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_namespace.h"
46 : #include "catalog/pg_opclass.h"
47 : #include "catalog/pg_policy.h"
48 : #include "catalog/pg_proc.h"
49 : #include "catalog/pg_publication_rel.h"
50 : #include "catalog/pg_rewrite.h"
51 : #include "catalog/pg_statistic_ext.h"
52 : #include "catalog/pg_tablespace.h"
53 : #include "catalog/pg_trigger.h"
54 : #include "catalog/pg_type.h"
55 : #include "catalog/storage.h"
56 : #include "catalog/storage_xlog.h"
57 : #include "catalog/toasting.h"
58 : #include "commands/cluster.h"
59 : #include "commands/comment.h"
60 : #include "commands/defrem.h"
61 : #include "commands/event_trigger.h"
62 : #include "commands/sequence.h"
63 : #include "commands/tablecmds.h"
64 : #include "commands/tablespace.h"
65 : #include "commands/trigger.h"
66 : #include "commands/typecmds.h"
67 : #include "commands/user.h"
68 : #include "commands/vacuum.h"
69 : #include "common/int.h"
70 : #include "executor/executor.h"
71 : #include "foreign/fdwapi.h"
72 : #include "foreign/foreign.h"
73 : #include "miscadmin.h"
74 : #include "nodes/makefuncs.h"
75 : #include "nodes/nodeFuncs.h"
76 : #include "nodes/parsenodes.h"
77 : #include "optimizer/optimizer.h"
78 : #include "parser/parse_coerce.h"
79 : #include "parser/parse_collate.h"
80 : #include "parser/parse_expr.h"
81 : #include "parser/parse_relation.h"
82 : #include "parser/parse_type.h"
83 : #include "parser/parse_utilcmd.h"
84 : #include "parser/parser.h"
85 : #include "partitioning/partbounds.h"
86 : #include "partitioning/partdesc.h"
87 : #include "pgstat.h"
88 : #include "rewrite/rewriteDefine.h"
89 : #include "rewrite/rewriteHandler.h"
90 : #include "rewrite/rewriteManip.h"
91 : #include "storage/bufmgr.h"
92 : #include "storage/lmgr.h"
93 : #include "storage/lock.h"
94 : #include "storage/predicate.h"
95 : #include "storage/smgr.h"
96 : #include "tcop/utility.h"
97 : #include "utils/acl.h"
98 : #include "utils/builtins.h"
99 : #include "utils/fmgroids.h"
100 : #include "utils/inval.h"
101 : #include "utils/lsyscache.h"
102 : #include "utils/memutils.h"
103 : #include "utils/partcache.h"
104 : #include "utils/relcache.h"
105 : #include "utils/ruleutils.h"
106 : #include "utils/snapmgr.h"
107 : #include "utils/syscache.h"
108 : #include "utils/timestamp.h"
109 : #include "utils/typcache.h"
110 : #include "utils/usercontext.h"
111 :
112 : /*
113 : * ON COMMIT action list
114 : */
115 : typedef struct OnCommitItem
116 : {
117 : Oid relid; /* relid of relation */
118 : OnCommitAction oncommit; /* what to do at end of xact */
119 :
120 : /*
121 : * If this entry was created during the current transaction,
122 : * creating_subid is the ID of the creating subxact; if created in a prior
123 : * transaction, creating_subid is zero. If deleted during the current
124 : * transaction, deleting_subid is the ID of the deleting subxact; if no
125 : * deletion request is pending, deleting_subid is zero.
126 : */
127 : SubTransactionId creating_subid;
128 : SubTransactionId deleting_subid;
129 : } OnCommitItem;
130 :
131 : static List *on_commits = NIL;
132 :
133 :
134 : /*
135 : * State information for ALTER TABLE
136 : *
137 : * The pending-work queue for an ALTER TABLE is a List of AlteredTableInfo
138 : * structs, one for each table modified by the operation (the named table
139 : * plus any child tables that are affected). We save lists of subcommands
140 : * to apply to this table (possibly modified by parse transformation steps);
141 : * these lists will be executed in Phase 2. If a Phase 3 step is needed,
142 : * necessary information is stored in the constraints and newvals lists.
143 : *
144 : * Phase 2 is divided into multiple passes; subcommands are executed in
145 : * a pass determined by subcommand type.
146 : */
147 :
148 : typedef enum AlterTablePass
149 : {
150 : AT_PASS_UNSET = -1, /* UNSET will cause ERROR */
151 : AT_PASS_DROP, /* DROP (all flavors) */
152 : AT_PASS_ALTER_TYPE, /* ALTER COLUMN TYPE */
153 : AT_PASS_ADD_COL, /* ADD COLUMN */
154 : AT_PASS_SET_EXPRESSION, /* ALTER SET EXPRESSION */
155 : AT_PASS_OLD_INDEX, /* re-add existing indexes */
156 : AT_PASS_OLD_CONSTR, /* re-add existing constraints */
157 : /* We could support a RENAME COLUMN pass here, but not currently used */
158 : AT_PASS_ADD_CONSTR, /* ADD constraints (initial examination) */
159 : AT_PASS_COL_ATTRS, /* set column attributes, eg NOT NULL */
160 : AT_PASS_ADD_INDEXCONSTR, /* ADD index-based constraints */
161 : AT_PASS_ADD_INDEX, /* ADD indexes */
162 : AT_PASS_ADD_OTHERCONSTR, /* ADD other constraints, defaults */
163 : AT_PASS_MISC, /* other stuff */
164 : } AlterTablePass;
165 :
166 : #define AT_NUM_PASSES (AT_PASS_MISC + 1)
167 :
168 : typedef struct AlteredTableInfo
169 : {
170 : /* Information saved before any work commences: */
171 : Oid relid; /* Relation to work on */
172 : char relkind; /* Its relkind */
173 : TupleDesc oldDesc; /* Pre-modification tuple descriptor */
174 :
175 : /*
176 : * Transiently set during Phase 2, normally set to NULL.
177 : *
178 : * ATRewriteCatalogs sets this when it starts, and closes when ATExecCmd
179 : * returns control. This can be exploited by ATExecCmd subroutines to
180 : * close/reopen across transaction boundaries.
181 : */
182 : Relation rel;
183 :
184 : /* Information saved by Phase 1 for Phase 2: */
185 : List *subcmds[AT_NUM_PASSES]; /* Lists of AlterTableCmd */
186 : /* Information saved by Phases 1/2 for Phase 3: */
187 : List *constraints; /* List of NewConstraint */
188 : List *newvals; /* List of NewColumnValue */
189 : List *afterStmts; /* List of utility command parsetrees */
190 : bool verify_new_notnull; /* T if we should recheck NOT NULL */
191 : int rewrite; /* Reason for forced rewrite, if any */
192 : bool chgAccessMethod; /* T if SET ACCESS METHOD is used */
193 : Oid newAccessMethod; /* new access method; 0 means no change,
194 : * if above is true */
195 : Oid newTableSpace; /* new tablespace; 0 means no change */
196 : bool chgPersistence; /* T if SET LOGGED/UNLOGGED is used */
197 : char newrelpersistence; /* if above is true */
198 : Expr *partition_constraint; /* for attach partition validation */
199 : /* true, if validating default due to some other attach/detach */
200 : bool validate_default;
201 : /* Objects to rebuild after completing ALTER TYPE operations */
202 : List *changedConstraintOids; /* OIDs of constraints to rebuild */
203 : List *changedConstraintDefs; /* string definitions of same */
204 : List *changedIndexOids; /* OIDs of indexes to rebuild */
205 : List *changedIndexDefs; /* string definitions of same */
206 : char *replicaIdentityIndex; /* index to reset as REPLICA IDENTITY */
207 : char *clusterOnIndex; /* index to use for CLUSTER */
208 : List *changedStatisticsOids; /* OIDs of statistics to rebuild */
209 : List *changedStatisticsDefs; /* string definitions of same */
210 : } AlteredTableInfo;
211 :
212 : /* Struct describing one new constraint to check in Phase 3 scan */
213 : /* Note: new not-null constraints are handled elsewhere */
214 : typedef struct NewConstraint
215 : {
216 : char *name; /* Constraint name, or NULL if none */
217 : ConstrType contype; /* CHECK or FOREIGN */
218 : Oid refrelid; /* PK rel, if FOREIGN */
219 : Oid refindid; /* OID of PK's index, if FOREIGN */
220 : bool conwithperiod; /* Whether the new FOREIGN KEY uses PERIOD */
221 : Oid conid; /* OID of pg_constraint entry, if FOREIGN */
222 : Node *qual; /* Check expr or CONSTR_FOREIGN Constraint */
223 : ExprState *qualstate; /* Execution state for CHECK expr */
224 : } NewConstraint;
225 :
226 : /*
227 : * Struct describing one new column value that needs to be computed during
228 : * Phase 3 copy (this could be either a new column with a non-null default, or
229 : * a column that we're changing the type of). Columns without such an entry
230 : * are just copied from the old table during ATRewriteTable. Note that the
231 : * expr is an expression over *old* table values, except when is_generated
232 : * is true; then it is an expression over columns of the *new* tuple.
233 : */
234 : typedef struct NewColumnValue
235 : {
236 : AttrNumber attnum; /* which column */
237 : Expr *expr; /* expression to compute */
238 : ExprState *exprstate; /* execution state */
239 : bool is_generated; /* is it a GENERATED expression? */
240 : } NewColumnValue;
241 :
242 : /*
243 : * Error-reporting support for RemoveRelations
244 : */
245 : struct dropmsgstrings
246 : {
247 : char kind;
248 : int nonexistent_code;
249 : const char *nonexistent_msg;
250 : const char *skipping_msg;
251 : const char *nota_msg;
252 : const char *drophint_msg;
253 : };
254 :
255 : static const struct dropmsgstrings dropmsgstringarray[] = {
256 : {RELKIND_RELATION,
257 : ERRCODE_UNDEFINED_TABLE,
258 : gettext_noop("table \"%s\" does not exist"),
259 : gettext_noop("table \"%s\" does not exist, skipping"),
260 : gettext_noop("\"%s\" is not a table"),
261 : gettext_noop("Use DROP TABLE to remove a table.")},
262 : {RELKIND_SEQUENCE,
263 : ERRCODE_UNDEFINED_TABLE,
264 : gettext_noop("sequence \"%s\" does not exist"),
265 : gettext_noop("sequence \"%s\" does not exist, skipping"),
266 : gettext_noop("\"%s\" is not a sequence"),
267 : gettext_noop("Use DROP SEQUENCE to remove a sequence.")},
268 : {RELKIND_VIEW,
269 : ERRCODE_UNDEFINED_TABLE,
270 : gettext_noop("view \"%s\" does not exist"),
271 : gettext_noop("view \"%s\" does not exist, skipping"),
272 : gettext_noop("\"%s\" is not a view"),
273 : gettext_noop("Use DROP VIEW to remove a view.")},
274 : {RELKIND_MATVIEW,
275 : ERRCODE_UNDEFINED_TABLE,
276 : gettext_noop("materialized view \"%s\" does not exist"),
277 : gettext_noop("materialized view \"%s\" does not exist, skipping"),
278 : gettext_noop("\"%s\" is not a materialized view"),
279 : gettext_noop("Use DROP MATERIALIZED VIEW to remove a materialized view.")},
280 : {RELKIND_INDEX,
281 : ERRCODE_UNDEFINED_OBJECT,
282 : gettext_noop("index \"%s\" does not exist"),
283 : gettext_noop("index \"%s\" does not exist, skipping"),
284 : gettext_noop("\"%s\" is not an index"),
285 : gettext_noop("Use DROP INDEX to remove an index.")},
286 : {RELKIND_COMPOSITE_TYPE,
287 : ERRCODE_UNDEFINED_OBJECT,
288 : gettext_noop("type \"%s\" does not exist"),
289 : gettext_noop("type \"%s\" does not exist, skipping"),
290 : gettext_noop("\"%s\" is not a type"),
291 : gettext_noop("Use DROP TYPE to remove a type.")},
292 : {RELKIND_FOREIGN_TABLE,
293 : ERRCODE_UNDEFINED_OBJECT,
294 : gettext_noop("foreign table \"%s\" does not exist"),
295 : gettext_noop("foreign table \"%s\" does not exist, skipping"),
296 : gettext_noop("\"%s\" is not a foreign table"),
297 : gettext_noop("Use DROP FOREIGN TABLE to remove a foreign table.")},
298 : {RELKIND_PARTITIONED_TABLE,
299 : ERRCODE_UNDEFINED_TABLE,
300 : gettext_noop("table \"%s\" does not exist"),
301 : gettext_noop("table \"%s\" does not exist, skipping"),
302 : gettext_noop("\"%s\" is not a table"),
303 : gettext_noop("Use DROP TABLE to remove a table.")},
304 : {RELKIND_PARTITIONED_INDEX,
305 : ERRCODE_UNDEFINED_OBJECT,
306 : gettext_noop("index \"%s\" does not exist"),
307 : gettext_noop("index \"%s\" does not exist, skipping"),
308 : gettext_noop("\"%s\" is not an index"),
309 : gettext_noop("Use DROP INDEX to remove an index.")},
310 : {'\0', 0, NULL, NULL, NULL, NULL}
311 : };
312 :
313 : /* communication between RemoveRelations and RangeVarCallbackForDropRelation */
314 : struct DropRelationCallbackState
315 : {
316 : /* These fields are set by RemoveRelations: */
317 : char expected_relkind;
318 : LOCKMODE heap_lockmode;
319 : /* These fields are state to track which subsidiary locks are held: */
320 : Oid heapOid;
321 : Oid partParentOid;
322 : /* These fields are passed back by RangeVarCallbackForDropRelation: */
323 : char actual_relkind;
324 : char actual_relpersistence;
325 : };
326 :
327 : /* Alter table target-type flags for ATSimplePermissions */
328 : #define ATT_TABLE 0x0001
329 : #define ATT_VIEW 0x0002
330 : #define ATT_MATVIEW 0x0004
331 : #define ATT_INDEX 0x0008
332 : #define ATT_COMPOSITE_TYPE 0x0010
333 : #define ATT_FOREIGN_TABLE 0x0020
334 : #define ATT_PARTITIONED_INDEX 0x0040
335 : #define ATT_SEQUENCE 0x0080
336 : #define ATT_PARTITIONED_TABLE 0x0100
337 :
338 : /*
339 : * ForeignTruncateInfo
340 : *
341 : * Information related to truncation of foreign tables. This is used for
342 : * the elements in a hash table. It uses the server OID as lookup key,
343 : * and includes a per-server list of all foreign tables involved in the
344 : * truncation.
345 : */
346 : typedef struct ForeignTruncateInfo
347 : {
348 : Oid serverid;
349 : List *rels;
350 : } ForeignTruncateInfo;
351 :
352 : /* Partial or complete FK creation in addFkConstraint() */
353 : typedef enum addFkConstraintSides
354 : {
355 : addFkReferencedSide,
356 : addFkReferencingSide,
357 : addFkBothSides,
358 : } addFkConstraintSides;
359 :
360 : /*
361 : * Partition tables are expected to be dropped when the parent partitioned
362 : * table gets dropped. Hence for partitioning we use AUTO dependency.
363 : * Otherwise, for regular inheritance use NORMAL dependency.
364 : */
365 : #define child_dependency_type(child_is_partition) \
366 : ((child_is_partition) ? DEPENDENCY_AUTO : DEPENDENCY_NORMAL)
367 :
368 : static void truncate_check_rel(Oid relid, Form_pg_class reltuple);
369 : static void truncate_check_perms(Oid relid, Form_pg_class reltuple);
370 : static void truncate_check_activity(Relation rel);
371 : static void RangeVarCallbackForTruncate(const RangeVar *relation,
372 : Oid relId, Oid oldRelId, void *arg);
373 : static List *MergeAttributes(List *columns, const List *supers, char relpersistence,
374 : bool is_partition, List **supconstr,
375 : List **supnotnulls);
376 : static List *MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced);
377 : static void MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef);
378 : static ColumnDef *MergeInheritedAttribute(List *inh_columns, int exist_attno, const ColumnDef *newdef);
379 : static void MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition);
380 : static void MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel);
381 : static void StoreCatalogInheritance(Oid relationId, List *supers,
382 : bool child_is_partition);
383 : static void StoreCatalogInheritance1(Oid relationId, Oid parentOid,
384 : int32 seqNumber, Relation inhRelation,
385 : bool child_is_partition);
386 : static int findAttrByName(const char *attributeName, const List *columns);
387 : static void AlterIndexNamespaces(Relation classRel, Relation rel,
388 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved);
389 : static void AlterSeqNamespaces(Relation classRel, Relation rel,
390 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
391 : LOCKMODE lockmode);
392 : static ObjectAddress ATExecAlterConstraint(List **wqueue, Relation rel,
393 : ATAlterConstraint *cmdcon,
394 : bool recurse, LOCKMODE lockmode);
395 : static bool ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon, Relation conrel,
396 : Relation tgrel, Relation rel, HeapTuple contuple,
397 : bool recurse, LOCKMODE lockmode);
398 : static bool ATExecAlterConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
399 : Relation conrel, Relation tgrel,
400 : Oid fkrelid, Oid pkrelid,
401 : HeapTuple contuple, LOCKMODE lockmode,
402 : Oid ReferencedParentDelTrigger,
403 : Oid ReferencedParentUpdTrigger,
404 : Oid ReferencingParentInsTrigger,
405 : Oid ReferencingParentUpdTrigger);
406 : static bool ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
407 : Relation conrel, Relation tgrel, Relation rel,
408 : HeapTuple contuple, bool recurse,
409 : List **otherrelids, LOCKMODE lockmode);
410 : static bool ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
411 : Relation conrel, Relation rel,
412 : HeapTuple contuple, LOCKMODE lockmode);
413 : static void AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
414 : bool deferrable, bool initdeferred,
415 : List **otherrelids);
416 : static void AlterConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
417 : Relation conrel, Relation tgrel,
418 : Oid fkrelid, Oid pkrelid,
419 : HeapTuple contuple, LOCKMODE lockmode,
420 : Oid ReferencedParentDelTrigger,
421 : Oid ReferencedParentUpdTrigger,
422 : Oid ReferencingParentInsTrigger,
423 : Oid ReferencingParentUpdTrigger);
424 : static void AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
425 : Relation conrel, Relation tgrel, Relation rel,
426 : HeapTuple contuple, bool recurse,
427 : List **otherrelids, LOCKMODE lockmode);
428 : static void AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
429 : HeapTuple contuple);
430 : static ObjectAddress ATExecValidateConstraint(List **wqueue,
431 : Relation rel, char *constrName,
432 : bool recurse, bool recursing, LOCKMODE lockmode);
433 : static void QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation rel,
434 : HeapTuple contuple, LOCKMODE lockmode);
435 : static void QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
436 : char *constrName, HeapTuple contuple,
437 : bool recurse, bool recursing, LOCKMODE lockmode);
438 : static void QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
439 : HeapTuple contuple, bool recurse, bool recursing,
440 : LOCKMODE lockmode);
441 : static int transformColumnNameList(Oid relId, List *colList,
442 : int16 *attnums, Oid *atttypids, Oid *attcollids);
443 : static int transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
444 : List **attnamelist,
445 : int16 *attnums, Oid *atttypids, Oid *attcollids,
446 : Oid *opclasses, bool *pk_has_without_overlaps);
447 : static Oid transformFkeyCheckAttrs(Relation pkrel,
448 : int numattrs, int16 *attnums,
449 : bool with_period, Oid *opclasses,
450 : bool *pk_has_without_overlaps);
451 : static void checkFkeyPermissions(Relation rel, int16 *attnums, int natts);
452 : static CoercionPathType findFkeyCast(Oid targetTypeId, Oid sourceTypeId,
453 : Oid *funcid);
454 : static void validateForeignKeyConstraint(char *conname,
455 : Relation rel, Relation pkrel,
456 : Oid pkindOid, Oid constraintOid, bool hasperiod);
457 : static void CheckAlterTableIsSafe(Relation rel);
458 : static void ATController(AlterTableStmt *parsetree,
459 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
460 : AlterTableUtilityContext *context);
461 : static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
462 : bool recurse, bool recursing, LOCKMODE lockmode,
463 : AlterTableUtilityContext *context);
464 : static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
465 : AlterTableUtilityContext *context);
466 : static void ATExecCmd(List **wqueue, AlteredTableInfo *tab,
467 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
468 : AlterTableUtilityContext *context);
469 : static AlterTableCmd *ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab,
470 : Relation rel, AlterTableCmd *cmd,
471 : bool recurse, LOCKMODE lockmode,
472 : AlterTablePass cur_pass,
473 : AlterTableUtilityContext *context);
474 : static void ATRewriteTables(AlterTableStmt *parsetree,
475 : List **wqueue, LOCKMODE lockmode,
476 : AlterTableUtilityContext *context);
477 : static void ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap);
478 : static AlteredTableInfo *ATGetQueueEntry(List **wqueue, Relation rel);
479 : static void ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets);
480 : static void ATSimpleRecursion(List **wqueue, Relation rel,
481 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
482 : AlterTableUtilityContext *context);
483 : static void ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode);
484 : static void ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
485 : LOCKMODE lockmode,
486 : AlterTableUtilityContext *context);
487 : static List *find_typed_table_dependencies(Oid typeOid, const char *typeName,
488 : DropBehavior behavior);
489 : static void ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
490 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
491 : AlterTableUtilityContext *context);
492 : static ObjectAddress ATExecAddColumn(List **wqueue, AlteredTableInfo *tab,
493 : Relation rel, AlterTableCmd **cmd,
494 : bool recurse, bool recursing,
495 : LOCKMODE lockmode, AlterTablePass cur_pass,
496 : AlterTableUtilityContext *context);
497 : static bool check_for_column_name_collision(Relation rel, const char *colname,
498 : bool if_not_exists);
499 : static void add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid);
500 : static void add_column_collation_dependency(Oid relid, int32 attnum, Oid collid);
501 : static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
502 : LOCKMODE lockmode);
503 : static void set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
504 : bool is_valid, bool queue_validation);
505 : static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
506 : char *conName, char *colName,
507 : bool recurse, bool recursing,
508 : LOCKMODE lockmode);
509 : static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
510 : static bool ConstraintImpliedByRelConstraint(Relation scanrel,
511 : List *testConstraint, List *provenConstraint);
512 : static ObjectAddress ATExecColumnDefault(Relation rel, const char *colName,
513 : Node *newDefault, LOCKMODE lockmode);
514 : static ObjectAddress ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
515 : Node *newDefault);
516 : static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,
517 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
518 : static ObjectAddress ATExecSetIdentity(Relation rel, const char *colName,
519 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing);
520 : static ObjectAddress ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
521 : bool recurse, bool recursing);
522 : static ObjectAddress ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
523 : Node *newExpr, LOCKMODE lockmode);
524 : static void ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode);
525 : static ObjectAddress ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode);
526 : static ObjectAddress ATExecSetStatistics(Relation rel, const char *colName, int16 colNum,
527 : Node *newValue, LOCKMODE lockmode);
528 : static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
529 : Node *options, bool isReset, LOCKMODE lockmode);
530 : static ObjectAddress ATExecSetStorage(Relation rel, const char *colName,
531 : Node *newValue, LOCKMODE lockmode);
532 : static void ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
533 : AlterTableCmd *cmd, LOCKMODE lockmode,
534 : AlterTableUtilityContext *context);
535 : static ObjectAddress ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
536 : DropBehavior behavior,
537 : bool recurse, bool recursing,
538 : bool missing_ok, LOCKMODE lockmode,
539 : ObjectAddresses *addrs);
540 : static void ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
541 : bool recurse, LOCKMODE lockmode,
542 : AlterTableUtilityContext *context);
543 : static void verifyNotNullPKCompatible(HeapTuple tuple, const char *colname);
544 : static ObjectAddress ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
545 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
546 : static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
547 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode);
548 : static ObjectAddress ATExecAddConstraint(List **wqueue,
549 : AlteredTableInfo *tab, Relation rel,
550 : Constraint *newConstraint, bool recurse, bool is_readd,
551 : LOCKMODE lockmode);
552 : static char *ChooseForeignKeyConstraintNameAddition(List *colnames);
553 : static ObjectAddress ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
554 : IndexStmt *stmt, LOCKMODE lockmode);
555 : static ObjectAddress ATAddCheckNNConstraint(List **wqueue,
556 : AlteredTableInfo *tab, Relation rel,
557 : Constraint *constr,
558 : bool recurse, bool recursing, bool is_readd,
559 : LOCKMODE lockmode);
560 : static ObjectAddress ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab,
561 : Relation rel, Constraint *fkconstraint,
562 : bool recurse, bool recursing,
563 : LOCKMODE lockmode);
564 : static int validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
565 : int numfksetcols, int16 *fksetcolsattnums,
566 : List *fksetcols);
567 : static ObjectAddress addFkConstraint(addFkConstraintSides fkside,
568 : char *constraintname,
569 : Constraint *fkconstraint, Relation rel,
570 : Relation pkrel, Oid indexOid,
571 : Oid parentConstr,
572 : int numfks, int16 *pkattnum, int16 *fkattnum,
573 : Oid *pfeqoperators, Oid *ppeqoperators,
574 : Oid *ffeqoperators, int numfkdelsetcols,
575 : int16 *fkdelsetcols, bool is_internal,
576 : bool with_period);
577 : static void addFkRecurseReferenced(Constraint *fkconstraint,
578 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
579 : int numfks, int16 *pkattnum, int16 *fkattnum,
580 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
581 : int numfkdelsetcols, int16 *fkdelsetcols,
582 : bool old_check_ok,
583 : Oid parentDelTrigger, Oid parentUpdTrigger,
584 : bool with_period);
585 : static void addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint,
586 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
587 : int numfks, int16 *pkattnum, int16 *fkattnum,
588 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
589 : int numfkdelsetcols, int16 *fkdelsetcols,
590 : bool old_check_ok, LOCKMODE lockmode,
591 : Oid parentInsTrigger, Oid parentUpdTrigger,
592 : bool with_period);
593 : static void CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
594 : Relation partitionRel);
595 : static void CloneFkReferenced(Relation parentRel, Relation partitionRel);
596 : static void CloneFkReferencing(List **wqueue, Relation parentRel,
597 : Relation partRel);
598 : static void createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
599 : Constraint *fkconstraint, Oid constraintOid,
600 : Oid indexOid,
601 : Oid parentInsTrigger, Oid parentUpdTrigger,
602 : Oid *insertTrigOid, Oid *updateTrigOid);
603 : static void createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid,
604 : Constraint *fkconstraint, Oid constraintOid,
605 : Oid indexOid,
606 : Oid parentDelTrigger, Oid parentUpdTrigger,
607 : Oid *deleteTrigOid, Oid *updateTrigOid);
608 : static bool tryAttachPartitionForeignKey(List **wqueue,
609 : ForeignKeyCacheInfo *fk,
610 : Relation partition,
611 : Oid parentConstrOid, int numfks,
612 : AttrNumber *mapped_conkey, AttrNumber *confkey,
613 : Oid *conpfeqop,
614 : Oid parentInsTrigger,
615 : Oid parentUpdTrigger,
616 : Relation trigrel);
617 : static void AttachPartitionForeignKey(List **wqueue, Relation partition,
618 : Oid partConstrOid, Oid parentConstrOid,
619 : Oid parentInsTrigger, Oid parentUpdTrigger,
620 : Relation trigrel);
621 : static void RemoveInheritedConstraint(Relation conrel, Relation trigrel,
622 : Oid conoid, Oid conrelid);
623 : static void DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid,
624 : Oid confrelid, Oid conrelid);
625 : static void GetForeignKeyActionTriggers(Relation trigrel,
626 : Oid conoid, Oid confrelid, Oid conrelid,
627 : Oid *deleteTriggerOid,
628 : Oid *updateTriggerOid);
629 : static void GetForeignKeyCheckTriggers(Relation trigrel,
630 : Oid conoid, Oid confrelid, Oid conrelid,
631 : Oid *insertTriggerOid,
632 : Oid *updateTriggerOid);
633 : static void ATExecDropConstraint(Relation rel, const char *constrName,
634 : DropBehavior behavior, bool recurse,
635 : bool missing_ok, LOCKMODE lockmode);
636 : static ObjectAddress dropconstraint_internal(Relation rel,
637 : HeapTuple constraintTup, DropBehavior behavior,
638 : bool recurse, bool recursing,
639 : bool missing_ok, LOCKMODE lockmode);
640 : static void ATPrepAlterColumnType(List **wqueue,
641 : AlteredTableInfo *tab, Relation rel,
642 : bool recurse, bool recursing,
643 : AlterTableCmd *cmd, LOCKMODE lockmode,
644 : AlterTableUtilityContext *context);
645 : static bool ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno);
646 : static ObjectAddress ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
647 : AlterTableCmd *cmd, LOCKMODE lockmode);
648 : static void RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
649 : Relation rel, AttrNumber attnum, const char *colName);
650 : static void RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab);
651 : static void RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab);
652 : static void RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab);
653 : static void ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab,
654 : LOCKMODE lockmode);
655 : static void ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId,
656 : char *cmd, List **wqueue, LOCKMODE lockmode,
657 : bool rewrite);
658 : static void RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass,
659 : Oid objid, Relation rel, List *domname,
660 : const char *conname);
661 : static void TryReuseIndex(Oid oldId, IndexStmt *stmt);
662 : static void TryReuseForeignKey(Oid oldId, Constraint *con);
663 : static ObjectAddress ATExecAlterColumnGenericOptions(Relation rel, const char *colName,
664 : List *options, LOCKMODE lockmode);
665 : static void change_owner_fix_column_acls(Oid relationOid,
666 : Oid oldOwnerId, Oid newOwnerId);
667 : static void change_owner_recurse_to_sequences(Oid relationOid,
668 : Oid newOwnerId, LOCKMODE lockmode);
669 : static ObjectAddress ATExecClusterOn(Relation rel, const char *indexName,
670 : LOCKMODE lockmode);
671 : static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
672 : static void ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname);
673 : static void ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId);
674 : static void ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel,
675 : bool toLogged);
676 : static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
677 : const char *tablespacename, LOCKMODE lockmode);
678 : static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
679 : static void ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace);
680 : static void ATExecSetRelOptions(Relation rel, List *defList,
681 : AlterTableType operation,
682 : LOCKMODE lockmode);
683 : static void ATExecEnableDisableTrigger(Relation rel, const char *trigname,
684 : char fires_when, bool skip_system, bool recurse,
685 : LOCKMODE lockmode);
686 : static void ATExecEnableDisableRule(Relation rel, const char *rulename,
687 : char fires_when, LOCKMODE lockmode);
688 : static void ATPrepAddInherit(Relation child_rel);
689 : static ObjectAddress ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode);
690 : static ObjectAddress ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode);
691 : static void drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
692 : DependencyType deptype);
693 : static ObjectAddress ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode);
694 : static void ATExecDropOf(Relation rel, LOCKMODE lockmode);
695 : static void ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode);
696 : static void ATExecGenericOptions(Relation rel, List *options);
697 : static void ATExecSetRowSecurity(Relation rel, bool rls);
698 : static void ATExecForceNoForceRowSecurity(Relation rel, bool force_rls);
699 : static ObjectAddress ATExecSetCompression(Relation rel,
700 : const char *column, Node *newValue, LOCKMODE lockmode);
701 :
702 : static void index_copy_data(Relation rel, RelFileLocator newrlocator);
703 : static const char *storage_name(char c);
704 :
705 : static void RangeVarCallbackForDropRelation(const RangeVar *rel, Oid relOid,
706 : Oid oldRelOid, void *arg);
707 : static void RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid,
708 : Oid oldrelid, void *arg);
709 : static PartitionSpec *transformPartitionSpec(Relation rel, PartitionSpec *partspec);
710 : static void ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
711 : List **partexprs, Oid *partopclass, Oid *partcollation,
712 : PartitionStrategy strategy);
713 : static void CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition);
714 : static void RemoveInheritance(Relation child_rel, Relation parent_rel,
715 : bool expect_detached);
716 : static ObjectAddress ATExecAttachPartition(List **wqueue, Relation rel,
717 : PartitionCmd *cmd,
718 : AlterTableUtilityContext *context);
719 : static void AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel);
720 : static void QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
721 : List *partConstraint,
722 : bool validate_default);
723 : static void CloneRowTriggersToPartition(Relation parent, Relation partition);
724 : static void DetachAddConstraintIfNeeded(List **wqueue, Relation partRel);
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 63320 : 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 63320 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
784 : Oid ofTypeId;
785 : ObjectAddress address;
786 : LOCKMODE parentLockmode;
787 63320 : 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 63320 : strlcpy(relname, stmt->relation->relname, NAMEDATALEN);
794 :
795 : /*
796 : * Check consistency of arguments
797 : */
798 63320 : 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 63308 : if (stmt->partspec != NULL)
805 : {
806 5120 : if (relkind != RELKIND_RELATION)
807 0 : elog(ERROR, "unexpected relkind: %d", (int) relkind);
808 :
809 5120 : relkind = RELKIND_PARTITIONED_TABLE;
810 5120 : partitioned = true;
811 : }
812 : else
813 58188 : partitioned = false;
814 :
815 63308 : if (relkind == RELKIND_PARTITIONED_TABLE &&
816 5120 : 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 63302 : 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 63302 : if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
836 3126 : && 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 63302 : parentLockmode = (stmt->partbound != NULL ? AccessExclusiveLock :
858 : ShareUpdateExclusiveLock);
859 :
860 : /* Determine the list of OIDs of the parents. */
861 63302 : inheritOids = NIL;
862 73820 : foreach(listptr, stmt->inhRelations)
863 : {
864 10518 : RangeVar *rv = (RangeVar *) lfirst(listptr);
865 : Oid parentOid;
866 :
867 10518 : parentOid = RangeVarGetRelid(rv, parentLockmode, false);
868 :
869 : /*
870 : * Reject duplications in the list of parents.
871 : */
872 10518 : 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 10518 : 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 63302 : if (stmt->tablespacename)
886 : {
887 118 : tablespaceId = get_tablespace_oid(stmt->tablespacename, false);
888 :
889 112 : 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 63184 : else if (stmt->partbound)
895 : {
896 : Assert(list_length(inheritOids) == 1);
897 7922 : tablespaceId = get_rel_tablespace(linitial_oid(inheritOids));
898 : }
899 : else
900 55262 : tablespaceId = InvalidOid;
901 :
902 : /* still nothing? use the default */
903 63290 : if (!OidIsValid(tablespaceId))
904 63162 : tablespaceId = GetDefaultTablespace(stmt->relation->relpersistence,
905 : partitioned);
906 :
907 : /* Check permissions except when using database's default */
908 63284 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
909 : {
910 : AclResult aclresult;
911 :
912 146 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(),
913 : ACL_CREATE);
914 146 : 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 63278 : 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 63260 : if (!OidIsValid(ownerId))
927 62976 : ownerId = GetUserId();
928 :
929 : /*
930 : * Parse and validate reloptions, if any.
931 : */
932 63260 : reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
933 : true, false);
934 :
935 63242 : switch (relkind)
936 : {
937 16366 : case RELKIND_VIEW:
938 16366 : (void) view_reloptions(reloptions, true);
939 16348 : break;
940 5096 : case RELKIND_PARTITIONED_TABLE:
941 5096 : (void) partitioned_table_reloptions(reloptions, true);
942 5090 : break;
943 41780 : default:
944 41780 : (void) heap_reloptions(relkind, reloptions, true);
945 : }
946 :
947 63122 : if (stmt->ofTypename)
948 : {
949 : AclResult aclresult;
950 :
951 98 : ofTypeId = typenameTypeId(NULL, stmt->ofTypename);
952 :
953 98 : aclresult = object_aclcheck(TypeRelationId, ofTypeId, GetUserId(), ACL_USAGE);
954 98 : if (aclresult != ACLCHECK_OK)
955 6 : aclcheck_error_type(aclresult, ofTypeId);
956 : }
957 : else
958 63024 : 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 62876 : stmt->tableElts =
966 63116 : MergeAttributes(stmt->tableElts, inheritOids,
967 63116 : stmt->relation->relpersistence,
968 63116 : 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 62876 : 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 62828 : rawDefaults = NIL;
988 62828 : cookedDefaults = NIL;
989 62828 : attnum = 0;
990 :
991 317138 : foreach(listptr, stmt->tableElts)
992 : {
993 254310 : ColumnDef *colDef = lfirst(listptr);
994 :
995 254310 : attnum++;
996 254310 : if (colDef->raw_default != NULL)
997 : {
998 : RawColumnDefault *rawEnt;
999 :
1000 : Assert(colDef->cooked_default == NULL);
1001 :
1002 3336 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
1003 3336 : rawEnt->attnum = attnum;
1004 3336 : rawEnt->raw_default = colDef->raw_default;
1005 3336 : rawEnt->generated = colDef->generated;
1006 3336 : rawDefaults = lappend(rawDefaults, rawEnt);
1007 : }
1008 250974 : else if (colDef->cooked_default != NULL)
1009 : {
1010 : CookedConstraint *cooked;
1011 :
1012 404 : cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
1013 404 : cooked->contype = CONSTR_DEFAULT;
1014 404 : cooked->conoid = InvalidOid; /* until created */
1015 404 : cooked->name = NULL;
1016 404 : cooked->attnum = attnum;
1017 404 : cooked->expr = colDef->cooked_default;
1018 404 : cooked->is_enforced = true;
1019 404 : cooked->skip_validation = false;
1020 404 : cooked->is_local = true; /* not used for defaults */
1021 404 : cooked->inhcount = 0; /* ditto */
1022 404 : cooked->is_no_inherit = false;
1023 404 : 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 62828 : 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 62706 : else if (RELKIND_HAS_TABLE_AM(relkind) || relkind == RELKIND_PARTITIONED_TABLE)
1038 : {
1039 39478 : if (stmt->partbound)
1040 : {
1041 : Assert(list_length(inheritOids) == 1);
1042 7740 : accessMethodId = get_rel_relam(linitial_oid(inheritOids));
1043 : }
1044 :
1045 39478 : if (RELKIND_HAS_TABLE_AM(relkind) && !OidIsValid(accessMethodId))
1046 34374 : 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 62810 : 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 62810 : 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 62768 : 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 62768 : 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 62768 : if (rawDefaults)
1104 2818 : AddRelationNewConstraints(rel, rawDefaults, NIL,
1105 : true, true, false, queryString);
1106 :
1107 : /*
1108 : * Make column generation expressions visible for use by partitioning.
1109 : */
1110 62606 : CommandCounterIncrement();
1111 :
1112 : /* Process and store partition bound, if any. */
1113 62606 : if (stmt->partbound)
1114 : {
1115 : PartitionBoundSpec *bound;
1116 : ParseState *pstate;
1117 7844 : Oid parentId = linitial_oid(inheritOids),
1118 : defaultPartOid;
1119 : Relation parent,
1120 7844 : defaultRel = NULL;
1121 : ParseNamespaceItem *nsitem;
1122 :
1123 : /* Already have strong enough lock on the parent */
1124 7844 : 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 7844 : 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 7826 : get_default_oid_from_partdesc(RelationGetPartitionDesc(parent,
1157 : true));
1158 7826 : if (OidIsValid(defaultPartOid))
1159 378 : defaultRel = table_open(defaultPartOid, AccessExclusiveLock);
1160 :
1161 : /* Transform the bound values */
1162 7826 : pstate = make_parsestate(NULL);
1163 7826 : 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 7826 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
1171 : NULL, false, false);
1172 7826 : addNSItemToQuery(pstate, nsitem, false, true, true);
1173 :
1174 7826 : 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 7622 : 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 7508 : 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 7490 : StorePartitionBound(rel, parent, bound);
1198 :
1199 7490 : table_close(parent, NoLock);
1200 : }
1201 :
1202 : /* Store inheritance information for new rel. */
1203 62252 : 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 62252 : 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 5090 : List *partexprs = NIL;
1217 :
1218 5090 : pstate = make_parsestate(NULL);
1219 5090 : pstate->p_sourcetext = queryString;
1220 :
1221 5090 : partnatts = list_length(stmt->partspec->partParams);
1222 :
1223 : /* Protect fixed-size arrays here and in executor */
1224 5090 : 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 5090 : stmt->partspec = transformPartitionSpec(rel, stmt->partspec);
1237 :
1238 5060 : ComputePartitionAttrs(pstate, rel, stmt->partspec->partParams,
1239 : partattrs, &partexprs, partopclass,
1240 5060 : partcollation, stmt->partspec->strategy);
1241 :
1242 4964 : StorePartitionKey(rel, stmt->partspec->strategy, partnatts, partattrs,
1243 : partexprs,
1244 : partopclass, partcollation);
1245 :
1246 : /* make it all visible */
1247 4964 : 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 62126 : if (stmt->partbound)
1258 : {
1259 7484 : 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 7484 : parent = table_open(parentId, NoLock);
1266 7484 : idxlist = RelationGetIndexList(parent);
1267 :
1268 : /*
1269 : * For each index in the parent table, create one in the partition
1270 : */
1271 8874 : foreach(cell, idxlist)
1272 : {
1273 1408 : Relation idxRel = index_open(lfirst_oid(cell), AccessShareLock);
1274 : AttrMap *attmap;
1275 : IndexStmt *idxstmt;
1276 : Oid constraintOid;
1277 :
1278 1408 : 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 1372 : attmap = build_attrmap_by_name(RelationGetDescr(rel),
1295 : RelationGetDescr(parent),
1296 : false);
1297 : idxstmt =
1298 1372 : generateClonedIndexStmt(NULL, idxRel,
1299 : attmap, &constraintOid);
1300 1372 : DefineIndex(RelationGetRelid(rel),
1301 : idxstmt,
1302 : InvalidOid,
1303 : RelationGetRelid(idxRel),
1304 : constraintOid,
1305 : -1,
1306 : false, false, false, false, false);
1307 :
1308 1366 : index_close(idxRel, AccessShareLock);
1309 : }
1310 :
1311 7466 : list_free(idxlist);
1312 :
1313 : /*
1314 : * If there are any row-level triggers, clone them to the new
1315 : * partition.
1316 : */
1317 7466 : if (parent->trigdesc != NULL)
1318 420 : 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 7466 : CloneForeignKeyConstraints(NULL, parent, rel);
1325 :
1326 7466 : 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 62108 : if (stmt->constraints)
1335 778 : 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 62078 : nncols = AddRelationNotNullConstraints(rel, stmt->nnconstraints,
1345 : old_notnulls);
1346 139464 : foreach_int(attrnum, nncols)
1347 15464 : set_attnotnull(NULL, rel, attrnum, true, false);
1348 :
1349 62000 : 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 62000 : relation_close(rel, NoLock);
1356 :
1357 62000 : 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 65838 : 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 65838 : natts = list_length(columns);
1386 65838 : desc = CreateTemplateTupleDesc(natts);
1387 :
1388 65838 : attnum = 0;
1389 :
1390 323374 : foreach(l, columns)
1391 : {
1392 257596 : 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 257596 : attnum++;
1402 :
1403 257596 : attname = entry->colname;
1404 257596 : typenameTypeIdAndMod(NULL, entry->typeName, &atttypid, &atttypmod);
1405 :
1406 257596 : aclresult = object_aclcheck(TypeRelationId, atttypid, GetUserId(), ACL_USAGE);
1407 257596 : if (aclresult != ACLCHECK_OK)
1408 42 : aclcheck_error_type(aclresult, atttypid);
1409 :
1410 257554 : attcollation = GetColumnDefCollation(NULL, entry, atttypid);
1411 257554 : attdim = list_length(entry->typeName->arrayBounds);
1412 257554 : if (attdim > PG_INT16_MAX)
1413 0 : ereport(ERROR,
1414 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
1415 : errmsg("too many array dimensions"));
1416 :
1417 257554 : 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 257554 : TupleDescInitEntry(desc, attnum, attname,
1424 : atttypid, atttypmod, attdim);
1425 257554 : att = TupleDescAttr(desc, attnum - 1);
1426 :
1427 : /* Override TupleDescInitEntry's settings as requested */
1428 257554 : TupleDescInitEntryCollation(desc, attnum, attcollation);
1429 :
1430 : /* Fill in additional stuff not handled by TupleDescInitEntry */
1431 257554 : att->attnotnull = entry->is_not_null;
1432 257554 : att->attislocal = entry->is_local;
1433 257554 : att->attinhcount = entry->inhcount;
1434 257554 : att->attidentity = entry->identity;
1435 257554 : att->attgenerated = entry->generated;
1436 257554 : att->attcompression = GetAttributeCompression(att->atttypid, entry->compression);
1437 257542 : if (entry->storage)
1438 20126 : att->attstorage = entry->storage;
1439 237416 : else if (entry->storage_name)
1440 20 : att->attstorage = GetAttributeStorage(att->atttypid, entry->storage_name);
1441 :
1442 257536 : populate_compact_attribute(desc, attnum - 1);
1443 : }
1444 :
1445 65778 : 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 1082 : DropErrorMsgNonExistent(RangeVar *rel, char rightkind, bool missing_ok)
1454 : {
1455 : const struct dropmsgstrings *rentry;
1456 :
1457 1202 : 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 1360 : for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
1476 : {
1477 1360 : if (rentry->kind == rightkind)
1478 : {
1479 1040 : 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 902 : ereport(NOTICE, (errmsg(rentry->skipping_msg, rel->relname)));
1488 902 : 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 17068 : RemoveRelations(DropStmt *drop)
1529 : {
1530 : ObjectAddresses *objects;
1531 : char relkind;
1532 : ListCell *cell;
1533 17068 : int flags = 0;
1534 17068 : LOCKMODE lockmode = AccessExclusiveLock;
1535 :
1536 : /* DROP CONCURRENTLY uses a weaker lock, and has some restrictions */
1537 17068 : 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 182 : lockmode = ShareUpdateExclusiveLock;
1545 : Assert(drop->removeType == OBJECT_INDEX);
1546 182 : 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 176 : 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 17062 : switch (drop->removeType)
1564 : {
1565 14804 : case OBJECT_TABLE:
1566 14804 : relkind = RELKIND_RELATION;
1567 14804 : break;
1568 :
1569 864 : case OBJECT_INDEX:
1570 864 : relkind = RELKIND_INDEX;
1571 864 : break;
1572 :
1573 170 : case OBJECT_SEQUENCE:
1574 170 : relkind = RELKIND_SEQUENCE;
1575 170 : break;
1576 :
1577 936 : case OBJECT_VIEW:
1578 936 : relkind = RELKIND_VIEW;
1579 936 : break;
1580 :
1581 126 : case OBJECT_MATVIEW:
1582 126 : relkind = RELKIND_MATVIEW;
1583 126 : break;
1584 :
1585 162 : case OBJECT_FOREIGN_TABLE:
1586 162 : relkind = RELKIND_FOREIGN_TABLE;
1587 162 : 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 17062 : objects = new_object_addresses();
1598 :
1599 38048 : foreach(cell, drop->objects)
1600 : {
1601 21150 : 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 21150 : AcceptInvalidationMessages();
1617 :
1618 : /* Look up the appropriate relation using namespace search. */
1619 21150 : state.expected_relkind = relkind;
1620 42300 : state.heap_lockmode = drop->concurrent ?
1621 21150 : ShareUpdateExclusiveLock : AccessExclusiveLock;
1622 : /* We must initialize these fields to show that no locks are held: */
1623 21150 : state.heapOid = InvalidOid;
1624 21150 : state.partParentOid = InvalidOid;
1625 :
1626 21150 : relOid = RangeVarGetRelidExtended(rel, lockmode, RVR_MISSING_OK,
1627 : RangeVarCallbackForDropRelation,
1628 : &state);
1629 :
1630 : /* Not there? */
1631 21130 : if (!OidIsValid(relOid))
1632 : {
1633 1082 : DropErrorMsgNonExistent(rel, relkind, drop->missing_ok);
1634 944 : 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 20048 : if (drop->concurrent &&
1642 170 : state.actual_relpersistence != RELPERSISTENCE_TEMP)
1643 : {
1644 : Assert(list_length(drop->objects) == 1 &&
1645 : drop->removeType == OBJECT_INDEX);
1646 152 : flags |= PERFORM_DELETION_CONCURRENTLY;
1647 : }
1648 :
1649 : /*
1650 : * Concurrent index drop cannot be used with partitioned indexes,
1651 : * either.
1652 : */
1653 20048 : if ((flags & PERFORM_DELETION_CONCURRENTLY) != 0 &&
1654 152 : 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 20042 : 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 20042 : obj.classId = RelationRelationId;
1674 20042 : obj.objectId = relOid;
1675 20042 : obj.objectSubId = 0;
1676 :
1677 20042 : add_exact_object_address(&obj, objects);
1678 : }
1679 :
1680 16898 : performMultipleDeletions(objects, drop->behavior, flags);
1681 :
1682 16756 : free_object_addresses(objects);
1683 16756 : }
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 21492 : 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 21492 : bool invalid_system_index = false;
1702 :
1703 21492 : state = (struct DropRelationCallbackState *) arg;
1704 21492 : 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 21492 : 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 21492 : 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 21492 : if (!OidIsValid(relOid))
1730 1086 : return;
1731 :
1732 20406 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
1733 20406 : if (!HeapTupleIsValid(tuple))
1734 0 : return; /* concurrently dropped, so nothing to do */
1735 20406 : classform = (Form_pg_class) GETSTRUCT(tuple);
1736 20406 : is_partition = classform->relispartition;
1737 :
1738 : /* Pass back some data to save lookups in RemoveRelations */
1739 20406 : state->actual_relkind = classform->relkind;
1740 20406 : 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 20406 : if (classform->relkind == RELKIND_PARTITIONED_TABLE)
1751 2928 : expected_relkind = RELKIND_RELATION;
1752 17478 : else if (classform->relkind == RELKIND_PARTITIONED_INDEX)
1753 84 : expected_relkind = RELKIND_INDEX;
1754 : else
1755 17394 : expected_relkind = classform->relkind;
1756 :
1757 20406 : 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 20406 : 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 20388 : 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 20388 : 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 20386 : 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 20386 : if (expected_relkind == RELKIND_INDEX &&
1814 : relOid != oldRelOid)
1815 : {
1816 852 : state->heapOid = IndexGetRelation(relOid, true);
1817 852 : if (OidIsValid(state->heapOid))
1818 852 : 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 20386 : if (is_partition && relOid != oldRelOid)
1828 : {
1829 612 : state->partParentOid = get_partition_parent(relOid, true);
1830 612 : if (OidIsValid(state->partParentOid))
1831 612 : 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 2936 : ExecuteTruncate(TruncateStmt *stmt)
1852 : {
1853 2936 : List *rels = NIL;
1854 2936 : List *relids = NIL;
1855 2936 : List *relids_logged = NIL;
1856 : ListCell *cell;
1857 :
1858 : /*
1859 : * Open, exclusive-lock, and check all the explicitly-specified relations
1860 : */
1861 6084 : foreach(cell, stmt->relations)
1862 : {
1863 3204 : RangeVar *rv = lfirst(cell);
1864 : Relation rel;
1865 3204 : bool recurse = rv->inh;
1866 : Oid myrelid;
1867 3204 : LOCKMODE lockmode = AccessExclusiveLock;
1868 :
1869 3204 : myrelid = RangeVarGetRelidExtended(rv, lockmode,
1870 : 0, RangeVarCallbackForTruncate,
1871 : NULL);
1872 :
1873 : /* don't throw error for "TRUNCATE foo, foo" */
1874 3166 : if (list_member_oid(relids, myrelid))
1875 2 : continue;
1876 :
1877 : /* open the relation, we already hold a lock on it */
1878 3164 : 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 3164 : truncate_check_activity(rel);
1885 :
1886 3158 : rels = lappend(rels, rel);
1887 3158 : relids = lappend_oid(relids, myrelid);
1888 :
1889 : /* Log this relation only if needed for logical decoding */
1890 3158 : if (RelationIsLogicallyLogged(rel))
1891 68 : relids_logged = lappend_oid(relids_logged, myrelid);
1892 :
1893 3158 : if (recurse)
1894 : {
1895 : ListCell *child;
1896 : List *children;
1897 :
1898 1836 : children = find_all_inheritors(myrelid, lockmode, NULL);
1899 :
1900 5476 : foreach(child, children)
1901 : {
1902 3640 : Oid childrelid = lfirst_oid(child);
1903 :
1904 3640 : if (list_member_oid(relids, childrelid))
1905 1836 : 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 1322 : 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 2880 : ExecuteTruncateGuts(rels, relids, relids_logged,
1950 2880 : stmt->behavior, stmt->restart_seqs, false);
1951 :
1952 : /* And close the rels */
1953 7586 : foreach(cell, rels)
1954 : {
1955 4788 : Relation rel = (Relation) lfirst(cell);
1956 :
1957 4788 : table_close(rel, NoLock);
1958 : }
1959 2798 : }
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 2918 : 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 2918 : List *seq_relids = NIL;
1983 2918 : 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 2918 : rels = list_copy(explicit_rels);
2002 2918 : 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 2918 : if (behavior == DROP_RESTRICT)
2043 2878 : 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 2844 : if (restart_seqs)
2053 : {
2054 52 : foreach(cell, rels)
2055 : {
2056 26 : Relation rel = (Relation) lfirst(cell);
2057 26 : List *seqlist = getOwnedSequences(RelationGetRelid(rel));
2058 : ListCell *seqcell;
2059 :
2060 62 : foreach(seqcell, seqlist)
2061 : {
2062 36 : Oid seq_relid = lfirst_oid(seqcell);
2063 : Relation seq_rel;
2064 :
2065 36 : seq_rel = relation_open(seq_relid, AccessExclusiveLock);
2066 :
2067 : /* This check must match AlterSequence! */
2068 36 : if (!object_ownercheck(RelationRelationId, seq_relid, GetUserId()))
2069 0 : aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SEQUENCE,
2070 0 : RelationGetRelationName(seq_rel));
2071 :
2072 36 : seq_relids = lappend_oid(seq_relids, seq_relid);
2073 :
2074 36 : relation_close(seq_rel, NoLock);
2075 : }
2076 : }
2077 : }
2078 :
2079 : /* Prepare to catch AFTER triggers. */
2080 2844 : 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 2844 : estate = CreateExecutorState();
2092 : resultRelInfos = (ResultRelInfo *)
2093 2844 : palloc(list_length(rels) * sizeof(ResultRelInfo));
2094 2844 : resultRelInfo = resultRelInfos;
2095 7804 : foreach(cell, rels)
2096 : {
2097 4960 : Relation rel = (Relation) lfirst(cell);
2098 :
2099 4960 : InitResultRelInfo(resultRelInfo,
2100 : rel,
2101 : 0, /* dummy rangetable index */
2102 : NULL,
2103 : 0);
2104 4960 : estate->es_opened_result_relations =
2105 4960 : lappend(estate->es_opened_result_relations, resultRelInfo);
2106 4960 : 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 2844 : resultRelInfo = resultRelInfos;
2116 7804 : foreach(cell, rels)
2117 : {
2118 : UserContext ucxt;
2119 :
2120 4960 : if (run_as_table_owner)
2121 70 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2122 : &ucxt);
2123 4960 : ExecBSTruncateTriggers(estate, resultRelInfo);
2124 4960 : if (run_as_table_owner)
2125 70 : RestoreUserContext(&ucxt);
2126 4960 : resultRelInfo++;
2127 : }
2128 :
2129 : /*
2130 : * OK, truncate each table.
2131 : */
2132 2844 : mySubid = GetCurrentSubTransactionId();
2133 :
2134 7804 : foreach(cell, rels)
2135 : {
2136 4960 : Relation rel = (Relation) lfirst(cell);
2137 :
2138 : /* Skip partitioned tables as there is nothing to do */
2139 4960 : 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 4256 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
2150 : {
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 4222 : if (rel->rd_createSubid == mySubid ||
2192 4196 : 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 4132 : 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 4132 : 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 4132 : RelationSetNewRelfilenumber(rel, rel->rd_rel->relpersistence);
2219 :
2220 4132 : heap_relid = RelationGetRelid(rel);
2221 :
2222 : /*
2223 : * The same for the toast table, if any.
2224 : */
2225 4132 : toast_relid = rel->rd_rel->reltoastrelid;
2226 4132 : if (OidIsValid(toast_relid))
2227 : {
2228 2282 : Relation toastrel = relation_open(toast_relid,
2229 : AccessExclusiveLock);
2230 :
2231 2282 : RelationSetNewRelfilenumber(toastrel,
2232 2282 : toastrel->rd_rel->relpersistence);
2233 2282 : table_close(toastrel, NoLock);
2234 : }
2235 :
2236 : /*
2237 : * Reconstruct the indexes to match, and we're done.
2238 : */
2239 4132 : reindex_relation(NULL, heap_relid, REINDEX_REL_PROCESS_TOAST,
2240 : &reindex_params);
2241 : }
2242 :
2243 4222 : pgstat_count_truncate(rel);
2244 : }
2245 :
2246 : /* Now go through the hash table, and truncate foreign tables */
2247 2844 : 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 2872 : foreach(cell, seq_relids)
2279 : {
2280 36 : Oid seq_relid = lfirst_oid(cell);
2281 :
2282 36 : 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 2836 : if (relids_logged != NIL)
2293 : {
2294 : xl_heap_truncate xlrec;
2295 54 : int i = 0;
2296 :
2297 : /* should only get here if wal_level >= logical */
2298 : Assert(XLogLogicalInfoActive());
2299 :
2300 54 : logrelids = palloc(list_length(relids_logged) * sizeof(Oid));
2301 144 : foreach(cell, relids_logged)
2302 90 : logrelids[i++] = lfirst_oid(cell);
2303 :
2304 54 : xlrec.dbId = MyDatabaseId;
2305 54 : xlrec.nrelids = list_length(relids_logged);
2306 54 : xlrec.flags = 0;
2307 54 : if (behavior == DROP_CASCADE)
2308 2 : xlrec.flags |= XLH_TRUNCATE_CASCADE;
2309 54 : if (restart_seqs)
2310 4 : xlrec.flags |= XLH_TRUNCATE_RESTART_SEQS;
2311 :
2312 54 : XLogBeginInsert();
2313 54 : XLogRegisterData(&xlrec, SizeOfHeapTruncate);
2314 54 : XLogRegisterData(logrelids, list_length(relids_logged) * sizeof(Oid));
2315 :
2316 54 : XLogSetRecordFlags(XLOG_INCLUDE_ORIGIN);
2317 :
2318 54 : (void) XLogInsert(RM_HEAP_ID, XLOG_HEAP_TRUNCATE);
2319 : }
2320 :
2321 : /*
2322 : * Process all AFTER STATEMENT TRUNCATE triggers.
2323 : */
2324 2836 : resultRelInfo = resultRelInfos;
2325 7788 : foreach(cell, rels)
2326 : {
2327 : UserContext ucxt;
2328 :
2329 4952 : if (run_as_table_owner)
2330 70 : SwitchToUntrustedUser(resultRelInfo->ri_RelationDesc->rd_rel->relowner,
2331 : &ucxt);
2332 4952 : ExecASTruncateTriggers(estate, resultRelInfo);
2333 4952 : if (run_as_table_owner)
2334 70 : RestoreUserContext(&ucxt);
2335 4952 : resultRelInfo++;
2336 : }
2337 :
2338 : /* Handle queued AFTER triggers */
2339 2836 : AfterTriggerEndQuery(estate);
2340 :
2341 : /* We can clean up the EState now */
2342 2836 : FreeExecutorState(estate);
2343 :
2344 : /*
2345 : * Close any rels opened by CASCADE (can't do this while EState still
2346 : * holds refs)
2347 : */
2348 2836 : rels = list_difference_ptr(rels, explicit_rels);
2349 2930 : foreach(cell, rels)
2350 : {
2351 94 : Relation rel = (Relation) lfirst(cell);
2352 :
2353 94 : table_close(rel, NoLock);
2354 : }
2355 2836 : }
2356 :
2357 : /*
2358 : * Check that a given relation is safe to truncate. Subroutine for
2359 : * ExecuteTruncate() and RangeVarCallbackForTruncate().
2360 : */
2361 : static void
2362 5476 : truncate_check_rel(Oid relid, Form_pg_class reltuple)
2363 : {
2364 5476 : 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 5476 : 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 5438 : else if (reltuple->relkind != RELKIND_RELATION &&
2384 716 : 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 to be truncated as part of pg_upgrade, because we need
2393 : * to change its relfilenode to match the old cluster, and allowing a
2394 : * TRUNCATE command to be executed is the easiest way of doing that.
2395 : */
2396 5472 : if (!allowSystemTableMods && IsSystemClass(relid, reltuple)
2397 50 : && (!IsBinaryUpgrade || relid != LargeObjectRelationId))
2398 2 : ereport(ERROR,
2399 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
2400 : errmsg("permission denied: \"%s\" is a system catalog",
2401 : relname)));
2402 :
2403 5470 : InvokeObjectTruncateHook(relid);
2404 5470 : }
2405 :
2406 : /*
2407 : * Check that current user has the permission to truncate given relation.
2408 : */
2409 : static void
2410 3674 : truncate_check_perms(Oid relid, Form_pg_class reltuple)
2411 : {
2412 3674 : char *relname = NameStr(reltuple->relname);
2413 : AclResult aclresult;
2414 :
2415 : /* Permissions checks */
2416 3674 : aclresult = pg_class_aclcheck(relid, GetUserId(), ACL_TRUNCATE);
2417 3674 : if (aclresult != ACLCHECK_OK)
2418 32 : aclcheck_error(aclresult, get_relkind_objtype(reltuple->relkind),
2419 : relname);
2420 3642 : }
2421 :
2422 : /*
2423 : * Set of extra sanity checks to check if a given relation is safe to
2424 : * truncate. This is split with truncate_check_rel() as
2425 : * RangeVarCallbackForTruncate() cannot open a Relation yet.
2426 : */
2427 : static void
2428 5054 : truncate_check_activity(Relation rel)
2429 : {
2430 : /*
2431 : * Don't allow truncate on temp tables of other backends ... their local
2432 : * buffer manager is not going to cope.
2433 : */
2434 5054 : if (RELATION_IS_OTHER_TEMP(rel))
2435 0 : ereport(ERROR,
2436 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2437 : errmsg("cannot truncate temporary tables of other sessions")));
2438 :
2439 : /*
2440 : * Also check for active uses of the relation in the current transaction,
2441 : * including open scans and pending AFTER trigger events.
2442 : */
2443 5054 : CheckTableNotInUse(rel, "TRUNCATE");
2444 5048 : }
2445 :
2446 : /*
2447 : * storage_name
2448 : * returns the name corresponding to a typstorage/attstorage enum value
2449 : */
2450 : static const char *
2451 24 : storage_name(char c)
2452 : {
2453 24 : switch (c)
2454 : {
2455 0 : case TYPSTORAGE_PLAIN:
2456 0 : return "PLAIN";
2457 0 : case TYPSTORAGE_EXTERNAL:
2458 0 : return "EXTERNAL";
2459 12 : case TYPSTORAGE_EXTENDED:
2460 12 : return "EXTENDED";
2461 12 : case TYPSTORAGE_MAIN:
2462 12 : return "MAIN";
2463 0 : default:
2464 0 : return "???";
2465 : }
2466 : }
2467 :
2468 : /*----------
2469 : * MergeAttributes
2470 : * Returns new schema given initial schema and superclasses.
2471 : *
2472 : * Input arguments:
2473 : * 'columns' is the column/attribute definition for the table. (It's a list
2474 : * of ColumnDef's.) It is destructively changed.
2475 : * 'supers' is a list of OIDs of parent relations, already locked by caller.
2476 : * 'relpersistence' is the persistence type of the table.
2477 : * 'is_partition' tells if the table is a partition.
2478 : *
2479 : * Output arguments:
2480 : * 'supconstr' receives a list of CookedConstraint representing
2481 : * CHECK constraints belonging to parent relations, updated as
2482 : * necessary to be valid for the child.
2483 : * 'supnotnulls' receives a list of CookedConstraint representing
2484 : * not-null constraints based on those from parent relations.
2485 : *
2486 : * Return value:
2487 : * Completed schema list.
2488 : *
2489 : * Notes:
2490 : * The order in which the attributes are inherited is very important.
2491 : * Intuitively, the inherited attributes should come first. If a table
2492 : * inherits from multiple parents, the order of those attributes are
2493 : * according to the order of the parents specified in CREATE TABLE.
2494 : *
2495 : * Here's an example:
2496 : *
2497 : * create table person (name text, age int4, location point);
2498 : * create table emp (salary int4, manager text) inherits(person);
2499 : * create table student (gpa float8) inherits (person);
2500 : * create table stud_emp (percent int4) inherits (emp, student);
2501 : *
2502 : * The order of the attributes of stud_emp is:
2503 : *
2504 : * person {1:name, 2:age, 3:location}
2505 : * / \
2506 : * {6:gpa} student emp {4:salary, 5:manager}
2507 : * \ /
2508 : * stud_emp {7:percent}
2509 : *
2510 : * If the same attribute name appears multiple times, then it appears
2511 : * in the result table in the proper location for its first appearance.
2512 : *
2513 : * Constraints (including not-null constraints) for the child table
2514 : * are the union of all relevant constraints, from both the child schema
2515 : * and parent tables. In addition, in legacy inheritance, each column that
2516 : * appears in a primary key in any of the parents also gets a NOT NULL
2517 : * constraint (partitioning doesn't need this, because the PK itself gets
2518 : * inherited.)
2519 : *
2520 : * The default value for a child column is defined as:
2521 : * (1) If the child schema specifies a default, that value is used.
2522 : * (2) If neither the child nor any parent specifies a default, then
2523 : * the column will not have a default.
2524 : * (3) If conflicting defaults are inherited from different parents
2525 : * (and not overridden by the child), an error is raised.
2526 : * (4) Otherwise the inherited default is used.
2527 : *
2528 : * Note that the default-value infrastructure is used for generated
2529 : * columns' expressions too, so most of the preceding paragraph applies
2530 : * to generation expressions too. We insist that a child column be
2531 : * generated if and only if its parent(s) are, but it need not have
2532 : * the same generation expression.
2533 : *----------
2534 : */
2535 : static List *
2536 63116 : MergeAttributes(List *columns, const List *supers, char relpersistence,
2537 : bool is_partition, List **supconstr, List **supnotnulls)
2538 : {
2539 63116 : List *inh_columns = NIL;
2540 63116 : List *constraints = NIL;
2541 63116 : List *nnconstraints = NIL;
2542 63116 : bool have_bogus_defaults = false;
2543 : int child_attno;
2544 : static Node bogus_marker = {0}; /* marks conflicting defaults */
2545 63116 : List *saved_columns = NIL;
2546 : ListCell *lc;
2547 :
2548 : /*
2549 : * Check for and reject tables with too many columns. We perform this
2550 : * check relatively early for two reasons: (a) we don't run the risk of
2551 : * overflowing an AttrNumber in subsequent code (b) an O(n^2) algorithm is
2552 : * okay if we're processing <= 1600 columns, but could take minutes to
2553 : * execute if the user attempts to create a table with hundreds of
2554 : * thousands of columns.
2555 : *
2556 : * Note that we also need to check that we do not exceed this figure after
2557 : * including columns from inherited relations.
2558 : */
2559 63116 : if (list_length(columns) > MaxHeapAttributeNumber)
2560 0 : ereport(ERROR,
2561 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
2562 : errmsg("tables can have at most %d columns",
2563 : MaxHeapAttributeNumber)));
2564 :
2565 : /*
2566 : * Check for duplicate names in the explicit list of attributes.
2567 : *
2568 : * Although we might consider merging such entries in the same way that we
2569 : * handle name conflicts for inherited attributes, it seems to make more
2570 : * sense to assume such conflicts are errors.
2571 : *
2572 : * We don't use foreach() here because we have two nested loops over the
2573 : * columns list, with possible element deletions in the inner one. If we
2574 : * used foreach_delete_current() it could only fix up the state of one of
2575 : * the loops, so it seems cleaner to use looping over list indexes for
2576 : * both loops. Note that any deletion will happen beyond where the outer
2577 : * loop is, so its index never needs adjustment.
2578 : */
2579 298252 : for (int coldefpos = 0; coldefpos < list_length(columns); coldefpos++)
2580 : {
2581 235160 : ColumnDef *coldef = list_nth_node(ColumnDef, columns, coldefpos);
2582 :
2583 235160 : if (!is_partition && coldef->typeName == NULL)
2584 : {
2585 : /*
2586 : * Typed table column option that does not belong to a column from
2587 : * the type. This works because the columns from the type come
2588 : * first in the list. (We omit this check for partition column
2589 : * lists; those are processed separately below.)
2590 : */
2591 6 : ereport(ERROR,
2592 : (errcode(ERRCODE_UNDEFINED_COLUMN),
2593 : errmsg("column \"%s\" does not exist",
2594 : coldef->colname)));
2595 : }
2596 :
2597 : /* restpos scans all entries beyond coldef; incr is in loop body */
2598 7743952 : for (int restpos = coldefpos + 1; restpos < list_length(columns);)
2599 : {
2600 7508816 : ColumnDef *restdef = list_nth_node(ColumnDef, columns, restpos);
2601 :
2602 7508816 : if (strcmp(coldef->colname, restdef->colname) == 0)
2603 : {
2604 58 : if (coldef->is_from_type)
2605 : {
2606 : /*
2607 : * merge the column options into the column from the type
2608 : */
2609 40 : coldef->is_not_null = restdef->is_not_null;
2610 40 : coldef->raw_default = restdef->raw_default;
2611 40 : coldef->cooked_default = restdef->cooked_default;
2612 40 : coldef->constraints = restdef->constraints;
2613 40 : coldef->is_from_type = false;
2614 40 : columns = list_delete_nth_cell(columns, restpos);
2615 : }
2616 : else
2617 18 : ereport(ERROR,
2618 : (errcode(ERRCODE_DUPLICATE_COLUMN),
2619 : errmsg("column \"%s\" specified more than once",
2620 : coldef->colname)));
2621 : }
2622 : else
2623 7508758 : restpos++;
2624 : }
2625 : }
2626 :
2627 : /*
2628 : * In case of a partition, there are no new column definitions, only dummy
2629 : * ColumnDefs created for column constraints. Set them aside for now and
2630 : * process them at the end.
2631 : */
2632 63092 : if (is_partition)
2633 : {
2634 7910 : saved_columns = columns;
2635 7910 : columns = NIL;
2636 : }
2637 :
2638 : /*
2639 : * Scan the parents left-to-right, and merge their attributes to form a
2640 : * list of inherited columns (inh_columns).
2641 : */
2642 63092 : child_attno = 0;
2643 73502 : foreach(lc, supers)
2644 : {
2645 10494 : Oid parent = lfirst_oid(lc);
2646 : Relation relation;
2647 : TupleDesc tupleDesc;
2648 : TupleConstr *constr;
2649 : AttrMap *newattmap;
2650 : List *inherited_defaults;
2651 : List *cols_with_defaults;
2652 : List *nnconstrs;
2653 : ListCell *lc1;
2654 : ListCell *lc2;
2655 10494 : Bitmapset *nncols = NULL;
2656 :
2657 : /* caller already got lock */
2658 10494 : relation = table_open(parent, NoLock);
2659 :
2660 : /*
2661 : * Check for active uses of the parent partitioned table in the
2662 : * current transaction, such as being used in some manner by an
2663 : * enclosing command.
2664 : */
2665 10494 : if (is_partition)
2666 7910 : CheckTableNotInUse(relation, "CREATE TABLE .. PARTITION OF");
2667 :
2668 : /*
2669 : * We do not allow partitioned tables and partitions to participate in
2670 : * regular inheritance.
2671 : */
2672 10488 : if (relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !is_partition)
2673 6 : ereport(ERROR,
2674 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2675 : errmsg("cannot inherit from partitioned table \"%s\"",
2676 : RelationGetRelationName(relation))));
2677 10482 : if (relation->rd_rel->relispartition && !is_partition)
2678 6 : ereport(ERROR,
2679 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2680 : errmsg("cannot inherit from partition \"%s\"",
2681 : RelationGetRelationName(relation))));
2682 :
2683 10476 : if (relation->rd_rel->relkind != RELKIND_RELATION &&
2684 7906 : relation->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
2685 7886 : relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
2686 0 : ereport(ERROR,
2687 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2688 : errmsg("inherited relation \"%s\" is not a table or foreign table",
2689 : RelationGetRelationName(relation))));
2690 :
2691 : /*
2692 : * If the parent is permanent, so must be all of its partitions. Note
2693 : * that inheritance allows that case.
2694 : */
2695 10476 : if (is_partition &&
2696 7904 : relation->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
2697 : relpersistence == RELPERSISTENCE_TEMP)
2698 6 : ereport(ERROR,
2699 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2700 : errmsg("cannot create a temporary relation as partition of permanent relation \"%s\"",
2701 : RelationGetRelationName(relation))));
2702 :
2703 : /* Permanent rels cannot inherit from temporary ones */
2704 10470 : if (relpersistence != RELPERSISTENCE_TEMP &&
2705 10116 : relation->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
2706 24 : ereport(ERROR,
2707 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2708 : errmsg(!is_partition
2709 : ? "cannot inherit from temporary relation \"%s\""
2710 : : "cannot create a permanent relation as partition of temporary relation \"%s\"",
2711 : RelationGetRelationName(relation))));
2712 :
2713 : /* If existing rel is temp, it must belong to this session */
2714 10446 : if (relation->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
2715 300 : !relation->rd_islocaltemp)
2716 0 : ereport(ERROR,
2717 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2718 : errmsg(!is_partition
2719 : ? "cannot inherit from temporary relation of another session"
2720 : : "cannot create as partition of temporary relation of another session")));
2721 :
2722 : /*
2723 : * We should have an UNDER permission flag for this, but for now,
2724 : * demand that creator of a child table own the parent.
2725 : */
2726 10446 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(relation), GetUserId()))
2727 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(relation->rd_rel->relkind),
2728 0 : RelationGetRelationName(relation));
2729 :
2730 10446 : tupleDesc = RelationGetDescr(relation);
2731 10446 : constr = tupleDesc->constr;
2732 :
2733 : /*
2734 : * newattmap->attnums[] will contain the child-table attribute numbers
2735 : * for the attributes of this parent table. (They are not the same
2736 : * for parents after the first one, nor if we have dropped columns.)
2737 : */
2738 10446 : newattmap = make_attrmap(tupleDesc->natts);
2739 :
2740 : /* We can't process inherited defaults until newattmap is complete. */
2741 10446 : inherited_defaults = cols_with_defaults = NIL;
2742 :
2743 : /*
2744 : * Request attnotnull on columns that have a not-null constraint
2745 : * that's not marked NO INHERIT (even if not valid).
2746 : */
2747 10446 : nnconstrs = RelationGetNotNullConstraints(RelationGetRelid(relation),
2748 : true, false);
2749 23280 : foreach_ptr(CookedConstraint, cc, nnconstrs)
2750 2388 : nncols = bms_add_member(nncols, cc->attnum);
2751 :
2752 31376 : for (AttrNumber parent_attno = 1; parent_attno <= tupleDesc->natts;
2753 20930 : parent_attno++)
2754 : {
2755 20966 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc,
2756 : parent_attno - 1);
2757 20966 : char *attributeName = NameStr(attribute->attname);
2758 : int exist_attno;
2759 : ColumnDef *newdef;
2760 : ColumnDef *mergeddef;
2761 :
2762 : /*
2763 : * Ignore dropped columns in the parent.
2764 : */
2765 20966 : if (attribute->attisdropped)
2766 192 : continue; /* leave newattmap->attnums entry as zero */
2767 :
2768 : /*
2769 : * Create new column definition
2770 : */
2771 20774 : newdef = makeColumnDef(attributeName, attribute->atttypid,
2772 : attribute->atttypmod, attribute->attcollation);
2773 20774 : newdef->storage = attribute->attstorage;
2774 20774 : newdef->generated = attribute->attgenerated;
2775 20774 : if (CompressionMethodIsValid(attribute->attcompression))
2776 32 : newdef->compression =
2777 32 : pstrdup(GetCompressionMethodName(attribute->attcompression));
2778 :
2779 : /*
2780 : * Regular inheritance children are independent enough not to
2781 : * inherit identity columns. But partitions are integral part of
2782 : * a partitioned table and inherit identity column.
2783 : */
2784 20774 : if (is_partition)
2785 16030 : newdef->identity = attribute->attidentity;
2786 :
2787 : /*
2788 : * Does it match some previously considered column from another
2789 : * parent?
2790 : */
2791 20774 : exist_attno = findAttrByName(attributeName, inh_columns);
2792 20774 : if (exist_attno > 0)
2793 : {
2794 : /*
2795 : * Yes, try to merge the two column definitions.
2796 : */
2797 390 : mergeddef = MergeInheritedAttribute(inh_columns, exist_attno, newdef);
2798 :
2799 354 : newattmap->attnums[parent_attno - 1] = exist_attno;
2800 :
2801 : /*
2802 : * Partitions have only one parent, so conflict should never
2803 : * occur.
2804 : */
2805 : Assert(!is_partition);
2806 : }
2807 : else
2808 : {
2809 : /*
2810 : * No, create a new inherited column
2811 : */
2812 20384 : newdef->inhcount = 1;
2813 20384 : newdef->is_local = false;
2814 20384 : inh_columns = lappend(inh_columns, newdef);
2815 :
2816 20384 : newattmap->attnums[parent_attno - 1] = ++child_attno;
2817 20384 : mergeddef = newdef;
2818 : }
2819 :
2820 : /*
2821 : * mark attnotnull if parent has it
2822 : */
2823 20738 : if (bms_is_member(parent_attno, nncols))
2824 2388 : mergeddef->is_not_null = true;
2825 :
2826 : /*
2827 : * Locate default/generation expression if any
2828 : */
2829 20738 : if (attribute->atthasdef)
2830 : {
2831 : Node *this_default;
2832 :
2833 718 : this_default = TupleDescGetDefault(tupleDesc, parent_attno);
2834 718 : if (this_default == NULL)
2835 0 : elog(ERROR, "default expression not found for attribute %d of relation \"%s\"",
2836 : parent_attno, RelationGetRelationName(relation));
2837 :
2838 : /*
2839 : * If it's a GENERATED default, it might contain Vars that
2840 : * need to be mapped to the inherited column(s)' new numbers.
2841 : * We can't do that till newattmap is ready, so just remember
2842 : * all the inherited default expressions for the moment.
2843 : */
2844 718 : inherited_defaults = lappend(inherited_defaults, this_default);
2845 718 : cols_with_defaults = lappend(cols_with_defaults, mergeddef);
2846 : }
2847 : }
2848 :
2849 : /*
2850 : * Now process any inherited default expressions, adjusting attnos
2851 : * using the completed newattmap map.
2852 : */
2853 11128 : forboth(lc1, inherited_defaults, lc2, cols_with_defaults)
2854 : {
2855 718 : Node *this_default = (Node *) lfirst(lc1);
2856 718 : ColumnDef *def = (ColumnDef *) lfirst(lc2);
2857 : bool found_whole_row;
2858 :
2859 : /* Adjust Vars to match new table's column numbering */
2860 718 : this_default = map_variable_attnos(this_default,
2861 : 1, 0,
2862 : newattmap,
2863 : InvalidOid, &found_whole_row);
2864 :
2865 : /*
2866 : * For the moment we have to reject whole-row variables. We could
2867 : * convert them, if we knew the new table's rowtype OID, but that
2868 : * hasn't been assigned yet. (A variable could only appear in a
2869 : * generation expression, so the error message is correct.)
2870 : */
2871 718 : if (found_whole_row)
2872 0 : ereport(ERROR,
2873 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2874 : errmsg("cannot convert whole-row table reference"),
2875 : errdetail("Generation expression for column \"%s\" contains a whole-row reference to table \"%s\".",
2876 : def->colname,
2877 : RelationGetRelationName(relation))));
2878 :
2879 : /*
2880 : * If we already had a default from some prior parent, check to
2881 : * see if they are the same. If so, no problem; if not, mark the
2882 : * column as having a bogus default. Below, we will complain if
2883 : * the bogus default isn't overridden by the child columns.
