigForm = (Form_pg_trigger) GETSTRUCT(tuple);
21076 : CreateTrigStmt *trigStmt;
21077 1393 : Node *qual = NULL;
21078 : Datum value;
21079 : bool isnull;
21080 1393 : List *cols = NIL;
21081 1393 : List *trigargs = NIL;
21082 : MemoryContext oldcxt;
21083 :
21084 : /*
21085 : * Ignore statement-level triggers; those are not cloned.
21086 : */
21087 1393 : if (!TRIGGER_FOR_ROW(trigForm->tgtype))
21088 1262 : continue;
21089 :
21090 : /*
21091 : * Don't clone internal triggers, because the constraint cloning code
21092 : * will.
21093 : */
21094 1365 : if (trigForm->tgisinternal)
21095 1234 : continue;
21096 :
21097 : /*
21098 : * Complain if we find an unexpected trigger type.
21099 : */
21100 131 : if (!TRIGGER_FOR_BEFORE(trigForm->tgtype) &&
21101 107 : !TRIGGER_FOR_AFTER(trigForm->tgtype))
21102 0 : elog(ERROR, "unexpected trigger \"%s\" found",
21103 : NameStr(trigForm->tgname));
21104 :
21105 : /* Use short-lived context for CREATE TRIGGER */
21106 131 : oldcxt = MemoryContextSwitchTo(perTupCxt);
21107 :
21108 : /*
21109 : * If there is a WHEN clause, generate a 'cooked' version of it that's
21110 : * appropriate for the partition.
21111 : */
21112 131 : value = heap_getattr(tuple, Anum_pg_trigger_tgqual,
21113 : RelationGetDescr(pg_trigger), &isnull);
21114 131 : if (!isnull)
21115 : {
21116 4 : qual = stringToNode(TextDatumGetCString(value));
21117 4 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
21118 : partition, parent);
21119 4 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
21120 : partition, parent);
21121 : }
21122 :
21123 : /*
21124 : * If there is a column list, transform it to a list of column names.
21125 : * Note we don't need to map this list in any way ...
21126 : */
21127 131 : if (trigForm->tgattr.dim1 > 0)
21128 : {
21129 : int i;
21130 :
21131 8 : for (i = 0; i < trigForm->tgattr.dim1; i++)
21132 : {
21133 : Form_pg_attribute col;
21134 :
21135 4 : col = TupleDescAttr(parent->rd_att,
21136 4 : trigForm->tgattr.values[i] - 1);
21137 4 : cols = lappend(cols,
21138 4 : makeString(pstrdup(NameStr(col->attname))));
21139 : }
21140 : }
21141 :
21142 : /* Reconstruct trigger arguments list. */
21143 131 : if (trigForm->tgnargs > 0)
21144 : {
21145 : char *p;
21146 :
21147 36 : value = heap_getattr(tuple, Anum_pg_trigger_tgargs,
21148 : RelationGetDescr(pg_trigger), &isnull);
21149 36 : if (isnull)
21150 0 : elog(ERROR, "tgargs is null for trigger \"%s\" in partition \"%s\"",
21151 : NameStr(trigForm->tgname), RelationGetRelationName(partition));
21152 :
21153 36 : p = (char *) VARDATA_ANY(DatumGetByteaPP(value));
21154 :
21155 80 : for (int i = 0; i < trigForm->tgnargs; i++)
21156 : {
21157 44 : trigargs = lappend(trigargs, makeString(pstrdup(p)));
21158 44 : p += strlen(p) + 1;
21159 : }
21160 : }
21161 :
21162 131 : trigStmt = makeNode(CreateTrigStmt);
21163 131 : trigStmt->replace = false;
21164 131 : trigStmt->isconstraint = OidIsValid(trigForm->tgconstraint);
21165 131 : trigStmt->trigname = NameStr(trigForm->tgname);
21166 131 : trigStmt->relation = NULL;
21167 131 : trigStmt->funcname = NULL; /* passed separately */
21168 131 : trigStmt->args = trigargs;
21169 131 : trigStmt->row = true;
21170 131 : trigStmt->timing = trigForm->tgtype & TRIGGER_TYPE_TIMING_MASK;
21171 131 : trigStmt->events = trigForm->tgtype & TRIGGER_TYPE_EVENT_MASK;
21172 131 : trigStmt->columns = cols;
21173 131 : trigStmt->whenClause = NULL; /* passed separately */
21174 131 : trigStmt->transitionRels = NIL; /* not supported at present */
21175 131 : trigStmt->deferrable = trigForm->tgdeferrable;
21176 131 : trigStmt->initdeferred = trigForm->tginitdeferred;
21177 131 : trigStmt->constrrel = NULL; /* passed separately */
21178 :
21179 131 : CreateTriggerFiringOn(trigStmt, NULL, RelationGetRelid(partition),
21180 : trigForm->tgconstrrelid, InvalidOid, InvalidOid,
21181 : trigForm->tgfoid, trigForm->oid, qual,
21182 131 : false, true, trigForm->tgenabled);
21183 :
21184 127 : MemoryContextSwitchTo(oldcxt);
21185 127 : MemoryContextReset(perTupCxt);
21186 : }
21187 :
21188 2126 : MemoryContextDelete(perTupCxt);
21189 :
21190 2126 : systable_endscan(scan);
21191 2126 : table_close(pg_trigger, RowExclusiveLock);
21192 2126 : }
21193 :
21194 : /*
21195 : * ALTER TABLE DETACH PARTITION
21196 : *
21197 : * Return the address of the relation that is no longer a partition of rel.
21198 : *
21199 : * If concurrent mode is requested, we run in two transactions. A side-
21200 : * effect is that this command cannot run in a multi-part ALTER TABLE.
21201 : * Currently, that's enforced by the grammar.
21202 : *
21203 : * The strategy for concurrency is to first modify the partition's
21204 : * pg_inherit catalog row to make it visible to everyone that the
21205 : * partition is detached, lock the partition against writes, and commit
21206 : * the transaction; anyone who requests the partition descriptor from
21207 : * that point onwards has to ignore such a partition. In a second
21208 : * transaction, we wait until all transactions that could have seen the
21209 : * partition as attached are gone, then we remove the rest of partition
21210 : * metadata (pg_inherits and pg_class.relpartbounds).
21211 : */
21212 : static ObjectAddress
21213 365 : ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
21214 : RangeVar *name, bool concurrent)
21215 : {
21216 : Relation partRel;
21217 : ObjectAddress address;
21218 : Oid defaultPartOid;
21219 :
21220 : /*
21221 : * We must lock the default partition, because detaching this partition
21222 : * will change its partition constraint.
21223 : */
21224 : defaultPartOid =
21225 365 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
21226 365 : if (OidIsValid(defaultPartOid))
21227 : {
21228 : /*
21229 : * Concurrent detaching when a default partition exists is not
21230 : * supported. The main problem is that the default partition
21231 : * constraint would change. And there's a definitional problem: what
21232 : * should happen to the tuples that are being inserted that belong to
21233 : * the partition being detached? Putting them on the partition being
21234 : * detached would be wrong, since they'd become "lost" after the
21235 : * detaching completes but we cannot put them in the default partition
21236 : * either until we alter its partition constraint.
21237 : *
21238 : * I think we could solve this problem if we effected the constraint
21239 : * change before committing the first transaction. But the lock would
21240 : * have to remain AEL and it would cause concurrent query planning to
21241 : * be blocked, so changing it that way would be even worse.
21242 : */
21243 74 : if (concurrent)
21244 8 : ereport(ERROR,
21245 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21246 : errmsg("cannot detach partitions concurrently when a default partition exists")));
21247 66 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
21248 : }
21249 :
21250 : /*
21251 : * In concurrent mode, the partition is locked with share-update-exclusive
21252 : * in the first transaction. This allows concurrent transactions to be
21253 : * doing DML to the partition.
21254 : */
21255 357 : partRel = table_openrv(name, concurrent ? ShareUpdateExclusiveLock :
21256 : AccessExclusiveLock);
21257 :
21258 : /*
21259 : * Check inheritance conditions and either delete the pg_inherits row (in
21260 : * non-concurrent mode) or just set the inhdetachpending flag.
21261 : */
21262 349 : if (!concurrent)
21263 274 : RemoveInheritance(partRel, rel, false);
21264 : else
21265 75 : MarkInheritDetached(partRel, rel);
21266 :
21267 : /*
21268 : * Ensure that foreign keys still hold after this detach. This keeps
21269 : * locks on the referencing tables, which prevents concurrent transactions
21270 : * from adding rows that we wouldn't see. For this to work in concurrent
21271 : * mode, it is critical that the partition appears as no longer attached
21272 : * for the RI queries as soon as the first transaction commits.
21273 : */
21274 336 : ATDetachCheckNoForeignKeyRefs(partRel);
21275 :
21276 : /*
21277 : * Concurrent mode has to work harder; first we add a new constraint to
21278 : * the partition that matches the partition constraint. Then we close our
21279 : * existing transaction, and in a new one wait for all processes to catch
21280 : * up on the catalog updates we've done so far; at that point we can
21281 : * complete the operation.
21282 : */
21283 314 : if (concurrent)
21284 : {
21285 : Oid partrelid,
21286 : parentrelid;
21287 : LOCKTAG tag;
21288 : char *parentrelname;
21289 : char *partrelname;
21290 :
21291 : /*
21292 : * We're almost done now; the only traces that remain are the
21293 : * pg_inherits tuple and the partition's relpartbounds. Before we can
21294 : * remove those, we need to wait until all transactions that know that
21295 : * this is a partition are gone.
21296 : */
21297 :
21298 : /*
21299 : * Remember relation OIDs to re-acquire them later; and relation names
21300 : * too, for error messages if something is dropped in between.
21301 : */
21302 72 : partrelid = RelationGetRelid(partRel);
21303 72 : parentrelid = RelationGetRelid(rel);
21304 72 : parentrelname = MemoryContextStrdup(PortalContext,
21305 72 : RelationGetRelationName(rel));
21306 72 : partrelname = MemoryContextStrdup(PortalContext,
21307 72 : RelationGetRelationName(partRel));
21308 :
21309 : /* Invalidate relcache entries for the parent -- must be before close */
21310 72 : CacheInvalidateRelcache(rel);
21311 :
21312 72 : table_close(partRel, NoLock);
21313 72 : table_close(rel, NoLock);
21314 72 : tab->rel = NULL;
21315 :
21316 : /* Make updated catalog entry visible */
21317 72 : PopActiveSnapshot();
21318 72 : CommitTransactionCommand();
21319 :
21320 72 : StartTransactionCommand();
21321 :
21322 : /*
21323 : * Now wait. This ensures that all queries that were planned
21324 : * including the partition are finished before we remove the rest of
21325 : * catalog entries. We don't need or indeed want to acquire this
21326 : * lock, though -- that would block later queries.
21327 : *
21328 : * We don't need to concern ourselves with waiting for a lock on the
21329 : * partition itself, since we will acquire AccessExclusiveLock below.
21330 : */
21331 72 : SET_LOCKTAG_RELATION(tag, MyDatabaseId, parentrelid);
21332 72 : WaitForLockersMultiple(list_make1(&tag), AccessExclusiveLock, false);
21333 :
21334 : /*
21335 : * Now acquire locks in both relations again. Note they may have been
21336 : * removed in the meantime, so care is required.
21337 : */
21338 47 : rel = try_relation_open(parentrelid, ShareUpdateExclusiveLock);
21339 47 : partRel = try_relation_open(partrelid, AccessExclusiveLock);
21340 :
21341 : /* If the relations aren't there, something bad happened; bail out */
21342 47 : if (rel == NULL)
21343 : {
21344 0 : if (partRel != NULL) /* shouldn't happen */
21345 0 : elog(WARNING, "dangling partition \"%s\" remains, can't fix",
21346 : partrelname);
21347 0 : ereport(ERROR,
21348 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21349 : errmsg("partitioned table \"%s\" was removed concurrently",
21350 : parentrelname)));
21351 : }
21352 47 : if (partRel == NULL)
21353 0 : ereport(ERROR,
21354 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21355 : errmsg("partition \"%s\" was removed concurrently", partrelname)));
21356 :
21357 47 : tab->rel = rel;
21358 : }
21359 :
21360 : /*
21361 : * Detaching the partition might involve TOAST table access, so ensure we
21362 : * have a valid snapshot.
21363 : */
21364 289 : PushActiveSnapshot(GetTransactionSnapshot());
21365 :
21366 : /* Do the final part of detaching */
21367 289 : DetachPartitionFinalize(rel, partRel, concurrent, defaultPartOid);
21368 :
21369 288 : PopActiveSnapshot();
21370 :
21371 288 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21372 :
21373 : /* keep our lock until commit */
21374 288 : table_close(partRel, NoLock);
21375 :
21376 288 : return address;
21377 : }
21378 :
21379 : /*
21380 : * Second part of ALTER TABLE .. DETACH.
