Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * tablecmds.c
4 : * Commands for creating and altering table structures and settings
5 : *
6 : * Portions Copyright (c) 1996-2025, 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/xact.h"
29 : #include "access/xlog.h"
30 : #include "access/xloginsert.h"
31 : #include "catalog/catalog.h"
32 : #include "catalog/heap.h"
33 : #include "catalog/index.h"
34 : #include "catalog/namespace.h"
35 : #include "catalog/objectaccess.h"
36 : #include "catalog/partition.h"
37 : #include "catalog/pg_am.h"
38 : #include "catalog/pg_attrdef.h"
39 : #include "catalog/pg_collation.h"
40 : #include "catalog/pg_constraint.h"
41 : #include "catalog/pg_depend.h"
42 : #include "catalog/pg_foreign_table.h"
43 : #include "catalog/pg_inherits.h"
44 : #include "catalog/pg_largeobject.h"
45 : #include "catalog/pg_largeobject_metadata.h"
46 : #include "catalog/pg_namespace.h"
47 : #include "catalog/pg_opclass.h"
48 : #include "catalog/pg_policy.h"
49 : #include "catalog/pg_proc.h"
50 : #include "catalog/pg_publication_rel.h"
51 : #include "catalog/pg_rewrite.h"
52 : #include "catalog/pg_statistic_ext.h"
53 : #include "catalog/pg_tablespace.h"
54 : #include "catalog/pg_trigger.h"
55 : #include "catalog/pg_type.h"
56 : #include "catalog/storage.h"
57 : #include "catalog/storage_xlog.h"
58 : #include "catalog/toasting.h"
59 : #include "commands/cluster.h"
60 : #include "commands/comment.h"
61 : #include "commands/defrem.h"
62 : #include "commands/event_trigger.h"
63 : #include "commands/sequence.h"
64 : #include "commands/tablecmds.h"
65 : #include "commands/tablespace.h"
66 : #include "commands/trigger.h"
67 : #include "commands/typecmds.h"
68 : #include "commands/user.h"
69 : #include "commands/vacuum.h"
70 : #include "common/int.h"
71 : #include "executor/executor.h"
72 : #include "foreign/fdwapi.h"
73 : #include "foreign/foreign.h"
74 : #include "miscadmin.h"
75 : #include "nodes/makefuncs.h"
76 : #include "nodes/nodeFuncs.h"
77 : #include "nodes/parsenodes.h"
78 : #include "optimizer/optimizer.h"
79 : #include "parser/parse_coerce.h"
80 : #include "parser/parse_collate.h"
81 : #include "parser/parse_expr.h"
82 : #include "parser/parse_relation.h"
83 : #include "parser/parse_type.h"
84 : #include "parser/parse_utilcmd.h"
85 : #include "parser/parser.h"
86 : #include "partitioning/partbounds.h"
87 : #include "partitioning/partdesc.h"
88 : #include "pgstat.h"
89 : #include "rewrite/rewriteDefine.h"
90 : #include "rewrite/rewriteHandler.h"
91 : #include "rewrite/rewriteManip.h"
92 : #include "storage/bufmgr.h"
93 : #include "storage/lmgr.h"
94 : #include "storage/lock.h"
95 : #include "storage/predicate.h"
96 : #include "storage/smgr.h"
97 : #include "tcop/utility.h"
98 : #include "utils/acl.h"
99 : #include "utils/builtins.h"
100 : #include "utils/fmgroids.h"
101 : #include "utils/inval.h"
102 : #include "utils/lsyscache.h"
103 : #include "utils/memutils.h"
104 : #include "utils/partcache.h"
105 : #include "utils/relcache.h"
106 : #include "utils/ruleutils.h"
107 : #include "utils/snapmgr.h"
108 : #include "utils/syscache.h"
109 : #include "utils/timestamp.h"
110 : #include "utils/typcache.h"
111 : #include "utils/usercontext.h"
112 :
113 : /*
114 : * ON COMMIT action list
115 : */
116 : typedef struct OnCommitItem
117 : {
118 : Oid relid; /* relid of relation */
119 : OnCommitAction oncommit; /* what to do at end of xact */
120 :
121 : /*
122 : * If this entry was created during the current transaction,
123 : * creating_subid is the ID of the creating subxact; if created in a prior
124 : * transaction, creating_subid is zero. If deleted during the current
125 : * transaction, deleting_subid is the ID of the deleting subxact; if no
126 : * deletion request is pending, deleting_subid is zero.
127 : */
128 : SubTransactionId creating_subid;
129 : SubTransactionId deleting_subid;
130 : } OnCommitItem;
131 :
132 : static List *on_commits = NIL;
133 :
134 :
135 : /*
136 : * State information for ALTER TABLE
137 : *
138 : * The pending-work queue for an ALTER TABLE is a List of AlteredTableInfo
139 : * structs, one for each table modified by the operation (the named table
140 : * plus any child tables that are affected). We save lists of subcommands
141 : * to apply to this table (possibly modified by parse transformation steps);
142 : * these lists will be executed in Phase 2. If a Phase 3 step is needed,
143 : * necessary information is stored in the constraints and newvals lists.
144 : *
145 : * Phase 2 is divided into multiple passes; subcommands are executed in
146 : * a pass determined by subcommand type.
147 : */
148 :
149 : typedef enum AlterTablePass
150 : {
151 : AT_PASS_UNSET = -1, /* UNSET will cause ERROR */
152 : AT_PASS_DROP, /* DROP (all flavors) */
153 : AT_PASS_ALTER_TYPE, /* ALTER COLUMN TYPE */
154 : AT_PASS_ADD_COL, /* ADD COLUMN */
155 : AT_PASS_SET_EXPRESSION, /* ALTER SET EXPRESSION */
156 : AT_PASS_OLD_INDEX, /* re-add existing indexes */
157 : AT_PASS_OLD_CONSTR, /* re-add existing constraints */
158 : /* We could support a RENAME COLUMN pass here, but not currently used */
159 : AT_PASS_ADD_CONSTR, /* ADD constraints (initial examination) */
160 : AT_PASS_COL_ATTRS, /* set column attributes, eg NOT NULL */
161 : AT_PASS_ADD_INDEXCONSTR, /* ADD index-based constraints */
162 : AT_PASS_ADD_INDEX, /* ADD indexes */
163 : AT_PASS_ADD_OTHERCONSTR, /* ADD other constraints, defaults */
164 : AT_PASS_MISC, /* other stuff */
165 : } AlterTablePass;
166 :
167 : #define AT_NUM_PASSES (AT_PASS_MISC + 1)
168 :
169 : typedef struct AlteredTableInfo
170 : {
171 : /* Information saved before any work commences: */
172 : Oid relid; /* Relation to work on */
173 : char relkind; /* Its relkind */
174 : TupleDesc oldDesc; /* Pre-modification tuple descriptor */
175 :
176 : /*
177 : * Transiently set during Phase 2, normally set to NULL.
178 : *
179 : * ATRewriteCatalogs sets this when it starts, and closes when ATExecCmd
180 : * returns control. This can be exploited by ATExecCmd subroutines to
181 : * close/reopen across transaction boundaries.
182 : */
183 : Relation rel;
184 :
185 : /* Information saved by Phase 1 for Phase 2: */
186 : List *subcmds[AT_NUM_PASSES]; /* Lists of AlterTableCmd */
187 : /* Information saved by Phases 1/2 for Phase 3: */
188 : List *constraints; /* List of NewConstraint */
189 : List *newvals; /* List of NewColumnValue */
190 : List *afterStmts; /* List of utility command parsetrees */
191 : bool verify_new_notnull; /* T if we should recheck NOT NULL */
192 : int rewrite; /* Reason for forced rewrite, if any */
193 : bool chgAccessMethod; /* T if SET ACCESS METHOD is used */
194 : Oid newAccessMethod; /* new access method; 0 means no change,
195 : * if above is true */
196 : Oid newTableSpace; /* new tablespace; 0 means no change */
197 : bool chgPersistence; /* T if SET LOGGED/UNLOGGED is used */
198 : char newrelpersistence; /* if above is true */
199 : Expr *partition_constraint; /* for attach partition validation */
200 : /* true, if validating default due to some other attach/detach */
201 : bool validate_default;
202 : /* Objects to rebuild after completing ALTER TYPE operations */
203 : List *changedConstraintOids; /* OIDs of constraints to rebuild */
204 : List *changedConstraintDefs; /* string definitions of same */
205 : List *changedIndexOids; /* OIDs of indexes to rebuild */
206 : List *changedIndexDefs; /* string definitions of same */
207 : char *replicaIdentityIndex; /* index to reset as REPLICA IDENTITY */
208 : char *clusterOnIndex; /* index to use for CLUSTER */
209 : List *changedStatisticsOids; /* OIDs of statistics to rebuild */
210 : List *changedStatisticsDefs; /* string definitions of same */
211 : } AlteredTableInfo;
212 :
213 : /* Struct describing one new constraint to check in Phase 3 scan */
214 : /* Note: new not-null constraints are handled elsewhere */
215 : typedef struct NewConstraint
216 : {
217 : char *name; /* Constraint name, or NULL if none */
218 : ConstrType contype; /* CHECK or FOREIGN */
219 : Oid refrelid; /* PK rel, if FOREIGN */
220 : Oid refindid; /* OID of PK's index, if FOREIGN */
221 : bool conwithperiod; /* Whether the new FOREIGN KEY uses PERIOD */
222 : Oid conid; /* OID of pg_constraint entry, if FOREIGN */
223 : Node *qual; /* Check expr or CONSTR_FOREIGN Constraint */
224 : ExprState *qualstate; /* Execution state for CHECK expr */
225 : } NewConstraint;
226 :
227 : /*
228 : * Struct describing one new column value that needs to be computed during
229 : * Phase 3 copy (this could be either a new column with a non-null default, or
230 : * a column that we're changing the type of). Columns without such an entry
231 : * are just copied from the old table during ATRewriteTable. Note that the
232 : * expr is an expression over *old* table values, except when is_generated
233 : * is true; then it is an expression over columns of the *new* tuple.
234 : */
235 : typedef struct NewColumnValue
236 : {
237 : AttrNumber attnum; /* which column */
238 : Expr *expr; /* expression to compute */
239 : ExprState *exprstate; /* execution state */
240 : bool is_generated; /* is it a GENERATED expression? */
241 : } NewColumnValue;
242 :
243 : /*
244 : * Error-reporting support for RemoveRelations
245 : */
246 : struct dropmsgstrings
247 : {
248 : char kind;
249 : int nonexistent_code;
250 : const char *nonexistent_msg;
251 : const char *skipping_msg;
252 : const char *nota_msg;
253 : const char *drophint_msg;
254 : };
255 :
256 : static const struct dropmsgstrings dropmsgstringarray[] = {
257 : {RELKIND_RELATION,
258 : ERRCODE_UNDEFINED_TABLE,
259 : gettext_noop("table \"%s\" does not exist"),
260 : gettext_noop("table \"%s\" does not exist, skipping"),
261 : gettext_noop("\"%s\" is not a table"),
262 : gettext_noop("Use DROP TABLE to remove a table.")},
263 : {RELKIND_SEQUENCE,
264 : ERRCODE_UNDEFINED_TABLE,
265 : gettext_noop("sequence \"%s\" does not exist"),
266 : gettext_noop("sequence \"%s\" does not exist, skipping"),
267 : gettext_noop("\"%s\" is not a sequence"),
268 : gettext_noop("Use DROP SEQUENCE to remove a sequence.")},
269 : {RELKIND_VIEW,
270 : ERRCODE_UNDEFINED_TABLE,
271 : gettext_noop("view \"%s\" does not exist"),
272 : gettext_noop("view \"%s\" does not exist, skipping"),
273 : gettext_noop("\"%s\" is not a view"),
274 : gettext_noop("Use DROP VIEW to remove a view.")},
275 : {RELKIND_MATVIEW,
276 : ERRCODE_UNDEFINED_TABLE,
277 : gettext_noop("materialized view \"%s\" does not exist"),
278 : gettext_noop("materialized view \"%s\" does not exist, skipping"),
279 : gettext_noop("\"%s\" is not a materialized view"),
280 : gettext_noop("Use DROP MATERIALIZED VIEW to remove a materialized view.")},
281 : {RELKIND_INDEX,
282 : ERRCODE_UNDEFINED_OBJECT,
283 : gettext_noop("index \"%s\" does not exist"),
284 : gettext_noop("index \"%s\" does not exist, skipping"),
285 : gettext_noop("\"%s\" is not an index"),
286 : gettext_noop("Use DROP INDEX to remove an index.")},
287 : {RELKIND_COMPOSITE_TYPE,
288 : ERRCODE_UNDEFINED_OBJECT,
289 : gettext_noop("type \"%s\" does not exist"),
290 : gettext_noop("type \"%s\" does not exist, skipping"),
291 : gettext_noop("\"%s\" is not a type"),
292 : gettext_noop("Use DROP TYPE to remove a type.")},
293 : {RELKIND_FOREIGN_TABLE,
294 : ERRCODE_UNDEFINED_OBJECT,
295 : gettext_noop("foreign table \"%s\" does not exist"),
296 : gettext_noop("foreign table \"%s\" does not exist, skipping"),
297 : gettext_noop("\"%s\" is not a foreign table"),
298 : gettext_noop("Use DROP FOREIGN TABLE to remove a foreign table.")},
299 : {RELKIND_PARTITIONED_TABLE,
300 : ERRCODE_UNDEFINED_TABLE,
301 : gettext_noop("table \"%s\" does not exist"),
302 : gettext_noop("table \"%s\" does not exist, skipping"),
303 : gettext_noop("\"%s\" is not a table"),
304 : gettext_noop("Use DROP TABLE to remove a table.")},
305 : {RELKIND_PARTITIONED_INDEX,
306 : ERRCODE_UNDEFINED_OBJECT,
307 : gettext_noop("index \"%s\" does not exist"),
308 : gettext_noop("index \"%s\" does not exist, skipping"),
309 : gettext_noop("\"%s\" is not an index"),
310 : gettext_noop("Use DROP INDEX to remove an index.")},
311 : {'\0', 0, NULL, NULL, NULL, NULL}
312 : };
313 :
314 : /* communication between RemoveRelations and RangeVarCallbackForDropRelation */
315 : struct DropRelationCallbackState
316 : {
317 : /* These fields are set by RemoveRelations: */
318 : char expected_relkind;
319 : LOCKMODE heap_lockmode;
320 : /* These fields are state to track which subsidiary locks are held: */
321 : Oid heapOid;
322 : Oid partParentOid;
323 : /* These fields are passed back by RangeVarCallbackForDropRelation: */
324 : char actual_relkind;
325 : char actual_relpersistence;
326 : };
327 :
328 : /* Alter table target-type flags for ATSimplePermissions */
329 : #define ATT_TABLE 0x0001
330 : #define ATT_VIEW 0x0002
331 : #define ATT_MATVIEW 0x0004
332 : #define ATT_INDEX 0x0008
333 : #define ATT_COMPOSITE_TYPE 0x0010
334 : #define ATT_FOREIGN_TABLE 0x0020
335 : #define ATT_PARTITIONED_INDEX 0x0040
336 : #define ATT_SEQUENCE 0x0080
337 : #define ATT_PARTITIONED_TABLE 0x0100
338 :
339 : /*
340 : * ForeignTruncateInfo
341 : *
342 : * Information related to truncation of foreign tables. This is used for
343 : * the elements in a hash table. It uses the server OID as lookup key,
344 : * and includes a per-server list of all foreign tables involved in the
345 : * truncation.
346 : */
347 : typedef struct ForeignTruncateInfo
348 : {
349 : Oid serverid;
350 : List *rels;
351 : } ForeignTruncateInfo;
352 :
353 : /* Partial or complete FK creation in addFkConstraint() */
354 : typedef enum addFkConstraintSides
355 : {
356 : addFkReferencedSide,
357 : addFkReferencingSide,
358 : addFkBothSides,
359 : } addFkConstraintSides;
360 :
361 : /*
362 : * Partition tables are expected to be dropped when the parent partitioned
363 : * table gets dropped. Hence for partitioning we use AUTO dependency.
364 : * Otherwise, for regular inheritance use NORMAL dependency.
365 : */
366 : #define child_dependency_type(child_is_partition) \
367 : ((child_is_partition) ? DEPENDENCY_AUTO : DEPENDENCY_NORMAL)
368 :
369 : static void truncate_check_rel(Oid relid, Form_pg_class reltuple);
370 : static void truncate_check_perms(Oid relid, Form_pg_class reltuple);
371 : static void truncate_check_activity(Relation rel);
372 : static void RangeVarCallbackForTruncate(const RangeVar *relation,
373 : Oid relId, Oid oldRelId, void *arg);
374 : static List *MergeAttributes(List *columns, const List *supers, char relpersistence,
375 : bool is_partition, List **supconstr,
376 : List **supnotnulls);
377 : static List *MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced);
378 : static void MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef);
379 : static ColumnDef *MergeInheritedAttribute(List *inh_columns, int exist_attno, const ColumnDef *newdef);
380 : static void MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition);
381 : static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel);
382 : static void StoreCatalogInheritance(Oid relationId, List *supers,
383 : bool child_is_partition);
384 : static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
385 : int32 seqNumber, Relation inhRelation,
386 : bool child_is_partition);
387 : static int findAttrByName(const char *attributeName, const List *columns);
388 : static void AlterIndexNamespaces(Relation classRel, Relation rel,
389 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved);
390 : static void AlterSeqNamespaces(Relation classRel, Relation rel,
391 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
392 : LOCKMODE lockmode);
393 : static ObjectAddress ATExecAlterConstraint(List **wqueue, Relation rel,
394 : ATAlterConstraint *cmdcon,
395 : bool recurse, LOCKMODE lockmode);
396 : static bool ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon, Relation conrel,
397 : Relation tgrel, Relation rel, HeapTuple contuple,
398 : bool recurse, LOCKMODE lockmode);
399 : static bool ATExecAlterConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
400 : Relation conrel, Relation tgrel,
401 : Oid fkrelid, Oid pkrelid,
402 : HeapTuple contuple, LOCKMODE lockmode,
403 : Oid ReferencedParentDelTrigger,
404 : Oid ReferencedParentUpdTrigger,
405 : Oid ReferencingParentInsTrigger,
406 : Oid ReferencingParentUpdTrigger);
407 : static bool ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
408 : Relation conrel, Relation tgrel, Relation rel,
409 : HeapTuple contuple, bool recurse,
410 : List **otherrelids, LOCKMODE lockmode);
411 : static bool ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
412 : Relation conrel, Relation rel,
413 : HeapTuple contuple, LOCKMODE lockmode);
414 : static void AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
415 : bool deferrable, bool initdeferred,
416 : List **otherrelids);
417 : static void AlterConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
418 : Relation conrel, Relation tgrel,
419 : Oid fkrelid, Oid pkrelid,
420 : HeapTuple contuple, LOCKMODE lockmode,
421 : Oid ReferencedParentDelTrigger,
422 : Oid ReferencedParentUpdTrigger,
423 : Oid ReferencingParentInsTrigger,
424 : Oid ReferencingParentUpdTrigger);
425 : static void AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
426 : Relation conrel, Relation tgrel, Relation rel,
427 : HeapTuple contuple, bool recurse,
428 : List **otherrelids, LOCKMODE lockmode);
429 : static void AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
430 : HeapTuple contuple);
431 : static ObjectAddress ATExecValidateConstraint(List **wqueue,
432 : Relation rel, char *constrName,
433 : bool recurse, bool recursing, LOCKMODE lockmode);
434 : static void QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
435 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode);
436 : static void QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
437 : char *constrName, HeapTuple contuple,
438 : bool recurse, bool recursing, LOCKMODE lockmode);
439 : static void QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
440 : HeapTuple contuple, bool recurse, bool recursing,
441 : LOCKMODE lockmode);
442 : static int transformColumnNameList(Oid relId, List *colList,
443 : int16 *attnums, Oid *atttypids, Oid *attcollids);
444 : static int transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
445 : List **attnamelist,
446 : int16 *attnums, Oid *atttypids, Oid *attcollids,
447 : Oid *opclasses, bool *pk_has_without_overlaps);
448 : static Oid transformFkeyCheckAttrs(Relation pkrel,
449 : int numattrs, int16 *attnums,
450 : bool with_period, Oid *opclasses,
451 : bool *pk_has_without_overlaps);
452 : static void checkFkeyPermissions(Relation rel, int16 *attnums, int natts);
453 : static CoercionPathType findFkeyCast(Oid targetTypeId, Oid sourceTypeId,
454 : Oid *funcid);
455 : static void validateForeignKeyConstraint(char *conname,
456 : Relation rel, Relation pkrel,
457 : Oid pkindOid, Oid constraintOid, bool hasperiod);
458 : static void CheckAlterTableIsSafe(Relation rel);
459 : static void ATController(AlterTableStmt *parsetree,
460 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
461 : AlterTableUtilityContext *context);
462 : static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
463 : bool recurse, bool recursing, LOCKMODE lockmode,
464 : AlterTableUtilityContext *context);
465 : static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
466 : AlterTableUtilityContext *context);
467 : static void ATExecCmd(List **wqueue, AlteredTableInfo *tab,
468 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
469 : AlterTableUtilityContext *context);
470 : static AlterTableCmd *ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab,
471 : Relation rel, AlterTableCmd *cmd,
472 : bool recurse, LOCKMODE lockmode,
473 : AlterTablePass cur_pass,
474 : AlterTableUtilityContext *context);
475 : static void ATRewriteTables(AlterTableStmt *parsetree,
476 : List **wqueue, LOCKMODE lockmode,
477 : AlterTableUtilityContext *context);
478 : static void ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap);
479 : static AlteredTableInfo *ATGetQueueEntry(List **wqueue, Relation rel);
480 : static void ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets);
481 : static void ATSimpleRecursion(List **wqueue, Relation rel,
482 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
483 : AlterTableUtilityContext *context);
484 : static void ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode);
485 : static void ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
486 : LOCKMODE lockmode,
487 : AlterTableUtilityContext *context);
488 : static List *find_typed_table_dependencies(Oid typeOid, const char *typeName,
489 : DropBehavior behavior);
490 : static void ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
491 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
492 : AlterTableUtilityContext *context);
493 : static ObjectAddress ATExecAddColumn(List **wqueue, AlteredTableInfo *tab,
494 : Relation rel, AlterTableCmd **cmd,
495 : bool recurse, bool recursing,
496 : LOCKMODE lockmode, AlterTablePass cur_pass,
497 : AlterTableUtilityContext *context);
498 : static bool check_for_column_name_collision(Relation rel, const char *colname,
499 : bool if_not_exists);
500 : static void add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid);
501 : static void add_column_collation_dependency(Oid relid, int32 attnum, Oid collid);
502 : static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
503 : LOCKMODE lockmode);
504 : static void set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
505 : bool is_valid, bool queue_validation);
506 : static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
507 : char *conName, char *colName,
508 : bool recurse, bool recursing,
509 : LOCKMODE lockmode);
510 : static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
511 : static bool ConstraintImpliedByRelConstraint(Relation scanrel,
512 : List *testConstraint, List *provenConstraint);
513 : static ObjectAddress ATExecColumnDefault(Relation rel, const char *colName,
514 : Node *newDefault, LOCKMODE lockmode);
515 : static ObjectAddress ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
516 : Node *newDefault);
517 : static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,
518 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
519 : static ObjectAddress ATExecSetIdentity(Relation rel, const char *colName,
520 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
521 : static ObjectAddress ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
522 : bool recurse, bool recursing);
523 : static ObjectAddress ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
524 : Node *newExpr, LOCKMODE lockmode);
525 : static void ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode);
526 : static ObjectAddress ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode);
527 : static ObjectAddress ATExecSetStatistics(Relation rel, const char *colName, int16 colNum,
528 : Node *newValue, LOCKMODE lockmode);
529 : static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
530 : Node *options, bool isReset, LOCKMODE lockmode);
531 : static ObjectAddress ATExecSetStorage(Relation rel, const char *colName,
532 : Node *newValue, LOCKMODE lockmode);
533 : static void ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
534 : AlterTableCmd *cmd, LOCKMODE lockmode,
535 : AlterTableUtilityContext *context);
536 : static ObjectAddress ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
537 : DropBehavior behavior,
538 : bool recurse, bool recursing,
539 : bool missing_ok, LOCKMODE lockmode,
540 : ObjectAddresses *addrs);
541 : static void ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
542 : bool recurse, LOCKMODE lockmode,
543 : AlterTableUtilityContext *context);
544 : static void verifyNotNullPKCompatible(HeapTuple tuple, const char *colname);
545 : static ObjectAddress ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
546 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
547 : static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
548 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
549 : static ObjectAddress ATExecAddConstraint(List **wqueue,
550 : AlteredTableInfo *tab, Relation rel,
551 : Constraint *newConstraint, bool recurse, bool is_readd,
552 : LOCKMODE lockmode);
553 : static char *ChooseForeignKeyConstraintNameAddition(List *colnames);
554 : static ObjectAddress ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
555 : IndexStmt *stmt, LOCKMODE lockmode);
556 : static ObjectAddress ATAddCheckNNConstraint(List **wqueue,
557 : AlteredTableInfo *tab, Relation rel,
558 : Constraint *constr,
559 : bool recurse, bool recursing, bool is_readd,
560 : LOCKMODE lockmode);
561 : static ObjectAddress ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab,
562 : Relation rel, Constraint *fkconstraint,
563 : bool recurse, bool recursing,
564 : LOCKMODE lockmode);
565 : static int validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
566 : int numfksetcols, int16 *fksetcolsattnums,
567 : List *fksetcols);
568 : static ObjectAddress addFkConstraint(addFkConstraintSides fkside,
569 : char *constraintname,
570 : Constraint *fkconstraint, Relation rel,
571 : Relation pkrel, Oid indexOid,
572 : Oid parentConstr,
573 : int numfks, int16 *pkattnum, int16 *fkattnum,
574 : Oid *pfeqoperators, Oid *ppeqoperators,
575 : Oid *ffeqoperators, int numfkdelsetcols,
576 : int16 *fkdelsetcols, bool is_internal,
577 : bool with_period);
578 : static void addFkRecurseReferenced(Constraint *fkconstraint,
579 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
580 : int numfks, int16 *pkattnum, int16 *fkattnum,
581 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
582 : int numfkdelsetcols, int16 *fkdelsetcols,
583 : bool old_check_ok,
584 : Oid parentDelTrigger, Oid parentUpdTrigger,
585 : bool with_period);
586 : static void addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint,
587 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
588 : int numfks, int16 *pkattnum, int16 *fkattnum,
589 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
590 : int numfkdelsetcols, int16 *fkdelsetcols,
591 : bool old_check_ok, LOCKMODE lockmode,
592 : Oid parentInsTrigger, Oid parentUpdTrigger,
593 : bool with_period);
594 : static void CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
595 : Relation partitionRel);
596 : static void CloneFkReferenced(Relation parentRel, Relation partitionRel);
597 : static void CloneFkReferencing(List **wqueue, Relation parentRel,
598 : Relation partRel);
599 : static void createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
600 : Constraint *fkconstraint, Oid constraintOid,
601 : Oid indexOid,
602 : Oid parentInsTrigger, Oid parentUpdTrigger,
603 : Oid *insertTrigOid, Oid *updateTrigOid);
604 : static void createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid,
605 : Constraint *fkconstraint, Oid constraintOid,
606 : Oid indexOid,
607 : Oid parentDelTrigger, Oid parentUpdTrigger,
608 : Oid *deleteTrigOid, Oid *updateTrigOid);
609 : static bool tryAttachPartitionForeignKey(List **wqueue,
610 : ForeignKeyCacheInfo *fk,
611 : Relation partition,
612 : Oid parentConstrOid, int numfks,
613 : AttrNumber *mapped_conkey, AttrNumber *confkey,
614 : Oid *conpfeqop,
615 : Oid parentInsTrigger,
616 : Oid parentUpdTrigger,
617 : Relation trigrel);
618 : static void AttachPartitionForeignKey(List **wqueue, Relation partition,
619 : Oid partConstrOid, Oid parentConstrOid,
620 : Oid parentInsTrigger, Oid parentUpdTrigger,
621 : Relation trigrel);
622 : static void RemoveInheritedConstraint(Relation conrel, Relation trigrel,
623 : Oid conoid, Oid conrelid);
624 : static void DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid,
625 : Oid confrelid, Oid conrelid);
626 : static void GetForeignKeyActionTriggers(Relation trigrel,
627 : Oid conoid, Oid confrelid, Oid conrelid,
628 : Oid *deleteTriggerOid,
629 : Oid *updateTriggerOid);
630 : static void GetForeignKeyCheckTriggers(Relation trigrel,
631 : Oid conoid, Oid confrelid, Oid conrelid,
632 : Oid *insertTriggerOid,
633 : Oid *updateTriggerOid);
634 : static void ATExecDropConstraint(Relation rel, const char *constrName,
635 : DropBehavior behavior, bool recurse,
636 : bool missing_ok, LOCKMODE lockmode);
637 : static ObjectAddress dropconstraint_internal(Relation rel,
638 : HeapTuple constraintTup, DropBehavior behavior,
639 : bool recurse, bool recursing,
640 : bool missing_ok, LOCKMODE lockmode);
641 : static void ATPrepAlterColumnType(List **wqueue,
642 : AlteredTableInfo *tab, Relation rel,
643 : bool recurse, bool recursing,
644 : AlterTableCmd *cmd, LOCKMODE lockmode,
645 : AlterTableUtilityContext *context);
646 : static bool ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno);
647 : static ObjectAddress ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
648 : AlterTableCmd *cmd, LOCKMODE lockmode);
649 : static void RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
650 : Relation rel, AttrNumber attnum, const char *colName);
651 : static void RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab);
652 : static void RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab);
653 : static void RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab);
654 : static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab,
655 : LOCKMODE lockmode);
656 : static void ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId,
657 : char *cmd, List **wqueue, LOCKMODE lockmode,
658 : bool rewrite);
659 : static void RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass,
660 : Oid objid, Relation rel, List *domname,
661 : const char *conname);
662 : static void TryReuseIndex(Oid oldId, IndexStmt *stmt);
663 : static void TryReuseForeignKey(Oid oldId, Constraint *con);
664 : static ObjectAddress ATExecAlterColumnGenericOptions(Relation rel, const char *colName,
665 : List *options, LOCKMODE lockmode);
666 : static void change_owner_fix_column_acls(Oid relationOid,
667 : Oid oldOwnerId, Oid newOwnerId);
668 : static void change_owner_recurse_to_sequences(Oid relationOid,
669 : Oid newOwnerId, LOCKMODE lockmode);
670 : static ObjectAddress ATExecClusterOn(Relation rel, const char *indexName,
671 : LOCKMODE lockmode);
672 : static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
673 : static void ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname);
674 : static void ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId);
675 : static void ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel,
676 : bool toLogged);
677 : static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
678 : const char *tablespacename, LOCKMODE lockmode);
679 : static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
680 : static void ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace);
681 : static void ATExecSetRelOptions(Relation rel, List *defList,
682 : AlterTableType operation,
683 : LOCKMODE lockmode);
684 : static void ATExecEnableDisableTrigger(Relation rel, const char *trigname,
685 : char fires_when, bool skip_system, bool recurse,
686 : LOCKMODE lockmode);
687 : static void ATExecEnableDisableRule(Relation rel, const char *rulename,
688 : char fires_when, LOCKMODE lockmode);
689 : static void ATPrepAddInherit(Relation child_rel);
690 : static ObjectAddress ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode);
691 : static ObjectAddress ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode);
692 : static void drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
693 : DependencyType deptype);
694 : static ObjectAddress ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode);
695 : static void ATExecDropOf(Relation rel, LOCKMODE lockmode);
696 : static void ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode);
697 : static void ATExecGenericOptions(Relation rel, List *options);
698 : static void ATExecSetRowSecurity(Relation rel, bool rls);
699 : static void ATExecForceNoForceRowSecurity(Relation rel, bool force_rls);
700 : static ObjectAddress ATExecSetCompression(Relation rel,
701 : const char *column, Node *newValue, LOCKMODE lockmode);
702 :
703 : static void index_copy_data(Relation rel, RelFileLocator newrlocator);
704 : static const char *storage_name(char c);
705 :
706 : static void RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid,
707 : Oid oldRelOid, void *arg);
708 : static void RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid,
709 : Oid oldrelid, void *arg);
710 : static PartitionSpec *transformPartitionSpec(Relation rel, PartitionSpec *partspec);
711 : static void ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
712 : List **partexprs, Oid *partopclass, Oid *partcollation,
713 : PartitionStrategy strategy);
714 : static void CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition);
715 : static void RemoveInheritance(Relation child_rel, Relation parent_rel,
716 : bool expect_detached);
717 : static ObjectAddress ATExecAttachPartition(List **wqueue, Relation rel,
718 : PartitionCmd *cmd,
719 : AlterTableUtilityContext *context);
720 : static void AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel);
721 : static void QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
722 : List *partConstraint,
723 : bool validate_default);
724 : static void CloneRowTriggersToPartition(Relation parent, Relation partition);
725 : static void DropClonedTriggersFromPartition(Oid partitionId);
726 : static ObjectAddress ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab,
727 : Relation rel, RangeVar *name,
728 : bool concurrent);
729 : static void DetachPartitionFinalize(Relation rel, Relation partRel,
730 : bool concurrent, Oid defaultPartOid);
731 : static ObjectAddress ATExecDetachPartitionFinalize(Relation rel, RangeVar *name);
732 : static ObjectAddress ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx,
733 : RangeVar *name);
734 : static void validatePartitionedIndex(Relation partedIdx, Relation partedTbl);
735 : static void refuseDupeIndexAttach(Relation parentIdx, Relation partIdx,
736 : Relation partitionTbl);
737 : static void verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition);
738 : static List *GetParentedForeignKeyRefs(Relation partition);
739 : static void ATDetachCheckNoForeignKeyRefs(Relation partition);
740 : static char GetAttributeCompression(Oid atttypid, const char *compression);
741 : static char GetAttributeStorage(Oid atttypid, const char *storagemode);
742 :
743 :
744 : /* ----------------------------------------------------------------
745 : * DefineRelation
746 : * Creates a new relation.
747 : *
748 : * stmt carries parsetree information from an ordinary CREATE TABLE statement.
749 : * The other arguments are used to extend the behavior for other cases:
750 : * relkind: relkind to assign to the new relation
751 : * ownerId: if not InvalidOid, use this as the new relation's owner.
752 : * typaddress: if not null, it's set to the pg_type entry's address.
753 : * queryString: for error reporting
754 : *
755 : * Note that permissions checks are done against current user regardless of
756 : * ownerId. A nonzero ownerId is used when someone is creating a relation
757 : * "on behalf of" someone else, so we still want to see that the current user
758 : * has permissions to do it.
759 : *
760 : * If successful, returns the address of the new relation.
761 : * ----------------------------------------------------------------
762 : */
763 : ObjectAddress
764 63212 : DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
765 : ObjectAddress *typaddress, const char *queryString)
766 : {
767 : char relname[NAMEDATALEN];
768 : Oid namespaceId;
769 : Oid relationId;
770 : Oid tablespaceId;
771 : Relation rel;
772 : TupleDesc descriptor;
773 : List *inheritOids;
774 : List *old_constraints;
775 : List *old_notnulls;
776 : List *rawDefaults;
777 : List *cookedDefaults;
778 : List *nncols;
779 : Datum reloptions;
780 : ListCell *listptr;
781 : AttrNumber attnum;
782 : bool partitioned;
783 63212 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
784 : Oid ofTypeId;
785 : ObjectAddress address;
786 : LOCKMODE parentLockmode;
787 63212 : Oid accessMethodId = InvalidOid;
788 :
789 : /*
790 : * Truncate relname to appropriate length (probably a waste of time, as
791 : * parser should have done this already).
792 : */
793 63212 : strlcpy(relname, stmt->relation->relname, NAMEDATALEN);
794 :
795 : /*
796 : * Check consistency of arguments
797 : */
798 63212 : if (stmt->oncommit != ONCOMMIT_NOOP
799 188 : && stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
800 12 : ereport(ERROR,
801 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
802 : errmsg("ON COMMIT can only be used on temporary tables")));
803 :
804 63200 : if (stmt->partspec != NULL)
805 : {
806 5094 : if (relkind != RELKIND_RELATION)
807 0 : elog(ERROR, "unexpected relkind: %d", (int) relkind);
808 :
809 5094 : relkind = RELKIND_PARTITIONED_TABLE;
810 5094 : partitioned = true;
811 : }
812 : else
813 58106 : partitioned = false;
814 :
815 63200 : if (relkind == RELKIND_PARTITIONED_TABLE &&
816 5094 : stmt->relation->relpersistence == RELPERSISTENCE_UNLOGGED)
817 6 : ereport(ERROR,
818 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
819 : errmsg("partitioned tables cannot be unlogged")));
820 :
821 : /*
822 : * Look up the namespace in which we are supposed to create the relation,
823 : * check we have permission to create there, lock it against concurrent
824 : * drop, and mark stmt->relation as RELPERSISTENCE_TEMP if a temporary
825 : * namespace is selected.
826 : */
827 : namespaceId =
828 63194 : RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
829 :
830 : /*
831 : * Security check: disallow creating temp tables from security-restricted
832 : * code. This is needed because calling code might not expect untrusted
833 : * tables to appear in pg_temp at the front of its search path.
834 : */
835 63194 : if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
836 3220 : && InSecurityRestrictedOperation())
837 0 : ereport(ERROR,
838 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
839 : errmsg("cannot create temporary table within security-restricted operation")));
840 :
841 : /*
842 : * Determine the lockmode to use when scanning parents. A self-exclusive
843 : * lock is needed here.
844 : *
845 : * For regular inheritance, if two backends attempt to add children to the
846 : * same parent simultaneously, and that parent has no pre-existing
847 : * children, then both will attempt to update the parent's relhassubclass
848 : * field, leading to a "tuple concurrently updated" error. Also, this
849 : * interlocks against a concurrent ANALYZE on the parent table, which
850 : * might otherwise be attempting to clear the parent's relhassubclass
851 : * field, if its previous children were recently dropped.
852 : *
853 : * If the child table is a partition, then we instead grab an exclusive
854 : * lock on the parent because its partition descriptor will be changed by
855 : * addition of the new partition.
856 : */
857 63194 : parentLockmode = (stmt->partbound != NULL ? AccessExclusiveLock :
858 : ShareUpdateExclusiveLock);
859 :
860 : /* Determine the list of OIDs of the parents. */
861 63194 : inheritOids = NIL;
862 73900 : foreach(listptr, stmt->inhRelations)
863 : {
864 10706 : RangeVar *rv = (RangeVar *) lfirst(listptr);
865 : Oid parentOid;
866 :
867 10706 : parentOid = RangeVarGetRelid(rv, parentLockmode, false);
868 :
869 : /*
870 : * Reject duplications in the list of parents.
871 : */
872 10706 : if (list_member_oid(inheritOids, parentOid))
873 0 : ereport(ERROR,
874 : (errcode(ERRCODE_DUPLICATE_TABLE),
875 : errmsg("relation \"%s\" would be inherited from more than once",
876 : get_rel_name(parentOid))));
877 :
878 10706 : inheritOids = lappend_oid(inheritOids, parentOid);
879 : }
880 :
881 : /*
882 : * Select tablespace to use: an explicitly indicated one, or (in the case
883 : * of a partitioned table) the parent's, if it has one.
884 : */
885 63194 : if (stmt->tablespacename)
886 : {
887 128 : tablespaceId = get_tablespace_oid(stmt->tablespacename, false);
888 :
889 122 : if (partitioned && tablespaceId == MyDatabaseTableSpace)
890 6 : ereport(ERROR,
891 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
892 : errmsg("cannot specify default tablespace for partitioned relations")));
893 : }
894 63066 : else if (stmt->partbound)
895 : {
896 : Assert(list_length(inheritOids) == 1);
897 8180 : tablespaceId = get_rel_tablespace(linitial_oid(inheritOids));
898 : }
899 : else
900 54886 : tablespaceId = InvalidOid;
901 :
902 : /* still nothing? use the default */
903 63182 : if (!OidIsValid(tablespaceId))
904 63044 : tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence,
905 : partitioned);
906 :
907 : /* Check permissions except when using database's default */
908 63176 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
909 : {
910 : AclResult aclresult;
911 :
912 164 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(),
913 : ACL_CREATE);
914 164 : if (aclresult != ACLCHECK_OK)
915 6 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
916 6 : get_tablespace_name(tablespaceId));
917 : }
918 :
919 : /* In all cases disallow placing user relations in pg_global */
920 63170 : if (tablespaceId == GLOBALTABLESPACE_OID)
921 18 : ereport(ERROR,
922 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
923 : errmsg("only shared relations can be placed in pg_global tablespace")));
924 :
925 : /* Identify user ID that will own the table */
926 63152 : if (!OidIsValid(ownerId))
927 62912 : ownerId = GetUserId();
928 :
929 : /*
930 : * Parse and validate reloptions, if any.
931 : */
932 63152 : reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
933 : true, false);
934 :
935 63134 : switch (relkind)
936 : {
937 16786 : case RELKIND_VIEW:
938 16786 : (void) view_reloptions(reloptions, true);
939 16768 : break;
940 5070 : case RELKIND_PARTITIONED_TABLE:
941 5070 : (void) partitioned_table_reloptions(reloptions, true);
942 5064 : break;
943 41278 : default:
944 41278 : (void) heap_reloptions(relkind, reloptions, true);
945 : }
946 :
947 63014 : if (stmt->ofTypename)
948 : {
949 : AclResult aclresult;
950 :
951 86 : ofTypeId = typenameTypeId(NULL, stmt->ofTypename);
952 :
953 86 : aclresult = object_aclcheck(TypeRelationId, ofTypeId, GetUserId(), ACL_USAGE);
954 86 : if (aclresult != ACLCHECK_OK)
955 6 : aclcheck_error_type(aclresult, ofTypeId);
956 : }
957 : else
958 62928 : ofTypeId = InvalidOid;
959 :
960 : /*
961 : * Look up inheritance ancestors and generate relation schema, including
962 : * inherited attributes. (Note that stmt->tableElts is destructively
963 : * modified by MergeAttributes.)
964 : */
965 62768 : stmt->tableElts =
966 63008 : MergeAttributes(stmt->tableElts, inheritOids,
967 63008 : stmt->relation->relpersistence,
968 63008 : stmt->partbound != NULL,
969 : &old_constraints, &old_notnulls);
970 :
971 : /*
972 : * Create a tuple descriptor from the relation schema. Note that this
973 : * deals with column names, types, and in-descriptor NOT NULL flags, but
974 : * not default values, NOT NULL or CHECK constraints; we handle those
975 : * below.
976 : */
977 62768 : descriptor = BuildDescForRelation(stmt->tableElts);
978 :
979 : /*
980 : * Find columns with default values and prepare for insertion of the
981 : * defaults. Pre-cooked (that is, inherited) defaults go into a list of
982 : * CookedConstraint structs that we'll pass to heap_create_with_catalog,
983 : * while raw defaults go into a list of RawColumnDefault structs that will
984 : * be processed by AddRelationNewConstraints. (We can't deal with raw
985 : * expressions until we can do transformExpr.)
986 : */
987 62720 : rawDefaults = NIL;
988 62720 : cookedDefaults = NIL;
989 62720 : attnum = 0;
990 :
991 318742 : foreach(listptr, stmt->tableElts)
992 : {
993 256022 : ColumnDef *colDef = lfirst(listptr);
994 :
995 256022 : attnum++;
996 256022 : if (colDef->raw_default != NULL)
997 : {
998 : RawColumnDefault *rawEnt;
999 :
1000 : Assert(colDef->cooked_default == NULL);
1001 :
1002 3220 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
1003 3220 : rawEnt->attnum = attnum;
1004 3220 : rawEnt->raw_default = colDef->raw_default;
1005 3220 : rawEnt->generated = colDef->generated;
1006 3220 : rawDefaults = lappend(rawDefaults, rawEnt);
1007 : }
1008 252802 : else if (colDef->cooked_default != NULL)
1009 : {
1010 : CookedConstraint *cooked;
1011 :
1012 402 : cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
1013 402 : cooked->contype = CONSTR_DEFAULT;
1014 402 : cooked->conoid = InvalidOid; /* until created */
1015 402 : cooked->name = NULL;
1016 402 : cooked->attnum = attnum;
1017 402 : cooked->expr = colDef->cooked_default;
1018 402 : cooked->is_enforced = true;
1019 402 : cooked->skip_validation = false;
1020 402 : cooked->is_local = true; /* not used for defaults */
1021 402 : cooked->inhcount = 0; /* ditto */
1022 402 : cooked->is_no_inherit = false;
1023 402 : cookedDefaults = lappend(cookedDefaults, cooked);
1024 : }
1025 : }
1026 :
1027 : /*
1028 : * For relations with table AM and partitioned tables, select access
1029 : * method to use: an explicitly indicated one, or (in the case of a
1030 : * partitioned table) the parent's, if it has one.
1031 : */
1032 62720 : if (stmt->accessMethod != NULL)
1033 : {
1034 : Assert(RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE);
1035 122 : accessMethodId = get_table_am_oid(stmt->accessMethod, false);
1036 : }
1037 62598 : else if (RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE)
1038 : {
1039 39040 : if (stmt->partbound)
1040 : {
1041 : Assert(list_length(inheritOids) == 1);
1042 7998 : accessMethodId = get_rel_relam(linitial_oid(inheritOids));
1043 : }
1044 :
1045 39040 : if (RELKIND_HAS_TABLE_AM(relkind) && !OidIsValid(accessMethodId))
1046 33962 : accessMethodId = get_table_am_oid(default_table_access_method, false);
1047 : }
1048 :
1049 : /*
1050 : * Create the relation. Inherited defaults and CHECK constraints are
1051 : * passed in for immediate handling --- since they don't need parsing,
1052 : * they can be stored immediately.
1053 : */
1054 62702 : relationId = heap_create_with_catalog(relname,
1055 : namespaceId,
1056 : tablespaceId,
1057 : InvalidOid,
1058 : InvalidOid,
1059 : ofTypeId,
1060 : ownerId,
1061 : accessMethodId,
1062 : descriptor,
1063 : list_concat(cookedDefaults,
1064 : old_constraints),
1065 : relkind,
1066 62702 : stmt->relation->relpersistence,
1067 : false,
1068 : false,
1069 : stmt->oncommit,
1070 : reloptions,
1071 : true,
1072 : allowSystemTableMods,
1073 : false,
1074 : InvalidOid,
1075 : typaddress);
1076 :
1077 : /*
1078 : * We must bump the command counter to make the newly-created relation
1079 : * tuple visible for opening.
1080 : */
1081 62654 : CommandCounterIncrement();
1082 :
1083 : /*
1084 : * Open the new relation and acquire exclusive lock on it. This isn't
1085 : * really necessary for locking out other backends (since they can't see
1086 : * the new rel anyway until we commit), but it keeps the lock manager from
1087 : * complaining about deadlock risks.
1088 : */
1089 62654 : rel = relation_open(relationId, AccessExclusiveLock);
1090 :
1091 : /*
1092 : * Now add any newly specified column default and generation expressions
1093 : * to the new relation. These are passed to us in the form of raw
1094 : * parsetrees; we need to transform them to executable expression trees
1095 : * before they can be added. The most convenient way to do that is to
1096 : * apply the parser's transformExpr routine, but transformExpr doesn't
1097 : * work unless we have a pre-existing relation. So, the transformation has
1098 : * to be postponed to this final step of CREATE TABLE.
1099 : *
1100 : * This needs to be before processing the partitioning clauses because
1101 : * those could refer to generated columns.
1102 : */
1103 62654 : if (rawDefaults)
1104 2754 : AddRelationNewConstraints(rel, rawDefaults, NIL,
1105 : true, true, false, queryString);
1106 :
1107 : /*
1108 : * Make column generation expressions visible for use by partitioning.
1109 : */
1110 62462 : CommandCounterIncrement();
1111 :
1112 : /* Process and store partition bound, if any. */
1113 62462 : if (stmt->partbound)
1114 : {
1115 : PartitionBoundSpec *bound;
1116 : ParseState *pstate;
1117 8102 : Oid parentId = linitial_oid(inheritOids),
1118 : defaultPartOid;
1119 : Relation parent,
1120 8102 : defaultRel = NULL;
1121 : ParseNamespaceItem *nsitem;
1122 :
1123 : /* Already have strong enough lock on the parent */
1124 8102 : parent = table_open(parentId, NoLock);
1125 :
1126 : /*
1127 : * We are going to try to validate the partition bound specification
1128 : * against the partition key of parentRel, so it better have one.
1129 : */
1130 8102 : if (parent->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1131 18 : ereport(ERROR,
1132 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
1133 : errmsg("\"%s\" is not partitioned",
1134 : RelationGetRelationName(parent))));
1135 :
1136 : /*
1137 : * The partition constraint of the default partition depends on the
1138 : * partition bounds of every other partition. It is possible that
1139 : * another backend might be about to execute a query on the default
1140 : * partition table, and that the query relies on previously cached
1141 : * default partition constraints. We must therefore take a table lock
1142 : * strong enough to prevent all queries on the default partition from
1143 : * proceeding until we commit and send out a shared-cache-inval notice
1144 : * that will make them update their index lists.
1145 : *
1146 : * Order of locking: The relation being added won't be visible to
1147 : * other backends until it is committed, hence here in
1148 : * DefineRelation() the order of locking the default partition and the
1149 : * relation being added does not matter. But at all other places we
1150 : * need to lock the default relation before we lock the relation being
1151 : * added or removed i.e. we should take the lock in same order at all
1152 : * the places such that lock parent, lock default partition and then
1153 : * lock the partition so as to avoid a deadlock.
1154 : */
1155 : defaultPartOid =
1156 8084 : get_default_oid_from_partdesc(RelationGetPartitionDesc(parent,
1157 : true));
1158 8084 : if (OidIsValid(defaultPartOid))
1159 378 : defaultRel = table_open(defaultPartOid, AccessExclusiveLock);
1160 :
1161 : /* Transform the bound values */
1162 8084 : pstate = make_parsestate(NULL);
1163 8084 : pstate->p_sourcetext = queryString;
1164 :
1165 : /*
1166 : * Add an nsitem containing this relation, so that transformExpr
1167 : * called on partition bound expressions is able to report errors
1168 : * using a proper context.
1169 : */
1170 8084 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
1171 : NULL, false, false);
1172 8084 : addNSItemToQuery(pstate, nsitem, false, true, true);
1173 :
1174 8084 : bound = transformPartitionBound(pstate, parent, stmt->partbound);
1175 :
1176 : /*
1177 : * Check first that the new partition's bound is valid and does not
1178 : * overlap with any of existing partitions of the parent.
1179 : */
1180 7880 : check_new_partition_bound(relname, parent, bound, pstate);
1181 :
1182 : /*
1183 : * If the default partition exists, its partition constraints will
1184 : * change after the addition of this new partition such that it won't
1185 : * allow any row that qualifies for this new partition. So, check that
1186 : * the existing data in the default partition satisfies the constraint
1187 : * as it will exist after adding this partition.
1188 : */
1189 7766 : if (OidIsValid(defaultPartOid))
1190 : {
1191 348 : check_default_partition_contents(parent, defaultRel, bound);
1192 : /* Keep the lock until commit. */
1193 330 : table_close(defaultRel, NoLock);
1194 : }
1195 :
1196 : /* Update the pg_class entry. */
1197 7748 : StorePartitionBound(rel, parent, bound);
1198 :
1199 7748 : table_close(parent, NoLock);
1200 : }
1201 :
1202 : /* Store inheritance information for new rel. */
1203 62108 : StoreCatalogInheritance(relationId, inheritOids, stmt->partbound != NULL);
1204 :
1205 : /*
1206 : * Process the partitioning specification (if any) and store the partition
1207 : * key information into the catalog.
1208 : */
1209 62108 : if (partitioned)
1210 : {
1211 : ParseState *pstate;
1212 : int partnatts;
1213 : AttrNumber partattrs[PARTITION_MAX_KEYS];
1214 : Oid partopclass[PARTITION_MAX_KEYS];
1215 : Oid partcollation[PARTITION_MAX_KEYS];
1216 5064 : List *partexprs = NIL;
1217 :
1218 5064 : pstate = make_parsestate(NULL);
1219 5064 : pstate->p_sourcetext = queryString;
1220 :
1221 5064 : partnatts = list_length(stmt->partspec->partParams);
1222 :
1223 : /* Protect fixed-size arrays here and in executor */
1224 5064 : if (partnatts > PARTITION_MAX_KEYS)
1225 0 : ereport(ERROR,
1226 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
1227 : errmsg("cannot partition using more than %d columns",
1228 : PARTITION_MAX_KEYS)));
1229 :
1230 : /*
1231 : * We need to transform the raw parsetrees corresponding to partition
1232 : * expressions into executable expression trees. Like column defaults
1233 : * and CHECK constraints, we could not have done the transformation
1234 : * earlier.
1235 : */
1236 5064 : stmt->partspec = transformPartitionSpec(rel, stmt->partspec);
1237 :
1238 5034 : ComputePartitionAttrs(pstate, rel, stmt->partspec->partParams,
1239 : partattrs, &partexprs, partopclass,
1240 5034 : partcollation, stmt->partspec->strategy);
1241 :
1242 4938 : StorePartitionKey(rel, stmt->partspec->strategy, partnatts, partattrs,
1243 : partexprs,
1244 : partopclass, partcollation);
1245 :
1246 : /* make it all visible */
1247 4938 : CommandCounterIncrement();
1248 : }
1249 :
1250 : /*
1251 : * If we're creating a partition, create now all the indexes, triggers,
1252 : * FKs defined in the parent.
1253 : *
1254 : * We can't do it earlier, because DefineIndex wants to know the partition
1255 : * key which we just stored.
1256 : */
1257 61982 : if (stmt->partbound)
1258 : {
1259 7742 : Oid parentId = linitial_oid(inheritOids);
1260 : Relation parent;
1261 : List *idxlist;
1262 : ListCell *cell;
1263 :
1264 : /* Already have strong enough lock on the parent */
1265 7742 : parent = table_open(parentId, NoLock);
1266 7742 : idxlist = RelationGetIndexList(parent);
1267 :
1268 : /*
1269 : * For each index in the parent table, create one in the partition
1270 : */
1271 9162 : foreach(cell, idxlist)
1272 : {
1273 1438 : Relation idxRel = index_open(lfirst_oid(cell), AccessShareLock);
1274 : AttrMap *attmap;
1275 : IndexStmt *idxstmt;
1276 : Oid constraintOid;
1277 :
1278 1438 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
1279 : {
1280 36 : if (idxRel->rd_index->indisunique)
1281 12 : ereport(ERROR,
1282 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1283 : errmsg("cannot create foreign partition of partitioned table \"%s\"",
1284 : RelationGetRelationName(parent)),
1285 : errdetail("Table \"%s\" contains indexes that are unique.",
1286 : RelationGetRelationName(parent))));
1287 : else
1288 : {
1289 24 : index_close(idxRel, AccessShareLock);
1290 24 : continue;
1291 : }
1292 : }
1293 :
1294 1402 : attmap = build_attrmap_by_name(RelationGetDescr(rel),
1295 : RelationGetDescr(parent),
1296 : false);
1297 : idxstmt =
1298 1402 : generateClonedIndexStmt(NULL, idxRel,
1299 : attmap, &constraintOid);
1300 1402 : DefineIndex(RelationGetRelid(rel),
1301 : idxstmt,
1302 : InvalidOid,
1303 : RelationGetRelid(idxRel),
1304 : constraintOid,
1305 : -1,
1306 : false, false, false, false, false);
1307 :
1308 1396 : index_close(idxRel, AccessShareLock);
1309 : }
1310 :
1311 7724 : list_free(idxlist);
1312 :
1313 : /*
1314 : * If there are any row-level triggers, clone them to the new
1315 : * partition.
1316 : */
1317 7724 : if (parent->trigdesc != NULL)
1318 444 : CloneRowTriggersToPartition(parent, rel);
1319 :
1320 : /*
1321 : * And foreign keys too. Note that because we're freshly creating the
1322 : * table, there is no need to verify these new constraints.
1323 : */
1324 7724 : CloneForeignKeyConstraints(NULL, parent, rel);
1325 :
1326 7724 : table_close(parent, NoLock);
1327 : }
1328 :
1329 : /*
1330 : * Now add any newly specified CHECK constraints to the new relation. Same
1331 : * as for defaults above, but these need to come after partitioning is set
1332 : * up.
1333 : */
1334 61964 : if (stmt->constraints)
1335 736 : AddRelationNewConstraints(rel, NIL, stmt->constraints,
1336 : true, true, false, queryString);
1337 :
1338 : /*
1339 : * Finally, merge the not-null constraints that are declared directly with
1340 : * those that come from parent relations (making sure to count inheritance
1341 : * appropriately for each), create them, and set the attnotnull flag on
1342 : * columns that don't yet have it.
1343 : */
1344 61934 : nncols = AddRelationNotNullConstraints(rel, stmt->nnconstraints,
1345 : old_notnulls);
1346 139058 : foreach_int(attrnum, nncols)
1347 15346 : set_attnotnull(NULL, rel, attrnum, true, false);
1348 :
1349 61856 : ObjectAddressSet(address, RelationRelationId, relationId);
1350 :
1351 : /*
1352 : * Clean up. We keep lock on new relation (although it shouldn't be
1353 : * visible to anyone else anyway, until commit).
1354 : */
1355 61856 : relation_close(rel, NoLock);
1356 :
1357 61856 : return address;
1358 : }
1359 :
1360 : /*
1361 : * BuildDescForRelation
1362 : *
1363 : * Given a list of ColumnDef nodes, build a TupleDesc.
1364 : *
1365 : * Note: This is only for the limited purpose of table and view creation. Not
1366 : * everything is filled in. A real tuple descriptor should be obtained from
1367 : * the relcache.
1368 : */
1369 : TupleDesc
1370 65758 : BuildDescForRelation(const List *columns)
1371 : {
1372 : int natts;
1373 : AttrNumber attnum;
1374 : ListCell *l;
1375 : TupleDesc desc;
1376 : char *attname;
1377 : Oid atttypid;
1378 : int32 atttypmod;
1379 : Oid attcollation;
1380 : int attdim;
1381 :
1382 : /*
1383 : * allocate a new tuple descriptor
1384 : */
1385 65758 : natts = list_length(columns);
1386 65758 : desc = CreateTemplateTupleDesc(natts);
1387 :
1388 65758 : attnum = 0;
1389 :
1390 325034 : foreach(l, columns)
1391 : {
1392 259336 : ColumnDef *entry = lfirst(l);
1393 : AclResult aclresult;
1394 : Form_pg_attribute att;
1395 :
1396 : /*
1397 : * for each entry in the list, get the name and type information from
1398 : * the list and have TupleDescInitEntry fill in the attribute
1399 : * information we need.
1400 : */
1401 259336 : attnum++;
1402 :
1403 259336 : attname = entry->colname;
1404 259336 : typenameTypeIdAndMod(NULL, entry->typeName, &atttypid, &atttypmod);
1405 :
1406 259336 : aclresult = object_aclcheck(TypeRelationId, atttypid, GetUserId(), ACL_USAGE);
1407 259336 : if (aclresult != ACLCHECK_OK)
1408 42 : aclcheck_error_type(aclresult, atttypid);
1409 :
1410 259294 : attcollation = GetColumnDefCollation(NULL, entry, atttypid);
1411 259294 : attdim = list_length(entry->typeName->arrayBounds);
1412 259294 : if (attdim > PG_INT16_MAX)
1413 0 : ereport(ERROR,
1414 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1415 : errmsg("too many array dimensions"));
1416 :
1417 259294 : if (entry->typeName->setof)
1418 0 : ereport(ERROR,
1419 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1420 : errmsg("column \"%s\" cannot be declared SETOF",
1421 : attname)));
1422 :
1423 259294 : TupleDescInitEntry(desc, attnum, attname,
1424 : atttypid, atttypmod, attdim);
1425 259294 : att = TupleDescAttr(desc, attnum - 1);
1426 :
1427 : /* Override TupleDescInitEntry's settings as requested */
1428 259294 : TupleDescInitEntryCollation(desc, attnum, attcollation);
1429 :
1430 : /* Fill in additional stuff not handled by TupleDescInitEntry */
1431 259294 : att->attnotnull = entry->is_not_null;
1432 259294 : att->attislocal = entry->is_local;
1433 259294 : att->attinhcount = entry->inhcount;
1434 259294 : att->attidentity = entry->identity;
1435 259294 : att->attgenerated = entry->generated;
1436 259294 : att->attcompression = GetAttributeCompression(att->atttypid, entry->compression);
1437 259282 : if (entry->storage)
1438 20624 : att->attstorage = entry->storage;
1439 238658 : else if (entry->storage_name)
1440 26 : att->attstorage = GetAttributeStorage(att->atttypid, entry->storage_name);
1441 :
1442 259276 : populate_compact_attribute(desc, attnum - 1);
1443 : }
1444 :
1445 65698 : return desc;
1446 : }
1447 :
1448 : /*
1449 : * Emit the right error or warning message for a "DROP" command issued on a
1450 : * non-existent relation
1451 : */
1452 : static void
1453 1088 : DropErrorMsgNonExistent(RangeVar *rel, char rightkind, bool missing_ok)
1454 : {
1455 : const struct dropmsgstrings *rentry;
1456 :
1457 1208 : if (rel->schemaname != NULL &&
1458 120 : !OidIsValid(LookupNamespaceNoError(rel->schemaname)))
1459 : {
1460 42 : if (!missing_ok)
1461 : {
1462 0 : ereport(ERROR,
1463 : (errcode(ERRCODE_UNDEFINED_SCHEMA),
1464 : errmsg("schema \"%s\" does not exist", rel->schemaname)));
1465 : }
1466 : else
1467 : {
1468 42 : ereport(NOTICE,
1469 : (errmsg("schema \"%s\" does not exist, skipping",
1470 : rel->schemaname)));
1471 : }
1472 42 : return;
1473 : }
1474 :
1475 1366 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1476 : {
1477 1366 : if (rentry->kind == rightkind)
1478 : {
1479 1046 : if (!missing_ok)
1480 : {
1481 138 : ereport(ERROR,
1482 : (errcode(rentry->nonexistent_code),
1483 : errmsg(rentry->nonexistent_msg, rel->relname)));
1484 : }
1485 : else
1486 : {
1487 908 : ereport(NOTICE, (errmsg(rentry->skipping_msg, rel->relname)));
1488 908 : break;
1489 : }
1490 : }
1491 : }
1492 :
1493 : Assert(rentry->kind != '\0'); /* Should be impossible */
1494 : }
1495 :
1496 : /*
1497 : * Emit the right error message for a "DROP" command issued on a
1498 : * relation of the wrong type
1499 : */
1500 : static void
1501 0 : DropErrorMsgWrongType(const char *relname, char wrongkind, char rightkind)
1502 : {
1503 : const struct dropmsgstrings *rentry;
1504 : const struct dropmsgstrings *wentry;
1505 :
1506 0 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1507 0 : if (rentry->kind == rightkind)
1508 0 : break;
1509 : Assert(rentry->kind != '\0');
1510 :
1511 0 : for (wentry = dropmsgstringarray; wentry->kind != '\0'; wentry++)
1512 0 : if (wentry->kind == wrongkind)
1513 0 : break;
1514 : /* wrongkind could be something we don't have in our table... */
1515 :
1516 0 : ereport(ERROR,
1517 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1518 : errmsg(rentry->nota_msg, relname),
1519 : (wentry->kind != '\0') ? errhint("%s", _(wentry->drophint_msg)) : 0));
1520 : }
1521 :
1522 : /*
1523 : * RemoveRelations
1524 : * Implements DROP TABLE, DROP INDEX, DROP SEQUENCE, DROP VIEW,
1525 : * DROP MATERIALIZED VIEW, DROP FOREIGN TABLE
1526 : */
1527 : void
1528 17556 : RemoveRelations(DropStmt *drop)
1529 : {
1530 : ObjectAddresses *objects;
1531 : char relkind;
1532 : ListCell *cell;
1533 17556 : int flags = 0;
1534 17556 : LOCKMODE lockmode = AccessExclusiveLock;
1535 :
1536 : /* DROP CONCURRENTLY uses a weaker lock, and has some restrictions */
1537 17556 : if (drop->concurrent)
1538 : {
1539 : /*
1540 : * Note that for temporary relations this lock may get upgraded later
1541 : * on, but as no other session can access a temporary relation, this
1542 : * is actually fine.
1543 : */
1544 210 : lockmode = ShareUpdateExclusiveLock;
1545 : Assert(drop->removeType == OBJECT_INDEX);
1546 210 : if (list_length(drop->objects) != 1)
1547 6 : ereport(ERROR,
1548 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1549 : errmsg("DROP INDEX CONCURRENTLY does not support dropping multiple objects")));
1550 204 : if (drop->behavior == DROP_CASCADE)
1551 0 : ereport(ERROR,
1552 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1553 : errmsg("DROP INDEX CONCURRENTLY does not support CASCADE")));
1554 : }
1555 :
1556 : /*
1557 : * First we identify all the relations, then we delete them in a single
1558 : * performMultipleDeletions() call. This is to avoid unwanted DROP
1559 : * RESTRICT errors if one of the relations depends on another.
1560 : */
1561 :
1562 : /* Determine required relkind */
1563 17550 : switch (drop->removeType)
1564 : {
1565 15232 : case OBJECT_TABLE:
1566 15232 : relkind = RELKIND_RELATION;
1567 15232 : break;
1568 :
1569 892 : case OBJECT_INDEX:
1570 892 : relkind = RELKIND_INDEX;
1571 892 : break;
1572 :
1573 176 : case OBJECT_SEQUENCE:
1574 176 : relkind = RELKIND_SEQUENCE;
1575 176 : break;
1576 :
1577 960 : case OBJECT_VIEW:
1578 960 : relkind = RELKIND_VIEW;
1579 960 : break;
1580 :
1581 126 : case OBJECT_MATVIEW:
1582 126 : relkind = RELKIND_MATVIEW;
1583 126 : break;
1584 :
1585 164 : case OBJECT_FOREIGN_TABLE:
1586 164 : relkind = RELKIND_FOREIGN_TABLE;
1587 164 : break;
1588 :
1589 0 : default:
1590 0 : elog(ERROR, "unrecognized drop object type: %d",
1591 : (int) drop->removeType);
1592 : relkind = 0; /* keep compiler quiet */
1593 : break;
1594 : }
1595 :
1596 : /* Lock and validate each relation; build a list of object addresses */
1597 17550 : objects = new_object_addresses();
1598 :
1599 39110 : foreach(cell, drop->objects)
1600 : {
1601 21724 : RangeVar *rel = makeRangeVarFromNameList((List *) lfirst(cell));
1602 : Oid relOid;
1603 : ObjectAddress obj;
1604 : struct DropRelationCallbackState state;
1605 :
1606 : /*
1607 : * These next few steps are a great deal like relation_openrv, but we
1608 : * don't bother building a relcache entry since we don't need it.
1609 : *
1610 : * Check for shared-cache-inval messages before trying to access the
1611 : * relation. This is needed to cover the case where the name
1612 : * identifies a rel that has been dropped and recreated since the
1613 : * start of our transaction: if we don't flush the old syscache entry,
1614 : * then we'll latch onto that entry and suffer an error later.
1615 : */
1616 21724 : AcceptInvalidationMessages();
1617 :
1618 : /* Look up the appropriate relation using namespace search. */
1619 21724 : state.expected_relkind = relkind;
1620 43448 : state.heap_lockmode = drop->concurrent ?
1621 21724 : ShareUpdateExclusiveLock : AccessExclusiveLock;
1622 : /* We must initialize these fields to show that no locks are held: */
1623 21724 : state.heapOid = InvalidOid;
1624 21724 : state.partParentOid = InvalidOid;
1625 :
1626 21724 : relOid = RangeVarGetRelidExtended(rel, lockmode, RVR_MISSING_OK,
1627 : RangeVarCallbackForDropRelation,
1628 : &state);
1629 :
1630 : /* Not there? */
1631 21704 : if (!OidIsValid(relOid))
1632 : {
1633 1088 : DropErrorMsgNonExistent(rel, relkind, drop->missing_ok);
1634 950 : continue;
1635 : }
1636 :
1637 : /*
1638 : * Decide if concurrent mode needs to be used here or not. The
1639 : * callback retrieved the rel's persistence for us.
1640 : */
1641 20616 : if (drop->concurrent &&
1642 198 : state.actual_relpersistence != RELPERSISTENCE_TEMP)
1643 : {
1644 : Assert(list_length(drop->objects) == 1 &&
1645 : drop->removeType == OBJECT_INDEX);
1646 180 : flags |= PERFORM_DELETION_CONCURRENTLY;
1647 : }
1648 :
1649 : /*
1650 : * Concurrent index drop cannot be used with partitioned indexes,
1651 : * either.
1652 : */
1653 20616 : if ((flags & PERFORM_DELETION_CONCURRENTLY) != 0 &&
1654 180 : state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1655 6 : ereport(ERROR,
1656 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1657 : errmsg("cannot drop partitioned index \"%s\" concurrently",
1658 : rel->relname)));
1659 :
1660 : /*
1661 : * If we're told to drop a partitioned index, we must acquire lock on
1662 : * all the children of its parent partitioned table before proceeding.
1663 : * Otherwise we'd try to lock the child index partitions before their
1664 : * tables, leading to potential deadlock against other sessions that
1665 : * will lock those objects in the other order.
1666 : */
1667 20610 : if (state.actual_relkind == RELKIND_PARTITIONED_INDEX)
1668 76 : (void) find_all_inheritors(state.heapOid,
1669 : state.heap_lockmode,
1670 : NULL);
1671 :
1672 : /* OK, we're ready to delete this one */
1673 20610 : obj.classId = RelationRelationId;
1674 20610 : obj.objectId = relOid;
1675 20610 : obj.objectSubId = 0;
1676 :
1677 20610 : add_exact_object_address(&obj, objects);
1678 : }
1679 :
1680 17386 : performMultipleDeletions(objects, drop->behavior, flags);
1681 :
1682 17244 : free_object_addresses(objects);
1683 17244 : }
1684 :
1685 : /*
1686 : * Before acquiring a table lock, check whether we have sufficient rights.
1687 : * In the case of DROP INDEX, also try to lock the table before the index.
1688 : * Also, if the table to be dropped is a partition, we try to lock the parent
1689 : * first.
1690 : */
1691 : static void
1692 22152 : RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid, Oid oldRelOid,
1693 : void *arg)
1694 : {
1695 : HeapTuple tuple;
1696 : struct DropRelationCallbackState *state;
1697 : char expected_relkind;
1698 : bool is_partition;
1699 : Form_pg_class classform;
1700 : LOCKMODE heap_lockmode;
1701 22152 : bool invalid_system_index = false;
1702 :
1703 22152 : state = (struct DropRelationCallbackState *) arg;
1704 22152 : heap_lockmode = state->heap_lockmode;
1705 :
1706 : /*
1707 : * If we previously locked some other index's heap, and the name we're
1708 : * looking up no longer refers to that relation, release the now-useless
1709 : * lock.
1710 : */
1711 22152 : if (relOid != oldRelOid && OidIsValid(state->heapOid))
1712 : {
1713 0 : UnlockRelationOid(state->heapOid, heap_lockmode);
1714 0 : state->heapOid = InvalidOid;
1715 : }
1716 :
1717 : /*
1718 : * Similarly, if we previously locked some other partition's heap, and the
1719 : * name we're looking up no longer refers to that relation, release the
1720 : * now-useless lock.
1721 : */
1722 22152 : if (relOid != oldRelOid && OidIsValid(state->partParentOid))
1723 : {
1724 0 : UnlockRelationOid(state->partParentOid, AccessExclusiveLock);
1725 0 : state->partParentOid = InvalidOid;
1726 : }
1727 :
1728 : /* Didn't find a relation, so no need for locking or permission checks. */
1729 22152 : if (!OidIsValid(relOid))
1730 1100 : return;
1731 :
1732 21052 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
1733 21052 : if (!HeapTupleIsValid(tuple))
1734 0 : return; /* concurrently dropped, so nothing to do */
1735 21052 : classform = (Form_pg_class) GETSTRUCT(tuple);
1736 21052 : is_partition = classform->relispartition;
1737 :
1738 : /* Pass back some data to save lookups in RemoveRelations */
1739 21052 : state->actual_relkind = classform->relkind;
1740 21052 : state->actual_relpersistence = classform->relpersistence;
1741 :
1742 : /*
1743 : * Both RELKIND_RELATION and RELKIND_PARTITIONED_TABLE are OBJECT_TABLE,
1744 : * but RemoveRelations() can only pass one relkind for a given relation.
1745 : * It chooses RELKIND_RELATION for both regular and partitioned tables.
1746 : * That means we must be careful before giving the wrong type error when
1747 : * the relation is RELKIND_PARTITIONED_TABLE. An equivalent problem
1748 : * exists with indexes.
1749 : */
1750 21052 : if (classform->relkind == RELKIND_PARTITIONED_TABLE)
1751 3042 : expected_relkind = RELKIND_RELATION;
1752 18010 : else if (classform->relkind == RELKIND_PARTITIONED_INDEX)
1753 88 : expected_relkind = RELKIND_INDEX;
1754 : else
1755 17922 : expected_relkind = classform->relkind;
1756 :
1757 21052 : if (state->expected_relkind != expected_relkind)
1758 0 : DropErrorMsgWrongType(rel->relname, classform->relkind,
1759 0 : state->expected_relkind);
1760 :
1761 : /* Allow DROP to either table owner or schema owner */
1762 21052 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()) &&
1763 18 : !object_ownercheck(NamespaceRelationId, classform->relnamespace, GetUserId()))
1764 18 : aclcheck_error(ACLCHECK_NOT_OWNER,
1765 18 : get_relkind_objtype(classform->relkind),
1766 18 : rel->relname);
1767 :
1768 : /*
1769 : * Check the case of a system index that might have been invalidated by a
1770 : * failed concurrent process and allow its drop. For the time being, this
1771 : * only concerns indexes of toast relations that became invalid during a
1772 : * REINDEX CONCURRENTLY process.
1773 : */
1774 21034 : if (IsSystemClass(relOid, classform) && classform->relkind == RELKIND_INDEX)
1775 : {
1776 : HeapTuple locTuple;
1777 : Form_pg_index indexform;
1778 : bool indisvalid;
1779 :
1780 0 : locTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(relOid));
1781 0 : if (!HeapTupleIsValid(locTuple))
1782 : {
1783 0 : ReleaseSysCache(tuple);
1784 0 : return;
1785 : }
1786 :
1787 0 : indexform = (Form_pg_index) GETSTRUCT(locTuple);
1788 0 : indisvalid = indexform->indisvalid;
1789 0 : ReleaseSysCache(locTuple);
1790 :
1791 : /* Mark object as being an invalid index of system catalogs */
1792 0 : if (!indisvalid)
1793 0 : invalid_system_index = true;
1794 : }
1795 :
1796 : /* In the case of an invalid index, it is fine to bypass this check */
1797 21034 : if (!invalid_system_index && !allowSystemTableMods && IsSystemClass(relOid, classform))
1798 2 : ereport(ERROR,
1799 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1800 : errmsg("permission denied: \"%s\" is a system catalog",
1801 : rel->relname)));
1802 :
1803 21032 : ReleaseSysCache(tuple);
1804 :
1805 : /*
1806 : * In DROP INDEX, attempt to acquire lock on the parent table before
1807 : * locking the index. index_drop() will need this anyway, and since
1808 : * regular queries lock tables before their indexes, we risk deadlock if
1809 : * we do it the other way around. No error if we don't find a pg_index
1810 : * entry, though --- the relation may have been dropped. Note that this
1811 : * code will execute for either plain or partitioned indexes.
1812 : */
1813 21032 : if (expected_relkind == RELKIND_INDEX &&
1814 : relOid != oldRelOid)
1815 : {
1816 880 : state->heapOid = IndexGetRelation(relOid, true);
1817 880 : if (OidIsValid(state->heapOid))
1818 880 : LockRelationOid(state->heapOid, heap_lockmode);
1819 : }
1820 :
1821 : /*
1822 : * Similarly, if the relation is a partition, we must acquire lock on its
1823 : * parent before locking the partition. That's because queries lock the
1824 : * parent before its partitions, so we risk deadlock if we do it the other
1825 : * way around.
1826 : */
1827 21032 : if (is_partition && relOid != oldRelOid)
1828 : {
1829 618 : state->partParentOid = get_partition_parent(relOid, true);
1830 618 : if (OidIsValid(state->partParentOid))
1831 618 : LockRelationOid(state->partParentOid, AccessExclusiveLock);
1832 : }
1833 : }
1834 :
1835 : /*
1836 : * ExecuteTruncate
1837 : * Executes a TRUNCATE command.
1838 : *
1839 : * This is a multi-relation truncate. We first open and grab exclusive
1840 : * lock on all relations involved, checking permissions and otherwise
1841 : * verifying that the relation is OK for truncation. Note that if relations
1842 : * are foreign tables, at this stage, we have not yet checked that their
1843 : * foreign data in external data sources are OK for truncation. These are
1844 : * checked when foreign data are actually truncated later. In CASCADE mode,
1845 : * relations having FK references to the targeted relations are automatically
1846 : * added to the group; in RESTRICT mode, we check that all FK references are
1847 : * internal to the group that's being truncated. Finally all the relations
1848 : * are truncated and reindexed.
1849 : */
1850 : void
1851 1764 : ExecuteTruncate(TruncateStmt *stmt)
1852 : {
1853 1764 : List *rels = NIL;
1854 1764 : List *relids = NIL;
1855 1764 : List *relids_logged = NIL;
1856 : ListCell *cell;
1857 :
1858 : /*
1859 : * Open, exclusive-lock, and check all the explicitly-specified relations
1860 : */
1861 3740 : foreach(cell, stmt->relations)
1862 : {
1863 2032 : RangeVar *rv = lfirst(cell);
1864 : Relation rel;
1865 2032 : bool recurse = rv->inh;
1866 : Oid myrelid;
1867 2032 : LOCKMODE lockmode = AccessExclusiveLock;
1868 :
1869 2032 : myrelid = RangeVarGetRelidExtended(rv, lockmode,
1870 : 0, RangeVarCallbackForTruncate,
1871 : NULL);
1872 :
1873 : /* don't throw error for "TRUNCATE foo, foo" */
1874 1994 : if (list_member_oid(relids, myrelid))
1875 2 : continue;
1876 :
1877 : /* open the relation, we already hold a lock on it */
1878 1992 : rel = table_open(myrelid, NoLock);
1879 :
1880 : /*
1881 : * RangeVarGetRelidExtended() has done most checks with its callback,
1882 : * but other checks with the now-opened Relation remain.
1883 : */
1884 1992 : truncate_check_activity(rel);
1885 :
1886 1986 : rels = lappend(rels, rel);
1887 1986 : relids = lappend_oid(relids, myrelid);
1888 :
1889 : /* Log this relation only if needed for logical decoding */
1890 1986 : if (RelationIsLogicallyLogged(rel))
1891 74 : relids_logged = lappend_oid(relids_logged, myrelid);
1892 :
1893 1986 : if (recurse)
1894 : {
1895 : ListCell *child;
1896 : List *children;
1897 :
1898 1932 : children = find_all_inheritors(myrelid, lockmode, NULL);
1899 :
1900 5668 : foreach(child, children)
1901 : {
1902 3736 : Oid childrelid = lfirst_oid(child);
1903 :
1904 3736 : if (list_member_oid(relids, childrelid))
1905 1932 : continue;
1906 :
1907 : /* find_all_inheritors already got lock */
1908 1804 : rel = table_open(childrelid, NoLock);
1909 :
1910 : /*
1911 : * It is possible that the parent table has children that are
1912 : * temp tables of other backends. We cannot safely access
1913 : * such tables (because of buffering issues), and the best
1914 : * thing to do is to silently ignore them. Note that this
1915 : * check is the same as one of the checks done in
1916 : * truncate_check_activity() called below, still it is kept
1917 : * here for simplicity.
1918 : */
1919 1804 : if (RELATION_IS_OTHER_TEMP(rel))
1920 : {
1921 8 : table_close(rel, lockmode);
1922 8 : continue;
1923 : }
1924 :
1925 : /*
1926 : * Inherited TRUNCATE commands perform access permission
1927 : * checks on the parent table only. So we skip checking the
1928 : * children's permissions and don't call
1929 : * truncate_check_perms() here.
1930 : */
1931 1796 : truncate_check_rel(RelationGetRelid(rel), rel->rd_rel);
1932 1796 : truncate_check_activity(rel);
1933 :
1934 1796 : rels = lappend(rels, rel);
1935 1796 : relids = lappend_oid(relids, childrelid);
1936 :
1937 : /* Log this relation only if needed for logical decoding */
1938 1796 : if (RelationIsLogicallyLogged(rel))
1939 22 : relids_logged = lappend_oid(relids_logged, childrelid);
1940 : }
1941 : }
1942 54 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1943 12 : ereport(ERROR,
1944 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1945 : errmsg("cannot truncate only a partitioned table"),
1946 : errhint("Do not specify the ONLY keyword, or use TRUNCATE ONLY on the partitions directly.")));
1947 : }
1948 :
1949 1708 : ExecuteTruncateGuts(rels, relids, relids_logged,
1950 1708 : stmt->behavior, stmt->restart_seqs, false);
1951 :
1952 : /* And close the rels */
1953 5242 : foreach(cell, rels)
1954 : {
1955 3616 : Relation rel = (Relation) lfirst(cell);
1956 :
1957 3616 : table_close(rel, NoLock);
1958 : }
1959 1626 : }
1960 :
1961 : /*
1962 : * ExecuteTruncateGuts
1963 : *
1964 : * Internal implementation of TRUNCATE. This is called by the actual TRUNCATE
1965 : * command (see above) as well as replication subscribers that execute a
1966 : * replicated TRUNCATE action.
1967 : *
1968 : * explicit_rels is the list of Relations to truncate that the command
1969 : * specified. relids is the list of Oids corresponding to explicit_rels.
1970 : * relids_logged is the list of Oids (a subset of relids) that require
1971 : * WAL-logging. This is all a bit redundant, but the existing callers have
1972 : * this information handy in this form.
1973 : */
1974 : void
1975 1748 : ExecuteTruncateGuts(List *explicit_rels,
1976 : List *relids,
1977 : List *relids_logged,
1978 : DropBehavior behavior, bool restart_seqs,
1979 : bool run_as_table_owner)
1980 : {
1981 : List *rels;
1982 1748 : List *seq_relids = NIL;
1983 1748 : HTAB *ft_htab = NULL;
1984 : EState *estate;
1985 : ResultRelInfo *resultRelInfos;
1986 : ResultRelInfo *resultRelInfo;
1987 : SubTransactionId mySubid;
1988 : ListCell *cell;
1989 : Oid *logrelids;
1990 :
1991 : /*
1992 : * Check the explicitly-specified relations.
1993 : *
1994 : * In CASCADE mode, suck in all referencing relations as well. This
1995 : * requires multiple iterations to find indirectly-dependent relations. At
1996 : * each phase, we need to exclusive-lock new rels before looking for their
1997 : * dependencies, else we might miss something. Also, we check each rel as
1998 : * soon as we open it, to avoid a faux pas such as holding lock for a long
1999 : * time on a rel we have no permissions for.
2000 : */
2001 1748 : rels = list_copy(explicit_rels);
2002 1748 : if (behavior == DROP_CASCADE)
2003 : {
2004 : for (;;)
2005 40 : {
2006 : List *newrelids;
2007 :
2008 80 : newrelids = heap_truncate_find_FKs(relids);
2009 80 : if (newrelids == NIL)
2010 40 : break; /* nothing else to add */
2011 :
2012 134 : foreach(cell, newrelids)
2013 : {
2014 94 : Oid relid = lfirst_oid(cell);
2015 : Relation rel;
2016 :
2017 94 : rel = table_open(relid, AccessExclusiveLock);
2018 94 : ereport(NOTICE,
2019 : (errmsg("truncate cascades to table \"%s\"",
2020 : RelationGetRelationName(rel))));
2021 94 : truncate_check_rel(relid, rel->rd_rel);
2022 94 : truncate_check_perms(relid, rel->rd_rel);
2023 94 : truncate_check_activity(rel);
2024 94 : rels = lappend(rels, rel);
2025 94 : relids = lappend_oid(relids, relid);
2026 :
2027 : /* Log this relation only if needed for logical decoding */
2028 94 : if (RelationIsLogicallyLogged(rel))
2029 0 : relids_logged = lappend_oid(relids_logged, relid);
2030 : }
2031 : }
2032 : }
2033 :
2034 : /*
2035 : * Check foreign key references. In CASCADE mode, this should be
2036 : * unnecessary since we just pulled in all the references; but as a
2037 : * cross-check, do it anyway if in an Assert-enabled build.
2038 : */
2039 : #ifdef USE_ASSERT_CHECKING
2040 : heap_truncate_check_FKs(rels, false);
2041 : #else
2042 1748 : if (behavior == DROP_RESTRICT)
2043 1708 : heap_truncate_check_FKs(rels, false);
2044 : #endif
2045 :
2046 : /*
2047 : * If we are asked to restart sequences, find all the sequences, lock them
2048 : * (we need AccessExclusiveLock for ResetSequence), and check permissions.
2049 : * We want to do this early since it's pointless to do all the truncation
2050 : * work only to fail on sequence permissions.
2051 : */
2052 1674 : if (restart_seqs)
2053 : {
2054 48 : foreach(cell, rels)
2055 : {
2056 24 : Relation rel = (Relation) lfirst(cell);
2057 24 : List *seqlist = getOwnedSequences(RelationGetRelid(rel));
2058 : ListCell *seqcell;
2059 :
2060 58 : foreach(seqcell, seqlist)
2061 : {
2062 34 : Oid seq_relid = lfirst_oid(seqcell);
2063 : Relation seq_rel;
2064 :
2065 34 : seq_rel = relation_open(seq_relid, AccessExclusiveLock);
2066 :
2067 : /* This check must match AlterSequence! */
2068 34 : if (!object_ownercheck(RelationRelationId, seq_relid, GetUserId()))
2069 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SEQUENCE,
2070 0 : RelationGetRelationName(seq_rel));
2071 :
2072 34 : seq_relids = lappend_oid(seq_relids, seq_relid);
2073 :
2074 34 : relation_close(seq_rel, NoLock);
2075 : }
2076 : }
2077 : }
2078 :
2079 : /* Prepare to catch AFTER triggers. */
2080 1674 : AfterTriggerBeginQuery();
2081 :
2082 : /*
2083 : * To fire triggers, we'll need an EState as well as a ResultRelInfo for
2084 : * each relation. We don't need to call ExecOpenIndices, though.
2085 : *
2086 : * We put the ResultRelInfos in the es_opened_result_relations list, even
2087 : * though we don't have a range table and don't populate the
2088 : * es_result_relations array. That's a bit bogus, but it's enough to make
2089 : * ExecGetTriggerResultRel() find them.
2090 : */
2091 1674 : estate = CreateExecutorState();
2092 : resultRelInfos = (ResultRelInfo *)
2093 1674 : palloc(list_length(rels) * sizeof(ResultRelInfo));
2094 1674 : resultRelInfo = resultRelInfos;
2095 5464 : foreach(cell, rels)
2096 : {
2097 3790 : Relation rel = (Relation) lfirst(cell);
2098 :
2099 3790 : InitResultRelInfo(resultRelInfo,
2100 : rel,
2101 : 0, /* dummy rangetable index */
2102 : NULL,
2103 : 0);
2104 3790 : estate->es_opened_result_relations =
2105 3790 : lappend(estate->es_opened_result_relations, resultRelInfo);
2106 3790 : resultRelInfo++;
2107 : }
2108 :
2109 : /*
2110 : * Process all BEFORE STATEMENT TRUNCATE triggers before we begin
2111 : * truncating (this is because one of them might throw an error). Also, if
2112 : * we were to allow them to prevent statement execution, that would need
2113 : * to be handled here.
2114 : */
2115 1674 : resultRelInfo = resultRelInfos;
2116 5464 : foreach(cell, rels)
2117 : {
2118 : UserContext ucxt;
2119 :
2120 3790 : if (run_as_table_owner)
2121 72 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2122 : &ucxt);
2123 3790 : ExecBSTruncateTriggers(estate, resultRelInfo);
2124 3790 : if (run_as_table_owner)
2125 72 : RestoreUserContext(&ucxt);
2126 3790 : resultRelInfo++;
2127 : }
2128 :
2129 : /*
2130 : * OK, truncate each table.
2131 : */
2132 1674 : mySubid = GetCurrentSubTransactionId();
2133 :
2134 5464 : foreach(cell, rels)
2135 : {
2136 3790 : Relation rel = (Relation) lfirst(cell);
2137 :
2138 : /* Skip partitioned tables as there is nothing to do */
2139 3790 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
2140 704 : continue;
2141 :
2142 : /*
2143 : * Build the lists of foreign tables belonging to each foreign server
2144 : * and pass each list to the foreign data wrapper's callback function,
2145 : * so that each server can truncate its all foreign tables in bulk.
2146 : * Each list is saved as a single entry in a hash table that uses the
2147 : * server OID as lookup key.
2148 : */
2149 3086 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
2150 34 : {
2151 34 : Oid serverid = GetForeignServerIdByRelId(RelationGetRelid(rel));
2152 : bool found;
2153 : ForeignTruncateInfo *ft_info;
2154 :
2155 : /* First time through, initialize hashtable for foreign tables */
2156 34 : if (!ft_htab)
2157 : {
2158 : HASHCTL hctl;
2159 :
2160 30 : memset(&hctl, 0, sizeof(HASHCTL));
2161 30 : hctl.keysize = sizeof(Oid);
2162 30 : hctl.entrysize = sizeof(ForeignTruncateInfo);
2163 30 : hctl.hcxt = CurrentMemoryContext;
2164 :
2165 30 : ft_htab = hash_create("TRUNCATE for Foreign Tables",
2166 : 32, /* start small and extend */
2167 : &hctl,
2168 : HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
2169 : }
2170 :
2171 : /* Find or create cached entry for the foreign table */
2172 34 : ft_info = hash_search(ft_htab, &serverid, HASH_ENTER, &found);
2173 34 : if (!found)
2174 30 : ft_info->rels = NIL;
2175 :
2176 : /*
2177 : * Save the foreign table in the entry of the server that the
2178 : * foreign table belongs to.
2179 : */
2180 34 : ft_info->rels = lappend(ft_info->rels, rel);
2181 34 : continue;
2182 : }
2183 :
2184 : /*
2185 : * Normally, we need a transaction-safe truncation here. However, if
2186 : * the table was either created in the current (sub)transaction or has
2187 : * a new relfilenumber in the current (sub)transaction, then we can
2188 : * just truncate it in-place, because a rollback would cause the whole
2189 : * table or the current physical file to be thrown away anyway.
2190 : */
2191 3052 : if (rel->rd_createSubid == mySubid ||
2192 3026 : rel->rd_newRelfilelocatorSubid == mySubid)
2193 : {
2194 : /* Immediate, non-rollbackable truncation is OK */
2195 90 : heap_truncate_one_rel(rel);
2196 : }
2197 : else
2198 : {
2199 : Oid heap_relid;
2200 : Oid toast_relid;
2201 2962 : ReindexParams reindex_params = {0};
2202 :
2203 : /*
2204 : * This effectively deletes all rows in the table, and may be done
2205 : * in a serializable transaction. In that case we must record a
2206 : * rw-conflict in to this transaction from each transaction
2207 : * holding a predicate lock on the table.
2208 : */
2209 2962 : CheckTableForSerializableConflictIn(rel);
2210 :
2211 : /*
2212 : * Need the full transaction-safe pushups.
2213 : *
2214 : * Create a new empty storage file for the relation, and assign it
2215 : * as the relfilenumber value. The old storage file is scheduled
2216 : * for deletion at commit.
2217 : */
2218 2962 : RelationSetNewRelfilenumber(rel, rel->rd_rel->relpersistence);
2219 :
2220 2962 : heap_relid = RelationGetRelid(rel);
2221 :
2222 : /*
2223 : * The same for the toast table, if any.
2224 : */
2225 2962 : toast_relid = rel->rd_rel->reltoastrelid;
2226 2962 : if (OidIsValid(toast_relid))
2227 : {
2228 1784 : Relation toastrel = relation_open(toast_relid,
2229 : AccessExclusiveLock);
2230 :
2231 1784 : RelationSetNewRelfilenumber(toastrel,
2232 1784 : toastrel->rd_rel->relpersistence);
2233 1784 : table_close(toastrel, NoLock);
2234 : }
2235 :
2236 : /*
2237 : * Reconstruct the indexes to match, and we're done.
2238 : */
2239 2962 : reindex_relation(NULL, heap_relid, REINDEX_REL_PROCESS_TOAST,
2240 : &reindex_params);
2241 : }
2242 :
2243 3052 : pgstat_count_truncate(rel);
2244 : }
2245 :
2246 : /* Now go through the hash table, and truncate foreign tables */
2247 1674 : if (ft_htab)
2248 : {
2249 : ForeignTruncateInfo *ft_info;
2250 : HASH_SEQ_STATUS seq;
2251 :
2252 30 : hash_seq_init(&seq, ft_htab);
2253 :
2254 30 : PG_TRY();
2255 : {
2256 52 : while ((ft_info = hash_seq_search(&seq)) != NULL)
2257 : {
2258 30 : FdwRoutine *routine = GetFdwRoutineByServerId(ft_info->serverid);
2259 :
2260 : /* truncate_check_rel() has checked that already */
2261 : Assert(routine->ExecForeignTruncate != NULL);
2262 :
2263 30 : routine->ExecForeignTruncate(ft_info->rels,
2264 : behavior,
2265 : restart_seqs);
2266 : }
2267 : }
2268 8 : PG_FINALLY();
2269 : {
2270 30 : hash_destroy(ft_htab);
2271 : }
2272 30 : PG_END_TRY();
2273 : }
2274 :
2275 : /*
2276 : * Restart owned sequences if we were asked to.
2277 : */
2278 1700 : foreach(cell, seq_relids)
2279 : {
2280 34 : Oid seq_relid = lfirst_oid(cell);
2281 :
2282 34 : ResetSequence(seq_relid);
2283 : }
2284 :
2285 : /*
2286 : * Write a WAL record to allow this set of actions to be logically
2287 : * decoded.
2288 : *
2289 : * Assemble an array of relids so we can write a single WAL record for the
2290 : * whole action.
2291 : */
2292 1666 : if (relids_logged != NIL)
2293 : {
2294 : xl_heap_truncate xlrec;
2295 62 : int i = 0;
2296 :
2297 : /* should only get here if wal_level >= logical */
2298 : Assert(XLogLogicalInfoActive());
2299 :
2300 62 : logrelids = palloc(list_length(relids_logged) * sizeof(Oid));
2301 160 : foreach(cell, relids_logged)
2302 98 : logrelids[i++] = lfirst_oid(cell);
2303 :
2304 62 : xlrec.dbId = MyDatabaseId;
2305 62 : xlrec.nrelids = list_length(relids_logged);
2306 62 : xlrec.flags = 0;
2307 62 : if (behavior == DROP_CASCADE)
2308 2 : xlrec.flags |= XLH_TRUNCATE_CASCADE;
2309 62 : if (restart_seqs)
2310 4 : xlrec.flags |= XLH_TRUNCATE_RESTART_SEQS;
2311 :
2312 62 : XLogBeginInsert();
2313 62 : XLogRegisterData(&xlrec, SizeOfHeapTruncate);
2314 62 : XLogRegisterData(logrelids, list_length(relids_logged) * sizeof(Oid));
2315 :
2316 62 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
2317 :
2318 62 : (void) XLogInsert(RM_HEAP_ID, XLOG_HEAP_TRUNCATE);
2319 : }
2320 :
2321 : /*
2322 : * Process all AFTER STATEMENT TRUNCATE triggers.
2323 : */
2324 1666 : resultRelInfo = resultRelInfos;
2325 5448 : foreach(cell, rels)
2326 : {
2327 : UserContext ucxt;
2328 :
2329 3782 : if (run_as_table_owner)
2330 72 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2331 : &ucxt);
2332 3782 : ExecASTruncateTriggers(estate, resultRelInfo);
2333 3782 : if (run_as_table_owner)
2334 72 : RestoreUserContext(&ucxt);
2335 3782 : resultRelInfo++;
2336 : }
2337 :
2338 : /* Handle queued AFTER triggers */
2339 1666 : AfterTriggerEndQuery(estate);
2340 :
2341 : /* We can clean up the EState now */
2342 1666 : FreeExecutorState(estate);
2343 :
2344 : /*
2345 : * Close any rels opened by CASCADE (can't do this while EState still
2346 : * holds refs)
2347 : */
2348 1666 : rels = list_difference_ptr(rels, explicit_rels);
2349 1760 : foreach(cell, rels)
2350 : {
2351 94 : Relation rel = (Relation) lfirst(cell);
2352 :
2353 94 : table_close(rel, NoLock);
2354 : }
2355 1666 : }
2356 :
2357 : /*
2358 : * Check that a given relation is safe to truncate. Subroutine for
2359 : * ExecuteTruncate() and RangeVarCallbackForTruncate().
2360 : */
2361 : static void
2362 4056 : truncate_check_rel(Oid relid, Form_pg_class reltuple)
2363 : {
2364 4056 : char *relname = NameStr(reltuple->relname);
2365 :
2366 : /*
2367 : * Only allow truncate on regular tables, foreign tables using foreign
2368 : * data wrappers supporting TRUNCATE and partitioned tables (although, the
2369 : * latter are only being included here for the following checks; no
2370 : * physical truncation will occur in their case.).
2371 : */
2372 4056 : if (reltuple->relkind == RELKIND_FOREIGN_TABLE)
2373 : {
2374 38 : Oid serverid = GetForeignServerIdByRelId(relid);
2375 38 : FdwRoutine *fdwroutine = GetFdwRoutineByServerId(serverid);
2376 :
2377 36 : if (!fdwroutine->ExecForeignTruncate)
2378 2 : ereport(ERROR,
2379 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2380 : errmsg("cannot truncate foreign table \"%s\"",
2381 : relname)));
2382 : }
2383 4018 : else if (reltuple->relkind != RELKIND_RELATION &&
2384 726 : reltuple->relkind != RELKIND_PARTITIONED_TABLE)
2385 0 : ereport(ERROR,
2386 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2387 : errmsg("\"%s\" is not a table", relname)));
2388 :
2389 : /*
2390 : * Most system catalogs can't be truncated at all, or at least not unless
2391 : * allow_system_table_mods=on. As an exception, however, we allow
2392 : * pg_largeobject and pg_largeobject_metadata to be truncated as part of
2393 : * pg_upgrade, because we need to change its relfilenode to match the old
2394 : * cluster, and allowing a TRUNCATE command to be executed is the easiest
2395 : * way of doing that.
2396 : */
2397 4052 : if (!allowSystemTableMods && IsSystemClass(relid, reltuple)
2398 114 : && (!IsBinaryUpgrade ||
2399 56 : (relid != LargeObjectRelationId &&
2400 : relid != LargeObjectMetadataRelationId)))
2401 2 : ereport(ERROR,
2402 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
2403 : errmsg("permission denied: \"%s\" is a system catalog",
2404 : relname)));
2405 :
2406 4050 : InvokeObjectTruncateHook(relid);
2407 4050 : }
2408 :
2409 : /*
2410 : * Check that current user has the permission to truncate given relation.
2411 : */
2412 : static void
2413 2254 : truncate_check_perms(Oid relid, Form_pg_class reltuple)
2414 : {
2415 2254 : char *relname = NameStr(reltuple->relname);
2416 : AclResult aclresult;
2417 :
2418 : /* Permissions checks */
2419 2254 : aclresult = pg_class_aclcheck(relid, GetUserId(), ACL_TRUNCATE);
2420 2254 : if (aclresult != ACLCHECK_OK)
2421 32 : aclcheck_error(aclresult, get_relkind_objtype(reltuple->relkind),
2422 : relname);
2423 2222 : }
2424 :
2425 : /*
2426 : * Set of extra sanity checks to check if a given relation is safe to
2427 : * truncate. This is split with truncate_check_rel() as
2428 : * RangeVarCallbackForTruncate() cannot open a Relation yet.
2429 : */
2430 : static void
2431 3882 : truncate_check_activity(Relation rel)
2432 : {
2433 : /*
2434 : * Don't allow truncate on temp tables of other backends ... their local
2435 : * buffer manager is not going to cope.
2436 : */
2437 3882 : if (RELATION_IS_OTHER_TEMP(rel))
2438 0 : ereport(ERROR,
2439 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2440 : errmsg("cannot truncate temporary tables of other sessions")));
2441 :
2442 : /*
2443 : * Also check for active uses of the relation in the current transaction,
2444 : * including open scans and pending AFTER trigger events.
2445 : */
2446 3882 : CheckTableNotInUse(rel, "TRUNCATE");
2447 3876 : }
2448 :
2449 : /*
2450 : * storage_name
2451 : * returns the name corresponding to a typstorage/attstorage enum value
2452 : */
2453 : static const char *
2454 24 : storage_name(char c)
2455 : {
2456 24 : switch (c)
2457 : {
2458 0 : case TYPSTORAGE_PLAIN:
2459 0 : return "PLAIN";
2460 0 : case TYPSTORAGE_EXTERNAL:
2461 0 : return "EXTERNAL";
2462 12 : case TYPSTORAGE_EXTENDED:
2463 12 : return "EXTENDED";
2464 12 : case TYPSTORAGE_MAIN:
2465 12 : return "MAIN";
2466 0 : default:
2467 0 : return "???";
2468 : }
2469 : }
2470 :
2471 : /*----------
2472 : * MergeAttributes
2473 : * Returns new schema given initial schema and superclasses.
2474 : *
2475 : * Input arguments:
2476 : * 'columns' is the column/attribute definition for the table. (It's a list
2477 : * of ColumnDef's.) It is destructively changed.
2478 : * 'supers' is a list of OIDs of parent relations, already locked by caller.
2479 : * 'relpersistence' is the persistence type of the table.
2480 : * 'is_partition' tells if the table is a partition.
2481 : *
2482 : * Output arguments:
2483 : * 'supconstr' receives a list of CookedConstraint representing
2484 : * CHECK constraints belonging to parent relations, updated as
2485 : * necessary to be valid for the child.
2486 : * 'supnotnulls' receives a list of CookedConstraint representing
2487 : * not-null constraints based on those from parent relations.
2488 : *
2489 : * Return value:
2490 : * Completed schema list.
2491 : *
2492 : * Notes:
2493 : * The order in which the attributes are inherited is very important.
2494 : * Intuitively, the inherited attributes should come first. If a table
2495 : * inherits from multiple parents, the order of those attributes are
2496 : * according to the order of the parents specified in CREATE TABLE.
2497 : *
2498 : * Here's an example:
2499 : *
2500 : * create table person (name text, age int4, location point);
2501 : * create table emp (salary int4, manager text) inherits(person);
2502 : * create table student (gpa float8) inherits (person);
2503 : * create table stud_emp (percent int4) inherits (emp, student);
2504 : *
2505 : * The order of the attributes of stud_emp is:
2506 : *
2507 : * person {1:name, 2:age, 3:location}
2508 : * / \
2509 : * {6:gpa} student emp {4:salary, 5:manager}
2510 : * \ /
2511 : * stud_emp {7:percent}
2512 : *
2513 : * If the same attribute name appears multiple times, then it appears
2514 : * in the result table in the proper location for its first appearance.
2515 : *
2516 : * Constraints (including not-null constraints) for the child table
2517 : * are the union of all relevant constraints, from both the child schema
2518 : * and parent tables. In addition, in legacy inheritance, each column that
2519 : * appears in a primary key in any of the parents also gets a NOT NULL
2520 : * constraint (partitioning doesn't need this, because the PK itself gets
2521 : * inherited.)
2522 : *
2523 : * The default value for a child column is defined as:
2524 : * (1) If the child schema specifies a default, that value is used.
2525 : * (2) If neither the child nor any parent specifies a default, then
2526 : * the column will not have a default.
2527 : * (3) If conflicting defaults are inherited from different parents
2528 : * (and not overridden by the child), an error is raised.
2529 : * (4) Otherwise the inherited default is used.
2530 : *
2531 : * Note that the default-value infrastructure is used for generated
2532 : * columns' expressions too, so most of the preceding paragraph applies
2533 : * to generation expressions too. We insist that a child column be
2534 : * generated if and only if its parent(s) are, but it need not have
2535 : * the same generation expression.
2536 : *----------
2537 : */
2538 : static List *
2539 63008 : MergeAttributes(List *columns, const List *supers, char relpersistence,
2540 : bool is_partition, List **supconstr, List **supnotnulls)
2541 : {
2542 63008 : List *inh_columns = NIL;
2543 63008 : List *constraints = NIL;
2544 63008 : List *nnconstraints = NIL;
2545 63008 : bool have_bogus_defaults = false;
2546 : int child_attno;
2547 : static Node bogus_marker = {0}; /* marks conflicting defaults */
2548 63008 : List *saved_columns = NIL;
2549 : ListCell *lc;
2550 :
2551 : /*
2552 : * Check for and reject tables with too many columns. We perform this
2553 : * check relatively early for two reasons: (a) we don't run the risk of
2554 : * overflowing an AttrNumber in subsequent code (b) an O(n^2) algorithm is
2555 : * okay if we're processing <= 1600 columns, but could take minutes to
2556 : * execute if the user attempts to create a table with hundreds of
2557 : * thousands of columns.
2558 : *
2559 : * Note that we also need to check that we do not exceed this figure after
2560 : * including columns from inherited relations.
2561 : */
2562 63008 : if (list_length(columns) > MaxHeapAttributeNumber)
2563 0 : ereport(ERROR,
2564 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
2565 : errmsg("tables can have at most %d columns",
2566 : MaxHeapAttributeNumber)));
2567 :
2568 : /*
2569 : * Check for duplicate names in the explicit list of attributes.
2570 : *
2571 : * Although we might consider merging such entries in the same way that we
2572 : * handle name conflicts for inherited attributes, it seems to make more
2573 : * sense to assume such conflicts are errors.
2574 : *
2575 : * We don't use foreach() here because we have two nested loops over the
2576 : * columns list, with possible element deletions in the inner one. If we
2577 : * used foreach_delete_current() it could only fix up the state of one of
2578 : * the loops, so it seems cleaner to use looping over list indexes for
2579 : * both loops. Note that any deletion will happen beyond where the outer
2580 : * loop is, so its index never needs adjustment.
2581 : */
2582 299322 : for (int coldefpos = 0; coldefpos < list_length(columns); coldefpos++)
2583 : {
2584 236338 : ColumnDef *coldef = list_nth_node(ColumnDef, columns, coldefpos);
2585 :
2586 236338 : if (!is_partition && coldef->typeName == NULL)
2587 : {
2588 : /*
2589 : * Typed table column option that does not belong to a column from
2590 : * the type. This works because the columns from the type come
2591 : * first in the list. (We omit this check for partition column
2592 : * lists; those are processed separately below.)
2593 : */
2594 6 : ereport(ERROR,
2595 : (errcode(ERRCODE_UNDEFINED_COLUMN),
2596 : errmsg("column \"%s\" does not exist",
2597 : coldef->colname)));
2598 : }
2599 :
2600 : /* restpos scans all entries beyond coldef; incr is in loop body */
2601 6585914 : for (int restpos = coldefpos + 1; restpos < list_length(columns);)
2602 : {
2603 6349600 : ColumnDef *restdef = list_nth_node(ColumnDef, columns, restpos);
2604 :
2605 6349600 : if (strcmp(coldef->colname, restdef->colname) == 0)
2606 : {
2607 50 : if (coldef->is_from_type)
2608 : {
2609 : /*
2610 : * merge the column options into the column from the type
2611 : */
2612 32 : coldef->is_not_null = restdef->is_not_null;
2613 32 : coldef->raw_default = restdef->raw_default;
2614 32 : coldef->cooked_default = restdef->cooked_default;
2615 32 : coldef->constraints = restdef->constraints;
2616 32 : coldef->is_from_type = false;
2617 32 : columns = list_delete_nth_cell(columns, restpos);
2618 : }
2619 : else
2620 18 : ereport(ERROR,
2621 : (errcode(ERRCODE_DUPLICATE_COLUMN),
2622 : errmsg("column \"%s\" specified more than once",
2623 : coldef->colname)));
2624 : }
2625 : else
2626 6349550 : restpos++;
2627 : }
2628 : }
2629 :
2630 : /*
2631 : * In case of a partition, there are no new column definitions, only dummy
2632 : * ColumnDefs created for column constraints. Set them aside for now and
2633 : * process them at the end.