2884 : */
2885 : Assert(def->raw_default == NULL);
2886 718 : if (def->cooked_default == NULL)
2887 672 : def->cooked_default = this_default;
2888 46 : else if (!equal(def->cooked_default, this_default))
2889 : {
2890 40 : def->cooked_default = &bogus_marker;
2891 40 : have_bogus_defaults = true;
2892 : }
2893 : }
2894 :
2895 : /*
2896 : * Now copy the CHECK constraints of this parent, adjusting attnos
2897 : * using the completed newattmap map. Identically named constraints
2898 : * are merged if possible, else we throw error.
2899 : */
2900 10410 : if (constr && constr->num_check > 0)
2901 : {
2902 342 : ConstrCheck *check = constr->check;
2903 :
2904 1060 : for (int i = 0; i < constr->num_check; i++)
2905 : {
2906 718 : char *name = check[i].ccname;
2907 : Node *expr;
2908 : bool found_whole_row;
2909 :
2910 : /* ignore if the constraint is non-inheritable */
2911 718 : if (check[i].ccnoinherit)
2912 56 : continue;
2913 :
2914 : /* Adjust Vars to match new table's column numbering */
2915 662 : expr = map_variable_attnos(stringToNode(check[i].ccbin),
2916 : 1, 0,
2917 : newattmap,
2918 : InvalidOid, &found_whole_row);
2919 :
2920 : /*
2921 : * For the moment we have to reject whole-row variables. We
2922 : * could convert them, if we knew the new table's rowtype OID,
2923 : * but that hasn't been assigned yet.
2924 : */
2925 662 : if (found_whole_row)
2926 0 : ereport(ERROR,
2927 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2928 : errmsg("cannot convert whole-row table reference"),
2929 : errdetail("Constraint \"%s\" contains a whole-row reference to table \"%s\".",
2930 : name,
2931 : RelationGetRelationName(relation))));
2932 :
2933 662 : constraints = MergeCheckConstraint(constraints, name, expr,
2934 662 : check[i].ccenforced);
2935 : }
2936 : }
2937 :
2938 : /*
2939 : * Also copy the not-null constraints from this parent. The
2940 : * attnotnull markings were already installed above.
2941 : */
2942 23208 : foreach_ptr(CookedConstraint, nn, nnconstrs)
2943 : {
2944 : Assert(nn->contype == CONSTR_NOTNULL);
2945 :
2946 2388 : nn->attnum = newattmap->attnums[nn->attnum - 1];
2947 :
2948 2388 : nnconstraints = lappend(nnconstraints, nn);
2949 : }
2950 :
2951 10410 : free_attrmap(newattmap);
2952 :
2953 : /*
2954 : * Close the parent rel, but keep our lock on it until xact commit.
2955 : * That will prevent someone else from deleting or ALTERing the parent
2956 : * before the child is committed.
2957 : */
2958 10410 : table_close(relation, NoLock);
2959 : }
2960 :
2961 : /*
2962 : * If we had no inherited attributes, the result columns are just the
2963 : * explicitly declared columns. Otherwise, we need to merge the declared
2964 : * columns into the inherited column list. Although, we never have any
2965 : * explicitly declared columns if the table is a partition.
2966 : */
2967 63008 : if (inh_columns != NIL)
2968 : {
2969 9962 : int newcol_attno = 0;
2970 :
2971 11038 : foreach(lc, columns)
2972 : {
2973 1154 : ColumnDef *newdef = lfirst_node(ColumnDef, lc);
2974 1154 : char *attributeName = newdef->colname;
2975 : int exist_attno;
2976 :
2977 : /*
2978 : * Partitions have only one parent and have no column definitions
2979 : * of their own, so conflict should never occur.
2980 : */
2981 : Assert(!is_partition);
2982 :
2983 1154 : newcol_attno++;
2984 :
2985 : /*
2986 : * Does it match some inherited column?
2987 : */
2988 1154 : exist_attno = findAttrByName(attributeName, inh_columns);
2989 1154 : if (exist_attno > 0)
2990 : {
2991 : /*
2992 : * Yes, try to merge the two column definitions.
2993 : */
2994 428 : MergeChildAttribute(inh_columns, exist_attno, newcol_attno, newdef);
2995 : }
2996 : else
2997 : {
2998 : /*
2999 : * No, attach new column unchanged to result columns.
3000 : */
3001 726 : inh_columns = lappend(inh_columns, newdef);
3002 : }
3003 : }
3004 :
3005 9884 : columns = inh_columns;
3006 :
3007 : /*
3008 : * Check that we haven't exceeded the legal # of columns after merging
3009 : * in inherited columns.
3010 : */
3011 9884 : if (list_length(columns) > MaxHeapAttributeNumber)
3012 0 : ereport(ERROR,
3013 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
3014 : errmsg("tables can have at most %d columns",
3015 : MaxHeapAttributeNumber)));
3016 : }
3017 :
3018 : /*
3019 : * Now that we have the column definition list for a partition, we can
3020 : * check whether the columns referenced in the column constraint specs
3021 : * actually exist. Also, merge column defaults.
3022 : */
3023 62930 : if (is_partition)
3024 : {
3025 8086 : foreach(lc, saved_columns)
3026 : {
3027 242 : ColumnDef *restdef = lfirst(lc);
3028 242 : bool found = false;
3029 : ListCell *l;
3030 :
3031 900 : foreach(l, columns)
3032 : {
3033 694 : ColumnDef *coldef = lfirst(l);
3034 :
3035 694 : if (strcmp(coldef->colname, restdef->colname) == 0)
3036 : {
3037 242 : found = true;
3038 :
3039 : /*
3040 : * Check for conflicts related to generated columns.
3041 : *
3042 : * Same rules as above: generated-ness has to match the
3043 : * parent, but the contents of the generation expression
3044 : * can be different.
3045 : */
3046 242 : if (coldef->generated)
3047 : {
3048 134 : if (restdef->raw_default && !restdef->generated)
3049 12 : ereport(ERROR,
3050 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3051 : errmsg("column \"%s\" inherits from generated column but specifies default",
3052 : restdef->colname)));
3053 122 : if (restdef->identity)
3054 0 : ereport(ERROR,
3055 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3056 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3057 : restdef->colname)));
3058 : }
3059 : else
3060 : {
3061 108 : if (restdef->generated)
3062 12 : ereport(ERROR,
3063 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3064 : errmsg("child column \"%s\" specifies generation expression",
3065 : restdef->colname),
3066 : errhint("A child table column cannot be generated unless its parent column is.")));
3067 : }
3068 :
3069 218 : if (coldef->generated && restdef->generated && coldef->generated != restdef->generated)
3070 12 : ereport(ERROR,
3071 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3072 : errmsg("column \"%s\" inherits from generated column of different kind",
3073 : restdef->colname),
3074 : errdetail("Parent column is %s, child column is %s.",
3075 : coldef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3076 : restdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3077 :
3078 : /*
3079 : * Override the parent's default value for this column
3080 : * (coldef->cooked_default) with the partition's local
3081 : * definition (restdef->raw_default), if there's one. It
3082 : * should be physically impossible to get a cooked default
3083 : * in the local definition or a raw default in the
3084 : * inherited definition, but make sure they're nulls, for
3085 : * future-proofing.
3086 : */
3087 : Assert(restdef->cooked_default == NULL);
3088 : Assert(coldef->raw_default == NULL);
3089 206 : if (restdef->raw_default)
3090 : {
3091 134 : coldef->raw_default = restdef->raw_default;
3092 134 : coldef->cooked_default = NULL;
3093 : }
3094 : }
3095 : }
3096 :
3097 : /* complain for constraints on columns not in parent */
3098 206 : if (!found)
3099 0 : ereport(ERROR,
3100 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3101 : errmsg("column \"%s\" does not exist",
3102 : restdef->colname)));
3103 : }
3104 : }
3105 :
3106 : /*
3107 : * If we found any conflicting parent default values, check to make sure
3108 : * they were overridden by the child.
3109 : */
3110 62894 : if (have_bogus_defaults)
3111 : {
3112 106 : foreach(lc, columns)
3113 : {
3114 84 : ColumnDef *def = lfirst(lc);
3115 :
3116 84 : if (def->cooked_default == &bogus_marker)
3117 : {
3118 18 : if (def->generated)
3119 12 : ereport(ERROR,
3120 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3121 : errmsg("column \"%s\" inherits conflicting generation expressions",
3122 : def->colname),
3123 : errhint("To resolve the conflict, specify a generation expression explicitly.")));
3124 : else
3125 6 : ereport(ERROR,
3126 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3127 : errmsg("column \"%s\" inherits conflicting default values",
3128 : def->colname),
3129 : errhint("To resolve the conflict, specify a default explicitly.")));
3130 : }
3131 : }
3132 : }
3133 :
3134 62876 : *supconstr = constraints;
3135 62876 : *supnotnulls = nnconstraints;
3136 :
3137 62876 : return columns;
3138 : }
3139 :
3140 :
3141 : /*
3142 : * MergeCheckConstraint
3143 : * Try to merge an inherited CHECK constraint with previous ones
3144 : *
3145 : * If we inherit identically-named constraints from multiple parents, we must
3146 : * merge them, or throw an error if they don't have identical definitions.
3147 : *
3148 : * constraints is a list of CookedConstraint structs for previous constraints.
3149 : *
3150 : * If the new constraint matches an existing one, then the existing
3151 : * constraint's inheritance count is updated. If there is a conflict (same
3152 : * name but different expression), throw an error. If the constraint neither
3153 : * matches nor conflicts with an existing one, a new constraint is appended to
3154 : * the list.
3155 : */
3156 : static List *
3157 662 : MergeCheckConstraint(List *constraints, const char *name, Node *expr, bool is_enforced)
3158 : {
3159 : ListCell *lc;
3160 : CookedConstraint *newcon;
3161 :
3162 2116 : foreach(lc, constraints)
3163 : {
3164 1604 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lc);
3165 :
3166 : Assert(ccon->contype == CONSTR_CHECK);
3167 :
3168 : /* Non-matching names never conflict */
3169 1604 : if (strcmp(ccon->name, name) != 0)
3170 1454 : continue;
3171 :
3172 150 : if (equal(expr, ccon->expr))
3173 : {
3174 : /* OK to merge constraint with existing */
3175 150 : if (pg_add_s16_overflow(ccon->inhcount, 1,
3176 : &ccon->inhcount))
3177 0 : ereport(ERROR,
3178 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3179 : errmsg("too many inheritance parents"));
3180 :
3181 : /*
3182 : * When enforceability differs, the merged constraint should be
3183 : * marked as ENFORCED because one of the parents is ENFORCED.
3184 : */
3185 150 : if (!ccon->is_enforced && is_enforced)
3186 : {
3187 48 : ccon->is_enforced = true;
3188 48 : ccon->skip_validation = false;
3189 : }
3190 :
3191 150 : return constraints;
3192 : }
3193 :
3194 0 : ereport(ERROR,
3195 : (errcode(ERRCODE_DUPLICATE_OBJECT),
3196 : errmsg("check constraint name \"%s\" appears multiple times but with different expressions",
3197 : name)));
3198 : }
3199 :
3200 : /*
3201 : * Constraint couldn't be merged with an existing one and also didn't
3202 : * conflict with an existing one, so add it as a new one to the list.
3203 : */
3204 512 : newcon = palloc0_object(CookedConstraint);
3205 512 : newcon->contype = CONSTR_CHECK;
3206 512 : newcon->name = pstrdup(name);
3207 512 : newcon->expr = expr;
3208 512 : newcon->inhcount = 1;
3209 512 : newcon->is_enforced = is_enforced;
3210 512 : newcon->skip_validation = !is_enforced;
3211 512 : return lappend(constraints, newcon);
3212 : }
3213 :
3214 : /*
3215 : * MergeChildAttribute
3216 : * Merge given child attribute definition into given inherited attribute.
3217 : *
3218 : * Input arguments:
3219 : * 'inh_columns' is the list of inherited ColumnDefs.
3220 : * 'exist_attno' is the number of the inherited attribute in inh_columns
3221 : * 'newcol_attno' is the attribute number in child table's schema definition
3222 : * 'newdef' is the column/attribute definition from the child table.
3223 : *
3224 : * The ColumnDef in 'inh_columns' list is modified. The child attribute's
3225 : * ColumnDef remains unchanged.
3226 : *
3227 : * Notes:
3228 : * - The attribute is merged according to the rules laid out in the prologue
3229 : * of MergeAttributes().
3230 : * - If matching inherited attribute exists but the child attribute can not be
3231 : * merged into it, the function throws respective errors.
3232 : * - A partition can not have its own column definitions. Hence this function
3233 : * is applicable only to a regular inheritance child.
3234 : */
3235 : static void
3236 428 : MergeChildAttribute(List *inh_columns, int exist_attno, int newcol_attno, const ColumnDef *newdef)
3237 : {
3238 428 : char *attributeName = newdef->colname;
3239 : ColumnDef *inhdef;
3240 : Oid inhtypeid,
3241 : newtypeid;
3242 : int32 inhtypmod,
3243 : newtypmod;
3244 : Oid inhcollid,
3245 : newcollid;
3246 :
3247 428 : if (exist_attno == newcol_attno)
3248 366 : ereport(NOTICE,
3249 : (errmsg("merging column \"%s\" with inherited definition",
3250 : attributeName)));
3251 : else
3252 62 : ereport(NOTICE,
3253 : (errmsg("moving and merging column \"%s\" with inherited definition", attributeName),
3254 : errdetail("User-specified column moved to the position of the inherited column.")));
3255 :
3256 428 : inhdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3257 :
3258 : /*
3259 : * Must have the same type and typmod
3260 : */
3261 428 : typenameTypeIdAndMod(NULL, inhdef->typeName, &inhtypeid, &inhtypmod);
3262 428 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3263 428 : if (inhtypeid != newtypeid || inhtypmod != newtypmod)
3264 12 : ereport(ERROR,
3265 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3266 : errmsg("column \"%s\" has a type conflict",
3267 : attributeName),
3268 : errdetail("%s versus %s",
3269 : format_type_with_typemod(inhtypeid, inhtypmod),
3270 : format_type_with_typemod(newtypeid, newtypmod))));
3271 :
3272 : /*
3273 : * Must have the same collation
3274 : */
3275 416 : inhcollid = GetColumnDefCollation(NULL, inhdef, inhtypeid);
3276 416 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3277 416 : if (inhcollid != newcollid)
3278 6 : ereport(ERROR,
3279 : (errcode(ERRCODE_COLLATION_MISMATCH),
3280 : errmsg("column \"%s\" has a collation conflict",
3281 : attributeName),
3282 : errdetail("\"%s\" versus \"%s\"",
3283 : get_collation_name(inhcollid),
3284 : get_collation_name(newcollid))));
3285 :
3286 : /*
3287 : * Identity is never inherited by a regular inheritance child. Pick
3288 : * child's identity definition if there's one.
3289 : */
3290 410 : inhdef->identity = newdef->identity;
3291 :
3292 : /*
3293 : * Copy storage parameter
3294 : */
3295 410 : if (inhdef->storage == 0)
3296 0 : inhdef->storage = newdef->storage;
3297 410 : else if (newdef->storage != 0 && inhdef->storage != newdef->storage)
3298 6 : ereport(ERROR,
3299 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3300 : errmsg("column \"%s\" has a storage parameter conflict",
3301 : attributeName),
3302 : errdetail("%s versus %s",
3303 : storage_name(inhdef->storage),
3304 : storage_name(newdef->storage))));
3305 :
3306 : /*
3307 : * Copy compression parameter
3308 : */
3309 404 : if (inhdef->compression == NULL)
3310 398 : inhdef->compression = newdef->compression;
3311 6 : else if (newdef->compression != NULL)
3312 : {
3313 6 : if (strcmp(inhdef->compression, newdef->compression) != 0)
3314 6 : ereport(ERROR,
3315 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3316 : errmsg("column \"%s\" has a compression method conflict",
3317 : attributeName),
3318 : errdetail("%s versus %s", inhdef->compression, newdef->compression)));
3319 : }
3320 :
3321 : /*
3322 : * Merge of not-null constraints = OR 'em together
3323 : */
3324 398 : inhdef->is_not_null |= newdef->is_not_null;
3325 :
3326 : /*
3327 : * Check for conflicts related to generated columns.
3328 : *
3329 : * If the parent column is generated, the child column will be made a
3330 : * generated column if it isn't already. If it is a generated column,
3331 : * we'll take its generation expression in preference to the parent's. We
3332 : * must check that the child column doesn't specify a default value or
3333 : * identity, which matches the rules for a single column in
3334 : * parse_utilcmd.c.
3335 : *
3336 : * Conversely, if the parent column is not generated, the child column
3337 : * can't be either. (We used to allow that, but it results in being able
3338 : * to override the generation expression via UPDATEs through the parent.)
3339 : */
3340 398 : if (inhdef->generated)
3341 : {
3342 78 : if (newdef->raw_default && !newdef->generated)
3343 12 : ereport(ERROR,
3344 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3345 : errmsg("column \"%s\" inherits from generated column but specifies default",
3346 : inhdef->colname)));
3347 66 : if (newdef->identity)
3348 12 : ereport(ERROR,
3349 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3350 : errmsg("column \"%s\" inherits from generated column but specifies identity",
3351 : inhdef->colname)));
3352 : }
3353 : else
3354 : {
3355 320 : if (newdef->generated)
3356 12 : ereport(ERROR,
3357 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3358 : errmsg("child column \"%s\" specifies generation expression",
3359 : inhdef->colname),
3360 : errhint("A child table column cannot be generated unless its parent column is.")));
3361 : }
3362 :
3363 362 : if (inhdef->generated && newdef->generated && newdef->generated != inhdef->generated)
3364 12 : ereport(ERROR,
3365 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
3366 : errmsg("column \"%s\" inherits from generated column of different kind",
3367 : inhdef->colname),
3368 : errdetail("Parent column is %s, child column is %s.",
3369 : inhdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
3370 : newdef->generated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
3371 :
3372 : /*
3373 : * If new def has a default, override previous default
3374 : */
3375 350 : if (newdef->raw_default != NULL)
3376 : {
3377 38 : inhdef->raw_default = newdef->raw_default;
3378 38 : inhdef->cooked_default = newdef->cooked_default;
3379 : }
3380 :
3381 : /* Mark the column as locally defined */
3382 350 : inhdef->is_local = true;
3383 350 : }
3384 :
3385 : /*
3386 : * MergeInheritedAttribute
3387 : * Merge given parent attribute definition into specified attribute
3388 : * inherited from the previous parents.
3389 : *
3390 : * Input arguments:
3391 : * 'inh_columns' is the list of previously inherited ColumnDefs.
3392 : * 'exist_attno' is the number the existing matching attribute in inh_columns.
3393 : * 'newdef' is the new parent column/attribute definition to be merged.
3394 : *
3395 : * The matching ColumnDef in 'inh_columns' list is modified and returned.
3396 : *
3397 : * Notes:
3398 : * - The attribute is merged according to the rules laid out in the prologue
3399 : * of MergeAttributes().
3400 : * - If matching inherited attribute exists but the new attribute can not be
3401 : * merged into it, the function throws respective errors.
3402 : * - A partition inherits from only a single parent. Hence this function is
3403 : * applicable only to a regular inheritance.
3404 : */
3405 : static ColumnDef *
3406 390 : MergeInheritedAttribute(List *inh_columns,
3407 : int exist_attno,
3408 : const ColumnDef *newdef)
3409 : {
3410 390 : char *attributeName = newdef->colname;
3411 : ColumnDef *prevdef;
3412 : Oid prevtypeid,
3413 : newtypeid;
3414 : int32 prevtypmod,
3415 : newtypmod;
3416 : Oid prevcollid,
3417 : newcollid;
3418 :
3419 390 : ereport(NOTICE,
3420 : (errmsg("merging multiple inherited definitions of column \"%s\"",
3421 : attributeName)));
3422 390 : prevdef = list_nth_node(ColumnDef, inh_columns, exist_attno - 1);
3423 :
3424 : /*
3425 : * Must have the same type and typmod
3426 : */
3427 390 : typenameTypeIdAndMod(NULL, prevdef->typeName, &prevtypeid, &prevtypmod);
3428 390 : typenameTypeIdAndMod(NULL, newdef->typeName, &newtypeid, &newtypmod);
3429 390 : if (prevtypeid != newtypeid || prevtypmod != newtypmod)
3430 0 : ereport(ERROR,
3431 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3432 : errmsg("inherited column \"%s\" has a type conflict",
3433 : attributeName),
3434 : errdetail("%s versus %s",
3435 : format_type_with_typemod(prevtypeid, prevtypmod),
3436 : format_type_with_typemod(newtypeid, newtypmod))));
3437 :
3438 : /*
3439 : * Must have the same collation
3440 : */
3441 390 : prevcollid = GetColumnDefCollation(NULL, prevdef, prevtypeid);
3442 390 : newcollid = GetColumnDefCollation(NULL, newdef, newtypeid);
3443 390 : if (prevcollid != newcollid)
3444 0 : ereport(ERROR,
3445 : (errcode(ERRCODE_COLLATION_MISMATCH),
3446 : errmsg("inherited column \"%s\" has a collation conflict",
3447 : attributeName),
3448 : errdetail("\"%s\" versus \"%s\"",
3449 : get_collation_name(prevcollid),
3450 : get_collation_name(newcollid))));
3451 :
3452 : /*
3453 : * Copy/check storage parameter
3454 : */
3455 390 : if (prevdef->storage == 0)
3456 0 : prevdef->storage = newdef->storage;
3457 390 : else if (prevdef->storage != newdef->storage)
3458 6 : ereport(ERROR,
3459 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3460 : errmsg("inherited column \"%s\" has a storage parameter conflict",
3461 : attributeName),
3462 : errdetail("%s versus %s",
3463 : storage_name(prevdef->storage),
3464 : storage_name(newdef->storage))));
3465 :
3466 : /*
3467 : * Copy/check compression parameter
3468 : */
3469 384 : if (prevdef->compression == NULL)
3470 370 : prevdef->compression = newdef->compression;
3471 14 : else if (newdef->compression != NULL)
3472 : {
3473 6 : if (strcmp(prevdef->compression, newdef->compression) != 0)
3474 6 : ereport(ERROR,
3475 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3476 : errmsg("column \"%s\" has a compression method conflict",
3477 : attributeName),
3478 : errdetail("%s versus %s",
3479 : prevdef->compression, newdef->compression)));
3480 : }
3481 :
3482 : /*
3483 : * Check for GENERATED conflicts
3484 : */
3485 378 : if (prevdef->generated != newdef->generated)
3486 24 : ereport(ERROR,
3487 : (errcode(ERRCODE_DATATYPE_MISMATCH),
3488 : errmsg("inherited column \"%s\" has a generation conflict",
3489 : attributeName)));
3490 :
3491 : /*
3492 : * Default and other constraints are handled by the caller.
3493 : */
3494 :
3495 354 : if (pg_add_s16_overflow(prevdef->inhcount, 1,
3496 : &prevdef->inhcount))
3497 0 : ereport(ERROR,
3498 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
3499 : errmsg("too many inheritance parents"));
3500 :
3501 354 : return prevdef;
3502 : }
3503 :
3504 : /*
3505 : * StoreCatalogInheritance
3506 : * Updates the system catalogs with proper inheritance information.
3507 : *
3508 : * supers is a list of the OIDs of the new relation's direct ancestors.
3509 : */
3510 : static void
3511 62252 : StoreCatalogInheritance(Oid relationId, List *supers,
3512 : bool child_is_partition)
3513 : {
3514 : Relation relation;
3515 : int32 seqNumber;
3516 : ListCell *entry;
3517 :
3518 : /*
3519 : * sanity checks
3520 : */
3521 : Assert(OidIsValid(relationId));
3522 :
3523 62252 : if (supers == NIL)
3524 52728 : return;
3525 :
3526 : /*
3527 : * Store INHERITS information in pg_inherits using direct ancestors only.
3528 : * Also enter dependencies on the direct ancestors, and make sure they are
3529 : * marked with relhassubclass = true.
3530 : *
3531 : * (Once upon a time, both direct and indirect ancestors were found here
3532 : * and then entered into pg_ipl. Since that catalog doesn't exist
3533 : * anymore, there's no need to look for indirect ancestors.)
3534 : */
3535 9524 : relation = table_open(InheritsRelationId, RowExclusiveLock);
3536 :
3537 9524 : seqNumber = 1;
3538 19394 : foreach(entry, supers)
3539 : {
3540 9870 : Oid parentOid = lfirst_oid(entry);
3541 :
3542 9870 : StoreCatalogInheritance1(relationId, parentOid, seqNumber, relation,
3543 : child_is_partition);
3544 9870 : seqNumber++;
3545 : }
3546 :
3547 9524 : table_close(relation, RowExclusiveLock);
3548 : }
3549 :
3550 : /*
3551 : * Make catalog entries showing relationId as being an inheritance child
3552 : * of parentOid. inhRelation is the already-opened pg_inherits catalog.
3553 : */
3554 : static void
3555 12708 : StoreCatalogInheritance1(Oid relationId, Oid parentOid,
3556 : int32 seqNumber, Relation inhRelation,
3557 : bool child_is_partition)
3558 : {
3559 : ObjectAddress childobject,
3560 : parentobject;
3561 :
3562 : /* store the pg_inherits row */
3563 12708 : StoreSingleInheritance(relationId, parentOid, seqNumber);
3564 :
3565 : /*
3566 : * Store a dependency too
3567 : */
3568 12708 : parentobject.classId = RelationRelationId;
3569 12708 : parentobject.objectId = parentOid;
3570 12708 : parentobject.objectSubId = 0;
3571 12708 : childobject.classId = RelationRelationId;
3572 12708 : childobject.objectId = relationId;
3573 12708 : childobject.objectSubId = 0;
3574 :
3575 12708 : recordDependencyOn(&childobject, &parentobject,
3576 : child_dependency_type(child_is_partition));
3577 :
3578 : /*
3579 : * Post creation hook of this inheritance. Since object_access_hook
3580 : * doesn't take multiple object identifiers, we relay oid of parent
3581 : * relation using auxiliary_id argument.
3582 : */
3583 12708 : InvokeObjectPostAlterHookArg(InheritsRelationId,
3584 : relationId, 0,
3585 : parentOid, false);
3586 :
3587 : /*
3588 : * Mark the parent as having subclasses.
3589 : */
3590 12708 : SetRelationHasSubclass(parentOid, true);
3591 12708 : }
3592 :
3593 : /*
3594 : * Look for an existing column entry with the given name.
3595 : *
3596 : * Returns the index (starting with 1) if attribute already exists in columns,
3597 : * 0 if it doesn't.
3598 : */
3599 : static int
3600 21928 : findAttrByName(const char *attributeName, const List *columns)
3601 : {
3602 : ListCell *lc;
3603 21928 : int i = 1;
3604 :
3605 39314 : foreach(lc, columns)
3606 : {
3607 18204 : if (strcmp(attributeName, lfirst_node(ColumnDef, lc)->colname) == 0)
3608 818 : return i;
3609 :
3610 17386 : i++;
3611 : }
3612 21110 : return 0;
3613 : }
3614 :
3615 :
3616 : /*
3617 : * SetRelationHasSubclass
3618 : * Set the value of the relation's relhassubclass field in pg_class.
3619 : *
3620 : * It's always safe to set this field to true, because all SQL commands are
3621 : * ready to see true and then find no children. On the other hand, commands
3622 : * generally assume zero children if this is false.
3623 : *
3624 : * Caller must hold any self-exclusive lock until end of transaction. If the
3625 : * new value is false, caller must have acquired that lock before reading the
3626 : * evidence that justified the false value. That way, it properly waits if
3627 : * another backend is simultaneously concluding no need to change the tuple
3628 : * (new and old values are true).
3629 : *
3630 : * NOTE: an important side-effect of this operation is that an SI invalidation
3631 : * message is sent out to all backends --- including me --- causing plans
3632 : * referencing the relation to be rebuilt with the new list of children.
3633 : * This must happen even if we find that no change is needed in the pg_class
3634 : * row.
3635 : */
3636 : void
3637 15830 : SetRelationHasSubclass(Oid relationId, bool relhassubclass)
3638 : {
3639 : Relation relationRelation;
3640 : HeapTuple tuple;
3641 : Form_pg_class classtuple;
3642 :
3643 : Assert(CheckRelationOidLockedByMe(relationId,
3644 : ShareUpdateExclusiveLock, false) ||
3645 : CheckRelationOidLockedByMe(relationId,
3646 : ShareRowExclusiveLock, true));
3647 :
3648 : /*
3649 : * Fetch a modifiable copy of the tuple, modify it, update pg_class.
3650 : */
3651 15830 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
3652 15830 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relationId));
3653 15830 : if (!HeapTupleIsValid(tuple))
3654 0 : elog(ERROR, "cache lookup failed for relation %u", relationId);
3655 15830 : classtuple = (Form_pg_class) GETSTRUCT(tuple);
3656 :
3657 15830 : if (classtuple->relhassubclass != relhassubclass)
3658 : {
3659 7982 : classtuple->relhassubclass = relhassubclass;
3660 7982 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
3661 : }
3662 : else
3663 : {
3664 : /* no need to change tuple, but force relcache rebuild anyway */
3665 7848 : CacheInvalidateRelcacheByTuple(tuple);
3666 : }
3667 :
3668 15830 : heap_freetuple(tuple);
3669 15830 : table_close(relationRelation, RowExclusiveLock);
3670 15830 : }
3671 :
3672 : /*
3673 : * CheckRelationTableSpaceMove
3674 : * Check if relation can be moved to new tablespace.
3675 : *
3676 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3677 : *
3678 : * Returns true if the relation can be moved to the new tablespace; raises
3679 : * an error if it is not possible to do the move; returns false if the move
3680 : * would have no effect.
3681 : */
3682 : bool
3683 226 : CheckRelationTableSpaceMove(Relation rel, Oid newTableSpaceId)
3684 : {
3685 : Oid oldTableSpaceId;
3686 :
3687 : /*
3688 : * No work if no change in tablespace. Note that MyDatabaseTableSpace is
3689 : * stored as 0.
3690 : */
3691 226 : oldTableSpaceId = rel->rd_rel->reltablespace;
3692 226 : if (newTableSpaceId == oldTableSpaceId ||
3693 218 : (newTableSpaceId == MyDatabaseTableSpace && oldTableSpaceId == 0))
3694 10 : return false;
3695 :
3696 : /*
3697 : * We cannot support moving mapped relations into different tablespaces.
3698 : * (In particular this eliminates all shared catalogs.)
3699 : */
3700 216 : if (RelationIsMapped(rel))
3701 0 : ereport(ERROR,
3702 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3703 : errmsg("cannot move system relation \"%s\"",
3704 : RelationGetRelationName(rel))));
3705 :
3706 : /* Cannot move a non-shared relation into pg_global */
3707 216 : if (newTableSpaceId == GLOBALTABLESPACE_OID)
3708 12 : ereport(ERROR,
3709 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3710 : errmsg("only shared relations can be placed in pg_global tablespace")));
3711 :
3712 : /*
3713 : * Do not allow moving temp tables of other backends ... their local
3714 : * buffer manager is not going to cope.
3715 : */
3716 204 : if (RELATION_IS_OTHER_TEMP(rel))
3717 0 : ereport(ERROR,
3718 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3719 : errmsg("cannot move temporary tables of other sessions")));
3720 :
3721 204 : return true;
3722 : }
3723 :
3724 : /*
3725 : * SetRelationTableSpace
3726 : * Set new reltablespace and relfilenumber in pg_class entry.
3727 : *
3728 : * newTableSpaceId is the new tablespace for the relation, and
3729 : * newRelFilenumber its new filenumber. If newRelFilenumber is
3730 : * InvalidRelFileNumber, this field is not updated.
3731 : *
3732 : * NOTE: The caller must hold AccessExclusiveLock on the relation.
3733 : *
3734 : * The caller of this routine had better check if a relation can be
3735 : * moved to this new tablespace by calling CheckRelationTableSpaceMove()
3736 : * first, and is responsible for making the change visible with
3737 : * CommandCounterIncrement().
3738 : */
3739 : void
3740 204 : SetRelationTableSpace(Relation rel,
3741 : Oid newTableSpaceId,
3742 : RelFileNumber newRelFilenumber)
3743 : {
3744 : Relation pg_class;
3745 : HeapTuple tuple;
3746 : ItemPointerData otid;
3747 : Form_pg_class rd_rel;
3748 204 : Oid reloid = RelationGetRelid(rel);
3749 :
3750 : Assert(CheckRelationTableSpaceMove(rel, newTableSpaceId));
3751 :
3752 : /* Get a modifiable copy of the relation's pg_class row. */
3753 204 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
3754 :
3755 204 : tuple = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(reloid));
3756 204 : if (!HeapTupleIsValid(tuple))
3757 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
3758 204 : otid = tuple->t_self;
3759 204 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
3760 :
3761 : /* Update the pg_class row. */
3762 408 : rd_rel->reltablespace = (newTableSpaceId == MyDatabaseTableSpace) ?
3763 204 : InvalidOid : newTableSpaceId;
3764 204 : if (RelFileNumberIsValid(newRelFilenumber))
3765 160 : rd_rel->relfilenode = newRelFilenumber;
3766 204 : CatalogTupleUpdate(pg_class, &otid, tuple);
3767 204 : UnlockTuple(pg_class, &otid, InplaceUpdateTupleLock);
3768 :
3769 : /*
3770 : * Record dependency on tablespace. This is only required for relations
3771 : * that have no physical storage.
3772 : */
3773 204 : if (!RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
3774 30 : changeDependencyOnTablespace(RelationRelationId, reloid,
3775 : rd_rel->reltablespace);
3776 :
3777 204 : heap_freetuple(tuple);
3778 204 : table_close(pg_class, RowExclusiveLock);
3779 204 : }
3780 :
3781 : /*
3782 : * renameatt_check - basic sanity checks before attribute rename
3783 : */
3784 : static void
3785 1026 : renameatt_check(Oid myrelid, Form_pg_class classform, bool recursing)
3786 : {
3787 1026 : char relkind = classform->relkind;
3788 :
3789 1026 : if (classform->reloftype && !recursing)
3790 6 : ereport(ERROR,
3791 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3792 : errmsg("cannot rename column of typed table")));
3793 :
3794 : /*
3795 : * Renaming the columns of sequences or toast tables doesn't actually
3796 : * break anything from the system's point of view, since internal
3797 : * references are by attnum. But it doesn't seem right to allow users to
3798 : * change names that are hardcoded into the system, hence the following
3799 : * restriction.
3800 : */
3801 1020 : if (relkind != RELKIND_RELATION &&
3802 84 : relkind != RELKIND_VIEW &&
3803 84 : relkind != RELKIND_MATVIEW &&
3804 36 : relkind != RELKIND_COMPOSITE_TYPE &&
3805 36 : relkind != RELKIND_INDEX &&
3806 36 : relkind != RELKIND_PARTITIONED_INDEX &&
3807 0 : relkind != RELKIND_FOREIGN_TABLE &&
3808 : relkind != RELKIND_PARTITIONED_TABLE)
3809 0 : ereport(ERROR,
3810 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
3811 : errmsg("cannot rename columns of relation \"%s\"",
3812 : NameStr(classform->relname)),
3813 : errdetail_relkind_not_supported(relkind)));
3814 :
3815 : /*
3816 : * permissions checking. only the owner of a class can change its schema.
3817 : */
3818 1020 : if (!object_ownercheck(RelationRelationId, myrelid, GetUserId()))
3819 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(myrelid)),
3820 0 : NameStr(classform->relname));
3821 1020 : if (!allowSystemTableMods && IsSystemClass(myrelid, classform))
3822 2 : ereport(ERROR,
3823 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3824 : errmsg("permission denied: \"%s\" is a system catalog",
3825 : NameStr(classform->relname))));
3826 1018 : }
3827 :
3828 : /*
3829 : * renameatt_internal - workhorse for renameatt
3830 : *
3831 : * Return value is the attribute number in the 'myrelid' relation.
3832 : */
3833 : static AttrNumber
3834 552 : renameatt_internal(Oid myrelid,
3835 : const char *oldattname,
3836 : const char *newattname,
3837 : bool recurse,
3838 : bool recursing,
3839 : int expected_parents,
3840 : DropBehavior behavior)
3841 : {
3842 : Relation targetrelation;
3843 : Relation attrelation;
3844 : HeapTuple atttup;
3845 : Form_pg_attribute attform;
3846 : AttrNumber attnum;
3847 :
3848 : /*
3849 : * Grab an exclusive lock on the target table, which we will NOT release
3850 : * until end of transaction.
3851 : */
3852 552 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
3853 552 : renameatt_check(myrelid, RelationGetForm(targetrelation), recursing);
3854 :
3855 : /*
3856 : * if the 'recurse' flag is set then we are supposed to rename this
3857 : * attribute in all classes that inherit from 'relname' (as well as in
3858 : * 'relname').
3859 : *
3860 : * any permissions or problems with duplicate attributes will cause the
3861 : * whole transaction to abort, which is what we want -- all or nothing.
3862 : */
3863 552 : if (recurse)
3864 : {
3865 : List *child_oids,
3866 : *child_numparents;
3867 : ListCell *lo,
3868 : *li;
3869 :
3870 : /*
3871 : * we need the number of parents for each child so that the recursive
3872 : * calls to renameatt() can determine whether there are any parents
3873 : * outside the inheritance hierarchy being processed.
3874 : */
3875 248 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
3876 : &child_numparents);
3877 :
3878 : /*
3879 : * find_all_inheritors does the recursive search of the inheritance
3880 : * hierarchy, so all we have to do is process all of the relids in the
3881 : * list that it returns.
3882 : */
3883 734 : forboth(lo, child_oids, li, child_numparents)
3884 : {
3885 516 : Oid childrelid = lfirst_oid(lo);
3886 516 : int numparents = lfirst_int(li);
3887 :
3888 516 : if (childrelid == myrelid)
3889 248 : continue;
3890 : /* note we need not recurse again */
3891 268 : renameatt_internal(childrelid, oldattname, newattname, false, true, numparents, behavior);
3892 : }
3893 : }
3894 : else
3895 : {
3896 : /*
3897 : * If we are told not to recurse, there had better not be any child
3898 : * tables; else the rename would put them out of step.
3899 : *
3900 : * expected_parents will only be 0 if we are not already recursing.
3901 : */
3902 340 : if (expected_parents == 0 &&
3903 36 : find_inheritance_children(myrelid, NoLock) != NIL)
3904 12 : ereport(ERROR,
3905 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3906 : errmsg("inherited column \"%s\" must be renamed in child tables too",
3907 : oldattname)));
3908 : }
3909 :
3910 : /* rename attributes in typed tables of composite type */
3911 510 : if (targetrelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
3912 : {
3913 : List *child_oids;
3914 : ListCell *lo;
3915 :
3916 24 : child_oids = find_typed_table_dependencies(targetrelation->rd_rel->reltype,
3917 24 : RelationGetRelationName(targetrelation),
3918 : behavior);
3919 :
3920 24 : foreach(lo, child_oids)
3921 6 : renameatt_internal(lfirst_oid(lo), oldattname, newattname, true, true, 0, behavior);
3922 : }
3923 :
3924 504 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
3925 :
3926 504 : atttup = SearchSysCacheCopyAttName(myrelid, oldattname);
3927 504 : if (!HeapTupleIsValid(atttup))
3928 24 : ereport(ERROR,
3929 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3930 : errmsg("column \"%s\" does not exist",
3931 : oldattname)));
3932 480 : attform = (Form_pg_attribute) GETSTRUCT(atttup);
3933 :
3934 480 : attnum = attform->attnum;
3935 480 : if (attnum <= 0)
3936 0 : ereport(ERROR,
3937 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3938 : errmsg("cannot rename system column \"%s\"",
3939 : oldattname)));
3940 :
3941 : /*
3942 : * if the attribute is inherited, forbid the renaming. if this is a
3943 : * top-level call to renameatt(), then expected_parents will be 0, so the
3944 : * effect of this code will be to prohibit the renaming if the attribute
3945 : * is inherited at all. if this is a recursive call to renameatt(),
3946 : * expected_parents will be the number of parents the current relation has
3947 : * within the inheritance hierarchy being processed, so we'll prohibit the
3948 : * renaming only if there are additional parents from elsewhere.
3949 : */
3950 480 : if (attform->attinhcount > expected_parents)
3951 30 : ereport(ERROR,
3952 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
3953 : errmsg("cannot rename inherited column \"%s\"",
3954 : oldattname)));
3955 :
3956 : /* new name should not already exist */
3957 450 : (void) check_for_column_name_collision(targetrelation, newattname, false);
3958 :
3959 : /* apply the update */
3960 438 : namestrcpy(&(attform->attname), newattname);
3961 :
3962 438 : CatalogTupleUpdate(attrelation, &atttup->t_self, atttup);
3963 :
3964 438 : InvokeObjectPostAlterHook(RelationRelationId, myrelid, attnum);
3965 :
3966 438 : heap_freetuple(atttup);
3967 :
3968 438 : table_close(attrelation, RowExclusiveLock);
3969 :
3970 438 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
3971 :
3972 438 : return attnum;
3973 : }
3974 :
3975 : /*
3976 : * Perform permissions and integrity checks before acquiring a relation lock.
3977 : */
3978 : static void
3979 426 : RangeVarCallbackForRenameAttribute(const RangeVar *rv, Oid relid, Oid oldrelid,
3980 : void *arg)
3981 : {
3982 : HeapTuple tuple;
3983 : Form_pg_class form;
3984 :
3985 426 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
3986 426 : if (!HeapTupleIsValid(tuple))
3987 36 : return; /* concurrently dropped */
3988 390 : form = (Form_pg_class) GETSTRUCT(tuple);
3989 390 : renameatt_check(relid, form, false);
3990 382 : ReleaseSysCache(tuple);
3991 : }
3992 :
3993 : /*
3994 : * renameatt - changes the name of an attribute in a relation
3995 : *
3996 : * The returned ObjectAddress is that of the renamed column.
3997 : */
3998 : ObjectAddress
3999 316 : renameatt(RenameStmt *stmt)
4000 : {
4001 : Oid relid;
4002 : AttrNumber attnum;
4003 : ObjectAddress address;
4004 :
4005 : /* lock level taken here should match renameatt_internal */
4006 316 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4007 316 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4008 : RangeVarCallbackForRenameAttribute,
4009 : NULL);
4010 :
4011 302 : if (!OidIsValid(relid))
4012 : {
4013 24 : ereport(NOTICE,
4014 : (errmsg("relation \"%s\" does not exist, skipping",
4015 : stmt->relation->relname)));
4016 24 : return InvalidObjectAddress;
4017 : }
4018 :
4019 : attnum =
4020 278 : renameatt_internal(relid,
4021 278 : stmt->subname, /* old att name */
4022 278 : stmt->newname, /* new att name */
4023 278 : stmt->relation->inh, /* recursive? */
4024 : false, /* recursing? */
4025 : 0, /* expected inhcount */
4026 : stmt->behavior);
4027 :
4028 194 : ObjectAddressSubSet(address, RelationRelationId, relid, attnum);
4029 :
4030 194 : return address;
4031 : }
4032 :
4033 : /*
4034 : * same logic as renameatt_internal
4035 : */
4036 : static ObjectAddress
4037 90 : rename_constraint_internal(Oid myrelid,
4038 : Oid mytypid,
4039 : const char *oldconname,
4040 : const char *newconname,
4041 : bool recurse,
4042 : bool recursing,
4043 : int expected_parents)
4044 : {
4045 90 : Relation targetrelation = NULL;
4046 : Oid constraintOid;
4047 : HeapTuple tuple;
4048 : Form_pg_constraint con;
4049 : ObjectAddress address;
4050 :
4051 : Assert(!myrelid || !mytypid);
4052 :
4053 90 : if (mytypid)
4054 : {
4055 6 : constraintOid = get_domain_constraint_oid(mytypid, oldconname, false);
4056 : }
4057 : else
4058 : {
4059 84 : targetrelation = relation_open(myrelid, AccessExclusiveLock);
4060 :
4061 : /*
4062 : * don't tell it whether we're recursing; we allow changing typed
4063 : * tables here
4064 : */
4065 84 : renameatt_check(myrelid, RelationGetForm(targetrelation), false);
4066 :
4067 84 : constraintOid = get_relation_constraint_oid(myrelid, oldconname, false);
4068 : }
4069 :
4070 90 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
4071 90 : if (!HeapTupleIsValid(tuple))
4072 0 : elog(ERROR, "cache lookup failed for constraint %u",
4073 : constraintOid);
4074 90 : con = (Form_pg_constraint) GETSTRUCT(tuple);
4075 :
4076 90 : if (myrelid &&
4077 84 : (con->contype == CONSTRAINT_CHECK ||
4078 24 : con->contype == CONSTRAINT_NOTNULL) &&
4079 66 : !con->connoinherit)
4080 : {
4081 54 : if (recurse)
4082 : {
4083 : List *child_oids,
4084 : *child_numparents;
4085 : ListCell *lo,
4086 : *li;
4087 :
4088 36 : child_oids = find_all_inheritors(myrelid, AccessExclusiveLock,
4089 : &child_numparents);
4090 :
4091 84 : forboth(lo, child_oids, li, child_numparents)
4092 : {
4093 48 : Oid childrelid = lfirst_oid(lo);
4094 48 : int numparents = lfirst_int(li);
4095 :
4096 48 : if (childrelid == myrelid)
4097 36 : continue;
4098 :
4099 12 : rename_constraint_internal(childrelid, InvalidOid, oldconname, newconname, false, true, numparents);
4100 : }
4101 : }
4102 : else
4103 : {
4104 24 : if (expected_parents == 0 &&
4105 6 : find_inheritance_children(myrelid, NoLock) != NIL)
4106 6 : ereport(ERROR,
4107 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4108 : errmsg("inherited constraint \"%s\" must be renamed in child tables too",
4109 : oldconname)));
4110 : }
4111 :
4112 48 : if (con->coninhcount > expected_parents)
4113 6 : ereport(ERROR,
4114 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
4115 : errmsg("cannot rename inherited constraint \"%s\"",
4116 : oldconname)));
4117 : }
4118 :
4119 78 : if (con->conindid
4120 18 : && (con->contype == CONSTRAINT_PRIMARY
4121 6 : || con->contype == CONSTRAINT_UNIQUE
4122 0 : || con->contype == CONSTRAINT_EXCLUSION))
4123 : /* rename the index; this renames the constraint as well */
4124 18 : RenameRelationInternal(con->conindid, newconname, false, true);
4125 : else
4126 60 : RenameConstraintById(constraintOid, newconname);
4127 :
4128 78 : ObjectAddressSet(address, ConstraintRelationId, constraintOid);
4129 :
4130 78 : ReleaseSysCache(tuple);
4131 :
4132 78 : if (targetrelation)
4133 : {
4134 : /*
4135 : * Invalidate relcache so as others can see the new constraint name.
4136 : */
4137 72 : CacheInvalidateRelcache(targetrelation);
4138 :
4139 72 : relation_close(targetrelation, NoLock); /* close rel but keep lock */
4140 : }
4141 :
4142 78 : return address;
4143 : }
4144 :
4145 : ObjectAddress
4146 84 : RenameConstraint(RenameStmt *stmt)
4147 : {
4148 84 : Oid relid = InvalidOid;
4149 84 : Oid typid = InvalidOid;
4150 :
4151 84 : if (stmt->renameType == OBJECT_DOMCONSTRAINT)
4152 : {
4153 : Relation rel;
4154 : HeapTuple tup;
4155 :
4156 6 : typid = typenameTypeId(NULL, makeTypeNameFromNameList(castNode(List, stmt->object)));
4157 6 : rel = table_open(TypeRelationId, RowExclusiveLock);
4158 6 : tup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
4159 6 : if (!HeapTupleIsValid(tup))
4160 0 : elog(ERROR, "cache lookup failed for type %u", typid);
4161 6 : checkDomainOwner(tup);
4162 6 : ReleaseSysCache(tup);
4163 6 : table_close(rel, NoLock);
4164 : }
4165 : else
4166 : {
4167 : /* lock level taken here should match rename_constraint_internal */
4168 78 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
4169 78 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4170 : RangeVarCallbackForRenameAttribute,
4171 : NULL);
4172 78 : if (!OidIsValid(relid))
4173 : {
4174 6 : ereport(NOTICE,
4175 : (errmsg("relation \"%s\" does not exist, skipping",
4176 : stmt->relation->relname)));
4177 6 : return InvalidObjectAddress;
4178 : }
4179 : }
4180 :
4181 : return
4182 78 : rename_constraint_internal(relid, typid,
4183 78 : stmt->subname,
4184 78 : stmt->newname,
4185 150 : (stmt->relation &&
4186 72 : stmt->relation->inh), /* recursive? */
4187 : false, /* recursing? */
4188 : 0 /* expected inhcount */ );
4189 : }
4190 :
4191 : /*
4192 : * Execute ALTER TABLE/INDEX/SEQUENCE/VIEW/MATERIALIZED VIEW/FOREIGN TABLE
4193 : * RENAME
4194 : */
4195 : ObjectAddress
4196 510 : RenameRelation(RenameStmt *stmt)
4197 : {
4198 510 : bool is_index_stmt = stmt->renameType == OBJECT_INDEX;
4199 : Oid relid;
4200 : ObjectAddress address;
4201 :
4202 : /*
4203 : * Grab an exclusive lock on the target table, index, sequence, view,
4204 : * materialized view, or foreign table, which we will NOT release until
4205 : * end of transaction.
4206 : *
4207 : * Lock level used here should match RenameRelationInternal, to avoid lock
4208 : * escalation. However, because ALTER INDEX can be used with any relation
4209 : * type, we mustn't believe without verification.
4210 : */
4211 : for (;;)
4212 12 : {
4213 : LOCKMODE lockmode;
4214 : char relkind;
4215 : bool obj_is_index;
4216 :
4217 522 : lockmode = is_index_stmt ? ShareUpdateExclusiveLock : AccessExclusiveLock;
4218 :
4219 522 : relid = RangeVarGetRelidExtended(stmt->relation, lockmode,
4220 522 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4221 : RangeVarCallbackForAlterRelation,
4222 : stmt);
4223 :
4224 472 : if (!OidIsValid(relid))
4225 : {
4226 18 : ereport(NOTICE,
4227 : (errmsg("relation \"%s\" does not exist, skipping",
4228 : stmt->relation->relname)));
4229 18 : return InvalidObjectAddress;
4230 : }
4231 :
4232 : /*
4233 : * We allow mismatched statement and object types (e.g., ALTER INDEX
4234 : * to rename a table), but we might've used the wrong lock level. If
4235 : * that happens, retry with the correct lock level. We don't bother
4236 : * if we already acquired AccessExclusiveLock with an index, however.
4237 : */
4238 454 : relkind = get_rel_relkind(relid);
4239 454 : obj_is_index = (relkind == RELKIND_INDEX ||
4240 : relkind == RELKIND_PARTITIONED_INDEX);
4241 454 : if (obj_is_index || is_index_stmt == obj_is_index)
4242 : break;
4243 :
4244 12 : UnlockRelationOid(relid, lockmode);
4245 12 : is_index_stmt = obj_is_index;
4246 : }
4247 :
4248 : /* Do the work */
4249 442 : RenameRelationInternal(relid, stmt->newname, false, is_index_stmt);
4250 :
4251 430 : ObjectAddressSet(address, RelationRelationId, relid);
4252 :
4253 430 : return address;
4254 : }
4255 :
4256 : /*
4257 : * RenameRelationInternal - change the name of a relation
4258 : */
4259 : void
4260 1702 : RenameRelationInternal(Oid myrelid, const char *newrelname, bool is_internal, bool is_index)
4261 : {
4262 : Relation targetrelation;
4263 : Relation relrelation; /* for RELATION relation */
4264 : ItemPointerData otid;
4265 : HeapTuple reltup;
4266 : Form_pg_class relform;
4267 : Oid namespaceId;
4268 :
4269 : /*
4270 : * Grab a lock on the target relation, which we will NOT release until end
4271 : * of transaction. We need at least a self-exclusive lock so that
4272 : * concurrent DDL doesn't overwrite the rename if they start updating
4273 : * while still seeing the old version. The lock also guards against
4274 : * triggering relcache reloads in concurrent sessions, which might not
4275 : * handle this information changing under them. For indexes, we can use a
4276 : * reduced lock level because RelationReloadIndexInfo() handles indexes
4277 : * specially.
4278 : */
4279 1702 : targetrelation = relation_open(myrelid, is_index ? ShareUpdateExclusiveLock : AccessExclusiveLock);
4280 1702 : namespaceId = RelationGetNamespace(targetrelation);
4281 :
4282 : /*
4283 : * Find relation's pg_class tuple, and make sure newrelname isn't in use.
4284 : */
4285 1702 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4286 :
4287 1702 : reltup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(myrelid));
4288 1702 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4289 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4290 1702 : otid = reltup->t_self;
4291 1702 : relform = (Form_pg_class) GETSTRUCT(reltup);
4292 :
4293 1702 : if (get_relname_relid(newrelname, namespaceId) != InvalidOid)
4294 12 : ereport(ERROR,
4295 : (errcode(ERRCODE_DUPLICATE_TABLE),
4296 : errmsg("relation \"%s\" already exists",
4297 : newrelname)));
4298 :
4299 : /*
4300 : * RenameRelation is careful not to believe the caller's idea of the
4301 : * relation kind being handled. We don't have to worry about this, but
4302 : * let's not be totally oblivious to it. We can process an index as
4303 : * not-an-index, but not the other way around.
4304 : */
4305 : Assert(!is_index ||
4306 : is_index == (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4307 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX));
4308 :
4309 : /*
4310 : * Update pg_class tuple with new relname. (Scribbling on reltup is OK
4311 : * because it's a copy...)
4312 : */
4313 1690 : namestrcpy(&(relform->relname), newrelname);
4314 :
4315 1690 : CatalogTupleUpdate(relrelation, &otid, reltup);
4316 1690 : UnlockTuple(relrelation, &otid, InplaceUpdateTupleLock);
4317 :
4318 1690 : InvokeObjectPostAlterHookArg(RelationRelationId, myrelid, 0,
4319 : InvalidOid, is_internal);
4320 :
4321 1690 : heap_freetuple(reltup);
4322 1690 : table_close(relrelation, RowExclusiveLock);
4323 :
4324 : /*
4325 : * Also rename the associated type, if any.
4326 : */
4327 1690 : if (OidIsValid(targetrelation->rd_rel->reltype))
4328 124 : RenameTypeInternal(targetrelation->rd_rel->reltype,
4329 : newrelname, namespaceId);
4330 :
4331 : /*
4332 : * Also rename the associated constraint, if any.
4333 : */
4334 1690 : if (targetrelation->rd_rel->relkind == RELKIND_INDEX ||
4335 886 : targetrelation->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
4336 : {
4337 822 : Oid constraintId = get_index_constraint(myrelid);
4338 :
4339 822 : if (OidIsValid(constraintId))
4340 36 : RenameConstraintById(constraintId, newrelname);
4341 : }
4342 :
4343 : /*
4344 : * Close rel, but keep lock!
4345 : */
4346 1690 : relation_close(targetrelation, NoLock);
4347 1690 : }
4348 :
4349 : /*
4350 : * ResetRelRewrite - reset relrewrite
4351 : */
4352 : void
4353 610 : ResetRelRewrite(Oid myrelid)
4354 : {
4355 : Relation relrelation; /* for RELATION relation */
4356 : HeapTuple reltup;
4357 : Form_pg_class relform;
4358 :
4359 : /*
4360 : * Find relation's pg_class tuple.
4361 : */
4362 610 : relrelation = table_open(RelationRelationId, RowExclusiveLock);
4363 :
4364 610 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
4365 610 : if (!HeapTupleIsValid(reltup)) /* shouldn't happen */
4366 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
4367 610 : relform = (Form_pg_class) GETSTRUCT(reltup);
4368 :
4369 : /*
4370 : * Update pg_class tuple.
4371 : */
4372 610 : relform->relrewrite = InvalidOid;
4373 :
4374 610 : CatalogTupleUpdate(relrelation, &reltup->t_self, reltup);
4375 :
4376 610 : heap_freetuple(reltup);
4377 610 : table_close(relrelation, RowExclusiveLock);
4378 610 : }
4379 :
4380 : /*
4381 : * Disallow ALTER TABLE (and similar commands) when the current backend has
4382 : * any open reference to the target table besides the one just acquired by
4383 : * the calling command; this implies there's an open cursor or active plan.
4384 : * We need this check because our lock doesn't protect us against stomping
4385 : * on our own foot, only other people's feet!
4386 : *
4387 : * For ALTER TABLE, the only case known to cause serious trouble is ALTER
4388 : * COLUMN TYPE, and some changes are obviously pretty benign, so this could
4389 : * possibly be relaxed to only error out for certain types of alterations.
4390 : * But the use-case for allowing any of these things is not obvious, so we
4391 : * won't work hard at it for now.
4392 : *
4393 : * We also reject these commands if there are any pending AFTER trigger events
4394 : * for the rel. This is certainly necessary for the rewriting variants of
4395 : * ALTER TABLE, because they don't preserve tuple TIDs and so the pending
4396 : * events would try to fetch the wrong tuples. It might be overly cautious
4397 : * in other cases, but again it seems better to err on the side of paranoia.
4398 : *
4399 : * REINDEX calls this with "rel" referencing the index to be rebuilt; here
4400 : * we are worried about active indexscans on the index. The trigger-event
4401 : * check can be skipped, since we are doing no damage to the parent table.
4402 : *
4403 : * The statement name (eg, "ALTER TABLE") is passed for use in error messages.
4404 : */
4405 : void
4406 171924 : CheckTableNotInUse(Relation rel, const char *stmt)
4407 : {
4408 : int expected_refcnt;
4409 :
4410 171924 : expected_refcnt = rel->rd_isnailed ? 2 : 1;
4411 171924 : if (rel->rd_refcnt != expected_refcnt)
4412 42 : ereport(ERROR,
4413 : (errcode(ERRCODE_OBJECT_IN_USE),
4414 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4415 : errmsg("cannot %s \"%s\" because it is being used by active queries in this session",
4416 : stmt, RelationGetRelationName(rel))));
4417 :
4418 171882 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
4419 280804 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
4420 139316 : AfterTriggerPendingOnRel(RelationGetRelid(rel)))
4421 18 : ereport(ERROR,
4422 : (errcode(ERRCODE_OBJECT_IN_USE),
4423 : /* translator: first %s is a SQL command, eg ALTER TABLE */
4424 : errmsg("cannot %s \"%s\" because it has pending trigger events",
4425 : stmt, RelationGetRelationName(rel))));
4426 171864 : }
4427 :
4428 : /*
4429 : * CheckAlterTableIsSafe
4430 : * Verify that it's safe to allow ALTER TABLE on this relation.
4431 : *
4432 : * This consists of CheckTableNotInUse() plus a check that the relation
4433 : * isn't another session's temp table. We must split out the temp-table
4434 : * check because there are callers of CheckTableNotInUse() that don't want
4435 : * that, notably DROP TABLE. (We must allow DROP or we couldn't clean out
4436 : * an orphaned temp schema.) Compare truncate_check_activity().
4437 : */
4438 : static void
4439 63282 : CheckAlterTableIsSafe(Relation rel)
4440 : {
4441 : /*
4442 : * Don't allow ALTER on temp tables of other backends. Their local buffer
4443 : * manager is not going to cope if we need to change the table's contents.
4444 : * Even if we don't, there may be optimizations that assume temp tables
4445 : * aren't subject to such interference.
4446 : */
4447 63282 : if (RELATION_IS_OTHER_TEMP(rel))
4448 0 : ereport(ERROR,
4449 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4450 : errmsg("cannot alter temporary tables of other sessions")));
4451 :
4452 : /*
4453 : * Also check for active uses of the relation in the current transaction,
4454 : * including open scans and pending AFTER trigger events.
4455 : */
4456 63282 : CheckTableNotInUse(rel, "ALTER TABLE");
4457 63246 : }
4458 :
4459 : /*
4460 : * AlterTableLookupRelation
4461 : * Look up, and lock, the OID for the relation named by an alter table
4462 : * statement.
4463 : */
4464 : Oid
4465 34256 : AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
4466 : {
4467 68424 : return RangeVarGetRelidExtended(stmt->relation, lockmode,
4468 34256 : stmt->missing_ok ? RVR_MISSING_OK : 0,
4469 : RangeVarCallbackForAlterRelation,
4470 : stmt);
4471 : }
4472 :
4473 : /*
4474 : * AlterTable
4475 : * Execute ALTER TABLE, which can be a list of subcommands
4476 : *
4477 : * ALTER TABLE is performed in three phases:
4478 : * 1. Examine subcommands and perform pre-transformation checking.
4479 : * 2. Validate and transform subcommands, and update system catalogs.
4480 : * 3. Scan table(s) to check new constraints, and optionally recopy
4481 : * the data into new table(s).
4482 : * Phase 3 is not performed unless one or more of the subcommands requires
4483 : * it. The intention of this design is to allow multiple independent
4484 : * updates of the table schema to be performed with only one pass over the
4485 : * data.
4486 : *
4487 : * ATPrepCmd performs phase 1. A "work queue" entry is created for
4488 : * each table to be affected (there may be multiple affected tables if the
4489 : * commands traverse a table inheritance hierarchy). Also we do preliminary
4490 : * validation of the subcommands. Because earlier subcommands may change
4491 : * the catalog state seen by later commands, there are limits to what can
4492 : * be done in this phase. Generally, this phase acquires table locks,
4493 : * checks permissions and relkind, and recurses to find child tables.
4494 : *
4495 : * ATRewriteCatalogs performs phase 2 for each affected table.
4496 : * Certain subcommands need to be performed before others to avoid
4497 : * unnecessary conflicts; for example, DROP COLUMN should come before
4498 : * ADD COLUMN. Therefore phase 1 divides the subcommands into multiple
4499 : * lists, one for each logical "pass" of phase 2.
4500 : *
4501 : * ATRewriteTables performs phase 3 for those tables that need it.
4502 : *
4503 : * For most subcommand types, phases 2 and 3 do no explicit recursion,
4504 : * since phase 1 already does it. However, for certain subcommand types
4505 : * it is only possible to determine how to recurse at phase 2 time; for
4506 : * those cases, phase 1 sets the cmd->recurse flag.
4507 : *
4508 : * Thanks to the magic of MVCC, an error anywhere along the way rolls back
4509 : * the whole operation; we don't have to do anything special to clean up.
4510 : *
4511 : * The caller must lock the relation, with an appropriate lock level
4512 : * for the subcommands requested, using AlterTableGetLockLevel(stmt->cmds)
4513 : * or higher. We pass the lock level down
4514 : * so that we can apply it recursively to inherited tables. Note that the
4515 : * lock level we want as we recurse might well be higher than required for
4516 : * that specific subcommand. So we pass down the overall lock requirement,
4517 : * rather than reassess it at lower levels.
4518 : *
4519 : * The caller also provides a "context" which is to be passed back to
4520 : * utility.c when we need to execute a subcommand such as CREATE INDEX.
4521 : * Some of the fields therein, such as the relid, are used here as well.
4522 : */
4523 : void
4524 34030 : AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
4525 : AlterTableUtilityContext *context)
4526 : {
4527 : Relation rel;
4528 :
4529 : /* Caller is required to provide an adequate lock. */
4530 34030 : rel = relation_open(context->relid, NoLock);
4531 :
4532 34030 : CheckAlterTableIsSafe(rel);
4533 :
4534 34012 : ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
4535 30358 : }
4536 :
4537 : /*
4538 : * AlterTableInternal
4539 : *
4540 : * ALTER TABLE with target specified by OID
4541 : *
4542 : * We do not reject if the relation is already open, because it's quite
4543 : * likely that one or more layers of caller have it open. That means it
4544 : * is unsafe to use this entry point for alterations that could break
4545 : * existing query plans. On the assumption it's not used for such, we
4546 : * don't have to reject pending AFTER triggers, either.
4547 : *
4548 : * Also, since we don't have an AlterTableUtilityContext, this cannot be
4549 : * used for any subcommand types that require parse transformation or
4550 : * could generate subcommands that have to be passed to ProcessUtility.
4551 : */
4552 : void
4553 282 : AlterTableInternal(Oid relid, List *cmds, bool recurse)
4554 : {
4555 : Relation rel;
4556 282 : LOCKMODE lockmode = AlterTableGetLockLevel(cmds);
4557 :
4558 282 : rel = relation_open(relid, lockmode);
4559 :
4560 282 : EventTriggerAlterTableRelid(relid);
4561 :
4562 282 : ATController(NULL, rel, cmds, recurse, lockmode, NULL);
4563 282 : }
4564 :
4565 : /*
4566 : * AlterTableGetLockLevel
4567 : *
4568 : * Sets the overall lock level required for the supplied list of subcommands.
4569 : * Policy for doing this set according to needs of AlterTable(), see
4570 : * comments there for overall explanation.
4571 : *
4572 : * Function is called before and after parsing, so it must give same
4573 : * answer each time it is called. Some subcommands are transformed
4574 : * into other subcommand types, so the transform must never be made to a
4575 : * lower lock level than previously assigned. All transforms are noted below.
4576 : *
4577 : * Since this is called before we lock the table we cannot use table metadata
4578 : * to influence the type of lock we acquire.
4579 : *
4580 : * There should be no lockmodes hardcoded into the subcommand functions. All
4581 : * lockmode decisions for ALTER TABLE are made here only. The one exception is
4582 : * ALTER TABLE RENAME which is treated as a different statement type T_RenameStmt
4583 : * and does not travel through this section of code and cannot be combined with
4584 : * any of the subcommands given here.
4585 : *
4586 : * Note that Hot Standby only knows about AccessExclusiveLocks on the primary
4587 : * so any changes that might affect SELECTs running on standbys need to use
4588 : * AccessExclusiveLocks even if you think a lesser lock would do, unless you
4589 : * have a solution for that also.
4590 : *
4591 : * Also note that pg_dump uses only an AccessShareLock, meaning that anything
4592 : * that takes a lock less than AccessExclusiveLock can change object definitions
4593 : * while pg_dump is running. Be careful to check that the appropriate data is
4594 : * derived by pg_dump using an MVCC snapshot, rather than syscache lookups,
4595 : * otherwise we might end up with an inconsistent dump that can't restore.
4596 : */
4597 : LOCKMODE
4598 34538 : AlterTableGetLockLevel(List *cmds)
4599 : {
4600 : /*
4601 : * This only works if we read catalog tables using MVCC snapshots.
4602 : */
4603 : ListCell *lcmd;
4604 34538 : LOCKMODE lockmode = ShareUpdateExclusiveLock;
4605 :
4606 70248 : foreach(lcmd, cmds)
4607 : {
4608 35710 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4609 35710 : LOCKMODE cmd_lockmode = AccessExclusiveLock; /* default for compiler */
4610 :
4611 35710 : switch (cmd->subtype)
4612 : {
4613 : /*
4614 : * These subcommands rewrite the heap, so require full locks.
4615 : */
4616 3560 : case AT_AddColumn: /* may rewrite heap, in some cases and visible
4617 : * to SELECT */
4618 : case AT_SetAccessMethod: /* must rewrite heap */
4619 : case AT_SetTableSpace: /* must rewrite heap */
4620 : case AT_AlterColumnType: /* must rewrite heap */
4621 3560 : cmd_lockmode = AccessExclusiveLock;
4622 3560 : break;
4623 :
4624 : /*
4625 : * These subcommands may require addition of toast tables. If
4626 : * we add a toast table to a table currently being scanned, we
4627 : * might miss data added to the new toast table by concurrent
4628 : * insert transactions.
4629 : */
4630 224 : case AT_SetStorage: /* may add toast tables, see
4631 : * ATRewriteCatalogs() */
4632 224 : cmd_lockmode = AccessExclusiveLock;
4633 224 : break;
4634 :
4635 : /*
4636 : * Removing constraints can affect SELECTs that have been
4637 : * optimized assuming the constraint holds true. See also
4638 : * CloneFkReferenced.
4639 : */
4640 1110 : case AT_DropConstraint: /* as DROP INDEX */
4641 : case AT_DropNotNull: /* may change some SQL plans */
4642 1110 : cmd_lockmode = AccessExclusiveLock;
4643 1110 : break;
4644 :
4645 : /*
4646 : * Subcommands that may be visible to concurrent SELECTs
4647 : */
4648 1758 : case AT_DropColumn: /* change visible to SELECT */
4649 : case AT_AddColumnToView: /* CREATE VIEW */
4650 : case AT_DropOids: /* used to equiv to DropColumn */
4651 : case AT_EnableAlwaysRule: /* may change SELECT rules */
4652 : case AT_EnableReplicaRule: /* may change SELECT rules */
4653 : case AT_EnableRule: /* may change SELECT rules */
4654 : case AT_DisableRule: /* may change SELECT rules */
4655 1758 : cmd_lockmode = AccessExclusiveLock;
4656 1758 : break;
4657 :
4658 : /*
4659 : * Changing owner may remove implicit SELECT privileges
4660 : */
4661 3598 : case AT_ChangeOwner: /* change visible to SELECT */
4662 3598 : cmd_lockmode = AccessExclusiveLock;
4663 3598 : break;
4664 :
4665 : /*
4666 : * Changing foreign table options may affect optimization.
4667 : */
4668 254 : case AT_GenericOptions:
4669 : case AT_AlterColumnGenericOptions:
4670 254 : cmd_lockmode = AccessExclusiveLock;
4671 254 : break;
4672 :
4673 : /*
4674 : * These subcommands affect write operations only.
4675 : */
4676 346 : case AT_EnableTrig:
4677 : case AT_EnableAlwaysTrig:
4678 : case AT_EnableReplicaTrig:
4679 : case AT_EnableTrigAll:
4680 : case AT_EnableTrigUser:
4681 : case AT_DisableTrig:
4682 : case AT_DisableTrigAll:
4683 : case AT_DisableTrigUser:
4684 346 : cmd_lockmode = ShareRowExclusiveLock;
4685 346 : break;
4686 :
4687 : /*
4688 : * These subcommands affect write operations only. XXX
4689 : * Theoretically, these could be ShareRowExclusiveLock.
4690 : */
4691 2934 : case AT_ColumnDefault:
4692 : case AT_CookedColumnDefault:
4693 : case AT_AlterConstraint:
4694 : case AT_AddIndex: /* from ADD CONSTRAINT */
4695 : case AT_AddIndexConstraint:
4696 : case AT_ReplicaIdentity:
4697 : case AT_SetNotNull:
4698 : case AT_EnableRowSecurity:
4699 : case AT_DisableRowSecurity:
4700 : case AT_ForceRowSecurity:
4701 : case AT_NoForceRowSecurity:
4702 : case AT_AddIdentity:
4703 : case AT_DropIdentity:
4704 : case AT_SetIdentity:
4705 : case AT_SetExpression:
4706 : case AT_DropExpression:
4707 : case AT_SetCompression:
4708 2934 : cmd_lockmode = AccessExclusiveLock;
4709 2934 : break;
4710 :
4711 15618 : case AT_AddConstraint:
4712 : case AT_ReAddConstraint: /* becomes AT_AddConstraint */
4713 : case AT_ReAddDomainConstraint: /* becomes AT_AddConstraint */
4714 15618 : if (IsA(cmd->def, Constraint))
4715 : {
4716 15618 : Constraint *con = (Constraint *) cmd->def;
4717 :
4718 15618 : switch (con->contype)
4719 : {
4720 11956 : case CONSTR_EXCLUSION:
4721 : case CONSTR_PRIMARY:
4722 : case CONSTR_UNIQUE:
4723 :
4724 : /*
4725 : * Cases essentially the same as CREATE INDEX. We
4726 : * could reduce the lock strength to ShareLock if
4727 : * we can work out how to allow concurrent catalog
4728 : * updates. XXX Might be set down to
4729 : * ShareRowExclusiveLock but requires further
4730 : * analysis.
4731 : */
4732 11956 : cmd_lockmode = AccessExclusiveLock;
4733 11956 : break;
4734 2560 : case CONSTR_FOREIGN:
4735 :
4736 : /*
4737 : * We add triggers to both tables when we add a
4738 : * Foreign Key, so the lock level must be at least
4739 : * as strong as CREATE TRIGGER.
4740 : */
4741 2560 : cmd_lockmode = ShareRowExclusiveLock;
4742 2560 : break;
4743 :
4744 1102 : default:
4745 1102 : cmd_lockmode = AccessExclusiveLock;
4746 : }
4747 0 : }
4748 15618 : break;
4749 :
4750 : /*
4751 : * These subcommands affect inheritance behaviour. Queries
4752 : * started before us will continue to see the old inheritance
4753 : * behaviour, while queries started after we commit will see
4754 : * new behaviour. No need to prevent reads or writes to the
4755 : * subtable while we hook it up though. Changing the TupDesc
4756 : * may be a problem, so keep highest lock.
4757 : */
4758 530 : case AT_AddInherit:
4759 : case AT_DropInherit:
4760 530 : cmd_lockmode = AccessExclusiveLock;
4761 530 : break;
4762 :
4763 : /*
4764 : * These subcommands affect implicit row type conversion. They
4765 : * have affects similar to CREATE/DROP CAST on queries. don't
4766 : * provide for invalidating parse trees as a result of such
4767 : * changes, so we keep these at AccessExclusiveLock.
4768 : */
4769 72 : case AT_AddOf:
4770 : case AT_DropOf:
4771 72 : cmd_lockmode = AccessExclusiveLock;
4772 72 : break;
4773 :
4774 : /*
4775 : * Only used by CREATE OR REPLACE VIEW which must conflict
4776 : * with an SELECTs currently using the view.
4777 : */
4778 198 : case AT_ReplaceRelOptions:
4779 198 : cmd_lockmode = AccessExclusiveLock;
4780 198 : break;
4781 :
4782 : /*
4783 : * These subcommands affect general strategies for performance
4784 : * and maintenance, though don't change the semantic results
4785 : * from normal data reads and writes. Delaying an ALTER TABLE
4786 : * behind currently active writes only delays the point where
4787 : * the new strategy begins to take effect, so there is no
4788 : * benefit in waiting. In this case the minimum restriction
4789 : * applies: we don't currently allow concurrent catalog
4790 : * updates.
4791 : */
4792 234 : case AT_SetStatistics: /* Uses MVCC in getTableAttrs() */
4793 : case AT_ClusterOn: /* Uses MVCC in getIndexes() */
4794 : case AT_DropCluster: /* Uses MVCC in getIndexes() */
4795 : case AT_SetOptions: /* Uses MVCC in getTableAttrs() */
4796 : case AT_ResetOptions: /* Uses MVCC in getTableAttrs() */
4797 234 : cmd_lockmode = ShareUpdateExclusiveLock;
4798 234 : break;
4799 :
4800 112 : case AT_SetLogged:
4801 : case AT_SetUnLogged:
4802 112 : cmd_lockmode = AccessExclusiveLock;
4803 112 : break;
4804 :
4805 464 : case AT_ValidateConstraint: /* Uses MVCC in getConstraints() */
4806 464 : cmd_lockmode = ShareUpdateExclusiveLock;
4807 464 : break;
4808 :
4809 : /*
4810 : * Rel options are more complex than first appears. Options
4811 : * are set here for tables, views and indexes; for historical
4812 : * reasons these can all be used with ALTER TABLE, so we can't
4813 : * decide between them using the basic grammar.
4814 : */
4815 764 : case AT_SetRelOptions: /* Uses MVCC in getIndexes() and
4816 : * getTables() */
4817 : case AT_ResetRelOptions: /* Uses MVCC in getIndexes() and
4818 : * getTables() */
4819 764 : cmd_lockmode = AlterTableGetRelOptionsLockLevel((List *) cmd->def);
4820 764 : break;
4821 :
4822 3326 : case AT_AttachPartition:
4823 3326 : cmd_lockmode = ShareUpdateExclusiveLock;
4824 3326 : break;
4825 :
4826 588 : case AT_DetachPartition:
4827 588 : if (((PartitionCmd *) cmd->def)->concurrent)
4828 164 : cmd_lockmode = ShareUpdateExclusiveLock;
4829 : else
4830 424 : cmd_lockmode = AccessExclusiveLock;
4831 588 : break;
4832 :
4833 20 : case AT_DetachPartitionFinalize:
4834 20 : cmd_lockmode = ShareUpdateExclusiveLock;
4835 20 : break;
4836 :
4837 0 : default: /* oops */
4838 0 : elog(ERROR, "unrecognized alter table type: %d",
4839 : (int) cmd->subtype);
4840 : break;
4841 : }
4842 :
4843 : /*
4844 : * Take the greatest lockmode from any subcommand
4845 : */
4846 35710 : if (cmd_lockmode > lockmode)
4847 29754 : lockmode = cmd_lockmode;
4848 : }
4849 :
4850 34538 : return lockmode;
4851 : }
4852 :
4853 : /*
4854 : * ATController provides top level control over the phases.
4855 : *
4856 : * parsetree is passed in to allow it to be passed to event triggers
4857 : * when requested.
4858 : */
4859 : static void
4860 34294 : ATController(AlterTableStmt *parsetree,
4861 : Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
4862 : AlterTableUtilityContext *context)
4863 : {
4864 34294 : List *wqueue = NIL;
4865 : ListCell *lcmd;
4866 :
4867 : /* Phase 1: preliminary examination of commands, create work queue */
4868 69354 : foreach(lcmd, cmds)
4869 : {
4870 35460 : AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
4871 :
4872 35460 : ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode, context);
4873 : }
4874 :
4875 : /* Close the relation, but keep lock until commit */
4876 33894 : relation_close(rel, NoLock);
4877 :
4878 : /* Phase 2: update system catalogs */
4879 33894 : ATRewriteCatalogs(&wqueue, lockmode, context);
4880 :
4881 : /* Phase 3: scan/rewrite tables as needed, and run afterStmts */
4882 31078 : ATRewriteTables(parsetree, &wqueue, lockmode, context);
4883 30640 : }
4884 :
4885 : /*
4886 : * ATPrepCmd
4887 : *
4888 : * Traffic cop for ALTER TABLE Phase 1 operations, including simple
4889 : * recursion and permission checks.
4890 : *
4891 : * Caller must have acquired appropriate lock type on relation already.
4892 : * This lock should be held until commit.
4893 : */
4894 : static void
4895 36400 : ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
4896 : bool recurse, bool recursing, LOCKMODE lockmode,
4897 : AlterTableUtilityContext *context)
4898 : {
4899 : AlteredTableInfo *tab;
4900 36400 : AlterTablePass pass = AT_PASS_UNSET;
4901 :
4902 : /* Find or create work queue entry for this table */
4903 36400 : tab = ATGetQueueEntry(wqueue, rel);
4904 :
4905 : /*
4906 : * Disallow any ALTER TABLE other than ALTER TABLE DETACH FINALIZE on
4907 : * partitions that are pending detach.
4908 : */
4909 36400 : if (rel->rd_rel->relispartition &&
4910 3080 : cmd->subtype != AT_DetachPartitionFinalize &&
4911 1540 : PartitionHasPendingDetach(RelationGetRelid(rel)))
4912 2 : ereport(ERROR,
4913 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
4914 : errmsg("cannot alter partition \"%s\" with an incomplete detach",
4915 : RelationGetRelationName(rel)),
4916 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
4917 :
4918 : /*
4919 : * Copy the original subcommand for each table, so we can scribble on it.
4920 : * This avoids conflicts when different child tables need to make
4921 : * different parse transformations (for example, the same column may have
4922 : * different column numbers in different children).
4923 : */
4924 36398 : cmd = copyObject(cmd);
4925 :
4926 : /*
4927 : * Do permissions and relkind checking, recursion to child tables if
4928 : * needed, and any additional phase-1 processing needed. (But beware of
4929 : * adding any processing that looks at table details that another
4930 : * subcommand could change. In some cases we reject multiple subcommands
4931 : * that could try to change the same state in contrary ways.)