21381 : *
21382 : * This is separate so that it can be run independently when the second
21383 : * transaction of the concurrent algorithm fails (crash or abort).
21384 : */
21385 : static void
21386 664 : DetachPartitionFinalize(Relation rel, Relation partRel, bool concurrent,
21387 : Oid defaultPartOid)
21388 : {
21389 : Relation classRel;
21390 : List *fks;
21391 : ListCell *cell;
21392 : List *indexes;
21393 : Datum new_val[Natts_pg_class];
21394 : bool new_null[Natts_pg_class],
21395 : new_repl[Natts_pg_class];
21396 : HeapTuple tuple,
21397 : newtuple;
21398 664 : Relation trigrel = NULL;
21399 664 : List *fkoids = NIL;
21400 :
21401 664 : if (concurrent)
21402 : {
21403 : /*
21404 : * We can remove the pg_inherits row now. (In the non-concurrent case,
21405 : * this was already done).
21406 : */
21407 54 : RemoveInheritance(partRel, rel, true);
21408 : }
21409 :
21410 : /* Drop any triggers that were cloned on creation/attach. */
21411 664 : DropClonedTriggersFromPartition(RelationGetRelid(partRel));
21412 :
21413 : /*
21414 : * Detach any foreign keys that are inherited. This includes creating
21415 : * additional action triggers.
21416 : */
21417 664 : fks = copyObject(RelationGetFKeyList(partRel));
21418 664 : if (fks != NIL)
21419 60 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
21420 :
21421 : /*
21422 : * It's possible that the partition being detached has a foreign key that
21423 : * references a partitioned table. When that happens, there are multiple
21424 : * pg_constraint rows for the partition: one points to the partitioned
21425 : * table itself, while the others point to each of its partitions. Only
21426 : * the topmost one is to be considered here; the child constraints must be
21427 : * left alone, because conceptually those aren't coming from our parent
21428 : * partitioned table, but from this partition itself.
21429 : *
21430 : * We implement this by collecting all the constraint OIDs in a first scan
21431 : * of the FK array, and skipping in the loop below those constraints whose
21432 : * parents are listed here.
21433 : */
21434 1444 : foreach_node(ForeignKeyCacheInfo, fk, fks)
21435 116 : fkoids = lappend_oid(fkoids, fk->conoid);
21436 :
21437 780 : foreach(cell, fks)
21438 : {
21439 116 : ForeignKeyCacheInfo *fk = lfirst(cell);
21440 : HeapTuple contup;
21441 : Form_pg_constraint conform;
21442 :
21443 116 : contup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
21444 116 : if (!HeapTupleIsValid(contup))
21445 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
21446 116 : conform = (Form_pg_constraint) GETSTRUCT(contup);
21447 :
21448 : /*
21449 : * Consider only inherited foreign keys, and only if their parents
21450 : * aren't in the list.
21451 : */
21452 116 : if (conform->contype != CONSTRAINT_FOREIGN ||
21453 216 : !OidIsValid(conform->conparentid) ||
21454 100 : list_member_oid(fkoids, conform->conparentid))
21455 : {
21456 44 : ReleaseSysCache(contup);
21457 44 : continue;
21458 : }
21459 :
21460 : /*
21461 : * The constraint on this table must be marked no longer a child of
21462 : * the parent's constraint, as do its check triggers.
21463 : */
21464 72 : ConstraintSetParentConstraint(fk->conoid, InvalidOid, InvalidOid);
21465 :
21466 : /*
21467 : * Also, look up the partition's "check" triggers corresponding to the
21468 : * ENFORCED constraint being detached and detach them from the parent
21469 : * triggers. NOT ENFORCED constraints do not have these triggers;
21470 : * therefore, this step is not needed.
21471 : */
21472 72 : if (fk->conenforced)
21473 : {
21474 : Oid insertTriggerOid,
21475 : updateTriggerOid;
21476 :
21477 72 : GetForeignKeyCheckTriggers(trigrel,
21478 : fk->conoid, fk->confrelid, fk->conrelid,
21479 : &insertTriggerOid, &updateTriggerOid);
21480 : Assert(OidIsValid(insertTriggerOid));
21481 72 : TriggerSetParentTrigger(trigrel, insertTriggerOid, InvalidOid,
21482 : RelationGetRelid(partRel));
21483 : Assert(OidIsValid(updateTriggerOid));
21484 72 : TriggerSetParentTrigger(trigrel, updateTriggerOid, InvalidOid,
21485 : RelationGetRelid(partRel));
21486 : }
21487 :
21488 : /*
21489 : * Lastly, create the action triggers on the referenced table, using
21490 : * addFkRecurseReferenced, which requires some elaborate setup (so put
21491 : * it in a separate block). While at it, if the table is partitioned,
21492 : * that function will recurse to create the pg_constraint rows and
21493 : * action triggers for each partition.
21494 : *
21495 : * Note there's no need to do addFkConstraint() here, because the
21496 : * pg_constraint row already exists.
21497 : */
21498 : {
21499 : Constraint *fkconstraint;
21500 : int numfks;
21501 : AttrNumber conkey[INDEX_MAX_KEYS];
21502 : AttrNumber confkey[INDEX_MAX_KEYS];
21503 : Oid conpfeqop[INDEX_MAX_KEYS];
21504 : Oid conppeqop[INDEX_MAX_KEYS];
21505 : Oid conffeqop[INDEX_MAX_KEYS];
21506 : int numfkdelsetcols;
21507 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
21508 : Relation refdRel;
21509 :
21510 72 : DeconstructFkConstraintRow(contup,
21511 : &numfks,
21512 : conkey,
21513 : confkey,
21514 : conpfeqop,
21515 : conppeqop,
21516 : conffeqop,
21517 : &numfkdelsetcols,
21518 : confdelsetcols);
21519 :
21520 : /* Create a synthetic node we'll use throughout */
21521 72 : fkconstraint = makeNode(Constraint);
21522 72 : fkconstraint->contype = CONSTRAINT_FOREIGN;
21523 72 : fkconstraint->conname = pstrdup(NameStr(conform->conname));
21524 72 : fkconstraint->deferrable = conform->condeferrable;
21525 72 : fkconstraint->initdeferred = conform->condeferred;
21526 72 : fkconstraint->is_enforced = conform->conenforced;
21527 72 : fkconstraint->skip_validation = true;
21528 72 : fkconstraint->initially_valid = conform->convalidated;
21529 : /* a few irrelevant fields omitted here */
21530 72 : fkconstraint->pktable = NULL;
21531 72 : fkconstraint->fk_attrs = NIL;
21532 72 : fkconstraint->pk_attrs = NIL;
21533 72 : fkconstraint->fk_matchtype = conform->confmatchtype;
21534 72 : fkconstraint->fk_upd_action = conform->confupdtype;
21535 72 : fkconstraint->fk_del_action = conform->confdeltype;
21536 72 : fkconstraint->fk_del_set_cols = NIL;
21537 72 : fkconstraint->old_conpfeqop = NIL;
21538 72 : fkconstraint->old_pktable_oid = InvalidOid;
21539 72 : fkconstraint->location = -1;
21540 :
21541 : /* set up colnames, used to generate the constraint name */
21542 176 : for (int i = 0; i < numfks; i++)
21543 : {
21544 : Form_pg_attribute att;
21545 :
21546 104 : att = TupleDescAttr(RelationGetDescr(partRel),
21547 104 : conkey[i] - 1);
21548 :
21549 104 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
21550 104 : makeString(NameStr(att->attname)));
21551 : }
21552 :
21553 72 : refdRel = table_open(fk->confrelid, ShareRowExclusiveLock);
21554 :
21555 72 : addFkRecurseReferenced(fkconstraint, partRel,
21556 : refdRel,
21557 : conform->conindid,
21558 : fk->conoid,
21559 : numfks,
21560 : confkey,
21561 : conkey,
21562 : conpfeqop,
21563 : conppeqop,
21564 : conffeqop,
21565 : numfkdelsetcols,
21566 : confdelsetcols,
21567 : true,
21568 : InvalidOid, InvalidOid,
21569 72 : conform->conperiod);
21570 72 : table_close(refdRel, NoLock); /* keep lock till end of xact */
21571 : }
21572 :
21573 72 : ReleaseSysCache(contup);
21574 : }
21575 664 : list_free_deep(fks);
21576 664 : if (trigrel)
21577 60 : table_close(trigrel, RowExclusiveLock);
21578 :
21579 : /*
21580 : * Any sub-constraints that are in the referenced-side of a larger
21581 : * constraint have to be removed. This partition is no longer part of the
21582 : * key space of the constraint.
21583 : */
21584 719 : foreach(cell, GetParentedForeignKeyRefs(partRel))
21585 : {
21586 56 : Oid constrOid = lfirst_oid(cell);
21587 : ObjectAddress constraint;
21588 :
21589 56 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21590 56 : deleteDependencyRecordsForClass(ConstraintRelationId,
21591 : constrOid,
21592 : ConstraintRelationId,
21593 : DEPENDENCY_INTERNAL);
21594 56 : CommandCounterIncrement();
21595 :
21596 56 : ObjectAddressSet(constraint, ConstraintRelationId, constrOid);
21597 56 : performDeletion(&constraint, DROP_RESTRICT, 0);
21598 : }
21599 :
21600 : /* Now we can detach indexes */
21601 663 : indexes = RelationGetIndexList(partRel);
21602 951 : foreach(cell, indexes)
21603 : {
21604 288 : Oid idxid = lfirst_oid(cell);
21605 : Oid parentidx;
21606 : Relation idx;
21607 : Oid constrOid;
21608 : Oid parentConstrOid;
21609 :
21610 288 : if (!has_superclass(idxid))
21611 8 : continue;
21612 :
21613 280 : parentidx = get_partition_parent(idxid, false);
21614 : Assert((IndexGetRelation(parentidx, false) == RelationGetRelid(rel)));
21615 :
21616 280 : idx = index_open(idxid, AccessExclusiveLock);
21617 280 : IndexSetParentIndex(idx, InvalidOid);
21618 :
21619 : /*
21620 : * If there's a constraint associated with the index, detach it too.
21621 : * Careful: it is possible for a constraint index in a partition to be
21622 : * the child of a non-constraint index, so verify whether the parent
21623 : * index does actually have a constraint.
21624 : */
21625 280 : constrOid = get_relation_idx_constraint_oid(RelationGetRelid(partRel),
21626 : idxid);
21627 280 : parentConstrOid = get_relation_idx_constraint_oid(RelationGetRelid(rel),
21628 : parentidx);
21629 280 : if (OidIsValid(parentConstrOid) && OidIsValid(constrOid))
21630 127 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21631 :
21632 280 : index_close(idx, NoLock);
21633 : }
21634 :
21635 : /* Update pg_class tuple */
21636 663 : classRel = table_open(RelationRelationId, RowExclusiveLock);
21637 663 : tuple = SearchSysCacheCopy1(RELOID,
21638 : ObjectIdGetDatum(RelationGetRelid(partRel)));
21639 663 : if (!HeapTupleIsValid(tuple))
21640 0 : elog(ERROR, "cache lookup failed for relation %u",
21641 : RelationGetRelid(partRel));
21642 : Assert(((Form_pg_class) GETSTRUCT(tuple))->relispartition);
21643 :
21644 : /* Clear relpartbound and reset relispartition */
21645 663 : memset(new_val, 0, sizeof(new_val));
21646 663 : memset(new_null, false, sizeof(new_null));
21647 663 : memset(new_repl, false, sizeof(new_repl));
21648 663 : new_val[Anum_pg_class_relpartbound - 1] = (Datum) 0;
21649 663 : new_null[Anum_pg_class_relpartbound - 1] = true;
21650 663 : new_repl[Anum_pg_class_relpartbound - 1] = true;
21651 663 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
21652 : new_val, new_null, new_repl);
21653 :
21654 663 : ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = false;
21655 663 : CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
21656 663 : heap_freetuple(newtuple);
21657 663 : table_close(classRel, RowExclusiveLock);
21658 :
21659 : /*
21660 : * Drop identity property from all identity columns of partition.
21661 : */
21662 2145 : for (int attno = 0; attno < RelationGetNumberOfAttributes(partRel); attno++)
21663 : {
21664 1482 : Form_pg_attribute attr = TupleDescAttr(partRel->rd_att, attno);
21665 :
21666 1482 : if (!attr->attisdropped && attr->attidentity)
21667 20 : ATExecDropIdentity(partRel, NameStr(attr->attname), false,
21668 : AccessExclusiveLock, true, true);
21669 : }
21670 :
21671 663 : if (OidIsValid(defaultPartOid))
21672 : {
21673 : /*
21674 : * If the relation being detached is the default partition itself,
21675 : * remove it from the parent's pg_partitioned_table entry.
21676 : *
21677 : * If not, we must invalidate default partition's relcache entry, as
21678 : * in StorePartitionBound: its partition constraint depends on every
21679 : * other partition's partition constraint.