2634 : */
2635 62984 : if (is_partition)
2636 : {
2637 8168 : saved_columns = columns;
2638 8168 : columns = NIL;
2639 : }
2640 :
2641 : /*
2642 : * Scan the parents left-to-right, and merge their attributes to form a
2643 : * list of inherited columns (inh_columns).
2644 : */
2645 62984 : child_attno = 0;
2646 73582 : foreach(lc, supers)
2647 : {
2648 10682 : Oid parent = lfirst_oid(lc);
2649 : Relation relation;
2650 : TupleDesc tupleDesc;
2651 : TupleConstr *constr;
2652 : AttrMap *newattmap;
2653 : List *inherited_defaults;
2654 : List *cols_with_defaults;
2655 : List *nnconstrs;
2656 : ListCell *lc1;
2657 : ListCell *lc2;
2658 10682 : Bitmapset *nncols = NULL;
2659 :
2660 : /* caller already got lock */
2661 10682 : relation = table_open(parent, NoLock);
2662 :
2663 : /*
2664 : * Check for active uses of the parent partitioned table in the
2665 : * current transaction, such as being used in some manner by an
2666 : * enclosing command.
2667 : */
2668 10682 : if (is_partition)
2669 8168 : CheckTableNotInUse(relation, "CREATE TABLE .. PARTITION OF");
2670 :
2671 : /*
2672 : * We do not allow partitioned tables and partitions to participate in
2673 : * regular inheritance.
2674 : */
2675 10676 : if (relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !is_partition)
2676 6 : ereport(ERROR,
2677 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2678 : errmsg("cannot inherit from partitioned table \"%s\"",
2679 : RelationGetRelationName(relation))));
2680 10670 : if (relation->rd_rel->relispartition && !is_partition)
2681 6 : ereport(ERROR,
2682 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2683 : errmsg("cannot inherit from partition \"%s\"",
2684 : RelationGetRelationName(relation))));
2685 :
2686 10664 : if (relation->rd_rel->relkind != RELKIND_RELATION &&
2687 8164 : relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2688 8144 : relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2689 0 : ereport(ERROR,
2690 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2691 : errmsg("inherited relation \"%s\" is not a table or foreign table",
2692 : RelationGetRelationName(relation))));
2693 :
2694 : /*
2695 : * If the parent is permanent, so must be all of its partitions. Note
2696 : * that inheritance allows that case.
2697 : */
2698 10664 : if (is_partition &&
2699 8162 : relation->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
2700 : relpersistence == RELPERSISTENCE_TEMP)
2701 6 : ereport(ERROR,
2702 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2703 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
2704 : RelationGetRelationName(relation))));
2705 :
2706 : /* Permanent rels cannot inherit from temporary ones */
2707 10658 : if (relpersistence != RELPERSISTENCE_TEMP &&
2708 10292 : relation->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
2709 24 : ereport(ERROR,
2710 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2711 : errmsg(!is_partition
2712 : ? "cannot inherit from temporary relation \"%s\""
2713 : : "cannot create a permanent relation as partition of temporary relation \"%s\"",
2714 : RelationGetRelationName(relation))));
2715 :
2716 : /* If existing rel is temp, it must belong to this session */
2717 10634 : if (RELATION_IS_OTHER_TEMP(relation))
2718 0 : ereport(ERROR,
2719 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2720 : errmsg(!is_partition
2721 : ? "cannot inherit from temporary relation of another session"
2722 : : "cannot create as partition of temporary relation of another session")));
2723 :
2724 : /*
2725 : * We should have an UNDER permission flag for this, but for now,
2726 : * demand that creator of a child table own the parent.
2727 : */
2728 10634 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(relation), GetUserId()))
2729 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(relation->rd_rel->relkind),
2730 0 : RelationGetRelationName(relation));
2731 :
2732 10634 : tupleDesc = RelationGetDescr(relation);
2733 10634 : constr = tupleDesc->constr;
2734 :
2735 : /*
2736 : * newattmap->attnums[] will contain the child-table attribute numbers
2737 : * for the attributes of this parent table. (They are not the same
2738 : * for parents after the first one, nor if we have dropped columns.)
2739 : */
2740 10634 : newattmap = make_attrmap(tupleDesc->natts);
2741 :
2742 : /* We can't process inherited defaults until newattmap is complete. */
2743 10634 : inherited_defaults = cols_with_defaults = NIL;
2744 :
2745 : /*
2746 : * Request attnotnull on columns that have a not-null constraint
2747 : * that's not marked NO INHERIT (even if not valid).
2748 : */
2749 10634 : nnconstrs = RelationGetNotNullConstraints(RelationGetRelid(relation),
2750 : true, false);
2751 23662 : foreach_ptr(CookedConstraint, cc, nnconstrs)
2752 2394 : nncols = bms_add_member(nncols, cc->attnum);
2753 :
2754 32048 : for (AttrNumber parent_attno = 1; parent_attno <= tupleDesc->natts;
2755 21414 : parent_attno++)
2756 : {
2757 21450 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
2758 : parent_attno - 1);
2759 21450 : char *attributeName = NameStr(attribute->attname);
2760 : int exist_attno;
2761 : ColumnDef *newdef;
2762 : ColumnDef *mergeddef;
2763 :
2764 : /*
2765 : * Ignore dropped columns in the parent.
2766 : */
2767 21450 : if (attribute->attisdropped)
2768 198 : continue; /* leave newattmap->attnums entry as zero */
2769 :
2770 : /*
2771 : * Create new column definition
2772 : */
2773 21252 : newdef = makeColumnDef(attributeName, attribute->atttypid,
2774 : attribute->atttypmod, attribute->attcollation);
2775 21252 : newdef->storage = attribute->attstorage;
2776 21252 : newdef->generated = attribute->attgenerated;
2777 21252 : if (CompressionMethodIsValid(attribute->attcompression))
2778 36 : newdef->compression =
2779 36 : pstrdup(GetCompressionMethodName(attribute->attcompression));
2780 :
2781 : /*
2782 : * Regular inheritance children are independent enough not to
2783 : * inherit identity columns. But partitions are integral part of
2784 : * a partitioned table and inherit identity column.
2785 : */
2786 21252 : if (is_partition)
2787 16642 : newdef->identity = attribute->attidentity;
2788 :
2789 : /*
2790 : * Does it match some previously considered column from another
2791 : * parent?
2792 : */
2793 21252 : exist_attno = findAttrByName(attributeName, inh_columns);
2794 21252 : if (exist_attno > 0)
2795 : {
2796 : /*
2797 : * Yes, try to merge the two column definitions.
2798 : */
2799 370 : mergeddef = MergeInheritedAttribute(inh_columns, exist_attno, newdef);
2800 :
2801 334 : newattmap->attnums[parent_attno - 1] = exist_attno;
2802 :
2803 : /*
2804 : * Partitions have only one parent, so conflict should never
2805 : * occur.
2806 : */
2807 : Assert(!is_partition);
2808 : }
2809 : else
2810 : {
2811 : /*
2812 : * No, create a new inherited column
2813 : */
2814 20882 : newdef->inhcount = 1;
2815 20882 : newdef->is_local = false;
2816 20882 : inh_columns = lappend(inh_columns, newdef);
2817 :
2818 20882 : newattmap->attnums[parent_attno - 1] = ++child_attno;
2819 20882 : mergeddef = newdef;
2820 : }
2821 :
2822 : /*
2823 : * mark attnotnull if parent has it
2824 : */
2825 21216 : if (bms_is_member(parent_attno, nncols))
2826 2394 : mergeddef->is_not_null = true;
2827 :
2828 : /*
2829 : * Locate default/generation expression if any
2830 : */
2831 21216 : if (attribute->atthasdef)
2832 : {
2833 : Node *this_default;
2834 :
2835 716 : this_default = TupleDescGetDefault(tupleDesc, parent_attno);
2836 716 : if (this_default == NULL)
2837 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
2838 : parent_attno, RelationGetRelationName(relation));
2839 :
2840 : /*
2841 : * If it's a GENERATED default, it might contain Vars that
2842 : * need to be mapped to the inherited column(s)' new numbers.
2843 : * We can't do that till newattmap is ready, so just remember
2844 : * all the inherited default expressions for the moment.
2845 : */
2846 716 : inherited_defaults = lappend(inherited_defaults, this_default);
2847 716 : cols_with_defaults = lappend(cols_with_defaults, mergeddef);
2848 : }
2849 : }
2850 :
2851 : /*
2852 : * Now process any inherited default expressions, adjusting attnos
2853 : * using the completed newattmap map.
2854 : */
2855 11314 : forboth(lc1, inherited_defaults, lc2, cols_with_defaults)
2856 : {
2857 716 : Node *this_default = (Node *) lfirst(lc1);
2858 716 : ColumnDef *def = (ColumnDef *) lfirst(lc2);
2859 : bool found_whole_row;
2860 :
2861 : /* Adjust Vars to match new table's column numbering */
2862 716 : this_default = map_variable_attnos(this_default,
2863 : 1, 0,
2864 : newattmap,
2865 : InvalidOid, &found_whole_row);
2866 :
2867 : /*
2868 : * For the moment we have to reject whole-row variables. We could
2869 : * convert them, if we knew the new table's rowtype OID, but that
2870 : * hasn't been assigned yet. (A variable could only appear in a
2871 : * generation expression, so the error message is correct.)
2872 : */
2873 716 : if (found_whole_row)
2874 0 : ereport(ERROR,
2875 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2876 : errmsg("cannot convert whole-row table reference"),
2877 : errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
2878 : def->colname,
2879 : RelationGetRelationName(relation))));
2880 :
2881 : /*
2882 : * If we already had a default from some prior parent, check to
2883 : * see if they are the same. If so, no problem; if not, mark the
2884 : * column as having a bogus default. Below, we will complain if
2885 : * the bogus default isn't overridden by the child columns.
2886 : */
2887 : Assert(def->raw_default == NULL);
2888 716 : if (def->cooked_default == NULL)
2889 674 : def->cooked_default = this_default;
2890 42 : else if (!equal(def->cooked_default, this_default))
2891 : {
2892 36 : def->cooked_default = &bogus_marker;
2893 36 : have_bogus_defaults = true;
2894 : }
2895 : }
2896 :
2897 : /*
2898 : * Now copy the CHECK constraints of this parent, adjusting attnos
2899 : * using the completed newattmap map. Identically named constraints
2900 : * are merged if possible, else we throw error.
2901 : */
2902 10598 : if (constr && constr->num_check > 0)
2903 : {
2904 334 : ConstrCheck *check = constr->check;
2905 :
2906 1070 : for (int i = 0; i < constr->num_check; i++)
2907 : {
2908 736 : char *name = check[i].ccname;
2909 : Node *expr;
2910 : bool found_whole_row;
2911 :
2912 : /* ignore if the constraint is non-inheritable */
2913 736 : if (check[i].ccnoinherit)
2914 48 : continue;
2915 :
2916 : /* Adjust Vars to match new table's column numbering */
2917 688 : expr = map_variable_attnos(stringToNode(check[i].ccbin),
2918 : 1, 0,
2919 : newattmap,
2920 : InvalidOid, &found_whole_row);
2921 :
2922 : /*
2923 : * For the moment we have to reject whole-row variables. We
2924 : * could convert them, if we knew the new table's rowtype OID,
2925 : * but that hasn't been assigned yet.
2926 : */
2927 688 : if (found_whole_row)
2928 0 : ereport(ERROR,
2929 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2930 : errmsg("cannot convert whole-row table reference"),
2931 : errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
2932 : name,
2933 : RelationGetRelationName(relation))));
2934 :
2935 688 : constraints = MergeCheckConstraint(constraints, name, expr,
2936 688 : check[i].ccenforced);
2937 : }
2938 : }
2939 :
2940 : /*
2941 : * Also copy the not-null constraints from this parent. The
2942 : * attnotnull markings were already installed above.
2943 : */
2944 23590 : foreach_ptr(CookedConstraint, nn, nnconstrs)
2945 : {
2946 : Assert(nn->contype == CONSTR_NOTNULL);
2947 :
2948 2394 : nn->attnum = newattmap->attnums[nn->attnum - 1];
2949 :
2950 2394 : nnconstraints = lappend(nnconstraints, nn);
2951 : }
2952 :
2953 10598 : free_attrmap(newattmap);
2954 :
2955 : /*
2956 : * Close the parent rel, but keep our lock on it until xact commit.
2957 : * That will prevent someone else from deleting or ALTERing the parent
2958 : * before the child is committed.
2959 : */
2960 10598 : table_close(relation, NoLock);
2961 : }
2962 :
2963 : /*
2964 : * If we had no inherited attributes, the result columns are just the
2965 : * explicitly declared columns. Otherwise, we need to merge the declared
2966 : * columns into the inherited column list. Although, we never have any
2967 : * explicitly declared columns if the table is a partition.
2968 : */
2969 62900 : if (inh_columns != NIL)
2970 : {
2971 10162 : int newcol_attno = 0;
2972 :
2973 11136 : foreach(lc, columns)
2974 : {
2975 1052 : ColumnDef *newdef = lfirst_node(ColumnDef, lc);
2976 1052 : char *attributeName = newdef->colname;
2977 : int exist_attno;
2978 :
2979 : /*
2980 : * Partitions have only one parent and have no column definitions
2981 : * of their own, so conflict should never occur.
2982 : */
2983 : Assert(!is_partition);
2984 :
2985 1052 : newcol_attno++;
2986 :
2987 : /*
2988 : * Does it match some inherited column?
2989 : */
2990 1052 : exist_attno = findAttrByName(attributeName, inh_columns);
2991 1052 : if (exist_attno > 0)
2992 : {
2993 : /*
2994 : * Yes, try to merge the two column definitions.
2995 : */
2996 380 : MergeChildAttribute(inh_columns, exist_attno, newcol_attno, newdef);
2997 : }
2998 : else
2999 : {
3000 : /*
3001 : * No, attach new column unchanged to result columns.
3002 : */
3003 672 : inh_columns = lappend(inh_columns, newdef);
3004 : }
3005 : }
3006 :
3007 10084 : columns = inh_columns;
3008 :
3009 : /*
3010 : * Check that we haven't exceeded the legal # of columns after merging
3011 : * in inherited columns.
3012 : */
3013 10084 : if (list_length(columns) > MaxHeapAttributeNumber)
3014 0 : ereport(ERROR,
3015 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
3016 : errmsg("tables can have at most %d columns",
3017 : MaxHeapAttributeNumber)));
3018 : }
3019 :
3020 : /*
3021 : * Now that we have the column definition list for a partition, we can
3022 : * check whether the columns referenced in the column constraint specs
3023 : * actually exist. Also, merge column defaults.
3024 : */
3025 62822 : if (is_partition)
3026 : {
3027 8356 : foreach(lc, saved_columns)
3028 : {
3029 254 : ColumnDef *restdef = lfirst(lc);
3030 254 : bool found = false;
3031 : ListCell *l;
3032 :
3033 960 : foreach(l, columns)
3034 : {
3035 742 : ColumnDef *coldef = lfirst(l);
3036 :
3037 742 : if (strcmp(coldef->colname, restdef->colname) == 0)
3038 : {
3039 254 : found = true;
3040 :
3041 : /*
3042 : * Check for conflicts related to generated columns.
3043 : *
3044 : * Same rules as above: generated-ness has to match the
3045 : * parent, but the contents of the generation expression
3046 : * can be different.
3047 : */
3048 254 : if (coldef->generated)
3049 : {
3050 146 : if (restdef->raw_default && !restdef->generated)
3051 12 : ereport(ERROR,
3052 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3053 : errmsg("column \"%s\" inherits from generated column but specifies default",
3054 : restdef->colname)));
3055 134 : if (restdef->identity)
3056 0 : ereport(ERROR,
3057 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3058 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3059 : restdef->colname)));
3060 : }
3061 : else
3062 : {
3063 108 : if (restdef->generated)
3064 12 : ereport(ERROR,
3065 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3066 : errmsg("child column \"%s\" specifies generation expression",
3067 : restdef->colname),
3068 : errhint("A child table column cannot be generated unless its parent column is.")));
3069 : }
3070 :
3071 230 : if (coldef->generated && restdef->generated && coldef->generated != restdef->generated)
3072 12 : ereport(ERROR,
3073 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3074 : errmsg("column \"%s\" inherits from generated column of different kind",
3075 : restdef->colname),
3076 : errdetail("Parent column is %s, child column is %s.",
3077 : coldef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3078 : restdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3079 :
3080 : /*
3081 : * Override the parent's default value for this column
3082 : * (coldef->cooked_default) with the partition's local
3083 : * definition (restdef->raw_default), if there's one. It
3084 : * should be physically impossible to get a cooked default
3085 : * in the local definition or a raw default in the
3086 : * inherited definition, but make sure they're nulls, for
3087 : * future-proofing.
3088 : */
3089 : Assert(restdef->cooked_default == NULL);
3090 : Assert(coldef->raw_default == NULL);
3091 218 : if (restdef->raw_default)
3092 : {
3093 146 : coldef->raw_default = restdef->raw_default;
3094 146 : coldef->cooked_default = NULL;
3095 : }
3096 : }
3097 : }
3098 :
3099 : /* complain for constraints on columns not in parent */
3100 218 : if (!found)
3101 0 : ereport(ERROR,
3102 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3103 : errmsg("column \"%s\" does not exist",
3104 : restdef->colname)));
3105 : }
3106 : }
3107 :
3108 : /*
3109 : * If we found any conflicting parent default values, check to make sure
3110 : * they were overridden by the child.
3111 : */
3112 62786 : if (have_bogus_defaults)
3113 : {
3114 90 : foreach(lc, columns)
3115 : {
3116 72 : ColumnDef *def = lfirst(lc);
3117 :
3118 72 : if (def->cooked_default == &bogus_marker)
3119 : {
3120 18 : if (def->generated)
3121 12 : ereport(ERROR,
3122 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3123 : errmsg("column \"%s\" inherits conflicting generation expressions",
3124 : def->colname),
3125 : errhint("To resolve the conflict, specify a generation expression explicitly.")));
3126 : else
3127 6 : ereport(ERROR,
3128 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3129 : errmsg("column \"%s\" inherits conflicting default values",
3130 : def->colname),
3131 : errhint("To resolve the conflict, specify a default explicitly.")));
3132 : }
3133 : }
3134 : }
3135 :
3136 62768 : *supconstr = constraints;
3137 62768 : *supnotnulls = nnconstraints;
3138 :
3139 62768 : return columns;
3140 : }
3141 :
3142 :
3143 : /*
3144 : * MergeCheckConstraint
3145 : * Try to merge an inherited CHECK constraint with previous ones
3146 : *
3147 : * If we inherit identically-named constraints from multiple parents, we must
3148 : * merge them, or throw an error if they don't have identical definitions.
3149 : *
3150 : * constraints is a list of CookedConstraint structs for previous constraints.
3151 : *
3152 : * If the new constraint matches an existing one, then the existing
3153 : * constraint's inheritance count is updated. If there is a conflict (same
3154 : * name but different expression), throw an error. If the constraint neither
3155 : * matches nor conflicts with an existing one, a new constraint is appended to
3156 : * the list.
3157 : */
3158 : static List *
3159 688 : MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced)
3160 : {
3161 : ListCell *lc;
3162 : CookedConstraint *newcon;
3163 :
3164 2212 : foreach(lc, constraints)
3165 : {
3166 1674 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lc);
3167 :
3168 : Assert(ccon->contype == CONSTR_CHECK);
3169 :
3170 : /* Non-matching names never conflict */
3171 1674 : if (strcmp(ccon->name, name) != 0)
3172 1524 : continue;
3173 :
3174 150 : if (equal(expr, ccon->expr))
3175 : {
3176 : /* OK to merge constraint with existing */
3177 150 : if (pg_add_s16_overflow(ccon->inhcount, 1,
3178 : &ccon->inhcount))
3179 0 : ereport(ERROR,
3180 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3181 : errmsg("too many inheritance parents"));
3182 :
3183 : /*
3184 : * When enforceability differs, the merged constraint should be
3185 : * marked as ENFORCED because one of the parents is ENFORCED.
3186 : */
3187 150 : if (!ccon->is_enforced && is_enforced)
3188 : {
3189 48 : ccon->is_enforced = true;
3190 48 : ccon->skip_validation = false;
3191 : }
3192 :
3193 150 : return constraints;
3194 : }
3195 :
3196 0 : ereport(ERROR,
3197 : (errcode(ERRCODE_DUPLICATE_OBJECT),
3198 : errmsg("check constraint name \"%s\" appears multiple times but with different expressions",
3199 : name)));
3200 : }
3201 :
3202 : /*
3203 : * Constraint couldn't be merged with an existing one and also didn't
3204 : * conflict with an existing one, so add it as a new one to the list.
3205 : */
3206 538 : newcon = palloc0_object(CookedConstraint);
3207 538 : newcon->contype = CONSTR_CHECK;
3208 538 : newcon->name = pstrdup(name);
3209 538 : newcon->expr = expr;
3210 538 : newcon->inhcount = 1;
3211 538 : newcon->is_enforced = is_enforced;
3212 538 : newcon->skip_validation = !is_enforced;
3213 538 : return lappend(constraints, newcon);
3214 : }
3215 :
3216 : /*
3217 : * MergeChildAttribute
3218 : * Merge given child attribute definition into given inherited attribute.
3219 : *
3220 : * Input arguments:
3221 : * 'inh_columns' is the list of inherited ColumnDefs.
3222 : * 'exist_attno' is the number of the inherited attribute in inh_columns
3223 : * 'newcol_attno' is the attribute number in child table's schema definition
3224 : * 'newdef' is the column/attribute definition from the child table.
3225 : *
3226 : * The ColumnDef in 'inh_columns' list is modified. The child attribute's
3227 : * ColumnDef remains unchanged.
3228 : *
3229 : * Notes:
3230 : * - The attribute is merged according to the rules laid out in the prologue
3231 : * of MergeAttributes().
3232 : * - If matching inherited attribute exists but the child attribute can not be
3233 : * merged into it, the function throws respective errors.
3234 : * - A partition can not have its own column definitions. Hence this function
3235 : * is applicable only to a regular inheritance child.
3236 : */
3237 : static void
3238 380 : MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef)
3239 : {
3240 380 : char *attributeName = newdef->colname;
3241 : ColumnDef *inhdef;
3242 : Oid inhtypeid,
3243 : newtypeid;
3244 : int32 inhtypmod,
3245 : newtypmod;
3246 : Oid inhcollid,
3247 : newcollid;
3248 :
3249 380 : if (exist_attno == newcol_attno)
3250 346 : ereport(NOTICE,
3251 : (errmsg("merging column \"%s\" with inherited definition",
3252 : attributeName)));
3253 : else
3254 34 : ereport(NOTICE,
3255 : (errmsg("moving and merging column \"%s\" with inherited definition", attributeName),
3256 : errdetail("User-specified column moved to the position of the inherited column.")));
3257 :
3258 380 : inhdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3259 :
3260 : /*
3261 : * Must have the same type and typmod
3262 : */
3263 380 : typenameTypeIdAndMod(NULL, inhdef->typeName, &inhtypeid, &inhtypmod);
3264 380 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3265 380 : if (inhtypeid != newtypeid || inhtypmod != newtypmod)
3266 12 : ereport(ERROR,
3267 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3268 : errmsg("column \"%s\" has a type conflict",
3269 : attributeName),
3270 : errdetail("%s versus %s",
3271 : format_type_with_typemod(inhtypeid, inhtypmod),
3272 : format_type_with_typemod(newtypeid, newtypmod))));
3273 :
3274 : /*
3275 : * Must have the same collation
3276 : */
3277 368 : inhcollid = GetColumnDefCollation(NULL, inhdef, inhtypeid);
3278 368 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3279 368 : if (inhcollid != newcollid)
3280 6 : ereport(ERROR,
3281 : (errcode(ERRCODE_COLLATION_MISMATCH),
3282 : errmsg("column \"%s\" has a collation conflict",
3283 : attributeName),
3284 : errdetail("\"%s\" versus \"%s\"",
3285 : get_collation_name(inhcollid),
3286 : get_collation_name(newcollid))));
3287 :
3288 : /*
3289 : * Identity is never inherited by a regular inheritance child. Pick
3290 : * child's identity definition if there's one.
3291 : */
3292 362 : inhdef->identity = newdef->identity;
3293 :
3294 : /*
3295 : * Copy storage parameter
3296 : */
3297 362 : if (inhdef->storage == 0)
3298 0 : inhdef->storage = newdef->storage;
3299 362 : else if (newdef->storage != 0 && inhdef->storage != newdef->storage)
3300 6 : ereport(ERROR,
3301 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3302 : errmsg("column \"%s\" has a storage parameter conflict",
3303 : attributeName),
3304 : errdetail("%s versus %s",
3305 : storage_name(inhdef->storage),
3306 : storage_name(newdef->storage))));
3307 :
3308 : /*
3309 : * Copy compression parameter
3310 : */
3311 356 : if (inhdef->compression == NULL)
3312 350 : inhdef->compression = newdef->compression;
3313 6 : else if (newdef->compression != NULL)
3314 : {
3315 6 : if (strcmp(inhdef->compression, newdef->compression) != 0)
3316 6 : ereport(ERROR,
3317 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3318 : errmsg("column \"%s\" has a compression method conflict",
3319 : attributeName),
3320 : errdetail("%s versus %s", inhdef->compression, newdef->compression)));
3321 : }
3322 :
3323 : /*
3324 : * Merge of not-null constraints = OR 'em together
3325 : */
3326 350 : inhdef->is_not_null |= newdef->is_not_null;
3327 :
3328 : /*
3329 : * Check for conflicts related to generated columns.
3330 : *
3331 : * If the parent column is generated, the child column will be made a
3332 : * generated column if it isn't already. If it is a generated column,
3333 : * we'll take its generation expression in preference to the parent's. We
3334 : * must check that the child column doesn't specify a default value or
3335 : * identity, which matches the rules for a single column in
3336 : * parse_utilcmd.c.
3337 : *
3338 : * Conversely, if the parent column is not generated, the child column
3339 : * can't be either. (We used to allow that, but it results in being able
3340 : * to override the generation expression via UPDATEs through the parent.)
3341 : */
3342 350 : if (inhdef->generated)
3343 : {
3344 62 : if (newdef->raw_default && !newdef->generated)
3345 12 : ereport(ERROR,
3346 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3347 : errmsg("column \"%s\" inherits from generated column but specifies default",
3348 : inhdef->colname)));
3349 50 : if (newdef->identity)
3350 12 : ereport(ERROR,
3351 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3352 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3353 : inhdef->colname)));
3354 : }
3355 : else
3356 : {
3357 288 : if (newdef->generated)
3358 12 : ereport(ERROR,
3359 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3360 : errmsg("child column \"%s\" specifies generation expression",
3361 : inhdef->colname),
3362 : errhint("A child table column cannot be generated unless its parent column is.")));
3363 : }
3364 :
3365 314 : if (inhdef->generated && newdef->generated && newdef->generated != inhdef->generated)
3366 12 : ereport(ERROR,
3367 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3368 : errmsg("column \"%s\" inherits from generated column of different kind",
3369 : inhdef->colname),
3370 : errdetail("Parent column is %s, child column is %s.",
3371 : inhdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3372 : newdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3373 :
3374 : /*
3375 : * If new def has a default, override previous default
3376 : */
3377 302 : if (newdef->raw_default != NULL)
3378 : {
3379 30 : inhdef->raw_default = newdef->raw_default;
3380 30 : inhdef->cooked_default = newdef->cooked_default;
3381 : }
3382 :
3383 : /* Mark the column as locally defined */
3384 302 : inhdef->is_local = true;
3385 302 : }
3386 :
3387 : /*
3388 : * MergeInheritedAttribute
3389 : * Merge given parent attribute definition into specified attribute
3390 : * inherited from the previous parents.
3391 : *
3392 : * Input arguments:
3393 : * 'inh_columns' is the list of previously inherited ColumnDefs.
3394 : * 'exist_attno' is the number the existing matching attribute in inh_columns.
3395 : * 'newdef' is the new parent column/attribute definition to be merged.
3396 : *
3397 : * The matching ColumnDef in 'inh_columns' list is modified and returned.
3398 : *
3399 : * Notes:
3400 : * - The attribute is merged according to the rules laid out in the prologue
3401 : * of MergeAttributes().
3402 : * - If matching inherited attribute exists but the new attribute can not be
3403 : * merged into it, the function throws respective errors.
3404 : * - A partition inherits from only a single parent. Hence this function is
3405 : * applicable only to a regular inheritance.
3406 : */
3407 : static ColumnDef *
3408 370 : MergeInheritedAttribute(List *inh_columns,
3409 : int exist_attno,
3410 : const ColumnDef *newdef)
3411 : {
3412 370 : char *attributeName = newdef->colname;
3413 : ColumnDef *prevdef;
3414 : Oid prevtypeid,
3415 : newtypeid;
3416 : int32 prevtypmod,
3417 : newtypmod;
3418 : Oid prevcollid,
3419 : newcollid;
3420 :
3421 370 : ereport(NOTICE,
3422 : (errmsg("merging multiple inherited definitions of column \"%s\"",
3423 : attributeName)));
3424 370 : prevdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3425 :
3426 : /*
3427 : * Must have the same type and typmod
3428 : */
3429 370 : typenameTypeIdAndMod(NULL, prevdef->typeName, &prevtypeid, &prevtypmod);
3430 370 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3431 370 : if (prevtypeid != newtypeid || prevtypmod != newtypmod)
3432 0 : ereport(ERROR,
3433 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3434 : errmsg("inherited column \"%s\" has a type conflict",
3435 : attributeName),
3436 : errdetail("%s versus %s",
3437 : format_type_with_typemod(prevtypeid, prevtypmod),
3438 : format_type_with_typemod(newtypeid, newtypmod))));
3439 :
3440 : /*
3441 : * Must have the same collation
3442 : */
3443 370 : prevcollid = GetColumnDefCollation(NULL, prevdef, prevtypeid);
3444 370 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3445 370 : if (prevcollid != newcollid)
3446 0 : ereport(ERROR,
3447 : (errcode(ERRCODE_COLLATION_MISMATCH),
3448 : errmsg("inherited column \"%s\" has a collation conflict",
3449 : attributeName),
3450 : errdetail("\"%s\" versus \"%s\"",
3451 : get_collation_name(prevcollid),
3452 : get_collation_name(newcollid))));
3453 :
3454 : /*
3455 : * Copy/check storage parameter
3456 : */
3457 370 : if (prevdef->storage == 0)
3458 0 : prevdef->storage = newdef->storage;
3459 370 : else if (prevdef->storage != newdef->storage)
3460 6 : ereport(ERROR,
3461 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3462 : errmsg("inherited column \"%s\" has a storage parameter conflict",
3463 : attributeName),
3464 : errdetail("%s versus %s",
3465 : storage_name(prevdef->storage),
3466 : storage_name(newdef->storage))));
3467 :
3468 : /*
3469 : * Copy/check compression parameter
3470 : */
3471 364 : if (prevdef->compression == NULL)
3472 346 : prevdef->compression = newdef->compression;
3473 18 : else if (newdef->compression != NULL)
3474 : {
3475 6 : if (strcmp(prevdef->compression, newdef->compression) != 0)
3476 6 : ereport(ERROR,
3477 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3478 : errmsg("column \"%s\" has a compression method conflict",
3479 : attributeName),
3480 : errdetail("%s versus %s",
3481 : prevdef->compression, newdef->compression)));
3482 : }
3483 :
3484 : /*
3485 : * Check for GENERATED conflicts
3486 : */
3487 358 : if (prevdef->generated != newdef->generated)
3488 24 : ereport(ERROR,
3489 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3490 : errmsg("inherited column \"%s\" has a generation conflict",
3491 : attributeName)));
3492 :
3493 : /*
3494 : * Default and other constraints are handled by the caller.
3495 : */
3496 :
3497 334 : if (pg_add_s16_overflow(prevdef->inhcount, 1,
3498 : &prevdef->inhcount))
3499 0 : ereport(ERROR,
3500 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3501 : errmsg("too many inheritance parents"));
3502 :
3503 334 : return prevdef;
3504 : }
3505 :
3506 : /*
3507 : * StoreCatalogInheritance
3508 : * Updates the system catalogs with proper inheritance information.
3509 : *
3510 : * supers is a list of the OIDs of the new relation's direct ancestors.
3511 : */
3512 : static void
3513 62108 : StoreCatalogInheritance(Oid relationId, List *supers,
3514 : bool child_is_partition)
3515 : {
3516 : Relation relation;
3517 : int32 seqNumber;
3518 : ListCell *entry;
3519 :
3520 : /*
3521 : * sanity checks
3522 : */
3523 : Assert(OidIsValid(relationId));
3524 :
3525 62108 : if (supers == NIL)
3526 52384 : return;
3527 :
3528 : /*
3529 : * Store INHERITS information in pg_inherits using direct ancestors only.
3530 : * Also enter dependencies on the direct ancestors, and make sure they are
3531 : * marked with relhassubclass = true.
3532 : *
3533 : * (Once upon a time, both direct and indirect ancestors were found here
3534 : * and then entered into pg_ipl. Since that catalog doesn't exist
3535 : * anymore, there's no need to look for indirect ancestors.)
3536 : */
3537 9724 : relation = table_open(InheritsRelationId, RowExclusiveLock);
3538 :
3539 9724 : seqNumber = 1;
3540 19782 : foreach(entry, supers)
3541 : {
3542 10058 : Oid parentOid = lfirst_oid(entry);
3543 :
3544 10058 : StoreCatalogInheritance1(relationId, parentOid, seqNumber, relation,
3545 : child_is_partition);
3546 10058 : seqNumber++;
3547 : }
3548 :
3549 9724 : table_close(relation, RowExclusiveLock);
3550 : }
3551 :
3552 : /*
3553 : * Make catalog entries showing relationId as being an inheritance child
3554 : * of parentOid. inhRelation is the already-opened pg_inherits catalog.
3555 : */
3556 : static void
3557 12526 : StoreCatalogInheritance1(Oid relationId, Oid parentOid,
3558 : int32 seqNumber, Relation inhRelation,
3559 : bool child_is_partition)
3560 : {
3561 : ObjectAddress childobject,
3562 : parentobject;
3563 :
3564 : /* store the pg_inherits row */
3565 12526 : StoreSingleInheritance(relationId, parentOid, seqNumber);
3566 :
3567 : /*
3568 : * Store a dependency too
3569 : */
3570 12526 : parentobject.classId = RelationRelationId;
3571 12526 : parentobject.objectId = parentOid;
3572 12526 : parentobject.objectSubId = 0;
3573 12526 : childobject.classId = RelationRelationId;
3574 12526 : childobject.objectId = relationId;
3575 12526 : childobject.objectSubId = 0;
3576 :
3577 12526 : recordDependencyOn(&childobject, &parentobject,
3578 : child_dependency_type(child_is_partition));
3579 :
3580 : /*
3581 : * Post creation hook of this inheritance. Since object_access_hook
3582 : * doesn't take multiple object identifiers, we relay oid of parent
3583 : * relation using auxiliary_id argument.
3584 : */
3585 12526 : InvokeObjectPostAlterHookArg(InheritsRelationId,
3586 : relationId, 0,
3587 : parentOid, false);
3588 :
3589 : /*
3590 : * Mark the parent as having subclasses.
3591 : */
3592 12526 : SetRelationHasSubclass(parentOid, true);
3593 12526 : }
3594 :
3595 : /*
3596 : * Look for an existing column entry with the given name.
3597 : *
3598 : * Returns the index (starting with 1) if attribute already exists in columns,
3599 : * 0 if it doesn't.
3600 : */
3601 : static int
3602 22304 : findAttrByName(const char *attributeName, const List *columns)
3603 : {
3604 : ListCell *lc;
3605 22304 : int i = 1;
3606 :
3607 39880 : foreach(lc, columns)
3608 : {
3609 18326 : if (strcmp(attributeName, lfirst_node(ColumnDef, lc)->colname) == 0)
3610 750 : return i;
3611 :
3612 17576 : i++;
3613 : }
3614 21554 : return 0;
3615 : }
3616 :
3617 :
3618 : /*
3619 : * SetRelationHasSubclass
3620 : * Set the value of the relation's relhassubclass field in pg_class.
3621 : *
3622 : * It's always safe to set this field to true, because all SQL commands are
3623 : * ready to see true and then find no children. On the other hand, commands
3624 : * generally assume zero children if this is false.
3625 : *
3626 : * Caller must hold any self-exclusive lock until end of transaction. If the
3627 : * new value is false, caller must have acquired that lock before reading the
3628 : * evidence that justified the false value. That way, it properly waits if
3629 : * another backend is simultaneously concluding no need to change the tuple
3630 : * (new and old values are true).
3631 : *
3632 : * NOTE: an important side-effect of this operation is that an SI invalidation
3633 : * message is sent out to all backends --- including me --- causing plans
3634 : * referencing the relation to be rebuilt with the new list of children.
3635 : * This must happen even if we find that no change is needed in the pg_class
3636 : * row.
3637 : */
3638 : void
3639 15576 : SetRelationHasSubclass(Oid relationId, bool relhassubclass)
3640 : {
3641 : Relation relationRelation;
3642 : HeapTuple tuple;
3643 : Form_pg_class classtuple;
3644 :
3645 : Assert(CheckRelationOidLockedByMe(relationId,
3646 : ShareUpdateExclusiveLock, false) ||
3647 : CheckRelationOidLockedByMe(relationId,
3648 : ShareRowExclusiveLock, true));
3649 :
3650 : /*
3651 : * Fetch a modifiable copy of the tuple, modify it, update pg_class.
3652 : */
3653 15576 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
3654 15576 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
3655 15576 : if (!HeapTupleIsValid(tuple))
3656 0 : elog(ERROR, "cache lookup failed for relation %u", relationId);
3657 15576 : classtuple = (Form_pg_class) GETSTRUCT(tuple);
3658 :
3659 15576 : if (classtuple->relhassubclass != relhassubclass)
3660 : {
3661 7892 : classtuple->relhassubclass = relhassubclass;
3662 7892 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
3663 : }
3664 : else
3665 : {
3666 : /* no need to change tuple, but force relcache rebuild anyway */
3667 7684 : CacheInvalidateRelcacheByTuple(tuple);
3668 : }
3669 :
3670 15576 : heap_freetuple(tuple);
3671 15576 : table_close(relationRelation, RowExclusiveLock);
3672 15576 : }
3673 :
3674 : /*
3675 : * CheckRelationTableSpaceMove
3676 : * Check if relation can be moved to new tablespace.
3677 : *
3678 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3679 : *
3680 : * Returns true if the relation can be moved to the new tablespace; raises
3681 : * an error if it is not possible to do the move; returns false if the move
3682 : * would have no effect.
3683 : */
3684 : bool
3685 226 : CheckRelationTableSpaceMove(Relation rel, Oid newTableSpaceId)
3686 : {
3687 : Oid oldTableSpaceId;
3688 :
3689 : /*
3690 : * No work if no change in tablespace. Note that MyDatabaseTableSpace is
3691 : * stored as 0.
3692 : */
3693 226 : oldTableSpaceId = rel->rd_rel->reltablespace;
3694 226 : if (newTableSpaceId == oldTableSpaceId ||
3695 218 : (newTableSpaceId == MyDatabaseTableSpace && oldTableSpaceId == 0))
3696 10 : return false;
3697 :
3698 : /*
3699 : * We cannot support moving mapped relations into different tablespaces.
3700 : * (In particular this eliminates all shared catalogs.)
3701 : */
3702 216 : if (RelationIsMapped(rel))
3703 0 : ereport(ERROR,
3704 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3705 : errmsg("cannot move system relation \"%s\"",
3706 : RelationGetRelationName(rel))));
3707 :
3708 : /* Cannot move a non-shared relation into pg_global */
3709 216 : if (newTableSpaceId == GLOBALTABLESPACE_OID)
3710 12 : ereport(ERROR,
3711 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3712 : errmsg("only shared relations can be placed in pg_global tablespace")));
3713 :
3714 : /*
3715 : * Do not allow moving temp tables of other backends ... their local
3716 : * buffer manager is not going to cope.
3717 : */
3718 204 : if (RELATION_IS_OTHER_TEMP(rel))
3719 0 : ereport(ERROR,
3720 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3721 : errmsg("cannot move temporary tables of other sessions")));
3722 :
3723 204 : return true;
3724 : }
3725 :
3726 : /*
3727 : * SetRelationTableSpace
3728 : * Set new reltablespace and relfilenumber in pg_class entry.
3729 : *
3730 : * newTableSpaceId is the new tablespace for the relation, and
3731 : * newRelFilenumber its new filenumber. If newRelFilenumber is
3732 : * InvalidRelFileNumber, this field is not updated.
3733 : *
3734 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3735 : *
3736 : * The caller of this routine had better check if a relation can be
3737 : * moved to this new tablespace by calling CheckRelationTableSpaceMove()
3738 : * first, and is responsible for making the change visible with
3739 : * CommandCounterIncrement().
3740 : */
3741 : void
3742 204 : SetRelationTableSpace(Relation rel,
3743 : Oid newTableSpaceId,
3744 : RelFileNumber newRelFilenumber)
3745 : {
3746 : Relation pg_class;
3747 : HeapTuple tuple;
3748 : ItemPointerData otid;
3749 : Form_pg_class rd_rel;
3750 204 : Oid reloid = RelationGetRelid(rel);
3751 :
3752 : Assert(CheckRelationTableSpaceMove(rel, newTableSpaceId));
3753 :
3754 : /* Get a modifiable copy of the relation's pg_class row. */
3755 204 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
3756 :
3757 204 : tuple = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(reloid));
3758 204 : if (!HeapTupleIsValid(tuple))
3759 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
3760 204 : otid = tuple->t_self;
3761 204 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
3762 :
3763 : /* Update the pg_class row. */
3764 408 : rd_rel->reltablespace = (newTableSpaceId == MyDatabaseTableSpace) ?
3765 204 : InvalidOid : newTableSpaceId;
3766 204 : if (RelFileNumberIsValid(newRelFilenumber))
3767 160 : rd_rel->relfilenode = newRelFilenumber;
3768 204 : CatalogTupleUpdate(pg_class, &otid, tuple);
3769 204 : UnlockTuple(pg_class, &otid, InplaceUpdateTupleLock);
3770 :
3771 : /*
3772 : * Record dependency on tablespace. This is only required for relations
3773 : * that have no physical storage.
3774 : */
3775 204 : if (!RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
3776 30 : changeDependencyOnTablespace(RelationRelationId, reloid,
3777 : rd_rel->reltablespace);
3778 :
3779 204 : heap_freetuple(tuple);
3780 204 : table_close(pg_class, RowExclusiveLock);
3781 204 : }
3782 :
3783 : /*
3784 : * renameatt_check - basic sanity checks before attribute rename
3785 : */
3786 : static void
3787 1008 : renameatt_check(Oid myrelid, Form_pg_class classform, bool recursing)
3788 : {
3789 1008 : char relkind = classform->relkind;
3790 :
3791 1008 : if (classform->reloftype && !recursing)
3792 6 : ereport(ERROR,
3793 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3794 : errmsg("cannot rename column of typed table")));
3795 :
3796 : /*
3797 : * Renaming the columns of sequences or toast tables doesn't actually
3798 : * break anything from the system's point of view, since internal
3799 : * references are by attnum. But it doesn't seem right to allow users to
3800 : * change names that are hardcoded into the system, hence the following
3801 : * restriction.
3802 : */
3803 1002 : if (relkind != RELKIND_RELATION &&
3804 84 : relkind != RELKIND_VIEW &&
3805 84 : relkind != RELKIND_MATVIEW &&
3806 36 : relkind != RELKIND_COMPOSITE_TYPE &&
3807 36 : relkind != RELKIND_INDEX &&
3808 36 : relkind != RELKIND_PARTITIONED_INDEX &&
3809 0 : relkind != RELKIND_FOREIGN_TABLE &&
3810 : relkind != RELKIND_PARTITIONED_TABLE)
3811 0 : ereport(ERROR,
3812 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3813 : errmsg("cannot rename columns of relation \"%s\"",
3814 : NameStr(classform->relname)),
3815 : errdetail_relkind_not_supported(relkind)));
3816 :
3817 : /*
3818 : * permissions checking. only the owner of a class can change its schema.
3819 : */
3820 1002 : if (!object_ownercheck(RelationRelationId, myrelid, GetUserId()))
3821 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(myrelid)),
3822 0 : NameStr(classform->relname));
3823 1002 : if (!allowSystemTableMods && IsSystemClass(myrelid, classform))
3824 2 : ereport(ERROR,
3825 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3826 : errmsg("permission denied: \"%s\" is a system catalog",
3827 : NameStr(classform->relname))));
3828 1000 : }
3829 :
3830 : /*
3831 : * renameatt_internal - workhorse for renameatt
3832 : *
3833 : * Return value is the attribute number in the 'myrelid' relation.
3834 : */
3835 : static AttrNumber
3836 552 : renameatt_internal(Oid myrelid,
3837 : const char *oldattname,
3838 : const char *newattname,
3839 : bool recurse,
3840 : bool recursing,
3841 : int expected_parents,
3842 : DropBehavior behavior)
3843 : {
3844 : Relation targetrelation;
3845 : Relation attrelation;
3846 : HeapTuple atttup;
3847 : Form_pg_attribute attform;
3848 : AttrNumber attnum;
3849 :
3850 : /*
3851 : * Grab an exclusive lock on the target table, which we will NOT release
3852 : * until end of transaction.
3853 : */
3854 552 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
3855 552 : renameatt_check(myrelid, RelationGetForm(targetrelation), recursing);
3856 :
3857 : /*
3858 : * if the 'recurse' flag is set then we are supposed to rename this
3859 : * attribute in all classes that inherit from 'relname' (as well as in
3860 : * 'relname').
3861 : *
3862 : * any permissions or problems with duplicate attributes will cause the
3863 : * whole transaction to abort, which is what we want -- all or nothing.
3864 : */
3865 552 : if (recurse)
3866 : {
3867 : List *child_oids,
3868 : *child_numparents;
3869 : ListCell *lo,
3870 : *li;
3871 :
3872 : /*
3873 : * we need the number of parents for each child so that the recursive
3874 : * calls to renameatt() can determine whether there are any parents
3875 : * outside the inheritance hierarchy being processed.
3876 : */
3877 248 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
3878 : &child_numparents);
3879 :
3880 : /*
3881 : * find_all_inheritors does the recursive search of the inheritance
3882 : * hierarchy, so all we have to do is process all of the relids in the
3883 : * list that it returns.
3884 : */
3885 734 : forboth(lo, child_oids, li, child_numparents)
3886 : {
3887 516 : Oid childrelid = lfirst_oid(lo);
3888 516 : int numparents = lfirst_int(li);
3889 :
3890 516 : if (childrelid == myrelid)
3891 248 : continue;
3892 : /* note we need not recurse again */
3893 268 : renameatt_internal(childrelid, oldattname, newattname, false, true, numparents, behavior);
3894 : }
3895 : }
3896 : else
3897 : {
3898 : /*
3899 : * If we are told not to recurse, there had better not be any child
3900 : * tables; else the rename would put them out of step.
3901 : *
3902 : * expected_parents will only be 0 if we are not already recursing.
3903 : */
3904 340 : if (expected_parents == 0 &&
3905 36 : find_inheritance_children(myrelid, NoLock) != NIL)
3906 12 : ereport(ERROR,
3907 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3908 : errmsg("inherited column \"%s\" must be renamed in child tables too",
3909 : oldattname)));
3910 : }
3911 :
3912 : /* rename attributes in typed tables of composite type */
3913 510 : if (targetrelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
3914 : {
3915 : List *child_oids;
3916 : ListCell *lo;
3917 :
3918 24 : child_oids = find_typed_table_dependencies(targetrelation->rd_rel->reltype,
3919 24 : RelationGetRelationName(targetrelation),
3920 : behavior);
3921 :
3922 24 : foreach(lo, child_oids)
3923 6 : renameatt_internal(lfirst_oid(lo), oldattname, newattname, true, true, 0, behavior);
3924 : }
3925 :
3926 504 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
3927 :
3928 504 : atttup = SearchSysCacheCopyAttName(myrelid, oldattname);
3929 504 : if (!HeapTupleIsValid(atttup))
3930 24 : ereport(ERROR,
3931 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3932 : errmsg("column \"%s\" does not exist",
3933 : oldattname)));
3934 480 : attform = (Form_pg_attribute) GETSTRUCT(atttup);
3935 :
3936 480 : attnum = attform->attnum;
3937 480 : if (attnum <= 0)
3938 0 : ereport(ERROR,
3939 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3940 : errmsg("cannot rename system column \"%s\"",
3941 : oldattname)));
3942 :
3943 : /*
3944 : * if the attribute is inherited, forbid the renaming. if this is a
3945 : * top-level call to renameatt(), then expected_parents will be 0, so the
3946 : * effect of this code will be to prohibit the renaming if the attribute
3947 : * is inherited at all. if this is a recursive call to renameatt(),
3948 : * expected_parents will be the number of parents the current relation has
3949 : * within the inheritance hierarchy being processed, so we'll prohibit the
3950 : * renaming only if there are additional parents from elsewhere.
3951 : */
3952 480 : if (attform->attinhcount > expected_parents)
3953 30 : ereport(ERROR,
3954 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3955 : errmsg("cannot rename inherited column \"%s\"",
3956 : oldattname)));
3957 :
3958 : /* new name should not already exist */
3959 450 : (void) check_for_column_name_collision(targetrelation, newattname, false);
3960 :
3961 : /* apply the update */
3962 438 : namestrcpy(&(attform->attname), newattname);
3963 :
3964 438 : CatalogTupleUpdate(attrelation, &atttup->t_self, atttup);
3965 :
3966 438 : InvokeObjectPostAlterHook(RelationRelationId, myrelid, attnum);
3967 :
3968 438 : heap_freetuple(atttup);
3969 :
3970 438 : table_close(attrelation, RowExclusiveLock);
3971 :
3972 438 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
3973 :
3974 438 : return attnum;
3975 : }
3976 :
3977 : /*
3978 : * Perform permissions and integrity checks before acquiring a relation lock.
3979 : */
3980 : static void
3981 408 : RangeVarCallbackForRenameAttribute(const RangeVar *rv, Oid relid, Oid oldrelid,
3982 : void *arg)
3983 : {
3984 : HeapTuple tuple;
3985 : Form_pg_class form;
3986 :
3987 408 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
3988 408 : if (!HeapTupleIsValid(tuple))
3989 36 : return; /* concurrently dropped */
3990 372 : form = (Form_pg_class) GETSTRUCT(tuple);
3991 372 : renameatt_check(relid, form, false);
3992 364 : ReleaseSysCache(tuple);
3993 : }
3994 :
3995 : /*
3996 : * renameatt - changes the name of an attribute in a relation
3997 : *
3998 : * The returned ObjectAddress is that of the renamed column.
3999 : */
4000 : ObjectAddress
4001 316 : renameatt(RenameStmt *stmt)
4002 : {
4003 : Oid relid;
4004 : AttrNumber attnum;
4005 : ObjectAddress address;
4006 :
4007 : /* lock level taken here should match renameatt_internal */
4008 316 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4009 316 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4010 : RangeVarCallbackForRenameAttribute,
4011 : NULL);
4012 :
4013 302 : if (!OidIsValid(relid))
4014 : {
4015 24 : ereport(NOTICE,
4016 : (errmsg("relation \"%s\" does not exist, skipping",
4017 : stmt->relation->relname)));
4018 24 : return InvalidObjectAddress;
4019 : }
4020 :
4021 : attnum =
4022 278 : renameatt_internal(relid,
4023 278 : stmt->subname, /* old att name */
4024 278 : stmt->newname, /* new att name */
4025 278 : stmt->relation->inh, /* recursive? */
4026 : false, /* recursing? */
4027 : 0, /* expected inhcount */
4028 : stmt->behavior);
4029 :
4030 194 : ObjectAddressSubSet(address, RelationRelationId, relid, attnum);
4031 :
4032 194 : return address;
4033 : }
4034 :
4035 : /*
4036 : * same logic as renameatt_internal
4037 : */
4038 : static ObjectAddress
4039 90 : rename_constraint_internal(Oid myrelid,
4040 : Oid mytypid,
4041 : const char *oldconname,
4042 : const char *newconname,
4043 : bool recurse,
4044 : bool recursing,
4045 : int expected_parents)
4046 : {
4047 90 : Relation targetrelation = NULL;
4048 : Oid constraintOid;
4049 : HeapTuple tuple;
4050 : Form_pg_constraint con;
4051 : ObjectAddress address;
4052 :
4053 : Assert(!myrelid || !mytypid);
4054 :
4055 90 : if (mytypid)
4056 : {
4057 6 : constraintOid = get_domain_constraint_oid(mytypid, oldconname, false);
4058 : }
4059 : else
4060 : {
4061 84 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
4062 :
4063 : /*
4064 : * don't tell it whether we're recursing; we allow changing typed
4065 : * tables here
4066 : */
4067 84 : renameatt_check(myrelid, RelationGetForm(targetrelation), false);
4068 :
4069 84 : constraintOid = get_relation_constraint_oid(myrelid, oldconname, false);
4070 : }
4071 :
4072 90 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
4073 90 : if (!HeapTupleIsValid(tuple))
4074 0 : elog(ERROR, "cache lookup failed for constraint %u",
4075 : constraintOid);
4076 90 : con = (Form_pg_constraint) GETSTRUCT(tuple);
4077 :
4078 90 : if (myrelid &&
4079 84 : (con->contype == CONSTRAINT_CHECK ||
4080 24 : con->contype == CONSTRAINT_NOTNULL) &&
4081 66 : !con->connoinherit)
4082 : {
4083 54 : if (recurse)
4084 : {
4085 : List *child_oids,
4086 : *child_numparents;
4087 : ListCell *lo,
4088 : *li;
4089 :
4090 36 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
4091 : &child_numparents);
4092 :
4093 84 : forboth(lo, child_oids, li, child_numparents)
4094 : {
4095 48 : Oid childrelid = lfirst_oid(lo);
4096 48 : int numparents = lfirst_int(li);
4097 :
4098 48 : if (childrelid == myrelid)
4099 36 : continue;
4100 :
4101 12 : rename_constraint_internal(childrelid, InvalidOid, oldconname, newconname, false, true, numparents);
4102 : }
4103 : }
4104 : else
4105 : {
4106 24 : if (expected_parents == 0 &&
4107 6 : find_inheritance_children(myrelid, NoLock) != NIL)
4108 6 : ereport(ERROR,
4109 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4110 : errmsg("inherited constraint \"%s\" must be renamed in child tables too",
4111 : oldconname)));
4112 : }
4113 :
4114 48 : if (con->coninhcount > expected_parents)
4115 6 : ereport(ERROR,
4116 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4117 : errmsg("cannot rename inherited constraint \"%s\"",
4118 : oldconname)));
4119 : }
4120 :
4121 78 : if (con->conindid
4122 18 : && (con->contype == CONSTRAINT_PRIMARY
4123 6 : || con->contype == CONSTRAINT_UNIQUE
4124 0 : || con->contype == CONSTRAINT_EXCLUSION))
4125 : /* rename the index; this renames the constraint as well */
4126 18 : RenameRelationInternal(con->conindid, newconname, false, true);
4127 : else
4128 60 : RenameConstraintById(constraintOid, newconname);
4129 :
4130 78 : ObjectAddressSet(address, ConstraintRelationId, constraintOid);
4131 :
4132 78 : ReleaseSysCache(tuple);
4133 :
4134 78 : if (targetrelation)
4135 : {
4136 : /*
4137 : * Invalidate relcache so as others can see the new constraint name.
4138 : */
4139 72 : CacheInvalidateRelcache(targetrelation);
4140 :
4141 72 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4142 : }
4143 :
4144 78 : return address;
4145 : }
4146 :
4147 : ObjectAddress
4148 84 : RenameConstraint(RenameStmt *stmt)
4149 : {
4150 84 : Oid relid = InvalidOid;
4151 84 : Oid typid = InvalidOid;
4152 :
4153 84 : if (stmt->renameType == OBJECT_DOMCONSTRAINT)
4154 : {
4155 : Relation rel;
4156 : HeapTuple tup;
4157 :
4158 6 : typid = typenameTypeId(NULL, makeTypeNameFromNameList(castNode(List, stmt->object)));
4159 6 : rel = table_open(TypeRelationId, RowExclusiveLock);
4160 6 : tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
4161 6 : if (!HeapTupleIsValid(tup))
4162 0 : elog(ERROR, "cache lookup failed for type %u", typid);
4163 6 : checkDomainOwner(tup);
4164 6 : ReleaseSysCache(tup);
4165 6 : table_close(rel, NoLock);
4166 : }
4167 : else
4168 : {
4169 : /* lock level taken here should match rename_constraint_internal */
4170 78 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4171 78 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4172 : RangeVarCallbackForRenameAttribute,
4173 : NULL);
4174 78 : if (!OidIsValid(relid))
4175 : {
4176 6 : ereport(NOTICE,
4177 : (errmsg("relation \"%s\" does not exist, skipping",
4178 : stmt->relation->relname)));
4179 6 : return InvalidObjectAddress;
4180 : }
4181 : }
4182 :
4183 : return
4184 78 : rename_constraint_internal(relid, typid,
4185 78 : stmt->subname,
4186 78 : stmt->newname,
4187 150 : (stmt->relation &&
4188 72 : stmt->relation->inh), /* recursive? */
4189 : false, /* recursing? */
4190 : 0 /* expected inhcount */ );
4191 : }
4192 :
4193 : /*
4194 : * Execute ALTER TABLE/INDEX/SEQUENCE/VIEW/MATERIALIZED VIEW/FOREIGN TABLE
4195 : * RENAME
4196 : */
4197 : ObjectAddress
4198 512 : RenameRelation(RenameStmt *stmt)
4199 : {
4200 512 : bool is_index_stmt = stmt->renameType == OBJECT_INDEX;
4201 : Oid relid;
4202 : ObjectAddress address;
4203 :
4204 : /*
4205 : * Grab an exclusive lock on the target table, index, sequence, view,
4206 : * materialized view, or foreign table, which we will NOT release until
4207 : * end of transaction.
4208 : *
4209 : * Lock level used here should match RenameRelationInternal, to avoid lock
4210 : * escalation. However, because ALTER INDEX can be used with any relation
4211 : * type, we mustn't believe without verification.
4212 : */
4213 : for (;;)
4214 12 : {
4215 : LOCKMODE lockmode;
4216 : char relkind;
4217 : bool obj_is_index;
4218 :
4219 524 : lockmode = is_index_stmt ? ShareUpdateExclusiveLock : AccessExclusiveLock;
4220 :
4221 524 : relid = RangeVarGetRelidExtended(stmt->relation, lockmode,
4222 524 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4223 : RangeVarCallbackForAlterRelation,
4224 : stmt);
4225 :
4226 474 : if (!OidIsValid(relid))
4227 : {
4228 18 : ereport(NOTICE,
4229 : (errmsg("relation \"%s\" does not exist, skipping",
4230 : stmt->relation->relname)));
4231 18 : return InvalidObjectAddress;
4232 : }
4233 :
4234 : /*
4235 : * We allow mismatched statement and object types (e.g., ALTER INDEX
4236 : * to rename a table), but we might've used the wrong lock level. If
4237 : * that happens, retry with the correct lock level. We don't bother
4238 : * if we already acquired AccessExclusiveLock with an index, however.
4239 : */
4240 456 : relkind = get_rel_relkind(relid);
4241 456 : obj_is_index = (relkind == RELKIND_INDEX ||
4242 : relkind == RELKIND_PARTITIONED_INDEX);
4243 456 : if (obj_is_index || is_index_stmt == obj_is_index)
4244 : break;
4245 :
4246 12 : UnlockRelationOid(relid, lockmode);
4247 12 : is_index_stmt = obj_is_index;
4248 : }
4249 :
4250 : /* Do the work */
4251 444 : RenameRelationInternal(relid, stmt->newname, false, is_index_stmt);
4252 :
4253 432 : ObjectAddressSet(address, RelationRelationId, relid);
4254 :
4255 432 : return address;
4256 : }
4257 :
4258 : /*
4259 : * RenameRelationInternal - change the name of a relation
4260 : */
4261 : void
4262 1676 : RenameRelationInternal(Oid myrelid, const char *newrelname, bool is_internal, bool is_index)
4263 : {
4264 : Relation targetrelation;
4265 : Relation relrelation; /* for RELATION relation */
4266 : ItemPointerData otid;
4267 : HeapTuple reltup;
4268 : Form_pg_class relform;
4269 : Oid namespaceId;
4270 :
4271 : /*
4272 : * Grab a lock on the target relation, which we will NOT release until end
4273 : * of transaction. We need at least a self-exclusive lock so that
4274 : * concurrent DDL doesn't overwrite the rename if they start updating
4275 : * while still seeing the old version. The lock also guards against
4276 : * triggering relcache reloads in concurrent sessions, which might not
4277 : * handle this information changing under them. For indexes, we can use a
4278 : * reduced lock level because RelationReloadIndexInfo() handles indexes
4279 : * specially.
4280 : */
4281 1676 : targetrelation = relation_open(myrelid, is_index ? ShareUpdateExclusiveLock : AccessExclusiveLock);
4282 1676 : namespaceId = RelationGetNamespace(targetrelation);
4283 :
4284 : /*
4285 : * Find relation's pg_class tuple, and make sure newrelname isn't in use.
4286 : */
4287 1676 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4288 :
4289 1676 : reltup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(myrelid));
4290 1676 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4291 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4292 1676 : otid = reltup->t_self;
4293 1676 : relform = (Form_pg_class) GETSTRUCT(reltup);
4294 :
4295 1676 : if (get_relname_relid(newrelname, namespaceId) != InvalidOid)
4296 12 : ereport(ERROR,
4297 : (errcode(ERRCODE_DUPLICATE_TABLE),
4298 : errmsg("relation \"%s\" already exists",
4299 : newrelname)));
4300 :
4301 : /*
4302 : * RenameRelation is careful not to believe the caller's idea of the
4303 : * relation kind being handled. We don't have to worry about this, but
4304 : * let's not be totally oblivious to it. We can process an index as
4305 : * not-an-index, but not the other way around.
4306 : */
4307 : Assert(!is_index ||
4308 : is_index == (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4309 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX));
4310 :
4311 : /*
4312 : * Update pg_class tuple with new relname. (Scribbling on reltup is OK
4313 : * because it's a copy...)
4314 : */
4315 1664 : namestrcpy(&(relform->relname), newrelname);
4316 :
4317 1664 : CatalogTupleUpdate(relrelation, &otid, reltup);
4318 1664 : UnlockTuple(relrelation, &otid, InplaceUpdateTupleLock);
4319 :
4320 1664 : InvokeObjectPostAlterHookArg(RelationRelationId, myrelid, 0,
4321 : InvalidOid, is_internal);
4322 :
4323 1664 : heap_freetuple(reltup);
4324 1664 : table_close(relrelation, RowExclusiveLock);
4325 :
4326 : /*
4327 : * Also rename the associated type, if any.
4328 : */
4329 1664 : if (OidIsValid(targetrelation->rd_rel->reltype))
4330 126 : RenameTypeInternal(targetrelation->rd_rel->reltype,
4331 : newrelname, namespaceId);
4332 :
4333 : /*
4334 : * Also rename the associated constraint, if any.
4335 : */
4336 1664 : if (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4337 874 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
4338 : {
4339 808 : Oid constraintId = get_index_constraint(myrelid);
4340 :
4341 808 : if (OidIsValid(constraintId))
4342 36 : RenameConstraintById(constraintId, newrelname);
4343 : }
4344 :
4345 : /*
4346 : * Close rel, but keep lock!
4347 : */
4348 1664 : relation_close(targetrelation, NoLock);
4349 1664 : }
4350 :
4351 : /*
4352 : * ResetRelRewrite - reset relrewrite
4353 : */
4354 : void
4355 596 : ResetRelRewrite(Oid myrelid)
4356 : {
4357 : Relation relrelation; /* for RELATION relation */
4358 : HeapTuple reltup;
4359 : Form_pg_class relform;
4360 :
4361 : /*
4362 : * Find relation's pg_class tuple.
4363 : */
4364 596 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4365 :
4366 596 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
4367 596 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4368 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4369 596 : relform = (Form_pg_class) GETSTRUCT(reltup);
4370 :
4371 : /*
4372 : * Update pg_class tuple.
4373 : */
4374 596 : relform->relrewrite = InvalidOid;
4375 :
4376 596 : CatalogTupleUpdate(relrelation, &reltup->t_self, reltup);
4377 :
4378 596 : heap_freetuple(reltup);
4379 596 : table_close(relrelation, RowExclusiveLock);
4380 596 : }
4381 :
4382 : /*
4383 : * Disallow ALTER TABLE (and similar commands) when the current backend has
4384 : * any open reference to the target table besides the one just acquired by
4385 : * the calling command; this implies there's an open cursor or active plan.
4386 : * We need this check because our lock doesn't protect us against stomping
4387 : * on our own foot, only other people's feet!
4388 : *
4389 : * For ALTER TABLE, the only case known to cause serious trouble is ALTER
4390 : * COLUMN TYPE, and some changes are obviously pretty benign, so this could
4391 : * possibly be relaxed to only error out for certain types of alterations.
4392 : * But the use-case for allowing any of these things is not obvious, so we
4393 : * won't work hard at it for now.
4394 : *
4395 : * We also reject these commands if there are any pending AFTER trigger events
4396 : * for the rel. This is certainly necessary for the rewriting variants of
4397 : * ALTER TABLE, because they don't preserve tuple TIDs and so the pending
4398 : * events would try to fetch the wrong tuples. It might be overly cautious
4399 : * in other cases, but again it seems better to err on the side of paranoia.
4400 : *
4401 : * REINDEX calls this with "rel" referencing the index to be rebuilt; here
4402 : * we are worried about active indexscans on the index. The trigger-event
4403 : * check can be skipped, since we are doing no damage to the parent table.
4404 : *
4405 : * The statement name (eg, "ALTER TABLE") is passed for use in error messages.
4406 : */
4407 : void
4408 170340 : CheckTableNotInUse(Relation rel, const char *stmt)
4409 : {
4410 : int expected_refcnt;
4411 :
4412 170340 : expected_refcnt = rel->rd_isnailed ? 2 : 1;
4413 170340 : if (rel->rd_refcnt != expected_refcnt)
4414 42 : ereport(ERROR,
4415 : (errcode(ERRCODE_OBJECT_IN_USE),
4416 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4417 : errmsg("cannot %s \"%s\" because it is being used by active queries in this session",
4418 : stmt, RelationGetRelationName(rel))));
4419 :
4420 170298 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
4421 277474 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
4422 137696 : AfterTriggerPendingOnRel(RelationGetRelid(rel)))
4423 18 : ereport(ERROR,
4424 : (errcode(ERRCODE_OBJECT_IN_USE),
4425 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4426 : errmsg("cannot %s \"%s\" because it has pending trigger events",
4427 : stmt, RelationGetRelationName(rel))));
4428 170280 : }
4429 :
4430 : /*
4431 : * CheckAlterTableIsSafe
4432 : * Verify that it's safe to allow ALTER TABLE on this relation.
4433 : *
4434 : * This consists of CheckTableNotInUse() plus a check that the relation
4435 : * isn't another session's temp table. We must split out the temp-table
4436 : * check because there are callers of CheckTableNotInUse() that don't want
4437 : * that, notably DROP TABLE. (We must allow DROP or we couldn't clean out
4438 : * an orphaned temp schema.) Compare truncate_check_activity().
4439 : */
4440 : static void
4441 61316 : CheckAlterTableIsSafe(Relation rel)
4442 : {
4443 : /*
4444 : * Don't allow ALTER on temp tables of other backends. Their local buffer
4445 : * manager is not going to cope if we need to change the table's contents.
4446 : * Even if we don't, there may be optimizations that assume temp tables
4447 : * aren't subject to such interference.
4448 : */
4449 61316 : if (RELATION_IS_OTHER_TEMP(rel))
4450 0 : ereport(ERROR,
4451 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4452 : errmsg("cannot alter temporary tables of other sessions")));
4453 :
4454 : /*
4455 : * Also check for active uses of the relation in the current transaction,
4456 : * including open scans and pending AFTER trigger events.
4457 : */
4458 61316 : CheckTableNotInUse(rel, "ALTER TABLE");
4459 61280 : }
4460 :
4461 : /*
4462 : * AlterTableLookupRelation
4463 : * Look up, and lock, the OID for the relation named by an alter table
4464 : * statement.
4465 : */
4466 : Oid
4467 32310 : AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
4468 : {
4469 64532 : return RangeVarGetRelidExtended(stmt->relation, lockmode,
4470 32310 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4471 : RangeVarCallbackForAlterRelation,
4472 : stmt);
4473 : }
4474 :
4475 : /*
4476 : * AlterTable
4477 : * Execute ALTER TABLE, which can be a list of subcommands
4478 : *
4479 : * ALTER TABLE is performed in three phases:
4480 : * 1. Examine subcommands and perform pre-transformation checking.
4481 : * 2. Validate and transform subcommands, and update system catalogs.
4482 : * 3. Scan table(s) to check new constraints, and optionally recopy
4483 : * the data into new table(s).
4484 : * Phase 3 is not performed unless one or more of the subcommands requires
4485 : * it. The intention of this design is to allow multiple independent
4486 : * updates of the table schema to be performed with only one pass over the
4487 : * data.
4488 : *
4489 : * ATPrepCmd performs phase 1. A "work queue" entry is created for
4490 : * each table to be affected (there may be multiple affected tables if the
4491 : * commands traverse a table inheritance hierarchy). Also we do preliminary
4492 : * validation of the subcommands. Because earlier subcommands may change
4493 : * the catalog state seen by later commands, there are limits to what can
4494 : * be done in this phase. Generally, this phase acquires table locks,
4495 : * checks permissions and relkind, and recurses to find child tables.
4496 : *
4497 : * ATRewriteCatalogs performs phase 2 for each affected table.
4498 : * Certain subcommands need to be performed before others to avoid
4499 : * unnecessary conflicts; for example, DROP COLUMN should come before
4500 : * ADD COLUMN. Therefore phase 1 divides the subcommands into multiple
4501 : * lists, one for each logical "pass" of phase 2.
4502 : *
4503 : * ATRewriteTables performs phase 3 for those tables that need it.
4504 : *
4505 : * For most subcommand types, phases 2 and 3 do no explicit recursion,
4506 : * since phase 1 already does it. However, for certain subcommand types
4507 : * it is only possible to determine how to recurse at phase 2 time; for
4508 : * those cases, phase 1 sets the cmd->recurse flag.
4509 : *
4510 : * Thanks to the magic of MVCC, an error anywhere along the way rolls back
4511 : * the whole operation; we don't have to do anything special to clean up.
4512 : *
4513 : * The caller must lock the relation, with an appropriate lock level
4514 : * for the subcommands requested, using AlterTableGetLockLevel(stmt->cmds)
4515 : * or higher. We pass the lock level down
4516 : * so that we can apply it recursively to inherited tables. Note that the
4517 : * lock level we want as we recurse might well be higher than required for
4518 : * that specific subcommand. So we pass down the overall lock requirement,
4519 : * rather than reassess it at lower levels.
4520 : *
4521 : * The caller also provides a "context" which is to be passed back to
4522 : * utility.c when we need to execute a subcommand such as CREATE INDEX.
4523 : * Some of the fields therein, such as the relid, are used here as well.
4524 : */
4525 : void
4526 32084 : AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
4527 : AlterTableUtilityContext *context)
4528 : {
4529 : Relation rel;
4530 :
4531 : /* Caller is required to provide an adequate lock. */
4532 32084 : rel = relation_open(context->relid, NoLock);
4533 :
4534 32084 : CheckAlterTableIsSafe(rel);
4535 :
4536 32066 : ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
4537 28364 : }
4538 :
4539 : /*
4540 : * AlterTableInternal
4541 : *
4542 : * ALTER TABLE with target specified by OID
4543 : *
4544 : * We do not reject if the relation is already open, because it's quite
4545 : * likely that one or more layers of caller have it open. That means it
4546 : * is unsafe to use this entry point for alterations that could break
4547 : * existing query plans. On the assumption it's not used for such, we
4548 : * don't have to reject pending AFTER triggers, either.
4549 : *
4550 : * Also, since we don't have an AlterTableUtilityContext, this cannot be
4551 : * used for any subcommand types that require parse transformation or
4552 : * could generate subcommands that have to be passed to ProcessUtility.
4553 : */
4554 : void
4555 278 : AlterTableInternal(Oid relid, List *cmds, bool recurse)
4556 : {
4557 : Relation rel;
4558 278 : LOCKMODE lockmode = AlterTableGetLockLevel(cmds);
4559 :
4560 278 : rel = relation_open(relid, lockmode);
4561 :
4562 278 : EventTriggerAlterTableRelid(relid);
4563 :
4564 278 : ATController(NULL, rel, cmds, recurse, lockmode, NULL);
4565 278 : }
4566 :
4567 : /*
4568 : * AlterTableGetLockLevel
4569 : *
4570 : * Sets the overall lock level required for the supplied list of subcommands.
4571 : * Policy for doing this set according to needs of AlterTable(), see
4572 : * comments there for overall explanation.
4573 : *
4574 : * Function is called before and after parsing, so it must give same
4575 : * answer each time it is called. Some subcommands are transformed
4576 : * into other subcommand types, so the transform must never be made to a
4577 : * lower lock level than previously assigned. All transforms are noted below.
4578 : *
4579 : * Since this is called before we lock the table we cannot use table metadata
4580 : * to influence the type of lock we acquire.
4581 : *
4582 : * There should be no lockmodes hardcoded into the subcommand functions. All
4583 : * lockmode decisions for ALTER TABLE are made here only. The one exception is
4584 : * ALTER TABLE RENAME which is treated as a different statement type T_RenameStmt
4585 : * and does not travel through this section of code and cannot be combined with
4586 : * any of the subcommands given here.
4587 : *
4588 : * Note that Hot Standby only knows about AccessExclusiveLocks on the primary
4589 : * so any changes that might affect SELECTs running on standbys need to use
4590 : * AccessExclusiveLocks even if you think a lesser lock would do, unless you
4591 : * have a solution for that also.
4592 : *
4593 : * Also note that pg_dump uses only an AccessShareLock, meaning that anything
4594 : * that takes a lock less than AccessExclusiveLock can change object definitions
4595 : * while pg_dump is running. Be careful to check that the appropriate data is
4596 : * derived by pg_dump using an MVCC snapshot, rather than syscache lookups,
4597 : * otherwise we might end up with an inconsistent dump that can't restore.
4598 : */
4599 : LOCKMODE
4600 32588 : AlterTableGetLockLevel(List *cmds)
4601 : {
4602 : /*
4603 : * This only works if we read catalog tables using MVCC snapshots.
4604 : */
4605 : ListCell *lcmd;
4606 32588 : LOCKMODE lockmode = ShareUpdateExclusiveLock;
4607 :
4608 66372 : foreach(lcmd, cmds)
4609 : {
4610 33784 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4611 33784 : LOCKMODE cmd_lockmode = AccessExclusiveLock; /* default for compiler */
4612 :
4613 33784 : switch (cmd->subtype)
4614 : {
4615 : /*
4616 : * These subcommands rewrite the heap, so require full locks.
4617 : */
4618 3622 : case AT_AddColumn: /* may rewrite heap, in some cases and visible
4619 : * to SELECT */
4620 : case AT_SetAccessMethod: /* must rewrite heap */
4621 : case AT_SetTableSpace: /* must rewrite heap */
4622 : case AT_AlterColumnType: /* must rewrite heap */
4623 3622 : cmd_lockmode = AccessExclusiveLock;
4624 3622 : break;
4625 :
4626 : /*
4627 : * These subcommands may require addition of toast tables. If
4628 : * we add a toast table to a table currently being scanned, we
4629 : * might miss data added to the new toast table by concurrent
4630 : * insert transactions.
4631 : */
4632 238 : case AT_SetStorage: /* may add toast tables, see
4633 : * ATRewriteCatalogs() */
4634 238 : cmd_lockmode = AccessExclusiveLock;
4635 238 : break;
4636 :
4637 : /*
4638 : * Removing constraints can affect SELECTs that have been
4639 : * optimized assuming the constraint holds true. See also
4640 : * CloneFkReferenced.
4641 : */
4642 1130 : case AT_DropConstraint: /* as DROP INDEX */
4643 : case AT_DropNotNull: /* may change some SQL plans */
4644 1130 : cmd_lockmode = AccessExclusiveLock;
4645 1130 : break;
4646 :
4647 : /*
4648 : * Subcommands that may be visible to concurrent SELECTs
4649 : */
4650 1758 : case AT_DropColumn: /* change visible to SELECT */
4651 : case AT_AddColumnToView: /* CREATE VIEW */
4652 : case AT_DropOids: /* used to equiv to DropColumn */
4653 : case AT_EnableAlwaysRule: /* may change SELECT rules */
4654 : case AT_EnableReplicaRule: /* may change SELECT rules */
4655 : case AT_EnableRule: /* may change SELECT rules */
4656 : case AT_DisableRule: /* may change SELECT rules */
4657 1758 : cmd_lockmode = AccessExclusiveLock;
4658 1758 : break;
4659 :
4660 : /*
4661 : * Changing owner may remove implicit SELECT privileges
4662 : */
4663 2024 : case AT_ChangeOwner: /* change visible to SELECT */
4664 2024 : cmd_lockmode = AccessExclusiveLock;
4665 2024 : break;
4666 :
4667 : /*
4668 : * Changing foreign table options may affect optimization.
4669 : */
4670 254 : case AT_GenericOptions:
4671 : case AT_AlterColumnGenericOptions:
4672 254 : cmd_lockmode = AccessExclusiveLock;
4673 254 : break;
4674 :
4675 : /*
4676 : * These subcommands affect write operations only.
4677 : */
4678 342 : case AT_EnableTrig:
4679 : case AT_EnableAlwaysTrig:
4680 : case AT_EnableReplicaTrig:
4681 : case AT_EnableTrigAll:
4682 : case AT_EnableTrigUser:
4683 : case AT_DisableTrig:
4684 : case AT_DisableTrigAll:
4685 : case AT_DisableTrigUser:
4686 342 : cmd_lockmode = ShareRowExclusiveLock;
4687 342 : break;
4688 :
4689 : /*
4690 : * These subcommands affect write operations only. XXX
4691 : * Theoretically, these could be ShareRowExclusiveLock.
4692 : */
4693 2942 : case AT_ColumnDefault:
4694 : case AT_CookedColumnDefault:
4695 : case AT_AlterConstraint:
4696 : case AT_AddIndex: /* from ADD CONSTRAINT */
4697 : case AT_AddIndexConstraint:
4698 : case AT_ReplicaIdentity:
4699 : case AT_SetNotNull:
4700 : case AT_EnableRowSecurity:
4701 : case AT_DisableRowSecurity:
4702 : case AT_ForceRowSecurity:
4703 : case AT_NoForceRowSecurity:
4704 : case AT_AddIdentity:
4705 : case AT_DropIdentity:
4706 : case AT_SetIdentity:
4707 : case AT_SetExpression:
4708 : case AT_DropExpression:
4709 : case AT_SetCompression:
4710 2942 : cmd_lockmode = AccessExclusiveLock;
4711 2942 : break;
4712 :
4713 15614 : case AT_AddConstraint:
4714 : case AT_ReAddConstraint: /* becomes AT_AddConstraint */
4715 : case AT_ReAddDomainConstraint: /* becomes AT_AddConstraint */
4716 15614 : if (IsA(cmd->def, Constraint))
4717 : {
4718 15614 : Constraint *con = (Constraint *) cmd->def;
4719 :
4720 15614 : switch (con->contype)
4721 : {
4722 11900 : case CONSTR_EXCLUSION:
4723 : case CONSTR_PRIMARY:
4724 : case CONSTR_UNIQUE:
4725 :
4726 : /*
4727 : * Cases essentially the same as CREATE INDEX. We
4728 : * could reduce the lock strength to ShareLock if
4729 : * we can work out how to allow concurrent catalog
4730 : * updates. XXX Might be set down to
4731 : * ShareRowExclusiveLock but requires further
4732 : * analysis.
4733 : */
4734 11900 : cmd_lockmode = AccessExclusiveLock;
4735 11900 : break;
4736 2594 : case CONSTR_FOREIGN:
4737 :
4738 : /*
4739 : * We add triggers to both tables when we add a
4740 : * Foreign Key, so the lock level must be at least
4741 : * as strong as CREATE TRIGGER.
4742 : */
4743 2594 : cmd_lockmode = ShareRowExclusiveLock;
4744 2594 : break;
4745 :
4746 1120 : default:
4747 1120 : cmd_lockmode = AccessExclusiveLock;
4748 : }
4749 : }
4750 15614 : break;
4751 :
4752 : /*
4753 : * These subcommands affect inheritance behaviour. Queries
4754 : * started before us will continue to see the old inheritance
4755 : * behaviour, while queries started after we commit will see
4756 : * new behaviour. No need to prevent reads or writes to the
4757 : * subtable while we hook it up though. Changing the TupDesc
4758 : * may be a problem, so keep highest lock.
4759 : */
4760 558 : case AT_AddInherit:
4761 : case AT_DropInherit:
4762 558 : cmd_lockmode = AccessExclusiveLock;
4763 558 : break;
4764 :
4765 : /*
4766 : * These subcommands affect implicit row type conversion. They
4767 : * have affects similar to CREATE/DROP CAST on queries. don't
4768 : * provide for invalidating parse trees as a result of such
4769 : * changes, so we keep these at AccessExclusiveLock.
4770 : */
4771 72 : case AT_AddOf:
4772 : case AT_DropOf:
4773 72 : cmd_lockmode = AccessExclusiveLock;
4774 72 : break;
4775 :
4776 : /*
4777 : * Only used by CREATE OR REPLACE VIEW which must conflict
4778 : * with an SELECTs currently using the view.
4779 : */
4780 194 : case AT_ReplaceRelOptions:
4781 194 : cmd_lockmode = AccessExclusiveLock;
4782 194 : break;
4783 :
4784 : /*
4785 : * These subcommands affect general strategies for performance
4786 : * and maintenance, though don't change the semantic results
4787 : * from normal data reads and writes. Delaying an ALTER TABLE
4788 : * behind currently active writes only delays the point where
4789 : * the new strategy begins to take effect, so there is no
4790 : * benefit in waiting. In this case the minimum restriction
4791 : * applies: we don't currently allow concurrent catalog
4792 : * updates.
4793 : */
4794 234 : case AT_SetStatistics: /* Uses MVCC in getTableAttrs() */
4795 : case AT_ClusterOn: /* Uses MVCC in getIndexes() */
4796 : case AT_DropCluster: /* Uses MVCC in getIndexes() */
4797 : case AT_SetOptions: /* Uses MVCC in getTableAttrs() */
4798 : case AT_ResetOptions: /* Uses MVCC in getTableAttrs() */
4799 234 : cmd_lockmode = ShareUpdateExclusiveLock;
4800 234 : break;
4801 :
4802 112 : case AT_SetLogged:
4803 : case AT_SetUnLogged:
4804 112 : cmd_lockmode = AccessExclusiveLock;
4805 112 : break;
4806 :
4807 476 : case AT_ValidateConstraint: /* Uses MVCC in getConstraints() */
4808 476 : cmd_lockmode = ShareUpdateExclusiveLock;
4809 476 : break;
4810 :
4811 : /*
4812 : * Rel options are more complex than first appears. Options
4813 : * are set here for tables, views and indexes; for historical
4814 : * reasons these can all be used with ALTER TABLE, so we can't
4815 : * decide between them using the basic grammar.
4816 : */
4817 770 : case AT_SetRelOptions: /* Uses MVCC in getIndexes() and
4818 : * getTables() */
4819 : case AT_ResetRelOptions: /* Uses MVCC in getIndexes() and
4820 : * getTables() */
4821 770 : cmd_lockmode = AlterTableGetRelOptionsLockLevel((List *) cmd->def);
4822 770 : break;
4823 :
4824 2828 : case AT_AttachPartition:
4825 2828 : cmd_lockmode = ShareUpdateExclusiveLock;
4826 2828 : break;
4827 :
4828 596 : case AT_DetachPartition:
4829 596 : if (((PartitionCmd *) cmd->def)->concurrent)
4830 164 : cmd_lockmode = ShareUpdateExclusiveLock;
4831 : else
4832 432 : cmd_lockmode = AccessExclusiveLock;
4833 596 : break;
4834 :
4835 20 : case AT_DetachPartitionFinalize:
4836 20 : cmd_lockmode = ShareUpdateExclusiveLock;
4837 20 : break;
4838 :
4839 0 : default: /* oops */
4840 0 : elog(ERROR, "unrecognized alter table type: %d",
4841 : (int) cmd->subtype);
4842 : break;
4843 : }
4844 :
4845 : /*
4846 : * Take the greatest lockmode from any subcommand
4847 : */
4848 33784 : if (cmd_lockmode > lockmode)
4849 28284 : lockmode = cmd_lockmode;
4850 : }
4851 :
4852 32588 : return lockmode;
4853 : }
4854 :
4855 : /*
4856 : * ATController provides top level control over the phases.
4857 : *
4858 : * parsetree is passed in to allow it to be passed to event triggers
4859 : * when requested.
4860 : */
4861 : static void
4862 32344 : ATController(AlterTableStmt *parsetree,
4863 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
4864 : AlterTableUtilityContext *context)
4865 : {
4866 32344 : List *wqueue = NIL;
4867 : ListCell *lcmd;
4868 :
4869 : /* Phase 1: preliminary examination of commands, create work queue */
4870 65472 : foreach(lcmd, cmds)
4871 : {
4872 33534 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4873 :
4874 33534 : ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode, context);
4875 : }
4876 :
4877 : /* Close the relation, but keep lock until commit */
4878 31938 : relation_close(rel, NoLock);
4879 :
4880 : /* Phase 2: update system catalogs */
4881 31938 : ATRewriteCatalogs(&wqueue, lockmode, context);
4882 :
4883 : /* Phase 3: scan/rewrite tables as needed, and run afterStmts */
4884 29116 : ATRewriteTables(parsetree, &wqueue, lockmode, context);
4885 28642 : }
4886 :
4887 : /*
4888 : * ATPrepCmd
4889 : *
4890 : * Traffic cop for ALTER TABLE Phase 1 operations, including simple
4891 : * recursion and permission checks.
4892 : *
4893 : * Caller must have acquired appropriate lock type on relation already.
4894 : * This lock should be held until commit.
4895 : */
4896 : static void
4897 34474 : ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
4898 : bool recurse, bool recursing, LOCKMODE lockmode,
4899 : AlterTableUtilityContext *context)
4900 : {
4901 : AlteredTableInfo *tab;
4902 34474 : AlterTablePass pass = AT_PASS_UNSET;
4903 :
4904 : /* Find or create work queue entry for this table */
4905 34474 : tab = ATGetQueueEntry(wqueue, rel);
4906 :
4907 : /*
4908 : * Disallow any ALTER TABLE other than ALTER TABLE DETACH FINALIZE on
4909 : * partitions that are pending detach.
4910 : */
4911 34474 : if (rel->rd_rel->relispartition &&
4912 2692 : cmd->subtype != AT_DetachPartitionFinalize &&
4913 1346 : PartitionHasPendingDetach(RelationGetRelid(rel)))
4914 2 : ereport(ERROR,
4915 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
4916 : errmsg("cannot alter partition \"%s\" with an incomplete detach",
4917 : RelationGetRelationName(rel)),
4918 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
4919 :
4920 : /*
4921 : * Copy the original subcommand for each table, so we can scribble on it.
4922 : * This avoids conflicts when different child tables need to make
4923 : * different parse transformations (for example, the same column may have
4924 : * different column numbers in different children).
4925 : */
4926 34472 : cmd = copyObject(cmd);
4927 :
4928 : /*
4929 : * Do permissions and relkind checking, recursion to child tables if
4930 : * needed, and any additional phase-1 processing needed. (But beware of
4931 : * adding any processing that looks at table details that another
4932 : * subcommand could change. In some cases we reject multiple subcommands
4933 : * that could try to change the same state in contrary ways.)
4934 : */
4935 34472 : switch (cmd->subtype)
4936 : {
4937 2190 : case AT_AddColumn: /* ADD COLUMN */
4938 2190 : ATSimplePermissions(cmd->subtype, rel,
4939 : ATT_TABLE | ATT_PARTITIONED_TABLE |
4940 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
4941 2190 : ATPrepAddColumn(wqueue, rel, recurse, recursing, false, cmd,
4942 : lockmode, context);
4943 : /* Recursion occurs during execution phase */
4944 2178 : pass = AT_PASS_ADD_COL;
4945 2178 : break;
4946 24 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
4947 24 : ATSimplePermissions(cmd->subtype, rel, ATT_VIEW);
4948 24 : ATPrepAddColumn(wqueue, rel, recurse, recursing, true, cmd,
4949 : lockmode, context);
4950 : /* Recursion occurs during execution phase */
4951 24 : pass = AT_PASS_ADD_COL;
4952 24 : break;
4953 620 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
4954 :
4955 : /*
4956 : * We allow defaults on views so that INSERT into a view can have
4957 : * default-ish behavior. This works because the rewriter
4958 : * substitutes default values into INSERTs before it expands
4959 : * rules.
4960 : */
4961 620 : ATSimplePermissions(cmd->subtype, rel,
4962 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4963 : ATT_FOREIGN_TABLE);
4964 620 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
4965 : /* No command-specific prep needed */
4966 620 : pass = cmd->def ? AT_PASS_ADD_OTHERCONSTR : AT_PASS_DROP;
4967 620 : break;
4968 80 : case AT_CookedColumnDefault: /* add a pre-cooked default */
4969 : /* This is currently used only in CREATE TABLE */
4970 : /* (so the permission check really isn't necessary) */
4971 80 : ATSimplePermissions(cmd->subtype, rel,
4972 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
4973 : /* This command never recurses */
4974 80 : pass = AT_PASS_ADD_OTHERCONSTR;
4975 80 : break;
4976 166 : case AT_AddIdentity:
4977 166 : ATSimplePermissions(cmd->subtype, rel,
4978 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4979 : ATT_FOREIGN_TABLE);
4980 : /* Set up recursion for phase 2; no other prep needed */
4981 166 : if (recurse)
4982 160 : cmd->recurse = true;
4983 166 : pass = AT_PASS_ADD_OTHERCONSTR;
4984 166 : break;
4985 62 : case AT_SetIdentity:
4986 62 : ATSimplePermissions(cmd->subtype, rel,
4987 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4988 : ATT_FOREIGN_TABLE);
4989 : /* Set up recursion for phase 2; no other prep needed */
4990 62 : if (recurse)
4991 56 : cmd->recurse = true;
4992 : /* This should run after AddIdentity, so do it in MISC pass */
4993 62 : pass = AT_PASS_MISC;
4994 62 : break;
4995 56 : case AT_DropIdentity:
4996 56 : ATSimplePermissions(cmd->subtype, rel,
4997 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4998 : ATT_FOREIGN_TABLE);
4999 : /* Set up recursion for phase 2; no other prep needed */
5000 56 : if (recurse)
5001 50 : cmd->recurse = true;
5002 56 : pass = AT_PASS_DROP;
5003 56 : break;
5004 274 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5005 274 : ATSimplePermissions(cmd->subtype, rel,
5006 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5007 : /* Set up recursion for phase 2; no other prep needed */
5008 268 : if (recurse)
5009 250 : cmd->recurse = true;
5010 268 : pass = AT_PASS_DROP;
5011 268 : break;
5012 420 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5013 420 : ATSimplePermissions(cmd->subtype, rel,
5014 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5015 : /* Set up recursion for phase 2; no other prep needed */
5016 414 : if (recurse)
5017 384 : cmd->recurse = true;
5018 414 : pass = AT_PASS_COL_ATTRS;
5019 414 : break;
5020 216 : case AT_SetExpression: /* ALTER COLUMN SET EXPRESSION */
5021 216 : ATSimplePermissions(cmd->subtype, rel,
5022 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5023 216 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5024 216 : pass = AT_PASS_SET_EXPRESSION;
5025 216 : break;
5026 86 : case AT_DropExpression: /* ALTER COLUMN DROP EXPRESSION */
5027 86 : ATSimplePermissions(cmd->subtype, rel,
5028 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5029 86 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5030 86 : ATPrepDropExpression(rel, cmd, recurse, recursing, lockmode);
5031 62 : pass = AT_PASS_DROP;
5032 62 : break;
5033 164 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5034 164 : ATSimplePermissions(cmd->subtype, rel,
5035 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW |
5036 : ATT_INDEX | ATT_PARTITIONED_INDEX | ATT_FOREIGN_TABLE);
5037 164 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5038 : /* No command-specific prep needed */
5039 164 : pass = AT_PASS_MISC;
5040 164 : break;
5041 44 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5042 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5043 44 : ATSimplePermissions(cmd->subtype, rel,
5044 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5045 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5046 : /* This command never recurses */
5047 32 : pass = AT_PASS_MISC;
5048 32 : break;
5049 260 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5050 260 : ATSimplePermissions(cmd->subtype, rel,
5051 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5052 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5053 260 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5054 : /* No command-specific prep needed */
5055 260 : pass = AT_PASS_MISC;
5056 260 : break;
5057 78 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5058 78 : ATSimplePermissions(cmd->subtype, rel,
5059 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5060 : /* This command never recurses */
5061 : /* No command-specific prep needed */
5062 78 : pass = AT_PASS_MISC;
5063 78 : break;
5064 1664 : case AT_DropColumn: /* DROP COLUMN */
5065 1664 : ATSimplePermissions(cmd->subtype, rel,
5066 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5067 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5068 1658 : ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd,
5069 : lockmode, context);
5070 : /* Recursion occurs during execution phase */
5071 1646 : pass = AT_PASS_DROP;
5072 1646 : break;
5073 0 : case AT_AddIndex: /* ADD INDEX */
5074 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5075 : /* This command never recurses */
5076 : /* No command-specific prep needed */
5077 0 : pass = AT_PASS_ADD_INDEX;
5078 0 : break;
5079 16078 : case AT_AddConstraint: /* ADD CONSTRAINT */
5080 16078 : ATSimplePermissions(cmd->subtype, rel,
5081 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5082 16078 : ATPrepAddPrimaryKey(wqueue, rel, cmd, recurse, lockmode, context);
5083 16048 : if (recurse)
5084 : {
5085 : /* recurses at exec time; lock descendants and set flag */
5086 15680 : (void) find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
5087 15680 : cmd->recurse = true;
5088 : }
5089 16048 : pass = AT_PASS_ADD_CONSTR;
5090 16048 : break;
5091 0 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5092 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5093 : /* This command never recurses */
5094 : /* No command-specific prep needed */
5095 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5096 0 : break;
5097 818 : case AT_DropConstraint: /* DROP CONSTRAINT */
5098 818 : ATSimplePermissions(cmd->subtype, rel,
5099 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5100 818 : ATCheckPartitionsNotInUse(rel, lockmode);
5101 : /* Other recursion occurs during execution phase */
5102 : /* No command-specific prep needed except saving recurse flag */
5103 812 : if (recurse)
5104 776 : cmd->recurse = true;
5105 812 : pass = AT_PASS_DROP;
5106 812 : break;
5107 1318 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5108 1318 : ATSimplePermissions(cmd->subtype, rel,
5109 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5110 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5111 : /* See comments for ATPrepAlterColumnType */
5112 1318 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, recurse, lockmode,
5113 : AT_PASS_UNSET, context);
5114 : Assert(cmd != NULL);
5115 : /* Performs own recursion */
5116 1312 : ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd,
5117 : lockmode, context);
5118 1114 : pass = AT_PASS_ALTER_TYPE;
5119 1114 : break;
5120 172 : case AT_AlterColumnGenericOptions:
5121 172 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5122 : /* This command never recurses */
5123 : /* No command-specific prep needed */
5124 172 : pass = AT_PASS_MISC;
5125 172 : break;
5126 2000 : case AT_ChangeOwner: /* ALTER OWNER */
5127 : /* This command never recurses */
5128 : /* No command-specific prep needed */
5129 2000 : pass = AT_PASS_MISC;
5130 2000 : break;
5131 64 : case AT_ClusterOn: /* CLUSTER ON */
5132 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5133 64 : ATSimplePermissions(cmd->subtype, rel,
5134 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5135 : /* These commands never recurse */
5136 : /* No command-specific prep needed */
5137 64 : pass = AT_PASS_MISC;
5138 64 : break;
5139 112 : case AT_SetLogged: /* SET LOGGED */
5140 : case AT_SetUnLogged: /* SET UNLOGGED */
5141 112 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
5142 100 : if (tab->chgPersistence)
5143 0 : ereport(ERROR,
5144 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5145 : errmsg("cannot change persistence setting twice")));
5146 100 : ATPrepChangePersistence(tab, rel, cmd->subtype == AT_SetLogged);
5147 88 : pass = AT_PASS_MISC;
5148 88 : break;
5149 6 : case AT_DropOids: /* SET WITHOUT OIDS */
5150 6 : ATSimplePermissions(cmd->subtype, rel,
5151 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5152 6 : pass = AT_PASS_DROP;
5153 6 : break;
5154 128 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5155 128 : ATSimplePermissions(cmd->subtype, rel,
5156 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5157 :
5158 : /* check if another access method change was already requested */
5159 128 : if (tab->chgAccessMethod)
5160 18 : ereport(ERROR,
5161 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5162 : errmsg("cannot have multiple SET ACCESS METHOD subcommands")));
5163 :
5164 110 : ATPrepSetAccessMethod(tab, rel, cmd->name);
5165 110 : pass = AT_PASS_MISC; /* does not matter; no work in Phase 2 */
5166 110 : break;
5167 158 : case AT_SetTableSpace: /* SET TABLESPACE */
5168 158 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE |
5169 : ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX);
5170 : /* This command never recurses */
5171 158 : ATPrepSetTableSpace(tab, rel, cmd->name, lockmode);
5172 158 : pass = AT_PASS_MISC; /* doesn't actually matter */
5173 158 : break;
5174 962 : case AT_SetRelOptions: /* SET (...) */
5175 : case AT_ResetRelOptions: /* RESET (...) */
5176 : case AT_ReplaceRelOptions: /* reset them all, then set just these */
5177 962 : ATSimplePermissions(cmd->subtype, rel,
5178 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5179 : ATT_MATVIEW | ATT_INDEX);
5180 : /* This command never recurses */
5181 : /* No command-specific prep needed */
5182 960 : pass = AT_PASS_MISC;
5183 960 : break;
5184 464 : case AT_AddInherit: /* INHERIT */
5185 464 : ATSimplePermissions(cmd->subtype, rel,
5186 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5187 : /* This command never recurses */
5188 464 : ATPrepAddInherit(rel);
5189 446 : pass = AT_PASS_MISC;
5190 446 : break;
5191 94 : case AT_DropInherit: /* NO INHERIT */
5192 94 : ATSimplePermissions(cmd->subtype, rel,
5193 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5194 : /* This command never recurses */
5195 : /* No command-specific prep needed */
5196 94 : pass = AT_PASS_MISC;
5197 94 : break;
5198 294 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5199 294 : ATSimplePermissions(cmd->subtype, rel,
5200 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5201 : /* Recursion occurs during execution phase */
5202 288 : if (recurse)
5203 288 : cmd->recurse = true;
5204 288 : pass = AT_PASS_MISC;
5205 288 : break;
5206 476 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5207 476 : ATSimplePermissions(cmd->subtype, rel,
5208 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5209 : /* Recursion occurs during execution phase */
5210 : /* No command-specific prep needed except saving recurse flag */
5211 476 : if (recurse)
5212 476 : cmd->recurse = true;
5213 476 : pass = AT_PASS_MISC;
5214 476 : break;
5215 494 : case AT_ReplicaIdentity: /* REPLICA IDENTITY ... */
5216 494 : ATSimplePermissions(cmd->subtype, rel,
5217 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5218 494 : pass = AT_PASS_MISC;
5219 : /* This command never recurses */
5220 : /* No command-specific prep needed */
5221 494 : break;
5222 342 : case AT_EnableTrig: /* ENABLE TRIGGER variants */
5223 : case AT_EnableAlwaysTrig:
5224 : case AT_EnableReplicaTrig:
5225 : case AT_EnableTrigAll:
5226 : case AT_EnableTrigUser:
5227 : case AT_DisableTrig: /* DISABLE TRIGGER variants */
5228 : case AT_DisableTrigAll:
5229 : case AT_DisableTrigUser:
5230 342 : ATSimplePermissions(cmd->subtype, rel,
5231 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5232 : /* Set up recursion for phase 2; no other prep needed */
5233 342 : if (recurse)
5234 314 : cmd->recurse = true;
5235 342 : pass = AT_PASS_MISC;
5236 342 : break;
5237 598 : case AT_EnableRule: /* ENABLE/DISABLE RULE variants */
5238 : case AT_EnableAlwaysRule:
5239 : case AT_EnableReplicaRule:
5240 : case AT_DisableRule:
5241 : case AT_AddOf: /* OF */
5242 : case AT_DropOf: /* NOT OF */
5243 : case AT_EnableRowSecurity:
5244 : case AT_DisableRowSecurity:
5245 : case AT_ForceRowSecurity:
5246 : case AT_NoForceRowSecurity:
5247 598 : ATSimplePermissions(cmd->subtype, rel,
5248 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5249 : /* These commands never recurse */
5250 : /* No command-specific prep needed */
5251 598 : pass = AT_PASS_MISC;
5252 598 : break;
5253 58 : case AT_GenericOptions:
5254 58 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5255 : /* No command-specific prep needed */
5256 58 : pass = AT_PASS_MISC;
5257 58 : break;
5258 2816 : case AT_AttachPartition:
5259 2816 : ATSimplePermissions(cmd->subtype, rel,
5260 : ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
5261 : /* No command-specific prep needed */
5262 2810 : pass = AT_PASS_MISC;
5263 2810 : break;
5264 596 : case AT_DetachPartition:
5265 596 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5266 : /* No command-specific prep needed */
5267 578 : pass = AT_PASS_MISC;
5268 578 : break;
5269 20 : case AT_DetachPartitionFinalize:
5270 20 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5271 : /* No command-specific prep needed */
5272 14 : pass = AT_PASS_MISC;
5273 14 : break;
5274 0 : default: /* oops */
5275 0 : elog(ERROR, "unrecognized alter table type: %d",
5276 : (int) cmd->subtype);
5277 : pass = AT_PASS_UNSET; /* keep compiler quiet */
5278 : break;
5279 : }
5280 : Assert(pass > AT_PASS_UNSET);
5281 :
5282 : /* Add the subcommand to the appropriate list for phase 2 */
5283 34056 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd);
5284 34056 : }
5285 :
5286 : /*
5287 : * ATRewriteCatalogs
5288 : *
5289 : * Traffic cop for ALTER TABLE Phase 2 operations. Subcommands are
5290 : * dispatched in a "safe" execution order (designed to avoid unnecessary
5291 : * conflicts).
5292 : */
5293 : static void
5294 31938 : ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
5295 : AlterTableUtilityContext *context)
5296 : {
5297 : ListCell *ltab;
5298 :
5299 : /*
5300 : * We process all the tables "in parallel", one pass at a time. This is
5301 : * needed because we may have to propagate work from one table to another
5302 : * (specifically, ALTER TYPE on a foreign key's PK has to dispatch the
5303 : * re-adding of the foreign key constraint to the other table). Work can
5304 : * only be propagated into later passes, however.
5305 : */
5306 402598 : for (AlterTablePass pass = 0; pass < AT_NUM_PASSES; pass++)
5307 : {
5308 : /* Go through each table that needs to be processed */
5309 760124 : foreach(ltab, *wqueue)
5310 : {
5311 389464 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5312 389464 : List *subcmds = tab->subcmds[pass];
5313 : ListCell *lcmd;
5314 :
5315 389464 : if (subcmds == NIL)
5316 333940 : continue;
5317 :
5318 : /*
5319 : * Open the relation and store it in tab. This allows subroutines
5320 : * close and reopen, if necessary. Appropriate lock was obtained
5321 : * by phase 1, needn't get it again.
5322 : */
5323 55524 : tab->rel = relation_open(tab->relid, NoLock);
5324 :
5325 111932 : foreach(lcmd, subcmds)
5326 59230 : ATExecCmd(wqueue, tab,
5327 59230 : lfirst_node(AlterTableCmd, lcmd),
5328 : lockmode, pass, context);
5329 :
5330 : /*
5331 : * After the ALTER TYPE or SET EXPRESSION pass, do cleanup work
5332 : * (this is not done in ATExecAlterColumnType since it should be
5333 : * done only once if multiple columns of a table are altered).
5334 : */
5335 52702 : if (pass == AT_PASS_ALTER_TYPE || pass == AT_PASS_SET_EXPRESSION)
5336 1180 : ATPostAlterTypeCleanup(wqueue, tab, lockmode);
5337 :
5338 52702 : if (tab->rel)
5339 : {
5340 52702 : relation_close(tab->rel, NoLock);
5341 52702 : tab->rel = NULL;
5342 : }
5343 : }
5344 : }
5345 :
5346 : /* Check to see if a toast table must be added. */
5347 62376 : foreach(ltab, *wqueue)
5348 : {
5349 33260 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5350 :
5351 : /*
5352 : * If the table is source table of ATTACH PARTITION command, we did
5353 : * not modify anything about it that will change its toasting
5354 : * requirement, so no need to check.