4932 : */
4933 36398 : switch (cmd->subtype)
4934 : {
4935 2158 : case AT_AddColumn: /* ADD COLUMN */
4936 2158 : ATSimplePermissions(cmd->subtype, rel,
4937 : ATT_TABLE | ATT_PARTITIONED_TABLE |
4938 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
4939 2158 : ATPrepAddColumn(wqueue, rel, recurse, recursing, false, cmd,
4940 : lockmode, context);
4941 : /* Recursion occurs during execution phase */
4942 2146 : pass = AT_PASS_ADD_COL;
4943 2146 : break;
4944 24 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
4945 24 : ATSimplePermissions(cmd->subtype, rel, ATT_VIEW);
4946 24 : ATPrepAddColumn(wqueue, rel, recurse, recursing, true, cmd,
4947 : lockmode, context);
4948 : /* Recursion occurs during execution phase */
4949 24 : pass = AT_PASS_ADD_COL;
4950 24 : break;
4951 648 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
4952 :
4953 : /*
4954 : * We allow defaults on views so that INSERT into a view can have
4955 : * default-ish behavior. This works because the rewriter
4956 : * substitutes default values into INSERTs before it expands
4957 : * rules.
4958 : */
4959 648 : ATSimplePermissions(cmd->subtype, rel,
4960 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4961 : ATT_FOREIGN_TABLE);
4962 648 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
4963 : /* No command-specific prep needed */
4964 648 : pass = cmd->def ? AT_PASS_ADD_OTHERCONSTR : AT_PASS_DROP;
4965 648 : break;
4966 80 : case AT_CookedColumnDefault: /* add a pre-cooked default */
4967 : /* This is currently used only in CREATE TABLE */
4968 : /* (so the permission check really isn't necessary) */
4969 80 : ATSimplePermissions(cmd->subtype, rel,
4970 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
4971 : /* This command never recurses */
4972 80 : pass = AT_PASS_ADD_OTHERCONSTR;
4973 80 : break;
4974 210 : case AT_AddIdentity:
4975 210 : ATSimplePermissions(cmd->subtype, rel,
4976 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4977 : ATT_FOREIGN_TABLE);
4978 : /* Set up recursion for phase 2; no other prep needed */
4979 210 : if (recurse)
4980 204 : cmd->recurse = true;
4981 210 : pass = AT_PASS_ADD_OTHERCONSTR;
4982 210 : break;
4983 62 : case AT_SetIdentity:
4984 62 : ATSimplePermissions(cmd->subtype, rel,
4985 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4986 : ATT_FOREIGN_TABLE);
4987 : /* Set up recursion for phase 2; no other prep needed */
4988 62 : if (recurse)
4989 56 : cmd->recurse = true;
4990 : /* This should run after AddIdentity, so do it in MISC pass */
4991 62 : pass = AT_PASS_MISC;
4992 62 : break;
4993 56 : case AT_DropIdentity:
4994 56 : ATSimplePermissions(cmd->subtype, rel,
4995 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
4996 : ATT_FOREIGN_TABLE);
4997 : /* Set up recursion for phase 2; no other prep needed */
4998 56 : if (recurse)
4999 50 : cmd->recurse = true;
5000 56 : pass = AT_PASS_DROP;
5001 56 : break;
5002 274 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5003 274 : ATSimplePermissions(cmd->subtype, rel,
5004 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5005 : /* Set up recursion for phase 2; no other prep needed */
5006 268 : if (recurse)
5007 250 : cmd->recurse = true;
5008 268 : pass = AT_PASS_DROP;
5009 268 : break;
5010 414 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5011 414 : ATSimplePermissions(cmd->subtype, rel,
5012 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5013 : /* Set up recursion for phase 2; no other prep needed */
5014 408 : if (recurse)
5015 384 : cmd->recurse = true;
5016 408 : pass = AT_PASS_COL_ATTRS;
5017 408 : break;
5018 180 : case AT_SetExpression: /* ALTER COLUMN SET EXPRESSION */
5019 180 : ATSimplePermissions(cmd->subtype, rel,
5020 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5021 180 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5022 180 : pass = AT_PASS_SET_EXPRESSION;
5023 180 : break;
5024 86 : case AT_DropExpression: /* ALTER COLUMN DROP EXPRESSION */
5025 86 : ATSimplePermissions(cmd->subtype, rel,
5026 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5027 86 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5028 86 : ATPrepDropExpression(rel, cmd, recurse, recursing, lockmode);
5029 62 : pass = AT_PASS_DROP;
5030 62 : break;
5031 164 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5032 164 : ATSimplePermissions(cmd->subtype, rel,
5033 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW |
5034 : ATT_INDEX | ATT_PARTITIONED_INDEX | ATT_FOREIGN_TABLE);
5035 164 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5036 : /* No command-specific prep needed */
5037 164 : pass = AT_PASS_MISC;
5038 164 : break;
5039 44 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5040 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5041 44 : ATSimplePermissions(cmd->subtype, rel,
5042 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5043 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5044 : /* This command never recurses */
5045 32 : pass = AT_PASS_MISC;
5046 32 : break;
5047 246 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5048 246 : ATSimplePermissions(cmd->subtype, rel,
5049 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5050 : ATT_MATVIEW | ATT_FOREIGN_TABLE);
5051 246 : ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
5052 : /* No command-specific prep needed */
5053 246 : pass = AT_PASS_MISC;
5054 246 : break;
5055 90 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5056 90 : ATSimplePermissions(cmd->subtype, rel,
5057 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5058 : /* This command never recurses */
5059 : /* No command-specific prep needed */
5060 90 : pass = AT_PASS_MISC;
5061 90 : break;
5062 1658 : case AT_DropColumn: /* DROP COLUMN */
5063 1658 : ATSimplePermissions(cmd->subtype, rel,
5064 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5065 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5066 1652 : ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd,
5067 : lockmode, context);
5068 : /* Recursion occurs during execution phase */
5069 1640 : pass = AT_PASS_DROP;
5070 1640 : break;
5071 0 : case AT_AddIndex: /* ADD INDEX */
5072 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5073 : /* This command never recurses */
5074 : /* No command-specific prep needed */
5075 0 : pass = AT_PASS_ADD_INDEX;
5076 0 : break;
5077 16082 : case AT_AddConstraint: /* ADD CONSTRAINT */
5078 16082 : ATSimplePermissions(cmd->subtype, rel,
5079 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5080 16082 : ATPrepAddPrimaryKey(wqueue, rel, cmd, recurse, lockmode, context);
5081 16052 : if (recurse)
5082 : {
5083 : /* recurses at exec time; lock descendants and set flag */
5084 15382 : (void) find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
5085 15382 : cmd->recurse = true;
5086 : }
5087 16052 : pass = AT_PASS_ADD_CONSTR;
5088 16052 : break;
5089 0 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5090 0 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE);
5091 : /* This command never recurses */
5092 : /* No command-specific prep needed */
5093 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5094 0 : break;
5095 798 : case AT_DropConstraint: /* DROP CONSTRAINT */
5096 798 : ATSimplePermissions(cmd->subtype, rel,
5097 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5098 798 : ATCheckPartitionsNotInUse(rel, lockmode);
5099 : /* Other recursion occurs during execution phase */
5100 : /* No command-specific prep needed except saving recurse flag */
5101 792 : if (recurse)
5102 756 : cmd->recurse = true;
5103 792 : pass = AT_PASS_DROP;
5104 792 : break;
5105 1288 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5106 1288 : ATSimplePermissions(cmd->subtype, rel,
5107 : ATT_TABLE | ATT_PARTITIONED_TABLE |
5108 : ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
5109 : /* See comments for ATPrepAlterColumnType */
5110 1288 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, recurse, lockmode,
5111 : AT_PASS_UNSET, context);
5112 : Assert(cmd != NULL);
5113 : /* Performs own recursion */
5114 1282 : ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd,
5115 : lockmode, context);
5116 1090 : pass = AT_PASS_ALTER_TYPE;
5117 1090 : break;
5118 172 : case AT_AlterColumnGenericOptions:
5119 172 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5120 : /* This command never recurses */
5121 : /* No command-specific prep needed */
5122 172 : pass = AT_PASS_MISC;
5123 172 : break;
5124 3574 : case AT_ChangeOwner: /* ALTER OWNER */
5125 : /* This command never recurses */
5126 : /* No command-specific prep needed */
5127 3574 : pass = AT_PASS_MISC;
5128 3574 : break;
5129 64 : case AT_ClusterOn: /* CLUSTER ON */
5130 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5131 64 : ATSimplePermissions(cmd->subtype, rel,
5132 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5133 : /* These commands never recurse */
5134 : /* No command-specific prep needed */
5135 64 : pass = AT_PASS_MISC;
5136 64 : break;
5137 112 : case AT_SetLogged: /* SET LOGGED */
5138 : case AT_SetUnLogged: /* SET UNLOGGED */
5139 112 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_SEQUENCE);
5140 100 : if (tab->chgPersistence)
5141 0 : ereport(ERROR,
5142 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5143 : errmsg("cannot change persistence setting twice")));
5144 100 : ATPrepChangePersistence(tab, rel, cmd->subtype == AT_SetLogged);
5145 88 : pass = AT_PASS_MISC;
5146 88 : break;
5147 6 : case AT_DropOids: /* SET WITHOUT OIDS */
5148 6 : ATSimplePermissions(cmd->subtype, rel,
5149 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5150 6 : pass = AT_PASS_DROP;
5151 6 : break;
5152 128 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5153 128 : ATSimplePermissions(cmd->subtype, rel,
5154 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5155 :
5156 : /* check if another access method change was already requested */
5157 128 : if (tab->chgAccessMethod)
5158 18 : ereport(ERROR,
5159 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5160 : errmsg("cannot have multiple SET ACCESS METHOD subcommands")));
5161 :
5162 110 : ATPrepSetAccessMethod(tab, rel, cmd->name);
5163 110 : pass = AT_PASS_MISC; /* does not matter; no work in Phase 2 */
5164 110 : break;
5165 158 : case AT_SetTableSpace: /* SET TABLESPACE */
5166 158 : ATSimplePermissions(cmd->subtype, rel, ATT_TABLE | ATT_PARTITIONED_TABLE |
5167 : ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX);
5168 : /* This command never recurses */
5169 158 : ATPrepSetTableSpace(tab, rel, cmd->name, lockmode);
5170 158 : pass = AT_PASS_MISC; /* doesn't actually matter */
5171 158 : break;
5172 960 : case AT_SetRelOptions: /* SET (...) */
5173 : case AT_ResetRelOptions: /* RESET (...) */
5174 : case AT_ReplaceRelOptions: /* reset them all, then set just these */
5175 960 : ATSimplePermissions(cmd->subtype, rel,
5176 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_VIEW |
5177 : ATT_MATVIEW | ATT_INDEX);
5178 : /* This command never recurses */
5179 : /* No command-specific prep needed */
5180 958 : pass = AT_PASS_MISC;
5181 958 : break;
5182 444 : case AT_AddInherit: /* INHERIT */
5183 444 : ATSimplePermissions(cmd->subtype, rel,
5184 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5185 : /* This command never recurses */
5186 444 : ATPrepAddInherit(rel);
5187 426 : pass = AT_PASS_MISC;
5188 426 : break;
5189 86 : case AT_DropInherit: /* NO INHERIT */
5190 86 : ATSimplePermissions(cmd->subtype, rel,
5191 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5192 : /* This command never recurses */
5193 : /* No command-specific prep needed */
5194 86 : pass = AT_PASS_MISC;
5195 86 : break;
5196 288 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5197 288 : ATSimplePermissions(cmd->subtype, rel,
5198 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5199 : /* Recursion occurs during execution phase */
5200 282 : if (recurse)
5201 282 : cmd->recurse = true;
5202 282 : pass = AT_PASS_MISC;
5203 282 : break;
5204 464 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5205 464 : ATSimplePermissions(cmd->subtype, rel,
5206 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5207 : /* Recursion occurs during execution phase */
5208 : /* No command-specific prep needed except saving recurse flag */
5209 464 : if (recurse)
5210 464 : cmd->recurse = true;
5211 464 : pass = AT_PASS_MISC;
5212 464 : break;
5213 490 : case AT_ReplicaIdentity: /* REPLICA IDENTITY ... */
5214 490 : ATSimplePermissions(cmd->subtype, rel,
5215 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_MATVIEW);
5216 490 : pass = AT_PASS_MISC;
5217 : /* This command never recurses */
5218 : /* No command-specific prep needed */
5219 490 : break;
5220 346 : case AT_EnableTrig: /* ENABLE TRIGGER variants */
5221 : case AT_EnableAlwaysTrig:
5222 : case AT_EnableReplicaTrig:
5223 : case AT_EnableTrigAll:
5224 : case AT_EnableTrigUser:
5225 : case AT_DisableTrig: /* DISABLE TRIGGER variants */
5226 : case AT_DisableTrigAll:
5227 : case AT_DisableTrigUser:
5228 346 : ATSimplePermissions(cmd->subtype, rel,
5229 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
5230 : /* Set up recursion for phase 2; no other prep needed */
5231 346 : if (recurse)
5232 318 : cmd->recurse = true;
5233 346 : pass = AT_PASS_MISC;
5234 346 : break;
5235 564 : case AT_EnableRule: /* ENABLE/DISABLE RULE variants */
5236 : case AT_EnableAlwaysRule:
5237 : case AT_EnableReplicaRule:
5238 : case AT_DisableRule:
5239 : case AT_AddOf: /* OF */
5240 : case AT_DropOf: /* NOT OF */
5241 : case AT_EnableRowSecurity:
5242 : case AT_DisableRowSecurity:
5243 : case AT_ForceRowSecurity:
5244 : case AT_NoForceRowSecurity:
5245 564 : ATSimplePermissions(cmd->subtype, rel,
5246 : ATT_TABLE | ATT_PARTITIONED_TABLE);
5247 : /* These commands never recurse */
5248 : /* No command-specific prep needed */
5249 564 : pass = AT_PASS_MISC;
5250 564 : break;
5251 58 : case AT_GenericOptions:
5252 58 : ATSimplePermissions(cmd->subtype, rel, ATT_FOREIGN_TABLE);
5253 : /* No command-specific prep needed */
5254 58 : pass = AT_PASS_MISC;
5255 58 : break;
5256 3314 : case AT_AttachPartition:
5257 3314 : ATSimplePermissions(cmd->subtype, rel,
5258 : ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
5259 : /* No command-specific prep needed */
5260 3308 : pass = AT_PASS_MISC;
5261 3308 : break;
5262 588 : case AT_DetachPartition:
5263 588 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5264 : /* No command-specific prep needed */
5265 570 : pass = AT_PASS_MISC;
5266 570 : break;
5267 20 : case AT_DetachPartitionFinalize:
5268 20 : ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
5269 : /* No command-specific prep needed */
5270 14 : pass = AT_PASS_MISC;
5271 14 : break;
5272 0 : default: /* oops */
5273 0 : elog(ERROR, "unrecognized alter table type: %d",
5274 : (int) cmd->subtype);
5275 : pass = AT_PASS_UNSET; /* keep compiler quiet */
5276 : break;
5277 : }
5278 : Assert(pass > AT_PASS_UNSET);
5279 :
5280 : /* Add the subcommand to the appropriate list for phase 2 */
5281 35988 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd);
5282 35988 : }
5283 :
5284 : /*
5285 : * ATRewriteCatalogs
5286 : *
5287 : * Traffic cop for ALTER TABLE Phase 2 operations. Subcommands are
5288 : * dispatched in a "safe" execution order (designed to avoid unnecessary
5289 : * conflicts).
5290 : */
5291 : static void
5292 33894 : ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
5293 : AlterTableUtilityContext *context)
5294 : {
5295 : ListCell *ltab;
5296 :
5297 : /*
5298 : * We process all the tables "in parallel", one pass at a time. This is
5299 : * needed because we may have to propagate work from one table to another
5300 : * (specifically, ALTER TYPE on a foreign key's PK has to dispatch the
5301 : * re-adding of the foreign key constraint to the other table). Work can
5302 : * only be propagated into later passes, however.
5303 : */
5304 428086 : for (AlterTablePass pass = 0; pass < AT_NUM_PASSES; pass++)
5305 : {
5306 : /* Go through each table that needs to be processed */
5307 807422 : foreach(ltab, *wqueue)
5308 : {
5309 413230 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5310 413230 : List *subcmds = tab->subcmds[pass];
5311 : ListCell *lcmd;
5312 :
5313 413230 : if (subcmds == NIL)
5314 355882 : continue;
5315 :
5316 : /*
5317 : * Open the relation and store it in tab. This allows subroutines
5318 : * close and reopen, if necessary. Appropriate lock was obtained
5319 : * by phase 1, needn't get it again.
5320 : */
5321 57348 : tab->rel = relation_open(tab->relid, NoLock);
5322 :
5323 115498 : foreach(lcmd, subcmds)
5324 60966 : ATExecCmd(wqueue, tab,
5325 60966 : lfirst_node(AlterTableCmd, lcmd),
5326 : lockmode, pass, context);
5327 :
5328 : /*
5329 : * After the ALTER TYPE or SET EXPRESSION pass, do cleanup work
5330 : * (this is not done in ATExecAlterColumnType since it should be
5331 : * done only once if multiple columns of a table are altered).
5332 : */
5333 54532 : if (pass == AT_PASS_ALTER_TYPE || pass == AT_PASS_SET_EXPRESSION)
5334 1120 : ATPostAlterTypeCleanup(wqueue, tab, lockmode);
5335 :
5336 54532 : if (tab->rel)
5337 : {
5338 54532 : relation_close(tab->rel, NoLock);
5339 54532 : tab->rel = NULL;
5340 : }
5341 : }
5342 : }
5343 :
5344 : /* Check to see if a toast table must be added. */
5345 66750 : foreach(ltab, *wqueue)
5346 : {
5347 35672 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5348 :
5349 : /*
5350 : * If the table is source table of ATTACH PARTITION command, we did
5351 : * not modify anything about it that will change its toasting
5352 : * requirement, so no need to check.
5353 : */
5354 35672 : if (((tab->relkind == RELKIND_RELATION ||
5355 7000 : tab->relkind == RELKIND_PARTITIONED_TABLE) &&
5356 33482 : tab->partition_constraint == NULL) ||
5357 4610 : tab->relkind == RELKIND_MATVIEW)
5358 31130 : AlterTableCreateToastTable(tab->relid, (Datum) 0, lockmode);
5359 : }
5360 31078 : }
5361 :
5362 : /*
5363 : * ATExecCmd: dispatch a subcommand to appropriate execution routine
5364 : */
5365 : static void
5366 60966 : ATExecCmd(List **wqueue, AlteredTableInfo *tab,
5367 : AlterTableCmd *cmd, LOCKMODE lockmode, AlterTablePass cur_pass,
5368 : AlterTableUtilityContext *context)
5369 : {
5370 60966 : ObjectAddress address = InvalidObjectAddress;
5371 60966 : Relation rel = tab->rel;
5372 :
5373 60966 : switch (cmd->subtype)
5374 : {
5375 2164 : case AT_AddColumn: /* ADD COLUMN */
5376 : case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
5377 2164 : address = ATExecAddColumn(wqueue, tab, rel, &cmd,
5378 2164 : cmd->recurse, false,
5379 : lockmode, cur_pass, context);
5380 2032 : break;
5381 612 : case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
5382 612 : address = ATExecColumnDefault(rel, cmd->name, cmd->def, lockmode);
5383 546 : break;
5384 80 : case AT_CookedColumnDefault: /* add a pre-cooked default */
5385 80 : address = ATExecCookedColumnDefault(rel, cmd->num, cmd->def);
5386 80 : break;
5387 210 : case AT_AddIdentity:
5388 210 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5389 : cur_pass, context);
5390 : Assert(cmd != NULL);
5391 198 : address = ATExecAddIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5392 150 : break;
5393 62 : case AT_SetIdentity:
5394 62 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5395 : cur_pass, context);
5396 : Assert(cmd != NULL);
5397 62 : address = ATExecSetIdentity(rel, cmd->name, cmd->def, lockmode, cmd->recurse, false);
5398 38 : break;
5399 56 : case AT_DropIdentity:
5400 56 : address = ATExecDropIdentity(rel, cmd->name, cmd->missing_ok, lockmode, cmd->recurse, false);
5401 38 : break;
5402 268 : case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
5403 268 : address = ATExecDropNotNull(rel, cmd->name, cmd->recurse, lockmode);
5404 166 : break;
5405 408 : case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
5406 408 : address = ATExecSetNotNull(wqueue, rel, NULL, cmd->name,
5407 408 : cmd->recurse, false, lockmode);
5408 378 : break;
5409 180 : case AT_SetExpression:
5410 180 : address = ATExecSetExpression(tab, rel, cmd->name, cmd->def, lockmode);
5411 150 : break;
5412 56 : case AT_DropExpression:
5413 56 : address = ATExecDropExpression(rel, cmd->name, cmd->missing_ok, lockmode);
5414 32 : break;
5415 164 : case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
5416 164 : address = ATExecSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
5417 116 : break;
5418 26 : case AT_SetOptions: /* ALTER COLUMN SET ( options ) */
5419 26 : address = ATExecSetOptions(rel, cmd->name, cmd->def, false, lockmode);
5420 26 : break;
5421 6 : case AT_ResetOptions: /* ALTER COLUMN RESET ( options ) */
5422 6 : address = ATExecSetOptions(rel, cmd->name, cmd->def, true, lockmode);
5423 6 : break;
5424 246 : case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
5425 246 : address = ATExecSetStorage(rel, cmd->name, cmd->def, lockmode);
5426 234 : break;
5427 90 : case AT_SetCompression: /* ALTER COLUMN SET COMPRESSION */
5428 90 : address = ATExecSetCompression(rel, cmd->name, cmd->def,
5429 : lockmode);
5430 84 : break;
5431 1640 : case AT_DropColumn: /* DROP COLUMN */
5432 1640 : address = ATExecDropColumn(wqueue, rel, cmd->name,
5433 1640 : cmd->behavior, cmd->recurse, false,
5434 1640 : cmd->missing_ok, lockmode,
5435 : NULL);
5436 1460 : break;
5437 1454 : case AT_AddIndex: /* ADD INDEX */
5438 1454 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, false,
5439 : lockmode);
5440 1284 : break;
5441 444 : case AT_ReAddIndex: /* ADD INDEX */
5442 444 : address = ATExecAddIndex(tab, rel, (IndexStmt *) cmd->def, true,
5443 : lockmode);
5444 444 : break;
5445 14 : case AT_ReAddStatistics: /* ADD STATISTICS */
5446 14 : address = ATExecAddStatistics(tab, rel, (CreateStatsStmt *) cmd->def,
5447 : true, lockmode);
5448 14 : break;
5449 28346 : case AT_AddConstraint: /* ADD CONSTRAINT */
5450 : /* Transform the command only during initial examination */
5451 28346 : if (cur_pass == AT_PASS_ADD_CONSTR)
5452 16022 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd,
5453 16052 : cmd->recurse, lockmode,
5454 : cur_pass, context);
5455 : /* Depending on constraint type, might be no more work to do now */
5456 28316 : if (cmd != NULL)
5457 : address =
5458 12294 : ATExecAddConstraint(wqueue, tab, rel,
5459 12294 : (Constraint *) cmd->def,
5460 12294 : cmd->recurse, false, lockmode);
5461 27636 : break;
5462 326 : case AT_ReAddConstraint: /* Re-add pre-existing check constraint */
5463 : address =
5464 326 : ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
5465 : true, true, lockmode);
5466 314 : break;
5467 14 : case AT_ReAddDomainConstraint: /* Re-add pre-existing domain check
5468 : * constraint */
5469 : address =
5470 14 : AlterDomainAddConstraint(((AlterDomainStmt *) cmd->def)->typeName,
5471 14 : ((AlterDomainStmt *) cmd->def)->def,
5472 : NULL);
5473 8 : break;
5474 78 : case AT_ReAddComment: /* Re-add existing comment */
5475 78 : address = CommentObject((CommentStmt *) cmd->def);
5476 78 : break;
5477 10420 : case AT_AddIndexConstraint: /* ADD CONSTRAINT USING INDEX */
5478 10420 : address = ATExecAddIndexConstraint(tab, rel, (IndexStmt *) cmd->def,
5479 : lockmode);
5480 10408 : break;
5481 282 : case AT_AlterConstraint: /* ALTER CONSTRAINT */
5482 282 : address = ATExecAlterConstraint(wqueue, rel,
5483 282 : castNode(ATAlterConstraint, cmd->def),
5484 282 : cmd->recurse, lockmode);
5485 216 : break;
5486 464 : case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
5487 464 : address = ATExecValidateConstraint(wqueue, rel, cmd->name, cmd->recurse,
5488 : false, lockmode);
5489 458 : break;
5490 792 : case AT_DropConstraint: /* DROP CONSTRAINT */
5491 792 : ATExecDropConstraint(rel, cmd->name, cmd->behavior,
5492 792 : cmd->recurse,
5493 792 : cmd->missing_ok, lockmode);
5494 582 : break;
5495 1054 : case AT_AlterColumnType: /* ALTER COLUMN TYPE */
5496 : /* parse transformation was done earlier */
5497 1054 : address = ATExecAlterColumnType(tab, rel, cmd, lockmode);
5498 1012 : break;
5499 172 : case AT_AlterColumnGenericOptions: /* ALTER COLUMN OPTIONS */
5500 : address =
5501 172 : ATExecAlterColumnGenericOptions(rel, cmd->name,
5502 172 : (List *) cmd->def, lockmode);
5503 166 : break;
5504 3574 : case AT_ChangeOwner: /* ALTER OWNER */
5505 3568 : ATExecChangeOwner(RelationGetRelid(rel),
5506 3574 : get_rolespec_oid(cmd->newowner, false),
5507 : false, lockmode);
5508 3556 : break;
5509 64 : case AT_ClusterOn: /* CLUSTER ON */
5510 64 : address = ATExecClusterOn(rel, cmd->name, lockmode);
5511 58 : break;
5512 18 : case AT_DropCluster: /* SET WITHOUT CLUSTER */
5513 18 : ATExecDropCluster(rel, lockmode);
5514 12 : break;
5515 88 : case AT_SetLogged: /* SET LOGGED */
5516 : case AT_SetUnLogged: /* SET UNLOGGED */
5517 88 : break;
5518 6 : case AT_DropOids: /* SET WITHOUT OIDS */
5519 : /* nothing to do here, oid columns don't exist anymore */
5520 6 : break;
5521 92 : case AT_SetAccessMethod: /* SET ACCESS METHOD */
5522 :
5523 : /*
5524 : * Only do this for partitioned tables, for which this is just a
5525 : * catalog change. Tables with storage are handled by Phase 3.
5526 : */
5527 92 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
5528 50 : tab->chgAccessMethod)
5529 44 : ATExecSetAccessMethodNoStorage(rel, tab->newAccessMethod);
5530 92 : break;
5531 158 : case AT_SetTableSpace: /* SET TABLESPACE */
5532 :
5533 : /*
5534 : * Only do this for partitioned tables and indexes, for which this
5535 : * is just a catalog change. Other relation types which have
5536 : * storage are handled by Phase 3.
5537 : */
5538 158 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
5539 146 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
5540 36 : ATExecSetTableSpaceNoStorage(rel, tab->newTableSpace);
5541 :
5542 152 : break;
5543 958 : case AT_SetRelOptions: /* SET (...) */
5544 : case AT_ResetRelOptions: /* RESET (...) */
5545 : case AT_ReplaceRelOptions: /* replace entire option list */
5546 958 : ATExecSetRelOptions(rel, (List *) cmd->def, cmd->subtype, lockmode);
5547 906 : break;
5548 122 : case AT_EnableTrig: /* ENABLE TRIGGER name */
5549 122 : ATExecEnableDisableTrigger(rel, cmd->name,
5550 : TRIGGER_FIRES_ON_ORIGIN, false,
5551 122 : cmd->recurse,
5552 : lockmode);
5553 122 : break;
5554 44 : case AT_EnableAlwaysTrig: /* ENABLE ALWAYS TRIGGER name */
5555 44 : ATExecEnableDisableTrigger(rel, cmd->name,
5556 : TRIGGER_FIRES_ALWAYS, false,
5557 44 : cmd->recurse,
5558 : lockmode);
5559 44 : break;
5560 16 : case AT_EnableReplicaTrig: /* ENABLE REPLICA TRIGGER name */
5561 16 : ATExecEnableDisableTrigger(rel, cmd->name,
5562 : TRIGGER_FIRES_ON_REPLICA, false,
5563 16 : cmd->recurse,
5564 : lockmode);
5565 16 : break;
5566 140 : case AT_DisableTrig: /* DISABLE TRIGGER name */
5567 140 : ATExecEnableDisableTrigger(rel, cmd->name,
5568 : TRIGGER_DISABLED, false,
5569 140 : cmd->recurse,
5570 : lockmode);
5571 140 : break;
5572 0 : case AT_EnableTrigAll: /* ENABLE TRIGGER ALL */
5573 0 : ATExecEnableDisableTrigger(rel, NULL,
5574 : TRIGGER_FIRES_ON_ORIGIN, false,
5575 0 : cmd->recurse,
5576 : lockmode);
5577 0 : break;
5578 12 : case AT_DisableTrigAll: /* DISABLE TRIGGER ALL */
5579 12 : ATExecEnableDisableTrigger(rel, NULL,
5580 : TRIGGER_DISABLED, false,
5581 12 : cmd->recurse,
5582 : lockmode);
5583 12 : break;
5584 0 : case AT_EnableTrigUser: /* ENABLE TRIGGER USER */
5585 0 : ATExecEnableDisableTrigger(rel, NULL,
5586 : TRIGGER_FIRES_ON_ORIGIN, true,
5587 0 : cmd->recurse,
5588 : lockmode);
5589 0 : break;
5590 12 : case AT_DisableTrigUser: /* DISABLE TRIGGER USER */
5591 12 : ATExecEnableDisableTrigger(rel, NULL,
5592 : TRIGGER_DISABLED, true,
5593 12 : cmd->recurse,
5594 : lockmode);
5595 12 : break;
5596 :
5597 8 : case AT_EnableRule: /* ENABLE RULE name */
5598 8 : ATExecEnableDisableRule(rel, cmd->name,
5599 : RULE_FIRES_ON_ORIGIN, lockmode);
5600 8 : break;
5601 0 : case AT_EnableAlwaysRule: /* ENABLE ALWAYS RULE name */
5602 0 : ATExecEnableDisableRule(rel, cmd->name,
5603 : RULE_FIRES_ALWAYS, lockmode);
5604 0 : break;
5605 6 : case AT_EnableReplicaRule: /* ENABLE REPLICA RULE name */
5606 6 : ATExecEnableDisableRule(rel, cmd->name,
5607 : RULE_FIRES_ON_REPLICA, lockmode);
5608 6 : break;
5609 38 : case AT_DisableRule: /* DISABLE RULE name */
5610 38 : ATExecEnableDisableRule(rel, cmd->name,
5611 : RULE_DISABLED, lockmode);
5612 38 : break;
5613 :
5614 426 : case AT_AddInherit:
5615 426 : address = ATExecAddInherit(rel, (RangeVar *) cmd->def, lockmode);
5616 306 : break;
5617 86 : case AT_DropInherit:
5618 86 : address = ATExecDropInherit(rel, (RangeVar *) cmd->def, lockmode);
5619 80 : break;
5620 66 : case AT_AddOf:
5621 66 : address = ATExecAddOf(rel, (TypeName *) cmd->def, lockmode);
5622 30 : break;
5623 6 : case AT_DropOf:
5624 6 : ATExecDropOf(rel, lockmode);
5625 6 : break;
5626 508 : case AT_ReplicaIdentity:
5627 508 : ATExecReplicaIdentity(rel, (ReplicaIdentityStmt *) cmd->def, lockmode);
5628 460 : break;
5629 302 : case AT_EnableRowSecurity:
5630 302 : ATExecSetRowSecurity(rel, true);
5631 302 : break;
5632 10 : case AT_DisableRowSecurity:
5633 10 : ATExecSetRowSecurity(rel, false);
5634 10 : break;
5635 96 : case AT_ForceRowSecurity:
5636 96 : ATExecForceNoForceRowSecurity(rel, true);
5637 96 : break;
5638 32 : case AT_NoForceRowSecurity:
5639 32 : ATExecForceNoForceRowSecurity(rel, false);
5640 32 : break;
5641 58 : case AT_GenericOptions:
5642 58 : ATExecGenericOptions(rel, (List *) cmd->def);
5643 56 : break;
5644 3308 : case AT_AttachPartition:
5645 3308 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5646 : cur_pass, context);
5647 : Assert(cmd != NULL);
5648 3284 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
5649 2796 : address = ATExecAttachPartition(wqueue, rel, (PartitionCmd *) cmd->def,
5650 : context);
5651 : else
5652 488 : address = ATExecAttachPartitionIdx(wqueue, rel,
5653 488 : ((PartitionCmd *) cmd->def)->name);
5654 2894 : break;
5655 570 : case AT_DetachPartition:
5656 570 : cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
5657 : cur_pass, context);
5658 : Assert(cmd != NULL);
5659 : /* ATPrepCmd ensures it must be a table */
5660 : Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
5661 570 : address = ATExecDetachPartition(wqueue, tab, rel,
5662 570 : ((PartitionCmd *) cmd->def)->name,
5663 570 : ((PartitionCmd *) cmd->def)->concurrent);
5664 440 : break;
5665 14 : case AT_DetachPartitionFinalize:
5666 14 : address = ATExecDetachPartitionFinalize(rel, ((PartitionCmd *) cmd->def)->name);
5667 14 : break;
5668 0 : default: /* oops */
5669 0 : elog(ERROR, "unrecognized alter table type: %d",
5670 : (int) cmd->subtype);
5671 : break;
5672 : }
5673 :
5674 : /*
5675 : * Report the subcommand to interested event triggers.
5676 : */
5677 58150 : if (cmd)
5678 42128 : EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
5679 :
5680 : /*
5681 : * Bump the command counter to ensure the next subcommand in the sequence
5682 : * can see the changes so far
5683 : */
5684 58150 : CommandCounterIncrement();
5685 58150 : }
5686 :
5687 : /*
5688 : * ATParseTransformCmd: perform parse transformation for one subcommand
5689 : *
5690 : * Returns the transformed subcommand tree, if there is one, else NULL.
5691 : *
5692 : * The parser may hand back additional AlterTableCmd(s) and/or other
5693 : * utility statements, either before or after the original subcommand.
5694 : * Other AlterTableCmds are scheduled into the appropriate slot of the
5695 : * AlteredTableInfo (they had better be for later passes than the current one).
5696 : * Utility statements that are supposed to happen before the AlterTableCmd
5697 : * are executed immediately. Those that are supposed to happen afterwards
5698 : * are added to the tab->afterStmts list to be done at the very end.
5699 : */
5700 : static AlterTableCmd *
5701 23534 : ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
5702 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
5703 : AlterTablePass cur_pass, AlterTableUtilityContext *context)
5704 : {
5705 23534 : AlterTableCmd *newcmd = NULL;
5706 23534 : AlterTableStmt *atstmt = makeNode(AlterTableStmt);
5707 : List *beforeStmts;
5708 : List *afterStmts;
5709 : ListCell *lc;
5710 :
5711 : /* Gin up an AlterTableStmt with just this subcommand and this table */
5712 23534 : atstmt->relation =
5713 23534 : makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
5714 23534 : pstrdup(RelationGetRelationName(rel)),
5715 : -1);
5716 23534 : atstmt->relation->inh = recurse;
5717 23534 : atstmt->cmds = list_make1(cmd);
5718 23534 : atstmt->objtype = OBJECT_TABLE; /* needn't be picky here */
5719 23534 : atstmt->missing_ok = false;
5720 :
5721 : /* Transform the AlterTableStmt */
5722 23534 : atstmt = transformAlterTableStmt(RelationGetRelid(rel),
5723 : atstmt,
5724 : context->queryString,
5725 : &beforeStmts,
5726 : &afterStmts);
5727 :
5728 : /* Execute any statements that should happen before these subcommand(s) */
5729 24030 : foreach(lc, beforeStmts)
5730 : {
5731 574 : Node *stmt = (Node *) lfirst(lc);
5732 :
5733 574 : ProcessUtilityForAlterTable(stmt, context);
5734 562 : CommandCounterIncrement();
5735 : }
5736 :
5737 : /* Examine the transformed subcommands and schedule them appropriately */
5738 55094 : foreach(lc, atstmt->cmds)
5739 : {
5740 31638 : AlterTableCmd *cmd2 = lfirst_node(AlterTableCmd, lc);
5741 : AlterTablePass pass;
5742 :
5743 : /*
5744 : * This switch need only cover the subcommand types that can be added
5745 : * by parse_utilcmd.c; otherwise, we'll use the default strategy of
5746 : * executing the subcommand immediately, as a substitute for the
5747 : * original subcommand. (Note, however, that this does cause
5748 : * AT_AddConstraint subcommands to be rescheduled into later passes,
5749 : * which is important for index and foreign key constraints.)
5750 : *
5751 : * We assume we needn't do any phase-1 checks for added subcommands.
5752 : */
5753 31638 : switch (cmd2->subtype)
5754 : {
5755 1478 : case AT_AddIndex:
5756 1478 : pass = AT_PASS_ADD_INDEX;
5757 1478 : break;
5758 10420 : case AT_AddIndexConstraint:
5759 10420 : pass = AT_PASS_ADD_INDEXCONSTR;
5760 10420 : break;
5761 12306 : case AT_AddConstraint:
5762 : /* Recursion occurs during execution phase */
5763 12306 : if (recurse)
5764 12232 : cmd2->recurse = true;
5765 12306 : switch (castNode(Constraint, cmd2->def)->contype)
5766 : {
5767 8832 : case CONSTR_NOTNULL:
5768 8832 : pass = AT_PASS_COL_ATTRS;
5769 8832 : break;
5770 0 : case CONSTR_PRIMARY:
5771 : case CONSTR_UNIQUE:
5772 : case CONSTR_EXCLUSION:
5773 0 : pass = AT_PASS_ADD_INDEXCONSTR;
5774 0 : break;
5775 3474 : default:
5776 3474 : pass = AT_PASS_ADD_OTHERCONSTR;
5777 3474 : break;
5778 : }
5779 12306 : break;
5780 0 : case AT_AlterColumnGenericOptions:
5781 : /* This command never recurses */
5782 : /* No command-specific prep needed */
5783 0 : pass = AT_PASS_MISC;
5784 0 : break;
5785 7434 : default:
5786 7434 : pass = cur_pass;
5787 7434 : break;
5788 : }
5789 :
5790 31638 : if (pass < cur_pass)
5791 : {
5792 : /* Cannot schedule into a pass we already finished */
5793 0 : elog(ERROR, "ALTER TABLE scheduling failure: too late for pass %d",
5794 : pass);
5795 : }
5796 31638 : else if (pass > cur_pass)
5797 : {
5798 : /* OK, queue it up for later */
5799 24204 : tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd2);
5800 : }
5801 : else
5802 : {
5803 : /*
5804 : * We should see at most one subcommand for the current pass,
5805 : * which is the transformed version of the original subcommand.
5806 : */
5807 7434 : if (newcmd == NULL && cmd->subtype == cmd2->subtype)
5808 : {
5809 : /* Found the transformed version of our subcommand */
5810 7434 : newcmd = cmd2;
5811 : }
5812 : else
5813 0 : elog(ERROR, "ALTER TABLE scheduling failure: bogus item for pass %d",
5814 : pass);
5815 : }
5816 : }
5817 :
5818 : /* Queue up any after-statements to happen at the end */
5819 23456 : tab->afterStmts = list_concat(tab->afterStmts, afterStmts);
5820 :
5821 23456 : return newcmd;
5822 : }
5823 :
5824 : /*
5825 : * ATRewriteTables: ALTER TABLE phase 3
5826 : */
5827 : static void
5828 31078 : ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
5829 : AlterTableUtilityContext *context)
5830 : {
5831 : ListCell *ltab;
5832 :
5833 : /* Go through each table that needs to be checked or rewritten */
5834 66374 : foreach(ltab, *wqueue)
5835 : {
5836 35642 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
5837 :
5838 : /* Relations without storage may be ignored here */
5839 35642 : if (!RELKIND_HAS_STORAGE(tab->relkind))
5840 6612 : continue;
5841 :
5842 : /*
5843 : * If we change column data types, the operation has to be propagated
5844 : * to tables that use this table's rowtype as a column type.
5845 : * tab->newvals will also be non-NULL in the case where we're adding a
5846 : * column with a default. We choose to forbid that case as well,
5847 : * since composite types might eventually support defaults.
5848 : *
5849 : * (Eventually we'll probably need to check for composite type
5850 : * dependencies even when we're just scanning the table without a
5851 : * rewrite, but at the moment a composite type does not enforce any
5852 : * constraints, so it's not necessary/appropriate to enforce them just
5853 : * during ALTER.)
5854 : */
5855 29030 : if (tab->newvals != NIL || tab->rewrite > 0)
5856 : {
5857 : Relation rel;
5858 :
5859 1692 : rel = table_open(tab->relid, NoLock);
5860 1692 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
5861 1674 : table_close(rel, NoLock);
5862 : }
5863 :
5864 : /*
5865 : * We only need to rewrite the table if at least one column needs to
5866 : * be recomputed, or we are changing its persistence or access method.
5867 : *
5868 : * There are two reasons for requiring a rewrite when changing
5869 : * persistence: on one hand, we need to ensure that the buffers
5870 : * belonging to each of the two relations are marked with or without
5871 : * BM_PERMANENT properly. On the other hand, since rewriting creates
5872 : * and assigns a new relfilenumber, we automatically create or drop an
5873 : * init fork for the relation as appropriate.
5874 : */
5875 29012 : if (tab->rewrite > 0 && tab->relkind != RELKIND_SEQUENCE)
5876 928 : {
5877 : /* Build a temporary relation and copy data */
5878 : Relation OldHeap;
5879 : Oid OIDNewHeap;
5880 : Oid NewAccessMethod;
5881 : Oid NewTableSpace;
5882 : char persistence;
5883 :
5884 984 : OldHeap = table_open(tab->relid, NoLock);
5885 :
5886 : /*
5887 : * We don't support rewriting of system catalogs; there are too
5888 : * many corner cases and too little benefit. In particular this
5889 : * is certainly not going to work for mapped catalogs.
5890 : */
5891 984 : if (IsSystemRelation(OldHeap))
5892 0 : ereport(ERROR,
5893 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5894 : errmsg("cannot rewrite system relation \"%s\"",
5895 : RelationGetRelationName(OldHeap))));
5896 :
5897 984 : if (RelationIsUsedAsCatalogTable(OldHeap))
5898 2 : ereport(ERROR,
5899 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5900 : errmsg("cannot rewrite table \"%s\" used as a catalog table",
5901 : RelationGetRelationName(OldHeap))));
5902 :
5903 : /*
5904 : * Don't allow rewrite on temp tables of other backends ... their
5905 : * local buffer manager is not going to cope. (This is redundant
5906 : * with the check in CheckAlterTableIsSafe, but for safety we'll
5907 : * check here too.)
5908 : */
5909 982 : if (RELATION_IS_OTHER_TEMP(OldHeap))
5910 0 : ereport(ERROR,
5911 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5912 : errmsg("cannot rewrite temporary tables of other sessions")));
5913 :
5914 : /*
5915 : * Select destination tablespace (same as original unless user
5916 : * requested a change)
5917 : */
5918 982 : if (tab->newTableSpace)
5919 0 : NewTableSpace = tab->newTableSpace;
5920 : else
5921 982 : NewTableSpace = OldHeap->rd_rel->reltablespace;
5922 :
5923 : /*
5924 : * Select destination access method (same as original unless user
5925 : * requested a change)
5926 : */
5927 982 : if (tab->chgAccessMethod)
5928 36 : NewAccessMethod = tab->newAccessMethod;
5929 : else
5930 946 : NewAccessMethod = OldHeap->rd_rel->relam;
5931 :
5932 : /*
5933 : * Select persistence of transient table (same as original unless
5934 : * user requested a change)
5935 : */
5936 982 : persistence = tab->chgPersistence ?
5937 930 : tab->newrelpersistence : OldHeap->rd_rel->relpersistence;
5938 :
5939 982 : table_close(OldHeap, NoLock);
5940 :
5941 : /*
5942 : * Fire off an Event Trigger now, before actually rewriting the
5943 : * table.
5944 : *
5945 : * We don't support Event Trigger for nested commands anywhere,
5946 : * here included, and parsetree is given NULL when coming from
5947 : * AlterTableInternal.
5948 : *
5949 : * And fire it only once.
5950 : */
5951 982 : if (parsetree)
5952 982 : EventTriggerTableRewrite((Node *) parsetree,
5953 : tab->relid,
5954 : tab->rewrite);
5955 :
5956 : /*
5957 : * Create transient table that will receive the modified data.
5958 : *
5959 : * Ensure it is marked correctly as logged or unlogged. We have
5960 : * to do this here so that buffers for the new relfilenumber will
5961 : * have the right persistence set, and at the same time ensure
5962 : * that the original filenumbers's buffers will get read in with
5963 : * the correct setting (i.e. the original one). Otherwise a
5964 : * rollback after the rewrite would possibly result with buffers
5965 : * for the original filenumbers having the wrong persistence
5966 : * setting.
5967 : *
5968 : * NB: This relies on swap_relation_files() also swapping the
5969 : * persistence. That wouldn't work for pg_class, but that can't be
5970 : * unlogged anyway.
5971 : */
5972 976 : OIDNewHeap = make_new_heap(tab->relid, NewTableSpace, NewAccessMethod,
5973 : persistence, lockmode);
5974 :
5975 : /*
5976 : * Copy the heap data into the new table with the desired
5977 : * modifications, and test the current data within the table
5978 : * against new constraints generated by ALTER TABLE commands.
5979 : */
5980 976 : ATRewriteTable(tab, OIDNewHeap);
5981 :
5982 : /*
5983 : * Swap the physical files of the old and new heaps, then rebuild
5984 : * indexes and discard the old heap. We can use RecentXmin for
5985 : * the table's new relfrozenxid because we rewrote all the tuples
5986 : * in ATRewriteTable, so no older Xid remains in the table. Also,
5987 : * we never try to swap toast tables by content, since we have no
5988 : * interest in letting this code work on system catalogs.
5989 : */
5990 934 : finish_heap_swap(tab->relid, OIDNewHeap,
5991 : false, false, true,
5992 934 : !OidIsValid(tab->newTableSpace),
5993 : RecentXmin,
5994 : ReadNextMultiXactId(),
5995 : persistence);
5996 :
5997 928 : InvokeObjectPostAlterHook(RelationRelationId, tab->relid, 0);
5998 : }
5999 28028 : else if (tab->rewrite > 0 && tab->relkind == RELKIND_SEQUENCE)
6000 : {
6001 24 : if (tab->chgPersistence)
6002 24 : SequenceChangePersistence(tab->relid, tab->newrelpersistence);
6003 : }
6004 : else
6005 : {
6006 : /*
6007 : * If required, test the current data within the table against new
6008 : * constraints generated by ALTER TABLE commands, but don't
6009 : * rebuild data.
6010 : */
6011 28004 : if (tab->constraints != NIL || tab->verify_new_notnull ||
6012 25102 : tab->partition_constraint != NULL)
6013 5168 : ATRewriteTable(tab, InvalidOid);
6014 :
6015 : /*
6016 : * If we had SET TABLESPACE but no reason to reconstruct tuples,
6017 : * just do a block-by-block copy.
6018 : */
6019 27732 : if (tab->newTableSpace)
6020 122 : ATExecSetTableSpace(tab->relid, tab->newTableSpace, lockmode);
6021 : }
6022 :
6023 : /*
6024 : * Also change persistence of owned sequences, so that it matches the
6025 : * table persistence.
6026 : */
6027 28684 : if (tab->chgPersistence)
6028 : {
6029 76 : List *seqlist = getOwnedSequences(tab->relid);
6030 : ListCell *lc;
6031 :
6032 124 : foreach(lc, seqlist)
6033 : {
6034 48 : Oid seq_relid = lfirst_oid(lc);
6035 :
6036 48 : SequenceChangePersistence(seq_relid, tab->newrelpersistence);
6037 : }
6038 : }
6039 : }
6040 :
6041 : /*
6042 : * Foreign key constraints are checked in a final pass, since (a) it's
6043 : * generally best to examine each one separately, and (b) it's at least
6044 : * theoretically possible that we have changed both relations of the
6045 : * foreign key, and we'd better have finished both rewrites before we try
6046 : * to read the tables.
6047 : */
6048 65770 : foreach(ltab, *wqueue)
6049 : {
6050 35130 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6051 35130 : Relation rel = NULL;
6052 : ListCell *lcon;
6053 :
6054 : /* Relations without storage may be ignored here too */
6055 35130 : if (!RELKIND_HAS_STORAGE(tab->relkind))
6056 6508 : continue;
6057 :
6058 30456 : foreach(lcon, tab->constraints)
6059 : {
6060 1926 : NewConstraint *con = lfirst(lcon);
6061 :
6062 1926 : if (con->contype == CONSTR_FOREIGN)
6063 : {
6064 1212 : Constraint *fkconstraint = (Constraint *) con->qual;
6065 : Relation refrel;
6066 :
6067 1212 : if (rel == NULL)
6068 : {
6069 : /* Long since locked, no need for another */
6070 1194 : rel = table_open(tab->relid, NoLock);
6071 : }
6072 :
6073 1212 : refrel = table_open(con->refrelid, RowShareLock);
6074 :
6075 1212 : validateForeignKeyConstraint(fkconstraint->conname, rel, refrel,
6076 : con->refindid,
6077 : con->conid,
6078 1212 : con->conwithperiod);
6079 :
6080 : /*
6081 : * No need to mark the constraint row as validated, we did
6082 : * that when we inserted the row earlier.
6083 : */
6084 :
6085 1120 : table_close(refrel, NoLock);
6086 : }
6087 : }
6088 :
6089 28530 : if (rel)
6090 1102 : table_close(rel, NoLock);
6091 : }
6092 :
6093 : /* Finally, run any afterStmts that were queued up */
6094 65634 : foreach(ltab, *wqueue)
6095 : {
6096 34994 : AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
6097 : ListCell *lc;
6098 :
6099 35080 : foreach(lc, tab->afterStmts)
6100 : {
6101 86 : Node *stmt = (Node *) lfirst(lc);
6102 :
6103 86 : ProcessUtilityForAlterTable(stmt, context);
6104 86 : CommandCounterIncrement();
6105 : }
6106 : }
6107 30640 : }
6108 :
6109 : /*
6110 : * ATRewriteTable: scan or rewrite one table
6111 : *
6112 : * A rewrite is requested by passing a valid OIDNewHeap; in that case, caller
6113 : * must already hold AccessExclusiveLock on it.
6114 : */
6115 : static void
6116 6144 : ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
6117 : {
6118 : Relation oldrel;
6119 : Relation newrel;
6120 : TupleDesc oldTupDesc;
6121 : TupleDesc newTupDesc;
6122 6144 : bool needscan = false;
6123 : List *notnull_attrs;
6124 : List *notnull_virtual_attrs;
6125 : int i;
6126 : ListCell *l;
6127 : EState *estate;
6128 : CommandId mycid;
6129 : BulkInsertState bistate;
6130 : int ti_options;
6131 6144 : ExprState *partqualstate = NULL;
6132 :
6133 : /*
6134 : * Open the relation(s). We have surely already locked the existing
6135 : * table.
6136 : */
6137 6144 : oldrel = table_open(tab->relid, NoLock);
6138 6144 : oldTupDesc = tab->oldDesc;
6139 6144 : newTupDesc = RelationGetDescr(oldrel); /* includes all mods */
6140 :
6141 6144 : if (OidIsValid(OIDNewHeap))
6142 : {
6143 : Assert(CheckRelationOidLockedByMe(OIDNewHeap, AccessExclusiveLock,
6144 : false));
6145 976 : newrel = table_open(OIDNewHeap, NoLock);
6146 : }
6147 : else
6148 5168 : newrel = NULL;
6149 :
6150 : /*
6151 : * Prepare a BulkInsertState and options for table_tuple_insert. The FSM
6152 : * is empty, so don't bother using it.
6153 : */
6154 6144 : if (newrel)
6155 : {
6156 976 : mycid = GetCurrentCommandId(true);
6157 976 : bistate = GetBulkInsertState();
6158 976 : ti_options = TABLE_INSERT_SKIP_FSM;
6159 : }
6160 : else
6161 : {
6162 : /* keep compiler quiet about using these uninitialized */
6163 5168 : mycid = 0;
6164 5168 : bistate = NULL;
6165 5168 : ti_options = 0;
6166 : }
6167 :
6168 : /*
6169 : * Generate the constraint and default execution states
6170 : */
6171 :
6172 6144 : estate = CreateExecutorState();
6173 :
6174 : /* Build the needed expression execution states */
6175 8190 : foreach(l, tab->constraints)
6176 : {
6177 2046 : NewConstraint *con = lfirst(l);
6178 :
6179 2046 : switch (con->contype)
6180 : {
6181 828 : case CONSTR_CHECK:
6182 828 : needscan = true;
6183 828 : con->qualstate = ExecPrepareExpr((Expr *) expand_generated_columns_in_expr(con->qual, oldrel, 1), estate);
6184 828 : break;
6185 1218 : case CONSTR_FOREIGN:
6186 : /* Nothing to do here */
6187 1218 : break;
6188 0 : default:
6189 0 : elog(ERROR, "unrecognized constraint type: %d",
6190 : (int) con->contype);
6191 : }
6192 : }
6193 :
6194 : /* Build expression execution states for partition check quals */
6195 6144 : if (tab->partition_constraint)
6196 : {
6197 2414 : needscan = true;
6198 2414 : partqualstate = ExecPrepareExpr(tab->partition_constraint, estate);
6199 : }
6200 :
6201 7182 : foreach(l, tab->newvals)
6202 : {
6203 1038 : NewColumnValue *ex = lfirst(l);
6204 :
6205 : /* expr already planned */
6206 1038 : ex->exprstate = ExecInitExpr((Expr *) ex->expr, NULL);
6207 : }
6208 :
6209 6144 : notnull_attrs = notnull_virtual_attrs = NIL;
6210 6144 : if (newrel || tab->verify_new_notnull)
6211 : {
6212 : /*
6213 : * If we are rebuilding the tuples OR if we added any new but not
6214 : * verified not-null constraints, check all *valid* not-null
6215 : * constraints. This is a bit of overkill but it minimizes risk of
6216 : * bugs.
6217 : *
6218 : * notnull_attrs does *not* collect attribute numbers for valid
6219 : * not-null constraints over virtual generated columns; instead, they
6220 : * are collected in notnull_virtual_attrs for verification elsewhere.
6221 : */
6222 7466 : for (i = 0; i < newTupDesc->natts; i++)
6223 : {
6224 5458 : CompactAttribute *attr = TupleDescCompactAttr(newTupDesc, i);
6225 :
6226 5458 : if (attr->attnullability == ATTNULLABLE_VALID &&
6227 2106 : !attr->attisdropped)
6228 : {
6229 2106 : Form_pg_attribute wholeatt = TupleDescAttr(newTupDesc, i);
6230 :
6231 2106 : if (wholeatt->attgenerated != ATTRIBUTE_GENERATED_VIRTUAL)
6232 2016 : notnull_attrs = lappend_int(notnull_attrs, wholeatt->attnum);
6233 : else
6234 90 : notnull_virtual_attrs = lappend_int(notnull_virtual_attrs,
6235 90 : wholeatt->attnum);
6236 : }
6237 : }
6238 2008 : if (notnull_attrs || notnull_virtual_attrs)
6239 1544 : needscan = true;
6240 : }
6241 :
6242 6144 : if (newrel || needscan)
6243 : {
6244 : ExprContext *econtext;
6245 : TupleTableSlot *oldslot;
6246 : TupleTableSlot *newslot;
6247 : TableScanDesc scan;
6248 : MemoryContext oldCxt;
6249 5134 : List *dropped_attrs = NIL;
6250 : ListCell *lc;
6251 : Snapshot snapshot;
6252 5134 : ResultRelInfo *rInfo = NULL;
6253 :
6254 : /*
6255 : * When adding or changing a virtual generated column with a not-null
6256 : * constraint, we need to evaluate whether the generation expression
6257 : * is null. For that, we borrow ExecRelGenVirtualNotNull(). Here, we
6258 : * prepare a dummy ResultRelInfo.
6259 : */
6260 5134 : if (notnull_virtual_attrs != NIL)
6261 : {
6262 : MemoryContext oldcontext;
6263 :
6264 : Assert(newTupDesc->constr->has_generated_virtual);
6265 : Assert(newTupDesc->constr->has_not_null);
6266 60 : oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
6267 60 : rInfo = makeNode(ResultRelInfo);
6268 60 : InitResultRelInfo(rInfo,
6269 : oldrel,
6270 : 0, /* dummy rangetable index */
6271 : NULL,
6272 : estate->es_instrument);
6273 60 : MemoryContextSwitchTo(oldcontext);
6274 : }
6275 :
6276 5134 : if (newrel)
6277 976 : ereport(DEBUG1,
6278 : (errmsg_internal("rewriting table \"%s\"",
6279 : RelationGetRelationName(oldrel))));
6280 : else
6281 4158 : ereport(DEBUG1,
6282 : (errmsg_internal("verifying table \"%s\"",
6283 : RelationGetRelationName(oldrel))));
6284 :
6285 5134 : if (newrel)
6286 : {
6287 : /*
6288 : * All predicate locks on the tuples or pages are about to be made
6289 : * invalid, because we move tuples around. Promote them to
6290 : * relation locks.
6291 : */
6292 976 : TransferPredicateLocksToHeapRelation(oldrel);
6293 : }
6294 :
6295 5134 : econtext = GetPerTupleExprContext(estate);
6296 :
6297 : /*
6298 : * Create necessary tuple slots. When rewriting, two slots are needed,
6299 : * otherwise one suffices. In the case where one slot suffices, we
6300 : * need to use the new tuple descriptor, otherwise some constraints
6301 : * can't be evaluated. Note that even when the tuple layout is the
6302 : * same and no rewrite is required, the tupDescs might not be
6303 : * (consider ADD COLUMN without a default).
6304 : */
6305 5134 : if (tab->rewrite)
6306 : {
6307 : Assert(newrel != NULL);
6308 976 : oldslot = MakeSingleTupleTableSlot(oldTupDesc,
6309 : table_slot_callbacks(oldrel));
6310 976 : newslot = MakeSingleTupleTableSlot(newTupDesc,
6311 : table_slot_callbacks(newrel));
6312 :
6313 : /*
6314 : * Set all columns in the new slot to NULL initially, to ensure
6315 : * columns added as part of the rewrite are initialized to NULL.
6316 : * That is necessary as tab->newvals will not contain an
6317 : * expression for columns with a NULL default, e.g. when adding a
6318 : * column without a default together with a column with a default
6319 : * requiring an actual rewrite.
6320 : */
6321 976 : ExecStoreAllNullTuple(newslot);
6322 : }
6323 : else
6324 : {
6325 4158 : oldslot = MakeSingleTupleTableSlot(newTupDesc,
6326 : table_slot_callbacks(oldrel));
6327 4158 : newslot = NULL;
6328 : }
6329 :
6330 : /*
6331 : * Any attributes that are dropped according to the new tuple
6332 : * descriptor can be set to NULL. We precompute the list of dropped
6333 : * attributes to avoid needing to do so in the per-tuple loop.
6334 : */
6335 18072 : for (i = 0; i < newTupDesc->natts; i++)
6336 : {
6337 12938 : if (TupleDescAttr(newTupDesc, i)->attisdropped)
6338 790 : dropped_attrs = lappend_int(dropped_attrs, i);
6339 : }
6340 :
6341 : /*
6342 : * Scan through the rows, generating a new row if needed and then
6343 : * checking all the constraints.
6344 : */
6345 5134 : snapshot = RegisterSnapshot(GetLatestSnapshot());
6346 5134 : scan = table_beginscan(oldrel, snapshot, 0, NULL);
6347 :
6348 : /*
6349 : * Switch to per-tuple memory context and reset it for each tuple
6350 : * produced, so we don't leak memory.
6351 : */
6352 5134 : oldCxt = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
6353 :
6354 770028 : while (table_scan_getnextslot(scan, ForwardScanDirection, oldslot))
6355 : {
6356 : TupleTableSlot *insertslot;
6357 :
6358 765208 : if (tab->rewrite > 0)
6359 : {
6360 : /* Extract data from old tuple */
6361 99822 : slot_getallattrs(oldslot);
6362 99822 : ExecClearTuple(newslot);
6363 :
6364 : /* copy attributes */
6365 99822 : memcpy(newslot->tts_values, oldslot->tts_values,
6366 99822 : sizeof(Datum) * oldslot->tts_nvalid);
6367 99822 : memcpy(newslot->tts_isnull, oldslot->tts_isnull,
6368 99822 : sizeof(bool) * oldslot->tts_nvalid);
6369 :
6370 : /* Set dropped attributes to null in new tuple */
6371 99938 : foreach(lc, dropped_attrs)
6372 116 : newslot->tts_isnull[lfirst_int(lc)] = true;
6373 :
6374 : /*
6375 : * Constraints and GENERATED expressions might reference the
6376 : * tableoid column, so fill tts_tableOid with the desired
6377 : * value. (We must do this each time, because it gets
6378 : * overwritten with newrel's OID during storing.)
6379 : */
6380 99822 : newslot->tts_tableOid = RelationGetRelid(oldrel);
6381 :
6382 : /*
6383 : * Process supplied expressions to replace selected columns.
6384 : *
6385 : * First, evaluate expressions whose inputs come from the old
6386 : * tuple.
6387 : */
6388 99822 : econtext->ecxt_scantuple = oldslot;
6389 :
6390 205596 : foreach(l, tab->newvals)
6391 : {
6392 105786 : NewColumnValue *ex = lfirst(l);
6393 :
6394 105786 : if (ex->is_generated)
6395 312 : continue;
6396 :
6397 105474 : newslot->tts_values[ex->attnum - 1]
6398 105462 : = ExecEvalExpr(ex->exprstate,
6399 : econtext,
6400 105474 : &newslot->tts_isnull[ex->attnum - 1]);
6401 : }
6402 :
6403 99810 : ExecStoreVirtualTuple(newslot);
6404 :
6405 : /*
6406 : * Now, evaluate any expressions whose inputs come from the
6407 : * new tuple. We assume these columns won't reference each
6408 : * other, so that there's no ordering dependency.
6409 : */
6410 99810 : econtext->ecxt_scantuple = newslot;
6411 :
6412 205584 : foreach(l, tab->newvals)
6413 : {
6414 105774 : NewColumnValue *ex = lfirst(l);
6415 :
6416 105774 : if (!ex->is_generated)
6417 105462 : continue;
6418 :
6419 312 : newslot->tts_values[ex->attnum - 1]
6420 312 : = ExecEvalExpr(ex->exprstate,
6421 : econtext,
6422 312 : &newslot->tts_isnull[ex->attnum - 1]);
6423 : }
6424 :
6425 99810 : insertslot = newslot;
6426 : }
6427 : else
6428 : {
6429 : /*
6430 : * If there's no rewrite, old and new table are guaranteed to
6431 : * have the same AM, so we can just use the old slot to verify
6432 : * new constraints etc.
6433 : */
6434 665386 : insertslot = oldslot;
6435 : }
6436 :
6437 : /* Now check any constraints on the possibly-changed tuple */
6438 765196 : econtext->ecxt_scantuple = insertslot;
6439 :
6440 4106650 : foreach_int(attn, notnull_attrs)
6441 : {
6442 2576462 : if (slot_attisnull(insertslot, attn))
6443 : {
6444 102 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attn - 1);
6445 :
6446 102 : ereport(ERROR,
6447 : (errcode(ERRCODE_NOT_NULL_VIOLATION),
6448 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6449 : NameStr(attr->attname),
6450 : RelationGetRelationName(oldrel)),
6451 : errtablecol(oldrel, attn)));
6452 : }
6453 : }
6454 :
6455 765094 : if (notnull_virtual_attrs != NIL)
6456 : {
6457 : AttrNumber attnum;
6458 :
6459 84 : attnum = ExecRelGenVirtualNotNull(rInfo, insertslot,
6460 : estate,
6461 : notnull_virtual_attrs);
6462 84 : if (attnum != InvalidAttrNumber)
6463 : {
6464 30 : Form_pg_attribute attr = TupleDescAttr(newTupDesc, attnum - 1);
6465 :
6466 30 : ereport(ERROR,
6467 : errcode(ERRCODE_NOT_NULL_VIOLATION),
6468 : errmsg("column \"%s\" of relation \"%s\" contains null values",
6469 : NameStr(attr->attname),
6470 : RelationGetRelationName(oldrel)),
6471 : errtablecol(oldrel, attnum));
6472 : }
6473 : }
6474 :
6475 773222 : foreach(l, tab->constraints)
6476 : {
6477 8254 : NewConstraint *con = lfirst(l);
6478 :
6479 8254 : switch (con->contype)
6480 : {
6481 8148 : case CONSTR_CHECK:
6482 8148 : if (!ExecCheck(con->qualstate, econtext))
6483 96 : ereport(ERROR,
6484 : (errcode(ERRCODE_CHECK_VIOLATION),
6485 : errmsg("check constraint \"%s\" of relation \"%s\" is violated by some row",
6486 : con->name,
6487 : RelationGetRelationName(oldrel)),
6488 : errtableconstraint(oldrel, con->name)));
6489 8052 : break;
6490 106 : case CONSTR_NOTNULL:
6491 : case CONSTR_FOREIGN:
6492 : /* Nothing to do here */
6493 106 : break;
6494 0 : default:
6495 0 : elog(ERROR, "unrecognized constraint type: %d",
6496 : (int) con->contype);
6497 : }
6498 : }
6499 :
6500 764968 : if (partqualstate && !ExecCheck(partqualstate, econtext))
6501 : {
6502 74 : if (tab->validate_default)
6503 26 : ereport(ERROR,
6504 : (errcode(ERRCODE_CHECK_VIOLATION),
6505 : errmsg("updated partition constraint for default partition \"%s\" would be violated by some row",
6506 : RelationGetRelationName(oldrel)),
6507 : errtable(oldrel)));
6508 : else
6509 48 : ereport(ERROR,
6510 : (errcode(ERRCODE_CHECK_VIOLATION),
6511 : errmsg("partition constraint of relation \"%s\" is violated by some row",
6512 : RelationGetRelationName(oldrel)),
6513 : errtable(oldrel)));
6514 : }
6515 :
6516 : /* Write the tuple out to the new relation */
6517 764894 : if (newrel)
6518 99780 : table_tuple_insert(newrel, insertslot, mycid,
6519 : ti_options, bistate);
6520 :
6521 764894 : ResetExprContext(econtext);
6522 :
6523 764894 : CHECK_FOR_INTERRUPTS();
6524 : }
6525 :
6526 4820 : MemoryContextSwitchTo(oldCxt);
6527 4820 : table_endscan(scan);
6528 4820 : UnregisterSnapshot(snapshot);
6529 :
6530 4820 : ExecDropSingleTupleTableSlot(oldslot);
6531 4820 : if (newslot)
6532 934 : ExecDropSingleTupleTableSlot(newslot);
6533 : }
6534 :
6535 5830 : FreeExecutorState(estate);
6536 :
6537 5830 : table_close(oldrel, NoLock);
6538 5830 : if (newrel)
6539 : {
6540 934 : FreeBulkInsertState(bistate);
6541 :
6542 934 : table_finish_bulk_insert(newrel, ti_options);
6543 :
6544 934 : table_close(newrel, NoLock);
6545 : }
6546 5830 : }
6547 :
6548 : /*
6549 : * ATGetQueueEntry: find or create an entry in the ALTER TABLE work queue
6550 : */
6551 : static AlteredTableInfo *
6552 43952 : ATGetQueueEntry(List **wqueue, Relation rel)
6553 : {
6554 43952 : Oid relid = RelationGetRelid(rel);
6555 : AlteredTableInfo *tab;
6556 : ListCell *ltab;
6557 :
6558 54128 : foreach(ltab, *wqueue)
6559 : {
6560 15044 : tab = (AlteredTableInfo *) lfirst(ltab);
6561 15044 : if (tab->relid == relid)
6562 4868 : return tab;
6563 : }
6564 :
6565 : /*
6566 : * Not there, so add it. Note that we make a copy of the relation's
6567 : * existing descriptor before anything interesting can happen to it.
6568 : */
6569 39084 : tab = (AlteredTableInfo *) palloc0(sizeof(AlteredTableInfo));
6570 39084 : tab->relid = relid;
6571 39084 : tab->rel = NULL; /* set later */
6572 39084 : tab->relkind = rel->rd_rel->relkind;
6573 39084 : tab->oldDesc = CreateTupleDescCopyConstr(RelationGetDescr(rel));
6574 39084 : tab->newAccessMethod = InvalidOid;
6575 39084 : tab->chgAccessMethod = false;
6576 39084 : tab->newTableSpace = InvalidOid;
6577 39084 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
6578 39084 : tab->chgPersistence = false;
6579 :
6580 39084 : *wqueue = lappend(*wqueue, tab);
6581 :
6582 39084 : return tab;
6583 : }
6584 :
6585 : static const char *
6586 80 : alter_table_type_to_string(AlterTableType cmdtype)
6587 : {
6588 80 : switch (cmdtype)
6589 : {
6590 0 : case AT_AddColumn:
6591 : case AT_AddColumnToView:
6592 0 : return "ADD COLUMN";
6593 0 : case AT_ColumnDefault:
6594 : case AT_CookedColumnDefault:
6595 0 : return "ALTER COLUMN ... SET DEFAULT";
6596 6 : case AT_DropNotNull:
6597 6 : return "ALTER COLUMN ... DROP NOT NULL";
6598 6 : case AT_SetNotNull:
6599 6 : return "ALTER COLUMN ... SET NOT NULL";
6600 0 : case AT_SetExpression:
6601 0 : return "ALTER COLUMN ... SET EXPRESSION";
6602 0 : case AT_DropExpression:
6603 0 : return "ALTER COLUMN ... DROP EXPRESSION";
6604 0 : case AT_SetStatistics:
6605 0 : return "ALTER COLUMN ... SET STATISTICS";
6606 12 : case AT_SetOptions:
6607 12 : return "ALTER COLUMN ... SET";
6608 0 : case AT_ResetOptions:
6609 0 : return "ALTER COLUMN ... RESET";
6610 0 : case AT_SetStorage:
6611 0 : return "ALTER COLUMN ... SET STORAGE";
6612 0 : case AT_SetCompression:
6613 0 : return "ALTER COLUMN ... SET COMPRESSION";
6614 6 : case AT_DropColumn:
6615 6 : return "DROP COLUMN";
6616 0 : case AT_AddIndex:
6617 : case AT_ReAddIndex:
6618 0 : return NULL; /* not real grammar */
6619 0 : case AT_AddConstraint:
6620 : case AT_ReAddConstraint:
6621 : case AT_ReAddDomainConstraint:
6622 : case AT_AddIndexConstraint:
6623 0 : return "ADD CONSTRAINT";
6624 6 : case AT_AlterConstraint:
6625 6 : return "ALTER CONSTRAINT";
6626 0 : case AT_ValidateConstraint:
6627 0 : return "VALIDATE CONSTRAINT";
6628 0 : case AT_DropConstraint:
6629 0 : return "DROP CONSTRAINT";
6630 0 : case AT_ReAddComment:
6631 0 : return NULL; /* not real grammar */
6632 0 : case AT_AlterColumnType:
6633 0 : return "ALTER COLUMN ... SET DATA TYPE";
6634 0 : case AT_AlterColumnGenericOptions:
6635 0 : return "ALTER COLUMN ... OPTIONS";
6636 0 : case AT_ChangeOwner:
6637 0 : return "OWNER TO";
6638 0 : case AT_ClusterOn:
6639 0 : return "CLUSTER ON";
6640 0 : case AT_DropCluster:
6641 0 : return "SET WITHOUT CLUSTER";
6642 0 : case AT_SetAccessMethod:
6643 0 : return "SET ACCESS METHOD";
6644 6 : case AT_SetLogged:
6645 6 : return "SET LOGGED";
6646 6 : case AT_SetUnLogged:
6647 6 : return "SET UNLOGGED";
6648 0 : case AT_DropOids:
6649 0 : return "SET WITHOUT OIDS";
6650 0 : case AT_SetTableSpace:
6651 0 : return "SET TABLESPACE";
6652 2 : case AT_SetRelOptions:
6653 2 : return "SET";
6654 0 : case AT_ResetRelOptions:
6655 0 : return "RESET";
6656 0 : case AT_ReplaceRelOptions:
6657 0 : return NULL; /* not real grammar */
6658 0 : case AT_EnableTrig:
6659 0 : return "ENABLE TRIGGER";
6660 0 : case AT_EnableAlwaysTrig:
6661 0 : return "ENABLE ALWAYS TRIGGER";
6662 0 : case AT_EnableReplicaTrig:
6663 0 : return "ENABLE REPLICA TRIGGER";
6664 0 : case AT_DisableTrig:
6665 0 : return "DISABLE TRIGGER";
6666 0 : case AT_EnableTrigAll:
6667 0 : return "ENABLE TRIGGER ALL";
6668 0 : case AT_DisableTrigAll:
6669 0 : return "DISABLE TRIGGER ALL";
6670 0 : case AT_EnableTrigUser:
6671 0 : return "ENABLE TRIGGER USER";
6672 0 : case AT_DisableTrigUser:
6673 0 : return "DISABLE TRIGGER USER";
6674 0 : case AT_EnableRule:
6675 0 : return "ENABLE RULE";
6676 0 : case AT_EnableAlwaysRule:
6677 0 : return "ENABLE ALWAYS RULE";
6678 0 : case AT_EnableReplicaRule:
6679 0 : return "ENABLE REPLICA RULE";
6680 0 : case AT_DisableRule:
6681 0 : return "DISABLE RULE";
6682 0 : case AT_AddInherit:
6683 0 : return "INHERIT";
6684 0 : case AT_DropInherit:
6685 0 : return "NO INHERIT";
6686 0 : case AT_AddOf:
6687 0 : return "OF";
6688 0 : case AT_DropOf:
6689 0 : return "NOT OF";
6690 0 : case AT_ReplicaIdentity:
6691 0 : return "REPLICA IDENTITY";
6692 0 : case AT_EnableRowSecurity:
6693 0 : return "ENABLE ROW SECURITY";
6694 0 : case AT_DisableRowSecurity:
6695 0 : return "DISABLE ROW SECURITY";
6696 0 : case AT_ForceRowSecurity:
6697 0 : return "FORCE ROW SECURITY";
6698 0 : case AT_NoForceRowSecurity:
6699 0 : return "NO FORCE ROW SECURITY";
6700 0 : case AT_GenericOptions:
6701 0 : return "OPTIONS";
6702 6 : case AT_AttachPartition:
6703 6 : return "ATTACH PARTITION";
6704 18 : case AT_DetachPartition:
6705 18 : return "DETACH PARTITION";
6706 6 : case AT_DetachPartitionFinalize:
6707 6 : return "DETACH PARTITION ... FINALIZE";
6708 0 : case AT_AddIdentity:
6709 0 : return "ALTER COLUMN ... ADD IDENTITY";
6710 0 : case AT_SetIdentity:
6711 0 : return "ALTER COLUMN ... SET";
6712 0 : case AT_DropIdentity:
6713 0 : return "ALTER COLUMN ... DROP IDENTITY";
6714 0 : case AT_ReAddStatistics:
6715 0 : return NULL; /* not real grammar */
6716 : }
6717 :
6718 0 : return NULL;
6719 : }
6720 :
6721 : /*
6722 : * ATSimplePermissions
6723 : *
6724 : * - Ensure that it is a relation (or possibly a view)
6725 : * - Ensure this user is the owner
6726 : * - Ensure that it is not a system table
6727 : */
6728 : static void
6729 38660 : ATSimplePermissions(AlterTableType cmdtype, Relation rel, int allowed_targets)
6730 : {
6731 : int actual_target;
6732 :
6733 38660 : switch (rel->rd_rel->relkind)
6734 : {
6735 30170 : case RELKIND_RELATION:
6736 30170 : actual_target = ATT_TABLE;
6737 30170 : break;
6738 6110 : case RELKIND_PARTITIONED_TABLE:
6739 6110 : actual_target = ATT_PARTITIONED_TABLE;
6740 6110 : break;
6741 406 : case RELKIND_VIEW:
6742 406 : actual_target = ATT_VIEW;
6743 406 : break;
6744 48 : case RELKIND_MATVIEW:
6745 48 : actual_target = ATT_MATVIEW;
6746 48 : break;
6747 228 : case RELKIND_INDEX:
6748 228 : actual_target = ATT_INDEX;
6749 228 : break;
6750 530 : case RELKIND_PARTITIONED_INDEX:
6751 530 : actual_target = ATT_PARTITIONED_INDEX;
6752 530 : break;
6753 216 : case RELKIND_COMPOSITE_TYPE:
6754 216 : actual_target = ATT_COMPOSITE_TYPE;
6755 216 : break;
6756 926 : case RELKIND_FOREIGN_TABLE:
6757 926 : actual_target = ATT_FOREIGN_TABLE;
6758 926 : break;
6759 24 : case RELKIND_SEQUENCE:
6760 24 : actual_target = ATT_SEQUENCE;
6761 24 : break;
6762 2 : default:
6763 2 : actual_target = 0;
6764 2 : break;
6765 : }
6766 :
6767 : /* Wrong target type? */
6768 38660 : if ((actual_target & allowed_targets) == 0)
6769 : {
6770 80 : const char *action_str = alter_table_type_to_string(cmdtype);
6771 :
6772 80 : if (action_str)
6773 80 : ereport(ERROR,
6774 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
6775 : /* translator: %s is a group of some SQL keywords */
6776 : errmsg("ALTER action %s cannot be performed on relation \"%s\"",
6777 : action_str, RelationGetRelationName(rel)),
6778 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
6779 : else
6780 : /* internal error? */
6781 0 : elog(ERROR, "invalid ALTER action attempted on relation \"%s\"",
6782 : RelationGetRelationName(rel));
6783 : }
6784 :
6785 : /* Permissions checks */
6786 38580 : if (!object_ownercheck(RelationRelationId, RelationGetRelid(rel), GetUserId()))
6787 12 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(rel->rd_rel->relkind),
6788 12 : RelationGetRelationName(rel));
6789 :
6790 38568 : if (!allowSystemTableMods && IsSystemRelation(rel))
6791 0 : ereport(ERROR,
6792 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6793 : errmsg("permission denied: \"%s\" is a system catalog",
6794 : RelationGetRelationName(rel))));
6795 38568 : }
6796 :
6797 : /*
6798 : * ATSimpleRecursion
6799 : *
6800 : * Simple table recursion sufficient for most ALTER TABLE operations.
6801 : * All direct and indirect children are processed in an unspecified order.
6802 : * Note that if a child inherits from the original table via multiple
6803 : * inheritance paths, it will be visited just once.
6804 : */
6805 : static void
6806 1324 : ATSimpleRecursion(List **wqueue, Relation rel,
6807 : AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
6808 : AlterTableUtilityContext *context)
6809 : {
6810 : /*
6811 : * Propagate to children, if desired and if there are (or might be) any
6812 : * children.
6813 : */
6814 1324 : if (recurse && rel->rd_rel->relhassubclass)
6815 : {
6816 84 : Oid relid = RelationGetRelid(rel);
6817 : ListCell *child;
6818 : List *children;
6819 :
6820 84 : children = find_all_inheritors(relid, lockmode, NULL);
6821 :
6822 : /*
6823 : * find_all_inheritors does the recursive search of the inheritance
6824 : * hierarchy, so all we have to do is process all of the relids in the
6825 : * list that it returns.
6826 : */
6827 366 : foreach(child, children)
6828 : {
6829 282 : Oid childrelid = lfirst_oid(child);
6830 : Relation childrel;
6831 :
6832 282 : if (childrelid == relid)
6833 84 : continue;
6834 : /* find_all_inheritors already got lock */
6835 198 : childrel = relation_open(childrelid, NoLock);
6836 198 : CheckAlterTableIsSafe(childrel);
6837 198 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
6838 198 : relation_close(childrel, NoLock);
6839 : }
6840 : }
6841 1324 : }
6842 :
6843 : /*
6844 : * Obtain list of partitions of the given table, locking them all at the given
6845 : * lockmode and ensuring that they all pass CheckAlterTableIsSafe.