21680 : */
21681 159 : if (RelationGetRelid(partRel) == defaultPartOid)
21682 29 : update_default_partition_oid(RelationGetRelid(rel), InvalidOid);
21683 : else
21684 130 : CacheInvalidateRelcacheByRelid(defaultPartOid);
21685 : }
21686 :
21687 : /*
21688 : * Invalidate the parent's relcache so that the partition is no longer
21689 : * included in its partition descriptor.
21690 : */
21691 663 : CacheInvalidateRelcache(rel);
21692 :
21693 : /*
21694 : * If the partition we just detached is partitioned itself, invalidate
21695 : * relcache for all descendent partitions too to ensure that their
21696 : * rd_partcheck expression trees are rebuilt; must lock partitions before
21697 : * doing so, using the same lockmode as what partRel has been locked with
21698 : * by the caller.
21699 : */
21700 663 : if (partRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
21701 : {
21702 : List *children;
21703 :
21704 41 : children = find_all_inheritors(RelationGetRelid(partRel),
21705 : AccessExclusiveLock, NULL);
21706 135 : foreach(cell, children)
21707 : {
21708 94 : CacheInvalidateRelcacheByRelid(lfirst_oid(cell));
21709 : }
21710 : }
21711 663 : }
21712 :
21713 : /*
21714 : * ALTER TABLE ... DETACH PARTITION ... FINALIZE
21715 : *
21716 : * To use when a DETACH PARTITION command previously did not run to
21717 : * completion; this completes the detaching process.
21718 : */
21719 : static ObjectAddress
21720 7 : ATExecDetachPartitionFinalize(Relation rel, RangeVar *name)
21721 : {
21722 : Relation partRel;
21723 : ObjectAddress address;
21724 7 : Snapshot snap = GetActiveSnapshot();
21725 :
21726 7 : partRel = table_openrv(name, AccessExclusiveLock);
21727 :
21728 : /*
21729 : * Wait until existing snapshots are gone. This is important if the
21730 : * second transaction of DETACH PARTITION CONCURRENTLY is canceled: the
21731 : * user could immediately run DETACH FINALIZE without actually waiting for
21732 : * existing transactions. We must not complete the detach action until
21733 : * all such queries are complete (otherwise we would present them with an
21734 : * inconsistent view of catalogs).
21735 : */
21736 7 : WaitForOlderSnapshots(snap->xmin, false);
21737 :
21738 7 : DetachPartitionFinalize(rel, partRel, true, InvalidOid);
21739 :
21740 7 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21741 :
21742 7 : table_close(partRel, NoLock);
21743 :
21744 7 : return address;
21745 : }
21746 :
21747 : /*
21748 : * DropClonedTriggersFromPartition
21749 : * subroutine for ATExecDetachPartition to remove any triggers that were
21750 : * cloned to the partition when it was created-as-partition or attached.
21751 : * This undoes what CloneRowTriggersToPartition did.
21752 : */
21753 : static void
21754 664 : DropClonedTriggersFromPartition(Oid partitionId)
21755 : {
21756 : ScanKeyData skey;
21757 : SysScanDesc scan;
21758 : HeapTuple trigtup;
21759 : Relation tgrel;
21760 : ObjectAddresses *objects;
21761 :
21762 664 : objects = new_object_addresses();
21763 :
21764 : /*
21765 : * Scan pg_trigger to search for all triggers on this rel.
21766 : */
21767 664 : ScanKeyInit(&skey, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21768 : F_OIDEQ, ObjectIdGetDatum(partitionId));
21769 664 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
21770 664 : scan = systable_beginscan(tgrel, TriggerRelidNameIndexId,
21771 : true, NULL, 1, &skey);
21772 1000 : while (HeapTupleIsValid(trigtup = systable_getnext(scan)))
21773 : {
21774 336 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(trigtup);
21775 : ObjectAddress trig;
21776 :
21777 : /* Ignore triggers that weren't cloned */
21778 336 : if (!OidIsValid(pg_trigger->tgparentid))
21779 296 : continue;
21780 :
21781 : /*
21782 : * Ignore internal triggers that are implementation objects of foreign
21783 : * keys, because these will be detached when the foreign keys
21784 : * themselves are.
21785 : */
21786 280 : if (OidIsValid(pg_trigger->tgconstrrelid))
21787 240 : continue;
21788 :
21789 : /*
21790 : * This is ugly, but necessary: remove the dependency markings on the
21791 : * trigger so that it can be removed.
21792 : */
21793 40 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21794 : TriggerRelationId,
21795 : DEPENDENCY_PARTITION_PRI);
21796 40 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21797 : RelationRelationId,
21798 : DEPENDENCY_PARTITION_SEC);
21799 :
21800 : /* remember this trigger to remove it below */
21801 40 : ObjectAddressSet(trig, TriggerRelationId, pg_trigger->oid);
21802 40 : add_exact_object_address(&trig, objects);
21803 : }
21804 :
21805 : /* make the dependency removal visible to the deletion below */
21806 664 : CommandCounterIncrement();
21807 664 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
21808 :
21809 : /* done */
21810 664 : free_object_addresses(objects);
21811 664 : systable_endscan(scan);
21812 664 : table_close(tgrel, RowExclusiveLock);
21813 664 : }
21814 :
21815 : /*
21816 : * Before acquiring lock on an index, acquire the same lock on the owning
21817 : * table.
21818 : */
21819 : struct AttachIndexCallbackState
21820 : {
21821 : Oid partitionOid;
21822 : Oid parentTblOid;
21823 : bool lockedParentTbl;
21824 : };
21825 :
21826 : static void
21827 254 : RangeVarCallbackForAttachIndex(const RangeVar *rv, Oid relOid, Oid oldRelOid,
21828 : void *arg)
21829 : {
21830 : struct AttachIndexCallbackState *state;
21831 : Form_pg_class classform;
21832 : HeapTuple tuple;
21833 :
21834 254 : state = (struct AttachIndexCallbackState *) arg;
21835 :
21836 254 : if (!state->lockedParentTbl)
21837 : {
21838 247 : LockRelationOid(state->parentTblOid, AccessShareLock);
21839 247 : state->lockedParentTbl = true;
21840 : }
21841 :
21842 : /*
21843 : * If we previously locked some other heap, and the name we're looking up
21844 : * no longer refers to an index on that relation, release the now-useless
21845 : * lock. XXX maybe we should do *after* we verify whether the index does
21846 : * not actually belong to the same relation ...
21847 : */
21848 254 : if (relOid != oldRelOid && OidIsValid(state->partitionOid))
21849 : {
21850 0 : UnlockRelationOid(state->partitionOid, AccessShareLock);
21851 0 : state->partitionOid = InvalidOid;
21852 : }
21853 :
21854 : /* Didn't find a relation, so no need for locking or permission checks. */
21855 254 : if (!OidIsValid(relOid))
21856 4 : return;
21857 :
21858 250 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
21859 250 : if (!HeapTupleIsValid(tuple))
21860 0 : return; /* concurrently dropped, so nothing to do */
21861 250 : classform = (Form_pg_class) GETSTRUCT(tuple);
21862 250 : if (classform->relkind != RELKIND_PARTITIONED_INDEX &&
21863 193 : classform->relkind != RELKIND_INDEX)
21864 4 : ereport(ERROR,
21865 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21866 : errmsg("\"%s\" is not an index", rv->relname)));
21867 246 : ReleaseSysCache(tuple);
21868 :
21869 : /*
21870 : * Since we need only examine the heap's tupledesc, an access share lock
21871 : * on it (preventing any DDL) is sufficient.
21872 : */
21873 246 : state->partitionOid = IndexGetRelation(relOid, false);
21874 246 : LockRelationOid(state->partitionOid, AccessShareLock);
21875 : }
21876 :
21877 : /*
21878 : * ALTER INDEX i1 ATTACH PARTITION i2
21879 : */
21880 : static ObjectAddress
21881 247 : ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx, RangeVar *name)
21882 : {
21883 : Relation partIdx;
21884 : Relation partTbl;
21885 : Relation parentTbl;
21886 : ObjectAddress address;
21887 : Oid partIdxId;
21888 : Oid currParent;
21889 : struct AttachIndexCallbackState state;
21890 :
21891 : /*
21892 : * We need to obtain lock on the index 'name' to modify it, but we also
21893 : * need to read its owning table's tuple descriptor -- so we need to lock
21894 : * both. To avoid deadlocks, obtain lock on the table before doing so on
21895 : * the index. Furthermore, we need to examine the parent table of the
21896 : * partition, so lock that one too.
21897 : */
21898 247 : state.partitionOid = InvalidOid;
21899 247 : state.parentTblOid = parentIdx->rd_index->indrelid;
21900 247 : state.lockedParentTbl = false;
21901 : partIdxId =
21902 247 : RangeVarGetRelidExtended(name, AccessExclusiveLock, 0,
21903 : RangeVarCallbackForAttachIndex,
21904 : &state);
21905 : /* Not there? */
21906 239 : if (!OidIsValid(partIdxId))
21907 0 : ereport(ERROR,
21908 : (errcode(ERRCODE_UNDEFINED_OBJECT),
21909 : errmsg("index \"%s\" does not exist", name->relname)));
21910 :
21911 : /* no deadlock risk: RangeVarGetRelidExtended already acquired the lock */
21912 239 : partIdx = relation_open(partIdxId, AccessExclusiveLock);
21913 :
21914 : /* we already hold locks on both tables, so this is safe: */
21915 239 : parentTbl = relation_open(parentIdx->rd_index->indrelid, AccessShareLock);
21916 239 : partTbl = relation_open(partIdx->rd_index->indrelid, NoLock);
21917 :
21918 239 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partIdx));
21919 :
21920 : /* Silently do nothing if already in the right state */
21921 478 : currParent = partIdx->rd_rel->relispartition ?
21922 239 : get_partition_parent(partIdxId, false) : InvalidOid;
21923 239 : if (currParent != RelationGetRelid(parentIdx))
21924 : {
21925 : IndexInfo *childInfo;
21926 : IndexInfo *parentInfo;
21927 : AttrMap *attmap;
21928 : bool found;
21929 : int i;
21930 : PartitionDesc partDesc;
21931 : Oid constraintOid,
21932 223 : cldConstrId = InvalidOid;
21933 :
21934 : /*
21935 : * If this partition already has an index attached, refuse the
21936 : * operation.
21937 : */
21938 223 : refuseDupeIndexAttach(parentIdx, partIdx, partTbl);
21939 :
21940 219 : if (OidIsValid(currParent))
21941 0 : ereport(ERROR,
21942 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21943 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21944 : RelationGetRelationName(partIdx),
21945 : RelationGetRelationName(parentIdx)),
21946 : errdetail("Index \"%s\" is already attached to another index.",
21947 : RelationGetRelationName(partIdx))));
21948 :
21949 : /* Make sure it indexes a partition of the other index's table */
21950 219 : partDesc = RelationGetPartitionDesc(parentTbl, true);
21951 219 : found = false;
21952 336 : for (i = 0; i < partDesc->nparts; i++)
21953 : {
21954 332 : if (partDesc->oids[i] == state.partitionOid)
21955 : {
21956 215 : found = true;
21957 215 : break;
21958 : }
21959 : }
21960 219 : if (!found)
21961 4 : ereport(ERROR,
21962 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21963 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21964 : RelationGetRelationName(partIdx),
21965 : RelationGetRelationName(parentIdx)),
21966 : errdetail("Index \"%s\" is not an index on any partition of table \"%s\".",
21967 : RelationGetRelationName(partIdx),
21968 : RelationGetRelationName(parentTbl))));
21969 :
21970 : /* Ensure the indexes are compatible */
21971 215 : childInfo = BuildIndexInfo(partIdx);
21972 215 : parentInfo = BuildIndexInfo(parentIdx);
21973 215 : attmap = build_attrmap_by_name(RelationGetDescr(partTbl),
21974 : RelationGetDescr(parentTbl),
21975 : false);
21976 215 : if (!CompareIndexInfo(childInfo, parentInfo,
21977 215 : partIdx->rd_indcollation,
21978 215 : parentIdx->rd_indcollation,
21979 215 : partIdx->rd_opfamily,
21980 215 : parentIdx->rd_opfamily,
21981 : attmap))
21982 28 : ereport(ERROR,
21983 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21984 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21985 : RelationGetRelationName(partIdx),
21986 : RelationGetRelationName(parentIdx)),
21987 : errdetail("The index definitions do not match.")));
21988 :
21989 : /*
21990 : * If there is a constraint in the parent, make sure there is one in
21991 : * the child too.
21992 : */
21993 187 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(parentTbl),
21994 : RelationGetRelid(parentIdx));
21995 :
21996 187 : if (OidIsValid(constraintOid))
21997 : {
21998 71 : cldConstrId = get_relation_idx_constraint_oid(RelationGetRelid(partTbl),
21999 : partIdxId);
22000 71 : if (!OidIsValid(cldConstrId))
22001 4 : ereport(ERROR,
22002 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
22003 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
22004 : RelationGetRelationName(partIdx),
22005 : RelationGetRelationName(parentIdx)),
22006 : errdetail("The index \"%s\" belongs to a constraint in table \"%s\" but no constraint exists for index \"%s\".",
22007 : RelationGetRelationName(parentIdx),
22008 : RelationGetRelationName(parentTbl),
22009 : RelationGetRelationName(partIdx))));
22010 : }
22011 :
22012 : /*
22013 : * If it's a primary key, make sure the columns in the partition are
22014 : * NOT NULL.