5355 : */
5356 33260 : if (((tab->relkind == RELKIND_RELATION ||
5357 6124 : tab->relkind == RELKIND_PARTITIONED_TABLE) &&
5358 31358 : tab->partition_constraint == NULL) ||
5359 3972 : tab->relkind == RELKIND_MATVIEW)
5360 29338 : AlterTableCreateToastTable(tab->relid, (Datum) 0, lockmode);
5361 : }
5362 29116 : }
5363 :
5364 : /*
5365 : * ATExecCmd: dispatch a subcommand to appropriate execution routine
5366 : */
5367 : static void
5368 59230 : ATExecCmd(List **wqueue, AlteredTableInfo *tab,
5369 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
5370 : AlterTableUtilityContext *context)
5371 : {
5372 59230 : ObjectAddress address = InvalidObjectAddress;
5373 59230 : Relation rel = tab->rel;
5374 :
5375 59230 : switch (cmd->subtype)
5376 : {
5377 2196 : case AT_AddColumn: /* ADD COLUMN */
5378 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
5379 2196 : address = ATExecAddColumn(wqueue, tab, rel, &cmd,
5380 2196 : cmd->recurse, false,
5381 : lockmode, cur_pass, context);
5382 2058 : break;
5383 584 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
5384 584 : address = ATExecColumnDefault(rel, cmd->name, cmd->def, lockmode);
5385 518 : break;
5386 80 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5387 80 : address = ATExecCookedColumnDefault(rel, cmd->num, cmd->def);
5388 80 : break;
5389 166 : case AT_AddIdentity:
5390 166 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5391 : cur_pass, context);
5392 : Assert(cmd != NULL);
5393 154 : address = ATExecAddIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5394 106 : break;
5395 62 : case AT_SetIdentity:
5396 62 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5397 : cur_pass, context);
5398 : Assert(cmd != NULL);
5399 62 : address = ATExecSetIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5400 38 : break;
5401 56 : case AT_DropIdentity:
5402 56 : address = ATExecDropIdentity(rel, cmd->name, cmd->missing_ok, lockmode, cmd->recurse, false);
5403 38 : break;
5404 268 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5405 268 : address = ATExecDropNotNull(rel, cmd->name, cmd->recurse, lockmode);
5406 166 : break;
5407 414 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5408 414 : address = ATExecSetNotNull(wqueue, rel, NULL, cmd->name,
5409 414 : cmd->recurse, false, lockmode);
5410 384 : break;
5411 216 : case AT_SetExpression:
5412 216 : address = ATExecSetExpression(tab, rel, cmd->name, cmd->def, lockmode);
5413 186 : break;
5414 56 : case AT_DropExpression:
5415 56 : address = ATExecDropExpression(rel, cmd->name, cmd->missing_ok, lockmode);
5416 32 : break;
5417 164 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5418 164 : address = ATExecSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
5419 116 : break;
5420 26 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5421 26 : address = ATExecSetOptions(rel, cmd->name, cmd->def, false, lockmode);
5422 26 : break;
5423 6 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5424 6 : address = ATExecSetOptions(rel, cmd->name, cmd->def, true, lockmode);
5425 6 : break;
5426 260 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5427 260 : address = ATExecSetStorage(rel, cmd->name, cmd->def, lockmode);
5428 248 : break;
5429 78 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5430 78 : address = ATExecSetCompression(rel, cmd->name, cmd->def,
5431 : lockmode);
5432 72 : break;
5433 1646 : case AT_DropColumn: /* DROP COLUMN */
5434 1646 : address = ATExecDropColumn(wqueue, rel, cmd->name,
5435 1646 : cmd->behavior, cmd->recurse, false,
5436 1646 : cmd->missing_ok, lockmode,
5437 : NULL);
5438 1466 : break;
5439 1178 : case AT_AddIndex: /* ADD INDEX */
5440 1178 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, false,
5441 : lockmode);
5442 1008 : break;
5443 456 : case AT_ReAddIndex: /* ADD INDEX */
5444 456 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, true,
5445 : lockmode);
5446 456 : break;
5447 26 : case AT_ReAddStatistics: /* ADD STATISTICS */
5448 26 : address = ATExecAddStatistics(tab, rel, (CreateStatsStmt *) cmd->def,
5449 : true, lockmode);
5450 26 : break;
5451 28558 : case AT_AddConstraint: /* ADD CONSTRAINT */
5452 : /* Transform the command only during initial examination */
5453 28558 : if (cur_pass == AT_PASS_ADD_CONSTR)
5454 16018 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd,
5455 16048 : cmd->recurse, lockmode,
5456 : cur_pass, context);
5457 : /* Depending on constraint type, might be no more work to do now */
5458 28528 : if (cmd != NULL)
5459 : address =
5460 12510 : ATExecAddConstraint(wqueue, tab, rel,
5461 12510 : (Constraint *) cmd->def,
5462 12510 : cmd->recurse, false, lockmode);
5463 27848 : break;
5464 338 : case AT_ReAddConstraint: /* Re-add pre-existing check constraint */
5465 : address =
5466 338 : ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
5467 : true, true, lockmode);
5468 326 : break;
5469 14 : case AT_ReAddDomainConstraint: /* Re-add pre-existing domain check
5470 : * constraint */
5471 : address =
5472 14 : AlterDomainAddConstraint(((AlterDomainStmt *) cmd->def)->typeName,
5473 14 : ((AlterDomainStmt *) cmd->def)->def,
5474 : NULL);
5475 8 : break;
5476 78 : case AT_ReAddComment: /* Re-add existing comment */
5477 78 : address = CommentObject((CommentStmt *) cmd->def);
5478 78 : break;
5479 10640 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5480 10640 : address = ATExecAddIndexConstraint(tab, rel, (IndexStmt *) cmd->def,
5481 : lockmode);
5482 10628 : break;
5483 288 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5484 288 : address = ATExecAlterConstraint(wqueue, rel,
5485 288 : castNode(ATAlterConstraint, cmd->def),
5486 288 : cmd->recurse, lockmode);
5487 222 : break;
5488 476 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5489 476 : address = ATExecValidateConstraint(wqueue, rel, cmd->name, cmd->recurse,
5490 : false, lockmode);
5491 470 : break;
5492 812 : case AT_DropConstraint: /* DROP CONSTRAINT */
5493 812 : ATExecDropConstraint(rel, cmd->name, cmd->behavior,
5494 812 : cmd->recurse,
5495 812 : cmd->missing_ok, lockmode);
5496 602 : break;
5497 1078 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5498 : /* parse transformation was done earlier */
5499 1078 : address = ATExecAlterColumnType(tab, rel, cmd, lockmode);
5500 1036 : break;
5501 172 : case AT_AlterColumnGenericOptions: /* ALTER COLUMN OPTIONS */
5502 : address =
5503 172 : ATExecAlterColumnGenericOptions(rel, cmd->name,
5504 172 : (List *) cmd->def, lockmode);
5505 166 : break;
5506 2000 : case AT_ChangeOwner: /* ALTER OWNER */
5507 1994 : ATExecChangeOwner(RelationGetRelid(rel),
5508 2000 : get_rolespec_oid(cmd->newowner, false),
5509 : false, lockmode);
5510 1982 : break;
5511 64 : case AT_ClusterOn: /* CLUSTER ON */
5512 64 : address = ATExecClusterOn(rel, cmd->name, lockmode);
5513 58 : break;
5514 18 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5515 18 : ATExecDropCluster(rel, lockmode);
5516 12 : break;
5517 88 : case AT_SetLogged: /* SET LOGGED */
5518 : case AT_SetUnLogged: /* SET UNLOGGED */
5519 88 : break;
5520 6 : case AT_DropOids: /* SET WITHOUT OIDS */
5521 : /* nothing to do here, oid columns don't exist anymore */
5522 6 : break;
5523 92 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5524 :
5525 : /*
5526 : * Only do this for partitioned tables, for which this is just a
5527 : * catalog change. Tables with storage are handled by Phase 3.
5528 : */
5529 92 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
5530 50 : tab->chgAccessMethod)
5531 44 : ATExecSetAccessMethodNoStorage(rel, tab->newAccessMethod);
5532 92 : break;
5533 158 : case AT_SetTableSpace: /* SET TABLESPACE */
5534 :
5535 : /*
5536 : * Only do this for partitioned tables and indexes, for which this
5537 : * is just a catalog change. Other relation types which have
5538 : * storage are handled by Phase 3.
5539 : */
5540 158 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
5541 146 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
5542 36 : ATExecSetTableSpaceNoStorage(rel, tab->newTableSpace);
5543 :
5544 152 : break;
5545 960 : case AT_SetRelOptions: /* SET (...) */
5546 : case AT_ResetRelOptions: /* RESET (...) */
5547 : case AT_ReplaceRelOptions: /* replace entire option list */
5548 960 : ATExecSetRelOptions(rel, (List *) cmd->def, cmd->subtype, lockmode);
5549 908 : break;
5550 122 : case AT_EnableTrig: /* ENABLE TRIGGER name */
5551 122 : ATExecEnableDisableTrigger(rel, cmd->name,
5552 : TRIGGER_FIRES_ON_ORIGIN, false,
5553 122 : cmd->recurse,
5554 : lockmode);
5555 122 : break;
5556 42 : case AT_EnableAlwaysTrig: /* ENABLE ALWAYS TRIGGER name */
5557 42 : ATExecEnableDisableTrigger(rel, cmd->name,
5558 : TRIGGER_FIRES_ALWAYS, false,
5559 42 : cmd->recurse,
5560 : lockmode);
5561 42 : break;
5562 16 : case AT_EnableReplicaTrig: /* ENABLE REPLICA TRIGGER name */
5563 16 : ATExecEnableDisableTrigger(rel, cmd->name,
5564 : TRIGGER_FIRES_ON_REPLICA, false,
5565 16 : cmd->recurse,
5566 : lockmode);
5567 16 : break;
5568 138 : case AT_DisableTrig: /* DISABLE TRIGGER name */
5569 138 : ATExecEnableDisableTrigger(rel, cmd->name,
5570 : TRIGGER_DISABLED, false,
5571 138 : cmd->recurse,
5572 : lockmode);
5573 138 : break;
5574 0 : case AT_EnableTrigAll: /* ENABLE TRIGGER ALL */
5575 0 : ATExecEnableDisableTrigger(rel, NULL,
5576 : TRIGGER_FIRES_ON_ORIGIN, false,
5577 0 : cmd->recurse,
5578 : lockmode);
5579 0 : break;
5580 12 : case AT_DisableTrigAll: /* DISABLE TRIGGER ALL */
5581 12 : ATExecEnableDisableTrigger(rel, NULL,
5582 : TRIGGER_DISABLED, false,
5583 12 : cmd->recurse,
5584 : lockmode);
5585 12 : break;
5586 0 : case AT_EnableTrigUser: /* ENABLE TRIGGER USER */
5587 0 : ATExecEnableDisableTrigger(rel, NULL,
5588 : TRIGGER_FIRES_ON_ORIGIN, true,
5589 0 : cmd->recurse,
5590 : lockmode);
5591 0 : break;
5592 12 : case AT_DisableTrigUser: /* DISABLE TRIGGER USER */
5593 12 : ATExecEnableDisableTrigger(rel, NULL,
5594 : TRIGGER_DISABLED, true,
5595 12 : cmd->recurse,
5596 : lockmode);
5597 12 : break;
5598 :
5599 8 : case AT_EnableRule: /* ENABLE RULE name */
5600 8 : ATExecEnableDisableRule(rel, cmd->name,
5601 : RULE_FIRES_ON_ORIGIN, lockmode);
5602 8 : break;
5603 0 : case AT_EnableAlwaysRule: /* ENABLE ALWAYS RULE name */
5604 0 : ATExecEnableDisableRule(rel, cmd->name,
5605 : RULE_FIRES_ALWAYS, lockmode);
5606 0 : break;
5607 6 : case AT_EnableReplicaRule: /* ENABLE REPLICA RULE name */
5608 6 : ATExecEnableDisableRule(rel, cmd->name,
5609 : RULE_FIRES_ON_REPLICA, lockmode);
5610 6 : break;
5611 32 : case AT_DisableRule: /* DISABLE RULE name */
5612 32 : ATExecEnableDisableRule(rel, cmd->name,
5613 : RULE_DISABLED, lockmode);
5614 32 : break;
5615 :
5616 446 : case AT_AddInherit:
5617 446 : address = ATExecAddInherit(rel, (RangeVar *) cmd->def, lockmode);
5618 326 : break;
5619 94 : case AT_DropInherit:
5620 94 : address = ATExecDropInherit(rel, (RangeVar *) cmd->def, lockmode);
5621 88 : break;
5622 66 : case AT_AddOf:
5623 66 : address = ATExecAddOf(rel, (TypeName *) cmd->def, lockmode);
5624 30 : break;
5625 6 : case AT_DropOf:
5626 6 : ATExecDropOf(rel, lockmode);
5627 6 : break;
5628 512 : case AT_ReplicaIdentity:
5629 512 : ATExecReplicaIdentity(rel, (ReplicaIdentityStmt *) cmd->def, lockmode);
5630 464 : break;
5631 338 : case AT_EnableRowSecurity:
5632 338 : ATExecSetRowSecurity(rel, true);
5633 338 : break;
5634 10 : case AT_DisableRowSecurity:
5635 10 : ATExecSetRowSecurity(rel, false);
5636 10 : break;
5637 100 : case AT_ForceRowSecurity:
5638 100 : ATExecForceNoForceRowSecurity(rel, true);
5639 100 : break;
5640 32 : case AT_NoForceRowSecurity:
5641 32 : ATExecForceNoForceRowSecurity(rel, false);
5642 32 : break;
5643 58 : case AT_GenericOptions:
5644 58 : ATExecGenericOptions(rel, (List *) cmd->def);
5645 56 : break;
5646 2810 : case AT_AttachPartition:
5647 2810 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5648 : cur_pass, context);
5649 : Assert(cmd != NULL);
5650 2786 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
5651 2406 : address = ATExecAttachPartition(wqueue, rel, (PartitionCmd *) cmd->def,
5652 : context);
5653 : else
5654 380 : address = ATExecAttachPartitionIdx(wqueue, rel,
5655 380 : ((PartitionCmd *) cmd->def)->name);
5656 2396 : break;
5657 578 : case AT_DetachPartition:
5658 578 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5659 : cur_pass, context);
5660 : Assert(cmd != NULL);
5661 : /* ATPrepCmd ensures it must be a table */
5662 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5663 578 : address = ATExecDetachPartition(wqueue, tab, rel,
5664 578 : ((PartitionCmd *) cmd->def)->name,
5665 578 : ((PartitionCmd *) cmd->def)->concurrent);
5666 448 : break;
5667 14 : case AT_DetachPartitionFinalize:
5668 14 : address = ATExecDetachPartitionFinalize(rel, ((PartitionCmd *) cmd->def)->name);
5669 14 : break;
5670 0 : default: /* oops */
5671 0 : elog(ERROR, "unrecognized alter table type: %d",
5672 : (int) cmd->subtype);
5673 : break;
5674 : }
5675 :
5676 : /*
5677 : * Report the subcommand to interested event triggers.
5678 : */
5679 56408 : if (cmd)
5680 40390 : EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
5681 :
5682 : /*
5683 : * Bump the command counter to ensure the next subcommand in the sequence
5684 : * can see the changes so far
5685 : */
5686 56408 : CommandCounterIncrement();
5687 56408 : }
5688 :
5689 : /*
5690 : * ATParseTransformCmd: perform parse transformation for one subcommand
5691 : *
5692 : * Returns the transformed subcommand tree, if there is one, else NULL.
5693 : *
5694 : * The parser may hand back additional AlterTableCmd(s) and/or other
5695 : * utility statements, either before or after the original subcommand.
5696 : * Other AlterTableCmds are scheduled into the appropriate slot of the
5697 : * AlteredTableInfo (they had better be for later passes than the current one).
5698 : * Utility statements that are supposed to happen before the AlterTableCmd
5699 : * are executed immediately. Those that are supposed to happen afterwards
5700 : * are added to the tab->afterStmts list to be done at the very end.
5701 : */
5702 : static AlterTableCmd *
5703 23058 : ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
5704 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
5705 : AlterTablePass cur_pass, AlterTableUtilityContext *context)
5706 : {
5707 23058 : AlterTableCmd *newcmd = NULL;
5708 23058 : AlterTableStmt *atstmt = makeNode(AlterTableStmt);
5709 : List *beforeStmts;
5710 : List *afterStmts;
5711 : ListCell *lc;
5712 :
5713 : /* Gin up an AlterTableStmt with just this subcommand and this table */
5714 23058 : atstmt->relation =
5715 23058 : makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
5716 23058 : pstrdup(RelationGetRelationName(rel)),
5717 : -1);
5718 23058 : atstmt->relation->inh = recurse;
5719 23058 : atstmt->cmds = list_make1(cmd);
5720 23058 : atstmt->objtype = OBJECT_TABLE; /* needn't be picky here */
5721 23058 : atstmt->missing_ok = false;
5722 :
5723 : /* Transform the AlterTableStmt */
5724 23058 : atstmt = transformAlterTableStmt(RelationGetRelid(rel),
5725 : atstmt,
5726 : context->queryString,
5727 : &beforeStmts,
5728 : &afterStmts);
5729 :
5730 : /* Execute any statements that should happen before these subcommand(s) */
5731 23466 : foreach(lc, beforeStmts)
5732 : {
5733 486 : Node *stmt = (Node *) lfirst(lc);
5734 :
5735 486 : ProcessUtilityForAlterTable(stmt, context);
5736 474 : CommandCounterIncrement();
5737 : }
5738 :
5739 : /* Examine the transformed subcommands and schedule them appropriately */
5740 54306 : foreach(lc, atstmt->cmds)
5741 : {
5742 31326 : AlterTableCmd *cmd2 = lfirst_node(AlterTableCmd, lc);
5743 : AlterTablePass pass;
5744 :
5745 : /*
5746 : * This switch need only cover the subcommand types that can be added
5747 : * by parse_utilcmd.c; otherwise, we'll use the default strategy of
5748 : * executing the subcommand immediately, as a substitute for the
5749 : * original subcommand. (Note, however, that this does cause
5750 : * AT_AddConstraint subcommands to be rescheduled into later passes,
5751 : * which is important for index and foreign key constraints.)
5752 : *
5753 : * We assume we needn't do any phase-1 checks for added subcommands.
5754 : */
5755 31326 : switch (cmd2->subtype)
5756 : {
5757 1202 : case AT_AddIndex:
5758 1202 : pass = AT_PASS_ADD_INDEX;
5759 1202 : break;
5760 10640 : case AT_AddIndexConstraint:
5761 10640 : pass = AT_PASS_ADD_INDEXCONSTR;
5762 10640 : break;
5763 12522 : case AT_AddConstraint:
5764 : /* Recursion occurs during execution phase */
5765 12522 : if (recurse)
5766 12474 : cmd2->recurse = true;
5767 12522 : switch (castNode(Constraint, cmd2->def)->contype)
5768 : {
5769 8984 : case CONSTR_NOTNULL:
5770 8984 : pass = AT_PASS_COL_ATTRS;
5771 8984 : break;
5772 0 : case CONSTR_PRIMARY:
5773 : case CONSTR_UNIQUE:
5774 : case CONSTR_EXCLUSION:
5775 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5776 0 : break;
5777 3538 : default:
5778 3538 : pass = AT_PASS_ADD_OTHERCONSTR;
5779 3538 : break;
5780 : }
5781 12522 : break;
5782 0 : case AT_AlterColumnGenericOptions:
5783 : /* This command never recurses */
5784 : /* No command-specific prep needed */
5785 0 : pass = AT_PASS_MISC;
5786 0 : break;
5787 6962 : default:
5788 6962 : pass = cur_pass;
5789 6962 : break;
5790 : }
5791 :
5792 31326 : if (pass < cur_pass)
5793 : {
5794 : /* Cannot schedule into a pass we already finished */
5795 0 : elog(ERROR, "ALTER TABLE scheduling failure: too late for pass %d",
5796 : pass);
5797 : }
5798 31326 : else if (pass > cur_pass)
5799 : {
5800 : /* OK, queue it up for later */
5801 24364 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd2);
5802 : }
5803 : else
5804 : {
5805 : /*
5806 : * We should see at most one subcommand for the current pass,
5807 : * which is the transformed version of the original subcommand.
5808 : */
5809 6962 : if (newcmd == NULL && cmd->subtype == cmd2->subtype)
5810 : {
5811 : /* Found the transformed version of our subcommand */
5812 6962 : newcmd = cmd2;
5813 : }
5814 : else
5815 0 : elog(ERROR, "ALTER TABLE scheduling failure: bogus item for pass %d",
5816 : pass);
5817 : }
5818 : }
5819 :
5820 : /* Queue up any after-statements to happen at the end */
5821 22980 : tab->afterStmts = list_concat(tab->afterStmts, afterStmts);
5822 :
5823 22980 : return newcmd;
5824 : }
5825 :
5826 : /*
5827 : * ATRewriteTables: ALTER TABLE phase 3
5828 : */
5829 : static void
5830 29116 : ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
5831 : AlterTableUtilityContext *context)
5832 : {
5833 : ListCell *ltab;
5834 :
5835 : /* Go through each table that needs to be checked or rewritten */
5836 61928 : foreach(ltab, *wqueue)
5837 : {
5838 33194 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5839 :
5840 : /* Relations without storage may be ignored here */
5841 33194 : if (!RELKIND_HAS_STORAGE(tab->relkind))
5842 5816 : continue;
5843 :
5844 : /*
5845 : * If we change column data types, the operation has to be propagated
5846 : * to tables that use this table's rowtype as a column type.
5847 : * tab->newvals will also be non-NULL in the case where we're adding a
5848 : * column with a default. We choose to forbid that case as well,
5849 : * since composite types might eventually support defaults.
5850 : *
5851 : * (Eventually we'll probably need to check for composite type
5852 : * dependencies even when we're just scanning the table without a
5853 : * rewrite, but at the moment a composite type does not enforce any
5854 : * constraints, so it's not necessary/appropriate to enforce them just
5855 : * during ALTER.)
5856 : */
5857 27378 : if (tab->newvals != NIL || tab->rewrite > 0)
5858 : {
5859 : Relation rel;
5860 :
5861 1748 : rel = table_open(tab->relid, NoLock);
5862 1748 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
5863 1694 : table_close(rel, NoLock);
5864 : }
5865 :
5866 : /*
5867 : * We only need to rewrite the table if at least one column needs to
5868 : * be recomputed, or we are changing its persistence or access method.
5869 : *
5870 : * There are two reasons for requiring a rewrite when changing
5871 : * persistence: on one hand, we need to ensure that the buffers
5872 : * belonging to each of the two relations are marked with or without
5873 : * BM_PERMANENT properly. On the other hand, since rewriting creates
5874 : * and assigns a new relfilenumber, we automatically create or drop an
5875 : * init fork for the relation as appropriate.
5876 : */
5877 27324 : if (tab->rewrite > 0 && tab->relkind != RELKIND_SEQUENCE)
5878 934 : {
5879 : /* Build a temporary relation and copy data */
5880 : Relation OldHeap;
5881 : Oid OIDNewHeap;
5882 : Oid NewAccessMethod;
5883 : Oid NewTableSpace;
5884 : char persistence;
5885 :
5886 990 : OldHeap = table_open(tab->relid, NoLock);
5887 :
5888 : /*
5889 : * We don't support rewriting of system catalogs; there are too
5890 : * many corner cases and too little benefit. In particular this
5891 : * is certainly not going to work for mapped catalogs.
5892 : */
5893 990 : if (IsSystemRelation(OldHeap))
5894 0 : ereport(ERROR,
5895 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5896 : errmsg("cannot rewrite system relation \"%s\"",
5897 : RelationGetRelationName(OldHeap))));
5898 :
5899 990 : if (RelationIsUsedAsCatalogTable(OldHeap))
5900 2 : ereport(ERROR,
5901 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5902 : errmsg("cannot rewrite table \"%s\" used as a catalog table",
5903 : RelationGetRelationName(OldHeap))));
5904 :
5905 : /*
5906 : * Don't allow rewrite on temp tables of other backends ... their
5907 : * local buffer manager is not going to cope. (This is redundant
5908 : * with the check in CheckAlterTableIsSafe, but for safety we'll
5909 : * check here too.)
5910 : */
5911 988 : if (RELATION_IS_OTHER_TEMP(OldHeap))
5912 0 : ereport(ERROR,
5913 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5914 : errmsg("cannot rewrite temporary tables of other sessions")));
5915 :
5916 : /*
5917 : * Select destination tablespace (same as original unless user
5918 : * requested a change)
5919 : */
5920 988 : if (tab->newTableSpace)
5921 0 : NewTableSpace = tab->newTableSpace;
5922 : else
5923 988 : NewTableSpace = OldHeap->rd_rel->reltablespace;
5924 :
5925 : /*
5926 : * Select destination access method (same as original unless user
5927 : * requested a change)
5928 : */
5929 988 : if (tab->chgAccessMethod)
5930 36 : NewAccessMethod = tab->newAccessMethod;
5931 : else
5932 952 : NewAccessMethod = OldHeap->rd_rel->relam;
5933 :
5934 : /*
5935 : * Select persistence of transient table (same as original unless
5936 : * user requested a change)
5937 : */
5938 988 : persistence = tab->chgPersistence ?
5939 936 : tab->newrelpersistence : OldHeap->rd_rel->relpersistence;
5940 :
5941 988 : table_close(OldHeap, NoLock);
5942 :
5943 : /*
5944 : * Fire off an Event Trigger now, before actually rewriting the
5945 : * table.
5946 : *
5947 : * We don't support Event Trigger for nested commands anywhere,
5948 : * here included, and parsetree is given NULL when coming from
5949 : * AlterTableInternal.
5950 : *
5951 : * And fire it only once.
5952 : */
5953 988 : if (parsetree)
5954 988 : EventTriggerTableRewrite((Node *) parsetree,
5955 : tab->relid,
5956 : tab->rewrite);
5957 :
5958 : /*
5959 : * Create transient table that will receive the modified data.
5960 : *
5961 : * Ensure it is marked correctly as logged or unlogged. We have
5962 : * to do this here so that buffers for the new relfilenumber will
5963 : * have the right persistence set, and at the same time ensure
5964 : * that the original filenumbers's buffers will get read in with
5965 : * the correct setting (i.e. the original one). Otherwise a
5966 : * rollback after the rewrite would possibly result with buffers
5967 : * for the original filenumbers having the wrong persistence
5968 : * setting.
5969 : *
5970 : * NB: This relies on swap_relation_files() also swapping the
5971 : * persistence. That wouldn't work for pg_class, but that can't be
5972 : * unlogged anyway.
5973 : */
5974 982 : OIDNewHeap = make_new_heap(tab->relid, NewTableSpace, NewAccessMethod,
5975 : persistence, lockmode);
5976 :
5977 : /*
5978 : * Copy the heap data into the new table with the desired
5979 : * modifications, and test the current data within the table
5980 : * against new constraints generated by ALTER TABLE commands.
5981 : */
5982 982 : ATRewriteTable(tab, OIDNewHeap);
5983 :
5984 : /*
5985 : * Swap the physical files of the old and new heaps, then rebuild
5986 : * indexes and discard the old heap. We can use RecentXmin for
5987 : * the table's new relfrozenxid because we rewrote all the tuples
5988 : * in ATRewriteTable, so no older Xid remains in the table. Also,
5989 : * we never try to swap toast tables by content, since we have no
5990 : * interest in letting this code work on system catalogs.
5991 : */
5992 940 : finish_heap_swap(tab->relid, OIDNewHeap,
5993 : false, false, true,
5994 940 : !OidIsValid(tab->newTableSpace),
5995 : RecentXmin,
5996 : ReadNextMultiXactId(),
5997 : persistence);
5998 :
5999 934 : InvokeObjectPostAlterHook(RelationRelationId, tab->relid, 0);
6000 : }
6001 26334 : else if (tab->rewrite > 0 && tab->relkind == RELKIND_SEQUENCE)
6002 : {
6003 24 : if (tab->chgPersistence)
6004 24 : SequenceChangePersistence(tab->relid, tab->newrelpersistence);
6005 : }
6006 : else
6007 : {
6008 : /*
6009 : * If required, test the current data within the table against new
6010 : * constraints generated by ALTER TABLE commands, but don't
6011 : * rebuild data.
6012 : */
6013 26310 : if (tab->constraints != NIL || tab->verify_new_notnull ||
6014 23426 : tab->partition_constraint != NULL)
6015 4800 : ATRewriteTable(tab, InvalidOid);
6016 :
6017 : /*
6018 : * If we had SET TABLESPACE but no reason to reconstruct tuples,
6019 : * just do a block-by-block copy.
6020 : */
6021 26038 : if (tab->newTableSpace)
6022 122 : ATExecSetTableSpace(tab->relid, tab->newTableSpace, lockmode);
6023 : }
6024 :
6025 : /*
6026 : * Also change persistence of owned sequences, so that it matches the
6027 : * table persistence.
6028 : */
6029 26996 : if (tab->chgPersistence)
6030 : {
6031 76 : List *seqlist = getOwnedSequences(tab->relid);
6032 : ListCell *lc;
6033 :
6034 124 : foreach(lc, seqlist)
6035 : {
6036 48 : Oid seq_relid = lfirst_oid(lc);
6037 :
6038 48 : SequenceChangePersistence(seq_relid, tab->newrelpersistence);
6039 : }
6040 : }
6041 : }
6042 :
6043 : /*
6044 : * Foreign key constraints are checked in a final pass, since (a) it's
6045 : * generally best to examine each one separately, and (b) it's at least
6046 : * theoretically possible that we have changed both relations of the
6047 : * foreign key, and we'd better have finished both rewrites before we try
6048 : * to read the tables.
6049 : */
6050 61288 : foreach(ltab, *wqueue)
6051 : {
6052 32646 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6053 32646 : Relation rel = NULL;
6054 : ListCell *lcon;
6055 :
6056 : /* Relations without storage may be ignored here too */
6057 32646 : if (!RELKIND_HAS_STORAGE(tab->relkind))
6058 5712 : continue;
6059 :
6060 28738 : foreach(lcon, tab->constraints)
6061 : {
6062 1896 : NewConstraint *con = lfirst(lcon);
6063 :
6064 1896 : if (con->contype == CONSTR_FOREIGN)
6065 : {
6066 1166 : Constraint *fkconstraint = (Constraint *) con->qual;
6067 : Relation refrel;
6068 :
6069 1166 : if (rel == NULL)
6070 : {
6071 : /* Long since locked, no need for another */
6072 1154 : rel = table_open(tab->relid, NoLock);
6073 : }
6074 :
6075 1166 : refrel = table_open(con->refrelid, RowShareLock);
6076 :
6077 1166 : validateForeignKeyConstraint(fkconstraint->conname, rel, refrel,
6078 : con->refindid,
6079 : con->conid,
6080 1166 : con->conwithperiod);
6081 :
6082 : /*
6083 : * No need to mark the constraint row as validated, we did
6084 : * that when we inserted the row earlier.
6085 : */
6086 :
6087 1074 : table_close(refrel, NoLock);
6088 : }
6089 : }
6090 :
6091 26842 : if (rel)
6092 1062 : table_close(rel, NoLock);
6093 : }
6094 :
6095 : /* Finally, run any afterStmts that were queued up */
6096 61152 : foreach(ltab, *wqueue)
6097 : {
6098 32510 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6099 : ListCell *lc;
6100 :
6101 32596 : foreach(lc, tab->afterStmts)
6102 : {
6103 86 : Node *stmt = (Node *) lfirst(lc);
6104 :
6105 86 : ProcessUtilityForAlterTable(stmt, context);
6106 86 : CommandCounterIncrement();
6107 : }
6108 : }
6109 28642 : }
6110 :
6111 : /*
6112 : * ATRewriteTable: scan or rewrite one table
6113 : *
6114 : * A rewrite is requested by passing a valid OIDNewHeap; in that case, caller
6115 : * must already hold AccessExclusiveLock on it.
6116 : */
6117 : static void
6118 5782 : ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
6119 : {
6120 : Relation oldrel;
6121 : Relation newrel;
6122 : TupleDesc oldTupDesc;
6123 : TupleDesc newTupDesc;
6124 5782 : bool needscan = false;
6125 : List *notnull_attrs;
6126 : List *notnull_virtual_attrs;
6127 : int i;
6128 : ListCell *l;
6129 : EState *estate;
6130 : CommandId mycid;
6131 : BulkInsertState bistate;
6132 : int ti_options;
6133 5782 : ExprState *partqualstate = NULL;
6134 :
6135 : /*
6136 : * Open the relation(s). We have surely already locked the existing
6137 : * table.
6138 : */
6139 5782 : oldrel = table_open(tab->relid, NoLock);
6140 5782 : oldTupDesc = tab->oldDesc;
6141 5782 : newTupDesc = RelationGetDescr(oldrel); /* includes all mods */
6142 :
6143 5782 : if (OidIsValid(OIDNewHeap))
6144 : {
6145 : Assert(CheckRelationOidLockedByMe(OIDNewHeap, AccessExclusiveLock,
6146 : false));
6147 982 : newrel = table_open(OIDNewHeap, NoLock);
6148 : }
6149 : else
6150 4800 : newrel = NULL;
6151 :
6152 : /*
6153 : * Prepare a BulkInsertState and options for table_tuple_insert. The FSM
6154 : * is empty, so don't bother using it.
6155 : */
6156 5782 : if (newrel)
6157 : {
6158 982 : mycid = GetCurrentCommandId(true);
6159 982 : bistate = GetBulkInsertState();
6160 982 : ti_options = TABLE_INSERT_SKIP_FSM;
6161 : }
6162 : else
6163 : {
6164 : /* keep compiler quiet about using these uninitialized */
6165 4800 : mycid = 0;
6166 4800 : bistate = NULL;
6167 4800 : ti_options = 0;
6168 : }
6169 :
6170 : /*
6171 : * Generate the constraint and default execution states
6172 : */
6173 :
6174 5782 : estate = CreateExecutorState();
6175 :
6176 : /* Build the needed expression execution states */
6177 7798 : foreach(l, tab->constraints)
6178 : {
6179 2016 : NewConstraint *con = lfirst(l);
6180 :
6181 2016 : switch (con->contype)
6182 : {
6183 844 : case CONSTR_CHECK:
6184 844 : needscan = true;
6185 844 : con->qualstate = ExecPrepareExpr((Expr *) expand_generated_columns_in_expr(con->qual, oldrel, 1), estate);
6186 844 : break;
6187 1172 : case CONSTR_FOREIGN:
6188 : /* Nothing to do here */
6189 1172 : break;
6190 0 : default:
6191 0 : elog(ERROR, "unrecognized constraint type: %d",
6192 : (int) con->contype);
6193 : }
6194 : }
6195 :
6196 : /* Build expression execution states for partition check quals */
6197 5782 : if (tab->partition_constraint)
6198 : {
6199 2064 : needscan = true;
6200 2064 : partqualstate = ExecPrepareExpr(tab->partition_constraint, estate);
6201 : }
6202 :
6203 6826 : foreach(l, tab->newvals)
6204 : {
6205 1044 : NewColumnValue *ex = lfirst(l);
6206 :
6207 : /* expr already planned */
6208 1044 : ex->exprstate = ExecInitExpr((Expr *) ex->expr, NULL);
6209 : }
6210 :
6211 5782 : notnull_attrs = notnull_virtual_attrs = NIL;
6212 5782 : if (newrel || tab->verify_new_notnull)
6213 : {
6214 : /*
6215 : * If we are rebuilding the tuples OR if we added any new but not
6216 : * verified not-null constraints, check all *valid* not-null
6217 : * constraints. This is a bit of overkill but it minimizes risk of
6218 : * bugs.
6219 : *
6220 : * notnull_attrs does *not* collect attribute numbers for valid
6221 : * not-null constraints over virtual generated columns; instead, they
6222 : * are collected in notnull_virtual_attrs for verification elsewhere.
6223 : */
6224 7514 : for (i = 0; i < newTupDesc->natts; i++)
6225 : {
6226 5494 : CompactAttribute *attr = TupleDescCompactAttr(newTupDesc, i);
6227 :
6228 5494 : if (attr->attnullability == ATTNULLABLE_VALID &&
6229 2118 : !attr->attisdropped)
6230 : {
6231 2118 : Form_pg_attribute wholeatt = TupleDescAttr(newTupDesc, i);
6232 :
6233 2118 : if (wholeatt->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
6234 2028 : notnull_attrs = lappend_int(notnull_attrs, wholeatt->attnum);
6235 : else
6236 90 : notnull_virtual_attrs = lappend_int(notnull_virtual_attrs,
6237 90 : wholeatt->attnum);
6238 : }
6239 : }
6240 2020 : if (notnull_attrs || notnull_virtual_attrs)
6241 1556 : needscan = true;
6242 : }
6243 :
6244 5782 : if (newrel || needscan)
6245 : {
6246 : ExprContext *econtext;
6247 : TupleTableSlot *oldslot;
6248 : TupleTableSlot *newslot;
6249 : TableScanDesc scan;
6250 : MemoryContext oldCxt;
6251 4812 : List *dropped_attrs = NIL;
6252 : ListCell *lc;
6253 : Snapshot snapshot;
6254 4812 : ResultRelInfo *rInfo = NULL;
6255 :
6256 : /*
6257 : * When adding or changing a virtual generated column with a not-null
6258 : * constraint, we need to evaluate whether the generation expression
6259 : * is null. For that, we borrow ExecRelGenVirtualNotNull(). Here, we
6260 : * prepare a dummy ResultRelInfo.
6261 : */
6262 4812 : if (notnull_virtual_attrs != NIL)
6263 : {
6264 : MemoryContext oldcontext;
6265 :
6266 : Assert(newTupDesc->constr->has_generated_virtual);
6267 : Assert(newTupDesc->constr->has_not_null);
6268 60 : oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
6269 60 : rInfo = makeNode(ResultRelInfo);
6270 60 : InitResultRelInfo(rInfo,
6271 : oldrel,
6272 : 0, /* dummy rangetable index */
6273 : NULL,
6274 : estate->es_instrument);
6275 60 : MemoryContextSwitchTo(oldcontext);
6276 : }
6277 :
6278 4812 : if (newrel)
6279 982 : ereport(DEBUG1,
6280 : (errmsg_internal("rewriting table \"%s\"",
6281 : RelationGetRelationName(oldrel))));
6282 : else
6283 3830 : ereport(DEBUG1,
6284 : (errmsg_internal("verifying table \"%s\"",
6285 : RelationGetRelationName(oldrel))));
6286 :
6287 4812 : if (newrel)
6288 : {
6289 : /*
6290 : * All predicate locks on the tuples or pages are about to be made
6291 : * invalid, because we move tuples around. Promote them to
6292 : * relation locks.
6293 : */
6294 982 : TransferPredicateLocksToHeapRelation(oldrel);
6295 : }
6296 :
6297 4812 : econtext = GetPerTupleExprContext(estate);
6298 :
6299 : /*
6300 : * Create necessary tuple slots. When rewriting, two slots are needed,
6301 : * otherwise one suffices. In the case where one slot suffices, we
6302 : * need to use the new tuple descriptor, otherwise some constraints
6303 : * can't be evaluated. Note that even when the tuple layout is the
6304 : * same and no rewrite is required, the tupDescs might not be
6305 : * (consider ADD COLUMN without a default).
6306 : */
6307 4812 : if (tab->rewrite)
6308 : {
6309 : Assert(newrel != NULL);
6310 982 : oldslot = MakeSingleTupleTableSlot(oldTupDesc,
6311 : table_slot_callbacks(oldrel));
6312 982 : newslot = MakeSingleTupleTableSlot(newTupDesc,
6313 : table_slot_callbacks(newrel));
6314 :
6315 : /*
6316 : * Set all columns in the new slot to NULL initially, to ensure
6317 : * columns added as part of the rewrite are initialized to NULL.
6318 : * That is necessary as tab->newvals will not contain an
6319 : * expression for columns with a NULL default, e.g. when adding a
6320 : * column without a default together with a column with a default
6321 : * requiring an actual rewrite.
6322 : */
6323 982 : ExecStoreAllNullTuple(newslot);
6324 : }
6325 : else
6326 : {
6327 3830 : oldslot = MakeSingleTupleTableSlot(newTupDesc,
6328 : table_slot_callbacks(oldrel));
6329 3830 : newslot = NULL;
6330 : }
6331 :
6332 : /*
6333 : * Any attributes that are dropped according to the new tuple
6334 : * descriptor can be set to NULL. We precompute the list of dropped
6335 : * attributes to avoid needing to do so in the per-tuple loop.
6336 : */
6337 17000 : for (i = 0; i < newTupDesc->natts; i++)
6338 : {
6339 12188 : if (TupleDescAttr(newTupDesc, i)->attisdropped)
6340 790 : dropped_attrs = lappend_int(dropped_attrs, i);
6341 : }
6342 :
6343 : /*
6344 : * Scan through the rows, generating a new row if needed and then
6345 : * checking all the constraints.
6346 : */
6347 4812 : snapshot = RegisterSnapshot(GetLatestSnapshot());
6348 4812 : scan = table_beginscan(oldrel, snapshot, 0, NULL);
6349 :
6350 : /*
6351 : * Switch to per-tuple memory context and reset it for each tuple
6352 : * produced, so we don't leak memory.
6353 : */
6354 4812 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
6355 :
6356 774538 : while (table_scan_getnextslot(scan, ForwardScanDirection, oldslot))
6357 : {
6358 : TupleTableSlot *insertslot;
6359 :
6360 765228 : if (tab->rewrite > 0)
6361 : {
6362 : /* Extract data from old tuple */
6363 99834 : slot_getallattrs(oldslot);
6364 99834 : ExecClearTuple(newslot);
6365 :
6366 : /* copy attributes */
6367 99834 : memcpy(newslot->tts_values, oldslot->tts_values,
6368 99834 : sizeof(Datum) * oldslot->tts_nvalid);
6369 99834 : memcpy(newslot->tts_isnull, oldslot->tts_isnull,
6370 99834 : sizeof(bool) * oldslot->tts_nvalid);
6371 :
6372 : /* Set dropped attributes to null in new tuple */
6373 99950 : foreach(lc, dropped_attrs)
6374 116 : newslot->tts_isnull[lfirst_int(lc)] = true;
6375 :
6376 : /*
6377 : * Constraints and GENERATED expressions might reference the
6378 : * tableoid column, so fill tts_tableOid with the desired
6379 : * value. (We must do this each time, because it gets
6380 : * overwritten with newrel's OID during storing.)
6381 : */
6382 99834 : newslot->tts_tableOid = RelationGetRelid(oldrel);
6383 :
6384 : /*
6385 : * Process supplied expressions to replace selected columns.
6386 : *
6387 : * First, evaluate expressions whose inputs come from the old
6388 : * tuple.
6389 : */
6390 99834 : econtext->ecxt_scantuple = oldslot;
6391 :
6392 205620 : foreach(l, tab->newvals)
6393 : {
6394 105798 : NewColumnValue *ex = lfirst(l);
6395 :
6396 105798 : if (ex->is_generated)
6397 312 : continue;
6398 :
6399 105486 : newslot->tts_values[ex->attnum - 1]
6400 105474 : = ExecEvalExpr(ex->exprstate,
6401 : econtext,
6402 105486 : &newslot->tts_isnull[ex->attnum - 1]);
6403 : }
6404 :
6405 99822 : ExecStoreVirtualTuple(newslot);
6406 :
6407 : /*
6408 : * Now, evaluate any expressions whose inputs come from the
6409 : * new tuple. We assume these columns won't reference each
6410 : * other, so that there's no ordering dependency.
6411 : */
6412 99822 : econtext->ecxt_scantuple = newslot;
6413 :
6414 205608 : foreach(l, tab->newvals)
6415 : {
6416 105786 : NewColumnValue *ex = lfirst(l);
6417 :
6418 105786 : if (!ex->is_generated)
6419 105474 : continue;
6420 :
6421 312 : newslot->tts_values[ex->attnum - 1]
6422 312 : = ExecEvalExpr(ex->exprstate,
6423 : econtext,
6424 312 : &newslot->tts_isnull[ex->attnum - 1]);
6425 : }
6426 :
6427 99822 : insertslot = newslot;
6428 : }
6429 : else
6430 : {
6431 : /*
6432 : * If there's no rewrite, old and new table are guaranteed to
6433 : * have the same AM, so we can just use the old slot to verify
6434 : * new constraints etc.
6435 : */
6436 665394 : insertslot = oldslot;
6437 : }
6438 :
6439 : /* Now check any constraints on the possibly-changed tuple */
6440 765216 : econtext->ecxt_scantuple = insertslot;
6441 :
6442 4106702 : foreach_int(attn, notnull_attrs)
6443 : {
6444 2576474 : if (slot_attisnull(insertslot, attn))
6445 : {
6446 102 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attn - 1);
6447 :
6448 102 : ereport(ERROR,
6449 : (errcode(ERRCODE_NOT_NULL_VIOLATION),
6450 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6451 : NameStr(attr->attname),
6452 : RelationGetRelationName(oldrel)),
6453 : errtablecol(oldrel, attn)));
6454 : }
6455 : }
6456 :
6457 765114 : if (notnull_virtual_attrs != NIL)
6458 : {
6459 : AttrNumber attnum;
6460 :
6461 84 : attnum = ExecRelGenVirtualNotNull(rInfo, insertslot,
6462 : estate,
6463 : notnull_virtual_attrs);
6464 84 : if (attnum != InvalidAttrNumber)
6465 : {
6466 30 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attnum - 1);
6467 :
6468 30 : ereport(ERROR,
6469 : errcode(ERRCODE_NOT_NULL_VIOLATION),
6470 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6471 : NameStr(attr->attname),
6472 : RelationGetRelationName(oldrel)),
6473 : errtablecol(oldrel, attnum));
6474 : }
6475 : }
6476 :
6477 773244 : foreach(l, tab->constraints)
6478 : {
6479 8256 : NewConstraint *con = lfirst(l);
6480 :
6481 8256 : switch (con->contype)
6482 : {
6483 8150 : case CONSTR_CHECK:
6484 8150 : if (!ExecCheck(con->qualstate, econtext))
6485 96 : ereport(ERROR,
6486 : (errcode(ERRCODE_CHECK_VIOLATION),
6487 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
6488 : con->name,
6489 : RelationGetRelationName(oldrel)),
6490 : errtableconstraint(oldrel, con->name)));
6491 8054 : break;
6492 106 : case CONSTR_NOTNULL:
6493 : case CONSTR_FOREIGN:
6494 : /* Nothing to do here */
6495 106 : break;
6496 0 : default:
6497 0 : elog(ERROR, "unrecognized constraint type: %d",
6498 : (int) con->contype);
6499 : }
6500 : }
6501 :
6502 764988 : if (partqualstate && !ExecCheck(partqualstate, econtext))
6503 : {
6504 74 : if (tab->validate_default)
6505 26 : ereport(ERROR,
6506 : (errcode(ERRCODE_CHECK_VIOLATION),
6507 : errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
6508 : RelationGetRelationName(oldrel)),
6509 : errtable(oldrel)));
6510 : else
6511 48 : ereport(ERROR,
6512 : (errcode(ERRCODE_CHECK_VIOLATION),
6513 : errmsg("partition constraint of relation \"%s\" is violated by some row",
6514 : RelationGetRelationName(oldrel)),
6515 : errtable(oldrel)));
6516 : }
6517 :
6518 : /* Write the tuple out to the new relation */
6519 764914 : if (newrel)
6520 99792 : table_tuple_insert(newrel, insertslot, mycid,
6521 : ti_options, bistate);
6522 :
6523 764914 : ResetExprContext(econtext);
6524 :
6525 764914 : CHECK_FOR_INTERRUPTS();
6526 : }
6527 :
6528 4498 : MemoryContextSwitchTo(oldCxt);
6529 4498 : table_endscan(scan);
6530 4498 : UnregisterSnapshot(snapshot);
6531 :
6532 4498 : ExecDropSingleTupleTableSlot(oldslot);
6533 4498 : if (newslot)
6534 940 : ExecDropSingleTupleTableSlot(newslot);
6535 : }
6536 :
6537 5468 : FreeExecutorState(estate);
6538 :
6539 5468 : table_close(oldrel, NoLock);
6540 5468 : if (newrel)
6541 : {
6542 940 : FreeBulkInsertState(bistate);
6543 :
6544 940 : table_finish_bulk_insert(newrel, ti_options);
6545 :
6546 940 : table_close(newrel, NoLock);
6547 : }
6548 5468 : }
6549 :
6550 : /*
6551 : * ATGetQueueEntry: find or create an entry in the ALTER TABLE work queue
6552 : */
6553 : static AlteredTableInfo *
6554 41510 : ATGetQueueEntry(List **wqueue, Relation rel)
6555 : {
6556 41510 : Oid relid = RelationGetRelid(rel);
6557 : AlteredTableInfo *tab;
6558 : ListCell *ltab;
6559 :
6560 51104 : foreach(ltab, *wqueue)
6561 : {
6562 14472 : tab = (AlteredTableInfo *) lfirst(ltab);
6563 14472 : if (tab->relid == relid)
6564 4878 : return tab;
6565 : }
6566 :
6567 : /*
6568 : * Not there, so add it. Note that we make a copy of the relation's
6569 : * existing descriptor before anything interesting can happen to it.
6570 : */
6571 36632 : tab = (AlteredTableInfo *) palloc0(sizeof(AlteredTableInfo));
6572 36632 : tab->relid = relid;
6573 36632 : tab->rel = NULL; /* set later */
6574 36632 : tab->relkind = rel->rd_rel->relkind;
6575 36632 : tab->oldDesc = CreateTupleDescCopyConstr(RelationGetDescr(rel));
6576 36632 : tab->newAccessMethod = InvalidOid;
6577 36632 : tab->chgAccessMethod = false;
6578 36632 : tab->newTableSpace = InvalidOid;
6579 36632 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
6580 36632 : tab->chgPersistence = false;
6581 :
6582 36632 : *wqueue = lappend(*wqueue, tab);
6583 :
6584 36632 : return tab;
6585 : }
6586 :
6587 : static const char *
6588 80 : alter_table_type_to_string(AlterTableType cmdtype)
6589 : {
6590 80 : switch (cmdtype)
6591 : {
6592 0 : case AT_AddColumn:
6593 : case AT_AddColumnToView:
6594 0 : return "ADD COLUMN";
6595 0 : case AT_ColumnDefault:
6596 : case AT_CookedColumnDefault:
6597 0 : return "ALTER COLUMN ... SET DEFAULT";
6598 6 : case AT_DropNotNull:
6599 6 : return "ALTER COLUMN ... DROP NOT NULL";
6600 6 : case AT_SetNotNull:
6601 6 : return "ALTER COLUMN ... SET NOT NULL";
6602 0 : case AT_SetExpression:
6603 0 : return "ALTER COLUMN ... SET EXPRESSION";
6604 0 : case AT_DropExpression:
6605 0 : return "ALTER COLUMN ... DROP EXPRESSION";
6606 0 : case AT_SetStatistics:
6607 0 : return "ALTER COLUMN ... SET STATISTICS";
6608 12 : case AT_SetOptions:
6609 12 : return "ALTER COLUMN ... SET";
6610 0 : case AT_ResetOptions:
6611 0 : return "ALTER COLUMN ... RESET";
6612 0 : case AT_SetStorage:
6613 0 : return "ALTER COLUMN ... SET STORAGE";
6614 0 : case AT_SetCompression:
6615 0 : return "ALTER COLUMN ... SET COMPRESSION";
6616 6 : case AT_DropColumn:
6617 6 : return "DROP COLUMN";
6618 0 : case AT_AddIndex:
6619 : case AT_ReAddIndex:
6620 0 : return NULL; /* not real grammar */
6621 0 : case AT_AddConstraint:
6622 : case AT_ReAddConstraint:
6623 : case AT_ReAddDomainConstraint:
6624 : case AT_AddIndexConstraint:
6625 0 : return "ADD CONSTRAINT";
6626 6 : case AT_AlterConstraint:
6627 6 : return "ALTER CONSTRAINT";
6628 0 : case AT_ValidateConstraint:
6629 0 : return "VALIDATE CONSTRAINT";
6630 0 : case AT_DropConstraint:
6631 0 : return "DROP CONSTRAINT";
6632 0 : case AT_ReAddComment:
6633 0 : return NULL; /* not real grammar */
6634 0 : case AT_AlterColumnType:
6635 0 : return "ALTER COLUMN ... SET DATA TYPE";
6636 0 : case AT_AlterColumnGenericOptions:
6637 0 : return "ALTER COLUMN ... OPTIONS";
6638 0 : case AT_ChangeOwner:
6639 0 : return "OWNER TO";
6640 0 : case AT_ClusterOn:
6641 0 : return "CLUSTER ON";
6642 0 : case AT_DropCluster:
6643 0 : return "SET WITHOUT CLUSTER";
6644 0 : case AT_SetAccessMethod:
6645 0 : return "SET ACCESS METHOD";
6646 6 : case AT_SetLogged:
6647 6 : return "SET LOGGED";
6648 6 : case AT_SetUnLogged:
6649 6 : return "SET UNLOGGED";
6650 0 : case AT_DropOids:
6651 0 : return "SET WITHOUT OIDS";
6652 0 : case AT_SetTableSpace:
6653 0 : return "SET TABLESPACE";
6654 2 : case AT_SetRelOptions:
6655 2 : return "SET";
6656 0 : case AT_ResetRelOptions:
6657 0 : return "RESET";
6658 0 : case AT_ReplaceRelOptions:
6659 0 : return NULL; /* not real grammar */
6660 0 : case AT_EnableTrig:
6661 0 : return "ENABLE TRIGGER";
6662 0 : case AT_EnableAlwaysTrig:
6663 0 : return "ENABLE ALWAYS TRIGGER";
6664 0 : case AT_EnableReplicaTrig:
6665 0 : return "ENABLE REPLICA TRIGGER";
6666 0 : case AT_DisableTrig:
6667 0 : return "DISABLE TRIGGER";
6668 0 : case AT_EnableTrigAll:
6669 0 : return "ENABLE TRIGGER ALL";
6670 0 : case AT_DisableTrigAll:
6671 0 : return "DISABLE TRIGGER ALL";
6672 0 : case AT_EnableTrigUser:
6673 0 : return "ENABLE TRIGGER USER";
6674 0 : case AT_DisableTrigUser:
6675 0 : return "DISABLE TRIGGER USER";
6676 0 : case AT_EnableRule:
6677 0 : return "ENABLE RULE";
6678 0 : case AT_EnableAlwaysRule:
6679 0 : return "ENABLE ALWAYS RULE";
6680 0 : case AT_EnableReplicaRule:
6681 0 : return "ENABLE REPLICA RULE";
6682 0 : case AT_DisableRule:
6683 0 : return "DISABLE RULE";
6684 0 : case AT_AddInherit:
6685 0 : return "INHERIT";
6686 0 : case AT_DropInherit:
6687 0 : return "NO INHERIT";
6688 0 : case AT_AddOf:
6689 0 : return "OF";
6690 0 : case AT_DropOf:
6691 0 : return "NOT OF";
6692 0 : case AT_ReplicaIdentity:
6693 0 : return "REPLICA IDENTITY";
6694 0 : case AT_EnableRowSecurity:
6695 0 : return "ENABLE ROW SECURITY";
6696 0 : case AT_DisableRowSecurity:
6697 0 : return "DISABLE ROW SECURITY";
6698 0 : case AT_ForceRowSecurity:
6699 0 : return "FORCE ROW SECURITY";
6700 0 : case AT_NoForceRowSecurity:
6701 0 : return "NO FORCE ROW SECURITY";
6702 0 : case AT_GenericOptions:
6703 0 : return "OPTIONS";
6704 6 : case AT_AttachPartition:
6705 6 : return "ATTACH PARTITION";
6706 18 : case AT_DetachPartition:
6707 18 : return "DETACH PARTITION";
6708 6 : case AT_DetachPartitionFinalize:
6709 6 : return "DETACH PARTITION ... FINALIZE";
6710 0 : case AT_AddIdentity:
6711 0 : return "ALTER COLUMN ... ADD IDENTITY";
6712 0 : case AT_SetIdentity:
6713 0 : return "ALTER COLUMN ... SET";
6714 0 : case AT_DropIdentity:
6715 0 : return "ALTER COLUMN ... DROP IDENTITY";
6716 0 : case AT_ReAddStatistics:
6717 0 : return NULL; /* not real grammar */
6718 : }
6719 :
6720 0 : return NULL;
6721 : }
6722 :
6723 : /*
6724 : * ATSimplePermissions
6725 : *
6726 : * - Ensure that it is a relation (or possibly a view)
6727 : * - Ensure this user is the owner
6728 : * - Ensure that it is not a system table
6729 : */
6730 : static void
6731 37916 : ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets)
6732 : {
6733 : int actual_target;
6734 :
6735 37916 : switch (rel->rd_rel->relkind)
6736 : {
6737 29992 : case RELKIND_RELATION:
6738 29992 : actual_target = ATT_TABLE;
6739 29992 : break;
6740 5652 : case RELKIND_PARTITIONED_TABLE:
6741 5652 : actual_target = ATT_PARTITIONED_TABLE;
6742 5652 : break;
6743 402 : case RELKIND_VIEW:
6744 402 : actual_target = ATT_VIEW;
6745 402 : break;
6746 46 : case RELKIND_MATVIEW:
6747 46 : actual_target = ATT_MATVIEW;
6748 46 : break;
6749 228 : case RELKIND_INDEX:
6750 228 : actual_target = ATT_INDEX;
6751 228 : break;
6752 422 : case RELKIND_PARTITIONED_INDEX:
6753 422 : actual_target = ATT_PARTITIONED_INDEX;
6754 422 : break;
6755 216 : case RELKIND_COMPOSITE_TYPE:
6756 216 : actual_target = ATT_COMPOSITE_TYPE;
6757 216 : break;
6758 932 : case RELKIND_FOREIGN_TABLE:
6759 932 : actual_target = ATT_FOREIGN_TABLE;
6760 932 : break;
6761 24 : case RELKIND_SEQUENCE:
6762 24 : actual_target = ATT_SEQUENCE;
6763 24 : break;
6764 2 : default:
6765 2 : actual_target = 0;
6766 2 : break;
6767 : }
6768 :
6769 : /* Wrong target type? */
6770 37916 : if ((actual_target & allowed_targets) == 0)
6771 : {
6772 80 : const char *action_str = alter_table_type_to_string(cmdtype);
6773 :
6774 80 : if (action_str)
6775 80 : ereport(ERROR,
6776 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
6777 : /* translator: %s is a group of some SQL keywords */
6778 : errmsg("ALTER action %s cannot be performed on relation \"%s\"",
6779 : action_str, RelationGetRelationName(rel)),
6780 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
6781 : else
6782 : /* internal error? */
6783 0 : elog(ERROR, "invalid ALTER action attempted on relation \"%s\"",
6784 : RelationGetRelationName(rel));
6785 : }
6786 :
6787 : /* Permissions checks */
6788 37836 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(rel), GetUserId()))
6789 12 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
6790 12 : RelationGetRelationName(rel));
6791 :
6792 37824 : if (!allowSystemTableMods && IsSystemRelation(rel))
6793 0 : ereport(ERROR,
6794 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6795 : errmsg("permission denied: \"%s\" is a system catalog",
6796 : RelationGetRelationName(rel))));
6797 37824 : }
6798 :
6799 : /*
6800 : * ATSimpleRecursion
6801 : *
6802 : * Simple table recursion sufficient for most ALTER TABLE operations.
6803 : * All direct and indirect children are processed in an unspecified order.
6804 : * Note that if a child inherits from the original table via multiple
6805 : * inheritance paths, it will be visited just once.
6806 : */
6807 : static void
6808 1346 : ATSimpleRecursion(List **wqueue, Relation rel,
6809 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
6810 : AlterTableUtilityContext *context)
6811 : {
6812 : /*
6813 : * Propagate to children, if desired and if there are (or might be) any
6814 : * children.
6815 : */
6816 1346 : if (recurse && rel->rd_rel->relhassubclass)
6817 : {
6818 84 : Oid relid = RelationGetRelid(rel);
6819 : ListCell *child;
6820 : List *children;
6821 :
6822 84 : children = find_all_inheritors(relid, lockmode, NULL);
6823 :
6824 : /*
6825 : * find_all_inheritors does the recursive search of the inheritance
6826 : * hierarchy, so all we have to do is process all of the relids in the
6827 : * list that it returns.
6828 : */
6829 366 : foreach(child, children)
6830 : {
6831 282 : Oid childrelid = lfirst_oid(child);
6832 : Relation childrel;
6833 :
6834 282 : if (childrelid == relid)
6835 84 : continue;
6836 : /* find_all_inheritors already got lock */
6837 198 : childrel = relation_open(childrelid, NoLock);
6838 198 : CheckAlterTableIsSafe(childrel);
6839 198 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
6840 198 : relation_close(childrel, NoLock);
6841 : }
6842 : }
6843 1346 : }
6844 :
6845 : /*
6846 : * Obtain list of partitions of the given table, locking them all at the given
6847 : * lockmode and ensuring that they all pass CheckAlterTableIsSafe.
6848 : *
6849 : * This function is a no-op if the given relation is not a partitioned table;
6850 : * in particular, nothing is done if it's a legacy inheritance parent.
6851 : */
6852 : static void
6853 818 : ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode)
6854 : {
6855 818 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6856 : {
6857 : List *inh;
6858 : ListCell *cell;
6859 :
6860 176 : inh = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
6861 : /* first element is the parent rel; must ignore it */
6862 574 : for_each_from(cell, inh, 1)
6863 : {
6864 : Relation childrel;
6865 :
6866 : /* find_all_inheritors already got lock */
6867 404 : childrel = table_open(lfirst_oid(cell), NoLock);
6868 404 : CheckAlterTableIsSafe(childrel);
6869 398 : table_close(childrel, NoLock);
6870 : }
6871 170 : list_free(inh);
6872 : }
6873 812 : }
6874 :
6875 : /*
6876 : * ATTypedTableRecursion
6877 : *
6878 : * Propagate ALTER TYPE operations to the typed tables of that type.
6879 : * Also check the RESTRICT/CASCADE behavior. Given CASCADE, also permit
6880 : * recursion to inheritance children of the typed tables.
6881 : */
6882 : static void
6883 192 : ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
6884 : LOCKMODE lockmode, AlterTableUtilityContext *context)
6885 : {
6886 : ListCell *child;
6887 : List *children;
6888 :
6889 : Assert(rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
6890 :
6891 192 : children = find_typed_table_dependencies(rel->rd_rel->reltype,
6892 192 : RelationGetRelationName(rel),
6893 : cmd->behavior);
6894 :
6895 204 : foreach(child, children)
6896 : {
6897 30 : Oid childrelid = lfirst_oid(child);
6898 : Relation childrel;
6899 :
6900 30 : childrel = relation_open(childrelid, lockmode);
6901 30 : CheckAlterTableIsSafe(childrel);
6902 30 : ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode, context);
6903 30 : relation_close(childrel, NoLock);
6904 : }
6905 174 : }
6906 :
6907 :
6908 : /*
6909 : * find_composite_type_dependencies
6910 : *
6911 : * Check to see if the type "typeOid" is being used as a column in some table
6912 : * (possibly nested several levels deep in composite types, arrays, etc!).
6913 : * Eventually, we'd like to propagate the check or rewrite operation
6914 : * into such tables, but for now, just error out if we find any.
6915 : *
6916 : * Caller should provide either the associated relation of a rowtype,
6917 : * or a type name (not both) for use in the error message, if any.
6918 : *
6919 : * Note that "typeOid" is not necessarily a composite type; it could also be
6920 : * another container type such as an array or range, or a domain over one of
6921 : * these things. The name of this function is therefore somewhat historical,
6922 : * but it's not worth changing.
6923 : *
6924 : * We assume that functions and views depending on the type are not reasons
6925 : * to reject the ALTER. (How safe is this really?)
6926 : */
6927 : void
6928 4550 : find_composite_type_dependencies(Oid typeOid, Relation origRelation,
6929 : const char *origTypeName)
6930 : {
6931 : Relation depRel;
6932 : ScanKeyData key[2];
6933 : SysScanDesc depScan;
6934 : HeapTuple depTup;
6935 :
6936 : /* since this function recurses, it could be driven to stack overflow */
6937 4550 : check_stack_depth();
6938 :
6939 : /*
6940 : * We scan pg_depend to find those things that depend on the given type.
6941 : * (We assume we can ignore refobjsubid for a type.)
6942 : */
6943 4550 : depRel = table_open(DependRelationId, AccessShareLock);
6944 :
6945 4550 : ScanKeyInit(&key[0],
6946 : Anum_pg_depend_refclassid,
6947 : BTEqualStrategyNumber, F_OIDEQ,
6948 : ObjectIdGetDatum(TypeRelationId));
6949 4550 : ScanKeyInit(&key[1],
6950 : Anum_pg_depend_refobjid,
6951 : BTEqualStrategyNumber, F_OIDEQ,
6952 : ObjectIdGetDatum(typeOid));
6953 :
6954 4550 : depScan = systable_beginscan(depRel, DependReferenceIndexId, true,
6955 : NULL, 2, key);
6956 :
6957 6992 : while (HeapTupleIsValid(depTup = systable_getnext(depScan)))
6958 : {
6959 2598 : Form_pg_depend pg_depend = (Form_pg_depend) GETSTRUCT(depTup);
6960 : Relation rel;
6961 : TupleDesc tupleDesc;
6962 : Form_pg_attribute att;
6963 :
6964 : /* Check for directly dependent types */
6965 2598 : if (pg_depend->classid == TypeRelationId)
6966 : {
6967 : /*
6968 : * This must be an array, domain, or range containing the given
6969 : * type, so recursively check for uses of this type. Note that
6970 : * any error message will mention the original type not the
6971 : * container; this is intentional.
6972 : */
6973 2192 : find_composite_type_dependencies(pg_depend->objid,
6974 : origRelation, origTypeName);
6975 2168 : continue;
6976 : }
6977 :
6978 : /* Else, ignore dependees that aren't relations */
6979 406 : if (pg_depend->classid != RelationRelationId)
6980 122 : continue;
6981 :
6982 284 : rel = relation_open(pg_depend->objid, AccessShareLock);
6983 284 : tupleDesc = RelationGetDescr(rel);
6984 :
6985 : /*
6986 : * If objsubid identifies a specific column, refer to that in error
6987 : * messages. Otherwise, search to see if there's a user column of the
6988 : * type. (We assume system columns are never of interesting types.)
6989 : * The search is needed because an index containing an expression
6990 : * column of the target type will just be recorded as a whole-relation
6991 : * dependency. If we do not find a column of the type, the dependency
6992 : * must indicate that the type is transiently referenced in an index
6993 : * expression but not stored on disk, which we assume is OK, just as
6994 : * we do for references in views. (It could also be that the target
6995 : * type is embedded in some container type that is stored in an index
6996 : * column, but the previous recursion should catch such cases.)
6997 : */
6998 284 : if (pg_depend->objsubid > 0 && pg_depend->objsubid <= tupleDesc->natts)
6999 126 : att = TupleDescAttr(tupleDesc, pg_depend->objsubid - 1);
7000 : else
7001 : {
7002 158 : att = NULL;
7003 406 : for (int attno = 1; attno <= tupleDesc->natts; attno++)
7004 : {
7005 254 : att = TupleDescAttr(tupleDesc, attno - 1);
7006 254 : if (att->atttypid == typeOid && !att->attisdropped)
7007 6 : break;
7008 248 : att = NULL;
7009 : }
7010 158 : if (att == NULL)
7011 : {
7012 : /* No such column, so assume OK */
7013 152 : relation_close(rel, AccessShareLock);
7014 152 : continue;
7015 : }
7016 : }
7017 :
7018 : /*
7019 : * We definitely should reject if the relation has storage. If it's
7020 : * partitioned, then perhaps we don't have to reject: if there are
7021 : * partitions then we'll fail when we find one, else there is no
7022 : * stored data to worry about. However, it's possible that the type
7023 : * change would affect conclusions about whether the type is sortable
7024 : * or hashable and thus (if it's a partitioning column) break the
7025 : * partitioning rule. For now, reject for partitioned rels too.
7026 : */
7027 132 : if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind) ||
7028 0 : RELKIND_HAS_PARTITIONS(rel->rd_rel->relkind))
7029 : {
7030 132 : if (origTypeName)
7031 30 : ereport(ERROR,
7032 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7033 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7034 : origTypeName,
7035 : RelationGetRelationName(rel),
7036 : NameStr(att->attname))));
7037 102 : else if (origRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7038 18 : ereport(ERROR,
7039 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7040 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7041 : RelationGetRelationName(origRelation),
7042 : RelationGetRelationName(rel),
7043 : NameStr(att->attname))));
7044 84 : else if (origRelation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
7045 6 : ereport(ERROR,
7046 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7047 : errmsg("cannot alter foreign table \"%s\" because column \"%s.%s\" uses its row type",
7048 : RelationGetRelationName(origRelation),
7049 : RelationGetRelationName(rel),
7050 : NameStr(att->attname))));
7051 : else
7052 78 : ereport(ERROR,
7053 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7054 : errmsg("cannot alter table \"%s\" because column \"%s.%s\" uses its row type",
7055 : RelationGetRelationName(origRelation),
7056 : RelationGetRelationName(rel),
7057 : NameStr(att->attname))));
7058 : }
7059 0 : else if (OidIsValid(rel->rd_rel->reltype))
7060 : {
7061 : /*
7062 : * A view or composite type itself isn't a problem, but we must
7063 : * recursively check for indirect dependencies via its rowtype.
7064 : */
7065 0 : find_composite_type_dependencies(rel->rd_rel->reltype,
7066 : origRelation, origTypeName);
7067 : }
7068 :
7069 0 : relation_close(rel, AccessShareLock);
7070 : }
7071 :
7072 4394 : systable_endscan(depScan);
7073 :
7074 4394 : relation_close(depRel, AccessShareLock);
7075 4394 : }
7076 :
7077 :
7078 : /*
7079 : * find_typed_table_dependencies
7080 : *
7081 : * Check to see if a composite type is being used as the type of a
7082 : * typed table. Abort if any are found and behavior is RESTRICT.
7083 : * Else return the list of tables.
7084 : */
7085 : static List *
7086 216 : find_typed_table_dependencies(Oid typeOid, const char *typeName, DropBehavior behavior)
7087 : {
7088 : Relation classRel;
7089 : ScanKeyData key[1];
7090 : TableScanDesc scan;
7091 : HeapTuple tuple;
7092 216 : List *result = NIL;
7093 :
7094 216 : classRel = table_open(RelationRelationId, AccessShareLock);
7095 :
7096 216 : ScanKeyInit(&key[0],
7097 : Anum_pg_class_reloftype,
7098 : BTEqualStrategyNumber, F_OIDEQ,
7099 : ObjectIdGetDatum(typeOid));
7100 :
7101 216 : scan = table_beginscan_catalog(classRel, 1, key);
7102 :
7103 252 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
7104 : {
7105 60 : Form_pg_class classform = (Form_pg_class) GETSTRUCT(tuple);
7106 :
7107 60 : if (behavior == DROP_RESTRICT)
7108 24 : ereport(ERROR,
7109 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
7110 : errmsg("cannot alter type \"%s\" because it is the type of a typed table",
7111 : typeName),
7112 : errhint("Use ALTER ... CASCADE to alter the typed tables too.")));
7113 : else
7114 36 : result = lappend_oid(result, classform->oid);
7115 : }
7116 :
7117 192 : table_endscan(scan);
7118 192 : table_close(classRel, AccessShareLock);
7119 :
7120 192 : return result;
7121 : }
7122 :
7123 :
7124 : /*
7125 : * check_of_type
7126 : *
7127 : * Check whether a type is suitable for CREATE TABLE OF/ALTER TABLE OF. If it
7128 : * isn't suitable, throw an error. Currently, we require that the type
7129 : * originated with CREATE TYPE AS. We could support any row type, but doing so
7130 : * would require handling a number of extra corner cases in the DDL commands.
7131 : * (Also, allowing domain-over-composite would open up a can of worms about
7132 : * whether and how the domain's constraints should apply to derived tables.)
7133 : */
7134 : void
7135 182 : check_of_type(HeapTuple typetuple)
7136 : {
7137 182 : Form_pg_type typ = (Form_pg_type) GETSTRUCT(typetuple);
7138 182 : bool typeOk = false;
7139 :
7140 182 : if (typ->typtype == TYPTYPE_COMPOSITE)
7141 : {
7142 : Relation typeRelation;
7143 :
7144 : Assert(OidIsValid(typ->typrelid));
7145 176 : typeRelation = relation_open(typ->typrelid, AccessShareLock);
7146 176 : typeOk = (typeRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
7147 :
7148 : /*
7149 : * Close the parent rel, but keep our AccessShareLock on it until xact
7150 : * commit. That will prevent someone else from deleting or ALTERing
7151 : * the type before the typed table creation/conversion commits.
7152 : */
7153 176 : relation_close(typeRelation, NoLock);
7154 :
7155 176 : if (!typeOk)
7156 6 : ereport(ERROR,
7157 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7158 : errmsg("type %s is the row type of another table",
7159 : format_type_be(typ->oid)),
7160 : errdetail("A typed table must use a stand-alone composite type created with CREATE TYPE.")));
7161 : }
7162 : else
7163 6 : ereport(ERROR,
7164 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7165 : errmsg("type %s is not a composite type",
7166 : format_type_be(typ->oid))));
7167 170 : }
7168 :
7169 :
7170 : /*
7171 : * ALTER TABLE ADD COLUMN
7172 : *
7173 : * Adds an additional attribute to a relation making the assumption that
7174 : * CHECK, NOT NULL, and FOREIGN KEY constraints will be removed from the
7175 : * AT_AddColumn AlterTableCmd by parse_utilcmd.c and added as independent
7176 : * AlterTableCmd's.
7177 : *
7178 : * ADD COLUMN cannot use the normal ALTER TABLE recursion mechanism, because we
7179 : * have to decide at runtime whether to recurse or not depending on whether we
7180 : * actually add a column or merely merge with an existing column. (We can't
7181 : * check this in a static pre-pass because it won't handle multiple inheritance
7182 : * situations correctly.)
7183 : */
7184 : static void
7185 2214 : ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
7186 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
7187 : AlterTableUtilityContext *context)
7188 : {
7189 2214 : if (rel->rd_rel->reloftype && !recursing)
7190 6 : ereport(ERROR,
7191 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7192 : errmsg("cannot add column to typed table")));
7193 :
7194 2208 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7195 58 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
7196 :
7197 2202 : if (recurse && !is_view)
7198 2102 : cmd->recurse = true;
7199 2202 : }
7200 :
7201 : /*
7202 : * Add a column to a table. The return value is the address of the
7203 : * new column in the parent relation.
7204 : *
7205 : * cmd is pass-by-ref so that we can replace it with the parse-transformed
7206 : * copy (but that happens only after we check for IF NOT EXISTS).
7207 : */
7208 : static ObjectAddress
7209 2934 : ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
7210 : AlterTableCmd **cmd, bool recurse, bool recursing,
7211 : LOCKMODE lockmode, AlterTablePass cur_pass,
7212 : AlterTableUtilityContext *context)
7213 : {
7214 2934 : Oid myrelid = RelationGetRelid(rel);
7215 2934 : ColumnDef *colDef = castNode(ColumnDef, (*cmd)->def);
7216 2934 : bool if_not_exists = (*cmd)->missing_ok;
7217 : Relation pgclass,
7218 : attrdesc;
7219 : HeapTuple reltup;
7220 : Form_pg_class relform;
7221 : Form_pg_attribute attribute;
7222 : int newattnum;
7223 : char relkind;
7224 : Expr *defval;
7225 : List *children;
7226 : ListCell *child;
7227 : AlterTableCmd *childcmd;
7228 : ObjectAddress address;
7229 : TupleDesc tupdesc;
7230 :
7231 : /* since this function recurses, it could be driven to stack overflow */
7232 2934 : check_stack_depth();
7233 :
7234 : /* At top level, permission check was done in ATPrepCmd, else do it */
7235 2934 : if (recursing)
7236 738 : ATSimplePermissions((*cmd)->subtype, rel,
7237 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
7238 :
7239 2934 : if (rel->rd_rel->relispartition && !recursing)
7240 12 : ereport(ERROR,
7241 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7242 : errmsg("cannot add column to a partition")));
7243 :
7244 2922 : attrdesc = table_open(AttributeRelationId, RowExclusiveLock);
7245 :
7246 : /*
7247 : * Are we adding the column to a recursion child? If so, check whether to
7248 : * merge with an existing definition for the column. If we do merge, we
7249 : * must not recurse. Children will already have the column, and recursing
7250 : * into them would mess up attinhcount.
7251 : */
7252 2922 : if (colDef->inhcount > 0)
7253 : {
7254 : HeapTuple tuple;
7255 :
7256 : /* Does child already have a column by this name? */
7257 738 : tuple = SearchSysCacheCopyAttName(myrelid, colDef->colname);
7258 738 : if (HeapTupleIsValid(tuple))
7259 : {
7260 60 : Form_pg_attribute childatt = (Form_pg_attribute) GETSTRUCT(tuple);
7261 : Oid ctypeId;
7262 : int32 ctypmod;
7263 : Oid ccollid;
7264 :
7265 : /* Child column must match on type, typmod, and collation */
7266 60 : typenameTypeIdAndMod(NULL, colDef->typeName, &ctypeId, &ctypmod);
7267 60 : if (ctypeId != childatt->atttypid ||
7268 60 : ctypmod != childatt->atttypmod)
7269 0 : ereport(ERROR,
7270 : (errcode(ERRCODE_DATATYPE_MISMATCH),
7271 : errmsg("child table \"%s\" has different type for column \"%s\"",
7272 : RelationGetRelationName(rel), colDef->colname)));
7273 60 : ccollid = GetColumnDefCollation(NULL, colDef, ctypeId);
7274 60 : if (ccollid != childatt->attcollation)
7275 0 : ereport(ERROR,
7276 : (errcode(ERRCODE_COLLATION_MISMATCH),
7277 : errmsg("child table \"%s\" has different collation for column \"%s\"",
7278 : RelationGetRelationName(rel), colDef->colname),
7279 : errdetail("\"%s\" versus \"%s\"",
7280 : get_collation_name(ccollid),
7281 : get_collation_name(childatt->attcollation))));
7282 :
7283 : /* Bump the existing child att's inhcount */
7284 60 : if (pg_add_s16_overflow(childatt->attinhcount, 1,
7285 : &childatt->attinhcount))
7286 0 : ereport(ERROR,
7287 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7288 : errmsg("too many inheritance parents"));
7289 60 : CatalogTupleUpdate(attrdesc, &tuple->t_self, tuple);
7290 :
7291 60 : heap_freetuple(tuple);
7292 :
7293 : /* Inform the user about the merge */
7294 60 : ereport(NOTICE,
7295 : (errmsg("merging definition of column \"%s\" for child \"%s\"",
7296 : colDef->colname, RelationGetRelationName(rel))));
7297 :
7298 60 : table_close(attrdesc, RowExclusiveLock);
7299 :
7300 : /* Make the child column change visible */
7301 60 : CommandCounterIncrement();
7302 :
7303 60 : return InvalidObjectAddress;
7304 : }
7305 : }
7306 :
7307 : /* skip if the name already exists and if_not_exists is true */
7308 2862 : if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
7309 : {
7310 54 : table_close(attrdesc, RowExclusiveLock);
7311 54 : return InvalidObjectAddress;
7312 : }
7313 :
7314 : /*
7315 : * Okay, we need to add the column, so go ahead and do parse
7316 : * transformation. This can result in queueing up, or even immediately
7317 : * executing, subsidiary operations (such as creation of unique indexes);
7318 : * so we mustn't do it until we have made the if_not_exists check.
7319 : *
7320 : * When recursing, the command was already transformed and we needn't do
7321 : * so again. Also, if context isn't given we can't transform. (That
7322 : * currently happens only for AT_AddColumnToView; we expect that view.c
7323 : * passed us a ColumnDef that doesn't need work.)
7324 : */
7325 2778 : if (context != NULL && !recursing)
7326 : {
7327 2076 : *cmd = ATParseTransformCmd(wqueue, tab, rel, *cmd, recurse, lockmode,
7328 : cur_pass, context);
7329 : Assert(*cmd != NULL);
7330 2070 : colDef = castNode(ColumnDef, (*cmd)->def);
7331 : }
7332 :
7333 : /*
7334 : * Regular inheritance children are independent enough not to inherit the
7335 : * identity column from parent hence cannot recursively add identity
7336 : * column if the table has inheritance children.
7337 : *
7338 : * Partitions, on the other hand, are integral part of a partitioned table
7339 : * and inherit identity column. Hence propagate identity column down the
7340 : * partition hierarchy.
7341 : */
7342 2772 : if (colDef->identity &&
7343 54 : recurse &&
7344 102 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE &&
7345 48 : find_inheritance_children(myrelid, NoLock) != NIL)
7346 6 : ereport(ERROR,
7347 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7348 : errmsg("cannot recursively add identity column to table that has child tables")));
7349 :
7350 2766 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
7351 :
7352 2766 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
7353 2766 : if (!HeapTupleIsValid(reltup))
7354 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
7355 2766 : relform = (Form_pg_class) GETSTRUCT(reltup);
7356 2766 : relkind = relform->relkind;
7357 :
7358 : /* Determine the new attribute's number */
7359 2766 : newattnum = relform->relnatts + 1;
7360 2766 : if (newattnum > MaxHeapAttributeNumber)
7361 0 : ereport(ERROR,
7362 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
7363 : errmsg("tables can have at most %d columns",
7364 : MaxHeapAttributeNumber)));
7365 :
7366 : /*
7367 : * Construct new attribute's pg_attribute entry.
7368 : */
7369 2766 : tupdesc = BuildDescForRelation(list_make1(colDef));
7370 :
7371 2754 : attribute = TupleDescAttr(tupdesc, 0);
7372 :
7373 : /* Fix up attribute number */
7374 2754 : attribute->attnum = newattnum;
7375 :
7376 : /* make sure datatype is legal for a column */
7377 5508 : CheckAttributeType(NameStr(attribute->attname), attribute->atttypid, attribute->attcollation,
7378 2754 : list_make1_oid(rel->rd_rel->reltype),
7379 2754 : (attribute->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
7380 :
7381 2718 : InsertPgAttributeTuples(attrdesc, tupdesc, myrelid, NULL, NULL);
7382 :
7383 2718 : table_close(attrdesc, RowExclusiveLock);
7384 :
7385 : /*
7386 : * Update pg_class tuple as appropriate
7387 : */
7388 2718 : relform->relnatts = newattnum;
7389 :
7390 2718 : CatalogTupleUpdate(pgclass, &reltup->t_self, reltup);
7391 :
7392 2718 : heap_freetuple(reltup);
7393 :
7394 : /* Post creation hook for new attribute */
7395 2718 : InvokeObjectPostCreateHook(RelationRelationId, myrelid, newattnum);
7396 :
7397 2718 : table_close(pgclass, RowExclusiveLock);
7398 :
7399 : /* Make the attribute's catalog entry visible */
7400 2718 : CommandCounterIncrement();
7401 :
7402 : /*
7403 : * Store the DEFAULT, if any, in the catalogs
7404 : */
7405 2718 : if (colDef->raw_default)
7406 : {
7407 : RawColumnDefault *rawEnt;
7408 :
7409 950 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
7410 950 : rawEnt->attnum = attribute->attnum;
7411 950 : rawEnt->raw_default = copyObject(colDef->raw_default);
7412 950 : rawEnt->generated = colDef->generated;
7413 :
7414 : /*
7415 : * This function is intended for CREATE TABLE, so it processes a
7416 : * _list_ of defaults, but we just do one.
7417 : */
7418 950 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
7419 : false, true, false, NULL);
7420 :
7421 : /* Make the additional catalog changes visible */
7422 926 : CommandCounterIncrement();
7423 : }
7424 :
7425 : /*
7426 : * Tell Phase 3 to fill in the default expression, if there is one.
7427 : *
7428 : * If there is no default, Phase 3 doesn't have to do anything, because
7429 : * that effectively means that the default is NULL. The heap tuple access
7430 : * routines always check for attnum > # of attributes in tuple, and return
7431 : * NULL if so, so without any modification of the tuple data we will get
7432 : * the effect of NULL values in the new column.
7433 : *
7434 : * An exception occurs when the new column is of a domain type: the domain
7435 : * might have a not-null constraint, or a check constraint that indirectly
7436 : * rejects nulls. If there are any domain constraints then we construct
7437 : * an explicit NULL default value that will be passed through
7438 : * CoerceToDomain processing. (This is a tad inefficient, since it causes
7439 : * rewriting the table which we really wouldn't have to do; but we do it
7440 : * to preserve the historical behavior that such a failure will be raised
7441 : * only if the table currently contains some rows.)
7442 : *
7443 : * Note: we use build_column_default, and not just the cooked default
7444 : * returned by AddRelationNewConstraints, so that the right thing happens
7445 : * when a datatype's default applies.
7446 : *
7447 : * Note: it might seem that this should happen at the end of Phase 2, so
7448 : * that the effects of subsequent subcommands can be taken into account.
7449 : * It's intentional that we do it now, though. The new column should be
7450 : * filled according to what is said in the ADD COLUMN subcommand, so that
7451 : * the effects are the same as if this subcommand had been run by itself
7452 : * and the later subcommands had been issued in new ALTER TABLE commands.
7453 : *
7454 : * We can skip this entirely for relations without storage, since Phase 3
7455 : * is certainly not going to touch them.
7456 : */
7457 2694 : if (RELKIND_HAS_STORAGE(relkind))
7458 : {
7459 : bool has_domain_constraints;
7460 2318 : bool has_missing = false;
7461 :
7462 : /*
7463 : * For an identity column, we can't use build_column_default(),
7464 : * because the sequence ownership isn't set yet. So do it manually.
7465 : */
7466 2318 : if (colDef->identity)
7467 : {
7468 42 : NextValueExpr *nve = makeNode(NextValueExpr);
7469 :
7470 42 : nve->seqid = RangeVarGetRelid(colDef->identitySequence, NoLock, false);
7471 42 : nve->typeId = attribute->atttypid;
7472 :
7473 42 : defval = (Expr *) nve;
7474 : }
7475 : else
7476 2276 : defval = (Expr *) build_column_default(rel, attribute->attnum);
7477 :
7478 : /* Build CoerceToDomain(NULL) expression if needed */
7479 2318 : has_domain_constraints = DomainHasConstraints(attribute->atttypid);
7480 2318 : if (!defval && has_domain_constraints)
7481 : {
7482 : Oid baseTypeId;
7483 : int32 baseTypeMod;
7484 : Oid baseTypeColl;
7485 :
7486 6 : baseTypeMod = attribute->atttypmod;
7487 6 : baseTypeId = getBaseTypeAndTypmod(attribute->atttypid, &baseTypeMod);
7488 6 : baseTypeColl = get_typcollation(baseTypeId);
7489 6 : defval = (Expr *) makeNullConst(baseTypeId, baseTypeMod, baseTypeColl);
7490 6 : defval = (Expr *) coerce_to_target_type(NULL,
7491 : (Node *) defval,
7492 : baseTypeId,
7493 : attribute->atttypid,
7494 : attribute->atttypmod,
7495 : COERCION_ASSIGNMENT,
7496 : COERCE_IMPLICIT_CAST,
7497 : -1);
7498 6 : if (defval == NULL) /* should not happen */
7499 0 : elog(ERROR, "failed to coerce base type to domain");
7500 : }
7501 :
7502 2318 : if (defval)
7503 : {
7504 : NewColumnValue *newval;
7505 :
7506 : /* Prepare defval for execution, either here or in Phase 3 */
7507 822 : defval = expression_planner(defval);
7508 :
7509 : /* Add the new default to the newvals list */
7510 822 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
7511 822 : newval->attnum = attribute->attnum;
7512 822 : newval->expr = defval;
7513 822 : newval->is_generated = (colDef->generated != '\0');
7514 :
7515 822 : tab->newvals = lappend(tab->newvals, newval);
7516 :
7517 : /*
7518 : * Attempt to skip a complete table rewrite by storing the
7519 : * specified DEFAULT value outside of the heap. This is only
7520 : * allowed for plain relations and non-generated columns, and the
7521 : * default expression can't be volatile (stable is OK). Note that
7522 : * contain_volatile_functions deems CoerceToDomain immutable, but
7523 : * here we consider that coercion to a domain with constraints is
7524 : * volatile; else it might fail even when the table is empty.
7525 : */
7526 822 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
7527 822 : !colDef->generated &&
7528 694 : !has_domain_constraints &&
7529 682 : !contain_volatile_functions((Node *) defval))
7530 514 : {
7531 : EState *estate;
7532 : ExprState *exprState;
7533 : Datum missingval;
7534 : bool missingIsNull;
7535 :
7536 : /* Evaluate the default expression */
7537 514 : estate = CreateExecutorState();
7538 514 : exprState = ExecPrepareExpr(defval, estate);
7539 514 : missingval = ExecEvalExpr(exprState,
7540 514 : GetPerTupleExprContext(estate),
7541 : &missingIsNull);
7542 : /* If it turns out NULL, nothing to do; else store it */
7543 514 : if (!missingIsNull)
7544 : {
7545 514 : StoreAttrMissingVal(rel, attribute->attnum, missingval);
7546 : /* Make the additional catalog change visible */
7547 514 : CommandCounterIncrement();
7548 514 : has_missing = true;
7549 : }
7550 514 : FreeExecutorState(estate);
7551 : }
7552 : else
7553 : {
7554 : /*
7555 : * Failed to use missing mode. We have to do a table rewrite
7556 : * to install the value --- unless it's a virtual generated
7557 : * column.
7558 : */
7559 308 : if (colDef->generated != ATTRIBUTE_GENERATED_VIRTUAL)
7560 216 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7561 : }
7562 : }
7563 :
7564 2318 : if (!has_missing)
7565 : {
7566 : /*
7567 : * If the new column is NOT NULL, and there is no missing value,
7568 : * tell Phase 3 it needs to check for NULLs.
7569 : */
7570 1804 : tab->verify_new_notnull |= colDef->is_not_null;
7571 : }
7572 : }
7573 :
7574 : /*
7575 : * Add needed dependency entries for the new column.
7576 : */
7577 2694 : add_column_datatype_dependency(myrelid, newattnum, attribute->atttypid);
7578 2694 : add_column_collation_dependency(myrelid, newattnum, attribute->attcollation);
7579 :
7580 : /*
7581 : * Propagate to children as appropriate. Unlike most other ALTER
7582 : * routines, we have to do this one level of recursion at a time; we can't
7583 : * use find_all_inheritors to do it in one pass.
7584 : */
7585 : children =
7586 2694 : find_inheritance_children(RelationGetRelid(rel), lockmode);
7587 :
7588 : /*
7589 : * If we are told not to recurse, there had better not be any child
7590 : * tables; else the addition would put them out of step.
7591 : */
7592 2694 : if (children && !recurse)
7593 12 : ereport(ERROR,
7594 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7595 : errmsg("column must be added to child tables too")));
7596 :
7597 : /* Children should see column as singly inherited */
7598 2682 : if (!recursing)
7599 : {
7600 2004 : childcmd = copyObject(*cmd);
7601 2004 : colDef = castNode(ColumnDef, childcmd->def);
7602 2004 : colDef->inhcount = 1;
7603 2004 : colDef->is_local = false;
7604 : }
7605 : else
7606 678 : childcmd = *cmd; /* no need to copy again */
7607 :
7608 3420 : foreach(child, children)
7609 : {
7610 738 : Oid childrelid = lfirst_oid(child);
7611 : Relation childrel;
7612 : AlteredTableInfo *childtab;
7613 :
7614 : /* find_inheritance_children already got lock */
7615 738 : childrel = table_open(childrelid, NoLock);
7616 738 : CheckAlterTableIsSafe(childrel);
7617 :
7618 : /* Find or create work queue entry for this table */
7619 738 : childtab = ATGetQueueEntry(wqueue, childrel);
7620 :
7621 : /* Recurse to child; return value is ignored */
7622 738 : ATExecAddColumn(wqueue, childtab, childrel,
7623 : &childcmd, recurse, true,
7624 : lockmode, cur_pass, context);
7625 :
7626 738 : table_close(childrel, NoLock);
7627 : }
7628 :
7629 2682 : ObjectAddressSubSet(address, RelationRelationId, myrelid, newattnum);
7630 2682 : return address;
7631 : }
7632 :
7633 : /*
7634 : * If a new or renamed column will collide with the name of an existing
7635 : * column and if_not_exists is false then error out, else do nothing.
7636 : */
7637 : static bool
7638 3312 : check_for_column_name_collision(Relation rel, const char *colname,
7639 : bool if_not_exists)
7640 : {
7641 : HeapTuple attTuple;
7642 : int attnum;
7643 :
7644 : /*
7645 : * this test is deliberately not attisdropped-aware, since if one tries to
7646 : * add a column matching a dropped column name, it's gonna fail anyway.
7647 : */
7648 3312 : attTuple = SearchSysCache2(ATTNAME,
7649 : ObjectIdGetDatum(RelationGetRelid(rel)),
7650 : PointerGetDatum(colname));
7651 3312 : if (!HeapTupleIsValid(attTuple))
7652 3216 : return true;
7653 :
7654 96 : attnum = ((Form_pg_attribute) GETSTRUCT(attTuple))->attnum;
7655 96 : ReleaseSysCache(attTuple);
7656 :
7657 : /*
7658 : * We throw a different error message for conflicts with system column
7659 : * names, since they are normally not shown and the user might otherwise
7660 : * be confused about the reason for the conflict.
7661 : */
7662 96 : if (attnum <= 0)
7663 12 : ereport(ERROR,
7664 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7665 : errmsg("column name \"%s\" conflicts with a system column name",
7666 : colname)));
7667 : else
7668 : {
7669 84 : if (if_not_exists)
7670 : {
7671 54 : ereport(NOTICE,
7672 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7673 : errmsg("column \"%s\" of relation \"%s\" already exists, skipping",
7674 : colname, RelationGetRelationName(rel))));
7675 54 : return false;
7676 : }
7677 :
7678 30 : ereport(ERROR,
7679 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7680 : errmsg("column \"%s\" of relation \"%s\" already exists",
7681 : colname, RelationGetRelationName(rel))));
7682 : }
7683 :
7684 : return true;
7685 : }
7686 :
7687 : /*
7688 : * Install a column's dependency on its datatype.
7689 : */
7690 : static void
7691 3730 : add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid)
7692 : {
7693 : ObjectAddress myself,
7694 : referenced;
7695 :
7696 3730 : myself.classId = RelationRelationId;
7697 3730 : myself.objectId = relid;
7698 3730 : myself.objectSubId = attnum;
7699 3730 : referenced.classId = TypeRelationId;
7700 3730 : referenced.objectId = typid;
7701 3730 : referenced.objectSubId = 0;
7702 3730 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7703 3730 : }
7704 :
7705 : /*
7706 : * Install a column's dependency on its collation.
7707 : */
7708 : static void
7709 3730 : add_column_collation_dependency(Oid relid, int32 attnum, Oid collid)
7710 : {
7711 : ObjectAddress myself,
7712 : referenced;
7713 :
7714 : /* We know the default collation is pinned, so don't bother recording it */
7715 3730 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
7716 : {
7717 18 : myself.classId = RelationRelationId;
7718 18 : myself.objectId = relid;
7719 18 : myself.objectSubId = attnum;
7720 18 : referenced.classId = CollationRelationId;
7721 18 : referenced.objectId = collid;
7722 18 : referenced.objectSubId = 0;
7723 18 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7724 : }
7725 3730 : }
7726 :
7727 : /*
7728 : * ALTER TABLE ALTER COLUMN DROP NOT NULL
7729 : *
7730 : * Return the address of the modified column. If the column was already
7731 : * nullable, InvalidObjectAddress is returned.
7732 : */
7733 : static ObjectAddress
7734 268 : ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
7735 : LOCKMODE lockmode)
7736 : {
7737 : HeapTuple tuple;
7738 : HeapTuple conTup;
7739 : Form_pg_attribute attTup;
7740 : AttrNumber attnum;
7741 : Relation attr_rel;
7742 : ObjectAddress address;
7743 :
7744 : /*
7745 : * lookup the attribute
7746 : */
7747 268 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7748 :
7749 268 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
7750 268 : if (!HeapTupleIsValid(tuple))
7751 18 : ereport(ERROR,
7752 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7753 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7754 : colName, RelationGetRelationName(rel))));
7755 250 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
7756 250 : attnum = attTup->attnum;
7757 250 : ObjectAddressSubSet(address, RelationRelationId,
7758 : RelationGetRelid(rel), attnum);
7759 :
7760 : /* If the column is already nullable there's nothing to do. */
7761 250 : if (!attTup->attnotnull)
7762 : {
7763 0 : table_close(attr_rel, RowExclusiveLock);
7764 0 : return InvalidObjectAddress;
7765 : }
7766 :
7767 : /* Prevent them from altering a system attribute */
7768 250 : if (attnum <= 0)
7769 0 : ereport(ERROR,
7770 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7771 : errmsg("cannot alter system column \"%s\"",
7772 : colName)));
7773 :
7774 250 : if (attTup->attidentity)
7775 18 : ereport(ERROR,
7776 : (errcode(ERRCODE_SYNTAX_ERROR),
7777 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
7778 : colName, RelationGetRelationName(rel))));
7779 :
7780 : /*
7781 : * If rel is partition, shouldn't drop NOT NULL if parent has the same.
7782 : */
7783 232 : if (rel->rd_rel->relispartition)
7784 : {
7785 12 : Oid parentId = get_partition_parent(RelationGetRelid(rel), false);
7786 12 : Relation parent = table_open(parentId, AccessShareLock);
7787 12 : TupleDesc tupDesc = RelationGetDescr(parent);
7788 : AttrNumber parent_attnum;
7789 :
7790 12 : parent_attnum = get_attnum(parentId, colName);
7791 12 : if (TupleDescAttr(tupDesc, parent_attnum - 1)->attnotnull)
7792 12 : ereport(ERROR,
7793 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7794 : errmsg("column \"%s\" is marked NOT NULL in parent table",
7795 : colName)));
7796 0 : table_close(parent, AccessShareLock);
7797 : }
7798 :
7799 : /*
7800 : * Find the constraint that makes this column NOT NULL, and drop it.
7801 : * dropconstraint_internal() resets attnotnull.
7802 : */
7803 220 : conTup = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7804 220 : if (conTup == NULL)
7805 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
7806 : colName, RelationGetRelationName(rel));
7807 :
7808 : /* The normal case: we have a pg_constraint row, remove it */
7809 220 : dropconstraint_internal(rel, conTup, DROP_RESTRICT, recurse, false,
7810 : false, lockmode);
7811 166 : heap_freetuple(conTup);
7812 :
7813 166 : InvokeObjectPostAlterHook(RelationRelationId,
7814 : RelationGetRelid(rel), attnum);
7815 :
7816 166 : table_close(attr_rel, RowExclusiveLock);
7817 :
7818 166 : return address;
7819 : }
7820 :
7821 : /*
7822 : * set_attnotnull
7823 : * Helper to update/validate the pg_attribute status of a not-null
7824 : * constraint
7825 : *
7826 : * pg_attribute.attnotnull is set true, if it isn't already.
7827 : * If queue_validation is true, also set up wqueue to validate the constraint.
7828 : * wqueue may be given as NULL when validation is not needed (e.g., on table
7829 : * creation).
7830 : */
7831 : static void
7832 25302 : set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
7833 : bool is_valid, bool queue_validation)
7834 : {
7835 : Form_pg_attribute attr;
7836 : CompactAttribute *thisatt;
7837 :
7838 : Assert(!queue_validation || wqueue);
7839 :
7840 25302 : CheckAlterTableIsSafe(rel);
7841 :
7842 : /*
7843 : * Exit quickly by testing attnotnull from the tupledesc's copy of the
7844 : * attribute.
7845 : */
7846 25302 : attr = TupleDescAttr(RelationGetDescr(rel), attnum - 1);
7847 25302 : if (attr->attisdropped)
7848 0 : return;
7849 :
7850 25302 : if (!attr->attnotnull)
7851 : {
7852 : Relation attr_rel;
7853 : HeapTuple tuple;
7854 :
7855 1462 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7856 :
7857 1462 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
7858 1462 : if (!HeapTupleIsValid(tuple))
7859 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
7860 : attnum, RelationGetRelid(rel));
7861 :
7862 1462 : thisatt = TupleDescCompactAttr(RelationGetDescr(rel), attnum - 1);
7863 1462 : thisatt->attnullability = ATTNULLABLE_VALID;
7864 :
7865 1462 : attr = (Form_pg_attribute) GETSTRUCT(tuple);
7866 :
7867 1462 : attr->attnotnull = true;
7868 1462 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
7869 :
7870 : /*
7871 : * If the nullness isn't already proven by validated constraints, have
7872 : * ALTER TABLE phase 3 test for it.
7873 : */
7874 1462 : if (queue_validation && wqueue &&
7875 1244 : !NotNullImpliedByRelConstraints(rel, attr))
7876 : {
7877 : AlteredTableInfo *tab;
7878 :
7879 1194 : tab = ATGetQueueEntry(wqueue, rel);
7880 1194 : tab->verify_new_notnull = true;
7881 : }
7882 :
7883 1462 : CommandCounterIncrement();
7884 :
7885 1462 : table_close(attr_rel, RowExclusiveLock);
7886 1462 : heap_freetuple(tuple);
7887 : }
7888 : else
7889 : {
7890 23840 : CacheInvalidateRelcache(rel);
7891 : }
7892 : }
7893 :
7894 : /*
7895 : * ALTER TABLE ALTER COLUMN SET NOT NULL
7896 : *
7897 : * Add a not-null constraint to a single table and its children. Returns
7898 : * the address of the constraint added to the parent relation, if one gets
7899 : * added, or InvalidObjectAddress otherwise.
7900 : *
7901 : * We must recurse to child tables during execution, rather than using
7902 : * ALTER TABLE's normal prep-time recursion.
7903 : */
7904 : static ObjectAddress
7905 712 : ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
7906 : bool recurse, bool recursing, LOCKMODE lockmode)
7907 : {
7908 : HeapTuple tuple;
7909 : AttrNumber attnum;
7910 : ObjectAddress address;
7911 : Constraint *constraint;
7912 : CookedConstraint *ccon;
7913 : List *cooked;
7914 712 : bool is_no_inherit = false;
7915 :
7916 : /* Guard against stack overflow due to overly deep inheritance tree. */
7917 712 : check_stack_depth();
7918 :
7919 : /* At top level, permission check was done in ATPrepCmd, else do it */
7920 712 : if (recursing)
7921 : {
7922 298 : ATSimplePermissions(AT_AddConstraint, rel,
7923 : ATT_PARTITIONED_TABLE | ATT_TABLE | ATT_FOREIGN_TABLE);
7924 : Assert(conName != NULL);
7925 : }
7926 :
7927 712 : attnum = get_attnum(RelationGetRelid(rel), colName);
7928 712 : if (attnum == InvalidAttrNumber)
7929 18 : ereport(ERROR,
7930 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7931 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7932 : colName, RelationGetRelationName(rel))));
7933 :
7934 : /* Prevent them from altering a system attribute */
7935 694 : if (attnum <= 0)
7936 0 : ereport(ERROR,
7937 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7938 : errmsg("cannot alter system column \"%s\"",
7939 : colName)));
7940 :
7941 : /* See if there's already a constraint */
7942 694 : tuple = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7943 694 : if (HeapTupleIsValid(tuple))
7944 : {
7945 158 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
7946 158 : bool changed = false;
7947 :
7948 : /*
7949 : * Don't let a NO INHERIT constraint be changed into inherit.
7950 : */
7951 158 : if (conForm->connoinherit && recurse)
7952 12 : ereport(ERROR,
7953 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7954 : errmsg("cannot change NO INHERIT status of NOT NULL constraint \"%s\" on relation \"%s\"",
7955 : NameStr(conForm->conname),
7956 : RelationGetRelationName(rel)));
7957 :
7958 : /*
7959 : * If we find an appropriate constraint, we're almost done, but just
7960 : * need to change some properties on it: if we're recursing, increment
7961 : * coninhcount; if not, set conislocal if not already set.
7962 : */
7963 146 : if (recursing)
7964 : {
7965 102 : if (pg_add_s16_overflow(conForm->coninhcount, 1,
7966 : &conForm->coninhcount))
7967 0 : ereport(ERROR,
7968 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7969 : errmsg("too many inheritance parents"));
7970 102 : changed = true;
7971 : }
7972 44 : else if (!conForm->conislocal)
7973 : {
7974 0 : conForm->conislocal = true;
7975 0 : changed = true;
7976 : }
7977 44 : else if (!conForm->convalidated)
7978 : {
7979 : /*
7980 : * Flip attnotnull and convalidated, and also validate the
7981 : * constraint.
7982 : */
7983 24 : return ATExecValidateConstraint(wqueue, rel, NameStr(conForm->conname),
7984 : recurse, recursing, lockmode);
7985 : }
7986 :
7987 122 : if (changed)
7988 : {
7989 : Relation constr_rel;
7990 :
7991 102 : constr_rel = table_open(ConstraintRelationId, RowExclusiveLock);
7992 :
7993 102 : CatalogTupleUpdate(constr_rel, &tuple->t_self, tuple);
7994 102 : ObjectAddressSet(address, ConstraintRelationId, conForm->oid);
7995 102 : table_close(constr_rel, RowExclusiveLock);
7996 : }
7997 :
7998 122 : if (changed)
7999 102 : return address;
8000 : else
8001 20 : return InvalidObjectAddress;
8002 : }
8003 :
8004 : /*
8005 : * If we're asked not to recurse, and children exist, raise an error for
8006 : * partitioned tables. For inheritance, we act as if NO INHERIT had been
8007 : * specified.
8008 : */
8009 566 : if (!recurse &&
8010 30 : find_inheritance_children(RelationGetRelid(rel),
8011 : NoLock) != NIL)
8012 : {
8013 18 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
8014 6 : ereport(ERROR,
8015 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8016 : errmsg("constraint must be added to child tables too"),
8017 : errhint("Do not specify the ONLY keyword."));
8018 : else
8019 12 : is_no_inherit = true;
8020 : }
8021 :
8022 : /*
8023 : * No constraint exists; we must add one. First determine a name to use,
8024 : * if we haven't already.
8025 : */
8026 530 : if (!recursing)
8027 : {
8028 : Assert(conName == NULL);
8029 340 : conName = ChooseConstraintName(RelationGetRelationName(rel),
8030 : colName, "not_null",
8031 340 : RelationGetNamespace(rel),
8032 : NIL);
8033 : }
8034 :
8035 530 : constraint = makeNotNullConstraint(makeString(colName));
8036 530 : constraint->is_no_inherit = is_no_inherit;
8037 530 : constraint->conname = conName;
8038 :
8039 : /* and do it */
8040 530 : cooked = AddRelationNewConstraints(rel, NIL, list_make1(constraint),
8041 530 : false, !recursing, false, NULL);
8042 530 : ccon = linitial(cooked);
8043 530 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
8044 :
8045 530 : InvokeObjectPostAlterHook(RelationRelationId,
8046 : RelationGetRelid(rel), attnum);
8047 :
8048 : /* Mark pg_attribute.attnotnull for the column and queue validation */
8049 530 : set_attnotnull(wqueue, rel, attnum, true, true);
8050 :
8051 : /*
8052 : * Recurse to propagate the constraint to children that don't have one.
8053 : */
8054 530 : if (recurse)
8055 : {
8056 : List *children;
8057 :
8058 506 : children = find_inheritance_children(RelationGetRelid(rel),
8059 : lockmode);
8060 :
8061 1244 : foreach_oid(childoid, children)
8062 : {
8063 244 : Relation childrel = table_open(childoid, NoLock);
8064 :
8065 244 : CommandCounterIncrement();
8066 :
8067 244 : ATExecSetNotNull(wqueue, childrel, conName, colName,
8068 : recurse, true, lockmode);
8069 238 : table_close(childrel, NoLock);
8070 : }
8071 : }
8072 :
8073 524 : return address;
8074 : }
8075 :
8076 : /*
8077 : * NotNullImpliedByRelConstraints
8078 : * Does rel's existing constraints imply NOT NULL for the given attribute?
8079 : */
8080 : static bool
8081 1244 : NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr)
8082 : {
8083 1244 : NullTest *nnulltest = makeNode(NullTest);
8084 :
8085 2488 : nnulltest->arg = (Expr *) makeVar(1,
8086 1244 : attr->attnum,
8087 : attr->atttypid,
8088 : attr->atttypmod,
8089 : attr->attcollation,
8090 : 0);
8091 1244 : nnulltest->nulltesttype = IS_NOT_NULL;
8092 :
8093 : /*
8094 : * argisrow = false is correct even for a composite column, because
8095 : * attnotnull does not represent a SQL-spec IS NOT NULL test in such a
8096 : * case, just IS DISTINCT FROM NULL.
8097 : */
8098 1244 : nnulltest->argisrow = false;
8099 1244 : nnulltest->location = -1;
8100 :
8101 1244 : if (ConstraintImpliedByRelConstraint(rel, list_make1(nnulltest), NIL))
8102 : {
8103 50 : ereport(DEBUG1,
8104 : (errmsg_internal("existing constraints on column \"%s.%s\" are sufficient to prove that it does not contain nulls",
8105 : RelationGetRelationName(rel), NameStr(attr->attname))));
8106 50 : return true;
8107 : }
8108 :
8109 1194 : return false;
8110 : }
8111 :
8112 : /*
8113 : * ALTER TABLE ALTER COLUMN SET/DROP DEFAULT
8114 : *
8115 : * Return the address of the affected column.
8116 : */
8117 : static ObjectAddress
8118 584 : ATExecColumnDefault(Relation rel, const char *colName,
8119 : Node *newDefault, LOCKMODE lockmode)
8120 : {
8121 584 : TupleDesc tupdesc = RelationGetDescr(rel);
8122 : AttrNumber attnum;
8123 : ObjectAddress address;
8124 :
8125 : /*
8126 : * get the number of the attribute
8127 : */
8128 584 : attnum = get_attnum(RelationGetRelid(rel), colName);
8129 584 : if (attnum == InvalidAttrNumber)
8130 30 : ereport(ERROR,
8131 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8132 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8133 : colName, RelationGetRelationName(rel))));
8134 :
8135 : /* Prevent them from altering a system attribute */
8136 554 : if (attnum <= 0)
8137 0 : ereport(ERROR,
8138 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8139 : errmsg("cannot alter system column \"%s\"",
8140 : colName)));
8141 :
8142 554 : if (TupleDescAttr(tupdesc, attnum - 1)->attidentity)
8143 18 : ereport(ERROR,
8144 : (errcode(ERRCODE_SYNTAX_ERROR),
8145 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
8146 : colName, RelationGetRelationName(rel)),
8147 : /* translator: %s is an SQL ALTER command */
8148 : newDefault ? 0 : errhint("Use %s instead.",
8149 : "ALTER TABLE ... ALTER COLUMN ... DROP IDENTITY")));
8150 :
8151 536 : if (TupleDescAttr(tupdesc, attnum - 1)->attgenerated)
8152 12 : ereport(ERROR,
8153 : (errcode(ERRCODE_SYNTAX_ERROR),
8154 : errmsg("column \"%s\" of relation \"%s\" is a generated column",
8155 : colName, RelationGetRelationName(rel)),
8156 : newDefault ?
8157 : /* translator: %s is an SQL ALTER command */
8158 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... SET EXPRESSION") :
8159 : (TupleDescAttr(tupdesc, attnum - 1)->attgenerated == ATTRIBUTE_GENERATED_STORED ?