6846 : *
6847 : * This function is a no-op if the given relation is not a partitioned table;
6848 : * in particular, nothing is done if it's a legacy inheritance parent.
6849 : */
6850 : static void
6851 798 : ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode)
6852 : {
6853 798 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6854 : {
6855 : List *inh;
6856 : ListCell *cell;
6857 :
6858 176 : inh = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
6859 : /* first element is the parent rel; must ignore it */
6860 574 : for_each_from(cell, inh, 1)
6861 : {
6862 : Relation childrel;
6863 :
6864 : /* find_all_inheritors already got lock */
6865 404 : childrel = table_open(lfirst_oid(cell), NoLock);
6866 404 : CheckAlterTableIsSafe(childrel);
6867 398 : table_close(childrel, NoLock);
6868 : }
6869 170 : list_free(inh);
6870 : }
6871 792 : }
6872 :
6873 : /*
6874 : * ATTypedTableRecursion
6875 : *
6876 : * Propagate ALTER TYPE operations to the typed tables of that type.
6877 : * Also check the RESTRICT/CASCADE behavior. Given CASCADE, also permit
6878 : * recursion to inheritance children of the typed tables.
6879 : */
6880 : static void
6881 192 : ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
6882 : LOCKMODE lockmode, AlterTableUtilityContext *context)
6883 : {
6884 : ListCell *child;
6885 : List *children;
6886 :
6887 : Assert(rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
6888 :
6889 192 : children = find_typed_table_dependencies(rel->rd_rel->reltype,
6890 192 : RelationGetRelationName(rel),
6891 : cmd->behavior);
6892 :
6893 204 : foreach(child, children)
6894 : {
6895 30 : Oid childrelid = lfirst_oid(child);
6896 : Relation childrel;
6897 :
6898 30 : childrel = relation_open(childrelid, lockmode);
6899 30 : CheckAlterTableIsSafe(childrel);
6900 30 : ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode, context);
6901 30 : relation_close(childrel, NoLock);
6902 : }
6903 174 : }
6904 :
6905 :
6906 : /*
6907 : * find_composite_type_dependencies
6908 : *
6909 : * Check to see if the type "typeOid" is being used as a column in some table
6910 : * (possibly nested several levels deep in composite types, arrays, etc!).
6911 : * Eventually, we'd like to propagate the check or rewrite operation
6912 : * into such tables, but for now, just error out if we find any.
6913 : *
6914 : * Caller should provide either the associated relation of a rowtype,
6915 : * or a type name (not both) for use in the error message, if any.
6916 : *
6917 : * Note that "typeOid" is not necessarily a composite type; it could also be
6918 : * another container type such as an array or range, or a domain over one of
6919 : * these things. The name of this function is therefore somewhat historical,
6920 : * but it's not worth changing.
6921 : *
6922 : * We assume that functions and views depending on the type are not reasons
6923 : * to reject the ALTER. (How safe is this really?)
6924 : */
6925 : void
6926 4440 : find_composite_type_dependencies(Oid typeOid, Relation origRelation,
6927 : const char *origTypeName)
6928 : {
6929 : Relation depRel;
6930 : ScanKeyData key[2];
6931 : SysScanDesc depScan;
6932 : HeapTuple depTup;
6933 :
6934 : /* since this function recurses, it could be driven to stack overflow */
6935 4440 : check_stack_depth();
6936 :
6937 : /*
6938 : * We scan pg_depend to find those things that depend on the given type.
6939 : * (We assume we can ignore refobjsubid for a type.)
6940 : */
6941 4440 : depRel = table_open(DependRelationId, AccessShareLock);
6942 :
6943 4440 : ScanKeyInit(&key[0],
6944 : Anum_pg_depend_refclassid,
6945 : BTEqualStrategyNumber, F_OIDEQ,
6946 : ObjectIdGetDatum(TypeRelationId));
6947 4440 : ScanKeyInit(&key[1],
6948 : Anum_pg_depend_refobjid,
6949 : BTEqualStrategyNumber, F_OIDEQ,
6950 : ObjectIdGetDatum(typeOid));
6951 :
6952 4440 : depScan = systable_beginscan(depRel, DependReferenceIndexId, true,
6953 : NULL, 2, key);
6954 :
6955 6828 : while (HeapTupleIsValid(depTup = systable_getnext(depScan)))
6956 : {
6957 2508 : Form_pg_depend pg_depend = (Form_pg_depend) GETSTRUCT(depTup);
6958 : Relation rel;
6959 : TupleDesc tupleDesc;
6960 : Form_pg_attribute att;
6961 :
6962 : /* Check for directly dependent types */
6963 2508 : if (pg_depend->classid == TypeRelationId)
6964 : {
6965 : /*
6966 : * This must be an array, domain, or range containing the given
6967 : * type, so recursively check for uses of this type. Note that
6968 : * any error message will mention the original type not the
6969 : * container; this is intentional.
6970 : */
6971 2138 : find_composite_type_dependencies(pg_depend->objid,
6972 : origRelation, origTypeName);
6973 2114 : continue;
6974 : }
6975 :
6976 : /* Else, ignore dependees that aren't relations */
6977 370 : if (pg_depend->classid != RelationRelationId)
6978 122 : continue;
6979 :
6980 248 : rel = relation_open(pg_depend->objid, AccessShareLock);
6981 248 : tupleDesc = RelationGetDescr(rel);
6982 :
6983 : /*
6984 : * If objsubid identifies a specific column, refer to that in error
6985 : * messages. Otherwise, search to see if there's a user column of the
6986 : * type. (We assume system columns are never of interesting types.)
6987 : * The search is needed because an index containing an expression
6988 : * column of the target type will just be recorded as a whole-relation
6989 : * dependency. If we do not find a column of the type, the dependency
6990 : * must indicate that the type is transiently referenced in an index
6991 : * expression but not stored on disk, which we assume is OK, just as
6992 : * we do for references in views. (It could also be that the target
6993 : * type is embedded in some container type that is stored in an index
6994 : * column, but the previous recursion should catch such cases.)
6995 : */
6996 248 : if (pg_depend->objsubid > 0 && pg_depend->objsubid <= tupleDesc->natts)
6997 90 : att = TupleDescAttr(tupleDesc, pg_depend->objsubid - 1);
6998 : else
6999 : {
7000 158 : att = NULL;
7001 406 : for (int attno = 1; attno <= tupleDesc->natts; attno++)
7002 : {
7003 254 : att = TupleDescAttr(tupleDesc, attno - 1);
7004 254 : if (att->atttypid == typeOid && !att->attisdropped)
7005 6 : break;
7006 248 : att = NULL;
7007 : }
7008 158 : if (att == NULL)
7009 : {
7010 : /* No such column, so assume OK */
7011 152 : relation_close(rel, AccessShareLock);
7012 152 : continue;
7013 : }
7014 : }
7015 :
7016 : /*
7017 : * We definitely should reject if the relation has storage. If it's
7018 : * partitioned, then perhaps we don't have to reject: if there are
7019 : * partitions then we'll fail when we find one, else there is no
7020 : * stored data to worry about. However, it's possible that the type
7021 : * change would affect conclusions about whether the type is sortable
7022 : * or hashable and thus (if it's a partitioning column) break the
7023 : * partitioning rule. For now, reject for partitioned rels too.
7024 : */
7025 96 : if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind) ||
7026 0 : RELKIND_HAS_PARTITIONS(rel->rd_rel->relkind))
7027 : {
7028 96 : if (origTypeName)
7029 30 : ereport(ERROR,
7030 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7031 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7032 : origTypeName,
7033 : RelationGetRelationName(rel),
7034 : NameStr(att->attname))));
7035 66 : else if (origRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7036 18 : ereport(ERROR,
7037 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7038 : errmsg("cannot alter type \"%s\" because column \"%s.%s\" uses it",
7039 : RelationGetRelationName(origRelation),
7040 : RelationGetRelationName(rel),
7041 : NameStr(att->attname))));
7042 48 : else if (origRelation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
7043 6 : ereport(ERROR,
7044 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7045 : errmsg("cannot alter foreign table \"%s\" because column \"%s.%s\" uses its row type",
7046 : RelationGetRelationName(origRelation),
7047 : RelationGetRelationName(rel),
7048 : NameStr(att->attname))));
7049 : else
7050 42 : ereport(ERROR,
7051 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7052 : errmsg("cannot alter table \"%s\" because column \"%s.%s\" uses its row type",
7053 : RelationGetRelationName(origRelation),
7054 : RelationGetRelationName(rel),
7055 : NameStr(att->attname))));
7056 : }
7057 0 : else if (OidIsValid(rel->rd_rel->reltype))
7058 : {
7059 : /*
7060 : * A view or composite type itself isn't a problem, but we must
7061 : * recursively check for indirect dependencies via its rowtype.
7062 : */
7063 0 : find_composite_type_dependencies(rel->rd_rel->reltype,
7064 : origRelation, origTypeName);
7065 : }
7066 :
7067 0 : relation_close(rel, AccessShareLock);
7068 : }
7069 :
7070 4320 : systable_endscan(depScan);
7071 :
7072 4320 : relation_close(depRel, AccessShareLock);
7073 4320 : }
7074 :
7075 :
7076 : /*
7077 : * find_typed_table_dependencies
7078 : *
7079 : * Check to see if a composite type is being used as the type of a
7080 : * typed table. Abort if any are found and behavior is RESTRICT.
7081 : * Else return the list of tables.
7082 : */
7083 : static List *
7084 216 : find_typed_table_dependencies(Oid typeOid, const char *typeName, DropBehavior behavior)
7085 : {
7086 : Relation classRel;
7087 : ScanKeyData key[1];
7088 : TableScanDesc scan;
7089 : HeapTuple tuple;
7090 216 : List *result = NIL;
7091 :
7092 216 : classRel = table_open(RelationRelationId, AccessShareLock);
7093 :
7094 216 : ScanKeyInit(&key[0],
7095 : Anum_pg_class_reloftype,
7096 : BTEqualStrategyNumber, F_OIDEQ,
7097 : ObjectIdGetDatum(typeOid));
7098 :
7099 216 : scan = table_beginscan_catalog(classRel, 1, key);
7100 :
7101 252 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
7102 : {
7103 60 : Form_pg_class classform = (Form_pg_class) GETSTRUCT(tuple);
7104 :
7105 60 : if (behavior == DROP_RESTRICT)
7106 24 : ereport(ERROR,
7107 : (errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
7108 : errmsg("cannot alter type \"%s\" because it is the type of a typed table",
7109 : typeName),
7110 : errhint("Use ALTER ... CASCADE to alter the typed tables too.")));
7111 : else
7112 36 : result = lappend_oid(result, classform->oid);
7113 : }
7114 :
7115 192 : table_endscan(scan);
7116 192 : table_close(classRel, AccessShareLock);
7117 :
7118 192 : return result;
7119 : }
7120 :
7121 :
7122 : /*
7123 : * check_of_type
7124 : *
7125 : * Check whether a type is suitable for CREATE TABLE OF/ALTER TABLE OF. If it
7126 : * isn't suitable, throw an error. Currently, we require that the type
7127 : * originated with CREATE TYPE AS. We could support any row type, but doing so
7128 : * would require handling a number of extra corner cases in the DDL commands.
7129 : * (Also, allowing domain-over-composite would open up a can of worms about
7130 : * whether and how the domain's constraints should apply to derived tables.)
7131 : */
7132 : void
7133 194 : check_of_type(HeapTuple typetuple)
7134 : {
7135 194 : Form_pg_type typ = (Form_pg_type) GETSTRUCT(typetuple);
7136 194 : bool typeOk = false;
7137 :
7138 194 : if (typ->typtype == TYPTYPE_COMPOSITE)
7139 : {
7140 : Relation typeRelation;
7141 :
7142 : Assert(OidIsValid(typ->typrelid));
7143 188 : typeRelation = relation_open(typ->typrelid, AccessShareLock);
7144 188 : typeOk = (typeRelation->rd_rel->relkind == RELKIND_COMPOSITE_TYPE);
7145 :
7146 : /*
7147 : * Close the parent rel, but keep our AccessShareLock on it until xact
7148 : * commit. That will prevent someone else from deleting or ALTERing
7149 : * the type before the typed table creation/conversion commits.
7150 : */
7151 188 : relation_close(typeRelation, NoLock);
7152 :
7153 188 : if (!typeOk)
7154 6 : ereport(ERROR,
7155 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7156 : errmsg("type %s is the row type of another table",
7157 : format_type_be(typ->oid)),
7158 : errdetail("A typed table must use a stand-alone composite type created with CREATE TYPE.")));
7159 : }
7160 : else
7161 6 : ereport(ERROR,
7162 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7163 : errmsg("type %s is not a composite type",
7164 : format_type_be(typ->oid))));
7165 182 : }
7166 :
7167 :
7168 : /*
7169 : * ALTER TABLE ADD COLUMN
7170 : *
7171 : * Adds an additional attribute to a relation making the assumption that
7172 : * CHECK, NOT NULL, and FOREIGN KEY constraints will be removed from the
7173 : * AT_AddColumn AlterTableCmd by parse_utilcmd.c and added as independent
7174 : * AlterTableCmd's.
7175 : *
7176 : * ADD COLUMN cannot use the normal ALTER TABLE recursion mechanism, because we
7177 : * have to decide at runtime whether to recurse or not depending on whether we
7178 : * actually add a column or merely merge with an existing column. (We can't
7179 : * check this in a static pre-pass because it won't handle multiple inheritance
7180 : * situations correctly.)
7181 : */
7182 : static void
7183 2182 : ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
7184 : bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
7185 : AlterTableUtilityContext *context)
7186 : {
7187 2182 : if (rel->rd_rel->reloftype && !recursing)
7188 6 : ereport(ERROR,
7189 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7190 : errmsg("cannot add column to typed table")));
7191 :
7192 2176 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
7193 58 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
7194 :
7195 2170 : if (recurse && !is_view)
7196 2070 : cmd->recurse = true;
7197 2170 : }
7198 :
7199 : /*
7200 : * Add a column to a table. The return value is the address of the
7201 : * new column in the parent relation.
7202 : *
7203 : * cmd is pass-by-ref so that we can replace it with the parse-transformed
7204 : * copy (but that happens only after we check for IF NOT EXISTS).
7205 : */
7206 : static ObjectAddress
7207 2902 : ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
7208 : AlterTableCmd **cmd, bool recurse, bool recursing,
7209 : LOCKMODE lockmode, AlterTablePass cur_pass,
7210 : AlterTableUtilityContext *context)
7211 : {
7212 2902 : Oid myrelid = RelationGetRelid(rel);
7213 2902 : ColumnDef *colDef = castNode(ColumnDef, (*cmd)->def);
7214 2902 : bool if_not_exists = (*cmd)->missing_ok;
7215 : Relation pgclass,
7216 : attrdesc;
7217 : HeapTuple reltup;
7218 : Form_pg_class relform;
7219 : Form_pg_attribute attribute;
7220 : int newattnum;
7221 : char relkind;
7222 : Expr *defval;
7223 : List *children;
7224 : ListCell *child;
7225 : AlterTableCmd *childcmd;
7226 : ObjectAddress address;
7227 : TupleDesc tupdesc;
7228 :
7229 : /* since this function recurses, it could be driven to stack overflow */
7230 2902 : check_stack_depth();
7231 :
7232 : /* At top level, permission check was done in ATPrepCmd, else do it */
7233 2902 : if (recursing)
7234 738 : ATSimplePermissions((*cmd)->subtype, rel,
7235 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
7236 :
7237 2902 : if (rel->rd_rel->relispartition && !recursing)
7238 12 : ereport(ERROR,
7239 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
7240 : errmsg("cannot add column to a partition")));
7241 :
7242 2890 : attrdesc = table_open(AttributeRelationId, RowExclusiveLock);
7243 :
7244 : /*
7245 : * Are we adding the column to a recursion child? If so, check whether to
7246 : * merge with an existing definition for the column. If we do merge, we
7247 : * must not recurse. Children will already have the column, and recursing
7248 : * into them would mess up attinhcount.
7249 : */
7250 2890 : if (colDef->inhcount > 0)
7251 : {
7252 : HeapTuple tuple;
7253 :
7254 : /* Does child already have a column by this name? */
7255 738 : tuple = SearchSysCacheCopyAttName(myrelid, colDef->colname);
7256 738 : if (HeapTupleIsValid(tuple))
7257 : {
7258 60 : Form_pg_attribute childatt = (Form_pg_attribute) GETSTRUCT(tuple);
7259 : Oid ctypeId;
7260 : int32 ctypmod;
7261 : Oid ccollid;
7262 :
7263 : /* Child column must match on type, typmod, and collation */
7264 60 : typenameTypeIdAndMod(NULL, colDef->typeName, &ctypeId, &ctypmod);
7265 60 : if (ctypeId != childatt->atttypid ||
7266 60 : ctypmod != childatt->atttypmod)
7267 0 : ereport(ERROR,
7268 : (errcode(ERRCODE_DATATYPE_MISMATCH),
7269 : errmsg("child table \"%s\" has different type for column \"%s\"",
7270 : RelationGetRelationName(rel), colDef->colname)));
7271 60 : ccollid = GetColumnDefCollation(NULL, colDef, ctypeId);
7272 60 : if (ccollid != childatt->attcollation)
7273 0 : ereport(ERROR,
7274 : (errcode(ERRCODE_COLLATION_MISMATCH),
7275 : errmsg("child table \"%s\" has different collation for column \"%s\"",
7276 : RelationGetRelationName(rel), colDef->colname),
7277 : errdetail("\"%s\" versus \"%s\"",
7278 : get_collation_name(ccollid),
7279 : get_collation_name(childatt->attcollation))));
7280 :
7281 : /* Bump the existing child att's inhcount */
7282 60 : if (pg_add_s16_overflow(childatt->attinhcount, 1,
7283 : &childatt->attinhcount))
7284 0 : ereport(ERROR,
7285 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7286 : errmsg("too many inheritance parents"));
7287 60 : CatalogTupleUpdate(attrdesc, &tuple->t_self, tuple);
7288 :
7289 60 : heap_freetuple(tuple);
7290 :
7291 : /* Inform the user about the merge */
7292 60 : ereport(NOTICE,
7293 : (errmsg("merging definition of column \"%s\" for child \"%s\"",
7294 : colDef->colname, RelationGetRelationName(rel))));
7295 :
7296 60 : table_close(attrdesc, RowExclusiveLock);
7297 :
7298 : /* Make the child column change visible */
7299 60 : CommandCounterIncrement();
7300 :
7301 60 : return InvalidObjectAddress;
7302 : }
7303 : }
7304 :
7305 : /* skip if the name already exists and if_not_exists is true */
7306 2830 : if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
7307 : {
7308 54 : table_close(attrdesc, RowExclusiveLock);
7309 54 : return InvalidObjectAddress;
7310 : }
7311 :
7312 : /*
7313 : * Okay, we need to add the column, so go ahead and do parse
7314 : * transformation. This can result in queueing up, or even immediately
7315 : * executing, subsidiary operations (such as creation of unique indexes);
7316 : * so we mustn't do it until we have made the if_not_exists check.
7317 : *
7318 : * When recursing, the command was already transformed and we needn't do
7319 : * so again. Also, if context isn't given we can't transform. (That
7320 : * currently happens only for AT_AddColumnToView; we expect that view.c
7321 : * passed us a ColumnDef that doesn't need work.)
7322 : */
7323 2746 : if (context != NULL && !recursing)
7324 : {
7325 2044 : *cmd = ATParseTransformCmd(wqueue, tab, rel, *cmd, recurse, lockmode,
7326 : cur_pass, context);
7327 : Assert(*cmd != NULL);
7328 2038 : colDef = castNode(ColumnDef, (*cmd)->def);
7329 : }
7330 :
7331 : /*
7332 : * Regular inheritance children are independent enough not to inherit the
7333 : * identity column from parent hence cannot recursively add identity
7334 : * column if the table has inheritance children.
7335 : *
7336 : * Partitions, on the other hand, are integral part of a partitioned table
7337 : * and inherit identity column. Hence propagate identity column down the
7338 : * partition hierarchy.
7339 : */
7340 2740 : if (colDef->identity &&
7341 54 : recurse &&
7342 102 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE &&
7343 48 : find_inheritance_children(myrelid, NoLock) != NIL)
7344 6 : ereport(ERROR,
7345 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7346 : errmsg("cannot recursively add identity column to table that has child tables")));
7347 :
7348 2734 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
7349 :
7350 2734 : reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
7351 2734 : if (!HeapTupleIsValid(reltup))
7352 0 : elog(ERROR, "cache lookup failed for relation %u", myrelid);
7353 2734 : relform = (Form_pg_class) GETSTRUCT(reltup);
7354 2734 : relkind = relform->relkind;
7355 :
7356 : /* Determine the new attribute's number */
7357 2734 : newattnum = relform->relnatts + 1;
7358 2734 : if (newattnum > MaxHeapAttributeNumber)
7359 0 : ereport(ERROR,
7360 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
7361 : errmsg("tables can have at most %d columns",
7362 : MaxHeapAttributeNumber)));
7363 :
7364 : /*
7365 : * Construct new attribute's pg_attribute entry.
7366 : */
7367 2734 : tupdesc = BuildDescForRelation(list_make1(colDef));
7368 :
7369 2722 : attribute = TupleDescAttr(tupdesc, 0);
7370 :
7371 : /* Fix up attribute number */
7372 2722 : attribute->attnum = newattnum;
7373 :
7374 : /* make sure datatype is legal for a column */
7375 2722 : CheckAttributeType(NameStr(attribute->attname), attribute->atttypid, attribute->attcollation,
7376 2722 : list_make1_oid(rel->rd_rel->reltype),
7377 : 0);
7378 :
7379 2692 : InsertPgAttributeTuples(attrdesc, tupdesc, myrelid, NULL, NULL);
7380 :
7381 2692 : table_close(attrdesc, RowExclusiveLock);
7382 :
7383 : /*
7384 : * Update pg_class tuple as appropriate
7385 : */
7386 2692 : relform->relnatts = newattnum;
7387 :
7388 2692 : CatalogTupleUpdate(pgclass, &reltup->t_self, reltup);
7389 :
7390 2692 : heap_freetuple(reltup);
7391 :
7392 : /* Post creation hook for new attribute */
7393 2692 : InvokeObjectPostCreateHook(RelationRelationId, myrelid, newattnum);
7394 :
7395 2692 : table_close(pgclass, RowExclusiveLock);
7396 :
7397 : /* Make the attribute's catalog entry visible */
7398 2692 : CommandCounterIncrement();
7399 :
7400 : /*
7401 : * Store the DEFAULT, if any, in the catalogs
7402 : */
7403 2692 : if (colDef->raw_default)
7404 : {
7405 : RawColumnDefault *rawEnt;
7406 :
7407 924 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
7408 924 : rawEnt->attnum = attribute->attnum;
7409 924 : rawEnt->raw_default = copyObject(colDef->raw_default);
7410 924 : rawEnt->generated = colDef->generated;
7411 :
7412 : /*
7413 : * This function is intended for CREATE TABLE, so it processes a
7414 : * _list_ of defaults, but we just do one.
7415 : */
7416 924 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
7417 : false, true, false, NULL);
7418 :
7419 : /* Make the additional catalog changes visible */
7420 900 : CommandCounterIncrement();
7421 : }
7422 :
7423 : /*
7424 : * Tell Phase 3 to fill in the default expression, if there is one.
7425 : *
7426 : * If there is no default, Phase 3 doesn't have to do anything, because
7427 : * that effectively means that the default is NULL. The heap tuple access
7428 : * routines always check for attnum > # of attributes in tuple, and return
7429 : * NULL if so, so without any modification of the tuple data we will get
7430 : * the effect of NULL values in the new column.
7431 : *
7432 : * An exception occurs when the new column is of a domain type: the domain
7433 : * might have a not-null constraint, or a check constraint that indirectly
7434 : * rejects nulls. If there are any domain constraints then we construct
7435 : * an explicit NULL default value that will be passed through
7436 : * CoerceToDomain processing. (This is a tad inefficient, since it causes
7437 : * rewriting the table which we really wouldn't have to do; but we do it
7438 : * to preserve the historical behavior that such a failure will be raised
7439 : * only if the table currently contains some rows.)
7440 : *
7441 : * Note: we use build_column_default, and not just the cooked default
7442 : * returned by AddRelationNewConstraints, so that the right thing happens
7443 : * when a datatype's default applies.
7444 : *
7445 : * Note: it might seem that this should happen at the end of Phase 2, so
7446 : * that the effects of subsequent subcommands can be taken into account.
7447 : * It's intentional that we do it now, though. The new column should be
7448 : * filled according to what is said in the ADD COLUMN subcommand, so that
7449 : * the effects are the same as if this subcommand had been run by itself
7450 : * and the later subcommands had been issued in new ALTER TABLE commands.
7451 : *
7452 : * We can skip this entirely for relations without storage, since Phase 3
7453 : * is certainly not going to touch them.
7454 : */
7455 2668 : if (RELKIND_HAS_STORAGE(relkind))
7456 : {
7457 : bool has_domain_constraints;
7458 2292 : bool has_missing = false;
7459 :
7460 : /*
7461 : * For an identity column, we can't use build_column_default(),
7462 : * because the sequence ownership isn't set yet. So do it manually.
7463 : */
7464 2292 : if (colDef->identity)
7465 : {
7466 42 : NextValueExpr *nve = makeNode(NextValueExpr);
7467 :
7468 42 : nve->seqid = RangeVarGetRelid(colDef->identitySequence, NoLock, false);
7469 42 : nve->typeId = attribute->atttypid;
7470 :
7471 42 : defval = (Expr *) nve;
7472 : }
7473 : else
7474 2250 : defval = (Expr *) build_column_default(rel, attribute->attnum);
7475 :
7476 : /* Build CoerceToDomain(NULL) expression if needed */
7477 2292 : has_domain_constraints = DomainHasConstraints(attribute->atttypid);
7478 2292 : if (!defval && has_domain_constraints)
7479 : {
7480 : Oid baseTypeId;
7481 : int32 baseTypeMod;
7482 : Oid baseTypeColl;
7483 :
7484 6 : baseTypeMod = attribute->atttypmod;
7485 6 : baseTypeId = getBaseTypeAndTypmod(attribute->atttypid, &baseTypeMod);
7486 6 : baseTypeColl = get_typcollation(baseTypeId);
7487 6 : defval = (Expr *) makeNullConst(baseTypeId, baseTypeMod, baseTypeColl);
7488 6 : defval = (Expr *) coerce_to_target_type(NULL,
7489 : (Node *) defval,
7490 : baseTypeId,
7491 : attribute->atttypid,
7492 : attribute->atttypmod,
7493 : COERCION_ASSIGNMENT,
7494 : COERCE_IMPLICIT_CAST,
7495 : -1);
7496 6 : if (defval == NULL) /* should not happen */
7497 0 : elog(ERROR, "failed to coerce base type to domain");
7498 : }
7499 :
7500 2292 : if (defval)
7501 : {
7502 : NewColumnValue *newval;
7503 :
7504 : /* Prepare defval for execution, either here or in Phase 3 */
7505 808 : defval = expression_planner(defval);
7506 :
7507 : /* Add the new default to the newvals list */
7508 808 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
7509 808 : newval->attnum = attribute->attnum;
7510 808 : newval->expr = defval;
7511 808 : newval->is_generated = (colDef->generated != '\0');
7512 :
7513 808 : tab->newvals = lappend(tab->newvals, newval);
7514 :
7515 : /*
7516 : * Attempt to skip a complete table rewrite by storing the
7517 : * specified DEFAULT value outside of the heap. This is only
7518 : * allowed for plain relations and non-generated columns, and the
7519 : * default expression can't be volatile (stable is OK). Note that
7520 : * contain_volatile_functions deems CoerceToDomain immutable, but
7521 : * here we consider that coercion to a domain with constraints is
7522 : * volatile; else it might fail even when the table is empty.
7523 : */
7524 808 : if (rel->rd_rel->relkind == RELKIND_RELATION &&
7525 808 : !colDef->generated &&
7526 682 : !has_domain_constraints &&
7527 670 : !contain_volatile_functions((Node *) defval))
7528 502 : {
7529 : EState *estate;
7530 : ExprState *exprState;
7531 : Datum missingval;
7532 : bool missingIsNull;
7533 :
7534 : /* Evaluate the default expression */
7535 502 : estate = CreateExecutorState();
7536 502 : exprState = ExecPrepareExpr(defval, estate);
7537 502 : missingval = ExecEvalExpr(exprState,
7538 502 : GetPerTupleExprContext(estate),
7539 : &missingIsNull);
7540 : /* If it turns out NULL, nothing to do; else store it */
7541 502 : if (!missingIsNull)
7542 : {
7543 502 : StoreAttrMissingVal(rel, attribute->attnum, missingval);
7544 : /* Make the additional catalog change visible */
7545 502 : CommandCounterIncrement();
7546 502 : has_missing = true;
7547 : }
7548 502 : FreeExecutorState(estate);
7549 : }
7550 : else
7551 : {
7552 : /*
7553 : * Failed to use missing mode. We have to do a table rewrite
7554 : * to install the value --- unless it's a virtual generated
7555 : * column.
7556 : */
7557 306 : if (colDef->generated != ATTRIBUTE_GENERATED_VIRTUAL)
7558 216 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
7559 : }
7560 : }
7561 :
7562 2292 : if (!has_missing)
7563 : {
7564 : /*
7565 : * If the new column is NOT NULL, and there is no missing value,
7566 : * tell Phase 3 it needs to check for NULLs.
7567 : */
7568 1790 : tab->verify_new_notnull |= colDef->is_not_null;
7569 : }
7570 : }
7571 :
7572 : /*
7573 : * Add needed dependency entries for the new column.
7574 : */
7575 2668 : add_column_datatype_dependency(myrelid, newattnum, attribute->atttypid);
7576 2668 : add_column_collation_dependency(myrelid, newattnum, attribute->attcollation);
7577 :
7578 : /*
7579 : * Propagate to children as appropriate. Unlike most other ALTER
7580 : * routines, we have to do this one level of recursion at a time; we can't
7581 : * use find_all_inheritors to do it in one pass.
7582 : */
7583 : children =
7584 2668 : find_inheritance_children(RelationGetRelid(rel), lockmode);
7585 :
7586 : /*
7587 : * If we are told not to recurse, there had better not be any child
7588 : * tables; else the addition would put them out of step.
7589 : */
7590 2668 : if (children && !recurse)
7591 12 : ereport(ERROR,
7592 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7593 : errmsg("column must be added to child tables too")));
7594 :
7595 : /* Children should see column as singly inherited */
7596 2656 : if (!recursing)
7597 : {
7598 1978 : childcmd = copyObject(*cmd);
7599 1978 : colDef = castNode(ColumnDef, childcmd->def);
7600 1978 : colDef->inhcount = 1;
7601 1978 : colDef->is_local = false;
7602 : }
7603 : else
7604 678 : childcmd = *cmd; /* no need to copy again */
7605 :
7606 3394 : foreach(child, children)
7607 : {
7608 738 : Oid childrelid = lfirst_oid(child);
7609 : Relation childrel;
7610 : AlteredTableInfo *childtab;
7611 :
7612 : /* find_inheritance_children already got lock */
7613 738 : childrel = table_open(childrelid, NoLock);
7614 738 : CheckAlterTableIsSafe(childrel);
7615 :
7616 : /* Find or create work queue entry for this table */
7617 738 : childtab = ATGetQueueEntry(wqueue, childrel);
7618 :
7619 : /* Recurse to child; return value is ignored */
7620 738 : ATExecAddColumn(wqueue, childtab, childrel,
7621 : &childcmd, recurse, true,
7622 : lockmode, cur_pass, context);
7623 :
7624 738 : table_close(childrel, NoLock);
7625 : }
7626 :
7627 2656 : ObjectAddressSubSet(address, RelationRelationId, myrelid, newattnum);
7628 2656 : return address;
7629 : }
7630 :
7631 : /*
7632 : * If a new or renamed column will collide with the name of an existing
7633 : * column and if_not_exists is false then error out, else do nothing.
7634 : */
7635 : static bool
7636 3280 : check_for_column_name_collision(Relation rel, const char *colname,
7637 : bool if_not_exists)
7638 : {
7639 : HeapTuple attTuple;
7640 : int attnum;
7641 :
7642 : /*
7643 : * this test is deliberately not attisdropped-aware, since if one tries to
7644 : * add a column matching a dropped column name, it's gonna fail anyway.
7645 : */
7646 3280 : attTuple = SearchSysCache2(ATTNAME,
7647 : ObjectIdGetDatum(RelationGetRelid(rel)),
7648 : PointerGetDatum(colname));
7649 3280 : if (!HeapTupleIsValid(attTuple))
7650 3184 : return true;
7651 :
7652 96 : attnum = ((Form_pg_attribute) GETSTRUCT(attTuple))->attnum;
7653 96 : ReleaseSysCache(attTuple);
7654 :
7655 : /*
7656 : * We throw a different error message for conflicts with system column
7657 : * names, since they are normally not shown and the user might otherwise
7658 : * be confused about the reason for the conflict.
7659 : */
7660 96 : if (attnum <= 0)
7661 12 : ereport(ERROR,
7662 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7663 : errmsg("column name \"%s\" conflicts with a system column name",
7664 : colname)));
7665 : else
7666 : {
7667 84 : if (if_not_exists)
7668 : {
7669 54 : ereport(NOTICE,
7670 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7671 : errmsg("column \"%s\" of relation \"%s\" already exists, skipping",
7672 : colname, RelationGetRelationName(rel))));
7673 54 : return false;
7674 : }
7675 :
7676 30 : ereport(ERROR,
7677 : (errcode(ERRCODE_DUPLICATE_COLUMN),
7678 : errmsg("column \"%s\" of relation \"%s\" already exists",
7679 : colname, RelationGetRelationName(rel))));
7680 : }
7681 :
7682 : return true;
7683 : }
7684 :
7685 : /*
7686 : * Install a column's dependency on its datatype.
7687 : */
7688 : static void
7689 3680 : add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid)
7690 : {
7691 : ObjectAddress myself,
7692 : referenced;
7693 :
7694 3680 : myself.classId = RelationRelationId;
7695 3680 : myself.objectId = relid;
7696 3680 : myself.objectSubId = attnum;
7697 3680 : referenced.classId = TypeRelationId;
7698 3680 : referenced.objectId = typid;
7699 3680 : referenced.objectSubId = 0;
7700 3680 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7701 3680 : }
7702 :
7703 : /*
7704 : * Install a column's dependency on its collation.
7705 : */
7706 : static void
7707 3680 : add_column_collation_dependency(Oid relid, int32 attnum, Oid collid)
7708 : {
7709 : ObjectAddress myself,
7710 : referenced;
7711 :
7712 : /* We know the default collation is pinned, so don't bother recording it */
7713 3680 : if (OidIsValid(collid) && collid != DEFAULT_COLLATION_OID)
7714 : {
7715 18 : myself.classId = RelationRelationId;
7716 18 : myself.objectId = relid;
7717 18 : myself.objectSubId = attnum;
7718 18 : referenced.classId = CollationRelationId;
7719 18 : referenced.objectId = collid;
7720 18 : referenced.objectSubId = 0;
7721 18 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
7722 : }
7723 3680 : }
7724 :
7725 : /*
7726 : * ALTER TABLE ALTER COLUMN DROP NOT NULL
7727 : *
7728 : * Return the address of the modified column. If the column was already
7729 : * nullable, InvalidObjectAddress is returned.
7730 : */
7731 : static ObjectAddress
7732 268 : ATExecDropNotNull(Relation rel, const char *colName, bool recurse,
7733 : LOCKMODE lockmode)
7734 : {
7735 : HeapTuple tuple;
7736 : HeapTuple conTup;
7737 : Form_pg_attribute attTup;
7738 : AttrNumber attnum;
7739 : Relation attr_rel;
7740 : ObjectAddress address;
7741 :
7742 : /*
7743 : * lookup the attribute
7744 : */
7745 268 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7746 :
7747 268 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
7748 268 : if (!HeapTupleIsValid(tuple))
7749 18 : ereport(ERROR,
7750 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7751 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7752 : colName, RelationGetRelationName(rel))));
7753 250 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
7754 250 : attnum = attTup->attnum;
7755 250 : ObjectAddressSubSet(address, RelationRelationId,
7756 : RelationGetRelid(rel), attnum);
7757 :
7758 : /* If the column is already nullable there's nothing to do. */
7759 250 : if (!attTup->attnotnull)
7760 : {
7761 0 : table_close(attr_rel, RowExclusiveLock);
7762 0 : return InvalidObjectAddress;
7763 : }
7764 :
7765 : /* Prevent them from altering a system attribute */
7766 250 : if (attnum <= 0)
7767 0 : ereport(ERROR,
7768 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7769 : errmsg("cannot alter system column \"%s\"",
7770 : colName)));
7771 :
7772 250 : if (attTup->attidentity)
7773 18 : ereport(ERROR,
7774 : (errcode(ERRCODE_SYNTAX_ERROR),
7775 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
7776 : colName, RelationGetRelationName(rel))));
7777 :
7778 : /*
7779 : * If rel is partition, shouldn't drop NOT NULL if parent has the same.
7780 : */
7781 232 : if (rel->rd_rel->relispartition)
7782 : {
7783 12 : Oid parentId = get_partition_parent(RelationGetRelid(rel), false);
7784 12 : Relation parent = table_open(parentId, AccessShareLock);
7785 12 : TupleDesc tupDesc = RelationGetDescr(parent);
7786 : AttrNumber parent_attnum;
7787 :
7788 12 : parent_attnum = get_attnum(parentId, colName);
7789 12 : if (TupleDescAttr(tupDesc, parent_attnum - 1)->attnotnull)
7790 12 : ereport(ERROR,
7791 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
7792 : errmsg("column \"%s\" is marked NOT NULL in parent table",
7793 : colName)));
7794 0 : table_close(parent, AccessShareLock);
7795 : }
7796 :
7797 : /*
7798 : * Find the constraint that makes this column NOT NULL, and drop it.
7799 : * dropconstraint_internal() resets attnotnull.
7800 : */
7801 220 : conTup = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7802 220 : if (conTup == NULL)
7803 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
7804 : colName, RelationGetRelationName(rel));
7805 :
7806 : /* The normal case: we have a pg_constraint row, remove it */
7807 220 : dropconstraint_internal(rel, conTup, DROP_RESTRICT, recurse, false,
7808 : false, lockmode);
7809 166 : heap_freetuple(conTup);
7810 :
7811 166 : InvokeObjectPostAlterHook(RelationRelationId,
7812 : RelationGetRelid(rel), attnum);
7813 :
7814 166 : table_close(attr_rel, RowExclusiveLock);
7815 :
7816 166 : return address;
7817 : }
7818 :
7819 : /*
7820 : * set_attnotnull
7821 : * Helper to update/validate the pg_attribute status of a not-null
7822 : * constraint
7823 : *
7824 : * pg_attribute.attnotnull is set true, if it isn't already.
7825 : * If queue_validation is true, also set up wqueue to validate the constraint.
7826 : * wqueue may be given as NULL when validation is not needed (e.g., on table
7827 : * creation).
7828 : */
7829 : static void
7830 25264 : set_attnotnull(List **wqueue, Relation rel, AttrNumber attnum,
7831 : bool is_valid, bool queue_validation)
7832 : {
7833 : Form_pg_attribute attr;
7834 : CompactAttribute *thisatt;
7835 :
7836 : Assert(!queue_validation || wqueue);
7837 :
7838 25264 : CheckAlterTableIsSafe(rel);
7839 :
7840 : /*
7841 : * Exit quickly by testing attnotnull from the tupledesc's copy of the
7842 : * attribute.
7843 : */
7844 25264 : attr = TupleDescAttr(RelationGetDescr(rel), attnum - 1);
7845 25264 : if (attr->attisdropped)
7846 0 : return;
7847 :
7848 25264 : if (!attr->attnotnull)
7849 : {
7850 : Relation attr_rel;
7851 : HeapTuple tuple;
7852 :
7853 1478 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
7854 :
7855 1478 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
7856 1478 : if (!HeapTupleIsValid(tuple))
7857 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
7858 : attnum, RelationGetRelid(rel));
7859 :
7860 1478 : thisatt = TupleDescCompactAttr(RelationGetDescr(rel), attnum - 1);
7861 1478 : thisatt->attnullability = ATTNULLABLE_VALID;
7862 :
7863 1478 : attr = (Form_pg_attribute) GETSTRUCT(tuple);
7864 :
7865 1478 : attr->attnotnull = true;
7866 1478 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
7867 :
7868 : /*
7869 : * If the nullness isn't already proven by validated constraints, have
7870 : * ALTER TABLE phase 3 test for it.
7871 : */
7872 1478 : if (queue_validation && wqueue &&
7873 1238 : !NotNullImpliedByRelConstraints(rel, attr))
7874 : {
7875 : AlteredTableInfo *tab;
7876 :
7877 1188 : tab = ATGetQueueEntry(wqueue, rel);
7878 1188 : tab->verify_new_notnull = true;
7879 : }
7880 :
7881 1478 : CommandCounterIncrement();
7882 :
7883 1478 : table_close(attr_rel, RowExclusiveLock);
7884 1478 : heap_freetuple(tuple);
7885 : }
7886 : else
7887 : {
7888 23786 : CacheInvalidateRelcache(rel);
7889 : }
7890 : }
7891 :
7892 : /*
7893 : * ALTER TABLE ALTER COLUMN SET NOT NULL
7894 : *
7895 : * Add a not-null constraint to a single table and its children. Returns
7896 : * the address of the constraint added to the parent relation, if one gets
7897 : * added, or InvalidObjectAddress otherwise.
7898 : *
7899 : * We must recurse to child tables during execution, rather than using
7900 : * ALTER TABLE's normal prep-time recursion.
7901 : */
7902 : static ObjectAddress
7903 706 : ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
7904 : bool recurse, bool recursing, LOCKMODE lockmode)
7905 : {
7906 : HeapTuple tuple;
7907 : AttrNumber attnum;
7908 : ObjectAddress address;
7909 : Constraint *constraint;
7910 : CookedConstraint *ccon;
7911 : List *cooked;
7912 706 : bool is_no_inherit = false;
7913 :
7914 : /* Guard against stack overflow due to overly deep inheritance tree. */
7915 706 : check_stack_depth();
7916 :
7917 : /* At top level, permission check was done in ATPrepCmd, else do it */
7918 706 : if (recursing)
7919 : {
7920 298 : ATSimplePermissions(AT_AddConstraint, rel,
7921 : ATT_PARTITIONED_TABLE | ATT_TABLE | ATT_FOREIGN_TABLE);
7922 : Assert(conName != NULL);
7923 : }
7924 :
7925 706 : attnum = get_attnum(RelationGetRelid(rel), colName);
7926 706 : if (attnum == InvalidAttrNumber)
7927 18 : ereport(ERROR,
7928 : (errcode(ERRCODE_UNDEFINED_COLUMN),
7929 : errmsg("column \"%s\" of relation \"%s\" does not exist",
7930 : colName, RelationGetRelationName(rel))));
7931 :
7932 : /* Prevent them from altering a system attribute */
7933 688 : if (attnum <= 0)
7934 0 : ereport(ERROR,
7935 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7936 : errmsg("cannot alter system column \"%s\"",
7937 : colName)));
7938 :
7939 : /* See if there's already a constraint */
7940 688 : tuple = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
7941 688 : if (HeapTupleIsValid(tuple))
7942 : {
7943 158 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
7944 158 : bool changed = false;
7945 :
7946 : /*
7947 : * Don't let a NO INHERIT constraint be changed into inherit.
7948 : */
7949 158 : if (conForm->connoinherit && recurse)
7950 12 : ereport(ERROR,
7951 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
7952 : errmsg("cannot change NO INHERIT status of NOT NULL constraint \"%s\" on relation \"%s\"",
7953 : NameStr(conForm->conname),
7954 : RelationGetRelationName(rel)));
7955 :
7956 : /*
7957 : * If we find an appropriate constraint, we're almost done, but just
7958 : * need to change some properties on it: if we're recursing, increment
7959 : * coninhcount; if not, set conislocal if not already set.
7960 : */
7961 146 : if (recursing)
7962 : {
7963 102 : if (pg_add_s16_overflow(conForm->coninhcount, 1,
7964 : &conForm->coninhcount))
7965 0 : ereport(ERROR,
7966 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
7967 : errmsg("too many inheritance parents"));
7968 102 : changed = true;
7969 : }
7970 44 : else if (!conForm->conislocal)
7971 : {
7972 0 : conForm->conislocal = true;
7973 0 : changed = true;
7974 : }
7975 44 : else if (!conForm->convalidated)
7976 : {
7977 : /*
7978 : * Flip attnotnull and convalidated, and also validate the
7979 : * constraint.
7980 : */
7981 24 : return ATExecValidateConstraint(wqueue, rel, NameStr(conForm->conname),
7982 : recurse, recursing, lockmode);
7983 : }
7984 :
7985 122 : if (changed)
7986 : {
7987 : Relation constr_rel;
7988 :
7989 102 : constr_rel = table_open(ConstraintRelationId, RowExclusiveLock);
7990 :
7991 102 : CatalogTupleUpdate(constr_rel, &tuple->t_self, tuple);
7992 102 : ObjectAddressSet(address, ConstraintRelationId, conForm->oid);
7993 102 : table_close(constr_rel, RowExclusiveLock);
7994 : }
7995 :
7996 122 : if (changed)
7997 102 : return address;
7998 : else
7999 20 : return InvalidObjectAddress;
8000 : }
8001 :
8002 : /*
8003 : * If we're asked not to recurse, and children exist, raise an error for
8004 : * partitioned tables. For inheritance, we act as if NO INHERIT had been
8005 : * specified.
8006 : */
8007 554 : if (!recurse &&
8008 24 : find_inheritance_children(RelationGetRelid(rel),
8009 : NoLock) != NIL)
8010 : {
8011 18 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
8012 6 : ereport(ERROR,
8013 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8014 : errmsg("constraint must be added to child tables too"),
8015 : errhint("Do not specify the ONLY keyword."));
8016 : else
8017 12 : is_no_inherit = true;
8018 : }
8019 :
8020 : /*
8021 : * No constraint exists; we must add one. First determine a name to use,
8022 : * if we haven't already.
8023 : */
8024 524 : if (!recursing)
8025 : {
8026 : Assert(conName == NULL);
8027 334 : conName = ChooseConstraintName(RelationGetRelationName(rel),
8028 : colName, "not_null",
8029 334 : RelationGetNamespace(rel),
8030 : NIL);
8031 : }
8032 :
8033 524 : constraint = makeNotNullConstraint(makeString(colName));
8034 524 : constraint->is_no_inherit = is_no_inherit;
8035 524 : constraint->conname = conName;
8036 :
8037 : /* and do it */
8038 524 : cooked = AddRelationNewConstraints(rel, NIL, list_make1(constraint),
8039 524 : false, !recursing, false, NULL);
8040 524 : ccon = linitial(cooked);
8041 524 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
8042 :
8043 524 : InvokeObjectPostAlterHook(RelationRelationId,
8044 : RelationGetRelid(rel), attnum);
8045 :
8046 : /* Mark pg_attribute.attnotnull for the column and queue validation */
8047 524 : set_attnotnull(wqueue, rel, attnum, true, true);
8048 :
8049 : /*
8050 : * Recurse to propagate the constraint to children that don't have one.
8051 : */
8052 524 : if (recurse)
8053 : {
8054 : List *children;
8055 :
8056 506 : children = find_inheritance_children(RelationGetRelid(rel),
8057 : lockmode);
8058 :
8059 1244 : foreach_oid(childoid, children)
8060 : {
8061 244 : Relation childrel = table_open(childoid, NoLock);
8062 :
8063 244 : CommandCounterIncrement();
8064 :
8065 244 : ATExecSetNotNull(wqueue, childrel, conName, colName,
8066 : recurse, true, lockmode);
8067 238 : table_close(childrel, NoLock);
8068 : }
8069 : }
8070 :
8071 518 : return address;
8072 : }
8073 :
8074 : /*
8075 : * NotNullImpliedByRelConstraints
8076 : * Does rel's existing constraints imply NOT NULL for the given attribute?
8077 : */
8078 : static bool
8079 1238 : NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr)
8080 : {
8081 1238 : NullTest *nnulltest = makeNode(NullTest);
8082 :
8083 2476 : nnulltest->arg = (Expr *) makeVar(1,
8084 1238 : attr->attnum,
8085 : attr->atttypid,
8086 : attr->atttypmod,
8087 : attr->attcollation,
8088 : 0);
8089 1238 : nnulltest->nulltesttype = IS_NOT_NULL;
8090 :
8091 : /*
8092 : * argisrow = false is correct even for a composite column, because
8093 : * attnotnull does not represent a SQL-spec IS NOT NULL test in such a
8094 : * case, just IS DISTINCT FROM NULL.
8095 : */
8096 1238 : nnulltest->argisrow = false;
8097 1238 : nnulltest->location = -1;
8098 :
8099 1238 : if (ConstraintImpliedByRelConstraint(rel, list_make1(nnulltest), NIL))
8100 : {
8101 50 : ereport(DEBUG1,
8102 : (errmsg_internal("existing constraints on column \"%s.%s\" are sufficient to prove that it does not contain nulls",
8103 : RelationGetRelationName(rel), NameStr(attr->attname))));
8104 50 : return true;
8105 : }
8106 :
8107 1188 : return false;
8108 : }
8109 :
8110 : /*
8111 : * ALTER TABLE ALTER COLUMN SET/DROP DEFAULT
8112 : *
8113 : * Return the address of the affected column.
8114 : */
8115 : static ObjectAddress
8116 612 : ATExecColumnDefault(Relation rel, const char *colName,
8117 : Node *newDefault, LOCKMODE lockmode)
8118 : {
8119 612 : TupleDesc tupdesc = RelationGetDescr(rel);
8120 : AttrNumber attnum;
8121 : ObjectAddress address;
8122 :
8123 : /*
8124 : * get the number of the attribute
8125 : */
8126 612 : attnum = get_attnum(RelationGetRelid(rel), colName);
8127 612 : if (attnum == InvalidAttrNumber)
8128 30 : ereport(ERROR,
8129 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8130 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8131 : colName, RelationGetRelationName(rel))));
8132 :
8133 : /* Prevent them from altering a system attribute */
8134 582 : if (attnum <= 0)
8135 0 : ereport(ERROR,
8136 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8137 : errmsg("cannot alter system column \"%s\"",
8138 : colName)));
8139 :
8140 582 : if (TupleDescAttr(tupdesc, attnum - 1)->attidentity)
8141 18 : ereport(ERROR,
8142 : (errcode(ERRCODE_SYNTAX_ERROR),
8143 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
8144 : colName, RelationGetRelationName(rel)),
8145 : /* translator: %s is an SQL ALTER command */
8146 : newDefault ? 0 : errhint("Use %s instead.",
8147 : "ALTER TABLE ... ALTER COLUMN ... DROP IDENTITY")));
8148 :
8149 564 : if (TupleDescAttr(tupdesc, attnum - 1)->attgenerated)
8150 12 : ereport(ERROR,
8151 : (errcode(ERRCODE_SYNTAX_ERROR),
8152 : errmsg("column \"%s\" of relation \"%s\" is a generated column",
8153 : colName, RelationGetRelationName(rel)),
8154 : newDefault ?
8155 : /* translator: %s is an SQL ALTER command */
8156 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... SET EXPRESSION") :
8157 : (TupleDescAttr(tupdesc, attnum - 1)->attgenerated == ATTRIBUTE_GENERATED_STORED ?
8158 : errhint("Use %s instead.", "ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION") : 0)));
8159 :
8160 : /*
8161 : * Remove any old default for the column. We use RESTRICT here for
8162 : * safety, but at present we do not expect anything to depend on the
8163 : * default.
8164 : *
8165 : * We treat removing the existing default as an internal operation when it
8166 : * is preparatory to adding a new default, but as a user-initiated
8167 : * operation when the user asked for a drop.
8168 : */
8169 552 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8170 : newDefault != NULL);
8171 :
8172 552 : if (newDefault)
8173 : {
8174 : /* SET DEFAULT */
8175 : RawColumnDefault *rawEnt;
8176 :
8177 378 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
8178 378 : rawEnt->attnum = attnum;
8179 378 : rawEnt->raw_default = newDefault;
8180 378 : rawEnt->generated = '\0';
8181 :
8182 : /*
8183 : * This function is intended for CREATE TABLE, so it processes a
8184 : * _list_ of defaults, but we just do one.
8185 : */
8186 378 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8187 : false, true, false, NULL);
8188 : }
8189 :
8190 546 : ObjectAddressSubSet(address, RelationRelationId,
8191 : RelationGetRelid(rel), attnum);
8192 546 : return address;
8193 : }
8194 :
8195 : /*
8196 : * Add a pre-cooked default expression.
8197 : *
8198 : * Return the address of the affected column.
8199 : */
8200 : static ObjectAddress
8201 80 : ATExecCookedColumnDefault(Relation rel, AttrNumber attnum,
8202 : Node *newDefault)
8203 : {
8204 : ObjectAddress address;
8205 :
8206 : /* We assume no checking is required */
8207 :
8208 : /*
8209 : * Remove any old default for the column. We use RESTRICT here for
8210 : * safety, but at present we do not expect anything to depend on the
8211 : * default. (In ordinary cases, there could not be a default in place
8212 : * anyway, but it's possible when combining LIKE with inheritance.)
8213 : */
8214 80 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, false,
8215 : true);
8216 :
8217 80 : (void) StoreAttrDefault(rel, attnum, newDefault, true);
8218 :
8219 80 : ObjectAddressSubSet(address, RelationRelationId,
8220 : RelationGetRelid(rel), attnum);
8221 80 : return address;
8222 : }
8223 :
8224 : /*
8225 : * ALTER TABLE ALTER COLUMN ADD IDENTITY
8226 : *
8227 : * Return the address of the affected column.
8228 : */
8229 : static ObjectAddress
8230 204 : ATExecAddIdentity(Relation rel, const char *colName,
8231 : Node *def, LOCKMODE lockmode, bool recurse, bool recursing)
8232 : {
8233 : Relation attrelation;
8234 : HeapTuple tuple;
8235 : Form_pg_attribute attTup;
8236 : AttrNumber attnum;
8237 : ObjectAddress address;
8238 204 : ColumnDef *cdef = castNode(ColumnDef, def);
8239 : bool ispartitioned;
8240 :
8241 204 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8242 204 : if (ispartitioned && !recurse)
8243 6 : ereport(ERROR,
8244 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8245 : errmsg("cannot add identity to a column of only the partitioned table"),
8246 : errhint("Do not specify the ONLY keyword.")));
8247 :
8248 198 : if (rel->rd_rel->relispartition && !recursing)
8249 12 : ereport(ERROR,
8250 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8251 : errmsg("cannot add identity to a column of a partition"));
8252 :
8253 186 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8254 :
8255 186 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8256 186 : if (!HeapTupleIsValid(tuple))
8257 0 : ereport(ERROR,
8258 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8259 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8260 : colName, RelationGetRelationName(rel))));
8261 186 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8262 186 : attnum = attTup->attnum;
8263 :
8264 : /* Can't alter a system attribute */
8265 186 : if (attnum <= 0)
8266 0 : ereport(ERROR,
8267 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8268 : errmsg("cannot alter system column \"%s\"",
8269 : colName)));
8270 :
8271 : /*
8272 : * Creating a column as identity implies NOT NULL, so adding the identity
8273 : * to an existing column that is not NOT NULL would create a state that
8274 : * cannot be reproduced without contortions.
8275 : */
8276 186 : if (!attTup->attnotnull)
8277 6 : ereport(ERROR,
8278 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8279 : errmsg("column \"%s\" of relation \"%s\" must be declared NOT NULL before identity can be added",
8280 : colName, RelationGetRelationName(rel))));
8281 :
8282 180 : if (attTup->attidentity)
8283 18 : ereport(ERROR,
8284 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8285 : errmsg("column \"%s\" of relation \"%s\" is already an identity column",
8286 : colName, RelationGetRelationName(rel))));
8287 :
8288 162 : if (attTup->atthasdef)
8289 6 : ereport(ERROR,
8290 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8291 : errmsg("column \"%s\" of relation \"%s\" already has a default value",
8292 : colName, RelationGetRelationName(rel))));
8293 :
8294 156 : attTup->attidentity = cdef->identity;
8295 156 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8296 :
8297 156 : InvokeObjectPostAlterHook(RelationRelationId,
8298 : RelationGetRelid(rel),
8299 : attTup->attnum);
8300 156 : ObjectAddressSubSet(address, RelationRelationId,
8301 : RelationGetRelid(rel), attnum);
8302 156 : heap_freetuple(tuple);
8303 :
8304 156 : table_close(attrelation, RowExclusiveLock);
8305 :
8306 : /*
8307 : * Recurse to propagate the identity column to partitions. Identity is
8308 : * not inherited in regular inheritance children.
8309 : */
8310 156 : if (recurse && ispartitioned)
8311 : {
8312 : List *children;
8313 : ListCell *lc;
8314 :
8315 14 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8316 :
8317 20 : foreach(lc, children)
8318 : {
8319 : Relation childrel;
8320 :
8321 6 : childrel = table_open(lfirst_oid(lc), NoLock);
8322 6 : ATExecAddIdentity(childrel, colName, def, lockmode, recurse, true);
8323 6 : table_close(childrel, NoLock);
8324 : }
8325 : }
8326 :
8327 156 : return address;
8328 : }
8329 :
8330 : /*
8331 : * ALTER TABLE ALTER COLUMN SET { GENERATED or sequence options }
8332 : *
8333 : * Return the address of the affected column.
8334 : */
8335 : static ObjectAddress
8336 74 : ATExecSetIdentity(Relation rel, const char *colName, Node *def,
8337 : LOCKMODE lockmode, bool recurse, bool recursing)
8338 : {
8339 : ListCell *option;
8340 74 : DefElem *generatedEl = NULL;
8341 : HeapTuple tuple;
8342 : Form_pg_attribute attTup;
8343 : AttrNumber attnum;
8344 : Relation attrelation;
8345 : ObjectAddress address;
8346 : bool ispartitioned;
8347 :
8348 74 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8349 74 : if (ispartitioned && !recurse)
8350 6 : ereport(ERROR,
8351 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8352 : errmsg("cannot change identity column of only the partitioned table"),
8353 : errhint("Do not specify the ONLY keyword.")));
8354 :
8355 68 : if (rel->rd_rel->relispartition && !recursing)
8356 12 : ereport(ERROR,
8357 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8358 : errmsg("cannot change identity column of a partition"));
8359 :
8360 100 : foreach(option, castNode(List, def))
8361 : {
8362 44 : DefElem *defel = lfirst_node(DefElem, option);
8363 :
8364 44 : if (strcmp(defel->defname, "generated") == 0)
8365 : {
8366 44 : if (generatedEl)
8367 0 : ereport(ERROR,
8368 : (errcode(ERRCODE_SYNTAX_ERROR),
8369 : errmsg("conflicting or redundant options")));
8370 44 : generatedEl = defel;
8371 : }
8372 : else
8373 0 : elog(ERROR, "option \"%s\" not recognized",
8374 : defel->defname);
8375 : }
8376 :
8377 : /*
8378 : * Even if there is nothing to change here, we run all the checks. There
8379 : * will be a subsequent ALTER SEQUENCE that relies on everything being
8380 : * there.
8381 : */
8382 :
8383 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8384 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8385 56 : if (!HeapTupleIsValid(tuple))
8386 0 : ereport(ERROR,
8387 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8388 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8389 : colName, RelationGetRelationName(rel))));
8390 :
8391 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8392 56 : attnum = attTup->attnum;
8393 :
8394 56 : if (attnum <= 0)
8395 0 : ereport(ERROR,
8396 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8397 : errmsg("cannot alter system column \"%s\"",
8398 : colName)));
8399 :
8400 56 : if (!attTup->attidentity)
8401 6 : ereport(ERROR,
8402 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8403 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8404 : colName, RelationGetRelationName(rel))));
8405 :
8406 50 : if (generatedEl)
8407 : {
8408 44 : attTup->attidentity = defGetInt32(generatedEl);
8409 44 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8410 :
8411 44 : InvokeObjectPostAlterHook(RelationRelationId,
8412 : RelationGetRelid(rel),
8413 : attTup->attnum);
8414 44 : ObjectAddressSubSet(address, RelationRelationId,
8415 : RelationGetRelid(rel), attnum);
8416 : }
8417 : else
8418 6 : address = InvalidObjectAddress;
8419 :
8420 50 : heap_freetuple(tuple);
8421 50 : table_close(attrelation, RowExclusiveLock);
8422 :
8423 : /*
8424 : * Recurse to propagate the identity change to partitions. Identity is not
8425 : * inherited in regular inheritance children.
8426 : */
8427 50 : if (generatedEl && recurse && ispartitioned)
8428 : {
8429 : List *children;
8430 : ListCell *lc;
8431 :
8432 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8433 :
8434 18 : foreach(lc, children)
8435 : {
8436 : Relation childrel;
8437 :
8438 12 : childrel = table_open(lfirst_oid(lc), NoLock);
8439 12 : ATExecSetIdentity(childrel, colName, def, lockmode, recurse, true);
8440 12 : table_close(childrel, NoLock);
8441 : }
8442 : }
8443 :
8444 50 : return address;
8445 : }
8446 :
8447 : /*
8448 : * ALTER TABLE ALTER COLUMN DROP IDENTITY
8449 : *
8450 : * Return the address of the affected column.
8451 : */
8452 : static ObjectAddress
8453 68 : ATExecDropIdentity(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode,
8454 : bool recurse, bool recursing)
8455 : {
8456 : HeapTuple tuple;
8457 : Form_pg_attribute attTup;
8458 : AttrNumber attnum;
8459 : Relation attrelation;
8460 : ObjectAddress address;
8461 : Oid seqid;
8462 : ObjectAddress seqaddress;
8463 : bool ispartitioned;
8464 :
8465 68 : ispartitioned = (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
8466 68 : if (ispartitioned && !recurse)
8467 6 : ereport(ERROR,
8468 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8469 : errmsg("cannot drop identity from a column of only the partitioned table"),
8470 : errhint("Do not specify the ONLY keyword.")));
8471 :
8472 62 : if (rel->rd_rel->relispartition && !recursing)
8473 6 : ereport(ERROR,
8474 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8475 : errmsg("cannot drop identity from a column of a partition"));
8476 :
8477 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8478 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8479 56 : if (!HeapTupleIsValid(tuple))
8480 0 : ereport(ERROR,
8481 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8482 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8483 : colName, RelationGetRelationName(rel))));
8484 :
8485 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8486 56 : attnum = attTup->attnum;
8487 :
8488 56 : if (attnum <= 0)
8489 0 : ereport(ERROR,
8490 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8491 : errmsg("cannot alter system column \"%s\"",
8492 : colName)));
8493 :
8494 56 : if (!attTup->attidentity)
8495 : {
8496 12 : if (!missing_ok)
8497 6 : ereport(ERROR,
8498 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8499 : errmsg("column \"%s\" of relation \"%s\" is not an identity column",
8500 : colName, RelationGetRelationName(rel))));
8501 : else
8502 : {
8503 6 : ereport(NOTICE,
8504 : (errmsg("column \"%s\" of relation \"%s\" is not an identity column, skipping",
8505 : colName, RelationGetRelationName(rel))));
8506 6 : heap_freetuple(tuple);
8507 6 : table_close(attrelation, RowExclusiveLock);
8508 6 : return InvalidObjectAddress;
8509 : }
8510 : }
8511 :
8512 44 : attTup->attidentity = '\0';
8513 44 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8514 :
8515 44 : InvokeObjectPostAlterHook(RelationRelationId,
8516 : RelationGetRelid(rel),
8517 : attTup->attnum);
8518 44 : ObjectAddressSubSet(address, RelationRelationId,
8519 : RelationGetRelid(rel), attnum);
8520 44 : heap_freetuple(tuple);
8521 :
8522 44 : table_close(attrelation, RowExclusiveLock);
8523 :
8524 : /*
8525 : * Recurse to drop the identity from column in partitions. Identity is
8526 : * not inherited in regular inheritance children so ignore them.
8527 : */
8528 44 : if (recurse && ispartitioned)
8529 : {
8530 : List *children;
8531 : ListCell *lc;
8532 :
8533 6 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
8534 :
8535 12 : foreach(lc, children)
8536 : {
8537 : Relation childrel;
8538 :
8539 6 : childrel = table_open(lfirst_oid(lc), NoLock);
8540 6 : ATExecDropIdentity(childrel, colName, false, lockmode, recurse, true);
8541 6 : table_close(childrel, NoLock);
8542 : }
8543 : }
8544 :
8545 44 : if (!recursing)
8546 : {
8547 : /* drop the internal sequence */
8548 32 : seqid = getIdentitySequence(rel, attnum, false);
8549 32 : deleteDependencyRecordsForClass(RelationRelationId, seqid,
8550 : RelationRelationId, DEPENDENCY_INTERNAL);
8551 32 : CommandCounterIncrement();
8552 32 : seqaddress.classId = RelationRelationId;
8553 32 : seqaddress.objectId = seqid;
8554 32 : seqaddress.objectSubId = 0;
8555 32 : performDeletion(&seqaddress, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
8556 : }
8557 :
8558 44 : return address;
8559 : }
8560 :
8561 : /*
8562 : * ALTER TABLE ALTER COLUMN SET EXPRESSION
8563 : *
8564 : * Return the address of the affected column.
8565 : */
8566 : static ObjectAddress
8567 180 : ATExecSetExpression(AlteredTableInfo *tab, Relation rel, const char *colName,
8568 : Node *newExpr, LOCKMODE lockmode)
8569 : {
8570 : HeapTuple tuple;
8571 : Form_pg_attribute attTup;
8572 : AttrNumber attnum;
8573 : char attgenerated;
8574 : bool rewrite;
8575 : Oid attrdefoid;
8576 : ObjectAddress address;
8577 : Expr *defval;
8578 : NewColumnValue *newval;
8579 : RawColumnDefault *rawEnt;
8580 :
8581 180 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8582 180 : if (!HeapTupleIsValid(tuple))
8583 0 : ereport(ERROR,
8584 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8585 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8586 : colName, RelationGetRelationName(rel))));
8587 :
8588 180 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8589 :
8590 180 : attnum = attTup->attnum;
8591 180 : if (attnum <= 0)
8592 0 : ereport(ERROR,
8593 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8594 : errmsg("cannot alter system column \"%s\"",
8595 : colName)));
8596 :
8597 180 : attgenerated = attTup->attgenerated;
8598 180 : if (!attgenerated)
8599 12 : ereport(ERROR,
8600 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8601 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8602 : colName, RelationGetRelationName(rel))));
8603 :
8604 : /*
8605 : * TODO: This could be done, just need to recheck any constraints
8606 : * afterwards.
8607 : */
8608 168 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8609 90 : rel->rd_att->constr && rel->rd_att->constr->num_check > 0)
8610 12 : ereport(ERROR,
8611 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8612 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns on tables with check constraints"),
8613 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8614 : colName, RelationGetRelationName(rel))));
8615 :
8616 156 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL && attTup->attnotnull)
8617 24 : tab->verify_new_notnull = true;
8618 :
8619 : /*
8620 : * We need to prevent this because a change of expression could affect a
8621 : * row filter and inject expressions that are not permitted in a row
8622 : * filter. XXX We could try to have a more precise check to catch only
8623 : * publications with row filters, or even re-verify the row filter
8624 : * expressions.
8625 : */
8626 234 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL &&
8627 78 : GetRelationPublications(RelationGetRelid(rel)) != NIL)
8628 6 : ereport(ERROR,
8629 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8630 : errmsg("ALTER TABLE / SET EXPRESSION is not supported for virtual generated columns on tables that are part of a publication"),
8631 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8632 : colName, RelationGetRelationName(rel))));
8633 :
8634 150 : rewrite = (attgenerated == ATTRIBUTE_GENERATED_STORED);
8635 :
8636 150 : ReleaseSysCache(tuple);
8637 :
8638 150 : if (rewrite)
8639 : {
8640 : /*
8641 : * Clear all the missing values if we're rewriting the table, since
8642 : * this renders them pointless.
8643 : */
8644 78 : RelationClearMissing(rel);
8645 :
8646 : /* make sure we don't conflict with later attribute modifications */
8647 78 : CommandCounterIncrement();
8648 :
8649 : /*
8650 : * Find everything that depends on the column (constraints, indexes,
8651 : * etc), and record enough information to let us recreate the objects
8652 : * after rewrite.
8653 : */
8654 78 : RememberAllDependentForRebuilding(tab, AT_SetExpression, rel, attnum, colName);
8655 : }
8656 :
8657 : /*
8658 : * Drop the dependency records of the GENERATED expression, in particular
8659 : * its INTERNAL dependency on the column, which would otherwise cause
8660 : * dependency.c to refuse to perform the deletion.
8661 : */
8662 150 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8663 150 : if (!OidIsValid(attrdefoid))
8664 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8665 : RelationGetRelid(rel), attnum);
8666 150 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8667 :
8668 : /* Make above changes visible */
8669 150 : CommandCounterIncrement();
8670 :
8671 : /*
8672 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8673 : * safety, but at present we do not expect anything to depend on the
8674 : * expression.
8675 : */
8676 150 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8677 : false, false);
8678 :
8679 : /* Prepare to store the new expression, in the catalogs */
8680 150 : rawEnt = (RawColumnDefault *) palloc(sizeof(RawColumnDefault));
8681 150 : rawEnt->attnum = attnum;
8682 150 : rawEnt->raw_default = newExpr;
8683 150 : rawEnt->generated = attgenerated;
8684 :
8685 : /* Store the generated expression */
8686 150 : AddRelationNewConstraints(rel, list_make1(rawEnt), NIL,
8687 : false, true, false, NULL);
8688 :
8689 : /* Make above new expression visible */
8690 150 : CommandCounterIncrement();
8691 :
8692 150 : if (rewrite)
8693 : {
8694 : /* Prepare for table rewrite */
8695 78 : defval = (Expr *) build_column_default(rel, attnum);
8696 :
8697 78 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
8698 78 : newval->attnum = attnum;
8699 78 : newval->expr = expression_planner(defval);
8700 78 : newval->is_generated = true;
8701 :
8702 78 : tab->newvals = lappend(tab->newvals, newval);
8703 78 : tab->rewrite |= AT_REWRITE_DEFAULT_VAL;
8704 : }
8705 :
8706 : /* Drop any pg_statistic entry for the column */
8707 150 : RemoveStatistics(RelationGetRelid(rel), attnum);
8708 :
8709 150 : InvokeObjectPostAlterHook(RelationRelationId,
8710 : RelationGetRelid(rel), attnum);
8711 :
8712 150 : ObjectAddressSubSet(address, RelationRelationId,
8713 : RelationGetRelid(rel), attnum);
8714 150 : return address;
8715 : }
8716 :
8717 : /*
8718 : * ALTER TABLE ALTER COLUMN DROP EXPRESSION
8719 : */
8720 : static void
8721 86 : ATPrepDropExpression(Relation rel, AlterTableCmd *cmd, bool recurse, bool recursing, LOCKMODE lockmode)
8722 : {
8723 : /*
8724 : * Reject ONLY if there are child tables. We could implement this, but it
8725 : * is a bit complicated. GENERATED clauses must be attached to the column
8726 : * definition and cannot be added later like DEFAULT, so if a child table
8727 : * has a generation expression that the parent does not have, the child
8728 : * column will necessarily be an attislocal column. So to implement ONLY
8729 : * here, we'd need extra code to update attislocal of the direct child
8730 : * tables, somewhat similar to how DROP COLUMN does it, so that the
8731 : * resulting state can be properly dumped and restored.
8732 : */
8733 110 : if (!recurse &&
8734 24 : find_inheritance_children(RelationGetRelid(rel), lockmode))
8735 12 : ereport(ERROR,
8736 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8737 : errmsg("ALTER TABLE / DROP EXPRESSION must be applied to child tables too")));
8738 :
8739 : /*
8740 : * Cannot drop generation expression from inherited columns.
8741 : */
8742 74 : if (!recursing)
8743 : {
8744 : HeapTuple tuple;
8745 : Form_pg_attribute attTup;
8746 :
8747 62 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), cmd->name);
8748 62 : if (!HeapTupleIsValid(tuple))
8749 0 : ereport(ERROR,
8750 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8751 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8752 : cmd->name, RelationGetRelationName(rel))));
8753 :
8754 62 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8755 :
8756 62 : if (attTup->attinhcount > 0)
8757 12 : ereport(ERROR,
8758 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
8759 : errmsg("cannot drop generation expression from inherited column")));
8760 : }
8761 62 : }
8762 :
8763 : /*
8764 : * Return the address of the affected column.
8765 : */
8766 : static ObjectAddress
8767 56 : ATExecDropExpression(Relation rel, const char *colName, bool missing_ok, LOCKMODE lockmode)
8768 : {
8769 : HeapTuple tuple;
8770 : Form_pg_attribute attTup;
8771 : AttrNumber attnum;
8772 : Relation attrelation;
8773 : Oid attrdefoid;
8774 : ObjectAddress address;
8775 :
8776 56 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8777 56 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
8778 56 : if (!HeapTupleIsValid(tuple))
8779 0 : ereport(ERROR,
8780 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8781 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8782 : colName, RelationGetRelationName(rel))));
8783 :
8784 56 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
8785 56 : attnum = attTup->attnum;
8786 :
8787 56 : if (attnum <= 0)
8788 0 : ereport(ERROR,
8789 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8790 : errmsg("cannot alter system column \"%s\"",
8791 : colName)));
8792 :
8793 : /*
8794 : * TODO: This could be done, but it would need a table rewrite to
8795 : * materialize the generated values. Note that for the time being, we
8796 : * still error with missing_ok, so that we don't silently leave the column
8797 : * as generated.
8798 : */
8799 56 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8800 12 : ereport(ERROR,
8801 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8802 : errmsg("ALTER TABLE / DROP EXPRESSION is not supported for virtual generated columns"),
8803 : errdetail("Column \"%s\" of relation \"%s\" is a virtual generated column.",
8804 : colName, RelationGetRelationName(rel))));
8805 :
8806 44 : if (!attTup->attgenerated)
8807 : {
8808 24 : if (!missing_ok)
8809 12 : ereport(ERROR,
8810 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
8811 : errmsg("column \"%s\" of relation \"%s\" is not a generated column",
8812 : colName, RelationGetRelationName(rel))));
8813 : else
8814 : {
8815 12 : ereport(NOTICE,
8816 : (errmsg("column \"%s\" of relation \"%s\" is not a generated column, skipping",
8817 : colName, RelationGetRelationName(rel))));
8818 12 : heap_freetuple(tuple);
8819 12 : table_close(attrelation, RowExclusiveLock);
8820 12 : return InvalidObjectAddress;
8821 : }
8822 : }
8823 :
8824 : /*
8825 : * Mark the column as no longer generated. (The atthasdef flag needs to
8826 : * get cleared too, but RemoveAttrDefault will handle that.)
8827 : */
8828 20 : attTup->attgenerated = '\0';
8829 20 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
8830 :
8831 20 : InvokeObjectPostAlterHook(RelationRelationId,
8832 : RelationGetRelid(rel),
8833 : attnum);
8834 20 : heap_freetuple(tuple);
8835 :
8836 20 : table_close(attrelation, RowExclusiveLock);
8837 :
8838 : /*
8839 : * Drop the dependency records of the GENERATED expression, in particular
8840 : * its INTERNAL dependency on the column, which would otherwise cause
8841 : * dependency.c to refuse to perform the deletion.
8842 : */
8843 20 : attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
8844 20 : if (!OidIsValid(attrdefoid))
8845 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
8846 : RelationGetRelid(rel), attnum);
8847 20 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
8848 :
8849 : /* Make above changes visible */
8850 20 : CommandCounterIncrement();
8851 :
8852 : /*
8853 : * Get rid of the GENERATED expression itself. We use RESTRICT here for
8854 : * safety, but at present we do not expect anything to depend on the
8855 : * default.
8856 : */
8857 20 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT,
8858 : false, false);
8859 :
8860 20 : ObjectAddressSubSet(address, RelationRelationId,
8861 : RelationGetRelid(rel), attnum);
8862 20 : return address;
8863 : }
8864 :
8865 : /*
8866 : * ALTER TABLE ALTER COLUMN SET STATISTICS
8867 : *
8868 : * Return value is the address of the modified column
8869 : */
8870 : static ObjectAddress
8871 164 : ATExecSetStatistics(Relation rel, const char *colName, int16 colNum, Node *newValue, LOCKMODE lockmode)
8872 : {
8873 164 : int newtarget = 0;
8874 : bool newtarget_default;
8875 : Relation attrelation;
8876 : HeapTuple tuple,
8877 : newtuple;
8878 : Form_pg_attribute attrtuple;
8879 : AttrNumber attnum;
8880 : ObjectAddress address;
8881 : Datum repl_val[Natts_pg_attribute];
8882 : bool repl_null[Natts_pg_attribute];
8883 : bool repl_repl[Natts_pg_attribute];
8884 :
8885 : /*
8886 : * We allow referencing columns by numbers only for indexes, since table
8887 : * column numbers could contain gaps if columns are later dropped.
8888 : */
8889 164 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
8890 100 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX &&
8891 : !colName)
8892 0 : ereport(ERROR,
8893 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8894 : errmsg("cannot refer to non-index column by number")));
8895 :
8896 : /* -1 was used in previous versions for the default setting */
8897 164 : if (newValue && intVal(newValue) != -1)
8898 : {
8899 120 : newtarget = intVal(newValue);
8900 120 : newtarget_default = false;
8901 : }
8902 : else
8903 44 : newtarget_default = true;
8904 :
8905 164 : if (!newtarget_default)
8906 : {
8907 : /*
8908 : * Limit target to a sane range
8909 : */
8910 120 : if (newtarget < 0)
8911 : {
8912 0 : ereport(ERROR,
8913 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
8914 : errmsg("statistics target %d is too low",
8915 : newtarget)));
8916 : }
8917 120 : else if (newtarget > MAX_STATISTICS_TARGET)
8918 : {
8919 0 : newtarget = MAX_STATISTICS_TARGET;
8920 0 : ereport(WARNING,
8921 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
8922 : errmsg("lowering statistics target to %d",
8923 : newtarget)));
8924 : }
8925 : }
8926 :
8927 164 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
8928 :
8929 164 : if (colName)
8930 : {
8931 100 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
8932 :
8933 100 : if (!HeapTupleIsValid(tuple))
8934 12 : ereport(ERROR,
8935 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8936 : errmsg("column \"%s\" of relation \"%s\" does not exist",
8937 : colName, RelationGetRelationName(rel))));
8938 : }
8939 : else
8940 : {
8941 64 : tuple = SearchSysCacheAttNum(RelationGetRelid(rel), colNum);
8942 :
8943 64 : if (!HeapTupleIsValid(tuple))
8944 12 : ereport(ERROR,
8945 : (errcode(ERRCODE_UNDEFINED_COLUMN),
8946 : errmsg("column number %d of relation \"%s\" does not exist",
8947 : colNum, RelationGetRelationName(rel))));
8948 : }
8949 :
8950 140 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
8951 :
8952 140 : attnum = attrtuple->attnum;
8953 140 : if (attnum <= 0)
8954 0 : ereport(ERROR,
8955 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8956 : errmsg("cannot alter system column \"%s\"",
8957 : colName)));
8958 :
8959 : /*
8960 : * Prevent this as long as the ANALYZE code skips virtual generated
8961 : * columns.