22015 : */
22016 183 : if (parentIdx->rd_index->indisprimary)
22017 55 : verifyPartitionIndexNotNull(childInfo, partTbl);
22018 :
22019 : /* All good -- do it */
22020 183 : IndexSetParentIndex(partIdx, RelationGetRelid(parentIdx));
22021 183 : if (OidIsValid(constraintOid))
22022 67 : ConstraintSetParentConstraint(cldConstrId, constraintOid,
22023 : RelationGetRelid(partTbl));
22024 :
22025 183 : free_attrmap(attmap);
22026 :
22027 183 : validatePartitionedIndex(parentIdx, parentTbl);
22028 : }
22029 :
22030 199 : relation_close(parentTbl, AccessShareLock);
22031 : /* keep these locks till commit */
22032 199 : relation_close(partTbl, NoLock);
22033 199 : relation_close(partIdx, NoLock);
22034 :
22035 199 : return address;
22036 : }
22037 :
22038 : /*
22039 : * Verify whether the given partition already contains an index attached
22040 : * to the given partitioned index. If so, raise an error.
22041 : */
22042 : static void
22043 223 : refuseDupeIndexAttach(Relation parentIdx, Relation partIdx, Relation partitionTbl)
22044 : {
22045 : Oid existingIdx;
22046 :
22047 223 : existingIdx = index_get_partition(partitionTbl,
22048 : RelationGetRelid(parentIdx));
22049 223 : if (OidIsValid(existingIdx))
22050 4 : ereport(ERROR,
22051 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
22052 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
22053 : RelationGetRelationName(partIdx),
22054 : RelationGetRelationName(parentIdx)),
22055 : errdetail("Another index \"%s\" is already attached for partition \"%s\".",
22056 : get_rel_name(existingIdx),
22057 : RelationGetRelationName(partitionTbl))));
22058 219 : }
22059 :
22060 : /*
22061 : * Verify whether the set of attached partition indexes to a parent index on
22062 : * a partitioned table is complete. If it is, mark the parent index valid.
22063 : *
22064 : * This should be called each time a partition index is attached.
22065 : */
22066 : static void
22067 211 : validatePartitionedIndex(Relation partedIdx, Relation partedTbl)
22068 : {
22069 : Relation inheritsRel;
22070 : SysScanDesc scan;
22071 : ScanKeyData key;
22072 211 : int tuples = 0;
22073 : HeapTuple inhTup;
22074 211 : bool updated = false;
22075 :
22076 : Assert(partedIdx->rd_rel->relkind == RELKIND_PARTITIONED_INDEX);
22077 :
22078 : /*
22079 : * Scan pg_inherits for this parent index. Count each valid index we find
22080 : * (verifying the pg_index entry for each), and if we reach the total
22081 : * amount we expect, we can mark this parent index as valid.
22082 : */
22083 211 : inheritsRel = table_open(InheritsRelationId, AccessShareLock);
22084 211 : ScanKeyInit(&key, Anum_pg_inherits_inhparent,
22085 : BTEqualStrategyNumber, F_OIDEQ,
22086 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
22087 211 : scan = systable_beginscan(inheritsRel, InheritsParentIndexId, true,
22088 : NULL, 1, &key);
22089 541 : while ((inhTup = systable_getnext(scan)) != NULL)
22090 : {
22091 330 : Form_pg_inherits inhForm = (Form_pg_inherits) GETSTRUCT(inhTup);
22092 : HeapTuple indTup;
22093 : Form_pg_index indexForm;
22094 :
22095 330 : indTup = SearchSysCache1(INDEXRELID,
22096 : ObjectIdGetDatum(inhForm->inhrelid));
22097 330 : if (!HeapTupleIsValid(indTup))
22098 0 : elog(ERROR, "cache lookup failed for index %u", inhForm->inhrelid);
22099 330 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
22100 330 : if (indexForm->indisvalid)
22101 292 : tuples += 1;
22102 330 : ReleaseSysCache(indTup);
22103 : }
22104 :
22105 : /* Done with pg_inherits */
22106 211 : systable_endscan(scan);
22107 211 : table_close(inheritsRel, AccessShareLock);
22108 :
22109 : /*
22110 : * If we found as many inherited indexes as the partitioned table has
22111 : * partitions, we're good; update pg_index to set indisvalid.
22112 : */
22113 211 : if (tuples == RelationGetPartitionDesc(partedTbl, true)->nparts)
22114 : {
22115 : Relation idxRel;
22116 : HeapTuple indTup;
22117 : Form_pg_index indexForm;
22118 :
22119 108 : idxRel = table_open(IndexRelationId, RowExclusiveLock);
22120 108 : indTup = SearchSysCacheCopy1(INDEXRELID,
22121 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
22122 108 : if (!HeapTupleIsValid(indTup))
22123 0 : elog(ERROR, "cache lookup failed for index %u",
22124 : RelationGetRelid(partedIdx));
22125 108 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
22126 :
22127 108 : indexForm->indisvalid = true;
22128 108 : updated = true;
22129 :
22130 108 : CatalogTupleUpdate(idxRel, &indTup->t_self, indTup);
22131 :
22132 108 : table_close(idxRel, RowExclusiveLock);
22133 108 : heap_freetuple(indTup);
22134 : }
22135 :
22136 : /*
22137 : * If this index is in turn a partition of a larger index, validating it
22138 : * might cause the parent to become valid also. Try that.
22139 : */
22140 211 : if (updated && partedIdx->rd_rel->relispartition)
22141 : {
22142 : Oid parentIdxId,
22143 : parentTblId;
22144 : Relation parentIdx,
22145 : parentTbl;
22146 :
22147 : /* make sure we see the validation we just did */
22148 28 : CommandCounterIncrement();
22149 :
22150 28 : parentIdxId = get_partition_parent(RelationGetRelid(partedIdx), false);
22151 28 : parentTblId = get_partition_parent(RelationGetRelid(partedTbl), false);
22152 28 : parentIdx = relation_open(parentIdxId, AccessExclusiveLock);
22153 28 : parentTbl = relation_open(parentTblId, AccessExclusiveLock);
22154 : Assert(!parentIdx->rd_index->indisvalid);
22155 :
22156 28 : validatePartitionedIndex(parentIdx, parentTbl);
22157 :
22158 28 : relation_close(parentIdx, AccessExclusiveLock);
22159 28 : relation_close(parentTbl, AccessExclusiveLock);
22160 : }
22161 211 : }
22162 :
22163 : /*
22164 : * When attaching an index as a partition of a partitioned index which is a
22165 : * primary key, verify that all the columns in the partition are marked NOT
22166 : * NULL.
22167 : */
22168 : static void
22169 55 : verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition)
22170 : {
22171 111 : for (int i = 0; i < iinfo->ii_NumIndexKeyAttrs; i++)
22172 : {
22173 56 : Form_pg_attribute att = TupleDescAttr(RelationGetDescr(partition),
22174 56 : iinfo->ii_IndexAttrNumbers[i] - 1);
22175 :
22176 56 : if (!att->attnotnull)
22177 0 : ereport(ERROR,
22178 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
22179 : errmsg("invalid primary key definition"),
22180 : errdetail("Column \"%s\" of relation \"%s\" is not marked NOT NULL.",
22181 : NameStr(att->attname),
22182 : RelationGetRelationName(partition)));
22183 : }
22184 55 : }
22185 :
22186 : /*
22187 : * Return an OID list of constraints that reference the given relation
22188 : * that are marked as having a parent constraints.
22189 : */
22190 : static List *
22191 1000 : GetParentedForeignKeyRefs(Relation partition)
22192 : {
22193 : Relation pg_constraint;
22194 : HeapTuple tuple;
22195 : SysScanDesc scan;
22196 : ScanKeyData key[2];
22197 1000 : List *constraints = NIL;
22198 :
22199 : /*
22200 : * If no indexes, or no columns are referenceable by FKs, we can avoid the
22201 : * scan.
22202 : */
22203 1411 : if (RelationGetIndexList(partition) == NIL ||
22204 411 : bms_is_empty(RelationGetIndexAttrBitmap(partition,
22205 : INDEX_ATTR_BITMAP_KEY)))
22206 757 : return NIL;
22207 :
22208 : /* Search for constraints referencing this table */
22209 243 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
22210 243 : ScanKeyInit(&key[0],
22211 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
22212 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(partition)));
22213 243 : ScanKeyInit(&key[1],
22214 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
22215 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
22216 :
22217 : /* XXX This is a seqscan, as we don't have a usable index */
22218 243 : scan = systable_beginscan(pg_constraint, InvalidOid, true, NULL, 2, key);
22219 364 : while ((tuple = systable_getnext(scan)) != NULL)
22220 : {
22221 121 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
22222 :
22223 : /*
22224 : * We only need to process constraints that are part of larger ones.
22225 : */
22226 121 : if (!OidIsValid(constrForm->conparentid))
22227 0 : continue;
22228 :
22229 121 : constraints = lappend_oid(constraints, constrForm->oid);
22230 : }
22231 :
22232 243 : systable_endscan(scan);
22233 243 : table_close(pg_constraint, AccessShareLock);
22234 :
22235 243 : return constraints;
22236 : }
22237 :
22238 : /*
22239 : * During DETACH PARTITION, verify that any foreign keys pointing to the
22240 : * partitioned table would not become invalid. An error is raised if any
22241 : * referenced values exist.
22242 : */
22243 : static void
22244 336 : ATDetachCheckNoForeignKeyRefs(Relation partition)
22245 : {
22246 : List *constraints;
22247 : ListCell *cell;
22248 :
22249 336 : constraints = GetParentedForeignKeyRefs(partition);
22250 :
22251 379 : foreach(cell, constraints)
22252 : {
22253 65 : Oid constrOid = lfirst_oid(cell);
22254 : HeapTuple tuple;
22255 : Form_pg_constraint constrForm;
22256 : Relation rel;
22257 65 : Trigger trig = {0};
22258 :
22259 65 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
22260 65 : if (!HeapTupleIsValid(tuple))
22261 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
22262 65 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
22263 :
22264 : Assert(OidIsValid(constrForm->conparentid));
22265 : Assert(constrForm->confrelid == RelationGetRelid(partition));
22266 :
22267 : /* prevent data changes into the referencing table until commit */
22268 65 : rel = table_open(constrForm->conrelid, ShareLock);
22269 :
22270 65 : trig.tgoid = InvalidOid;
22271 65 : trig.tgname = NameStr(constrForm->conname);
22272 65 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
22273 65 : trig.tgisinternal = true;
22274 65 : trig.tgconstrrelid = RelationGetRelid(partition);
22275 65 : trig.tgconstrindid = constrForm->conindid;
22276 65 : trig.tgconstraint = constrForm->oid;
22277 65 : trig.tgdeferrable = false;
22278 65 : trig.tginitdeferred = false;
22279 : /* we needn't fill in remaining fields */
22280 :
22281 65 : RI_PartitionRemove_Check(&trig, rel, partition);
22282 :
22283 43 : ReleaseSysCache(tuple);
22284 :
22285 43 : table_close(rel, NoLock);
22286 : }
22287 314 : }
22288 :
22289 : /*
22290 : * resolve column compression specification to compression method.
22291 : */
22292 : static char
22293 156429 : GetAttributeCompression(Oid atttypid, const char *compression)
22294 : {
22295 : char cmethod;
22296 :
22297 156429 : if (compression == NULL || strcmp(compression, "default") == 0)
22298 156292 : return InvalidCompressionMethod;
22299 :
22300 : /*
22301 : * To specify a nondefault method, the column data type must be toastable.
22302 : * Note this says nothing about whether the column's attstorage setting
22303 : * permits compression; we intentionally allow attstorage and
22304 : * attcompression to be independent. But with a non-toastable type,
22305 : * attstorage could not be set to a value that would permit compression.
22306 : *
22307 : * We don't actually need to enforce this, since nothing bad would happen
22308 : * if attcompression were non-default; it would never be consulted. But
22309 : * it seems more user-friendly to complain about a certainly-useless
22310 : * attempt to set the property.