8160 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION") : 0)));
8161 :
8162 : /*
8163 : * Remove any old default for the column. We use RESTRICT here for
8164 : * safety, but at present we do not expect anything to depend on the
8165 : * default.
8166 : *
8167 : * We treat removing the existing default as an internal operation when it
8168 : * is preparatory to adding a new default, but as a user-initiated
8169 : * operation when the user asked for a drop.
8170 : */
8171 524 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8172 : newDefault != NULL);
8173 :
8174 524 : if (newDefault)
8175 : {
8176 : /* SET DEFAULT */
8177 : RawColumnDefault *rawEnt;
8178 :
8179 350 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
8180 350 : rawEnt->attnum = attnum;
8181 350 : rawEnt->raw_default = newDefault;
8182 350 : rawEnt->generated = '\0';
8183 :
8184 : /*
8185 : * This function is intended for CREATE TABLE, so it processes a
8186 : * _list_ of defaults, but we just do one.
8187 : */
8188 350 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8189 : false, true, false, NULL);
8190 : }
8191 :
8192 518 : ObjectAddressSubSet(address, RelationRelationId,
8193 : RelationGetRelid(rel), attnum);
8194 518 : return address;
8195 : }
8196 :
8197 : /*
8198 : * Add a pre-cooked default expression.
8199 : *
8200 : * Return the address of the affected column.
8201 : */
8202 : static ObjectAddress
8203 80 : ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
8204 : Node *newDefault)
8205 : {
8206 : ObjectAddress address;
8207 :
8208 : /* We assume no checking is required */
8209 :
8210 : /*
8211 : * Remove any old default for the column. We use RESTRICT here for
8212 : * safety, but at present we do not expect anything to depend on the
8213 : * default. (In ordinary cases, there could not be a default in place
8214 : * anyway, but it's possible when combining LIKE with inheritance.)
8215 : */
8216 80 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8217 : true);
8218 :
8219 80 : (void) StoreAttrDefault(rel, attnum, newDefault, true);
8220 :
8221 80 : ObjectAddressSubSet(address, RelationRelationId,
8222 : RelationGetRelid(rel), attnum);
8223 80 : return address;
8224 : }
8225 :
8226 : /*
8227 : * ALTER TABLE ALTER COLUMN ADD IDENTITY
8228 : *
8229 : * Return the address of the affected column.
8230 : */
8231 : static ObjectAddress
8232 160 : ATExecAddIdentity(Relation rel, const char *colName,
8233 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing)
8234 : {
8235 : Relation attrelation;
8236 : HeapTuple tuple;
8237 : Form_pg_attribute attTup;
8238 : AttrNumber attnum;
8239 : ObjectAddress address;
8240 160 : ColumnDef *cdef = castNode(ColumnDef, def);
8241 : bool ispartitioned;
8242 :
8243 160 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8244 160 : if (ispartitioned && !recurse)
8245 6 : ereport(ERROR,
8246 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8247 : errmsg("cannot add identity to a column of only the partitioned table"),
8248 : errhint("Do not specify the ONLY keyword.")));
8249 :
8250 154 : if (rel->rd_rel->relispartition && !recursing)
8251 12 : ereport(ERROR,
8252 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8253 : errmsg("cannot add identity to a column of a partition"));
8254 :
8255 142 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8256 :
8257 142 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8258 142 : if (!HeapTupleIsValid(tuple))
8259 0 : ereport(ERROR,
8260 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8261 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8262 : colName, RelationGetRelationName(rel))));
8263 142 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8264 142 : attnum = attTup->attnum;
8265 :
8266 : /* Can't alter a system attribute */
8267 142 : if (attnum <= 0)
8268 0 : ereport(ERROR,
8269 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8270 : errmsg("cannot alter system column \"%s\"",
8271 : colName)));
8272 :
8273 : /*
8274 : * Creating a column as identity implies NOT NULL, so adding the identity
8275 : * to an existing column that is not NOT NULL would create a state that
8276 : * cannot be reproduced without contortions.
8277 : */
8278 142 : if (!attTup->attnotnull)
8279 6 : ereport(ERROR,
8280 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8281 : errmsg("column \"%s\" of relation \"%s\" must be declared NOT NULL before identity can be added",
8282 : colName, RelationGetRelationName(rel))));
8283 :
8284 136 : if (attTup->attidentity)
8285 18 : ereport(ERROR,
8286 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8287 : errmsg("column \"%s\" of relation \"%s\" is already an identity column",
8288 : colName, RelationGetRelationName(rel))));
8289 :
8290 118 : if (attTup->atthasdef)
8291 6 : ereport(ERROR,
8292 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8293 : errmsg("column \"%s\" of relation \"%s\" already has a default value",
8294 : colName, RelationGetRelationName(rel))));
8295 :
8296 112 : attTup->attidentity = cdef->identity;
8297 112 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8298 :
8299 112 : InvokeObjectPostAlterHook(RelationRelationId,
8300 : RelationGetRelid(rel),
8301 : attTup->attnum);
8302 112 : ObjectAddressSubSet(address, RelationRelationId,
8303 : RelationGetRelid(rel), attnum);
8304 112 : heap_freetuple(tuple);
8305 :
8306 112 : table_close(attrelation, RowExclusiveLock);
8307 :
8308 : /*
8309 : * Recurse to propagate the identity column to partitions. Identity is
8310 : * not inherited in regular inheritance children.
8311 : */
8312 112 : if (recurse && ispartitioned)
8313 : {
8314 : List *children;
8315 : ListCell *lc;
8316 :
8317 10 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8318 :
8319 16 : foreach(lc, children)
8320 : {
8321 : Relation childrel;
8322 :
8323 6 : childrel = table_open(lfirst_oid(lc), NoLock);
8324 6 : ATExecAddIdentity(childrel, colName, def, lockmode, recurse, true);
8325 6 : table_close(childrel, NoLock);
8326 : }
8327 : }
8328 :
8329 112 : return address;
8330 : }
8331 :
8332 : /*
8333 : * ALTER TABLE ALTER COLUMN SET { GENERATED or sequence options }
8334 : *
8335 : * Return the address of the affected column.
8336 : */
8337 : static ObjectAddress
8338 74 : ATExecSetIdentity(Relation rel, const char *colName, Node *def,
8339 : LOCKMODE lockmode, bool recurse, bool recursing)
8340 : {
8341 : ListCell *option;
8342 74 : DefElem *generatedEl = NULL;
8343 : HeapTuple tuple;
8344 : Form_pg_attribute attTup;
8345 : AttrNumber attnum;
8346 : Relation attrelation;
8347 : ObjectAddress address;
8348 : bool ispartitioned;
8349 :
8350 74 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8351 74 : if (ispartitioned && !recurse)
8352 6 : ereport(ERROR,
8353 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8354 : errmsg("cannot change identity column of only the partitioned table"),
8355 : errhint("Do not specify the ONLY keyword.")));
8356 :
8357 68 : if (rel->rd_rel->relispartition && !recursing)
8358 12 : ereport(ERROR,
8359 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8360 : errmsg("cannot change identity column of a partition"));
8361 :
8362 100 : foreach(option, castNode(List, def))
8363 : {
8364 44 : DefElem *defel = lfirst_node(DefElem, option);
8365 :
8366 44 : if (strcmp(defel->defname, "generated") == 0)
8367 : {
8368 44 : if (generatedEl)
8369 0 : ereport(ERROR,
8370 : (errcode(ERRCODE_SYNTAX_ERROR),
8371 : errmsg("conflicting or redundant options")));
8372 44 : generatedEl = defel;
8373 : }
8374 : else
8375 0 : elog(ERROR, "option \"%s\" not recognized",
8376 : defel->defname);
8377 : }
8378 :
8379 : /*
8380 : * Even if there is nothing to change here, we run all the checks. There
8381 : * will be a subsequent ALTER SEQUENCE that relies on everything being
8382 : * there.
8383 : */
8384 :
8385 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8386 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8387 56 : if (!HeapTupleIsValid(tuple))
8388 0 : ereport(ERROR,
8389 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8390 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8391 : colName, RelationGetRelationName(rel))));
8392 :
8393 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8394 56 : attnum = attTup->attnum;
8395 :
8396 56 : if (attnum <= 0)
8397 0 : ereport(ERROR,
8398 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8399 : errmsg("cannot alter system column \"%s\"",
8400 : colName)));
8401 :
8402 56 : if (!attTup->attidentity)
8403 6 : ereport(ERROR,
8404 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8405 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8406 : colName, RelationGetRelationName(rel))));
8407 :
8408 50 : if (generatedEl)
8409 : {
8410 44 : attTup->attidentity = defGetInt32(generatedEl);
8411 44 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8412 :
8413 44 : InvokeObjectPostAlterHook(RelationRelationId,
8414 : RelationGetRelid(rel),
8415 : attTup->attnum);
8416 44 : ObjectAddressSubSet(address, RelationRelationId,
8417 : RelationGetRelid(rel), attnum);
8418 : }
8419 : else
8420 6 : address = InvalidObjectAddress;
8421 :
8422 50 : heap_freetuple(tuple);
8423 50 : table_close(attrelation, RowExclusiveLock);
8424 :
8425 : /*
8426 : * Recurse to propagate the identity change to partitions. Identity is not
8427 : * inherited in regular inheritance children.
8428 : */
8429 50 : if (generatedEl && recurse && ispartitioned)
8430 : {
8431 : List *children;
8432 : ListCell *lc;
8433 :
8434 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8435 :
8436 18 : foreach(lc, children)
8437 : {
8438 : Relation childrel;
8439 :
8440 12 : childrel = table_open(lfirst_oid(lc), NoLock);
8441 12 : ATExecSetIdentity(childrel, colName, def, lockmode, recurse, true);
8442 12 : table_close(childrel, NoLock);
8443 : }
8444 : }
8445 :
8446 50 : return address;
8447 : }
8448 :
8449 : /*
8450 : * ALTER TABLE ALTER COLUMN DROP IDENTITY
8451 : *
8452 : * Return the address of the affected column.
8453 : */
8454 : static ObjectAddress
8455 68 : ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
8456 : bool recurse, bool recursing)
8457 : {
8458 : HeapTuple tuple;
8459 : Form_pg_attribute attTup;
8460 : AttrNumber attnum;
8461 : Relation attrelation;
8462 : ObjectAddress address;
8463 : Oid seqid;
8464 : ObjectAddress seqaddress;
8465 : bool ispartitioned;
8466 :
8467 68 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8468 68 : if (ispartitioned && !recurse)
8469 6 : ereport(ERROR,
8470 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8471 : errmsg("cannot drop identity from a column of only the partitioned table"),
8472 : errhint("Do not specify the ONLY keyword.")));
8473 :
8474 62 : if (rel->rd_rel->relispartition && !recursing)
8475 6 : ereport(ERROR,
8476 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8477 : errmsg("cannot drop identity from a column of a partition"));
8478 :
8479 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8480 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8481 56 : if (!HeapTupleIsValid(tuple))
8482 0 : ereport(ERROR,
8483 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8484 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8485 : colName, RelationGetRelationName(rel))));
8486 :
8487 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8488 56 : attnum = attTup->attnum;
8489 :
8490 56 : if (attnum <= 0)
8491 0 : ereport(ERROR,
8492 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8493 : errmsg("cannot alter system column \"%s\"",
8494 : colName)));
8495 :
8496 56 : if (!attTup->attidentity)
8497 : {
8498 12 : if (!missing_ok)
8499 6 : ereport(ERROR,
8500 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8501 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8502 : colName, RelationGetRelationName(rel))));
8503 : else
8504 : {
8505 6 : ereport(NOTICE,
8506 : (errmsg("column \"%s\" of relation \"%s\" is not an identity column, skipping",
8507 : colName, RelationGetRelationName(rel))));
8508 6 : heap_freetuple(tuple);
8509 6 : table_close(attrelation, RowExclusiveLock);
8510 6 : return InvalidObjectAddress;
8511 : }
8512 : }
8513 :
8514 44 : attTup->attidentity = '\0';
8515 44 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8516 :
8517 44 : InvokeObjectPostAlterHook(RelationRelationId,
8518 : RelationGetRelid(rel),
8519 : attTup->attnum);
8520 44 : ObjectAddressSubSet(address, RelationRelationId,
8521 : RelationGetRelid(rel), attnum);
8522 44 : heap_freetuple(tuple);
8523 :
8524 44 : table_close(attrelation, RowExclusiveLock);
8525 :
8526 : /*
8527 : * Recurse to drop the identity from column in partitions. Identity is
8528 : * not inherited in regular inheritance children so ignore them.
8529 : */
8530 44 : if (recurse && ispartitioned)
8531 : {
8532 : List *children;
8533 : ListCell *lc;
8534 :
8535 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8536 :
8537 12 : foreach(lc, children)
8538 : {
8539 : Relation childrel;
8540 :
8541 6 : childrel = table_open(lfirst_oid(lc), NoLock);
8542 6 : ATExecDropIdentity(childrel, colName, false, lockmode, recurse, true);
8543 6 : table_close(childrel, NoLock);
8544 : }
8545 : }
8546 :
8547 44 : if (!recursing)
8548 : {
8549 : /* drop the internal sequence */
8550 32 : seqid = getIdentitySequence(rel, attnum, false);
8551 32 : deleteDependencyRecordsForClass(RelationRelationId, seqid,
8552 : RelationRelationId, DEPENDENCY_INTERNAL);
8553 32 : CommandCounterIncrement();
8554 32 : seqaddress.classId = RelationRelationId;
8555 32 : seqaddress.objectId = seqid;
8556 32 : seqaddress.objectSubId = 0;
8557 32 : performDeletion(&seqaddress, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
8558 : }
8559 :
8560 44 : return address;
8561 : }
8562 :
8563 : /*
8564 : * ALTER TABLE ALTER COLUMN SET EXPRESSION
8565 : *
8566 : * Return the address of the affected column.
8567 : */
8568 : static ObjectAddress
8569 216 : ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
8570 : Node *newExpr, LOCKMODE lockmode)
8571 : {
8572 : HeapTuple tuple;
8573 : Form_pg_attribute attTup;
8574 : AttrNumber attnum;
8575 : char attgenerated;
8576 : bool rewrite;
8577 : Oid attrdefoid;
8578 : ObjectAddress address;
8579 : Expr *defval;
8580 : NewColumnValue *newval;
8581 : RawColumnDefault *rawEnt;
8582 :
8583 216 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8584 216 : if (!HeapTupleIsValid(tuple))
8585 0 : ereport(ERROR,
8586 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8587 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8588 : colName, RelationGetRelationName(rel))));
8589 :
8590 216 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8591 :
8592 216 : attnum = attTup->attnum;
8593 216 : if (attnum <= 0)
8594 0 : ereport(ERROR,
8595 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8596 : errmsg("cannot alter system column \"%s\"",
8597 : colName)));
8598 :
8599 216 : attgenerated = attTup->attgenerated;
8600 216 : if (!attgenerated)
8601 12 : ereport(ERROR,
8602 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8603 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8604 : colName, RelationGetRelationName(rel))));
8605 :
8606 : /*
8607 : * TODO: This could be done, just need to recheck any constraints
8608 : * afterwards.
8609 : */
8610 204 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8611 108 : rel->rd_att->constr && rel->rd_att->constr->num_check > 0)
8612 12 : ereport(ERROR,
8613 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8614 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns in tables with check constraints"),
8615 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8616 : colName, RelationGetRelationName(rel))));
8617 :
8618 192 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL && attTup->attnotnull)
8619 24 : tab->verify_new_notnull = true;
8620 :
8621 : /*
8622 : * We need to prevent this because a change of expression could affect a
8623 : * row filter and inject expressions that are not permitted in a row
8624 : * filter. XXX We could try to have a more precise check to catch only
8625 : * publications with row filters, or even re-verify the row filter
8626 : * expressions.
8627 : */
8628 288 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8629 96 : GetRelationPublications(RelationGetRelid(rel)) != NIL)
8630 6 : ereport(ERROR,
8631 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8632 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns in tables that are part of a publication"),
8633 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8634 : colName, RelationGetRelationName(rel))));
8635 :
8636 186 : rewrite = (attgenerated == ATTRIBUTE_GENERATED_STORED);
8637 :
8638 186 : ReleaseSysCache(tuple);
8639 :
8640 186 : if (rewrite)
8641 : {
8642 : /*
8643 : * Clear all the missing values if we're rewriting the table, since
8644 : * this renders them pointless.
8645 : */
8646 96 : RelationClearMissing(rel);
8647 :
8648 : /* make sure we don't conflict with later attribute modifications */
8649 96 : CommandCounterIncrement();
8650 :
8651 : /*
8652 : * Find everything that depends on the column (constraints, indexes,
8653 : * etc), and record enough information to let us recreate the objects
8654 : * after rewrite.
8655 : */
8656 96 : RememberAllDependentForRebuilding(tab, AT_SetExpression, rel, attnum, colName);
8657 : }
8658 :
8659 : /*
8660 : * Drop the dependency records of the GENERATED expression, in particular
8661 : * its INTERNAL dependency on the column, which would otherwise cause
8662 : * dependency.c to refuse to perform the deletion.
8663 : */
8664 186 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8665 186 : if (!OidIsValid(attrdefoid))
8666 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8667 : RelationGetRelid(rel), attnum);
8668 186 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8669 :
8670 : /* Make above changes visible */
8671 186 : CommandCounterIncrement();
8672 :
8673 : /*
8674 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8675 : * safety, but at present we do not expect anything to depend on the
8676 : * expression.
8677 : */
8678 186 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8679 : false, false);
8680 :
8681 : /* Prepare to store the new expression, in the catalogs */
8682 186 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
8683 186 : rawEnt->attnum = attnum;
8684 186 : rawEnt->raw_default = newExpr;
8685 186 : rawEnt->generated = attgenerated;
8686 :
8687 : /* Store the generated expression */
8688 186 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8689 : false, true, false, NULL);
8690 :
8691 : /* Make above new expression visible */
8692 186 : CommandCounterIncrement();
8693 :
8694 186 : if (rewrite)
8695 : {
8696 : /* Prepare for table rewrite */
8697 96 : defval = (Expr *) build_column_default(rel, attnum);
8698 :
8699 96 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
8700 96 : newval->attnum = attnum;
8701 96 : newval->expr = expression_planner(defval);
8702 96 : newval->is_generated = true;
8703 :
8704 96 : tab->newvals = lappend(tab->newvals, newval);
8705 96 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
8706 : }
8707 :
8708 : /* Drop any pg_statistic entry for the column */
8709 186 : RemoveStatistics(RelationGetRelid(rel), attnum);
8710 :
8711 186 : InvokeObjectPostAlterHook(RelationRelationId,
8712 : RelationGetRelid(rel), attnum);
8713 :
8714 186 : ObjectAddressSubSet(address, RelationRelationId,
8715 : RelationGetRelid(rel), attnum);
8716 186 : return address;
8717 : }
8718 :
8719 : /*
8720 : * ALTER TABLE ALTER COLUMN DROP EXPRESSION
8721 : */
8722 : static void
8723 86 : ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode)
8724 : {
8725 : /*
8726 : * Reject ONLY if there are child tables. We could implement this, but it
8727 : * is a bit complicated. GENERATED clauses must be attached to the column
8728 : * definition and cannot be added later like DEFAULT, so if a child table
8729 : * has a generation expression that the parent does not have, the child
8730 : * column will necessarily be an attislocal column. So to implement ONLY
8731 : * here, we'd need extra code to update attislocal of the direct child
8732 : * tables, somewhat similar to how DROP COLUMN does it, so that the
8733 : * resulting state can be properly dumped and restored.
8734 : */
8735 110 : if (!recurse &&
8736 24 : find_inheritance_children(RelationGetRelid(rel), lockmode))
8737 12 : ereport(ERROR,
8738 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8739 : errmsg("ALTER TABLE / DROP EXPRESSION must be applied to child tables too")));
8740 :
8741 : /*
8742 : * Cannot drop generation expression from inherited columns.
8743 : */
8744 74 : if (!recursing)
8745 : {
8746 : HeapTuple tuple;
8747 : Form_pg_attribute attTup;
8748 :
8749 62 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), cmd->name);
8750 62 : if (!HeapTupleIsValid(tuple))
8751 0 : ereport(ERROR,
8752 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8753 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8754 : cmd->name, RelationGetRelationName(rel))));
8755 :
8756 62 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8757 :
8758 62 : if (attTup->attinhcount > 0)
8759 12 : ereport(ERROR,
8760 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8761 : errmsg("cannot drop generation expression from inherited column")));
8762 : }
8763 62 : }
8764 :
8765 : /*
8766 : * Return the address of the affected column.
8767 : */
8768 : static ObjectAddress
8769 56 : ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode)
8770 : {
8771 : HeapTuple tuple;
8772 : Form_pg_attribute attTup;
8773 : AttrNumber attnum;
8774 : Relation attrelation;
8775 : Oid attrdefoid;
8776 : ObjectAddress address;
8777 :
8778 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8779 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8780 56 : if (!HeapTupleIsValid(tuple))
8781 0 : ereport(ERROR,
8782 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8783 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8784 : colName, RelationGetRelationName(rel))));
8785 :
8786 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8787 56 : attnum = attTup->attnum;
8788 :
8789 56 : if (attnum <= 0)
8790 0 : ereport(ERROR,
8791 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8792 : errmsg("cannot alter system column \"%s\"",
8793 : colName)));
8794 :
8795 : /*
8796 : * TODO: This could be done, but it would need a table rewrite to
8797 : * materialize the generated values. Note that for the time being, we
8798 : * still error with missing_ok, so that we don't silently leave the column
8799 : * as generated.
8800 : */
8801 56 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8802 12 : ereport(ERROR,
8803 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8804 : errmsg("ALTER TABLE / DROP EXPRESSION is not supported for virtual generated columns"),
8805 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8806 : colName, RelationGetRelationName(rel))));
8807 :
8808 44 : if (!attTup->attgenerated)
8809 : {
8810 24 : if (!missing_ok)
8811 12 : ereport(ERROR,
8812 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8813 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8814 : colName, RelationGetRelationName(rel))));
8815 : else
8816 : {
8817 12 : ereport(NOTICE,
8818 : (errmsg("column \"%s\" of relation \"%s\" is not a generated column, skipping",
8819 : colName, RelationGetRelationName(rel))));
8820 12 : heap_freetuple(tuple);
8821 12 : table_close(attrelation, RowExclusiveLock);
8822 12 : return InvalidObjectAddress;
8823 : }
8824 : }
8825 :
8826 : /*
8827 : * Mark the column as no longer generated. (The atthasdef flag needs to
8828 : * get cleared too, but RemoveAttrDefault will handle that.)
8829 : */
8830 20 : attTup->attgenerated = '\0';
8831 20 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8832 :
8833 20 : InvokeObjectPostAlterHook(RelationRelationId,
8834 : RelationGetRelid(rel),
8835 : attnum);
8836 20 : heap_freetuple(tuple);
8837 :
8838 20 : table_close(attrelation, RowExclusiveLock);
8839 :
8840 : /*
8841 : * Drop the dependency records of the GENERATED expression, in particular
8842 : * its INTERNAL dependency on the column, which would otherwise cause
8843 : * dependency.c to refuse to perform the deletion.
8844 : */
8845 20 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8846 20 : if (!OidIsValid(attrdefoid))
8847 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8848 : RelationGetRelid(rel), attnum);
8849 20 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8850 :
8851 : /* Make above changes visible */
8852 20 : CommandCounterIncrement();
8853 :
8854 : /*
8855 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8856 : * safety, but at present we do not expect anything to depend on the
8857 : * default.
8858 : */
8859 20 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8860 : false, false);
8861 :
8862 20 : ObjectAddressSubSet(address, RelationRelationId,
8863 : RelationGetRelid(rel), attnum);
8864 20 : return address;
8865 : }
8866 :
8867 : /*
8868 : * ALTER TABLE ALTER COLUMN SET STATISTICS
8869 : *
8870 : * Return value is the address of the modified column
8871 : */
8872 : static ObjectAddress
8873 164 : ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
8874 : {
8875 164 : int newtarget = 0;
8876 : bool newtarget_default;
8877 : Relation attrelation;
8878 : HeapTuple tuple,
8879 : newtuple;
8880 : Form_pg_attribute attrtuple;
8881 : AttrNumber attnum;
8882 : ObjectAddress address;
8883 : Datum repl_val[Natts_pg_attribute];
8884 : bool repl_null[Natts_pg_attribute];
8885 : bool repl_repl[Natts_pg_attribute];
8886 :
8887 : /*
8888 : * We allow referencing columns by numbers only for indexes, since table
8889 : * column numbers could contain gaps if columns are later dropped.
8890 : */
8891 164 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
8892 100 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
8893 : !colName)
8894 0 : ereport(ERROR,
8895 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8896 : errmsg("cannot refer to non-index column by number")));
8897 :
8898 : /* -1 was used in previous versions for the default setting */
8899 164 : if (newValue && intVal(newValue) != -1)
8900 : {
8901 120 : newtarget = intVal(newValue);
8902 120 : newtarget_default = false;
8903 : }
8904 : else
8905 44 : newtarget_default = true;
8906 :
8907 164 : if (!newtarget_default)
8908 : {
8909 : /*
8910 : * Limit target to a sane range
8911 : */
8912 120 : if (newtarget < 0)
8913 : {
8914 0 : ereport(ERROR,
8915 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
8916 : errmsg("statistics target %d is too low",
8917 : newtarget)));
8918 : }
8919 120 : else if (newtarget > MAX_STATISTICS_TARGET)
8920 : {
8921 0 : newtarget = MAX_STATISTICS_TARGET;
8922 0 : ereport(WARNING,
8923 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
8924 : errmsg("lowering statistics target to %d",
8925 : newtarget)));
8926 : }
8927 : }
8928 :
8929 164 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8930 :
8931 164 : if (colName)
8932 : {
8933 100 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8934 :
8935 100 : if (!HeapTupleIsValid(tuple))
8936 12 : ereport(ERROR,
8937 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8938 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8939 : colName, RelationGetRelationName(rel))));
8940 : }
8941 : else
8942 : {
8943 64 : tuple = SearchSysCacheAttNum(RelationGetRelid(rel), colNum);
8944 :
8945 64 : if (!HeapTupleIsValid(tuple))
8946 12 : ereport(ERROR,
8947 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8948 : errmsg("column number %d of relation \"%s\" does not exist",
8949 : colNum, RelationGetRelationName(rel))));
8950 : }
8951 :
8952 140 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
8953 :
8954 140 : attnum = attrtuple->attnum;
8955 140 : if (attnum <= 0)
8956 0 : ereport(ERROR,
8957 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8958 : errmsg("cannot alter system column \"%s\"",
8959 : colName)));
8960 :
8961 : /*
8962 : * Prevent this as long as the ANALYZE code skips virtual generated
8963 : * columns.
8964 : */
8965 140 : if (attrtuple->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8966 0 : ereport(ERROR,
8967 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8968 : errmsg("cannot alter statistics on virtual generated column \"%s\"",
8969 : colName)));
8970 :
8971 140 : if (rel->rd_rel->relkind == RELKIND_INDEX ||
8972 88 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
8973 : {
8974 52 : if (attnum > rel->rd_index->indnkeyatts)
8975 6 : ereport(ERROR,
8976 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8977 : errmsg("cannot alter statistics on included column \"%s\" of index \"%s\"",
8978 : NameStr(attrtuple->attname), RelationGetRelationName(rel))));
8979 46 : else if (rel->rd_index->indkey.values[attnum - 1] != 0)
8980 18 : ereport(ERROR,
8981 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8982 : errmsg("cannot alter statistics on non-expression column \"%s\" of index \"%s\"",
8983 : NameStr(attrtuple->attname), RelationGetRelationName(rel)),
8984 : errhint("Alter statistics on table column instead.")));
8985 : }
8986 :
8987 : /* Build new tuple. */
8988 116 : memset(repl_null, false, sizeof(repl_null));
8989 116 : memset(repl_repl, false, sizeof(repl_repl));
8990 116 : if (!newtarget_default)
8991 72 : repl_val[Anum_pg_attribute_attstattarget - 1] = Int16GetDatum(newtarget);
8992 : else
8993 44 : repl_null[Anum_pg_attribute_attstattarget - 1] = true;
8994 116 : repl_repl[Anum_pg_attribute_attstattarget - 1] = true;
8995 116 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
8996 : repl_val, repl_null, repl_repl);
8997 116 : CatalogTupleUpdate(attrelation, &tuple->t_self, newtuple);
8998 :
8999 116 : InvokeObjectPostAlterHook(RelationRelationId,
9000 : RelationGetRelid(rel),
9001 : attrtuple->attnum);
9002 116 : ObjectAddressSubSet(address, RelationRelationId,
9003 : RelationGetRelid(rel), attnum);
9004 :
9005 116 : heap_freetuple(newtuple);
9006 :
9007 116 : ReleaseSysCache(tuple);
9008 :
9009 116 : table_close(attrelation, RowExclusiveLock);
9010 :
9011 116 : return address;
9012 : }
9013 :
9014 : /*
9015 : * Return value is the address of the modified column
9016 : */
9017 : static ObjectAddress
9018 32 : ATExecSetOptions(Relation rel, const char *colName, Node *options,
9019 : bool isReset, LOCKMODE lockmode)
9020 : {
9021 : Relation attrelation;
9022 : HeapTuple tuple,
9023 : newtuple;
9024 : Form_pg_attribute attrtuple;
9025 : AttrNumber attnum;
9026 : Datum datum,
9027 : newOptions;
9028 : bool isnull;
9029 : ObjectAddress address;
9030 : Datum repl_val[Natts_pg_attribute];
9031 : bool repl_null[Natts_pg_attribute];
9032 : bool repl_repl[Natts_pg_attribute];
9033 :
9034 32 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9035 :
9036 32 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9037 :
9038 32 : if (!HeapTupleIsValid(tuple))
9039 0 : ereport(ERROR,
9040 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9041 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9042 : colName, RelationGetRelationName(rel))));
9043 32 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9044 :
9045 32 : attnum = attrtuple->attnum;
9046 32 : if (attnum <= 0)
9047 0 : ereport(ERROR,
9048 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9049 : errmsg("cannot alter system column \"%s\"",
9050 : colName)));
9051 :
9052 : /* Generate new proposed attoptions (text array) */
9053 32 : datum = SysCacheGetAttr(ATTNAME, tuple, Anum_pg_attribute_attoptions,
9054 : &isnull);
9055 32 : newOptions = transformRelOptions(isnull ? (Datum) 0 : datum,
9056 : castNode(List, options), NULL, NULL,
9057 : false, isReset);
9058 : /* Validate new options */
9059 32 : (void) attribute_reloptions(newOptions, true);
9060 :
9061 : /* Build new tuple. */
9062 32 : memset(repl_null, false, sizeof(repl_null));
9063 32 : memset(repl_repl, false, sizeof(repl_repl));
9064 32 : if (newOptions != (Datum) 0)
9065 32 : repl_val[Anum_pg_attribute_attoptions - 1] = newOptions;
9066 : else
9067 0 : repl_null[Anum_pg_attribute_attoptions - 1] = true;
9068 32 : repl_repl[Anum_pg_attribute_attoptions - 1] = true;
9069 32 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9070 : repl_val, repl_null, repl_repl);
9071 :
9072 : /* Update system catalog. */
9073 32 : CatalogTupleUpdate(attrelation, &newtuple->t_self, newtuple);
9074 :
9075 32 : InvokeObjectPostAlterHook(RelationRelationId,
9076 : RelationGetRelid(rel),
9077 : attrtuple->attnum);
9078 32 : ObjectAddressSubSet(address, RelationRelationId,
9079 : RelationGetRelid(rel), attnum);
9080 :
9081 32 : heap_freetuple(newtuple);
9082 :
9083 32 : ReleaseSysCache(tuple);
9084 :
9085 32 : table_close(attrelation, RowExclusiveLock);
9086 :
9087 32 : return address;
9088 : }
9089 :
9090 : /*
9091 : * Helper function for ATExecSetStorage and ATExecSetCompression
9092 : *
9093 : * Set the attstorage and/or attcompression fields for index columns
9094 : * associated with the specified table column.
9095 : */
9096 : static void
9097 320 : SetIndexStorageProperties(Relation rel, Relation attrelation,
9098 : AttrNumber attnum,
9099 : bool setstorage, char newstorage,
9100 : bool setcompression, char newcompression,
9101 : LOCKMODE lockmode)
9102 : {
9103 : ListCell *lc;
9104 :
9105 412 : foreach(lc, RelationGetIndexList(rel))
9106 : {
9107 92 : Oid indexoid = lfirst_oid(lc);
9108 : Relation indrel;
9109 92 : AttrNumber indattnum = 0;
9110 : HeapTuple tuple;
9111 :
9112 92 : indrel = index_open(indexoid, lockmode);
9113 :
9114 154 : for (int i = 0; i < indrel->rd_index->indnatts; i++)
9115 : {
9116 98 : if (indrel->rd_index->indkey.values[i] == attnum)
9117 : {
9118 36 : indattnum = i + 1;
9119 36 : break;
9120 : }
9121 : }
9122 :
9123 92 : if (indattnum == 0)
9124 : {
9125 56 : index_close(indrel, lockmode);
9126 56 : continue;
9127 : }
9128 :
9129 36 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(indrel), indattnum);
9130 :
9131 36 : if (HeapTupleIsValid(tuple))
9132 : {
9133 36 : Form_pg_attribute attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9134 :
9135 36 : if (setstorage)
9136 24 : attrtuple->attstorage = newstorage;
9137 :
9138 36 : if (setcompression)
9139 12 : attrtuple->attcompression = newcompression;
9140 :
9141 36 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9142 :
9143 36 : InvokeObjectPostAlterHook(RelationRelationId,
9144 : RelationGetRelid(rel),
9145 : attrtuple->attnum);
9146 :
9147 36 : heap_freetuple(tuple);
9148 : }
9149 :
9150 36 : index_close(indrel, lockmode);
9151 : }
9152 320 : }
9153 :
9154 : /*
9155 : * ALTER TABLE ALTER COLUMN SET STORAGE
9156 : *
9157 : * Return value is the address of the modified column
9158 : */
9159 : static ObjectAddress
9160 260 : ATExecSetStorage(Relation rel, const char *colName, Node *newValue, LOCKMODE lockmode)
9161 : {
9162 : Relation attrelation;
9163 : HeapTuple tuple;
9164 : Form_pg_attribute attrtuple;
9165 : AttrNumber attnum;
9166 : ObjectAddress address;
9167 :
9168 260 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9169 :
9170 260 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
9171 :
9172 260 : if (!HeapTupleIsValid(tuple))
9173 12 : ereport(ERROR,
9174 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9175 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9176 : colName, RelationGetRelationName(rel))));
9177 248 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9178 :
9179 248 : attnum = attrtuple->attnum;
9180 248 : if (attnum <= 0)
9181 0 : ereport(ERROR,
9182 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9183 : errmsg("cannot alter system column \"%s\"",
9184 : colName)));
9185 :
9186 248 : attrtuple->attstorage = GetAttributeStorage(attrtuple->atttypid, strVal(newValue));
9187 :
9188 248 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9189 :
9190 248 : InvokeObjectPostAlterHook(RelationRelationId,
9191 : RelationGetRelid(rel),
9192 : attrtuple->attnum);
9193 :
9194 : /*
9195 : * Apply the change to indexes as well (only for simple index columns,
9196 : * matching behavior of index.c ConstructTupleDescriptor()).
9197 : */
9198 248 : SetIndexStorageProperties(rel, attrelation, attnum,
9199 248 : true, attrtuple->attstorage,
9200 : false, 0,
9201 : lockmode);
9202 :
9203 248 : heap_freetuple(tuple);
9204 :
9205 248 : table_close(attrelation, RowExclusiveLock);
9206 :
9207 248 : ObjectAddressSubSet(address, RelationRelationId,
9208 : RelationGetRelid(rel), attnum);
9209 248 : return address;
9210 : }
9211 :
9212 :
9213 : /*
9214 : * ALTER TABLE DROP COLUMN
9215 : *
9216 : * DROP COLUMN cannot use the normal ALTER TABLE recursion mechanism,
9217 : * because we have to decide at runtime whether to recurse or not depending
9218 : * on whether attinhcount goes to zero or not. (We can't check this in a
9219 : * static pre-pass because it won't handle multiple inheritance situations
9220 : * correctly.)
9221 : */
9222 : static void
9223 1658 : ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
9224 : AlterTableCmd *cmd, LOCKMODE lockmode,
9225 : AlterTableUtilityContext *context)
9226 : {
9227 1658 : if (rel->rd_rel->reloftype && !recursing)
9228 6 : ereport(ERROR,
9229 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
9230 : errmsg("cannot drop column from typed table")));
9231 :
9232 1652 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
9233 84 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
9234 :
9235 1646 : if (recurse)
9236 1366 : cmd->recurse = true;
9237 1646 : }
9238 :
9239 : /*
9240 : * Drops column 'colName' from relation 'rel' and returns the address of the
9241 : * dropped column. The column is also dropped (or marked as no longer
9242 : * inherited from relation) from the relation's inheritance children, if any.
9243 : *
9244 : * In the recursive invocations for inheritance child relations, instead of
9245 : * dropping the column directly (if to be dropped at all), its object address
9246 : * is added to 'addrs', which must be non-NULL in such invocations. All
9247 : * columns are dropped at the same time after all the children have been
9248 : * checked recursively.
9249 : */
9250 : static ObjectAddress
9251 2208 : ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
9252 : DropBehavior behavior,
9253 : bool recurse, bool recursing,
9254 : bool missing_ok, LOCKMODE lockmode,
9255 : ObjectAddresses *addrs)
9256 : {
9257 : HeapTuple tuple;
9258 : Form_pg_attribute targetatt;
9259 : AttrNumber attnum;
9260 : List *children;
9261 : ObjectAddress object;
9262 : bool is_expr;
9263 :
9264 : /* At top level, permission check was done in ATPrepCmd, else do it */
9265 2208 : if (recursing)
9266 562 : ATSimplePermissions(AT_DropColumn, rel,
9267 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9268 :
9269 : /* Initialize addrs on the first invocation */
9270 : Assert(!recursing || addrs != NULL);
9271 :
9272 : /* since this function recurses, it could be driven to stack overflow */
9273 2208 : check_stack_depth();
9274 :
9275 2208 : if (!recursing)
9276 1646 : addrs = new_object_addresses();
9277 :
9278 : /*
9279 : * get the number of the attribute
9280 : */
9281 2208 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9282 2208 : if (!HeapTupleIsValid(tuple))
9283 : {
9284 54 : if (!missing_ok)
9285 : {
9286 36 : ereport(ERROR,
9287 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9288 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9289 : colName, RelationGetRelationName(rel))));
9290 : }
9291 : else
9292 : {
9293 18 : ereport(NOTICE,
9294 : (errmsg("column \"%s\" of relation \"%s\" does not exist, skipping",
9295 : colName, RelationGetRelationName(rel))));
9296 18 : return InvalidObjectAddress;
9297 : }
9298 : }
9299 2154 : targetatt = (Form_pg_attribute) GETSTRUCT(tuple);
9300 :
9301 2154 : attnum = targetatt->attnum;
9302 :
9303 : /* Can't drop a system attribute */
9304 2154 : if (attnum <= 0)
9305 6 : ereport(ERROR,
9306 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9307 : errmsg("cannot drop system column \"%s\"",
9308 : colName)));
9309 :
9310 : /*
9311 : * Don't drop inherited columns, unless recursing (presumably from a drop
9312 : * of the parent column)
9313 : */
9314 2148 : if (targetatt->attinhcount > 0 && !recursing)
9315 48 : ereport(ERROR,
9316 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9317 : errmsg("cannot drop inherited column \"%s\"",
9318 : colName)));
9319 :
9320 : /*
9321 : * Don't drop columns used in the partition key, either. (If we let this
9322 : * go through, the key column's dependencies would cause a cascaded drop
9323 : * of the whole table, which is surely not what the user expected.)
9324 : */
9325 2100 : if (has_partition_attrs(rel,
9326 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
9327 : &is_expr))
9328 30 : ereport(ERROR,
9329 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9330 : errmsg("cannot drop column \"%s\" because it is part of the partition key of relation \"%s\"",
9331 : colName, RelationGetRelationName(rel))));
9332 :
9333 2070 : ReleaseSysCache(tuple);
9334 :
9335 : /*
9336 : * Propagate to children as appropriate. Unlike most other ALTER
9337 : * routines, we have to do this one level of recursion at a time; we can't
9338 : * use find_all_inheritors to do it in one pass.
9339 : */
9340 : children =
9341 2070 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9342 :
9343 2070 : if (children)
9344 : {
9345 : Relation attr_rel;
9346 : ListCell *child;
9347 :
9348 : /*
9349 : * In case of a partitioned table, the column must be dropped from the
9350 : * partitions as well.
9351 : */
9352 308 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
9353 6 : ereport(ERROR,
9354 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9355 : errmsg("cannot drop column from only the partitioned table when partitions exist"),
9356 : errhint("Do not specify the ONLY keyword.")));
9357 :
9358 302 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
9359 894 : foreach(child, children)
9360 : {
9361 598 : Oid childrelid = lfirst_oid(child);
9362 : Relation childrel;
9363 : Form_pg_attribute childatt;
9364 :
9365 : /* find_inheritance_children already got lock */
9366 598 : childrel = table_open(childrelid, NoLock);
9367 598 : CheckAlterTableIsSafe(childrel);
9368 :
9369 598 : tuple = SearchSysCacheCopyAttName(childrelid, colName);
9370 598 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
9371 0 : elog(ERROR, "cache lookup failed for attribute \"%s\" of relation %u",
9372 : colName, childrelid);
9373 598 : childatt = (Form_pg_attribute) GETSTRUCT(tuple);
9374 :
9375 598 : if (childatt->attinhcount <= 0) /* shouldn't happen */
9376 0 : elog(ERROR, "relation %u has non-inherited attribute \"%s\"",
9377 : childrelid, colName);
9378 :
9379 598 : if (recurse)
9380 : {
9381 : /*
9382 : * If the child column has other definition sources, just
9383 : * decrement its inheritance count; if not, recurse to delete
9384 : * it.
9385 : */
9386 574 : if (childatt->attinhcount == 1 && !childatt->attislocal)
9387 : {
9388 : /* Time to delete this child column, too */
9389 562 : ATExecDropColumn(wqueue, childrel, colName,
9390 : behavior, true, true,
9391 : false, lockmode, addrs);
9392 : }
9393 : else
9394 : {
9395 : /* Child column must survive my deletion */
9396 12 : childatt->attinhcount--;
9397 :
9398 12 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9399 :
9400 : /* Make update visible */
9401 12 : CommandCounterIncrement();
9402 : }
9403 : }
9404 : else
9405 : {
9406 : /*
9407 : * If we were told to drop ONLY in this table (no recursion),
9408 : * we need to mark the inheritors' attributes as locally
9409 : * defined rather than inherited.
9410 : */
9411 24 : childatt->attinhcount--;
9412 24 : childatt->attislocal = true;
9413 :
9414 24 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9415 :
9416 : /* Make update visible */
9417 24 : CommandCounterIncrement();
9418 : }
9419 :
9420 592 : heap_freetuple(tuple);
9421 :
9422 592 : table_close(childrel, NoLock);
9423 : }
9424 296 : table_close(attr_rel, RowExclusiveLock);
9425 : }
9426 :
9427 : /* Add object to delete */
9428 2058 : object.classId = RelationRelationId;
9429 2058 : object.objectId = RelationGetRelid(rel);
9430 2058 : object.objectSubId = attnum;
9431 2058 : add_exact_object_address(&object, addrs);
9432 :
9433 2058 : if (!recursing)
9434 : {
9435 : /* Recursion has ended, drop everything that was collected */
9436 1502 : performMultipleDeletions(addrs, behavior, 0);
9437 1448 : free_object_addresses(addrs);
9438 : }
9439 :
9440 2004 : return object;
9441 : }
9442 :
9443 : /*
9444 : * Prepare to add a primary key on a table, by adding not-null constraints
9445 : * on all columns.
9446 : *
9447 : * The not-null constraints for a primary key must cover the whole inheritance
9448 : * hierarchy (failing to ensure that leads to funny corner cases). For the
9449 : * normal case where we're asked to recurse, this routine checks if the
9450 : * not-null constraints exist already, and if not queues a requirement for
9451 : * them to be created by phase 2.
9452 : *
9453 : * For the case where we're asked not to recurse, we verify that a not-null
9454 : * constraint exists on each column of each (direct) child table, throwing an
9455 : * error if not. Not throwing an error would also work, because a not-null
9456 : * constraint would be created anyway, but it'd cause a silent scan of the
9457 : * child table to verify absence of nulls. We prefer to let the user know so
9458 : * that they can add the constraint manually without having to hold
9459 : * AccessExclusiveLock while at it.
9460 : *
9461 : * However, it's also important that we do not acquire locks on children if
9462 : * the not-null constraints already exist on the parent, to avoid risking
9463 : * deadlocks during parallel pg_restore of PKs on partitioned tables.
9464 : */
9465 : static void
9466 16078 : ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
9467 : bool recurse, LOCKMODE lockmode,
9468 : AlterTableUtilityContext *context)
9469 : {
9470 : Constraint *pkconstr;
9471 16078 : List *children = NIL;
9472 16078 : bool got_children = false;
9473 :
9474 16078 : pkconstr = castNode(Constraint, cmd->def);
9475 16078 : if (pkconstr->contype != CONSTR_PRIMARY)
9476 9224 : return;
9477 :
9478 : /* Verify that columns are not-null, or request that they be made so */
9479 14676 : foreach_node(String, column, pkconstr->keys)
9480 : {
9481 : AlterTableCmd *newcmd;
9482 : Constraint *nnconstr;
9483 : HeapTuple tuple;
9484 :
9485 : /*
9486 : * First check if a suitable constraint exists. If it does, we don't
9487 : * need to request another one. We do need to bail out if it's not
9488 : * valid, though.
9489 : */
9490 1028 : tuple = findNotNullConstraint(RelationGetRelid(rel), strVal(column));
9491 1028 : if (tuple != NULL)
9492 : {
9493 518 : verifyNotNullPKCompatible(tuple, strVal(column));
9494 :
9495 : /* All good with this one; don't request another */
9496 506 : heap_freetuple(tuple);
9497 506 : continue;
9498 : }
9499 510 : else if (!recurse)
9500 : {
9501 : /*
9502 : * No constraint on this column. Asked not to recurse, we won't
9503 : * create one here, but verify that all children have one.
9504 : */
9505 36 : if (!got_children)
9506 : {
9507 36 : children = find_inheritance_children(RelationGetRelid(rel),
9508 : lockmode);
9509 : /* only search for children on the first time through */
9510 36 : got_children = true;
9511 : }
9512 :
9513 72 : foreach_oid(childrelid, children)
9514 : {
9515 : HeapTuple tup;
9516 :
9517 36 : tup = findNotNullConstraint(childrelid, strVal(column));
9518 36 : if (!tup)
9519 6 : ereport(ERROR,
9520 : errmsg("column \"%s\" of table \"%s\" is not marked NOT NULL",
9521 : strVal(column), get_rel_name(childrelid)));
9522 : /* verify it's good enough */
9523 30 : verifyNotNullPKCompatible(tup, strVal(column));
9524 : }
9525 : }
9526 :
9527 : /* This column is not already not-null, so add it to the queue */
9528 492 : nnconstr = makeNotNullConstraint(column);
9529 :
9530 492 : newcmd = makeNode(AlterTableCmd);
9531 492 : newcmd->subtype = AT_AddConstraint;
9532 : /* note we force recurse=true here; see above */
9533 492 : newcmd->recurse = true;
9534 492 : newcmd->def = (Node *) nnconstr;
9535 :
9536 492 : ATPrepCmd(wqueue, rel, newcmd, true, false, lockmode, context);
9537 : }
9538 : }
9539 :
9540 : /*
9541 : * Verify whether the given not-null constraint is compatible with a
9542 : * primary key. If not, an error is thrown.
9543 : */
9544 : static void
9545 548 : verifyNotNullPKCompatible(HeapTuple tuple, const char *colname)
9546 : {
9547 548 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
9548 :
9549 548 : if (conForm->contype != CONSTRAINT_NOTNULL)
9550 0 : elog(ERROR, "constraint %u is not a not-null constraint", conForm->oid);
9551 :
9552 : /* a NO INHERIT constraint is no good */
9553 548 : if (conForm->connoinherit)
9554 12 : ereport(ERROR,
9555 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9556 : errmsg("cannot create primary key on column \"%s\"", colname),
9557 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9558 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9559 : NameStr(conForm->conname), colname,
9560 : get_rel_name(conForm->conrelid), "NO INHERIT"),
9561 : errhint("You might need to make the existing constraint inheritable using %s.",
9562 : "ALTER TABLE ... ALTER CONSTRAINT ... INHERIT"));
9563 :
9564 : /* an unvalidated constraint is no good */
9565 536 : if (!conForm->convalidated)
9566 12 : ereport(ERROR,
9567 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9568 : errmsg("cannot create primary key on column \"%s\"", colname),
9569 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9570 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9571 : NameStr(conForm->conname), colname,
9572 : get_rel_name(conForm->conrelid), "NOT VALID"),
9573 : errhint("You might need to validate it using %s.",
9574 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
9575 524 : }
9576 :
9577 : /*
9578 : * ALTER TABLE ADD INDEX
9579 : *
9580 : * There is no such command in the grammar, but parse_utilcmd.c converts
9581 : * UNIQUE and PRIMARY KEY constraints into AT_AddIndex subcommands. This lets
9582 : * us schedule creation of the index at the appropriate time during ALTER.
9583 : *
9584 : * Return value is the address of the new index.
9585 : */
9586 : static ObjectAddress
9587 1634 : ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
9588 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9589 : {
9590 : bool check_rights;
9591 : bool skip_build;
9592 : bool quiet;
9593 : ObjectAddress address;
9594 :
9595 : Assert(IsA(stmt, IndexStmt));
9596 : Assert(!stmt->concurrent);
9597 :
9598 : /* The IndexStmt has already been through transformIndexStmt */
9599 : Assert(stmt->transformed);
9600 :
9601 : /* suppress schema rights check when rebuilding existing index */
9602 1634 : check_rights = !is_rebuild;
9603 : /* skip index build if phase 3 will do it or we're reusing an old one */
9604 1634 : skip_build = tab->rewrite > 0 || RelFileNumberIsValid(stmt->oldNumber);
9605 : /* suppress notices when rebuilding existing index */
9606 1634 : quiet = is_rebuild;
9607 :
9608 1634 : address = DefineIndex(RelationGetRelid(rel),
9609 : stmt,
9610 : InvalidOid, /* no predefined OID */
9611 : InvalidOid, /* no parent index */
9612 : InvalidOid, /* no parent constraint */
9613 : -1, /* total_parts unknown */
9614 : true, /* is_alter_table */
9615 : check_rights,
9616 : false, /* check_not_in_use - we did it already */
9617 : skip_build,
9618 : quiet);
9619 :
9620 : /*
9621 : * If TryReuseIndex() stashed a relfilenumber for us, we used it for the
9622 : * new index instead of building from scratch. Restore associated fields.
9623 : * This may store InvalidSubTransactionId in both fields, in which case
9624 : * relcache.c will assume it can rebuild the relcache entry. Hence, do
9625 : * this after the CCI that made catalog rows visible to any rebuild. The
9626 : * DROP of the old edition of this index will have scheduled the storage
9627 : * for deletion at commit, so cancel that pending deletion.
9628 : */
9629 1464 : if (RelFileNumberIsValid(stmt->oldNumber))
9630 : {
9631 74 : Relation irel = index_open(address.objectId, NoLock);
9632 :
9633 74 : irel->rd_createSubid = stmt->oldCreateSubid;
9634 74 : irel->rd_firstRelfilelocatorSubid = stmt->oldFirstRelfilelocatorSubid;
9635 74 : RelationPreserveStorage(irel->rd_locator, true);
9636 74 : index_close(irel, NoLock);
9637 : }
9638 :
9639 1464 : return address;
9640 : }
9641 :
9642 : /*
9643 : * ALTER TABLE ADD STATISTICS
9644 : *
9645 : * This is no such command in the grammar, but we use this internally to add
9646 : * AT_ReAddStatistics subcommands to rebuild extended statistics after a table
9647 : * column type change.
9648 : */
9649 : static ObjectAddress
9650 26 : ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
9651 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9652 : {
9653 : ObjectAddress address;
9654 :
9655 : Assert(IsA(stmt, CreateStatsStmt));
9656 :
9657 : /* The CreateStatsStmt has already been through transformStatsStmt */
9658 : Assert(stmt->transformed);
9659 :
9660 26 : address = CreateStatistics(stmt);
9661 :
9662 26 : return address;
9663 : }
9664 :
9665 : /*
9666 : * ALTER TABLE ADD CONSTRAINT USING INDEX
9667 : *
9668 : * Returns the address of the new constraint.
9669 : */
9670 : static ObjectAddress
9671 10640 : ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
9672 : IndexStmt *stmt, LOCKMODE lockmode)
9673 : {
9674 10640 : Oid index_oid = stmt->indexOid;
9675 : Relation indexRel;
9676 : char *indexName;
9677 : IndexInfo *indexInfo;
9678 : char *constraintName;
9679 : char constraintType;
9680 : ObjectAddress address;
9681 : bits16 flags;
9682 :
9683 : Assert(IsA(stmt, IndexStmt));
9684 : Assert(OidIsValid(index_oid));
9685 : Assert(stmt->isconstraint);
9686 :
9687 : /*
9688 : * Doing this on partitioned tables is not a simple feature to implement,
9689 : * so let's punt for now.
9690 : */
9691 10640 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
9692 6 : ereport(ERROR,
9693 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9694 : errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX is not supported on partitioned tables")));
9695 :
9696 10634 : indexRel = index_open(index_oid, AccessShareLock);
9697 :
9698 10634 : indexName = pstrdup(RelationGetRelationName(indexRel));
9699 :
9700 10634 : indexInfo = BuildIndexInfo(indexRel);
9701 :
9702 : /* this should have been checked at parse time */
9703 10634 : if (!indexInfo->ii_Unique)
9704 0 : elog(ERROR, "index \"%s\" is not unique", indexName);
9705 :
9706 : /*
9707 : * Determine name to assign to constraint. We require a constraint to
9708 : * have the same name as the underlying index; therefore, use the index's
9709 : * existing name as the default constraint name, and if the user
9710 : * explicitly gives some other name for the constraint, rename the index
9711 : * to match.
9712 : */
9713 10634 : constraintName = stmt->idxname;
9714 10634 : if (constraintName == NULL)
9715 10608 : constraintName = indexName;
9716 26 : else if (strcmp(constraintName, indexName) != 0)
9717 : {
9718 20 : ereport(NOTICE,
9719 : (errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index \"%s\" to \"%s\"",
9720 : indexName, constraintName)));
9721 20 : RenameRelationInternal(index_oid, constraintName, false, true);
9722 : }
9723 :
9724 : /* Extra checks needed if making primary key */
9725 10634 : if (stmt->primary)
9726 6006 : index_check_primary_key(rel, indexInfo, true, stmt);
9727 :
9728 : /* Note we currently don't support EXCLUSION constraints here */
9729 10628 : if (stmt->primary)
9730 6000 : constraintType = CONSTRAINT_PRIMARY;
9731 : else
9732 4628 : constraintType = CONSTRAINT_UNIQUE;
9733 :
9734 : /* Create the catalog entries for the constraint */
9735 10628 : flags = INDEX_CONSTR_CREATE_UPDATE_INDEX |
9736 : INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS |
9737 21256 : (stmt->initdeferred ? INDEX_CONSTR_CREATE_INIT_DEFERRED : 0) |
9738 10628 : (stmt->deferrable ? INDEX_CONSTR_CREATE_DEFERRABLE : 0) |
9739 10628 : (stmt->primary ? INDEX_CONSTR_CREATE_MARK_AS_PRIMARY : 0);
9740 :
9741 10628 : address = index_constraint_create(rel,
9742 : index_oid,
9743 : InvalidOid,
9744 : indexInfo,
9745 : constraintName,
9746 : constraintType,
9747 : flags,
9748 : allowSystemTableMods,
9749 : false); /* is_internal */
9750 :
9751 10628 : index_close(indexRel, NoLock);
9752 :
9753 10628 : return address;
9754 : }
9755 :
9756 : /*
9757 : * ALTER TABLE ADD CONSTRAINT
9758 : *
9759 : * Return value is the address of the new constraint; if no constraint was
9760 : * added, InvalidObjectAddress is returned.
9761 : */
9762 : static ObjectAddress
9763 12848 : ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9764 : Constraint *newConstraint, bool recurse, bool is_readd,
9765 : LOCKMODE lockmode)
9766 : {
9767 12848 : ObjectAddress address = InvalidObjectAddress;
9768 :
9769 : Assert(IsA(newConstraint, Constraint));
9770 :
9771 : /*
9772 : * Currently, we only expect to see CONSTR_CHECK, CONSTR_NOTNULL and
9773 : * CONSTR_FOREIGN nodes arriving here (see the preprocessing done in
9774 : * parse_utilcmd.c).
9775 : */
9776 12848 : switch (newConstraint->contype)
9777 : {
9778 10176 : case CONSTR_CHECK:
9779 : case CONSTR_NOTNULL:
9780 : address =
9781 10176 : ATAddCheckNNConstraint(wqueue, tab, rel,
9782 : newConstraint, recurse, false, is_readd,
9783 : lockmode);
9784 10032 : break;
9785 :
9786 2672 : case CONSTR_FOREIGN:
9787 :
9788 : /*
9789 : * Assign or validate constraint name
9790 : */
9791 2672 : if (newConstraint->conname)
9792 : {
9793 1200 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
9794 : RelationGetRelid(rel),
9795 1200 : newConstraint->conname))
9796 0 : ereport(ERROR,
9797 : (errcode(ERRCODE_DUPLICATE_OBJECT),
9798 : errmsg("constraint \"%s\" for relation \"%s\" already exists",
9799 : newConstraint->conname,
9800 : RelationGetRelationName(rel))));
9801 : }
9802 : else
9803 1472 : newConstraint->conname =
9804 1472 : ChooseConstraintName(RelationGetRelationName(rel),
9805 1472 : ChooseForeignKeyConstraintNameAddition(newConstraint->fk_attrs),
9806 : "fkey",
9807 1472 : RelationGetNamespace(rel),
9808 : NIL);
9809 :
9810 2672 : address = ATAddForeignKeyConstraint(wqueue, tab, rel,
9811 : newConstraint,
9812 : recurse, false,
9813 : lockmode);
9814 2124 : break;
9815 :
9816 0 : default:
9817 0 : elog(ERROR, "unrecognized constraint type: %d",
9818 : (int) newConstraint->contype);
9819 : }
9820 :
9821 12156 : return address;
9822 : }
9823 :
9824 : /*
9825 : * Generate the column-name portion of the constraint name for a new foreign
9826 : * key given the list of column names that reference the referenced
9827 : * table. This will be passed to ChooseConstraintName along with the parent
9828 : * table name and the "fkey" suffix.
9829 : *
9830 : * We know that less than NAMEDATALEN characters will actually be used, so we
9831 : * can truncate the result once we've generated that many.
9832 : *
9833 : * XXX see also ChooseExtendedStatisticNameAddition and
9834 : * ChooseIndexNameAddition.
9835 : */
9836 : static char *
9837 1472 : ChooseForeignKeyConstraintNameAddition(List *colnames)
9838 : {
9839 : char buf[NAMEDATALEN * 2];
9840 1472 : int buflen = 0;
9841 : ListCell *lc;
9842 :
9843 1472 : buf[0] = '\0';
9844 3372 : foreach(lc, colnames)
9845 : {
9846 1900 : const char *name = strVal(lfirst(lc));
9847 :
9848 1900 : if (buflen > 0)
9849 428 : buf[buflen++] = '_'; /* insert _ between names */
9850 :
9851 : /*
9852 : * At this point we have buflen <= NAMEDATALEN. name should be less
9853 : * than NAMEDATALEN already, but use strlcpy for paranoia.
9854 : */
9855 1900 : strlcpy(buf + buflen, name, NAMEDATALEN);
9856 1900 : buflen += strlen(buf + buflen);
9857 1900 : if (buflen >= NAMEDATALEN)
9858 0 : break;
9859 : }
9860 1472 : return pstrdup(buf);
9861 : }
9862 :
9863 : /*
9864 : * Add a check or not-null constraint to a single table and its children.
9865 : * Returns the address of the constraint added to the parent relation,
9866 : * if one gets added, or InvalidObjectAddress otherwise.
9867 : *
9868 : * Subroutine for ATExecAddConstraint.
9869 : *
9870 : * We must recurse to child tables during execution, rather than using
9871 : * ALTER TABLE's normal prep-time recursion. The reason is that all the
9872 : * constraints *must* be given the same name, else they won't be seen as
9873 : * related later. If the user didn't explicitly specify a name, then
9874 : * AddRelationNewConstraints would normally assign different names to the
9875 : * child constraints. To fix that, we must capture the name assigned at
9876 : * the parent table and pass that down.
9877 : */
9878 : static ObjectAddress
9879 10966 : ATAddCheckNNConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9880 : Constraint *constr, bool recurse, bool recursing,
9881 : bool is_readd, LOCKMODE lockmode)
9882 : {
9883 : List *newcons;
9884 : ListCell *lcon;
9885 : List *children;
9886 : ListCell *child;
9887 10966 : ObjectAddress address = InvalidObjectAddress;
9888 :
9889 : /* Guard against stack overflow due to overly deep inheritance tree. */
9890 10966 : check_stack_depth();
9891 :
9892 : /* At top level, permission check was done in ATPrepCmd, else do it */
9893 10966 : if (recursing)
9894 790 : ATSimplePermissions(AT_AddConstraint, rel,
9895 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9896 :
9897 : /*
9898 : * Call AddRelationNewConstraints to do the work, making sure it works on
9899 : * a copy of the Constraint so transformExpr can't modify the original. It
9900 : * returns a list of cooked constraints.
9901 : *
9902 : * If the constraint ends up getting merged with a pre-existing one, it's
9903 : * omitted from the returned list, which is what we want: we do not need
9904 : * to do any validation work. That can only happen at child tables,
9905 : * though, since we disallow merging at the top level.
9906 : */
9907 10966 : newcons = AddRelationNewConstraints(rel, NIL,
9908 10966 : list_make1(copyObject(constr)),
9909 10966 : recursing || is_readd, /* allow_merge */
9910 10966 : !recursing, /* is_local */
9911 : is_readd, /* is_internal */
9912 10966 : NULL); /* queryString not available
9913 : * here */
9914 :
9915 : /* we don't expect more than one constraint here */
9916 : Assert(list_length(newcons) <= 1);
9917 :
9918 : /* Add each to-be-validated constraint to Phase 3's queue */
9919 21456 : foreach(lcon, newcons)
9920 : {
9921 10628 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lcon);
9922 :
9923 10628 : if (!ccon->skip_validation && ccon->contype != CONSTR_NOTNULL)
9924 : {
9925 : NewConstraint *newcon;
9926 :
9927 910 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
9928 910 : newcon->name = ccon->name;
9929 910 : newcon->contype = ccon->contype;
9930 910 : newcon->qual = ccon->expr;
9931 :
9932 910 : tab->constraints = lappend(tab->constraints, newcon);
9933 : }
9934 :
9935 : /* Save the actually assigned name if it was defaulted */
9936 10628 : if (constr->conname == NULL)
9937 8898 : constr->conname = ccon->name;
9938 :
9939 : /*
9940 : * If adding a valid not-null constraint, set the pg_attribute flag
9941 : * and tell phase 3 to verify existing rows, if needed. For an
9942 : * invalid constraint, just set attnotnull, without queueing
9943 : * verification.
9944 : */
9945 10628 : if (constr->contype == CONSTR_NOTNULL)
9946 9314 : set_attnotnull(wqueue, rel, ccon->attnum,
9947 9314 : !constr->skip_validation,
9948 9314 : !constr->skip_validation);
9949 :
9950 10628 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
9951 : }
9952 :
9953 : /* At this point we must have a locked-down name to use */
9954 : Assert(newcons == NIL || constr->conname != NULL);
9955 :
9956 : /* Advance command counter in case same table is visited multiple times */
9957 10828 : CommandCounterIncrement();
9958 :
9959 : /*
9960 : * If the constraint got merged with an existing constraint, we're done.
9961 : * We mustn't recurse to child tables in this case, because they've
9962 : * already got the constraint, and visiting them again would lead to an
9963 : * incorrect value for coninhcount.
9964 : */
9965 10828 : if (newcons == NIL)
9966 200 : return address;
9967 :
9968 : /*
9969 : * If adding a NO INHERIT constraint, no need to find our children.
9970 : */
9971 10628 : if (constr->is_no_inherit)
9972 84 : return address;
9973 :
9974 : /*
9975 : * Propagate to children as appropriate. Unlike most other ALTER
9976 : * routines, we have to do this one level of recursion at a time; we can't
9977 : * use find_all_inheritors to do it in one pass.
9978 : */
9979 : children =
9980 10544 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9981 :
9982 : /*
9983 : * Check if ONLY was specified with ALTER TABLE. If so, allow the
9984 : * constraint creation only if there are no children currently. Error out
9985 : * otherwise.
9986 : */
9987 10544 : if (!recurse && children != NIL)
9988 6 : ereport(ERROR,
9989 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9990 : errmsg("constraint must be added to child tables too")));
9991 :
9992 : /*
9993 : * Recurse to create the constraint on each child.
9994 : */
9995 11298 : foreach(child, children)
9996 : {
9997 790 : Oid childrelid = lfirst_oid(child);
9998 : Relation childrel;
9999 : AlteredTableInfo *childtab;
10000 :
10001 : /* find_inheritance_children already got lock */
10002 790 : childrel = table_open(childrelid, NoLock);
10003 790 : CheckAlterTableIsSafe(childrel);
10004 :
10005 : /* Find or create work queue entry for this table */
10006 790 : childtab = ATGetQueueEntry(wqueue, childrel);
10007 :
10008 : /* Recurse to this child */
10009 790 : ATAddCheckNNConstraint(wqueue, childtab, childrel,
10010 : constr, recurse, true, is_readd, lockmode);
10011 :
10012 760 : table_close(childrel, NoLock);
10013 : }
10014 :
10015 10508 : return address;
10016 : }
10017 :
10018 : /*
10019 : * Add a foreign-key constraint to a single table; return the new constraint's
10020 : * address.
10021 : *
10022 : * Subroutine for ATExecAddConstraint. Must already hold exclusive
10023 : * lock on the rel, and have done appropriate validity checks for it.
10024 : * We do permissions checks here, however.
10025 : *
10026 : * When the referenced or referencing tables (or both) are partitioned,
10027 : * multiple pg_constraint rows are required -- one for each partitioned table
10028 : * and each partition on each side (fortunately, not one for every combination
10029 : * thereof). We also need action triggers on each leaf partition on the
10030 : * referenced side, and check triggers on each leaf partition on the
10031 : * referencing side.
10032 : */
10033 : static ObjectAddress
10034 2672 : ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
10035 : Constraint *fkconstraint,
10036 : bool recurse, bool recursing, LOCKMODE lockmode)
10037 : {
10038 : Relation pkrel;
10039 2672 : int16 pkattnum[INDEX_MAX_KEYS] = {0};
10040 2672 : int16 fkattnum[INDEX_MAX_KEYS] = {0};
10041 2672 : Oid pktypoid[INDEX_MAX_KEYS] = {0};
10042 2672 : Oid fktypoid[INDEX_MAX_KEYS] = {0};
10043 2672 : Oid pkcolloid[INDEX_MAX_KEYS] = {0};
10044 2672 : Oid fkcolloid[INDEX_MAX_KEYS] = {0};
10045 2672 : Oid opclasses[INDEX_MAX_KEYS] = {0};
10046 2672 : Oid pfeqoperators[INDEX_MAX_KEYS] = {0};
10047 2672 : Oid ppeqoperators[INDEX_MAX_KEYS] = {0};
10048 2672 : Oid ffeqoperators[INDEX_MAX_KEYS] = {0};
10049 2672 : int16 fkdelsetcols[INDEX_MAX_KEYS] = {0};
10050 : bool with_period;
10051 : bool pk_has_without_overlaps;
10052 : int i;
10053 : int numfks,
10054 : numpks,
10055 : numfkdelsetcols;
10056 : Oid indexOid;
10057 : bool old_check_ok;
10058 : ObjectAddress address;
10059 2672 : ListCell *old_pfeqop_item = list_head(fkconstraint->old_conpfeqop);
10060 :
10061 : /*
10062 : * Grab ShareRowExclusiveLock on the pk table, so that someone doesn't
10063 : * delete rows out from under us.
10064 : */
10065 2672 : if (OidIsValid(fkconstraint->old_pktable_oid))
10066 72 : pkrel = table_open(fkconstraint->old_pktable_oid, ShareRowExclusiveLock);
10067 : else
10068 2600 : pkrel = table_openrv(fkconstraint->pktable, ShareRowExclusiveLock);
10069 :
10070 : /*
10071 : * Validity checks (permission checks wait till we have the column
10072 : * numbers)
10073 : */
10074 2666 : if (!recurse && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10075 6 : ereport(ERROR,
10076 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
10077 : errmsg("cannot use ONLY for foreign key on partitioned table \"%s\" referencing relation \"%s\"",
10078 : RelationGetRelationName(rel),
10079 : RelationGetRelationName(pkrel)));
10080 :
10081 2660 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10082 350 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10083 0 : ereport(ERROR,
10084 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10085 : errmsg("referenced relation \"%s\" is not a table",
10086 : RelationGetRelationName(pkrel))));
10087 :
10088 2660 : if (!allowSystemTableMods && IsSystemRelation(pkrel))
10089 2 : ereport(ERROR,
10090 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
10091 : errmsg("permission denied: \"%s\" is a system catalog",
10092 : RelationGetRelationName(pkrel))));
10093 :
10094 : /*
10095 : * References from permanent or unlogged tables to temp tables, and from
10096 : * permanent tables to unlogged tables, are disallowed because the
10097 : * referenced data can vanish out from under us. References from temp
10098 : * tables to any other table type are also disallowed, because other
10099 : * backends might need to run the RI triggers on the perm table, but they
10100 : * can't reliably see tuples in the local buffers of other backends.
10101 : */
10102 2658 : switch (rel->rd_rel->relpersistence)
10103 : {
10104 2368 : case RELPERSISTENCE_PERMANENT:
10105 2368 : if (!RelationIsPermanent(pkrel))
10106 0 : ereport(ERROR,
10107 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10108 : errmsg("constraints on permanent tables may reference only permanent tables")));
10109 2368 : break;
10110 12 : case RELPERSISTENCE_UNLOGGED:
10111 12 : if (!RelationIsPermanent(pkrel)
10112 12 : && pkrel->rd_rel->relpersistence != RELPERSISTENCE_UNLOGGED)
10113 0 : ereport(ERROR,
10114 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10115 : errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
10116 12 : break;
10117 278 : case RELPERSISTENCE_TEMP:
10118 278 : if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
10119 0 : ereport(ERROR,
10120 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10121 : errmsg("constraints on temporary tables may reference only temporary tables")));
10122 278 : if (!pkrel->rd_islocaltemp || !rel->rd_islocaltemp)
10123 0 : ereport(ERROR,
10124 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10125 : errmsg("constraints on temporary tables must involve temporary tables of this session")));
10126 278 : break;
10127 : }
10128 :
10129 : /*
10130 : * Look up the referencing attributes to make sure they exist, and record
10131 : * their attnums and type and collation OIDs.
10132 : */
10133 2658 : numfks = transformColumnNameList(RelationGetRelid(rel),
10134 : fkconstraint->fk_attrs,
10135 : fkattnum, fktypoid, fkcolloid);
10136 2628 : with_period = fkconstraint->fk_with_period || fkconstraint->pk_with_period;
10137 2628 : if (with_period && !fkconstraint->fk_with_period)
10138 24 : ereport(ERROR,
10139 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10140 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10141 :
10142 2604 : numfkdelsetcols = transformColumnNameList(RelationGetRelid(rel),
10143 : fkconstraint->fk_del_set_cols,
10144 : fkdelsetcols, NULL, NULL);
10145 2598 : numfkdelsetcols = validateFkOnDeleteSetColumns(numfks, fkattnum,
10146 : numfkdelsetcols,
10147 : fkdelsetcols,
10148 : fkconstraint->fk_del_set_cols);
10149 :
10150 : /*
10151 : * If the attribute list for the referenced table was omitted, lookup the
10152 : * definition of the primary key and use it. Otherwise, validate the
10153 : * supplied attribute list. In either case, discover the index OID and
10154 : * index opclasses, and the attnums and type and collation OIDs of the
10155 : * attributes.
10156 : */
10157 2592 : if (fkconstraint->pk_attrs == NIL)
10158 : {
10159 1256 : numpks = transformFkeyGetPrimaryKey(pkrel, &indexOid,
10160 : &fkconstraint->pk_attrs,
10161 : pkattnum, pktypoid, pkcolloid,
10162 : opclasses, &pk_has_without_overlaps);
10163 :
10164 : /* If the primary key uses WITHOUT OVERLAPS, the fk must use PERIOD */
10165 1256 : if (pk_has_without_overlaps && !fkconstraint->fk_with_period)
10166 24 : ereport(ERROR,
10167 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10168 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10169 : }
10170 : else
10171 : {
10172 1336 : numpks = transformColumnNameList(RelationGetRelid(pkrel),
10173 : fkconstraint->pk_attrs,
10174 : pkattnum, pktypoid, pkcolloid);
10175 :
10176 : /* Since we got pk_attrs, one should be a period. */
10177 1306 : if (with_period && !fkconstraint->pk_with_period)
10178 24 : ereport(ERROR,
10179 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10180 : errmsg("foreign key uses PERIOD on the referencing table but not the referenced table"));
10181 :
10182 : /* Look for an index matching the column list */
10183 1282 : indexOid = transformFkeyCheckAttrs(pkrel, numpks, pkattnum,
10184 : with_period, opclasses, &pk_has_without_overlaps);
10185 : }
10186 :
10187 : /*
10188 : * If the referenced primary key has WITHOUT OVERLAPS, the foreign key
10189 : * must use PERIOD.
10190 : */
10191 2478 : if (pk_has_without_overlaps && !with_period)
10192 12 : ereport(ERROR,
10193 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10194 : errmsg("foreign key must use PERIOD when referencing a primary key using WITHOUT OVERLAPS"));
10195 :
10196 : /*
10197 : * Now we can check permissions.
10198 : */
10199 2466 : checkFkeyPermissions(pkrel, pkattnum, numpks);
10200 :
10201 : /*
10202 : * Check some things for generated columns.
10203 : */
10204 5796 : for (i = 0; i < numfks; i++)
10205 : {
10206 3360 : char attgenerated = TupleDescAttr(RelationGetDescr(rel), fkattnum[i] - 1)->attgenerated;
10207 :
10208 3360 : if (attgenerated)
10209 : {
10210 : /*
10211 : * Check restrictions on UPDATE/DELETE actions, per SQL standard
10212 : */
10213 48 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10214 48 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT ||
10215 48 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE)
10216 12 : ereport(ERROR,
10217 : (errcode(ERRCODE_SYNTAX_ERROR),
10218 : errmsg("invalid %s action for foreign key constraint containing generated column",
10219 : "ON UPDATE")));
10220 36 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10221 24 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10222 12 : ereport(ERROR,
10223 : (errcode(ERRCODE_SYNTAX_ERROR),
10224 : errmsg("invalid %s action for foreign key constraint containing generated column",
10225 : "ON DELETE")));
10226 : }
10227 :
10228 : /*
10229 : * FKs on virtual columns are not supported. This would require
10230 : * various additional support in ri_triggers.c, including special
10231 : * handling in ri_NullCheck(), ri_KeysEqual(),
10232 : * RI_FKey_fk_upd_check_required() (since all virtual columns appear
10233 : * as NULL there). Also not really practical as long as you can't
10234 : * index virtual columns.
10235 : */
10236 3336 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
10237 6 : ereport(ERROR,
10238 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10239 : errmsg("foreign key constraints on virtual generated columns are not supported")));
10240 : }
10241 :
10242 : /*
10243 : * Some actions are currently unsupported for foreign keys using PERIOD.
10244 : */
10245 2436 : if (fkconstraint->fk_with_period)
10246 : {
10247 278 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_RESTRICT ||
10248 266 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE ||
10249 248 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10250 230 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT)
10251 66 : ereport(ERROR,
10252 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10253 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10254 : "ON UPDATE"));
10255 :
10256 212 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_RESTRICT ||
10257 206 : fkconstraint->fk_del_action == FKCONSTR_ACTION_CASCADE ||
10258 206 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10259 206 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10260 6 : ereport(ERROR,
10261 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10262 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10263 : "ON DELETE"));
10264 : }
10265 :
10266 : /*
10267 : * Look up the equality operators to use in the constraint.
10268 : *
10269 : * Note that we have to be careful about the difference between the actual
10270 : * PK column type and the opclass' declared input type, which might be
10271 : * only binary-compatible with it. The declared opcintype is the right
10272 : * thing to probe pg_amop with.
10273 : */
10274 2364 : if (numfks != numpks)
10275 0 : ereport(ERROR,
10276 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
10277 : errmsg("number of referencing and referenced columns for foreign key disagree")));
10278 :
10279 : /*
10280 : * On the strength of a previous constraint, we might avoid scanning
10281 : * tables to validate this one. See below.
10282 : */
10283 2364 : old_check_ok = (fkconstraint->old_conpfeqop != NIL);
10284 : Assert(!old_check_ok || numfks == list_length(fkconstraint->old_conpfeqop));
10285 :
10286 5166 : for (i = 0; i < numpks; i++)
10287 : {
10288 3042 : Oid pktype = pktypoid[i];
10289 3042 : Oid fktype = fktypoid[i];
10290 : Oid fktyped;
10291 3042 : Oid pkcoll = pkcolloid[i];
10292 3042 : Oid fkcoll = fkcolloid[i];
10293 : HeapTuple cla_ht;
10294 : Form_pg_opclass cla_tup;
10295 : Oid amid;
10296 : Oid opfamily;
10297 : Oid opcintype;
10298 : bool for_overlaps;
10299 : CompareType cmptype;
10300 : Oid pfeqop;
10301 : Oid ppeqop;
10302 : Oid ffeqop;
10303 : int16 eqstrategy;
10304 : Oid pfeqop_right;
10305 :
10306 : /* We need several fields out of the pg_opclass entry */
10307 3042 : cla_ht = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclasses[i]));
10308 3042 : if (!HeapTupleIsValid(cla_ht))
10309 0 : elog(ERROR, "cache lookup failed for opclass %u", opclasses[i]);
10310 3042 : cla_tup = (Form_pg_opclass) GETSTRUCT(cla_ht);
10311 3042 : amid = cla_tup->opcmethod;
10312 3042 : opfamily = cla_tup->opcfamily;
10313 3042 : opcintype = cla_tup->opcintype;
10314 3042 : ReleaseSysCache(cla_ht);
10315 :
10316 : /*
10317 : * Get strategy number from index AM.
10318 : *
10319 : * For a normal foreign-key constraint, this should not fail, since we
10320 : * already checked that the index is unique and should therefore have
10321 : * appropriate equal operators. For a period foreign key, this could
10322 : * fail if we selected a non-matching exclusion constraint earlier.
10323 : * (XXX Maybe we should do these lookups earlier so we don't end up
10324 : * doing that.)
10325 : */
10326 3042 : for_overlaps = with_period && i == numpks - 1;
10327 3042 : cmptype = for_overlaps ? COMPARE_OVERLAP : COMPARE_EQ;
10328 3042 : eqstrategy = IndexAmTranslateCompareType(cmptype, amid, opfamily, true);
10329 3042 : if (eqstrategy == InvalidStrategy)
10330 0 : ereport(ERROR,
10331 : errcode(ERRCODE_UNDEFINED_OBJECT),
10332 : for_overlaps
10333 : ? errmsg("could not identify an overlaps operator for foreign key")
10334 : : errmsg("could not identify an equality operator for foreign key"),
10335 : errdetail("Could not translate compare type %d for operator family \"%s\" of access method \"%s\".",
10336 : cmptype, get_opfamily_name(opfamily, false), get_am_name(amid)));
10337 :
10338 : /*
10339 : * There had better be a primary equality operator for the index.
10340 : * We'll use it for PK = PK comparisons.
10341 : */
10342 3042 : ppeqop = get_opfamily_member(opfamily, opcintype, opcintype,
10343 : eqstrategy);
10344 :
10345 3042 : if (!OidIsValid(ppeqop))
10346 0 : elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
10347 : eqstrategy, opcintype, opcintype, opfamily);
10348 :
10349 : /*
10350 : * Are there equality operators that take exactly the FK type? Assume
10351 : * we should look through any domain here.
10352 : */
10353 3042 : fktyped = getBaseType(fktype);
10354 :
10355 3042 : pfeqop = get_opfamily_member(opfamily, opcintype, fktyped,
10356 : eqstrategy);
10357 3042 : if (OidIsValid(pfeqop))
10358 : {
10359 2346 : pfeqop_right = fktyped;
10360 2346 : ffeqop = get_opfamily_member(opfamily, fktyped, fktyped,
10361 : eqstrategy);
10362 : }
10363 : else
10364 : {
10365 : /* keep compiler quiet */
10366 696 : pfeqop_right = InvalidOid;
10367 696 : ffeqop = InvalidOid;
10368 : }
10369 :
10370 3042 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10371 : {
10372 : /*
10373 : * Otherwise, look for an implicit cast from the FK type to the
10374 : * opcintype, and if found, use the primary equality operator.
10375 : * This is a bit tricky because opcintype might be a polymorphic
10376 : * type such as ANYARRAY or ANYENUM; so what we have to test is
10377 : * whether the two actual column types can be concurrently cast to
10378 : * that type. (Otherwise, we'd fail to reject combinations such
10379 : * as int[] and point[].)
10380 : */
10381 : Oid input_typeids[2];
10382 : Oid target_typeids[2];
10383 :
10384 696 : input_typeids[0] = pktype;
10385 696 : input_typeids[1] = fktype;
10386 696 : target_typeids[0] = opcintype;
10387 696 : target_typeids[1] = opcintype;
10388 696 : if (can_coerce_type(2, input_typeids, target_typeids,
10389 : COERCION_IMPLICIT))
10390 : {
10391 468 : pfeqop = ffeqop = ppeqop;
10392 468 : pfeqop_right = opcintype;
10393 : }
10394 : }
10395 :
10396 3042 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10397 228 : ereport(ERROR,
10398 : (errcode(ERRCODE_DATATYPE_MISMATCH),
10399 : errmsg("foreign key constraint \"%s\" cannot be implemented",
10400 : fkconstraint->conname),
10401 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10402 : "are of incompatible types: %s and %s.",
10403 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10404 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10405 : format_type_be(fktype),
10406 : format_type_be(pktype))));
10407 :
10408 : /*
10409 : * This shouldn't be possible, but better check to make sure we have a
10410 : * consistent state for the check below.
10411 : */
10412 2814 : if ((OidIsValid(pkcoll) && !OidIsValid(fkcoll)) || (!OidIsValid(pkcoll) && OidIsValid(fkcoll)))
10413 0 : elog(ERROR, "key columns are not both collatable");
10414 :
10415 2814 : if (OidIsValid(pkcoll) && OidIsValid(fkcoll))
10416 : {
10417 : bool pkcolldet;
10418 : bool fkcolldet;
10419 :
10420 104 : pkcolldet = get_collation_isdeterministic(pkcoll);
10421 104 : fkcolldet = get_collation_isdeterministic(fkcoll);
10422 :
10423 : /*
10424 : * SQL requires that both collations are the same. This is
10425 : * because we need a consistent notion of equality on both
10426 : * columns. We relax this by allowing different collations if
10427 : * they are both deterministic. (This is also for backward
10428 : * compatibility, because PostgreSQL has always allowed this.)
10429 : */
10430 104 : if ((!pkcolldet || !fkcolldet) && pkcoll != fkcoll)
10431 12 : ereport(ERROR,
10432 : (errcode(ERRCODE_COLLATION_MISMATCH),
10433 : errmsg("foreign key constraint \"%s\" cannot be implemented", fkconstraint->conname),
10434 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10435 : "have incompatible collations: \"%s\" and \"%s\". "
10436 : "If either collation is nondeterministic, then both collations have to be the same.",
10437 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10438 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10439 : get_collation_name(fkcoll),
10440 : get_collation_name(pkcoll))));
10441 : }
10442 :
10443 2802 : if (old_check_ok)
10444 : {
10445 : /*
10446 : * When a pfeqop changes, revalidate the constraint. We could
10447 : * permit intra-opfamily changes, but that adds subtle complexity
10448 : * without any concrete benefit for core types. We need not
10449 : * assess ppeqop or ffeqop, which RI_Initial_Check() does not use.
10450 : */
10451 6 : old_check_ok = (pfeqop == lfirst_oid(old_pfeqop_item));
10452 6 : old_pfeqop_item = lnext(fkconstraint->old_conpfeqop,
10453 : old_pfeqop_item);
10454 : }
10455 2802 : if (old_check_ok)
10456 : {
10457 : Oid old_fktype;
10458 : Oid new_fktype;
10459 : CoercionPathType old_pathtype;
10460 : CoercionPathType new_pathtype;
10461 : Oid old_castfunc;
10462 : Oid new_castfunc;
10463 : Oid old_fkcoll;
10464 : Oid new_fkcoll;
10465 6 : Form_pg_attribute attr = TupleDescAttr(tab->oldDesc,
10466 6 : fkattnum[i] - 1);
10467 :
10468 : /*
10469 : * Identify coercion pathways from each of the old and new FK-side
10470 : * column types to the right (foreign) operand type of the pfeqop.
10471 : * We may assume that pg_constraint.conkey is not changing.
10472 : */
10473 6 : old_fktype = attr->atttypid;
10474 6 : new_fktype = fktype;
10475 6 : old_pathtype = findFkeyCast(pfeqop_right, old_fktype,
10476 : &old_castfunc);
10477 6 : new_pathtype = findFkeyCast(pfeqop_right, new_fktype,
10478 : &new_castfunc);
10479 :
10480 6 : old_fkcoll = attr->attcollation;
10481 6 : new_fkcoll = fkcoll;
10482 :
10483 : /*
10484 : * Upon a change to the cast from the FK column to its pfeqop
10485 : * operand, revalidate the constraint. For this evaluation, a
10486 : * binary coercion cast is equivalent to no cast at all. While
10487 : * type implementors should design implicit casts with an eye
10488 : * toward consistency of operations like equality, we cannot
10489 : * assume here that they have done so.
10490 : *
10491 : * A function with a polymorphic argument could change behavior
10492 : * arbitrarily in response to get_fn_expr_argtype(). Therefore,
10493 : * when the cast destination is polymorphic, we only avoid
10494 : * revalidation if the input type has not changed at all. Given
10495 : * just the core data types and operator classes, this requirement
10496 : * prevents no would-be optimizations.
10497 : *
10498 : * If the cast converts from a base type to a domain thereon, then
10499 : * that domain type must be the opcintype of the unique index.
10500 : * Necessarily, the primary key column must then be of the domain
10501 : * type. Since the constraint was previously valid, all values on
10502 : * the foreign side necessarily exist on the primary side and in
10503 : * turn conform to the domain. Consequently, we need not treat
10504 : * domains specially here.
10505 : *
10506 : * If the collation changes, revalidation is required, unless both
10507 : * collations are deterministic, because those share the same
10508 : * notion of equality (because texteq reduces to bitwise
10509 : * equality).
10510 : *
10511 : * We need not directly consider the PK type. It's necessarily
10512 : * binary coercible to the opcintype of the unique index column,
10513 : * and ri_triggers.c will only deal with PK datums in terms of
10514 : * that opcintype. Changing the opcintype also changes pfeqop.
10515 : */
10516 6 : old_check_ok = (new_pathtype == old_pathtype &&
10517 6 : new_castfunc == old_castfunc &&
10518 6 : (!IsPolymorphicType(pfeqop_right) ||
10519 12 : new_fktype == old_fktype) &&
10520 0 : (new_fkcoll == old_fkcoll ||
10521 0 : (get_collation_isdeterministic(old_fkcoll) && get_collation_isdeterministic(new_fkcoll))));
10522 : }
10523 :
10524 2802 : pfeqoperators[i] = pfeqop;
10525 2802 : ppeqoperators[i] = ppeqop;
10526 2802 : ffeqoperators[i] = ffeqop;
10527 : }
10528 :
10529 : /*
10530 : * For FKs with PERIOD we need additional operators to check whether the
10531 : * referencing row's range is contained by the aggregated ranges of the
10532 : * referenced row(s). For rangetypes and multirangetypes this is
10533 : * fk.periodatt <@ range_agg(pk.periodatt). Those are the only types we
10534 : * support for now. FKs will look these up at "runtime", but we should
10535 : * make sure the lookup works here, even if we don't use the values.
10536 : */
10537 2124 : if (with_period)
10538 : {
10539 : Oid periodoperoid;
10540 : Oid aggedperiodoperoid;
10541 : Oid intersectoperoid;
10542 :
10543 188 : FindFKPeriodOpers(opclasses[numpks - 1], &periodoperoid, &aggedperiodoperoid,
10544 : &intersectoperoid);
10545 : }
10546 :
10547 : /* First, create the constraint catalog entry itself. */
10548 2124 : address = addFkConstraint(addFkBothSides,
10549 : fkconstraint->conname, fkconstraint, rel, pkrel,
10550 : indexOid,
10551 : InvalidOid, /* no parent constraint */
10552 : numfks,
10553 : pkattnum,
10554 : fkattnum,
10555 : pfeqoperators,
10556 : ppeqoperators,
10557 : ffeqoperators,
10558 : numfkdelsetcols,
10559 : fkdelsetcols,
10560 : false,
10561 : with_period);
10562 :
10563 : /* Next process the action triggers at the referenced side and recurse */
10564 2124 : addFkRecurseReferenced(fkconstraint, rel, pkrel,
10565 : indexOid,
10566 : address.objectId,
10567 : numfks,
10568 : pkattnum,
10569 : fkattnum,
10570 : pfeqoperators,
10571 : ppeqoperators,
10572 : ffeqoperators,
10573 : numfkdelsetcols,
10574 : fkdelsetcols,
10575 : old_check_ok,
10576 : InvalidOid, InvalidOid,
10577 : with_period);
10578 :
10579 : /* Lastly create the check triggers at the referencing side and recurse */
10580 2124 : addFkRecurseReferencing(wqueue, fkconstraint, rel, pkrel,
10581 : indexOid,
10582 : address.objectId,
10583 : numfks,
10584 : pkattnum,
10585 : fkattnum,
10586 : pfeqoperators,
10587 : ppeqoperators,
10588 : ffeqoperators,
10589 : numfkdelsetcols,
10590 : fkdelsetcols,
10591 : old_check_ok,
10592 : lockmode,
10593 : InvalidOid, InvalidOid,
10594 : with_period);
10595 :
10596 : /*
10597 : * Done. Close pk table, but keep lock until we've committed.
10598 : */
10599 2124 : table_close(pkrel, NoLock);
10600 :
10601 2124 : return address;
10602 : }
10603 :
10604 : /*
10605 : * validateFkOnDeleteSetColumns
10606 : * Verifies that columns used in ON DELETE SET NULL/DEFAULT (...)
10607 : * column lists are valid.
10608 : *
10609 : * If there are duplicates in the fksetcolsattnums[] array, this silently
10610 : * removes the dups. The new count of numfksetcols is returned.
10611 : */
10612 : static int
10613 2598 : validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
10614 : int numfksetcols, int16 *fksetcolsattnums,
10615 : List *fksetcols)
10616 : {
10617 2598 : int numcolsout = 0;
10618 :
10619 2628 : for (int i = 0; i < numfksetcols; i++)
10620 : {
10621 36 : int16 setcol_attnum = fksetcolsattnums[i];
10622 36 : bool seen = false;
10623 :
10624 : /* Make sure it's in fkattnums[] */
10625 66 : for (int j = 0; j < numfks; j++)
10626 : {
10627 60 : if (fkattnums[j] == setcol_attnum)
10628 : {
10629 30 : seen = true;
10630 30 : break;
10631 : }
10632 : }
10633 :
10634 36 : if (!seen)
10635 : {
10636 6 : char *col = strVal(list_nth(fksetcols, i));
10637 :
10638 6 : ereport(ERROR,
10639 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
10640 : errmsg("column \"%s\" referenced in ON DELETE SET action must be part of foreign key", col)));
10641 : }
10642 :
10643 : /* Now check for dups */
10644 30 : seen = false;
10645 30 : for (int j = 0; j < numcolsout; j++)
10646 : {
10647 6 : if (fksetcolsattnums[j] == setcol_attnum)
10648 : {
10649 6 : seen = true;
10650 6 : break;
10651 : }
10652 : }
10653 30 : if (!seen)
10654 24 : fksetcolsattnums[numcolsout++] = setcol_attnum;
10655 : }
10656 2592 : return numcolsout;
10657 : }
10658 :
10659 : /*
10660 : * addFkConstraint
10661 : * Install pg_constraint entries to implement a foreign key constraint.
10662 : * Caller must separately invoke addFkRecurseReferenced and
10663 : * addFkRecurseReferencing, as appropriate, to install pg_trigger entries
10664 : * and (for partitioned tables) recurse to partitions.
10665 : *
10666 : * fkside: the side of the FK (or both) to create. Caller should
10667 : * call addFkRecurseReferenced if this is addFkReferencedSide,
10668 : * addFkRecurseReferencing if it's addFkReferencingSide, or both if it's
10669 : * addFkBothSides.
10670 : * constraintname: the base name for the constraint being added,
10671 : * copied to fkconstraint->conname if the latter is not set
10672 : * fkconstraint: the constraint being added
10673 : * rel: the root referencing relation
10674 : * pkrel: the referenced relation; might be a partition, if recursing
10675 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10676 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10677 : * top-level constraint
10678 : * numfks: the number of columns in the foreign key
10679 : * pkattnum: the attnum array of referenced attributes
10680 : * fkattnum: the attnum array of referencing attributes
10681 : * pf/pp/ffeqoperators: OID array of operators between columns
10682 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10683 : * (...) clause
10684 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10685 : * NULL/DEFAULT clause
10686 : * with_period: true if this is a temporal FK
10687 : */
10688 : static ObjectAddress
10689 4100 : addFkConstraint(addFkConstraintSides fkside,
10690 : char *constraintname, Constraint *fkconstraint,
10691 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
10692 : int numfks, int16 *pkattnum,
10693 : int16 *fkattnum, Oid *pfeqoperators, Oid *ppeqoperators,
10694 : Oid *ffeqoperators, int numfkdelsetcols, int16 *fkdelsetcols,
10695 : bool is_internal, bool with_period)
10696 : {
10697 : ObjectAddress address;
10698 : Oid constrOid;
10699 : char *conname;
10700 : bool conislocal;
10701 : int16 coninhcount;
10702 : bool connoinherit;
10703 :
10704 : /*
10705 : * Verify relkind for each referenced partition. At the top level, this
10706 : * is redundant with a previous check, but we need it when recursing.
10707 : */
10708 4100 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10709 868 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10710 0 : ereport(ERROR,
10711 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10712 : errmsg("referenced relation \"%s\" is not a table",
10713 : RelationGetRelationName(pkrel))));
10714 :
10715 : /*
10716 : * Caller supplies us with a constraint name; however, it may be used in
10717 : * this partition, so come up with a different one in that case. Unless
10718 : * truncation to NAMEDATALEN dictates otherwise, the new name will be the
10719 : * supplied name with an underscore and digit(s) appended.
10720 : */
10721 4100 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
10722 : RelationGetRelid(rel),
10723 : constraintname))
10724 1176 : conname = ChooseConstraintName(constraintname,
10725 : NULL,
10726 : "",
10727 1176 : RelationGetNamespace(rel), NIL);
10728 : else
10729 2924 : conname = constraintname;
10730 :
10731 4100 : if (fkconstraint->conname == NULL)
10732 436 : fkconstraint->conname = pstrdup(conname);
10733 :
10734 4100 : if (OidIsValid(parentConstr))
10735 : {
10736 1976 : conislocal = false;
10737 1976 : coninhcount = 1;
10738 1976 : connoinherit = false;
10739 : }
10740 : else
10741 : {
10742 2124 : conislocal = true;
10743 2124 : coninhcount = 0;
10744 :
10745 : /*
10746 : * always inherit for partitioned tables, never for legacy inheritance
10747 : */
10748 2124 : connoinherit = rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE;
10749 : }
10750 :
10751 : /*
10752 : * Record the FK constraint in pg_constraint.
10753 : */
10754 4100 : constrOid = CreateConstraintEntry(conname,
10755 4100 : RelationGetNamespace(rel),
10756 : CONSTRAINT_FOREIGN,
10757 4100 : fkconstraint->deferrable,
10758 4100 : fkconstraint->initdeferred,
10759 4100 : fkconstraint->is_enforced,
10760 4100 : fkconstraint->initially_valid,
10761 : parentConstr,
10762 : RelationGetRelid(rel),
10763 : fkattnum,
10764 : numfks,
10765 : numfks,
10766 : InvalidOid, /* not a domain constraint */
10767 : indexOid,
10768 : RelationGetRelid(pkrel),
10769 : pkattnum,
10770 : pfeqoperators,
10771 : ppeqoperators,
10772 : ffeqoperators,
10773 : numfks,
10774 4100 : fkconstraint->fk_upd_action,
10775 4100 : fkconstraint->fk_del_action,
10776 : fkdelsetcols,
10777 : numfkdelsetcols,
10778 4100 : fkconstraint->fk_matchtype,
10779 : NULL, /* no exclusion constraint */
10780 : NULL, /* no check constraint */
10781 : NULL,
10782 : conislocal, /* islocal */
10783 : coninhcount, /* inhcount */
10784 : connoinherit, /* conNoInherit */
10785 : with_period, /* conPeriod */
10786 : is_internal); /* is_internal */
10787 :
10788 4100 : ObjectAddressSet(address, ConstraintRelationId, constrOid);
10789 :
10790 : /*
10791 : * In partitioning cases, create the dependency entries for this
10792 : * constraint. (For non-partitioned cases, relevant entries were created
10793 : * by CreateConstraintEntry.)
10794 : *
10795 : * On the referenced side, we need the constraint to have an internal
10796 : * dependency on its parent constraint; this means that this constraint
10797 : * cannot be dropped on its own -- only through the parent constraint. It
10798 : * also means the containing partition cannot be dropped on its own, but
10799 : * it can be detached, at which point this dependency is removed (after
10800 : * verifying that no rows are referenced via this FK.)
10801 : *
10802 : * When processing the referencing side, we link the constraint via the
10803 : * special partitioning dependencies: the parent constraint is the primary
10804 : * dependent, and the partition on which the foreign key exists is the
10805 : * secondary dependency. That way, this constraint is dropped if either
10806 : * of these objects is.
10807 : *
10808 : * Note that this is only necessary for the subsidiary pg_constraint rows
10809 : * in partitions; the topmost row doesn't need any of this.
10810 : */
10811 4100 : if (OidIsValid(parentConstr))
10812 : {
10813 : ObjectAddress referenced;
10814 :
10815 1976 : ObjectAddressSet(referenced, ConstraintRelationId, parentConstr);
10816 :
10817 : Assert(fkside != addFkBothSides);
10818 1976 : if (fkside == addFkReferencedSide)
10819 1170 : recordDependencyOn(&address, &referenced, DEPENDENCY_INTERNAL);
10820 : else
10821 : {
10822 806 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_PRI);
10823 806 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
10824 806 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_SEC);
10825 : }
10826 : }
10827 :
10828 : /* make new constraint visible, in case we add more */
10829 4100 : CommandCounterIncrement();
10830 :
10831 4100 : return address;
10832 : }
10833 :
10834 : /*
10835 : * addFkRecurseReferenced
10836 : * Recursive helper for the referenced side of foreign key creation,
10837 : * which creates the action triggers and recurses
10838 : *
10839 : * If the referenced relation is a plain relation, create the necessary action
10840 : * triggers that implement the constraint. If the referenced relation is a
10841 : * partitioned table, then we create a pg_constraint row referencing the parent
10842 : * of the referencing side for it and recurse on this routine for each
10843 : * partition.
10844 : *
10845 : * fkconstraint: the constraint being added
10846 : * rel: the root referencing relation
10847 : * pkrel: the referenced relation; might be a partition, if recursing
10848 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10849 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10850 : * top-level constraint
10851 : * numfks: the number of columns in the foreign key
10852 : * pkattnum: the attnum array of referenced attributes
10853 : * fkattnum: the attnum array of referencing attributes
10854 : * numfkdelsetcols: the number of columns in the ON DELETE SET
10855 : * NULL/DEFAULT (...) clause
10856 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10857 : * NULL/DEFAULT clause
10858 : * pf/pp/ffeqoperators: OID array of operators between columns
10859 : * old_check_ok: true if this constraint replaces an existing one that
10860 : * was already validated (thus this one doesn't need validation)
10861 : * parentDelTrigger and parentUpdTrigger: when recursively called on a
10862 : * partition, the OIDs of the parent action triggers for DELETE and
10863 : * UPDATE respectively.
10864 : * with_period: true if this is a temporal FK
10865 : */
10866 : static void
10867 3396 : addFkRecurseReferenced(Constraint *fkconstraint, Relation rel,
10868 : Relation pkrel, Oid indexOid, Oid parentConstr,
10869 : int numfks,
10870 : int16 *pkattnum, int16 *fkattnum, Oid *pfeqoperators,
10871 : Oid *ppeqoperators, Oid *ffeqoperators,
10872 : int numfkdelsetcols, int16 *fkdelsetcols,
10873 : bool old_check_ok,
10874 : Oid parentDelTrigger, Oid parentUpdTrigger,
10875 : bool with_period)
10876 : {
10877 3396 : Oid deleteTriggerOid = InvalidOid,
10878 3396 : updateTriggerOid = InvalidOid;
10879 :
10880 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
10881 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
10882 :
10883 : /*
10884 : * Create action triggers to enforce the constraint, or skip them if the
10885 : * constraint is NOT ENFORCED.
10886 : */
10887 3396 : if (fkconstraint->is_enforced)
10888 3348 : createForeignKeyActionTriggers(RelationGetRelid(rel),
10889 : RelationGetRelid(pkrel),
10890 : fkconstraint,
10891 : parentConstr, indexOid,
10892 : parentDelTrigger, parentUpdTrigger,
10893 : &deleteTriggerOid, &updateTriggerOid);
10894 :
10895 : /*
10896 : * If the referenced table is partitioned, recurse on ourselves to handle
10897 : * each partition. We need one pg_constraint row created for each
10898 : * partition in addition to the pg_constraint row for the parent table.
10899 : */
10900 3396 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10901 : {
10902 558 : PartitionDesc pd = RelationGetPartitionDesc(pkrel, true);
10903 :
10904 1506 : for (int i = 0; i < pd->nparts; i++)
10905 : {
10906 : Relation partRel;
10907 : AttrMap *map;
10908 : AttrNumber *mapped_pkattnum;
10909 : Oid partIndexId;
10910 : ObjectAddress address;
10911 :
10912 : /* XXX would it be better to acquire these locks beforehand? */
10913 948 : partRel = table_open(pd->oids[i], ShareRowExclusiveLock);
10914 :
10915 : /*
10916 : * Map the attribute numbers in the referenced side of the FK
10917 : * definition to match the partition's column layout.
10918 : */
10919 948 : map = build_attrmap_by_name_if_req(RelationGetDescr(partRel),
10920 : RelationGetDescr(pkrel),
10921 : false);
10922 948 : if (map)
10923 : {
10924 136 : mapped_pkattnum = palloc(sizeof(AttrNumber) * numfks);
10925 284 : for (int j = 0; j < numfks; j++)
10926 148 : mapped_pkattnum[j] = map->attnums[pkattnum[j] - 1];
10927 : }
10928 : else
10929 812 : mapped_pkattnum = pkattnum;
10930 :
10931 : /* Determine the index to use at this level */
10932 948 : partIndexId = index_get_partition(partRel, indexOid);
10933 948 : if (!OidIsValid(partIndexId))
10934 0 : elog(ERROR, "index for %u not found in partition %s",
10935 : indexOid, RelationGetRelationName(partRel));
10936 :
10937 : /* Create entry at this level ... */
10938 948 : address = addFkConstraint(addFkReferencedSide,
10939 : fkconstraint->conname, fkconstraint, rel,
10940 : partRel, partIndexId, parentConstr,
10941 : numfks, mapped_pkattnum,
10942 : fkattnum, pfeqoperators, ppeqoperators,
10943 : ffeqoperators, numfkdelsetcols,
10944 : fkdelsetcols, true, with_period);
10945 : /* ... and recurse to our children */
10946 948 : addFkRecurseReferenced(fkconstraint, rel, partRel,
10947 : partIndexId, address.objectId, numfks,
10948 : mapped_pkattnum, fkattnum,
10949 : pfeqoperators, ppeqoperators, ffeqoperators,
10950 : numfkdelsetcols, fkdelsetcols,
10951 : old_check_ok,
10952 : deleteTriggerOid, updateTriggerOid,
10953 : with_period);
10954 :
10955 : /* Done -- clean up (but keep the lock) */
10956 948 : table_close(partRel, NoLock);
10957 948 : if (map)
10958 : {
10959 136 : pfree(mapped_pkattnum);
10960 136 : free_attrmap(map);
10961 : }
10962 : }
10963 : }
10964 3396 : }
10965 :
10966 : /*
10967 : * addFkRecurseReferencing
10968 : * Recursive helper for the referencing side of foreign key creation,
10969 : * which creates the check triggers and recurses
10970 : *
10971 : * If the referencing relation is a plain relation, create the necessary check
10972 : * triggers that implement the constraint, and set up for Phase 3 constraint
10973 : * verification. If the referencing relation is a partitioned table, then
10974 : * we create a pg_constraint row for it and recurse on this routine for each
10975 : * partition.
10976 : *
10977 : * We assume that the referenced relation is locked against concurrent
10978 : * deletions. If it's a partitioned relation, every partition must be so
10979 : * locked.
10980 : *
10981 : * wqueue: the ALTER TABLE work queue; NULL when not running as part
10982 : * of an ALTER TABLE sequence.
10983 : * fkconstraint: the constraint being added
10984 : * rel: the referencing relation; might be a partition, if recursing
10985 : * pkrel: the root referenced relation
10986 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10987 : * parentConstr: the OID of the parent constraint (there is always one)
10988 : * numfks: the number of columns in the foreign key
10989 : * pkattnum: the attnum array of referenced attributes
10990 : * fkattnum: the attnum array of referencing attributes
10991 : * pf/pp/ffeqoperators: OID array of operators between columns
10992 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10993 : * (...) clause
10994 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10995 : * NULL/DEFAULT clause
10996 : * old_check_ok: true if this constraint replaces an existing one that
10997 : * was already validated (thus this one doesn't need validation)
10998 : * lockmode: the lockmode to acquire on partitions when recursing
10999 : * parentInsTrigger and parentUpdTrigger: when being recursively called on
11000 : * a partition, the OIDs of the parent check triggers for INSERT and
11001 : * UPDATE respectively.
11002 : * with_period: true if this is a temporal FK
11003 : */
11004 : static void
11005 2930 : addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint, Relation rel,
11006 : Relation pkrel, Oid indexOid, Oid parentConstr,
11007 : int numfks, int16 *pkattnum, int16 *fkattnum,
11008 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
11009 : int numfkdelsetcols, int16 *fkdelsetcols,
11010 : bool old_check_ok, LOCKMODE lockmode,
11011 : Oid parentInsTrigger, Oid parentUpdTrigger,
11012 : bool with_period)
11013 : {
11014 2930 : Oid insertTriggerOid = InvalidOid,
11015 2930 : updateTriggerOid = InvalidOid;
11016 :
11017 : Assert(OidIsValid(parentConstr));
11018 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
11019 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
11020 :
11021 2930 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11022 0 : ereport(ERROR,
11023 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11024 : errmsg("foreign key constraints are not supported on foreign tables")));
11025 :
11026 : /*
11027 : * Add check triggers if the constraint is ENFORCED, and if needed,
11028 : * schedule them to be checked in Phase 3.
11029 : *
11030 : * If the relation is partitioned, drill down to do it to its partitions.