8962 : */
8963 140 : if (attrtuple->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
8964 0 : ereport(ERROR,
8965 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8966 : errmsg("cannot alter statistics on virtual generated column \"%s\"",
8967 : colName)));
8968 :
8969 140 : if (rel->rd_rel->relkind == RELKIND_INDEX ||
8970 88 : rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX)
8971 : {
8972 52 : if (attnum > rel->rd_index->indnkeyatts)
8973 6 : ereport(ERROR,
8974 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8975 : errmsg("cannot alter statistics on included column \"%s\" of index \"%s\"",
8976 : NameStr(attrtuple->attname), RelationGetRelationName(rel))));
8977 46 : else if (rel->rd_index->indkey.values[attnum - 1] != 0)
8978 18 : ereport(ERROR,
8979 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
8980 : errmsg("cannot alter statistics on non-expression column \"%s\" of index \"%s\"",
8981 : NameStr(attrtuple->attname), RelationGetRelationName(rel)),
8982 : errhint("Alter statistics on table column instead.")));
8983 : }
8984 :
8985 : /* Build new tuple. */
8986 116 : memset(repl_null, false, sizeof(repl_null));
8987 116 : memset(repl_repl, false, sizeof(repl_repl));
8988 116 : if (!newtarget_default)
8989 72 : repl_val[Anum_pg_attribute_attstattarget - 1] = newtarget;
8990 : else
8991 44 : repl_null[Anum_pg_attribute_attstattarget - 1] = true;
8992 116 : repl_repl[Anum_pg_attribute_attstattarget - 1] = true;
8993 116 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
8994 : repl_val, repl_null, repl_repl);
8995 116 : CatalogTupleUpdate(attrelation, &tuple->t_self, newtuple);
8996 :
8997 116 : InvokeObjectPostAlterHook(RelationRelationId,
8998 : RelationGetRelid(rel),
8999 : attrtuple->attnum);
9000 116 : ObjectAddressSubSet(address, RelationRelationId,
9001 : RelationGetRelid(rel), attnum);
9002 :
9003 116 : heap_freetuple(newtuple);
9004 :
9005 116 : ReleaseSysCache(tuple);
9006 :
9007 116 : table_close(attrelation, RowExclusiveLock);
9008 :
9009 116 : return address;
9010 : }
9011 :
9012 : /*
9013 : * Return value is the address of the modified column
9014 : */
9015 : static ObjectAddress
9016 32 : ATExecSetOptions(Relation rel, const char *colName, Node *options,
9017 : bool isReset, LOCKMODE lockmode)
9018 : {
9019 : Relation attrelation;
9020 : HeapTuple tuple,
9021 : newtuple;
9022 : Form_pg_attribute attrtuple;
9023 : AttrNumber attnum;
9024 : Datum datum,
9025 : newOptions;
9026 : bool isnull;
9027 : ObjectAddress address;
9028 : Datum repl_val[Natts_pg_attribute];
9029 : bool repl_null[Natts_pg_attribute];
9030 : bool repl_repl[Natts_pg_attribute];
9031 :
9032 32 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9033 :
9034 32 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9035 :
9036 32 : if (!HeapTupleIsValid(tuple))
9037 0 : ereport(ERROR,
9038 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9039 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9040 : colName, RelationGetRelationName(rel))));
9041 32 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9042 :
9043 32 : attnum = attrtuple->attnum;
9044 32 : if (attnum <= 0)
9045 0 : ereport(ERROR,
9046 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9047 : errmsg("cannot alter system column \"%s\"",
9048 : colName)));
9049 :
9050 : /* Generate new proposed attoptions (text array) */
9051 32 : datum = SysCacheGetAttr(ATTNAME, tuple, Anum_pg_attribute_attoptions,
9052 : &isnull);
9053 32 : newOptions = transformRelOptions(isnull ? (Datum) 0 : datum,
9054 : castNode(List, options), NULL, NULL,
9055 : false, isReset);
9056 : /* Validate new options */
9057 32 : (void) attribute_reloptions(newOptions, true);
9058 :
9059 : /* Build new tuple. */
9060 32 : memset(repl_null, false, sizeof(repl_null));
9061 32 : memset(repl_repl, false, sizeof(repl_repl));
9062 32 : if (newOptions != (Datum) 0)
9063 32 : repl_val[Anum_pg_attribute_attoptions - 1] = newOptions;
9064 : else
9065 0 : repl_null[Anum_pg_attribute_attoptions - 1] = true;
9066 32 : repl_repl[Anum_pg_attribute_attoptions - 1] = true;
9067 32 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrelation),
9068 : repl_val, repl_null, repl_repl);
9069 :
9070 : /* Update system catalog. */
9071 32 : CatalogTupleUpdate(attrelation, &newtuple->t_self, newtuple);
9072 :
9073 32 : InvokeObjectPostAlterHook(RelationRelationId,
9074 : RelationGetRelid(rel),
9075 : attrtuple->attnum);
9076 32 : ObjectAddressSubSet(address, RelationRelationId,
9077 : RelationGetRelid(rel), attnum);
9078 :
9079 32 : heap_freetuple(newtuple);
9080 :
9081 32 : ReleaseSysCache(tuple);
9082 :
9083 32 : table_close(attrelation, RowExclusiveLock);
9084 :
9085 32 : return address;
9086 : }
9087 :
9088 : /*
9089 : * Helper function for ATExecSetStorage and ATExecSetCompression
9090 : *
9091 : * Set the attstorage and/or attcompression fields for index columns
9092 : * associated with the specified table column.
9093 : */
9094 : static void
9095 318 : SetIndexStorageProperties(Relation rel, Relation attrelation,
9096 : AttrNumber attnum,
9097 : bool setstorage, char newstorage,
9098 : bool setcompression, char newcompression,
9099 : LOCKMODE lockmode)
9100 : {
9101 : ListCell *lc;
9102 :
9103 402 : foreach(lc, RelationGetIndexList(rel))
9104 : {
9105 84 : Oid indexoid = lfirst_oid(lc);
9106 : Relation indrel;
9107 84 : AttrNumber indattnum = 0;
9108 : HeapTuple tuple;
9109 :
9110 84 : indrel = index_open(indexoid, lockmode);
9111 :
9112 144 : for (int i = 0; i < indrel->rd_index->indnatts; i++)
9113 : {
9114 90 : if (indrel->rd_index->indkey.values[i] == attnum)
9115 : {
9116 30 : indattnum = i + 1;
9117 30 : break;
9118 : }
9119 : }
9120 :
9121 84 : if (indattnum == 0)
9122 : {
9123 54 : index_close(indrel, lockmode);
9124 54 : continue;
9125 : }
9126 :
9127 30 : tuple = SearchSysCacheCopyAttNum(RelationGetRelid(indrel), indattnum);
9128 :
9129 30 : if (HeapTupleIsValid(tuple))
9130 : {
9131 30 : Form_pg_attribute attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9132 :
9133 30 : if (setstorage)
9134 24 : attrtuple->attstorage = newstorage;
9135 :
9136 30 : if (setcompression)
9137 6 : attrtuple->attcompression = newcompression;
9138 :
9139 30 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9140 :
9141 30 : InvokeObjectPostAlterHook(RelationRelationId,
9142 : RelationGetRelid(rel),
9143 : attrtuple->attnum);
9144 :
9145 30 : heap_freetuple(tuple);
9146 : }
9147 :
9148 30 : index_close(indrel, lockmode);
9149 : }
9150 318 : }
9151 :
9152 : /*
9153 : * ALTER TABLE ALTER COLUMN SET STORAGE
9154 : *
9155 : * Return value is the address of the modified column
9156 : */
9157 : static ObjectAddress
9158 246 : ATExecSetStorage(Relation rel, const char *colName, Node *newValue, LOCKMODE lockmode)
9159 : {
9160 : Relation attrelation;
9161 : HeapTuple tuple;
9162 : Form_pg_attribute attrtuple;
9163 : AttrNumber attnum;
9164 : ObjectAddress address;
9165 :
9166 246 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
9167 :
9168 246 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
9169 :
9170 246 : if (!HeapTupleIsValid(tuple))
9171 12 : ereport(ERROR,
9172 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9173 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9174 : colName, RelationGetRelationName(rel))));
9175 234 : attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);
9176 :
9177 234 : attnum = attrtuple->attnum;
9178 234 : if (attnum <= 0)
9179 0 : ereport(ERROR,
9180 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9181 : errmsg("cannot alter system column \"%s\"",
9182 : colName)));
9183 :
9184 234 : attrtuple->attstorage = GetAttributeStorage(attrtuple->atttypid, strVal(newValue));
9185 :
9186 234 : CatalogTupleUpdate(attrelation, &tuple->t_self, tuple);
9187 :
9188 234 : InvokeObjectPostAlterHook(RelationRelationId,
9189 : RelationGetRelid(rel),
9190 : attrtuple->attnum);
9191 :
9192 : /*
9193 : * Apply the change to indexes as well (only for simple index columns,
9194 : * matching behavior of index.c ConstructTupleDescriptor()).
9195 : */
9196 234 : SetIndexStorageProperties(rel, attrelation, attnum,
9197 234 : true, attrtuple->attstorage,
9198 : false, 0,
9199 : lockmode);
9200 :
9201 234 : heap_freetuple(tuple);
9202 :
9203 234 : table_close(attrelation, RowExclusiveLock);
9204 :
9205 234 : ObjectAddressSubSet(address, RelationRelationId,
9206 : RelationGetRelid(rel), attnum);
9207 234 : return address;
9208 : }
9209 :
9210 :
9211 : /*
9212 : * ALTER TABLE DROP COLUMN
9213 : *
9214 : * DROP COLUMN cannot use the normal ALTER TABLE recursion mechanism,
9215 : * because we have to decide at runtime whether to recurse or not depending
9216 : * on whether attinhcount goes to zero or not. (We can't check this in a
9217 : * static pre-pass because it won't handle multiple inheritance situations
9218 : * correctly.)
9219 : */
9220 : static void
9221 1652 : ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
9222 : AlterTableCmd *cmd, LOCKMODE lockmode,
9223 : AlterTableUtilityContext *context)
9224 : {
9225 1652 : if (rel->rd_rel->reloftype && !recursing)
9226 6 : ereport(ERROR,
9227 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
9228 : errmsg("cannot drop column from typed table")));
9229 :
9230 1646 : if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
9231 84 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
9232 :
9233 1640 : if (recurse)
9234 1360 : cmd->recurse = true;
9235 1640 : }
9236 :
9237 : /*
9238 : * Drops column 'colName' from relation 'rel' and returns the address of the
9239 : * dropped column. The column is also dropped (or marked as no longer
9240 : * inherited from relation) from the relation's inheritance children, if any.
9241 : *
9242 : * In the recursive invocations for inheritance child relations, instead of
9243 : * dropping the column directly (if to be dropped at all), its object address
9244 : * is added to 'addrs', which must be non-NULL in such invocations. All
9245 : * columns are dropped at the same time after all the children have been
9246 : * checked recursively.
9247 : */
9248 : static ObjectAddress
9249 2196 : ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
9250 : DropBehavior behavior,
9251 : bool recurse, bool recursing,
9252 : bool missing_ok, LOCKMODE lockmode,
9253 : ObjectAddresses *addrs)
9254 : {
9255 : HeapTuple tuple;
9256 : Form_pg_attribute targetatt;
9257 : AttrNumber attnum;
9258 : List *children;
9259 : ObjectAddress object;
9260 : bool is_expr;
9261 :
9262 : /* At top level, permission check was done in ATPrepCmd, else do it */
9263 2196 : if (recursing)
9264 556 : ATSimplePermissions(AT_DropColumn, rel,
9265 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9266 :
9267 : /* Initialize addrs on the first invocation */
9268 : Assert(!recursing || addrs != NULL);
9269 :
9270 : /* since this function recurses, it could be driven to stack overflow */
9271 2196 : check_stack_depth();
9272 :
9273 2196 : if (!recursing)
9274 1640 : addrs = new_object_addresses();
9275 :
9276 : /*
9277 : * get the number of the attribute
9278 : */
9279 2196 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
9280 2196 : if (!HeapTupleIsValid(tuple))
9281 : {
9282 54 : if (!missing_ok)
9283 : {
9284 36 : ereport(ERROR,
9285 : (errcode(ERRCODE_UNDEFINED_COLUMN),
9286 : errmsg("column \"%s\" of relation \"%s\" does not exist",
9287 : colName, RelationGetRelationName(rel))));
9288 : }
9289 : else
9290 : {
9291 18 : ereport(NOTICE,
9292 : (errmsg("column \"%s\" of relation \"%s\" does not exist, skipping",
9293 : colName, RelationGetRelationName(rel))));
9294 18 : return InvalidObjectAddress;
9295 : }
9296 : }
9297 2142 : targetatt = (Form_pg_attribute) GETSTRUCT(tuple);
9298 :
9299 2142 : attnum = targetatt->attnum;
9300 :
9301 : /* Can't drop a system attribute */
9302 2142 : if (attnum <= 0)
9303 6 : ereport(ERROR,
9304 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9305 : errmsg("cannot drop system column \"%s\"",
9306 : colName)));
9307 :
9308 : /*
9309 : * Don't drop inherited columns, unless recursing (presumably from a drop
9310 : * of the parent column)
9311 : */
9312 2136 : if (targetatt->attinhcount > 0 && !recursing)
9313 48 : ereport(ERROR,
9314 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9315 : errmsg("cannot drop inherited column \"%s\"",
9316 : colName)));
9317 :
9318 : /*
9319 : * Don't drop columns used in the partition key, either. (If we let this
9320 : * go through, the key column's dependencies would cause a cascaded drop
9321 : * of the whole table, which is surely not what the user expected.)
9322 : */
9323 2088 : if (has_partition_attrs(rel,
9324 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
9325 : &is_expr))
9326 30 : ereport(ERROR,
9327 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9328 : errmsg("cannot drop column \"%s\" because it is part of the partition key of relation \"%s\"",
9329 : colName, RelationGetRelationName(rel))));
9330 :
9331 2058 : ReleaseSysCache(tuple);
9332 :
9333 : /*
9334 : * Propagate to children as appropriate. Unlike most other ALTER
9335 : * routines, we have to do this one level of recursion at a time; we can't
9336 : * use find_all_inheritors to do it in one pass.
9337 : */
9338 : children =
9339 2058 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9340 :
9341 2058 : if (children)
9342 : {
9343 : Relation attr_rel;
9344 : ListCell *child;
9345 :
9346 : /*
9347 : * In case of a partitioned table, the column must be dropped from the
9348 : * partitions as well.
9349 : */
9350 302 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
9351 6 : ereport(ERROR,
9352 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9353 : errmsg("cannot drop column from only the partitioned table when partitions exist"),
9354 : errhint("Do not specify the ONLY keyword.")));
9355 :
9356 296 : attr_rel = table_open(AttributeRelationId, RowExclusiveLock);
9357 882 : foreach(child, children)
9358 : {
9359 592 : Oid childrelid = lfirst_oid(child);
9360 : Relation childrel;
9361 : Form_pg_attribute childatt;
9362 :
9363 : /* find_inheritance_children already got lock */
9364 592 : childrel = table_open(childrelid, NoLock);
9365 592 : CheckAlterTableIsSafe(childrel);
9366 :
9367 592 : tuple = SearchSysCacheCopyAttName(childrelid, colName);
9368 592 : if (!HeapTupleIsValid(tuple)) /* shouldn't happen */
9369 0 : elog(ERROR, "cache lookup failed for attribute \"%s\" of relation %u",
9370 : colName, childrelid);
9371 592 : childatt = (Form_pg_attribute) GETSTRUCT(tuple);
9372 :
9373 592 : if (childatt->attinhcount <= 0) /* shouldn't happen */
9374 0 : elog(ERROR, "relation %u has non-inherited attribute \"%s\"",
9375 : childrelid, colName);
9376 :
9377 592 : if (recurse)
9378 : {
9379 : /*
9380 : * If the child column has other definition sources, just
9381 : * decrement its inheritance count; if not, recurse to delete
9382 : * it.
9383 : */
9384 568 : if (childatt->attinhcount == 1 && !childatt->attislocal)
9385 : {
9386 : /* Time to delete this child column, too */
9387 556 : ATExecDropColumn(wqueue, childrel, colName,
9388 : behavior, true, true,
9389 : false, lockmode, addrs);
9390 : }
9391 : else
9392 : {
9393 : /* Child column must survive my deletion */
9394 12 : childatt->attinhcount--;
9395 :
9396 12 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9397 :
9398 : /* Make update visible */
9399 12 : CommandCounterIncrement();
9400 : }
9401 : }
9402 : else
9403 : {
9404 : /*
9405 : * If we were told to drop ONLY in this table (no recursion),
9406 : * we need to mark the inheritors' attributes as locally
9407 : * defined rather than inherited.
9408 : */
9409 24 : childatt->attinhcount--;
9410 24 : childatt->attislocal = true;
9411 :
9412 24 : CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
9413 :
9414 : /* Make update visible */
9415 24 : CommandCounterIncrement();
9416 : }
9417 :
9418 586 : heap_freetuple(tuple);
9419 :
9420 586 : table_close(childrel, NoLock);
9421 : }
9422 290 : table_close(attr_rel, RowExclusiveLock);
9423 : }
9424 :
9425 : /* Add object to delete */
9426 2046 : object.classId = RelationRelationId;
9427 2046 : object.objectId = RelationGetRelid(rel);
9428 2046 : object.objectSubId = attnum;
9429 2046 : add_exact_object_address(&object, addrs);
9430 :
9431 2046 : if (!recursing)
9432 : {
9433 : /* Recursion has ended, drop everything that was collected */
9434 1496 : performMultipleDeletions(addrs, behavior, 0);
9435 1442 : free_object_addresses(addrs);
9436 : }
9437 :
9438 1992 : return object;
9439 : }
9440 :
9441 : /*
9442 : * Prepare to add a primary key on a table, by adding not-null constraints
9443 : * on all columns.
9444 : *
9445 : * The not-null constraints for a primary key must cover the whole inheritance
9446 : * hierarchy (failing to ensure that leads to funny corner cases). For the
9447 : * normal case where we're asked to recurse, this routine checks if the
9448 : * not-null constraints exist already, and if not queues a requirement for
9449 : * them to be created by phase 2.
9450 : *
9451 : * For the case where we're asked not to recurse, we verify that a not-null
9452 : * constraint exists on each column of each (direct) child table, throwing an
9453 : * error if not. Not throwing an error would also work, because a not-null
9454 : * constraint would be created anyway, but it'd cause a silent scan of the
9455 : * child table to verify absence of nulls. We prefer to let the user know so
9456 : * that they can add the constraint manually without having to hold
9457 : * AccessExclusiveLock while at it.
9458 : *
9459 : * However, it's also important that we do not acquire locks on children if
9460 : * the not-null constraints already exist on the parent, to avoid risking
9461 : * deadlocks during parallel pg_restore of PKs on partitioned tables.
9462 : */
9463 : static void
9464 16082 : ATPrepAddPrimaryKey(List **wqueue, Relation rel, AlterTableCmd *cmd,
9465 : bool recurse, LOCKMODE lockmode,
9466 : AlterTableUtilityContext *context)
9467 : {
9468 : Constraint *pkconstr;
9469 16082 : List *children = NIL;
9470 16082 : bool got_children = false;
9471 :
9472 16082 : pkconstr = castNode(Constraint, cmd->def);
9473 16082 : if (pkconstr->contype != CONSTR_PRIMARY)
9474 9112 : return;
9475 :
9476 : /* Verify that columns are not-null, or request that they be made so */
9477 15196 : foreach_node(String, column, pkconstr->keys)
9478 : {
9479 : AlterTableCmd *newcmd;
9480 : Constraint *nnconstr;
9481 : HeapTuple tuple;
9482 :
9483 : /*
9484 : * First check if a suitable constraint exists. If it does, we don't
9485 : * need to request another one. We do need to bail out if it's not
9486 : * valid, though.
9487 : */
9488 1316 : tuple = findNotNullConstraint(RelationGetRelid(rel), strVal(column));
9489 1316 : if (tuple != NULL)
9490 : {
9491 806 : verifyNotNullPKCompatible(tuple, strVal(column));
9492 :
9493 : /* All good with this one; don't request another */
9494 794 : heap_freetuple(tuple);
9495 794 : continue;
9496 : }
9497 510 : else if (!recurse)
9498 : {
9499 : /*
9500 : * No constraint on this column. Asked not to recurse, we won't
9501 : * create one here, but verify that all children have one.
9502 : */
9503 36 : if (!got_children)
9504 : {
9505 36 : children = find_inheritance_children(RelationGetRelid(rel),
9506 : lockmode);
9507 : /* only search for children on the first time through */
9508 36 : got_children = true;
9509 : }
9510 :
9511 72 : foreach_oid(childrelid, children)
9512 : {
9513 : HeapTuple tup;
9514 :
9515 36 : tup = findNotNullConstraint(childrelid, strVal(column));
9516 36 : if (!tup)
9517 6 : ereport(ERROR,
9518 : errmsg("column \"%s\" of table \"%s\" is not marked NOT NULL",
9519 : strVal(column), get_rel_name(childrelid)));
9520 : /* verify it's good enough */
9521 30 : verifyNotNullPKCompatible(tup, strVal(column));
9522 : }
9523 : }
9524 :
9525 : /* This column is not already not-null, so add it to the queue */
9526 492 : nnconstr = makeNotNullConstraint(column);
9527 :
9528 492 : newcmd = makeNode(AlterTableCmd);
9529 492 : newcmd->subtype = AT_AddConstraint;
9530 : /* note we force recurse=true here; see above */
9531 492 : newcmd->recurse = true;
9532 492 : newcmd->def = (Node *) nnconstr;
9533 :
9534 492 : ATPrepCmd(wqueue, rel, newcmd, true, false, lockmode, context);
9535 : }
9536 : }
9537 :
9538 : /*
9539 : * Verify whether the given not-null constraint is compatible with a
9540 : * primary key. If not, an error is thrown.
9541 : */
9542 : static void
9543 836 : verifyNotNullPKCompatible(HeapTuple tuple, const char *colname)
9544 : {
9545 836 : Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
9546 :
9547 836 : if (conForm->contype != CONSTRAINT_NOTNULL)
9548 0 : elog(ERROR, "constraint %u is not a not-null constraint", conForm->oid);
9549 :
9550 : /* a NO INHERIT constraint is no good */
9551 836 : if (conForm->connoinherit)
9552 12 : ereport(ERROR,
9553 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9554 : errmsg("cannot create primary key on column \"%s\"", colname),
9555 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9556 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9557 : NameStr(conForm->conname), colname,
9558 : get_rel_name(conForm->conrelid), "NO INHERIT"),
9559 : errhint("You might need to make the existing constraint inheritable using %s.",
9560 : "ALTER TABLE ... ALTER CONSTRAINT ... INHERIT"));
9561 :
9562 : /* an unvalidated constraint is no good */
9563 824 : if (!conForm->convalidated)
9564 12 : ereport(ERROR,
9565 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
9566 : errmsg("cannot create primary key on column \"%s\"", colname),
9567 : /*- translator: fourth %s is a constraint characteristic such as NOT VALID */
9568 : errdetail("The constraint \"%s\" on column \"%s\" of table \"%s\", marked %s, is incompatible with a primary key.",
9569 : NameStr(conForm->conname), colname,
9570 : get_rel_name(conForm->conrelid), "NOT VALID"),
9571 : errhint("You might need to validate it using %s.",
9572 : "ALTER TABLE ... VALIDATE CONSTRAINT"));
9573 812 : }
9574 :
9575 : /*
9576 : * ALTER TABLE ADD INDEX
9577 : *
9578 : * There is no such command in the grammar, but parse_utilcmd.c converts
9579 : * UNIQUE and PRIMARY KEY constraints into AT_AddIndex subcommands. This lets
9580 : * us schedule creation of the index at the appropriate time during ALTER.
9581 : *
9582 : * Return value is the address of the new index.
9583 : */
9584 : static ObjectAddress
9585 1898 : ATExecAddIndex(AlteredTableInfo *tab, Relation rel,
9586 : IndexStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9587 : {
9588 : bool check_rights;
9589 : bool skip_build;
9590 : bool quiet;
9591 : ObjectAddress address;
9592 :
9593 : Assert(IsA(stmt, IndexStmt));
9594 : Assert(!stmt->concurrent);
9595 :
9596 : /* The IndexStmt has already been through transformIndexStmt */
9597 : Assert(stmt->transformed);
9598 :
9599 : /* suppress schema rights check when rebuilding existing index */
9600 1898 : check_rights = !is_rebuild;
9601 : /* skip index build if phase 3 will do it or we're reusing an old one */
9602 1898 : skip_build = tab->rewrite > 0 || RelFileNumberIsValid(stmt->oldNumber);
9603 : /* suppress notices when rebuilding existing index */
9604 1898 : quiet = is_rebuild;
9605 :
9606 1898 : address = DefineIndex(RelationGetRelid(rel),
9607 : stmt,
9608 : InvalidOid, /* no predefined OID */
9609 : InvalidOid, /* no parent index */
9610 : InvalidOid, /* no parent constraint */
9611 : -1, /* total_parts unknown */
9612 : true, /* is_alter_table */
9613 : check_rights,
9614 : false, /* check_not_in_use - we did it already */
9615 : skip_build,
9616 : quiet);
9617 :
9618 : /*
9619 : * If TryReuseIndex() stashed a relfilenumber for us, we used it for the
9620 : * new index instead of building from scratch. Restore associated fields.
9621 : * This may store InvalidSubTransactionId in both fields, in which case
9622 : * relcache.c will assume it can rebuild the relcache entry. Hence, do
9623 : * this after the CCI that made catalog rows visible to any rebuild. The
9624 : * DROP of the old edition of this index will have scheduled the storage
9625 : * for deletion at commit, so cancel that pending deletion.
9626 : */
9627 1728 : if (RelFileNumberIsValid(stmt->oldNumber))
9628 : {
9629 74 : Relation irel = index_open(address.objectId, NoLock);
9630 :
9631 74 : irel->rd_createSubid = stmt->oldCreateSubid;
9632 74 : irel->rd_firstRelfilelocatorSubid = stmt->oldFirstRelfilelocatorSubid;
9633 74 : RelationPreserveStorage(irel->rd_locator, true);
9634 74 : index_close(irel, NoLock);
9635 : }
9636 :
9637 1728 : return address;
9638 : }
9639 :
9640 : /*
9641 : * ALTER TABLE ADD STATISTICS
9642 : *
9643 : * This is no such command in the grammar, but we use this internally to add
9644 : * AT_ReAddStatistics subcommands to rebuild extended statistics after a table
9645 : * column type change.
9646 : */
9647 : static ObjectAddress
9648 14 : ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
9649 : CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
9650 : {
9651 : ObjectAddress address;
9652 :
9653 : Assert(IsA(stmt, CreateStatsStmt));
9654 :
9655 : /* The CreateStatsStmt has already been through transformStatsStmt */
9656 : Assert(stmt->transformed);
9657 :
9658 14 : address = CreateStatistics(stmt);
9659 :
9660 14 : return address;
9661 : }
9662 :
9663 : /*
9664 : * ALTER TABLE ADD CONSTRAINT USING INDEX
9665 : *
9666 : * Returns the address of the new constraint.
9667 : */
9668 : static ObjectAddress
9669 10420 : ATExecAddIndexConstraint(AlteredTableInfo *tab, Relation rel,
9670 : IndexStmt *stmt, LOCKMODE lockmode)
9671 : {
9672 10420 : Oid index_oid = stmt->indexOid;
9673 : Relation indexRel;
9674 : char *indexName;
9675 : IndexInfo *indexInfo;
9676 : char *constraintName;
9677 : char constraintType;
9678 : ObjectAddress address;
9679 : bits16 flags;
9680 :
9681 : Assert(IsA(stmt, IndexStmt));
9682 : Assert(OidIsValid(index_oid));
9683 : Assert(stmt->isconstraint);
9684 :
9685 : /*
9686 : * Doing this on partitioned tables is not a simple feature to implement,
9687 : * so let's punt for now.
9688 : */
9689 10420 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
9690 6 : ereport(ERROR,
9691 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
9692 : errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX is not supported on partitioned tables")));
9693 :
9694 10414 : indexRel = index_open(index_oid, AccessShareLock);
9695 :
9696 10414 : indexName = pstrdup(RelationGetRelationName(indexRel));
9697 :
9698 10414 : indexInfo = BuildIndexInfo(indexRel);
9699 :
9700 : /* this should have been checked at parse time */
9701 10414 : if (!indexInfo->ii_Unique)
9702 0 : elog(ERROR, "index \"%s\" is not unique", indexName);
9703 :
9704 : /*
9705 : * Determine name to assign to constraint. We require a constraint to
9706 : * have the same name as the underlying index; therefore, use the index's
9707 : * existing name as the default constraint name, and if the user
9708 : * explicitly gives some other name for the constraint, rename the index
9709 : * to match.
9710 : */
9711 10414 : constraintName = stmt->idxname;
9712 10414 : if (constraintName == NULL)
9713 10388 : constraintName = indexName;
9714 26 : else if (strcmp(constraintName, indexName) != 0)
9715 : {
9716 20 : ereport(NOTICE,
9717 : (errmsg("ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index \"%s\" to \"%s\"",
9718 : indexName, constraintName)));
9719 20 : RenameRelationInternal(index_oid, constraintName, false, true);
9720 : }
9721 :
9722 : /* Extra checks needed if making primary key */
9723 10414 : if (stmt->primary)
9724 5882 : index_check_primary_key(rel, indexInfo, true, stmt);
9725 :
9726 : /* Note we currently don't support EXCLUSION constraints here */
9727 10408 : if (stmt->primary)
9728 5876 : constraintType = CONSTRAINT_PRIMARY;
9729 : else
9730 4532 : constraintType = CONSTRAINT_UNIQUE;
9731 :
9732 : /* Create the catalog entries for the constraint */
9733 10408 : flags = INDEX_CONSTR_CREATE_UPDATE_INDEX |
9734 : INDEX_CONSTR_CREATE_REMOVE_OLD_DEPS |
9735 20816 : (stmt->initdeferred ? INDEX_CONSTR_CREATE_INIT_DEFERRED : 0) |
9736 10408 : (stmt->deferrable ? INDEX_CONSTR_CREATE_DEFERRABLE : 0) |
9737 10408 : (stmt->primary ? INDEX_CONSTR_CREATE_MARK_AS_PRIMARY : 0);
9738 :
9739 10408 : address = index_constraint_create(rel,
9740 : index_oid,
9741 : InvalidOid,
9742 : indexInfo,
9743 : constraintName,
9744 : constraintType,
9745 : flags,
9746 : allowSystemTableMods,
9747 : false); /* is_internal */
9748 :
9749 10408 : index_close(indexRel, NoLock);
9750 :
9751 10408 : return address;
9752 : }
9753 :
9754 : /*
9755 : * ALTER TABLE ADD CONSTRAINT
9756 : *
9757 : * Return value is the address of the new constraint; if no constraint was
9758 : * added, InvalidObjectAddress is returned.
9759 : */
9760 : static ObjectAddress
9761 12620 : ATExecAddConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9762 : Constraint *newConstraint, bool recurse, bool is_readd,
9763 : LOCKMODE lockmode)
9764 : {
9765 12620 : ObjectAddress address = InvalidObjectAddress;
9766 :
9767 : Assert(IsA(newConstraint, Constraint));
9768 :
9769 : /*
9770 : * Currently, we only expect to see CONSTR_CHECK, CONSTR_NOTNULL and
9771 : * CONSTR_FOREIGN nodes arriving here (see the preprocessing done in
9772 : * parse_utilcmd.c).
9773 : */
9774 12620 : switch (newConstraint->contype)
9775 : {
9776 9982 : case CONSTR_CHECK:
9777 : case CONSTR_NOTNULL:
9778 : address =
9779 9982 : ATAddCheckNNConstraint(wqueue, tab, rel,
9780 : newConstraint, recurse, false, is_readd,
9781 : lockmode);
9782 9838 : break;
9783 :
9784 2638 : case CONSTR_FOREIGN:
9785 :
9786 : /*
9787 : * Assign or validate constraint name
9788 : */
9789 2638 : if (newConstraint->conname)
9790 : {
9791 1220 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
9792 : RelationGetRelid(rel),
9793 1220 : newConstraint->conname))
9794 0 : ereport(ERROR,
9795 : (errcode(ERRCODE_DUPLICATE_OBJECT),
9796 : errmsg("constraint \"%s\" for relation \"%s\" already exists",
9797 : newConstraint->conname,
9798 : RelationGetRelationName(rel))));
9799 : }
9800 : else
9801 1418 : newConstraint->conname =
9802 1418 : ChooseConstraintName(RelationGetRelationName(rel),
9803 1418 : ChooseForeignKeyConstraintNameAddition(newConstraint->fk_attrs),
9804 : "fkey",
9805 1418 : RelationGetNamespace(rel),
9806 : NIL);
9807 :
9808 2638 : address = ATAddForeignKeyConstraint(wqueue, tab, rel,
9809 : newConstraint,
9810 : recurse, false,
9811 : lockmode);
9812 2090 : break;
9813 :
9814 0 : default:
9815 0 : elog(ERROR, "unrecognized constraint type: %d",
9816 : (int) newConstraint->contype);
9817 : }
9818 :
9819 11928 : return address;
9820 : }
9821 :
9822 : /*
9823 : * Generate the column-name portion of the constraint name for a new foreign
9824 : * key given the list of column names that reference the referenced
9825 : * table. This will be passed to ChooseConstraintName along with the parent
9826 : * table name and the "fkey" suffix.
9827 : *
9828 : * We know that less than NAMEDATALEN characters will actually be used, so we
9829 : * can truncate the result once we've generated that many.
9830 : *
9831 : * XXX see also ChooseExtendedStatisticNameAddition and
9832 : * ChooseIndexNameAddition.
9833 : */
9834 : static char *
9835 1418 : ChooseForeignKeyConstraintNameAddition(List *colnames)
9836 : {
9837 : char buf[NAMEDATALEN * 2];
9838 1418 : int buflen = 0;
9839 : ListCell *lc;
9840 :
9841 1418 : buf[0] = '\0';
9842 3234 : foreach(lc, colnames)
9843 : {
9844 1816 : const char *name = strVal(lfirst(lc));
9845 :
9846 1816 : if (buflen > 0)
9847 398 : buf[buflen++] = '_'; /* insert _ between names */
9848 :
9849 : /*
9850 : * At this point we have buflen <= NAMEDATALEN. name should be less
9851 : * than NAMEDATALEN already, but use strlcpy for paranoia.
9852 : */
9853 1816 : strlcpy(buf + buflen, name, NAMEDATALEN);
9854 1816 : buflen += strlen(buf + buflen);
9855 1816 : if (buflen >= NAMEDATALEN)
9856 0 : break;
9857 : }
9858 1418 : return pstrdup(buf);
9859 : }
9860 :
9861 : /*
9862 : * Add a check or not-null constraint to a single table and its children.
9863 : * Returns the address of the constraint added to the parent relation,
9864 : * if one gets added, or InvalidObjectAddress otherwise.
9865 : *
9866 : * Subroutine for ATExecAddConstraint.
9867 : *
9868 : * We must recurse to child tables during execution, rather than using
9869 : * ALTER TABLE's normal prep-time recursion. The reason is that all the
9870 : * constraints *must* be given the same name, else they won't be seen as
9871 : * related later. If the user didn't explicitly specify a name, then
9872 : * AddRelationNewConstraints would normally assign different names to the
9873 : * child constraints. To fix that, we must capture the name assigned at
9874 : * the parent table and pass that down.
9875 : */
9876 : static ObjectAddress
9877 10934 : ATAddCheckNNConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
9878 : Constraint *constr, bool recurse, bool recursing,
9879 : bool is_readd, LOCKMODE lockmode)
9880 : {
9881 : List *newcons;
9882 : ListCell *lcon;
9883 : List *children;
9884 : ListCell *child;
9885 10934 : ObjectAddress address = InvalidObjectAddress;
9886 :
9887 : /* Guard against stack overflow due to overly deep inheritance tree. */
9888 10934 : check_stack_depth();
9889 :
9890 : /* At top level, permission check was done in ATPrepCmd, else do it */
9891 10934 : if (recursing)
9892 818 : ATSimplePermissions(AT_AddConstraint, rel,
9893 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
9894 :
9895 : /*
9896 : * Call AddRelationNewConstraints to do the work, making sure it works on
9897 : * a copy of the Constraint so transformExpr can't modify the original. It
9898 : * returns a list of cooked constraints.
9899 : *
9900 : * If the constraint ends up getting merged with a pre-existing one, it's
9901 : * omitted from the returned list, which is what we want: we do not need
9902 : * to do any validation work. That can only happen at child tables,
9903 : * though, since we disallow merging at the top level.
9904 : */
9905 10934 : newcons = AddRelationNewConstraints(rel, NIL,
9906 10934 : list_make1(copyObject(constr)),
9907 10934 : recursing || is_readd, /* allow_merge */
9908 10934 : !recursing, /* is_local */
9909 : is_readd, /* is_internal */
9910 10934 : NULL); /* queryString not available
9911 : * here */
9912 :
9913 : /* we don't expect more than one constraint here */
9914 : Assert(list_length(newcons) <= 1);
9915 :
9916 : /* Add each to-be-validated constraint to Phase 3's queue */
9917 21382 : foreach(lcon, newcons)
9918 : {
9919 10586 : CookedConstraint *ccon = (CookedConstraint *) lfirst(lcon);
9920 :
9921 10586 : if (!ccon->skip_validation && ccon->contype != CONSTR_NOTNULL)
9922 : {
9923 : NewConstraint *newcon;
9924 :
9925 882 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
9926 882 : newcon->name = ccon->name;
9927 882 : newcon->contype = ccon->contype;
9928 882 : newcon->qual = ccon->expr;
9929 :
9930 882 : tab->constraints = lappend(tab->constraints, newcon);
9931 : }
9932 :
9933 : /* Save the actually assigned name if it was defaulted */
9934 10586 : if (constr->conname == NULL)
9935 8868 : constr->conname = ccon->name;
9936 :
9937 : /*
9938 : * If adding a valid not-null constraint, set the pg_attribute flag
9939 : * and tell phase 3 to verify existing rows, if needed. For an
9940 : * invalid constraint, just set attnotnull, without queueing
9941 : * verification.
9942 : */
9943 10586 : if (constr->contype == CONSTR_NOTNULL)
9944 9164 : set_attnotnull(wqueue, rel, ccon->attnum,
9945 9164 : !constr->skip_validation,
9946 9164 : !constr->skip_validation);
9947 :
9948 10586 : ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
9949 : }
9950 :
9951 : /* At this point we must have a locked-down name to use */
9952 : Assert(newcons == NIL || constr->conname != NULL);
9953 :
9954 : /* Advance command counter in case same table is visited multiple times */
9955 10796 : CommandCounterIncrement();
9956 :
9957 : /*
9958 : * If the constraint got merged with an existing constraint, we're done.
9959 : * We mustn't recurse to child tables in this case, because they've
9960 : * already got the constraint, and visiting them again would lead to an
9961 : * incorrect value for coninhcount.
9962 : */
9963 10796 : if (newcons == NIL)
9964 210 : return address;
9965 :
9966 : /*
9967 : * If adding a NO INHERIT constraint, no need to find our children.
9968 : */
9969 10586 : if (constr->is_no_inherit)
9970 78 : return address;
9971 :
9972 : /*
9973 : * Propagate to children as appropriate. Unlike most other ALTER
9974 : * routines, we have to do this one level of recursion at a time; we can't
9975 : * use find_all_inheritors to do it in one pass.
9976 : */
9977 : children =
9978 10508 : find_inheritance_children(RelationGetRelid(rel), lockmode);
9979 :
9980 : /*
9981 : * Check if ONLY was specified with ALTER TABLE. If so, allow the
9982 : * constraint creation only if there are no children currently. Error out
9983 : * otherwise.
9984 : */
9985 10508 : if (!recurse && children != NIL)
9986 6 : ereport(ERROR,
9987 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
9988 : errmsg("constraint must be added to child tables too")));
9989 :
9990 : /*
9991 : * Recurse to create the constraint on each child.
9992 : */
9993 11290 : foreach(child, children)
9994 : {
9995 818 : Oid childrelid = lfirst_oid(child);
9996 : Relation childrel;
9997 : AlteredTableInfo *childtab;
9998 :
9999 : /* find_inheritance_children already got lock */
10000 818 : childrel = table_open(childrelid, NoLock);
10001 818 : CheckAlterTableIsSafe(childrel);
10002 :
10003 : /* Find or create work queue entry for this table */
10004 818 : childtab = ATGetQueueEntry(wqueue, childrel);
10005 :
10006 : /* Recurse to this child */
10007 818 : ATAddCheckNNConstraint(wqueue, childtab, childrel,
10008 : constr, recurse, true, is_readd, lockmode);
10009 :
10010 788 : table_close(childrel, NoLock);
10011 : }
10012 :
10013 10472 : return address;
10014 : }
10015 :
10016 : /*
10017 : * Add a foreign-key constraint to a single table; return the new constraint's
10018 : * address.
10019 : *
10020 : * Subroutine for ATExecAddConstraint. Must already hold exclusive
10021 : * lock on the rel, and have done appropriate validity checks for it.
10022 : * We do permissions checks here, however.
10023 : *
10024 : * When the referenced or referencing tables (or both) are partitioned,
10025 : * multiple pg_constraint rows are required -- one for each partitioned table
10026 : * and each partition on each side (fortunately, not one for every combination
10027 : * thereof). We also need action triggers on each leaf partition on the
10028 : * referenced side, and check triggers on each leaf partition on the
10029 : * referencing side.
10030 : */
10031 : static ObjectAddress
10032 2638 : ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
10033 : Constraint *fkconstraint,
10034 : bool recurse, bool recursing, LOCKMODE lockmode)
10035 : {
10036 : Relation pkrel;
10037 2638 : int16 pkattnum[INDEX_MAX_KEYS] = {0};
10038 2638 : int16 fkattnum[INDEX_MAX_KEYS] = {0};
10039 2638 : Oid pktypoid[INDEX_MAX_KEYS] = {0};
10040 2638 : Oid fktypoid[INDEX_MAX_KEYS] = {0};
10041 2638 : Oid pkcolloid[INDEX_MAX_KEYS] = {0};
10042 2638 : Oid fkcolloid[INDEX_MAX_KEYS] = {0};
10043 2638 : Oid opclasses[INDEX_MAX_KEYS] = {0};
10044 2638 : Oid pfeqoperators[INDEX_MAX_KEYS] = {0};
10045 2638 : Oid ppeqoperators[INDEX_MAX_KEYS] = {0};
10046 2638 : Oid ffeqoperators[INDEX_MAX_KEYS] = {0};
10047 2638 : int16 fkdelsetcols[INDEX_MAX_KEYS] = {0};
10048 : bool with_period;
10049 : bool pk_has_without_overlaps;
10050 : int i;
10051 : int numfks,
10052 : numpks,
10053 : numfkdelsetcols;
10054 : Oid indexOid;
10055 : bool old_check_ok;
10056 : ObjectAddress address;
10057 2638 : ListCell *old_pfeqop_item = list_head(fkconstraint->old_conpfeqop);
10058 :
10059 : /*
10060 : * Grab ShareRowExclusiveLock on the pk table, so that someone doesn't
10061 : * delete rows out from under us.
10062 : */
10063 2638 : if (OidIsValid(fkconstraint->old_pktable_oid))
10064 72 : pkrel = table_open(fkconstraint->old_pktable_oid, ShareRowExclusiveLock);
10065 : else
10066 2566 : pkrel = table_openrv(fkconstraint->pktable, ShareRowExclusiveLock);
10067 :
10068 : /*
10069 : * Validity checks (permission checks wait till we have the column
10070 : * numbers)
10071 : */
10072 2632 : if (!recurse && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10073 6 : ereport(ERROR,
10074 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
10075 : errmsg("cannot use ONLY for foreign key on partitioned table \"%s\" referencing relation \"%s\"",
10076 : RelationGetRelationName(rel),
10077 : RelationGetRelationName(pkrel)));
10078 :
10079 2626 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10080 340 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10081 0 : ereport(ERROR,
10082 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10083 : errmsg("referenced relation \"%s\" is not a table",
10084 : RelationGetRelationName(pkrel))));
10085 :
10086 2626 : if (!allowSystemTableMods && IsSystemRelation(pkrel))
10087 2 : ereport(ERROR,
10088 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
10089 : errmsg("permission denied: \"%s\" is a system catalog",
10090 : RelationGetRelationName(pkrel))));
10091 :
10092 : /*
10093 : * References from permanent or unlogged tables to temp tables, and from
10094 : * permanent tables to unlogged tables, are disallowed because the
10095 : * referenced data can vanish out from under us. References from temp
10096 : * tables to any other table type are also disallowed, because other
10097 : * backends might need to run the RI triggers on the perm table, but they
10098 : * can't reliably see tuples in the local buffers of other backends.
10099 : */
10100 2624 : switch (rel->rd_rel->relpersistence)
10101 : {
10102 2334 : case RELPERSISTENCE_PERMANENT:
10103 2334 : if (!RelationIsPermanent(pkrel))
10104 0 : ereport(ERROR,
10105 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10106 : errmsg("constraints on permanent tables may reference only permanent tables")));
10107 2334 : break;
10108 12 : case RELPERSISTENCE_UNLOGGED:
10109 12 : if (!RelationIsPermanent(pkrel)
10110 12 : && pkrel->rd_rel->relpersistence != RELPERSISTENCE_UNLOGGED)
10111 0 : ereport(ERROR,
10112 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10113 : errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
10114 12 : break;
10115 278 : case RELPERSISTENCE_TEMP:
10116 278 : if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
10117 0 : ereport(ERROR,
10118 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10119 : errmsg("constraints on temporary tables may reference only temporary tables")));
10120 278 : if (!pkrel->rd_islocaltemp || !rel->rd_islocaltemp)
10121 0 : ereport(ERROR,
10122 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
10123 : errmsg("constraints on temporary tables must involve temporary tables of this session")));
10124 278 : break;
10125 : }
10126 :
10127 : /*
10128 : * Look up the referencing attributes to make sure they exist, and record
10129 : * their attnums and type and collation OIDs.
10130 : */
10131 2624 : numfks = transformColumnNameList(RelationGetRelid(rel),
10132 : fkconstraint->fk_attrs,
10133 : fkattnum, fktypoid, fkcolloid);
10134 2594 : with_period = fkconstraint->fk_with_period || fkconstraint->pk_with_period;
10135 2594 : if (with_period && !fkconstraint->fk_with_period)
10136 24 : ereport(ERROR,
10137 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10138 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10139 :
10140 2570 : numfkdelsetcols = transformColumnNameList(RelationGetRelid(rel),
10141 : fkconstraint->fk_del_set_cols,
10142 : fkdelsetcols, NULL, NULL);
10143 2564 : numfkdelsetcols = validateFkOnDeleteSetColumns(numfks, fkattnum,
10144 : numfkdelsetcols,
10145 : fkdelsetcols,
10146 : fkconstraint->fk_del_set_cols);
10147 :
10148 : /*
10149 : * If the attribute list for the referenced table was omitted, lookup the
10150 : * definition of the primary key and use it. Otherwise, validate the
10151 : * supplied attribute list. In either case, discover the index OID and
10152 : * index opclasses, and the attnums and type and collation OIDs of the
10153 : * attributes.
10154 : */
10155 2558 : if (fkconstraint->pk_attrs == NIL)
10156 : {
10157 1184 : numpks = transformFkeyGetPrimaryKey(pkrel, &indexOid,
10158 : &fkconstraint->pk_attrs,
10159 : pkattnum, pktypoid, pkcolloid,
10160 : opclasses, &pk_has_without_overlaps);
10161 :
10162 : /* If the primary key uses WITHOUT OVERLAPS, the fk must use PERIOD */
10163 1184 : if (pk_has_without_overlaps && !fkconstraint->fk_with_period)
10164 24 : ereport(ERROR,
10165 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10166 : errmsg("foreign key uses PERIOD on the referenced table but not the referencing table"));
10167 : }
10168 : else
10169 : {
10170 1374 : numpks = transformColumnNameList(RelationGetRelid(pkrel),
10171 : fkconstraint->pk_attrs,
10172 : pkattnum, pktypoid, pkcolloid);
10173 :
10174 : /* Since we got pk_attrs, one should be a period. */
10175 1344 : if (with_period && !fkconstraint->pk_with_period)
10176 24 : ereport(ERROR,
10177 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10178 : errmsg("foreign key uses PERIOD on the referencing table but not the referenced table"));
10179 :
10180 : /* Look for an index matching the column list */
10181 1320 : indexOid = transformFkeyCheckAttrs(pkrel, numpks, pkattnum,
10182 : with_period, opclasses, &pk_has_without_overlaps);
10183 : }
10184 :
10185 : /*
10186 : * If the referenced primary key has WITHOUT OVERLAPS, the foreign key
10187 : * must use PERIOD.
10188 : */
10189 2444 : if (pk_has_without_overlaps && !with_period)
10190 12 : ereport(ERROR,
10191 : errcode(ERRCODE_INVALID_FOREIGN_KEY),
10192 : errmsg("foreign key must use PERIOD when referencing a primary using WITHOUT OVERLAPS"));
10193 :
10194 : /*
10195 : * Now we can check permissions.
10196 : */
10197 2432 : checkFkeyPermissions(pkrel, pkattnum, numpks);
10198 :
10199 : /*
10200 : * Check some things for generated columns.
10201 : */
10202 5704 : for (i = 0; i < numfks; i++)
10203 : {
10204 3302 : char attgenerated = TupleDescAttr(RelationGetDescr(rel), fkattnum[i] - 1)->attgenerated;
10205 :
10206 3302 : if (attgenerated)
10207 : {
10208 : /*
10209 : * Check restrictions on UPDATE/DELETE actions, per SQL standard
10210 : */
10211 48 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10212 48 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT ||
10213 48 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE)
10214 12 : ereport(ERROR,
10215 : (errcode(ERRCODE_SYNTAX_ERROR),
10216 : errmsg("invalid %s action for foreign key constraint containing generated column",
10217 : "ON UPDATE")));
10218 36 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10219 24 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10220 12 : ereport(ERROR,
10221 : (errcode(ERRCODE_SYNTAX_ERROR),
10222 : errmsg("invalid %s action for foreign key constraint containing generated column",
10223 : "ON DELETE")));
10224 : }
10225 :
10226 : /*
10227 : * FKs on virtual columns are not supported. This would require
10228 : * various additional support in ri_triggers.c, including special
10229 : * handling in ri_NullCheck(), ri_KeysEqual(),
10230 : * RI_FKey_fk_upd_check_required() (since all virtual columns appear
10231 : * as NULL there). Also not really practical as long as you can't
10232 : * index virtual columns.
10233 : */
10234 3278 : if (attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
10235 6 : ereport(ERROR,
10236 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10237 : errmsg("foreign key constraints on virtual generated columns are not supported")));
10238 : }
10239 :
10240 : /*
10241 : * Some actions are currently unsupported for foreign keys using PERIOD.
10242 : */
10243 2402 : if (fkconstraint->fk_with_period)
10244 : {
10245 248 : if (fkconstraint->fk_upd_action == FKCONSTR_ACTION_RESTRICT ||
10246 236 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_CASCADE ||
10247 218 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETNULL ||
10248 200 : fkconstraint->fk_upd_action == FKCONSTR_ACTION_SETDEFAULT)
10249 66 : ereport(ERROR,
10250 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10251 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10252 : "ON UPDATE"));
10253 :
10254 182 : if (fkconstraint->fk_del_action == FKCONSTR_ACTION_RESTRICT ||
10255 176 : fkconstraint->fk_del_action == FKCONSTR_ACTION_CASCADE ||
10256 176 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETNULL ||
10257 176 : fkconstraint->fk_del_action == FKCONSTR_ACTION_SETDEFAULT)
10258 6 : ereport(ERROR,
10259 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
10260 : errmsg("unsupported %s action for foreign key constraint using PERIOD",
10261 : "ON DELETE"));
10262 : }
10263 :
10264 : /*
10265 : * Look up the equality operators to use in the constraint.
10266 : *
10267 : * Note that we have to be careful about the difference between the actual
10268 : * PK column type and the opclass' declared input type, which might be
10269 : * only binary-compatible with it. The declared opcintype is the right
10270 : * thing to probe pg_amop with.
10271 : */
10272 2330 : if (numfks != numpks)
10273 0 : ereport(ERROR,
10274 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
10275 : errmsg("number of referencing and referenced columns for foreign key disagree")));
10276 :
10277 : /*
10278 : * On the strength of a previous constraint, we might avoid scanning
10279 : * tables to validate this one. See below.
10280 : */
10281 2330 : old_check_ok = (fkconstraint->old_conpfeqop != NIL);
10282 : Assert(!old_check_ok || numfks == list_length(fkconstraint->old_conpfeqop));
10283 :
10284 5074 : for (i = 0; i < numpks; i++)
10285 : {
10286 2984 : Oid pktype = pktypoid[i];
10287 2984 : Oid fktype = fktypoid[i];
10288 : Oid fktyped;
10289 2984 : Oid pkcoll = pkcolloid[i];
10290 2984 : Oid fkcoll = fkcolloid[i];
10291 : HeapTuple cla_ht;
10292 : Form_pg_opclass cla_tup;
10293 : Oid amid;
10294 : Oid opfamily;
10295 : Oid opcintype;
10296 : bool for_overlaps;
10297 : CompareType cmptype;
10298 : Oid pfeqop;
10299 : Oid ppeqop;
10300 : Oid ffeqop;
10301 : int16 eqstrategy;
10302 : Oid pfeqop_right;
10303 :
10304 : /* We need several fields out of the pg_opclass entry */
10305 2984 : cla_ht = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclasses[i]));
10306 2984 : if (!HeapTupleIsValid(cla_ht))
10307 0 : elog(ERROR, "cache lookup failed for opclass %u", opclasses[i]);
10308 2984 : cla_tup = (Form_pg_opclass) GETSTRUCT(cla_ht);
10309 2984 : amid = cla_tup->opcmethod;
10310 2984 : opfamily = cla_tup->opcfamily;
10311 2984 : opcintype = cla_tup->opcintype;
10312 2984 : ReleaseSysCache(cla_ht);
10313 :
10314 : /*
10315 : * Get strategy number from index AM.
10316 : *
10317 : * For a normal foreign-key constraint, this should not fail, since we
10318 : * already checked that the index is unique and should therefore have
10319 : * appropriate equal operators. For a period foreign key, this could
10320 : * fail if we selected a non-matching exclusion constraint earlier.
10321 : * (XXX Maybe we should do these lookups earlier so we don't end up
10322 : * doing that.)
10323 : */
10324 2984 : for_overlaps = with_period && i == numpks - 1;
10325 2984 : cmptype = for_overlaps ? COMPARE_OVERLAP : COMPARE_EQ;
10326 2984 : eqstrategy = IndexAmTranslateCompareType(cmptype, amid, opfamily, true);
10327 2984 : if (eqstrategy == InvalidStrategy)
10328 0 : ereport(ERROR,
10329 : errcode(ERRCODE_UNDEFINED_OBJECT),
10330 : for_overlaps
10331 : ? errmsg("could not identify an overlaps operator for foreign key")
10332 : : errmsg("could not identify an equality operator for foreign key"),
10333 : errdetail("Could not translate compare type %d for operator family \"%s\", input type %s, access method \"%s\".",
10334 : cmptype, get_opfamily_name(opfamily, false), format_type_be(opcintype), get_am_name(amid)));
10335 :
10336 : /*
10337 : * There had better be a primary equality operator for the index.
10338 : * We'll use it for PK = PK comparisons.
10339 : */
10340 2984 : ppeqop = get_opfamily_member(opfamily, opcintype, opcintype,
10341 : eqstrategy);
10342 :
10343 2984 : if (!OidIsValid(ppeqop))
10344 0 : elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
10345 : eqstrategy, opcintype, opcintype, opfamily);
10346 :
10347 : /*
10348 : * Are there equality operators that take exactly the FK type? Assume
10349 : * we should look through any domain here.
10350 : */
10351 2984 : fktyped = getBaseType(fktype);
10352 :
10353 2984 : pfeqop = get_opfamily_member(opfamily, opcintype, fktyped,
10354 : eqstrategy);
10355 2984 : if (OidIsValid(pfeqop))
10356 : {
10357 2344 : pfeqop_right = fktyped;
10358 2344 : ffeqop = get_opfamily_member(opfamily, fktyped, fktyped,
10359 : eqstrategy);
10360 : }
10361 : else
10362 : {
10363 : /* keep compiler quiet */
10364 640 : pfeqop_right = InvalidOid;
10365 640 : ffeqop = InvalidOid;
10366 : }
10367 :
10368 2984 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10369 : {
10370 : /*
10371 : * Otherwise, look for an implicit cast from the FK type to the
10372 : * opcintype, and if found, use the primary equality operator.
10373 : * This is a bit tricky because opcintype might be a polymorphic
10374 : * type such as ANYARRAY or ANYENUM; so what we have to test is
10375 : * whether the two actual column types can be concurrently cast to
10376 : * that type. (Otherwise, we'd fail to reject combinations such
10377 : * as int[] and point[].)
10378 : */
10379 : Oid input_typeids[2];
10380 : Oid target_typeids[2];
10381 :
10382 640 : input_typeids[0] = pktype;
10383 640 : input_typeids[1] = fktype;
10384 640 : target_typeids[0] = opcintype;
10385 640 : target_typeids[1] = opcintype;
10386 640 : if (can_coerce_type(2, input_typeids, target_typeids,
10387 : COERCION_IMPLICIT))
10388 : {
10389 412 : pfeqop = ffeqop = ppeqop;
10390 412 : pfeqop_right = opcintype;
10391 : }
10392 : }
10393 :
10394 2984 : if (!(OidIsValid(pfeqop) && OidIsValid(ffeqop)))
10395 228 : ereport(ERROR,
10396 : (errcode(ERRCODE_DATATYPE_MISMATCH),
10397 : errmsg("foreign key constraint \"%s\" cannot be implemented",
10398 : fkconstraint->conname),
10399 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10400 : "are of incompatible types: %s and %s.",
10401 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10402 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10403 : format_type_be(fktype),
10404 : format_type_be(pktype))));
10405 :
10406 : /*
10407 : * This shouldn't be possible, but better check to make sure we have a
10408 : * consistent state for the check below.
10409 : */
10410 2756 : if ((OidIsValid(pkcoll) && !OidIsValid(fkcoll)) || (!OidIsValid(pkcoll) && OidIsValid(fkcoll)))
10411 0 : elog(ERROR, "key columns are not both collatable");
10412 :
10413 2756 : if (OidIsValid(pkcoll) && OidIsValid(fkcoll))
10414 : {
10415 : bool pkcolldet;
10416 : bool fkcolldet;
10417 :
10418 106 : pkcolldet = get_collation_isdeterministic(pkcoll);
10419 106 : fkcolldet = get_collation_isdeterministic(fkcoll);
10420 :
10421 : /*
10422 : * SQL requires that both collations are the same. This is
10423 : * because we need a consistent notion of equality on both
10424 : * columns. We relax this by allowing different collations if
10425 : * they are both deterministic. (This is also for backward
10426 : * compatibility, because PostgreSQL has always allowed this.)
10427 : */
10428 106 : if ((!pkcolldet || !fkcolldet) && pkcoll != fkcoll)
10429 12 : ereport(ERROR,
10430 : (errcode(ERRCODE_COLLATION_MISMATCH),
10431 : errmsg("foreign key constraint \"%s\" cannot be implemented", fkconstraint->conname),
10432 : errdetail("Key columns \"%s\" of the referencing table and \"%s\" of the referenced table "
10433 : "have incompatible collations: \"%s\" and \"%s\". "
10434 : "If either collation is nondeterministic, then both collations have to be the same.",
10435 : strVal(list_nth(fkconstraint->fk_attrs, i)),
10436 : strVal(list_nth(fkconstraint->pk_attrs, i)),
10437 : get_collation_name(fkcoll),
10438 : get_collation_name(pkcoll))));
10439 : }
10440 :
10441 2744 : if (old_check_ok)
10442 : {
10443 : /*
10444 : * When a pfeqop changes, revalidate the constraint. We could
10445 : * permit intra-opfamily changes, but that adds subtle complexity
10446 : * without any concrete benefit for core types. We need not
10447 : * assess ppeqop or ffeqop, which RI_Initial_Check() does not use.
10448 : */
10449 6 : old_check_ok = (pfeqop == lfirst_oid(old_pfeqop_item));
10450 6 : old_pfeqop_item = lnext(fkconstraint->old_conpfeqop,
10451 : old_pfeqop_item);
10452 : }
10453 2744 : if (old_check_ok)
10454 : {
10455 : Oid old_fktype;
10456 : Oid new_fktype;
10457 : CoercionPathType old_pathtype;
10458 : CoercionPathType new_pathtype;
10459 : Oid old_castfunc;
10460 : Oid new_castfunc;
10461 : Oid old_fkcoll;
10462 : Oid new_fkcoll;
10463 6 : Form_pg_attribute attr = TupleDescAttr(tab->oldDesc,
10464 6 : fkattnum[i] - 1);
10465 :
10466 : /*
10467 : * Identify coercion pathways from each of the old and new FK-side
10468 : * column types to the right (foreign) operand type of the pfeqop.
10469 : * We may assume that pg_constraint.conkey is not changing.
10470 : */
10471 6 : old_fktype = attr->atttypid;
10472 6 : new_fktype = fktype;
10473 6 : old_pathtype = findFkeyCast(pfeqop_right, old_fktype,
10474 : &old_castfunc);
10475 6 : new_pathtype = findFkeyCast(pfeqop_right, new_fktype,
10476 : &new_castfunc);
10477 :
10478 6 : old_fkcoll = attr->attcollation;
10479 6 : new_fkcoll = fkcoll;
10480 :
10481 : /*
10482 : * Upon a change to the cast from the FK column to its pfeqop
10483 : * operand, revalidate the constraint. For this evaluation, a
10484 : * binary coercion cast is equivalent to no cast at all. While
10485 : * type implementors should design implicit casts with an eye
10486 : * toward consistency of operations like equality, we cannot
10487 : * assume here that they have done so.
10488 : *
10489 : * A function with a polymorphic argument could change behavior
10490 : * arbitrarily in response to get_fn_expr_argtype(). Therefore,
10491 : * when the cast destination is polymorphic, we only avoid
10492 : * revalidation if the input type has not changed at all. Given
10493 : * just the core data types and operator classes, this requirement
10494 : * prevents no would-be optimizations.
10495 : *
10496 : * If the cast converts from a base type to a domain thereon, then
10497 : * that domain type must be the opcintype of the unique index.
10498 : * Necessarily, the primary key column must then be of the domain
10499 : * type. Since the constraint was previously valid, all values on
10500 : * the foreign side necessarily exist on the primary side and in
10501 : * turn conform to the domain. Consequently, we need not treat
10502 : * domains specially here.
10503 : *
10504 : * If the collation changes, revalidation is required, unless both
10505 : * collations are deterministic, because those share the same
10506 : * notion of equality (because texteq reduces to bitwise
10507 : * equality).
10508 : *
10509 : * We need not directly consider the PK type. It's necessarily
10510 : * binary coercible to the opcintype of the unique index column,
10511 : * and ri_triggers.c will only deal with PK datums in terms of
10512 : * that opcintype. Changing the opcintype also changes pfeqop.
10513 : */
10514 6 : old_check_ok = (new_pathtype == old_pathtype &&
10515 6 : new_castfunc == old_castfunc &&
10516 6 : (!IsPolymorphicType(pfeqop_right) ||
10517 12 : new_fktype == old_fktype) &&
10518 0 : (new_fkcoll == old_fkcoll ||
10519 0 : (get_collation_isdeterministic(old_fkcoll) && get_collation_isdeterministic(new_fkcoll))));
10520 : }
10521 :
10522 2744 : pfeqoperators[i] = pfeqop;
10523 2744 : ppeqoperators[i] = ppeqop;
10524 2744 : ffeqoperators[i] = ffeqop;
10525 : }
10526 :
10527 : /*
10528 : * For FKs with PERIOD we need additional operators to check whether the
10529 : * referencing row's range is contained by the aggregated ranges of the
10530 : * referenced row(s). For rangetypes and multirangetypes this is
10531 : * fk.periodatt <@ range_agg(pk.periodatt). Those are the only types we
10532 : * support for now. FKs will look these up at "runtime", but we should
10533 : * make sure the lookup works here, even if we don't use the values.
10534 : */
10535 2090 : if (with_period)
10536 : {
10537 : Oid periodoperoid;
10538 : Oid aggedperiodoperoid;
10539 : Oid intersectoperoid;
10540 :
10541 158 : FindFKPeriodOpers(opclasses[numpks - 1], &periodoperoid, &aggedperiodoperoid,
10542 : &intersectoperoid);
10543 : }
10544 :
10545 : /* First, create the constraint catalog entry itself. */
10546 2090 : address = addFkConstraint(addFkBothSides,
10547 : fkconstraint->conname, fkconstraint, rel, pkrel,
10548 : indexOid,
10549 : InvalidOid, /* no parent constraint */
10550 : numfks,
10551 : pkattnum,
10552 : fkattnum,
10553 : pfeqoperators,
10554 : ppeqoperators,
10555 : ffeqoperators,
10556 : numfkdelsetcols,
10557 : fkdelsetcols,
10558 : false,
10559 : with_period);
10560 :
10561 : /* Next process the action triggers at the referenced side and recurse */
10562 2090 : addFkRecurseReferenced(fkconstraint, rel, pkrel,
10563 : indexOid,
10564 : address.objectId,
10565 : numfks,
10566 : pkattnum,
10567 : fkattnum,
10568 : pfeqoperators,
10569 : ppeqoperators,
10570 : ffeqoperators,
10571 : numfkdelsetcols,
10572 : fkdelsetcols,
10573 : old_check_ok,
10574 : InvalidOid, InvalidOid,
10575 : with_period);
10576 :
10577 : /* Lastly create the check triggers at the referencing side and recurse */
10578 2090 : addFkRecurseReferencing(wqueue, fkconstraint, rel, pkrel,
10579 : indexOid,
10580 : address.objectId,
10581 : numfks,
10582 : pkattnum,
10583 : fkattnum,
10584 : pfeqoperators,
10585 : ppeqoperators,
10586 : ffeqoperators,
10587 : numfkdelsetcols,
10588 : fkdelsetcols,
10589 : old_check_ok,
10590 : lockmode,
10591 : InvalidOid, InvalidOid,
10592 : with_period);
10593 :
10594 : /*
10595 : * Done. Close pk table, but keep lock until we've committed.
10596 : */
10597 2090 : table_close(pkrel, NoLock);
10598 :
10599 2090 : return address;
10600 : }
10601 :
10602 : /*
10603 : * validateFkOnDeleteSetColumns
10604 : * Verifies that columns used in ON DELETE SET NULL/DEFAULT (...)
10605 : * column lists are valid.
10606 : *
10607 : * If there are duplicates in the fksetcolsattnums[] array, this silently
10608 : * removes the dups. The new count of numfksetcols is returned.
10609 : */
10610 : static int
10611 2564 : validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
10612 : int numfksetcols, int16 *fksetcolsattnums,
10613 : List *fksetcols)
10614 : {
10615 2564 : int numcolsout = 0;
10616 :
10617 2594 : for (int i = 0; i < numfksetcols; i++)
10618 : {
10619 36 : int16 setcol_attnum = fksetcolsattnums[i];
10620 36 : bool seen = false;
10621 :
10622 : /* Make sure it's in fkattnums[] */
10623 66 : for (int j = 0; j < numfks; j++)
10624 : {
10625 60 : if (fkattnums[j] == setcol_attnum)
10626 : {
10627 30 : seen = true;
10628 30 : break;
10629 : }
10630 : }
10631 :
10632 36 : if (!seen)
10633 : {
10634 6 : char *col = strVal(list_nth(fksetcols, i));
10635 :
10636 6 : ereport(ERROR,
10637 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
10638 : errmsg("column \"%s\" referenced in ON DELETE SET action must be part of foreign key", col)));
10639 : }
10640 :
10641 : /* Now check for dups */
10642 30 : seen = false;
10643 30 : for (int j = 0; j < numcolsout; j++)
10644 : {
10645 6 : if (fksetcolsattnums[j] == setcol_attnum)
10646 : {
10647 6 : seen = true;
10648 6 : break;
10649 : }
10650 : }
10651 30 : if (!seen)
10652 24 : fksetcolsattnums[numcolsout++] = setcol_attnum;
10653 : }
10654 2558 : return numcolsout;
10655 : }
10656 :
10657 : /*
10658 : * addFkConstraint
10659 : * Install pg_constraint entries to implement a foreign key constraint.
10660 : * Caller must separately invoke addFkRecurseReferenced and
10661 : * addFkRecurseReferencing, as appropriate, to install pg_trigger entries
10662 : * and (for partitioned tables) recurse to partitions.
10663 : *
10664 : * fkside: the side of the FK (or both) to create. Caller should
10665 : * call addFkRecurseReferenced if this is addFkReferencedSide,
10666 : * addFkRecurseReferencing if it's addFkReferencingSide, or both if it's
10667 : * addFkBothSides.
10668 : * constraintname: the base name for the constraint being added,
10669 : * copied to fkconstraint->conname if the latter is not set
10670 : * fkconstraint: the constraint being added
10671 : * rel: the root referencing relation
10672 : * pkrel: the referenced relation; might be a partition, if recursing
10673 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10674 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10675 : * top-level constraint
10676 : * numfks: the number of columns in the foreign key
10677 : * pkattnum: the attnum array of referenced attributes
10678 : * fkattnum: the attnum array of referencing attributes
10679 : * pf/pp/ffeqoperators: OID array of operators between columns
10680 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10681 : * (...) clause
10682 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10683 : * NULL/DEFAULT clause
10684 : * with_period: true if this is a temporal FK
10685 : */
10686 : static ObjectAddress
10687 4044 : addFkConstraint(addFkConstraintSides fkside,
10688 : char *constraintname, Constraint *fkconstraint,
10689 : Relation rel, Relation pkrel, Oid indexOid, Oid parentConstr,
10690 : int numfks, int16 *pkattnum,
10691 : int16 *fkattnum, Oid *pfeqoperators, Oid *ppeqoperators,
10692 : Oid *ffeqoperators, int numfkdelsetcols, int16 *fkdelsetcols,
10693 : bool is_internal, bool with_period)
10694 : {
10695 : ObjectAddress address;
10696 : Oid constrOid;
10697 : char *conname;
10698 : bool conislocal;
10699 : int16 coninhcount;
10700 : bool connoinherit;
10701 :
10702 : /*
10703 : * Verify relkind for each referenced partition. At the top level, this
10704 : * is redundant with a previous check, but we need it when recursing.
10705 : */
10706 4044 : if (pkrel->rd_rel->relkind != RELKIND_RELATION &&
10707 850 : pkrel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
10708 0 : ereport(ERROR,
10709 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
10710 : errmsg("referenced relation \"%s\" is not a table",
10711 : RelationGetRelationName(pkrel))));
10712 :
10713 : /*
10714 : * Caller supplies us with a constraint name; however, it may be used in
10715 : * this partition, so come up with a different one in that case. Unless
10716 : * truncation to NAMEDATALEN dictates otherwise, the new name will be the
10717 : * supplied name with an underscore and digit(s) appended.
10718 : */
10719 4044 : if (ConstraintNameIsUsed(CONSTRAINT_RELATION,
10720 : RelationGetRelid(rel),
10721 : constraintname))
10722 1142 : conname = ChooseConstraintName(constraintname,
10723 : NULL,
10724 : "",
10725 1142 : RelationGetNamespace(rel), NIL);
10726 : else
10727 2902 : conname = constraintname;
10728 :
10729 4044 : if (fkconstraint->conname == NULL)
10730 412 : fkconstraint->conname = pstrdup(conname);
10731 :
10732 4044 : if (OidIsValid(parentConstr))
10733 : {
10734 1954 : conislocal = false;
10735 1954 : coninhcount = 1;
10736 1954 : connoinherit = false;
10737 : }
10738 : else
10739 : {
10740 2090 : conislocal = true;
10741 2090 : coninhcount = 0;
10742 :
10743 : /*
10744 : * always inherit for partitioned tables, never for legacy inheritance
10745 : */
10746 2090 : connoinherit = rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE;
10747 : }
10748 :
10749 : /*
10750 : * Record the FK constraint in pg_constraint.
10751 : */
10752 4044 : constrOid = CreateConstraintEntry(conname,
10753 4044 : RelationGetNamespace(rel),
10754 : CONSTRAINT_FOREIGN,
10755 4044 : fkconstraint->deferrable,
10756 4044 : fkconstraint->initdeferred,
10757 4044 : fkconstraint->is_enforced,
10758 4044 : fkconstraint->initially_valid,
10759 : parentConstr,
10760 : RelationGetRelid(rel),
10761 : fkattnum,
10762 : numfks,
10763 : numfks,
10764 : InvalidOid, /* not a domain constraint */
10765 : indexOid,
10766 : RelationGetRelid(pkrel),
10767 : pkattnum,
10768 : pfeqoperators,
10769 : ppeqoperators,
10770 : ffeqoperators,
10771 : numfks,
10772 4044 : fkconstraint->fk_upd_action,
10773 4044 : fkconstraint->fk_del_action,
10774 : fkdelsetcols,
10775 : numfkdelsetcols,
10776 4044 : fkconstraint->fk_matchtype,
10777 : NULL, /* no exclusion constraint */
10778 : NULL, /* no check constraint */
10779 : NULL,
10780 : conislocal, /* islocal */
10781 : coninhcount, /* inhcount */
10782 : connoinherit, /* conNoInherit */
10783 : with_period, /* conPeriod */
10784 : is_internal); /* is_internal */
10785 :
10786 4044 : ObjectAddressSet(address, ConstraintRelationId, constrOid);
10787 :
10788 : /*
10789 : * In partitioning cases, create the dependency entries for this
10790 : * constraint. (For non-partitioned cases, relevant entries were created
10791 : * by CreateConstraintEntry.)
10792 : *
10793 : * On the referenced side, we need the constraint to have an internal
10794 : * dependency on its parent constraint; this means that this constraint
10795 : * cannot be dropped on its own -- only through the parent constraint. It
10796 : * also means the containing partition cannot be dropped on its own, but
10797 : * it can be detached, at which point this dependency is removed (after
10798 : * verifying that no rows are referenced via this FK.)
10799 : *
10800 : * When processing the referencing side, we link the constraint via the
10801 : * special partitioning dependencies: the parent constraint is the primary
10802 : * dependent, and the partition on which the foreign key exists is the
10803 : * secondary dependency. That way, this constraint is dropped if either
10804 : * of these objects is.
10805 : *
10806 : * Note that this is only necessary for the subsidiary pg_constraint rows
10807 : * in partitions; the topmost row doesn't need any of this.
10808 : */
10809 4044 : if (OidIsValid(parentConstr))
10810 : {
10811 : ObjectAddress referenced;
10812 :
10813 1954 : ObjectAddressSet(referenced, ConstraintRelationId, parentConstr);
10814 :
10815 : Assert(fkside != addFkBothSides);
10816 1954 : if (fkside == addFkReferencedSide)
10817 1136 : recordDependencyOn(&address, &referenced, DEPENDENCY_INTERNAL);
10818 : else
10819 : {
10820 818 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_PRI);
10821 818 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
10822 818 : recordDependencyOn(&address, &referenced, DEPENDENCY_PARTITION_SEC);
10823 : }
10824 : }
10825 :
10826 : /* make new constraint visible, in case we add more */
10827 4044 : CommandCounterIncrement();
10828 :
10829 4044 : return address;
10830 : }
10831 :
10832 : /*
10833 : * addFkRecurseReferenced
10834 : * Recursive helper for the referenced side of foreign key creation,
10835 : * which creates the action triggers and recurses
10836 : *
10837 : * If the referenced relation is a plain relation, create the necessary action
10838 : * triggers that implement the constraint. If the referenced relation is a
10839 : * partitioned table, then we create a pg_constraint row referencing the parent
10840 : * of the referencing side for it and recurse on this routine for each
10841 : * partition.
10842 : *
10843 : * fkconstraint: the constraint being added
10844 : * rel: the root referencing relation
10845 : * pkrel: the referenced relation; might be a partition, if recursing
10846 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10847 : * parentConstr: the OID of a parent constraint; InvalidOid if this is a
10848 : * top-level constraint
10849 : * numfks: the number of columns in the foreign key
10850 : * pkattnum: the attnum array of referenced attributes
10851 : * fkattnum: the attnum array of referencing attributes
10852 : * numfkdelsetcols: the number of columns in the ON DELETE SET
10853 : * NULL/DEFAULT (...) clause
10854 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10855 : * NULL/DEFAULT clause
10856 : * pf/pp/ffeqoperators: OID array of operators between columns
10857 : * old_check_ok: true if this constraint replaces an existing one that
10858 : * was already validated (thus this one doesn't need validation)
10859 : * parentDelTrigger and parentUpdTrigger: when recursively called on a
10860 : * partition, the OIDs of the parent action triggers for DELETE and
10861 : * UPDATE respectively.
10862 : * with_period: true if this is a temporal FK
10863 : */
10864 : static void
10865 3328 : addFkRecurseReferenced(Constraint *fkconstraint, Relation rel,
10866 : Relation pkrel, Oid indexOid, Oid parentConstr,
10867 : int numfks,
10868 : int16 *pkattnum, int16 *fkattnum, Oid *pfeqoperators,
10869 : Oid *ppeqoperators, Oid *ffeqoperators,
10870 : int numfkdelsetcols, int16 *fkdelsetcols,
10871 : bool old_check_ok,
10872 : Oid parentDelTrigger, Oid parentUpdTrigger,
10873 : bool with_period)
10874 : {
10875 3328 : Oid deleteTriggerOid = InvalidOid,
10876 3328 : updateTriggerOid = InvalidOid;
10877 :
10878 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
10879 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
10880 :
10881 : /*
10882 : * Create action triggers to enforce the constraint, or skip them if the
10883 : * constraint is NOT ENFORCED.
10884 : */
10885 3328 : if (fkconstraint->is_enforced)
10886 3298 : createForeignKeyActionTriggers(RelationGetRelid(rel),
10887 : RelationGetRelid(pkrel),
10888 : fkconstraint,
10889 : parentConstr, indexOid,
10890 : parentDelTrigger, parentUpdTrigger,
10891 : &deleteTriggerOid, &updateTriggerOid);
10892 :
10893 : /*
10894 : * If the referenced table is partitioned, recurse on ourselves to handle
10895 : * each partition. We need one pg_constraint row created for each
10896 : * partition in addition to the pg_constraint row for the parent table.
10897 : */
10898 3328 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
10899 : {
10900 540 : PartitionDesc pd = RelationGetPartitionDesc(pkrel, true);
10901 :
10902 1490 : for (int i = 0; i < pd->nparts; i++)
10903 : {
10904 : Relation partRel;
10905 : AttrMap *map;
10906 : AttrNumber *mapped_pkattnum;
10907 : Oid partIndexId;
10908 : ObjectAddress address;
10909 :
10910 : /* XXX would it be better to acquire these locks beforehand? */
10911 950 : partRel = table_open(pd->oids[i], ShareRowExclusiveLock);
10912 :
10913 : /*
10914 : * Map the attribute numbers in the referenced side of the FK
10915 : * definition to match the partition's column layout.