22311 : */
22312 137 : if (!TypeIsToastable(atttypid))
22313 4 : ereport(ERROR,
22314 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
22315 : errmsg("column data type %s does not support compression",
22316 : format_type_be(atttypid))));
22317 :
22318 133 : cmethod = CompressionNameToMethod(compression);
22319 133 : if (!CompressionMethodIsValid(cmethod))
22320 8 : ereport(ERROR,
22321 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
22322 : errmsg("invalid compression method \"%s\"", compression)));
22323 :
22324 125 : return cmethod;
22325 : }
22326 :
22327 : /*
22328 : * resolve column storage specification
22329 : */
22330 : static char
22331 204 : GetAttributeStorage(Oid atttypid, const char *storagemode)
22332 : {
22333 204 : char cstorage = 0;
22334 :
22335 204 : if (pg_strcasecmp(storagemode, "plain") == 0)
22336 37 : cstorage = TYPSTORAGE_PLAIN;
22337 167 : else if (pg_strcasecmp(storagemode, "external") == 0)
22338 104 : cstorage = TYPSTORAGE_EXTERNAL;
22339 63 : else if (pg_strcasecmp(storagemode, "extended") == 0)
22340 26 : cstorage = TYPSTORAGE_EXTENDED;
22341 37 : else if (pg_strcasecmp(storagemode, "main") == 0)
22342 33 : cstorage = TYPSTORAGE_MAIN;
22343 4 : else if (pg_strcasecmp(storagemode, "default") == 0)
22344 4 : cstorage = get_typstorage(atttypid);
22345 : else
22346 0 : ereport(ERROR,
22347 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
22348 : errmsg("invalid storage type \"%s\"",
22349 : storagemode)));
22350 :
22351 : /*
22352 : * safety check: do not allow toasted storage modes unless column datatype
22353 : * is TOAST-aware.
22354 : */
22355 204 : if (!(cstorage == TYPSTORAGE_PLAIN || TypeIsToastable(atttypid)))
22356 4 : ereport(ERROR,
22357 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
22358 : errmsg("column data type %s can only have storage PLAIN",
22359 : format_type_be(atttypid))));
22360 :
22361 200 : return cstorage;
22362 : }
22363 :
22364 : /*
22365 : * buildExpressionExecutionStates: build the needed expression execution states
22366 : * for new partition (newPartRel) checks and initialize expressions for
22367 : * generated columns. All expressions should be created in "tab"
22368 : * (AlteredTableInfo structure).
22369 : */
22370 : static void
22371 420 : buildExpressionExecutionStates(AlteredTableInfo *tab, Relation newPartRel, EState *estate)
22372 : {
22373 : /*
22374 : * Build the needed expression execution states. Here, we expect only NOT
22375 : * NULL and CHECK constraint.
22376 : */
22377 856 : foreach_ptr(NewConstraint, con, tab->constraints)
22378 : {
22379 16 : switch (con->contype)
22380 : {
22381 16 : case CONSTR_CHECK:
22382 :
22383 : /*
22384 : * We already expanded virtual expression in
22385 : * createTableConstraints.
22386 : */
22387 16 : con->qualstate = ExecPrepareExpr((Expr *) con->qual, estate);
22388 16 : break;
22389 0 : case CONSTR_NOTNULL:
22390 : /* Nothing to do here. */
22391 0 : break;
22392 0 : default:
22393 0 : elog(ERROR, "unrecognized constraint type: %d",
22394 : (int) con->contype);
22395 : }
22396 : }
22397 :
22398 : /* Expression already planned in createTableConstraints */
22399 884 : foreach_ptr(NewColumnValue, ex, tab->newvals)
22400 44 : ex->exprstate = ExecInitExpr((Expr *) ex->expr, NULL);
22401 420 : }
22402 :
22403 : /*
22404 : * evaluateGeneratedExpressionsAndCheckConstraints: evaluate any generated
22405 : * expressions for "tab" (AlteredTableInfo structure) whose inputs come from
22406 : * the new tuple (insertslot) of the new partition (newPartRel).
22407 : */
22408 : static void
22409 664 : evaluateGeneratedExpressionsAndCheckConstraints(AlteredTableInfo *tab,
22410 : Relation newPartRel,
22411 : TupleTableSlot *insertslot,
22412 : ExprContext *econtext)
22413 : {
22414 664 : econtext->ecxt_scantuple = insertslot;
22415 :
22416 1392 : foreach_ptr(NewColumnValue, ex, tab->newvals)
22417 : {
22418 64 : if (!ex->is_generated)
22419 0 : continue;
22420 :
22421 64 : insertslot->tts_values[ex->attnum - 1]
22422 64 : = ExecEvalExpr(ex->exprstate,
22423 : econtext,
22424 64 : &insertslot->tts_isnull[ex->attnum - 1]);
22425 : }
22426 :
22427 1352 : foreach_ptr(NewConstraint, con, tab->constraints)
22428 : {
22429 24 : switch (con->contype)
22430 : {
22431 24 : case CONSTR_CHECK:
22432 24 : if (!ExecCheck(con->qualstate, econtext))
22433 0 : ereport(ERROR,
22434 : errcode(ERRCODE_CHECK_VIOLATION),
22435 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
22436 : con->name, RelationGetRelationName(newPartRel)),
22437 : errtableconstraint(newPartRel, con->name));
22438 24 : break;
22439 0 : case CONSTR_NOTNULL:
22440 : case CONSTR_FOREIGN:
22441 : /* Nothing to do here */
22442 0 : break;
22443 0 : default:
22444 0 : elog(ERROR, "unrecognized constraint type: %d",
22445 : (int) con->contype);
22446 : }
22447 : }
22448 664 : }
22449 :
22450 : /*
22451 : * getAttributesList: build a list of columns (ColumnDef) based on parent_rel
22452 : */
22453 : static List *
22454 440 : getAttributesList(Relation parent_rel)
22455 : {
22456 : AttrNumber parent_attno;
22457 : TupleDesc modelDesc;
22458 440 : List *colList = NIL;
22459 :
22460 440 : modelDesc = RelationGetDescr(parent_rel);
22461 :
22462 1581 : for (parent_attno = 1; parent_attno <= modelDesc->natts;
22463 1141 : parent_attno++)
22464 : {
22465 1141 : Form_pg_attribute attribute = TupleDescAttr(modelDesc,
22466 : parent_attno - 1);
22467 : ColumnDef *def;
22468 :
22469 : /* Ignore dropped columns in the parent. */
22470 1141 : if (attribute->attisdropped)
22471 0 : continue;
22472 :
22473 1141 : def = makeColumnDef(NameStr(attribute->attname), attribute->atttypid,
22474 : attribute->atttypmod, attribute->attcollation);
22475 :
22476 1141 : def->is_not_null = attribute->attnotnull;
22477 :
22478 : /* Copy identity. */
22479 1141 : def->identity = attribute->attidentity;
22480 :
22481 : /* Copy attgenerated. */
22482 1141 : def->generated = attribute->attgenerated;
22483 :
22484 1141 : def->storage = attribute->attstorage;
22485 :
22486 : /* Likewise, copy compression. */
22487 1141 : if (CompressionMethodIsValid(attribute->attcompression))
22488 12 : def->compression =
22489 12 : pstrdup(GetCompressionMethodName(attribute->attcompression));
22490 : else
22491 1129 : def->compression = NULL;
22492 :
22493 : /* Add to column list. */
22494 1141 : colList = lappend(colList, def);
22495 : }
22496 :
22497 440 : return colList;
22498 : }
22499 :
22500 : /*
22501 : * createTableConstraints:
22502 : * create check constraints, default values, and generated values for newRel
22503 : * based on parent_rel. tab is pending-work queue for newRel, we may need it in
22504 : * MergePartitionsMoveRows.
22505 : */
22506 : static void
22507 420 : createTableConstraints(List **wqueue, AlteredTableInfo *tab,
22508 : Relation parent_rel, Relation newRel)
22509 : {
22510 : TupleDesc tupleDesc;
22511 : TupleConstr *constr;
22512 : AttrMap *attmap;
22513 : AttrNumber parent_attno;
22514 : int ccnum;
22515 420 : List *constraints = NIL;
22516 420 : List *cookedConstraints = NIL;
22517 :
22518 420 : tupleDesc = RelationGetDescr(parent_rel);
22519 420 : constr = tupleDesc->constr;
22520 :
22521 420 : if (!constr)
22522 264 : return;
22523 :
22524 : /*
22525 : * Construct a map from the parent relation's attnos to the child rel's.
22526 : * This re-checks type match, etc, although it shouldn't be possible to
22527 : * have a failure since both tables are locked.
22528 : */
22529 156 : attmap = build_attrmap_by_name(RelationGetDescr(newRel),
22530 : tupleDesc,
22531 : false);
22532 :
22533 : /* Cycle for default values. */
22534 592 : for (parent_attno = 1; parent_attno <= tupleDesc->natts; parent_attno++)
22535 : {
22536 436 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
22537 : parent_attno - 1);
22538 :
22539 : /* Ignore dropped columns in the parent. */
22540 436 : if (attribute->attisdropped)
22541 0 : continue;
22542 :
22543 : /* Copy the default, if present, and it should be copied. */
22544 436 : if (attribute->atthasdef)
22545 : {
22546 100 : Node *this_default = NULL;
22547 : bool found_whole_row;
22548 : AttrNumber num;
22549 : Node *def;
22550 : NewColumnValue *newval;
22551 :
22552 100 : if (attribute->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
22553 4 : this_default = build_generation_expression(parent_rel, attribute->attnum);
22554 : else
22555 : {
22556 96 : this_default = TupleDescGetDefault(tupleDesc, attribute->attnum);
22557 96 : if (this_default == NULL)
22558 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
22559 : attribute->attnum, RelationGetRelationName(parent_rel));
22560 : }
22561 :
22562 100 : num = attmap->attnums[parent_attno - 1];
22563 100 : def = map_variable_attnos(this_default, 1, 0, attmap, InvalidOid, &found_whole_row);
22564 :
22565 100 : if (found_whole_row && attribute->attgenerated != '\0')
22566 0 : elog(ERROR, "cannot convert whole-row table reference");
22567 :
22568 : /* Add a pre-cooked default expression. */
22569 100 : StoreAttrDefault(newRel, num, def, true);
22570 :
22571 : /*
22572 : * Stored generated column expressions in parent_rel might
22573 : * reference the tableoid. newRel, parent_rel tableoid clear is
22574 : * not the same. If so, these stored generated columns require
22575 : * recomputation for newRel within MergePartitionsMoveRows.
22576 : */
22577 100 : if (attribute->attgenerated == ATTRIBUTE_GENERATED_STORED)
22578 : {
22579 44 : newval = palloc0_object(NewColumnValue);
22580 44 : newval->attnum = num;
22581 44 : newval->expr = expression_planner((Expr *) def);
22582 44 : newval->is_generated = (attribute->attgenerated != '\0');
22583 44 : tab->newvals = lappend(tab->newvals, newval);
22584 : }
22585 : }
22586 : }
22587 :
22588 : /* Cycle for CHECK constraints. */
22589 224 : for (ccnum = 0; ccnum < constr->num_check; ccnum++)
22590 : {
22591 68 : char *ccname = constr->check[ccnum].ccname;
22592 68 : char *ccbin = constr->check[ccnum].ccbin;
22593 68 : bool ccenforced = constr->check[ccnum].ccenforced;
22594 68 : bool ccnoinherit = constr->check[ccnum].ccnoinherit;
22595 68 : bool ccvalid = constr->check[ccnum].ccvalid;
22596 : Node *ccbin_node;
22597 : bool found_whole_row;
22598 : Constraint *constr;
22599 :
22600 : /*
22601 : * The partitioned table can not have a NO INHERIT check constraint
22602 : * (see StoreRelCheck function for details).
22603 : */
22604 : Assert(!ccnoinherit);
22605 :
22606 68 : ccbin_node = map_variable_attnos(stringToNode(ccbin),
22607 : 1, 0,
22608 : attmap,
22609 : InvalidOid, &found_whole_row);
22610 :
22611 : /*
22612 : * For the moment we have to reject whole-row variables (as for CREATE
22613 : * TABLE LIKE and inheritances).
22614 : */
22615 68 : if (found_whole_row)
22616 0 : elog(ERROR, "Constraint \"%s\" contains a whole-row reference to table \"%s\".",
22617 : ccname,
22618 : RelationGetRelationName(parent_rel));
22619 :
22620 68 : constr = makeNode(Constraint);
22621 68 : constr->contype = CONSTR_CHECK;
22622 68 : constr->conname = pstrdup(ccname);
22623 68 : constr->deferrable = false;
22624 68 : constr->initdeferred = false;
22625 68 : constr->is_enforced = ccenforced;
22626 68 : constr->skip_validation = !ccvalid;
22627 68 : constr->initially_valid = ccvalid;
22628 68 : constr->is_no_inherit = ccnoinherit;
22629 68 : constr->raw_expr = NULL;
22630 68 : constr->cooked_expr = nodeToString(ccbin_node);
22631 68 : constr->location = -1;
22632 68 : constraints = lappend(constraints, constr);
22633 : }
22634 :
22635 : /* Install all CHECK constraints. */
22636 156 : cookedConstraints = AddRelationNewConstraints(newRel, NIL, constraints,
22637 : false, true, true, NULL);
22638 :
22639 : /* Make the additional catalog changes visible. */
22640 156 : CommandCounterIncrement();
22641 :
22642 : /*
22643 : * parent_rel check constraint expression may reference tableoid, so later
22644 : * in MergePartitionsMoveRows, we need to evaluate the check constraint
22645 : * again for the newRel. We can check whether the check constraint
22646 : * contains a tableoid reference via pull_varattnos.