11031 : */
11032 2930 : if (fkconstraint->is_enforced)
11033 2888 : createForeignKeyCheckTriggers(RelationGetRelid(rel),
11034 : RelationGetRelid(pkrel),
11035 : fkconstraint,
11036 : parentConstr,
11037 : indexOid,
11038 : parentInsTrigger, parentUpdTrigger,
11039 : &insertTriggerOid, &updateTriggerOid);
11040 :
11041 2930 : if (rel->rd_rel->relkind == RELKIND_RELATION)
11042 : {
11043 : /*
11044 : * Tell Phase 3 to check that the constraint is satisfied by existing
11045 : * rows. We can skip this during table creation, when constraint is
11046 : * specified as NOT ENFORCED, or when requested explicitly by
11047 : * specifying NOT VALID in an ADD FOREIGN KEY command, and when we're
11048 : * recreating a constraint following a SET DATA TYPE operation that
11049 : * did not impugn its validity.
11050 : */
11051 2446 : if (wqueue && !old_check_ok && !fkconstraint->skip_validation &&
11052 772 : fkconstraint->is_enforced)
11053 : {
11054 : NewConstraint *newcon;
11055 : AlteredTableInfo *tab;
11056 :
11057 772 : tab = ATGetQueueEntry(wqueue, rel);
11058 :
11059 772 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
11060 772 : newcon->name = get_constraint_name(parentConstr);
11061 772 : newcon->contype = CONSTR_FOREIGN;
11062 772 : newcon->refrelid = RelationGetRelid(pkrel);
11063 772 : newcon->refindid = indexOid;
11064 772 : newcon->conid = parentConstr;
11065 772 : newcon->conwithperiod = fkconstraint->fk_with_period;
11066 772 : newcon->qual = (Node *) fkconstraint;
11067 :
11068 772 : tab->constraints = lappend(tab->constraints, newcon);
11069 : }
11070 : }
11071 484 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11072 : {
11073 484 : PartitionDesc pd = RelationGetPartitionDesc(rel, true);
11074 : Relation trigrel;
11075 :
11076 : /*
11077 : * Triggers of the foreign keys will be manipulated a bunch of times
11078 : * in the loop below. To avoid repeatedly opening/closing the trigger
11079 : * catalog relation, we open it here and pass it to the subroutines
11080 : * called below.
11081 : */
11082 484 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11083 :
11084 : /*
11085 : * Recurse to take appropriate action on each partition; either we
11086 : * find an existing constraint to reparent to ours, or we create a new
11087 : * one.
11088 : */
11089 866 : for (int i = 0; i < pd->nparts; i++)
11090 : {
11091 388 : Relation partition = table_open(pd->oids[i], lockmode);
11092 : List *partFKs;
11093 : AttrMap *attmap;
11094 : AttrNumber mapped_fkattnum[INDEX_MAX_KEYS];
11095 : bool attached;
11096 : ObjectAddress address;
11097 :
11098 388 : CheckAlterTableIsSafe(partition);
11099 :
11100 382 : attmap = build_attrmap_by_name(RelationGetDescr(partition),
11101 : RelationGetDescr(rel),
11102 : false);
11103 986 : for (int j = 0; j < numfks; j++)
11104 604 : mapped_fkattnum[j] = attmap->attnums[fkattnum[j] - 1];
11105 :
11106 : /* Check whether an existing constraint can be repurposed */
11107 382 : partFKs = copyObject(RelationGetFKeyList(partition));
11108 382 : attached = false;
11109 782 : foreach_node(ForeignKeyCacheInfo, fk, partFKs)
11110 : {
11111 30 : if (tryAttachPartitionForeignKey(wqueue,
11112 : fk,
11113 : partition,
11114 : parentConstr,
11115 : numfks,
11116 : mapped_fkattnum,
11117 : pkattnum,
11118 : pfeqoperators,
11119 : insertTriggerOid,
11120 : updateTriggerOid,
11121 : trigrel))
11122 : {
11123 12 : attached = true;
11124 12 : break;
11125 : }
11126 : }
11127 382 : if (attached)
11128 : {
11129 12 : table_close(partition, NoLock);
11130 12 : continue;
11131 : }
11132 :
11133 : /*
11134 : * No luck finding a good constraint to reuse; create our own.
11135 : */
11136 370 : address = addFkConstraint(addFkReferencingSide,
11137 : fkconstraint->conname, fkconstraint,
11138 : partition, pkrel, indexOid, parentConstr,
11139 : numfks, pkattnum,
11140 : mapped_fkattnum, pfeqoperators,
11141 : ppeqoperators, ffeqoperators,
11142 : numfkdelsetcols, fkdelsetcols, true,
11143 : with_period);
11144 :
11145 : /* call ourselves to finalize the creation and we're done */
11146 370 : addFkRecurseReferencing(wqueue, fkconstraint, partition, pkrel,
11147 : indexOid,
11148 : address.objectId,
11149 : numfks,
11150 : pkattnum,
11151 : mapped_fkattnum,
11152 : pfeqoperators,
11153 : ppeqoperators,
11154 : ffeqoperators,
11155 : numfkdelsetcols,
11156 : fkdelsetcols,
11157 : old_check_ok,
11158 : lockmode,
11159 : insertTriggerOid,
11160 : updateTriggerOid,
11161 : with_period);
11162 :
11163 370 : table_close(partition, NoLock);
11164 : }
11165 :
11166 478 : table_close(trigrel, RowExclusiveLock);
11167 : }
11168 2924 : }
11169 :
11170 : /*
11171 : * CloneForeignKeyConstraints
11172 : * Clone foreign keys from a partitioned table to a newly acquired
11173 : * partition.
11174 : *
11175 : * partitionRel is a partition of parentRel, so we can be certain that it has
11176 : * the same columns with the same datatypes. The columns may be in different
11177 : * order, though.
11178 : *
11179 : * wqueue must be passed to set up phase 3 constraint checking, unless the
11180 : * referencing-side partition is known to be empty (such as in CREATE TABLE /
11181 : * PARTITION OF).
11182 : */
11183 : static void
11184 9830 : CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
11185 : Relation partitionRel)
11186 : {
11187 : /* This only works for declarative partitioning */
11188 : Assert(parentRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
11189 :
11190 : /*
11191 : * First, clone constraints where the parent is on the referencing side.
11192 : */
11193 9830 : CloneFkReferencing(wqueue, parentRel, partitionRel);
11194 :
11195 : /*
11196 : * Clone constraints for which the parent is on the referenced side.
11197 : */
11198 9812 : CloneFkReferenced(parentRel, partitionRel);
11199 9812 : }
11200 :
11201 : /*
11202 : * CloneFkReferenced
11203 : * Subroutine for CloneForeignKeyConstraints
11204 : *
11205 : * Find all the FKs that have the parent relation on the referenced side;
11206 : * clone those constraints to the given partition. This is to be called
11207 : * when the partition is being created or attached.
11208 : *
11209 : * This recurses to partitions, if the relation being attached is partitioned.
11210 : * Recursion is done by calling addFkRecurseReferenced.
11211 : */
11212 : static void
11213 9812 : CloneFkReferenced(Relation parentRel, Relation partitionRel)
11214 : {
11215 : Relation pg_constraint;
11216 : AttrMap *attmap;
11217 : ListCell *cell;
11218 : SysScanDesc scan;
11219 : ScanKeyData key[2];
11220 : HeapTuple tuple;
11221 9812 : List *clone = NIL;
11222 : Relation trigrel;
11223 :
11224 : /*
11225 : * Search for any constraints where this partition's parent is in the
11226 : * referenced side. However, we must not clone any constraint whose
11227 : * parent constraint is also going to be cloned, to avoid duplicates. So
11228 : * do it in two steps: first construct the list of constraints to clone,
11229 : * then go over that list cloning those whose parents are not in the list.
11230 : * (We must not rely on the parent being seen first, since the catalog
11231 : * scan could return children first.)
11232 : */
11233 9812 : pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11234 9812 : ScanKeyInit(&key[0],
11235 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
11236 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parentRel)));
11237 9812 : ScanKeyInit(&key[1],
11238 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
11239 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
11240 : /* This is a seqscan, as we don't have a usable index ... */
11241 9812 : scan = systable_beginscan(pg_constraint, InvalidOid, true,
11242 : NULL, 2, key);
11243 10256 : while ((tuple = systable_getnext(scan)) != NULL)
11244 : {
11245 444 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11246 :
11247 444 : clone = lappend_oid(clone, constrForm->oid);
11248 : }
11249 9812 : systable_endscan(scan);
11250 9812 : table_close(pg_constraint, RowShareLock);
11251 :
11252 : /*
11253 : * Triggers of the foreign keys will be manipulated a bunch of times in
11254 : * the loop below. To avoid repeatedly opening/closing the trigger
11255 : * catalog relation, we open it here and pass it to the subroutines called
11256 : * below.
11257 : */
11258 9812 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11259 :
11260 9812 : attmap = build_attrmap_by_name(RelationGetDescr(partitionRel),
11261 : RelationGetDescr(parentRel),
11262 : false);
11263 10256 : foreach(cell, clone)
11264 : {
11265 444 : Oid constrOid = lfirst_oid(cell);
11266 : Form_pg_constraint constrForm;
11267 : Relation fkRel;
11268 : Oid indexOid;
11269 : Oid partIndexId;
11270 : int numfks;
11271 : AttrNumber conkey[INDEX_MAX_KEYS];
11272 : AttrNumber mapped_confkey[INDEX_MAX_KEYS];
11273 : AttrNumber confkey[INDEX_MAX_KEYS];
11274 : Oid conpfeqop[INDEX_MAX_KEYS];
11275 : Oid conppeqop[INDEX_MAX_KEYS];
11276 : Oid conffeqop[INDEX_MAX_KEYS];
11277 : int numfkdelsetcols;
11278 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11279 : Constraint *fkconstraint;
11280 : ObjectAddress address;
11281 444 : Oid deleteTriggerOid = InvalidOid,
11282 444 : updateTriggerOid = InvalidOid;
11283 :
11284 444 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
11285 444 : if (!HeapTupleIsValid(tuple))
11286 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
11287 444 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11288 :
11289 : /*
11290 : * As explained above: don't try to clone a constraint for which we're
11291 : * going to clone the parent.
11292 : */
11293 444 : if (list_member_oid(clone, constrForm->conparentid))
11294 : {
11295 222 : ReleaseSysCache(tuple);
11296 222 : continue;
11297 : }
11298 :
11299 : /* We need the same lock level that CreateTrigger will acquire */
11300 222 : fkRel = table_open(constrForm->conrelid, ShareRowExclusiveLock);
11301 :
11302 222 : indexOid = constrForm->conindid;
11303 222 : DeconstructFkConstraintRow(tuple,
11304 : &numfks,
11305 : conkey,
11306 : confkey,
11307 : conpfeqop,
11308 : conppeqop,
11309 : conffeqop,
11310 : &numfkdelsetcols,
11311 : confdelsetcols);
11312 :
11313 486 : for (int i = 0; i < numfks; i++)
11314 264 : mapped_confkey[i] = attmap->attnums[confkey[i] - 1];
11315 :
11316 222 : fkconstraint = makeNode(Constraint);
11317 222 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11318 222 : fkconstraint->conname = NameStr(constrForm->conname);
11319 222 : fkconstraint->deferrable = constrForm->condeferrable;
11320 222 : fkconstraint->initdeferred = constrForm->condeferred;
11321 222 : fkconstraint->location = -1;
11322 222 : fkconstraint->pktable = NULL;
11323 : /* ->fk_attrs determined below */
11324 222 : fkconstraint->pk_attrs = NIL;
11325 222 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11326 222 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11327 222 : fkconstraint->fk_del_action = constrForm->confdeltype;
11328 222 : fkconstraint->fk_del_set_cols = NIL;
11329 222 : fkconstraint->old_conpfeqop = NIL;
11330 222 : fkconstraint->old_pktable_oid = InvalidOid;
11331 222 : fkconstraint->is_enforced = constrForm->conenforced;
11332 222 : fkconstraint->skip_validation = false;
11333 222 : fkconstraint->initially_valid = constrForm->convalidated;
11334 :
11335 : /* set up colnames that are used to generate the constraint name */
11336 486 : for (int i = 0; i < numfks; i++)
11337 : {
11338 : Form_pg_attribute att;
11339 :
11340 264 : att = TupleDescAttr(RelationGetDescr(fkRel),
11341 264 : conkey[i] - 1);
11342 264 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11343 264 : makeString(NameStr(att->attname)));
11344 : }
11345 :
11346 : /*
11347 : * Add the new foreign key constraint pointing to the new partition.
11348 : * Because this new partition appears in the referenced side of the
11349 : * constraint, we don't need to set up for Phase 3 check.
11350 : */
11351 222 : partIndexId = index_get_partition(partitionRel, indexOid);
11352 222 : if (!OidIsValid(partIndexId))
11353 0 : elog(ERROR, "index for %u not found in partition %s",
11354 : indexOid, RelationGetRelationName(partitionRel));
11355 :
11356 : /*
11357 : * Get the "action" triggers belonging to the constraint to pass as
11358 : * parent OIDs for similar triggers that will be created on the
11359 : * partition in addFkRecurseReferenced().
11360 : */
11361 222 : if (constrForm->conenforced)
11362 222 : GetForeignKeyActionTriggers(trigrel, constrOid,
11363 : constrForm->confrelid, constrForm->conrelid,
11364 : &deleteTriggerOid, &updateTriggerOid);
11365 :
11366 : /* Add this constraint ... */
11367 222 : address = addFkConstraint(addFkReferencedSide,
11368 : fkconstraint->conname, fkconstraint, fkRel,
11369 : partitionRel, partIndexId, constrOid,
11370 : numfks, mapped_confkey,
11371 : conkey, conpfeqop, conppeqop, conffeqop,
11372 : numfkdelsetcols, confdelsetcols, false,
11373 222 : constrForm->conperiod);
11374 : /* ... and recurse */
11375 222 : addFkRecurseReferenced(fkconstraint,
11376 : fkRel,
11377 : partitionRel,
11378 : partIndexId,
11379 : address.objectId,
11380 : numfks,
11381 : mapped_confkey,
11382 : conkey,
11383 : conpfeqop,
11384 : conppeqop,
11385 : conffeqop,
11386 : numfkdelsetcols,
11387 : confdelsetcols,
11388 : true,
11389 : deleteTriggerOid,
11390 : updateTriggerOid,
11391 222 : constrForm->conperiod);
11392 :
11393 222 : table_close(fkRel, NoLock);
11394 222 : ReleaseSysCache(tuple);
11395 : }
11396 :
11397 9812 : table_close(trigrel, RowExclusiveLock);
11398 9812 : }
11399 :
11400 : /*
11401 : * CloneFkReferencing
11402 : * Subroutine for CloneForeignKeyConstraints
11403 : *
11404 : * For each FK constraint of the parent relation in the given list, find an
11405 : * equivalent constraint in its partition relation that can be reparented;
11406 : * if one cannot be found, create a new constraint in the partition as its
11407 : * child.
11408 : *
11409 : * If wqueue is given, it is used to set up phase-3 verification for each
11410 : * cloned constraint; omit it if such verification is not needed
11411 : * (example: the partition is being created anew).
11412 : */
11413 : static void
11414 9830 : CloneFkReferencing(List **wqueue, Relation parentRel, Relation partRel)
11415 : {
11416 : AttrMap *attmap;
11417 : List *partFKs;
11418 9830 : List *clone = NIL;
11419 : ListCell *cell;
11420 : Relation trigrel;
11421 :
11422 : /* obtain a list of constraints that we need to clone */
11423 11146 : foreach(cell, RelationGetFKeyList(parentRel))
11424 : {
11425 1322 : ForeignKeyCacheInfo *fk = lfirst(cell);
11426 :
11427 : /*
11428 : * Refuse to attach a table as partition that this partitioned table
11429 : * already has a foreign key to. This isn't useful schema, which is
11430 : * proven by the fact that there have been no user complaints that
11431 : * it's already impossible to achieve this in the opposite direction,
11432 : * i.e., creating a foreign key that references a partition. This
11433 : * restriction allows us to dodge some complexities around
11434 : * pg_constraint and pg_trigger row creations that would be needed
11435 : * during ATTACH/DETACH for this kind of relationship.
11436 : */
11437 1322 : if (fk->confrelid == RelationGetRelid(partRel))
11438 6 : ereport(ERROR,
11439 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
11440 : errmsg("cannot attach table \"%s\" as a partition because it is referenced by foreign key \"%s\"",
11441 : RelationGetRelationName(partRel),
11442 : get_constraint_name(fk->conoid))));
11443 :
11444 1316 : clone = lappend_oid(clone, fk->conoid);
11445 : }
11446 :
11447 : /*
11448 : * Silently do nothing if there's nothing to do. In particular, this
11449 : * avoids throwing a spurious error for foreign tables.
11450 : */
11451 9824 : if (clone == NIL)
11452 9268 : return;
11453 :
11454 556 : if (partRel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11455 0 : ereport(ERROR,
11456 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11457 : errmsg("foreign key constraints are not supported on foreign tables")));
11458 :
11459 : /*
11460 : * Triggers of the foreign keys will be manipulated a bunch of times in
11461 : * the loop below. To avoid repeatedly opening/closing the trigger
11462 : * catalog relation, we open it here and pass it to the subroutines called
11463 : * below.
11464 : */
11465 556 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11466 :
11467 : /*
11468 : * The constraint key may differ, if the columns in the partition are
11469 : * different. This map is used to convert them.
11470 : */
11471 556 : attmap = build_attrmap_by_name(RelationGetDescr(partRel),
11472 : RelationGetDescr(parentRel),
11473 : false);
11474 :
11475 556 : partFKs = copyObject(RelationGetFKeyList(partRel));
11476 :
11477 1860 : foreach(cell, clone)
11478 : {
11479 1316 : Oid parentConstrOid = lfirst_oid(cell);
11480 : Form_pg_constraint constrForm;
11481 : Relation pkrel;
11482 : HeapTuple tuple;
11483 : int numfks;
11484 : AttrNumber conkey[INDEX_MAX_KEYS];
11485 : AttrNumber mapped_conkey[INDEX_MAX_KEYS];
11486 : AttrNumber confkey[INDEX_MAX_KEYS];
11487 : Oid conpfeqop[INDEX_MAX_KEYS];
11488 : Oid conppeqop[INDEX_MAX_KEYS];
11489 : Oid conffeqop[INDEX_MAX_KEYS];
11490 : int numfkdelsetcols;
11491 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11492 : Constraint *fkconstraint;
11493 : bool attached;
11494 : Oid indexOid;
11495 : ObjectAddress address;
11496 : ListCell *lc;
11497 1316 : Oid insertTriggerOid = InvalidOid,
11498 1316 : updateTriggerOid = InvalidOid;
11499 : bool with_period;
11500 :
11501 1316 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parentConstrOid));
11502 1316 : if (!HeapTupleIsValid(tuple))
11503 0 : elog(ERROR, "cache lookup failed for constraint %u",
11504 : parentConstrOid);
11505 1316 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11506 :
11507 : /* Don't clone constraints whose parents are being cloned */
11508 1316 : if (list_member_oid(clone, constrForm->conparentid))
11509 : {
11510 724 : ReleaseSysCache(tuple);
11511 874 : continue;
11512 : }
11513 :
11514 : /*
11515 : * Need to prevent concurrent deletions. If pkrel is a partitioned
11516 : * relation, that means to lock all partitions.
11517 : */
11518 592 : pkrel = table_open(constrForm->confrelid, ShareRowExclusiveLock);
11519 592 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11520 250 : (void) find_all_inheritors(RelationGetRelid(pkrel),
11521 : ShareRowExclusiveLock, NULL);
11522 :
11523 592 : DeconstructFkConstraintRow(tuple, &numfks, conkey, confkey,
11524 : conpfeqop, conppeqop, conffeqop,
11525 : &numfkdelsetcols, confdelsetcols);
11526 1418 : for (int i = 0; i < numfks; i++)
11527 826 : mapped_conkey[i] = attmap->attnums[conkey[i] - 1];
11528 :
11529 : /*
11530 : * Get the "check" triggers belonging to the constraint, if it is
11531 : * ENFORCED, to pass as parent OIDs for similar triggers that will be
11532 : * created on the partition in addFkRecurseReferencing(). They are
11533 : * also passed to tryAttachPartitionForeignKey() below to simply
11534 : * assign as parents to the partition's existing "check" triggers,
11535 : * that is, if the corresponding constraints is deemed attachable to
11536 : * the parent constraint.
11537 : */
11538 592 : if (constrForm->conenforced)
11539 580 : GetForeignKeyCheckTriggers(trigrel, constrForm->oid,
11540 : constrForm->confrelid, constrForm->conrelid,
11541 : &insertTriggerOid, &updateTriggerOid);
11542 :
11543 : /*
11544 : * Before creating a new constraint, see whether any existing FKs are
11545 : * fit for the purpose. If one is, attach the parent constraint to
11546 : * it, and don't clone anything. This way we avoid the expensive
11547 : * verification step and don't end up with a duplicate FK, and we
11548 : * don't need to recurse to partitions for this constraint.
11549 : */
11550 592 : attached = false;
11551 682 : foreach(lc, partFKs)
11552 : {
11553 246 : ForeignKeyCacheInfo *fk = lfirst_node(ForeignKeyCacheInfo, lc);
11554 :
11555 246 : if (tryAttachPartitionForeignKey(wqueue,
11556 : fk,
11557 : partRel,
11558 : parentConstrOid,
11559 : numfks,
11560 : mapped_conkey,
11561 : confkey,
11562 : conpfeqop,
11563 : insertTriggerOid,
11564 : updateTriggerOid,
11565 : trigrel))
11566 : {
11567 150 : attached = true;
11568 150 : table_close(pkrel, NoLock);
11569 150 : break;
11570 : }
11571 : }
11572 586 : if (attached)
11573 : {
11574 150 : ReleaseSysCache(tuple);
11575 150 : continue;
11576 : }
11577 :
11578 : /* No dice. Set up to create our own constraint */
11579 436 : fkconstraint = makeNode(Constraint);
11580 436 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11581 : /* ->conname determined below */
11582 436 : fkconstraint->deferrable = constrForm->condeferrable;
11583 436 : fkconstraint->initdeferred = constrForm->condeferred;
11584 436 : fkconstraint->location = -1;
11585 436 : fkconstraint->pktable = NULL;
11586 : /* ->fk_attrs determined below */
11587 436 : fkconstraint->pk_attrs = NIL;
11588 436 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11589 436 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11590 436 : fkconstraint->fk_del_action = constrForm->confdeltype;
11591 436 : fkconstraint->fk_del_set_cols = NIL;
11592 436 : fkconstraint->old_conpfeqop = NIL;
11593 436 : fkconstraint->old_pktable_oid = InvalidOid;
11594 436 : fkconstraint->is_enforced = constrForm->conenforced;
11595 436 : fkconstraint->skip_validation = false;
11596 436 : fkconstraint->initially_valid = constrForm->convalidated;
11597 992 : for (int i = 0; i < numfks; i++)
11598 : {
11599 : Form_pg_attribute att;
11600 :
11601 556 : att = TupleDescAttr(RelationGetDescr(partRel),
11602 556 : mapped_conkey[i] - 1);
11603 556 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11604 556 : makeString(NameStr(att->attname)));
11605 : }
11606 :
11607 436 : indexOid = constrForm->conindid;
11608 436 : with_period = constrForm->conperiod;
11609 :
11610 : /* Create the pg_constraint entry at this level */
11611 436 : address = addFkConstraint(addFkReferencingSide,
11612 436 : NameStr(constrForm->conname), fkconstraint,
11613 : partRel, pkrel, indexOid, parentConstrOid,
11614 : numfks, confkey,
11615 : mapped_conkey, conpfeqop,
11616 : conppeqop, conffeqop,
11617 : numfkdelsetcols, confdelsetcols,
11618 : false, with_period);
11619 :
11620 : /* Done with the cloned constraint's tuple */
11621 436 : ReleaseSysCache(tuple);
11622 :
11623 : /* Create the check triggers, and recurse to partitions, if any */
11624 436 : addFkRecurseReferencing(wqueue,
11625 : fkconstraint,
11626 : partRel,
11627 : pkrel,
11628 : indexOid,
11629 : address.objectId,
11630 : numfks,
11631 : confkey,
11632 : mapped_conkey,
11633 : conpfeqop,
11634 : conppeqop,
11635 : conffeqop,
11636 : numfkdelsetcols,
11637 : confdelsetcols,
11638 : false, /* no old check exists */
11639 : AccessExclusiveLock,
11640 : insertTriggerOid,
11641 : updateTriggerOid,
11642 : with_period);
11643 430 : table_close(pkrel, NoLock);
11644 : }
11645 :
11646 544 : table_close(trigrel, RowExclusiveLock);
11647 : }
11648 :
11649 : /*
11650 : * When the parent of a partition receives [the referencing side of] a foreign
11651 : * key, we must propagate that foreign key to the partition. However, the
11652 : * partition might already have an equivalent foreign key; this routine
11653 : * compares the given ForeignKeyCacheInfo (in the partition) to the FK defined
11654 : * by the other parameters. If they are equivalent, create the link between
11655 : * the two constraints and return true.
11656 : *
11657 : * If the given FK does not match the one defined by rest of the params,
11658 : * return false.
11659 : */
11660 : static bool
11661 276 : tryAttachPartitionForeignKey(List **wqueue,
11662 : ForeignKeyCacheInfo *fk,
11663 : Relation partition,
11664 : Oid parentConstrOid,
11665 : int numfks,
11666 : AttrNumber *mapped_conkey,
11667 : AttrNumber *confkey,
11668 : Oid *conpfeqop,
11669 : Oid parentInsTrigger,
11670 : Oid parentUpdTrigger,
11671 : Relation trigrel)
11672 : {
11673 : HeapTuple parentConstrTup;
11674 : Form_pg_constraint parentConstr;
11675 : HeapTuple partcontup;
11676 : Form_pg_constraint partConstr;
11677 :
11678 276 : parentConstrTup = SearchSysCache1(CONSTROID,
11679 : ObjectIdGetDatum(parentConstrOid));
11680 276 : if (!HeapTupleIsValid(parentConstrTup))
11681 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11682 276 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11683 :
11684 : /*
11685 : * Do some quick & easy initial checks. If any of these fail, we cannot
11686 : * use this constraint.
11687 : */
11688 276 : if (fk->confrelid != parentConstr->confrelid || fk->nkeys != numfks)
11689 : {
11690 0 : ReleaseSysCache(parentConstrTup);
11691 0 : return false;
11692 : }
11693 768 : for (int i = 0; i < numfks; i++)
11694 : {
11695 492 : if (fk->conkey[i] != mapped_conkey[i] ||
11696 492 : fk->confkey[i] != confkey[i] ||
11697 492 : fk->conpfeqop[i] != conpfeqop[i])
11698 : {
11699 0 : ReleaseSysCache(parentConstrTup);
11700 0 : return false;
11701 : }
11702 : }
11703 :
11704 : /* Looks good so far; perform more extensive checks. */
11705 276 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
11706 276 : if (!HeapTupleIsValid(partcontup))
11707 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
11708 276 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11709 :
11710 : /*
11711 : * An error should be raised if the constraint enforceability is
11712 : * different. Returning false without raising an error, as we do for other
11713 : * attributes, could lead to a duplicate constraint with the same
11714 : * enforceability as the parent. While this may be acceptable, it may not
11715 : * be ideal. Therefore, it's better to raise an error and allow the user
11716 : * to correct the enforceability before proceeding.
11717 : */
11718 276 : if (partConstr->conenforced != parentConstr->conenforced)
11719 6 : ereport(ERROR,
11720 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
11721 : errmsg("constraint \"%s\" enforceability conflicts with constraint \"%s\" on relation \"%s\"",
11722 : NameStr(parentConstr->conname),
11723 : NameStr(partConstr->conname),
11724 : RelationGetRelationName(partition))));
11725 :
11726 270 : if (OidIsValid(partConstr->conparentid) ||
11727 240 : partConstr->condeferrable != parentConstr->condeferrable ||
11728 212 : partConstr->condeferred != parentConstr->condeferred ||
11729 212 : partConstr->confupdtype != parentConstr->confupdtype ||
11730 176 : partConstr->confdeltype != parentConstr->confdeltype ||
11731 176 : partConstr->confmatchtype != parentConstr->confmatchtype)
11732 : {
11733 108 : ReleaseSysCache(parentConstrTup);
11734 108 : ReleaseSysCache(partcontup);
11735 108 : return false;
11736 : }
11737 :
11738 162 : ReleaseSysCache(parentConstrTup);
11739 162 : ReleaseSysCache(partcontup);
11740 :
11741 : /* Looks good! Attach this constraint. */
11742 162 : AttachPartitionForeignKey(wqueue, partition, fk->conoid,
11743 : parentConstrOid, parentInsTrigger,
11744 : parentUpdTrigger, trigrel);
11745 :
11746 162 : return true;
11747 : }
11748 :
11749 : /*
11750 : * AttachPartitionForeignKey
11751 : *
11752 : * The subroutine for tryAttachPartitionForeignKey performs the final tasks of
11753 : * attaching the constraint, removing redundant triggers and entries from
11754 : * pg_constraint, and setting the constraint's parent.
11755 : */
11756 : static void
11757 162 : AttachPartitionForeignKey(List **wqueue,
11758 : Relation partition,
11759 : Oid partConstrOid,
11760 : Oid parentConstrOid,
11761 : Oid parentInsTrigger,
11762 : Oid parentUpdTrigger,
11763 : Relation trigrel)
11764 : {
11765 : HeapTuple parentConstrTup;
11766 : Form_pg_constraint parentConstr;
11767 : HeapTuple partcontup;
11768 : Form_pg_constraint partConstr;
11769 : bool queueValidation;
11770 : Oid partConstrFrelid;
11771 : Oid partConstrRelid;
11772 : bool parentConstrIsEnforced;
11773 :
11774 : /* Fetch the parent constraint tuple */
11775 162 : parentConstrTup = SearchSysCache1(CONSTROID,
11776 : ObjectIdGetDatum(parentConstrOid));
11777 162 : if (!HeapTupleIsValid(parentConstrTup))
11778 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11779 162 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11780 162 : parentConstrIsEnforced = parentConstr->conenforced;
11781 :
11782 : /* Fetch the child constraint tuple */
11783 162 : partcontup = SearchSysCache1(CONSTROID,
11784 : ObjectIdGetDatum(partConstrOid));
11785 162 : if (!HeapTupleIsValid(partcontup))
11786 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11787 162 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11788 162 : partConstrFrelid = partConstr->confrelid;
11789 162 : partConstrRelid = partConstr->conrelid;
11790 :
11791 : /*
11792 : * If the referenced table is partitioned, then the partition we're
11793 : * attaching now has extra pg_constraint rows and action triggers that are
11794 : * no longer needed. Remove those.
11795 : */
11796 162 : if (get_rel_relkind(partConstrFrelid) == RELKIND_PARTITIONED_TABLE)
11797 : {
11798 36 : Relation pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11799 :
11800 36 : RemoveInheritedConstraint(pg_constraint, trigrel, partConstrOid,
11801 : partConstrRelid);
11802 :
11803 36 : table_close(pg_constraint, RowShareLock);
11804 : }
11805 :
11806 : /*
11807 : * Will we need to validate this constraint? A valid parent constraint
11808 : * implies that all child constraints have been validated, so if this one
11809 : * isn't, we must trigger phase 3 validation.
11810 : */
11811 162 : queueValidation = parentConstr->convalidated && !partConstr->convalidated;
11812 :
11813 162 : ReleaseSysCache(partcontup);
11814 162 : ReleaseSysCache(parentConstrTup);
11815 :
11816 : /*
11817 : * The action triggers in the new partition become redundant -- the parent
11818 : * table already has equivalent ones, and those will be able to reach the
11819 : * partition. Remove the ones in the partition. We identify them because
11820 : * they have our constraint OID, as well as being on the referenced rel.
11821 : */
11822 162 : DropForeignKeyConstraintTriggers(trigrel, partConstrOid, partConstrFrelid,
11823 : partConstrRelid);
11824 :
11825 162 : ConstraintSetParentConstraint(partConstrOid, parentConstrOid,
11826 : RelationGetRelid(partition));
11827 :
11828 : /*
11829 : * Like the constraint, attach partition's "check" triggers to the
11830 : * corresponding parent triggers if the constraint is ENFORCED. NOT
11831 : * ENFORCED constraints do not have these triggers.
11832 : */
11833 162 : if (parentConstrIsEnforced)
11834 : {
11835 : Oid insertTriggerOid,
11836 : updateTriggerOid;
11837 :
11838 150 : GetForeignKeyCheckTriggers(trigrel,
11839 : partConstrOid, partConstrFrelid, partConstrRelid,
11840 : &insertTriggerOid, &updateTriggerOid);
11841 : Assert(OidIsValid(insertTriggerOid) && OidIsValid(parentInsTrigger));
11842 150 : TriggerSetParentTrigger(trigrel, insertTriggerOid, parentInsTrigger,
11843 : RelationGetRelid(partition));
11844 : Assert(OidIsValid(updateTriggerOid) && OidIsValid(parentUpdTrigger));
11845 150 : TriggerSetParentTrigger(trigrel, updateTriggerOid, parentUpdTrigger,
11846 : RelationGetRelid(partition));
11847 : }
11848 :
11849 : /*
11850 : * We updated this pg_constraint row above to set its parent; validating
11851 : * it will cause its convalidated flag to change, so we need CCI here. In
11852 : * addition, we need it unconditionally for the rare case where the parent
11853 : * table has *two* identical constraints; when reaching this function for
11854 : * the second one, we must have made our changes visible, otherwise we
11855 : * would try to attach both to this one.
11856 : */
11857 162 : CommandCounterIncrement();
11858 :
11859 : /* If validation is needed, put it in the queue now. */
11860 162 : if (queueValidation)
11861 : {
11862 : Relation conrel;
11863 : Oid confrelid;
11864 :
11865 18 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
11866 :
11867 18 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(partConstrOid));
11868 18 : if (!HeapTupleIsValid(partcontup))
11869 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11870 :
11871 18 : confrelid = ((Form_pg_constraint) GETSTRUCT(partcontup))->confrelid;
11872 :
11873 : /* Use the same lock as for AT_ValidateConstraint */
11874 18 : QueueFKConstraintValidation(wqueue, conrel, partition, confrelid,
11875 : partcontup, ShareUpdateExclusiveLock);
11876 18 : ReleaseSysCache(partcontup);
11877 18 : table_close(conrel, RowExclusiveLock);
11878 : }
11879 162 : }
11880 :
11881 : /*
11882 : * RemoveInheritedConstraint
11883 : *
11884 : * Removes the constraint and its associated trigger from the specified
11885 : * relation, which inherited the given constraint.
11886 : */
11887 : static void
11888 36 : RemoveInheritedConstraint(Relation conrel, Relation trigrel, Oid conoid,
11889 : Oid conrelid)
11890 : {
11891 : ObjectAddresses *objs;
11892 : HeapTuple consttup;
11893 : ScanKeyData key;
11894 : SysScanDesc scan;
11895 : HeapTuple trigtup;
11896 :
11897 36 : ScanKeyInit(&key,
11898 : Anum_pg_constraint_conrelid,
11899 : BTEqualStrategyNumber, F_OIDEQ,
11900 : ObjectIdGetDatum(conrelid));
11901 :
11902 36 : scan = systable_beginscan(conrel,
11903 : ConstraintRelidTypidNameIndexId,
11904 : true, NULL, 1, &key);
11905 36 : objs = new_object_addresses();
11906 324 : while ((consttup = systable_getnext(scan)) != NULL)
11907 : {
11908 288 : Form_pg_constraint conform = (Form_pg_constraint) GETSTRUCT(consttup);
11909 :
11910 288 : if (conform->conparentid != conoid)
11911 210 : continue;
11912 : else
11913 : {
11914 : ObjectAddress addr;
11915 : SysScanDesc scan2;
11916 : ScanKeyData key2;
11917 : int n PG_USED_FOR_ASSERTS_ONLY;
11918 :
11919 78 : ObjectAddressSet(addr, ConstraintRelationId, conform->oid);
11920 78 : add_exact_object_address(&addr, objs);
11921 :
11922 : /*
11923 : * First we must delete the dependency record that binds the
11924 : * constraint records together.
11925 : */
11926 78 : n = deleteDependencyRecordsForSpecific(ConstraintRelationId,
11927 : conform->oid,
11928 : DEPENDENCY_INTERNAL,
11929 : ConstraintRelationId,
11930 : conoid);
11931 : Assert(n == 1); /* actually only one is expected */
11932 :
11933 : /*
11934 : * Now search for the triggers for this constraint and set them up
11935 : * for deletion too
11936 : */
11937 78 : ScanKeyInit(&key2,
11938 : Anum_pg_trigger_tgconstraint,
11939 : BTEqualStrategyNumber, F_OIDEQ,
11940 : ObjectIdGetDatum(conform->oid));
11941 78 : scan2 = systable_beginscan(trigrel, TriggerConstraintIndexId,
11942 : true, NULL, 1, &key2);
11943 234 : while ((trigtup = systable_getnext(scan2)) != NULL)
11944 : {
11945 156 : ObjectAddressSet(addr, TriggerRelationId,
11946 : ((Form_pg_trigger) GETSTRUCT(trigtup))->oid);
11947 156 : add_exact_object_address(&addr, objs);
11948 : }
11949 78 : systable_endscan(scan2);
11950 : }
11951 : }
11952 : /* make the dependency deletions visible */
11953 36 : CommandCounterIncrement();
11954 36 : performMultipleDeletions(objs, DROP_RESTRICT,
11955 : PERFORM_DELETION_INTERNAL);
11956 36 : systable_endscan(scan);
11957 36 : }
11958 :
11959 : /*
11960 : * DropForeignKeyConstraintTriggers
11961 : *
11962 : * The subroutine for tryAttachPartitionForeignKey handles the deletion of
11963 : * action triggers for the foreign key constraint.
11964 : *
11965 : * If valid confrelid and conrelid values are not provided, the respective
11966 : * trigger check will be skipped, and the trigger will be considered for
11967 : * removal.
11968 : */
11969 : static void
11970 234 : DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid, Oid confrelid,
11971 : Oid conrelid)
11972 : {
11973 : ScanKeyData key;
11974 : SysScanDesc scan;
11975 : HeapTuple trigtup;
11976 :
11977 234 : ScanKeyInit(&key,
11978 : Anum_pg_trigger_tgconstraint,
11979 : BTEqualStrategyNumber, F_OIDEQ,
11980 : ObjectIdGetDatum(conoid));
11981 234 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
11982 : NULL, 1, &key);
11983 1014 : while ((trigtup = systable_getnext(scan)) != NULL)
11984 : {
11985 780 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
11986 : ObjectAddress trigger;
11987 :
11988 : /* Invalid if trigger is not for a referential integrity constraint */
11989 780 : if (!OidIsValid(trgform->tgconstrrelid))
11990 300 : continue;
11991 780 : if (OidIsValid(conrelid) && trgform->tgconstrrelid != conrelid)
11992 300 : continue;
11993 480 : if (OidIsValid(confrelid) && trgform->tgrelid != confrelid)
11994 0 : continue;
11995 :
11996 : /* We should be dropping trigger related to foreign key constraint */
11997 : Assert(trgform->tgfoid == F_RI_FKEY_CHECK_INS ||
11998 : trgform->tgfoid == F_RI_FKEY_CHECK_UPD ||
11999 : trgform->tgfoid == F_RI_FKEY_CASCADE_DEL ||
12000 : trgform->tgfoid == F_RI_FKEY_CASCADE_UPD ||
12001 : trgform->tgfoid == F_RI_FKEY_RESTRICT_DEL ||
12002 : trgform->tgfoid == F_RI_FKEY_RESTRICT_UPD ||
12003 : trgform->tgfoid == F_RI_FKEY_SETNULL_DEL ||
12004 : trgform->tgfoid == F_RI_FKEY_SETNULL_UPD ||
12005 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_DEL ||
12006 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_UPD ||
12007 : trgform->tgfoid == F_RI_FKEY_NOACTION_DEL ||
12008 : trgform->tgfoid == F_RI_FKEY_NOACTION_UPD);
12009 :
12010 : /*
12011 : * The constraint is originally set up to contain this trigger as an
12012 : * implementation object, so there's a dependency record that links
12013 : * the two; however, since the trigger is no longer needed, we remove
12014 : * the dependency link in order to be able to drop the trigger while
12015 : * keeping the constraint intact.
12016 : */
12017 480 : deleteDependencyRecordsFor(TriggerRelationId,
12018 : trgform->oid,
12019 : false);
12020 : /* make dependency deletion visible to performDeletion */
12021 480 : CommandCounterIncrement();
12022 480 : ObjectAddressSet(trigger, TriggerRelationId,
12023 : trgform->oid);
12024 480 : performDeletion(&trigger, DROP_RESTRICT, 0);
12025 : /* make trigger drop visible, in case the loop iterates */
12026 480 : CommandCounterIncrement();
12027 : }
12028 :
12029 234 : systable_endscan(scan);
12030 234 : }
12031 :
12032 : /*
12033 : * GetForeignKeyActionTriggers
12034 : * Returns delete and update "action" triggers of the given relation
12035 : * belonging to the given constraint
12036 : */
12037 : static void
12038 222 : GetForeignKeyActionTriggers(Relation trigrel,
12039 : Oid conoid, Oid confrelid, Oid conrelid,
12040 : Oid *deleteTriggerOid,
12041 : Oid *updateTriggerOid)
12042 : {
12043 : ScanKeyData key;
12044 : SysScanDesc scan;
12045 : HeapTuple trigtup;
12046 :
12047 222 : *deleteTriggerOid = *updateTriggerOid = InvalidOid;
12048 222 : ScanKeyInit(&key,
12049 : Anum_pg_trigger_tgconstraint,
12050 : BTEqualStrategyNumber, F_OIDEQ,
12051 : ObjectIdGetDatum(conoid));
12052 :
12053 222 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12054 : NULL, 1, &key);
12055 450 : while ((trigtup = systable_getnext(scan)) != NULL)
12056 : {
12057 450 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12058 :
12059 450 : if (trgform->tgconstrrelid != conrelid)
12060 6 : continue;
12061 444 : if (trgform->tgrelid != confrelid)
12062 0 : continue;
12063 : /* Only ever look at "action" triggers on the PK side. */
12064 444 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_PK)
12065 0 : continue;
12066 444 : if (TRIGGER_FOR_DELETE(trgform->tgtype))
12067 : {
12068 : Assert(*deleteTriggerOid == InvalidOid);
12069 222 : *deleteTriggerOid = trgform->oid;
12070 : }
12071 222 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12072 : {
12073 : Assert(*updateTriggerOid == InvalidOid);
12074 222 : *updateTriggerOid = trgform->oid;
12075 : }
12076 : #ifndef USE_ASSERT_CHECKING
12077 : /* In an assert-enabled build, continue looking to find duplicates */
12078 444 : if (OidIsValid(*deleteTriggerOid) && OidIsValid(*updateTriggerOid))
12079 222 : break;
12080 : #endif
12081 : }
12082 :
12083 222 : if (!OidIsValid(*deleteTriggerOid))
12084 0 : elog(ERROR, "could not find ON DELETE action trigger of foreign key constraint %u",
12085 : conoid);
12086 222 : if (!OidIsValid(*updateTriggerOid))
12087 0 : elog(ERROR, "could not find ON UPDATE action trigger of foreign key constraint %u",
12088 : conoid);
12089 :
12090 222 : systable_endscan(scan);
12091 222 : }
12092 :
12093 : /*
12094 : * GetForeignKeyCheckTriggers
12095 : * Returns insert and update "check" triggers of the given relation
12096 : * belonging to the given constraint
12097 : */
12098 : static void
12099 832 : GetForeignKeyCheckTriggers(Relation trigrel,
12100 : Oid conoid, Oid confrelid, Oid conrelid,
12101 : Oid *insertTriggerOid,
12102 : Oid *updateTriggerOid)
12103 : {
12104 : ScanKeyData key;
12105 : SysScanDesc scan;
12106 : HeapTuple trigtup;
12107 :
12108 832 : *insertTriggerOid = *updateTriggerOid = InvalidOid;
12109 832 : ScanKeyInit(&key,
12110 : Anum_pg_trigger_tgconstraint,
12111 : BTEqualStrategyNumber, F_OIDEQ,
12112 : ObjectIdGetDatum(conoid));
12113 :
12114 832 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12115 : NULL, 1, &key);
12116 2672 : while ((trigtup = systable_getnext(scan)) != NULL)
12117 : {
12118 2672 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12119 :
12120 2672 : if (trgform->tgconstrrelid != confrelid)
12121 900 : continue;
12122 1772 : if (trgform->tgrelid != conrelid)
12123 0 : continue;
12124 : /* Only ever look at "check" triggers on the FK side. */
12125 1772 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_FK)
12126 108 : continue;
12127 1664 : if (TRIGGER_FOR_INSERT(trgform->tgtype))
12128 : {
12129 : Assert(*insertTriggerOid == InvalidOid);
12130 832 : *insertTriggerOid = trgform->oid;
12131 : }
12132 832 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12133 : {
12134 : Assert(*updateTriggerOid == InvalidOid);
12135 832 : *updateTriggerOid = trgform->oid;
12136 : }
12137 : #ifndef USE_ASSERT_CHECKING
12138 : /* In an assert-enabled build, continue looking to find duplicates. */
12139 1664 : if (OidIsValid(*insertTriggerOid) && OidIsValid(*updateTriggerOid))
12140 832 : break;
12141 : #endif
12142 : }
12143 :
12144 832 : if (!OidIsValid(*insertTriggerOid))
12145 0 : elog(ERROR, "could not find ON INSERT check triggers of foreign key constraint %u",
12146 : conoid);
12147 832 : if (!OidIsValid(*updateTriggerOid))
12148 0 : elog(ERROR, "could not find ON UPDATE check triggers of foreign key constraint %u",
12149 : conoid);
12150 :
12151 832 : systable_endscan(scan);
12152 832 : }
12153 :
12154 : /*
12155 : * ALTER TABLE ALTER CONSTRAINT
12156 : *
12157 : * Update the attributes of a constraint.
12158 : *
12159 : * Currently only works for Foreign Key and not null constraints.
12160 : *
12161 : * If the constraint is modified, returns its address; otherwise, return
12162 : * InvalidObjectAddress.
12163 : */
12164 : static ObjectAddress
12165 288 : ATExecAlterConstraint(List **wqueue, Relation rel, ATAlterConstraint *cmdcon,
12166 : bool recurse, LOCKMODE lockmode)
12167 : {
12168 : Relation conrel;
12169 : Relation tgrel;
12170 : SysScanDesc scan;
12171 : ScanKeyData skey[3];
12172 : HeapTuple contuple;
12173 : Form_pg_constraint currcon;
12174 : ObjectAddress address;
12175 :
12176 : /*
12177 : * Disallow altering ONLY a partitioned table, as it would make no sense.
12178 : * This is okay for legacy inheritance.
12179 : */
12180 288 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
12181 0 : ereport(ERROR,
12182 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12183 : errmsg("constraint must be altered in child tables too"),
12184 : errhint("Do not specify the ONLY keyword."));
12185 :
12186 :
12187 288 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12188 288 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
12189 :
12190 : /*
12191 : * Find and check the target constraint
12192 : */
12193 288 : ScanKeyInit(&skey[0],
12194 : Anum_pg_constraint_conrelid,
12195 : BTEqualStrategyNumber, F_OIDEQ,
12196 : ObjectIdGetDatum(RelationGetRelid(rel)));
12197 288 : ScanKeyInit(&skey[1],
12198 : Anum_pg_constraint_contypid,
12199 : BTEqualStrategyNumber, F_OIDEQ,
12200 : ObjectIdGetDatum(InvalidOid));
12201 288 : ScanKeyInit(&skey[2],
12202 : Anum_pg_constraint_conname,
12203 : BTEqualStrategyNumber, F_NAMEEQ,
12204 288 : CStringGetDatum(cmdcon->conname));
12205 288 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12206 : true, NULL, 3, skey);
12207 :
12208 : /* There can be at most one matching row */
12209 288 : if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
12210 6 : ereport(ERROR,
12211 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12212 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12213 : cmdcon->conname, RelationGetRelationName(rel))));
12214 :
12215 282 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12216 282 : if (cmdcon->alterDeferrability && currcon->contype != CONSTRAINT_FOREIGN)
12217 0 : ereport(ERROR,
12218 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12219 : errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key constraint",
12220 : cmdcon->conname, RelationGetRelationName(rel))));
12221 282 : if (cmdcon->alterEnforceability && currcon->contype != CONSTRAINT_FOREIGN)
12222 12 : ereport(ERROR,
12223 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12224 : errmsg("cannot alter enforceability of constraint \"%s\" of relation \"%s\"",
12225 : cmdcon->conname, RelationGetRelationName(rel))));
12226 270 : if (cmdcon->alterInheritability &&
12227 90 : currcon->contype != CONSTRAINT_NOTNULL)
12228 24 : ereport(ERROR,
12229 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12230 : errmsg("constraint \"%s\" of relation \"%s\" is not a not-null constraint",
12231 : cmdcon->conname, RelationGetRelationName(rel)));
12232 :
12233 : /* Refuse to modify inheritability of inherited constraints */
12234 246 : if (cmdcon->alterInheritability &&
12235 66 : cmdcon->noinherit && currcon->coninhcount > 0)
12236 6 : ereport(ERROR,
12237 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12238 : errmsg("cannot alter inherited constraint \"%s\" on relation \"%s\"",
12239 : NameStr(currcon->conname),
12240 : RelationGetRelationName(rel)));
12241 :
12242 : /*
12243 : * If it's not the topmost constraint, raise an error.
12244 : *
12245 : * Altering a non-topmost constraint leaves some triggers untouched, since
12246 : * they are not directly connected to this constraint; also, pg_dump would
12247 : * ignore the deferrability status of the individual constraint, since it
12248 : * only dumps topmost constraints. Avoid these problems by refusing this
12249 : * operation and telling the user to alter the parent constraint instead.
12250 : */
12251 240 : if (OidIsValid(currcon->conparentid))
12252 : {
12253 : HeapTuple tp;
12254 12 : Oid parent = currcon->conparentid;
12255 12 : char *ancestorname = NULL;
12256 12 : char *ancestortable = NULL;
12257 :
12258 : /* Loop to find the topmost constraint */
12259 24 : while (HeapTupleIsValid(tp = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parent))))
12260 : {
12261 24 : Form_pg_constraint contup = (Form_pg_constraint) GETSTRUCT(tp);
12262 :
12263 : /* If no parent, this is the constraint we want */
12264 24 : if (!OidIsValid(contup->conparentid))
12265 : {
12266 12 : ancestorname = pstrdup(NameStr(contup->conname));
12267 12 : ancestortable = get_rel_name(contup->conrelid);
12268 12 : ReleaseSysCache(tp);
12269 12 : break;
12270 : }
12271 :
12272 12 : parent = contup->conparentid;
12273 12 : ReleaseSysCache(tp);
12274 : }
12275 :
12276 12 : ereport(ERROR,
12277 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12278 : errmsg("cannot alter constraint \"%s\" on relation \"%s\"",
12279 : cmdcon->conname, RelationGetRelationName(rel)),
12280 : ancestorname && ancestortable ?
12281 : errdetail("Constraint \"%s\" is derived from constraint \"%s\" of relation \"%s\".",
12282 : cmdcon->conname, ancestorname, ancestortable) : 0,
12283 : errhint("You may alter the constraint it derives from instead.")));
12284 : }
12285 :
12286 228 : address = InvalidObjectAddress;
12287 :
12288 : /*
12289 : * Do the actual catalog work, and recurse if necessary.
12290 : */
12291 228 : if (ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, rel,
12292 : contuple, recurse, lockmode))
12293 216 : ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
12294 :
12295 222 : systable_endscan(scan);
12296 :
12297 222 : table_close(tgrel, RowExclusiveLock);
12298 222 : table_close(conrel, RowExclusiveLock);
12299 :
12300 222 : return address;
12301 : }
12302 :
12303 : /*
12304 : * A subroutine of ATExecAlterConstraint that calls the respective routines for
12305 : * altering constraint's enforceability, deferrability or inheritability.
12306 : */
12307 : static bool
12308 228 : ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon,
12309 : Relation conrel, Relation tgrel, Relation rel,
12310 : HeapTuple contuple, bool recurse,
12311 : LOCKMODE lockmode)
12312 : {
12313 : Form_pg_constraint currcon;
12314 228 : bool changed = false;
12315 228 : List *otherrelids = NIL;
12316 :
12317 228 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12318 :
12319 : /*
12320 : * Do the catalog work for the enforceability or deferrability change,
12321 : * recurse if necessary.
12322 : *
12323 : * Note that even if deferrability is requested to be altered along with
12324 : * enforceability, we don't need to explicitly update multiple entries in
12325 : * pg_trigger related to deferrability.
12326 : *
12327 : * Modifying enforceability involves either creating or dropping the
12328 : * trigger, during which the deferrability setting will be adjusted
12329 : * automatically.
12330 : */
12331 300 : if (cmdcon->alterEnforceability &&
12332 72 : ATExecAlterConstrEnforceability(wqueue, cmdcon, conrel, tgrel,
12333 : currcon->conrelid, currcon->confrelid,
12334 : contuple, lockmode, InvalidOid,
12335 : InvalidOid, InvalidOid, InvalidOid))
12336 66 : changed = true;
12337 :
12338 258 : else if (cmdcon->alterDeferrability &&
12339 96 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, rel,
12340 : contuple, recurse, &otherrelids,
12341 : lockmode))
12342 : {
12343 : /*
12344 : * AlterConstrUpdateConstraintEntry already invalidated relcache for
12345 : * the relations having the constraint itself; here we also invalidate
12346 : * for relations that have any triggers that are part of the
12347 : * constraint.
12348 : */
12349 306 : foreach_oid(relid, otherrelids)
12350 114 : CacheInvalidateRelcacheByRelid(relid);
12351 :
12352 96 : changed = true;
12353 : }
12354 :
12355 : /*
12356 : * Do the catalog work for the inheritability change.
12357 : */
12358 282 : if (cmdcon->alterInheritability &&
12359 60 : ATExecAlterConstrInheritability(wqueue, cmdcon, conrel, rel, contuple,
12360 : lockmode))
12361 54 : changed = true;
12362 :
12363 222 : return changed;
12364 : }
12365 :
12366 : /*
12367 : * Returns true if the constraint's enforceability is altered.
12368 : *
12369 : * Depending on whether the constraint is being set to ENFORCED or NOT
12370 : * ENFORCED, it creates or drops the trigger accordingly.
12371 : *
12372 : * Note that we must recurse even when trying to change a constraint to not
12373 : * enforced if it is already not enforced, in case descendant constraints
12374 : * might be enforced and need to be changed to not enforced. Conversely, we
12375 : * should do nothing if a constraint is being set to enforced and is already
12376 : * enforced, as descendant constraints cannot be different in that case.
12377 : */
12378 : static bool
12379 168 : ATExecAlterConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12380 : Relation conrel, Relation tgrel,
12381 : Oid fkrelid, Oid pkrelid,
12382 : HeapTuple contuple, LOCKMODE lockmode,
12383 : Oid ReferencedParentDelTrigger,
12384 : Oid ReferencedParentUpdTrigger,
12385 : Oid ReferencingParentInsTrigger,
12386 : Oid ReferencingParentUpdTrigger)
12387 : {
12388 : Form_pg_constraint currcon;
12389 : Oid conoid;
12390 : Relation rel;
12391 168 : bool changed = false;
12392 :
12393 : /* Since this function recurses, it could be driven to stack overflow */
12394 168 : check_stack_depth();
12395 :
12396 : Assert(cmdcon->alterEnforceability);
12397 :
12398 168 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12399 168 : conoid = currcon->oid;
12400 :
12401 : /* Should be foreign key constraint */
12402 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12403 :
12404 168 : rel = table_open(currcon->conrelid, lockmode);
12405 :
12406 168 : if (currcon->conenforced != cmdcon->is_enforced)
12407 : {
12408 162 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12409 162 : changed = true;
12410 : }
12411 :
12412 : /* Drop triggers */
12413 168 : if (!cmdcon->is_enforced)
12414 : {
12415 : /*
12416 : * When setting a constraint to NOT ENFORCED, the constraint triggers
12417 : * need to be dropped. Therefore, we must process the child relations
12418 : * first, followed by the parent, to account for dependencies.
12419 : */
12420 126 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12421 54 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12422 18 : AlterConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12423 : fkrelid, pkrelid, contuple,
12424 : lockmode, InvalidOid, InvalidOid,
12425 : InvalidOid, InvalidOid);
12426 :
12427 : /* Drop all the triggers */
12428 72 : DropForeignKeyConstraintTriggers(tgrel, conoid, InvalidOid, InvalidOid);
12429 : }
12430 96 : else if (changed) /* Create triggers */
12431 : {
12432 96 : Oid ReferencedDelTriggerOid = InvalidOid,
12433 96 : ReferencedUpdTriggerOid = InvalidOid,
12434 96 : ReferencingInsTriggerOid = InvalidOid,
12435 96 : ReferencingUpdTriggerOid = InvalidOid;
12436 :
12437 : /* Prepare the minimal information required for trigger creation. */
12438 96 : Constraint *fkconstraint = makeNode(Constraint);
12439 :
12440 96 : fkconstraint->conname = pstrdup(NameStr(currcon->conname));
12441 96 : fkconstraint->fk_matchtype = currcon->confmatchtype;
12442 96 : fkconstraint->fk_upd_action = currcon->confupdtype;
12443 96 : fkconstraint->fk_del_action = currcon->confdeltype;
12444 :
12445 : /* Create referenced triggers */
12446 96 : if (currcon->conrelid == fkrelid)
12447 54 : createForeignKeyActionTriggers(currcon->conrelid,
12448 : currcon->confrelid,
12449 : fkconstraint,
12450 : conoid,
12451 : currcon->conindid,
12452 : ReferencedParentDelTrigger,
12453 : ReferencedParentUpdTrigger,
12454 : &ReferencedDelTriggerOid,
12455 : &ReferencedUpdTriggerOid);
12456 :
12457 : /* Create referencing triggers */
12458 96 : if (currcon->confrelid == pkrelid)
12459 84 : createForeignKeyCheckTriggers(currcon->conrelid,
12460 : pkrelid,
12461 : fkconstraint,
12462 : conoid,
12463 : currcon->conindid,
12464 : ReferencingParentInsTrigger,
12465 : ReferencingParentUpdTrigger,
12466 : &ReferencingInsTriggerOid,
12467 : &ReferencingUpdTriggerOid);
12468 :
12469 : /*
12470 : * Tell Phase 3 to check that the constraint is satisfied by existing
12471 : * rows. Only applies to leaf partitions, and (for constraints that
12472 : * reference a partitioned table) only if this is not one of the
12473 : * pg_constraint rows that exist solely to support action triggers.
12474 : */
12475 96 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
12476 78 : currcon->confrelid == pkrelid)
12477 : {
12478 : AlteredTableInfo *tab;
12479 : NewConstraint *newcon;
12480 :
12481 66 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
12482 66 : newcon->name = fkconstraint->conname;
12483 66 : newcon->contype = CONSTR_FOREIGN;
12484 66 : newcon->refrelid = currcon->confrelid;
12485 66 : newcon->refindid = currcon->conindid;
12486 66 : newcon->conid = currcon->oid;
12487 66 : newcon->qual = (Node *) fkconstraint;
12488 :
12489 : /* Find or create work queue entry for this table */
12490 66 : tab = ATGetQueueEntry(wqueue, rel);
12491 66 : tab->constraints = lappend(tab->constraints, newcon);
12492 : }
12493 :
12494 : /*
12495 : * If the table at either end of the constraint is partitioned, we
12496 : * need to recurse and create triggers for each constraint that is a
12497 : * child of this one.
12498 : */
12499 174 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12500 78 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12501 24 : AlterConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12502 : fkrelid, pkrelid, contuple,
12503 : lockmode, ReferencedDelTriggerOid,
12504 : ReferencedUpdTriggerOid,
12505 : ReferencingInsTriggerOid,
12506 : ReferencingUpdTriggerOid);
12507 : }
12508 :
12509 168 : table_close(rel, NoLock);
12510 :
12511 168 : return changed;
12512 : }
12513 :
12514 : /*
12515 : * Returns true if the constraint's deferrability is altered.
12516 : *
12517 : * *otherrelids is appended OIDs of relations containing affected triggers.
12518 : *
12519 : * Note that we must recurse even when the values are correct, in case
12520 : * indirect descendants have had their constraints altered locally.
12521 : * (This could be avoided if we forbade altering constraints in partitions
12522 : * but existing releases don't do that.)
12523 : */
12524 : static bool
12525 162 : ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
12526 : Relation conrel, Relation tgrel, Relation rel,
12527 : HeapTuple contuple, bool recurse,
12528 : List **otherrelids, LOCKMODE lockmode)
12529 : {
12530 : Form_pg_constraint currcon;
12531 : Oid refrelid;
12532 162 : bool changed = false;
12533 :
12534 : /* since this function recurses, it could be driven to stack overflow */
12535 162 : check_stack_depth();
12536 :
12537 : Assert(cmdcon->alterDeferrability);
12538 :
12539 162 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12540 162 : refrelid = currcon->confrelid;
12541 :
12542 : /* Should be foreign key constraint */
12543 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12544 :
12545 : /*
12546 : * If called to modify a constraint that's already in the desired state,
12547 : * silently do nothing.
12548 : */
12549 162 : if (currcon->condeferrable != cmdcon->deferrable ||
12550 6 : currcon->condeferred != cmdcon->initdeferred)
12551 : {
12552 162 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12553 162 : changed = true;
12554 :
12555 : /*
12556 : * Now we need to update the multiple entries in pg_trigger that
12557 : * implement the constraint.
12558 : */
12559 162 : AlterConstrTriggerDeferrability(currcon->oid, tgrel, rel,
12560 162 : cmdcon->deferrable,
12561 162 : cmdcon->initdeferred, otherrelids);
12562 : }
12563 :
12564 : /*
12565 : * If the table at either end of the constraint is partitioned, we need to
12566 : * handle every constraint that is a child of this one.
12567 : */
12568 162 : if (recurse && changed &&
12569 300 : (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12570 138 : get_rel_relkind(refrelid) == RELKIND_PARTITIONED_TABLE))
12571 42 : AlterConstrDeferrabilityRecurse(wqueue, cmdcon, conrel, tgrel, rel,
12572 : contuple, recurse, otherrelids,
12573 : lockmode);
12574 :
12575 162 : return changed;
12576 : }
12577 :
12578 : /*
12579 : * Returns true if the constraint's inheritability is altered.
12580 : */
12581 : static bool
12582 60 : ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
12583 : Relation conrel, Relation rel,
12584 : HeapTuple contuple, LOCKMODE lockmode)
12585 : {
12586 : Form_pg_constraint currcon;
12587 : AttrNumber colNum;
12588 : char *colName;
12589 : List *children;
12590 :
12591 : Assert(cmdcon->alterInheritability);
12592 :
12593 60 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12594 :
12595 : /* The current implementation only works for NOT NULL constraints */
12596 : Assert(currcon->contype == CONSTRAINT_NOTNULL);
12597 :
12598 : /*
12599 : * If called to modify a constraint that's already in the desired state,
12600 : * silently do nothing.
12601 : */
12602 60 : if (cmdcon->noinherit == currcon->connoinherit)
12603 0 : return false;
12604 :
12605 60 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12606 60 : CommandCounterIncrement();
12607 :
12608 : /* Fetch the column number and name */
12609 60 : colNum = extractNotNullColumn(contuple);
12610 60 : colName = get_attname(currcon->conrelid, colNum, false);
12611 :
12612 : /*
12613 : * Propagate the change to children. For this subcommand type we don't
12614 : * recursively affect children, just the immediate level.
12615 : */
12616 60 : children = find_inheritance_children(RelationGetRelid(rel),
12617 : lockmode);
12618 192 : foreach_oid(childoid, children)
12619 : {
12620 : ObjectAddress addr;
12621 :
12622 84 : if (cmdcon->noinherit)
12623 : {
12624 : HeapTuple childtup;
12625 : Form_pg_constraint childcon;
12626 :
12627 30 : childtup = findNotNullConstraint(childoid, colName);
12628 30 : if (!childtup)
12629 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
12630 : colName, childoid);
12631 30 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12632 : Assert(childcon->coninhcount > 0);
12633 30 : childcon->coninhcount--;
12634 30 : childcon->conislocal = true;
12635 30 : CatalogTupleUpdate(conrel, &childtup->t_self, childtup);
12636 30 : heap_freetuple(childtup);
12637 : }
12638 : else
12639 : {
12640 54 : Relation childrel = table_open(childoid, NoLock);
12641 :
12642 54 : addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
12643 : colName, true, true, lockmode);
12644 48 : if (OidIsValid(addr.objectId))
12645 48 : CommandCounterIncrement();
12646 48 : table_close(childrel, NoLock);
12647 : }
12648 : }
12649 :
12650 54 : return true;
12651 : }
12652 :
12653 : /*
12654 : * A subroutine of ATExecAlterConstrDeferrability that updated constraint
12655 : * trigger's deferrability.
12656 : *
12657 : * The arguments to this function have the same meaning as the arguments to
12658 : * ATExecAlterConstrDeferrability.
12659 : */
12660 : static void
12661 162 : AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
12662 : bool deferrable, bool initdeferred,
12663 : List **otherrelids)
12664 : {
12665 : HeapTuple tgtuple;
12666 : ScanKeyData tgkey;
12667 : SysScanDesc tgscan;
12668 :
12669 162 : ScanKeyInit(&tgkey,
12670 : Anum_pg_trigger_tgconstraint,
12671 : BTEqualStrategyNumber, F_OIDEQ,
12672 : ObjectIdGetDatum(conoid));
12673 162 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
12674 : NULL, 1, &tgkey);
12675 630 : while (HeapTupleIsValid(tgtuple = systable_getnext(tgscan)))
12676 : {
12677 468 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tgtuple);
12678 : Form_pg_trigger copy_tg;
12679 : HeapTuple tgCopyTuple;
12680 :
12681 : /*
12682 : * Remember OIDs of other relation(s) involved in FK constraint.
12683 : * (Note: it's likely that we could skip forcing a relcache inval for
12684 : * other rels that don't have a trigger whose properties change, but
12685 : * let's be conservative.)
12686 : */
12687 468 : if (tgform->tgrelid != RelationGetRelid(rel))
12688 228 : *otherrelids = list_append_unique_oid(*otherrelids,
12689 : tgform->tgrelid);
12690 :
12691 : /*
12692 : * Update enable status and deferrability of RI_FKey_noaction_del,
12693 : * RI_FKey_noaction_upd, RI_FKey_check_ins and RI_FKey_check_upd
12694 : * triggers, but not others; see createForeignKeyActionTriggers and
12695 : * CreateFKCheckTrigger.
12696 : */
12697 468 : if (tgform->tgfoid != F_RI_FKEY_NOACTION_DEL &&
12698 372 : tgform->tgfoid != F_RI_FKEY_NOACTION_UPD &&
12699 258 : tgform->tgfoid != F_RI_FKEY_CHECK_INS &&
12700 138 : tgform->tgfoid != F_RI_FKEY_CHECK_UPD)
12701 18 : continue;
12702 :
12703 450 : tgCopyTuple = heap_copytuple(tgtuple);
12704 450 : copy_tg = (Form_pg_trigger) GETSTRUCT(tgCopyTuple);
12705 :
12706 450 : copy_tg->tgdeferrable = deferrable;
12707 450 : copy_tg->tginitdeferred = initdeferred;
12708 450 : CatalogTupleUpdate(tgrel, &tgCopyTuple->t_self, tgCopyTuple);
12709 :
12710 450 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
12711 :
12712 450 : heap_freetuple(tgCopyTuple);
12713 : }
12714 :
12715 162 : systable_endscan(tgscan);
12716 162 : }
12717 :
12718 : /*
12719 : * Invokes ATExecAlterConstrEnforceability for each constraint that is a child of
12720 : * the specified constraint.
12721 : *
12722 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
12723 : * list of child relations and recursing; instead it uses the conparentid
12724 : * relationships. This may need to be reconsidered.
12725 : *
12726 : * The arguments to this function have the same meaning as the arguments to
12727 : * ATExecAlterConstrEnforceability.
12728 : */
12729 : static void
12730 42 : AlterConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12731 : Relation conrel, Relation tgrel,
12732 : Oid fkrelid, Oid pkrelid,
12733 : HeapTuple contuple, LOCKMODE lockmode,
12734 : Oid ReferencedParentDelTrigger,
12735 : Oid ReferencedParentUpdTrigger,
12736 : Oid ReferencingParentInsTrigger,
12737 : Oid ReferencingParentUpdTrigger)
12738 : {
12739 : Form_pg_constraint currcon;
12740 : Oid conoid;
12741 : ScanKeyData pkey;
12742 : SysScanDesc pscan;
12743 : HeapTuple childtup;
12744 :
12745 42 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12746 42 : conoid = currcon->oid;
12747 :
12748 42 : ScanKeyInit(&pkey,
12749 : Anum_pg_constraint_conparentid,
12750 : BTEqualStrategyNumber, F_OIDEQ,
12751 : ObjectIdGetDatum(conoid));
12752 :
12753 42 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
12754 : true, NULL, 1, &pkey);
12755 :
12756 138 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
12757 96 : ATExecAlterConstrEnforceability(wqueue, cmdcon, conrel, tgrel, fkrelid,
12758 : pkrelid, childtup, lockmode,
12759 : ReferencedParentDelTrigger,
12760 : ReferencedParentUpdTrigger,
12761 : ReferencingParentInsTrigger,
12762 : ReferencingParentUpdTrigger);
12763 :
12764 42 : systable_endscan(pscan);
12765 42 : }
12766 :
12767 : /*
12768 : * Invokes ATExecAlterConstrDeferrability for each constraint that is a child of
12769 : * the specified constraint.
12770 : *
12771 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
12772 : * list of child relations and recursing; instead it uses the conparentid
12773 : * relationships. This may need to be reconsidered.
12774 : *
12775 : * The arguments to this function have the same meaning as the arguments to
12776 : * ATExecAlterConstrDeferrability.
12777 : */
12778 : static void
12779 42 : AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12780 : Relation conrel, Relation tgrel, Relation rel,
12781 : HeapTuple contuple, bool recurse,
12782 : List **otherrelids, LOCKMODE lockmode)
12783 : {
12784 : Form_pg_constraint currcon;
12785 : Oid conoid;
12786 : ScanKeyData pkey;
12787 : SysScanDesc pscan;
12788 : HeapTuple childtup;
12789 :
12790 42 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12791 42 : conoid = currcon->oid;
12792 :
12793 42 : ScanKeyInit(&pkey,
12794 : Anum_pg_constraint_conparentid,
12795 : BTEqualStrategyNumber, F_OIDEQ,
12796 : ObjectIdGetDatum(conoid));
12797 :
12798 42 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
12799 : true, NULL, 1, &pkey);
12800 :
12801 108 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
12802 : {
12803 66 : Form_pg_constraint childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12804 : Relation childrel;
12805 :
12806 66 : childrel = table_open(childcon->conrelid, lockmode);
12807 :
12808 66 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, childrel,
12809 : childtup, recurse, otherrelids, lockmode);
12810 66 : table_close(childrel, NoLock);
12811 : }
12812 :
12813 42 : systable_endscan(pscan);
12814 42 : }
12815 :
12816 : /*
12817 : * Update the constraint entry for the given ATAlterConstraint command, and
12818 : * invoke the appropriate hooks.
12819 : */
12820 : static void
12821 384 : AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
12822 : HeapTuple contuple)
12823 : {
12824 : HeapTuple copyTuple;
12825 : Form_pg_constraint copy_con;
12826 :
12827 : Assert(cmdcon->alterEnforceability || cmdcon->alterDeferrability ||
12828 : cmdcon->alterInheritability);
12829 :
12830 384 : copyTuple = heap_copytuple(contuple);
12831 384 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
12832 :
12833 384 : if (cmdcon->alterEnforceability)
12834 : {
12835 162 : copy_con->conenforced = cmdcon->is_enforced;
12836 :
12837 : /*
12838 : * NB: The convalidated status is irrelevant when the constraint is
12839 : * set to NOT ENFORCED, but for consistency, it should still be set
12840 : * appropriately. Similarly, if the constraint is later changed to
12841 : * ENFORCED, validation will be performed during phase 3, so it makes
12842 : * sense to mark it as valid in that case.
12843 : */
12844 162 : copy_con->convalidated = cmdcon->is_enforced;
12845 : }
12846 384 : if (cmdcon->alterDeferrability)
12847 : {
12848 168 : copy_con->condeferrable = cmdcon->deferrable;
12849 168 : copy_con->condeferred = cmdcon->initdeferred;
12850 : }
12851 384 : if (cmdcon->alterInheritability)
12852 60 : copy_con->connoinherit = cmdcon->noinherit;
12853 :
12854 384 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
12855 384 : InvokeObjectPostAlterHook(ConstraintRelationId, copy_con->oid, 0);
12856 :
12857 : /* Make new constraint flags visible to others */
12858 384 : CacheInvalidateRelcacheByRelid(copy_con->conrelid);
12859 :
12860 384 : heap_freetuple(copyTuple);
12861 384 : }
12862 :
12863 : /*
12864 : * ALTER TABLE VALIDATE CONSTRAINT
12865 : *
12866 : * XXX The reason we handle recursion here rather than at Phase 1 is because
12867 : * there's no good way to skip recursing when handling foreign keys: there is
12868 : * no need to lock children in that case, yet we wouldn't be able to avoid
12869 : * doing so at that level.
12870 : *
12871 : * Return value is the address of the validated constraint. If the constraint
12872 : * was already validated, InvalidObjectAddress is returned.
12873 : */
12874 : static ObjectAddress
12875 584 : ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
12876 : bool recurse, bool recursing, LOCKMODE lockmode)
12877 : {
12878 : Relation conrel;
12879 : SysScanDesc scan;
12880 : ScanKeyData skey[3];
12881 : HeapTuple tuple;
12882 : Form_pg_constraint con;
12883 : ObjectAddress address;
12884 :
12885 584 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12886 :
12887 : /*
12888 : * Find and check the target constraint
12889 : */
12890 584 : ScanKeyInit(&skey[0],
12891 : Anum_pg_constraint_conrelid,
12892 : BTEqualStrategyNumber, F_OIDEQ,
12893 : ObjectIdGetDatum(RelationGetRelid(rel)));
12894 584 : ScanKeyInit(&skey[1],
12895 : Anum_pg_constraint_contypid,
12896 : BTEqualStrategyNumber, F_OIDEQ,
12897 : ObjectIdGetDatum(InvalidOid));
12898 584 : ScanKeyInit(&skey[2],
12899 : Anum_pg_constraint_conname,
12900 : BTEqualStrategyNumber, F_NAMEEQ,
12901 : CStringGetDatum(constrName));
12902 584 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12903 : true, NULL, 3, skey);
12904 :
12905 : /* There can be at most one matching row */
12906 584 : if (!HeapTupleIsValid(tuple = systable_getnext(scan)))
12907 0 : ereport(ERROR,
12908 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12909 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12910 : constrName, RelationGetRelationName(rel))));
12911 :
12912 584 : con = (Form_pg_constraint) GETSTRUCT(tuple);
12913 584 : if (con->contype != CONSTRAINT_FOREIGN &&
12914 256 : con->contype != CONSTRAINT_CHECK &&
12915 112 : con->contype != CONSTRAINT_NOTNULL)
12916 0 : ereport(ERROR,
12917 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12918 : errmsg("cannot validate constraint \"%s\" of relation \"%s\"",
12919 : constrName, RelationGetRelationName(rel)),
12920 : errdetail("This operation is not supported for this type of constraint."));
12921 :
12922 584 : if (!con->conenforced)
12923 6 : ereport(ERROR,
12924 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12925 : errmsg("cannot validate NOT ENFORCED constraint")));
12926 :
12927 578 : if (!con->convalidated)
12928 : {
12929 560 : if (con->contype == CONSTRAINT_FOREIGN)
12930 : {
12931 322 : QueueFKConstraintValidation(wqueue, conrel, rel, con->confrelid,
12932 : tuple, lockmode);
12933 : }
12934 238 : else if (con->contype == CONSTRAINT_CHECK)
12935 : {
12936 126 : QueueCheckConstraintValidation(wqueue, conrel, rel, constrName,
12937 : tuple, recurse, recursing, lockmode);
12938 : }
12939 112 : else if (con->contype == CONSTRAINT_NOTNULL)
12940 : {
12941 112 : QueueNNConstraintValidation(wqueue, conrel, rel,
12942 : tuple, recurse, recursing, lockmode);
12943 : }
12944 :
12945 560 : ObjectAddressSet(address, ConstraintRelationId, con->oid);
12946 : }
12947 : else
12948 18 : address = InvalidObjectAddress; /* already validated */
12949 :
12950 578 : systable_endscan(scan);
12951 :
12952 578 : table_close(conrel, RowExclusiveLock);
12953 :
12954 578 : return address;
12955 : }
12956 :
12957 : /*
12958 : * QueueFKConstraintValidation
12959 : *
12960 : * Add an entry to the wqueue to validate the given foreign key constraint in
12961 : * Phase 3 and update the convalidated field in the pg_constraint catalog
12962 : * for the specified relation and all its children.
12963 : */
12964 : static void
12965 394 : QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
12966 : Oid pkrelid, HeapTuple contuple, LOCKMODE lockmode)
12967 : {
12968 : Form_pg_constraint con;
12969 : AlteredTableInfo *tab;
12970 : HeapTuple copyTuple;
12971 : Form_pg_constraint copy_con;
12972 :
12973 394 : con = (Form_pg_constraint) GETSTRUCT(contuple);
12974 : Assert(con->contype == CONSTRAINT_FOREIGN);
12975 : Assert(!con->convalidated);
12976 :
12977 : /*
12978 : * Add the validation to phase 3's queue; not needed for partitioned
12979 : * tables themselves, only for their partitions.
12980 : *
12981 : * When the referenced table (pkrelid) is partitioned, the referencing
12982 : * table (fkrel) has one pg_constraint row pointing to each partition
12983 : * thereof. These rows are there only to support action triggers and no
12984 : * table scan is needed, therefore skip this for them as well.
12985 : */
12986 394 : if (fkrel->rd_rel->relkind == RELKIND_RELATION &&
12987 346 : con->confrelid == pkrelid)
12988 : {
12989 : NewConstraint *newcon;
12990 : Constraint *fkconstraint;
12991 :
12992 : /* Queue validation for phase 3 */
12993 334 : fkconstraint = makeNode(Constraint);
12994 : /* for now this is all we need */
12995 334 : fkconstraint->conname = pstrdup(NameStr(con->conname));
12996 :
12997 334 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
12998 334 : newcon->name = fkconstraint->conname;
12999 334 : newcon->contype = CONSTR_FOREIGN;
13000 334 : newcon->refrelid = con->confrelid;
13001 334 : newcon->refindid = con->conindid;
13002 334 : newcon->conid = con->oid;
13003 334 : newcon->qual = (Node *) fkconstraint;
13004 :
13005 : /* Find or create work queue entry for this table */
13006 334 : tab = ATGetQueueEntry(wqueue, fkrel);
13007 334 : tab->constraints = lappend(tab->constraints, newcon);
13008 : }
13009 :
13010 : /*
13011 : * If the table at either end of the constraint is partitioned, we need to
13012 : * recurse and handle every unvalidate constraint that is a child of this
13013 : * constraint.
13014 : */
13015 740 : if (fkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
13016 346 : get_rel_relkind(con->confrelid) == RELKIND_PARTITIONED_TABLE)
13017 : {
13018 : ScanKeyData pkey;
13019 : SysScanDesc pscan;
13020 : HeapTuple childtup;
13021 :
13022 72 : ScanKeyInit(&pkey,
13023 : Anum_pg_constraint_conparentid,
13024 : BTEqualStrategyNumber, F_OIDEQ,
13025 : ObjectIdGetDatum(con->oid));
13026 :
13027 72 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13028 : true, NULL, 1, &pkey);
13029 :
13030 144 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13031 : {
13032 : Form_pg_constraint childcon;
13033 : Relation childrel;
13034 :
13035 72 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13036 :
13037 : /*
13038 : * If the child constraint has already been validated, no further
13039 : * action is required for it or its descendants, as they are all
13040 : * valid.
13041 : */
13042 72 : if (childcon->convalidated)
13043 18 : continue;
13044 :
13045 54 : childrel = table_open(childcon->conrelid, lockmode);
13046 :
13047 : /*
13048 : * NB: Note that pkrelid should be passed as-is during recursion,
13049 : * as it is required to identify the root referenced table.
13050 : */
13051 54 : QueueFKConstraintValidation(wqueue, conrel, childrel, pkrelid,
13052 : childtup, lockmode);
13053 54 : table_close(childrel, NoLock);
13054 : }
13055 :
13056 72 : systable_endscan(pscan);
13057 : }
13058 :
13059 : /*
13060 : * Now mark the pg_constraint row as validated (even if we didn't check,
13061 : * notably the ones for partitions on the referenced side).
13062 : *
13063 : * We rely on transaction abort to roll back this change if phase 3
13064 : * ultimately finds violating rows. This is a bit ugly.
13065 : */
13066 394 : copyTuple = heap_copytuple(contuple);
13067 394 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13068 394 : copy_con->convalidated = true;
13069 394 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13070 :
13071 394 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13072 :
13073 394 : heap_freetuple(copyTuple);
13074 394 : }
13075 :
13076 : /*
13077 : * QueueCheckConstraintValidation
13078 : *
13079 : * Add an entry to the wqueue to validate the given check constraint in Phase 3
13080 : * and update the convalidated field in the pg_constraint catalog for the
13081 : * specified relation and all its inheriting children.
13082 : */
13083 : static void
13084 126 : QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13085 : char *constrName, HeapTuple contuple,
13086 : bool recurse, bool recursing, LOCKMODE lockmode)
13087 : {
13088 : Form_pg_constraint con;
13089 : AlteredTableInfo *tab;
13090 : HeapTuple copyTuple;
13091 : Form_pg_constraint copy_con;
13092 :
13093 126 : List *children = NIL;
13094 : ListCell *child;
13095 : NewConstraint *newcon;
13096 : Datum val;
13097 : char *conbin;
13098 :
13099 126 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13100 : Assert(con->contype == CONSTRAINT_CHECK);
13101 :
13102 : /*
13103 : * If we're recursing, the parent has already done this, so skip it. Also,
13104 : * if the constraint is a NO INHERIT constraint, we shouldn't try to look
13105 : * for it in the children.
13106 : */
13107 126 : if (!recursing && !con->connoinherit)
13108 72 : children = find_all_inheritors(RelationGetRelid(rel),
13109 : lockmode, NULL);
13110 :
13111 : /*
13112 : * For CHECK constraints, we must ensure that we only mark the constraint
13113 : * as validated on the parent if it's already validated on the children.
13114 : *
13115 : * We recurse before validating on the parent, to reduce risk of
13116 : * deadlocks.
13117 : */
13118 246 : foreach(child, children)
13119 : {
13120 120 : Oid childoid = lfirst_oid(child);
13121 : Relation childrel;
13122 :
13123 120 : if (childoid == RelationGetRelid(rel))
13124 72 : continue;
13125 :
13126 : /*
13127 : * If we are told not to recurse, there had better not be any child
13128 : * tables, because we can't mark the constraint on the parent valid
13129 : * unless it is valid for all child tables.
13130 : */
13131 48 : if (!recurse)
13132 0 : ereport(ERROR,
13133 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13134 : errmsg("constraint must be validated on child tables too")));
13135 :
13136 : /* find_all_inheritors already got lock */
13137 48 : childrel = table_open(childoid, NoLock);
13138 :
13139 48 : ATExecValidateConstraint(wqueue, childrel, constrName, false,
13140 : true, lockmode);
13141 48 : table_close(childrel, NoLock);
13142 : }
13143 :
13144 : /* Queue validation for phase 3 */
13145 126 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
13146 126 : newcon->name = constrName;
13147 126 : newcon->contype = CONSTR_CHECK;
13148 126 : newcon->refrelid = InvalidOid;
13149 126 : newcon->refindid = InvalidOid;
13150 126 : newcon->conid = con->oid;
13151 :
13152 126 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
13153 : Anum_pg_constraint_conbin);
13154 126 : conbin = TextDatumGetCString(val);
13155 126 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
13156 :
13157 : /* Find or create work queue entry for this table */
13158 126 : tab = ATGetQueueEntry(wqueue, rel);
13159 126 : tab->constraints = lappend(tab->constraints, newcon);
13160 :
13161 : /*
13162 : * Invalidate relcache so that others see the new validated constraint.
13163 : */
13164 126 : CacheInvalidateRelcache(rel);
13165 :
13166 : /*
13167 : * Now update the catalog, while we have the door open.
13168 : */
13169 126 : copyTuple = heap_copytuple(contuple);
13170 126 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13171 126 : copy_con->convalidated = true;
13172 126 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13173 :
13174 126 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13175 :
13176 126 : heap_freetuple(copyTuple);
13177 126 : }
13178 :
13179 : /*
13180 : * QueueNNConstraintValidation
13181 : *
13182 : * Add an entry to the wqueue to validate the given not-null constraint in
13183 : * Phase 3 and update the convalidated field in the pg_constraint catalog for
13184 : * the specified relation and all its inheriting children.
13185 : */
13186 : static void
13187 112 : QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13188 : HeapTuple contuple, bool recurse, bool recursing,
13189 : LOCKMODE lockmode)
13190 : {
13191 : Form_pg_constraint con;
13192 : AlteredTableInfo *tab;
13193 : HeapTuple copyTuple;
13194 : Form_pg_constraint copy_con;
13195 112 : List *children = NIL;
13196 : AttrNumber attnum;
13197 : char *colname;
13198 :
13199 112 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13200 : Assert(con->contype == CONSTRAINT_NOTNULL);
13201 :
13202 112 : attnum = extractNotNullColumn(contuple);
13203 :
13204 : /*
13205 : * If we're recursing, we've already done this for parent, so skip it.
13206 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't try to
13207 : * look for it in the children.
13208 : *
13209 : * We recurse before validating on the parent, to reduce risk of
13210 : * deadlocks.
13211 : */
13212 112 : if (!recursing && !con->connoinherit)
13213 76 : children = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
13214 :
13215 112 : colname = get_attname(RelationGetRelid(rel), attnum, false);
13216 378 : foreach_oid(childoid, children)
13217 : {
13218 : Relation childrel;
13219 : HeapTuple contup;
13220 : Form_pg_constraint childcon;
13221 : char *conname;
13222 :
13223 154 : if (childoid == RelationGetRelid(rel))
13224 76 : continue;
13225 :
13226 : /*
13227 : * If we are told not to recurse, there had better not be any child
13228 : * tables, because we can't mark the constraint on the parent valid
13229 : * unless it is valid for all child tables.
13230 : */
13231 78 : if (!recurse)
13232 0 : ereport(ERROR,
13233 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13234 : errmsg("constraint must be validated on child tables too"));
13235 :
13236 : /*
13237 : * The column on child might have a different attnum, so search by
13238 : * column name.
13239 : */
13240 78 : contup = findNotNullConstraint(childoid, colname);
13241 78 : if (!contup)
13242 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
13243 : colname, get_rel_name(childoid));
13244 78 : childcon = (Form_pg_constraint) GETSTRUCT(contup);
13245 78 : if (childcon->convalidated)
13246 42 : continue;
13247 :
13248 : /* find_all_inheritors already got lock */
13249 36 : childrel = table_open(childoid, NoLock);
13250 36 : conname = pstrdup(NameStr(childcon->conname));
13251 :
13252 : /* XXX improve ATExecValidateConstraint API to avoid double search */
13253 36 : ATExecValidateConstraint(wqueue, childrel, conname,
13254 : false, true, lockmode);
13255 36 : table_close(childrel, NoLock);
13256 : }
13257 :
13258 : /* Set attnotnull appropriately without queueing another validation */
13259 112 : set_attnotnull(NULL, rel, attnum, true, false);
13260 :
13261 112 : tab = ATGetQueueEntry(wqueue, rel);
13262 112 : tab->verify_new_notnull = true;
13263 :
13264 : /*
13265 : * Invalidate relcache so that others see the new validated constraint.
13266 : */
13267 112 : CacheInvalidateRelcache(rel);
13268 :
13269 : /*
13270 : * Now update the catalogs, while we have the door open.
13271 : */
13272 112 : copyTuple = heap_copytuple(contuple);
13273 112 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13274 112 : copy_con->convalidated = true;
13275 112 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13276 :
13277 112 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13278 :
13279 112 : heap_freetuple(copyTuple);
13280 112 : }
13281 :
13282 : /*
13283 : * transformColumnNameList - transform list of column names
13284 : *
13285 : * Lookup each name and return its attnum and, optionally, type and collation
13286 : * OIDs
13287 : *
13288 : * Note: the name of this function suggests that it's general-purpose,
13289 : * but actually it's only used to look up names appearing in foreign-key
13290 : * clauses. The error messages would need work to use it in other cases,
13291 : * and perhaps the validity checks as well.
13292 : */
13293 : static int
13294 6598 : transformColumnNameList(Oid relId, List *colList,
13295 : int16 *attnums, Oid *atttypids, Oid *attcollids)
13296 : {
13297 : ListCell *l;
13298 : int attnum;
13299 :
13300 6598 : attnum = 0;
13301 12046 : foreach(l, colList)
13302 : {
13303 5514 : char *attname = strVal(lfirst(l));
13304 : HeapTuple atttuple;
13305 : Form_pg_attribute attform;
13306 :
13307 5514 : atttuple = SearchSysCacheAttName(relId, attname);
13308 5514 : if (!HeapTupleIsValid(atttuple))
13309 54 : ereport(ERROR,
13310 : (errcode(ERRCODE_UNDEFINED_COLUMN),
13311 : errmsg("column \"%s\" referenced in foreign key constraint does not exist",
13312 : attname)));
13313 5460 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
13314 5460 : if (attform->attnum < 0)
13315 12 : ereport(ERROR,
13316 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
13317 : errmsg("system columns cannot be used in foreign keys")));
13318 5448 : if (attnum >= INDEX_MAX_KEYS)
13319 0 : ereport(ERROR,
13320 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
13321 : errmsg("cannot have more than %d keys in a foreign key",
13322 : INDEX_MAX_KEYS)));
13323 5448 : attnums[attnum] = attform->attnum;
13324 5448 : if (atttypids != NULL)
13325 5412 : atttypids[attnum] = attform->atttypid;
13326 5448 : if (attcollids != NULL)
13327 5412 : attcollids[attnum] = attform->attcollation;
13328 5448 : ReleaseSysCache(atttuple);
13329 5448 : attnum++;
13330 : }
13331 :
13332 6532 : return attnum;
13333 : }
13334 :
13335 : /*
13336 : * transformFkeyGetPrimaryKey -
13337 : *
13338 : * Look up the names, attnums, types, and collations of the primary key attributes
13339 : * for the pkrel. Also return the index OID and index opclasses of the
13340 : * index supporting the primary key. Also return whether the index has
13341 : * WITHOUT OVERLAPS.
13342 : *
13343 : * All parameters except pkrel are output parameters. Also, the function
13344 : * return value is the number of attributes in the primary key.
13345 : *
13346 : * Used when the column list in the REFERENCES specification is omitted.
13347 : */
13348 : static int
13349 1256 : transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
13350 : List **attnamelist,
13351 : int16 *attnums, Oid *atttypids, Oid *attcollids,
13352 : Oid *opclasses, bool *pk_has_without_overlaps)
13353 : {
13354 : List *indexoidlist;
13355 : ListCell *indexoidscan;
13356 1256 : HeapTuple indexTuple = NULL;
13357 1256 : Form_pg_index indexStruct = NULL;
13358 : Datum indclassDatum;
13359 : oidvector *indclass;
13360 : int i;
13361 :
13362 : /*
13363 : * Get the list of index OIDs for the table from the relcache, and look up
13364 : * each one in the pg_index syscache until we find one marked primary key
13365 : * (hopefully there isn't more than one such). Insist it's valid, too.
13366 : */
13367 1256 : *indexOid = InvalidOid;
13368 :
13369 1256 : indexoidlist = RelationGetIndexList(pkrel);
13370 :
13371 1262 : foreach(indexoidscan, indexoidlist)
13372 : {
13373 1262 : Oid indexoid = lfirst_oid(indexoidscan);
13374 :
13375 1262 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13376 1262 : if (!HeapTupleIsValid(indexTuple))
13377 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13378 1262 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13379 1262 : if (indexStruct->indisprimary && indexStruct->indisvalid)
13380 : {
13381 : /*
13382 : * Refuse to use a deferrable primary key. This is per SQL spec,
13383 : * and there would be a lot of interesting semantic problems if we
13384 : * tried to allow it.
13385 : */
13386 1256 : if (!indexStruct->indimmediate)
13387 0 : ereport(ERROR,
13388 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13389 : errmsg("cannot use a deferrable primary key for referenced table \"%s\"",
13390 : RelationGetRelationName(pkrel))));
13391 :
13392 1256 : *indexOid = indexoid;
13393 1256 : break;
13394 : }
13395 6 : ReleaseSysCache(indexTuple);
13396 : }
13397 :
13398 1256 : list_free(indexoidlist);
13399 :
13400 : /*
13401 : * Check that we found it
13402 : */
13403 1256 : if (!OidIsValid(*indexOid))
13404 0 : ereport(ERROR,
13405 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13406 : errmsg("there is no primary key for referenced table \"%s\"",
13407 : RelationGetRelationName(pkrel))));
13408 :
13409 : /* Must get indclass the hard way */
13410 1256 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13411 : Anum_pg_index_indclass);
13412 1256 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13413 :
13414 : /*
13415 : * Now build the list of PK attributes from the indkey definition (we
13416 : * assume a primary key cannot have expressional elements)
13417 : */
13418 1256 : *attnamelist = NIL;
13419 2990 : for (i = 0; i < indexStruct->indnkeyatts; i++)
13420 : {
13421 1734 : int pkattno = indexStruct->indkey.values[i];
13422 :
13423 1734 : attnums[i] = pkattno;
13424 1734 : atttypids[i] = attnumTypeId(pkrel, pkattno);
13425 1734 : attcollids[i] = attnumCollationId(pkrel, pkattno);
13426 1734 : opclasses[i] = indclass->values[i];
13427 1734 : *attnamelist = lappend(*attnamelist,
13428 1734 : makeString(pstrdup(NameStr(*attnumAttName(pkrel, pkattno)))));
13429 : }
13430 :
13431 1256 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13432 :
13433 1256 : ReleaseSysCache(indexTuple);
13434 :
13435 1256 : return i;
13436 : }
13437 :
13438 : /*
13439 : * transformFkeyCheckAttrs -
13440 : *
13441 : * Validate that the 'attnums' columns in the 'pkrel' relation are valid to
13442 : * reference as part of a foreign key constraint.
13443 : *
13444 : * Returns the OID of the unique index supporting the constraint and
13445 : * populates the caller-provided 'opclasses' array with the opclasses
13446 : * associated with the index columns. Also sets whether the index
13447 : * uses WITHOUT OVERLAPS.
13448 : *
13449 : * Raises an ERROR on validation failure.
13450 : */
13451 : static Oid
13452 1282 : transformFkeyCheckAttrs(Relation pkrel,
13453 : int numattrs, int16 *attnums,
13454 : bool with_period, Oid *opclasses,
13455 : bool *pk_has_without_overlaps)
13456 : {
13457 1282 : Oid indexoid = InvalidOid;
13458 1282 : bool found = false;
13459 1282 : bool found_deferrable = false;
13460 : List *indexoidlist;
13461 : ListCell *indexoidscan;
13462 : int i,
13463 : j;
13464 :
13465 : /*
13466 : * Reject duplicate appearances of columns in the referenced-columns list.
13467 : * Such a case is forbidden by the SQL standard, and even if we thought it
13468 : * useful to allow it, there would be ambiguity about how to match the
13469 : * list to unique indexes (in particular, it'd be unclear which index
13470 : * opclass goes with which FK column).
13471 : */
13472 2992 : for (i = 0; i < numattrs; i++)
13473 : {
13474 2256 : for (j = i + 1; j < numattrs; j++)
13475 : {
13476 546 : if (attnums[i] == attnums[j])
13477 24 : ereport(ERROR,
13478 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13479 : errmsg("foreign key referenced-columns list must not contain duplicates")));
13480 : }
13481 : }
13482 :
13483 : /*
13484 : * Get the list of index OIDs for the table from the relcache, and look up
13485 : * each one in the pg_index syscache, and match unique indexes to the list
13486 : * of attnums we are given.
13487 : */
13488 1258 : indexoidlist = RelationGetIndexList(pkrel);
13489 :
13490 1438 : foreach(indexoidscan, indexoidlist)
13491 : {
13492 : HeapTuple indexTuple;
13493 : Form_pg_index indexStruct;
13494 :
13495 1426 : indexoid = lfirst_oid(indexoidscan);
13496 1426 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13497 1426 : if (!HeapTupleIsValid(indexTuple))
13498 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13499 1426 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13500 :
13501 : /*
13502 : * Must have the right number of columns; must be unique (or if
13503 : * temporal then exclusion instead) and not a partial index; forget it
13504 : * if there are any expressions, too. Invalid indexes are out as well.
13505 : */
13506 2744 : if (indexStruct->indnkeyatts == numattrs &&
13507 1318 : (with_period ? indexStruct->indisexclusion : indexStruct->indisunique) &&
13508 2608 : indexStruct->indisvalid &&
13509 2608 : heap_attisnull(indexTuple, Anum_pg_index_indpred, NULL) &&
13510 1304 : heap_attisnull(indexTuple, Anum_pg_index_indexprs, NULL))
13511 : {
13512 : Datum indclassDatum;
13513 : oidvector *indclass;
13514 :
13515 : /* Must get indclass the hard way */
13516 1304 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13517 : Anum_pg_index_indclass);
13518 1304 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13519 :
13520 : /*
13521 : * The given attnum list may match the index columns in any order.
13522 : * Check for a match, and extract the appropriate opclasses while
13523 : * we're at it.
13524 : *
13525 : * We know that attnums[] is duplicate-free per the test at the
13526 : * start of this function, and we checked above that the number of
13527 : * index columns agrees, so if we find a match for each attnums[]
13528 : * entry then we must have a one-to-one match in some order.
13529 : */
13530 3002 : for (i = 0; i < numattrs; i++)
13531 : {
13532 1756 : found = false;
13533 2336 : for (j = 0; j < numattrs; j++)
13534 : {
13535 2278 : if (attnums[i] == indexStruct->indkey.values[j])
13536 : {
13537 1698 : opclasses[i] = indclass->values[j];
13538 1698 : found = true;
13539 1698 : break;
13540 : }
13541 : }
13542 1756 : if (!found)
13543 58 : break;
13544 : }
13545 : /* The last attribute in the index must be the PERIOD FK part */
13546 1304 : if (found && with_period)
13547 : {
13548 122 : int16 periodattnum = attnums[numattrs - 1];
13549 :
13550 122 : found = (periodattnum == indexStruct->indkey.values[numattrs - 1]);
13551 : }
13552 :
13553 : /*
13554 : * Refuse to use a deferrable unique/primary key. This is per SQL
13555 : * spec, and there would be a lot of interesting semantic problems
13556 : * if we tried to allow it.
13557 : */
13558 1304 : if (found && !indexStruct->indimmediate)
13559 : {
13560 : /*
13561 : * Remember that we found an otherwise matching index, so that
13562 : * we can generate a more appropriate error message.
13563 : */
13564 0 : found_deferrable = true;
13565 0 : found = false;
13566 : }
13567 :
13568 : /* We need to know whether the index has WITHOUT OVERLAPS */
13569 1304 : if (found)
13570 1246 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13571 : }
13572 1426 : ReleaseSysCache(indexTuple);
13573 1426 : if (found)
13574 1246 : break;
13575 : }
13576 :
13577 1258 : if (!found)
13578 : {
13579 12 : if (found_deferrable)
13580 0 : ereport(ERROR,
13581 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13582 : errmsg("cannot use a deferrable unique constraint for referenced table \"%s\"",
13583 : RelationGetRelationName(pkrel))));
13584 : else
13585 12 : ereport(ERROR,
13586 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13587 : errmsg("there is no unique constraint matching given keys for referenced table \"%s\"",
13588 : RelationGetRelationName(pkrel))));
13589 : }
13590 :
13591 1246 : list_free(indexoidlist);
13592 :
13593 1246 : return indexoid;
13594 : }
13595 :
13596 : /*
13597 : * findFkeyCast -
13598 : *
13599 : * Wrapper around find_coercion_pathway() for ATAddForeignKeyConstraint().
13600 : * Caller has equal regard for binary coercibility and for an exact match.
13601 : */
13602 : static CoercionPathType
13603 12 : findFkeyCast(Oid targetTypeId, Oid sourceTypeId, Oid *funcid)
13604 : {
13605 : CoercionPathType ret;
13606 :
13607 12 : if (targetTypeId == sourceTypeId)
13608 : {
13609 12 : ret = COERCION_PATH_RELABELTYPE;
13610 12 : *funcid = InvalidOid;
13611 : }
13612 : else
13613 : {
13614 0 : ret = find_coercion_pathway(targetTypeId, sourceTypeId,
13615 : COERCION_IMPLICIT, funcid);
13616 0 : if (ret == COERCION_PATH_NONE)
13617 : /* A previously-relied-upon cast is now gone. */
13618 0 : elog(ERROR, "could not find cast from %u to %u",
13619 : sourceTypeId, targetTypeId);
13620 : }
13621 :
13622 12 : return ret;
13623 : }
13624 :
13625 : /*
13626 : * Permissions checks on the referenced table for ADD FOREIGN KEY
13627 : *
13628 : * Note: we have already checked that the user owns the referencing table,
13629 : * else we'd have failed much earlier; no additional checks are needed for it.
13630 : */
13631 : static void
13632 2466 : checkFkeyPermissions(Relation rel, int16 *attnums, int natts)
13633 : {
13634 2466 : Oid roleid = GetUserId();
13635 : AclResult aclresult;
13636 : int i;
13637 :
13638 : /* Okay if we have relation-level REFERENCES permission */
13639 2466 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), roleid,
13640 : ACL_REFERENCES);
13641 2466 : if (aclresult == ACLCHECK_OK)
13642 2466 : return;
13643 : /* Else we must have REFERENCES on each column */
13644 0 : for (i = 0; i < natts; i++)
13645 : {
13646 0 : aclresult = pg_attribute_aclcheck(RelationGetRelid(rel), attnums[i],
13647 : roleid, ACL_REFERENCES);
13648 0 : if (aclresult != ACLCHECK_OK)
13649 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
13650 0 : RelationGetRelationName(rel));
13651 : }
13652 : }
13653 :
13654 : /*
13655 : * Scan the existing rows in a table to verify they meet a proposed FK
13656 : * constraint.
13657 : *
13658 : * Caller must have opened and locked both relations appropriately.
13659 : */
13660 : static void
13661 1166 : validateForeignKeyConstraint(char *conname,
13662 : Relation rel,
13663 : Relation pkrel,
13664 : Oid pkindOid,
13665 : Oid constraintOid,
13666 : bool hasperiod)
13667 : {
13668 : TupleTableSlot *slot;
13669 : TableScanDesc scan;
13670 1166 : Trigger trig = {0};
13671 : Snapshot snapshot;
13672 : MemoryContext oldcxt;
13673 : MemoryContext perTupCxt;
13674 :
13675 1166 : ereport(DEBUG1,
13676 : (errmsg_internal("validating foreign key constraint \"%s\"", conname)));
13677 :
13678 : /*
13679 : * Build a trigger call structure; we'll need it either way.
13680 : */
13681 1166 : trig.tgoid = InvalidOid;
13682 1166 : trig.tgname = conname;
13683 1166 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
13684 1166 : trig.tgisinternal = true;
13685 1166 : trig.tgconstrrelid = RelationGetRelid(pkrel);
13686 1166 : trig.tgconstrindid = pkindOid;
13687 1166 : trig.tgconstraint = constraintOid;
13688 1166 : trig.tgdeferrable = false;
13689 1166 : trig.tginitdeferred = false;
13690 : /* we needn't fill in remaining fields */
13691 :
13692 : /*
13693 : * See if we can do it with a single LEFT JOIN query. A false result
13694 : * indicates we must proceed with the fire-the-trigger method. We can't do
13695 : * a LEFT JOIN for temporal FKs yet, but we can once we support temporal
13696 : * left joins.
13697 : */
13698 1166 : if (!hasperiod && RI_Initial_Check(&trig, rel, pkrel))
13699 984 : return;
13700 :
13701 : /*
13702 : * Scan through each tuple, calling RI_FKey_check_ins (insert trigger) as
13703 : * if that tuple had just been inserted. If any of those fail, it should
13704 : * ereport(ERROR) and that's that.
13705 : */
13706 108 : snapshot = RegisterSnapshot(GetLatestSnapshot());
13707 108 : slot = table_slot_create(rel, NULL);
13708 108 : scan = table_beginscan(rel, snapshot, 0, NULL);
13709 :
13710 108 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
13711 : "validateForeignKeyConstraint",
13712 : ALLOCSET_SMALL_SIZES);
13713 108 : oldcxt = MemoryContextSwitchTo(perTupCxt);
13714 :
13715 192 : while (table_scan_getnextslot(scan, ForwardScanDirection, slot))
13716 : {
13717 102 : LOCAL_FCINFO(fcinfo, 0);
13718 102 : TriggerData trigdata = {0};
13719 :
13720 102 : CHECK_FOR_INTERRUPTS();
13721 :
13722 : /*
13723 : * Make a call to the trigger function
13724 : *
13725 : * No parameters are passed, but we do set a context
13726 : */
13727 510 : MemSet(fcinfo, 0, SizeForFunctionCallInfo(0));
13728 :
13729 : /*
13730 : * We assume RI_FKey_check_ins won't look at flinfo...
13731 : */
13732 102 : trigdata.type = T_TriggerData;
13733 102 : trigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
13734 102 : trigdata.tg_relation = rel;
13735 102 : trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, false, NULL);
13736 102 : trigdata.tg_trigslot = slot;
13737 102 : trigdata.tg_trigger = &trig;
13738 :
13739 102 : fcinfo->context = (Node *) &trigdata;
13740 :
13741 102 : RI_FKey_check_ins(fcinfo);
13742 :
13743 84 : MemoryContextReset(perTupCxt);
13744 : }
13745 :
13746 90 : MemoryContextSwitchTo(oldcxt);
13747 90 : MemoryContextDelete(perTupCxt);
13748 90 : table_endscan(scan);
13749 90 : UnregisterSnapshot(snapshot);
13750 90 : ExecDropSingleTupleTableSlot(slot);
13751 : }
13752 :
13753 : /*
13754 : * CreateFKCheckTrigger
13755 : * Creates the insert (on_insert=true) or update "check" trigger that
13756 : * implements a given foreign key
13757 : *
13758 : * Returns the OID of the so created trigger.
13759 : */
13760 : static Oid
13761 5944 : CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
13762 : Oid constraintOid, Oid indexOid, Oid parentTrigOid,
13763 : bool on_insert)
13764 : {
13765 : ObjectAddress trigAddress;
13766 : CreateTrigStmt *fk_trigger;
13767 :
13768 : /*
13769 : * Note: for a self-referential FK (referencing and referenced tables are
13770 : * the same), it is important that the ON UPDATE action fires before the
13771 : * CHECK action, since both triggers will fire on the same row during an
13772 : * UPDATE event; otherwise the CHECK trigger will be checking a non-final
13773 : * state of the row. Triggers fire in name order, so we ensure this by
13774 : * using names like "RI_ConstraintTrigger_a_NNNN" for the action triggers
13775 : * and "RI_ConstraintTrigger_c_NNNN" for the check triggers.
13776 : */
13777 5944 : fk_trigger = makeNode(CreateTrigStmt);
13778 5944 : fk_trigger->replace = false;
13779 5944 : fk_trigger->isconstraint = true;
13780 5944 : fk_trigger->trigname = "RI_ConstraintTrigger_c";
13781 5944 : fk_trigger->relation = NULL;
13782 :
13783 : /* Either ON INSERT or ON UPDATE */
13784 5944 : if (on_insert)
13785 : {
13786 2972 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
13787 2972 : fk_trigger->events = TRIGGER_TYPE_INSERT;
13788 : }
13789 : else
13790 : {
13791 2972 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
13792 2972 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
13793 : }
13794 :
13795 5944 : fk_trigger->args = NIL;
13796 5944 : fk_trigger->row = true;
13797 5944 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13798 5944 : fk_trigger->columns = NIL;
13799 5944 : fk_trigger->whenClause = NULL;
13800 5944 : fk_trigger->transitionRels = NIL;
13801 5944 : fk_trigger->deferrable = fkconstraint->deferrable;
13802 5944 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13803 5944 : fk_trigger->constrrel = NULL;
13804 :
13805 5944 : trigAddress = CreateTrigger(fk_trigger, NULL, myRelOid, refRelOid,
13806 : constraintOid, indexOid, InvalidOid,
13807 : parentTrigOid, NULL, true, false);
13808 :
13809 : /* Make changes-so-far visible */
13810 5944 : CommandCounterIncrement();
13811 :
13812 5944 : return trigAddress.objectId;
13813 : }
13814 :
13815 : /*
13816 : * createForeignKeyActionTriggers
13817 : * Create the referenced-side "action" triggers that implement a foreign
13818 : * key.