10916 : */
10917 950 : map = build_attrmap_by_name_if_req(RelationGetDescr(partRel),
10918 : RelationGetDescr(pkrel),
10919 : false);
10920 950 : if (map)
10921 : {
10922 130 : mapped_pkattnum = palloc(sizeof(AttrNumber) * numfks);
10923 272 : for (int j = 0; j < numfks; j++)
10924 142 : mapped_pkattnum[j] = map->attnums[pkattnum[j] - 1];
10925 : }
10926 : else
10927 820 : mapped_pkattnum = pkattnum;
10928 :
10929 : /* Determine the index to use at this level */
10930 950 : partIndexId = index_get_partition(partRel, indexOid);
10931 950 : if (!OidIsValid(partIndexId))
10932 0 : elog(ERROR, "index for %u not found in partition %s",
10933 : indexOid, RelationGetRelationName(partRel));
10934 :
10935 : /* Create entry at this level ... */
10936 950 : address = addFkConstraint(addFkReferencedSide,
10937 : fkconstraint->conname, fkconstraint, rel,
10938 : partRel, partIndexId, parentConstr,
10939 : numfks, mapped_pkattnum,
10940 : fkattnum, pfeqoperators, ppeqoperators,
10941 : ffeqoperators, numfkdelsetcols,
10942 : fkdelsetcols, true, with_period);
10943 : /* ... and recurse to our children */
10944 950 : addFkRecurseReferenced(fkconstraint, rel, partRel,
10945 : partIndexId, address.objectId, numfks,
10946 : mapped_pkattnum, fkattnum,
10947 : pfeqoperators, ppeqoperators, ffeqoperators,
10948 : numfkdelsetcols, fkdelsetcols,
10949 : old_check_ok,
10950 : deleteTriggerOid, updateTriggerOid,
10951 : with_period);
10952 :
10953 : /* Done -- clean up (but keep the lock) */
10954 950 : table_close(partRel, NoLock);
10955 950 : if (map)
10956 : {
10957 130 : pfree(mapped_pkattnum);
10958 130 : free_attrmap(map);
10959 : }
10960 : }
10961 : }
10962 3328 : }
10963 :
10964 : /*
10965 : * addFkRecurseReferencing
10966 : * Recursive helper for the referencing side of foreign key creation,
10967 : * which creates the check triggers and recurses
10968 : *
10969 : * If the referencing relation is a plain relation, create the necessary check
10970 : * triggers that implement the constraint, and set up for Phase 3 constraint
10971 : * verification. If the referencing relation is a partitioned table, then
10972 : * we create a pg_constraint row for it and recurse on this routine for each
10973 : * partition.
10974 : *
10975 : * We assume that the referenced relation is locked against concurrent
10976 : * deletions. If it's a partitioned relation, every partition must be so
10977 : * locked.
10978 : *
10979 : * wqueue: the ALTER TABLE work queue; NULL when not running as part
10980 : * of an ALTER TABLE sequence.
10981 : * fkconstraint: the constraint being added
10982 : * rel: the referencing relation; might be a partition, if recursing
10983 : * pkrel: the root referenced relation
10984 : * indexOid: the OID of the index (on pkrel) implementing this constraint
10985 : * parentConstr: the OID of the parent constraint (there is always one)
10986 : * numfks: the number of columns in the foreign key
10987 : * pkattnum: the attnum array of referenced attributes
10988 : * fkattnum: the attnum array of referencing attributes
10989 : * pf/pp/ffeqoperators: OID array of operators between columns
10990 : * numfkdelsetcols: the number of columns in the ON DELETE SET NULL/DEFAULT
10991 : * (...) clause
10992 : * fkdelsetcols: the attnum array of the columns in the ON DELETE SET
10993 : * NULL/DEFAULT clause
10994 : * old_check_ok: true if this constraint replaces an existing one that
10995 : * was already validated (thus this one doesn't need validation)
10996 : * lockmode: the lockmode to acquire on partitions when recursing
10997 : * parentInsTrigger and parentUpdTrigger: when being recursively called on
10998 : * a partition, the OIDs of the parent check triggers for INSERT and
10999 : * UPDATE respectively.
11000 : * with_period: true if this is a temporal FK
11001 : */
11002 : static void
11003 2908 : addFkRecurseReferencing(List **wqueue, Constraint *fkconstraint, Relation rel,
11004 : Relation pkrel, Oid indexOid, Oid parentConstr,
11005 : int numfks, int16 *pkattnum, int16 *fkattnum,
11006 : Oid *pfeqoperators, Oid *ppeqoperators, Oid *ffeqoperators,
11007 : int numfkdelsetcols, int16 *fkdelsetcols,
11008 : bool old_check_ok, LOCKMODE lockmode,
11009 : Oid parentInsTrigger, Oid parentUpdTrigger,
11010 : bool with_period)
11011 : {
11012 2908 : Oid insertTriggerOid = InvalidOid,
11013 2908 : updateTriggerOid = InvalidOid;
11014 :
11015 : Assert(OidIsValid(parentConstr));
11016 : Assert(CheckRelationLockedByMe(rel, ShareRowExclusiveLock, true));
11017 : Assert(CheckRelationLockedByMe(pkrel, ShareRowExclusiveLock, true));
11018 :
11019 2908 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11020 0 : ereport(ERROR,
11021 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11022 : errmsg("foreign key constraints are not supported on foreign tables")));
11023 :
11024 : /*
11025 : * Add check triggers if the constraint is ENFORCED, and if needed,
11026 : * schedule them to be checked in Phase 3.
11027 : *
11028 : * If the relation is partitioned, drill down to do it to its partitions.
11029 : */
11030 2908 : if (fkconstraint->is_enforced)
11031 2872 : createForeignKeyCheckTriggers(RelationGetRelid(rel),
11032 : RelationGetRelid(pkrel),
11033 : fkconstraint,
11034 : parentConstr,
11035 : indexOid,
11036 : parentInsTrigger, parentUpdTrigger,
11037 : &insertTriggerOid, &updateTriggerOid);
11038 :
11039 2908 : if (rel->rd_rel->relkind == RELKIND_RELATION)
11040 : {
11041 : /*
11042 : * Tell Phase 3 to check that the constraint is satisfied by existing
11043 : * rows. We can skip this during table creation, when constraint is
11044 : * specified as NOT ENFORCED, or when requested explicitly by
11045 : * specifying NOT VALID in an ADD FOREIGN KEY command, and when we're
11046 : * recreating a constraint following a SET DATA TYPE operation that
11047 : * did not impugn its validity.
11048 : */
11049 2420 : if (wqueue && !old_check_ok && !fkconstraint->skip_validation &&
11050 836 : fkconstraint->is_enforced)
11051 : {
11052 : NewConstraint *newcon;
11053 : AlteredTableInfo *tab;
11054 :
11055 836 : tab = ATGetQueueEntry(wqueue, rel);
11056 :
11057 836 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
11058 836 : newcon->name = get_constraint_name(parentConstr);
11059 836 : newcon->contype = CONSTR_FOREIGN;
11060 836 : newcon->refrelid = RelationGetRelid(pkrel);
11061 836 : newcon->refindid = indexOid;
11062 836 : newcon->conid = parentConstr;
11063 836 : newcon->conwithperiod = fkconstraint->fk_with_period;
11064 836 : newcon->qual = (Node *) fkconstraint;
11065 :
11066 836 : tab->constraints = lappend(tab->constraints, newcon);
11067 : }
11068 : }
11069 488 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11070 : {
11071 488 : PartitionDesc pd = RelationGetPartitionDesc(rel, true);
11072 : Relation trigrel;
11073 :
11074 : /*
11075 : * Triggers of the foreign keys will be manipulated a bunch of times
11076 : * in the loop below. To avoid repeatedly opening/closing the trigger
11077 : * catalog relation, we open it here and pass it to the subroutines
11078 : * called below.
11079 : */
11080 488 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11081 :
11082 : /*
11083 : * Recurse to take appropriate action on each partition; either we
11084 : * find an existing constraint to reparent to ours, or we create a new
11085 : * one.
11086 : */
11087 906 : for (int i = 0; i < pd->nparts; i++)
11088 : {
11089 424 : Relation partition = table_open(pd->oids[i], lockmode);
11090 : List *partFKs;
11091 : AttrMap *attmap;
11092 : AttrNumber mapped_fkattnum[INDEX_MAX_KEYS];
11093 : bool attached;
11094 : ObjectAddress address;
11095 :
11096 424 : CheckAlterTableIsSafe(partition);
11097 :
11098 418 : attmap = build_attrmap_by_name(RelationGetDescr(partition),
11099 : RelationGetDescr(rel),
11100 : false);
11101 1070 : for (int j = 0; j < numfks; j++)
11102 652 : mapped_fkattnum[j] = attmap->attnums[fkattnum[j] - 1];
11103 :
11104 : /* Check whether an existing constraint can be repurposed */
11105 418 : partFKs = copyObject(RelationGetFKeyList(partition));
11106 418 : attached = false;
11107 860 : foreach_node(ForeignKeyCacheInfo, fk, partFKs)
11108 : {
11109 36 : if (tryAttachPartitionForeignKey(wqueue,
11110 : fk,
11111 : partition,
11112 : parentConstr,
11113 : numfks,
11114 : mapped_fkattnum,
11115 : pkattnum,
11116 : pfeqoperators,
11117 : insertTriggerOid,
11118 : updateTriggerOid,
11119 : trigrel))
11120 : {
11121 12 : attached = true;
11122 12 : break;
11123 : }
11124 : }
11125 418 : if (attached)
11126 : {
11127 12 : table_close(partition, NoLock);
11128 12 : continue;
11129 : }
11130 :
11131 : /*
11132 : * No luck finding a good constraint to reuse; create our own.
11133 : */
11134 406 : address = addFkConstraint(addFkReferencingSide,
11135 : fkconstraint->conname, fkconstraint,
11136 : partition, pkrel, indexOid, parentConstr,
11137 : numfks, pkattnum,
11138 : mapped_fkattnum, pfeqoperators,
11139 : ppeqoperators, ffeqoperators,
11140 : numfkdelsetcols, fkdelsetcols, true,
11141 : with_period);
11142 :
11143 : /* call ourselves to finalize the creation and we're done */
11144 406 : addFkRecurseReferencing(wqueue, fkconstraint, partition, pkrel,
11145 : indexOid,
11146 : address.objectId,
11147 : numfks,
11148 : pkattnum,
11149 : mapped_fkattnum,
11150 : pfeqoperators,
11151 : ppeqoperators,
11152 : ffeqoperators,
11153 : numfkdelsetcols,
11154 : fkdelsetcols,
11155 : old_check_ok,
11156 : lockmode,
11157 : insertTriggerOid,
11158 : updateTriggerOid,
11159 : with_period);
11160 :
11161 406 : table_close(partition, NoLock);
11162 : }
11163 :
11164 482 : table_close(trigrel, RowExclusiveLock);
11165 : }
11166 2902 : }
11167 :
11168 : /*
11169 : * CloneForeignKeyConstraints
11170 : * Clone foreign keys from a partitioned table to a newly acquired
11171 : * partition.
11172 : *
11173 : * partitionRel is a partition of parentRel, so we can be certain that it has
11174 : * the same columns with the same datatypes. The columns may be in different
11175 : * order, though.
11176 : *
11177 : * wqueue must be passed to set up phase 3 constraint checking, unless the
11178 : * referencing-side partition is known to be empty (such as in CREATE TABLE /
11179 : * PARTITION OF).
11180 : */
11181 : static void
11182 9962 : CloneForeignKeyConstraints(List **wqueue, Relation parentRel,
11183 : Relation partitionRel)
11184 : {
11185 : /* This only works for declarative partitioning */
11186 : Assert(parentRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
11187 :
11188 : /*
11189 : * First, clone constraints where the parent is on the referencing side.
11190 : */
11191 9962 : CloneFkReferencing(wqueue, parentRel, partitionRel);
11192 :
11193 : /*
11194 : * Clone constraints for which the parent is on the referenced side.
11195 : */
11196 9944 : CloneFkReferenced(parentRel, partitionRel);
11197 9944 : }
11198 :
11199 : /*
11200 : * CloneFkReferenced
11201 : * Subroutine for CloneForeignKeyConstraints
11202 : *
11203 : * Find all the FKs that have the parent relation on the referenced side;
11204 : * clone those constraints to the given partition. This is to be called
11205 : * when the partition is being created or attached.
11206 : *
11207 : * This recurses to partitions, if the relation being attached is partitioned.
11208 : * Recursion is done by calling addFkRecurseReferenced.
11209 : */
11210 : static void
11211 9944 : CloneFkReferenced(Relation parentRel, Relation partitionRel)
11212 : {
11213 : Relation pg_constraint;
11214 : AttrMap *attmap;
11215 : ListCell *cell;
11216 : SysScanDesc scan;
11217 : ScanKeyData key[2];
11218 : HeapTuple tuple;
11219 9944 : List *clone = NIL;
11220 : Relation trigrel;
11221 :
11222 : /*
11223 : * Search for any constraints where this partition's parent is in the
11224 : * referenced side. However, we must not clone any constraint whose
11225 : * parent constraint is also going to be cloned, to avoid duplicates. So
11226 : * do it in two steps: first construct the list of constraints to clone,
11227 : * then go over that list cloning those whose parents are not in the list.
11228 : * (We must not rely on the parent being seen first, since the catalog
11229 : * scan could return children first.)
11230 : */
11231 9944 : pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11232 9944 : ScanKeyInit(&key[0],
11233 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
11234 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parentRel)));
11235 9944 : ScanKeyInit(&key[1],
11236 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
11237 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
11238 : /* This is a seqscan, as we don't have a usable index ... */
11239 9944 : scan = systable_beginscan(pg_constraint, InvalidOid, true,
11240 : NULL, 2, key);
11241 10334 : while ((tuple = systable_getnext(scan)) != NULL)
11242 : {
11243 390 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11244 :
11245 390 : clone = lappend_oid(clone, constrForm->oid);
11246 : }
11247 9944 : systable_endscan(scan);
11248 9944 : table_close(pg_constraint, RowShareLock);
11249 :
11250 : /*
11251 : * Triggers of the foreign keys will be manipulated a bunch of times in
11252 : * the loop below. To avoid repeatedly opening/closing the trigger
11253 : * catalog relation, we open it here and pass it to the subroutines called
11254 : * below.
11255 : */
11256 9944 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11257 :
11258 9944 : attmap = build_attrmap_by_name(RelationGetDescr(partitionRel),
11259 : RelationGetDescr(parentRel),
11260 : false);
11261 10334 : foreach(cell, clone)
11262 : {
11263 390 : Oid constrOid = lfirst_oid(cell);
11264 : Form_pg_constraint constrForm;
11265 : Relation fkRel;
11266 : Oid indexOid;
11267 : Oid partIndexId;
11268 : int numfks;
11269 : AttrNumber conkey[INDEX_MAX_KEYS];
11270 : AttrNumber mapped_confkey[INDEX_MAX_KEYS];
11271 : AttrNumber confkey[INDEX_MAX_KEYS];
11272 : Oid conpfeqop[INDEX_MAX_KEYS];
11273 : Oid conppeqop[INDEX_MAX_KEYS];
11274 : Oid conffeqop[INDEX_MAX_KEYS];
11275 : int numfkdelsetcols;
11276 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11277 : Constraint *fkconstraint;
11278 : ObjectAddress address;
11279 390 : Oid deleteTriggerOid = InvalidOid,
11280 390 : updateTriggerOid = InvalidOid;
11281 :
11282 390 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
11283 390 : if (!HeapTupleIsValid(tuple))
11284 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
11285 390 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11286 :
11287 : /*
11288 : * As explained above: don't try to clone a constraint for which we're
11289 : * going to clone the parent.
11290 : */
11291 390 : if (list_member_oid(clone, constrForm->conparentid))
11292 : {
11293 204 : ReleaseSysCache(tuple);
11294 204 : continue;
11295 : }
11296 :
11297 : /* We need the same lock level that CreateTrigger will acquire */
11298 186 : fkRel = table_open(constrForm->conrelid, ShareRowExclusiveLock);
11299 :
11300 186 : indexOid = constrForm->conindid;
11301 186 : DeconstructFkConstraintRow(tuple,
11302 : &numfks,
11303 : conkey,
11304 : confkey,
11305 : conpfeqop,
11306 : conppeqop,
11307 : conffeqop,
11308 : &numfkdelsetcols,
11309 : confdelsetcols);
11310 :
11311 378 : for (int i = 0; i < numfks; i++)
11312 192 : mapped_confkey[i] = attmap->attnums[confkey[i] - 1];
11313 :
11314 186 : fkconstraint = makeNode(Constraint);
11315 186 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11316 186 : fkconstraint->conname = NameStr(constrForm->conname);
11317 186 : fkconstraint->deferrable = constrForm->condeferrable;
11318 186 : fkconstraint->initdeferred = constrForm->condeferred;
11319 186 : fkconstraint->location = -1;
11320 186 : fkconstraint->pktable = NULL;
11321 : /* ->fk_attrs determined below */
11322 186 : fkconstraint->pk_attrs = NIL;
11323 186 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11324 186 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11325 186 : fkconstraint->fk_del_action = constrForm->confdeltype;
11326 186 : fkconstraint->fk_del_set_cols = NIL;
11327 186 : fkconstraint->old_conpfeqop = NIL;
11328 186 : fkconstraint->old_pktable_oid = InvalidOid;
11329 186 : fkconstraint->is_enforced = constrForm->conenforced;
11330 186 : fkconstraint->skip_validation = false;
11331 186 : fkconstraint->initially_valid = constrForm->convalidated;
11332 :
11333 : /* set up colnames that are used to generate the constraint name */
11334 378 : for (int i = 0; i < numfks; i++)
11335 : {
11336 : Form_pg_attribute att;
11337 :
11338 192 : att = TupleDescAttr(RelationGetDescr(fkRel),
11339 192 : conkey[i] - 1);
11340 192 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11341 192 : makeString(NameStr(att->attname)));
11342 : }
11343 :
11344 : /*
11345 : * Add the new foreign key constraint pointing to the new partition.
11346 : * Because this new partition appears in the referenced side of the
11347 : * constraint, we don't need to set up for Phase 3 check.
11348 : */
11349 186 : partIndexId = index_get_partition(partitionRel, indexOid);
11350 186 : if (!OidIsValid(partIndexId))
11351 0 : elog(ERROR, "index for %u not found in partition %s",
11352 : indexOid, RelationGetRelationName(partitionRel));
11353 :
11354 : /*
11355 : * Get the "action" triggers belonging to the constraint to pass as
11356 : * parent OIDs for similar triggers that will be created on the
11357 : * partition in addFkRecurseReferenced().
11358 : */
11359 186 : if (constrForm->conenforced)
11360 186 : GetForeignKeyActionTriggers(trigrel, constrOid,
11361 : constrForm->confrelid, constrForm->conrelid,
11362 : &deleteTriggerOid, &updateTriggerOid);
11363 :
11364 : /* Add this constraint ... */
11365 186 : address = addFkConstraint(addFkReferencedSide,
11366 : fkconstraint->conname, fkconstraint, fkRel,
11367 : partitionRel, partIndexId, constrOid,
11368 : numfks, mapped_confkey,
11369 : conkey, conpfeqop, conppeqop, conffeqop,
11370 : numfkdelsetcols, confdelsetcols, false,
11371 186 : constrForm->conperiod);
11372 : /* ... and recurse */
11373 186 : addFkRecurseReferenced(fkconstraint,
11374 : fkRel,
11375 : partitionRel,
11376 : partIndexId,
11377 : address.objectId,
11378 : numfks,
11379 : mapped_confkey,
11380 : conkey,
11381 : conpfeqop,
11382 : conppeqop,
11383 : conffeqop,
11384 : numfkdelsetcols,
11385 : confdelsetcols,
11386 : true,
11387 : deleteTriggerOid,
11388 : updateTriggerOid,
11389 186 : constrForm->conperiod);
11390 :
11391 186 : table_close(fkRel, NoLock);
11392 186 : ReleaseSysCache(tuple);
11393 : }
11394 :
11395 9944 : table_close(trigrel, RowExclusiveLock);
11396 9944 : }
11397 :
11398 : /*
11399 : * CloneFkReferencing
11400 : * Subroutine for CloneForeignKeyConstraints
11401 : *
11402 : * For each FK constraint of the parent relation in the given list, find an
11403 : * equivalent constraint in its partition relation that can be reparented;
11404 : * if one cannot be found, create a new constraint in the partition as its
11405 : * child.
11406 : *
11407 : * If wqueue is given, it is used to set up phase-3 verification for each
11408 : * cloned constraint; omit it if such verification is not needed
11409 : * (example: the partition is being created anew).
11410 : */
11411 : static void
11412 9962 : CloneFkReferencing(List **wqueue, Relation parentRel, Relation partRel)
11413 : {
11414 : AttrMap *attmap;
11415 : List *partFKs;
11416 9962 : List *clone = NIL;
11417 : ListCell *cell;
11418 : Relation trigrel;
11419 :
11420 : /* obtain a list of constraints that we need to clone */
11421 11242 : foreach(cell, RelationGetFKeyList(parentRel))
11422 : {
11423 1286 : ForeignKeyCacheInfo *fk = lfirst(cell);
11424 :
11425 : /*
11426 : * Refuse to attach a table as partition that this partitioned table
11427 : * already has a foreign key to. This isn't useful schema, which is
11428 : * proven by the fact that there have been no user complaints that
11429 : * it's already impossible to achieve this in the opposite direction,
11430 : * i.e., creating a foreign key that references a partition. This
11431 : * restriction allows us to dodge some complexities around
11432 : * pg_constraint and pg_trigger row creations that would be needed
11433 : * during ATTACH/DETACH for this kind of relationship.
11434 : */
11435 1286 : if (fk->confrelid == RelationGetRelid(partRel))
11436 6 : ereport(ERROR,
11437 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
11438 : errmsg("cannot attach table \"%s\" as a partition because it is referenced by foreign key \"%s\"",
11439 : RelationGetRelationName(partRel),
11440 : get_constraint_name(fk->conoid))));
11441 :
11442 1280 : clone = lappend_oid(clone, fk->conoid);
11443 : }
11444 :
11445 : /*
11446 : * Silently do nothing if there's nothing to do. In particular, this
11447 : * avoids throwing a spurious error for foreign tables.
11448 : */
11449 9956 : if (clone == NIL)
11450 9424 : return;
11451 :
11452 532 : if (partRel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
11453 0 : ereport(ERROR,
11454 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
11455 : errmsg("foreign key constraints are not supported on foreign tables")));
11456 :
11457 : /*
11458 : * Triggers of the foreign keys will be manipulated a bunch of times in
11459 : * the loop below. To avoid repeatedly opening/closing the trigger
11460 : * catalog relation, we open it here and pass it to the subroutines called
11461 : * below.
11462 : */
11463 532 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
11464 :
11465 : /*
11466 : * The constraint key may differ, if the columns in the partition are
11467 : * different. This map is used to convert them.
11468 : */
11469 532 : attmap = build_attrmap_by_name(RelationGetDescr(partRel),
11470 : RelationGetDescr(parentRel),
11471 : false);
11472 :
11473 532 : partFKs = copyObject(RelationGetFKeyList(partRel));
11474 :
11475 1800 : foreach(cell, clone)
11476 : {
11477 1280 : Oid parentConstrOid = lfirst_oid(cell);
11478 : Form_pg_constraint constrForm;
11479 : Relation pkrel;
11480 : HeapTuple tuple;
11481 : int numfks;
11482 : AttrNumber conkey[INDEX_MAX_KEYS];
11483 : AttrNumber mapped_conkey[INDEX_MAX_KEYS];
11484 : AttrNumber confkey[INDEX_MAX_KEYS];
11485 : Oid conpfeqop[INDEX_MAX_KEYS];
11486 : Oid conppeqop[INDEX_MAX_KEYS];
11487 : Oid conffeqop[INDEX_MAX_KEYS];
11488 : int numfkdelsetcols;
11489 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
11490 : Constraint *fkconstraint;
11491 : bool attached;
11492 : Oid indexOid;
11493 : ObjectAddress address;
11494 : ListCell *lc;
11495 1280 : Oid insertTriggerOid = InvalidOid,
11496 1280 : updateTriggerOid = InvalidOid;
11497 : bool with_period;
11498 :
11499 1280 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parentConstrOid));
11500 1280 : if (!HeapTupleIsValid(tuple))
11501 0 : elog(ERROR, "cache lookup failed for constraint %u",
11502 : parentConstrOid);
11503 1280 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
11504 :
11505 : /* Don't clone constraints whose parents are being cloned */
11506 1280 : if (list_member_oid(clone, constrForm->conparentid))
11507 : {
11508 712 : ReleaseSysCache(tuple);
11509 862 : continue;
11510 : }
11511 :
11512 : /*
11513 : * Need to prevent concurrent deletions. If pkrel is a partitioned
11514 : * relation, that means to lock all partitions.
11515 : */
11516 568 : pkrel = table_open(constrForm->confrelid, ShareRowExclusiveLock);
11517 568 : if (pkrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
11518 238 : (void) find_all_inheritors(RelationGetRelid(pkrel),
11519 : ShareRowExclusiveLock, NULL);
11520 :
11521 568 : DeconstructFkConstraintRow(tuple, &numfks, conkey, confkey,
11522 : conpfeqop, conppeqop, conffeqop,
11523 : &numfkdelsetcols, confdelsetcols);
11524 1358 : for (int i = 0; i < numfks; i++)
11525 790 : mapped_conkey[i] = attmap->attnums[conkey[i] - 1];
11526 :
11527 : /*
11528 : * Get the "check" triggers belonging to the constraint, if it is
11529 : * ENFORCED, to pass as parent OIDs for similar triggers that will be
11530 : * created on the partition in addFkRecurseReferencing(). They are
11531 : * also passed to tryAttachPartitionForeignKey() below to simply
11532 : * assign as parents to the partition's existing "check" triggers,
11533 : * that is, if the corresponding constraints is deemed attachable to
11534 : * the parent constraint.
11535 : */
11536 568 : if (constrForm->conenforced)
11537 556 : GetForeignKeyCheckTriggers(trigrel, constrForm->oid,
11538 : constrForm->confrelid, constrForm->conrelid,
11539 : &insertTriggerOid, &updateTriggerOid);
11540 :
11541 : /*
11542 : * Before creating a new constraint, see whether any existing FKs are
11543 : * fit for the purpose. If one is, attach the parent constraint to
11544 : * it, and don't clone anything. This way we avoid the expensive
11545 : * verification step and don't end up with a duplicate FK, and we
11546 : * don't need to recurse to partitions for this constraint.
11547 : */
11548 568 : attached = false;
11549 658 : foreach(lc, partFKs)
11550 : {
11551 246 : ForeignKeyCacheInfo *fk = lfirst_node(ForeignKeyCacheInfo, lc);
11552 :
11553 246 : if (tryAttachPartitionForeignKey(wqueue,
11554 : fk,
11555 : partRel,
11556 : parentConstrOid,
11557 : numfks,
11558 : mapped_conkey,
11559 : confkey,
11560 : conpfeqop,
11561 : insertTriggerOid,
11562 : updateTriggerOid,
11563 : trigrel))
11564 : {
11565 150 : attached = true;
11566 150 : table_close(pkrel, NoLock);
11567 150 : break;
11568 : }
11569 : }
11570 562 : if (attached)
11571 : {
11572 150 : ReleaseSysCache(tuple);
11573 150 : continue;
11574 : }
11575 :
11576 : /* No dice. Set up to create our own constraint */
11577 412 : fkconstraint = makeNode(Constraint);
11578 412 : fkconstraint->contype = CONSTRAINT_FOREIGN;
11579 : /* ->conname determined below */
11580 412 : fkconstraint->deferrable = constrForm->condeferrable;
11581 412 : fkconstraint->initdeferred = constrForm->condeferred;
11582 412 : fkconstraint->location = -1;
11583 412 : fkconstraint->pktable = NULL;
11584 : /* ->fk_attrs determined below */
11585 412 : fkconstraint->pk_attrs = NIL;
11586 412 : fkconstraint->fk_matchtype = constrForm->confmatchtype;
11587 412 : fkconstraint->fk_upd_action = constrForm->confupdtype;
11588 412 : fkconstraint->fk_del_action = constrForm->confdeltype;
11589 412 : fkconstraint->fk_del_set_cols = NIL;
11590 412 : fkconstraint->old_conpfeqop = NIL;
11591 412 : fkconstraint->old_pktable_oid = InvalidOid;
11592 412 : fkconstraint->is_enforced = constrForm->conenforced;
11593 412 : fkconstraint->skip_validation = false;
11594 412 : fkconstraint->initially_valid = constrForm->convalidated;
11595 932 : for (int i = 0; i < numfks; i++)
11596 : {
11597 : Form_pg_attribute att;
11598 :
11599 520 : att = TupleDescAttr(RelationGetDescr(partRel),
11600 520 : mapped_conkey[i] - 1);
11601 520 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
11602 520 : makeString(NameStr(att->attname)));
11603 : }
11604 :
11605 412 : indexOid = constrForm->conindid;
11606 412 : with_period = constrForm->conperiod;
11607 :
11608 : /* Create the pg_constraint entry at this level */
11609 412 : address = addFkConstraint(addFkReferencingSide,
11610 412 : NameStr(constrForm->conname), fkconstraint,
11611 : partRel, pkrel, indexOid, parentConstrOid,
11612 : numfks, confkey,
11613 : mapped_conkey, conpfeqop,
11614 : conppeqop, conffeqop,
11615 : numfkdelsetcols, confdelsetcols,
11616 : false, with_period);
11617 :
11618 : /* Done with the cloned constraint's tuple */
11619 412 : ReleaseSysCache(tuple);
11620 :
11621 : /* Create the check triggers, and recurse to partitions, if any */
11622 412 : addFkRecurseReferencing(wqueue,
11623 : fkconstraint,
11624 : partRel,
11625 : pkrel,
11626 : indexOid,
11627 : address.objectId,
11628 : numfks,
11629 : confkey,
11630 : mapped_conkey,
11631 : conpfeqop,
11632 : conppeqop,
11633 : conffeqop,
11634 : numfkdelsetcols,
11635 : confdelsetcols,
11636 : false, /* no old check exists */
11637 : AccessExclusiveLock,
11638 : insertTriggerOid,
11639 : updateTriggerOid,
11640 : with_period);
11641 406 : table_close(pkrel, NoLock);
11642 : }
11643 :
11644 520 : table_close(trigrel, RowExclusiveLock);
11645 : }
11646 :
11647 : /*
11648 : * When the parent of a partition receives [the referencing side of] a foreign
11649 : * key, we must propagate that foreign key to the partition. However, the
11650 : * partition might already have an equivalent foreign key; this routine
11651 : * compares the given ForeignKeyCacheInfo (in the partition) to the FK defined
11652 : * by the other parameters. If they are equivalent, create the link between
11653 : * the two constraints and return true.
11654 : *
11655 : * If the given FK does not match the one defined by rest of the params,
11656 : * return false.
11657 : */
11658 : static bool
11659 282 : tryAttachPartitionForeignKey(List **wqueue,
11660 : ForeignKeyCacheInfo *fk,
11661 : Relation partition,
11662 : Oid parentConstrOid,
11663 : int numfks,
11664 : AttrNumber *mapped_conkey,
11665 : AttrNumber *confkey,
11666 : Oid *conpfeqop,
11667 : Oid parentInsTrigger,
11668 : Oid parentUpdTrigger,
11669 : Relation trigrel)
11670 : {
11671 : HeapTuple parentConstrTup;
11672 : Form_pg_constraint parentConstr;
11673 : HeapTuple partcontup;
11674 : Form_pg_constraint partConstr;
11675 :
11676 282 : parentConstrTup = SearchSysCache1(CONSTROID,
11677 : ObjectIdGetDatum(parentConstrOid));
11678 282 : if (!HeapTupleIsValid(parentConstrTup))
11679 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11680 282 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11681 :
11682 : /*
11683 : * Do some quick & easy initial checks. If any of these fail, we cannot
11684 : * use this constraint.
11685 : */
11686 282 : if (fk->confrelid != parentConstr->confrelid || fk->nkeys != numfks)
11687 : {
11688 0 : ReleaseSysCache(parentConstrTup);
11689 0 : return false;
11690 : }
11691 786 : for (int i = 0; i < numfks; i++)
11692 : {
11693 504 : if (fk->conkey[i] != mapped_conkey[i] ||
11694 504 : fk->confkey[i] != confkey[i] ||
11695 504 : fk->conpfeqop[i] != conpfeqop[i])
11696 : {
11697 0 : ReleaseSysCache(parentConstrTup);
11698 0 : return false;
11699 : }
11700 : }
11701 :
11702 : /* Looks good so far; perform more extensive checks. */
11703 282 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
11704 282 : if (!HeapTupleIsValid(partcontup))
11705 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
11706 282 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11707 :
11708 : /*
11709 : * An error should be raised if the constraint enforceability is
11710 : * different. Returning false without raising an error, as we do for other
11711 : * attributes, could lead to a duplicate constraint with the same
11712 : * enforceability as the parent. While this may be acceptable, it may not
11713 : * be ideal. Therefore, it's better to raise an error and allow the user
11714 : * to correct the enforceability before proceeding.
11715 : */
11716 282 : if (partConstr->conenforced != parentConstr->conenforced)
11717 6 : ereport(ERROR,
11718 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
11719 : errmsg("constraint \"%s\" enforceability conflicts with constraint \"%s\" on relation \"%s\"",
11720 : NameStr(parentConstr->conname),
11721 : NameStr(partConstr->conname),
11722 : RelationGetRelationName(partition))));
11723 :
11724 276 : if (OidIsValid(partConstr->conparentid) ||
11725 240 : partConstr->condeferrable != parentConstr->condeferrable ||
11726 212 : partConstr->condeferred != parentConstr->condeferred ||
11727 212 : partConstr->confupdtype != parentConstr->confupdtype ||
11728 176 : partConstr->confdeltype != parentConstr->confdeltype ||
11729 176 : partConstr->confmatchtype != parentConstr->confmatchtype)
11730 : {
11731 114 : ReleaseSysCache(parentConstrTup);
11732 114 : ReleaseSysCache(partcontup);
11733 114 : return false;
11734 : }
11735 :
11736 162 : ReleaseSysCache(parentConstrTup);
11737 162 : ReleaseSysCache(partcontup);
11738 :
11739 : /* Looks good! Attach this constraint. */
11740 162 : AttachPartitionForeignKey(wqueue, partition, fk->conoid,
11741 : parentConstrOid, parentInsTrigger,
11742 : parentUpdTrigger, trigrel);
11743 :
11744 162 : return true;
11745 : }
11746 :
11747 : /*
11748 : * AttachPartitionForeignKey
11749 : *
11750 : * The subroutine for tryAttachPartitionForeignKey performs the final tasks of
11751 : * attaching the constraint, removing redundant triggers and entries from
11752 : * pg_constraint, and setting the constraint's parent.
11753 : */
11754 : static void
11755 162 : AttachPartitionForeignKey(List **wqueue,
11756 : Relation partition,
11757 : Oid partConstrOid,
11758 : Oid parentConstrOid,
11759 : Oid parentInsTrigger,
11760 : Oid parentUpdTrigger,
11761 : Relation trigrel)
11762 : {
11763 : HeapTuple parentConstrTup;
11764 : Form_pg_constraint parentConstr;
11765 : HeapTuple partcontup;
11766 : Form_pg_constraint partConstr;
11767 : bool queueValidation;
11768 : Oid partConstrFrelid;
11769 : Oid partConstrRelid;
11770 : bool parentConstrIsEnforced;
11771 :
11772 : /* Fetch the parent constraint tuple */
11773 162 : parentConstrTup = SearchSysCache1(CONSTROID,
11774 : ObjectIdGetDatum(parentConstrOid));
11775 162 : if (!HeapTupleIsValid(parentConstrTup))
11776 0 : elog(ERROR, "cache lookup failed for constraint %u", parentConstrOid);
11777 162 : parentConstr = (Form_pg_constraint) GETSTRUCT(parentConstrTup);
11778 162 : parentConstrIsEnforced = parentConstr->conenforced;
11779 :
11780 : /* Fetch the child constraint tuple */
11781 162 : partcontup = SearchSysCache1(CONSTROID,
11782 : ObjectIdGetDatum(partConstrOid));
11783 162 : if (!HeapTupleIsValid(partcontup))
11784 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11785 162 : partConstr = (Form_pg_constraint) GETSTRUCT(partcontup);
11786 162 : partConstrFrelid = partConstr->confrelid;
11787 162 : partConstrRelid = partConstr->conrelid;
11788 :
11789 : /*
11790 : * If the referenced table is partitioned, then the partition we're
11791 : * attaching now has extra pg_constraint rows and action triggers that are
11792 : * no longer needed. Remove those.
11793 : */
11794 162 : if (get_rel_relkind(partConstrFrelid) == RELKIND_PARTITIONED_TABLE)
11795 : {
11796 36 : Relation pg_constraint = table_open(ConstraintRelationId, RowShareLock);
11797 :
11798 36 : RemoveInheritedConstraint(pg_constraint, trigrel, partConstrOid,
11799 : partConstrRelid);
11800 :
11801 36 : table_close(pg_constraint, RowShareLock);
11802 : }
11803 :
11804 : /*
11805 : * Will we need to validate this constraint? A valid parent constraint
11806 : * implies that all child constraints have been validated, so if this one
11807 : * isn't, we must trigger phase 3 validation.
11808 : */
11809 162 : queueValidation = parentConstr->convalidated && !partConstr->convalidated;
11810 :
11811 162 : ReleaseSysCache(partcontup);
11812 162 : ReleaseSysCache(parentConstrTup);
11813 :
11814 : /*
11815 : * The action triggers in the new partition become redundant -- the parent
11816 : * table already has equivalent ones, and those will be able to reach the
11817 : * partition. Remove the ones in the partition. We identify them because
11818 : * they have our constraint OID, as well as being on the referenced rel.
11819 : */
11820 162 : DropForeignKeyConstraintTriggers(trigrel, partConstrOid, partConstrFrelid,
11821 : partConstrRelid);
11822 :
11823 162 : ConstraintSetParentConstraint(partConstrOid, parentConstrOid,
11824 : RelationGetRelid(partition));
11825 :
11826 : /*
11827 : * Like the constraint, attach partition's "check" triggers to the
11828 : * corresponding parent triggers if the constraint is ENFORCED. NOT
11829 : * ENFORCED constraints do not have these triggers.
11830 : */
11831 162 : if (parentConstrIsEnforced)
11832 : {
11833 : Oid insertTriggerOid,
11834 : updateTriggerOid;
11835 :
11836 150 : GetForeignKeyCheckTriggers(trigrel,
11837 : partConstrOid, partConstrFrelid, partConstrRelid,
11838 : &insertTriggerOid, &updateTriggerOid);
11839 : Assert(OidIsValid(insertTriggerOid) && OidIsValid(parentInsTrigger));
11840 150 : TriggerSetParentTrigger(trigrel, insertTriggerOid, parentInsTrigger,
11841 : RelationGetRelid(partition));
11842 : Assert(OidIsValid(updateTriggerOid) && OidIsValid(parentUpdTrigger));
11843 150 : TriggerSetParentTrigger(trigrel, updateTriggerOid, parentUpdTrigger,
11844 : RelationGetRelid(partition));
11845 : }
11846 :
11847 : /*
11848 : * We updated this pg_constraint row above to set its parent; validating
11849 : * it will cause its convalidated flag to change, so we need CCI here. In
11850 : * addition, we need it unconditionally for the rare case where the parent
11851 : * table has *two* identical constraints; when reaching this function for
11852 : * the second one, we must have made our changes visible, otherwise we
11853 : * would try to attach both to this one.
11854 : */
11855 162 : CommandCounterIncrement();
11856 :
11857 : /* If validation is needed, put it in the queue now. */
11858 162 : if (queueValidation)
11859 : {
11860 : Relation conrel;
11861 :
11862 18 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
11863 :
11864 18 : partcontup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(partConstrOid));
11865 18 : if (!HeapTupleIsValid(partcontup))
11866 0 : elog(ERROR, "cache lookup failed for constraint %u", partConstrOid);
11867 :
11868 : /* Use the same lock as for AT_ValidateConstraint */
11869 18 : QueueFKConstraintValidation(wqueue, conrel, partition, partcontup,
11870 : ShareUpdateExclusiveLock);
11871 18 : ReleaseSysCache(partcontup);
11872 18 : table_close(conrel, RowExclusiveLock);
11873 : }
11874 162 : }
11875 :
11876 : /*
11877 : * RemoveInheritedConstraint
11878 : *
11879 : * Removes the constraint and its associated trigger from the specified
11880 : * relation, which inherited the given constraint.
11881 : */
11882 : static void
11883 36 : RemoveInheritedConstraint(Relation conrel, Relation trigrel, Oid conoid,
11884 : Oid conrelid)
11885 : {
11886 : ObjectAddresses *objs;
11887 : HeapTuple consttup;
11888 : ScanKeyData key;
11889 : SysScanDesc scan;
11890 : HeapTuple trigtup;
11891 :
11892 36 : ScanKeyInit(&key,
11893 : Anum_pg_constraint_conrelid,
11894 : BTEqualStrategyNumber, F_OIDEQ,
11895 : ObjectIdGetDatum(conrelid));
11896 :
11897 36 : scan = systable_beginscan(conrel,
11898 : ConstraintRelidTypidNameIndexId,
11899 : true, NULL, 1, &key);
11900 36 : objs = new_object_addresses();
11901 324 : while ((consttup = systable_getnext(scan)) != NULL)
11902 : {
11903 288 : Form_pg_constraint conform = (Form_pg_constraint) GETSTRUCT(consttup);
11904 :
11905 288 : if (conform->conparentid != conoid)
11906 210 : continue;
11907 : else
11908 : {
11909 : ObjectAddress addr;
11910 : SysScanDesc scan2;
11911 : ScanKeyData key2;
11912 : int n PG_USED_FOR_ASSERTS_ONLY;
11913 :
11914 78 : ObjectAddressSet(addr, ConstraintRelationId, conform->oid);
11915 78 : add_exact_object_address(&addr, objs);
11916 :
11917 : /*
11918 : * First we must delete the dependency record that binds the
11919 : * constraint records together.
11920 : */
11921 78 : n = deleteDependencyRecordsForSpecific(ConstraintRelationId,
11922 : conform->oid,
11923 : DEPENDENCY_INTERNAL,
11924 : ConstraintRelationId,
11925 : conoid);
11926 : Assert(n == 1); /* actually only one is expected */
11927 :
11928 : /*
11929 : * Now search for the triggers for this constraint and set them up
11930 : * for deletion too
11931 : */
11932 78 : ScanKeyInit(&key2,
11933 : Anum_pg_trigger_tgconstraint,
11934 : BTEqualStrategyNumber, F_OIDEQ,
11935 : ObjectIdGetDatum(conform->oid));
11936 78 : scan2 = systable_beginscan(trigrel, TriggerConstraintIndexId,
11937 : true, NULL, 1, &key2);
11938 234 : while ((trigtup = systable_getnext(scan2)) != NULL)
11939 : {
11940 156 : ObjectAddressSet(addr, TriggerRelationId,
11941 : ((Form_pg_trigger) GETSTRUCT(trigtup))->oid);
11942 156 : add_exact_object_address(&addr, objs);
11943 : }
11944 78 : systable_endscan(scan2);
11945 : }
11946 : }
11947 : /* make the dependency deletions visible */
11948 36 : CommandCounterIncrement();
11949 36 : performMultipleDeletions(objs, DROP_RESTRICT,
11950 : PERFORM_DELETION_INTERNAL);
11951 36 : systable_endscan(scan);
11952 36 : }
11953 :
11954 : /*
11955 : * DropForeignKeyConstraintTriggers
11956 : *
11957 : * The subroutine for tryAttachPartitionForeignKey handles the deletion of
11958 : * action triggers for the foreign key constraint.
11959 : *
11960 : * If valid confrelid and conrelid values are not provided, the respective
11961 : * trigger check will be skipped, and the trigger will be considered for
11962 : * removal.
11963 : */
11964 : static void
11965 234 : DropForeignKeyConstraintTriggers(Relation trigrel, Oid conoid, Oid confrelid,
11966 : Oid conrelid)
11967 : {
11968 : ScanKeyData key;
11969 : SysScanDesc scan;
11970 : HeapTuple trigtup;
11971 :
11972 234 : ScanKeyInit(&key,
11973 : Anum_pg_trigger_tgconstraint,
11974 : BTEqualStrategyNumber, F_OIDEQ,
11975 : ObjectIdGetDatum(conoid));
11976 234 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
11977 : NULL, 1, &key);
11978 1014 : while ((trigtup = systable_getnext(scan)) != NULL)
11979 : {
11980 780 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
11981 : ObjectAddress trigger;
11982 :
11983 : /* Invalid if trigger is not for a referential integrity constraint */
11984 780 : if (!OidIsValid(trgform->tgconstrrelid))
11985 300 : continue;
11986 780 : if (OidIsValid(conrelid) && trgform->tgconstrrelid != conrelid)
11987 300 : continue;
11988 480 : if (OidIsValid(confrelid) && trgform->tgrelid != confrelid)
11989 0 : continue;
11990 :
11991 : /* We should be dropping trigger related to foreign key constraint */
11992 : Assert(trgform->tgfoid == F_RI_FKEY_CHECK_INS ||
11993 : trgform->tgfoid == F_RI_FKEY_CHECK_UPD ||
11994 : trgform->tgfoid == F_RI_FKEY_CASCADE_DEL ||
11995 : trgform->tgfoid == F_RI_FKEY_CASCADE_UPD ||
11996 : trgform->tgfoid == F_RI_FKEY_RESTRICT_DEL ||
11997 : trgform->tgfoid == F_RI_FKEY_RESTRICT_UPD ||
11998 : trgform->tgfoid == F_RI_FKEY_SETNULL_DEL ||
11999 : trgform->tgfoid == F_RI_FKEY_SETNULL_UPD ||
12000 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_DEL ||
12001 : trgform->tgfoid == F_RI_FKEY_SETDEFAULT_UPD ||
12002 : trgform->tgfoid == F_RI_FKEY_NOACTION_DEL ||
12003 : trgform->tgfoid == F_RI_FKEY_NOACTION_UPD);
12004 :
12005 : /*
12006 : * The constraint is originally set up to contain this trigger as an
12007 : * implementation object, so there's a dependency record that links
12008 : * the two; however, since the trigger is no longer needed, we remove
12009 : * the dependency link in order to be able to drop the trigger while
12010 : * keeping the constraint intact.
12011 : */
12012 480 : deleteDependencyRecordsFor(TriggerRelationId,
12013 : trgform->oid,
12014 : false);
12015 : /* make dependency deletion visible to performDeletion */
12016 480 : CommandCounterIncrement();
12017 480 : ObjectAddressSet(trigger, TriggerRelationId,
12018 : trgform->oid);
12019 480 : performDeletion(&trigger, DROP_RESTRICT, 0);
12020 : /* make trigger drop visible, in case the loop iterates */
12021 480 : CommandCounterIncrement();
12022 : }
12023 :
12024 234 : systable_endscan(scan);
12025 234 : }
12026 :
12027 : /*
12028 : * GetForeignKeyActionTriggers
12029 : * Returns delete and update "action" triggers of the given relation
12030 : * belonging to the given constraint
12031 : */
12032 : static void
12033 186 : GetForeignKeyActionTriggers(Relation trigrel,
12034 : Oid conoid, Oid confrelid, Oid conrelid,
12035 : Oid *deleteTriggerOid,
12036 : Oid *updateTriggerOid)
12037 : {
12038 : ScanKeyData key;
12039 : SysScanDesc scan;
12040 : HeapTuple trigtup;
12041 :
12042 186 : *deleteTriggerOid = *updateTriggerOid = InvalidOid;
12043 186 : ScanKeyInit(&key,
12044 : Anum_pg_trigger_tgconstraint,
12045 : BTEqualStrategyNumber, F_OIDEQ,
12046 : ObjectIdGetDatum(conoid));
12047 :
12048 186 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12049 : NULL, 1, &key);
12050 394 : while ((trigtup = systable_getnext(scan)) != NULL)
12051 : {
12052 394 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12053 :
12054 394 : if (trgform->tgconstrrelid != conrelid)
12055 18 : continue;
12056 376 : if (trgform->tgrelid != confrelid)
12057 0 : continue;
12058 : /* Only ever look at "action" triggers on the PK side. */
12059 376 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_PK)
12060 4 : continue;
12061 372 : if (TRIGGER_FOR_DELETE(trgform->tgtype))
12062 : {
12063 : Assert(*deleteTriggerOid == InvalidOid);
12064 186 : *deleteTriggerOid = trgform->oid;
12065 : }
12066 186 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12067 : {
12068 : Assert(*updateTriggerOid == InvalidOid);
12069 186 : *updateTriggerOid = trgform->oid;
12070 : }
12071 : #ifndef USE_ASSERT_CHECKING
12072 : /* In an assert-enabled build, continue looking to find duplicates */
12073 372 : if (OidIsValid(*deleteTriggerOid) && OidIsValid(*updateTriggerOid))
12074 186 : break;
12075 : #endif
12076 : }
12077 :
12078 186 : if (!OidIsValid(*deleteTriggerOid))
12079 0 : elog(ERROR, "could not find ON DELETE action trigger of foreign key constraint %u",
12080 : conoid);
12081 186 : if (!OidIsValid(*updateTriggerOid))
12082 0 : elog(ERROR, "could not find ON UPDATE action trigger of foreign key constraint %u",
12083 : conoid);
12084 :
12085 186 : systable_endscan(scan);
12086 186 : }
12087 :
12088 : /*
12089 : * GetForeignKeyCheckTriggers
12090 : * Returns insert and update "check" triggers of the given relation
12091 : * belonging to the given constraint
12092 : */
12093 : static void
12094 808 : GetForeignKeyCheckTriggers(Relation trigrel,
12095 : Oid conoid, Oid confrelid, Oid conrelid,
12096 : Oid *insertTriggerOid,
12097 : Oid *updateTriggerOid)
12098 : {
12099 : ScanKeyData key;
12100 : SysScanDesc scan;
12101 : HeapTuple trigtup;
12102 :
12103 808 : *insertTriggerOid = *updateTriggerOid = InvalidOid;
12104 808 : ScanKeyInit(&key,
12105 : Anum_pg_trigger_tgconstraint,
12106 : BTEqualStrategyNumber, F_OIDEQ,
12107 : ObjectIdGetDatum(conoid));
12108 :
12109 808 : scan = systable_beginscan(trigrel, TriggerConstraintIndexId, true,
12110 : NULL, 1, &key);
12111 2600 : while ((trigtup = systable_getnext(scan)) != NULL)
12112 : {
12113 2600 : Form_pg_trigger trgform = (Form_pg_trigger) GETSTRUCT(trigtup);
12114 :
12115 2600 : if (trgform->tgconstrrelid != confrelid)
12116 890 : continue;
12117 1710 : if (trgform->tgrelid != conrelid)
12118 0 : continue;
12119 : /* Only ever look at "check" triggers on the FK side. */
12120 1710 : if (RI_FKey_trigger_type(trgform->tgfoid) != RI_TRIGGER_FK)
12121 94 : continue;
12122 1616 : if (TRIGGER_FOR_INSERT(trgform->tgtype))
12123 : {
12124 : Assert(*insertTriggerOid == InvalidOid);
12125 808 : *insertTriggerOid = trgform->oid;
12126 : }
12127 808 : else if (TRIGGER_FOR_UPDATE(trgform->tgtype))
12128 : {
12129 : Assert(*updateTriggerOid == InvalidOid);
12130 808 : *updateTriggerOid = trgform->oid;
12131 : }
12132 : #ifndef USE_ASSERT_CHECKING
12133 : /* In an assert-enabled build, continue looking to find duplicates. */
12134 1616 : if (OidIsValid(*insertTriggerOid) && OidIsValid(*updateTriggerOid))
12135 808 : break;
12136 : #endif
12137 : }
12138 :
12139 808 : if (!OidIsValid(*insertTriggerOid))
12140 0 : elog(ERROR, "could not find ON INSERT check triggers of foreign key constraint %u",
12141 : conoid);
12142 808 : if (!OidIsValid(*updateTriggerOid))
12143 0 : elog(ERROR, "could not find ON UPDATE check triggers of foreign key constraint %u",
12144 : conoid);
12145 :
12146 808 : systable_endscan(scan);
12147 808 : }
12148 :
12149 : /*
12150 : * ALTER TABLE ALTER CONSTRAINT
12151 : *
12152 : * Update the attributes of a constraint.
12153 : *
12154 : * Currently only works for Foreign Key and not null constraints.
12155 : *
12156 : * If the constraint is modified, returns its address; otherwise, return
12157 : * InvalidObjectAddress.
12158 : */
12159 : static ObjectAddress
12160 282 : ATExecAlterConstraint(List **wqueue, Relation rel, ATAlterConstraint *cmdcon,
12161 : bool recurse, LOCKMODE lockmode)
12162 : {
12163 : Relation conrel;
12164 : Relation tgrel;
12165 : SysScanDesc scan;
12166 : ScanKeyData skey[3];
12167 : HeapTuple contuple;
12168 : Form_pg_constraint currcon;
12169 : ObjectAddress address;
12170 :
12171 : /*
12172 : * Disallow altering ONLY a partitioned table, as it would make no sense.
12173 : * This is okay for legacy inheritance.
12174 : */
12175 282 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE && !recurse)
12176 0 : ereport(ERROR,
12177 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
12178 : errmsg("constraint must be altered in child tables too"),
12179 : errhint("Do not specify the ONLY keyword."));
12180 :
12181 :
12182 282 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12183 282 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
12184 :
12185 : /*
12186 : * Find and check the target constraint
12187 : */
12188 282 : ScanKeyInit(&skey[0],
12189 : Anum_pg_constraint_conrelid,
12190 : BTEqualStrategyNumber, F_OIDEQ,
12191 : ObjectIdGetDatum(RelationGetRelid(rel)));
12192 282 : ScanKeyInit(&skey[1],
12193 : Anum_pg_constraint_contypid,
12194 : BTEqualStrategyNumber, F_OIDEQ,
12195 : ObjectIdGetDatum(InvalidOid));
12196 282 : ScanKeyInit(&skey[2],
12197 : Anum_pg_constraint_conname,
12198 : BTEqualStrategyNumber, F_NAMEEQ,
12199 282 : CStringGetDatum(cmdcon->conname));
12200 282 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12201 : true, NULL, 3, skey);
12202 :
12203 : /* There can be at most one matching row */
12204 282 : if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
12205 6 : ereport(ERROR,
12206 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12207 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12208 : cmdcon->conname, RelationGetRelationName(rel))));
12209 :
12210 276 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12211 276 : if (cmdcon->alterDeferrability && currcon->contype != CONSTRAINT_FOREIGN)
12212 0 : ereport(ERROR,
12213 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12214 : errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key constraint",
12215 : cmdcon->conname, RelationGetRelationName(rel))));
12216 276 : if (cmdcon->alterEnforceability && currcon->contype != CONSTRAINT_FOREIGN)
12217 12 : ereport(ERROR,
12218 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
12219 : errmsg("cannot alter enforceability of constraint \"%s\" of relation \"%s\"",
12220 : cmdcon->conname, RelationGetRelationName(rel))));
12221 264 : if (cmdcon->alterInheritability &&
12222 90 : currcon->contype != CONSTRAINT_NOTNULL)
12223 24 : ereport(ERROR,
12224 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12225 : errmsg("constraint \"%s\" of relation \"%s\" is not a not-null constraint",
12226 : cmdcon->conname, RelationGetRelationName(rel)));
12227 :
12228 : /* Refuse to modify inheritability of inherited constraints */
12229 240 : if (cmdcon->alterInheritability &&
12230 66 : cmdcon->noinherit && currcon->coninhcount > 0)
12231 6 : ereport(ERROR,
12232 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12233 : errmsg("cannot alter inherited constraint \"%s\" on relation \"%s\"",
12234 : NameStr(currcon->conname),
12235 : RelationGetRelationName(rel)));
12236 :
12237 : /*
12238 : * If it's not the topmost constraint, raise an error.
12239 : *
12240 : * Altering a non-topmost constraint leaves some triggers untouched, since
12241 : * they are not directly connected to this constraint; also, pg_dump would
12242 : * ignore the deferrability status of the individual constraint, since it
12243 : * only dumps topmost constraints. Avoid these problems by refusing this
12244 : * operation and telling the user to alter the parent constraint instead.
12245 : */
12246 234 : if (OidIsValid(currcon->conparentid))
12247 : {
12248 : HeapTuple tp;
12249 12 : Oid parent = currcon->conparentid;
12250 12 : char *ancestorname = NULL;
12251 12 : char *ancestortable = NULL;
12252 :
12253 : /* Loop to find the topmost constraint */
12254 24 : while (HeapTupleIsValid(tp = SearchSysCache1(CONSTROID, ObjectIdGetDatum(parent))))
12255 : {
12256 24 : Form_pg_constraint contup = (Form_pg_constraint) GETSTRUCT(tp);
12257 :
12258 : /* If no parent, this is the constraint we want */
12259 24 : if (!OidIsValid(contup->conparentid))
12260 : {
12261 12 : ancestorname = pstrdup(NameStr(contup->conname));
12262 12 : ancestortable = get_rel_name(contup->conrelid);
12263 12 : ReleaseSysCache(tp);
12264 12 : break;
12265 : }
12266 :
12267 12 : parent = contup->conparentid;
12268 12 : ReleaseSysCache(tp);
12269 : }
12270 :
12271 12 : ereport(ERROR,
12272 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12273 : errmsg("cannot alter constraint \"%s\" on relation \"%s\"",
12274 : cmdcon->conname, RelationGetRelationName(rel)),
12275 : ancestorname && ancestortable ?
12276 : errdetail("Constraint \"%s\" is derived from constraint \"%s\" of relation \"%s\".",
12277 : cmdcon->conname, ancestorname, ancestortable) : 0,
12278 : errhint("You may alter the constraint it derives from instead.")));
12279 : }
12280 :
12281 222 : address = InvalidObjectAddress;
12282 :
12283 : /*
12284 : * Do the actual catalog work, and recurse if necessary.
12285 : */
12286 222 : if (ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, rel,
12287 : contuple, recurse, lockmode))
12288 210 : ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
12289 :
12290 216 : systable_endscan(scan);
12291 :
12292 216 : table_close(tgrel, RowExclusiveLock);
12293 216 : table_close(conrel, RowExclusiveLock);
12294 :
12295 216 : return address;
12296 : }
12297 :
12298 : /*
12299 : * A subroutine of ATExecAlterConstraint that calls the respective routines for
12300 : * altering constraint's enforceability, deferrability or inheritability.
12301 : */
12302 : static bool
12303 222 : ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon,
12304 : Relation conrel, Relation tgrel, Relation rel,
12305 : HeapTuple contuple, bool recurse,
12306 : LOCKMODE lockmode)
12307 : {
12308 : Form_pg_constraint currcon;
12309 222 : bool changed = false;
12310 222 : List *otherrelids = NIL;
12311 :
12312 222 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12313 :
12314 : /*
12315 : * Do the catalog work for the enforceability or deferrability change,
12316 : * recurse if necessary.
12317 : *
12318 : * Note that even if deferrability is requested to be altered along with
12319 : * enforceability, we don't need to explicitly update multiple entries in
12320 : * pg_trigger related to deferrability.
12321 : *
12322 : * Modifying enforceability involves either creating or dropping the
12323 : * trigger, during which the deferrability setting will be adjusted
12324 : * automatically.
12325 : */
12326 288 : if (cmdcon->alterEnforceability &&
12327 66 : ATExecAlterConstrEnforceability(wqueue, cmdcon, conrel, tgrel,
12328 : currcon->conrelid, currcon->confrelid,
12329 : contuple, lockmode, InvalidOid,
12330 : InvalidOid, InvalidOid, InvalidOid))
12331 60 : changed = true;
12332 :
12333 258 : else if (cmdcon->alterDeferrability &&
12334 96 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, rel,
12335 : contuple, recurse, &otherrelids,
12336 : lockmode))
12337 : {
12338 : /*
12339 : * AlterConstrUpdateConstraintEntry already invalidated relcache for
12340 : * the relations having the constraint itself; here we also invalidate
12341 : * for relations that have any triggers that are part of the
12342 : * constraint.
12343 : */
12344 306 : foreach_oid(relid, otherrelids)
12345 114 : CacheInvalidateRelcacheByRelid(relid);
12346 :
12347 96 : changed = true;
12348 : }
12349 :
12350 : /*
12351 : * Do the catalog work for the inheritability change.
12352 : */
12353 276 : if (cmdcon->alterInheritability &&
12354 60 : ATExecAlterConstrInheritability(wqueue, cmdcon, conrel, rel, contuple,
12355 : lockmode))
12356 54 : changed = true;
12357 :
12358 216 : return changed;
12359 : }
12360 :
12361 : /*
12362 : * Returns true if the constraint's enforceability is altered.
12363 : *
12364 : * Depending on whether the constraint is being set to ENFORCED or NOT
12365 : * ENFORCED, it creates or drops the trigger accordingly.
12366 : *
12367 : * Note that we must recurse even when trying to change a constraint to not
12368 : * enforced if it is already not enforced, in case descendant constraints
12369 : * might be enforced and need to be changed to not enforced. Conversely, we
12370 : * should do nothing if a constraint is being set to enforced and is already
12371 : * enforced, as descendant constraints cannot be different in that case.
12372 : */
12373 : static bool
12374 150 : ATExecAlterConstrEnforceability(List **wqueue, ATAlterConstraint *cmdcon,
12375 : Relation conrel, Relation tgrel,
12376 : Oid fkrelid, Oid pkrelid,
12377 : HeapTuple contuple, LOCKMODE lockmode,
12378 : Oid ReferencedParentDelTrigger,
12379 : Oid ReferencedParentUpdTrigger,
12380 : Oid ReferencingParentInsTrigger,
12381 : Oid ReferencingParentUpdTrigger)
12382 : {
12383 : Form_pg_constraint currcon;
12384 : Oid conoid;
12385 : Relation rel;
12386 150 : bool changed = false;
12387 :
12388 : /* Since this function recurses, it could be driven to stack overflow */
12389 150 : check_stack_depth();
12390 :
12391 : Assert(cmdcon->alterEnforceability);
12392 :
12393 150 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12394 150 : conoid = currcon->oid;
12395 :
12396 : /* Should be foreign key constraint */
12397 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12398 :
12399 150 : rel = table_open(currcon->conrelid, lockmode);
12400 :
12401 150 : if (currcon->conenforced != cmdcon->is_enforced)
12402 : {
12403 144 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12404 144 : changed = true;
12405 : }
12406 :
12407 : /* Drop triggers */
12408 150 : if (!cmdcon->is_enforced)
12409 : {
12410 : /*
12411 : * When setting a constraint to NOT ENFORCED, the constraint triggers
12412 : * need to be dropped. Therefore, we must process the child relations
12413 : * first, followed by the parent, to account for dependencies.
12414 : */
12415 126 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12416 54 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12417 18 : AlterConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12418 : fkrelid, pkrelid, contuple,
12419 : lockmode, InvalidOid, InvalidOid,
12420 : InvalidOid, InvalidOid);
12421 :
12422 : /* Drop all the triggers */
12423 72 : DropForeignKeyConstraintTriggers(tgrel, conoid, InvalidOid, InvalidOid);
12424 : }
12425 78 : else if (changed) /* Create triggers */
12426 : {
12427 78 : Oid ReferencedDelTriggerOid = InvalidOid,
12428 78 : ReferencedUpdTriggerOid = InvalidOid,
12429 78 : ReferencingInsTriggerOid = InvalidOid,
12430 78 : ReferencingUpdTriggerOid = InvalidOid;
12431 :
12432 : /* Prepare the minimal information required for trigger creation. */
12433 78 : Constraint *fkconstraint = makeNode(Constraint);
12434 :
12435 78 : fkconstraint->conname = pstrdup(NameStr(currcon->conname));
12436 78 : fkconstraint->fk_matchtype = currcon->confmatchtype;
12437 78 : fkconstraint->fk_upd_action = currcon->confupdtype;
12438 78 : fkconstraint->fk_del_action = currcon->confdeltype;
12439 :
12440 : /* Create referenced triggers */
12441 78 : if (currcon->conrelid == fkrelid)
12442 36 : createForeignKeyActionTriggers(currcon->conrelid,
12443 : currcon->confrelid,
12444 : fkconstraint,
12445 : conoid,
12446 : currcon->conindid,
12447 : ReferencedParentDelTrigger,
12448 : ReferencedParentUpdTrigger,
12449 : &ReferencedDelTriggerOid,
12450 : &ReferencedUpdTriggerOid);
12451 :
12452 : /* Create referencing triggers */
12453 78 : if (currcon->confrelid == pkrelid)
12454 78 : createForeignKeyCheckTriggers(currcon->conrelid,
12455 : pkrelid,
12456 : fkconstraint,
12457 : conoid,
12458 : currcon->conindid,
12459 : ReferencingParentInsTrigger,
12460 : ReferencingParentUpdTrigger,
12461 : &ReferencingInsTriggerOid,
12462 : &ReferencingUpdTriggerOid);
12463 :
12464 : /*
12465 : * Tell Phase 3 to check that the constraint is satisfied by existing
12466 : * rows.
12467 : */
12468 78 : if (rel->rd_rel->relkind == RELKIND_RELATION)
12469 : {
12470 : AlteredTableInfo *tab;
12471 : NewConstraint *newcon;
12472 :
12473 60 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
12474 60 : newcon->name = fkconstraint->conname;
12475 60 : newcon->contype = CONSTR_FOREIGN;
12476 60 : newcon->refrelid = currcon->confrelid;
12477 60 : newcon->refindid = currcon->conindid;
12478 60 : newcon->conid = currcon->oid;
12479 60 : newcon->qual = (Node *) fkconstraint;
12480 :
12481 : /* Find or create work queue entry for this table */
12482 60 : tab = ATGetQueueEntry(wqueue, rel);
12483 60 : tab->constraints = lappend(tab->constraints, newcon);
12484 : }
12485 :
12486 : /*
12487 : * If the table at either end of the constraint is partitioned, we
12488 : * need to recurse and create triggers for each constraint that is a
12489 : * child of this one.
12490 : */
12491 138 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12492 60 : get_rel_relkind(currcon->confrelid) == RELKIND_PARTITIONED_TABLE)
12493 18 : AlterConstrEnforceabilityRecurse(wqueue, cmdcon, conrel, tgrel,
12494 : fkrelid, pkrelid, contuple,
12495 : lockmode, ReferencedDelTriggerOid,
12496 : ReferencedUpdTriggerOid,
12497 : ReferencingInsTriggerOid,
12498 : ReferencingUpdTriggerOid);
12499 : }
12500 :
12501 150 : table_close(rel, NoLock);
12502 :
12503 150 : return changed;
12504 : }
12505 :
12506 : /*
12507 : * Returns true if the constraint's deferrability is altered.
12508 : *
12509 : * *otherrelids is appended OIDs of relations containing affected triggers.
12510 : *
12511 : * Note that we must recurse even when the values are correct, in case
12512 : * indirect descendants have had their constraints altered locally.
12513 : * (This could be avoided if we forbade altering constraints in partitions
12514 : * but existing releases don't do that.)
12515 : */
12516 : static bool
12517 162 : ATExecAlterConstrDeferrability(List **wqueue, ATAlterConstraint *cmdcon,
12518 : Relation conrel, Relation tgrel, Relation rel,
12519 : HeapTuple contuple, bool recurse,
12520 : List **otherrelids, LOCKMODE lockmode)
12521 : {
12522 : Form_pg_constraint currcon;
12523 : Oid refrelid;
12524 162 : bool changed = false;
12525 :
12526 : /* since this function recurses, it could be driven to stack overflow */
12527 162 : check_stack_depth();
12528 :
12529 : Assert(cmdcon->alterDeferrability);
12530 :
12531 162 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12532 162 : refrelid = currcon->confrelid;
12533 :
12534 : /* Should be foreign key constraint */
12535 : Assert(currcon->contype == CONSTRAINT_FOREIGN);
12536 :
12537 : /*
12538 : * If called to modify a constraint that's already in the desired state,
12539 : * silently do nothing.
12540 : */
12541 162 : if (currcon->condeferrable != cmdcon->deferrable ||
12542 6 : currcon->condeferred != cmdcon->initdeferred)
12543 : {
12544 162 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12545 162 : changed = true;
12546 :
12547 : /*
12548 : * Now we need to update the multiple entries in pg_trigger that
12549 : * implement the constraint.
12550 : */
12551 162 : AlterConstrTriggerDeferrability(currcon->oid, tgrel, rel,
12552 162 : cmdcon->deferrable,
12553 162 : cmdcon->initdeferred, otherrelids);
12554 : }
12555 :
12556 : /*
12557 : * If the table at either end of the constraint is partitioned, we need to
12558 : * handle every constraint that is a child of this one.
12559 : */
12560 162 : if (recurse && changed &&
12561 300 : (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12562 138 : get_rel_relkind(refrelid) == RELKIND_PARTITIONED_TABLE))
12563 42 : AlterConstrDeferrabilityRecurse(wqueue, cmdcon, conrel, tgrel, rel,
12564 : contuple, recurse, otherrelids,
12565 : lockmode);
12566 :
12567 162 : return changed;
12568 : }
12569 :
12570 : /*
12571 : * Returns true if the constraint's inheritability is altered.
12572 : */
12573 : static bool
12574 60 : ATExecAlterConstrInheritability(List **wqueue, ATAlterConstraint *cmdcon,
12575 : Relation conrel, Relation rel,
12576 : HeapTuple contuple, LOCKMODE lockmode)
12577 : {
12578 : Form_pg_constraint currcon;
12579 : AttrNumber colNum;
12580 : char *colName;
12581 : List *children;
12582 :
12583 : Assert(cmdcon->alterInheritability);
12584 :
12585 60 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12586 :
12587 : /* The current implementation only works for NOT NULL constraints */
12588 : Assert(currcon->contype == CONSTRAINT_NOTNULL);
12589 :
12590 : /*
12591 : * If called to modify a constraint that's already in the desired state,
12592 : * silently do nothing.
12593 : */
12594 60 : if (cmdcon->noinherit == currcon->connoinherit)
12595 0 : return false;
12596 :
12597 60 : AlterConstrUpdateConstraintEntry(cmdcon, conrel, contuple);
12598 60 : CommandCounterIncrement();
12599 :
12600 : /* Fetch the column number and name */
12601 60 : colNum = extractNotNullColumn(contuple);
12602 60 : colName = get_attname(currcon->conrelid, colNum, false);
12603 :
12604 : /*
12605 : * Propagate the change to children. For this subcommand type we don't
12606 : * recursively affect children, just the immediate level.
12607 : */
12608 60 : children = find_inheritance_children(RelationGetRelid(rel),
12609 : lockmode);
12610 192 : foreach_oid(childoid, children)
12611 : {
12612 : ObjectAddress addr;
12613 :
12614 84 : if (cmdcon->noinherit)
12615 : {
12616 : HeapTuple childtup;
12617 : Form_pg_constraint childcon;
12618 :
12619 30 : childtup = findNotNullConstraint(childoid, colName);
12620 30 : if (!childtup)
12621 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
12622 : colName, childoid);
12623 30 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12624 : Assert(childcon->coninhcount > 0);
12625 30 : childcon->coninhcount--;
12626 30 : childcon->conislocal = true;
12627 30 : CatalogTupleUpdate(conrel, &childtup->t_self, childtup);
12628 30 : heap_freetuple(childtup);
12629 : }
12630 : else
12631 : {
12632 54 : Relation childrel = table_open(childoid, NoLock);
12633 :
12634 54 : addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
12635 : colName, true, true, lockmode);
12636 48 : if (OidIsValid(addr.objectId))
12637 48 : CommandCounterIncrement();
12638 48 : table_close(childrel, NoLock);
12639 : }
12640 : }
12641 :
12642 54 : return true;
12643 : }
12644 :
12645 : /*
12646 : * A subroutine of ATExecAlterConstrDeferrability that updated constraint
12647 : * trigger's deferrability.
12648 : *
12649 : * The arguments to this function have the same meaning as the arguments to
12650 : * ATExecAlterConstrDeferrability.
12651 : */
12652 : static void
12653 162 : AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
12654 : bool deferrable, bool initdeferred,
12655 : List **otherrelids)
12656 : {
12657 : HeapTuple tgtuple;
12658 : ScanKeyData tgkey;
12659 : SysScanDesc tgscan;
12660 :
12661 162 : ScanKeyInit(&tgkey,
12662 : Anum_pg_trigger_tgconstraint,
12663 : BTEqualStrategyNumber, F_OIDEQ,
12664 : ObjectIdGetDatum(conoid));
12665 162 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
12666 : NULL, 1, &tgkey);
12667 630 : while (HeapTupleIsValid(tgtuple = systable_getnext(tgscan)))
12668 : {
12669 468 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tgtuple);
12670 : Form_pg_trigger copy_tg;
12671 : HeapTuple tgCopyTuple;
12672 :
12673 : /*
12674 : * Remember OIDs of other relation(s) involved in FK constraint.
12675 : * (Note: it's likely that we could skip forcing a relcache inval for
12676 : * other rels that don't have a trigger whose properties change, but
12677 : * let's be conservative.)
12678 : */
12679 468 : if (tgform->tgrelid != RelationGetRelid(rel))
12680 228 : *otherrelids = list_append_unique_oid(*otherrelids,
12681 : tgform->tgrelid);
12682 :
12683 : /*
12684 : * Update enable status and deferrability of RI_FKey_noaction_del,
12685 : * RI_FKey_noaction_upd, RI_FKey_check_ins and RI_FKey_check_upd
12686 : * triggers, but not others; see createForeignKeyActionTriggers and
12687 : * CreateFKCheckTrigger.
12688 : */
12689 468 : if (tgform->tgfoid != F_RI_FKEY_NOACTION_DEL &&
12690 372 : tgform->tgfoid != F_RI_FKEY_NOACTION_UPD &&
12691 258 : tgform->tgfoid != F_RI_FKEY_CHECK_INS &&
12692 138 : tgform->tgfoid != F_RI_FKEY_CHECK_UPD)
12693 18 : continue;
12694 :
12695 450 : tgCopyTuple = heap_copytuple(tgtuple);
12696 450 : copy_tg = (Form_pg_trigger) GETSTRUCT(tgCopyTuple);
12697 :
12698 450 : copy_tg->tgdeferrable = deferrable;
12699 450 : copy_tg->tginitdeferred = initdeferred;
12700 450 : CatalogTupleUpdate(tgrel, &tgCopyTuple->t_self, tgCopyTuple);
12701 :
12702 450 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
12703 :
12704 450 : heap_freetuple(tgCopyTuple);
12705 : }
12706 :
12707 162 : systable_endscan(tgscan);
12708 162 : }
12709 :
12710 : /*
12711 : * Invokes ATExecAlterConstrEnforceability for each constraint that is a child of
12712 : * the specified constraint.
12713 : *
12714 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
12715 : * list of child relations and recursing; instead it uses the conparentid
12716 : * relationships. This may need to be reconsidered.
12717 : *
12718 : * The arguments to this function have the same meaning as the arguments to
12719 : * ATExecAlterConstrEnforceability.
12720 : */
12721 : static void
12722 36 : AlterConstrEnforceabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12723 : Relation conrel, Relation tgrel,
12724 : Oid fkrelid, Oid pkrelid,
12725 : HeapTuple contuple, LOCKMODE lockmode,
12726 : Oid ReferencedParentDelTrigger,
12727 : Oid ReferencedParentUpdTrigger,
12728 : Oid ReferencingParentInsTrigger,
12729 : Oid ReferencingParentUpdTrigger)
12730 : {
12731 : Form_pg_constraint currcon;
12732 : Oid conoid;
12733 : ScanKeyData pkey;
12734 : SysScanDesc pscan;
12735 : HeapTuple childtup;
12736 :
12737 36 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12738 36 : conoid = currcon->oid;
12739 :
12740 36 : ScanKeyInit(&pkey,
12741 : Anum_pg_constraint_conparentid,
12742 : BTEqualStrategyNumber, F_OIDEQ,
12743 : ObjectIdGetDatum(conoid));
12744 :
12745 36 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
12746 : true, NULL, 1, &pkey);
12747 :
12748 120 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
12749 84 : ATExecAlterConstrEnforceability(wqueue, cmdcon, conrel, tgrel, fkrelid,
12750 : pkrelid, childtup, lockmode,
12751 : ReferencedParentDelTrigger,
12752 : ReferencedParentUpdTrigger,
12753 : ReferencingParentInsTrigger,
12754 : ReferencingParentUpdTrigger);
12755 :
12756 36 : systable_endscan(pscan);
12757 36 : }
12758 :
12759 : /*
12760 : * Invokes ATExecAlterConstrDeferrability for each constraint that is a child of
12761 : * the specified constraint.
12762 : *
12763 : * Note that this doesn't handle recursion the normal way, viz. by scanning the
12764 : * list of child relations and recursing; instead it uses the conparentid
12765 : * relationships. This may need to be reconsidered.
12766 : *
12767 : * The arguments to this function have the same meaning as the arguments to
12768 : * ATExecAlterConstrDeferrability.
12769 : */
12770 : static void
12771 42 : AlterConstrDeferrabilityRecurse(List **wqueue, ATAlterConstraint *cmdcon,
12772 : Relation conrel, Relation tgrel, Relation rel,
12773 : HeapTuple contuple, bool recurse,
12774 : List **otherrelids, LOCKMODE lockmode)
12775 : {
12776 : Form_pg_constraint currcon;
12777 : Oid conoid;
12778 : ScanKeyData pkey;
12779 : SysScanDesc pscan;
12780 : HeapTuple childtup;
12781 :
12782 42 : currcon = (Form_pg_constraint) GETSTRUCT(contuple);
12783 42 : conoid = currcon->oid;
12784 :
12785 42 : ScanKeyInit(&pkey,
12786 : Anum_pg_constraint_conparentid,
12787 : BTEqualStrategyNumber, F_OIDEQ,
12788 : ObjectIdGetDatum(conoid));
12789 :
12790 42 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
12791 : true, NULL, 1, &pkey);
12792 :
12793 108 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
12794 : {
12795 66 : Form_pg_constraint childcon = (Form_pg_constraint) GETSTRUCT(childtup);
12796 : Relation childrel;
12797 :
12798 66 : childrel = table_open(childcon->conrelid, lockmode);
12799 :
12800 66 : ATExecAlterConstrDeferrability(wqueue, cmdcon, conrel, tgrel, childrel,
12801 : childtup, recurse, otherrelids, lockmode);
12802 66 : table_close(childrel, NoLock);
12803 : }
12804 :
12805 42 : systable_endscan(pscan);
12806 42 : }
12807 :
12808 : /*
12809 : * Update the constraint entry for the given ATAlterConstraint command, and
12810 : * invoke the appropriate hooks.
12811 : */
12812 : static void
12813 366 : AlterConstrUpdateConstraintEntry(ATAlterConstraint *cmdcon, Relation conrel,
12814 : HeapTuple contuple)
12815 : {
12816 : HeapTuple copyTuple;
12817 : Form_pg_constraint copy_con;
12818 :
12819 : Assert(cmdcon->alterEnforceability || cmdcon->alterDeferrability ||
12820 : cmdcon->alterInheritability);
12821 :
12822 366 : copyTuple = heap_copytuple(contuple);
12823 366 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
12824 :
12825 366 : if (cmdcon->alterEnforceability)
12826 : {
12827 144 : copy_con->conenforced = cmdcon->is_enforced;
12828 :
12829 : /*
12830 : * NB: The convalidated status is irrelevant when the constraint is
12831 : * set to NOT ENFORCED, but for consistency, it should still be set
12832 : * appropriately. Similarly, if the constraint is later changed to
12833 : * ENFORCED, validation will be performed during phase 3, so it makes
12834 : * sense to mark it as valid in that case.
12835 : */
12836 144 : copy_con->convalidated = cmdcon->is_enforced;
12837 : }
12838 366 : if (cmdcon->alterDeferrability)
12839 : {
12840 168 : copy_con->condeferrable = cmdcon->deferrable;
12841 168 : copy_con->condeferred = cmdcon->initdeferred;
12842 : }
12843 366 : if (cmdcon->alterInheritability)
12844 60 : copy_con->connoinherit = cmdcon->noinherit;
12845 :
12846 366 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
12847 366 : InvokeObjectPostAlterHook(ConstraintRelationId, copy_con->oid, 0);
12848 :
12849 : /* Make new constraint flags visible to others */
12850 366 : CacheInvalidateRelcacheByRelid(copy_con->conrelid);
12851 :
12852 366 : heap_freetuple(copyTuple);
12853 366 : }
12854 :
12855 : /*
12856 : * ALTER TABLE VALIDATE CONSTRAINT
12857 : *
12858 : * XXX The reason we handle recursion here rather than at Phase 1 is because
12859 : * there's no good way to skip recursing when handling foreign keys: there is
12860 : * no need to lock children in that case, yet we wouldn't be able to avoid
12861 : * doing so at that level.