22647 : */
22648 380 : foreach_ptr(CookedConstraint, ccon, cookedConstraints)
22649 : {
22650 68 : if (!ccon->skip_validation)
22651 : {
22652 : Node *qual;
22653 44 : Bitmapset *attnums = NULL;
22654 :
22655 : Assert(ccon->contype == CONSTR_CHECK);
22656 44 : qual = expand_generated_columns_in_expr(ccon->expr, newRel, 1);
22657 44 : pull_varattnos(qual, 1, &attnums);
22658 :
22659 : /*
22660 : * Add a check only if it contains a tableoid
22661 : * (TableOidAttributeNumber).
22662 : */
22663 44 : if (bms_is_member(TableOidAttributeNumber - FirstLowInvalidHeapAttributeNumber,
22664 : attnums))
22665 : {
22666 : NewConstraint *newcon;
22667 :
22668 16 : newcon = palloc0_object(NewConstraint);
22669 16 : newcon->name = ccon->name;
22670 16 : newcon->contype = CONSTR_CHECK;
22671 16 : newcon->qual = qual;
22672 :
22673 16 : tab->constraints = lappend(tab->constraints, newcon);
22674 : }
22675 : }
22676 : }
22677 :
22678 : /* Don't need the cookedConstraints anymore. */
22679 156 : list_free_deep(cookedConstraints);
22680 :
22681 : /* Reproduce not-null constraints. */
22682 156 : if (constr->has_not_null)
22683 : {
22684 : List *nnconstraints;
22685 :
22686 : /*
22687 : * The "include_noinh" argument is false because a partitioned table
22688 : * can't have NO INHERIT constraint.
22689 : */
22690 108 : nnconstraints = RelationGetNotNullConstraints(RelationGetRelid(parent_rel),
22691 : false, false);
22692 :
22693 : Assert(list_length(nnconstraints) > 0);
22694 :
22695 : /*
22696 : * We already set pg_attribute.attnotnull in createPartitionTable. No
22697 : * need call set_attnotnull again.
22698 : */
22699 108 : AddRelationNewConstraints(newRel, NIL, nnconstraints, false, true, true, NULL);
22700 : }
22701 : }
22702 :
22703 : /*
22704 : * createPartitionTable:
22705 : *
22706 : * Create a new partition (newPartName) for the partitioned table (parent_rel).
22707 : * ownerId is determined by the partition on which the operation is performed,
22708 : * so it is passed separately. The new partition will inherit the access method
22709 : * and persistence type from the parent table.
22710 : *
22711 : * Returns the created relation (locked in AccessExclusiveLock mode).
22712 : */
22713 : static Relation
22714 440 : createPartitionTable(List **wqueue, RangeVar *newPartName,
22715 : Relation parent_rel, Oid ownerId)
22716 : {
22717 : Relation newRel;
22718 : Oid newRelId;
22719 : Oid existingRelid;
22720 : TupleDesc descriptor;
22721 440 : List *colList = NIL;
22722 : Oid relamId;
22723 : Oid namespaceId;
22724 : AlteredTableInfo *new_partrel_tab;
22725 440 : Form_pg_class parent_relform = parent_rel->rd_rel;
22726 :
22727 : /* If the existing rel is temp, it must belong to this session. */
22728 440 : if (RELATION_IS_OTHER_TEMP(parent_rel))
22729 0 : ereport(ERROR,
22730 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22731 : errmsg("cannot create as partition of temporary relation of another session"));
22732 :
22733 : /* Look up inheritance ancestors and generate the relation schema. */
22734 440 : colList = getAttributesList(parent_rel);
22735 :
22736 : /* Create a tuple descriptor from the relation schema. */
22737 440 : descriptor = BuildDescForRelation(colList);
22738 :
22739 : /* Look up the access method for the new relation. */
22740 440 : relamId = (parent_relform->relam != InvalidOid) ? parent_relform->relam : HEAP_TABLE_AM_OID;
22741 :
22742 : /* Look up the namespace in which we are supposed to create the relation. */
22743 : namespaceId =
22744 440 : RangeVarGetAndCheckCreationNamespace(newPartName, NoLock, &existingRelid);
22745 440 : if (OidIsValid(existingRelid))
22746 0 : ereport(ERROR,
22747 : errcode(ERRCODE_DUPLICATE_TABLE),
22748 : errmsg("relation \"%s\" already exists", newPartName->relname));
22749 :
22750 : /*
22751 : * We intended to create the partition with the same persistence as the
22752 : * parent table, but we still need to recheck because that might be
22753 : * affected by the search_path. If the parent is permanent, so must be
22754 : * all of its partitions.
22755 : */
22756 440 : if (parent_relform->relpersistence != RELPERSISTENCE_TEMP &&
22757 404 : newPartName->relpersistence == RELPERSISTENCE_TEMP)
22758 8 : ereport(ERROR,
22759 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22760 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
22761 : RelationGetRelationName(parent_rel)));
22762 :
22763 : /* Permanent rels cannot be partitions belonging to a temporary parent. */
22764 432 : if (newPartName->relpersistence != RELPERSISTENCE_TEMP &&
22765 408 : parent_relform->relpersistence == RELPERSISTENCE_TEMP)
22766 12 : ereport(ERROR,
22767 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
22768 : errmsg("cannot create a permanent relation as partition of temporary relation \"%s\"",
22769 : RelationGetRelationName(parent_rel)));
22770 :
22771 : /* Create the relation. */
22772 420 : newRelId = heap_create_with_catalog(newPartName->relname,
22773 : namespaceId,
22774 : parent_relform->reltablespace,
22775 : InvalidOid,
22776 : InvalidOid,
22777 : InvalidOid,
22778 : ownerId,
22779 : relamId,
22780 : descriptor,
22781 : NIL,
22782 : RELKIND_RELATION,
22783 420 : newPartName->relpersistence,
22784 : false,
22785 : false,
22786 : ONCOMMIT_NOOP,
22787 : (Datum) 0,
22788 : true,
22789 : allowSystemTableMods,
22790 : true,
22791 : InvalidOid,
22792 : NULL);
22793 :
22794 : /*
22795 : * We must bump the command counter to make the newly-created relation
22796 : * tuple visible for opening.
22797 : */
22798 420 : CommandCounterIncrement();
22799 :
22800 : /*
22801 : * Open the new partition with no lock, because we already have an
22802 : * AccessExclusiveLock placed there after creation.
22803 : */
22804 420 : newRel = table_open(newRelId, NoLock);
22805 :
22806 : /* Find or create a work queue entry for the newly created table. */
22807 420 : new_partrel_tab = ATGetQueueEntry(wqueue, newRel);
22808 :
22809 : /* Create constraints, default values, and generated values. */
22810 420 : createTableConstraints(wqueue, new_partrel_tab, parent_rel, newRel);
22811 :
22812 : /*
22813 : * Need to call CommandCounterIncrement, so a fresh relcache entry has
22814 : * newly installed constraint info.
22815 : */
22816 420 : CommandCounterIncrement();
22817 :
22818 420 : return newRel;
22819 : }
22820 :
22821 : /*
22822 : * MergePartitionsMoveRows: scan partitions to be merged (mergingPartitions)
22823 : * of the partitioned table and move rows into the new partition
22824 : * (newPartRel). We also verify check constraints against these rows.
22825 : */
22826 : static void
22827 88 : MergePartitionsMoveRows(List **wqueue, List *mergingPartitions, Relation newPartRel)
22828 : {
22829 : CommandId mycid;
22830 : EState *estate;
22831 : AlteredTableInfo *tab;
22832 : ListCell *ltab;
22833 :
22834 : /* The FSM is empty, so don't bother using it. */
22835 88 : int ti_options = TABLE_INSERT_SKIP_FSM;
22836 : BulkInsertState bistate; /* state of bulk inserts for partition */
22837 : TupleTableSlot *dstslot;
22838 :
22839 : /* Find the work queue entry for the new partition table: newPartRel. */
22840 88 : tab = ATGetQueueEntry(wqueue, newPartRel);
22841 :
22842 : /* Generate the constraint and default execution states. */
22843 88 : estate = CreateExecutorState();
22844 :
22845 88 : buildExpressionExecutionStates(tab, newPartRel, estate);
22846 :
22847 88 : mycid = GetCurrentCommandId(true);
22848 :
22849 : /* Prepare a BulkInsertState for table_tuple_insert. */
22850 88 : bistate = GetBulkInsertState();
22851 :
22852 : /* Create the necessary tuple slot. */
22853 88 : dstslot = table_slot_create(newPartRel, NULL);
22854 :
22855 380 : foreach_oid(merging_oid, mergingPartitions)
22856 : {
22857 : ExprContext *econtext;
22858 : TupleTableSlot *srcslot;
22859 : TupleConversionMap *tuple_map;
22860 : TableScanDesc scan;
22861 : MemoryContext oldCxt;
22862 : Snapshot snapshot;
22863 : Relation mergingPartition;
22864 :
22865 204 : econtext = GetPerTupleExprContext(estate);
22866 :
22867 : /*
22868 : * Partition is already locked in the transformPartitionCmdForMerge
22869 : * function.
22870 : */
22871 204 : mergingPartition = table_open(merging_oid, NoLock);
22872 :
22873 : /* Create a source tuple slot for the partition being merged. */
22874 204 : srcslot = table_slot_create(mergingPartition, NULL);
22875 :
22876 : /*
22877 : * Map computing for moving attributes of the merged partition to the
22878 : * new partition.
22879 : */
22880 204 : tuple_map = convert_tuples_by_name(RelationGetDescr(mergingPartition),
22881 : RelationGetDescr(newPartRel));
22882 :
22883 : /* Scan through the rows. */
22884 204 : snapshot = RegisterSnapshot(GetLatestSnapshot());
22885 204 : scan = table_beginscan(mergingPartition, snapshot, 0, NULL);
22886 :
22887 : /*
22888 : * Switch to per-tuple memory context and reset it for each tuple
22889 : * produced, so we don't leak memory.
22890 : */
22891 204 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
22892 :
22893 445 : while (table_scan_getnextslot(scan, ForwardScanDirection, srcslot))
22894 : {
22895 : TupleTableSlot *insertslot;
22896 :
22897 241 : CHECK_FOR_INTERRUPTS();
22898 :
22899 241 : if (tuple_map)
22900 : {
22901 : /* Need to use a map to copy attributes. */
22902 28 : insertslot = execute_attr_map_slot(tuple_map->attrMap, srcslot, dstslot);
22903 : }
22904 : else
22905 : {
22906 213 : slot_getallattrs(srcslot);
22907 :
22908 : /* Copy attributes directly. */
22909 213 : insertslot = dstslot;
22910 :
22911 213 : ExecClearTuple(insertslot);
22912 :
22913 213 : memcpy(insertslot->tts_values, srcslot->tts_values,
22914 213 : sizeof(Datum) * srcslot->tts_nvalid);
22915 213 : memcpy(insertslot->tts_isnull, srcslot->tts_isnull,
22916 213 : sizeof(bool) * srcslot->tts_nvalid);
22917 :
22918 213 : ExecStoreVirtualTuple(insertslot);
22919 : }
22920 :
22921 : /*
22922 : * Constraints and GENERATED expressions might reference the
22923 : * tableoid column, so fill tts_tableOid with the desired value.
22924 : * (We must do this each time, because it gets overwritten with
22925 : * newrel's OID during storing.)
22926 : */
22927 241 : insertslot->tts_tableOid = RelationGetRelid(newPartRel);
22928 :
22929 : /*
22930 : * Now, evaluate any generated expressions whose inputs come from
22931 : * the new tuple. We assume these columns won't reference each
22932 : * other, so that there's no ordering dependency.
22933 : */
22934 241 : evaluateGeneratedExpressionsAndCheckConstraints(tab, newPartRel,
22935 : insertslot, econtext);
22936 :
22937 : /* Write the tuple out to the new relation. */
22938 241 : table_tuple_insert(newPartRel, insertslot, mycid,
22939 : ti_options, bistate);
22940 :
22941 241 : ResetExprContext(econtext);
22942 : }
22943 :
22944 204 : MemoryContextSwitchTo(oldCxt);
22945 204 : table_endscan(scan);
22946 204 : UnregisterSnapshot(snapshot);
22947 :
22948 204 : if (tuple_map)
22949 20 : free_conversion_map(tuple_map);
22950 :
22951 204 : ExecDropSingleTupleTableSlot(srcslot);
22952 204 : table_close(mergingPartition, NoLock);
22953 : }
22954 :
22955 88 : FreeExecutorState(estate);
22956 88 : ExecDropSingleTupleTableSlot(dstslot);
22957 88 : FreeBulkInsertState(bistate);
22958 :
22959 88 : table_finish_bulk_insert(newPartRel, ti_options);
22960 :
22961 : /*
22962 : * We don't need to process this newPartRel since we already processed it
22963 : * here, so delete the ALTER TABLE queue for it.