13819 : *
13820 : * Returns the OIDs of the so created triggers in *deleteTrigOid and
13821 : * *updateTrigOid.
13822 : */
13823 : static void
13824 3402 : createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
13825 : Oid constraintOid, Oid indexOid,
13826 : Oid parentDelTrigger, Oid parentUpdTrigger,
13827 : Oid *deleteTrigOid, Oid *updateTrigOid)
13828 : {
13829 : CreateTrigStmt *fk_trigger;
13830 : ObjectAddress trigAddress;
13831 :
13832 : /*
13833 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
13834 : * DELETE action on the referenced table.
13835 : */
13836 3402 : fk_trigger = makeNode(CreateTrigStmt);
13837 3402 : fk_trigger->replace = false;
13838 3402 : fk_trigger->isconstraint = true;
13839 3402 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
13840 3402 : fk_trigger->relation = NULL;
13841 3402 : fk_trigger->args = NIL;
13842 3402 : fk_trigger->row = true;
13843 3402 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13844 3402 : fk_trigger->events = TRIGGER_TYPE_DELETE;
13845 3402 : fk_trigger->columns = NIL;
13846 3402 : fk_trigger->whenClause = NULL;
13847 3402 : fk_trigger->transitionRels = NIL;
13848 3402 : fk_trigger->constrrel = NULL;
13849 :
13850 3402 : switch (fkconstraint->fk_del_action)
13851 : {
13852 2750 : case FKCONSTR_ACTION_NOACTION:
13853 2750 : fk_trigger->deferrable = fkconstraint->deferrable;
13854 2750 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13855 2750 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_del");
13856 2750 : break;
13857 30 : case FKCONSTR_ACTION_RESTRICT:
13858 30 : fk_trigger->deferrable = false;
13859 30 : fk_trigger->initdeferred = false;
13860 30 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_del");
13861 30 : break;
13862 464 : case FKCONSTR_ACTION_CASCADE:
13863 464 : fk_trigger->deferrable = false;
13864 464 : fk_trigger->initdeferred = false;
13865 464 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_del");
13866 464 : break;
13867 98 : case FKCONSTR_ACTION_SETNULL:
13868 98 : fk_trigger->deferrable = false;
13869 98 : fk_trigger->initdeferred = false;
13870 98 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_del");
13871 98 : break;
13872 60 : case FKCONSTR_ACTION_SETDEFAULT:
13873 60 : fk_trigger->deferrable = false;
13874 60 : fk_trigger->initdeferred = false;
13875 60 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_del");
13876 60 : break;
13877 0 : default:
13878 0 : elog(ERROR, "unrecognized FK action type: %d",
13879 : (int) fkconstraint->fk_del_action);
13880 : break;
13881 : }
13882 :
13883 3402 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
13884 : constraintOid, indexOid, InvalidOid,
13885 : parentDelTrigger, NULL, true, false);
13886 3402 : if (deleteTrigOid)
13887 3402 : *deleteTrigOid = trigAddress.objectId;
13888 :
13889 : /* Make changes-so-far visible */
13890 3402 : CommandCounterIncrement();
13891 :
13892 : /*
13893 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
13894 : * UPDATE action on the referenced table.
13895 : */
13896 3402 : fk_trigger = makeNode(CreateTrigStmt);
13897 3402 : fk_trigger->replace = false;
13898 3402 : fk_trigger->isconstraint = true;
13899 3402 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
13900 3402 : fk_trigger->relation = NULL;
13901 3402 : fk_trigger->args = NIL;
13902 3402 : fk_trigger->row = true;
13903 3402 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13904 3402 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
13905 3402 : fk_trigger->columns = NIL;
13906 3402 : fk_trigger->whenClause = NULL;
13907 3402 : fk_trigger->transitionRels = NIL;
13908 3402 : fk_trigger->constrrel = NULL;
13909 :
13910 3402 : switch (fkconstraint->fk_upd_action)
13911 : {
13912 2944 : case FKCONSTR_ACTION_NOACTION:
13913 2944 : fk_trigger->deferrable = fkconstraint->deferrable;
13914 2944 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13915 2944 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_upd");
13916 2944 : break;
13917 36 : case FKCONSTR_ACTION_RESTRICT:
13918 36 : fk_trigger->deferrable = false;
13919 36 : fk_trigger->initdeferred = false;
13920 36 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_upd");
13921 36 : break;
13922 318 : case FKCONSTR_ACTION_CASCADE:
13923 318 : fk_trigger->deferrable = false;
13924 318 : fk_trigger->initdeferred = false;
13925 318 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_upd");
13926 318 : break;
13927 62 : case FKCONSTR_ACTION_SETNULL:
13928 62 : fk_trigger->deferrable = false;
13929 62 : fk_trigger->initdeferred = false;
13930 62 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_upd");
13931 62 : break;
13932 42 : case FKCONSTR_ACTION_SETDEFAULT:
13933 42 : fk_trigger->deferrable = false;
13934 42 : fk_trigger->initdeferred = false;
13935 42 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_upd");
13936 42 : break;
13937 0 : default:
13938 0 : elog(ERROR, "unrecognized FK action type: %d",
13939 : (int) fkconstraint->fk_upd_action);
13940 : break;
13941 : }
13942 :
13943 3402 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
13944 : constraintOid, indexOid, InvalidOid,
13945 : parentUpdTrigger, NULL, true, false);
13946 3402 : if (updateTrigOid)
13947 3402 : *updateTrigOid = trigAddress.objectId;
13948 3402 : }
13949 :
13950 : /*
13951 : * createForeignKeyCheckTriggers
13952 : * Create the referencing-side "check" triggers that implement a foreign
13953 : * key.
13954 : *
13955 : * Returns the OIDs of the so created triggers in *insertTrigOid and
13956 : * *updateTrigOid.
13957 : */
13958 : static void
13959 2972 : createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
13960 : Constraint *fkconstraint, Oid constraintOid,
13961 : Oid indexOid,
13962 : Oid parentInsTrigger, Oid parentUpdTrigger,
13963 : Oid *insertTrigOid, Oid *updateTrigOid)
13964 : {
13965 2972 : *insertTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
13966 : constraintOid, indexOid,
13967 : parentInsTrigger, true);
13968 2972 : *updateTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
13969 : constraintOid, indexOid,
13970 : parentUpdTrigger, false);
13971 2972 : }
13972 :
13973 : /*
13974 : * ALTER TABLE DROP CONSTRAINT
13975 : *
13976 : * Like DROP COLUMN, we can't use the normal ALTER TABLE recursion mechanism.
13977 : */
13978 : static void
13979 812 : ATExecDropConstraint(Relation rel, const char *constrName,
13980 : DropBehavior behavior, bool recurse,
13981 : bool missing_ok, LOCKMODE lockmode)
13982 : {
13983 : Relation conrel;
13984 : SysScanDesc scan;
13985 : ScanKeyData skey[3];
13986 : HeapTuple tuple;
13987 812 : bool found = false;
13988 :
13989 812 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
13990 :
13991 : /*
13992 : * Find and drop the target constraint
13993 : */
13994 812 : ScanKeyInit(&skey[0],
13995 : Anum_pg_constraint_conrelid,
13996 : BTEqualStrategyNumber, F_OIDEQ,
13997 : ObjectIdGetDatum(RelationGetRelid(rel)));
13998 812 : ScanKeyInit(&skey[1],
13999 : Anum_pg_constraint_contypid,
14000 : BTEqualStrategyNumber, F_OIDEQ,
14001 : ObjectIdGetDatum(InvalidOid));
14002 812 : ScanKeyInit(&skey[2],
14003 : Anum_pg_constraint_conname,
14004 : BTEqualStrategyNumber, F_NAMEEQ,
14005 : CStringGetDatum(constrName));
14006 812 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14007 : true, NULL, 3, skey);
14008 :
14009 : /* There can be at most one matching row */
14010 812 : if (HeapTupleIsValid(tuple = systable_getnext(scan)))
14011 : {
14012 776 : dropconstraint_internal(rel, tuple, behavior, recurse, false,
14013 : missing_ok, lockmode);
14014 590 : found = true;
14015 : }
14016 :
14017 626 : systable_endscan(scan);
14018 :
14019 626 : if (!found)
14020 : {
14021 36 : if (!missing_ok)
14022 24 : ereport(ERROR,
14023 : errcode(ERRCODE_UNDEFINED_OBJECT),
14024 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14025 : constrName, RelationGetRelationName(rel)));
14026 : else
14027 12 : ereport(NOTICE,
14028 : errmsg("constraint \"%s\" of relation \"%s\" does not exist, skipping",
14029 : constrName, RelationGetRelationName(rel)));
14030 : }
14031 :
14032 602 : table_close(conrel, RowExclusiveLock);
14033 602 : }
14034 :
14035 : /*
14036 : * Remove a constraint, using its pg_constraint tuple
14037 : *
14038 : * Implementation for ALTER TABLE DROP CONSTRAINT and ALTER TABLE ALTER COLUMN
14039 : * DROP NOT NULL.
14040 : *
14041 : * Returns the address of the constraint being removed.
14042 : */
14043 : static ObjectAddress
14044 1206 : dropconstraint_internal(Relation rel, HeapTuple constraintTup, DropBehavior behavior,
14045 : bool recurse, bool recursing, bool missing_ok,
14046 : LOCKMODE lockmode)
14047 : {
14048 : Relation conrel;
14049 : Form_pg_constraint con;
14050 : ObjectAddress conobj;
14051 : List *children;
14052 1206 : bool is_no_inherit_constraint = false;
14053 : char *constrName;
14054 1206 : char *colname = NULL;
14055 :
14056 : /* Guard against stack overflow due to overly deep inheritance tree. */
14057 1206 : check_stack_depth();
14058 :
14059 : /* At top level, permission check was done in ATPrepCmd, else do it */
14060 1206 : if (recursing)
14061 210 : ATSimplePermissions(AT_DropConstraint, rel,
14062 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
14063 :
14064 1200 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14065 :
14066 1200 : con = (Form_pg_constraint) GETSTRUCT(constraintTup);
14067 1200 : constrName = NameStr(con->conname);
14068 :
14069 : /* Don't allow drop of inherited constraints */
14070 1200 : if (con->coninhcount > 0 && !recursing)
14071 156 : ereport(ERROR,
14072 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14073 : errmsg("cannot drop inherited constraint \"%s\" of relation \"%s\"",
14074 : constrName, RelationGetRelationName(rel))));
14075 :
14076 : /*
14077 : * Reset pg_constraint.attnotnull, if this is a not-null constraint.
14078 : *
14079 : * While doing that, we're in a good position to disallow dropping a not-
14080 : * null constraint underneath a primary key, a replica identity index, or
14081 : * a generated identity column.
14082 : */
14083 1044 : if (con->contype == CONSTRAINT_NOTNULL)
14084 : {
14085 314 : Relation attrel = table_open(AttributeRelationId, RowExclusiveLock);
14086 314 : AttrNumber attnum = extractNotNullColumn(constraintTup);
14087 : Bitmapset *pkattrs;
14088 : Bitmapset *irattrs;
14089 : HeapTuple atttup;
14090 : Form_pg_attribute attForm;
14091 :
14092 : /* save column name for recursion step */
14093 314 : colname = get_attname(RelationGetRelid(rel), attnum, false);
14094 :
14095 : /*
14096 : * Disallow if it's in the primary key. For partitioned tables we
14097 : * cannot rely solely on RelationGetIndexAttrBitmap, because it'll
14098 : * return NULL if the primary key is invalid; but we still need to
14099 : * protect not-null constraints under such a constraint, so check the
14100 : * slow way.
14101 : */
14102 314 : pkattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_PRIMARY_KEY);
14103 :
14104 314 : if (pkattrs == NULL &&
14105 278 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14106 : {
14107 18 : Oid pkindex = RelationGetPrimaryKeyIndex(rel, true);
14108 :
14109 18 : if (OidIsValid(pkindex))
14110 : {
14111 0 : Relation pk = relation_open(pkindex, AccessShareLock);
14112 :
14113 0 : pkattrs = NULL;
14114 0 : for (int i = 0; i < pk->rd_index->indnkeyatts; i++)
14115 0 : pkattrs = bms_add_member(pkattrs, pk->rd_index->indkey.values[i]);
14116 :
14117 0 : relation_close(pk, AccessShareLock);
14118 : }
14119 : }
14120 :
14121 350 : if (pkattrs &&
14122 36 : bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, pkattrs))
14123 24 : ereport(ERROR,
14124 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14125 : errmsg("column \"%s\" is in a primary key",
14126 : get_attname(RelationGetRelid(rel), attnum, false)));
14127 :
14128 : /* Disallow if it's in the replica identity */
14129 290 : irattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_IDENTITY_KEY);
14130 290 : if (bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, irattrs))
14131 12 : ereport(ERROR,
14132 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14133 : errmsg("column \"%s\" is in index used as replica identity",
14134 : get_attname(RelationGetRelid(rel), attnum, false)));
14135 :
14136 : /* Disallow if it's a GENERATED AS IDENTITY column */
14137 278 : atttup = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
14138 278 : if (!HeapTupleIsValid(atttup))
14139 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
14140 : attnum, RelationGetRelid(rel));
14141 278 : attForm = (Form_pg_attribute) GETSTRUCT(atttup);
14142 278 : if (attForm->attidentity != '\0')
14143 0 : ereport(ERROR,
14144 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
14145 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
14146 : get_attname(RelationGetRelid(rel), attnum,
14147 : false),
14148 : RelationGetRelationName(rel)));
14149 :
14150 : /* All good -- reset attnotnull if needed */
14151 278 : if (attForm->attnotnull)
14152 : {
14153 278 : attForm->attnotnull = false;
14154 278 : CatalogTupleUpdate(attrel, &atttup->t_self, atttup);
14155 : }
14156 :
14157 278 : table_close(attrel, RowExclusiveLock);
14158 : }
14159 :
14160 1008 : is_no_inherit_constraint = con->connoinherit;
14161 :
14162 : /*
14163 : * If it's a foreign-key constraint, we'd better lock the referenced table
14164 : * and check that that's not in use, just as we've already done for the
14165 : * constrained table (else we might, eg, be dropping a trigger that has
14166 : * unfired events). But we can/must skip that in the self-referential
14167 : * case.
14168 : */
14169 1008 : if (con->contype == CONSTRAINT_FOREIGN &&
14170 168 : con->confrelid != RelationGetRelid(rel))
14171 : {
14172 : Relation frel;
14173 :
14174 : /* Must match lock taken by RemoveTriggerById: */
14175 168 : frel = table_open(con->confrelid, AccessExclusiveLock);
14176 168 : CheckAlterTableIsSafe(frel);
14177 162 : table_close(frel, NoLock);
14178 : }
14179 :
14180 : /*
14181 : * Perform the actual constraint deletion
14182 : */
14183 1002 : ObjectAddressSet(conobj, ConstraintRelationId, con->oid);
14184 1002 : performDeletion(&conobj, behavior, 0);
14185 :
14186 : /*
14187 : * For partitioned tables, non-CHECK, non-NOT-NULL inherited constraints
14188 : * are dropped via the dependency mechanism, so we're done here.
14189 : */
14190 966 : if (con->contype != CONSTRAINT_CHECK &&
14191 630 : con->contype != CONSTRAINT_NOTNULL &&
14192 352 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14193 : {
14194 78 : table_close(conrel, RowExclusiveLock);
14195 78 : return conobj;
14196 : }
14197 :
14198 : /*
14199 : * Propagate to children as appropriate. Unlike most other ALTER
14200 : * routines, we have to do this one level of recursion at a time; we can't
14201 : * use find_all_inheritors to do it in one pass.
14202 : */
14203 888 : if (!is_no_inherit_constraint)
14204 602 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
14205 : else
14206 286 : children = NIL;
14207 :
14208 2148 : foreach_oid(childrelid, children)
14209 : {
14210 : Relation childrel;
14211 : HeapTuple tuple;
14212 : Form_pg_constraint childcon;
14213 :
14214 : /* find_inheritance_children already got lock */
14215 384 : childrel = table_open(childrelid, NoLock);
14216 384 : CheckAlterTableIsSafe(childrel);
14217 :
14218 : /*
14219 : * We search for not-null constraints by column name, and others by
14220 : * constraint name.
14221 : */
14222 384 : if (con->contype == CONSTRAINT_NOTNULL)
14223 : {
14224 148 : tuple = findNotNullConstraint(childrelid, colname);
14225 148 : if (!HeapTupleIsValid(tuple))
14226 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
14227 : colname, RelationGetRelid(childrel));
14228 : }
14229 : else
14230 : {
14231 : SysScanDesc scan;
14232 : ScanKeyData skey[3];
14233 :
14234 236 : ScanKeyInit(&skey[0],
14235 : Anum_pg_constraint_conrelid,
14236 : BTEqualStrategyNumber, F_OIDEQ,
14237 : ObjectIdGetDatum(childrelid));
14238 236 : ScanKeyInit(&skey[1],
14239 : Anum_pg_constraint_contypid,
14240 : BTEqualStrategyNumber, F_OIDEQ,
14241 : ObjectIdGetDatum(InvalidOid));
14242 236 : ScanKeyInit(&skey[2],
14243 : Anum_pg_constraint_conname,
14244 : BTEqualStrategyNumber, F_NAMEEQ,
14245 : CStringGetDatum(constrName));
14246 236 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14247 : true, NULL, 3, skey);
14248 : /* There can only be one, so no need to loop */
14249 236 : tuple = systable_getnext(scan);
14250 236 : if (!HeapTupleIsValid(tuple))
14251 0 : ereport(ERROR,
14252 : (errcode(ERRCODE_UNDEFINED_OBJECT),
14253 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14254 : constrName,
14255 : RelationGetRelationName(childrel))));
14256 236 : tuple = heap_copytuple(tuple);
14257 236 : systable_endscan(scan);
14258 : }
14259 :
14260 384 : childcon = (Form_pg_constraint) GETSTRUCT(tuple);
14261 :
14262 : /* Right now only CHECK and not-null constraints can be inherited */
14263 384 : if (childcon->contype != CONSTRAINT_CHECK &&
14264 148 : childcon->contype != CONSTRAINT_NOTNULL)
14265 0 : elog(ERROR, "inherited constraint is not a CHECK or not-null constraint");
14266 :
14267 384 : if (childcon->coninhcount <= 0) /* shouldn't happen */
14268 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
14269 : childrelid, NameStr(childcon->conname));
14270 :
14271 384 : if (recurse)
14272 : {
14273 : /*
14274 : * If the child constraint has other definition sources, just
14275 : * decrement its inheritance count; if not, recurse to delete it.
14276 : */
14277 282 : if (childcon->coninhcount == 1 && !childcon->conislocal)
14278 : {
14279 : /* Time to delete this child constraint, too */
14280 210 : dropconstraint_internal(childrel, tuple, behavior,
14281 : recurse, true, missing_ok,
14282 : lockmode);
14283 : }
14284 : else
14285 : {
14286 : /* Child constraint must survive my deletion */
14287 72 : childcon->coninhcount--;
14288 72 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14289 :
14290 : /* Make update visible */
14291 72 : CommandCounterIncrement();
14292 : }
14293 : }
14294 : else
14295 : {
14296 : /*
14297 : * If we were told to drop ONLY in this table (no recursion) and
14298 : * there are no further parents for this constraint, we need to
14299 : * mark the inheritors' constraints as locally defined rather than
14300 : * inherited.
14301 : */
14302 102 : childcon->coninhcount--;
14303 102 : if (childcon->coninhcount == 0)
14304 102 : childcon->conislocal = true;
14305 :
14306 102 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14307 :
14308 : /* Make update visible */
14309 102 : CommandCounterIncrement();
14310 : }
14311 :
14312 378 : heap_freetuple(tuple);
14313 :
14314 378 : table_close(childrel, NoLock);
14315 : }
14316 :
14317 882 : table_close(conrel, RowExclusiveLock);
14318 :
14319 882 : return conobj;
14320 : }
14321 :
14322 : /*
14323 : * ALTER COLUMN TYPE
14324 : *
14325 : * Unlike other subcommand types, we do parse transformation for ALTER COLUMN
14326 : * TYPE during phase 1 --- the AlterTableCmd passed in here is already
14327 : * transformed (and must be, because we rely on some transformed fields).
14328 : *
14329 : * The point of this is that the execution of all ALTER COLUMN TYPEs for a
14330 : * table will be done "in parallel" during phase 3, so all the USING
14331 : * expressions should be parsed assuming the original column types. Also,
14332 : * this allows a USING expression to refer to a field that will be dropped.
14333 : *
14334 : * To make this work safely, AT_PASS_DROP then AT_PASS_ALTER_TYPE must be
14335 : * the first two execution steps in phase 2; they must not see the effects
14336 : * of any other subcommand types, since the USING expressions are parsed
14337 : * against the unmodified table's state.
14338 : */
14339 : static void
14340 1312 : ATPrepAlterColumnType(List **wqueue,
14341 : AlteredTableInfo *tab, Relation rel,
14342 : bool recurse, bool recursing,
14343 : AlterTableCmd *cmd, LOCKMODE lockmode,
14344 : AlterTableUtilityContext *context)
14345 : {
14346 1312 : char *colName = cmd->name;
14347 1312 : ColumnDef *def = (ColumnDef *) cmd->def;
14348 1312 : TypeName *typeName = def->typeName;
14349 1312 : Node *transform = def->cooked_default;
14350 : HeapTuple tuple;
14351 : Form_pg_attribute attTup;
14352 : AttrNumber attnum;
14353 : Oid targettype;
14354 : int32 targettypmod;
14355 : Oid targetcollid;
14356 : NewColumnValue *newval;
14357 1312 : ParseState *pstate = make_parsestate(NULL);
14358 : AclResult aclresult;
14359 : bool is_expr;
14360 :
14361 1312 : pstate->p_sourcetext = context->queryString;
14362 :
14363 1312 : if (rel->rd_rel->reloftype && !recursing)
14364 6 : ereport(ERROR,
14365 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14366 : errmsg("cannot alter column type of typed table"),
14367 : parser_errposition(pstate, def->location)));
14368 :
14369 : /* lookup the attribute so we can check inheritance status */
14370 1306 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
14371 1306 : if (!HeapTupleIsValid(tuple))
14372 0 : ereport(ERROR,
14373 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14374 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14375 : colName, RelationGetRelationName(rel)),
14376 : parser_errposition(pstate, def->location)));
14377 1306 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
14378 1306 : attnum = attTup->attnum;
14379 :
14380 : /* Can't alter a system attribute */
14381 1306 : if (attnum <= 0)
14382 6 : ereport(ERROR,
14383 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14384 : errmsg("cannot alter system column \"%s\"", colName),
14385 : parser_errposition(pstate, def->location)));
14386 :
14387 : /*
14388 : * Cannot specify USING when altering type of a generated column, because
14389 : * that would violate the generation expression.
14390 : */
14391 1300 : if (attTup->attgenerated && def->cooked_default)
14392 12 : ereport(ERROR,
14393 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
14394 : errmsg("cannot specify USING when altering type of generated column"),
14395 : errdetail("Column \"%s\" is a generated column.", colName),
14396 : parser_errposition(pstate, def->location)));
14397 :
14398 : /*
14399 : * Don't alter inherited columns. At outer level, there had better not be
14400 : * any inherited definition; when recursing, we assume this was checked at
14401 : * the parent level (see below).
14402 : */
14403 1288 : if (attTup->attinhcount > 0 && !recursing)
14404 6 : ereport(ERROR,
14405 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14406 : errmsg("cannot alter inherited column \"%s\"", colName),
14407 : parser_errposition(pstate, def->location)));
14408 :
14409 : /* Don't alter columns used in the partition key */
14410 1282 : if (has_partition_attrs(rel,
14411 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
14412 : &is_expr))
14413 18 : ereport(ERROR,
14414 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14415 : errmsg("cannot alter column \"%s\" because it is part of the partition key of relation \"%s\"",
14416 : colName, RelationGetRelationName(rel)),
14417 : parser_errposition(pstate, def->location)));
14418 :
14419 : /* Look up the target type */
14420 1264 : typenameTypeIdAndMod(pstate, typeName, &targettype, &targettypmod);
14421 :
14422 1258 : aclresult = object_aclcheck(TypeRelationId, targettype, GetUserId(), ACL_USAGE);
14423 1258 : if (aclresult != ACLCHECK_OK)
14424 12 : aclcheck_error_type(aclresult, targettype);
14425 :
14426 : /* And the collation */
14427 1246 : targetcollid = GetColumnDefCollation(pstate, def, targettype);
14428 :
14429 : /* make sure datatype is legal for a column */
14430 2480 : CheckAttributeType(colName, targettype, targetcollid,
14431 1240 : list_make1_oid(rel->rd_rel->reltype),
14432 1240 : (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL ? CHKATYPE_IS_VIRTUAL : 0));
14433 :
14434 1228 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14435 : {
14436 : /* do nothing */
14437 : }
14438 1192 : else if (tab->relkind == RELKIND_RELATION ||
14439 202 : tab->relkind == RELKIND_PARTITIONED_TABLE)
14440 : {
14441 : /*
14442 : * Set up an expression to transform the old data value to the new
14443 : * type. If a USING option was given, use the expression as
14444 : * transformed by transformAlterTableStmt, else just take the old
14445 : * value and try to coerce it. We do this first so that type
14446 : * incompatibility can be detected before we waste effort, and because
14447 : * we need the expression to be parsed against the original table row
14448 : * type.
14449 : */
14450 1056 : if (!transform)
14451 : {
14452 828 : transform = (Node *) makeVar(1, attnum,
14453 : attTup->atttypid, attTup->atttypmod,
14454 : attTup->attcollation,
14455 : 0);
14456 : }
14457 :
14458 1056 : transform = coerce_to_target_type(pstate,
14459 : transform, exprType(transform),
14460 : targettype, targettypmod,
14461 : COERCION_ASSIGNMENT,
14462 : COERCE_IMPLICIT_CAST,
14463 : -1);
14464 1056 : if (transform == NULL)
14465 : {
14466 : /* error text depends on whether USING was specified or not */
14467 24 : if (def->cooked_default != NULL)
14468 6 : ereport(ERROR,
14469 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14470 : errmsg("result of USING clause for column \"%s\""
14471 : " cannot be cast automatically to type %s",
14472 : colName, format_type_be(targettype)),
14473 : errhint("You might need to add an explicit cast.")));
14474 : else
14475 18 : ereport(ERROR,
14476 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14477 : errmsg("column \"%s\" cannot be cast automatically to type %s",
14478 : colName, format_type_be(targettype)),
14479 : !attTup->attgenerated ?
14480 : /* translator: USING is SQL, don't translate it */
14481 : errhint("You might need to specify \"USING %s::%s\".",
14482 : quote_identifier(colName),
14483 : format_type_with_typemod(targettype,
14484 : targettypmod)) : 0));
14485 : }
14486 :
14487 : /* Fix collations after all else */
14488 1032 : assign_expr_collations(pstate, transform);
14489 :
14490 : /* Expand virtual generated columns in the expr. */
14491 1032 : transform = expand_generated_columns_in_expr(transform, rel, 1);
14492 :
14493 : /* Plan the expr now so we can accurately assess the need to rewrite. */
14494 1032 : transform = (Node *) expression_planner((Expr *) transform);
14495 :
14496 : /*
14497 : * Add a work queue item to make ATRewriteTable update the column
14498 : * contents.
14499 : */
14500 1032 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
14501 1032 : newval->attnum = attnum;
14502 1032 : newval->expr = (Expr *) transform;
14503 1032 : newval->is_generated = false;
14504 :
14505 1032 : tab->newvals = lappend(tab->newvals, newval);
14506 1032 : if (ATColumnChangeRequiresRewrite(transform, attnum))
14507 836 : tab->rewrite |= AT_REWRITE_COLUMN_REWRITE;
14508 : }
14509 136 : else if (transform)
14510 12 : ereport(ERROR,
14511 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14512 : errmsg("\"%s\" is not a table",
14513 : RelationGetRelationName(rel))));
14514 :
14515 1192 : if (!RELKIND_HAS_STORAGE(tab->relkind) || attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14516 : {
14517 : /*
14518 : * For relations or columns without storage, do this check now.
14519 : * Regular tables will check it later when the table is being
14520 : * rewritten.
14521 : */
14522 226 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
14523 : }
14524 :
14525 1144 : ReleaseSysCache(tuple);
14526 :
14527 : /*
14528 : * Recurse manually by queueing a new command for each child, if
14529 : * necessary. We cannot apply ATSimpleRecursion here because we need to
14530 : * remap attribute numbers in the USING expression, if any.
14531 : *
14532 : * If we are told not to recurse, there had better not be any child
14533 : * tables; else the alter would put them out of step.
14534 : */
14535 1144 : if (recurse)
14536 : {
14537 886 : Oid relid = RelationGetRelid(rel);
14538 : List *child_oids,
14539 : *child_numparents;
14540 : ListCell *lo,
14541 : *li;
14542 :
14543 886 : child_oids = find_all_inheritors(relid, lockmode,
14544 : &child_numparents);
14545 :
14546 : /*
14547 : * find_all_inheritors does the recursive search of the inheritance
14548 : * hierarchy, so all we have to do is process all of the relids in the
14549 : * list that it returns.
14550 : */
14551 1980 : forboth(lo, child_oids, li, child_numparents)
14552 : {
14553 1118 : Oid childrelid = lfirst_oid(lo);
14554 1118 : int numparents = lfirst_int(li);
14555 : Relation childrel;
14556 : HeapTuple childtuple;
14557 : Form_pg_attribute childattTup;
14558 :
14559 1118 : if (childrelid == relid)
14560 886 : continue;
14561 :
14562 : /* find_all_inheritors already got lock */
14563 232 : childrel = relation_open(childrelid, NoLock);
14564 232 : CheckAlterTableIsSafe(childrel);
14565 :
14566 : /*
14567 : * Verify that the child doesn't have any inherited definitions of
14568 : * this column that came from outside this inheritance hierarchy.
14569 : * (renameatt makes a similar test, though in a different way
14570 : * because of its different recursion mechanism.)
14571 : */
14572 232 : childtuple = SearchSysCacheAttName(RelationGetRelid(childrel),
14573 : colName);
14574 232 : if (!HeapTupleIsValid(childtuple))
14575 0 : ereport(ERROR,
14576 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14577 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14578 : colName, RelationGetRelationName(childrel))));
14579 232 : childattTup = (Form_pg_attribute) GETSTRUCT(childtuple);
14580 :
14581 232 : if (childattTup->attinhcount > numparents)
14582 6 : ereport(ERROR,
14583 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14584 : errmsg("cannot alter inherited column \"%s\" of relation \"%s\"",
14585 : colName, RelationGetRelationName(childrel))));
14586 :
14587 226 : ReleaseSysCache(childtuple);
14588 :
14589 : /*
14590 : * Remap the attribute numbers. If no USING expression was
14591 : * specified, there is no need for this step.
14592 : */
14593 226 : if (def->cooked_default)
14594 : {
14595 : AttrMap *attmap;
14596 : bool found_whole_row;
14597 :
14598 : /* create a copy to scribble on */
14599 78 : cmd = copyObject(cmd);
14600 :
14601 78 : attmap = build_attrmap_by_name(RelationGetDescr(childrel),
14602 : RelationGetDescr(rel),
14603 : false);
14604 156 : ((ColumnDef *) cmd->def)->cooked_default =
14605 78 : map_variable_attnos(def->cooked_default,
14606 : 1, 0,
14607 : attmap,
14608 : InvalidOid, &found_whole_row);
14609 78 : if (found_whole_row)
14610 6 : ereport(ERROR,
14611 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14612 : errmsg("cannot convert whole-row table reference"),
14613 : errdetail("USING expression contains a whole-row table reference.")));
14614 72 : pfree(attmap);
14615 : }
14616 220 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
14617 208 : relation_close(childrel, NoLock);
14618 : }
14619 : }
14620 308 : else if (!recursing &&
14621 50 : find_inheritance_children(RelationGetRelid(rel), NoLock) != NIL)
14622 0 : ereport(ERROR,
14623 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14624 : errmsg("type of inherited column \"%s\" must be changed in child tables too",
14625 : colName)));
14626 :
14627 1120 : if (tab->relkind == RELKIND_COMPOSITE_TYPE)
14628 50 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
14629 1114 : }
14630 :
14631 : /*
14632 : * When the data type of a column is changed, a rewrite might not be required
14633 : * if the new type is sufficiently identical to the old one, and the USING
14634 : * clause isn't trying to insert some other value. It's safe to skip the
14635 : * rewrite in these cases:
14636 : *
14637 : * - the old type is binary coercible to the new type
14638 : * - the new type is an unconstrained domain over the old type
14639 : * - {NEW,OLD} or {OLD,NEW} is {timestamptz,timestamp} and the timezone is UTC
14640 : *
14641 : * In the case of a constrained domain, we could get by with scanning the
14642 : * table and checking the constraint rather than actually rewriting it, but we
14643 : * don't currently try to do that.
14644 : */
14645 : static bool
14646 1032 : ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno)
14647 : {
14648 : Assert(expr != NULL);
14649 :
14650 : for (;;)
14651 : {
14652 : /* only one varno, so no need to check that */
14653 1150 : if (IsA(expr, Var) && ((Var *) expr)->varattno == varattno)
14654 196 : return false;
14655 954 : else if (IsA(expr, RelabelType))
14656 106 : expr = (Node *) ((RelabelType *) expr)->arg;
14657 848 : else if (IsA(expr, CoerceToDomain))
14658 : {
14659 0 : CoerceToDomain *d = (CoerceToDomain *) expr;
14660 :
14661 0 : if (DomainHasConstraints(d->resulttype))
14662 0 : return true;
14663 0 : expr = (Node *) d->arg;
14664 : }
14665 848 : else if (IsA(expr, FuncExpr))
14666 : {
14667 642 : FuncExpr *f = (FuncExpr *) expr;
14668 :
14669 642 : switch (f->funcid)
14670 : {
14671 18 : case F_TIMESTAMPTZ_TIMESTAMP:
14672 : case F_TIMESTAMP_TIMESTAMPTZ:
14673 18 : if (TimestampTimestampTzRequiresRewrite())
14674 6 : return true;
14675 : else
14676 12 : expr = linitial(f->args);
14677 12 : break;
14678 624 : default:
14679 624 : return true;
14680 : }
14681 : }
14682 : else
14683 206 : return true;
14684 : }
14685 : }
14686 :
14687 : /*
14688 : * ALTER COLUMN .. SET DATA TYPE
14689 : *
14690 : * Return the address of the modified column.
14691 : */
14692 : static ObjectAddress
14693 1078 : ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
14694 : AlterTableCmd *cmd, LOCKMODE lockmode)
14695 : {
14696 1078 : char *colName = cmd->name;
14697 1078 : ColumnDef *def = (ColumnDef *) cmd->def;
14698 1078 : TypeName *typeName = def->typeName;
14699 : HeapTuple heapTup;
14700 : Form_pg_attribute attTup,
14701 : attOldTup;
14702 : AttrNumber attnum;
14703 : HeapTuple typeTuple;
14704 : Form_pg_type tform;
14705 : Oid targettype;
14706 : int32 targettypmod;
14707 : Oid targetcollid;
14708 : Node *defaultexpr;
14709 : Relation attrelation;
14710 : Relation depRel;
14711 : ScanKeyData key[3];
14712 : SysScanDesc scan;
14713 : HeapTuple depTup;
14714 : ObjectAddress address;
14715 :
14716 : /*
14717 : * Clear all the missing values if we're rewriting the table, since this
14718 : * renders them pointless.
14719 : */
14720 1078 : if (tab->rewrite)
14721 : {
14722 : Relation newrel;
14723 :
14724 776 : newrel = table_open(RelationGetRelid(rel), NoLock);
14725 776 : RelationClearMissing(newrel);
14726 776 : relation_close(newrel, NoLock);
14727 : /* make sure we don't conflict with later attribute modifications */
14728 776 : CommandCounterIncrement();
14729 : }
14730 :
14731 1078 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
14732 :
14733 : /* Look up the target column */
14734 1078 : heapTup = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
14735 1078 : if (!HeapTupleIsValid(heapTup)) /* shouldn't happen */
14736 0 : ereport(ERROR,
14737 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14738 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14739 : colName, RelationGetRelationName(rel))));
14740 1078 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
14741 1078 : attnum = attTup->attnum;
14742 1078 : attOldTup = TupleDescAttr(tab->oldDesc, attnum - 1);
14743 :
14744 : /* Check for multiple ALTER TYPE on same column --- can't cope */
14745 1078 : if (attTup->atttypid != attOldTup->atttypid ||
14746 1078 : attTup->atttypmod != attOldTup->atttypmod)
14747 0 : ereport(ERROR,
14748 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14749 : errmsg("cannot alter type of column \"%s\" twice",
14750 : colName)));
14751 :
14752 : /* Look up the target type (should not fail, since prep found it) */
14753 1078 : typeTuple = typenameType(NULL, typeName, &targettypmod);
14754 1078 : tform = (Form_pg_type) GETSTRUCT(typeTuple);
14755 1078 : targettype = tform->oid;
14756 : /* And the collation */
14757 1078 : targetcollid = GetColumnDefCollation(NULL, def, targettype);
14758 :
14759 : /*
14760 : * If there is a default expression for the column, get it and ensure we
14761 : * can coerce it to the new datatype. (We must do this before changing
14762 : * the column type, because build_column_default itself will try to
14763 : * coerce, and will not issue the error message we want if it fails.)
14764 : *
14765 : * We remove any implicit coercion steps at the top level of the old
14766 : * default expression; this has been agreed to satisfy the principle of
14767 : * least surprise. (The conversion to the new column type should act like
14768 : * it started from what the user sees as the stored expression, and the
14769 : * implicit coercions aren't going to be shown.)
14770 : */
14771 1078 : if (attTup->atthasdef)
14772 : {
14773 92 : defaultexpr = build_column_default(rel, attnum);
14774 : Assert(defaultexpr);
14775 92 : defaultexpr = strip_implicit_coercions(defaultexpr);
14776 92 : defaultexpr = coerce_to_target_type(NULL, /* no UNKNOWN params */
14777 : defaultexpr, exprType(defaultexpr),
14778 : targettype, targettypmod,
14779 : COERCION_ASSIGNMENT,
14780 : COERCE_IMPLICIT_CAST,
14781 : -1);
14782 92 : if (defaultexpr == NULL)
14783 : {
14784 6 : if (attTup->attgenerated)
14785 0 : ereport(ERROR,
14786 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14787 : errmsg("generation expression for column \"%s\" cannot be cast automatically to type %s",
14788 : colName, format_type_be(targettype))));
14789 : else
14790 6 : ereport(ERROR,
14791 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14792 : errmsg("default for column \"%s\" cannot be cast automatically to type %s",
14793 : colName, format_type_be(targettype))));
14794 : }
14795 : }
14796 : else
14797 986 : defaultexpr = NULL;
14798 :
14799 : /*
14800 : * Find everything that depends on the column (constraints, indexes, etc),
14801 : * and record enough information to let us recreate the objects.
14802 : *
14803 : * The actual recreation does not happen here, but only after we have
14804 : * performed all the individual ALTER TYPE operations. We have to save
14805 : * the info before executing ALTER TYPE, though, else the deparser will
14806 : * get confused.
14807 : */
14808 1072 : RememberAllDependentForRebuilding(tab, AT_AlterColumnType, rel, attnum, colName);
14809 :
14810 : /*
14811 : * Now scan for dependencies of this column on other things. The only
14812 : * things we should find are the dependency on the column datatype and
14813 : * possibly a collation dependency. Those can be removed.
14814 : */
14815 1036 : depRel = table_open(DependRelationId, RowExclusiveLock);
14816 :
14817 1036 : ScanKeyInit(&key[0],
14818 : Anum_pg_depend_classid,
14819 : BTEqualStrategyNumber, F_OIDEQ,
14820 : ObjectIdGetDatum(RelationRelationId));
14821 1036 : ScanKeyInit(&key[1],
14822 : Anum_pg_depend_objid,
14823 : BTEqualStrategyNumber, F_OIDEQ,
14824 : ObjectIdGetDatum(RelationGetRelid(rel)));
14825 1036 : ScanKeyInit(&key[2],
14826 : Anum_pg_depend_objsubid,
14827 : BTEqualStrategyNumber, F_INT4EQ,
14828 : Int32GetDatum((int32) attnum));
14829 :
14830 1036 : scan = systable_beginscan(depRel, DependDependerIndexId, true,
14831 : NULL, 3, key);
14832 :
14833 1040 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
14834 : {
14835 4 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
14836 : ObjectAddress foundObject;
14837 :
14838 4 : foundObject.classId = foundDep->refclassid;
14839 4 : foundObject.objectId = foundDep->refobjid;
14840 4 : foundObject.objectSubId = foundDep->refobjsubid;
14841 :
14842 4 : if (foundDep->deptype != DEPENDENCY_NORMAL)
14843 0 : elog(ERROR, "found unexpected dependency type '%c'",
14844 : foundDep->deptype);
14845 4 : if (!(foundDep->refclassid == TypeRelationId &&
14846 4 : foundDep->refobjid == attTup->atttypid) &&
14847 0 : !(foundDep->refclassid == CollationRelationId &&
14848 0 : foundDep->refobjid == attTup->attcollation))
14849 0 : elog(ERROR, "found unexpected dependency for column: %s",
14850 : getObjectDescription(&foundObject, false));
14851 :
14852 4 : CatalogTupleDelete(depRel, &depTup->t_self);
14853 : }
14854 :
14855 1036 : systable_endscan(scan);
14856 :
14857 1036 : table_close(depRel, RowExclusiveLock);
14858 :
14859 : /*
14860 : * Here we go --- change the recorded column type and collation. (Note
14861 : * heapTup is a copy of the syscache entry, so okay to scribble on.) First
14862 : * fix up the missing value if any.
14863 : */
14864 1036 : if (attTup->atthasmissing)
14865 : {
14866 : Datum missingval;
14867 : bool missingNull;
14868 :
14869 : /* if rewrite is true the missing value should already be cleared */
14870 : Assert(tab->rewrite == 0);
14871 :
14872 : /* Get the missing value datum */
14873 6 : missingval = heap_getattr(heapTup,
14874 : Anum_pg_attribute_attmissingval,
14875 : attrelation->rd_att,
14876 : &missingNull);
14877 :
14878 : /* if it's a null array there is nothing to do */
14879 :
14880 6 : if (!missingNull)
14881 : {
14882 : /*
14883 : * Get the datum out of the array and repack it in a new array
14884 : * built with the new type data. We assume that since the table
14885 : * doesn't need rewriting, the actual Datum doesn't need to be
14886 : * changed, only the array metadata.
14887 : */
14888 :
14889 6 : int one = 1;
14890 : bool isNull;
14891 6 : Datum valuesAtt[Natts_pg_attribute] = {0};
14892 6 : bool nullsAtt[Natts_pg_attribute] = {0};
14893 6 : bool replacesAtt[Natts_pg_attribute] = {0};
14894 : HeapTuple newTup;
14895 :
14896 12 : missingval = array_get_element(missingval,
14897 : 1,
14898 : &one,
14899 : 0,
14900 6 : attTup->attlen,
14901 6 : attTup->attbyval,
14902 6 : attTup->attalign,
14903 : &isNull);
14904 6 : missingval = PointerGetDatum(construct_array(&missingval,
14905 : 1,
14906 : targettype,
14907 6 : tform->typlen,
14908 6 : tform->typbyval,
14909 6 : tform->typalign));
14910 :
14911 6 : valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
14912 6 : replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;
14913 6 : nullsAtt[Anum_pg_attribute_attmissingval - 1] = false;
14914 :
14915 6 : newTup = heap_modify_tuple(heapTup, RelationGetDescr(attrelation),
14916 : valuesAtt, nullsAtt, replacesAtt);
14917 6 : heap_freetuple(heapTup);
14918 6 : heapTup = newTup;
14919 6 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
14920 : }
14921 : }
14922 :
14923 1036 : attTup->atttypid = targettype;
14924 1036 : attTup->atttypmod = targettypmod;
14925 1036 : attTup->attcollation = targetcollid;
14926 1036 : if (list_length(typeName->arrayBounds) > PG_INT16_MAX)
14927 0 : ereport(ERROR,
14928 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
14929 : errmsg("too many array dimensions"));
14930 1036 : attTup->attndims = list_length(typeName->arrayBounds);
14931 1036 : attTup->attlen = tform->typlen;
14932 1036 : attTup->attbyval = tform->typbyval;
14933 1036 : attTup->attalign = tform->typalign;
14934 1036 : attTup->attstorage = tform->typstorage;
14935 1036 : attTup->attcompression = InvalidCompressionMethod;
14936 :
14937 1036 : ReleaseSysCache(typeTuple);
14938 :
14939 1036 : CatalogTupleUpdate(attrelation, &heapTup->t_self, heapTup);
14940 :
14941 1036 : table_close(attrelation, RowExclusiveLock);
14942 :
14943 : /* Install dependencies on new datatype and collation */
14944 1036 : add_column_datatype_dependency(RelationGetRelid(rel), attnum, targettype);
14945 1036 : add_column_collation_dependency(RelationGetRelid(rel), attnum, targetcollid);
14946 :
14947 : /*
14948 : * Drop any pg_statistic entry for the column, since it's now wrong type
14949 : */
14950 1036 : RemoveStatistics(RelationGetRelid(rel), attnum);
14951 :
14952 1036 : InvokeObjectPostAlterHook(RelationRelationId,
14953 : RelationGetRelid(rel), attnum);
14954 :
14955 : /*
14956 : * Update the default, if present, by brute force --- remove and re-add
14957 : * the default. Probably unsafe to take shortcuts, since the new version
14958 : * may well have additional dependencies. (It's okay to do this now,
14959 : * rather than after other ALTER TYPE commands, since the default won't
14960 : * depend on other column types.)
14961 : */
14962 1036 : if (defaultexpr)
14963 : {
14964 : /*
14965 : * If it's a GENERATED default, drop its dependency records, in
14966 : * particular its INTERNAL dependency on the column, which would
14967 : * otherwise cause dependency.c to refuse to perform the deletion.
14968 : */
14969 86 : if (attTup->attgenerated)
14970 : {
14971 36 : Oid attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
14972 :
14973 36 : if (!OidIsValid(attrdefoid))
14974 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
14975 : RelationGetRelid(rel), attnum);
14976 36 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
14977 : }
14978 :
14979 : /*
14980 : * Make updates-so-far visible, particularly the new pg_attribute row
14981 : * which will be updated again.
14982 : */
14983 86 : CommandCounterIncrement();
14984 :
14985 : /*
14986 : * We use RESTRICT here for safety, but at present we do not expect
14987 : * anything to depend on the default.
14988 : */
14989 86 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true,
14990 : true);
14991 :
14992 86 : (void) StoreAttrDefault(rel, attnum, defaultexpr, true);
14993 : }
14994 :
14995 1036 : ObjectAddressSubSet(address, RelationRelationId,
14996 : RelationGetRelid(rel), attnum);
14997 :
14998 : /* Cleanup */
14999 1036 : heap_freetuple(heapTup);
15000 :
15001 1036 : return address;
15002 : }
15003 :
15004 : /*
15005 : * Subroutine for ATExecAlterColumnType and ATExecSetExpression: Find everything
15006 : * that depends on the column (constraints, indexes, etc), and record enough
15007 : * information to let us recreate the objects.
15008 : */
15009 : static void
15010 1168 : RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
15011 : Relation rel, AttrNumber attnum, const char *colName)
15012 : {
15013 : Relation depRel;
15014 : ScanKeyData key[3];
15015 : SysScanDesc scan;
15016 : HeapTuple depTup;
15017 :
15018 : Assert(subtype == AT_AlterColumnType || subtype == AT_SetExpression);
15019 :
15020 1168 : depRel = table_open(DependRelationId, RowExclusiveLock);
15021 :
15022 1168 : ScanKeyInit(&key[0],
15023 : Anum_pg_depend_refclassid,
15024 : BTEqualStrategyNumber, F_OIDEQ,
15025 : ObjectIdGetDatum(RelationRelationId));
15026 1168 : ScanKeyInit(&key[1],
15027 : Anum_pg_depend_refobjid,
15028 : BTEqualStrategyNumber, F_OIDEQ,
15029 : ObjectIdGetDatum(RelationGetRelid(rel)));
15030 1168 : ScanKeyInit(&key[2],
15031 : Anum_pg_depend_refobjsubid,
15032 : BTEqualStrategyNumber, F_INT4EQ,
15033 : Int32GetDatum((int32) attnum));
15034 :
15035 1168 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
15036 : NULL, 3, key);
15037 :
15038 2348 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15039 : {
15040 1216 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15041 : ObjectAddress foundObject;
15042 :
15043 1216 : foundObject.classId = foundDep->classid;
15044 1216 : foundObject.objectId = foundDep->objid;
15045 1216 : foundObject.objectSubId = foundDep->objsubid;
15046 :
15047 1216 : switch (foundObject.classId)
15048 : {
15049 286 : case RelationRelationId:
15050 : {
15051 286 : char relKind = get_rel_relkind(foundObject.objectId);
15052 :
15053 286 : if (relKind == RELKIND_INDEX ||
15054 : relKind == RELKIND_PARTITIONED_INDEX)
15055 : {
15056 : Assert(foundObject.objectSubId == 0);
15057 248 : RememberIndexForRebuilding(foundObject.objectId, tab);
15058 : }
15059 38 : else if (relKind == RELKIND_SEQUENCE)
15060 : {
15061 : /*
15062 : * This must be a SERIAL column's sequence. We need
15063 : * not do anything to it.
15064 : */
15065 : Assert(foundObject.objectSubId == 0);
15066 : }
15067 : else
15068 : {
15069 : /* Not expecting any other direct dependencies... */
15070 0 : elog(ERROR, "unexpected object depending on column: %s",
15071 : getObjectDescription(&foundObject, false));
15072 : }
15073 286 : break;
15074 : }
15075 :
15076 686 : case ConstraintRelationId:
15077 : Assert(foundObject.objectSubId == 0);
15078 686 : RememberConstraintForRebuilding(foundObject.objectId, tab);
15079 686 : break;
15080 :
15081 0 : case ProcedureRelationId:
15082 :
15083 : /*
15084 : * A new-style SQL function can depend on a column, if that
15085 : * column is referenced in the parsed function body. Ideally
15086 : * we'd automatically update the function by deparsing and
15087 : * reparsing it, but that's risky and might well fail anyhow.
15088 : * FIXME someday.
15089 : *
15090 : * This is only a problem for AT_AlterColumnType, not
15091 : * AT_SetExpression.
15092 : */
15093 0 : if (subtype == AT_AlterColumnType)
15094 0 : ereport(ERROR,
15095 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15096 : errmsg("cannot alter type of a column used by a function or procedure"),
15097 : errdetail("%s depends on column \"%s\"",
15098 : getObjectDescription(&foundObject, false),
15099 : colName)));
15100 0 : break;
15101 :
15102 12 : case RewriteRelationId:
15103 :
15104 : /*
15105 : * View/rule bodies have pretty much the same issues as
15106 : * function bodies. FIXME someday.
15107 : */
15108 12 : if (subtype == AT_AlterColumnType)
15109 12 : ereport(ERROR,
15110 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15111 : errmsg("cannot alter type of a column used by a view or rule"),
15112 : errdetail("%s depends on column \"%s\"",
15113 : getObjectDescription(&foundObject, false),
15114 : colName)));
15115 0 : break;
15116 :
15117 0 : case TriggerRelationId:
15118 :
15119 : /*
15120 : * A trigger can depend on a column because the column is
15121 : * specified as an update target, or because the column is
15122 : * used in the trigger's WHEN condition. The first case would
15123 : * not require any extra work, but the second case would
15124 : * require updating the WHEN expression, which has the same
15125 : * issues as above. Since we can't easily tell which case
15126 : * applies, we punt for both. FIXME someday.
15127 : */
15128 0 : if (subtype == AT_AlterColumnType)
15129 0 : ereport(ERROR,
15130 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15131 : errmsg("cannot alter type of a column used in a trigger definition"),
15132 : errdetail("%s depends on column \"%s\"",
15133 : getObjectDescription(&foundObject, false),
15134 : colName)));
15135 0 : break;
15136 :
15137 0 : case PolicyRelationId:
15138 :
15139 : /*
15140 : * A policy can depend on a column because the column is
15141 : * specified in the policy's USING or WITH CHECK qual
15142 : * expressions. It might be possible to rewrite and recheck
15143 : * the policy expression, but punt for now. It's certainly
15144 : * easy enough to remove and recreate the policy; still, FIXME
15145 : * someday.
15146 : */
15147 0 : if (subtype == AT_AlterColumnType)
15148 0 : ereport(ERROR,
15149 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15150 : errmsg("cannot alter type of a column used in a policy definition"),
15151 : errdetail("%s depends on column \"%s\"",
15152 : getObjectDescription(&foundObject, false),
15153 : colName)));
15154 0 : break;
15155 :
15156 206 : case AttrDefaultRelationId:
15157 : {
15158 206 : ObjectAddress col = GetAttrDefaultColumnAddress(foundObject.objectId);
15159 :
15160 206 : if (col.objectId == RelationGetRelid(rel) &&
15161 206 : col.objectSubId == attnum)
15162 : {
15163 : /*
15164 : * Ignore the column's own default expression. The
15165 : * caller deals with it.
15166 : */
15167 : }
15168 : else
15169 : {
15170 : /*
15171 : * This must be a reference from the expression of a
15172 : * generated column elsewhere in the same table.
15173 : * Changing the type/generated expression of a column
15174 : * that is used by a generated column is not allowed
15175 : * by SQL standard, so just punt for now. It might be
15176 : * doable with some thinking and effort.
15177 : */
15178 24 : if (subtype == AT_AlterColumnType)
15179 24 : ereport(ERROR,
15180 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15181 : errmsg("cannot alter type of a column used by a generated column"),
15182 : errdetail("Column \"%s\" is used by generated column \"%s\".",
15183 : colName,
15184 : get_attname(col.objectId,
15185 : col.objectSubId,
15186 : false))));
15187 : }
15188 182 : break;
15189 : }
15190 :
15191 26 : case StatisticExtRelationId:
15192 :
15193 : /*
15194 : * Give the extended-stats machinery a chance to fix anything
15195 : * that this column type change would break.
15196 : */
15197 26 : RememberStatisticsForRebuilding(foundObject.objectId, tab);
15198 26 : break;
15199 :
15200 0 : case PublicationRelRelationId:
15201 :
15202 : /*
15203 : * Column reference in a PUBLICATION ... FOR TABLE ... WHERE
15204 : * clause. Same issues as above. FIXME someday.
15205 : */
15206 0 : if (subtype == AT_AlterColumnType)
15207 0 : ereport(ERROR,
15208 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15209 : errmsg("cannot alter type of a column used by a publication WHERE clause"),
15210 : errdetail("%s depends on column \"%s\"",
15211 : getObjectDescription(&foundObject, false),
15212 : colName)));
15213 0 : break;
15214 :
15215 0 : default:
15216 :
15217 : /*
15218 : * We don't expect any other sorts of objects to depend on a
15219 : * column.
15220 : */
15221 0 : elog(ERROR, "unexpected object depending on column: %s",
15222 : getObjectDescription(&foundObject, false));
15223 : break;
15224 : }
15225 : }
15226 :
15227 1132 : systable_endscan(scan);
15228 1132 : table_close(depRel, NoLock);
15229 1132 : }
15230 :
15231 : /*
15232 : * Subroutine for ATExecAlterColumnType: remember that a replica identity
15233 : * needs to be reset.
15234 : */
15235 : static void
15236 456 : RememberReplicaIdentityForRebuilding(Oid indoid, AlteredTableInfo *tab)
15237 : {
15238 456 : if (!get_index_isreplident(indoid))
15239 438 : return;
15240 :
15241 18 : if (tab->replicaIdentityIndex)
15242 0 : elog(ERROR, "relation %u has multiple indexes marked as replica identity", tab->relid);
15243 :
15244 18 : tab->replicaIdentityIndex = get_rel_name(indoid);
15245 : }
15246 :
15247 : /*
15248 : * Subroutine for ATExecAlterColumnType: remember any clustered index.
15249 : */
15250 : static void
15251 456 : RememberClusterOnForRebuilding(Oid indoid, AlteredTableInfo *tab)
15252 : {
15253 456 : if (!get_index_isclustered(indoid))
15254 438 : return;
15255 :
15256 18 : if (tab->clusterOnIndex)
15257 0 : elog(ERROR, "relation %u has multiple clustered indexes", tab->relid);
15258 :
15259 18 : tab->clusterOnIndex = get_rel_name(indoid);
15260 : }
15261 :
15262 : /*
15263 : * Subroutine for ATExecAlterColumnType: remember that a constraint needs
15264 : * to be rebuilt (which we might already know).
15265 : */
15266 : static void
15267 698 : RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab)
15268 : {
15269 : /*
15270 : * This de-duplication check is critical for two independent reasons: we
15271 : * mustn't try to recreate the same constraint twice, and if a constraint
15272 : * depends on more than one column whose type is to be altered, we must
15273 : * capture its definition string before applying any of the column type
15274 : * changes. ruleutils.c will get confused if we ask again later.
15275 : */
15276 698 : if (!list_member_oid(tab->changedConstraintOids, conoid))
15277 : {
15278 : /* OK, capture the constraint's existing definition string */
15279 608 : char *defstring = pg_get_constraintdef_command(conoid);
15280 : Oid indoid;
15281 :
15282 : /*
15283 : * It is critical to create not-null constraints ahead of primary key
15284 : * indexes; otherwise, the not-null constraint would be created by the
15285 : * primary key, and the constraint name would be wrong.
15286 : */
15287 608 : if (get_constraint_type(conoid) == CONSTRAINT_NOTNULL)
15288 : {
15289 198 : tab->changedConstraintOids = lcons_oid(conoid,
15290 : tab->changedConstraintOids);
15291 198 : tab->changedConstraintDefs = lcons(defstring,
15292 : tab->changedConstraintDefs);
15293 : }
15294 : else
15295 : {
15296 :
15297 410 : tab->changedConstraintOids = lappend_oid(tab->changedConstraintOids,
15298 : conoid);
15299 410 : tab->changedConstraintDefs = lappend(tab->changedConstraintDefs,
15300 : defstring);
15301 : }
15302 :
15303 : /*
15304 : * For the index of a constraint, if any, remember if it is used for
15305 : * the table's replica identity or if it is a clustered index, so that
15306 : * ATPostAlterTypeCleanup() can queue up commands necessary to restore
15307 : * those properties.
15308 : */
15309 608 : indoid = get_constraint_index(conoid);
15310 608 : if (OidIsValid(indoid))
15311 : {
15312 228 : RememberReplicaIdentityForRebuilding(indoid, tab);
15313 228 : RememberClusterOnForRebuilding(indoid, tab);
15314 : }
15315 : }
15316 698 : }
15317 :
15318 : /*
15319 : * Subroutine for ATExecAlterColumnType: remember that an index needs
15320 : * to be rebuilt (which we might already know).
15321 : */
15322 : static void
15323 248 : RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab)
15324 : {
15325 : /*
15326 : * This de-duplication check is critical for two independent reasons: we
15327 : * mustn't try to recreate the same index twice, and if an index depends
15328 : * on more than one column whose type is to be altered, we must capture
15329 : * its definition string before applying any of the column type changes.
15330 : * ruleutils.c will get confused if we ask again later.
15331 : */
15332 248 : if (!list_member_oid(tab->changedIndexOids, indoid))
15333 : {
15334 : /*
15335 : * Before adding it as an index-to-rebuild, we'd better see if it
15336 : * belongs to a constraint, and if so rebuild the constraint instead.
15337 : * Typically this check fails, because constraint indexes normally
15338 : * have only dependencies on their constraint. But it's possible for
15339 : * such an index to also have direct dependencies on table columns,
15340 : * for example with a partial exclusion constraint.
15341 : */
15342 240 : Oid conoid = get_index_constraint(indoid);
15343 :
15344 240 : if (OidIsValid(conoid))
15345 : {
15346 12 : RememberConstraintForRebuilding(conoid, tab);
15347 : }
15348 : else
15349 : {
15350 : /* OK, capture the index's existing definition string */
15351 228 : char *defstring = pg_get_indexdef_string(indoid);
15352 :
15353 228 : tab->changedIndexOids = lappend_oid(tab->changedIndexOids,
15354 : indoid);
15355 228 : tab->changedIndexDefs = lappend(tab->changedIndexDefs,
15356 : defstring);
15357 :
15358 : /*
15359 : * Remember if this index is used for the table's replica identity
15360 : * or if it is a clustered index, so that ATPostAlterTypeCleanup()
15361 : * can queue up commands necessary to restore those properties.
15362 : */
15363 228 : RememberReplicaIdentityForRebuilding(indoid, tab);
15364 228 : RememberClusterOnForRebuilding(indoid, tab);
15365 : }
15366 : }
15367 248 : }
15368 :
15369 : /*
15370 : * Subroutine for ATExecAlterColumnType: remember that a statistics object
15371 : * needs to be rebuilt (which we might already know).
15372 : */
15373 : static void
15374 26 : RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab)
15375 : {
15376 : /*
15377 : * This de-duplication check is critical for two independent reasons: we
15378 : * mustn't try to recreate the same statistics object twice, and if the
15379 : * statistics object depends on more than one column whose type is to be
15380 : * altered, we must capture its definition string before applying any of
15381 : * the type changes. ruleutils.c will get confused if we ask again later.
15382 : */
15383 26 : if (!list_member_oid(tab->changedStatisticsOids, stxoid))
15384 : {
15385 : /* OK, capture the statistics object's existing definition string */
15386 26 : char *defstring = pg_get_statisticsobjdef_string(stxoid);
15387 :
15388 26 : tab->changedStatisticsOids = lappend_oid(tab->changedStatisticsOids,
15389 : stxoid);
15390 26 : tab->changedStatisticsDefs = lappend(tab->changedStatisticsDefs,
15391 : defstring);
15392 : }
15393 26 : }
15394 :
15395 : /*
15396 : * Cleanup after we've finished all the ALTER TYPE or SET EXPRESSION
15397 : * operations for a particular relation. We have to drop and recreate all the
15398 : * indexes and constraints that depend on the altered columns. We do the
15399 : * actual dropping here, but re-creation is managed by adding work queue
15400 : * entries to do those steps later.
15401 : */
15402 : static void
15403 1180 : ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode)
15404 : {
15405 : ObjectAddress obj;
15406 : ObjectAddresses *objects;
15407 : ListCell *def_item;
15408 : ListCell *oid_item;
15409 :
15410 : /*
15411 : * Collect all the constraints and indexes to drop so we can process them
15412 : * in a single call. That way we don't have to worry about dependencies
15413 : * among them.
15414 : */
15415 1180 : objects = new_object_addresses();
15416 :
15417 : /*
15418 : * Re-parse the index and constraint definitions, and attach them to the
15419 : * appropriate work queue entries. We do this before dropping because in
15420 : * the case of a constraint on another table, we might not yet have
15421 : * exclusive lock on the table the constraint is attached to, and we need
15422 : * to get that before reparsing/dropping. (That's possible at least for
15423 : * FOREIGN KEY, CHECK, and EXCLUSION constraints; in non-FK cases it
15424 : * requires a dependency on the target table's composite type in the other
15425 : * table's constraint expressions.)
15426 : *
15427 : * We can't rely on the output of deparsing to tell us which relation to
15428 : * operate on, because concurrent activity might have made the name
15429 : * resolve differently. Instead, we've got to use the OID of the
15430 : * constraint or index we're processing to figure out which relation to
15431 : * operate on.
15432 : */
15433 1788 : forboth(oid_item, tab->changedConstraintOids,
15434 : def_item, tab->changedConstraintDefs)
15435 : {
15436 608 : Oid oldId = lfirst_oid(oid_item);
15437 : HeapTuple tup;
15438 : Form_pg_constraint con;
15439 : Oid relid;
15440 : Oid confrelid;
15441 : bool conislocal;
15442 :
15443 608 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15444 608 : if (!HeapTupleIsValid(tup)) /* should not happen */
15445 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15446 608 : con = (Form_pg_constraint) GETSTRUCT(tup);
15447 608 : if (OidIsValid(con->conrelid))
15448 594 : relid = con->conrelid;
15449 : else
15450 : {
15451 : /* must be a domain constraint */
15452 14 : relid = get_typ_typrelid(getBaseType(con->contypid));
15453 14 : if (!OidIsValid(relid))
15454 0 : elog(ERROR, "could not identify relation associated with constraint %u", oldId);
15455 : }
15456 608 : confrelid = con->confrelid;
15457 608 : conislocal = con->conislocal;
15458 608 : ReleaseSysCache(tup);
15459 :
15460 608 : ObjectAddressSet(obj, ConstraintRelationId, oldId);
15461 608 : add_exact_object_address(&obj, objects);
15462 :
15463 : /*
15464 : * If the constraint is inherited (only), we don't want to inject a
15465 : * new definition here; it'll get recreated when
15466 : * ATAddCheckNNConstraint recurses from adding the parent table's
15467 : * constraint. But we had to carry the info this far so that we can
15468 : * drop the constraint below.
15469 : */
15470 608 : if (!conislocal)
15471 28 : continue;
15472 :
15473 : /*
15474 : * When rebuilding another table's constraint that references the
15475 : * table we're modifying, we might not yet have any lock on the other
15476 : * table, so get one now. We'll need AccessExclusiveLock for the DROP
15477 : * CONSTRAINT step, so there's no value in asking for anything weaker.
15478 : */
15479 580 : if (relid != tab->relid)
15480 48 : LockRelationOid(relid, AccessExclusiveLock);
15481 :
15482 580 : ATPostAlterTypeParse(oldId, relid, confrelid,
15483 580 : (char *) lfirst(def_item),
15484 580 : wqueue, lockmode, tab->rewrite);
15485 : }
15486 1408 : forboth(oid_item, tab->changedIndexOids,
15487 : def_item, tab->changedIndexDefs)
15488 : {
15489 228 : Oid oldId = lfirst_oid(oid_item);
15490 : Oid relid;
15491 :
15492 228 : relid = IndexGetRelation(oldId, false);
15493 :
15494 : /*
15495 : * As above, make sure we have lock on the index's table if it's not
15496 : * the same table.
15497 : */
15498 228 : if (relid != tab->relid)
15499 12 : LockRelationOid(relid, AccessExclusiveLock);
15500 :
15501 228 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15502 228 : (char *) lfirst(def_item),
15503 228 : wqueue, lockmode, tab->rewrite);
15504 :
15505 228 : ObjectAddressSet(obj, RelationRelationId, oldId);
15506 228 : add_exact_object_address(&obj, objects);
15507 : }
15508 :
15509 : /* add dependencies for new statistics */
15510 1206 : forboth(oid_item, tab->changedStatisticsOids,
15511 : def_item, tab->changedStatisticsDefs)
15512 : {
15513 26 : Oid oldId = lfirst_oid(oid_item);
15514 : Oid relid;
15515 :
15516 26 : relid = StatisticsGetRelation(oldId, false);
15517 :
15518 : /*
15519 : * As above, make sure we have lock on the statistics object's table
15520 : * if it's not the same table. However, we take
15521 : * ShareUpdateExclusiveLock here, aligning with the lock level used in
15522 : * CreateStatistics and RemoveStatisticsById.
15523 : *
15524 : * CAUTION: this should be done after all cases that grab
15525 : * AccessExclusiveLock, else we risk causing deadlock due to needing
15526 : * to promote our table lock.
15527 : */
15528 26 : if (relid != tab->relid)
15529 12 : LockRelationOid(relid, ShareUpdateExclusiveLock);
15530 :
15531 26 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15532 26 : (char *) lfirst(def_item),
15533 26 : wqueue, lockmode, tab->rewrite);
15534 :
15535 26 : ObjectAddressSet(obj, StatisticExtRelationId, oldId);
15536 26 : add_exact_object_address(&obj, objects);
15537 : }
15538 :
15539 : /*
15540 : * Queue up command to restore replica identity index marking
15541 : */
15542 1180 : if (tab->replicaIdentityIndex)
15543 : {
15544 18 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15545 18 : ReplicaIdentityStmt *subcmd = makeNode(ReplicaIdentityStmt);
15546 :
15547 18 : subcmd->identity_type = REPLICA_IDENTITY_INDEX;
15548 18 : subcmd->name = tab->replicaIdentityIndex;
15549 18 : cmd->subtype = AT_ReplicaIdentity;
15550 18 : cmd->def = (Node *) subcmd;
15551 :
15552 : /* do it after indexes and constraints */
15553 18 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15554 18 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15555 : }
15556 :
15557 : /*
15558 : * Queue up command to restore marking of index used for cluster.
15559 : */
15560 1180 : if (tab->clusterOnIndex)
15561 : {
15562 18 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15563 :
15564 18 : cmd->subtype = AT_ClusterOn;
15565 18 : cmd->name = tab->clusterOnIndex;
15566 :
15567 : /* do it after indexes and constraints */
15568 18 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15569 18 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15570 : }
15571 :
15572 : /*
15573 : * It should be okay to use DROP_RESTRICT here, since nothing else should
15574 : * be depending on these objects.
15575 : */
15576 1180 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
15577 :
15578 1180 : free_object_addresses(objects);
15579 :
15580 : /*
15581 : * The objects will get recreated during subsequent passes over the work
15582 : * queue.
15583 : */
15584 1180 : }
15585 :
15586 : /*
15587 : * Parse the previously-saved definition string for a constraint, index or
15588 : * statistics object against the newly-established column data type(s), and
15589 : * queue up the resulting command parsetrees for execution.
15590 : *
15591 : * This might fail if, for example, you have a WHERE clause that uses an
15592 : * operator that's not available for the new column type.
15593 : */
15594 : static void
15595 834 : ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
15596 : List **wqueue, LOCKMODE lockmode, bool rewrite)
15597 : {
15598 : List *raw_parsetree_list;
15599 : List *querytree_list;
15600 : ListCell *list_item;
15601 : Relation rel;
15602 :
15603 : /*
15604 : * We expect that we will get only ALTER TABLE and CREATE INDEX
15605 : * statements. Hence, there is no need to pass them through
15606 : * parse_analyze_*() or the rewriter, but instead we need to pass them
15607 : * through parse_utilcmd.c to make them ready for execution.
15608 : */
15609 834 : raw_parsetree_list = raw_parser(cmd, RAW_PARSE_DEFAULT);
15610 834 : querytree_list = NIL;
15611 1668 : foreach(list_item, raw_parsetree_list)
15612 : {
15613 834 : RawStmt *rs = lfirst_node(RawStmt, list_item);
15614 834 : Node *stmt = rs->stmt;
15615 :
15616 834 : if (IsA(stmt, IndexStmt))
15617 228 : querytree_list = lappend(querytree_list,
15618 228 : transformIndexStmt(oldRelId,
15619 : (IndexStmt *) stmt,
15620 : cmd));
15621 606 : else if (IsA(stmt, AlterTableStmt))
15622 : {
15623 : List *beforeStmts;
15624 : List *afterStmts;
15625 :
15626 566 : stmt = (Node *) transformAlterTableStmt(oldRelId,
15627 : (AlterTableStmt *) stmt,
15628 : cmd,
15629 : &beforeStmts,
15630 : &afterStmts);
15631 566 : querytree_list = list_concat(querytree_list, beforeStmts);
15632 566 : querytree_list = lappend(querytree_list, stmt);
15633 566 : querytree_list = list_concat(querytree_list, afterStmts);
15634 : }
15635 40 : else if (IsA(stmt, CreateStatsStmt))
15636 26 : querytree_list = lappend(querytree_list,
15637 26 : transformStatsStmt(oldRelId,
15638 : (CreateStatsStmt *) stmt,
15639 : cmd));
15640 : else
15641 14 : querytree_list = lappend(querytree_list, stmt);
15642 : }
15643 :
15644 : /* Caller should already have acquired whatever lock we need. */
15645 834 : rel = relation_open(oldRelId, NoLock);
15646 :
15647 : /*
15648 : * Attach each generated command to the proper place in the work queue.
15649 : * Note this could result in creation of entirely new work-queue entries.
15650 : *
15651 : * Also note that we have to tweak the command subtypes, because it turns
15652 : * out that re-creation of indexes and constraints has to act a bit
15653 : * differently from initial creation.
15654 : */
15655 1668 : foreach(list_item, querytree_list)
15656 : {
15657 834 : Node *stm = (Node *) lfirst(list_item);
15658 : AlteredTableInfo *tab;
15659 :
15660 834 : tab = ATGetQueueEntry(wqueue, rel);
15661 :
15662 834 : if (IsA(stm, IndexStmt))
15663 : {
15664 228 : IndexStmt *stmt = (IndexStmt *) stm;
15665 : AlterTableCmd *newcmd;
15666 :
15667 228 : if (!rewrite)
15668 56 : TryReuseIndex(oldId, stmt);
15669 228 : stmt->reset_default_tblspc = true;
15670 : /* keep the index's comment */
15671 228 : stmt->idxcomment = GetComment(oldId, RelationRelationId, 0);
15672 :
15673 228 : newcmd = makeNode(AlterTableCmd);
15674 228 : newcmd->subtype = AT_ReAddIndex;
15675 228 : newcmd->def = (Node *) stmt;
15676 228 : tab->subcmds[AT_PASS_OLD_INDEX] =
15677 228 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], newcmd);
15678 : }
15679 606 : else if (IsA(stm, AlterTableStmt))
15680 : {
15681 566 : AlterTableStmt *stmt = (AlterTableStmt *) stm;
15682 : ListCell *lcmd;
15683 :
15684 1132 : foreach(lcmd, stmt->cmds)
15685 : {
15686 566 : AlterTableCmd *cmd = lfirst_node(AlterTableCmd, lcmd);
15687 :
15688 566 : if (cmd->subtype == AT_AddIndex)
15689 : {
15690 : IndexStmt *indstmt;
15691 : Oid indoid;
15692 :
15693 228 : indstmt = castNode(IndexStmt, cmd->def);
15694 228 : indoid = get_constraint_index(oldId);
15695 :
15696 228 : if (!rewrite)
15697 48 : TryReuseIndex(indoid, indstmt);
15698 : /* keep any comment on the index */
15699 228 : indstmt->idxcomment = GetComment(indoid,
15700 : RelationRelationId, 0);
15701 228 : indstmt->reset_default_tblspc = true;
15702 :
15703 228 : cmd->subtype = AT_ReAddIndex;
15704 228 : tab->subcmds[AT_PASS_OLD_INDEX] =
15705 228 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], cmd);
15706 :
15707 : /* recreate any comment on the constraint */
15708 228 : RebuildConstraintComment(tab,
15709 : AT_PASS_OLD_INDEX,
15710 : oldId,
15711 : rel,
15712 : NIL,
15713 228 : indstmt->idxname);
15714 : }
15715 338 : else if (cmd->subtype == AT_AddConstraint)
15716 : {
15717 338 : Constraint *con = castNode(Constraint, cmd->def);
15718 :
15719 338 : con->old_pktable_oid = refRelId;
15720 : /* rewriting neither side of a FK */
15721 338 : if (con->contype == CONSTR_FOREIGN &&
15722 72 : !rewrite && tab->rewrite == 0)
15723 6 : TryReuseForeignKey(oldId, con);
15724 338 : con->reset_default_tblspc = true;
15725 338 : cmd->subtype = AT_ReAddConstraint;
15726 338 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15727 338 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15728 :
15729 : /*
15730 : * Recreate any comment on the constraint. If we have
15731 : * recreated a primary key, then transformTableConstraint
15732 : * has added an unnamed not-null constraint here; skip
15733 : * this in that case.
15734 : */
15735 338 : if (con->conname)
15736 338 : RebuildConstraintComment(tab,
15737 : AT_PASS_OLD_CONSTR,
15738 : oldId,
15739 : rel,
15740 : NIL,
15741 338 : con->conname);
15742 : else
15743 : Assert(con->contype == CONSTR_NOTNULL);
15744 : }
15745 : else
15746 0 : elog(ERROR, "unexpected statement subtype: %d",
15747 : (int) cmd->subtype);
15748 : }
15749 : }
15750 40 : else if (IsA(stm, AlterDomainStmt))
15751 : {
15752 14 : AlterDomainStmt *stmt = (AlterDomainStmt *) stm;
15753 :
15754 14 : if (stmt->subtype == AD_AddConstraint)
15755 : {
15756 14 : Constraint *con = castNode(Constraint, stmt->def);
15757 14 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15758 :
15759 14 : cmd->subtype = AT_ReAddDomainConstraint;
15760 14 : cmd->def = (Node *) stmt;
15761 14 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15762 14 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15763 :
15764 : /* recreate any comment on the constraint */
15765 14 : RebuildConstraintComment(tab,
15766 : AT_PASS_OLD_CONSTR,
15767 : oldId,
15768 : NULL,
15769 : stmt->typeName,
15770 14 : con->conname);
15771 : }
15772 : else
15773 0 : elog(ERROR, "unexpected statement subtype: %d",
15774 : (int) stmt->subtype);
15775 : }
15776 26 : else if (IsA(stm, CreateStatsStmt))
15777 : {
15778 26 : CreateStatsStmt *stmt = (CreateStatsStmt *) stm;
15779 : AlterTableCmd *newcmd;
15780 :
15781 : /* keep the statistics object's comment */
15782 26 : stmt->stxcomment = GetComment(oldId, StatisticExtRelationId, 0);
15783 :
15784 26 : newcmd = makeNode(AlterTableCmd);
15785 26 : newcmd->subtype = AT_ReAddStatistics;
15786 26 : newcmd->def = (Node *) stmt;
15787 26 : tab->subcmds[AT_PASS_MISC] =
15788 26 : lappend(tab->subcmds[AT_PASS_MISC], newcmd);
15789 : }
15790 : else
15791 0 : elog(ERROR, "unexpected statement type: %d",
15792 : (int) nodeTag(stm));
15793 : }
15794 :
15795 834 : relation_close(rel, NoLock);
15796 834 : }
15797 :
15798 : /*
15799 : * Subroutine for ATPostAlterTypeParse() to recreate any existing comment
15800 : * for a table or domain constraint that is being rebuilt.
15801 : *
15802 : * objid is the OID of the constraint.
15803 : * Pass "rel" for a table constraint, or "domname" (domain's qualified name
15804 : * as a string list) for a domain constraint.
15805 : * (We could dig that info, as well as the conname, out of the pg_constraint
15806 : * entry; but callers already have them so might as well pass them.)
15807 : */
15808 : static void
15809 580 : RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass, Oid objid,
15810 : Relation rel, List *domname,
15811 : const char *conname)
15812 : {
15813 : CommentStmt *cmd;
15814 : char *comment_str;
15815 : AlterTableCmd *newcmd;
15816 :
15817 : /* Look for comment for object wanted, and leave if none */
15818 580 : comment_str = GetComment(objid, ConstraintRelationId, 0);
15819 580 : if (comment_str == NULL)
15820 490 : return;
15821 :
15822 : /* Build CommentStmt node, copying all input data for safety */
15823 90 : cmd = makeNode(CommentStmt);
15824 90 : if (rel)
15825 : {
15826 78 : cmd->objtype = OBJECT_TABCONSTRAINT;
15827 78 : cmd->object = (Node *)
15828 78 : list_make3(makeString(get_namespace_name(RelationGetNamespace(rel))),
15829 : makeString(pstrdup(RelationGetRelationName(rel))),
15830 : makeString(pstrdup(conname)));
15831 : }
15832 : else
15833 : {
15834 12 : cmd->objtype = OBJECT_DOMCONSTRAINT;
15835 12 : cmd->object = (Node *)
15836 12 : list_make2(makeTypeNameFromNameList(copyObject(domname)),
15837 : makeString(pstrdup(conname)));
15838 : }
15839 90 : cmd->comment = comment_str;
15840 :
15841 : /* Append it to list of commands */
15842 90 : newcmd = makeNode(AlterTableCmd);
15843 90 : newcmd->subtype = AT_ReAddComment;
15844 90 : newcmd->def = (Node *) cmd;
15845 90 : tab->subcmds[pass] = lappend(tab->subcmds[pass], newcmd);
15846 : }
15847 :
15848 : /*
15849 : * Subroutine for ATPostAlterTypeParse(). Calls out to CheckIndexCompatible()
15850 : * for the real analysis, then mutates the IndexStmt based on that verdict.
15851 : */
15852 : static void
15853 104 : TryReuseIndex(Oid oldId, IndexStmt *stmt)
15854 : {
15855 104 : if (CheckIndexCompatible(oldId,
15856 104 : stmt->accessMethod,
15857 104 : stmt->indexParams,
15858 104 : stmt->excludeOpNames,
15859 104 : stmt->iswithoutoverlaps))
15860 : {
15861 104 : Relation irel = index_open(oldId, NoLock);
15862 :
15863 : /* If it's a partitioned index, there is no storage to share. */
15864 104 : if (irel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
15865 : {
15866 74 : stmt->oldNumber = irel->rd_locator.relNumber;
15867 74 : stmt->oldCreateSubid = irel->rd_createSubid;
15868 74 : stmt->oldFirstRelfilelocatorSubid = irel->rd_firstRelfilelocatorSubid;
15869 : }
15870 104 : index_close(irel, NoLock);
15871 : }
15872 104 : }
15873 :
15874 : /*
15875 : * Subroutine for ATPostAlterTypeParse().
15876 : *
15877 : * Stash the old P-F equality operator into the Constraint node, for possible
15878 : * use by ATAddForeignKeyConstraint() in determining whether revalidation of
15879 : * this constraint can be skipped.
15880 : */
15881 : static void
15882 6 : TryReuseForeignKey(Oid oldId, Constraint *con)
15883 : {
15884 : HeapTuple tup;
15885 : Datum adatum;
15886 : ArrayType *arr;
15887 : Oid *rawarr;
15888 : int numkeys;
15889 : int i;
15890 :
15891 : Assert(con->contype == CONSTR_FOREIGN);
15892 : Assert(con->old_conpfeqop == NIL); /* already prepared this node */
15893 :
15894 6 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15895 6 : if (!HeapTupleIsValid(tup)) /* should not happen */
15896 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15897 :
15898 6 : adatum = SysCacheGetAttrNotNull(CONSTROID, tup,
15899 : Anum_pg_constraint_conpfeqop);
15900 6 : arr = DatumGetArrayTypeP(adatum); /* ensure not toasted */
15901 6 : numkeys = ARR_DIMS(arr)[0];
15902 : /* test follows the one in ri_FetchConstraintInfo() */
15903 6 : if (ARR_NDIM(arr) != 1 ||
15904 6 : ARR_HASNULL(arr) ||
15905 6 : ARR_ELEMTYPE(arr) != OIDOID)
15906 0 : elog(ERROR, "conpfeqop is not a 1-D Oid array");
15907 6 : rawarr = (Oid *) ARR_DATA_PTR(arr);
15908 :
15909 : /* stash a List of the operator Oids in our Constraint node */
15910 12 : for (i = 0; i < numkeys; i++)
15911 6 : con->old_conpfeqop = lappend_oid(con->old_conpfeqop, rawarr[i]);
15912 :
15913 6 : ReleaseSysCache(tup);
15914 6 : }
15915 :
15916 : /*
15917 : * ALTER COLUMN .. OPTIONS ( ... )
15918 : *
15919 : * Returns the address of the modified column
15920 : */
15921 : static ObjectAddress
15922 172 : ATExecAlterColumnGenericOptions(Relation rel,
15923 : const char *colName,
15924 : List *options,
15925 : LOCKMODE lockmode)
15926 : {
15927 : Relation ftrel;
15928 : Relation attrel;
15929 : ForeignServer *server;
15930 : ForeignDataWrapper *fdw;
15931 : HeapTuple tuple;
15932 : HeapTuple newtuple;
15933 : bool isnull;
15934 : Datum repl_val[Natts_pg_attribute];
15935 : bool repl_null[Natts_pg_attribute];
15936 : bool repl_repl[Natts_pg_attribute];
15937 : Datum datum;
15938 : Form_pg_foreign_table fttableform;
15939 : Form_pg_attribute atttableform;
15940 : AttrNumber attnum;
15941 : ObjectAddress address;
15942 :
15943 172 : if (options == NIL)
15944 0 : return InvalidObjectAddress;
15945 :
15946 : /* First, determine FDW validator associated to the foreign table. */
15947 172 : ftrel = table_open(ForeignTableRelationId, AccessShareLock);
15948 172 : tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(rel->rd_id));
15949 172 : if (!HeapTupleIsValid(tuple))
15950 0 : ereport(ERROR,
15951 : (errcode(ERRCODE_UNDEFINED_OBJECT),
15952 : errmsg("foreign table \"%s\" does not exist",
15953 : RelationGetRelationName(rel))));
15954 172 : fttableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
15955 172 : server = GetForeignServer(fttableform->ftserver);
15956 172 : fdw = GetForeignDataWrapper(server->fdwid);
15957 :
15958 172 : table_close(ftrel, AccessShareLock);
15959 172 : ReleaseSysCache(tuple);
15960 :
15961 172 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
15962 172 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
15963 172 : if (!HeapTupleIsValid(tuple))
15964 0 : ereport(ERROR,
15965 : (errcode(ERRCODE_UNDEFINED_COLUMN),
15966 : errmsg("column \"%s\" of relation \"%s\" does not exist",
15967 : colName, RelationGetRelationName(rel))));
15968 :
15969 : /* Prevent them from altering a system attribute */
15970 172 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
15971 172 : attnum = atttableform->attnum;
15972 172 : if (attnum <= 0)
15973 6 : ereport(ERROR,
15974 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15975 : errmsg("cannot alter system column \"%s\"", colName)));
15976 :
15977 :
15978 : /* Initialize buffers for new tuple values */
15979 166 : memset(repl_val, 0, sizeof(repl_val));
15980 166 : memset(repl_null, false, sizeof(repl_null));
15981 166 : memset(repl_repl, false, sizeof(repl_repl));
15982 :
15983 : /* Extract the current options */
15984 166 : datum = SysCacheGetAttr(ATTNAME,
15985 : tuple,
15986 : Anum_pg_attribute_attfdwoptions,
15987 : &isnull);
15988 166 : if (isnull)
15989 156 : datum = PointerGetDatum(NULL);
15990 :
15991 : /* Transform the options */
15992 166 : datum = transformGenericOptions(AttributeRelationId,
15993 : datum,
15994 : options,
15995 : fdw->fdwvalidator);
15996 :
15997 166 : if (DatumGetPointer(datum) != NULL)
15998 166 : repl_val[Anum_pg_attribute_attfdwoptions - 1] = datum;
15999 : else
16000 0 : repl_null[Anum_pg_attribute_attfdwoptions - 1] = true;
16001 :
16002 166 : repl_repl[Anum_pg_attribute_attfdwoptions - 1] = true;
16003 :
16004 : /* Everything looks good - update the tuple */
16005 :
16006 166 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrel),
16007 : repl_val, repl_null, repl_repl);
16008 :
16009 166 : CatalogTupleUpdate(attrel, &newtuple->t_self, newtuple);
16010 :
16011 166 : InvokeObjectPostAlterHook(RelationRelationId,
16012 : RelationGetRelid(rel),
16013 : atttableform->attnum);
16014 166 : ObjectAddressSubSet(address, RelationRelationId,
16015 : RelationGetRelid(rel), attnum);
16016 :
16017 166 : ReleaseSysCache(tuple);
16018 :
16019 166 : table_close(attrel, RowExclusiveLock);
16020 :
16021 166 : heap_freetuple(newtuple);
16022 :
16023 166 : return address;
16024 : }
16025 :
16026 : /*
16027 : * ALTER TABLE OWNER
16028 : *
16029 : * recursing is true if we are recursing from a table to its indexes,
16030 : * sequences, or toast table. We don't allow the ownership of those things to
16031 : * be changed separately from the parent table. Also, we can skip permission
16032 : * checks (this is necessary not just an optimization, else we'd fail to
16033 : * handle toast tables properly).
16034 : *
16035 : * recursing is also true if ALTER TYPE OWNER is calling us to fix up a
16036 : * free-standing composite type.
16037 : */
16038 : void
16039 2226 : ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing, LOCKMODE lockmode)
16040 : {
16041 : Relation target_rel;
16042 : Relation class_rel;
16043 : HeapTuple tuple;
16044 : Form_pg_class tuple_class;
16045 :
16046 : /*
16047 : * Get exclusive lock till end of transaction on the target table. Use
16048 : * relation_open so that we can work on indexes and sequences.
16049 : */
16050 2226 : target_rel = relation_open(relationOid, lockmode);
16051 :
16052 : /* Get its pg_class tuple, too */
16053 2226 : class_rel = table_open(RelationRelationId, RowExclusiveLock);
16054 :
16055 2226 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relationOid));
16056 2226 : if (!HeapTupleIsValid(tuple))
16057 0 : elog(ERROR, "cache lookup failed for relation %u", relationOid);
16058 2226 : tuple_class = (Form_pg_class) GETSTRUCT(tuple);
16059 :
16060 : /* Can we change the ownership of this tuple? */
16061 2226 : switch (tuple_class->relkind)
16062 : {
16063 1942 : case RELKIND_RELATION:
16064 : case RELKIND_VIEW:
16065 : case RELKIND_MATVIEW:
16066 : case RELKIND_FOREIGN_TABLE:
16067 : case RELKIND_PARTITIONED_TABLE:
16068 : /* ok to change owner */
16069 1942 : break;
16070 96 : case RELKIND_INDEX:
16071 96 : if (!recursing)
16072 : {
16073 : /*
16074 : * Because ALTER INDEX OWNER used to be allowed, and in fact
16075 : * is generated by old versions of pg_dump, we give a warning
16076 : * and do nothing rather than erroring out. Also, to avoid
16077 : * unnecessary chatter while restoring those old dumps, say
16078 : * nothing at all if the command would be a no-op anyway.
16079 : */
16080 0 : if (tuple_class->relowner != newOwnerId)
16081 0 : ereport(WARNING,
16082 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16083 : errmsg("cannot change owner of index \"%s\"",
16084 : NameStr(tuple_class->relname)),
16085 : errhint("Change the ownership of the index's table instead.")));
16086 : /* quick hack to exit via the no-op path */
16087 0 : newOwnerId = tuple_class->relowner;
16088 : }
16089 96 : break;
16090 20 : case RELKIND_PARTITIONED_INDEX:
16091 20 : if (recursing)
16092 20 : break;
16093 0 : ereport(ERROR,
16094 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16095 : errmsg("cannot change owner of index \"%s\"",
16096 : NameStr(tuple_class->relname)),
16097 : errhint("Change the ownership of the index's table instead.")));
16098 : break;
16099 118 : case RELKIND_SEQUENCE:
16100 118 : if (!recursing &&
16101 70 : tuple_class->relowner != newOwnerId)
16102 : {
16103 : /* if it's an owned sequence, disallow changing it by itself */
16104 : Oid tableId;
16105 : int32 colId;
16106 :
16107 0 : if (sequenceIsOwned(relationOid, DEPENDENCY_AUTO, &tableId, &colId) ||
16108 0 : sequenceIsOwned(relationOid, DEPENDENCY_INTERNAL, &tableId, &colId))
16109 0 : ereport(ERROR,
16110 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16111 : errmsg("cannot change owner of sequence \"%s\"",
16112 : NameStr(tuple_class->relname)),
16113 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
16114 : NameStr(tuple_class->relname),
16115 : get_rel_name(tableId))));
16116 : }
16117 118 : break;
16118 8 : case RELKIND_COMPOSITE_TYPE:
16119 8 : if (recursing)
16120 8 : break;
16121 0 : ereport(ERROR,
16122 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16123 : errmsg("\"%s\" is a composite type",
16124 : NameStr(tuple_class->relname)),
16125 : /* translator: %s is an SQL ALTER command */
16126 : errhint("Use %s instead.",
16127 : "ALTER TYPE")));
16128 : break;
16129 42 : case RELKIND_TOASTVALUE:
16130 42 : if (recursing)
16131 42 : break;
16132 : /* FALL THRU */
16133 : default:
16134 0 : ereport(ERROR,
16135 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16136 : errmsg("cannot change owner of relation \"%s\"",
16137 : NameStr(tuple_class->relname)),
16138 : errdetail_relkind_not_supported(tuple_class->relkind)));
16139 : }
16140 :
16141 : /*
16142 : * If the new owner is the same as the existing owner, consider the
16143 : * command to have succeeded. This is for dump restoration purposes.
16144 : */
16145 2226 : if (tuple_class->relowner != newOwnerId)
16146 : {
16147 : Datum repl_val[Natts_pg_class];
16148 : bool repl_null[Natts_pg_class];
16149 : bool repl_repl[Natts_pg_class];
16150 : Acl *newAcl;
16151 : Datum aclDatum;
16152 : bool isNull;
16153 : HeapTuple newtuple;
16154 :
16155 : /* skip permission checks when recursing to index or toast table */
16156 498 : if (!recursing)
16157 : {
16158 : /* Superusers can always do it */
16159 280 : if (!superuser())
16160 : {
16161 42 : Oid namespaceOid = tuple_class->relnamespace;
16162 : AclResult aclresult;
16163 :
16164 : /* Otherwise, must be owner of the existing object */
16165 42 : if (!object_ownercheck(RelationRelationId, relationOid, GetUserId()))
16166 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relationOid)),
16167 0 : RelationGetRelationName(target_rel));
16168 :
16169 : /* Must be able to become new owner */
16170 42 : check_can_set_role(GetUserId(), newOwnerId);
16171 :
16172 : /* New owner must have CREATE privilege on namespace */
16173 30 : aclresult = object_aclcheck(NamespaceRelationId, namespaceOid, newOwnerId,
16174 : ACL_CREATE);
16175 30 : if (aclresult != ACLCHECK_OK)
16176 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
16177 0 : get_namespace_name(namespaceOid));
16178 : }
16179 : }
16180 :
16181 486 : memset(repl_null, false, sizeof(repl_null));
16182 486 : memset(repl_repl, false, sizeof(repl_repl));
16183 :
16184 486 : repl_repl[Anum_pg_class_relowner - 1] = true;
16185 486 : repl_val[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(newOwnerId);
16186 :
16187 : /*
16188 : * Determine the modified ACL for the new owner. This is only
16189 : * necessary when the ACL is non-null.
16190 : */
16191 486 : aclDatum = SysCacheGetAttr(RELOID, tuple,
16192 : Anum_pg_class_relacl,
16193 : &isNull);
16194 486 : if (!isNull)
16195 : {
16196 46 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16197 : tuple_class->relowner, newOwnerId);
16198 46 : repl_repl[Anum_pg_class_relacl - 1] = true;
16199 46 : repl_val[Anum_pg_class_relacl - 1] = PointerGetDatum(newAcl);
16200 : }
16201 :
16202 486 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(class_rel), repl_val, repl_null, repl_repl);
16203 :
16204 486 : CatalogTupleUpdate(class_rel, &newtuple->t_self, newtuple);
16205 :
16206 486 : heap_freetuple(newtuple);
16207 :
16208 : /*
16209 : * We must similarly update any per-column ACLs to reflect the new
16210 : * owner; for neatness reasons that's split out as a subroutine.
16211 : */
16212 486 : change_owner_fix_column_acls(relationOid,
16213 : tuple_class->relowner,
16214 : newOwnerId);
16215 :
16216 : /*
16217 : * Update owner dependency reference, if any. A composite type has
16218 : * none, because it's tracked for the pg_type entry instead of here;
16219 : * indexes and TOAST tables don't have their own entries either.
16220 : */
16221 486 : if (tuple_class->relkind != RELKIND_COMPOSITE_TYPE &&
16222 478 : tuple_class->relkind != RELKIND_INDEX &&
16223 382 : tuple_class->relkind != RELKIND_PARTITIONED_INDEX &&
16224 362 : tuple_class->relkind != RELKIND_TOASTVALUE)
16225 320 : changeDependencyOnOwner(RelationRelationId, relationOid,
16226 : newOwnerId);
16227 :
16228 : /*
16229 : * Also change the ownership of the table's row type, if it has one
16230 : */
16231 486 : if (OidIsValid(tuple_class->reltype))
16232 294 : AlterTypeOwnerInternal(tuple_class->reltype, newOwnerId);
16233 :
16234 : /*
16235 : * If we are operating on a table or materialized view, also change
16236 : * the ownership of any indexes and sequences that belong to the
16237 : * relation, as well as its toast table (if it has one).
16238 : */
16239 486 : if (tuple_class->relkind == RELKIND_RELATION ||
16240 262 : tuple_class->relkind == RELKIND_PARTITIONED_TABLE ||
16241 224 : tuple_class->relkind == RELKIND_MATVIEW ||
16242 224 : tuple_class->relkind == RELKIND_TOASTVALUE)
16243 : {
16244 : List *index_oid_list;
16245 : ListCell *i;
16246 :
16247 : /* Find all the indexes belonging to this relation */
16248 304 : index_oid_list = RelationGetIndexList(target_rel);
16249 :
16250 : /* For each index, recursively change its ownership */
16251 420 : foreach(i, index_oid_list)
16252 116 : ATExecChangeOwner(lfirst_oid(i), newOwnerId, true, lockmode);
16253 :
16254 304 : list_free(index_oid_list);
16255 : }
16256 :
16257 : /* If it has a toast table, recurse to change its ownership */
16258 486 : if (tuple_class->reltoastrelid != InvalidOid)
16259 42 : ATExecChangeOwner(tuple_class->reltoastrelid, newOwnerId,
16260 : true, lockmode);
16261 :
16262 : /* If it has dependent sequences, recurse to change them too */
16263 486 : change_owner_recurse_to_sequences(relationOid, newOwnerId, lockmode);
16264 : }
16265 :
16266 2214 : InvokeObjectPostAlterHook(RelationRelationId, relationOid, 0);
16267 :
16268 2214 : ReleaseSysCache(tuple);
16269 2214 : table_close(class_rel, RowExclusiveLock);
16270 2214 : relation_close(target_rel, NoLock);
16271 2214 : }
16272 :
16273 : /*
16274 : * change_owner_fix_column_acls
16275 : *
16276 : * Helper function for ATExecChangeOwner. Scan the columns of the table
16277 : * and fix any non-null column ACLs to reflect the new owner.
16278 : */
16279 : static void
16280 486 : change_owner_fix_column_acls(Oid relationOid, Oid oldOwnerId, Oid newOwnerId)
16281 : {
16282 : Relation attRelation;
16283 : SysScanDesc scan;
16284 : ScanKeyData key[1];
16285 : HeapTuple attributeTuple;
16286 :
16287 486 : attRelation = table_open(AttributeRelationId, RowExclusiveLock);
16288 486 : ScanKeyInit(&key[0],
16289 : Anum_pg_attribute_attrelid,
16290 : BTEqualStrategyNumber, F_OIDEQ,
16291 : ObjectIdGetDatum(relationOid));
16292 486 : scan = systable_beginscan(attRelation, AttributeRelidNumIndexId,
16293 : true, NULL, 1, key);
16294 3372 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
16295 : {
16296 2886 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
16297 : Datum repl_val[Natts_pg_attribute];
16298 : bool repl_null[Natts_pg_attribute];
16299 : bool repl_repl[Natts_pg_attribute];
16300 : Acl *newAcl;
16301 : Datum aclDatum;
16302 : bool isNull;
16303 : HeapTuple newtuple;
16304 :
16305 : /* Ignore dropped columns */
16306 2886 : if (att->attisdropped)
16307 2884 : continue;
16308 :
16309 2886 : aclDatum = heap_getattr(attributeTuple,
16310 : Anum_pg_attribute_attacl,
16311 : RelationGetDescr(attRelation),
16312 : &isNull);
16313 : /* Null ACLs do not require changes */
16314 2886 : if (isNull)
16315 2884 : continue;
16316 :
16317 2 : memset(repl_null, false, sizeof(repl_null));
16318 2 : memset(repl_repl, false, sizeof(repl_repl));
16319 :
16320 2 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16321 : oldOwnerId, newOwnerId);
16322 2 : repl_repl[Anum_pg_attribute_attacl - 1] = true;
16323 2 : repl_val[Anum_pg_attribute_attacl - 1] = PointerGetDatum(newAcl);
16324 :
16325 2 : newtuple = heap_modify_tuple(attributeTuple,
16326 : RelationGetDescr(attRelation),
16327 : repl_val, repl_null, repl_repl);
16328 :
16329 2 : CatalogTupleUpdate(attRelation, &newtuple->t_self, newtuple);
16330 :
16331 2 : heap_freetuple(newtuple);
16332 : }
16333 486 : systable_endscan(scan);
16334 486 : table_close(attRelation, RowExclusiveLock);
16335 486 : }
16336 :
16337 : /*
16338 : * change_owner_recurse_to_sequences
16339 : *
16340 : * Helper function for ATExecChangeOwner. Examines pg_depend searching
16341 : * for sequences that are dependent on serial columns, and changes their
16342 : * ownership.
16343 : */
16344 : static void
16345 486 : change_owner_recurse_to_sequences(Oid relationOid, Oid newOwnerId, LOCKMODE lockmode)
16346 : {
16347 : Relation depRel;
16348 : SysScanDesc scan;
16349 : ScanKeyData key[2];
16350 : HeapTuple tup;
16351 :
16352 : /*
16353 : * SERIAL sequences are those having an auto dependency on one of the
16354 : * table's columns (we don't care *which* column, exactly).
16355 : */
16356 486 : depRel = table_open(DependRelationId, AccessShareLock);
16357 :
16358 486 : ScanKeyInit(&key[0],
16359 : Anum_pg_depend_refclassid,
16360 : BTEqualStrategyNumber, F_OIDEQ,
16361 : ObjectIdGetDatum(RelationRelationId));
16362 486 : ScanKeyInit(&key[1],
16363 : Anum_pg_depend_refobjid,
16364 : BTEqualStrategyNumber, F_OIDEQ,
16365 : ObjectIdGetDatum(relationOid));
16366 : /* we leave refobjsubid unspecified */
16367 :
16368 486 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
16369 : NULL, 2, key);
16370 :
16371 1374 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
16372 : {
16373 888 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
16374 : Relation seqRel;
16375 :
16376 : /* skip dependencies other than auto dependencies on columns */
16377 888 : if (depForm->refobjsubid == 0 ||
16378 352 : depForm->classid != RelationRelationId ||
16379 142 : depForm->objsubid != 0 ||
16380 142 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
16381 746 : continue;
16382 :
16383 : /* Use relation_open just in case it's an index */
16384 142 : seqRel = relation_open(depForm->objid, lockmode);
16385 :
16386 : /* skip non-sequence relations */
16387 142 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
16388 : {
16389 : /* No need to keep the lock */
16390 116 : relation_close(seqRel, lockmode);
16391 116 : continue;
16392 : }
16393 :
16394 : /* We don't need to close the sequence while we alter it. */
16395 26 : ATExecChangeOwner(depForm->objid, newOwnerId, true, lockmode);
16396 :
16397 : /* Now we can close it. Keep the lock till end of transaction. */
16398 26 : relation_close(seqRel, NoLock);
16399 : }
16400 :
16401 486 : systable_endscan(scan);
16402 :
16403 486 : relation_close(depRel, AccessShareLock);
16404 486 : }
16405 :
16406 : /*
16407 : * ALTER TABLE CLUSTER ON
16408 : *
16409 : * The only thing we have to do is to change the indisclustered bits.
16410 : *
16411 : * Return the address of the new clustering index.
16412 : */
16413 : static ObjectAddress
16414 64 : ATExecClusterOn(Relation rel, const char *indexName, LOCKMODE lockmode)
16415 : {
16416 : Oid indexOid;
16417 : ObjectAddress address;
16418 :
16419 64 : indexOid = get_relname_relid(indexName, rel->rd_rel->relnamespace);
16420 :
16421 64 : if (!OidIsValid(indexOid))
16422 0 : ereport(ERROR,
16423 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16424 : errmsg("index \"%s\" for table \"%s\" does not exist",
16425 : indexName, RelationGetRelationName(rel))));
16426 :
16427 : /* Check index is valid to cluster on */
16428 64 : check_index_is_clusterable(rel, indexOid, lockmode);
16429 :
16430 : /* And do the work */
16431 64 : mark_index_clustered(rel, indexOid, false);
16432 :
16433 58 : ObjectAddressSet(address,
16434 : RelationRelationId, indexOid);
16435 :
16436 58 : return address;
16437 : }
16438 :
16439 : /*
16440 : * ALTER TABLE SET WITHOUT CLUSTER
16441 : *
16442 : * We have to find any indexes on the table that have indisclustered bit
16443 : * set and turn it off.
16444 : */
16445 : static void
16446 18 : ATExecDropCluster(Relation rel, LOCKMODE lockmode)
16447 : {
16448 18 : mark_index_clustered(rel, InvalidOid, false);
16449 12 : }
16450 :
16451 : /*
16452 : * Preparation phase for SET ACCESS METHOD
16453 : *
16454 : * Check that the access method exists and determine whether a change is
16455 : * actually needed.
16456 : */
16457 : static void
16458 110 : ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname)
16459 : {
16460 : Oid amoid;
16461 :
16462 : /*
16463 : * Look up the access method name and check that it differs from the
16464 : * table's current AM. If DEFAULT was specified for a partitioned table
16465 : * (amname is NULL), set it to InvalidOid to reset the catalogued AM.
16466 : */
16467 110 : if (amname != NULL)
16468 74 : amoid = get_table_am_oid(amname, false);
16469 36 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
16470 18 : amoid = InvalidOid;
16471 : else
16472 18 : amoid = get_table_am_oid(default_table_access_method, false);
16473 :
16474 : /* if it's a match, phase 3 doesn't need to do anything */
16475 110 : if (rel->rd_rel->relam == amoid)
16476 12 : return;
16477 :
16478 : /* Save info for Phase 3 to do the real work */
16479 98 : tab->rewrite |= AT_REWRITE_ACCESS_METHOD;
16480 98 : tab->newAccessMethod = amoid;
16481 98 : tab->chgAccessMethod = true;
16482 : }
16483 :
16484 : /*
16485 : * Special handling of ALTER TABLE SET ACCESS METHOD for relations with no
16486 : * storage that have an interest in preserving AM.
16487 : *
16488 : * Since these have no storage, setting the access method is a catalog only
16489 : * operation.
16490 : */
16491 : static void
16492 44 : ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId)
16493 : {
16494 : Relation pg_class;
16495 : Oid oldAccessMethodId;
16496 : HeapTuple tuple;
16497 : Form_pg_class rd_rel;
16498 44 : Oid reloid = RelationGetRelid(rel);
16499 :
16500 : /*
16501 : * Shouldn't be called on relations having storage; these are processed in
16502 : * phase 3.
16503 : */
16504 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16505 :
16506 : /* Get a modifiable copy of the relation's pg_class row. */
16507 44 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
16508 :
16509 44 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(reloid));
16510 44 : if (!HeapTupleIsValid(tuple))
16511 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
16512 44 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
16513 :
16514 : /* Update the pg_class row. */
16515 44 : oldAccessMethodId = rd_rel->relam;
16516 44 : rd_rel->relam = newAccessMethodId;
16517 :
16518 : /* Leave if no update required */
16519 44 : if (rd_rel->relam == oldAccessMethodId)
16520 : {
16521 0 : heap_freetuple(tuple);
16522 0 : table_close(pg_class, RowExclusiveLock);
16523 0 : return;
16524 : }
16525 :
16526 44 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
16527 :
16528 : /*
16529 : * Update the dependency on the new access method. No dependency is added
16530 : * if the new access method is InvalidOid (default case). Be very careful
16531 : * that this has to compare the previous value stored in pg_class with the
16532 : * new one.
16533 : */
16534 44 : if (!OidIsValid(oldAccessMethodId) && OidIsValid(rd_rel->relam))
16535 20 : {
16536 : ObjectAddress relobj,
16537 : referenced;
16538 :
16539 : /*
16540 : * New access method is defined and there was no dependency
16541 : * previously, so record a new one.