12862 : *
12863 : * Return value is the address of the validated constraint. If the constraint
12864 : * was already validated, InvalidObjectAddress is returned.
12865 : */
12866 : static ObjectAddress
12867 572 : ATExecValidateConstraint(List **wqueue, Relation rel, char *constrName,
12868 : bool recurse, bool recursing, LOCKMODE lockmode)
12869 : {
12870 : Relation conrel;
12871 : SysScanDesc scan;
12872 : ScanKeyData skey[3];
12873 : HeapTuple tuple;
12874 : Form_pg_constraint con;
12875 : ObjectAddress address;
12876 :
12877 572 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
12878 :
12879 : /*
12880 : * Find and check the target constraint
12881 : */
12882 572 : ScanKeyInit(&skey[0],
12883 : Anum_pg_constraint_conrelid,
12884 : BTEqualStrategyNumber, F_OIDEQ,
12885 : ObjectIdGetDatum(RelationGetRelid(rel)));
12886 572 : ScanKeyInit(&skey[1],
12887 : Anum_pg_constraint_contypid,
12888 : BTEqualStrategyNumber, F_OIDEQ,
12889 : ObjectIdGetDatum(InvalidOid));
12890 572 : ScanKeyInit(&skey[2],
12891 : Anum_pg_constraint_conname,
12892 : BTEqualStrategyNumber, F_NAMEEQ,
12893 : CStringGetDatum(constrName));
12894 572 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
12895 : true, NULL, 3, skey);
12896 :
12897 : /* There can be at most one matching row */
12898 572 : if (!HeapTupleIsValid(tuple = systable_getnext(scan)))
12899 0 : ereport(ERROR,
12900 : (errcode(ERRCODE_UNDEFINED_OBJECT),
12901 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
12902 : constrName, RelationGetRelationName(rel))));
12903 :
12904 572 : con = (Form_pg_constraint) GETSTRUCT(tuple);
12905 572 : if (con->contype != CONSTRAINT_FOREIGN &&
12906 256 : con->contype != CONSTRAINT_CHECK &&
12907 112 : con->contype != CONSTRAINT_NOTNULL)
12908 0 : ereport(ERROR,
12909 : errcode(ERRCODE_WRONG_OBJECT_TYPE),
12910 : errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key, check, or not-null constraint",
12911 : constrName, RelationGetRelationName(rel)));
12912 :
12913 572 : if (!con->conenforced)
12914 6 : ereport(ERROR,
12915 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
12916 : errmsg("cannot validate NOT ENFORCED constraint")));
12917 :
12918 566 : if (!con->convalidated)
12919 : {
12920 548 : if (con->contype == CONSTRAINT_FOREIGN)
12921 : {
12922 310 : QueueFKConstraintValidation(wqueue, conrel, rel, tuple, lockmode);
12923 : }
12924 238 : else if (con->contype == CONSTRAINT_CHECK)
12925 : {
12926 126 : QueueCheckConstraintValidation(wqueue, conrel, rel, constrName,
12927 : tuple, recurse, recursing, lockmode);
12928 : }
12929 112 : else if (con->contype == CONSTRAINT_NOTNULL)
12930 : {
12931 112 : QueueNNConstraintValidation(wqueue, conrel, rel,
12932 : tuple, recurse, recursing, lockmode);
12933 : }
12934 :
12935 548 : ObjectAddressSet(address, ConstraintRelationId, con->oid);
12936 : }
12937 : else
12938 18 : address = InvalidObjectAddress; /* already validated */
12939 :
12940 566 : systable_endscan(scan);
12941 :
12942 566 : table_close(conrel, RowExclusiveLock);
12943 :
12944 566 : return address;
12945 : }
12946 :
12947 : /*
12948 : * QueueFKConstraintValidation
12949 : *
12950 : * Add an entry to the wqueue to validate the given foreign key constraint in
12951 : * Phase 3 and update the convalidated field in the pg_constraint catalog
12952 : * for the specified relation and all its children.
12953 : */
12954 : static void
12955 334 : QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation rel,
12956 : HeapTuple contuple, LOCKMODE lockmode)
12957 : {
12958 : Form_pg_constraint con;
12959 : AlteredTableInfo *tab;
12960 : HeapTuple copyTuple;
12961 : Form_pg_constraint copy_con;
12962 :
12963 334 : con = (Form_pg_constraint) GETSTRUCT(contuple);
12964 : Assert(con->contype == CONSTRAINT_FOREIGN);
12965 : Assert(!con->convalidated);
12966 :
12967 334 : if (rel->rd_rel->relkind == RELKIND_RELATION)
12968 : {
12969 : NewConstraint *newcon;
12970 : Constraint *fkconstraint;
12971 :
12972 : /* Queue validation for phase 3 */
12973 322 : fkconstraint = makeNode(Constraint);
12974 : /* for now this is all we need */
12975 322 : fkconstraint->conname = pstrdup(NameStr(con->conname));
12976 :
12977 322 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
12978 322 : newcon->name = fkconstraint->conname;
12979 322 : newcon->contype = CONSTR_FOREIGN;
12980 322 : newcon->refrelid = con->confrelid;
12981 322 : newcon->refindid = con->conindid;
12982 322 : newcon->conid = con->oid;
12983 322 : newcon->qual = (Node *) fkconstraint;
12984 :
12985 : /* Find or create work queue entry for this table */
12986 322 : tab = ATGetQueueEntry(wqueue, rel);
12987 322 : tab->constraints = lappend(tab->constraints, newcon);
12988 : }
12989 :
12990 : /*
12991 : * If the table at either end of the constraint is partitioned, we need to
12992 : * recurse and handle every constraint that is a child of this constraint.
12993 : */
12994 656 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
12995 322 : get_rel_relkind(con->confrelid) == RELKIND_PARTITIONED_TABLE)
12996 : {
12997 : ScanKeyData pkey;
12998 : SysScanDesc pscan;
12999 : HeapTuple childtup;
13000 :
13001 18 : ScanKeyInit(&pkey,
13002 : Anum_pg_constraint_conparentid,
13003 : BTEqualStrategyNumber, F_OIDEQ,
13004 : ObjectIdGetDatum(con->oid));
13005 :
13006 18 : pscan = systable_beginscan(conrel, ConstraintParentIndexId,
13007 : true, NULL, 1, &pkey);
13008 :
13009 36 : while (HeapTupleIsValid(childtup = systable_getnext(pscan)))
13010 : {
13011 : Form_pg_constraint childcon;
13012 : Relation childrel;
13013 :
13014 18 : childcon = (Form_pg_constraint) GETSTRUCT(childtup);
13015 :
13016 : /*
13017 : * If the child constraint has already been validated, no further
13018 : * action is required for it or its descendants, as they are all
13019 : * valid.
13020 : */
13021 18 : if (childcon->convalidated)
13022 12 : continue;
13023 :
13024 6 : childrel = table_open(childcon->conrelid, lockmode);
13025 :
13026 6 : QueueFKConstraintValidation(wqueue, conrel, childrel, childtup,
13027 : lockmode);
13028 6 : table_close(childrel, NoLock);
13029 : }
13030 :
13031 18 : systable_endscan(pscan);
13032 : }
13033 :
13034 : /*
13035 : * Now update the catalog, while we have the door open.
13036 : */
13037 334 : copyTuple = heap_copytuple(contuple);
13038 334 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13039 334 : copy_con->convalidated = true;
13040 334 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13041 :
13042 334 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13043 :
13044 334 : heap_freetuple(copyTuple);
13045 334 : }
13046 :
13047 : /*
13048 : * QueueCheckConstraintValidation
13049 : *
13050 : * Add an entry to the wqueue to validate the given check constraint in Phase 3
13051 : * and update the convalidated field in the pg_constraint catalog for the
13052 : * specified relation and all its inheriting children.
13053 : */
13054 : static void
13055 126 : QueueCheckConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13056 : char *constrName, HeapTuple contuple,
13057 : bool recurse, bool recursing, LOCKMODE lockmode)
13058 : {
13059 : Form_pg_constraint con;
13060 : AlteredTableInfo *tab;
13061 : HeapTuple copyTuple;
13062 : Form_pg_constraint copy_con;
13063 :
13064 126 : List *children = NIL;
13065 : ListCell *child;
13066 : NewConstraint *newcon;
13067 : Datum val;
13068 : char *conbin;
13069 :
13070 126 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13071 : Assert(con->contype == CONSTRAINT_CHECK);
13072 :
13073 : /*
13074 : * If we're recursing, the parent has already done this, so skip it. Also,
13075 : * if the constraint is a NO INHERIT constraint, we shouldn't try to look
13076 : * for it in the children.
13077 : */
13078 126 : if (!recursing && !con->connoinherit)
13079 72 : children = find_all_inheritors(RelationGetRelid(rel),
13080 : lockmode, NULL);
13081 :
13082 : /*
13083 : * For CHECK constraints, we must ensure that we only mark the constraint
13084 : * as validated on the parent if it's already validated on the children.
13085 : *
13086 : * We recurse before validating on the parent, to reduce risk of
13087 : * deadlocks.
13088 : */
13089 246 : foreach(child, children)
13090 : {
13091 120 : Oid childoid = lfirst_oid(child);
13092 : Relation childrel;
13093 :
13094 120 : if (childoid == RelationGetRelid(rel))
13095 72 : continue;
13096 :
13097 : /*
13098 : * If we are told not to recurse, there had better not be any child
13099 : * tables, because we can't mark the constraint on the parent valid
13100 : * unless it is valid for all child tables.
13101 : */
13102 48 : if (!recurse)
13103 0 : ereport(ERROR,
13104 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13105 : errmsg("constraint must be validated on child tables too")));
13106 :
13107 : /* find_all_inheritors already got lock */
13108 48 : childrel = table_open(childoid, NoLock);
13109 :
13110 48 : ATExecValidateConstraint(wqueue, childrel, constrName, false,
13111 : true, lockmode);
13112 48 : table_close(childrel, NoLock);
13113 : }
13114 :
13115 : /* Queue validation for phase 3 */
13116 126 : newcon = (NewConstraint *) palloc0(sizeof(NewConstraint));
13117 126 : newcon->name = constrName;
13118 126 : newcon->contype = CONSTR_CHECK;
13119 126 : newcon->refrelid = InvalidOid;
13120 126 : newcon->refindid = InvalidOid;
13121 126 : newcon->conid = con->oid;
13122 :
13123 126 : val = SysCacheGetAttrNotNull(CONSTROID, contuple,
13124 : Anum_pg_constraint_conbin);
13125 126 : conbin = TextDatumGetCString(val);
13126 126 : newcon->qual = expand_generated_columns_in_expr(stringToNode(conbin), rel, 1);
13127 :
13128 : /* Find or create work queue entry for this table */
13129 126 : tab = ATGetQueueEntry(wqueue, rel);
13130 126 : tab->constraints = lappend(tab->constraints, newcon);
13131 :
13132 : /*
13133 : * Invalidate relcache so that others see the new validated constraint.
13134 : */
13135 126 : CacheInvalidateRelcache(rel);
13136 :
13137 : /*
13138 : * Now update the catalog, while we have the door open.
13139 : */
13140 126 : copyTuple = heap_copytuple(contuple);
13141 126 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13142 126 : copy_con->convalidated = true;
13143 126 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13144 :
13145 126 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13146 :
13147 126 : heap_freetuple(copyTuple);
13148 126 : }
13149 :
13150 : /*
13151 : * QueueNNConstraintValidation
13152 : *
13153 : * Add an entry to the wqueue to validate the given not-null constraint in
13154 : * Phase 3 and update the convalidated field in the pg_constraint catalog for
13155 : * the specified relation and all its inheriting children.
13156 : */
13157 : static void
13158 112 : QueueNNConstraintValidation(List **wqueue, Relation conrel, Relation rel,
13159 : HeapTuple contuple, bool recurse, bool recursing,
13160 : LOCKMODE lockmode)
13161 : {
13162 : Form_pg_constraint con;
13163 : AlteredTableInfo *tab;
13164 : HeapTuple copyTuple;
13165 : Form_pg_constraint copy_con;
13166 112 : List *children = NIL;
13167 : AttrNumber attnum;
13168 : char *colname;
13169 :
13170 112 : con = (Form_pg_constraint) GETSTRUCT(contuple);
13171 : Assert(con->contype == CONSTRAINT_NOTNULL);
13172 :
13173 112 : attnum = extractNotNullColumn(contuple);
13174 :
13175 : /*
13176 : * If we're recursing, we've already done this for parent, so skip it.
13177 : * Also, if the constraint is a NO INHERIT constraint, we shouldn't try to
13178 : * look for it in the children.
13179 : *
13180 : * We recurse before validating on the parent, to reduce risk of
13181 : * deadlocks.
13182 : */
13183 112 : if (!recursing && !con->connoinherit)
13184 76 : children = find_all_inheritors(RelationGetRelid(rel), lockmode, NULL);
13185 :
13186 112 : colname = get_attname(RelationGetRelid(rel), attnum, false);
13187 378 : foreach_oid(childoid, children)
13188 : {
13189 : Relation childrel;
13190 : HeapTuple contup;
13191 : Form_pg_constraint childcon;
13192 : char *conname;
13193 :
13194 154 : if (childoid == RelationGetRelid(rel))
13195 76 : continue;
13196 :
13197 : /*
13198 : * If we are told not to recurse, there had better not be any child
13199 : * tables, because we can't mark the constraint on the parent valid
13200 : * unless it is valid for all child tables.
13201 : */
13202 78 : if (!recurse)
13203 0 : ereport(ERROR,
13204 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
13205 : errmsg("constraint must be validated on child tables too"));
13206 :
13207 : /*
13208 : * The column on child might have a different attnum, so search by
13209 : * column name.
13210 : */
13211 78 : contup = findNotNullConstraint(childoid, colname);
13212 78 : if (!contup)
13213 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation \"%s\"",
13214 : colname, get_rel_name(childoid));
13215 78 : childcon = (Form_pg_constraint) GETSTRUCT(contup);
13216 78 : if (childcon->convalidated)
13217 42 : continue;
13218 :
13219 : /* find_all_inheritors already got lock */
13220 36 : childrel = table_open(childoid, NoLock);
13221 36 : conname = pstrdup(NameStr(childcon->conname));
13222 :
13223 : /* XXX improve ATExecValidateConstraint API to avoid double search */
13224 36 : ATExecValidateConstraint(wqueue, childrel, conname,
13225 : false, true, lockmode);
13226 36 : table_close(childrel, NoLock);
13227 : }
13228 :
13229 : /* Set attnotnull appropriately without queueing another validation */
13230 112 : set_attnotnull(NULL, rel, attnum, true, false);
13231 :
13232 112 : tab = ATGetQueueEntry(wqueue, rel);
13233 112 : tab->verify_new_notnull = true;
13234 :
13235 : /*
13236 : * Invalidate relcache so that others see the new validated constraint.
13237 : */
13238 112 : CacheInvalidateRelcache(rel);
13239 :
13240 : /*
13241 : * Now update the catalogs, while we have the door open.
13242 : */
13243 112 : copyTuple = heap_copytuple(contuple);
13244 112 : copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
13245 112 : copy_con->convalidated = true;
13246 112 : CatalogTupleUpdate(conrel, ©Tuple->t_self, copyTuple);
13247 :
13248 112 : InvokeObjectPostAlterHook(ConstraintRelationId, con->oid, 0);
13249 :
13250 112 : heap_freetuple(copyTuple);
13251 112 : }
13252 :
13253 : /*
13254 : * transformColumnNameList - transform list of column names
13255 : *
13256 : * Lookup each name and return its attnum and, optionally, type and collation
13257 : * OIDs
13258 : *
13259 : * Note: the name of this function suggests that it's general-purpose,
13260 : * but actually it's only used to look up names appearing in foreign-key
13261 : * clauses. The error messages would need work to use it in other cases,
13262 : * and perhaps the validity checks as well.
13263 : */
13264 : static int
13265 6568 : transformColumnNameList(Oid relId, List *colList,
13266 : int16 *attnums, Oid *atttypids, Oid *attcollids)
13267 : {
13268 : ListCell *l;
13269 : int attnum;
13270 :
13271 6568 : attnum = 0;
13272 12020 : foreach(l, colList)
13273 : {
13274 5518 : char *attname = strVal(lfirst(l));
13275 : HeapTuple atttuple;
13276 : Form_pg_attribute attform;
13277 :
13278 5518 : atttuple = SearchSysCacheAttName(relId, attname);
13279 5518 : if (!HeapTupleIsValid(atttuple))
13280 54 : ereport(ERROR,
13281 : (errcode(ERRCODE_UNDEFINED_COLUMN),
13282 : errmsg("column \"%s\" referenced in foreign key constraint does not exist",
13283 : attname)));
13284 5464 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
13285 5464 : if (attform->attnum < 0)
13286 12 : ereport(ERROR,
13287 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
13288 : errmsg("system columns cannot be used in foreign keys")));
13289 5452 : if (attnum >= INDEX_MAX_KEYS)
13290 0 : ereport(ERROR,
13291 : (errcode(ERRCODE_TOO_MANY_COLUMNS),
13292 : errmsg("cannot have more than %d keys in a foreign key",
13293 : INDEX_MAX_KEYS)));
13294 5452 : attnums[attnum] = attform->attnum;
13295 5452 : if (atttypids != NULL)
13296 5416 : atttypids[attnum] = attform->atttypid;
13297 5452 : if (attcollids != NULL)
13298 5416 : attcollids[attnum] = attform->attcollation;
13299 5452 : ReleaseSysCache(atttuple);
13300 5452 : attnum++;
13301 : }
13302 :
13303 6502 : return attnum;
13304 : }
13305 :
13306 : /*
13307 : * transformFkeyGetPrimaryKey -
13308 : *
13309 : * Look up the names, attnums, types, and collations of the primary key attributes
13310 : * for the pkrel. Also return the index OID and index opclasses of the
13311 : * index supporting the primary key. Also return whether the index has
13312 : * WITHOUT OVERLAPS.
13313 : *
13314 : * All parameters except pkrel are output parameters. Also, the function
13315 : * return value is the number of attributes in the primary key.
13316 : *
13317 : * Used when the column list in the REFERENCES specification is omitted.
13318 : */
13319 : static int
13320 1184 : transformFkeyGetPrimaryKey(Relation pkrel, Oid *indexOid,
13321 : List **attnamelist,
13322 : int16 *attnums, Oid *atttypids, Oid *attcollids,
13323 : Oid *opclasses, bool *pk_has_without_overlaps)
13324 : {
13325 : List *indexoidlist;
13326 : ListCell *indexoidscan;
13327 1184 : HeapTuple indexTuple = NULL;
13328 1184 : Form_pg_index indexStruct = NULL;
13329 : Datum indclassDatum;
13330 : oidvector *indclass;
13331 : int i;
13332 :
13333 : /*
13334 : * Get the list of index OIDs for the table from the relcache, and look up
13335 : * each one in the pg_index syscache until we find one marked primary key
13336 : * (hopefully there isn't more than one such). Insist it's valid, too.
13337 : */
13338 1184 : *indexOid = InvalidOid;
13339 :
13340 1184 : indexoidlist = RelationGetIndexList(pkrel);
13341 :
13342 1190 : foreach(indexoidscan, indexoidlist)
13343 : {
13344 1190 : Oid indexoid = lfirst_oid(indexoidscan);
13345 :
13346 1190 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13347 1190 : if (!HeapTupleIsValid(indexTuple))
13348 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13349 1190 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13350 1190 : if (indexStruct->indisprimary && indexStruct->indisvalid)
13351 : {
13352 : /*
13353 : * Refuse to use a deferrable primary key. This is per SQL spec,
13354 : * and there would be a lot of interesting semantic problems if we
13355 : * tried to allow it.
13356 : */
13357 1184 : if (!indexStruct->indimmediate)
13358 0 : ereport(ERROR,
13359 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13360 : errmsg("cannot use a deferrable primary key for referenced table \"%s\"",
13361 : RelationGetRelationName(pkrel))));
13362 :
13363 1184 : *indexOid = indexoid;
13364 1184 : break;
13365 : }
13366 6 : ReleaseSysCache(indexTuple);
13367 : }
13368 :
13369 1184 : list_free(indexoidlist);
13370 :
13371 : /*
13372 : * Check that we found it
13373 : */
13374 1184 : if (!OidIsValid(*indexOid))
13375 0 : ereport(ERROR,
13376 : (errcode(ERRCODE_UNDEFINED_OBJECT),
13377 : errmsg("there is no primary key for referenced table \"%s\"",
13378 : RelationGetRelationName(pkrel))));
13379 :
13380 : /* Must get indclass the hard way */
13381 1184 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13382 : Anum_pg_index_indclass);
13383 1184 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13384 :
13385 : /*
13386 : * Now build the list of PK attributes from the indkey definition (we
13387 : * assume a primary key cannot have expressional elements)
13388 : */
13389 1184 : *attnamelist = NIL;
13390 2798 : for (i = 0; i < indexStruct->indnkeyatts; i++)
13391 : {
13392 1614 : int pkattno = indexStruct->indkey.values[i];
13393 :
13394 1614 : attnums[i] = pkattno;
13395 1614 : atttypids[i] = attnumTypeId(pkrel, pkattno);
13396 1614 : attcollids[i] = attnumCollationId(pkrel, pkattno);
13397 1614 : opclasses[i] = indclass->values[i];
13398 1614 : *attnamelist = lappend(*attnamelist,
13399 1614 : makeString(pstrdup(NameStr(*attnumAttName(pkrel, pkattno)))));
13400 : }
13401 :
13402 1184 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13403 :
13404 1184 : ReleaseSysCache(indexTuple);
13405 :
13406 1184 : return i;
13407 : }
13408 :
13409 : /*
13410 : * transformFkeyCheckAttrs -
13411 : *
13412 : * Validate that the 'attnums' columns in the 'pkrel' relation are valid to
13413 : * reference as part of a foreign key constraint.
13414 : *
13415 : * Returns the OID of the unique index supporting the constraint and
13416 : * populates the caller-provided 'opclasses' array with the opclasses
13417 : * associated with the index columns. Also sets whether the index
13418 : * uses WITHOUT OVERLAPS.
13419 : *
13420 : * Raises an ERROR on validation failure.
13421 : */
13422 : static Oid
13423 1320 : transformFkeyCheckAttrs(Relation pkrel,
13424 : int numattrs, int16 *attnums,
13425 : bool with_period, Oid *opclasses,
13426 : bool *pk_has_without_overlaps)
13427 : {
13428 1320 : Oid indexoid = InvalidOid;
13429 1320 : bool found = false;
13430 1320 : bool found_deferrable = false;
13431 : List *indexoidlist;
13432 : ListCell *indexoidscan;
13433 : int i,
13434 : j;
13435 :
13436 : /*
13437 : * Reject duplicate appearances of columns in the referenced-columns list.
13438 : * Such a case is forbidden by the SQL standard, and even if we thought it
13439 : * useful to allow it, there would be ambiguity about how to match the
13440 : * list to unique indexes (in particular, it'd be unclear which index
13441 : * opclass goes with which FK column).
13442 : */
13443 3092 : for (i = 0; i < numattrs; i++)
13444 : {
13445 2346 : for (j = i + 1; j < numattrs; j++)
13446 : {
13447 574 : if (attnums[i] == attnums[j])
13448 24 : ereport(ERROR,
13449 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13450 : errmsg("foreign key referenced-columns list must not contain duplicates")));
13451 : }
13452 : }
13453 :
13454 : /*
13455 : * Get the list of index OIDs for the table from the relcache, and look up
13456 : * each one in the pg_index syscache, and match unique indexes to the list
13457 : * of attnums we are given.
13458 : */
13459 1296 : indexoidlist = RelationGetIndexList(pkrel);
13460 :
13461 1478 : foreach(indexoidscan, indexoidlist)
13462 : {
13463 : HeapTuple indexTuple;
13464 : Form_pg_index indexStruct;
13465 :
13466 1466 : indexoid = lfirst_oid(indexoidscan);
13467 1466 : indexTuple = SearchSysCache1(INDEXRELID, ObjectIdGetDatum(indexoid));
13468 1466 : if (!HeapTupleIsValid(indexTuple))
13469 0 : elog(ERROR, "cache lookup failed for index %u", indexoid);
13470 1466 : indexStruct = (Form_pg_index) GETSTRUCT(indexTuple);
13471 :
13472 : /*
13473 : * Must have the right number of columns; must be unique (or if
13474 : * temporal then exclusion instead) and not a partial index; forget it
13475 : * if there are any expressions, too. Invalid indexes are out as well.
13476 : */
13477 2824 : if (indexStruct->indnkeyatts == numattrs &&
13478 1358 : (with_period ? indexStruct->indisexclusion : indexStruct->indisunique) &&
13479 2684 : indexStruct->indisvalid &&
13480 2684 : heap_attisnull(indexTuple, Anum_pg_index_indpred, NULL) &&
13481 1342 : heap_attisnull(indexTuple, Anum_pg_index_indexprs, NULL))
13482 : {
13483 : Datum indclassDatum;
13484 : oidvector *indclass;
13485 :
13486 : /* Must get indclass the hard way */
13487 1342 : indclassDatum = SysCacheGetAttrNotNull(INDEXRELID, indexTuple,
13488 : Anum_pg_index_indclass);
13489 1342 : indclass = (oidvector *) DatumGetPointer(indclassDatum);
13490 :
13491 : /*
13492 : * The given attnum list may match the index columns in any order.
13493 : * Check for a match, and extract the appropriate opclasses while
13494 : * we're at it.
13495 : *
13496 : * We know that attnums[] is duplicate-free per the test at the
13497 : * start of this function, and we checked above that the number of
13498 : * index columns agrees, so if we find a match for each attnums[]
13499 : * entry then we must have a one-to-one match in some order.
13500 : */
13501 3102 : for (i = 0; i < numattrs; i++)
13502 : {
13503 1818 : found = false;
13504 2426 : for (j = 0; j < numattrs; j++)
13505 : {
13506 2368 : if (attnums[i] == indexStruct->indkey.values[j])
13507 : {
13508 1760 : opclasses[i] = indclass->values[j];
13509 1760 : found = true;
13510 1760 : break;
13511 : }
13512 : }
13513 1818 : if (!found)
13514 58 : break;
13515 : }
13516 : /* The last attribute in the index must be the PERIOD FK part */
13517 1342 : if (found && with_period)
13518 : {
13519 128 : int16 periodattnum = attnums[numattrs - 1];
13520 :
13521 128 : found = (periodattnum == indexStruct->indkey.values[numattrs - 1]);
13522 : }
13523 :
13524 : /*
13525 : * Refuse to use a deferrable unique/primary key. This is per SQL
13526 : * spec, and there would be a lot of interesting semantic problems
13527 : * if we tried to allow it.
13528 : */
13529 1342 : if (found && !indexStruct->indimmediate)
13530 : {
13531 : /*
13532 : * Remember that we found an otherwise matching index, so that
13533 : * we can generate a more appropriate error message.
13534 : */
13535 0 : found_deferrable = true;
13536 0 : found = false;
13537 : }
13538 :
13539 : /* We need to know whether the index has WITHOUT OVERLAPS */
13540 1342 : if (found)
13541 1284 : *pk_has_without_overlaps = indexStruct->indisexclusion;
13542 : }
13543 1466 : ReleaseSysCache(indexTuple);
13544 1466 : if (found)
13545 1284 : break;
13546 : }
13547 :
13548 1296 : if (!found)
13549 : {
13550 12 : if (found_deferrable)
13551 0 : ereport(ERROR,
13552 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
13553 : errmsg("cannot use a deferrable unique constraint for referenced table \"%s\"",
13554 : RelationGetRelationName(pkrel))));
13555 : else
13556 12 : ereport(ERROR,
13557 : (errcode(ERRCODE_INVALID_FOREIGN_KEY),
13558 : errmsg("there is no unique constraint matching given keys for referenced table \"%s\"",
13559 : RelationGetRelationName(pkrel))));
13560 : }
13561 :
13562 1284 : list_free(indexoidlist);
13563 :
13564 1284 : return indexoid;
13565 : }
13566 :
13567 : /*
13568 : * findFkeyCast -
13569 : *
13570 : * Wrapper around find_coercion_pathway() for ATAddForeignKeyConstraint().
13571 : * Caller has equal regard for binary coercibility and for an exact match.
13572 : */
13573 : static CoercionPathType
13574 12 : findFkeyCast(Oid targetTypeId, Oid sourceTypeId, Oid *funcid)
13575 : {
13576 : CoercionPathType ret;
13577 :
13578 12 : if (targetTypeId == sourceTypeId)
13579 : {
13580 12 : ret = COERCION_PATH_RELABELTYPE;
13581 12 : *funcid = InvalidOid;
13582 : }
13583 : else
13584 : {
13585 0 : ret = find_coercion_pathway(targetTypeId, sourceTypeId,
13586 : COERCION_IMPLICIT, funcid);
13587 0 : if (ret == COERCION_PATH_NONE)
13588 : /* A previously-relied-upon cast is now gone. */
13589 0 : elog(ERROR, "could not find cast from %u to %u",
13590 : sourceTypeId, targetTypeId);
13591 : }
13592 :
13593 12 : return ret;
13594 : }
13595 :
13596 : /*
13597 : * Permissions checks on the referenced table for ADD FOREIGN KEY
13598 : *
13599 : * Note: we have already checked that the user owns the referencing table,
13600 : * else we'd have failed much earlier; no additional checks are needed for it.
13601 : */
13602 : static void
13603 2432 : checkFkeyPermissions(Relation rel, int16 *attnums, int natts)
13604 : {
13605 2432 : Oid roleid = GetUserId();
13606 : AclResult aclresult;
13607 : int i;
13608 :
13609 : /* Okay if we have relation-level REFERENCES permission */
13610 2432 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), roleid,
13611 : ACL_REFERENCES);
13612 2432 : if (aclresult == ACLCHECK_OK)
13613 2432 : return;
13614 : /* Else we must have REFERENCES on each column */
13615 0 : for (i = 0; i < natts; i++)
13616 : {
13617 0 : aclresult = pg_attribute_aclcheck(RelationGetRelid(rel), attnums[i],
13618 : roleid, ACL_REFERENCES);
13619 0 : if (aclresult != ACLCHECK_OK)
13620 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
13621 0 : RelationGetRelationName(rel));
13622 : }
13623 : }
13624 :
13625 : /*
13626 : * Scan the existing rows in a table to verify they meet a proposed FK
13627 : * constraint.
13628 : *
13629 : * Caller must have opened and locked both relations appropriately.
13630 : */
13631 : static void
13632 1212 : validateForeignKeyConstraint(char *conname,
13633 : Relation rel,
13634 : Relation pkrel,
13635 : Oid pkindOid,
13636 : Oid constraintOid,
13637 : bool hasperiod)
13638 : {
13639 : TupleTableSlot *slot;
13640 : TableScanDesc scan;
13641 1212 : Trigger trig = {0};
13642 : Snapshot snapshot;
13643 : MemoryContext oldcxt;
13644 : MemoryContext perTupCxt;
13645 :
13646 1212 : ereport(DEBUG1,
13647 : (errmsg_internal("validating foreign key constraint \"%s\"", conname)));
13648 :
13649 : /*
13650 : * Build a trigger call structure; we'll need it either way.
13651 : */
13652 1212 : trig.tgoid = InvalidOid;
13653 1212 : trig.tgname = conname;
13654 1212 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
13655 1212 : trig.tgisinternal = true;
13656 1212 : trig.tgconstrrelid = RelationGetRelid(pkrel);
13657 1212 : trig.tgconstrindid = pkindOid;
13658 1212 : trig.tgconstraint = constraintOid;
13659 1212 : trig.tgdeferrable = false;
13660 1212 : trig.tginitdeferred = false;
13661 : /* we needn't fill in remaining fields */
13662 :
13663 : /*
13664 : * See if we can do it with a single LEFT JOIN query. A false result
13665 : * indicates we must proceed with the fire-the-trigger method. We can't do
13666 : * a LEFT JOIN for temporal FKs yet, but we can once we support temporal
13667 : * left joins.
13668 : */
13669 1212 : if (!hasperiod && RI_Initial_Check(&trig, rel, pkrel))
13670 1024 : return;
13671 :
13672 : /*
13673 : * Scan through each tuple, calling RI_FKey_check_ins (insert trigger) as
13674 : * if that tuple had just been inserted. If any of those fail, it should
13675 : * ereport(ERROR) and that's that.
13676 : */
13677 114 : snapshot = RegisterSnapshot(GetLatestSnapshot());
13678 114 : slot = table_slot_create(rel, NULL);
13679 114 : scan = table_beginscan(rel, snapshot, 0, NULL);
13680 :
13681 114 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
13682 : "validateForeignKeyConstraint",
13683 : ALLOCSET_SMALL_SIZES);
13684 114 : oldcxt = MemoryContextSwitchTo(perTupCxt);
13685 :
13686 200 : while (table_scan_getnextslot(scan, ForwardScanDirection, slot))
13687 : {
13688 104 : LOCAL_FCINFO(fcinfo, 0);
13689 104 : TriggerData trigdata = {0};
13690 :
13691 104 : CHECK_FOR_INTERRUPTS();
13692 :
13693 : /*
13694 : * Make a call to the trigger function
13695 : *
13696 : * No parameters are passed, but we do set a context
13697 : */
13698 520 : MemSet(fcinfo, 0, SizeForFunctionCallInfo(0));
13699 :
13700 : /*
13701 : * We assume RI_FKey_check_ins won't look at flinfo...
13702 : */
13703 104 : trigdata.type = T_TriggerData;
13704 104 : trigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
13705 104 : trigdata.tg_relation = rel;
13706 104 : trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, false, NULL);
13707 104 : trigdata.tg_trigslot = slot;
13708 104 : trigdata.tg_trigger = &trig;
13709 :
13710 104 : fcinfo->context = (Node *) &trigdata;
13711 :
13712 104 : RI_FKey_check_ins(fcinfo);
13713 :
13714 86 : MemoryContextReset(perTupCxt);
13715 : }
13716 :
13717 96 : MemoryContextSwitchTo(oldcxt);
13718 96 : MemoryContextDelete(perTupCxt);
13719 96 : table_endscan(scan);
13720 96 : UnregisterSnapshot(snapshot);
13721 96 : ExecDropSingleTupleTableSlot(slot);
13722 : }
13723 :
13724 : /*
13725 : * CreateFKCheckTrigger
13726 : * Creates the insert (on_insert=true) or update "check" trigger that
13727 : * implements a given foreign key
13728 : *
13729 : * Returns the OID of the so created trigger.
13730 : */
13731 : static Oid
13732 5900 : CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
13733 : Oid constraintOid, Oid indexOid, Oid parentTrigOid,
13734 : bool on_insert)
13735 : {
13736 : ObjectAddress trigAddress;
13737 : CreateTrigStmt *fk_trigger;
13738 :
13739 : /*
13740 : * Note: for a self-referential FK (referencing and referenced tables are
13741 : * the same), it is important that the ON UPDATE action fires before the
13742 : * CHECK action, since both triggers will fire on the same row during an
13743 : * UPDATE event; otherwise the CHECK trigger will be checking a non-final
13744 : * state of the row. Triggers fire in name order, so we ensure this by
13745 : * using names like "RI_ConstraintTrigger_a_NNNN" for the action triggers
13746 : * and "RI_ConstraintTrigger_c_NNNN" for the check triggers.
13747 : */
13748 5900 : fk_trigger = makeNode(CreateTrigStmt);
13749 5900 : fk_trigger->replace = false;
13750 5900 : fk_trigger->isconstraint = true;
13751 5900 : fk_trigger->trigname = "RI_ConstraintTrigger_c";
13752 5900 : fk_trigger->relation = NULL;
13753 :
13754 : /* Either ON INSERT or ON UPDATE */
13755 5900 : if (on_insert)
13756 : {
13757 2950 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_ins");
13758 2950 : fk_trigger->events = TRIGGER_TYPE_INSERT;
13759 : }
13760 : else
13761 : {
13762 2950 : fk_trigger->funcname = SystemFuncName("RI_FKey_check_upd");
13763 2950 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
13764 : }
13765 :
13766 5900 : fk_trigger->args = NIL;
13767 5900 : fk_trigger->row = true;
13768 5900 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13769 5900 : fk_trigger->columns = NIL;
13770 5900 : fk_trigger->whenClause = NULL;
13771 5900 : fk_trigger->transitionRels = NIL;
13772 5900 : fk_trigger->deferrable = fkconstraint->deferrable;
13773 5900 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13774 5900 : fk_trigger->constrrel = NULL;
13775 :
13776 5900 : trigAddress = CreateTrigger(fk_trigger, NULL, myRelOid, refRelOid,
13777 : constraintOid, indexOid, InvalidOid,
13778 : parentTrigOid, NULL, true, false);
13779 :
13780 : /* Make changes-so-far visible */
13781 5900 : CommandCounterIncrement();
13782 :
13783 5900 : return trigAddress.objectId;
13784 : }
13785 :
13786 : /*
13787 : * createForeignKeyActionTriggers
13788 : * Create the referenced-side "action" triggers that implement a foreign
13789 : * key.
13790 : *
13791 : * Returns the OIDs of the so created triggers in *deleteTrigOid and
13792 : * *updateTrigOid.
13793 : */
13794 : static void
13795 3334 : createForeignKeyActionTriggers(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
13796 : Oid constraintOid, Oid indexOid,
13797 : Oid parentDelTrigger, Oid parentUpdTrigger,
13798 : Oid *deleteTrigOid, Oid *updateTrigOid)
13799 : {
13800 : CreateTrigStmt *fk_trigger;
13801 : ObjectAddress trigAddress;
13802 :
13803 : /*
13804 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
13805 : * DELETE action on the referenced table.
13806 : */
13807 3334 : fk_trigger = makeNode(CreateTrigStmt);
13808 3334 : fk_trigger->replace = false;
13809 3334 : fk_trigger->isconstraint = true;
13810 3334 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
13811 3334 : fk_trigger->relation = NULL;
13812 3334 : fk_trigger->args = NIL;
13813 3334 : fk_trigger->row = true;
13814 3334 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13815 3334 : fk_trigger->events = TRIGGER_TYPE_DELETE;
13816 3334 : fk_trigger->columns = NIL;
13817 3334 : fk_trigger->whenClause = NULL;
13818 3334 : fk_trigger->transitionRels = NIL;
13819 3334 : fk_trigger->constrrel = NULL;
13820 :
13821 3334 : switch (fkconstraint->fk_del_action)
13822 : {
13823 2700 : case FKCONSTR_ACTION_NOACTION:
13824 2700 : fk_trigger->deferrable = fkconstraint->deferrable;
13825 2700 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13826 2700 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_del");
13827 2700 : break;
13828 30 : case FKCONSTR_ACTION_RESTRICT:
13829 30 : fk_trigger->deferrable = false;
13830 30 : fk_trigger->initdeferred = false;
13831 30 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_del");
13832 30 : break;
13833 446 : case FKCONSTR_ACTION_CASCADE:
13834 446 : fk_trigger->deferrable = false;
13835 446 : fk_trigger->initdeferred = false;
13836 446 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_del");
13837 446 : break;
13838 98 : case FKCONSTR_ACTION_SETNULL:
13839 98 : fk_trigger->deferrable = false;
13840 98 : fk_trigger->initdeferred = false;
13841 98 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_del");
13842 98 : break;
13843 60 : case FKCONSTR_ACTION_SETDEFAULT:
13844 60 : fk_trigger->deferrable = false;
13845 60 : fk_trigger->initdeferred = false;
13846 60 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_del");
13847 60 : break;
13848 0 : default:
13849 0 : elog(ERROR, "unrecognized FK action type: %d",
13850 : (int) fkconstraint->fk_del_action);
13851 : break;
13852 : }
13853 :
13854 3334 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
13855 : constraintOid, indexOid, InvalidOid,
13856 : parentDelTrigger, NULL, true, false);
13857 3334 : if (deleteTrigOid)
13858 3334 : *deleteTrigOid = trigAddress.objectId;
13859 :
13860 : /* Make changes-so-far visible */
13861 3334 : CommandCounterIncrement();
13862 :
13863 : /*
13864 : * Build and execute a CREATE CONSTRAINT TRIGGER statement for the ON
13865 : * UPDATE action on the referenced table.
13866 : */
13867 3334 : fk_trigger = makeNode(CreateTrigStmt);
13868 3334 : fk_trigger->replace = false;
13869 3334 : fk_trigger->isconstraint = true;
13870 3334 : fk_trigger->trigname = "RI_ConstraintTrigger_a";
13871 3334 : fk_trigger->relation = NULL;
13872 3334 : fk_trigger->args = NIL;
13873 3334 : fk_trigger->row = true;
13874 3334 : fk_trigger->timing = TRIGGER_TYPE_AFTER;
13875 3334 : fk_trigger->events = TRIGGER_TYPE_UPDATE;
13876 3334 : fk_trigger->columns = NIL;
13877 3334 : fk_trigger->whenClause = NULL;
13878 3334 : fk_trigger->transitionRels = NIL;
13879 3334 : fk_trigger->constrrel = NULL;
13880 :
13881 3334 : switch (fkconstraint->fk_upd_action)
13882 : {
13883 2892 : case FKCONSTR_ACTION_NOACTION:
13884 2892 : fk_trigger->deferrable = fkconstraint->deferrable;
13885 2892 : fk_trigger->initdeferred = fkconstraint->initdeferred;
13886 2892 : fk_trigger->funcname = SystemFuncName("RI_FKey_noaction_upd");
13887 2892 : break;
13888 36 : case FKCONSTR_ACTION_RESTRICT:
13889 36 : fk_trigger->deferrable = false;
13890 36 : fk_trigger->initdeferred = false;
13891 36 : fk_trigger->funcname = SystemFuncName("RI_FKey_restrict_upd");
13892 36 : break;
13893 300 : case FKCONSTR_ACTION_CASCADE:
13894 300 : fk_trigger->deferrable = false;
13895 300 : fk_trigger->initdeferred = false;
13896 300 : fk_trigger->funcname = SystemFuncName("RI_FKey_cascade_upd");
13897 300 : break;
13898 64 : case FKCONSTR_ACTION_SETNULL:
13899 64 : fk_trigger->deferrable = false;
13900 64 : fk_trigger->initdeferred = false;
13901 64 : fk_trigger->funcname = SystemFuncName("RI_FKey_setnull_upd");
13902 64 : break;
13903 42 : case FKCONSTR_ACTION_SETDEFAULT:
13904 42 : fk_trigger->deferrable = false;
13905 42 : fk_trigger->initdeferred = false;
13906 42 : fk_trigger->funcname = SystemFuncName("RI_FKey_setdefault_upd");
13907 42 : break;
13908 0 : default:
13909 0 : elog(ERROR, "unrecognized FK action type: %d",
13910 : (int) fkconstraint->fk_upd_action);
13911 : break;
13912 : }
13913 :
13914 3334 : trigAddress = CreateTrigger(fk_trigger, NULL, refRelOid, myRelOid,
13915 : constraintOid, indexOid, InvalidOid,
13916 : parentUpdTrigger, NULL, true, false);
13917 3334 : if (updateTrigOid)
13918 3334 : *updateTrigOid = trigAddress.objectId;
13919 3334 : }
13920 :
13921 : /*
13922 : * createForeignKeyCheckTriggers
13923 : * Create the referencing-side "check" triggers that implement a foreign
13924 : * key.
13925 : *
13926 : * Returns the OIDs of the so created triggers in *insertTrigOid and
13927 : * *updateTrigOid.
13928 : */
13929 : static void
13930 2950 : createForeignKeyCheckTriggers(Oid myRelOid, Oid refRelOid,
13931 : Constraint *fkconstraint, Oid constraintOid,
13932 : Oid indexOid,
13933 : Oid parentInsTrigger, Oid parentUpdTrigger,
13934 : Oid *insertTrigOid, Oid *updateTrigOid)
13935 : {
13936 2950 : *insertTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
13937 : constraintOid, indexOid,
13938 : parentInsTrigger, true);
13939 2950 : *updateTrigOid = CreateFKCheckTrigger(myRelOid, refRelOid, fkconstraint,
13940 : constraintOid, indexOid,
13941 : parentUpdTrigger, false);
13942 2950 : }
13943 :
13944 : /*
13945 : * ALTER TABLE DROP CONSTRAINT
13946 : *
13947 : * Like DROP COLUMN, we can't use the normal ALTER TABLE recursion mechanism.
13948 : */
13949 : static void
13950 792 : ATExecDropConstraint(Relation rel, const char *constrName,
13951 : DropBehavior behavior, bool recurse,
13952 : bool missing_ok, LOCKMODE lockmode)
13953 : {
13954 : Relation conrel;
13955 : SysScanDesc scan;
13956 : ScanKeyData skey[3];
13957 : HeapTuple tuple;
13958 792 : bool found = false;
13959 :
13960 792 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
13961 :
13962 : /*
13963 : * Find and drop the target constraint
13964 : */
13965 792 : ScanKeyInit(&skey[0],
13966 : Anum_pg_constraint_conrelid,
13967 : BTEqualStrategyNumber, F_OIDEQ,
13968 : ObjectIdGetDatum(RelationGetRelid(rel)));
13969 792 : ScanKeyInit(&skey[1],
13970 : Anum_pg_constraint_contypid,
13971 : BTEqualStrategyNumber, F_OIDEQ,
13972 : ObjectIdGetDatum(InvalidOid));
13973 792 : ScanKeyInit(&skey[2],
13974 : Anum_pg_constraint_conname,
13975 : BTEqualStrategyNumber, F_NAMEEQ,
13976 : CStringGetDatum(constrName));
13977 792 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
13978 : true, NULL, 3, skey);
13979 :
13980 : /* There can be at most one matching row */
13981 792 : if (HeapTupleIsValid(tuple = systable_getnext(scan)))
13982 : {
13983 756 : dropconstraint_internal(rel, tuple, behavior, recurse, false,
13984 : missing_ok, lockmode);
13985 570 : found = true;
13986 : }
13987 :
13988 606 : systable_endscan(scan);
13989 :
13990 606 : if (!found)
13991 : {
13992 36 : if (!missing_ok)
13993 24 : ereport(ERROR,
13994 : errcode(ERRCODE_UNDEFINED_OBJECT),
13995 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
13996 : constrName, RelationGetRelationName(rel)));
13997 : else
13998 12 : ereport(NOTICE,
13999 : errmsg("constraint \"%s\" of relation \"%s\" does not exist, skipping",
14000 : constrName, RelationGetRelationName(rel)));
14001 : }
14002 :
14003 582 : table_close(conrel, RowExclusiveLock);
14004 582 : }
14005 :
14006 : /*
14007 : * Remove a constraint, using its pg_constraint tuple
14008 : *
14009 : * Implementation for ALTER TABLE DROP CONSTRAINT and ALTER TABLE ALTER COLUMN
14010 : * DROP NOT NULL.
14011 : *
14012 : * Returns the address of the constraint being removed.
14013 : */
14014 : static ObjectAddress
14015 1186 : dropconstraint_internal(Relation rel, HeapTuple constraintTup, DropBehavior behavior,
14016 : bool recurse, bool recursing, bool missing_ok,
14017 : LOCKMODE lockmode)
14018 : {
14019 : Relation conrel;
14020 : Form_pg_constraint con;
14021 : ObjectAddress conobj;
14022 : List *children;
14023 1186 : bool is_no_inherit_constraint = false;
14024 : char *constrName;
14025 1186 : char *colname = NULL;
14026 :
14027 : /* Guard against stack overflow due to overly deep inheritance tree. */
14028 1186 : check_stack_depth();
14029 :
14030 : /* At top level, permission check was done in ATPrepCmd, else do it */
14031 1186 : if (recursing)
14032 210 : ATSimplePermissions(AT_DropConstraint, rel,
14033 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
14034 :
14035 1180 : conrel = table_open(ConstraintRelationId, RowExclusiveLock);
14036 :
14037 1180 : con = (Form_pg_constraint) GETSTRUCT(constraintTup);
14038 1180 : constrName = NameStr(con->conname);
14039 :
14040 : /* Don't allow drop of inherited constraints */
14041 1180 : if (con->coninhcount > 0 && !recursing)
14042 156 : ereport(ERROR,
14043 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14044 : errmsg("cannot drop inherited constraint \"%s\" of relation \"%s\"",
14045 : constrName, RelationGetRelationName(rel))));
14046 :
14047 : /*
14048 : * Reset pg_constraint.attnotnull, if this is a not-null constraint.
14049 : *
14050 : * While doing that, we're in a good position to disallow dropping a not-
14051 : * null constraint underneath a primary key, a replica identity index, or
14052 : * a generated identity column.
14053 : */
14054 1024 : if (con->contype == CONSTRAINT_NOTNULL)
14055 : {
14056 314 : Relation attrel = table_open(AttributeRelationId, RowExclusiveLock);
14057 314 : AttrNumber attnum = extractNotNullColumn(constraintTup);
14058 : Bitmapset *pkattrs;
14059 : Bitmapset *irattrs;
14060 : HeapTuple atttup;
14061 : Form_pg_attribute attForm;
14062 :
14063 : /* save column name for recursion step */
14064 314 : colname = get_attname(RelationGetRelid(rel), attnum, false);
14065 :
14066 : /*
14067 : * Disallow if it's in the primary key. For partitioned tables we
14068 : * cannot rely solely on RelationGetIndexAttrBitmap, because it'll
14069 : * return NULL if the primary key is invalid; but we still need to
14070 : * protect not-null constraints under such a constraint, so check the
14071 : * slow way.
14072 : */
14073 314 : pkattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_PRIMARY_KEY);
14074 :
14075 314 : if (pkattrs == NULL &&
14076 278 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14077 : {
14078 18 : Oid pkindex = RelationGetPrimaryKeyIndex(rel, true);
14079 :
14080 18 : if (OidIsValid(pkindex))
14081 : {
14082 0 : Relation pk = relation_open(pkindex, AccessShareLock);
14083 :
14084 0 : pkattrs = NULL;
14085 0 : for (int i = 0; i < pk->rd_index->indnkeyatts; i++)
14086 0 : pkattrs = bms_add_member(pkattrs, pk->rd_index->indkey.values[i]);
14087 :
14088 0 : relation_close(pk, AccessShareLock);
14089 : }
14090 : }
14091 :
14092 350 : if (pkattrs &&
14093 36 : bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, pkattrs))
14094 24 : ereport(ERROR,
14095 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14096 : errmsg("column \"%s\" is in a primary key",
14097 : get_attname(RelationGetRelid(rel), attnum, false)));
14098 :
14099 : /* Disallow if it's in the replica identity */
14100 290 : irattrs = RelationGetIndexAttrBitmap(rel, INDEX_ATTR_BITMAP_IDENTITY_KEY);
14101 290 : if (bms_is_member(attnum - FirstLowInvalidHeapAttributeNumber, irattrs))
14102 12 : ereport(ERROR,
14103 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14104 : errmsg("column \"%s\" is in index used as replica identity",
14105 : get_attname(RelationGetRelid(rel), attnum, false)));
14106 :
14107 : /* Disallow if it's a GENERATED AS IDENTITY column */
14108 278 : atttup = SearchSysCacheCopyAttNum(RelationGetRelid(rel), attnum);
14109 278 : if (!HeapTupleIsValid(atttup))
14110 0 : elog(ERROR, "cache lookup failed for attribute %d of relation %u",
14111 : attnum, RelationGetRelid(rel));
14112 278 : attForm = (Form_pg_attribute) GETSTRUCT(atttup);
14113 278 : if (attForm->attidentity != '\0')
14114 0 : ereport(ERROR,
14115 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
14116 : errmsg("column \"%s\" of relation \"%s\" is an identity column",
14117 : get_attname(RelationGetRelid(rel), attnum,
14118 : false),
14119 : RelationGetRelationName(rel)));
14120 :
14121 : /* All good -- reset attnotnull if needed */
14122 278 : if (attForm->attnotnull)
14123 : {
14124 278 : attForm->attnotnull = false;
14125 278 : CatalogTupleUpdate(attrel, &atttup->t_self, atttup);
14126 : }
14127 :
14128 278 : table_close(attrel, RowExclusiveLock);
14129 : }
14130 :
14131 988 : is_no_inherit_constraint = con->connoinherit;
14132 :
14133 : /*
14134 : * If it's a foreign-key constraint, we'd better lock the referenced table
14135 : * and check that that's not in use, just as we've already done for the
14136 : * constrained table (else we might, eg, be dropping a trigger that has
14137 : * unfired events). But we can/must skip that in the self-referential
14138 : * case.
14139 : */
14140 988 : if (con->contype == CONSTRAINT_FOREIGN &&
14141 168 : con->confrelid != RelationGetRelid(rel))
14142 : {
14143 : Relation frel;
14144 :
14145 : /* Must match lock taken by RemoveTriggerById: */
14146 168 : frel = table_open(con->confrelid, AccessExclusiveLock);
14147 168 : CheckAlterTableIsSafe(frel);
14148 162 : table_close(frel, NoLock);
14149 : }
14150 :
14151 : /*
14152 : * Perform the actual constraint deletion
14153 : */
14154 982 : ObjectAddressSet(conobj, ConstraintRelationId, con->oid);
14155 982 : performDeletion(&conobj, behavior, 0);
14156 :
14157 : /*
14158 : * For partitioned tables, non-CHECK, non-NOT-NULL inherited constraints
14159 : * are dropped via the dependency mechanism, so we're done here.
14160 : */
14161 946 : if (con->contype != CONSTRAINT_CHECK &&
14162 628 : con->contype != CONSTRAINT_NOTNULL &&
14163 350 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
14164 : {
14165 78 : table_close(conrel, RowExclusiveLock);
14166 78 : return conobj;
14167 : }
14168 :
14169 : /*
14170 : * Propagate to children as appropriate. Unlike most other ALTER
14171 : * routines, we have to do this one level of recursion at a time; we can't
14172 : * use find_all_inheritors to do it in one pass.
14173 : */
14174 868 : if (!is_no_inherit_constraint)
14175 584 : children = find_inheritance_children(RelationGetRelid(rel), lockmode);
14176 : else
14177 284 : children = NIL;
14178 :
14179 2108 : foreach_oid(childrelid, children)
14180 : {
14181 : Relation childrel;
14182 : HeapTuple tuple;
14183 : Form_pg_constraint childcon;
14184 :
14185 : /* find_inheritance_children already got lock */
14186 384 : childrel = table_open(childrelid, NoLock);
14187 384 : CheckAlterTableIsSafe(childrel);
14188 :
14189 : /*
14190 : * We search for not-null constraints by column name, and others by
14191 : * constraint name.
14192 : */
14193 384 : if (con->contype == CONSTRAINT_NOTNULL)
14194 : {
14195 148 : tuple = findNotNullConstraint(childrelid, colname);
14196 148 : if (!HeapTupleIsValid(tuple))
14197 0 : elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
14198 : colname, RelationGetRelid(childrel));
14199 : }
14200 : else
14201 : {
14202 : SysScanDesc scan;
14203 : ScanKeyData skey[3];
14204 :
14205 236 : ScanKeyInit(&skey[0],
14206 : Anum_pg_constraint_conrelid,
14207 : BTEqualStrategyNumber, F_OIDEQ,
14208 : ObjectIdGetDatum(childrelid));
14209 236 : ScanKeyInit(&skey[1],
14210 : Anum_pg_constraint_contypid,
14211 : BTEqualStrategyNumber, F_OIDEQ,
14212 : ObjectIdGetDatum(InvalidOid));
14213 236 : ScanKeyInit(&skey[2],
14214 : Anum_pg_constraint_conname,
14215 : BTEqualStrategyNumber, F_NAMEEQ,
14216 : CStringGetDatum(constrName));
14217 236 : scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
14218 : true, NULL, 3, skey);
14219 : /* There can only be one, so no need to loop */
14220 236 : tuple = systable_getnext(scan);
14221 236 : if (!HeapTupleIsValid(tuple))
14222 0 : ereport(ERROR,
14223 : (errcode(ERRCODE_UNDEFINED_OBJECT),
14224 : errmsg("constraint \"%s\" of relation \"%s\" does not exist",
14225 : constrName,
14226 : RelationGetRelationName(childrel))));
14227 236 : tuple = heap_copytuple(tuple);
14228 236 : systable_endscan(scan);
14229 : }
14230 :
14231 384 : childcon = (Form_pg_constraint) GETSTRUCT(tuple);
14232 :
14233 : /* Right now only CHECK and not-null constraints can be inherited */
14234 384 : if (childcon->contype != CONSTRAINT_CHECK &&
14235 148 : childcon->contype != CONSTRAINT_NOTNULL)
14236 0 : elog(ERROR, "inherited constraint is not a CHECK or not-null constraint");
14237 :
14238 384 : if (childcon->coninhcount <= 0) /* shouldn't happen */
14239 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
14240 : childrelid, NameStr(childcon->conname));
14241 :
14242 384 : if (recurse)
14243 : {
14244 : /*
14245 : * If the child constraint has other definition sources, just
14246 : * decrement its inheritance count; if not, recurse to delete it.
14247 : */
14248 282 : if (childcon->coninhcount == 1 && !childcon->conislocal)
14249 : {
14250 : /* Time to delete this child constraint, too */
14251 210 : dropconstraint_internal(childrel, tuple, behavior,
14252 : recurse, true, missing_ok,
14253 : lockmode);
14254 : }
14255 : else
14256 : {
14257 : /* Child constraint must survive my deletion */
14258 72 : childcon->coninhcount--;
14259 72 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14260 :
14261 : /* Make update visible */
14262 72 : CommandCounterIncrement();
14263 : }
14264 : }
14265 : else
14266 : {
14267 : /*
14268 : * If we were told to drop ONLY in this table (no recursion) and
14269 : * there are no further parents for this constraint, we need to
14270 : * mark the inheritors' constraints as locally defined rather than
14271 : * inherited.
14272 : */
14273 102 : childcon->coninhcount--;
14274 102 : if (childcon->coninhcount == 0)
14275 102 : childcon->conislocal = true;
14276 :
14277 102 : CatalogTupleUpdate(conrel, &tuple->t_self, tuple);
14278 :
14279 : /* Make update visible */
14280 102 : CommandCounterIncrement();
14281 : }
14282 :
14283 378 : heap_freetuple(tuple);
14284 :
14285 378 : table_close(childrel, NoLock);
14286 : }
14287 :
14288 862 : table_close(conrel, RowExclusiveLock);
14289 :
14290 862 : return conobj;
14291 : }
14292 :
14293 : /*
14294 : * ALTER COLUMN TYPE
14295 : *
14296 : * Unlike other subcommand types, we do parse transformation for ALTER COLUMN
14297 : * TYPE during phase 1 --- the AlterTableCmd passed in here is already
14298 : * transformed (and must be, because we rely on some transformed fields).
14299 : *
14300 : * The point of this is that the execution of all ALTER COLUMN TYPEs for a
14301 : * table will be done "in parallel" during phase 3, so all the USING
14302 : * expressions should be parsed assuming the original column types. Also,
14303 : * this allows a USING expression to refer to a field that will be dropped.
14304 : *
14305 : * To make this work safely, AT_PASS_DROP then AT_PASS_ALTER_TYPE must be
14306 : * the first two execution steps in phase 2; they must not see the effects
14307 : * of any other subcommand types, since the USING expressions are parsed
14308 : * against the unmodified table's state.
14309 : */
14310 : static void
14311 1282 : ATPrepAlterColumnType(List **wqueue,
14312 : AlteredTableInfo *tab, Relation rel,
14313 : bool recurse, bool recursing,
14314 : AlterTableCmd *cmd, LOCKMODE lockmode,
14315 : AlterTableUtilityContext *context)
14316 : {
14317 1282 : char *colName = cmd->name;
14318 1282 : ColumnDef *def = (ColumnDef *) cmd->def;
14319 1282 : TypeName *typeName = def->typeName;
14320 1282 : Node *transform = def->cooked_default;
14321 : HeapTuple tuple;
14322 : Form_pg_attribute attTup;
14323 : AttrNumber attnum;
14324 : Oid targettype;
14325 : int32 targettypmod;
14326 : Oid targetcollid;
14327 : NewColumnValue *newval;
14328 1282 : ParseState *pstate = make_parsestate(NULL);
14329 : AclResult aclresult;
14330 : bool is_expr;
14331 :
14332 1282 : pstate->p_sourcetext = context->queryString;
14333 :
14334 1282 : if (rel->rd_rel->reloftype && !recursing)
14335 6 : ereport(ERROR,
14336 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14337 : errmsg("cannot alter column type of typed table"),
14338 : parser_errposition(pstate, def->location)));
14339 :
14340 : /* lookup the attribute so we can check inheritance status */
14341 1276 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
14342 1276 : if (!HeapTupleIsValid(tuple))
14343 0 : ereport(ERROR,
14344 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14345 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14346 : colName, RelationGetRelationName(rel)),
14347 : parser_errposition(pstate, def->location)));
14348 1276 : attTup = (Form_pg_attribute) GETSTRUCT(tuple);
14349 1276 : attnum = attTup->attnum;
14350 :
14351 : /* Can't alter a system attribute */
14352 1276 : if (attnum <= 0)
14353 6 : ereport(ERROR,
14354 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14355 : errmsg("cannot alter system column \"%s\"", colName),
14356 : parser_errposition(pstate, def->location)));
14357 :
14358 : /*
14359 : * Cannot specify USING when altering type of a generated column, because
14360 : * that would violate the generation expression.
14361 : */
14362 1270 : if (attTup->attgenerated && def->cooked_default)
14363 12 : ereport(ERROR,
14364 : (errcode(ERRCODE_INVALID_COLUMN_DEFINITION),
14365 : errmsg("cannot specify USING when altering type of generated column"),
14366 : errdetail("Column \"%s\" is a generated column.", colName),
14367 : parser_errposition(pstate, def->location)));
14368 :
14369 : /*
14370 : * Don't alter inherited columns. At outer level, there had better not be
14371 : * any inherited definition; when recursing, we assume this was checked at
14372 : * the parent level (see below).
14373 : */
14374 1258 : if (attTup->attinhcount > 0 && !recursing)
14375 6 : ereport(ERROR,
14376 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14377 : errmsg("cannot alter inherited column \"%s\"", colName),
14378 : parser_errposition(pstate, def->location)));
14379 :
14380 : /* Don't alter columns used in the partition key */
14381 1252 : if (has_partition_attrs(rel,
14382 : bms_make_singleton(attnum - FirstLowInvalidHeapAttributeNumber),
14383 : &is_expr))
14384 18 : ereport(ERROR,
14385 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14386 : errmsg("cannot alter column \"%s\" because it is part of the partition key of relation \"%s\"",
14387 : colName, RelationGetRelationName(rel)),
14388 : parser_errposition(pstate, def->location)));
14389 :
14390 : /* Look up the target type */
14391 1234 : typenameTypeIdAndMod(pstate, typeName, &targettype, &targettypmod);
14392 :
14393 1228 : aclresult = object_aclcheck(TypeRelationId, targettype, GetUserId(), ACL_USAGE);
14394 1228 : if (aclresult != ACLCHECK_OK)
14395 12 : aclcheck_error_type(aclresult, targettype);
14396 :
14397 : /* And the collation */
14398 1216 : targetcollid = GetColumnDefCollation(pstate, def, targettype);
14399 :
14400 : /* make sure datatype is legal for a column */
14401 1210 : CheckAttributeType(colName, targettype, targetcollid,
14402 1210 : list_make1_oid(rel->rd_rel->reltype),
14403 : 0);
14404 :
14405 1204 : if (attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14406 : {
14407 : /* do nothing */
14408 : }
14409 1168 : else if (tab->relkind == RELKIND_RELATION ||
14410 202 : tab->relkind == RELKIND_PARTITIONED_TABLE)
14411 : {
14412 : /*
14413 : * Set up an expression to transform the old data value to the new
14414 : * type. If a USING option was given, use the expression as
14415 : * transformed by transformAlterTableStmt, else just take the old
14416 : * value and try to coerce it. We do this first so that type
14417 : * incompatibility can be detected before we waste effort, and because
14418 : * we need the expression to be parsed against the original table row
14419 : * type.
14420 : */
14421 1032 : if (!transform)
14422 : {
14423 810 : transform = (Node *) makeVar(1, attnum,
14424 : attTup->atttypid, attTup->atttypmod,
14425 : attTup->attcollation,
14426 : 0);
14427 : }
14428 :
14429 1032 : transform = coerce_to_target_type(pstate,
14430 : transform, exprType(transform),
14431 : targettype, targettypmod,
14432 : COERCION_ASSIGNMENT,
14433 : COERCE_IMPLICIT_CAST,
14434 : -1);
14435 1032 : if (transform == NULL)
14436 : {
14437 : /* error text depends on whether USING was specified or not */
14438 24 : if (def->cooked_default != NULL)
14439 6 : ereport(ERROR,
14440 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14441 : errmsg("result of USING clause for column \"%s\""
14442 : " cannot be cast automatically to type %s",
14443 : colName, format_type_be(targettype)),
14444 : errhint("You might need to add an explicit cast.")));
14445 : else
14446 18 : ereport(ERROR,
14447 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14448 : errmsg("column \"%s\" cannot be cast automatically to type %s",
14449 : colName, format_type_be(targettype)),
14450 : !attTup->attgenerated ?
14451 : /* translator: USING is SQL, don't translate it */
14452 : errhint("You might need to specify \"USING %s::%s\".",
14453 : quote_identifier(colName),
14454 : format_type_with_typemod(targettype,
14455 : targettypmod)) : 0));
14456 : }
14457 :
14458 : /* Fix collations after all else */
14459 1008 : assign_expr_collations(pstate, transform);
14460 :
14461 : /* Plan the expr now so we can accurately assess the need to rewrite. */
14462 1008 : transform = (Node *) expression_planner((Expr *) transform);
14463 :
14464 : /*
14465 : * Add a work queue item to make ATRewriteTable update the column
14466 : * contents.
14467 : */
14468 1008 : newval = (NewColumnValue *) palloc0(sizeof(NewColumnValue));
14469 1008 : newval->attnum = attnum;
14470 1008 : newval->expr = (Expr *) transform;
14471 1008 : newval->is_generated = false;
14472 :
14473 1008 : tab->newvals = lappend(tab->newvals, newval);
14474 1008 : if (ATColumnChangeRequiresRewrite(transform, attnum))
14475 812 : tab->rewrite |= AT_REWRITE_COLUMN_REWRITE;
14476 : }
14477 136 : else if (transform)
14478 12 : ereport(ERROR,
14479 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
14480 : errmsg("\"%s\" is not a table",
14481 : RelationGetRelationName(rel))));
14482 :
14483 1168 : if (!RELKIND_HAS_STORAGE(tab->relkind) || attTup->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
14484 : {
14485 : /*
14486 : * For relations or columns without storage, do this check now.
14487 : * Regular tables will check it later when the table is being
14488 : * rewritten.
14489 : */
14490 226 : find_composite_type_dependencies(rel->rd_rel->reltype, rel, NULL);
14491 : }
14492 :
14493 1120 : ReleaseSysCache(tuple);
14494 :
14495 : /*
14496 : * Recurse manually by queueing a new command for each child, if
14497 : * necessary. We cannot apply ATSimpleRecursion here because we need to
14498 : * remap attribute numbers in the USING expression, if any.
14499 : *
14500 : * If we are told not to recurse, there had better not be any child
14501 : * tables; else the alter would put them out of step.
14502 : */
14503 1120 : if (recurse)
14504 : {
14505 862 : Oid relid = RelationGetRelid(rel);
14506 : List *child_oids,
14507 : *child_numparents;
14508 : ListCell *lo,
14509 : *li;
14510 :
14511 862 : child_oids = find_all_inheritors(relid, lockmode,
14512 : &child_numparents);
14513 :
14514 : /*
14515 : * find_all_inheritors does the recursive search of the inheritance
14516 : * hierarchy, so all we have to do is process all of the relids in the
14517 : * list that it returns.
14518 : */
14519 1932 : forboth(lo, child_oids, li, child_numparents)
14520 : {
14521 1094 : Oid childrelid = lfirst_oid(lo);
14522 1094 : int numparents = lfirst_int(li);
14523 : Relation childrel;
14524 : HeapTuple childtuple;
14525 : Form_pg_attribute childattTup;
14526 :
14527 1094 : if (childrelid == relid)
14528 862 : continue;
14529 :
14530 : /* find_all_inheritors already got lock */
14531 232 : childrel = relation_open(childrelid, NoLock);
14532 232 : CheckAlterTableIsSafe(childrel);
14533 :
14534 : /*
14535 : * Verify that the child doesn't have any inherited definitions of
14536 : * this column that came from outside this inheritance hierarchy.
14537 : * (renameatt makes a similar test, though in a different way
14538 : * because of its different recursion mechanism.)
14539 : */
14540 232 : childtuple = SearchSysCacheAttName(RelationGetRelid(childrel),
14541 : colName);
14542 232 : if (!HeapTupleIsValid(childtuple))
14543 0 : ereport(ERROR,
14544 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14545 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14546 : colName, RelationGetRelationName(childrel))));
14547 232 : childattTup = (Form_pg_attribute) GETSTRUCT(childtuple);
14548 :
14549 232 : if (childattTup->attinhcount > numparents)
14550 6 : ereport(ERROR,
14551 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14552 : errmsg("cannot alter inherited column \"%s\" of relation \"%s\"",
14553 : colName, RelationGetRelationName(childrel))));
14554 :
14555 226 : ReleaseSysCache(childtuple);
14556 :
14557 : /*
14558 : * Remap the attribute numbers. If no USING expression was
14559 : * specified, there is no need for this step.
14560 : */
14561 226 : if (def->cooked_default)
14562 : {
14563 : AttrMap *attmap;
14564 : bool found_whole_row;
14565 :
14566 : /* create a copy to scribble on */
14567 78 : cmd = copyObject(cmd);
14568 :
14569 78 : attmap = build_attrmap_by_name(RelationGetDescr(childrel),
14570 : RelationGetDescr(rel),
14571 : false);
14572 156 : ((ColumnDef *) cmd->def)->cooked_default =
14573 78 : map_variable_attnos(def->cooked_default,
14574 : 1, 0,
14575 : attmap,
14576 : InvalidOid, &found_whole_row);
14577 78 : if (found_whole_row)
14578 6 : ereport(ERROR,
14579 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14580 : errmsg("cannot convert whole-row table reference"),
14581 : errdetail("USING expression contains a whole-row table reference.")));
14582 72 : pfree(attmap);
14583 : }
14584 220 : ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
14585 208 : relation_close(childrel, NoLock);
14586 : }
14587 : }
14588 308 : else if (!recursing &&
14589 50 : find_inheritance_children(RelationGetRelid(rel), NoLock) != NIL)
14590 0 : ereport(ERROR,
14591 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
14592 : errmsg("type of inherited column \"%s\" must be changed in child tables too",
14593 : colName)));
14594 :
14595 1096 : if (tab->relkind == RELKIND_COMPOSITE_TYPE)
14596 50 : ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
14597 1090 : }
14598 :
14599 : /*
14600 : * When the data type of a column is changed, a rewrite might not be required
14601 : * if the new type is sufficiently identical to the old one, and the USING
14602 : * clause isn't trying to insert some other value. It's safe to skip the
14603 : * rewrite in these cases:
14604 : *
14605 : * - the old type is binary coercible to the new type
14606 : * - the new type is an unconstrained domain over the old type
14607 : * - {NEW,OLD} or {OLD,NEW} is {timestamptz,timestamp} and the timezone is UTC
14608 : *
14609 : * In the case of a constrained domain, we could get by with scanning the
14610 : * table and checking the constraint rather than actually rewriting it, but we
14611 : * don't currently try to do that.
14612 : */
14613 : static bool
14614 1126 : ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno)
14615 : {
14616 : Assert(expr != NULL);
14617 :
14618 : for (;;)
14619 : {
14620 : /* only one varno, so no need to check that */
14621 1126 : if (IsA(expr, Var) && ((Var *) expr)->varattno == varattno)
14622 196 : return false;
14623 930 : else if (IsA(expr, RelabelType))
14624 106 : expr = (Node *) ((RelabelType *) expr)->arg;
14625 824 : else if (IsA(expr, CoerceToDomain))
14626 : {
14627 0 : CoerceToDomain *d = (CoerceToDomain *) expr;
14628 :
14629 0 : if (DomainHasConstraints(d->resulttype))
14630 0 : return true;
14631 0 : expr = (Node *) d->arg;
14632 : }
14633 824 : else if (IsA(expr, FuncExpr))
14634 : {
14635 618 : FuncExpr *f = (FuncExpr *) expr;
14636 :
14637 618 : switch (f->funcid)
14638 : {
14639 18 : case F_TIMESTAMPTZ_TIMESTAMP:
14640 : case F_TIMESTAMP_TIMESTAMPTZ:
14641 18 : if (TimestampTimestampTzRequiresRewrite())
14642 6 : return true;
14643 : else
14644 12 : expr = linitial(f->args);
14645 12 : break;
14646 600 : default:
14647 600 : return true;
14648 : }
14649 : }
14650 : else
14651 206 : return true;
14652 : }
14653 : }
14654 :
14655 : /*
14656 : * ALTER COLUMN .. SET DATA TYPE
14657 : *
14658 : * Return the address of the modified column.
14659 : */
14660 : static ObjectAddress
14661 1054 : ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
14662 : AlterTableCmd *cmd, LOCKMODE lockmode)
14663 : {
14664 1054 : char *colName = cmd->name;
14665 1054 : ColumnDef *def = (ColumnDef *) cmd->def;
14666 1054 : TypeName *typeName = def->typeName;
14667 : HeapTuple heapTup;
14668 : Form_pg_attribute attTup,
14669 : attOldTup;
14670 : AttrNumber attnum;
14671 : HeapTuple typeTuple;
14672 : Form_pg_type tform;
14673 : Oid targettype;
14674 : int32 targettypmod;
14675 : Oid targetcollid;
14676 : Node *defaultexpr;
14677 : Relation attrelation;
14678 : Relation depRel;
14679 : ScanKeyData key[3];
14680 : SysScanDesc scan;
14681 : HeapTuple depTup;
14682 : ObjectAddress address;
14683 :
14684 : /*
14685 : * Clear all the missing values if we're rewriting the table, since this
14686 : * renders them pointless.
14687 : */
14688 1054 : if (tab->rewrite)
14689 : {
14690 : Relation newrel;
14691 :
14692 752 : newrel = table_open(RelationGetRelid(rel), NoLock);
14693 752 : RelationClearMissing(newrel);
14694 752 : relation_close(newrel, NoLock);
14695 : /* make sure we don't conflict with later attribute modifications */
14696 752 : CommandCounterIncrement();
14697 : }
14698 :
14699 1054 : attrelation = table_open(AttributeRelationId, RowExclusiveLock);
14700 :
14701 : /* Look up the target column */
14702 1054 : heapTup = SearchSysCacheCopyAttName(RelationGetRelid(rel), colName);
14703 1054 : if (!HeapTupleIsValid(heapTup)) /* shouldn't happen */
14704 0 : ereport(ERROR,
14705 : (errcode(ERRCODE_UNDEFINED_COLUMN),
14706 : errmsg("column \"%s\" of relation \"%s\" does not exist",
14707 : colName, RelationGetRelationName(rel))));
14708 1054 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
14709 1054 : attnum = attTup->attnum;
14710 1054 : attOldTup = TupleDescAttr(tab->oldDesc, attnum - 1);
14711 :
14712 : /* Check for multiple ALTER TYPE on same column --- can't cope */
14713 1054 : if (attTup->atttypid != attOldTup->atttypid ||
14714 1054 : attTup->atttypmod != attOldTup->atttypmod)
14715 0 : ereport(ERROR,
14716 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
14717 : errmsg("cannot alter type of column \"%s\" twice",
14718 : colName)));
14719 :
14720 : /* Look up the target type (should not fail, since prep found it) */
14721 1054 : typeTuple = typenameType(NULL, typeName, &targettypmod);
14722 1054 : tform = (Form_pg_type) GETSTRUCT(typeTuple);
14723 1054 : targettype = tform->oid;
14724 : /* And the collation */
14725 1054 : targetcollid = GetColumnDefCollation(NULL, def, targettype);
14726 :
14727 : /*
14728 : * If there is a default expression for the column, get it and ensure we
14729 : * can coerce it to the new datatype. (We must do this before changing
14730 : * the column type, because build_column_default itself will try to
14731 : * coerce, and will not issue the error message we want if it fails.)
14732 : *
14733 : * We remove any implicit coercion steps at the top level of the old
14734 : * default expression; this has been agreed to satisfy the principle of
14735 : * least surprise. (The conversion to the new column type should act like
14736 : * it started from what the user sees as the stored expression, and the
14737 : * implicit coercions aren't going to be shown.)
14738 : */
14739 1054 : if (attTup->atthasdef)
14740 : {
14741 92 : defaultexpr = build_column_default(rel, attnum);
14742 : Assert(defaultexpr);
14743 92 : defaultexpr = strip_implicit_coercions(defaultexpr);
14744 92 : defaultexpr = coerce_to_target_type(NULL, /* no UNKNOWN params */
14745 : defaultexpr, exprType(defaultexpr),
14746 : targettype, targettypmod,
14747 : COERCION_ASSIGNMENT,
14748 : COERCE_IMPLICIT_CAST,
14749 : -1);
14750 92 : if (defaultexpr == NULL)
14751 : {
14752 6 : if (attTup->attgenerated)
14753 0 : ereport(ERROR,
14754 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14755 : errmsg("generation expression for column \"%s\" cannot be cast automatically to type %s",
14756 : colName, format_type_be(targettype))));
14757 : else
14758 6 : ereport(ERROR,
14759 : (errcode(ERRCODE_DATATYPE_MISMATCH),
14760 : errmsg("default for column \"%s\" cannot be cast automatically to type %s",
14761 : colName, format_type_be(targettype))));
14762 : }
14763 : }
14764 : else
14765 962 : defaultexpr = NULL;
14766 :
14767 : /*
14768 : * Find everything that depends on the column (constraints, indexes, etc),
14769 : * and record enough information to let us recreate the objects.
14770 : *
14771 : * The actual recreation does not happen here, but only after we have
14772 : * performed all the individual ALTER TYPE operations. We have to save
14773 : * the info before executing ALTER TYPE, though, else the deparser will
14774 : * get confused.
14775 : */
14776 1048 : RememberAllDependentForRebuilding(tab, AT_AlterColumnType, rel, attnum, colName);
14777 :
14778 : /*
14779 : * Now scan for dependencies of this column on other things. The only
14780 : * things we should find are the dependency on the column datatype and
14781 : * possibly a collation dependency. Those can be removed.
14782 : */
14783 1012 : depRel = table_open(DependRelationId, RowExclusiveLock);
14784 :
14785 1012 : ScanKeyInit(&key[0],
14786 : Anum_pg_depend_classid,
14787 : BTEqualStrategyNumber, F_OIDEQ,
14788 : ObjectIdGetDatum(RelationRelationId));
14789 1012 : ScanKeyInit(&key[1],
14790 : Anum_pg_depend_objid,
14791 : BTEqualStrategyNumber, F_OIDEQ,
14792 : ObjectIdGetDatum(RelationGetRelid(rel)));
14793 1012 : ScanKeyInit(&key[2],
14794 : Anum_pg_depend_objsubid,
14795 : BTEqualStrategyNumber, F_INT4EQ,
14796 : Int32GetDatum((int32) attnum));
14797 :
14798 1012 : scan = systable_beginscan(depRel, DependDependerIndexId, true,
14799 : NULL, 3, key);
14800 :
14801 1016 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
14802 : {
14803 4 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
14804 : ObjectAddress foundObject;
14805 :
14806 4 : foundObject.classId = foundDep->refclassid;
14807 4 : foundObject.objectId = foundDep->refobjid;
14808 4 : foundObject.objectSubId = foundDep->refobjsubid;
14809 :
14810 4 : if (foundDep->deptype != DEPENDENCY_NORMAL)
14811 0 : elog(ERROR, "found unexpected dependency type '%c'",
14812 : foundDep->deptype);
14813 4 : if (!(foundDep->refclassid == TypeRelationId &&
14814 4 : foundDep->refobjid == attTup->atttypid) &&
14815 0 : !(foundDep->refclassid == CollationRelationId &&
14816 0 : foundDep->refobjid == attTup->attcollation))
14817 0 : elog(ERROR, "found unexpected dependency for column: %s",
14818 : getObjectDescription(&foundObject, false));
14819 :
14820 4 : CatalogTupleDelete(depRel, &depTup->t_self);
14821 : }
14822 :
14823 1012 : systable_endscan(scan);
14824 :
14825 1012 : table_close(depRel, RowExclusiveLock);
14826 :
14827 : /*
14828 : * Here we go --- change the recorded column type and collation. (Note
14829 : * heapTup is a copy of the syscache entry, so okay to scribble on.) First
14830 : * fix up the missing value if any.