22964 : */
22965 176 : foreach(ltab, *wqueue)
22966 : {
22967 176 : tab = (AlteredTableInfo *) lfirst(ltab);
22968 176 : if (tab->relid == RelationGetRelid(newPartRel))
22969 : {
22970 88 : *wqueue = list_delete_cell(*wqueue, ltab);
22971 88 : break;
22972 : }
22973 : }
22974 88 : }
22975 :
22976 : /*
22977 : * detachPartitionTable: detach partition "child_rel" from partitioned table
22978 : * "parent_rel" with default partition identifier "defaultPartOid"
22979 : */
22980 : static void
22981 368 : detachPartitionTable(Relation parent_rel, Relation child_rel, Oid defaultPartOid)
22982 : {
22983 : /* Remove the pg_inherits row first. */
22984 368 : RemoveInheritance(child_rel, parent_rel, false);
22985 :
22986 : /*
22987 : * Detaching the partition might involve TOAST table access, so ensure we
22988 : * have a valid snapshot.
22989 : */
22990 368 : PushActiveSnapshot(GetTransactionSnapshot());
22991 :
22992 : /* Do the final part of detaching. */
22993 368 : DetachPartitionFinalize(parent_rel, child_rel, false, defaultPartOid);
22994 :
22995 368 : PopActiveSnapshot();
22996 368 : }
22997 :
22998 : /*
22999 : * ALTER TABLE <name> MERGE PARTITIONS <partition-list> INTO <partition-name>
23000 : */
23001 : static void
23002 116 : ATExecMergePartitions(List **wqueue, AlteredTableInfo *tab, Relation rel,
23003 : PartitionCmd *cmd, AlterTableUtilityContext *context)
23004 : {
23005 : Relation newPartRel;
23006 116 : List *mergingPartitions = NIL;
23007 : Oid defaultPartOid;
23008 : Oid existingRelid;
23009 116 : Oid ownerId = InvalidOid;
23010 : Oid save_userid;
23011 : int save_sec_context;
23012 : int save_nestlevel;
23013 :
23014 : /*
23015 : * Check ownership of merged partitions - partitions with different owners
23016 : * cannot be merged. Also, collect the OIDs of these partitions during the
23017 : * check.
23018 : */
23019 488 : foreach_node(RangeVar, name, cmd->partlist)
23020 : {
23021 : Relation mergingPartition;
23022 :
23023 : /*
23024 : * We are going to detach and remove this partition. We already took
23025 : * AccessExclusiveLock lock on transformPartitionCmdForMerge, so here,
23026 : * NoLock is fine.
23027 : */
23028 264 : mergingPartition = table_openrv_extended(name, NoLock, false);
23029 : Assert(CheckRelationLockedByMe(mergingPartition, AccessExclusiveLock, false));
23030 :
23031 264 : if (OidIsValid(ownerId))
23032 : {
23033 : /* Do the partitions being merged have different owners? */
23034 148 : if (ownerId != mergingPartition->rd_rel->relowner)
23035 4 : ereport(ERROR,
23036 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
23037 : errmsg("partitions being merged have different owners"));
23038 : }
23039 : else
23040 116 : ownerId = mergingPartition->rd_rel->relowner;
23041 :
23042 : /* Store the next merging partition into the list. */
23043 260 : mergingPartitions = lappend_oid(mergingPartitions,
23044 : RelationGetRelid(mergingPartition));
23045 :
23046 260 : table_close(mergingPartition, NoLock);
23047 : }
23048 :
23049 : /* Look up the existing relation by the new partition name. */
23050 112 : RangeVarGetAndCheckCreationNamespace(cmd->name, NoLock, &existingRelid);
23051 :
23052 : /*
23053 : * Check if this name is already taken. This helps us to detect the
23054 : * situation when one of the merging partitions has the same name as the
23055 : * new partition. Otherwise, this would fail later on anyway, but
23056 : * catching this here allows us to emit a nicer error message.
23057 : */
23058 112 : if (OidIsValid(existingRelid))
23059 : {
23060 17 : if (list_member_oid(mergingPartitions, existingRelid))
23061 : {
23062 : /*
23063 : * The new partition has the same name as one of the merging
23064 : * partitions.
23065 : */
23066 : char tmpRelName[NAMEDATALEN];
23067 :
23068 : /* Generate a temporary name. */
23069 13 : sprintf(tmpRelName, "merge-%u-%X-tmp", RelationGetRelid(rel), MyProcPid);
23070 :
23071 : /*
23072 : * Rename the existing partition with a temporary name, leaving it
23073 : * free for the new partition. We don't need to care about this
23074 : * in the future because we're going to eventually drop the
23075 : * existing partition anyway.
23076 : */
23077 13 : RenameRelationInternal(existingRelid, tmpRelName, true, false);
23078 :
23079 : /*
23080 : * We must bump the command counter to make the new partition
23081 : * tuple visible for rename.
23082 : */
23083 13 : CommandCounterIncrement();
23084 : }
23085 : else
23086 : {
23087 4 : ereport(ERROR,
23088 : errcode(ERRCODE_DUPLICATE_TABLE),
23089 : errmsg("relation \"%s\" already exists", cmd->name->relname));
23090 : }
23091 : }
23092 :
23093 : defaultPartOid =
23094 108 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
23095 :
23096 : /* Detach all merging partitions. */
23097 460 : foreach_oid(mergingPartitionOid, mergingPartitions)
23098 : {
23099 : Relation child_rel;
23100 :
23101 244 : child_rel = table_open(mergingPartitionOid, NoLock);
23102 :
23103 244 : detachPartitionTable(rel, child_rel, defaultPartOid);
23104 :
23105 244 : table_close(child_rel, NoLock);
23106 : }
23107 :
23108 : /*
23109 : * Perform a preliminary check to determine whether it's safe to drop all
23110 : * merging partitions before we actually do so later. After merging rows
23111 : * into the new partitions via MergePartitionsMoveRows, all old partitions
23112 : * need to be dropped. However, since the drop behavior is DROP_RESTRICT
23113 : * and the merge process (MergePartitionsMoveRows) can be time-consuming,
23114 : * performing an early check on the drop eligibility of old partitions is
23115 : * preferable.
23116 : */
23117 448 : foreach_oid(mergingPartitionOid, mergingPartitions)
23118 : {
23119 : ObjectAddress object;
23120 :
23121 : /* Get oid of the later to be dropped relation. */
23122 240 : object.objectId = mergingPartitionOid;
23123 240 : object.classId = RelationRelationId;
23124 240 : object.objectSubId = 0;
23125 :
23126 240 : performDeletionCheck(&object, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
23127 : }
23128 :
23129 : /*
23130 : * Create a table for the new partition, using the partitioned table as a
23131 : * model.
23132 : */
23133 : Assert(OidIsValid(ownerId));
23134 104 : newPartRel = createPartitionTable(wqueue, cmd->name, rel, ownerId);
23135 :
23136 : /*
23137 : * Switch to the table owner's userid, so that any index functions are run
23138 : * as that user. Also, lockdown security-restricted operations and
23139 : * arrange to make GUC variable changes local to this command.
23140 : *
23141 : * Need to do it after determining the namespace in the
23142 : * createPartitionTable() call.
23143 : */
23144 88 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
23145 88 : SetUserIdAndSecContext(ownerId,
23146 : save_sec_context | SECURITY_RESTRICTED_OPERATION);
23147 88 : save_nestlevel = NewGUCNestLevel();
23148 88 : RestrictSearchPath();
23149 :
23150 : /* Copy data from merged partitions to the new partition. */
23151 88 : MergePartitionsMoveRows(wqueue, mergingPartitions, newPartRel);
23152 :
23153 : /* Drop the current partitions before attaching the new one. */
23154 380 : foreach_oid(mergingPartitionOid, mergingPartitions)
23155 : {
23156 : ObjectAddress object;
23157 :
23158 204 : object.objectId = mergingPartitionOid;
23159 204 : object.classId = RelationRelationId;
23160 204 : object.objectSubId = 0;
23161 :
23162 204 : performDeletion(&object, DROP_RESTRICT, 0);
23163 : }
23164 :
23165 88 : list_free(mergingPartitions);
23166 :
23167 : /*
23168 : * Attach a new partition to the partitioned table. wqueue = NULL:
23169 : * verification for each cloned constraint is not needed.
23170 : */
23171 88 : attachPartitionTable(NULL, rel, newPartRel, cmd->bound);
23172 :
23173 : /* Keep the lock until commit. */
23174 88 : table_close(newPartRel, NoLock);
23175 :
23176 : /* Roll back any GUC changes executed by index functions. */
23177 88 : AtEOXact_GUC(false, save_nestlevel);
23178 :
23179 : /* Restore the userid and security context. */
23180 88 : SetUserIdAndSecContext(save_userid, save_sec_context);
23181 88 : }
23182 :
23183 : /*
23184 : * Struct with the context of the new partition for inserting rows from the
23185 : * split partition.
23186 : */
23187 : typedef struct SplitPartitionContext
23188 : {
23189 : ExprState *partqualstate; /* expression for checking a slot for a
23190 : * partition (NULL for DEFAULT partition) */
23191 : BulkInsertState bistate; /* state of bulk inserts for partition */
23192 : TupleTableSlot *dstslot; /* slot for inserting row into partition */
23193 : AlteredTableInfo *tab; /* structure with generated column expressions
23194 : * and check constraint expressions. */
23195 : Relation partRel; /* relation for partition */
23196 : } SplitPartitionContext;
23197 :
23198 : /*
23199 : * createSplitPartitionContext: create context for partition and fill it
23200 : */
23201 : static SplitPartitionContext *
23202 332 : createSplitPartitionContext(Relation partRel)
23203 : {
23204 : SplitPartitionContext *pc;
23205 :
23206 332 : pc = palloc0_object(SplitPartitionContext);
23207 332 : pc->partRel = partRel;
23208 :
23209 : /*
23210 : * Prepare a BulkInsertState for table_tuple_insert. The FSM is empty, so
23211 : * don't bother using it.
23212 : */
23213 332 : pc->bistate = GetBulkInsertState();
23214 :
23215 : /* Create a destination tuple slot for the new partition. */
23216 332 : pc->dstslot = table_slot_create(pc->partRel, NULL);
23217 :
23218 332 : return pc;
23219 : }
23220 :
23221 : /*
23222 : * deleteSplitPartitionContext: delete context for partition
23223 : */
23224 : static void
23225 332 : deleteSplitPartitionContext(SplitPartitionContext *pc, List **wqueue, int ti_options)
23226 : {
23227 : ListCell *ltab;
23228 :
23229 332 : ExecDropSingleTupleTableSlot(pc->dstslot);
23230 332 : FreeBulkInsertState(pc->bistate);
23231 :
23232 332 : table_finish_bulk_insert(pc->partRel, ti_options);
23233 :
23234 : /*
23235 : * We don't need to process this pc->partRel so delete the ALTER TABLE
23236 : * queue of it.
23237 : */
23238 664 : foreach(ltab, *wqueue)
23239 : {
23240 664 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
23241 :
23242 664 : if (tab->relid == RelationGetRelid(pc->partRel))
23243 : {
23244 332 : *wqueue = list_delete_cell(*wqueue, ltab);
23245 332 : break;
23246 : }
23247 : }
23248 :
23249 332 : pfree(pc);
23250 332 : }
23251 :
23252 : /*
23253 : * SplitPartitionMoveRows: scan split partition (splitRel) of partitioned table
23254 : * (rel) and move rows into new partitions.
23255 : *
23256 : * New partitions description:
23257 : * partlist: list of pointers to SinglePartitionSpec structures. It contains
23258 : * the partition specification details for all new partitions.
23259 : * newPartRels: list of Relations, new partitions created in
23260 : * ATExecSplitPartition.
23261 : */
23262 : static void
23263 120 : SplitPartitionMoveRows(List **wqueue, Relation rel, Relation splitRel,
23264 : List *partlist, List *newPartRels)
23265 : {
23266 : /* The FSM is empty, so don't bother using it. */
23267 120 : int ti_options = TABLE_INSERT_SKIP_FSM;
23268 : CommandId mycid;
23269 : EState *estate;
23270 : ListCell *listptr,
23271 : *listptr2;
23272 : TupleTableSlot *srcslot;
23273 : ExprContext *econtext;
23274 : TableScanDesc scan;
23275 : Snapshot snapshot;
23276 : MemoryContext oldCxt;
23277 120 : List *partContexts = NIL;
23278 : TupleConversionMap *tuple_map;
23279 120 : SplitPartitionContext *defaultPartCtx = NULL,
23280 : *pc;
23281 :
23282 120 : mycid = GetCurrentCommandId(true);
23283 :
23284 120 : estate = CreateExecutorState();
23285 :
23286 452 : forboth(listptr, partlist, listptr2, newPartRels)
23287 : {
23288 332 : SinglePartitionSpec *sps = (SinglePartitionSpec *) lfirst(listptr);
23289 :
23290 332 : pc = createSplitPartitionContext((Relation) lfirst(listptr2));
23291 :
23292 : /* Find the work queue entry for the new partition table: newPartRel. */
23293 332 : pc->tab = ATGetQueueEntry(wqueue, pc->partRel);
23294 :
23295 332 : buildExpressionExecutionStates(pc->tab, pc->partRel, estate);
23296 :
23297 332 : if (sps->bound->is_default)
23298 : {
23299 : /*
23300 : * We should not create a structure to check the partition
23301 : * constraint for the new DEFAULT partition.