16542 : */
16543 20 : ObjectAddressSet(relobj, RelationRelationId, reloid);
16544 20 : ObjectAddressSet(referenced, AccessMethodRelationId, rd_rel->relam);
16545 20 : recordDependencyOn(&relobj, &referenced, DEPENDENCY_NORMAL);
16546 : }
16547 24 : else if (OidIsValid(oldAccessMethodId) &&
16548 24 : !OidIsValid(rd_rel->relam))
16549 : {
16550 : /*
16551 : * There was an access method defined, and no new one, so just remove
16552 : * the existing dependency.
16553 : */
16554 12 : deleteDependencyRecordsForClass(RelationRelationId, reloid,
16555 : AccessMethodRelationId,
16556 : DEPENDENCY_NORMAL);
16557 : }
16558 : else
16559 : {
16560 : Assert(OidIsValid(oldAccessMethodId) &&
16561 : OidIsValid(rd_rel->relam));
16562 :
16563 : /* Both are valid, so update the dependency */
16564 12 : changeDependencyFor(RelationRelationId, reloid,
16565 : AccessMethodRelationId,
16566 : oldAccessMethodId, rd_rel->relam);
16567 : }
16568 :
16569 : /* make the relam and dependency changes visible */
16570 44 : CommandCounterIncrement();
16571 :
16572 44 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16573 :
16574 44 : heap_freetuple(tuple);
16575 44 : table_close(pg_class, RowExclusiveLock);
16576 : }
16577 :
16578 : /*
16579 : * ALTER TABLE SET TABLESPACE
16580 : */
16581 : static void
16582 158 : ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel, const char *tablespacename, LOCKMODE lockmode)
16583 : {
16584 : Oid tablespaceId;
16585 :
16586 : /* Check that the tablespace exists */
16587 158 : tablespaceId = get_tablespace_oid(tablespacename, false);
16588 :
16589 : /* Check permissions except when moving to database's default */
16590 158 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
16591 : {
16592 : AclResult aclresult;
16593 :
16594 66 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(), ACL_CREATE);
16595 66 : if (aclresult != ACLCHECK_OK)
16596 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE, tablespacename);
16597 : }
16598 :
16599 : /* Save info for Phase 3 to do the real work */
16600 158 : if (OidIsValid(tab->newTableSpace))
16601 0 : ereport(ERROR,
16602 : (errcode(ERRCODE_SYNTAX_ERROR),
16603 : errmsg("cannot have multiple SET TABLESPACE subcommands")));
16604 :
16605 158 : tab->newTableSpace = tablespaceId;
16606 158 : }
16607 :
16608 : /*
16609 : * Set, reset, or replace reloptions.
16610 : */
16611 : static void
16612 960 : ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
16613 : LOCKMODE lockmode)
16614 : {
16615 : Oid relid;
16616 : Relation pgclass;
16617 : HeapTuple tuple;
16618 : HeapTuple newtuple;
16619 : Datum datum;
16620 : Datum newOptions;
16621 : Datum repl_val[Natts_pg_class];
16622 : bool repl_null[Natts_pg_class];
16623 : bool repl_repl[Natts_pg_class];
16624 960 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
16625 :
16626 960 : if (defList == NIL && operation != AT_ReplaceRelOptions)
16627 0 : return; /* nothing to do */
16628 :
16629 960 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
16630 :
16631 : /* Fetch heap tuple */
16632 960 : relid = RelationGetRelid(rel);
16633 960 : tuple = SearchSysCacheLocked1(RELOID, ObjectIdGetDatum(relid));
16634 960 : if (!HeapTupleIsValid(tuple))
16635 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
16636 :
16637 960 : if (operation == AT_ReplaceRelOptions)
16638 : {
16639 : /*
16640 : * If we're supposed to replace the reloptions list, we just pretend
16641 : * there were none before.
16642 : */
16643 194 : datum = (Datum) 0;
16644 : }
16645 : else
16646 : {
16647 : bool isnull;
16648 :
16649 : /* Get the old reloptions */
16650 766 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16651 : &isnull);
16652 766 : if (isnull)
16653 478 : datum = (Datum) 0;
16654 : }
16655 :
16656 : /* Generate new proposed reloptions (text array) */
16657 960 : newOptions = transformRelOptions(datum, defList, NULL, validnsps, false,
16658 : operation == AT_ResetRelOptions);
16659 :
16660 : /* Validate */
16661 954 : switch (rel->rd_rel->relkind)
16662 : {
16663 536 : case RELKIND_RELATION:
16664 : case RELKIND_MATVIEW:
16665 536 : (void) heap_reloptions(rel->rd_rel->relkind, newOptions, true);
16666 536 : break;
16667 6 : case RELKIND_PARTITIONED_TABLE:
16668 6 : (void) partitioned_table_reloptions(newOptions, true);
16669 0 : break;
16670 296 : case RELKIND_VIEW:
16671 296 : (void) view_reloptions(newOptions, true);
16672 278 : break;
16673 116 : case RELKIND_INDEX:
16674 : case RELKIND_PARTITIONED_INDEX:
16675 116 : (void) index_reloptions(rel->rd_indam->amoptions, newOptions, true);
16676 94 : break;
16677 0 : case RELKIND_TOASTVALUE:
16678 : /* fall through to error -- shouldn't ever get here */
16679 : default:
16680 0 : ereport(ERROR,
16681 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16682 : errmsg("cannot set options for relation \"%s\"",
16683 : RelationGetRelationName(rel)),
16684 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
16685 : break;
16686 : }
16687 :
16688 : /* Special-case validation of view options */
16689 908 : if (rel->rd_rel->relkind == RELKIND_VIEW)
16690 : {
16691 278 : Query *view_query = get_view_query(rel);
16692 278 : List *view_options = untransformRelOptions(newOptions);
16693 : ListCell *cell;
16694 278 : bool check_option = false;
16695 :
16696 380 : foreach(cell, view_options)
16697 : {
16698 102 : DefElem *defel = (DefElem *) lfirst(cell);
16699 :
16700 102 : if (strcmp(defel->defname, "check_option") == 0)
16701 24 : check_option = true;
16702 : }
16703 :
16704 : /*
16705 : * If the check option is specified, look to see if the view is
16706 : * actually auto-updatable or not.
16707 : */
16708 278 : if (check_option)
16709 : {
16710 : const char *view_updatable_error =
16711 24 : view_query_is_auto_updatable(view_query, true);
16712 :
16713 24 : if (view_updatable_error)
16714 0 : ereport(ERROR,
16715 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16716 : errmsg("WITH CHECK OPTION is supported only on automatically updatable views"),
16717 : errhint("%s", _(view_updatable_error))));
16718 : }
16719 : }
16720 :
16721 : /*
16722 : * All we need do here is update the pg_class row; the new options will be
16723 : * propagated into relcaches during post-commit cache inval.
16724 : */
16725 908 : memset(repl_val, 0, sizeof(repl_val));
16726 908 : memset(repl_null, false, sizeof(repl_null));
16727 908 : memset(repl_repl, false, sizeof(repl_repl));
16728 :
16729 908 : if (newOptions != (Datum) 0)
16730 614 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
16731 : else
16732 294 : repl_null[Anum_pg_class_reloptions - 1] = true;
16733 :
16734 908 : repl_repl[Anum_pg_class_reloptions - 1] = true;
16735 :
16736 908 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
16737 : repl_val, repl_null, repl_repl);
16738 :
16739 908 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
16740 908 : UnlockTuple(pgclass, &tuple->t_self, InplaceUpdateTupleLock);
16741 :
16742 908 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16743 :
16744 908 : heap_freetuple(newtuple);
16745 :
16746 908 : ReleaseSysCache(tuple);
16747 :
16748 : /* repeat the whole exercise for the toast table, if there's one */
16749 908 : if (OidIsValid(rel->rd_rel->reltoastrelid))
16750 : {
16751 : Relation toastrel;
16752 268 : Oid toastid = rel->rd_rel->reltoastrelid;
16753 :
16754 268 : toastrel = table_open(toastid, lockmode);
16755 :
16756 : /* Fetch heap tuple */
16757 268 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(toastid));
16758 268 : if (!HeapTupleIsValid(tuple))
16759 0 : elog(ERROR, "cache lookup failed for relation %u", toastid);
16760 :
16761 268 : if (operation == AT_ReplaceRelOptions)
16762 : {
16763 : /*
16764 : * If we're supposed to replace the reloptions list, we just
16765 : * pretend there were none before.
16766 : */
16767 0 : datum = (Datum) 0;
16768 : }
16769 : else
16770 : {
16771 : bool isnull;
16772 :
16773 : /* Get the old reloptions */
16774 268 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16775 : &isnull);
16776 268 : if (isnull)
16777 232 : datum = (Datum) 0;
16778 : }
16779 :
16780 268 : newOptions = transformRelOptions(datum, defList, "toast", validnsps,
16781 : false, operation == AT_ResetRelOptions);
16782 :
16783 268 : (void) heap_reloptions(RELKIND_TOASTVALUE, newOptions, true);
16784 :
16785 268 : memset(repl_val, 0, sizeof(repl_val));
16786 268 : memset(repl_null, false, sizeof(repl_null));
16787 268 : memset(repl_repl, false, sizeof(repl_repl));
16788 :
16789 268 : if (newOptions != (Datum) 0)
16790 42 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
16791 : else
16792 226 : repl_null[Anum_pg_class_reloptions - 1] = true;
16793 :
16794 268 : repl_repl[Anum_pg_class_reloptions - 1] = true;
16795 :
16796 268 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
16797 : repl_val, repl_null, repl_repl);
16798 :
16799 268 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
16800 :
16801 268 : InvokeObjectPostAlterHookArg(RelationRelationId,
16802 : RelationGetRelid(toastrel), 0,
16803 : InvalidOid, true);
16804 :
16805 268 : heap_freetuple(newtuple);
16806 :
16807 268 : ReleaseSysCache(tuple);
16808 :
16809 268 : table_close(toastrel, NoLock);
16810 : }
16811 :
16812 908 : table_close(pgclass, RowExclusiveLock);
16813 : }
16814 :
16815 : /*
16816 : * Execute ALTER TABLE SET TABLESPACE for cases where there is no tuple
16817 : * rewriting to be done, so we just want to copy the data as fast as possible.
16818 : */
16819 : static void
16820 162 : ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode)
16821 : {
16822 : Relation rel;
16823 : Oid reltoastrelid;
16824 : RelFileNumber newrelfilenumber;
16825 : RelFileLocator newrlocator;
16826 162 : List *reltoastidxids = NIL;
16827 : ListCell *lc;
16828 :
16829 : /*
16830 : * Need lock here in case we are recursing to toast table or index
16831 : */
16832 162 : rel = relation_open(tableOid, lockmode);
16833 :
16834 : /* Check first if relation can be moved to new tablespace */
16835 162 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
16836 : {
16837 2 : InvokeObjectPostAlterHook(RelationRelationId,
16838 : RelationGetRelid(rel), 0);
16839 2 : relation_close(rel, NoLock);
16840 2 : return;
16841 : }
16842 :
16843 160 : reltoastrelid = rel->rd_rel->reltoastrelid;
16844 : /* Fetch the list of indexes on toast relation if necessary */
16845 160 : if (OidIsValid(reltoastrelid))
16846 : {
16847 20 : Relation toastRel = relation_open(reltoastrelid, lockmode);
16848 :
16849 20 : reltoastidxids = RelationGetIndexList(toastRel);
16850 20 : relation_close(toastRel, lockmode);
16851 : }
16852 :
16853 : /*
16854 : * Relfilenumbers are not unique in databases across tablespaces, so we
16855 : * need to allocate a new one in the new tablespace.
16856 : */
16857 160 : newrelfilenumber = GetNewRelFileNumber(newTableSpace, NULL,
16858 160 : rel->rd_rel->relpersistence);
16859 :
16860 : /* Open old and new relation */
16861 160 : newrlocator = rel->rd_locator;
16862 160 : newrlocator.relNumber = newrelfilenumber;
16863 160 : newrlocator.spcOid = newTableSpace;
16864 :
16865 : /* hand off to AM to actually create new rel storage and copy the data */
16866 160 : if (rel->rd_rel->relkind == RELKIND_INDEX)
16867 : {
16868 62 : index_copy_data(rel, newrlocator);
16869 : }
16870 : else
16871 : {
16872 : Assert(RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind));
16873 98 : table_relation_copy_data(rel, &newrlocator);
16874 : }
16875 :
16876 : /*
16877 : * Update the pg_class row.
16878 : *
16879 : * NB: This wouldn't work if ATExecSetTableSpace() were allowed to be
16880 : * executed on pg_class or its indexes (the above copy wouldn't contain
16881 : * the updated pg_class entry), but that's forbidden with
16882 : * CheckRelationTableSpaceMove().
16883 : */
16884 160 : SetRelationTableSpace(rel, newTableSpace, newrelfilenumber);
16885 :
16886 160 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16887 :
16888 160 : RelationAssumeNewRelfilelocator(rel);
16889 :
16890 160 : relation_close(rel, NoLock);
16891 :
16892 : /* Make sure the reltablespace change is visible */
16893 160 : CommandCounterIncrement();
16894 :
16895 : /* Move associated toast relation and/or indexes, too */
16896 160 : if (OidIsValid(reltoastrelid))
16897 20 : ATExecSetTableSpace(reltoastrelid, newTableSpace, lockmode);
16898 180 : foreach(lc, reltoastidxids)
16899 20 : ATExecSetTableSpace(lfirst_oid(lc), newTableSpace, lockmode);
16900 :
16901 : /* Clean up */
16902 160 : list_free(reltoastidxids);
16903 : }
16904 :
16905 : /*
16906 : * Special handling of ALTER TABLE SET TABLESPACE for relations with no
16907 : * storage that have an interest in preserving tablespace.
16908 : *
16909 : * Since these have no storage the tablespace can be updated with a simple
16910 : * metadata only operation to update the tablespace.
16911 : */
16912 : static void
16913 36 : ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace)
16914 : {
16915 : /*
16916 : * Shouldn't be called on relations having storage; these are processed in
16917 : * phase 3.
16918 : */
16919 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16920 :
16921 : /* check if relation can be moved to its new tablespace */
16922 36 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
16923 : {
16924 0 : InvokeObjectPostAlterHook(RelationRelationId,
16925 : RelationGetRelid(rel),
16926 : 0);
16927 0 : return;
16928 : }
16929 :
16930 : /* Update can be done, so change reltablespace */
16931 30 : SetRelationTableSpace(rel, newTableSpace, InvalidOid);
16932 :
16933 30 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16934 :
16935 : /* Make sure the reltablespace change is visible */
16936 30 : CommandCounterIncrement();
16937 : }
16938 :
16939 : /*
16940 : * Alter Table ALL ... SET TABLESPACE
16941 : *
16942 : * Allows a user to move all objects of some type in a given tablespace in the
16943 : * current database to another tablespace. Objects can be chosen based on the
16944 : * owner of the object also, to allow users to move only their objects.
16945 : * The user must have CREATE rights on the new tablespace, as usual. The main
16946 : * permissions handling is done by the lower-level table move function.
16947 : *
16948 : * All to-be-moved objects are locked first. If NOWAIT is specified and the
16949 : * lock can't be acquired then we ereport(ERROR).
16950 : */
16951 : Oid
16952 30 : AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
16953 : {
16954 30 : List *relations = NIL;
16955 : ListCell *l;
16956 : ScanKeyData key[1];
16957 : Relation rel;
16958 : TableScanDesc scan;
16959 : HeapTuple tuple;
16960 : Oid orig_tablespaceoid;
16961 : Oid new_tablespaceoid;
16962 30 : List *role_oids = roleSpecsToIds(stmt->roles);
16963 :
16964 : /* Ensure we were not asked to move something we can't */
16965 30 : if (stmt->objtype != OBJECT_TABLE && stmt->objtype != OBJECT_INDEX &&
16966 12 : stmt->objtype != OBJECT_MATVIEW)
16967 0 : ereport(ERROR,
16968 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
16969 : errmsg("only tables, indexes, and materialized views exist in tablespaces")));
16970 :
16971 : /* Get the orig and new tablespace OIDs */
16972 30 : orig_tablespaceoid = get_tablespace_oid(stmt->orig_tablespacename, false);
16973 30 : new_tablespaceoid = get_tablespace_oid(stmt->new_tablespacename, false);
16974 :
16975 : /* Can't move shared relations in to or out of pg_global */
16976 : /* This is also checked by ATExecSetTableSpace, but nice to stop earlier */
16977 30 : if (orig_tablespaceoid == GLOBALTABLESPACE_OID ||
16978 : new_tablespaceoid == GLOBALTABLESPACE_OID)
16979 0 : ereport(ERROR,
16980 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
16981 : errmsg("cannot move relations in to or out of pg_global tablespace")));
16982 :
16983 : /*
16984 : * Must have CREATE rights on the new tablespace, unless it is the
16985 : * database default tablespace (which all users implicitly have CREATE
16986 : * rights on).
16987 : */
16988 30 : if (OidIsValid(new_tablespaceoid) && new_tablespaceoid != MyDatabaseTableSpace)
16989 : {
16990 : AclResult aclresult;
16991 :
16992 0 : aclresult = object_aclcheck(TableSpaceRelationId, new_tablespaceoid, GetUserId(),
16993 : ACL_CREATE);
16994 0 : if (aclresult != ACLCHECK_OK)
16995 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
16996 0 : get_tablespace_name(new_tablespaceoid));
16997 : }
16998 :
16999 : /*
17000 : * Now that the checks are done, check if we should set either to
17001 : * InvalidOid because it is our database's default tablespace.
17002 : */
17003 30 : if (orig_tablespaceoid == MyDatabaseTableSpace)
17004 0 : orig_tablespaceoid = InvalidOid;
17005 :
17006 30 : if (new_tablespaceoid == MyDatabaseTableSpace)
17007 30 : new_tablespaceoid = InvalidOid;
17008 :
17009 : /* no-op */
17010 30 : if (orig_tablespaceoid == new_tablespaceoid)
17011 0 : return new_tablespaceoid;
17012 :
17013 : /*
17014 : * Walk the list of objects in the tablespace and move them. This will
17015 : * only find objects in our database, of course.
17016 : */
17017 30 : ScanKeyInit(&key[0],
17018 : Anum_pg_class_reltablespace,
17019 : BTEqualStrategyNumber, F_OIDEQ,
17020 : ObjectIdGetDatum(orig_tablespaceoid));
17021 :
17022 30 : rel = table_open(RelationRelationId, AccessShareLock);
17023 30 : scan = table_beginscan_catalog(rel, 1, key);
17024 132 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
17025 : {
17026 102 : Form_pg_class relForm = (Form_pg_class) GETSTRUCT(tuple);
17027 102 : Oid relOid = relForm->oid;
17028 :
17029 : /*
17030 : * Do not move objects in pg_catalog as part of this, if an admin
17031 : * really wishes to do so, they can issue the individual ALTER
17032 : * commands directly.
17033 : *
17034 : * Also, explicitly avoid any shared tables, temp tables, or TOAST
17035 : * (TOAST will be moved with the main table).
17036 : */
17037 102 : if (IsCatalogNamespace(relForm->relnamespace) ||
17038 204 : relForm->relisshared ||
17039 204 : isAnyTempNamespace(relForm->relnamespace) ||
17040 102 : IsToastNamespace(relForm->relnamespace))
17041 0 : continue;
17042 :
17043 : /* Only move the object type requested */
17044 102 : if ((stmt->objtype == OBJECT_TABLE &&
17045 60 : relForm->relkind != RELKIND_RELATION &&
17046 36 : relForm->relkind != RELKIND_PARTITIONED_TABLE) ||
17047 66 : (stmt->objtype == OBJECT_INDEX &&
17048 36 : relForm->relkind != RELKIND_INDEX &&
17049 6 : relForm->relkind != RELKIND_PARTITIONED_INDEX) ||
17050 60 : (stmt->objtype == OBJECT_MATVIEW &&
17051 6 : relForm->relkind != RELKIND_MATVIEW))
17052 42 : continue;
17053 :
17054 : /* Check if we are only moving objects owned by certain roles */
17055 60 : if (role_oids != NIL && !list_member_oid(role_oids, relForm->relowner))
17056 0 : continue;
17057 :
17058 : /*
17059 : * Handle permissions-checking here since we are locking the tables
17060 : * and also to avoid doing a bunch of work only to fail part-way. Note
17061 : * that permissions will also be checked by AlterTableInternal().
17062 : *
17063 : * Caller must be considered an owner on the table to move it.
17064 : */
17065 60 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()))
17066 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relOid)),
17067 0 : NameStr(relForm->relname));
17068 :
17069 60 : if (stmt->nowait &&
17070 0 : !ConditionalLockRelationOid(relOid, AccessExclusiveLock))
17071 0 : ereport(ERROR,
17072 : (errcode(ERRCODE_OBJECT_IN_USE),
17073 : errmsg("aborting because lock on relation \"%s.%s\" is not available",
17074 : get_namespace_name(relForm->relnamespace),
17075 : NameStr(relForm->relname))));
17076 : else
17077 60 : LockRelationOid(relOid, AccessExclusiveLock);
17078 :
17079 : /* Add to our list of objects to move */
17080 60 : relations = lappend_oid(relations, relOid);
17081 : }
17082 :
17083 30 : table_endscan(scan);
17084 30 : table_close(rel, AccessShareLock);
17085 :
17086 30 : if (relations == NIL)
17087 12 : ereport(NOTICE,
17088 : (errcode(ERRCODE_NO_DATA_FOUND),
17089 : errmsg("no matching relations in tablespace \"%s\" found",
17090 : orig_tablespaceoid == InvalidOid ? "(database default)" :
17091 : get_tablespace_name(orig_tablespaceoid))));
17092 :
17093 : /* Everything is locked, loop through and move all of the relations. */
17094 90 : foreach(l, relations)
17095 : {
17096 60 : List *cmds = NIL;
17097 60 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
17098 :
17099 60 : cmd->subtype = AT_SetTableSpace;
17100 60 : cmd->name = stmt->new_tablespacename;
17101 :
17102 60 : cmds = lappend(cmds, cmd);
17103 :
17104 60 : EventTriggerAlterTableStart((Node *) stmt);
17105 : /* OID is set by AlterTableInternal */
17106 60 : AlterTableInternal(lfirst_oid(l), cmds, false);
17107 60 : EventTriggerAlterTableEnd();
17108 : }
17109 :
17110 30 : return new_tablespaceoid;
17111 : }
17112 :
17113 : static void
17114 62 : index_copy_data(Relation rel, RelFileLocator newrlocator)
17115 : {
17116 : SMgrRelation dstrel;
17117 :
17118 : /*
17119 : * Since we copy the file directly without looking at the shared buffers,
17120 : * we'd better first flush out any pages of the source relation that are
17121 : * in shared buffers. We assume no new changes will be made while we are
17122 : * holding exclusive lock on the rel.
17123 : */
17124 62 : FlushRelationBuffers(rel);
17125 :
17126 : /*
17127 : * Create and copy all forks of the relation, and schedule unlinking of
17128 : * old physical files.
17129 : *
17130 : * NOTE: any conflict in relfilenumber value will be caught in
17131 : * RelationCreateStorage().
17132 : */
17133 62 : dstrel = RelationCreateStorage(newrlocator, rel->rd_rel->relpersistence, true);
17134 :
17135 : /* copy main fork */
17136 62 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
17137 62 : rel->rd_rel->relpersistence);
17138 :
17139 : /* copy those extra forks that exist */
17140 62 : for (ForkNumber forkNum = MAIN_FORKNUM + 1;
17141 248 : forkNum <= MAX_FORKNUM; forkNum++)
17142 : {
17143 186 : if (smgrexists(RelationGetSmgr(rel), forkNum))
17144 : {
17145 0 : smgrcreate(dstrel, forkNum, false);
17146 :
17147 : /*
17148 : * WAL log creation if the relation is persistent, or this is the
17149 : * init fork of an unlogged relation.
17150 : */
17151 0 : if (RelationIsPermanent(rel) ||
17152 0 : (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
17153 : forkNum == INIT_FORKNUM))
17154 0 : log_smgrcreate(&newrlocator, forkNum);
17155 0 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, forkNum,
17156 0 : rel->rd_rel->relpersistence);
17157 : }
17158 : }
17159 :
17160 : /* drop old relation, and close new one */
17161 62 : RelationDropStorage(rel);
17162 62 : smgrclose(dstrel);
17163 62 : }
17164 :
17165 : /*
17166 : * ALTER TABLE ENABLE/DISABLE TRIGGER
17167 : *
17168 : * We just pass this off to trigger.c.
17169 : */
17170 : static void
17171 342 : ATExecEnableDisableTrigger(Relation rel, const char *trigname,
17172 : char fires_when, bool skip_system, bool recurse,
17173 : LOCKMODE lockmode)
17174 : {
17175 342 : EnableDisableTrigger(rel, trigname, InvalidOid,
17176 : fires_when, skip_system, recurse,
17177 : lockmode);
17178 :
17179 342 : InvokeObjectPostAlterHook(RelationRelationId,
17180 : RelationGetRelid(rel), 0);
17181 342 : }
17182 :
17183 : /*
17184 : * ALTER TABLE ENABLE/DISABLE RULE
17185 : *
17186 : * We just pass this off to rewriteDefine.c.
17187 : */
17188 : static void
17189 46 : ATExecEnableDisableRule(Relation rel, const char *rulename,
17190 : char fires_when, LOCKMODE lockmode)
17191 : {
17192 46 : EnableDisableRule(rel, rulename, fires_when);
17193 :
17194 46 : InvokeObjectPostAlterHook(RelationRelationId,
17195 : RelationGetRelid(rel), 0);
17196 46 : }
17197 :
17198 : /*
17199 : * ALTER TABLE INHERIT
17200 : *
17201 : * Add a parent to the child's parents. This verifies that all the columns and
17202 : * check constraints of the parent appear in the child and that they have the
17203 : * same data types and expressions.
17204 : */
17205 : static void
17206 464 : ATPrepAddInherit(Relation child_rel)
17207 : {
17208 464 : if (child_rel->rd_rel->reloftype)
17209 6 : ereport(ERROR,
17210 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17211 : errmsg("cannot change inheritance of typed table")));
17212 :
17213 458 : if (child_rel->rd_rel->relispartition)
17214 6 : ereport(ERROR,
17215 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17216 : errmsg("cannot change inheritance of a partition")));
17217 :
17218 452 : if (child_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17219 6 : ereport(ERROR,
17220 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17221 : errmsg("cannot change inheritance of partitioned table")));
17222 446 : }
17223 :
17224 : /*
17225 : * Return the address of the new parent relation.
17226 : */
17227 : static ObjectAddress
17228 446 : ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode)
17229 : {
17230 : Relation parent_rel;
17231 : List *children;
17232 : ObjectAddress address;
17233 : const char *trigger_name;
17234 :
17235 : /*
17236 : * A self-exclusive lock is needed here. See the similar case in
17237 : * MergeAttributes() for a full explanation.
17238 : */
17239 446 : parent_rel = table_openrv(parent, ShareUpdateExclusiveLock);
17240 :
17241 : /*
17242 : * Must be owner of both parent and child -- child was checked by
17243 : * ATSimplePermissions call in ATPrepCmd
17244 : */
17245 446 : ATSimplePermissions(AT_AddInherit, parent_rel,
17246 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
17247 :
17248 : /* Permanent rels cannot inherit from temporary ones */
17249 446 : if (parent_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17250 6 : child_rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
17251 0 : ereport(ERROR,
17252 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17253 : errmsg("cannot inherit from temporary relation \"%s\"",
17254 : RelationGetRelationName(parent_rel))));
17255 :
17256 : /* If parent rel is temp, it must belong to this session */
17257 446 : if (RELATION_IS_OTHER_TEMP(parent_rel))
17258 0 : ereport(ERROR,
17259 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17260 : errmsg("cannot inherit from temporary relation of another session")));
17261 :
17262 : /* Ditto for the child */
17263 446 : if (RELATION_IS_OTHER_TEMP(child_rel))
17264 0 : ereport(ERROR,
17265 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17266 : errmsg("cannot inherit to temporary relation of another session")));
17267 :
17268 : /* Prevent partitioned tables from becoming inheritance parents */
17269 446 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17270 6 : ereport(ERROR,
17271 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17272 : errmsg("cannot inherit from partitioned table \"%s\"",
17273 : parent->relname)));
17274 :
17275 : /* Likewise for partitions */
17276 440 : if (parent_rel->rd_rel->relispartition)
17277 6 : ereport(ERROR,
17278 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17279 : errmsg("cannot inherit from a partition")));
17280 :
17281 : /*
17282 : * Prevent circularity by seeing if proposed parent inherits from child.
17283 : * (In particular, this disallows making a rel inherit from itself.)
17284 : *
17285 : * This is not completely bulletproof because of race conditions: in
17286 : * multi-level inheritance trees, someone else could concurrently be
17287 : * making another inheritance link that closes the loop but does not join
17288 : * either of the rels we have locked. Preventing that seems to require
17289 : * exclusive locks on the entire inheritance tree, which is a cure worse
17290 : * than the disease. find_all_inheritors() will cope with circularity
17291 : * anyway, so don't sweat it too much.
17292 : *
17293 : * We use weakest lock we can on child's children, namely AccessShareLock.
17294 : */
17295 434 : children = find_all_inheritors(RelationGetRelid(child_rel),
17296 : AccessShareLock, NULL);
17297 :
17298 434 : if (list_member_oid(children, RelationGetRelid(parent_rel)))
17299 12 : ereport(ERROR,
17300 : (errcode(ERRCODE_DUPLICATE_TABLE),
17301 : errmsg("circular inheritance not allowed"),
17302 : errdetail("\"%s\" is already a child of \"%s\".",
17303 : parent->relname,
17304 : RelationGetRelationName(child_rel))));
17305 :
17306 : /*
17307 : * If child_rel has row-level triggers with transition tables, we
17308 : * currently don't allow it to become an inheritance child. See also
17309 : * prohibitions in ATExecAttachPartition() and CreateTrigger().
17310 : */
17311 422 : trigger_name = FindTriggerIncompatibleWithInheritance(child_rel->trigdesc);
17312 422 : if (trigger_name != NULL)
17313 6 : ereport(ERROR,
17314 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
17315 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming an inheritance child",
17316 : trigger_name, RelationGetRelationName(child_rel)),
17317 : errdetail("ROW triggers with transition tables are not supported in inheritance hierarchies.")));
17318 :
17319 : /* OK to create inheritance */
17320 416 : CreateInheritance(child_rel, parent_rel, false);
17321 :
17322 326 : ObjectAddressSet(address, RelationRelationId,
17323 : RelationGetRelid(parent_rel));
17324 :
17325 : /* keep our lock on the parent relation until commit */
17326 326 : table_close(parent_rel, NoLock);
17327 :
17328 326 : return address;
17329 : }
17330 :
17331 : /*
17332 : * CreateInheritance
17333 : * Catalog manipulation portion of creating inheritance between a child
17334 : * table and a parent table.
17335 : *
17336 : * Common to ATExecAddInherit() and ATExecAttachPartition().
17337 : */
17338 : static void
17339 2666 : CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition)
17340 : {
17341 : Relation catalogRelation;
17342 : SysScanDesc scan;
17343 : ScanKeyData key;
17344 : HeapTuple inheritsTuple;
17345 : int32 inhseqno;
17346 :
17347 : /* Note: get RowExclusiveLock because we will write pg_inherits below. */
17348 2666 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17349 :
17350 : /*
17351 : * Check for duplicates in the list of parents, and determine the highest
17352 : * inhseqno already present; we'll use the next one for the new parent.
17353 : * Also, if proposed child is a partition, it cannot already be
17354 : * inheriting.
17355 : *
17356 : * Note: we do not reject the case where the child already inherits from
17357 : * the parent indirectly; CREATE TABLE doesn't reject comparable cases.
17358 : */
17359 2666 : ScanKeyInit(&key,
17360 : Anum_pg_inherits_inhrelid,
17361 : BTEqualStrategyNumber, F_OIDEQ,
17362 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17363 2666 : scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId,
17364 : true, NULL, 1, &key);
17365 :
17366 : /* inhseqno sequences start at 1 */
17367 2666 : inhseqno = 0;
17368 2736 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17369 : {
17370 76 : Form_pg_inherits inh = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17371 :
17372 76 : if (inh->inhparent == RelationGetRelid(parent_rel))
17373 6 : ereport(ERROR,
17374 : (errcode(ERRCODE_DUPLICATE_TABLE),
17375 : errmsg("relation \"%s\" would be inherited from more than once",
17376 : RelationGetRelationName(parent_rel))));
17377 :
17378 70 : if (inh->inhseqno > inhseqno)
17379 70 : inhseqno = inh->inhseqno;
17380 : }
17381 2660 : systable_endscan(scan);
17382 :
17383 : /* Match up the columns and bump attinhcount as needed */
17384 2660 : MergeAttributesIntoExisting(child_rel, parent_rel, ispartition);
17385 :
17386 : /* Match up the constraints and bump coninhcount as needed */
17387 2528 : MergeConstraintsIntoExisting(child_rel, parent_rel);
17388 :
17389 : /*
17390 : * OK, it looks valid. Make the catalog entries that show inheritance.
17391 : */
17392 2468 : StoreCatalogInheritance1(RelationGetRelid(child_rel),
17393 : RelationGetRelid(parent_rel),
17394 : inhseqno + 1,
17395 : catalogRelation,
17396 2468 : parent_rel->rd_rel->relkind ==
17397 : RELKIND_PARTITIONED_TABLE);
17398 :
17399 : /* Now we're done with pg_inherits */
17400 2468 : table_close(catalogRelation, RowExclusiveLock);
17401 2468 : }
17402 :
17403 : /*
17404 : * Obtain the source-text form of the constraint expression for a check
17405 : * constraint, given its pg_constraint tuple
17406 : */
17407 : static char *
17408 184 : decompile_conbin(HeapTuple contup, TupleDesc tupdesc)
17409 : {
17410 : Form_pg_constraint con;
17411 : bool isnull;
17412 : Datum attr;
17413 : Datum expr;
17414 :
17415 184 : con = (Form_pg_constraint) GETSTRUCT(contup);
17416 184 : attr = heap_getattr(contup, Anum_pg_constraint_conbin, tupdesc, &isnull);
17417 184 : if (isnull)
17418 0 : elog(ERROR, "null conbin for constraint %u", con->oid);
17419 :
17420 184 : expr = DirectFunctionCall2(pg_get_expr, attr,
17421 : ObjectIdGetDatum(con->conrelid));
17422 184 : return TextDatumGetCString(expr);
17423 : }
17424 :
17425 : /*
17426 : * Determine whether two check constraints are functionally equivalent
17427 : *
17428 : * The test we apply is to see whether they reverse-compile to the same
17429 : * source string. This insulates us from issues like whether attributes
17430 : * have the same physical column numbers in parent and child relations.
17431 : *
17432 : * Note that we ignore enforceability as there are cases where constraints
17433 : * with differing enforceability are allowed.
17434 : */
17435 : static bool
17436 92 : constraints_equivalent(HeapTuple a, HeapTuple b, TupleDesc tupleDesc)
17437 : {
17438 92 : Form_pg_constraint acon = (Form_pg_constraint) GETSTRUCT(a);
17439 92 : Form_pg_constraint bcon = (Form_pg_constraint) GETSTRUCT(b);
17440 :
17441 92 : if (acon->condeferrable != bcon->condeferrable ||
17442 92 : acon->condeferred != bcon->condeferred ||
17443 92 : strcmp(decompile_conbin(a, tupleDesc),
17444 92 : decompile_conbin(b, tupleDesc)) != 0)
17445 6 : return false;
17446 : else
17447 86 : return true;
17448 : }
17449 :
17450 : /*
17451 : * Check columns in child table match up with columns in parent, and increment
17452 : * their attinhcount.
17453 : *
17454 : * Called by CreateInheritance
17455 : *
17456 : * Currently all parent columns must be found in child. Missing columns are an
17457 : * error. One day we might consider creating new columns like CREATE TABLE
17458 : * does. However, that is widely unpopular --- in the common use case of
17459 : * partitioned tables it's a foot-gun.
17460 : *
17461 : * The data type must match exactly. If the parent column is NOT NULL then
17462 : * the child must be as well. Defaults are not compared, however.
17463 : */
17464 : static void
17465 2660 : MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition)
17466 : {
17467 : Relation attrrel;
17468 : TupleDesc parent_desc;
17469 :
17470 2660 : attrrel = table_open(AttributeRelationId, RowExclusiveLock);
17471 2660 : parent_desc = RelationGetDescr(parent_rel);
17472 :
17473 8486 : for (AttrNumber parent_attno = 1; parent_attno <= parent_desc->natts; parent_attno++)
17474 : {
17475 5958 : Form_pg_attribute parent_att = TupleDescAttr(parent_desc, parent_attno - 1);
17476 5958 : char *parent_attname = NameStr(parent_att->attname);
17477 : HeapTuple tuple;
17478 :
17479 : /* Ignore dropped columns in the parent. */
17480 5958 : if (parent_att->attisdropped)
17481 296 : continue;
17482 :
17483 : /* Find same column in child (matching on column name). */
17484 5662 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(child_rel), parent_attname);
17485 5662 : if (HeapTupleIsValid(tuple))
17486 : {
17487 5650 : Form_pg_attribute child_att = (Form_pg_attribute) GETSTRUCT(tuple);
17488 :
17489 5650 : if (parent_att->atttypid != child_att->atttypid ||
17490 5644 : parent_att->atttypmod != child_att->atttypmod)
17491 12 : ereport(ERROR,
17492 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17493 : errmsg("child table \"%s\" has different type for column \"%s\"",
17494 : RelationGetRelationName(child_rel), parent_attname)));
17495 :
17496 5638 : if (parent_att->attcollation != child_att->attcollation)
17497 6 : ereport(ERROR,
17498 : (errcode(ERRCODE_COLLATION_MISMATCH),
17499 : errmsg("child table \"%s\" has different collation for column \"%s\"",
17500 : RelationGetRelationName(child_rel), parent_attname)));
17501 :
17502 : /*
17503 : * If the parent has a not-null constraint that's not NO INHERIT,
17504 : * make sure the child has one too.
17505 : *
17506 : * Other constraints are checked elsewhere.
17507 : */
17508 5632 : if (parent_att->attnotnull && !child_att->attnotnull)
17509 : {
17510 : HeapTuple contup;
17511 :
17512 48 : contup = findNotNullConstraintAttnum(RelationGetRelid(parent_rel),
17513 48 : parent_att->attnum);
17514 48 : if (HeapTupleIsValid(contup) &&
17515 48 : !((Form_pg_constraint) GETSTRUCT(contup))->connoinherit)
17516 30 : ereport(ERROR,
17517 : errcode(ERRCODE_DATATYPE_MISMATCH),
17518 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17519 : parent_attname, RelationGetRelationName(child_rel)));
17520 : }
17521 :
17522 : /*
17523 : * Child column must be generated if and only if parent column is.
17524 : */
17525 5602 : if (parent_att->attgenerated && !child_att->attgenerated)
17526 36 : ereport(ERROR,
17527 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17528 : errmsg("column \"%s\" in child table must be a generated column", parent_attname)));
17529 5566 : if (child_att->attgenerated && !parent_att->attgenerated)
17530 24 : ereport(ERROR,
17531 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17532 : errmsg("column \"%s\" in child table must not be a generated column", parent_attname)));
17533 :
17534 5542 : if (parent_att->attgenerated && child_att->attgenerated && child_att->attgenerated != parent_att->attgenerated)
17535 12 : ereport(ERROR,
17536 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17537 : errmsg("column \"%s\" inherits from generated column of different kind", parent_attname),
17538 : errdetail("Parent column is %s, child column is %s.",
17539 : parent_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
17540 : child_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
17541 :
17542 : /*
17543 : * Regular inheritance children are independent enough not to
17544 : * inherit identity columns. But partitions are integral part of
17545 : * a partitioned table and inherit identity column.
17546 : */
17547 5530 : if (ispartition)
17548 4802 : child_att->attidentity = parent_att->attidentity;
17549 :
17550 : /*
17551 : * OK, bump the child column's inheritance count. (If we fail
17552 : * later on, this change will just roll back.)
17553 : */
17554 5530 : if (pg_add_s16_overflow(child_att->attinhcount, 1,
17555 : &child_att->attinhcount))
17556 0 : ereport(ERROR,
17557 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17558 : errmsg("too many inheritance parents"));
17559 :
17560 : /*
17561 : * In case of partitions, we must enforce that value of attislocal
17562 : * is same in all partitions. (Note: there are only inherited
17563 : * attributes in partitions)
17564 : */
17565 5530 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17566 : {
17567 : Assert(child_att->attinhcount == 1);
17568 4802 : child_att->attislocal = false;
17569 : }
17570 :
17571 5530 : CatalogTupleUpdate(attrrel, &tuple->t_self, tuple);
17572 5530 : heap_freetuple(tuple);
17573 : }
17574 : else
17575 : {
17576 12 : ereport(ERROR,
17577 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17578 : errmsg("child table is missing column \"%s\"", parent_attname)));
17579 : }
17580 : }
17581 :
17582 2528 : table_close(attrrel, RowExclusiveLock);
17583 2528 : }
17584 :
17585 : /*
17586 : * Check constraints in child table match up with constraints in parent,
17587 : * and increment their coninhcount.
17588 : *
17589 : * Constraints that are marked ONLY in the parent are ignored.
17590 : *
17591 : * Called by CreateInheritance
17592 : *
17593 : * Currently all constraints in parent must be present in the child. One day we
17594 : * may consider adding new constraints like CREATE TABLE does.
17595 : *
17596 : * XXX This is O(N^2) which may be an issue with tables with hundreds of
17597 : * constraints. As long as tables have more like 10 constraints it shouldn't be
17598 : * a problem though. Even 100 constraints ought not be the end of the world.
17599 : *
17600 : * XXX See MergeWithExistingConstraint too if you change this code.
17601 : */
17602 : static void
17603 2528 : MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel)
17604 : {
17605 : Relation constraintrel;
17606 : SysScanDesc parent_scan;
17607 : ScanKeyData parent_key;
17608 : HeapTuple parent_tuple;
17609 2528 : Oid parent_relid = RelationGetRelid(parent_rel);
17610 : AttrMap *attmap;
17611 :
17612 2528 : constraintrel = table_open(ConstraintRelationId, RowExclusiveLock);
17613 :
17614 : /* Outer loop scans through the parent's constraint definitions */
17615 2528 : ScanKeyInit(&parent_key,
17616 : Anum_pg_constraint_conrelid,
17617 : BTEqualStrategyNumber, F_OIDEQ,
17618 : ObjectIdGetDatum(parent_relid));
17619 2528 : parent_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17620 : true, NULL, 1, &parent_key);
17621 :
17622 2528 : attmap = build_attrmap_by_name(RelationGetDescr(parent_rel),
17623 : RelationGetDescr(child_rel),
17624 : true);
17625 :
17626 4478 : while (HeapTupleIsValid(parent_tuple = systable_getnext(parent_scan)))
17627 : {
17628 2010 : Form_pg_constraint parent_con = (Form_pg_constraint) GETSTRUCT(parent_tuple);
17629 : SysScanDesc child_scan;
17630 : ScanKeyData child_key;
17631 : HeapTuple child_tuple;
17632 : AttrNumber parent_attno;
17633 2010 : bool found = false;
17634 :
17635 2010 : if (parent_con->contype != CONSTRAINT_CHECK &&
17636 1874 : parent_con->contype != CONSTRAINT_NOTNULL)
17637 994 : continue;
17638 :
17639 : /* if the parent's constraint is marked NO INHERIT, it's not inherited */
17640 1060 : if (parent_con->connoinherit)
17641 44 : continue;
17642 :
17643 1016 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17644 900 : parent_attno = extractNotNullColumn(parent_tuple);
17645 : else
17646 116 : parent_attno = InvalidAttrNumber;
17647 :
17648 : /* Search for a child constraint matching this one */
17649 1016 : ScanKeyInit(&child_key,
17650 : Anum_pg_constraint_conrelid,
17651 : BTEqualStrategyNumber, F_OIDEQ,
17652 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17653 1016 : child_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17654 : true, NULL, 1, &child_key);
17655 :
17656 1594 : while (HeapTupleIsValid(child_tuple = systable_getnext(child_scan)))
17657 : {
17658 1570 : Form_pg_constraint child_con = (Form_pg_constraint) GETSTRUCT(child_tuple);
17659 : HeapTuple child_copy;
17660 :
17661 1570 : if (child_con->contype != parent_con->contype)
17662 280 : continue;
17663 :
17664 : /*
17665 : * CHECK constraint are matched by constraint name, NOT NULL ones
17666 : * by attribute number.
17667 : */
17668 1290 : if (child_con->contype == CONSTRAINT_CHECK)
17669 : {
17670 152 : if (strcmp(NameStr(parent_con->conname),
17671 122 : NameStr(child_con->conname)) != 0)
17672 30 : continue;
17673 : }
17674 1168 : else if (child_con->contype == CONSTRAINT_NOTNULL)
17675 : {
17676 : Form_pg_attribute parent_attr;
17677 : Form_pg_attribute child_attr;
17678 : AttrNumber child_attno;
17679 :
17680 1168 : parent_attr = TupleDescAttr(parent_rel->rd_att, parent_attno - 1);
17681 1168 : child_attno = extractNotNullColumn(child_tuple);
17682 1168 : if (parent_attno != attmap->attnums[child_attno - 1])
17683 268 : continue;
17684 :
17685 900 : child_attr = TupleDescAttr(child_rel->rd_att, child_attno - 1);
17686 : /* there shouldn't be constraints on dropped columns */
17687 900 : if (parent_attr->attisdropped || child_attr->attisdropped)
17688 0 : elog(ERROR, "found not-null constraint on dropped columns");
17689 : }
17690 :
17691 992 : if (child_con->contype == CONSTRAINT_CHECK &&
17692 92 : !constraints_equivalent(parent_tuple, child_tuple, RelationGetDescr(constraintrel)))
17693 6 : ereport(ERROR,
17694 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17695 : errmsg("child table \"%s\" has different definition for check constraint \"%s\"",
17696 : RelationGetRelationName(child_rel), NameStr(parent_con->conname))));
17697 :
17698 : /*
17699 : * If the child constraint is "no inherit" then cannot merge
17700 : */
17701 986 : if (child_con->connoinherit)
17702 12 : ereport(ERROR,
17703 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17704 : errmsg("constraint \"%s\" conflicts with non-inherited constraint on child table \"%s\"",
17705 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17706 :
17707 : /*
17708 : * If the child constraint is "not valid" then cannot merge with a
17709 : * valid parent constraint
17710 : */
17711 974 : if (parent_con->convalidated && child_con->conenforced &&
17712 920 : !child_con->convalidated)
17713 12 : ereport(ERROR,
17714 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17715 : errmsg("constraint \"%s\" conflicts with NOT VALID constraint on child table \"%s\"",
17716 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17717 :
17718 : /*
17719 : * A NOT ENFORCED child constraint cannot be merged with an
17720 : * ENFORCED parent constraint. However, the reverse is allowed,
17721 : * where the child constraint is ENFORCED.
17722 : */
17723 962 : if (parent_con->conenforced && !child_con->conenforced)
17724 6 : ereport(ERROR,
17725 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17726 : errmsg("constraint \"%s\" conflicts with NOT ENFORCED constraint on child table \"%s\"",
17727 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17728 :
17729 : /*
17730 : * OK, bump the child constraint's inheritance count. (If we fail
17731 : * later on, this change will just roll back.)
17732 : */
17733 956 : child_copy = heap_copytuple(child_tuple);
17734 956 : child_con = (Form_pg_constraint) GETSTRUCT(child_copy);
17735 :
17736 956 : if (pg_add_s16_overflow(child_con->coninhcount, 1,
17737 : &child_con->coninhcount))
17738 0 : ereport(ERROR,
17739 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17740 : errmsg("too many inheritance parents"));
17741 :
17742 : /*
17743 : * In case of partitions, an inherited constraint must be
17744 : * inherited only once since it cannot have multiple parents and
17745 : * it is never considered local.
17746 : */
17747 956 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17748 : {
17749 : Assert(child_con->coninhcount == 1);
17750 808 : child_con->conislocal = false;
17751 : }
17752 :
17753 956 : CatalogTupleUpdate(constraintrel, &child_copy->t_self, child_copy);
17754 956 : heap_freetuple(child_copy);
17755 :
17756 956 : found = true;
17757 956 : break;
17758 : }
17759 :
17760 980 : systable_endscan(child_scan);
17761 :
17762 980 : if (!found)
17763 : {
17764 24 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17765 0 : ereport(ERROR,
17766 : errcode(ERRCODE_DATATYPE_MISMATCH),
17767 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17768 : get_attname(parent_relid,
17769 : extractNotNullColumn(parent_tuple),
17770 : false),
17771 : RelationGetRelationName(child_rel)));
17772 :
17773 24 : ereport(ERROR,
17774 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17775 : errmsg("child table is missing constraint \"%s\"",
17776 : NameStr(parent_con->conname))));
17777 : }
17778 : }
17779 :
17780 2468 : systable_endscan(parent_scan);
17781 2468 : table_close(constraintrel, RowExclusiveLock);
17782 2468 : }
17783 :
17784 : /*
17785 : * ALTER TABLE NO INHERIT
17786 : *
17787 : * Return value is the address of the relation that is no longer parent.
17788 : */
17789 : static ObjectAddress
17790 94 : ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode)
17791 : {
17792 : ObjectAddress address;
17793 : Relation parent_rel;
17794 :
17795 94 : if (rel->rd_rel->relispartition)
17796 0 : ereport(ERROR,
17797 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17798 : errmsg("cannot change inheritance of a partition")));
17799 :
17800 : /*
17801 : * AccessShareLock on the parent is probably enough, seeing that DROP
17802 : * TABLE doesn't lock parent tables at all. We need some lock since we'll
17803 : * be inspecting the parent's schema.
17804 : */
17805 94 : parent_rel = table_openrv(parent, AccessShareLock);
17806 :
17807 : /*
17808 : * We don't bother to check ownership of the parent table --- ownership of
17809 : * the child is presumed enough rights.
17810 : */
17811 :
17812 : /* Off to RemoveInheritance() where most of the work happens */
17813 94 : RemoveInheritance(rel, parent_rel, false);
17814 :
17815 88 : ObjectAddressSet(address, RelationRelationId,
17816 : RelationGetRelid(parent_rel));
17817 :
17818 : /* keep our lock on the parent relation until commit */
17819 88 : table_close(parent_rel, NoLock);
17820 :
17821 88 : return address;
17822 : }
17823 :
17824 : /*
17825 : * MarkInheritDetached
17826 : *
17827 : * Set inhdetachpending for a partition, for ATExecDetachPartition
17828 : * in concurrent mode. While at it, verify that no other partition is
17829 : * already pending detach.
17830 : */
17831 : static void
17832 146 : MarkInheritDetached(Relation child_rel, Relation parent_rel)
17833 : {
17834 : Relation catalogRelation;
17835 : SysScanDesc scan;
17836 : ScanKeyData key;
17837 : HeapTuple inheritsTuple;
17838 146 : bool found = false;
17839 :
17840 : Assert(parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
17841 :
17842 : /*
17843 : * Find pg_inherits entries by inhparent. (We need to scan them all in
17844 : * order to verify that no other partition is pending detach.)
17845 : */
17846 146 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17847 146 : ScanKeyInit(&key,
17848 : Anum_pg_inherits_inhparent,
17849 : BTEqualStrategyNumber, F_OIDEQ,
17850 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
17851 146 : scan = systable_beginscan(catalogRelation, InheritsParentIndexId,
17852 : true, NULL, 1, &key);
17853 :
17854 576 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17855 : {
17856 : Form_pg_inherits inhForm;
17857 :
17858 286 : inhForm = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17859 286 : if (inhForm->inhdetachpending)
17860 2 : ereport(ERROR,
17861 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
17862 : errmsg("partition \"%s\" already pending detach in partitioned table \"%s.%s\"",
17863 : get_rel_name(inhForm->inhrelid),
17864 : get_namespace_name(parent_rel->rd_rel->relnamespace),
17865 : RelationGetRelationName(parent_rel)),
17866 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
17867 :
17868 284 : if (inhForm->inhrelid == RelationGetRelid(child_rel))
17869 : {
17870 : HeapTuple newtup;
17871 :
17872 144 : newtup = heap_copytuple(inheritsTuple);
17873 144 : ((Form_pg_inherits) GETSTRUCT(newtup))->inhdetachpending = true;
17874 :
17875 144 : CatalogTupleUpdate(catalogRelation,
17876 144 : &inheritsTuple->t_self,
17877 : newtup);
17878 144 : found = true;
17879 144 : heap_freetuple(newtup);
17880 : /* keep looking, to ensure we catch others pending detach */
17881 : }
17882 : }
17883 :
17884 : /* Done */
17885 144 : systable_endscan(scan);
17886 144 : table_close(catalogRelation, RowExclusiveLock);
17887 :
17888 144 : if (!found)
17889 0 : ereport(ERROR,
17890 : (errcode(ERRCODE_UNDEFINED_TABLE),
17891 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
17892 : RelationGetRelationName(child_rel),
17893 : RelationGetRelationName(parent_rel))));
17894 144 : }
17895 :
17896 : /*
17897 : * RemoveInheritance
17898 : *
17899 : * Drop a parent from the child's parents. This just adjusts the attinhcount
17900 : * and attislocal of the columns and removes the pg_inherit and pg_depend
17901 : * entries. expect_detached is passed down to DeleteInheritsTuple, q.v..
17902 : *
17903 : * If attinhcount goes to 0 then attislocal gets set to true. If it goes back
17904 : * up attislocal stays true, which means if a child is ever removed from a
17905 : * parent then its columns will never be automatically dropped which may
17906 : * surprise. But at least we'll never surprise by dropping columns someone
17907 : * isn't expecting to be dropped which would actually mean data loss.
17908 : *
17909 : * coninhcount and conislocal for inherited constraints are adjusted in
17910 : * exactly the same way.
17911 : *
17912 : * Common to ATExecDropInherit() and ATExecDetachPartition().
17913 : */
17914 : static void
17915 606 : RemoveInheritance(Relation child_rel, Relation parent_rel, bool expect_detached)
17916 : {
17917 : Relation catalogRelation;
17918 : SysScanDesc scan;
17919 : ScanKeyData key[3];
17920 : HeapTuple attributeTuple,
17921 : constraintTuple;
17922 : AttrMap *attmap;
17923 : List *connames;
17924 : List *nncolumns;
17925 : bool found;
17926 : bool is_partitioning;
17927 :
17928 606 : is_partitioning = (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
17929 :
17930 606 : found = DeleteInheritsTuple(RelationGetRelid(child_rel),
17931 : RelationGetRelid(parent_rel),
17932 : expect_detached,
17933 606 : RelationGetRelationName(child_rel));
17934 606 : if (!found)
17935 : {
17936 24 : if (is_partitioning)
17937 18 : ereport(ERROR,
17938 : (errcode(ERRCODE_UNDEFINED_TABLE),
17939 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
17940 : RelationGetRelationName(child_rel),
17941 : RelationGetRelationName(parent_rel))));
17942 : else
17943 6 : ereport(ERROR,
17944 : (errcode(ERRCODE_UNDEFINED_TABLE),
17945 : errmsg("relation \"%s\" is not a parent of relation \"%s\"",
17946 : RelationGetRelationName(parent_rel),
17947 : RelationGetRelationName(child_rel))));
17948 : }
17949 :
17950 : /*
17951 : * Search through child columns looking for ones matching parent rel
17952 : */
17953 582 : catalogRelation = table_open(AttributeRelationId, RowExclusiveLock);
17954 582 : ScanKeyInit(&key[0],
17955 : Anum_pg_attribute_attrelid,
17956 : BTEqualStrategyNumber, F_OIDEQ,
17957 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17958 582 : scan = systable_beginscan(catalogRelation, AttributeRelidNumIndexId,
17959 : true, NULL, 1, key);
17960 5198 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
17961 : {
17962 4616 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
17963 :
17964 : /* Ignore if dropped or not inherited */
17965 4616 : if (att->attisdropped)
17966 6 : continue;
17967 4610 : if (att->attinhcount <= 0)
17968 3522 : continue;
17969 :
17970 1088 : if (SearchSysCacheExistsAttName(RelationGetRelid(parent_rel),
17971 1088 : NameStr(att->attname)))
17972 : {
17973 : /* Decrement inhcount and possibly set islocal to true */
17974 1034 : HeapTuple copyTuple = heap_copytuple(attributeTuple);
17975 1034 : Form_pg_attribute copy_att = (Form_pg_attribute) GETSTRUCT(copyTuple);
17976 :
17977 1034 : copy_att->attinhcount--;
17978 1034 : if (copy_att->attinhcount == 0)
17979 1004 : copy_att->attislocal = true;
17980 :
17981 1034 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
17982 1034 : heap_freetuple(copyTuple);
17983 : }
17984 : }
17985 582 : systable_endscan(scan);
17986 582 : table_close(catalogRelation, RowExclusiveLock);
17987 :
17988 : /*
17989 : * Likewise, find inherited check and not-null constraints and disinherit
17990 : * them. To do this, we first need a list of the names of the parent's
17991 : * check constraints. (We cheat a bit by only checking for name matches,
17992 : * assuming that the expressions will match.)
17993 : *
17994 : * For NOT NULL columns, we store column numbers to match, mapping them in
17995 : * to the child rel's attribute numbers.
17996 : */
17997 582 : attmap = build_attrmap_by_name(RelationGetDescr(child_rel),
17998 : RelationGetDescr(parent_rel),
17999 : false);
18000 :
18001 582 : catalogRelation = table_open(ConstraintRelationId, RowExclusiveLock);
18002 582 : ScanKeyInit(&key[0],
18003 : Anum_pg_constraint_conrelid,
18004 : BTEqualStrategyNumber, F_OIDEQ,
18005 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
18006 582 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18007 : true, NULL, 1, key);
18008 :
18009 582 : connames = NIL;
18010 582 : nncolumns = NIL;
18011 :
18012 1236 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18013 : {
18014 654 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18015 :
18016 654 : if (con->connoinherit)
18017 110 : continue;
18018 :
18019 544 : if (con->contype == CONSTRAINT_CHECK)
18020 12 : connames = lappend(connames, pstrdup(NameStr(con->conname)));
18021 544 : if (con->contype == CONSTRAINT_NOTNULL)
18022 : {
18023 208 : AttrNumber parent_attno = extractNotNullColumn(constraintTuple);
18024 :
18025 208 : nncolumns = lappend_int(nncolumns, attmap->attnums[parent_attno - 1]);
18026 : }
18027 : }
18028 :
18029 582 : systable_endscan(scan);
18030 :
18031 : /* Now scan the child's constraints to find matches */
18032 582 : ScanKeyInit(&key[0],
18033 : Anum_pg_constraint_conrelid,
18034 : BTEqualStrategyNumber, F_OIDEQ,
18035 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
18036 582 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
18037 : true, NULL, 1, key);
18038 :
18039 1232 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
18040 : {
18041 650 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
18042 650 : bool match = false;
18043 :
18044 : /*
18045 : * Match CHECK constraints by name, not-null constraints by column
18046 : * number, and ignore all others.
18047 : */
18048 650 : if (con->contype == CONSTRAINT_CHECK)
18049 : {
18050 142 : foreach_ptr(char, chkname, connames)
18051 : {
18052 18 : if (con->contype == CONSTRAINT_CHECK &&
18053 18 : strcmp(NameStr(con->conname), chkname) == 0)
18054 : {
18055 12 : match = true;
18056 12 : connames = foreach_delete_current(connames, chkname);
18057 12 : break;
18058 : }
18059 : }
18060 : }
18061 582 : else if (con->contype == CONSTRAINT_NOTNULL)
18062 : {
18063 268 : AttrNumber child_attno = extractNotNullColumn(constraintTuple);
18064 :
18065 542 : foreach_int(prevattno, nncolumns)
18066 : {
18067 214 : if (prevattno == child_attno)
18068 : {
18069 208 : match = true;
18070 208 : nncolumns = foreach_delete_current(nncolumns, prevattno);
18071 208 : break;
18072 : }
18073 : }
18074 : }
18075 : else
18076 314 : continue;
18077 :
18078 336 : if (match)
18079 : {
18080 : /* Decrement inhcount and possibly set islocal to true */
18081 220 : HeapTuple copyTuple = heap_copytuple(constraintTuple);
18082 220 : Form_pg_constraint copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
18083 :
18084 220 : if (copy_con->coninhcount <= 0) /* shouldn't happen */
18085 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
18086 : RelationGetRelid(child_rel), NameStr(copy_con->conname));
18087 :
18088 220 : copy_con->coninhcount--;
18089 220 : if (copy_con->coninhcount == 0)
18090 202 : copy_con->conislocal = true;
18091 :
18092 220 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18093 220 : heap_freetuple(copyTuple);
18094 : }
18095 : }
18096 :
18097 : /* We should have matched all constraints */
18098 582 : if (connames != NIL || nncolumns != NIL)
18099 0 : elog(ERROR, "%d unmatched constraints while removing inheritance from \"%s\" to \"%s\"",
18100 : list_length(connames) + list_length(nncolumns),
18101 : RelationGetRelationName(child_rel), RelationGetRelationName(parent_rel));
18102 :
18103 582 : systable_endscan(scan);
18104 582 : table_close(catalogRelation, RowExclusiveLock);
18105 :
18106 582 : drop_parent_dependency(RelationGetRelid(child_rel),
18107 : RelationRelationId,
18108 : RelationGetRelid(parent_rel),
18109 : child_dependency_type(is_partitioning));
18110 :
18111 : /*
18112 : * Post alter hook of this inherits. Since object_access_hook doesn't take
18113 : * multiple object identifiers, we relay oid of parent relation using
18114 : * auxiliary_id argument.
18115 : */
18116 582 : InvokeObjectPostAlterHookArg(InheritsRelationId,
18117 : RelationGetRelid(child_rel), 0,
18118 : RelationGetRelid(parent_rel), false);
18119 582 : }
18120 :
18121 : /*
18122 : * Drop the dependency created by StoreCatalogInheritance1 (CREATE TABLE
18123 : * INHERITS/ALTER TABLE INHERIT -- refclassid will be RelationRelationId) or
18124 : * heap_create_with_catalog (CREATE TABLE OF/ALTER TABLE OF -- refclassid will
18125 : * be TypeRelationId). There's no convenient way to do this, so go trawling
18126 : * through pg_depend.
18127 : */
18128 : static void
18129 594 : drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
18130 : DependencyType deptype)
18131 : {
18132 : Relation catalogRelation;
18133 : SysScanDesc scan;
18134 : ScanKeyData key[3];
18135 : HeapTuple depTuple;
18136 :
18137 594 : catalogRelation = table_open(DependRelationId, RowExclusiveLock);
18138 :
18139 594 : ScanKeyInit(&key[0],
18140 : Anum_pg_depend_classid,
18141 : BTEqualStrategyNumber, F_OIDEQ,
18142 : ObjectIdGetDatum(RelationRelationId));
18143 594 : ScanKeyInit(&key[1],
18144 : Anum_pg_depend_objid,
18145 : BTEqualStrategyNumber, F_OIDEQ,
18146 : ObjectIdGetDatum(relid));
18147 594 : ScanKeyInit(&key[2],
18148 : Anum_pg_depend_objsubid,
18149 : BTEqualStrategyNumber, F_INT4EQ,
18150 : Int32GetDatum(0));
18151 :
18152 594 : scan = systable_beginscan(catalogRelation, DependDependerIndexId, true,
18153 : NULL, 3, key);
18154 :
18155 1846 : while (HeapTupleIsValid(depTuple = systable_getnext(scan)))
18156 : {
18157 1252 : Form_pg_depend dep = (Form_pg_depend) GETSTRUCT(depTuple);
18158 :
18159 1252 : if (dep->refclassid == refclassid &&
18160 636 : dep->refobjid == refobjid &&
18161 594 : dep->refobjsubid == 0 &&
18162 594 : dep->deptype == deptype)
18163 594 : CatalogTupleDelete(catalogRelation, &depTuple->t_self);
18164 : }
18165 :
18166 594 : systable_endscan(scan);
18167 594 : table_close(catalogRelation, RowExclusiveLock);
18168 594 : }
18169 :
18170 : /*
18171 : * ALTER TABLE OF
18172 : *
18173 : * Attach a table to a composite type, as though it had been created with CREATE
18174 : * TABLE OF. All attname, atttypid, atttypmod and attcollation must match. The
18175 : * subject table must not have inheritance parents. These restrictions ensure
18176 : * that you cannot create a configuration impossible with CREATE TABLE OF alone.
18177 : *
18178 : * The address of the type is returned.
18179 : */
18180 : static ObjectAddress
18181 66 : ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode)
18182 : {
18183 66 : Oid relid = RelationGetRelid(rel);
18184 : Type typetuple;
18185 : Form_pg_type typeform;
18186 : Oid typeid;
18187 : Relation inheritsRelation,
18188 : relationRelation;
18189 : SysScanDesc scan;
18190 : ScanKeyData key;
18191 : AttrNumber table_attno,
18192 : type_attno;
18193 : TupleDesc typeTupleDesc,
18194 : tableTupleDesc;
18195 : ObjectAddress tableobj,
18196 : typeobj;
18197 : HeapTuple classtuple;
18198 :
18199 : /* Validate the type. */
18200 66 : typetuple = typenameType(NULL, ofTypename, NULL);
18201 66 : check_of_type(typetuple);
18202 66 : typeform = (Form_pg_type) GETSTRUCT(typetuple);
18203 66 : typeid = typeform->oid;
18204 :
18205 : /* Fail if the table has any inheritance parents. */
18206 66 : inheritsRelation = table_open(InheritsRelationId, AccessShareLock);
18207 66 : ScanKeyInit(&key,
18208 : Anum_pg_inherits_inhrelid,
18209 : BTEqualStrategyNumber, F_OIDEQ,
18210 : ObjectIdGetDatum(relid));
18211 66 : scan = systable_beginscan(inheritsRelation, InheritsRelidSeqnoIndexId,
18212 : true, NULL, 1, &key);
18213 66 : if (HeapTupleIsValid(systable_getnext(scan)))
18214 6 : ereport(ERROR,
18215 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18216 : errmsg("typed tables cannot inherit")));
18217 60 : systable_endscan(scan);
18218 60 : table_close(inheritsRelation, AccessShareLock);
18219 :
18220 : /*
18221 : * Check the tuple descriptors for compatibility. Unlike inheritance, we
18222 : * require that the order also match. However, attnotnull need not match.
18223 : */
18224 60 : typeTupleDesc = lookup_rowtype_tupdesc(typeid, -1);
18225 60 : tableTupleDesc = RelationGetDescr(rel);
18226 60 : table_attno = 1;
18227 190 : for (type_attno = 1; type_attno <= typeTupleDesc->natts; type_attno++)
18228 : {
18229 : Form_pg_attribute type_attr,
18230 : table_attr;
18231 : const char *type_attname,
18232 : *table_attname;
18233 :
18234 : /* Get the next non-dropped type attribute. */
18235 154 : type_attr = TupleDescAttr(typeTupleDesc, type_attno - 1);
18236 154 : if (type_attr->attisdropped)
18237 44 : continue;
18238 110 : type_attname = NameStr(type_attr->attname);
18239 :
18240 : /* Get the next non-dropped table attribute. */
18241 : do
18242 : {
18243 122 : if (table_attno > tableTupleDesc->natts)
18244 6 : ereport(ERROR,
18245 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18246 : errmsg("table is missing column \"%s\"",
18247 : type_attname)));
18248 116 : table_attr = TupleDescAttr(tableTupleDesc, table_attno - 1);
18249 116 : table_attno++;
18250 116 : } while (table_attr->attisdropped);
18251 104 : table_attname = NameStr(table_attr->attname);
18252 :
18253 : /* Compare name. */
18254 104 : if (strncmp(table_attname, type_attname, NAMEDATALEN) != 0)
18255 6 : ereport(ERROR,
18256 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18257 : errmsg("table has column \"%s\" where type requires \"%s\"",
18258 : table_attname, type_attname)));
18259 :
18260 : /* Compare type. */
18261 98 : if (table_attr->atttypid != type_attr->atttypid ||
18262 92 : table_attr->atttypmod != type_attr->atttypmod ||
18263 86 : table_attr->attcollation != type_attr->attcollation)
18264 12 : ereport(ERROR,
18265 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18266 : errmsg("table \"%s\" has different type for column \"%s\"",
18267 : RelationGetRelationName(rel), type_attname)));
18268 : }
18269 36 : ReleaseTupleDesc(typeTupleDesc);
18270 :
18271 : /* Any remaining columns at the end of the table had better be dropped. */
18272 36 : for (; table_attno <= tableTupleDesc->natts; table_attno++)
18273 : {
18274 6 : Form_pg_attribute table_attr = TupleDescAttr(tableTupleDesc,
18275 : table_attno - 1);
18276 :
18277 6 : if (!table_attr->attisdropped)
18278 6 : ereport(ERROR,
18279 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18280 : errmsg("table has extra column \"%s\"",
18281 : NameStr(table_attr->attname))));
18282 : }
18283 :
18284 : /* If the table was already typed, drop the existing dependency. */
18285 30 : if (rel->rd_rel->reloftype)
18286 6 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18287 : DEPENDENCY_NORMAL);
18288 :
18289 : /* Record a dependency on the new type. */
18290 30 : tableobj.classId = RelationRelationId;
18291 30 : tableobj.objectId = relid;
18292 30 : tableobj.objectSubId = 0;
18293 30 : typeobj.classId = TypeRelationId;
18294 30 : typeobj.objectId = typeid;
18295 30 : typeobj.objectSubId = 0;
18296 30 : recordDependencyOn(&tableobj, &typeobj, DEPENDENCY_NORMAL);
18297 :
18298 : /* Update pg_class.reloftype */
18299 30 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18300 30 : classtuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18301 30 : if (!HeapTupleIsValid(classtuple))
18302 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18303 30 : ((Form_pg_class) GETSTRUCT(classtuple))->reloftype = typeid;
18304 30 : CatalogTupleUpdate(relationRelation, &classtuple->t_self, classtuple);
18305 :
18306 30 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18307 :
18308 30 : heap_freetuple(classtuple);
18309 30 : table_close(relationRelation, RowExclusiveLock);
18310 :
18311 30 : ReleaseSysCache(typetuple);
18312 :
18313 30 : return typeobj;
18314 : }
18315 :
18316 : /*
18317 : * ALTER TABLE NOT OF
18318 : *
18319 : * Detach a typed table from its originating type. Just clear reloftype and
18320 : * remove the dependency.
18321 : */
18322 : static void
18323 6 : ATExecDropOf(Relation rel, LOCKMODE lockmode)
18324 : {
18325 6 : Oid relid = RelationGetRelid(rel);
18326 : Relation relationRelation;
18327 : HeapTuple tuple;
18328 :
18329 6 : if (!OidIsValid(rel->rd_rel->reloftype))
18330 0 : ereport(ERROR,
18331 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18332 : errmsg("\"%s\" is not a typed table",
18333 : RelationGetRelationName(rel))));
18334 :
18335 : /*
18336 : * We don't bother to check ownership of the type --- ownership of the
18337 : * table is presumed enough rights. No lock required on the type, either.
18338 : */
18339 :
18340 6 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18341 : DEPENDENCY_NORMAL);
18342 :
18343 : /* Clear pg_class.reloftype */
18344 6 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18345 6 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18346 6 : if (!HeapTupleIsValid(tuple))
18347 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18348 6 : ((Form_pg_class) GETSTRUCT(tuple))->reloftype = InvalidOid;
18349 6 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
18350 :
18351 6 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18352 :
18353 6 : heap_freetuple(tuple);
18354 6 : table_close(relationRelation, RowExclusiveLock);
18355 6 : }
18356 :
18357 : /*
18358 : * relation_mark_replica_identity: Update a table's replica identity
18359 : *
18360 : * Iff ri_type = REPLICA_IDENTITY_INDEX, indexOid must be the Oid of a suitable
18361 : * index. Otherwise, it must be InvalidOid.
18362 : *
18363 : * Caller had better hold an exclusive lock on the relation, as the results
18364 : * of running two of these concurrently wouldn't be pretty.
18365 : */
18366 : static void
18367 464 : relation_mark_replica_identity(Relation rel, char ri_type, Oid indexOid,
18368 : bool is_internal)
18369 : {
18370 : Relation pg_index;
18371 : Relation pg_class;
18372 : HeapTuple pg_class_tuple;
18373 : HeapTuple pg_index_tuple;
18374 : Form_pg_class pg_class_form;
18375 : Form_pg_index pg_index_form;
18376 : ListCell *index;
18377 :
18378 : /*
18379 : * Check whether relreplident has changed, and update it if so.
18380 : */
18381 464 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18382 464 : pg_class_tuple = SearchSysCacheCopy1(RELOID,
18383 : ObjectIdGetDatum(RelationGetRelid(rel)));
18384 464 : if (!HeapTupleIsValid(pg_class_tuple))
18385 0 : elog(ERROR, "cache lookup failed for relation \"%s\"",
18386 : RelationGetRelationName(rel));
18387 464 : pg_class_form = (Form_pg_class) GETSTRUCT(pg_class_tuple);
18388 464 : if (pg_class_form->relreplident != ri_type)
18389 : {
18390 414 : pg_class_form->relreplident = ri_type;
18391 414 : CatalogTupleUpdate(pg_class, &pg_class_tuple->t_self, pg_class_tuple);
18392 : }
18393 464 : table_close(pg_class, RowExclusiveLock);
18394 464 : heap_freetuple(pg_class_tuple);
18395 :
18396 : /*
18397 : * Update the per-index indisreplident flags correctly.
18398 : */
18399 464 : pg_index = table_open(IndexRelationId, RowExclusiveLock);
18400 1188 : foreach(index, RelationGetIndexList(rel))
18401 : {
18402 724 : Oid thisIndexOid = lfirst_oid(index);
18403 724 : bool dirty = false;
18404 :
18405 724 : pg_index_tuple = SearchSysCacheCopy1(INDEXRELID,
18406 : ObjectIdGetDatum(thisIndexOid));
18407 724 : if (!HeapTupleIsValid(pg_index_tuple))
18408 0 : elog(ERROR, "cache lookup failed for index %u", thisIndexOid);
18409 724 : pg_index_form = (Form_pg_index) GETSTRUCT(pg_index_tuple);
18410 :
18411 724 : if (thisIndexOid == indexOid)
18412 : {
18413 : /* Set the bit if not already set. */
18414 240 : if (!pg_index_form->indisreplident)
18415 : {
18416 222 : dirty = true;
18417 222 : pg_index_form->indisreplident = true;
18418 : }
18419 : }
18420 : else
18421 : {
18422 : /* Unset the bit if set. */
18423 484 : if (pg_index_form->indisreplident)
18424 : {
18425 52 : dirty = true;
18426 52 : pg_index_form->indisreplident = false;
18427 : }
18428 : }
18429 :
18430 724 : if (dirty)
18431 : {
18432 274 : CatalogTupleUpdate(pg_index, &pg_index_tuple->t_self, pg_index_tuple);
18433 274 : InvokeObjectPostAlterHookArg(IndexRelationId, thisIndexOid, 0,
18434 : InvalidOid, is_internal);
18435 :
18436 : /*
18437 : * Invalidate the relcache for the table, so that after we commit
18438 : * all sessions will refresh the table's replica identity index
18439 : * before attempting any UPDATE or DELETE on the table. (If we
18440 : * changed the table's pg_class row above, then a relcache inval
18441 : * is already queued due to that; but we might not have.)
18442 : */
18443 274 : CacheInvalidateRelcache(rel);
18444 : }
18445 724 : heap_freetuple(pg_index_tuple);
18446 : }
18447 :
18448 464 : table_close(pg_index, RowExclusiveLock);
18449 464 : }
18450 :
18451 : /*
18452 : * ALTER TABLE <name> REPLICA IDENTITY ...
18453 : */
18454 : static void
18455 512 : ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode)
18456 : {
18457 : Oid indexOid;
18458 : Relation indexRel;
18459 : int key;
18460 :
18461 512 : if (stmt->identity_type == REPLICA_IDENTITY_DEFAULT)
18462 : {
18463 6 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18464 6 : return;
18465 : }
18466 506 : else if (stmt->identity_type == REPLICA_IDENTITY_FULL)
18467 : {
18468 170 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18469 170 : return;
18470 : }
18471 336 : else if (stmt->identity_type == REPLICA_IDENTITY_NOTHING)
18472 : {
18473 48 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18474 48 : return;
18475 : }
18476 288 : else if (stmt->identity_type == REPLICA_IDENTITY_INDEX)
18477 : {
18478 : /* fallthrough */ ;
18479 : }
18480 : else
18481 0 : elog(ERROR, "unexpected identity type %u", stmt->identity_type);
18482 :
18483 : /* Check that the index exists */
18484 288 : indexOid = get_relname_relid(stmt->name, rel->rd_rel->relnamespace);
18485 288 : if (!OidIsValid(indexOid))
18486 0 : ereport(ERROR,
18487 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18488 : errmsg("index \"%s\" for table \"%s\" does not exist",
18489 : stmt->name, RelationGetRelationName(rel))));
18490 :
18491 288 : indexRel = index_open(indexOid, ShareLock);
18492 :
18493 : /* Check that the index is on the relation we're altering. */
18494 288 : if (indexRel->rd_index == NULL ||
18495 288 : indexRel->rd_index->indrelid != RelationGetRelid(rel))
18496 6 : ereport(ERROR,
18497 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18498 : errmsg("\"%s\" is not an index for table \"%s\"",
18499 : RelationGetRelationName(indexRel),
18500 : RelationGetRelationName(rel))));
18501 :
18502 : /*
18503 : * The AM must support uniqueness, and the index must in fact be unique.
18504 : * If we have a WITHOUT OVERLAPS constraint (identified by uniqueness +
18505 : * exclusion), we can use that too.
18506 : */
18507 282 : if ((!indexRel->rd_indam->amcanunique ||
18508 262 : !indexRel->rd_index->indisunique) &&
18509 26 : !(indexRel->rd_index->indisunique && indexRel->rd_index->indisexclusion))
18510 12 : ereport(ERROR,
18511 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18512 : errmsg("cannot use non-unique index \"%s\" as replica identity",
18513 : RelationGetRelationName(indexRel))));
18514 : /* Deferred indexes are not guaranteed to be always unique. */
18515 270 : if (!indexRel->rd_index->indimmediate)
18516 12 : ereport(ERROR,
18517 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18518 : errmsg("cannot use non-immediate index \"%s\" as replica identity",
18519 : RelationGetRelationName(indexRel))));
18520 : /* Expression indexes aren't supported. */
18521 258 : if (RelationGetIndexExpressions(indexRel) != NIL)
18522 6 : ereport(ERROR,
18523 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18524 : errmsg("cannot use expression index \"%s\" as replica identity",
18525 : RelationGetRelationName(indexRel))));
18526 : /* Predicate indexes aren't supported. */
18527 252 : if (RelationGetIndexPredicate(indexRel) != NIL)
18528 6 : ereport(ERROR,
18529 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18530 : errmsg("cannot use partial index \"%s\" as replica identity",
18531 : RelationGetRelationName(indexRel))));
18532 :
18533 : /* Check index for nullable columns. */
18534 552 : for (key = 0; key < IndexRelationGetNumberOfKeyAttributes(indexRel); key++)
18535 : {
18536 312 : int16 attno = indexRel->rd_index->indkey.values[key];
18537 : Form_pg_attribute attr;
18538 :
18539 : /*
18540 : * Reject any other system columns. (Going forward, we'll disallow
18541 : * indexes containing such columns in the first place, but they might
18542 : * exist in older branches.)
18543 : */
18544 312 : if (attno <= 0)
18545 0 : ereport(ERROR,
18546 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
18547 : errmsg("index \"%s\" cannot be used as replica identity because column %d is a system column",
18548 : RelationGetRelationName(indexRel), attno)));
18549 :
18550 312 : attr = TupleDescAttr(rel->rd_att, attno - 1);
18551 312 : if (!attr->attnotnull)
18552 6 : ereport(ERROR,
18553 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18554 : errmsg("index \"%s\" cannot be used as replica identity because column \"%s\" is nullable",
18555 : RelationGetRelationName(indexRel),
18556 : NameStr(attr->attname))));
18557 : }
18558 :
18559 : /* This index is suitable for use as a replica identity. Mark it. */
18560 240 : relation_mark_replica_identity(rel, stmt->identity_type, indexOid, true);
18561 :
18562 240 : index_close(indexRel, NoLock);
18563 : }
18564 :
18565 : /*
18566 : * ALTER TABLE ENABLE/DISABLE ROW LEVEL SECURITY
18567 : */
18568 : static void
18569 348 : ATExecSetRowSecurity(Relation rel, bool rls)
18570 : {
18571 : Relation pg_class;
18572 : Oid relid;
18573 : HeapTuple tuple;
18574 :
18575 348 : relid = RelationGetRelid(rel);
18576 :
18577 : /* Pull the record for this relation and update it */
18578 348 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18579 :
18580 348 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18581 :
18582 348 : if (!HeapTupleIsValid(tuple))
18583 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18584 :
18585 348 : ((Form_pg_class) GETSTRUCT(tuple))->relrowsecurity = rls;
18586 348 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18587 :
18588 348 : InvokeObjectPostAlterHook(RelationRelationId,
18589 : RelationGetRelid(rel), 0);
18590 :
18591 348 : table_close(pg_class, RowExclusiveLock);
18592 348 : heap_freetuple(tuple);
18593 348 : }
18594 :
18595 : /*
18596 : * ALTER TABLE FORCE/NO FORCE ROW LEVEL SECURITY
18597 : */
18598 : static void
18599 132 : ATExecForceNoForceRowSecurity(Relation rel, bool force_rls)
18600 : {
18601 : Relation pg_class;
18602 : Oid relid;
18603 : HeapTuple tuple;
18604 :
18605 132 : relid = RelationGetRelid(rel);
18606 :
18607 132 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18608 :
18609 132 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18610 :
18611 132 : if (!HeapTupleIsValid(tuple))
18612 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18613 :
18614 132 : ((Form_pg_class) GETSTRUCT(tuple))->relforcerowsecurity = force_rls;
18615 132 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18616 :
18617 132 : InvokeObjectPostAlterHook(RelationRelationId,
18618 : RelationGetRelid(rel), 0);
18619 :
18620 132 : table_close(pg_class, RowExclusiveLock);
18621 132 : heap_freetuple(tuple);
18622 132 : }
18623 :
18624 : /*
18625 : * ALTER FOREIGN TABLE <name> OPTIONS (...)
18626 : */
18627 : static void
18628 58 : ATExecGenericOptions(Relation rel, List *options)
18629 : {
18630 : Relation ftrel;
18631 : ForeignServer *server;
18632 : ForeignDataWrapper *fdw;
18633 : HeapTuple tuple;
18634 : bool isnull;
18635 : Datum repl_val[Natts_pg_foreign_table];
18636 : bool repl_null[Natts_pg_foreign_table];
18637 : bool repl_repl[Natts_pg_foreign_table];
18638 : Datum datum;
18639 : Form_pg_foreign_table tableform;
18640 :
18641 58 : if (options == NIL)
18642 0 : return;
18643 :
18644 58 : ftrel = table_open(ForeignTableRelationId, RowExclusiveLock);
18645 :
18646 58 : tuple = SearchSysCacheCopy1(FOREIGNTABLEREL,
18647 : ObjectIdGetDatum(rel->rd_id));
18648 58 : if (!HeapTupleIsValid(tuple))
18649 0 : ereport(ERROR,
18650 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18651 : errmsg("foreign table \"%s\" does not exist",
18652 : RelationGetRelationName(rel))));
18653 58 : tableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
18654 58 : server = GetForeignServer(tableform->ftserver);
18655 58 : fdw = GetForeignDataWrapper(server->fdwid);
18656 :
18657 58 : memset(repl_val, 0, sizeof(repl_val));
18658 58 : memset(repl_null, false, sizeof(repl_null));
18659 58 : memset(repl_repl, false, sizeof(repl_repl));
18660 :
18661 : /* Extract the current options */
18662 58 : datum = SysCacheGetAttr(FOREIGNTABLEREL,
18663 : tuple,
18664 : Anum_pg_foreign_table_ftoptions,
18665 : &isnull);
18666 58 : if (isnull)
18667 4 : datum = PointerGetDatum(NULL);
18668 :
18669 : /* Transform the options */
18670 58 : datum = transformGenericOptions(ForeignTableRelationId,
18671 : datum,
18672 : options,
18673 : fdw->fdwvalidator);
18674 :
18675 56 : if (DatumGetPointer(datum) != NULL)
18676 56 : repl_val[Anum_pg_foreign_table_ftoptions - 1] = datum;
18677 : else
18678 0 : repl_null[Anum_pg_foreign_table_ftoptions - 1] = true;
18679 :
18680 56 : repl_repl[Anum_pg_foreign_table_ftoptions - 1] = true;
18681 :
18682 : /* Everything looks good - update the tuple */
18683 :
18684 56 : tuple = heap_modify_tuple(tuple, RelationGetDescr(ftrel),
18685 : repl_val, repl_null, repl_repl);
18686 :
18687 56 : CatalogTupleUpdate(ftrel, &tuple->t_self, tuple);
18688 :
18689 : /*
18690 : * Invalidate relcache so that all sessions will refresh any cached plans
18691 : * that might depend on the old options.
18692 : */
18693 56 : CacheInvalidateRelcache(rel);
18694 :
18695 56 : InvokeObjectPostAlterHook(ForeignTableRelationId,
18696 : RelationGetRelid(rel), 0);
18697 :
18698 56 : table_close(ftrel, RowExclusiveLock);
18699 :
18700 56 : heap_freetuple(tuple);
18701 : }
18702 :
18703 : /*
18704 : * ALTER TABLE ALTER COLUMN SET COMPRESSION
18705 : *
18706 : * Return value is the address of the modified column
18707 : */
18708 : static ObjectAddress
18709 78 : ATExecSetCompression(Relation rel,
18710 : const char *column,
18711 : Node *newValue,
18712 : LOCKMODE lockmode)
18713 : {
18714 : Relation attrel;
18715 : HeapTuple tuple;
18716 : Form_pg_attribute atttableform;
18717 : AttrNumber attnum;
18718 : char *compression;
18719 : char cmethod;
18720 : ObjectAddress address;
18721 :
18722 78 : compression = strVal(newValue);
18723 :
18724 78 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
18725 :
18726 : /* copy the cache entry so we can scribble on it below */
18727 78 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), column);
18728 78 : if (!HeapTupleIsValid(tuple))
18729 0 : ereport(ERROR,
18730 : (errcode(ERRCODE_UNDEFINED_COLUMN),
18731 : errmsg("column \"%s\" of relation \"%s\" does not exist",
18732 : column, RelationGetRelationName(rel))));
18733 :
18734 : /* prevent them from altering a system attribute */
18735 78 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
18736 78 : attnum = atttableform->attnum;
18737 78 : if (attnum <= 0)
18738 0 : ereport(ERROR,
18739 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18740 : errmsg("cannot alter system column \"%s\"", column)));
18741 :
18742 : /*
18743 : * Check that column type is compressible, then get the attribute
18744 : * compression method code
18745 : */
18746 78 : cmethod = GetAttributeCompression(atttableform->atttypid, compression);
18747 :
18748 : /* update pg_attribute entry */
18749 72 : atttableform->attcompression = cmethod;
18750 72 : CatalogTupleUpdate(attrel, &tuple->t_self, tuple);
18751 :
18752 72 : InvokeObjectPostAlterHook(RelationRelationId,
18753 : RelationGetRelid(rel),
18754 : attnum);
18755 :
18756 : /*
18757 : * Apply the change to indexes as well (only for simple index columns,
18758 : * matching behavior of index.c ConstructTupleDescriptor()).
18759 : */
18760 72 : SetIndexStorageProperties(rel, attrel, attnum,
18761 : false, 0,
18762 : true, cmethod,
18763 : lockmode);
18764 :
18765 72 : heap_freetuple(tuple);
18766 :
18767 72 : table_close(attrel, RowExclusiveLock);
18768 :
18769 : /* make changes visible */
18770 72 : CommandCounterIncrement();
18771 :
18772 72 : ObjectAddressSubSet(address, RelationRelationId,
18773 : RelationGetRelid(rel), attnum);
18774 72 : return address;
18775 : }
18776 :
18777 :
18778 : /*
18779 : * Preparation phase for SET LOGGED/UNLOGGED
18780 : *
18781 : * This verifies that we're not trying to change a temp table. Also,
18782 : * existing foreign key constraints are checked to avoid ending up with
18783 : * permanent tables referencing unlogged tables.
18784 : */
18785 : static void
18786 100 : ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel, bool toLogged)
18787 : {
18788 : Relation pg_constraint;
18789 : HeapTuple tuple;
18790 : SysScanDesc scan;
18791 : ScanKeyData skey[1];
18792 :
18793 : /*
18794 : * Disallow changing status for a temp table. Also verify whether we can
18795 : * get away with doing nothing; in such cases we don't need to run the
18796 : * checks below, either.
18797 : */
18798 100 : switch (rel->rd_rel->relpersistence)
18799 : {
18800 0 : case RELPERSISTENCE_TEMP:
18801 0 : ereport(ERROR,
18802 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18803 : errmsg("cannot change logged status of table \"%s\" because it is temporary",
18804 : RelationGetRelationName(rel)),
18805 : errtable(rel)));
18806 : break;
18807 56 : case RELPERSISTENCE_PERMANENT:
18808 56 : if (toLogged)
18809 : /* nothing to do */
18810 12 : return;
18811 50 : break;
18812 44 : case RELPERSISTENCE_UNLOGGED:
18813 44 : if (!toLogged)
18814 : /* nothing to do */
18815 6 : return;
18816 38 : break;
18817 : }
18818 :
18819 : /*
18820 : * Check that the table is not part of any publication when changing to
18821 : * UNLOGGED, as UNLOGGED tables can't be published.
18822 : */
18823 138 : if (!toLogged &&
18824 50 : GetRelationPublications(RelationGetRelid(rel)) != NIL)
18825 0 : ereport(ERROR,
18826 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
18827 : errmsg("cannot change table \"%s\" to unlogged because it is part of a publication",
18828 : RelationGetRelationName(rel)),
18829 : errdetail("Unlogged relations cannot be replicated.")));
18830 :
18831 : /*
18832 : * Check existing foreign key constraints to preserve the invariant that
18833 : * permanent tables cannot reference unlogged ones. Self-referencing
18834 : * foreign keys can safely be ignored.
18835 : */
18836 88 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
18837 :
18838 : /*
18839 : * Scan conrelid if changing to permanent, else confrelid. This also
18840 : * determines whether a useful index exists.
18841 : */
18842 88 : ScanKeyInit(&skey[0],
18843 : toLogged ? Anum_pg_constraint_conrelid :
18844 : Anum_pg_constraint_confrelid,
18845 : BTEqualStrategyNumber, F_OIDEQ,
18846 : ObjectIdGetDatum(RelationGetRelid(rel)));
18847 88 : scan = systable_beginscan(pg_constraint,
18848 : toLogged ? ConstraintRelidTypidNameIndexId : InvalidOid,
18849 : true, NULL, 1, skey);
18850 :
18851 142 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
18852 : {
18853 66 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
18854 :
18855 66 : if (con->contype == CONSTRAINT_FOREIGN)
18856 : {
18857 : Oid foreignrelid;
18858 : Relation foreignrel;
18859 :
18860 : /* the opposite end of what we used as scankey */
18861 30 : foreignrelid = toLogged ? con->confrelid : con->conrelid;
18862 :
18863 : /* ignore if self-referencing */
18864 30 : if (RelationGetRelid(rel) == foreignrelid)
18865 12 : continue;
18866 :
18867 18 : foreignrel = relation_open(foreignrelid, AccessShareLock);
18868 :
18869 18 : if (toLogged)
18870 : {
18871 6 : if (!RelationIsPermanent(foreignrel))
18872 6 : ereport(ERROR,
18873 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18874 : errmsg("could not change table \"%s\" to logged because it references unlogged table \"%s\"",
18875 : RelationGetRelationName(rel),
18876 : RelationGetRelationName(foreignrel)),
18877 : errtableconstraint(rel, NameStr(con->conname))));
18878 : }
18879 : else
18880 : {
18881 12 : if (RelationIsPermanent(foreignrel))
18882 6 : ereport(ERROR,
18883 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18884 : errmsg("could not change table \"%s\" to unlogged because it references logged table \"%s\"",
18885 : RelationGetRelationName(rel),
18886 : RelationGetRelationName(foreignrel)),
18887 : errtableconstraint(rel, NameStr(con->conname))));
18888 : }
18889 :
18890 6 : relation_close(foreignrel, AccessShareLock);
18891 : }
18892 : }
18893 :
18894 76 : systable_endscan(scan);
18895 :
18896 76 : table_close(pg_constraint, AccessShareLock);
18897 :
18898 : /* force rewrite if necessary; see comment in ATRewriteTables */
18899 76 : tab->rewrite |= AT_REWRITE_ALTER_PERSISTENCE;
18900 76 : if (toLogged)
18901 32 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
18902 : else
18903 44 : tab->newrelpersistence = RELPERSISTENCE_UNLOGGED;
18904 76 : tab->chgPersistence = true;
18905 : }
18906 :
18907 : /*
18908 : * Execute ALTER TABLE SET SCHEMA
18909 : */
18910 : ObjectAddress
18911 104 : AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
18912 : {
18913 : Relation rel;
18914 : Oid relid;
18915 : Oid oldNspOid;
18916 : Oid nspOid;
18917 : RangeVar *newrv;
18918 : ObjectAddresses *objsMoved;
18919 : ObjectAddress myself;
18920 :
18921 104 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
18922 104 : stmt->missing_ok ? RVR_MISSING_OK : 0,
18923 : RangeVarCallbackForAlterRelation,
18924 : stmt);
18925 :
18926 102 : if (!OidIsValid(relid))
18927 : {
18928 12 : ereport(NOTICE,
18929 : (errmsg("relation \"%s\" does not exist, skipping",
18930 : stmt->relation->relname)));
18931 12 : return InvalidObjectAddress;
18932 : }
18933 :
18934 90 : rel = relation_open(relid, NoLock);
18935 :
18936 90 : oldNspOid = RelationGetNamespace(rel);
18937 :
18938 : /* If it's an owned sequence, disallow moving it by itself. */
18939 90 : if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
18940 : {
18941 : Oid tableId;
18942 : int32 colId;
18943 :
18944 10 : if (sequenceIsOwned(relid, DEPENDENCY_AUTO, &tableId, &colId) ||
18945 2 : sequenceIsOwned(relid, DEPENDENCY_INTERNAL, &tableId, &colId))
18946 6 : ereport(ERROR,
18947 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18948 : errmsg("cannot move an owned sequence into another schema"),
18949 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
18950 : RelationGetRelationName(rel),
18951 : get_rel_name(tableId))));
18952 : }
18953 :
18954 : /* Get and lock schema OID and check its permissions. */
18955 84 : newrv = makeRangeVar(stmt->newschema, RelationGetRelationName(rel), -1);
18956 84 : nspOid = RangeVarGetAndCheckCreationNamespace(newrv, NoLock, NULL);
18957 :
18958 : /* common checks on switching namespaces */
18959 84 : CheckSetNamespace(oldNspOid, nspOid);
18960 :
18961 84 : objsMoved = new_object_addresses();
18962 84 : AlterTableNamespaceInternal(rel, oldNspOid, nspOid, objsMoved);
18963 84 : free_object_addresses(objsMoved);
18964 :
18965 84 : ObjectAddressSet(myself, RelationRelationId, relid);
18966 :
18967 84 : if (oldschema)
18968 84 : *oldschema = oldNspOid;
18969 :
18970 : /* close rel, but keep lock until commit */
18971 84 : relation_close(rel, NoLock);
18972 :
18973 84 : return myself;
18974 : }
18975 :
18976 : /*
18977 : * The guts of relocating a table or materialized view to another namespace:
18978 : * besides moving the relation itself, its dependent objects are relocated to
18979 : * the new schema.
18980 : */
18981 : void
18982 86 : AlterTableNamespaceInternal(Relation rel, Oid oldNspOid, Oid nspOid,
18983 : ObjectAddresses *objsMoved)
18984 : {
18985 : Relation classRel;
18986 :
18987 : Assert(objsMoved != NULL);
18988 :
18989 : /* OK, modify the pg_class row and pg_depend entry */
18990 86 : classRel = table_open(RelationRelationId, RowExclusiveLock);
18991 :
18992 86 : AlterRelationNamespaceInternal(classRel, RelationGetRelid(rel), oldNspOid,
18993 : nspOid, true, objsMoved);
18994 :
18995 : /* Fix the table's row type too, if it has one */
18996 86 : if (OidIsValid(rel->rd_rel->reltype))
18997 84 : AlterTypeNamespaceInternal(rel->rd_rel->reltype, nspOid,
18998 : false, /* isImplicitArray */
18999 : false, /* ignoreDependent */
19000 : false, /* errorOnTableType */
19001 : objsMoved);
19002 :
19003 : /* Fix other dependent stuff */
19004 86 : AlterIndexNamespaces(classRel, rel, oldNspOid, nspOid, objsMoved);
19005 86 : AlterSeqNamespaces(classRel, rel, oldNspOid, nspOid,
19006 : objsMoved, AccessExclusiveLock);
19007 86 : AlterConstraintNamespaces(RelationGetRelid(rel), oldNspOid, nspOid,
19008 : false, objsMoved);
19009 :
19010 86 : table_close(classRel, RowExclusiveLock);
19011 86 : }
19012 :
19013 : /*
19014 : * The guts of relocating a relation to another namespace: fix the pg_class
19015 : * entry, and the pg_depend entry if any. Caller must already have
19016 : * opened and write-locked pg_class.
19017 : */
19018 : void
19019 188 : AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
19020 : Oid oldNspOid, Oid newNspOid,
19021 : bool hasDependEntry,
19022 : ObjectAddresses *objsMoved)
19023 : {
19024 : HeapTuple classTup;
19025 : Form_pg_class classForm;
19026 : ObjectAddress thisobj;
19027 188 : bool already_done = false;
19028 :
19029 : /* no rel lock for relkind=c so use LOCKTAG_TUPLE */
19030 188 : classTup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(relOid));
19031 188 : if (!HeapTupleIsValid(classTup))
19032 0 : elog(ERROR, "cache lookup failed for relation %u", relOid);
19033 188 : classForm = (Form_pg_class) GETSTRUCT(classTup);
19034 :
19035 : Assert(classForm->relnamespace == oldNspOid);
19036 :
19037 188 : thisobj.classId = RelationRelationId;
19038 188 : thisobj.objectId = relOid;
19039 188 : thisobj.objectSubId = 0;
19040 :
19041 : /*
19042 : * If the object has already been moved, don't move it again. If it's
19043 : * already in the right place, don't move it, but still fire the object
19044 : * access hook.
19045 : */
19046 188 : already_done = object_address_present(&thisobj, objsMoved);
19047 188 : if (!already_done && oldNspOid != newNspOid)
19048 146 : {
19049 146 : ItemPointerData otid = classTup->t_self;
19050 :
19051 : /* check for duplicate name (more friendly than unique-index failure) */
19052 146 : if (get_relname_relid(NameStr(classForm->relname),
19053 : newNspOid) != InvalidOid)
19054 0 : ereport(ERROR,
19055 : (errcode(ERRCODE_DUPLICATE_TABLE),
19056 : errmsg("relation \"%s\" already exists in schema \"%s\"",
19057 : NameStr(classForm->relname),
19058 : get_namespace_name(newNspOid))));
19059 :
19060 : /* classTup is a copy, so OK to scribble on */
19061 146 : classForm->relnamespace = newNspOid;
19062 :
19063 146 : CatalogTupleUpdate(classRel, &otid, classTup);
19064 146 : UnlockTuple(classRel, &otid, InplaceUpdateTupleLock);
19065 :
19066 :
19067 : /* Update dependency on schema if caller said so */
19068 250 : if (hasDependEntry &&
19069 104 : changeDependencyFor(RelationRelationId,
19070 : relOid,
19071 : NamespaceRelationId,
19072 : oldNspOid,
19073 : newNspOid) != 1)
19074 0 : elog(ERROR, "could not change schema dependency for relation \"%s\"",
19075 : NameStr(classForm->relname));
19076 : }
19077 : else
19078 42 : UnlockTuple(classRel, &classTup->t_self, InplaceUpdateTupleLock);
19079 188 : if (!already_done)
19080 : {
19081 188 : add_exact_object_address(&thisobj, objsMoved);
19082 :
19083 188 : InvokeObjectPostAlterHook(RelationRelationId, relOid, 0);
19084 : }
19085 :
19086 188 : heap_freetuple(classTup);
19087 188 : }
19088 :
19089 : /*
19090 : * Move all indexes for the specified relation to another namespace.
19091 : *
19092 : * Note: we assume adequate permission checking was done by the caller,
19093 : * and that the caller has a suitable lock on the owning relation.
19094 : */
19095 : static void
19096 86 : AlterIndexNamespaces(Relation classRel, Relation rel,
19097 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved)
19098 : {
19099 : List *indexList;
19100 : ListCell *l;
19101 :
19102 86 : indexList = RelationGetIndexList(rel);
19103 :
19104 132 : foreach(l, indexList)
19105 : {
19106 46 : Oid indexOid = lfirst_oid(l);
19107 : ObjectAddress thisobj;
19108 :
19109 46 : thisobj.classId = RelationRelationId;
19110 46 : thisobj.objectId = indexOid;
19111 46 : thisobj.objectSubId = 0;
19112 :
19113 : /*
19114 : * Note: currently, the index will not have its own dependency on the
19115 : * namespace, so we don't need to do changeDependencyFor(). There's no
19116 : * row type in pg_type, either.
19117 : *
19118 : * XXX this objsMoved test may be pointless -- surely we have a single
19119 : * dependency link from a relation to each index?
19120 : */
19121 46 : if (!object_address_present(&thisobj, objsMoved))
19122 : {
19123 46 : AlterRelationNamespaceInternal(classRel, indexOid,
19124 : oldNspOid, newNspOid,
19125 : false, objsMoved);
19126 46 : add_exact_object_address(&thisobj, objsMoved);
19127 : }
19128 : }
19129 :
19130 86 : list_free(indexList);
19131 86 : }
19132 :
19133 : /*
19134 : * Move all identity and SERIAL-column sequences of the specified relation to another
19135 : * namespace.
19136 : *
19137 : * Note: we assume adequate permission checking was done by the caller,
19138 : * and that the caller has a suitable lock on the owning relation.
19139 : */
19140 : static void
19141 86 : AlterSeqNamespaces(Relation classRel, Relation rel,
19142 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
19143 : LOCKMODE lockmode)
19144 : {
19145 : Relation depRel;
19146 : SysScanDesc scan;
19147 : ScanKeyData key[2];
19148 : HeapTuple tup;
19149 :
19150 : /*
19151 : * SERIAL sequences are those having an auto dependency on one of the
19152 : * table's columns (we don't care *which* column, exactly).
19153 : */
19154 86 : depRel = table_open(DependRelationId, AccessShareLock);
19155 :
19156 86 : ScanKeyInit(&key[0],
19157 : Anum_pg_depend_refclassid,
19158 : BTEqualStrategyNumber, F_OIDEQ,
19159 : ObjectIdGetDatum(RelationRelationId));
19160 86 : ScanKeyInit(&key[1],
19161 : Anum_pg_depend_refobjid,
19162 : BTEqualStrategyNumber, F_OIDEQ,
19163 : ObjectIdGetDatum(RelationGetRelid(rel)));
19164 : /* we leave refobjsubid unspecified */
19165 :
19166 86 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
19167 : NULL, 2, key);
19168 :
19169 616 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
19170 : {
19171 530 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
19172 : Relation seqRel;
19173 :
19174 : /* skip dependencies other than auto dependencies on columns */
19175 530 : if (depForm->refobjsubid == 0 ||
19176 382 : depForm->classid != RelationRelationId ||
19177 42 : depForm->objsubid != 0 ||
19178 42 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
19179 488 : continue;
19180 :
19181 : /* Use relation_open just in case it's an index */
19182 42 : seqRel = relation_open(depForm->objid, lockmode);
19183 :
19184 : /* skip non-sequence relations */
19185 42 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
19186 : {
19187 : /* No need to keep the lock */
19188 0 : relation_close(seqRel, lockmode);
19189 0 : continue;
19190 : }
19191 :
19192 : /* Fix the pg_class and pg_depend entries */
19193 42 : AlterRelationNamespaceInternal(classRel, depForm->objid,
19194 : oldNspOid, newNspOid,
19195 : true, objsMoved);
19196 :
19197 : /*
19198 : * Sequences used to have entries in pg_type, but no longer do. If we
19199 : * ever re-instate that, we'll need to move the pg_type entry to the
19200 : * new namespace, too (using AlterTypeNamespaceInternal).
19201 : */
19202 : Assert(RelationGetForm(seqRel)->reltype == InvalidOid);
19203 :
19204 : /* Now we can close it. Keep the lock till end of transaction. */
19205 42 : relation_close(seqRel, NoLock);
19206 : }
19207 :
19208 86 : systable_endscan(scan);
19209 :
19210 86 : relation_close(depRel, AccessShareLock);
19211 86 : }
19212 :
19213 :
19214 : /*
19215 : * This code supports
19216 : * CREATE TEMP TABLE ... ON COMMIT { DROP | PRESERVE ROWS | DELETE ROWS }
19217 : *
19218 : * Because we only support this for TEMP tables, it's sufficient to remember
19219 : * the state in a backend-local data structure.
19220 : */
19221 :
19222 : /*
19223 : * Register a newly-created relation's ON COMMIT action.
19224 : */
19225 : void
19226 176 : register_on_commit_action(Oid relid, OnCommitAction action)
19227 : {
19228 : OnCommitItem *oc;
19229 : MemoryContext oldcxt;
19230 :
19231 : /*
19232 : * We needn't bother registering the relation unless there is an ON COMMIT
19233 : * action we need to take.
19234 : */
19235 176 : if (action == ONCOMMIT_NOOP || action == ONCOMMIT_PRESERVE_ROWS)
19236 24 : return;
19237 :
19238 152 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
19239 :
19240 152 : oc = (OnCommitItem *) palloc(sizeof(OnCommitItem));
19241 152 : oc->relid = relid;
19242 152 : oc->oncommit = action;
19243 152 : oc->creating_subid = GetCurrentSubTransactionId();
19244 152 : oc->deleting_subid = InvalidSubTransactionId;
19245 :
19246 : /*
19247 : * We use lcons() here so that ON COMMIT actions are processed in reverse
19248 : * order of registration. That might not be essential but it seems
19249 : * reasonable.
19250 : */
19251 152 : on_commits = lcons(oc, on_commits);
19252 :
19253 152 : MemoryContextSwitchTo(oldcxt);
19254 : }
19255 :
19256 : /*
19257 : * Unregister any ON COMMIT action when a relation is deleted.
19258 : *
19259 : * Actually, we only mark the OnCommitItem entry as to be deleted after commit.
19260 : */
19261 : void
19262 48930 : remove_on_commit_action(Oid relid)
19263 : {
19264 : ListCell *l;
19265 :
19266 49076 : foreach(l, on_commits)
19267 : {
19268 286 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19269 :
19270 286 : if (oc->relid == relid)
19271 : {
19272 140 : oc->deleting_subid = GetCurrentSubTransactionId();
19273 140 : break;
19274 : }
19275 : }
19276 48930 : }
19277 :
19278 : /*
19279 : * Perform ON COMMIT actions.
19280 : *
19281 : * This is invoked just before actually committing, since it's possible
19282 : * to encounter errors.
19283 : */
19284 : void
19285 1105960 : PreCommit_on_commit_actions(void)
19286 : {
19287 : ListCell *l;
19288 1105960 : List *oids_to_truncate = NIL;
19289 1105960 : List *oids_to_drop = NIL;
19290 :
19291 1106782 : foreach(l, on_commits)
19292 : {
19293 822 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19294 :
19295 : /* Ignore entry if already dropped in this xact */
19296 822 : if (oc->deleting_subid != InvalidSubTransactionId)
19297 74 : continue;
19298 :
19299 748 : switch (oc->oncommit)
19300 : {
19301 0 : case ONCOMMIT_NOOP:
19302 : case ONCOMMIT_PRESERVE_ROWS:
19303 : /* Do nothing (there shouldn't be such entries, actually) */
19304 0 : break;
19305 694 : case ONCOMMIT_DELETE_ROWS:
19306 :
19307 : /*
19308 : * If this transaction hasn't accessed any temporary
19309 : * relations, we can skip truncating ON COMMIT DELETE ROWS
19310 : * tables, as they must still be empty.
19311 : */
19312 694 : if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
19313 448 : oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
19314 694 : break;
19315 54 : case ONCOMMIT_DROP:
19316 54 : oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
19317 54 : break;
19318 : }
19319 : }
19320 :
19321 : /*
19322 : * Truncate relations before dropping so that all dependencies between
19323 : * relations are removed after they are worked on. Doing it like this
19324 : * might be a waste as it is possible that a relation being truncated will
19325 : * be dropped anyway due to its parent being dropped, but this makes the
19326 : * code more robust because of not having to re-check that the relation
19327 : * exists at truncation time.
19328 : */
19329 1105960 : if (oids_to_truncate != NIL)
19330 382 : heap_truncate(oids_to_truncate);
19331 :
19332 1105954 : if (oids_to_drop != NIL)
19333 : {
19334 48 : ObjectAddresses *targetObjects = new_object_addresses();
19335 :
19336 102 : foreach(l, oids_to_drop)
19337 : {
19338 : ObjectAddress object;
19339 :
19340 54 : object.classId = RelationRelationId;
19341 54 : object.objectId = lfirst_oid(l);
19342 54 : object.objectSubId = 0;
19343 :
19344 : Assert(!object_address_present(&object, targetObjects));
19345 :
19346 54 : add_exact_object_address(&object, targetObjects);
19347 : }
19348 :
19349 : /*
19350 : * Object deletion might involve toast table access (to clean up
19351 : * toasted catalog entries), so ensure we have a valid snapshot.
19352 : */
19353 48 : PushActiveSnapshot(GetTransactionSnapshot());
19354 :
19355 : /*
19356 : * Since this is an automatic drop, rather than one directly initiated
19357 : * by the user, we pass the PERFORM_DELETION_INTERNAL flag.
19358 : */
19359 48 : performMultipleDeletions(targetObjects, DROP_CASCADE,
19360 : PERFORM_DELETION_INTERNAL | PERFORM_DELETION_QUIETLY);
19361 :
19362 48 : PopActiveSnapshot();
19363 :
19364 : #ifdef USE_ASSERT_CHECKING
19365 :
19366 : /*
19367 : * Note that table deletion will call remove_on_commit_action, so the
19368 : * entry should get marked as deleted.
19369 : */
19370 : foreach(l, on_commits)
19371 : {
19372 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19373 :
19374 : if (oc->oncommit != ONCOMMIT_DROP)
19375 : continue;
19376 :
19377 : Assert(oc->deleting_subid != InvalidSubTransactionId);
19378 : }
19379 : #endif
19380 : }
19381 1105954 : }
19382 :
19383 : /*
19384 : * Post-commit or post-abort cleanup for ON COMMIT management.
19385 : *
19386 : * All we do here is remove no-longer-needed OnCommitItem entries.
19387 : *
19388 : * During commit, remove entries that were deleted during this transaction;
19389 : * during abort, remove those created during this transaction.
19390 : */
19391 : void
19392 1155650 : AtEOXact_on_commit_actions(bool isCommit)
19393 : {
19394 : ListCell *cur_item;
19395 :
19396 1156502 : foreach(cur_item, on_commits)
19397 : {
19398 852 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19399 :
19400 954 : if (isCommit ? oc->deleting_subid != InvalidSubTransactionId :
19401 102 : oc->creating_subid != InvalidSubTransactionId)
19402 : {
19403 : /* cur_item must be removed */
19404 152 : on_commits = foreach_delete_current(on_commits, cur_item);
19405 152 : pfree(oc);
19406 : }
19407 : else
19408 : {
19409 : /* cur_item must be preserved */
19410 700 : oc->creating_subid = InvalidSubTransactionId;
19411 700 : oc->deleting_subid = InvalidSubTransactionId;
19412 : }
19413 : }
19414 1155650 : }
19415 :
19416 : /*
19417 : * Post-subcommit or post-subabort cleanup for ON COMMIT management.
19418 : *
19419 : * During subabort, we can immediately remove entries created during this
19420 : * subtransaction. During subcommit, just relabel entries marked during
19421 : * this subtransaction as being the parent's responsibility.
19422 : */
19423 : void
19424 20100 : AtEOSubXact_on_commit_actions(bool isCommit, SubTransactionId mySubid,
19425 : SubTransactionId parentSubid)
19426 : {
19427 : ListCell *cur_item;
19428 :
19429 20100 : foreach(cur_item, on_commits)
19430 : {
19431 0 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19432 :
19433 0 : if (!isCommit && oc->creating_subid == mySubid)
19434 : {
19435 : /* cur_item must be removed */
19436 0 : on_commits = foreach_delete_current(on_commits, cur_item);
19437 0 : pfree(oc);
19438 : }
19439 : else
19440 : {
19441 : /* cur_item must be preserved */
19442 0 : if (oc->creating_subid == mySubid)
19443 0 : oc->creating_subid = parentSubid;
19444 0 : if (oc->deleting_subid == mySubid)
19445 0 : oc->deleting_subid = isCommit ? parentSubid : InvalidSubTransactionId;
19446 : }
19447 : }
19448 20100 : }
19449 :
19450 : /*
19451 : * This is intended as a callback for RangeVarGetRelidExtended(). It allows
19452 : * the relation to be locked only if (1) it's a plain or partitioned table,
19453 : * materialized view, or TOAST table and (2) the current user is the owner (or
19454 : * the superuser) or has been granted MAINTAIN. This meets the
19455 : * permission-checking needs of CLUSTER, REINDEX TABLE, and REFRESH
19456 : * MATERIALIZED VIEW; we expose it here so that it can be used by all.
19457 : */
19458 : void
19459 1012 : RangeVarCallbackMaintainsTable(const RangeVar *relation,
19460 : Oid relId, Oid oldRelId, void *arg)
19461 : {
19462 : char relkind;
19463 : AclResult aclresult;
19464 :
19465 : /* Nothing to do if the relation was not found. */
19466 1012 : if (!OidIsValid(relId))
19467 6 : return;
19468 :
19469 : /*
19470 : * If the relation does exist, check whether it's an index. But note that
19471 : * the relation might have been dropped between the time we did the name
19472 : * lookup and now. In that case, there's nothing to do.
19473 : */
19474 1006 : relkind = get_rel_relkind(relId);
19475 1006 : if (!relkind)
19476 0 : return;
19477 1006 : if (relkind != RELKIND_RELATION && relkind != RELKIND_TOASTVALUE &&
19478 138 : relkind != RELKIND_MATVIEW && relkind != RELKIND_PARTITIONED_TABLE)
19479 28 : ereport(ERROR,
19480 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19481 : errmsg("\"%s\" is not a table or materialized view", relation->relname)));
19482 :
19483 : /* Check permissions */
19484 978 : aclresult = pg_class_aclcheck(relId, GetUserId(), ACL_MAINTAIN);
19485 978 : if (aclresult != ACLCHECK_OK)
19486 30 : aclcheck_error(aclresult,
19487 30 : get_relkind_objtype(get_rel_relkind(relId)),
19488 30 : relation->relname);
19489 : }
19490 :
19491 : /*
19492 : * Callback to RangeVarGetRelidExtended() for TRUNCATE processing.
19493 : */
19494 : static void
19495 2166 : RangeVarCallbackForTruncate(const RangeVar *relation,
19496 : Oid relId, Oid oldRelId, void *arg)
19497 : {
19498 : HeapTuple tuple;
19499 :
19500 : /* Nothing to do if the relation was not found. */
19501 2166 : if (!OidIsValid(relId))
19502 0 : return;
19503 :
19504 2166 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19505 2166 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19506 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19507 :
19508 2166 : truncate_check_rel(relId, (Form_pg_class) GETSTRUCT(tuple));
19509 2160 : truncate_check_perms(relId, (Form_pg_class) GETSTRUCT(tuple));
19510 :
19511 2128 : ReleaseSysCache(tuple);
19512 : }
19513 :
19514 : /*
19515 : * Callback for RangeVarGetRelidExtended(). Checks that the current user is
19516 : * the owner of the relation, or superuser.
19517 : */
19518 : void
19519 15958 : RangeVarCallbackOwnsRelation(const RangeVar *relation,
19520 : Oid relId, Oid oldRelId, void *arg)
19521 : {
19522 : HeapTuple tuple;
19523 :
19524 : /* Nothing to do if the relation was not found. */
19525 15958 : if (!OidIsValid(relId))
19526 8 : return;
19527 :
19528 15950 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19529 15950 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19530 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19531 :
19532 15950 : if (!object_ownercheck(RelationRelationId, relId, GetUserId()))
19533 6 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relId)),
19534 6 : relation->relname);
19535 :
19536 31768 : if (!allowSystemTableMods &&
19537 15824 : IsSystemClass(relId, (Form_pg_class) GETSTRUCT(tuple)))
19538 2 : ereport(ERROR,
19539 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19540 : errmsg("permission denied: \"%s\" is a system catalog",
19541 : relation->relname)));
19542 :
19543 15942 : ReleaseSysCache(tuple);
19544 : }
19545 :
19546 : /*
19547 : * Common RangeVarGetRelid callback for rename, set schema, and alter table
19548 : * processing.
19549 : */
19550 : static void
19551 33706 : RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid, Oid oldrelid,
19552 : void *arg)
19553 : {
19554 33706 : Node *stmt = (Node *) arg;
19555 : ObjectType reltype;
19556 : HeapTuple tuple;
19557 : Form_pg_class classform;
19558 : AclResult aclresult;
19559 : char relkind;
19560 :
19561 33706 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
19562 33706 : if (!HeapTupleIsValid(tuple))
19563 216 : return; /* concurrently dropped */
19564 33490 : classform = (Form_pg_class) GETSTRUCT(tuple);
19565 33490 : relkind = classform->relkind;
19566 :
19567 : /* Must own relation. */
19568 33490 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
19569 60 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
19570 :
19571 : /* No system table modifications unless explicitly allowed. */
19572 33430 : if (!allowSystemTableMods && IsSystemClass(relid, classform))
19573 30 : ereport(ERROR,
19574 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19575 : errmsg("permission denied: \"%s\" is a system catalog",
19576 : rv->relname)));
19577 :
19578 : /*
19579 : * Extract the specified relation type from the statement parse tree.
19580 : *
19581 : * Also, for ALTER .. RENAME, check permissions: the user must (still)
19582 : * have CREATE rights on the containing namespace.
19583 : */
19584 33400 : if (IsA(stmt, RenameStmt))
19585 : {
19586 490 : aclresult = object_aclcheck(NamespaceRelationId, classform->relnamespace,
19587 : GetUserId(), ACL_CREATE);
19588 490 : if (aclresult != ACLCHECK_OK)
19589 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
19590 0 : get_namespace_name(classform->relnamespace));
19591 490 : reltype = ((RenameStmt *) stmt)->renameType;
19592 : }
19593 32910 : else if (IsA(stmt, AlterObjectSchemaStmt))
19594 90 : reltype = ((AlterObjectSchemaStmt *) stmt)->objectType;
19595 :
19596 32820 : else if (IsA(stmt, AlterTableStmt))
19597 32820 : reltype = ((AlterTableStmt *) stmt)->objtype;
19598 : else
19599 : {
19600 0 : elog(ERROR, "unrecognized node type: %d", (int) nodeTag(stmt));
19601 : reltype = OBJECT_TABLE; /* placate compiler */
19602 : }
19603 :
19604 : /*
19605 : * For compatibility with prior releases, we allow ALTER TABLE to be used
19606 : * with most other types of relations (but not composite types). We allow
19607 : * similar flexibility for ALTER INDEX in the case of RENAME, but not
19608 : * otherwise. Otherwise, the user must select the correct form of the
19609 : * command for the relation at issue.
19610 : */
19611 33400 : if (reltype == OBJECT_SEQUENCE && relkind != RELKIND_SEQUENCE)
19612 0 : ereport(ERROR,
19613 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19614 : errmsg("\"%s\" is not a sequence", rv->relname)));
19615 :
19616 33400 : if (reltype == OBJECT_VIEW && relkind != RELKIND_VIEW)
19617 0 : ereport(ERROR,
19618 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19619 : errmsg("\"%s\" is not a view", rv->relname)));
19620 :
19621 33400 : if (reltype == OBJECT_MATVIEW && relkind != RELKIND_MATVIEW)
19622 0 : ereport(ERROR,
19623 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19624 : errmsg("\"%s\" is not a materialized view", rv->relname)));
19625 :
19626 33400 : if (reltype == OBJECT_FOREIGN_TABLE && relkind != RELKIND_FOREIGN_TABLE)
19627 0 : ereport(ERROR,
19628 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19629 : errmsg("\"%s\" is not a foreign table", rv->relname)));
19630 :
19631 33400 : if (reltype == OBJECT_TYPE && relkind != RELKIND_COMPOSITE_TYPE)
19632 0 : ereport(ERROR,
19633 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19634 : errmsg("\"%s\" is not a composite type", rv->relname)));
19635 :
19636 33400 : if (reltype == OBJECT_INDEX && relkind != RELKIND_INDEX &&
19637 : relkind != RELKIND_PARTITIONED_INDEX
19638 36 : && !IsA(stmt, RenameStmt))
19639 6 : ereport(ERROR,
19640 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19641 : errmsg("\"%s\" is not an index", rv->relname)));
19642 :
19643 : /*
19644 : * Don't allow ALTER TABLE on composite types. We want people to use ALTER
19645 : * TYPE for that.
19646 : */
19647 33394 : if (reltype != OBJECT_TYPE && relkind == RELKIND_COMPOSITE_TYPE)
19648 0 : ereport(ERROR,
19649 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19650 : errmsg("\"%s\" is a composite type", rv->relname),
19651 : /* translator: %s is an SQL ALTER command */
19652 : errhint("Use %s instead.",
19653 : "ALTER TYPE")));
19654 :
19655 : /*
19656 : * Don't allow ALTER TABLE .. SET SCHEMA on relations that can't be moved
19657 : * to a different schema, such as indexes and TOAST tables.
19658 : */
19659 33394 : if (IsA(stmt, AlterObjectSchemaStmt))
19660 : {
19661 90 : if (relkind == RELKIND_INDEX || relkind == RELKIND_PARTITIONED_INDEX)
19662 0 : ereport(ERROR,
19663 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19664 : errmsg("cannot change schema of index \"%s\"",
19665 : rv->relname),
19666 : errhint("Change the schema of the table instead.")));
19667 90 : else if (relkind == RELKIND_COMPOSITE_TYPE)
19668 0 : ereport(ERROR,
19669 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19670 : errmsg("cannot change schema of composite type \"%s\"",
19671 : rv->relname),
19672 : /* translator: %s is an SQL ALTER command */
19673 : errhint("Use %s instead.",
19674 : "ALTER TYPE")));
19675 90 : else if (relkind == RELKIND_TOASTVALUE)
19676 0 : ereport(ERROR,
19677 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19678 : errmsg("cannot change schema of TOAST table \"%s\"",
19679 : rv->relname),
19680 : errhint("Change the schema of the table instead.")));
19681 : }
19682 :
19683 33394 : ReleaseSysCache(tuple);
19684 : }
19685 :
19686 : /*
19687 : * Transform any expressions present in the partition key
19688 : *
19689 : * Returns a transformed PartitionSpec.
19690 : */
19691 : static PartitionSpec *
19692 5064 : transformPartitionSpec(Relation rel, PartitionSpec *partspec)
19693 : {
19694 : PartitionSpec *newspec;
19695 : ParseState *pstate;
19696 : ParseNamespaceItem *nsitem;
19697 : ListCell *l;
19698 :
19699 5064 : newspec = makeNode(PartitionSpec);
19700 :
19701 5064 : newspec->strategy = partspec->strategy;
19702 5064 : newspec->partParams = NIL;
19703 5064 : newspec->location = partspec->location;
19704 :
19705 : /* Check valid number of columns for strategy */
19706 7592 : if (partspec->strategy == PARTITION_STRATEGY_LIST &&
19707 2528 : list_length(partspec->partParams) != 1)
19708 6 : ereport(ERROR,
19709 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19710 : errmsg("cannot use \"list\" partition strategy with more than one column")));
19711 :
19712 : /*
19713 : * Create a dummy ParseState and insert the target relation as its sole
19714 : * rangetable entry. We need a ParseState for transformExpr.
19715 : */
19716 5058 : pstate = make_parsestate(NULL);
19717 5058 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
19718 : NULL, false, true);
19719 5058 : addNSItemToQuery(pstate, nsitem, true, true, true);
19720 :
19721 : /* take care of any partition expressions */
19722 10542 : foreach(l, partspec->partParams)
19723 : {
19724 5508 : PartitionElem *pelem = lfirst_node(PartitionElem, l);
19725 :
19726 5508 : if (pelem->expr)
19727 : {
19728 : /* Copy, to avoid scribbling on the input */
19729 304 : pelem = copyObject(pelem);
19730 :
19731 : /* Now do parse transformation of the expression */
19732 304 : pelem->expr = transformExpr(pstate, pelem->expr,
19733 : EXPR_KIND_PARTITION_EXPRESSION);
19734 :
19735 : /* we have to fix its collations too */
19736 280 : assign_expr_collations(pstate, pelem->expr);
19737 : }
19738 :
19739 5484 : newspec->partParams = lappend(newspec->partParams, pelem);
19740 : }
19741 :
19742 5034 : return newspec;
19743 : }
19744 :
19745 : /*
19746 : * Compute per-partition-column information from a list of PartitionElems.
19747 : * Expressions in the PartitionElems must be parse-analyzed already.
19748 : */
19749 : static void
19750 5034 : ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
19751 : List **partexprs, Oid *partopclass, Oid *partcollation,
19752 : PartitionStrategy strategy)
19753 : {
19754 : int attn;
19755 : ListCell *lc;
19756 : Oid am_oid;
19757 :
19758 5034 : attn = 0;
19759 10422 : foreach(lc, partParams)
19760 : {
19761 5484 : PartitionElem *pelem = lfirst_node(PartitionElem, lc);
19762 : Oid atttype;
19763 : Oid attcollation;
19764 :
19765 5484 : if (pelem->name != NULL)
19766 : {
19767 : /* Simple attribute reference */
19768 : HeapTuple atttuple;
19769 : Form_pg_attribute attform;
19770 :
19771 5204 : atttuple = SearchSysCacheAttName(RelationGetRelid(rel),
19772 5204 : pelem->name);
19773 5204 : if (!HeapTupleIsValid(atttuple))
19774 12 : ereport(ERROR,
19775 : (errcode(ERRCODE_UNDEFINED_COLUMN),
19776 : errmsg("column \"%s\" named in partition key does not exist",
19777 : pelem->name),
19778 : parser_errposition(pstate, pelem->location)));
19779 5192 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
19780 :
19781 5192 : if (attform->attnum <= 0)
19782 6 : ereport(ERROR,
19783 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19784 : errmsg("cannot use system column \"%s\" in partition key",
19785 : pelem->name),
19786 : parser_errposition(pstate, pelem->location)));
19787 :
19788 : /*
19789 : * Stored generated columns cannot work: They are computed after
19790 : * BEFORE triggers, but partition routing is done before all
19791 : * triggers. Maybe virtual generated columns could be made to
19792 : * work, but then they would need to be handled as an expression
19793 : * below.
19794 : */
19795 5186 : if (attform->attgenerated)
19796 12 : ereport(ERROR,
19797 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19798 : errmsg("cannot use generated column in partition key"),
19799 : errdetail("Column \"%s\" is a generated column.",
19800 : pelem->name),
19801 : parser_errposition(pstate, pelem->location)));
19802 :
19803 5174 : partattrs[attn] = attform->attnum;
19804 5174 : atttype = attform->atttypid;
19805 5174 : attcollation = attform->attcollation;
19806 5174 : ReleaseSysCache(atttuple);
19807 : }
19808 : else
19809 : {
19810 : /* Expression */
19811 280 : Node *expr = pelem->expr;
19812 : char partattname[16];
19813 :
19814 : Assert(expr != NULL);
19815 280 : atttype = exprType(expr);
19816 280 : attcollation = exprCollation(expr);
19817 :
19818 : /*
19819 : * The expression must be of a storable type (e.g., not RECORD).
19820 : * The test is the same as for whether a table column is of a safe
19821 : * type (which is why we needn't check for the non-expression
19822 : * case).
19823 : */
19824 280 : snprintf(partattname, sizeof(partattname), "%d", attn + 1);
19825 280 : CheckAttributeType(partattname,
19826 : atttype, attcollation,
19827 : NIL, CHKATYPE_IS_PARTKEY);
19828 :
19829 : /*
19830 : * Strip any top-level COLLATE clause. This ensures that we treat
19831 : * "x COLLATE y" and "(x COLLATE y)" alike.
19832 : */
19833 268 : while (IsA(expr, CollateExpr))
19834 0 : expr = (Node *) ((CollateExpr *) expr)->arg;
19835 :
19836 268 : if (IsA(expr, Var) &&
19837 12 : ((Var *) expr)->varattno > 0)
19838 : {
19839 : /*
19840 : * User wrote "(column)" or "(column COLLATE something)".
19841 : * Treat it like simple attribute anyway.
19842 : */
19843 6 : partattrs[attn] = ((Var *) expr)->varattno;
19844 : }
19845 : else
19846 : {
19847 262 : Bitmapset *expr_attrs = NULL;
19848 : int i;
19849 :
19850 262 : partattrs[attn] = 0; /* marks the column as expression */
19851 262 : *partexprs = lappend(*partexprs, expr);
19852 :
19853 : /*
19854 : * transformPartitionSpec() should have already rejected
19855 : * subqueries, aggregates, window functions, and SRFs, based
19856 : * on the EXPR_KIND_ for partition expressions.
19857 : */
19858 :
19859 : /*
19860 : * Cannot allow system column references, since that would
19861 : * make partition routing impossible: their values won't be
19862 : * known yet when we need to do that.
19863 : */
19864 262 : pull_varattnos(expr, 1, &expr_attrs);
19865 2096 : for (i = FirstLowInvalidHeapAttributeNumber; i < 0; i++)
19866 : {
19867 1834 : if (bms_is_member(i - FirstLowInvalidHeapAttributeNumber,
19868 : expr_attrs))
19869 0 : ereport(ERROR,
19870 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19871 : errmsg("partition key expressions cannot contain system column references")));
19872 : }
19873 :
19874 : /*
19875 : * Stored generated columns cannot work: They are computed
19876 : * after BEFORE triggers, but partition routing is done before
19877 : * all triggers. Virtual generated columns could probably
19878 : * work, but it would require more work elsewhere (for example
19879 : * SET EXPRESSION would need to check whether the column is
19880 : * used in partition keys). Seems safer to prohibit for now.
19881 : */
19882 262 : i = -1;
19883 570 : while ((i = bms_next_member(expr_attrs, i)) >= 0)
19884 : {
19885 320 : AttrNumber attno = i + FirstLowInvalidHeapAttributeNumber;
19886 :
19887 320 : if (attno > 0 &&
19888 314 : TupleDescAttr(RelationGetDescr(rel), attno - 1)->attgenerated)
19889 12 : ereport(ERROR,
19890 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19891 : errmsg("cannot use generated column in partition key"),
19892 : errdetail("Column \"%s\" is a generated column.",
19893 : get_attname(RelationGetRelid(rel), attno, false)),
19894 : parser_errposition(pstate, pelem->location)));
19895 : }
19896 :
19897 : /*
19898 : * Preprocess the expression before checking for mutability.
19899 : * This is essential for the reasons described in
19900 : * contain_mutable_functions_after_planning. However, we call
19901 : * expression_planner for ourselves rather than using that
19902 : * function, because if constant-folding reduces the
19903 : * expression to a constant, we'd like to know that so we can
19904 : * complain below.
19905 : *
19906 : * Like contain_mutable_functions_after_planning, assume that
19907 : * expression_planner won't scribble on its input, so this
19908 : * won't affect the partexprs entry we saved above.
19909 : */
19910 250 : expr = (Node *) expression_planner((Expr *) expr);
19911 :
19912 : /*
19913 : * Partition expressions cannot contain mutable functions,
19914 : * because a given row must always map to the same partition
19915 : * as long as there is no change in the partition boundary
19916 : * structure.
19917 : */
19918 250 : if (contain_mutable_functions(expr))
19919 6 : ereport(ERROR,
19920 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19921 : errmsg("functions in partition key expression must be marked IMMUTABLE")));
19922 :
19923 : /*
19924 : * While it is not exactly *wrong* for a partition expression
19925 : * to be a constant, it seems better to reject such keys.
19926 : */
19927 244 : if (IsA(expr, Const))
19928 12 : ereport(ERROR,
19929 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19930 : errmsg("cannot use constant expression as partition key")));
19931 : }
19932 : }
19933 :
19934 : /*
19935 : * Apply collation override if any
19936 : */
19937 5412 : if (pelem->collation)
19938 54 : attcollation = get_collation_oid(pelem->collation, false);
19939 :
19940 : /*
19941 : * Check we have a collation iff it's a collatable type. The only
19942 : * expected failures here are (1) COLLATE applied to a noncollatable
19943 : * type, or (2) partition expression had an unresolved collation. But
19944 : * we might as well code this to be a complete consistency check.
19945 : */
19946 5412 : if (type_is_collatable(atttype))
19947 : {
19948 606 : if (!OidIsValid(attcollation))
19949 0 : ereport(ERROR,
19950 : (errcode(ERRCODE_INDETERMINATE_COLLATION),
19951 : errmsg("could not determine which collation to use for partition expression"),
19952 : errhint("Use the COLLATE clause to set the collation explicitly.")));
19953 : }
19954 : else
19955 : {
19956 4806 : if (OidIsValid(attcollation))
19957 0 : ereport(ERROR,
19958 : (errcode(ERRCODE_DATATYPE_MISMATCH),
19959 : errmsg("collations are not supported by type %s",
19960 : format_type_be(atttype))));
19961 : }
19962 :
19963 5412 : partcollation[attn] = attcollation;
19964 :
19965 : /*
19966 : * Identify the appropriate operator class. For list and range
19967 : * partitioning, we use a btree operator class; hash partitioning uses
19968 : * a hash operator class.
19969 : */
19970 5412 : if (strategy == PARTITION_STRATEGY_HASH)
19971 320 : am_oid = HASH_AM_OID;
19972 : else
19973 5092 : am_oid = BTREE_AM_OID;
19974 :
19975 5412 : if (!pelem->opclass)
19976 : {
19977 5274 : partopclass[attn] = GetDefaultOpClass(atttype, am_oid);
19978 :
19979 5274 : if (!OidIsValid(partopclass[attn]))
19980 : {
19981 12 : if (strategy == PARTITION_STRATEGY_HASH)
19982 0 : ereport(ERROR,
19983 : (errcode(ERRCODE_UNDEFINED_OBJECT),
19984 : errmsg("data type %s has no default operator class for access method \"%s\"",
19985 : format_type_be(atttype), "hash"),
19986 : errhint("You must specify a hash operator class or define a default hash operator class for the data type.")));
19987 : else
19988 12 : ereport(ERROR,
19989 : (errcode(ERRCODE_UNDEFINED_OBJECT),
19990 : errmsg("data type %s has no default operator class for access method \"%s\"",
19991 : format_type_be(atttype), "btree"),
19992 : errhint("You must specify a btree operator class or define a default btree operator class for the data type.")));
19993 : }
19994 : }
19995 : else
19996 138 : partopclass[attn] = ResolveOpClass(pelem->opclass,
19997 : atttype,
19998 : am_oid == HASH_AM_OID ? "hash" : "btree",
19999 : am_oid);
20000 :
20001 5388 : attn++;
20002 : }
20003 4938 : }
20004 :
20005 : /*
20006 : * PartConstraintImpliedByRelConstraint
20007 : * Do scanrel's existing constraints imply the partition constraint?
20008 : *
20009 : * "Existing constraints" include its check constraints and column-level
20010 : * not-null constraints. partConstraint describes the partition constraint,
20011 : * in implicit-AND form.
20012 : */
20013 : bool
20014 3066 : PartConstraintImpliedByRelConstraint(Relation scanrel,
20015 : List *partConstraint)
20016 : {
20017 3066 : List *existConstraint = NIL;
20018 3066 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20019 : int i;
20020 :
20021 3066 : if (constr && constr->has_not_null)
20022 : {
20023 790 : int natts = scanrel->rd_att->natts;
20024 :
20025 2614 : for (i = 1; i <= natts; i++)
20026 : {
20027 1824 : CompactAttribute *att = TupleDescCompactAttr(scanrel->rd_att, i - 1);
20028 :
20029 : /* invalid not-null constraint must be ignored here */
20030 1824 : if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
20031 : {
20032 1086 : Form_pg_attribute wholeatt = TupleDescAttr(scanrel->rd_att, i - 1);
20033 1086 : NullTest *ntest = makeNode(NullTest);
20034 :
20035 1086 : ntest->arg = (Expr *) makeVar(1,
20036 : i,
20037 : wholeatt->atttypid,
20038 : wholeatt->atttypmod,
20039 : wholeatt->attcollation,
20040 : 0);
20041 1086 : ntest->nulltesttype = IS_NOT_NULL;
20042 :
20043 : /*
20044 : * argisrow=false is correct even for a composite column,
20045 : * because attnotnull does not represent a SQL-spec IS NOT
20046 : * NULL test in such a case, just IS DISTINCT FROM NULL.
20047 : */
20048 1086 : ntest->argisrow = false;
20049 1086 : ntest->location = -1;
20050 1086 : existConstraint = lappend(existConstraint, ntest);
20051 : }
20052 : }
20053 : }
20054 :
20055 3066 : return ConstraintImpliedByRelConstraint(scanrel, partConstraint, existConstraint);
20056 : }
20057 :
20058 : /*
20059 : * ConstraintImpliedByRelConstraint
20060 : * Do scanrel's existing constraints imply the given constraint?
20061 : *
20062 : * testConstraint is the constraint to validate. provenConstraint is a
20063 : * caller-provided list of conditions which this function may assume
20064 : * to be true. Both provenConstraint and testConstraint must be in
20065 : * implicit-AND form, must only contain immutable clauses, and must
20066 : * contain only Vars with varno = 1.
20067 : */
20068 : bool
20069 4310 : ConstraintImpliedByRelConstraint(Relation scanrel, List *testConstraint, List *provenConstraint)
20070 : {
20071 4310 : List *existConstraint = list_copy(provenConstraint);
20072 4310 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20073 : int num_check,
20074 : i;
20075 :
20076 4310 : num_check = (constr != NULL) ? constr->num_check : 0;
20077 4818 : for (i = 0; i < num_check; i++)
20078 : {
20079 : Node *cexpr;
20080 :
20081 : /*
20082 : * If this constraint hasn't been fully validated yet, we must ignore
20083 : * it here.
20084 : */
20085 508 : if (!constr->check[i].ccvalid)
20086 6 : continue;
20087 :
20088 : /*
20089 : * NOT ENFORCED constraints are always marked as invalid, which should
20090 : * have been ignored.
20091 : */
20092 : Assert(constr->check[i].ccenforced);
20093 :
20094 502 : cexpr = stringToNode(constr->check[i].ccbin);
20095 :
20096 : /*
20097 : * Run each expression through const-simplification and
20098 : * canonicalization. It is necessary, because we will be comparing it
20099 : * to similarly-processed partition constraint expressions, and may
20100 : * fail to detect valid matches without this.
20101 : */
20102 502 : cexpr = eval_const_expressions(NULL, cexpr);
20103 502 : cexpr = (Node *) canonicalize_qual((Expr *) cexpr, true);
20104 :
20105 502 : existConstraint = list_concat(existConstraint,
20106 502 : make_ands_implicit((Expr *) cexpr));
20107 : }
20108 :
20109 : /*
20110 : * Try to make the proof. Since we are comparing CHECK constraints, we
20111 : * need to use weak implication, i.e., we assume existConstraint is
20112 : * not-false and try to prove the same for testConstraint.
20113 : *
20114 : * Note that predicate_implied_by assumes its first argument is known
20115 : * immutable. That should always be true for both NOT NULL and partition
20116 : * constraints, so we don't test it here.
20117 : */
20118 4310 : return predicate_implied_by(testConstraint, existConstraint, true);
20119 : }
20120 :
20121 : /*
20122 : * QueuePartitionConstraintValidation
20123 : *
20124 : * Add an entry to wqueue to have the given partition constraint validated by
20125 : * Phase 3, for the given relation, and all its children.
20126 : *
20127 : * We first verify whether the given constraint is implied by pre-existing
20128 : * relation constraints; if it is, there's no need to scan the table to
20129 : * validate, so don't queue in that case.
20130 : */
20131 : static void
20132 2576 : QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
20133 : List *partConstraint,
20134 : bool validate_default)
20135 : {
20136 : /*
20137 : * Based on the table's existing constraints, determine whether or not we
20138 : * may skip scanning the table.
20139 : */
20140 2576 : if (PartConstraintImpliedByRelConstraint(scanrel, partConstraint))
20141 : {
20142 88 : if (!validate_default)
20143 66 : ereport(DEBUG1,
20144 : (errmsg_internal("partition constraint for table \"%s\" is implied by existing constraints",
20145 : RelationGetRelationName(scanrel))));
20146 : else
20147 22 : ereport(DEBUG1,
20148 : (errmsg_internal("updated partition constraint for default partition \"%s\" is implied by existing constraints",
20149 : RelationGetRelationName(scanrel))));
20150 88 : return;
20151 : }
20152 :
20153 : /*
20154 : * Constraints proved insufficient. For plain relations, queue a
20155 : * validation item now; for partitioned tables, recurse to process each
20156 : * partition.
20157 : */
20158 2488 : if (scanrel->rd_rel->relkind == RELKIND_RELATION)
20159 : {
20160 : AlteredTableInfo *tab;
20161 :
20162 : /* Grab a work queue entry. */
20163 2070 : tab = ATGetQueueEntry(wqueue, scanrel);
20164 : Assert(tab->partition_constraint == NULL);
20165 2070 : tab->partition_constraint = (Expr *) linitial(partConstraint);
20166 2070 : tab->validate_default = validate_default;
20167 : }
20168 418 : else if (scanrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20169 : {
20170 366 : PartitionDesc partdesc = RelationGetPartitionDesc(scanrel, true);
20171 : int i;
20172 :
20173 756 : for (i = 0; i < partdesc->nparts; i++)
20174 : {
20175 : Relation part_rel;
20176 : List *thisPartConstraint;
20177 :
20178 : /*
20179 : * This is the minimum lock we need to prevent deadlocks.
20180 : */
20181 390 : part_rel = table_open(partdesc->oids[i], AccessExclusiveLock);
20182 :
20183 : /*
20184 : * Adjust the constraint for scanrel so that it matches this
20185 : * partition's attribute numbers.
20186 : */
20187 : thisPartConstraint =
20188 390 : map_partition_varattnos(partConstraint, 1,
20189 : part_rel, scanrel);
20190 :
20191 390 : QueuePartitionConstraintValidation(wqueue, part_rel,
20192 : thisPartConstraint,
20193 : validate_default);
20194 390 : table_close(part_rel, NoLock); /* keep lock till commit */
20195 : }
20196 : }
20197 : }
20198 :
20199 : /*
20200 : * ALTER TABLE <name> ATTACH PARTITION <partition-name> FOR VALUES
20201 : *
20202 : * Return the address of the newly attached partition.
20203 : */
20204 : static ObjectAddress
20205 2406 : ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd,
20206 : AlterTableUtilityContext *context)
20207 : {
20208 : Relation attachrel,
20209 : catalog;
20210 : List *attachrel_children;
20211 : List *partConstraint;
20212 : SysScanDesc scan;
20213 : ScanKeyData skey;
20214 : AttrNumber attno;
20215 : int natts;
20216 : TupleDesc tupleDesc;
20217 : ObjectAddress address;
20218 : const char *trigger_name;
20219 : Oid defaultPartOid;
20220 : List *partBoundConstraint;
20221 2406 : ParseState *pstate = make_parsestate(NULL);
20222 :
20223 2406 : pstate->p_sourcetext = context->queryString;
20224 :
20225 : /*
20226 : * We must lock the default partition if one exists, because attaching a
20227 : * new partition will change its partition constraint.
20228 : */
20229 : defaultPartOid =
20230 2406 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20231 2406 : if (OidIsValid(defaultPartOid))
20232 182 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20233 :
20234 2406 : attachrel = table_openrv(cmd->name, AccessExclusiveLock);
20235 :
20236 : /*
20237 : * XXX I think it'd be a good idea to grab locks on all tables referenced
20238 : * by FKs at this point also.
20239 : */
20240 :
20241 : /*
20242 : * Must be owner of both parent and source table -- parent was checked by
20243 : * ATSimplePermissions call in ATPrepCmd
20244 : */
20245 2400 : ATSimplePermissions(AT_AttachPartition, attachrel,
20246 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
20247 :
20248 : /* A partition can only have one parent */
20249 2394 : if (attachrel->rd_rel->relispartition)
20250 6 : ereport(ERROR,
20251 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20252 : errmsg("\"%s\" is already a partition",
20253 : RelationGetRelationName(attachrel))));
20254 :
20255 2388 : if (OidIsValid(attachrel->rd_rel->reloftype))
20256 6 : ereport(ERROR,
20257 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20258 : errmsg("cannot attach a typed table as partition")));
20259 :
20260 : /*
20261 : * Table being attached should not already be part of inheritance; either
20262 : * as a child table...
20263 : */
20264 2382 : catalog = table_open(InheritsRelationId, AccessShareLock);
20265 2382 : ScanKeyInit(&skey,
20266 : Anum_pg_inherits_inhrelid,
20267 : BTEqualStrategyNumber, F_OIDEQ,
20268 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20269 2382 : scan = systable_beginscan(catalog, InheritsRelidSeqnoIndexId, true,
20270 : NULL, 1, &skey);
20271 2382 : if (HeapTupleIsValid(systable_getnext(scan)))
20272 6 : ereport(ERROR,
20273 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20274 : errmsg("cannot attach inheritance child as partition")));
20275 2376 : systable_endscan(scan);
20276 :
20277 : /* ...or as a parent table (except the case when it is partitioned) */
20278 2376 : ScanKeyInit(&skey,
20279 : Anum_pg_inherits_inhparent,
20280 : BTEqualStrategyNumber, F_OIDEQ,
20281 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20282 2376 : scan = systable_beginscan(catalog, InheritsParentIndexId, true, NULL,
20283 : 1, &skey);
20284 2376 : if (HeapTupleIsValid(systable_getnext(scan)) &&
20285 262 : attachrel->rd_rel->relkind == RELKIND_RELATION)
20286 6 : ereport(ERROR,
20287 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20288 : errmsg("cannot attach inheritance parent as partition")));
20289 2370 : systable_endscan(scan);
20290 2370 : table_close(catalog, AccessShareLock);
20291 :
20292 : /*
20293 : * Prevent circularity by seeing if rel is a partition of attachrel. (In
20294 : * particular, this disallows making a rel a partition of itself.)
20295 : *
20296 : * We do that by checking if rel is a member of the list of attachrel's
20297 : * partitions provided the latter is partitioned at all. We want to avoid
20298 : * having to construct this list again, so we request the strongest lock
20299 : * on all partitions. We need the strongest lock, because we may decide
20300 : * to scan them if we find out that the table being attached (or its leaf
20301 : * partitions) may contain rows that violate the partition constraint. If
20302 : * the table has a constraint that would prevent such rows, which by
20303 : * definition is present in all the partitions, we need not scan the
20304 : * table, nor its partitions. But we cannot risk a deadlock by taking a
20305 : * weaker lock now and the stronger one only when needed.
20306 : */
20307 2370 : attachrel_children = find_all_inheritors(RelationGetRelid(attachrel),
20308 : AccessExclusiveLock, NULL);
20309 2370 : if (list_member_oid(attachrel_children, RelationGetRelid(rel)))
20310 12 : ereport(ERROR,
20311 : (errcode(ERRCODE_DUPLICATE_TABLE),
20312 : errmsg("circular inheritance not allowed"),
20313 : errdetail("\"%s\" is already a child of \"%s\".",
20314 : RelationGetRelationName(rel),
20315 : RelationGetRelationName(attachrel))));
20316 :
20317 : /* If the parent is permanent, so must be all of its partitions. */
20318 2358 : if (rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
20319 2316 : attachrel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
20320 6 : ereport(ERROR,
20321 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20322 : errmsg("cannot attach a temporary relation as partition of permanent relation \"%s\"",
20323 : RelationGetRelationName(rel))));
20324 :
20325 : /* Temp parent cannot have a partition that is itself not a temp */
20326 2352 : if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20327 42 : attachrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
20328 18 : ereport(ERROR,
20329 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20330 : errmsg("cannot attach a permanent relation as partition of temporary relation \"%s\"",
20331 : RelationGetRelationName(rel))));
20332 :
20333 : /* If the parent is temp, it must belong to this session */
20334 2334 : if (RELATION_IS_OTHER_TEMP(rel))
20335 0 : ereport(ERROR,
20336 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20337 : errmsg("cannot attach as partition of temporary relation of another session")));
20338 :
20339 : /* Ditto for the partition */
20340 2334 : if (RELATION_IS_OTHER_TEMP(attachrel))
20341 0 : ereport(ERROR,
20342 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20343 : errmsg("cannot attach temporary relation of another session as partition")));
20344 :
20345 : /*
20346 : * Check if attachrel has any identity columns or any columns that aren't
20347 : * in the parent.
20348 : */
20349 2334 : tupleDesc = RelationGetDescr(attachrel);
20350 2334 : natts = tupleDesc->natts;
20351 7962 : for (attno = 1; attno <= natts; attno++)
20352 : {
20353 5670 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc, attno - 1);
20354 5670 : char *attributeName = NameStr(attribute->attname);
20355 :
20356 : /* Ignore dropped */
20357 5670 : if (attribute->attisdropped)
20358 580 : continue;
20359 :
20360 5090 : if (attribute->attidentity)
20361 24 : ereport(ERROR,
20362 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20363 : errmsg("table \"%s\" being attached contains an identity column \"%s\"",
20364 : RelationGetRelationName(attachrel), attributeName),
20365 : errdetail("The new partition may not contain an identity column."));
20366 :
20367 : /* Try to find the column in parent (matching on column name) */
20368 5066 : if (!SearchSysCacheExists2(ATTNAME,
20369 : ObjectIdGetDatum(RelationGetRelid(rel)),
20370 : CStringGetDatum(attributeName)))
20371 18 : ereport(ERROR,
20372 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20373 : errmsg("table \"%s\" contains column \"%s\" not found in parent \"%s\"",
20374 : RelationGetRelationName(attachrel), attributeName,
20375 : RelationGetRelationName(rel)),
20376 : errdetail("The new partition may contain only the columns present in parent.")));
20377 : }
20378 :
20379 : /*
20380 : * If child_rel has row-level triggers with transition tables, we
20381 : * currently don't allow it to become a partition. See also prohibitions
20382 : * in ATExecAddInherit() and CreateTrigger().
20383 : */
20384 2292 : trigger_name = FindTriggerIncompatibleWithInheritance(attachrel->trigdesc);
20385 2292 : if (trigger_name != NULL)
20386 6 : ereport(ERROR,
20387 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
20388 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming a partition",
20389 : trigger_name, RelationGetRelationName(attachrel)),
20390 : errdetail("ROW triggers with transition tables are not supported on partitions.")));
20391 :
20392 : /*
20393 : * Check that the new partition's bound is valid and does not overlap any
20394 : * of existing partitions of the parent - note that it does not return on
20395 : * error.
20396 : */
20397 2286 : check_new_partition_bound(RelationGetRelationName(attachrel), rel,
20398 : cmd->bound, pstate);
20399 :
20400 : /* OK to create inheritance. Rest of the checks performed there */
20401 2250 : CreateInheritance(attachrel, rel, true);
20402 :
20403 : /* Update the pg_class entry. */
20404 2142 : StorePartitionBound(attachrel, rel, cmd->bound);
20405 :
20406 : /* Ensure there exists a correct set of indexes in the partition. */
20407 2142 : AttachPartitionEnsureIndexes(wqueue, rel, attachrel);
20408 :
20409 : /* and triggers */
20410 2112 : CloneRowTriggersToPartition(rel, attachrel);
20411 :
20412 : /*
20413 : * Clone foreign key constraints. Callee is responsible for setting up
20414 : * for phase 3 constraint verification.
20415 : */
20416 2106 : CloneForeignKeyConstraints(wqueue, rel, attachrel);
20417 :
20418 : /*
20419 : * Generate partition constraint from the partition bound specification.
20420 : * If the parent itself is a partition, make sure to include its
20421 : * constraint as well.
20422 : */
20423 2088 : partBoundConstraint = get_qual_from_partbound(rel, cmd->bound);
20424 :
20425 : /*
20426 : * Use list_concat_copy() to avoid modifying partBoundConstraint in place,
20427 : * since it's needed later to construct the constraint expression for
20428 : * validating against the default partition, if any.
20429 : */
20430 2088 : partConstraint = list_concat_copy(partBoundConstraint,
20431 2088 : RelationGetPartitionQual(rel));
20432 :
20433 : /* Skip validation if there are no constraints to validate. */
20434 2088 : if (partConstraint)
20435 : {
20436 : /*
20437 : * Run the partition quals through const-simplification similar to
20438 : * check constraints. We skip canonicalize_qual, though, because
20439 : * partition quals should be in canonical form already.
20440 : */
20441 : partConstraint =
20442 2040 : (List *) eval_const_expressions(NULL,
20443 : (Node *) partConstraint);
20444 :
20445 : /* XXX this sure looks wrong */
20446 2040 : partConstraint = list_make1(make_ands_explicit(partConstraint));
20447 :
20448 : /*
20449 : * Adjust the generated constraint to match this partition's attribute
20450 : * numbers.
20451 : */
20452 2040 : partConstraint = map_partition_varattnos(partConstraint, 1, attachrel,
20453 : rel);
20454 :
20455 : /* Validate partition constraints against the table being attached. */
20456 2040 : QueuePartitionConstraintValidation(wqueue, attachrel, partConstraint,
20457 : false);
20458 : }
20459 :
20460 : /*
20461 : * If we're attaching a partition other than the default partition and a
20462 : * default one exists, then that partition's partition constraint changes,
20463 : * so add an entry to the work queue to validate it, too. (We must not do
20464 : * this when the partition being attached is the default one; we already
20465 : * did it above!)
20466 : */
20467 2088 : if (OidIsValid(defaultPartOid))
20468 : {
20469 : Relation defaultrel;
20470 : List *defPartConstraint;
20471 :
20472 : Assert(!cmd->bound->is_default);
20473 :
20474 : /* we already hold a lock on the default partition */
20475 146 : defaultrel = table_open(defaultPartOid, NoLock);
20476 : defPartConstraint =
20477 146 : get_proposed_default_constraint(partBoundConstraint);
20478 :
20479 : /*
20480 : * Map the Vars in the constraint expression from rel's attnos to
20481 : * defaultrel's.
20482 : */
20483 : defPartConstraint =
20484 146 : map_partition_varattnos(defPartConstraint,
20485 : 1, defaultrel, rel);
20486 146 : QueuePartitionConstraintValidation(wqueue, defaultrel,
20487 : defPartConstraint, true);
20488 :
20489 : /* keep our lock until commit. */
20490 146 : table_close(defaultrel, NoLock);
20491 : }
20492 :
20493 2088 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(attachrel));
20494 :
20495 : /*
20496 : * If the partition we just attached is partitioned itself, invalidate
20497 : * relcache for all descendent partitions too to ensure that their
20498 : * rd_partcheck expression trees are rebuilt; partitions already locked at
20499 : * the beginning of this function.
20500 : */
20501 2088 : if (attachrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20502 : {
20503 : ListCell *l;
20504 :
20505 1032 : foreach(l, attachrel_children)
20506 : {
20507 690 : CacheInvalidateRelcacheByRelid(lfirst_oid(l));
20508 : }
20509 : }
20510 :
20511 : /* keep our lock until commit */
20512 2088 : table_close(attachrel, NoLock);
20513 :
20514 2088 : return address;
20515 : }
20516 :
20517 : /*
20518 : * AttachPartitionEnsureIndexes
20519 : * subroutine for ATExecAttachPartition to create/match indexes
20520 : *
20521 : * Enforce the indexing rule for partitioned tables during ALTER TABLE / ATTACH
20522 : * PARTITION: every partition must have an index attached to each index on the
20523 : * partitioned table.
20524 : */
20525 : static void
20526 2142 : AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
20527 : {
20528 : List *idxes;
20529 : List *attachRelIdxs;
20530 : Relation *attachrelIdxRels;
20531 : IndexInfo **attachInfos;
20532 : ListCell *cell;
20533 : MemoryContext cxt;
20534 : MemoryContext oldcxt;
20535 :
20536 2142 : cxt = AllocSetContextCreate(CurrentMemoryContext,
20537 : "AttachPartitionEnsureIndexes",
20538 : ALLOCSET_DEFAULT_SIZES);
20539 2142 : oldcxt = MemoryContextSwitchTo(cxt);
20540 :
20541 2142 : idxes = RelationGetIndexList(rel);
20542 2142 : attachRelIdxs = RelationGetIndexList(attachrel);
20543 2142 : attachrelIdxRels = palloc(sizeof(Relation) * list_length(attachRelIdxs));
20544 2142 : attachInfos = palloc(sizeof(IndexInfo *) * list_length(attachRelIdxs));
20545 :
20546 : /* Build arrays of all existing indexes and their IndexInfos */
20547 4666 : foreach_oid(cldIdxId, attachRelIdxs)
20548 : {
20549 382 : int i = foreach_current_index(cldIdxId);
20550 :
20551 382 : attachrelIdxRels[i] = index_open(cldIdxId, AccessShareLock);
20552 382 : attachInfos[i] = BuildIndexInfo(attachrelIdxRels[i]);
20553 : }
20554 :
20555 : /*
20556 : * If we're attaching a foreign table, we must fail if any of the indexes
20557 : * is a constraint index; otherwise, there's nothing to do here. Do this
20558 : * before starting work, to avoid wasting the effort of building a few
20559 : * non-unique indexes before coming across a unique one.
20560 : */
20561 2142 : if (attachrel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
20562 : {
20563 88 : foreach(cell, idxes)
20564 : {
20565 36 : Oid idx = lfirst_oid(cell);
20566 36 : Relation idxRel = index_open(idx, AccessShareLock);
20567 :
20568 36 : if (idxRel->rd_index->indisunique ||
20569 24 : idxRel->rd_index->indisprimary)
20570 12 : ereport(ERROR,
20571 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20572 : errmsg("cannot attach foreign table \"%s\" as partition of partitioned table \"%s\"",
20573 : RelationGetRelationName(attachrel),
20574 : RelationGetRelationName(rel)),
20575 : errdetail("Partitioned table \"%s\" contains unique indexes.",
20576 : RelationGetRelationName(rel))));
20577 24 : index_close(idxRel, AccessShareLock);
20578 : }
20579 :
20580 52 : goto out;
20581 : }
20582 :
20583 : /*
20584 : * For each index on the partitioned table, find a matching one in the
20585 : * partition-to-be; if one is not found, create one.
20586 : */
20587 2510 : foreach(cell, idxes)
20588 : {
20589 450 : Oid idx = lfirst_oid(cell);
20590 450 : Relation idxRel = index_open(idx, AccessShareLock);
20591 : IndexInfo *info;
20592 : AttrMap *attmap;
20593 450 : bool found = false;
20594 : Oid constraintOid;
20595 :
20596 : /*
20597 : * Ignore indexes in the partitioned table other than partitioned
20598 : * indexes.
20599 : */
20600 450 : if (idxRel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
20601 : {
20602 0 : index_close(idxRel, AccessShareLock);
20603 0 : continue;
20604 : }
20605 :
20606 : /* construct an indexinfo to compare existing indexes against */
20607 450 : info = BuildIndexInfo(idxRel);
20608 450 : attmap = build_attrmap_by_name(RelationGetDescr(attachrel),
20609 : RelationGetDescr(rel),
20610 : false);
20611 450 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(rel), idx);
20612 :
20613 : /*
20614 : * Scan the list of existing indexes in the partition-to-be, and mark
20615 : * the first matching, valid, unattached one we find, if any, as
20616 : * partition of the parent index. If we find one, we're done.
20617 : */
20618 510 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20619 : {
20620 274 : Oid cldIdxId = RelationGetRelid(attachrelIdxRels[i]);
20621 274 : Oid cldConstrOid = InvalidOid;
20622 :
20623 : /* does this index have a parent? if so, can't use it */
20624 274 : if (attachrelIdxRels[i]->rd_rel->relispartition)
20625 12 : continue;
20626 :
20627 : /* If this index is invalid, can't use it */
20628 262 : if (!attachrelIdxRels[i]->rd_index->indisvalid)
20629 6 : continue;
20630 :
20631 256 : if (CompareIndexInfo(attachInfos[i], info,
20632 256 : attachrelIdxRels[i]->rd_indcollation,
20633 256 : idxRel->rd_indcollation,
20634 256 : attachrelIdxRels[i]->rd_opfamily,
20635 256 : idxRel->rd_opfamily,
20636 : attmap))
20637 : {
20638 : /*
20639 : * If this index is being created in the parent because of a
20640 : * constraint, then the child needs to have a constraint also,
20641 : * so look for one. If there is no such constraint, this
20642 : * index is no good, so keep looking.
20643 : */
20644 220 : if (OidIsValid(constraintOid))
20645 : {
20646 : cldConstrOid =
20647 122 : get_relation_idx_constraint_oid(RelationGetRelid(attachrel),
20648 : cldIdxId);
20649 : /* no dice */
20650 122 : if (!OidIsValid(cldConstrOid))
20651 6 : continue;
20652 :
20653 : /* Ensure they're both the same type of constraint */
20654 232 : if (get_constraint_type(constraintOid) !=
20655 116 : get_constraint_type(cldConstrOid))
20656 0 : continue;
20657 : }
20658 :
20659 : /* bingo. */
20660 214 : IndexSetParentIndex(attachrelIdxRels[i], idx);
20661 214 : if (OidIsValid(constraintOid))
20662 116 : ConstraintSetParentConstraint(cldConstrOid, constraintOid,
20663 : RelationGetRelid(attachrel));
20664 214 : found = true;
20665 :
20666 214 : CommandCounterIncrement();
20667 214 : break;
20668 : }
20669 : }
20670 :
20671 : /*
20672 : * If no suitable index was found in the partition-to-be, create one
20673 : * now. Note that if this is a PK, not-null constraints must already
20674 : * exist.
20675 : */
20676 450 : if (!found)
20677 : {
20678 : IndexStmt *stmt;
20679 : Oid conOid;
20680 :
20681 236 : stmt = generateClonedIndexStmt(NULL,
20682 : idxRel, attmap,
20683 : &conOid);
20684 236 : DefineIndex(RelationGetRelid(attachrel), stmt, InvalidOid,
20685 : RelationGetRelid(idxRel),
20686 : conOid,
20687 : -1,
20688 : true, false, false, false, false);
20689 : }
20690 :
20691 432 : index_close(idxRel, AccessShareLock);
20692 : }
20693 :
20694 2112 : out:
20695 : /* Clean up. */
20696 2482 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20697 370 : index_close(attachrelIdxRels[i], AccessShareLock);
20698 2112 : MemoryContextSwitchTo(oldcxt);
20699 2112 : MemoryContextDelete(cxt);
20700 2112 : }
20701 :
20702 : /*
20703 : * CloneRowTriggersToPartition
20704 : * subroutine for ATExecAttachPartition/DefineRelation to create row
20705 : * triggers on partitions
20706 : */
20707 : static void
20708 2556 : CloneRowTriggersToPartition(Relation parent, Relation partition)
20709 : {
20710 : Relation pg_trigger;
20711 : ScanKeyData key;
20712 : SysScanDesc scan;
20713 : HeapTuple tuple;
20714 : MemoryContext perTupCxt;
20715 :
20716 2556 : ScanKeyInit(&key, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
20717 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parent)));
20718 2556 : pg_trigger = table_open(TriggerRelationId, RowExclusiveLock);
20719 2556 : scan = systable_beginscan(pg_trigger, TriggerRelidNameIndexId,
20720 : true, NULL, 1, &key);
20721 :
20722 2556 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
20723 : "clone trig", ALLOCSET_SMALL_SIZES);
20724 :
20725 4418 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
20726 : {
20727 1868 : Form_pg_trigger trigForm = (Form_pg_trigger) GETSTRUCT(tuple);
20728 : CreateTrigStmt *trigStmt;
20729 1868 : Node *qual = NULL;
20730 : Datum value;
20731 : bool isnull;
20732 1868 : List *cols = NIL;
20733 1868 : List *trigargs = NIL;
20734 : MemoryContext oldcxt;
20735 :
20736 : /*
20737 : * Ignore statement-level triggers; those are not cloned.
20738 : */
20739 1868 : if (!TRIGGER_FOR_ROW(trigForm->tgtype))
20740 1712 : continue;
20741 :
20742 : /*
20743 : * Don't clone internal triggers, because the constraint cloning code
20744 : * will.
20745 : */
20746 1850 : if (trigForm->tgisinternal)
20747 1694 : continue;
20748 :
20749 : /*
20750 : * Complain if we find an unexpected trigger type.
20751 : */
20752 156 : if (!TRIGGER_FOR_BEFORE(trigForm->tgtype) &&
20753 138 : !TRIGGER_FOR_AFTER(trigForm->tgtype))
20754 0 : elog(ERROR, "unexpected trigger \"%s\" found",
20755 : NameStr(trigForm->tgname));
20756 :
20757 : /* Use short-lived context for CREATE TRIGGER */
20758 156 : oldcxt = MemoryContextSwitchTo(perTupCxt);
20759 :
20760 : /*
20761 : * If there is a WHEN clause, generate a 'cooked' version of it that's
20762 : * appropriate for the partition.
20763 : */
20764 156 : value = heap_getattr(tuple, Anum_pg_trigger_tgqual,
20765 : RelationGetDescr(pg_trigger), &isnull);
20766 156 : if (!isnull)
20767 : {
20768 6 : qual = stringToNode(TextDatumGetCString(value));
20769 6 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
20770 : partition, parent);
20771 6 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
20772 : partition, parent);
20773 : }
20774 :
20775 : /*
20776 : * If there is a column list, transform it to a list of column names.
20777 : * Note we don't need to map this list in any way ...
20778 : */
20779 156 : if (trigForm->tgattr.dim1 > 0)
20780 : {
20781 : int i;
20782 :
20783 12 : for (i = 0; i < trigForm->tgattr.dim1; i++)
20784 : {
20785 : Form_pg_attribute col;
20786 :
20787 6 : col = TupleDescAttr(parent->rd_att,
20788 6 : trigForm->tgattr.values[i] - 1);
20789 6 : cols = lappend(cols,
20790 6 : makeString(pstrdup(NameStr(col->attname))));
20791 : }
20792 : }
20793 :
20794 : /* Reconstruct trigger arguments list. */
20795 156 : if (trigForm->tgnargs > 0)
20796 : {
20797 : char *p;
20798 :
20799 12 : value = heap_getattr(tuple, Anum_pg_trigger_tgargs,
20800 : RelationGetDescr(pg_trigger), &isnull);
20801 12 : if (isnull)
20802 0 : elog(ERROR, "tgargs is null for trigger \"%s\" in partition \"%s\"",
20803 : NameStr(trigForm->tgname), RelationGetRelationName(partition));
20804 :
20805 12 : p = (char *) VARDATA_ANY(DatumGetByteaPP(value));
20806 :
20807 36 : for (int i = 0; i < trigForm->tgnargs; i++)
20808 : {
20809 24 : trigargs = lappend(trigargs, makeString(pstrdup(p)));
20810 24 : p += strlen(p) + 1;
20811 : }
20812 : }
20813 :
20814 156 : trigStmt = makeNode(CreateTrigStmt);
20815 156 : trigStmt->replace = false;
20816 156 : trigStmt->isconstraint = OidIsValid(trigForm->tgconstraint);
20817 156 : trigStmt->trigname = NameStr(trigForm->tgname);
20818 156 : trigStmt->relation = NULL;
20819 156 : trigStmt->funcname = NULL; /* passed separately */
20820 156 : trigStmt->args = trigargs;
20821 156 : trigStmt->row = true;
20822 156 : trigStmt->timing = trigForm->tgtype & TRIGGER_TYPE_TIMING_MASK;
20823 156 : trigStmt->events = trigForm->tgtype & TRIGGER_TYPE_EVENT_MASK;
20824 156 : trigStmt->columns = cols;
20825 156 : trigStmt->whenClause = NULL; /* passed separately */
20826 156 : trigStmt->transitionRels = NIL; /* not supported at present */
20827 156 : trigStmt->deferrable = trigForm->tgdeferrable;
20828 156 : trigStmt->initdeferred = trigForm->tginitdeferred;
20829 156 : trigStmt->constrrel = NULL; /* passed separately */
20830 :
20831 156 : CreateTriggerFiringOn(trigStmt, NULL, RelationGetRelid(partition),
20832 : trigForm->tgconstrrelid, InvalidOid, InvalidOid,
20833 : trigForm->tgfoid, trigForm->oid, qual,
20834 156 : false, true, trigForm->tgenabled);
20835 :
20836 150 : MemoryContextSwitchTo(oldcxt);
20837 150 : MemoryContextReset(perTupCxt);
20838 : }
20839 :
20840 2550 : MemoryContextDelete(perTupCxt);
20841 :
20842 2550 : systable_endscan(scan);
20843 2550 : table_close(pg_trigger, RowExclusiveLock);
20844 2550 : }
20845 :
20846 : /*
20847 : * ALTER TABLE DETACH PARTITION
20848 : *
20849 : * Return the address of the relation that is no longer a partition of rel.
20850 : *
20851 : * If concurrent mode is requested, we run in two transactions. A side-
20852 : * effect is that this command cannot run in a multi-part ALTER TABLE.
20853 : * Currently, that's enforced by the grammar.
20854 : *
20855 : * The strategy for concurrency is to first modify the partition's
20856 : * pg_inherit catalog row to make it visible to everyone that the
20857 : * partition is detached, lock the partition against writes, and commit
20858 : * the transaction; anyone who requests the partition descriptor from
20859 : * that point onwards has to ignore such a partition. In a second
20860 : * transaction, we wait until all transactions that could have seen the
20861 : * partition as attached are gone, then we remove the rest of partition
20862 : * metadata (pg_inherits and pg_class.relpartbounds).
20863 : */
20864 : static ObjectAddress
20865 578 : ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
20866 : RangeVar *name, bool concurrent)
20867 : {
20868 : Relation partRel;
20869 : ObjectAddress address;
20870 : Oid defaultPartOid;
20871 :
20872 : /*
20873 : * We must lock the default partition, because detaching this partition
20874 : * will change its partition constraint.
20875 : */
20876 : defaultPartOid =
20877 578 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20878 578 : if (OidIsValid(defaultPartOid))
20879 : {
20880 : /*
20881 : * Concurrent detaching when a default partition exists is not
20882 : * supported. The main problem is that the default partition
20883 : * constraint would change. And there's a definitional problem: what
20884 : * should happen to the tuples that are being inserted that belong to
20885 : * the partition being detached? Putting them on the partition being
20886 : * detached would be wrong, since they'd become "lost" after the
20887 : * detaching completes but we cannot put them in the default partition
20888 : * either until we alter its partition constraint.
20889 : *
20890 : * I think we could solve this problem if we effected the constraint
20891 : * change before committing the first transaction. But the lock would
20892 : * have to remain AEL and it would cause concurrent query planning to
20893 : * be blocked, so changing it that way would be even worse.
20894 : */
20895 106 : if (concurrent)
20896 12 : ereport(ERROR,
20897 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20898 : errmsg("cannot detach partitions concurrently when a default partition exists")));
20899 94 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20900 : }
20901 :
20902 : /*
20903 : * In concurrent mode, the partition is locked with share-update-exclusive
20904 : * in the first transaction. This allows concurrent transactions to be
20905 : * doing DML to the partition.
20906 : */
20907 566 : partRel = table_openrv(name, concurrent ? ShareUpdateExclusiveLock :
20908 : AccessExclusiveLock);
20909 :
20910 : /*
20911 : * Check inheritance conditions and either delete the pg_inherits row (in
20912 : * non-concurrent mode) or just set the inhdetachpending flag.
20913 : */
20914 554 : if (!concurrent)
20915 408 : RemoveInheritance(partRel, rel, false);
20916 : else
20917 146 : MarkInheritDetached(partRel, rel);
20918 :
20919 : /*
20920 : * Ensure that foreign keys still hold after this detach. This keeps
20921 : * locks on the referencing tables, which prevents concurrent transactions
20922 : * from adding rows that we wouldn't see. For this to work in concurrent
20923 : * mode, it is critical that the partition appears as no longer attached
20924 : * for the RI queries as soon as the first transaction commits.
20925 : */
20926 534 : ATDetachCheckNoForeignKeyRefs(partRel);
20927 :
20928 : /*
20929 : * Concurrent mode has to work harder; first we add a new constraint to
20930 : * the partition that matches the partition constraint. Then we close our
20931 : * existing transaction, and in a new one wait for all processes to catch
20932 : * up on the catalog updates we've done so far; at that point we can
20933 : * complete the operation.
20934 : */
20935 500 : if (concurrent)
20936 : {
20937 : Oid partrelid,
20938 : parentrelid;
20939 : LOCKTAG tag;
20940 : char *parentrelname;
20941 : char *partrelname;
20942 :
20943 : /*
20944 : * We're almost done now; the only traces that remain are the
20945 : * pg_inherits tuple and the partition's relpartbounds. Before we can
20946 : * remove those, we need to wait until all transactions that know that
20947 : * this is a partition are gone.
20948 : */
20949 :
20950 : /*
20951 : * Remember relation OIDs to re-acquire them later; and relation names
20952 : * too, for error messages if something is dropped in between.
20953 : */
20954 140 : partrelid = RelationGetRelid(partRel);
20955 140 : parentrelid = RelationGetRelid(rel);
20956 140 : parentrelname = MemoryContextStrdup(PortalContext,
20957 140 : RelationGetRelationName(rel));
20958 140 : partrelname = MemoryContextStrdup(PortalContext,
20959 140 : RelationGetRelationName(partRel));
20960 :
20961 : /* Invalidate relcache entries for the parent -- must be before close */
20962 140 : CacheInvalidateRelcache(rel);
20963 :
20964 140 : table_close(partRel, NoLock);
20965 140 : table_close(rel, NoLock);
20966 140 : tab->rel = NULL;
20967 :
20968 : /* Make updated catalog entry visible */
20969 140 : PopActiveSnapshot();
20970 140 : CommitTransactionCommand();
20971 :
20972 140 : StartTransactionCommand();
20973 :
20974 : /*
20975 : * Now wait. This ensures that all queries that were planned
20976 : * including the partition are finished before we remove the rest of
20977 : * catalog entries. We don't need or indeed want to acquire this
20978 : * lock, though -- that would block later queries.
20979 : *
20980 : * We don't need to concern ourselves with waiting for a lock on the
20981 : * partition itself, since we will acquire AccessExclusiveLock below.
20982 : */
20983 140 : SET_LOCKTAG_RELATION(tag, MyDatabaseId, parentrelid);
20984 140 : WaitForLockersMultiple(list_make1(&tag), AccessExclusiveLock, false);
20985 :
20986 : /*
20987 : * Now acquire locks in both relations again. Note they may have been
20988 : * removed in the meantime, so care is required.
20989 : */
20990 90 : rel = try_relation_open(parentrelid, ShareUpdateExclusiveLock);
20991 90 : partRel = try_relation_open(partrelid, AccessExclusiveLock);
20992 :
20993 : /* If the relations aren't there, something bad happened; bail out */
20994 90 : if (rel == NULL)
20995 : {
20996 0 : if (partRel != NULL) /* shouldn't happen */
20997 0 : elog(WARNING, "dangling partition \"%s\" remains, can't fix",
20998 : partrelname);
20999 0 : ereport(ERROR,
21000 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21001 : errmsg("partitioned table \"%s\" was removed concurrently",
21002 : parentrelname)));
21003 : }
21004 90 : if (partRel == NULL)
21005 0 : ereport(ERROR,
21006 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21007 : errmsg("partition \"%s\" was removed concurrently", partrelname)));
21008 :
21009 90 : tab->rel = rel;
21010 : }
21011 :
21012 : /*
21013 : * Detaching the partition might involve TOAST table access, so ensure we
21014 : * have a valid snapshot.
21015 : */
21016 450 : PushActiveSnapshot(GetTransactionSnapshot());
21017 :
21018 : /* Do the final part of detaching */
21019 450 : DetachPartitionFinalize(rel, partRel, concurrent, defaultPartOid);
21020 :
21021 448 : PopActiveSnapshot();
21022 :
21023 448 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21024 :
21025 : /* keep our lock until commit */
21026 448 : table_close(partRel, NoLock);
21027 :
21028 448 : return address;
21029 : }
21030 :
21031 : /*
21032 : * Second part of ALTER TABLE .. DETACH.
21033 : *
21034 : * This is separate so that it can be run independently when the second
21035 : * transaction of the concurrent algorithm fails (crash or abort).
21036 : */
21037 : static void
21038 464 : DetachPartitionFinalize(Relation rel, Relation partRel, bool concurrent,
21039 : Oid defaultPartOid)
21040 : {
21041 : Relation classRel;
21042 : List *fks;
21043 : ListCell *cell;
21044 : List *indexes;
21045 : Datum new_val[Natts_pg_class];
21046 : bool new_null[Natts_pg_class],
21047 : new_repl[Natts_pg_class];
21048 : HeapTuple tuple,
21049 : newtuple;
21050 464 : Relation trigrel = NULL;
21051 464 : List *fkoids = NIL;
21052 :
21053 464 : if (concurrent)
21054 : {
21055 : /*
21056 : * We can remove the pg_inherits row now. (In the non-concurrent case,
21057 : * this was already done).
21058 : */
21059 104 : RemoveInheritance(partRel, rel, true);
21060 : }
21061 :
21062 : /* Drop any triggers that were cloned on creation/attach. */
21063 464 : DropClonedTriggersFromPartition(RelationGetRelid(partRel));
21064 :
21065 : /*
21066 : * Detach any foreign keys that are inherited. This includes creating
21067 : * additional action triggers.
21068 : */
21069 464 : fks = copyObject(RelationGetFKeyList(partRel));
21070 464 : if (fks != NIL)
21071 84 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
21072 :
21073 : /*
21074 : * It's possible that the partition being detached has a foreign key that
21075 : * references a partitioned table. When that happens, there are multiple
21076 : * pg_constraint rows for the partition: one points to the partitioned
21077 : * table itself, while the others point to each of its partitions. Only
21078 : * the topmost one is to be considered here; the child constraints must be
21079 : * left alone, because conceptually those aren't coming from our parent
21080 : * partitioned table, but from this partition itself.
21081 : *
21082 : * We implement this by collecting all the constraint OIDs in a first scan
21083 : * of the FK array, and skipping in the loop below those constraints whose
21084 : * parents are listed here.
21085 : */
21086 1096 : foreach_node(ForeignKeyCacheInfo, fk, fks)
21087 168 : fkoids = lappend_oid(fkoids, fk->conoid);
21088 :
21089 632 : foreach(cell, fks)
21090 : {
21091 168 : ForeignKeyCacheInfo *fk = lfirst(cell);
21092 : HeapTuple contup;
21093 : Form_pg_constraint conform;
21094 :
21095 168 : contup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
21096 168 : if (!HeapTupleIsValid(contup))
21097 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
21098 168 : conform = (Form_pg_constraint) GETSTRUCT(contup);
21099 :
21100 : /*
21101 : * Consider only inherited foreign keys, and only if their parents
21102 : * aren't in the list.
21103 : */
21104 168 : if (conform->contype != CONSTRAINT_FOREIGN ||
21105 312 : !OidIsValid(conform->conparentid) ||
21106 144 : list_member_oid(fkoids, conform->conparentid))
21107 : {
21108 66 : ReleaseSysCache(contup);
21109 66 : continue;
21110 : }
21111 :
21112 : /*
21113 : * The constraint on this table must be marked no longer a child of
21114 : * the parent's constraint, as do its check triggers.
21115 : */
21116 102 : ConstraintSetParentConstraint(fk->conoid, InvalidOid, InvalidOid);
21117 :
21118 : /*
21119 : * Also, look up the partition's "check" triggers corresponding to the
21120 : * ENFORCED constraint being detached and detach them from the parent
21121 : * triggers. NOT ENFORCED constraints do not have these triggers;
21122 : * therefore, this step is not needed.
21123 : */
21124 102 : if (fk->conenforced)
21125 : {
21126 : Oid insertTriggerOid,
21127 : updateTriggerOid;
21128 :
21129 102 : GetForeignKeyCheckTriggers(trigrel,
21130 : fk->conoid, fk->confrelid, fk->conrelid,
21131 : &insertTriggerOid, &updateTriggerOid);
21132 : Assert(OidIsValid(insertTriggerOid));
21133 102 : TriggerSetParentTrigger(trigrel, insertTriggerOid, InvalidOid,
21134 : RelationGetRelid(partRel));
21135 : Assert(OidIsValid(updateTriggerOid));
21136 102 : TriggerSetParentTrigger(trigrel, updateTriggerOid, InvalidOid,
21137 : RelationGetRelid(partRel));
21138 : }
21139 :
21140 : /*
21141 : * Lastly, create the action triggers on the referenced table, using
21142 : * addFkRecurseReferenced, which requires some elaborate setup (so put
21143 : * it in a separate block). While at it, if the table is partitioned,
21144 : * that function will recurse to create the pg_constraint rows and
21145 : * action triggers for each partition.
21146 : *
21147 : * Note there's no need to do addFkConstraint() here, because the
21148 : * pg_constraint row already exists.
21149 : */
21150 : {
21151 : Constraint *fkconstraint;
21152 : int numfks;
21153 : AttrNumber conkey[INDEX_MAX_KEYS];
21154 : AttrNumber confkey[INDEX_MAX_KEYS];
21155 : Oid conpfeqop[INDEX_MAX_KEYS];
21156 : Oid conppeqop[INDEX_MAX_KEYS];
21157 : Oid conffeqop[INDEX_MAX_KEYS];
21158 : int numfkdelsetcols;
21159 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
21160 : Relation refdRel;
21161 :
21162 102 : DeconstructFkConstraintRow(contup,
21163 : &numfks,
21164 : conkey,
21165 : confkey,
21166 : conpfeqop,
21167 : conppeqop,
21168 : conffeqop,
21169 : &numfkdelsetcols,
21170 : confdelsetcols);
21171 :
21172 : /* Create a synthetic node we'll use throughout */
21173 102 : fkconstraint = makeNode(Constraint);
21174 102 : fkconstraint->contype = CONSTRAINT_FOREIGN;
21175 102 : fkconstraint->conname = pstrdup(NameStr(conform->conname));
21176 102 : fkconstraint->deferrable = conform->condeferrable;
21177 102 : fkconstraint->initdeferred = conform->condeferred;
21178 102 : fkconstraint->is_enforced = conform->conenforced;
21179 102 : fkconstraint->skip_validation = true;
21180 102 : fkconstraint->initially_valid = conform->convalidated;
21181 : /* a few irrelevant fields omitted here */
21182 102 : fkconstraint->pktable = NULL;
21183 102 : fkconstraint->fk_attrs = NIL;
21184 102 : fkconstraint->pk_attrs = NIL;
21185 102 : fkconstraint->fk_matchtype = conform->confmatchtype;
21186 102 : fkconstraint->fk_upd_action = conform->confupdtype;
21187 102 : fkconstraint->fk_del_action = conform->confdeltype;
21188 102 : fkconstraint->fk_del_set_cols = NIL;
21189 102 : fkconstraint->old_conpfeqop = NIL;
21190 102 : fkconstraint->old_pktable_oid = InvalidOid;
21191 102 : fkconstraint->location = -1;
21192 :
21193 : /* set up colnames, used to generate the constraint name */
21194 252 : for (int i = 0; i < numfks; i++)
21195 : {
21196 : Form_pg_attribute att;
21197 :
21198 150 : att = TupleDescAttr(RelationGetDescr(partRel),
21199 150 : conkey[i] - 1);
21200 :
21201 150 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
21202 150 : makeString(NameStr(att->attname)));
21203 : }
21204 :
21205 102 : refdRel = table_open(fk->confrelid, ShareRowExclusiveLock);
21206 :
21207 102 : addFkRecurseReferenced(fkconstraint, partRel,
21208 : refdRel,
21209 : conform->conindid,
21210 : fk->conoid,
21211 : numfks,
21212 : confkey,
21213 : conkey,
21214 : conpfeqop,
21215 : conppeqop,
21216 : conffeqop,
21217 : numfkdelsetcols,
21218 : confdelsetcols,
21219 : true,
21220 : InvalidOid, InvalidOid,
21221 102 : conform->conperiod);
21222 102 : table_close(refdRel, NoLock); /* keep lock till end of xact */
21223 : }
21224 :
21225 102 : ReleaseSysCache(contup);
21226 : }
21227 464 : list_free_deep(fks);
21228 464 : if (trigrel)
21229 84 : table_close(trigrel, RowExclusiveLock);
21230 :
21231 : /*
21232 : * Any sub-constraints that are in the referenced-side of a larger
21233 : * constraint have to be removed. This partition is no longer part of the
21234 : * key space of the constraint.
21235 : */
21236 524 : foreach(cell, GetParentedForeignKeyRefs(partRel))
21237 : {
21238 62 : Oid constrOid = lfirst_oid(cell);
21239 : ObjectAddress constraint;
21240 :
21241 62 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21242 62 : deleteDependencyRecordsForClass(ConstraintRelationId,
21243 : constrOid,
21244 : ConstraintRelationId,
21245 : DEPENDENCY_INTERNAL);
21246 62 : CommandCounterIncrement();
21247 :
21248 62 : ObjectAddressSet(constraint, ConstraintRelationId, constrOid);
21249 62 : performDeletion(&constraint, DROP_RESTRICT, 0);
21250 : }
21251 :
21252 : /* Now we can detach indexes */
21253 462 : indexes = RelationGetIndexList(partRel);
21254 656 : foreach(cell, indexes)
21255 : {
21256 194 : Oid idxid = lfirst_oid(cell);
21257 : Oid parentidx;
21258 : Relation idx;
21259 : Oid constrOid;
21260 : Oid parentConstrOid;
21261 :
21262 194 : if (!has_superclass(idxid))
21263 12 : continue;
21264 :
21265 182 : parentidx = get_partition_parent(idxid, false);
21266 : Assert((IndexGetRelation(parentidx, false) == RelationGetRelid(rel)));
21267 :
21268 182 : idx = index_open(idxid, AccessExclusiveLock);
21269 182 : IndexSetParentIndex(idx, InvalidOid);
21270 :
21271 : /*
21272 : * If there's a constraint associated with the index, detach it too.
21273 : * Careful: it is possible for a constraint index in a partition to be
21274 : * the child of a non-constraint index, so verify whether the parent
21275 : * index does actually have a constraint.
21276 : */
21277 182 : constrOid = get_relation_idx_constraint_oid(RelationGetRelid(partRel),
21278 : idxid);
21279 182 : parentConstrOid = get_relation_idx_constraint_oid(RelationGetRelid(rel),
21280 : parentidx);
21281 182 : if (OidIsValid(parentConstrOid) && OidIsValid(constrOid))
21282 84 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21283 :
21284 182 : index_close(idx, NoLock);
21285 : }
21286 :
21287 : /* Update pg_class tuple */
21288 462 : classRel = table_open(RelationRelationId, RowExclusiveLock);
21289 462 : tuple = SearchSysCacheCopy1(RELOID,
21290 : ObjectIdGetDatum(RelationGetRelid(partRel)));
21291 462 : if (!HeapTupleIsValid(tuple))
21292 0 : elog(ERROR, "cache lookup failed for relation %u",
21293 : RelationGetRelid(partRel));
21294 : Assert(((Form_pg_class) GETSTRUCT(tuple))->relispartition);
21295 :
21296 : /* Clear relpartbound and reset relispartition */
21297 462 : memset(new_val, 0, sizeof(new_val));
21298 462 : memset(new_null, false, sizeof(new_null));
21299 462 : memset(new_repl, false, sizeof(new_repl));
21300 462 : new_val[Anum_pg_class_relpartbound - 1] = (Datum) 0;
21301 462 : new_null[Anum_pg_class_relpartbound - 1] = true;
21302 462 : new_repl[Anum_pg_class_relpartbound - 1] = true;
21303 462 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
21304 : new_val, new_null, new_repl);
21305 :
21306 462 : ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = false;
21307 462 : CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
21308 462 : heap_freetuple(newtuple);
21309 462 : table_close(classRel, RowExclusiveLock);
21310 :
21311 : /*
21312 : * Drop identity property from all identity columns of partition.
21313 : */
21314 1318 : for (int attno = 0; attno < RelationGetNumberOfAttributes(partRel); attno++)
21315 : {
21316 856 : Form_pg_attribute attr = TupleDescAttr(partRel->rd_att, attno);
21317 :
21318 856 : if (!attr->attisdropped && attr->attidentity)
21319 6 : ATExecDropIdentity(partRel, NameStr(attr->attname), false,
21320 : AccessExclusiveLock, true, true);
21321 : }
21322 :
21323 462 : if (OidIsValid(defaultPartOid))
21324 : {
21325 : /*
21326 : * If the relation being detached is the default partition itself,
21327 : * remove it from the parent's pg_partitioned_table entry.
21328 : *
21329 : * If not, we must invalidate default partition's relcache entry, as
21330 : * in StorePartitionBound: its partition constraint depends on every
21331 : * other partition's partition constraint.
21332 : */
21333 46 : if (RelationGetRelid(partRel) == defaultPartOid)
21334 2 : update_default_partition_oid(RelationGetRelid(rel), InvalidOid);
21335 : else
21336 44 : CacheInvalidateRelcacheByRelid(defaultPartOid);
21337 : }
21338 :
21339 : /*
21340 : * Invalidate the parent's relcache so that the partition is no longer
21341 : * included in its partition descriptor.
21342 : */
21343 462 : CacheInvalidateRelcache(rel);
21344 :
21345 : /*
21346 : * If the partition we just detached is partitioned itself, invalidate
21347 : * relcache for all descendent partitions too to ensure that their
21348 : * rd_partcheck expression trees are rebuilt; must lock partitions before
21349 : * doing so, using the same lockmode as what partRel has been locked with
21350 : * by the caller.
21351 : */
21352 462 : if (partRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
21353 : {
21354 : List *children;
21355 :
21356 62 : children = find_all_inheritors(RelationGetRelid(partRel),
21357 : AccessExclusiveLock, NULL);
21358 204 : foreach(cell, children)
21359 : {
21360 142 : CacheInvalidateRelcacheByRelid(lfirst_oid(cell));
21361 : }
21362 : }
21363 462 : }
21364 :
21365 : /*
21366 : * ALTER TABLE ... DETACH PARTITION ... FINALIZE
21367 : *
21368 : * To use when a DETACH PARTITION command previously did not run to
21369 : * completion; this completes the detaching process.
21370 : */
21371 : static ObjectAddress
21372 14 : ATExecDetachPartitionFinalize(Relation rel, RangeVar *name)
21373 : {
21374 : Relation partRel;
21375 : ObjectAddress address;
21376 14 : Snapshot snap = GetActiveSnapshot();
21377 :
21378 14 : partRel = table_openrv(name, AccessExclusiveLock);
21379 :
21380 : /*
21381 : * Wait until existing snapshots are gone. This is important if the
21382 : * second transaction of DETACH PARTITION CONCURRENTLY is canceled: the
21383 : * user could immediately run DETACH FINALIZE without actually waiting for
21384 : * existing transactions. We must not complete the detach action until
21385 : * all such queries are complete (otherwise we would present them with an
21386 : * inconsistent view of catalogs).
21387 : */
21388 14 : WaitForOlderSnapshots(snap->xmin, false);
21389 :
21390 14 : DetachPartitionFinalize(rel, partRel, true, InvalidOid);
21391 :
21392 14 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21393 :
21394 14 : table_close(partRel, NoLock);
21395 :
21396 14 : return address;
21397 : }
21398 :
21399 : /*
21400 : * DropClonedTriggersFromPartition
21401 : * subroutine for ATExecDetachPartition to remove any triggers that were
21402 : * cloned to the partition when it was created-as-partition or attached.
21403 : * This undoes what CloneRowTriggersToPartition did.
21404 : */
21405 : static void
21406 464 : DropClonedTriggersFromPartition(Oid partitionId)
21407 : {
21408 : ScanKeyData skey;
21409 : SysScanDesc scan;
21410 : HeapTuple trigtup;
21411 : Relation tgrel;
21412 : ObjectAddresses *objects;
21413 :
21414 464 : objects = new_object_addresses();
21415 :
21416 : /*
21417 : * Scan pg_trigger to search for all triggers on this rel.
21418 : */
21419 464 : ScanKeyInit(&skey, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21420 : F_OIDEQ, ObjectIdGetDatum(partitionId));
21421 464 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
21422 464 : scan = systable_beginscan(tgrel, TriggerRelidNameIndexId,
21423 : true, NULL, 1, &skey);
21424 876 : while (HeapTupleIsValid(trigtup = systable_getnext(scan)))
21425 : {
21426 412 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(trigtup);
21427 : ObjectAddress trig;
21428 :
21429 : /* Ignore triggers that weren't cloned */
21430 412 : if (!OidIsValid(pg_trigger->tgparentid))
21431 394 : continue;
21432 :
21433 : /*
21434 : * Ignore internal triggers that are implementation objects of foreign
21435 : * keys, because these will be detached when the foreign keys
21436 : * themselves are.
21437 : */
21438 346 : if (OidIsValid(pg_trigger->tgconstrrelid))
21439 328 : continue;
21440 :
21441 : /*
21442 : * This is ugly, but necessary: remove the dependency markings on the
21443 : * trigger so that it can be removed.
21444 : */
21445 18 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21446 : TriggerRelationId,
21447 : DEPENDENCY_PARTITION_PRI);
21448 18 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21449 : RelationRelationId,
21450 : DEPENDENCY_PARTITION_SEC);
21451 :
21452 : /* remember this trigger to remove it below */
21453 18 : ObjectAddressSet(trig, TriggerRelationId, pg_trigger->oid);
21454 18 : add_exact_object_address(&trig, objects);
21455 : }
21456 :
21457 : /* make the dependency removal visible to the deletion below */
21458 464 : CommandCounterIncrement();
21459 464 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
21460 :
21461 : /* done */
21462 464 : free_object_addresses(objects);
21463 464 : systable_endscan(scan);
21464 464 : table_close(tgrel, RowExclusiveLock);
21465 464 : }
21466 :
21467 : /*
21468 : * Before acquiring lock on an index, acquire the same lock on the owning
21469 : * table.
21470 : */
21471 : struct AttachIndexCallbackState
21472 : {
21473 : Oid partitionOid;
21474 : Oid parentTblOid;
21475 : bool lockedParentTbl;
21476 : };
21477 :
21478 : static void
21479 392 : RangeVarCallbackForAttachIndex(const RangeVar *rv, Oid relOid, Oid oldRelOid,
21480 : void *arg)
21481 : {
21482 : struct AttachIndexCallbackState *state;
21483 : Form_pg_class classform;
21484 : HeapTuple tuple;
21485 :
21486 392 : state = (struct AttachIndexCallbackState *) arg;
21487 :
21488 392 : if (!state->lockedParentTbl)
21489 : {
21490 380 : LockRelationOid(state->parentTblOid, AccessShareLock);
21491 380 : state->lockedParentTbl = true;
21492 : }
21493 :
21494 : /*
21495 : * If we previously locked some other heap, and the name we're looking up
21496 : * no longer refers to an index on that relation, release the now-useless
21497 : * lock. XXX maybe we should do *after* we verify whether the index does
21498 : * not actually belong to the same relation ...
21499 : */
21500 392 : if (relOid != oldRelOid && OidIsValid(state->partitionOid))
21501 : {
21502 0 : UnlockRelationOid(state->partitionOid, AccessShareLock);
21503 0 : state->partitionOid = InvalidOid;
21504 : }
21505 :
21506 : /* Didn't find a relation, so no need for locking or permission checks. */
21507 392 : if (!OidIsValid(relOid))
21508 6 : return;
21509 :
21510 386 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
21511 386 : if (!HeapTupleIsValid(tuple))
21512 0 : return; /* concurrently dropped, so nothing to do */
21513 386 : classform = (Form_pg_class) GETSTRUCT(tuple);
21514 386 : if (classform->relkind != RELKIND_PARTITIONED_INDEX &&
21515 294 : classform->relkind != RELKIND_INDEX)
21516 6 : ereport(ERROR,
21517 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21518 : errmsg("\"%s\" is not an index", rv->relname)));
21519 380 : ReleaseSysCache(tuple);
21520 :
21521 : /*
21522 : * Since we need only examine the heap's tupledesc, an access share lock
21523 : * on it (preventing any DDL) is sufficient.
21524 : */
21525 380 : state->partitionOid = IndexGetRelation(relOid, false);
21526 380 : LockRelationOid(state->partitionOid, AccessShareLock);
21527 : }
21528 :
21529 : /*
21530 : * ALTER INDEX i1 ATTACH PARTITION i2
21531 : */
21532 : static ObjectAddress
21533 380 : ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx, RangeVar *name)
21534 : {
21535 : Relation partIdx;
21536 : Relation partTbl;
21537 : Relation parentTbl;
21538 : ObjectAddress address;
21539 : Oid partIdxId;
21540 : Oid currParent;
21541 : struct AttachIndexCallbackState state;
21542 :
21543 : /*
21544 : * We need to obtain lock on the index 'name' to modify it, but we also
21545 : * need to read its owning table's tuple descriptor -- so we need to lock
21546 : * both. To avoid deadlocks, obtain lock on the table before doing so on
21547 : * the index. Furthermore, we need to examine the parent table of the
21548 : * partition, so lock that one too.
21549 : */
21550 380 : state.partitionOid = InvalidOid;
21551 380 : state.parentTblOid = parentIdx->rd_index->indrelid;
21552 380 : state.lockedParentTbl = false;
21553 : partIdxId =
21554 380 : RangeVarGetRelidExtended(name, AccessExclusiveLock, 0,
21555 : RangeVarCallbackForAttachIndex,
21556 : &state);
21557 : /* Not there? */
21558 368 : if (!OidIsValid(partIdxId))
21559 0 : ereport(ERROR,
21560 : (errcode(ERRCODE_UNDEFINED_OBJECT),
21561 : errmsg("index \"%s\" does not exist", name->relname)));
21562 :
21563 : /* no deadlock risk: RangeVarGetRelidExtended already acquired the lock */
21564 368 : partIdx = relation_open(partIdxId, AccessExclusiveLock);
21565 :
21566 : /* we already hold locks on both tables, so this is safe: */
21567 368 : parentTbl = relation_open(parentIdx->rd_index->indrelid, AccessShareLock);
21568 368 : partTbl = relation_open(partIdx->rd_index->indrelid, NoLock);
21569 :
21570 368 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partIdx));
21571 :
21572 : /* Silently do nothing if already in the right state */
21573 736 : currParent = partIdx->rd_rel->relispartition ?
21574 368 : get_partition_parent(partIdxId, false) : InvalidOid;
21575 368 : if (currParent != RelationGetRelid(parentIdx))
21576 : {
21577 : IndexInfo *childInfo;
21578 : IndexInfo *parentInfo;
21579 : AttrMap *attmap;
21580 : bool found;
21581 : int i;
21582 : PartitionDesc partDesc;
21583 : Oid constraintOid,
21584 344 : cldConstrId = InvalidOid;
21585 :
21586 : /*
21587 : * If this partition already has an index attached, refuse the
21588 : * operation.
21589 : */
21590 344 : refuseDupeIndexAttach(parentIdx, partIdx, partTbl);
21591 :
21592 338 : if (OidIsValid(currParent))
21593 0 : ereport(ERROR,
21594 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21595 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21596 : RelationGetRelationName(partIdx),
21597 : RelationGetRelationName(parentIdx)),
21598 : errdetail("Index \"%s\" is already attached to another index.",
21599 : RelationGetRelationName(partIdx))));
21600 :
21601 : /* Make sure it indexes a partition of the other index's table */
21602 338 : partDesc = RelationGetPartitionDesc(parentTbl, true);
21603 338 : found = false;
21604 528 : for (i = 0; i < partDesc->nparts; i++)
21605 : {
21606 522 : if (partDesc->oids[i] == state.partitionOid)
21607 : {
21608 332 : found = true;
21609 332 : break;
21610 : }
21611 : }
21612 338 : if (!found)
21613 6 : ereport(ERROR,
21614 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21615 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21616 : RelationGetRelationName(partIdx),
21617 : RelationGetRelationName(parentIdx)),
21618 : errdetail("Index \"%s\" is not an index on any partition of table \"%s\".",
21619 : RelationGetRelationName(partIdx),
21620 : RelationGetRelationName(parentTbl))));
21621 :
21622 : /* Ensure the indexes are compatible */
21623 332 : childInfo = BuildIndexInfo(partIdx);
21624 332 : parentInfo = BuildIndexInfo(parentIdx);
21625 332 : attmap = build_attrmap_by_name(RelationGetDescr(partTbl),
21626 : RelationGetDescr(parentTbl),
21627 : false);
21628 332 : if (!CompareIndexInfo(childInfo, parentInfo,
21629 332 : partIdx->rd_indcollation,
21630 332 : parentIdx->rd_indcollation,
21631 332 : partIdx->rd_opfamily,
21632 332 : parentIdx->rd_opfamily,
21633 : attmap))
21634 42 : ereport(ERROR,
21635 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21636 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21637 : RelationGetRelationName(partIdx),
21638 : RelationGetRelationName(parentIdx)),
21639 : errdetail("The index definitions do not match.")));
21640 :
21641 : /*
21642 : * If there is a constraint in the parent, make sure there is one in
21643 : * the child too.
21644 : */
21645 290 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(parentTbl),
21646 : RelationGetRelid(parentIdx));
21647 :
21648 290 : if (OidIsValid(constraintOid))
21649 : {
21650 110 : cldConstrId = get_relation_idx_constraint_oid(RelationGetRelid(partTbl),
21651 : partIdxId);
21652 110 : if (!OidIsValid(cldConstrId))
21653 6 : ereport(ERROR,
21654 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21655 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21656 : RelationGetRelationName(partIdx),
21657 : RelationGetRelationName(parentIdx)),
21658 : errdetail("The index \"%s\" belongs to a constraint in table \"%s\" but no constraint exists for index \"%s\".",
21659 : RelationGetRelationName(parentIdx),
21660 : RelationGetRelationName(parentTbl),
21661 : RelationGetRelationName(partIdx))));
21662 : }
21663 :
21664 : /*
21665 : * If it's a primary key, make sure the columns in the partition are
21666 : * NOT NULL.
21667 : */
21668 284 : if (parentIdx->rd_index->indisprimary)
21669 92 : verifyPartitionIndexNotNull(childInfo, partTbl);
21670 :
21671 : /* All good -- do it */
21672 284 : IndexSetParentIndex(partIdx, RelationGetRelid(parentIdx));
21673 284 : if (OidIsValid(constraintOid))
21674 104 : ConstraintSetParentConstraint(cldConstrId, constraintOid,
21675 : RelationGetRelid(partTbl));
21676 :
21677 284 : free_attrmap(attmap);
21678 :
21679 284 : validatePartitionedIndex(parentIdx, parentTbl);
21680 : }
21681 :
21682 308 : relation_close(parentTbl, AccessShareLock);
21683 : /* keep these locks till commit */
21684 308 : relation_close(partTbl, NoLock);
21685 308 : relation_close(partIdx, NoLock);
21686 :
21687 308 : return address;
21688 : }
21689 :
21690 : /*
21691 : * Verify whether the given partition already contains an index attached
21692 : * to the given partitioned index. If so, raise an error.
21693 : */
21694 : static void
21695 344 : refuseDupeIndexAttach(Relation parentIdx, Relation partIdx, Relation partitionTbl)
21696 : {
21697 : Oid existingIdx;
21698 :
21699 344 : existingIdx = index_get_partition(partitionTbl,
21700 : RelationGetRelid(parentIdx));
21701 344 : if (OidIsValid(existingIdx))
21702 6 : ereport(ERROR,
21703 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21704 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21705 : RelationGetRelationName(partIdx),
21706 : RelationGetRelationName(parentIdx)),
21707 : errdetail("Another index \"%s\" is already attached for partition \"%s\".",
21708 : get_rel_name(existingIdx),
21709 : RelationGetRelationName(partitionTbl))));
21710 338 : }
21711 :
21712 : /*
21713 : * Verify whether the set of attached partition indexes to a parent index on
21714 : * a partitioned table is complete. If it is, mark the parent index valid.
21715 : *
21716 : * This should be called each time a partition index is attached.
21717 : */
21718 : static void
21719 326 : validatePartitionedIndex(Relation partedIdx, Relation partedTbl)
21720 : {
21721 : Relation inheritsRel;
21722 : SysScanDesc scan;
21723 : ScanKeyData key;
21724 326 : int tuples = 0;
21725 : HeapTuple inhTup;
21726 326 : bool updated = false;
21727 :
21728 : Assert(partedIdx->rd_rel->relkind == RELKIND_PARTITIONED_INDEX);
21729 :
21730 : /*
21731 : * Scan pg_inherits for this parent index. Count each valid index we find
21732 : * (verifying the pg_index entry for each), and if we reach the total
21733 : * amount we expect, we can mark this parent index as valid.
21734 : */
21735 326 : inheritsRel = table_open(InheritsRelationId, AccessShareLock);
21736 326 : ScanKeyInit(&key, Anum_pg_inherits_inhparent,
21737 : BTEqualStrategyNumber, F_OIDEQ,
21738 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
21739 326 : scan = systable_beginscan(inheritsRel, InheritsParentIndexId, true,
21740 : NULL, 1, &key);
21741 844 : while ((inhTup = systable_getnext(scan)) != NULL)
21742 : {
21743 518 : Form_pg_inherits inhForm = (Form_pg_inherits) GETSTRUCT(inhTup);
21744 : HeapTuple indTup;
21745 : Form_pg_index indexForm;
21746 :
21747 518 : indTup = SearchSysCache1(INDEXRELID,
21748 : ObjectIdGetDatum(inhForm->inhrelid));
21749 518 : if (!HeapTupleIsValid(indTup))
21750 0 : elog(ERROR, "cache lookup failed for index %u", inhForm->inhrelid);
21751 518 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
21752 518 : if (indexForm->indisvalid)
21753 460 : tuples += 1;
21754 518 : ReleaseSysCache(indTup);
21755 : }
21756 :
21757 : /* Done with pg_inherits */
21758 326 : systable_endscan(scan);
21759 326 : table_close(inheritsRel, AccessShareLock);
21760 :
21761 : /*
21762 : * If we found as many inherited indexes as the partitioned table has
21763 : * partitions, we're good; update pg_index to set indisvalid.
21764 : */
21765 326 : if (tuples == RelationGetPartitionDesc(partedTbl, true)->nparts)
21766 : {
21767 : Relation idxRel;
21768 : HeapTuple indTup;
21769 : Form_pg_index indexForm;
21770 :
21771 164 : idxRel = table_open(IndexRelationId, RowExclusiveLock);
21772 164 : indTup = SearchSysCacheCopy1(INDEXRELID,
21773 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
21774 164 : if (!HeapTupleIsValid(indTup))
21775 0 : elog(ERROR, "cache lookup failed for index %u",
21776 : RelationGetRelid(partedIdx));
21777 164 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
21778 :
21779 164 : indexForm->indisvalid = true;
21780 164 : updated = true;
21781 :
21782 164 : CatalogTupleUpdate(idxRel, &indTup->t_self, indTup);
21783 :
21784 164 : table_close(idxRel, RowExclusiveLock);
21785 164 : heap_freetuple(indTup);
21786 : }
21787 :
21788 : /*
21789 : * If this index is in turn a partition of a larger index, validating it
21790 : * might cause the parent to become valid also. Try that.
21791 : */
21792 326 : if (updated && partedIdx->rd_rel->relispartition)
21793 : {
21794 : Oid parentIdxId,
21795 : parentTblId;
21796 : Relation parentIdx,
21797 : parentTbl;
21798 :
21799 : /* make sure we see the validation we just did */
21800 42 : CommandCounterIncrement();
21801 :
21802 42 : parentIdxId = get_partition_parent(RelationGetRelid(partedIdx), false);
21803 42 : parentTblId = get_partition_parent(RelationGetRelid(partedTbl), false);
21804 42 : parentIdx = relation_open(parentIdxId, AccessExclusiveLock);
21805 42 : parentTbl = relation_open(parentTblId, AccessExclusiveLock);
21806 : Assert(!parentIdx->rd_index->indisvalid);
21807 :
21808 42 : validatePartitionedIndex(parentIdx, parentTbl);
21809 :
21810 42 : relation_close(parentIdx, AccessExclusiveLock);
21811 42 : relation_close(parentTbl, AccessExclusiveLock);
21812 : }
21813 326 : }
21814 :
21815 : /*
21816 : * When attaching an index as a partition of a partitioned index which is a
21817 : * primary key, verify that all the columns in the partition are marked NOT
21818 : * NULL.
21819 : */
21820 : static void
21821 92 : verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition)
21822 : {
21823 186 : for (int i = 0; i < iinfo->ii_NumIndexKeyAttrs; i++)
21824 : {
21825 94 : Form_pg_attribute att = TupleDescAttr(RelationGetDescr(partition),
21826 94 : iinfo->ii_IndexAttrNumbers[i] - 1);
21827 :
21828 94 : if (!att->attnotnull)
21829 0 : ereport(ERROR,
21830 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
21831 : errmsg("invalid primary key definition"),
21832 : errdetail("Column \"%s\" of relation \"%s\" is not marked NOT NULL.",
21833 : NameStr(att->attname),
21834 : RelationGetRelationName(partition)));
21835 : }
21836 92 : }
21837 :
21838 : /*
21839 : * Return an OID list of constraints that reference the given relation
21840 : * that are marked as having a parent constraints.
21841 : */
21842 : static List *
21843 998 : GetParentedForeignKeyRefs(Relation partition)
21844 : {
21845 : Relation pg_constraint;
21846 : HeapTuple tuple;
21847 : SysScanDesc scan;
21848 : ScanKeyData key[2];
21849 998 : List *constraints = NIL;
21850 :
21851 : /*
21852 : * If no indexes, or no columns are referenceable by FKs, we can avoid the
21853 : * scan.
21854 : */
21855 1426 : if (RelationGetIndexList(partition) == NIL ||
21856 428 : bms_is_empty(RelationGetIndexAttrBitmap(partition,
21857 : INDEX_ATTR_BITMAP_KEY)))
21858 726 : return NIL;
21859 :
21860 : /* Search for constraints referencing this table */
21861 272 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
21862 272 : ScanKeyInit(&key[0],
21863 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
21864 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(partition)));
21865 272 : ScanKeyInit(&key[1],
21866 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
21867 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
21868 :
21869 : /* XXX This is a seqscan, as we don't have a usable index */
21870 272 : scan = systable_beginscan(pg_constraint, InvalidOid, true, NULL, 2, key);
21871 444 : while ((tuple = systable_getnext(scan)) != NULL)
21872 : {
21873 172 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
21874 :
21875 : /*
21876 : * We only need to process constraints that are part of larger ones.
21877 : */
21878 172 : if (!OidIsValid(constrForm->conparentid))
21879 0 : continue;
21880 :
21881 172 : constraints = lappend_oid(constraints, constrForm->oid);
21882 : }
21883 :
21884 272 : systable_endscan(scan);
21885 272 : table_close(pg_constraint, AccessShareLock);
21886 :
21887 272 : return constraints;
21888 : }
21889 :
21890 : /*
21891 : * During DETACH PARTITION, verify that any foreign keys pointing to the
21892 : * partitioned table would not become invalid. An error is raised if any
21893 : * referenced values exist.
21894 : */
21895 : static void
21896 534 : ATDetachCheckNoForeignKeyRefs(Relation partition)
21897 : {
21898 : List *constraints;
21899 : ListCell *cell;
21900 :
21901 534 : constraints = GetParentedForeignKeyRefs(partition);
21902 :
21903 610 : foreach(cell, constraints)
21904 : {
21905 110 : Oid constrOid = lfirst_oid(cell);
21906 : HeapTuple tuple;
21907 : Form_pg_constraint constrForm;
21908 : Relation rel;
21909 110 : Trigger trig = {0};
21910 :
21911 110 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
21912 110 : if (!HeapTupleIsValid(tuple))
21913 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
21914 110 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
21915 :
21916 : Assert(OidIsValid(constrForm->conparentid));
21917 : Assert(constrForm->confrelid == RelationGetRelid(partition));
21918 :
21919 : /* prevent data changes into the referencing table until commit */
21920 110 : rel = table_open(constrForm->conrelid, ShareLock);
21921 :
21922 110 : trig.tgoid = InvalidOid;
21923 110 : trig.tgname = NameStr(constrForm->conname);
21924 110 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
21925 110 : trig.tgisinternal = true;
21926 110 : trig.tgconstrrelid = RelationGetRelid(partition);
21927 110 : trig.tgconstrindid = constrForm->conindid;
21928 110 : trig.tgconstraint = constrForm->oid;
21929 110 : trig.tgdeferrable = false;
21930 110 : trig.tginitdeferred = false;
21931 : /* we needn't fill in remaining fields */
21932 :
21933 110 : RI_PartitionRemove_Check(&trig, rel, partition);
21934 :
21935 76 : ReleaseSysCache(tuple);
21936 :
21937 76 : table_close(rel, NoLock);
21938 : }
21939 500 : }
21940 :
21941 : /*
21942 : * resolve column compression specification to compression method.
21943 : */
21944 : static char
21945 259372 : GetAttributeCompression(Oid atttypid, const char *compression)
21946 : {
21947 : char cmethod;
21948 :
21949 259372 : if (compression == NULL || strcmp(compression, "default") == 0)
21950 259188 : return InvalidCompressionMethod;
21951 :
21952 : /*
21953 : * To specify a nondefault method, the column data type must be toastable.
21954 : * Note this says nothing about whether the column's attstorage setting
21955 : * permits compression; we intentionally allow attstorage and
21956 : * attcompression to be independent. But with a non-toastable type,
21957 : * attstorage could not be set to a value that would permit compression.
21958 : *
21959 : * We don't actually need to enforce this, since nothing bad would happen
21960 : * if attcompression were non-default; it would never be consulted. But
21961 : * it seems more user-friendly to complain about a certainly-useless
21962 : * attempt to set the property.
21963 : */
21964 184 : if (!TypeIsToastable(atttypid))
21965 6 : ereport(ERROR,
21966 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
21967 : errmsg("column data type %s does not support compression",
21968 : format_type_be(atttypid))));
21969 :
21970 178 : cmethod = CompressionNameToMethod(compression);
21971 178 : if (!CompressionMethodIsValid(cmethod))
21972 12 : ereport(ERROR,
21973 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
21974 : errmsg("invalid compression method \"%s\"", compression)));
21975 :
21976 166 : return cmethod;
21977 : }
21978 :
21979 : /*
21980 : * resolve column storage specification
21981 : */
21982 : static char
21983 274 : GetAttributeStorage(Oid atttypid, const char *storagemode)
21984 : {
21985 274 : char cstorage = 0;
21986 :
21987 274 : if (pg_strcasecmp(storagemode, "plain") == 0)
21988 56 : cstorage = TYPSTORAGE_PLAIN;
21989 218 : else if (pg_strcasecmp(storagemode, "external") == 0)
21990 176 : cstorage = TYPSTORAGE_EXTERNAL;
21991 42 : else if (pg_strcasecmp(storagemode, "extended") == 0)
21992 16 : cstorage = TYPSTORAGE_EXTENDED;
21993 26 : else if (pg_strcasecmp(storagemode, "main") == 0)
21994 20 : cstorage = TYPSTORAGE_MAIN;
21995 6 : else if (pg_strcasecmp(storagemode, "default") == 0)
21996 6 : cstorage = get_typstorage(atttypid);
21997 : else
21998 0 : ereport(ERROR,
21999 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
22000 : errmsg("invalid storage type \"%s\"",
22001 : storagemode)));
22002 :
22003 : /*
22004 : * safety check: do not allow toasted storage modes unless column datatype
22005 : * is TOAST-aware.
22006 : */
22007 274 : if (!(cstorage == TYPSTORAGE_PLAIN || TypeIsToastable(atttypid)))
22008 6 : ereport(ERROR,
22009 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
22010 : errmsg("column data type %s can only have storage PLAIN",
22011 : format_type_be(atttypid))));
22012 :
22013 268 : return cstorage;
22014 : }
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