23302 : */
23303 28 : defaultPartCtx = pc;
23304 : }
23305 : else
23306 : {
23307 : List *partConstraint;
23308 :
23309 : /* Build expression execution states for partition check quals. */
23310 304 : partConstraint = get_qual_from_partbound(rel, sps->bound);
23311 : partConstraint =
23312 304 : (List *) eval_const_expressions(NULL,
23313 : (Node *) partConstraint);
23314 : /* Make a boolean expression for ExecCheck(). */
23315 304 : partConstraint = list_make1(make_ands_explicit(partConstraint));
23316 :
23317 : /*
23318 : * Map the vars in the constraint expression from rel's attnos to
23319 : * splitRel's.
23320 : */
23321 304 : partConstraint = map_partition_varattnos(partConstraint,
23322 : 1, splitRel, rel);
23323 :
23324 304 : pc->partqualstate =
23325 304 : ExecPrepareExpr((Expr *) linitial(partConstraint), estate);
23326 : Assert(pc->partqualstate != NULL);
23327 : }
23328 :
23329 : /* Store partition context into a list. */
23330 332 : partContexts = lappend(partContexts, pc);
23331 : }
23332 :
23333 120 : econtext = GetPerTupleExprContext(estate);
23334 :
23335 : /* Create the necessary tuple slot. */
23336 120 : srcslot = table_slot_create(splitRel, NULL);
23337 :
23338 : /*
23339 : * Map computing for moving attributes of the split partition to the new
23340 : * partition (for the first new partition, but other new partitions can
23341 : * use the same map).
23342 : */
23343 120 : pc = (SplitPartitionContext *) lfirst(list_head(partContexts));
23344 120 : tuple_map = convert_tuples_by_name(RelationGetDescr(splitRel),
23345 120 : RelationGetDescr(pc->partRel));
23346 :
23347 : /* Scan through the rows. */
23348 120 : snapshot = RegisterSnapshot(GetLatestSnapshot());
23349 120 : scan = table_beginscan(splitRel, snapshot, 0, NULL);
23350 :
23351 : /*
23352 : * Switch to per-tuple memory context and reset it for each tuple
23353 : * produced, so we don't leak memory.
23354 : */
23355 120 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
23356 :
23357 543 : while (table_scan_getnextslot(scan, ForwardScanDirection, srcslot))
23358 : {
23359 423 : bool found = false;
23360 : TupleTableSlot *insertslot;
23361 :
23362 423 : CHECK_FOR_INTERRUPTS();
23363 :
23364 423 : econtext->ecxt_scantuple = srcslot;
23365 :
23366 : /* Search partition for the current slot, srcslot. */
23367 1138 : foreach(listptr, partContexts)
23368 : {
23369 1062 : pc = (SplitPartitionContext *) lfirst(listptr);
23370 :
23371 : /* skip DEFAULT partition */
23372 1062 : if (pc->partqualstate && ExecCheck(pc->partqualstate, econtext))
23373 : {
23374 347 : found = true;
23375 347 : break;
23376 : }
23377 : }
23378 423 : if (!found)
23379 : {
23380 : /* Use the DEFAULT partition if it exists. */
23381 76 : if (defaultPartCtx)
23382 76 : pc = defaultPartCtx;
23383 : else
23384 0 : ereport(ERROR,
23385 : errcode(ERRCODE_CHECK_VIOLATION),
23386 : errmsg("can not find partition for split partition row"),
23387 : errtable(splitRel));
23388 : }
23389 :
23390 423 : if (tuple_map)
23391 : {
23392 : /* Need to use a map to copy attributes. */
23393 16 : insertslot = execute_attr_map_slot(tuple_map->attrMap, srcslot, pc->dstslot);
23394 : }
23395 : else
23396 : {
23397 : /* Extract data from the old tuple. */
23398 407 : slot_getallattrs(srcslot);
23399 :
23400 : /* Copy attributes directly. */
23401 407 : insertslot = pc->dstslot;
23402 :
23403 407 : ExecClearTuple(insertslot);
23404 :
23405 407 : memcpy(insertslot->tts_values, srcslot->tts_values,
23406 407 : sizeof(Datum) * srcslot->tts_nvalid);
23407 407 : memcpy(insertslot->tts_isnull, srcslot->tts_isnull,
23408 407 : sizeof(bool) * srcslot->tts_nvalid);
23409 :
23410 407 : ExecStoreVirtualTuple(insertslot);
23411 : }
23412 :
23413 : /*
23414 : * Constraints and GENERATED expressions might reference the tableoid
23415 : * column, so fill tts_tableOid with the desired value. (We must do
23416 : * this each time, because it gets overwritten with newrel's OID
23417 : * during storing.)
23418 : */
23419 423 : insertslot->tts_tableOid = RelationGetRelid(pc->partRel);
23420 :
23421 : /*
23422 : * Now, evaluate any generated expressions whose inputs come from the
23423 : * new tuple. We assume these columns won't reference each other, so
23424 : * that there's no ordering dependency.
23425 : */
23426 423 : evaluateGeneratedExpressionsAndCheckConstraints(pc->tab, pc->partRel,
23427 : insertslot, econtext);
23428 :
23429 : /* Write the tuple out to the new relation. */
23430 423 : table_tuple_insert(pc->partRel, insertslot, mycid,
23431 423 : ti_options, pc->bistate);
23432 :
23433 423 : ResetExprContext(econtext);
23434 : }
23435 :
23436 120 : MemoryContextSwitchTo(oldCxt);
23437 :
23438 120 : table_endscan(scan);
23439 120 : UnregisterSnapshot(snapshot);
23440 :
23441 120 : if (tuple_map)
23442 4 : free_conversion_map(tuple_map);
23443 :
23444 120 : ExecDropSingleTupleTableSlot(srcslot);
23445 :
23446 120 : FreeExecutorState(estate);
23447 :
23448 572 : foreach_ptr(SplitPartitionContext, spc, partContexts)
23449 332 : deleteSplitPartitionContext(spc, wqueue, ti_options);
23450 120 : }
23451 :
23452 : /*
23453 : * ALTER TABLE <name> SPLIT PARTITION <partition-name> INTO <partition-list>
23454 : */
23455 : static void
23456 128 : ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
23457 : PartitionCmd *cmd, AlterTableUtilityContext *context)
23458 : {
23459 : Relation splitRel;
23460 : Oid splitRelOid;
23461 : ListCell *listptr,
23462 : *listptr2;
23463 128 : bool isSameName = false;
23464 : char tmpRelName[NAMEDATALEN];
23465 128 : List *newPartRels = NIL;
23466 : ObjectAddress object;
23467 : Oid defaultPartOid;
23468 : Oid save_userid;
23469 : int save_sec_context;
23470 : int save_nestlevel;
23471 :
23472 128 : defaultPartOid = get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
23473 :
23474 : /*
23475 : * Partition is already locked in the transformPartitionCmdForSplit
23476 : * function.
23477 : */
23478 128 : splitRel = table_openrv(cmd->name, NoLock);
23479 :
23480 128 : splitRelOid = RelationGetRelid(splitRel);
23481 :
23482 : /* Check descriptions of new partitions. */
23483 592 : foreach_node(SinglePartitionSpec, sps, cmd->partlist)
23484 : {
23485 : Oid existingRelid;
23486 :
23487 : /* Look up the existing relation by the new partition name. */
23488 344 : RangeVarGetAndCheckCreationNamespace(sps->name, NoLock, &existingRelid);
23489 :
23490 : /*
23491 : * This would fail later on anyway if the relation already exists. But
23492 : * by catching it here, we can emit a nicer error message.
23493 : */
23494 344 : if (existingRelid == splitRelOid && !isSameName)
23495 : /* One new partition can have the same name as a split partition. */
23496 29 : isSameName = true;
23497 315 : else if (OidIsValid(existingRelid))
23498 4 : ereport(ERROR,
23499 : errcode(ERRCODE_DUPLICATE_TABLE),
23500 : errmsg("relation \"%s\" already exists", sps->name->relname));
23501 : }
23502 :
23503 : /* Detach the split partition. */
23504 124 : detachPartitionTable(rel, splitRel, defaultPartOid);
23505 :
23506 : /*
23507 : * Perform a preliminary check to determine whether it's safe to drop the
23508 : * split partition before we actually do so later. After merging rows into
23509 : * the new partitions via SplitPartitionMoveRows, all old partitions need
23510 : * to be dropped. However, since the drop behavior is DROP_RESTRICT and
23511 : * the merge process (SplitPartitionMoveRows) can be time-consuming,
23512 : * performing an early check on the drop eligibility of old partitions is
23513 : * preferable.
23514 : */
23515 124 : object.objectId = splitRelOid;
23516 124 : object.classId = RelationRelationId;
23517 124 : object.objectSubId = 0;
23518 124 : performDeletionCheck(&object, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
23519 :
23520 : /*
23521 : * If a new partition has the same name as the split partition, then we
23522 : * should rename the split partition to reuse its name.
23523 : */
23524 124 : if (isSameName)
23525 : {
23526 : /*
23527 : * We must bump the command counter to make the split partition tuple
23528 : * visible for renaming.
23529 : */
23530 29 : CommandCounterIncrement();
23531 : /* Rename partition. */
23532 29 : sprintf(tmpRelName, "split-%u-%X-tmp", RelationGetRelid(rel), MyProcPid);
23533 29 : RenameRelationInternal(splitRelOid, tmpRelName, true, false);
23534 :
23535 : /*
23536 : * We must bump the command counter to make the split partition tuple
23537 : * visible after renaming.
23538 : */
23539 29 : CommandCounterIncrement();
23540 : }
23541 :
23542 : /* Create new partitions (like a split partition), without indexes. */
23543 576 : foreach_node(SinglePartitionSpec, sps, cmd->partlist)
23544 : {
23545 : Relation newPartRel;
23546 :
23547 336 : newPartRel = createPartitionTable(wqueue, sps->name, rel,
23548 336 : splitRel->rd_rel->relowner);
23549 332 : newPartRels = lappend(newPartRels, newPartRel);
23550 : }
23551 :
23552 : /*
23553 : * Switch to the table owner's userid, so that any index functions are run
23554 : * as that user. Also, lockdown security-restricted operations and
23555 : * arrange to make GUC variable changes local to this command.
23556 : *
23557 : * Need to do it after determining the namespace in the
23558 : * createPartitionTable() call.
23559 : */
23560 120 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
23561 120 : SetUserIdAndSecContext(splitRel->rd_rel->relowner,
23562 : save_sec_context | SECURITY_RESTRICTED_OPERATION);
23563 120 : save_nestlevel = NewGUCNestLevel();
23564 120 : RestrictSearchPath();
23565 :
23566 : /* Copy data from the split partition to the new partitions. */
23567 120 : SplitPartitionMoveRows(wqueue, rel, splitRel, cmd->partlist, newPartRels);
23568 : /* Keep the lock until commit. */
23569 120 : table_close(splitRel, NoLock);
23570 :
23571 : /* Attach new partitions to the partitioned table. */
23572 452 : forboth(listptr, cmd->partlist, listptr2, newPartRels)
23573 : {
23574 332 : SinglePartitionSpec *sps = (SinglePartitionSpec *) lfirst(listptr);
23575 332 : Relation newPartRel = (Relation) lfirst(listptr2);
23576 :
23577 : /*
23578 : * wqueue = NULL: verification for each cloned constraint is not
23579 : * needed.
23580 : */
23581 332 : attachPartitionTable(NULL, rel, newPartRel, sps->bound);
23582 : /* Keep the lock until commit. */
23583 332 : table_close(newPartRel, NoLock);
23584 : }
23585 :
23586 : /* Drop the split partition. */
23587 120 : object.classId = RelationRelationId;
23588 120 : object.objectId = splitRelOid;
23589 120 : object.objectSubId = 0;
23590 : /* Probably DROP_CASCADE is not needed. */
23591 120 : performDeletion(&object, DROP_RESTRICT, 0);
23592 :
23593 : /* Roll back any GUC changes executed by index functions. */
23594 120 : AtEOXact_GUC(false, save_nestlevel);
23595 :
23596 : /* Restore the userid and security context. */
23597 120 : SetUserIdAndSecContext(save_userid, save_sec_context);
23598 120 : }
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