14831 : */
14832 1012 : if (attTup->atthasmissing)
14833 : {
14834 : Datum missingval;
14835 : bool missingNull;
14836 :
14837 : /* if rewrite is true the missing value should already be cleared */
14838 : Assert(tab->rewrite == 0);
14839 :
14840 : /* Get the missing value datum */
14841 6 : missingval = heap_getattr(heapTup,
14842 : Anum_pg_attribute_attmissingval,
14843 : attrelation->rd_att,
14844 : &missingNull);
14845 :
14846 : /* if it's a null array there is nothing to do */
14847 :
14848 6 : if (!missingNull)
14849 : {
14850 : /*
14851 : * Get the datum out of the array and repack it in a new array
14852 : * built with the new type data. We assume that since the table
14853 : * doesn't need rewriting, the actual Datum doesn't need to be
14854 : * changed, only the array metadata.
14855 : */
14856 :
14857 6 : int one = 1;
14858 : bool isNull;
14859 6 : Datum valuesAtt[Natts_pg_attribute] = {0};
14860 6 : bool nullsAtt[Natts_pg_attribute] = {0};
14861 6 : bool replacesAtt[Natts_pg_attribute] = {0};
14862 : HeapTuple newTup;
14863 :
14864 12 : missingval = array_get_element(missingval,
14865 : 1,
14866 : &one,
14867 : 0,
14868 6 : attTup->attlen,
14869 6 : attTup->attbyval,
14870 6 : attTup->attalign,
14871 : &isNull);
14872 6 : missingval = PointerGetDatum(construct_array(&missingval,
14873 : 1,
14874 : targettype,
14875 6 : tform->typlen,
14876 6 : tform->typbyval,
14877 6 : tform->typalign));
14878 :
14879 6 : valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
14880 6 : replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;
14881 6 : nullsAtt[Anum_pg_attribute_attmissingval - 1] = false;
14882 :
14883 6 : newTup = heap_modify_tuple(heapTup, RelationGetDescr(attrelation),
14884 : valuesAtt, nullsAtt, replacesAtt);
14885 6 : heap_freetuple(heapTup);
14886 6 : heapTup = newTup;
14887 6 : attTup = (Form_pg_attribute) GETSTRUCT(heapTup);
14888 : }
14889 : }
14890 :
14891 1012 : attTup->atttypid = targettype;
14892 1012 : attTup->atttypmod = targettypmod;
14893 1012 : attTup->attcollation = targetcollid;
14894 1012 : if (list_length(typeName->arrayBounds) > PG_INT16_MAX)
14895 0 : ereport(ERROR,
14896 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
14897 : errmsg("too many array dimensions"));
14898 1012 : attTup->attndims = list_length(typeName->arrayBounds);
14899 1012 : attTup->attlen = tform->typlen;
14900 1012 : attTup->attbyval = tform->typbyval;
14901 1012 : attTup->attalign = tform->typalign;
14902 1012 : attTup->attstorage = tform->typstorage;
14903 1012 : attTup->attcompression = InvalidCompressionMethod;
14904 :
14905 1012 : ReleaseSysCache(typeTuple);
14906 :
14907 1012 : CatalogTupleUpdate(attrelation, &heapTup->t_self, heapTup);
14908 :
14909 1012 : table_close(attrelation, RowExclusiveLock);
14910 :
14911 : /* Install dependencies on new datatype and collation */
14912 1012 : add_column_datatype_dependency(RelationGetRelid(rel), attnum, targettype);
14913 1012 : add_column_collation_dependency(RelationGetRelid(rel), attnum, targetcollid);
14914 :
14915 : /*
14916 : * Drop any pg_statistic entry for the column, since it's now wrong type
14917 : */
14918 1012 : RemoveStatistics(RelationGetRelid(rel), attnum);
14919 :
14920 1012 : InvokeObjectPostAlterHook(RelationRelationId,
14921 : RelationGetRelid(rel), attnum);
14922 :
14923 : /*
14924 : * Update the default, if present, by brute force --- remove and re-add
14925 : * the default. Probably unsafe to take shortcuts, since the new version
14926 : * may well have additional dependencies. (It's okay to do this now,
14927 : * rather than after other ALTER TYPE commands, since the default won't
14928 : * depend on other column types.)
14929 : */
14930 1012 : if (defaultexpr)
14931 : {
14932 : /*
14933 : * If it's a GENERATED default, drop its dependency records, in
14934 : * particular its INTERNAL dependency on the column, which would
14935 : * otherwise cause dependency.c to refuse to perform the deletion.
14936 : */
14937 86 : if (attTup->attgenerated)
14938 : {
14939 36 : Oid attrdefoid = GetAttrDefaultOid(RelationGetRelid(rel), attnum);
14940 :
14941 36 : if (!OidIsValid(attrdefoid))
14942 0 : elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
14943 : RelationGetRelid(rel), attnum);
14944 36 : (void) deleteDependencyRecordsFor(AttrDefaultRelationId, attrdefoid, false);
14945 : }
14946 :
14947 : /*
14948 : * Make updates-so-far visible, particularly the new pg_attribute row
14949 : * which will be updated again.
14950 : */
14951 86 : CommandCounterIncrement();
14952 :
14953 : /*
14954 : * We use RESTRICT here for safety, but at present we do not expect
14955 : * anything to depend on the default.
14956 : */
14957 86 : RemoveAttrDefault(RelationGetRelid(rel), attnum, DROP_RESTRICT, true,
14958 : true);
14959 :
14960 86 : (void) StoreAttrDefault(rel, attnum, defaultexpr, true);
14961 : }
14962 :
14963 1012 : ObjectAddressSubSet(address, RelationRelationId,
14964 : RelationGetRelid(rel), attnum);
14965 :
14966 : /* Cleanup */
14967 1012 : heap_freetuple(heapTup);
14968 :
14969 1012 : return address;
14970 : }
14971 :
14972 : /*
14973 : * Subroutine for ATExecAlterColumnType and ATExecSetExpression: Find everything
14974 : * that depends on the column (constraints, indexes, etc), and record enough
14975 : * information to let us recreate the objects.
14976 : */
14977 : static void
14978 1126 : RememberAllDependentForRebuilding(AlteredTableInfo *tab, AlterTableType subtype,
14979 : Relation rel, AttrNumber attnum, const char *colName)
14980 : {
14981 : Relation depRel;
14982 : ScanKeyData key[3];
14983 : SysScanDesc scan;
14984 : HeapTuple depTup;
14985 :
14986 : Assert(subtype == AT_AlterColumnType || subtype == AT_SetExpression);
14987 :
14988 1126 : depRel = table_open(DependRelationId, RowExclusiveLock);
14989 :
14990 1126 : ScanKeyInit(&key[0],
14991 : Anum_pg_depend_refclassid,
14992 : BTEqualStrategyNumber, F_OIDEQ,
14993 : ObjectIdGetDatum(RelationRelationId));
14994 1126 : ScanKeyInit(&key[1],
14995 : Anum_pg_depend_refobjid,
14996 : BTEqualStrategyNumber, F_OIDEQ,
14997 : ObjectIdGetDatum(RelationGetRelid(rel)));
14998 1126 : ScanKeyInit(&key[2],
14999 : Anum_pg_depend_refobjsubid,
15000 : BTEqualStrategyNumber, F_INT4EQ,
15001 : Int32GetDatum((int32) attnum));
15002 :
15003 1126 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
15004 : NULL, 3, key);
15005 :
15006 2252 : while (HeapTupleIsValid(depTup = systable_getnext(scan)))
15007 : {
15008 1162 : Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(depTup);
15009 : ObjectAddress foundObject;
15010 :
15011 1162 : foundObject.classId = foundDep->classid;
15012 1162 : foundObject.objectId = foundDep->objid;
15013 1162 : foundObject.objectSubId = foundDep->objsubid;
15014 :
15015 1162 : switch (foundObject.classId)
15016 : {
15017 274 : case RelationRelationId:
15018 : {
15019 274 : char relKind = get_rel_relkind(foundObject.objectId);
15020 :
15021 274 : if (relKind == RELKIND_INDEX ||
15022 : relKind == RELKIND_PARTITIONED_INDEX)
15023 : {
15024 : Assert(foundObject.objectSubId == 0);
15025 236 : RememberIndexForRebuilding(foundObject.objectId, tab);
15026 : }
15027 38 : else if (relKind == RELKIND_SEQUENCE)
15028 : {
15029 : /*
15030 : * This must be a SERIAL column's sequence. We need
15031 : * not do anything to it.
15032 : */
15033 : Assert(foundObject.objectSubId == 0);
15034 : }
15035 : else
15036 : {
15037 : /* Not expecting any other direct dependencies... */
15038 0 : elog(ERROR, "unexpected object depending on column: %s",
15039 : getObjectDescription(&foundObject, false));
15040 : }
15041 274 : break;
15042 : }
15043 :
15044 674 : case ConstraintRelationId:
15045 : Assert(foundObject.objectSubId == 0);
15046 674 : RememberConstraintForRebuilding(foundObject.objectId, tab);
15047 674 : break;
15048 :
15049 0 : case ProcedureRelationId:
15050 :
15051 : /*
15052 : * A new-style SQL function can depend on a column, if that
15053 : * column is referenced in the parsed function body. Ideally
15054 : * we'd automatically update the function by deparsing and
15055 : * reparsing it, but that's risky and might well fail anyhow.
15056 : * FIXME someday.
15057 : *
15058 : * This is only a problem for AT_AlterColumnType, not
15059 : * AT_SetExpression.
15060 : */
15061 0 : if (subtype == AT_AlterColumnType)
15062 0 : ereport(ERROR,
15063 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15064 : errmsg("cannot alter type of a column used by a function or procedure"),
15065 : errdetail("%s depends on column \"%s\"",
15066 : getObjectDescription(&foundObject, false),
15067 : colName)));
15068 0 : break;
15069 :
15070 12 : case RewriteRelationId:
15071 :
15072 : /*
15073 : * View/rule bodies have pretty much the same issues as
15074 : * function bodies. FIXME someday.
15075 : */
15076 12 : if (subtype == AT_AlterColumnType)
15077 12 : ereport(ERROR,
15078 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15079 : errmsg("cannot alter type of a column used by a view or rule"),
15080 : errdetail("%s depends on column \"%s\"",
15081 : getObjectDescription(&foundObject, false),
15082 : colName)));
15083 0 : break;
15084 :
15085 0 : case TriggerRelationId:
15086 :
15087 : /*
15088 : * A trigger can depend on a column because the column is
15089 : * specified as an update target, or because the column is
15090 : * used in the trigger's WHEN condition. The first case would
15091 : * not require any extra work, but the second case would
15092 : * require updating the WHEN expression, which has the same
15093 : * issues as above. Since we can't easily tell which case
15094 : * applies, we punt for both. FIXME someday.
15095 : */
15096 0 : if (subtype == AT_AlterColumnType)
15097 0 : ereport(ERROR,
15098 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15099 : errmsg("cannot alter type of a column used in a trigger definition"),
15100 : errdetail("%s depends on column \"%s\"",
15101 : getObjectDescription(&foundObject, false),
15102 : colName)));
15103 0 : break;
15104 :
15105 0 : case PolicyRelationId:
15106 :
15107 : /*
15108 : * A policy can depend on a column because the column is
15109 : * specified in the policy's USING or WITH CHECK qual
15110 : * expressions. It might be possible to rewrite and recheck
15111 : * the policy expression, but punt for now. It's certainly
15112 : * easy enough to remove and recreate the policy; still, FIXME
15113 : * someday.
15114 : */
15115 0 : if (subtype == AT_AlterColumnType)
15116 0 : ereport(ERROR,
15117 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15118 : errmsg("cannot alter type of a column used in a policy definition"),
15119 : errdetail("%s depends on column \"%s\"",
15120 : getObjectDescription(&foundObject, false),
15121 : colName)));
15122 0 : break;
15123 :
15124 188 : case AttrDefaultRelationId:
15125 : {
15126 188 : ObjectAddress col = GetAttrDefaultColumnAddress(foundObject.objectId);
15127 :
15128 188 : if (col.objectId == RelationGetRelid(rel) &&
15129 188 : col.objectSubId == attnum)
15130 : {
15131 : /*
15132 : * Ignore the column's own default expression. The
15133 : * caller deals with it.
15134 : */
15135 : }
15136 : else
15137 : {
15138 : /*
15139 : * This must be a reference from the expression of a
15140 : * generated column elsewhere in the same table.
15141 : * Changing the type/generated expression of a column
15142 : * that is used by a generated column is not allowed
15143 : * by SQL standard, so just punt for now. It might be
15144 : * doable with some thinking and effort.
15145 : */
15146 24 : if (subtype == AT_AlterColumnType)
15147 24 : ereport(ERROR,
15148 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15149 : errmsg("cannot alter type of a column used by a generated column"),
15150 : errdetail("Column \"%s\" is used by generated column \"%s\".",
15151 : colName,
15152 : get_attname(col.objectId,
15153 : col.objectSubId,
15154 : false))));
15155 : }
15156 164 : break;
15157 : }
15158 :
15159 14 : case StatisticExtRelationId:
15160 :
15161 : /*
15162 : * Give the extended-stats machinery a chance to fix anything
15163 : * that this column type change would break.
15164 : */
15165 14 : RememberStatisticsForRebuilding(foundObject.objectId, tab);
15166 14 : break;
15167 :
15168 0 : case PublicationRelRelationId:
15169 :
15170 : /*
15171 : * Column reference in a PUBLICATION ... FOR TABLE ... WHERE
15172 : * clause. Same issues as above. FIXME someday.
15173 : */
15174 0 : if (subtype == AT_AlterColumnType)
15175 0 : ereport(ERROR,
15176 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15177 : errmsg("cannot alter type of a column used by a publication WHERE clause"),
15178 : errdetail("%s depends on column \"%s\"",
15179 : getObjectDescription(&foundObject, false),
15180 : colName)));
15181 0 : break;
15182 :
15183 0 : default:
15184 :
15185 : /*
15186 : * We don't expect any other sorts of objects to depend on a
15187 : * column.
15188 : */
15189 0 : elog(ERROR, "unexpected object depending on column: %s",
15190 : getObjectDescription(&foundObject, false));
15191 : break;
15192 : }
15193 : }
15194 :
15195 1090 : systable_endscan(scan);
15196 1090 : table_close(depRel, NoLock);
15197 1090 : }
15198 :
15199 : /*
15200 : * Subroutine for ATExecAlterColumnType: remember that a replica identity
15201 : * needs to be reset.
15202 : */
15203 : static void
15204 444 : RememberReplicaIdentityForRebuilding(Oid indoid, AlteredTableInfo *tab)
15205 : {
15206 444 : if (!get_index_isreplident(indoid))
15207 426 : return;
15208 :
15209 18 : if (tab->replicaIdentityIndex)
15210 0 : elog(ERROR, "relation %u has multiple indexes marked as replica identity", tab->relid);
15211 :
15212 18 : tab->replicaIdentityIndex = get_rel_name(indoid);
15213 : }
15214 :
15215 : /*
15216 : * Subroutine for ATExecAlterColumnType: remember any clustered index.
15217 : */
15218 : static void
15219 444 : RememberClusterOnForRebuilding(Oid indoid, AlteredTableInfo *tab)
15220 : {
15221 444 : if (!get_index_isclustered(indoid))
15222 426 : return;
15223 :
15224 18 : if (tab->clusterOnIndex)
15225 0 : elog(ERROR, "relation %u has multiple clustered indexes", tab->relid);
15226 :
15227 18 : tab->clusterOnIndex = get_rel_name(indoid);
15228 : }
15229 :
15230 : /*
15231 : * Subroutine for ATExecAlterColumnType: remember that a constraint needs
15232 : * to be rebuilt (which we might already know).
15233 : */
15234 : static void
15235 686 : RememberConstraintForRebuilding(Oid conoid, AlteredTableInfo *tab)
15236 : {
15237 : /*
15238 : * This de-duplication check is critical for two independent reasons: we
15239 : * mustn't try to recreate the same constraint twice, and if a constraint
15240 : * depends on more than one column whose type is to be altered, we must
15241 : * capture its definition string before applying any of the column type
15242 : * changes. ruleutils.c will get confused if we ask again later.
15243 : */
15244 686 : if (!list_member_oid(tab->changedConstraintOids, conoid))
15245 : {
15246 : /* OK, capture the constraint's existing definition string */
15247 596 : char *defstring = pg_get_constraintdef_command(conoid);
15248 : Oid indoid;
15249 :
15250 : /*
15251 : * It is critical to create not-null constraints ahead of primary key
15252 : * indexes; otherwise, the not-null constraint would be created by the
15253 : * primary key, and the constraint name would be wrong.
15254 : */
15255 596 : if (get_constraint_type(conoid) == CONSTRAINT_NOTNULL)
15256 : {
15257 198 : tab->changedConstraintOids = lcons_oid(conoid,
15258 : tab->changedConstraintOids);
15259 198 : tab->changedConstraintDefs = lcons(defstring,
15260 : tab->changedConstraintDefs);
15261 : }
15262 : else
15263 : {
15264 :
15265 398 : tab->changedConstraintOids = lappend_oid(tab->changedConstraintOids,
15266 : conoid);
15267 398 : tab->changedConstraintDefs = lappend(tab->changedConstraintDefs,
15268 : defstring);
15269 : }
15270 :
15271 : /*
15272 : * For the index of a constraint, if any, remember if it is used for
15273 : * the table's replica identity or if it is a clustered index, so that
15274 : * ATPostAlterTypeCleanup() can queue up commands necessary to restore
15275 : * those properties.
15276 : */
15277 596 : indoid = get_constraint_index(conoid);
15278 596 : if (OidIsValid(indoid))
15279 : {
15280 228 : RememberReplicaIdentityForRebuilding(indoid, tab);
15281 228 : RememberClusterOnForRebuilding(indoid, tab);
15282 : }
15283 : }
15284 686 : }
15285 :
15286 : /*
15287 : * Subroutine for ATExecAlterColumnType: remember that an index needs
15288 : * to be rebuilt (which we might already know).
15289 : */
15290 : static void
15291 236 : RememberIndexForRebuilding(Oid indoid, AlteredTableInfo *tab)
15292 : {
15293 : /*
15294 : * This de-duplication check is critical for two independent reasons: we
15295 : * mustn't try to recreate the same index twice, and if an index depends
15296 : * on more than one column whose type is to be altered, we must capture
15297 : * its definition string before applying any of the column type changes.
15298 : * ruleutils.c will get confused if we ask again later.
15299 : */
15300 236 : if (!list_member_oid(tab->changedIndexOids, indoid))
15301 : {
15302 : /*
15303 : * Before adding it as an index-to-rebuild, we'd better see if it
15304 : * belongs to a constraint, and if so rebuild the constraint instead.
15305 : * Typically this check fails, because constraint indexes normally
15306 : * have only dependencies on their constraint. But it's possible for
15307 : * such an index to also have direct dependencies on table columns,
15308 : * for example with a partial exclusion constraint.
15309 : */
15310 228 : Oid conoid = get_index_constraint(indoid);
15311 :
15312 228 : if (OidIsValid(conoid))
15313 : {
15314 12 : RememberConstraintForRebuilding(conoid, tab);
15315 : }
15316 : else
15317 : {
15318 : /* OK, capture the index's existing definition string */
15319 216 : char *defstring = pg_get_indexdef_string(indoid);
15320 :
15321 216 : tab->changedIndexOids = lappend_oid(tab->changedIndexOids,
15322 : indoid);
15323 216 : tab->changedIndexDefs = lappend(tab->changedIndexDefs,
15324 : defstring);
15325 :
15326 : /*
15327 : * Remember if this index is used for the table's replica identity
15328 : * or if it is a clustered index, so that ATPostAlterTypeCleanup()
15329 : * can queue up commands necessary to restore those properties.
15330 : */
15331 216 : RememberReplicaIdentityForRebuilding(indoid, tab);
15332 216 : RememberClusterOnForRebuilding(indoid, tab);
15333 : }
15334 : }
15335 236 : }
15336 :
15337 : /*
15338 : * Subroutine for ATExecAlterColumnType: remember that a statistics object
15339 : * needs to be rebuilt (which we might already know).
15340 : */
15341 : static void
15342 14 : RememberStatisticsForRebuilding(Oid stxoid, AlteredTableInfo *tab)
15343 : {
15344 : /*
15345 : * This de-duplication check is critical for two independent reasons: we
15346 : * mustn't try to recreate the same statistics object twice, and if the
15347 : * statistics object depends on more than one column whose type is to be
15348 : * altered, we must capture its definition string before applying any of
15349 : * the type changes. ruleutils.c will get confused if we ask again later.
15350 : */
15351 14 : if (!list_member_oid(tab->changedStatisticsOids, stxoid))
15352 : {
15353 : /* OK, capture the statistics object's existing definition string */
15354 14 : char *defstring = pg_get_statisticsobjdef_string(stxoid);
15355 :
15356 14 : tab->changedStatisticsOids = lappend_oid(tab->changedStatisticsOids,
15357 : stxoid);
15358 14 : tab->changedStatisticsDefs = lappend(tab->changedStatisticsDefs,
15359 : defstring);
15360 : }
15361 14 : }
15362 :
15363 : /*
15364 : * Cleanup after we've finished all the ALTER TYPE or SET EXPRESSION
15365 : * operations for a particular relation. We have to drop and recreate all the
15366 : * indexes and constraints that depend on the altered columns. We do the
15367 : * actual dropping here, but re-creation is managed by adding work queue
15368 : * entries to do those steps later.
15369 : */
15370 : static void
15371 1120 : ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode)
15372 : {
15373 : ObjectAddress obj;
15374 : ObjectAddresses *objects;
15375 : ListCell *def_item;
15376 : ListCell *oid_item;
15377 :
15378 : /*
15379 : * Collect all the constraints and indexes to drop so we can process them
15380 : * in a single call. That way we don't have to worry about dependencies
15381 : * among them.
15382 : */
15383 1120 : objects = new_object_addresses();
15384 :
15385 : /*
15386 : * Re-parse the index and constraint definitions, and attach them to the
15387 : * appropriate work queue entries. We do this before dropping because in
15388 : * the case of a FOREIGN KEY constraint, we might not yet have exclusive
15389 : * lock on the table the constraint is attached to, and we need to get
15390 : * that before reparsing/dropping.
15391 : *
15392 : * We can't rely on the output of deparsing to tell us which relation to
15393 : * operate on, because concurrent activity might have made the name
15394 : * resolve differently. Instead, we've got to use the OID of the
15395 : * constraint or index we're processing to figure out which relation to
15396 : * operate on.
15397 : */
15398 1716 : forboth(oid_item, tab->changedConstraintOids,
15399 : def_item, tab->changedConstraintDefs)
15400 : {
15401 596 : Oid oldId = lfirst_oid(oid_item);
15402 : HeapTuple tup;
15403 : Form_pg_constraint con;
15404 : Oid relid;
15405 : Oid confrelid;
15406 : char contype;
15407 : bool conislocal;
15408 :
15409 596 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15410 596 : if (!HeapTupleIsValid(tup)) /* should not happen */
15411 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15412 596 : con = (Form_pg_constraint) GETSTRUCT(tup);
15413 596 : if (OidIsValid(con->conrelid))
15414 582 : relid = con->conrelid;
15415 : else
15416 : {
15417 : /* must be a domain constraint */
15418 14 : relid = get_typ_typrelid(getBaseType(con->contypid));
15419 14 : if (!OidIsValid(relid))
15420 0 : elog(ERROR, "could not identify relation associated with constraint %u", oldId);
15421 : }
15422 596 : confrelid = con->confrelid;
15423 596 : contype = con->contype;
15424 596 : conislocal = con->conislocal;
15425 596 : ReleaseSysCache(tup);
15426 :
15427 596 : ObjectAddressSet(obj, ConstraintRelationId, oldId);
15428 596 : add_exact_object_address(&obj, objects);
15429 :
15430 : /*
15431 : * If the constraint is inherited (only), we don't want to inject a
15432 : * new definition here; it'll get recreated when
15433 : * ATAddCheckNNConstraint recurses from adding the parent table's
15434 : * constraint. But we had to carry the info this far so that we can
15435 : * drop the constraint below.
15436 : */
15437 596 : if (!conislocal)
15438 28 : continue;
15439 :
15440 : /*
15441 : * When rebuilding an FK constraint that references the table we're
15442 : * modifying, we might not yet have any lock on the FK's table, so get
15443 : * one now. We'll need AccessExclusiveLock for the DROP CONSTRAINT
15444 : * step, so there's no value in asking for anything weaker.
15445 : */
15446 568 : if (relid != tab->relid && contype == CONSTRAINT_FOREIGN)
15447 36 : LockRelationOid(relid, AccessExclusiveLock);
15448 :
15449 568 : ATPostAlterTypeParse(oldId, relid, confrelid,
15450 568 : (char *) lfirst(def_item),
15451 568 : wqueue, lockmode, tab->rewrite);
15452 : }
15453 1336 : forboth(oid_item, tab->changedIndexOids,
15454 : def_item, tab->changedIndexDefs)
15455 : {
15456 216 : Oid oldId = lfirst_oid(oid_item);
15457 : Oid relid;
15458 :
15459 216 : relid = IndexGetRelation(oldId, false);
15460 216 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15461 216 : (char *) lfirst(def_item),
15462 216 : wqueue, lockmode, tab->rewrite);
15463 :
15464 216 : ObjectAddressSet(obj, RelationRelationId, oldId);
15465 216 : add_exact_object_address(&obj, objects);
15466 : }
15467 :
15468 : /* add dependencies for new statistics */
15469 1134 : forboth(oid_item, tab->changedStatisticsOids,
15470 : def_item, tab->changedStatisticsDefs)
15471 : {
15472 14 : Oid oldId = lfirst_oid(oid_item);
15473 : Oid relid;
15474 :
15475 14 : relid = StatisticsGetRelation(oldId, false);
15476 14 : ATPostAlterTypeParse(oldId, relid, InvalidOid,
15477 14 : (char *) lfirst(def_item),
15478 14 : wqueue, lockmode, tab->rewrite);
15479 :
15480 14 : ObjectAddressSet(obj, StatisticExtRelationId, oldId);
15481 14 : add_exact_object_address(&obj, objects);
15482 : }
15483 :
15484 : /*
15485 : * Queue up command to restore replica identity index marking
15486 : */
15487 1120 : if (tab->replicaIdentityIndex)
15488 : {
15489 18 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15490 18 : ReplicaIdentityStmt *subcmd = makeNode(ReplicaIdentityStmt);
15491 :
15492 18 : subcmd->identity_type = REPLICA_IDENTITY_INDEX;
15493 18 : subcmd->name = tab->replicaIdentityIndex;
15494 18 : cmd->subtype = AT_ReplicaIdentity;
15495 18 : cmd->def = (Node *) subcmd;
15496 :
15497 : /* do it after indexes and constraints */
15498 18 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15499 18 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15500 : }
15501 :
15502 : /*
15503 : * Queue up command to restore marking of index used for cluster.
15504 : */
15505 1120 : if (tab->clusterOnIndex)
15506 : {
15507 18 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15508 :
15509 18 : cmd->subtype = AT_ClusterOn;
15510 18 : cmd->name = tab->clusterOnIndex;
15511 :
15512 : /* do it after indexes and constraints */
15513 18 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15514 18 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15515 : }
15516 :
15517 : /*
15518 : * It should be okay to use DROP_RESTRICT here, since nothing else should
15519 : * be depending on these objects.
15520 : */
15521 1120 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
15522 :
15523 1120 : free_object_addresses(objects);
15524 :
15525 : /*
15526 : * The objects will get recreated during subsequent passes over the work
15527 : * queue.
15528 : */
15529 1120 : }
15530 :
15531 : /*
15532 : * Parse the previously-saved definition string for a constraint, index or
15533 : * statistics object against the newly-established column data type(s), and
15534 : * queue up the resulting command parsetrees for execution.
15535 : *
15536 : * This might fail if, for example, you have a WHERE clause that uses an
15537 : * operator that's not available for the new column type.
15538 : */
15539 : static void
15540 798 : ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
15541 : List **wqueue, LOCKMODE lockmode, bool rewrite)
15542 : {
15543 : List *raw_parsetree_list;
15544 : List *querytree_list;
15545 : ListCell *list_item;
15546 : Relation rel;
15547 :
15548 : /*
15549 : * We expect that we will get only ALTER TABLE and CREATE INDEX
15550 : * statements. Hence, there is no need to pass them through
15551 : * parse_analyze_*() or the rewriter, but instead we need to pass them
15552 : * through parse_utilcmd.c to make them ready for execution.
15553 : */
15554 798 : raw_parsetree_list = raw_parser(cmd, RAW_PARSE_DEFAULT);
15555 798 : querytree_list = NIL;
15556 1596 : foreach(list_item, raw_parsetree_list)
15557 : {
15558 798 : RawStmt *rs = lfirst_node(RawStmt, list_item);
15559 798 : Node *stmt = rs->stmt;
15560 :
15561 798 : if (IsA(stmt, IndexStmt))
15562 216 : querytree_list = lappend(querytree_list,
15563 216 : transformIndexStmt(oldRelId,
15564 : (IndexStmt *) stmt,
15565 : cmd));
15566 582 : else if (IsA(stmt, AlterTableStmt))
15567 : {
15568 : List *beforeStmts;
15569 : List *afterStmts;
15570 :
15571 554 : stmt = (Node *) transformAlterTableStmt(oldRelId,
15572 : (AlterTableStmt *) stmt,
15573 : cmd,
15574 : &beforeStmts,
15575 : &afterStmts);
15576 554 : querytree_list = list_concat(querytree_list, beforeStmts);
15577 554 : querytree_list = lappend(querytree_list, stmt);
15578 554 : querytree_list = list_concat(querytree_list, afterStmts);
15579 : }
15580 28 : else if (IsA(stmt, CreateStatsStmt))
15581 14 : querytree_list = lappend(querytree_list,
15582 14 : transformStatsStmt(oldRelId,
15583 : (CreateStatsStmt *) stmt,
15584 : cmd));
15585 : else
15586 14 : querytree_list = lappend(querytree_list, stmt);
15587 : }
15588 :
15589 : /* Caller should already have acquired whatever lock we need. */
15590 798 : rel = relation_open(oldRelId, NoLock);
15591 :
15592 : /*
15593 : * Attach each generated command to the proper place in the work queue.
15594 : * Note this could result in creation of entirely new work-queue entries.
15595 : *
15596 : * Also note that we have to tweak the command subtypes, because it turns
15597 : * out that re-creation of indexes and constraints has to act a bit
15598 : * differently from initial creation.
15599 : */
15600 1596 : foreach(list_item, querytree_list)
15601 : {
15602 798 : Node *stm = (Node *) lfirst(list_item);
15603 : AlteredTableInfo *tab;
15604 :
15605 798 : tab = ATGetQueueEntry(wqueue, rel);
15606 :
15607 798 : if (IsA(stm, IndexStmt))
15608 : {
15609 216 : IndexStmt *stmt = (IndexStmt *) stm;
15610 : AlterTableCmd *newcmd;
15611 :
15612 216 : if (!rewrite)
15613 56 : TryReuseIndex(oldId, stmt);
15614 216 : stmt->reset_default_tblspc = true;
15615 : /* keep the index's comment */
15616 216 : stmt->idxcomment = GetComment(oldId, RelationRelationId, 0);
15617 :
15618 216 : newcmd = makeNode(AlterTableCmd);
15619 216 : newcmd->subtype = AT_ReAddIndex;
15620 216 : newcmd->def = (Node *) stmt;
15621 216 : tab->subcmds[AT_PASS_OLD_INDEX] =
15622 216 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], newcmd);
15623 : }
15624 582 : else if (IsA(stm, AlterTableStmt))
15625 : {
15626 554 : AlterTableStmt *stmt = (AlterTableStmt *) stm;
15627 : ListCell *lcmd;
15628 :
15629 1108 : foreach(lcmd, stmt->cmds)
15630 : {
15631 554 : AlterTableCmd *cmd = lfirst_node(AlterTableCmd, lcmd);
15632 :
15633 554 : if (cmd->subtype == AT_AddIndex)
15634 : {
15635 : IndexStmt *indstmt;
15636 : Oid indoid;
15637 :
15638 228 : indstmt = castNode(IndexStmt, cmd->def);
15639 228 : indoid = get_constraint_index(oldId);
15640 :
15641 228 : if (!rewrite)
15642 48 : TryReuseIndex(indoid, indstmt);
15643 : /* keep any comment on the index */
15644 228 : indstmt->idxcomment = GetComment(indoid,
15645 : RelationRelationId, 0);
15646 228 : indstmt->reset_default_tblspc = true;
15647 :
15648 228 : cmd->subtype = AT_ReAddIndex;
15649 228 : tab->subcmds[AT_PASS_OLD_INDEX] =
15650 228 : lappend(tab->subcmds[AT_PASS_OLD_INDEX], cmd);
15651 :
15652 : /* recreate any comment on the constraint */
15653 228 : RebuildConstraintComment(tab,
15654 : AT_PASS_OLD_INDEX,
15655 : oldId,
15656 : rel,
15657 : NIL,
15658 228 : indstmt->idxname);
15659 : }
15660 326 : else if (cmd->subtype == AT_AddConstraint)
15661 : {
15662 326 : Constraint *con = castNode(Constraint, cmd->def);
15663 :
15664 326 : con->old_pktable_oid = refRelId;
15665 : /* rewriting neither side of a FK */
15666 326 : if (con->contype == CONSTR_FOREIGN &&
15667 72 : !rewrite && tab->rewrite == 0)
15668 6 : TryReuseForeignKey(oldId, con);
15669 326 : con->reset_default_tblspc = true;
15670 326 : cmd->subtype = AT_ReAddConstraint;
15671 326 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15672 326 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15673 :
15674 : /*
15675 : * Recreate any comment on the constraint. If we have
15676 : * recreated a primary key, then transformTableConstraint
15677 : * has added an unnamed not-null constraint here; skip
15678 : * this in that case.
15679 : */
15680 326 : if (con->conname)
15681 326 : RebuildConstraintComment(tab,
15682 : AT_PASS_OLD_CONSTR,
15683 : oldId,
15684 : rel,
15685 : NIL,
15686 326 : con->conname);
15687 : else
15688 : Assert(con->contype == CONSTR_NOTNULL);
15689 : }
15690 : else
15691 0 : elog(ERROR, "unexpected statement subtype: %d",
15692 : (int) cmd->subtype);
15693 : }
15694 : }
15695 28 : else if (IsA(stm, AlterDomainStmt))
15696 : {
15697 14 : AlterDomainStmt *stmt = (AlterDomainStmt *) stm;
15698 :
15699 14 : if (stmt->subtype == 'C') /* ADD CONSTRAINT */
15700 : {
15701 14 : Constraint *con = castNode(Constraint, stmt->def);
15702 14 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
15703 :
15704 14 : cmd->subtype = AT_ReAddDomainConstraint;
15705 14 : cmd->def = (Node *) stmt;
15706 14 : tab->subcmds[AT_PASS_OLD_CONSTR] =
15707 14 : lappend(tab->subcmds[AT_PASS_OLD_CONSTR], cmd);
15708 :
15709 : /* recreate any comment on the constraint */
15710 14 : RebuildConstraintComment(tab,
15711 : AT_PASS_OLD_CONSTR,
15712 : oldId,
15713 : NULL,
15714 : stmt->typeName,
15715 14 : con->conname);
15716 : }
15717 : else
15718 0 : elog(ERROR, "unexpected statement subtype: %d",
15719 : (int) stmt->subtype);
15720 : }
15721 14 : else if (IsA(stm, CreateStatsStmt))
15722 : {
15723 14 : CreateStatsStmt *stmt = (CreateStatsStmt *) stm;
15724 : AlterTableCmd *newcmd;
15725 :
15726 : /* keep the statistics object's comment */
15727 14 : stmt->stxcomment = GetComment(oldId, StatisticExtRelationId, 0);
15728 :
15729 14 : newcmd = makeNode(AlterTableCmd);
15730 14 : newcmd->subtype = AT_ReAddStatistics;
15731 14 : newcmd->def = (Node *) stmt;
15732 14 : tab->subcmds[AT_PASS_MISC] =
15733 14 : lappend(tab->subcmds[AT_PASS_MISC], newcmd);
15734 : }
15735 : else
15736 0 : elog(ERROR, "unexpected statement type: %d",
15737 : (int) nodeTag(stm));
15738 : }
15739 :
15740 798 : relation_close(rel, NoLock);
15741 798 : }
15742 :
15743 : /*
15744 : * Subroutine for ATPostAlterTypeParse() to recreate any existing comment
15745 : * for a table or domain constraint that is being rebuilt.
15746 : *
15747 : * objid is the OID of the constraint.
15748 : * Pass "rel" for a table constraint, or "domname" (domain's qualified name
15749 : * as a string list) for a domain constraint.
15750 : * (We could dig that info, as well as the conname, out of the pg_constraint
15751 : * entry; but callers already have them so might as well pass them.)
15752 : */
15753 : static void
15754 568 : RebuildConstraintComment(AlteredTableInfo *tab, AlterTablePass pass, Oid objid,
15755 : Relation rel, List *domname,
15756 : const char *conname)
15757 : {
15758 : CommentStmt *cmd;
15759 : char *comment_str;
15760 : AlterTableCmd *newcmd;
15761 :
15762 : /* Look for comment for object wanted, and leave if none */
15763 568 : comment_str = GetComment(objid, ConstraintRelationId, 0);
15764 568 : if (comment_str == NULL)
15765 478 : return;
15766 :
15767 : /* Build CommentStmt node, copying all input data for safety */
15768 90 : cmd = makeNode(CommentStmt);
15769 90 : if (rel)
15770 : {
15771 78 : cmd->objtype = OBJECT_TABCONSTRAINT;
15772 78 : cmd->object = (Node *)
15773 78 : list_make3(makeString(get_namespace_name(RelationGetNamespace(rel))),
15774 : makeString(pstrdup(RelationGetRelationName(rel))),
15775 : makeString(pstrdup(conname)));
15776 : }
15777 : else
15778 : {
15779 12 : cmd->objtype = OBJECT_DOMCONSTRAINT;
15780 12 : cmd->object = (Node *)
15781 12 : list_make2(makeTypeNameFromNameList(copyObject(domname)),
15782 : makeString(pstrdup(conname)));
15783 : }
15784 90 : cmd->comment = comment_str;
15785 :
15786 : /* Append it to list of commands */
15787 90 : newcmd = makeNode(AlterTableCmd);
15788 90 : newcmd->subtype = AT_ReAddComment;
15789 90 : newcmd->def = (Node *) cmd;
15790 90 : tab->subcmds[pass] = lappend(tab->subcmds[pass], newcmd);
15791 : }
15792 :
15793 : /*
15794 : * Subroutine for ATPostAlterTypeParse(). Calls out to CheckIndexCompatible()
15795 : * for the real analysis, then mutates the IndexStmt based on that verdict.
15796 : */
15797 : static void
15798 104 : TryReuseIndex(Oid oldId, IndexStmt *stmt)
15799 : {
15800 104 : if (CheckIndexCompatible(oldId,
15801 104 : stmt->accessMethod,
15802 104 : stmt->indexParams,
15803 104 : stmt->excludeOpNames,
15804 104 : stmt->iswithoutoverlaps))
15805 : {
15806 104 : Relation irel = index_open(oldId, NoLock);
15807 :
15808 : /* If it's a partitioned index, there is no storage to share. */
15809 104 : if (irel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
15810 : {
15811 74 : stmt->oldNumber = irel->rd_locator.relNumber;
15812 74 : stmt->oldCreateSubid = irel->rd_createSubid;
15813 74 : stmt->oldFirstRelfilelocatorSubid = irel->rd_firstRelfilelocatorSubid;
15814 : }
15815 104 : index_close(irel, NoLock);
15816 : }
15817 104 : }
15818 :
15819 : /*
15820 : * Subroutine for ATPostAlterTypeParse().
15821 : *
15822 : * Stash the old P-F equality operator into the Constraint node, for possible
15823 : * use by ATAddForeignKeyConstraint() in determining whether revalidation of
15824 : * this constraint can be skipped.
15825 : */
15826 : static void
15827 6 : TryReuseForeignKey(Oid oldId, Constraint *con)
15828 : {
15829 : HeapTuple tup;
15830 : Datum adatum;
15831 : ArrayType *arr;
15832 : Oid *rawarr;
15833 : int numkeys;
15834 : int i;
15835 :
15836 : Assert(con->contype == CONSTR_FOREIGN);
15837 : Assert(con->old_conpfeqop == NIL); /* already prepared this node */
15838 :
15839 6 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(oldId));
15840 6 : if (!HeapTupleIsValid(tup)) /* should not happen */
15841 0 : elog(ERROR, "cache lookup failed for constraint %u", oldId);
15842 :
15843 6 : adatum = SysCacheGetAttrNotNull(CONSTROID, tup,
15844 : Anum_pg_constraint_conpfeqop);
15845 6 : arr = DatumGetArrayTypeP(adatum); /* ensure not toasted */
15846 6 : numkeys = ARR_DIMS(arr)[0];
15847 : /* test follows the one in ri_FetchConstraintInfo() */
15848 6 : if (ARR_NDIM(arr) != 1 ||
15849 6 : ARR_HASNULL(arr) ||
15850 6 : ARR_ELEMTYPE(arr) != OIDOID)
15851 0 : elog(ERROR, "conpfeqop is not a 1-D Oid array");
15852 6 : rawarr = (Oid *) ARR_DATA_PTR(arr);
15853 :
15854 : /* stash a List of the operator Oids in our Constraint node */
15855 12 : for (i = 0; i < numkeys; i++)
15856 6 : con->old_conpfeqop = lappend_oid(con->old_conpfeqop, rawarr[i]);
15857 :
15858 6 : ReleaseSysCache(tup);
15859 6 : }
15860 :
15861 : /*
15862 : * ALTER COLUMN .. OPTIONS ( ... )
15863 : *
15864 : * Returns the address of the modified column
15865 : */
15866 : static ObjectAddress
15867 172 : ATExecAlterColumnGenericOptions(Relation rel,
15868 : const char *colName,
15869 : List *options,
15870 : LOCKMODE lockmode)
15871 : {
15872 : Relation ftrel;
15873 : Relation attrel;
15874 : ForeignServer *server;
15875 : ForeignDataWrapper *fdw;
15876 : HeapTuple tuple;
15877 : HeapTuple newtuple;
15878 : bool isnull;
15879 : Datum repl_val[Natts_pg_attribute];
15880 : bool repl_null[Natts_pg_attribute];
15881 : bool repl_repl[Natts_pg_attribute];
15882 : Datum datum;
15883 : Form_pg_foreign_table fttableform;
15884 : Form_pg_attribute atttableform;
15885 : AttrNumber attnum;
15886 : ObjectAddress address;
15887 :
15888 172 : if (options == NIL)
15889 0 : return InvalidObjectAddress;
15890 :
15891 : /* First, determine FDW validator associated to the foreign table. */
15892 172 : ftrel = table_open(ForeignTableRelationId, AccessShareLock);
15893 172 : tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(rel->rd_id));
15894 172 : if (!HeapTupleIsValid(tuple))
15895 0 : ereport(ERROR,
15896 : (errcode(ERRCODE_UNDEFINED_OBJECT),
15897 : errmsg("foreign table \"%s\" does not exist",
15898 : RelationGetRelationName(rel))));
15899 172 : fttableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
15900 172 : server = GetForeignServer(fttableform->ftserver);
15901 172 : fdw = GetForeignDataWrapper(server->fdwid);
15902 :
15903 172 : table_close(ftrel, AccessShareLock);
15904 172 : ReleaseSysCache(tuple);
15905 :
15906 172 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
15907 172 : tuple = SearchSysCacheAttName(RelationGetRelid(rel), colName);
15908 172 : if (!HeapTupleIsValid(tuple))
15909 0 : ereport(ERROR,
15910 : (errcode(ERRCODE_UNDEFINED_COLUMN),
15911 : errmsg("column \"%s\" of relation \"%s\" does not exist",
15912 : colName, RelationGetRelationName(rel))));
15913 :
15914 : /* Prevent them from altering a system attribute */
15915 172 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
15916 172 : attnum = atttableform->attnum;
15917 172 : if (attnum <= 0)
15918 6 : ereport(ERROR,
15919 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
15920 : errmsg("cannot alter system column \"%s\"", colName)));
15921 :
15922 :
15923 : /* Initialize buffers for new tuple values */
15924 166 : memset(repl_val, 0, sizeof(repl_val));
15925 166 : memset(repl_null, false, sizeof(repl_null));
15926 166 : memset(repl_repl, false, sizeof(repl_repl));
15927 :
15928 : /* Extract the current options */
15929 166 : datum = SysCacheGetAttr(ATTNAME,
15930 : tuple,
15931 : Anum_pg_attribute_attfdwoptions,
15932 : &isnull);
15933 166 : if (isnull)
15934 156 : datum = PointerGetDatum(NULL);
15935 :
15936 : /* Transform the options */
15937 166 : datum = transformGenericOptions(AttributeRelationId,
15938 : datum,
15939 : options,
15940 : fdw->fdwvalidator);
15941 :
15942 166 : if (PointerIsValid(DatumGetPointer(datum)))
15943 166 : repl_val[Anum_pg_attribute_attfdwoptions - 1] = datum;
15944 : else
15945 0 : repl_null[Anum_pg_attribute_attfdwoptions - 1] = true;
15946 :
15947 166 : repl_repl[Anum_pg_attribute_attfdwoptions - 1] = true;
15948 :
15949 : /* Everything looks good - update the tuple */
15950 :
15951 166 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(attrel),
15952 : repl_val, repl_null, repl_repl);
15953 :
15954 166 : CatalogTupleUpdate(attrel, &newtuple->t_self, newtuple);
15955 :
15956 166 : InvokeObjectPostAlterHook(RelationRelationId,
15957 : RelationGetRelid(rel),
15958 : atttableform->attnum);
15959 166 : ObjectAddressSubSet(address, RelationRelationId,
15960 : RelationGetRelid(rel), attnum);
15961 :
15962 166 : ReleaseSysCache(tuple);
15963 :
15964 166 : table_close(attrel, RowExclusiveLock);
15965 :
15966 166 : heap_freetuple(newtuple);
15967 :
15968 166 : return address;
15969 : }
15970 :
15971 : /*
15972 : * ALTER TABLE OWNER
15973 : *
15974 : * recursing is true if we are recursing from a table to its indexes,
15975 : * sequences, or toast table. We don't allow the ownership of those things to
15976 : * be changed separately from the parent table. Also, we can skip permission
15977 : * checks (this is necessary not just an optimization, else we'd fail to
15978 : * handle toast tables properly).
15979 : *
15980 : * recursing is also true if ALTER TYPE OWNER is calling us to fix up a
15981 : * free-standing composite type.
15982 : */
15983 : void
15984 3800 : ATExecChangeOwner(Oid relationOid, Oid newOwnerId, bool recursing, LOCKMODE lockmode)
15985 : {
15986 : Relation target_rel;
15987 : Relation class_rel;
15988 : HeapTuple tuple;
15989 : Form_pg_class tuple_class;
15990 :
15991 : /*
15992 : * Get exclusive lock till end of transaction on the target table. Use
15993 : * relation_open so that we can work on indexes and sequences.
15994 : */
15995 3800 : target_rel = relation_open(relationOid, lockmode);
15996 :
15997 : /* Get its pg_class tuple, too */
15998 3800 : class_rel = table_open(RelationRelationId, RowExclusiveLock);
15999 :
16000 3800 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relationOid));
16001 3800 : if (!HeapTupleIsValid(tuple))
16002 0 : elog(ERROR, "cache lookup failed for relation %u", relationOid);
16003 3800 : tuple_class = (Form_pg_class) GETSTRUCT(tuple);
16004 :
16005 : /* Can we change the ownership of this tuple? */
16006 3800 : switch (tuple_class->relkind)
16007 : {
16008 3454 : case RELKIND_RELATION:
16009 : case RELKIND_VIEW:
16010 : case RELKIND_MATVIEW:
16011 : case RELKIND_FOREIGN_TABLE:
16012 : case RELKIND_PARTITIONED_TABLE:
16013 : /* ok to change owner */
16014 3454 : break;
16015 96 : case RELKIND_INDEX:
16016 96 : if (!recursing)
16017 : {
16018 : /*
16019 : * Because ALTER INDEX OWNER used to be allowed, and in fact
16020 : * is generated by old versions of pg_dump, we give a warning
16021 : * and do nothing rather than erroring out. Also, to avoid
16022 : * unnecessary chatter while restoring those old dumps, say
16023 : * nothing at all if the command would be a no-op anyway.
16024 : */
16025 0 : if (tuple_class->relowner != newOwnerId)
16026 0 : ereport(WARNING,
16027 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16028 : errmsg("cannot change owner of index \"%s\"",
16029 : NameStr(tuple_class->relname)),
16030 : errhint("Change the ownership of the index's table instead.")));
16031 : /* quick hack to exit via the no-op path */
16032 0 : newOwnerId = tuple_class->relowner;
16033 : }
16034 96 : break;
16035 20 : case RELKIND_PARTITIONED_INDEX:
16036 20 : if (recursing)
16037 20 : break;
16038 0 : ereport(ERROR,
16039 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16040 : errmsg("cannot change owner of index \"%s\"",
16041 : NameStr(tuple_class->relname)),
16042 : errhint("Change the ownership of the index's table instead.")));
16043 : break;
16044 180 : case RELKIND_SEQUENCE:
16045 180 : if (!recursing &&
16046 132 : tuple_class->relowner != newOwnerId)
16047 : {
16048 : /* if it's an owned sequence, disallow changing it by itself */
16049 : Oid tableId;
16050 : int32 colId;
16051 :
16052 0 : if (sequenceIsOwned(relationOid, DEPENDENCY_AUTO, &tableId, &colId) ||
16053 0 : sequenceIsOwned(relationOid, DEPENDENCY_INTERNAL, &tableId, &colId))
16054 0 : ereport(ERROR,
16055 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16056 : errmsg("cannot change owner of sequence \"%s\"",
16057 : NameStr(tuple_class->relname)),
16058 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
16059 : NameStr(tuple_class->relname),
16060 : get_rel_name(tableId))));
16061 : }
16062 180 : break;
16063 8 : case RELKIND_COMPOSITE_TYPE:
16064 8 : if (recursing)
16065 8 : break;
16066 0 : ereport(ERROR,
16067 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16068 : errmsg("\"%s\" is a composite type",
16069 : NameStr(tuple_class->relname)),
16070 : /* translator: %s is an SQL ALTER command */
16071 : errhint("Use %s instead.",
16072 : "ALTER TYPE")));
16073 : break;
16074 42 : case RELKIND_TOASTVALUE:
16075 42 : if (recursing)
16076 42 : break;
16077 : /* FALL THRU */
16078 : default:
16079 0 : ereport(ERROR,
16080 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16081 : errmsg("cannot change owner of relation \"%s\"",
16082 : NameStr(tuple_class->relname)),
16083 : errdetail_relkind_not_supported(tuple_class->relkind)));
16084 : }
16085 :
16086 : /*
16087 : * If the new owner is the same as the existing owner, consider the
16088 : * command to have succeeded. This is for dump restoration purposes.
16089 : */
16090 3800 : if (tuple_class->relowner != newOwnerId)
16091 : {
16092 : Datum repl_val[Natts_pg_class];
16093 : bool repl_null[Natts_pg_class];
16094 : bool repl_repl[Natts_pg_class];
16095 : Acl *newAcl;
16096 : Datum aclDatum;
16097 : bool isNull;
16098 : HeapTuple newtuple;
16099 :
16100 : /* skip permission checks when recursing to index or toast table */
16101 500 : if (!recursing)
16102 : {
16103 : /* Superusers can always do it */
16104 282 : if (!superuser())
16105 : {
16106 42 : Oid namespaceOid = tuple_class->relnamespace;
16107 : AclResult aclresult;
16108 :
16109 : /* Otherwise, must be owner of the existing object */
16110 42 : if (!object_ownercheck(RelationRelationId, relationOid, GetUserId()))
16111 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relationOid)),
16112 0 : RelationGetRelationName(target_rel));
16113 :
16114 : /* Must be able to become new owner */
16115 42 : check_can_set_role(GetUserId(), newOwnerId);
16116 :
16117 : /* New owner must have CREATE privilege on namespace */
16118 30 : aclresult = object_aclcheck(NamespaceRelationId, namespaceOid, newOwnerId,
16119 : ACL_CREATE);
16120 30 : if (aclresult != ACLCHECK_OK)
16121 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
16122 0 : get_namespace_name(namespaceOid));
16123 : }
16124 : }
16125 :
16126 488 : memset(repl_null, false, sizeof(repl_null));
16127 488 : memset(repl_repl, false, sizeof(repl_repl));
16128 :
16129 488 : repl_repl[Anum_pg_class_relowner - 1] = true;
16130 488 : repl_val[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(newOwnerId);
16131 :
16132 : /*
16133 : * Determine the modified ACL for the new owner. This is only
16134 : * necessary when the ACL is non-null.
16135 : */
16136 488 : aclDatum = SysCacheGetAttr(RELOID, tuple,
16137 : Anum_pg_class_relacl,
16138 : &isNull);
16139 488 : if (!isNull)
16140 : {
16141 46 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16142 : tuple_class->relowner, newOwnerId);
16143 46 : repl_repl[Anum_pg_class_relacl - 1] = true;
16144 46 : repl_val[Anum_pg_class_relacl - 1] = PointerGetDatum(newAcl);
16145 : }
16146 :
16147 488 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(class_rel), repl_val, repl_null, repl_repl);
16148 :
16149 488 : CatalogTupleUpdate(class_rel, &newtuple->t_self, newtuple);
16150 :
16151 488 : heap_freetuple(newtuple);
16152 :
16153 : /*
16154 : * We must similarly update any per-column ACLs to reflect the new
16155 : * owner; for neatness reasons that's split out as a subroutine.
16156 : */
16157 488 : change_owner_fix_column_acls(relationOid,
16158 : tuple_class->relowner,
16159 : newOwnerId);
16160 :
16161 : /*
16162 : * Update owner dependency reference, if any. A composite type has
16163 : * none, because it's tracked for the pg_type entry instead of here;
16164 : * indexes and TOAST tables don't have their own entries either.
16165 : */
16166 488 : if (tuple_class->relkind != RELKIND_COMPOSITE_TYPE &&
16167 480 : tuple_class->relkind != RELKIND_INDEX &&
16168 384 : tuple_class->relkind != RELKIND_PARTITIONED_INDEX &&
16169 364 : tuple_class->relkind != RELKIND_TOASTVALUE)
16170 322 : changeDependencyOnOwner(RelationRelationId, relationOid,
16171 : newOwnerId);
16172 :
16173 : /*
16174 : * Also change the ownership of the table's row type, if it has one
16175 : */
16176 488 : if (OidIsValid(tuple_class->reltype))
16177 296 : AlterTypeOwnerInternal(tuple_class->reltype, newOwnerId);
16178 :
16179 : /*
16180 : * If we are operating on a table or materialized view, also change
16181 : * the ownership of any indexes and sequences that belong to the
16182 : * relation, as well as its toast table (if it has one).
16183 : */
16184 488 : if (tuple_class->relkind == RELKIND_RELATION ||
16185 262 : tuple_class->relkind == RELKIND_PARTITIONED_TABLE ||
16186 224 : tuple_class->relkind == RELKIND_MATVIEW ||
16187 224 : tuple_class->relkind == RELKIND_TOASTVALUE)
16188 : {
16189 : List *index_oid_list;
16190 : ListCell *i;
16191 :
16192 : /* Find all the indexes belonging to this relation */
16193 306 : index_oid_list = RelationGetIndexList(target_rel);
16194 :
16195 : /* For each index, recursively change its ownership */
16196 422 : foreach(i, index_oid_list)
16197 116 : ATExecChangeOwner(lfirst_oid(i), newOwnerId, true, lockmode);
16198 :
16199 306 : list_free(index_oid_list);
16200 : }
16201 :
16202 : /* If it has a toast table, recurse to change its ownership */
16203 488 : if (tuple_class->reltoastrelid != InvalidOid)
16204 42 : ATExecChangeOwner(tuple_class->reltoastrelid, newOwnerId,
16205 : true, lockmode);
16206 :
16207 : /* If it has dependent sequences, recurse to change them too */
16208 488 : change_owner_recurse_to_sequences(relationOid, newOwnerId, lockmode);
16209 : }
16210 :
16211 3788 : InvokeObjectPostAlterHook(RelationRelationId, relationOid, 0);
16212 :
16213 3788 : ReleaseSysCache(tuple);
16214 3788 : table_close(class_rel, RowExclusiveLock);
16215 3788 : relation_close(target_rel, NoLock);
16216 3788 : }
16217 :
16218 : /*
16219 : * change_owner_fix_column_acls
16220 : *
16221 : * Helper function for ATExecChangeOwner. Scan the columns of the table
16222 : * and fix any non-null column ACLs to reflect the new owner.
16223 : */
16224 : static void
16225 488 : change_owner_fix_column_acls(Oid relationOid, Oid oldOwnerId, Oid newOwnerId)
16226 : {
16227 : Relation attRelation;
16228 : SysScanDesc scan;
16229 : ScanKeyData key[1];
16230 : HeapTuple attributeTuple;
16231 :
16232 488 : attRelation = table_open(AttributeRelationId, RowExclusiveLock);
16233 488 : ScanKeyInit(&key[0],
16234 : Anum_pg_attribute_attrelid,
16235 : BTEqualStrategyNumber, F_OIDEQ,
16236 : ObjectIdGetDatum(relationOid));
16237 488 : scan = systable_beginscan(attRelation, AttributeRelidNumIndexId,
16238 : true, NULL, 1, key);
16239 3386 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
16240 : {
16241 2898 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
16242 : Datum repl_val[Natts_pg_attribute];
16243 : bool repl_null[Natts_pg_attribute];
16244 : bool repl_repl[Natts_pg_attribute];
16245 : Acl *newAcl;
16246 : Datum aclDatum;
16247 : bool isNull;
16248 : HeapTuple newtuple;
16249 :
16250 : /* Ignore dropped columns */
16251 2898 : if (att->attisdropped)
16252 2896 : continue;
16253 :
16254 2898 : aclDatum = heap_getattr(attributeTuple,
16255 : Anum_pg_attribute_attacl,
16256 : RelationGetDescr(attRelation),
16257 : &isNull);
16258 : /* Null ACLs do not require changes */
16259 2898 : if (isNull)
16260 2896 : continue;
16261 :
16262 2 : memset(repl_null, false, sizeof(repl_null));
16263 2 : memset(repl_repl, false, sizeof(repl_repl));
16264 :
16265 2 : newAcl = aclnewowner(DatumGetAclP(aclDatum),
16266 : oldOwnerId, newOwnerId);
16267 2 : repl_repl[Anum_pg_attribute_attacl - 1] = true;
16268 2 : repl_val[Anum_pg_attribute_attacl - 1] = PointerGetDatum(newAcl);
16269 :
16270 2 : newtuple = heap_modify_tuple(attributeTuple,
16271 : RelationGetDescr(attRelation),
16272 : repl_val, repl_null, repl_repl);
16273 :
16274 2 : CatalogTupleUpdate(attRelation, &newtuple->t_self, newtuple);
16275 :
16276 2 : heap_freetuple(newtuple);
16277 : }
16278 488 : systable_endscan(scan);
16279 488 : table_close(attRelation, RowExclusiveLock);
16280 488 : }
16281 :
16282 : /*
16283 : * change_owner_recurse_to_sequences
16284 : *
16285 : * Helper function for ATExecChangeOwner. Examines pg_depend searching
16286 : * for sequences that are dependent on serial columns, and changes their
16287 : * ownership.
16288 : */
16289 : static void
16290 488 : change_owner_recurse_to_sequences(Oid relationOid, Oid newOwnerId, LOCKMODE lockmode)
16291 : {
16292 : Relation depRel;
16293 : SysScanDesc scan;
16294 : ScanKeyData key[2];
16295 : HeapTuple tup;
16296 :
16297 : /*
16298 : * SERIAL sequences are those having an auto dependency on one of the
16299 : * table's columns (we don't care *which* column, exactly).
16300 : */
16301 488 : depRel = table_open(DependRelationId, AccessShareLock);
16302 :
16303 488 : ScanKeyInit(&key[0],
16304 : Anum_pg_depend_refclassid,
16305 : BTEqualStrategyNumber, F_OIDEQ,
16306 : ObjectIdGetDatum(RelationRelationId));
16307 488 : ScanKeyInit(&key[1],
16308 : Anum_pg_depend_refobjid,
16309 : BTEqualStrategyNumber, F_OIDEQ,
16310 : ObjectIdGetDatum(relationOid));
16311 : /* we leave refobjsubid unspecified */
16312 :
16313 488 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
16314 : NULL, 2, key);
16315 :
16316 1378 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
16317 : {
16318 890 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
16319 : Relation seqRel;
16320 :
16321 : /* skip dependencies other than auto dependencies on columns */
16322 890 : if (depForm->refobjsubid == 0 ||
16323 352 : depForm->classid != RelationRelationId ||
16324 142 : depForm->objsubid != 0 ||
16325 142 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
16326 748 : continue;
16327 :
16328 : /* Use relation_open just in case it's an index */
16329 142 : seqRel = relation_open(depForm->objid, lockmode);
16330 :
16331 : /* skip non-sequence relations */
16332 142 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
16333 : {
16334 : /* No need to keep the lock */
16335 116 : relation_close(seqRel, lockmode);
16336 116 : continue;
16337 : }
16338 :
16339 : /* We don't need to close the sequence while we alter it. */
16340 26 : ATExecChangeOwner(depForm->objid, newOwnerId, true, lockmode);
16341 :
16342 : /* Now we can close it. Keep the lock till end of transaction. */
16343 26 : relation_close(seqRel, NoLock);
16344 : }
16345 :
16346 488 : systable_endscan(scan);
16347 :
16348 488 : relation_close(depRel, AccessShareLock);
16349 488 : }
16350 :
16351 : /*
16352 : * ALTER TABLE CLUSTER ON
16353 : *
16354 : * The only thing we have to do is to change the indisclustered bits.
16355 : *
16356 : * Return the address of the new clustering index.
16357 : */
16358 : static ObjectAddress
16359 64 : ATExecClusterOn(Relation rel, const char *indexName, LOCKMODE lockmode)
16360 : {
16361 : Oid indexOid;
16362 : ObjectAddress address;
16363 :
16364 64 : indexOid = get_relname_relid(indexName, rel->rd_rel->relnamespace);
16365 :
16366 64 : if (!OidIsValid(indexOid))
16367 0 : ereport(ERROR,
16368 : (errcode(ERRCODE_UNDEFINED_OBJECT),
16369 : errmsg("index \"%s\" for table \"%s\" does not exist",
16370 : indexName, RelationGetRelationName(rel))));
16371 :
16372 : /* Check index is valid to cluster on */
16373 64 : check_index_is_clusterable(rel, indexOid, lockmode);
16374 :
16375 : /* And do the work */
16376 64 : mark_index_clustered(rel, indexOid, false);
16377 :
16378 58 : ObjectAddressSet(address,
16379 : RelationRelationId, indexOid);
16380 :
16381 58 : return address;
16382 : }
16383 :
16384 : /*
16385 : * ALTER TABLE SET WITHOUT CLUSTER
16386 : *
16387 : * We have to find any indexes on the table that have indisclustered bit
16388 : * set and turn it off.
16389 : */
16390 : static void
16391 18 : ATExecDropCluster(Relation rel, LOCKMODE lockmode)
16392 : {
16393 18 : mark_index_clustered(rel, InvalidOid, false);
16394 12 : }
16395 :
16396 : /*
16397 : * Preparation phase for SET ACCESS METHOD
16398 : *
16399 : * Check that the access method exists and determine whether a change is
16400 : * actually needed.
16401 : */
16402 : static void
16403 110 : ATPrepSetAccessMethod(AlteredTableInfo *tab, Relation rel, const char *amname)
16404 : {
16405 : Oid amoid;
16406 :
16407 : /*
16408 : * Look up the access method name and check that it differs from the
16409 : * table's current AM. If DEFAULT was specified for a partitioned table
16410 : * (amname is NULL), set it to InvalidOid to reset the catalogued AM.
16411 : */
16412 110 : if (amname != NULL)
16413 74 : amoid = get_table_am_oid(amname, false);
16414 36 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
16415 18 : amoid = InvalidOid;
16416 : else
16417 18 : amoid = get_table_am_oid(default_table_access_method, false);
16418 :
16419 : /* if it's a match, phase 3 doesn't need to do anything */
16420 110 : if (rel->rd_rel->relam == amoid)
16421 12 : return;
16422 :
16423 : /* Save info for Phase 3 to do the real work */
16424 98 : tab->rewrite |= AT_REWRITE_ACCESS_METHOD;
16425 98 : tab->newAccessMethod = amoid;
16426 98 : tab->chgAccessMethod = true;
16427 : }
16428 :
16429 : /*
16430 : * Special handling of ALTER TABLE SET ACCESS METHOD for relations with no
16431 : * storage that have an interest in preserving AM.
16432 : *
16433 : * Since these have no storage, setting the access method is a catalog only
16434 : * operation.
16435 : */
16436 : static void
16437 44 : ATExecSetAccessMethodNoStorage(Relation rel, Oid newAccessMethodId)
16438 : {
16439 : Relation pg_class;
16440 : Oid oldAccessMethodId;
16441 : HeapTuple tuple;
16442 : Form_pg_class rd_rel;
16443 44 : Oid reloid = RelationGetRelid(rel);
16444 :
16445 : /*
16446 : * Shouldn't be called on relations having storage; these are processed in
16447 : * phase 3.
16448 : */
16449 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16450 :
16451 : /* Get a modifiable copy of the relation's pg_class row. */
16452 44 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
16453 :
16454 44 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(reloid));
16455 44 : if (!HeapTupleIsValid(tuple))
16456 0 : elog(ERROR, "cache lookup failed for relation %u", reloid);
16457 44 : rd_rel = (Form_pg_class) GETSTRUCT(tuple);
16458 :
16459 : /* Update the pg_class row. */
16460 44 : oldAccessMethodId = rd_rel->relam;
16461 44 : rd_rel->relam = newAccessMethodId;
16462 :
16463 : /* Leave if no update required */
16464 44 : if (rd_rel->relam == oldAccessMethodId)
16465 : {
16466 0 : heap_freetuple(tuple);
16467 0 : table_close(pg_class, RowExclusiveLock);
16468 0 : return;
16469 : }
16470 :
16471 44 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
16472 :
16473 : /*
16474 : * Update the dependency on the new access method. No dependency is added
16475 : * if the new access method is InvalidOid (default case). Be very careful
16476 : * that this has to compare the previous value stored in pg_class with the
16477 : * new one.
16478 : */
16479 44 : if (!OidIsValid(oldAccessMethodId) && OidIsValid(rd_rel->relam))
16480 20 : {
16481 : ObjectAddress relobj,
16482 : referenced;
16483 :
16484 : /*
16485 : * New access method is defined and there was no dependency
16486 : * previously, so record a new one.
16487 : */
16488 20 : ObjectAddressSet(relobj, RelationRelationId, reloid);
16489 20 : ObjectAddressSet(referenced, AccessMethodRelationId, rd_rel->relam);
16490 20 : recordDependencyOn(&relobj, &referenced, DEPENDENCY_NORMAL);
16491 : }
16492 24 : else if (OidIsValid(oldAccessMethodId) &&
16493 24 : !OidIsValid(rd_rel->relam))
16494 : {
16495 : /*
16496 : * There was an access method defined, and no new one, so just remove
16497 : * the existing dependency.
16498 : */
16499 12 : deleteDependencyRecordsForClass(RelationRelationId, reloid,
16500 : AccessMethodRelationId,
16501 : DEPENDENCY_NORMAL);
16502 : }
16503 : else
16504 : {
16505 : Assert(OidIsValid(oldAccessMethodId) &&
16506 : OidIsValid(rd_rel->relam));
16507 :
16508 : /* Both are valid, so update the dependency */
16509 12 : changeDependencyFor(RelationRelationId, reloid,
16510 : AccessMethodRelationId,
16511 : oldAccessMethodId, rd_rel->relam);
16512 : }
16513 :
16514 : /* make the relam and dependency changes visible */
16515 44 : CommandCounterIncrement();
16516 :
16517 44 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16518 :
16519 44 : heap_freetuple(tuple);
16520 44 : table_close(pg_class, RowExclusiveLock);
16521 : }
16522 :
16523 : /*
16524 : * ALTER TABLE SET TABLESPACE
16525 : */
16526 : static void
16527 158 : ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel, const char *tablespacename, LOCKMODE lockmode)
16528 : {
16529 : Oid tablespaceId;
16530 :
16531 : /* Check that the tablespace exists */
16532 158 : tablespaceId = get_tablespace_oid(tablespacename, false);
16533 :
16534 : /* Check permissions except when moving to database's default */
16535 158 : if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
16536 : {
16537 : AclResult aclresult;
16538 :
16539 66 : aclresult = object_aclcheck(TableSpaceRelationId, tablespaceId, GetUserId(), ACL_CREATE);
16540 66 : if (aclresult != ACLCHECK_OK)
16541 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE, tablespacename);
16542 : }
16543 :
16544 : /* Save info for Phase 3 to do the real work */
16545 158 : if (OidIsValid(tab->newTableSpace))
16546 0 : ereport(ERROR,
16547 : (errcode(ERRCODE_SYNTAX_ERROR),
16548 : errmsg("cannot have multiple SET TABLESPACE subcommands")));
16549 :
16550 158 : tab->newTableSpace = tablespaceId;
16551 158 : }
16552 :
16553 : /*
16554 : * Set, reset, or replace reloptions.
16555 : */
16556 : static void
16557 958 : ATExecSetRelOptions(Relation rel, List *defList, AlterTableType operation,
16558 : LOCKMODE lockmode)
16559 : {
16560 : Oid relid;
16561 : Relation pgclass;
16562 : HeapTuple tuple;
16563 : HeapTuple newtuple;
16564 : Datum datum;
16565 : Datum newOptions;
16566 : Datum repl_val[Natts_pg_class];
16567 : bool repl_null[Natts_pg_class];
16568 : bool repl_repl[Natts_pg_class];
16569 958 : const char *const validnsps[] = HEAP_RELOPT_NAMESPACES;
16570 :
16571 958 : if (defList == NIL && operation != AT_ReplaceRelOptions)
16572 0 : return; /* nothing to do */
16573 :
16574 958 : pgclass = table_open(RelationRelationId, RowExclusiveLock);
16575 :
16576 : /* Fetch heap tuple */
16577 958 : relid = RelationGetRelid(rel);
16578 958 : tuple = SearchSysCacheLocked1(RELOID, ObjectIdGetDatum(relid));
16579 958 : if (!HeapTupleIsValid(tuple))
16580 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
16581 :
16582 958 : if (operation == AT_ReplaceRelOptions)
16583 : {
16584 : /*
16585 : * If we're supposed to replace the reloptions list, we just pretend
16586 : * there were none before.
16587 : */
16588 198 : datum = (Datum) 0;
16589 : }
16590 : else
16591 : {
16592 : bool isnull;
16593 :
16594 : /* Get the old reloptions */
16595 760 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16596 : &isnull);
16597 760 : if (isnull)
16598 472 : datum = (Datum) 0;
16599 : }
16600 :
16601 : /* Generate new proposed reloptions (text array) */
16602 958 : newOptions = transformRelOptions(datum, defList, NULL, validnsps, false,
16603 : operation == AT_ResetRelOptions);
16604 :
16605 : /* Validate */
16606 952 : switch (rel->rd_rel->relkind)
16607 : {
16608 530 : case RELKIND_RELATION:
16609 : case RELKIND_MATVIEW:
16610 530 : (void) heap_reloptions(rel->rd_rel->relkind, newOptions, true);
16611 530 : break;
16612 6 : case RELKIND_PARTITIONED_TABLE:
16613 6 : (void) partitioned_table_reloptions(newOptions, true);
16614 0 : break;
16615 300 : case RELKIND_VIEW:
16616 300 : (void) view_reloptions(newOptions, true);
16617 282 : break;
16618 116 : case RELKIND_INDEX:
16619 : case RELKIND_PARTITIONED_INDEX:
16620 116 : (void) index_reloptions(rel->rd_indam->amoptions, newOptions, true);
16621 94 : break;
16622 0 : case RELKIND_TOASTVALUE:
16623 : /* fall through to error -- shouldn't ever get here */
16624 : default:
16625 0 : ereport(ERROR,
16626 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
16627 : errmsg("cannot set options for relation \"%s\"",
16628 : RelationGetRelationName(rel)),
16629 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
16630 : break;
16631 : }
16632 :
16633 : /* Special-case validation of view options */
16634 906 : if (rel->rd_rel->relkind == RELKIND_VIEW)
16635 : {
16636 282 : Query *view_query = get_view_query(rel);
16637 282 : List *view_options = untransformRelOptions(newOptions);
16638 : ListCell *cell;
16639 282 : bool check_option = false;
16640 :
16641 384 : foreach(cell, view_options)
16642 : {
16643 102 : DefElem *defel = (DefElem *) lfirst(cell);
16644 :
16645 102 : if (strcmp(defel->defname, "check_option") == 0)
16646 24 : check_option = true;
16647 : }
16648 :
16649 : /*
16650 : * If the check option is specified, look to see if the view is
16651 : * actually auto-updatable or not.
16652 : */
16653 282 : if (check_option)
16654 : {
16655 : const char *view_updatable_error =
16656 24 : view_query_is_auto_updatable(view_query, true);
16657 :
16658 24 : if (view_updatable_error)
16659 0 : ereport(ERROR,
16660 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
16661 : errmsg("WITH CHECK OPTION is supported only on automatically updatable views"),
16662 : errhint("%s", _(view_updatable_error))));
16663 : }
16664 : }
16665 :
16666 : /*
16667 : * All we need do here is update the pg_class row; the new options will be
16668 : * propagated into relcaches during post-commit cache inval.
16669 : */
16670 906 : memset(repl_val, 0, sizeof(repl_val));
16671 906 : memset(repl_null, false, sizeof(repl_null));
16672 906 : memset(repl_repl, false, sizeof(repl_repl));
16673 :
16674 906 : if (newOptions != (Datum) 0)
16675 608 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
16676 : else
16677 298 : repl_null[Anum_pg_class_reloptions - 1] = true;
16678 :
16679 906 : repl_repl[Anum_pg_class_reloptions - 1] = true;
16680 :
16681 906 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
16682 : repl_val, repl_null, repl_repl);
16683 :
16684 906 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
16685 906 : UnlockTuple(pgclass, &tuple->t_self, InplaceUpdateTupleLock);
16686 :
16687 906 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16688 :
16689 906 : heap_freetuple(newtuple);
16690 :
16691 906 : ReleaseSysCache(tuple);
16692 :
16693 : /* repeat the whole exercise for the toast table, if there's one */
16694 906 : if (OidIsValid(rel->rd_rel->reltoastrelid))
16695 : {
16696 : Relation toastrel;
16697 262 : Oid toastid = rel->rd_rel->reltoastrelid;
16698 :
16699 262 : toastrel = table_open(toastid, lockmode);
16700 :
16701 : /* Fetch heap tuple */
16702 262 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(toastid));
16703 262 : if (!HeapTupleIsValid(tuple))
16704 0 : elog(ERROR, "cache lookup failed for relation %u", toastid);
16705 :
16706 262 : if (operation == AT_ReplaceRelOptions)
16707 : {
16708 : /*
16709 : * If we're supposed to replace the reloptions list, we just
16710 : * pretend there were none before.
16711 : */
16712 0 : datum = (Datum) 0;
16713 : }
16714 : else
16715 : {
16716 : bool isnull;
16717 :
16718 : /* Get the old reloptions */
16719 262 : datum = SysCacheGetAttr(RELOID, tuple, Anum_pg_class_reloptions,
16720 : &isnull);
16721 262 : if (isnull)
16722 226 : datum = (Datum) 0;
16723 : }
16724 :
16725 262 : newOptions = transformRelOptions(datum, defList, "toast", validnsps,
16726 : false, operation == AT_ResetRelOptions);
16727 :
16728 262 : (void) heap_reloptions(RELKIND_TOASTVALUE, newOptions, true);
16729 :
16730 262 : memset(repl_val, 0, sizeof(repl_val));
16731 262 : memset(repl_null, false, sizeof(repl_null));
16732 262 : memset(repl_repl, false, sizeof(repl_repl));
16733 :
16734 262 : if (newOptions != (Datum) 0)
16735 42 : repl_val[Anum_pg_class_reloptions - 1] = newOptions;
16736 : else
16737 220 : repl_null[Anum_pg_class_reloptions - 1] = true;
16738 :
16739 262 : repl_repl[Anum_pg_class_reloptions - 1] = true;
16740 :
16741 262 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(pgclass),
16742 : repl_val, repl_null, repl_repl);
16743 :
16744 262 : CatalogTupleUpdate(pgclass, &newtuple->t_self, newtuple);
16745 :
16746 262 : InvokeObjectPostAlterHookArg(RelationRelationId,
16747 : RelationGetRelid(toastrel), 0,
16748 : InvalidOid, true);
16749 :
16750 262 : heap_freetuple(newtuple);
16751 :
16752 262 : ReleaseSysCache(tuple);
16753 :
16754 262 : table_close(toastrel, NoLock);
16755 : }
16756 :
16757 906 : table_close(pgclass, RowExclusiveLock);
16758 : }
16759 :
16760 : /*
16761 : * Execute ALTER TABLE SET TABLESPACE for cases where there is no tuple
16762 : * rewriting to be done, so we just want to copy the data as fast as possible.
16763 : */
16764 : static void
16765 162 : ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode)
16766 : {
16767 : Relation rel;
16768 : Oid reltoastrelid;
16769 : RelFileNumber newrelfilenumber;
16770 : RelFileLocator newrlocator;
16771 162 : List *reltoastidxids = NIL;
16772 : ListCell *lc;
16773 :
16774 : /*
16775 : * Need lock here in case we are recursing to toast table or index
16776 : */
16777 162 : rel = relation_open(tableOid, lockmode);
16778 :
16779 : /* Check first if relation can be moved to new tablespace */
16780 162 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
16781 : {
16782 2 : InvokeObjectPostAlterHook(RelationRelationId,
16783 : RelationGetRelid(rel), 0);
16784 2 : relation_close(rel, NoLock);
16785 2 : return;
16786 : }
16787 :
16788 160 : reltoastrelid = rel->rd_rel->reltoastrelid;
16789 : /* Fetch the list of indexes on toast relation if necessary */
16790 160 : if (OidIsValid(reltoastrelid))
16791 : {
16792 20 : Relation toastRel = relation_open(reltoastrelid, lockmode);
16793 :
16794 20 : reltoastidxids = RelationGetIndexList(toastRel);
16795 20 : relation_close(toastRel, lockmode);
16796 : }
16797 :
16798 : /*
16799 : * Relfilenumbers are not unique in databases across tablespaces, so we
16800 : * need to allocate a new one in the new tablespace.
16801 : */
16802 160 : newrelfilenumber = GetNewRelFileNumber(newTableSpace, NULL,
16803 160 : rel->rd_rel->relpersistence);
16804 :
16805 : /* Open old and new relation */
16806 160 : newrlocator = rel->rd_locator;
16807 160 : newrlocator.relNumber = newrelfilenumber;
16808 160 : newrlocator.spcOid = newTableSpace;
16809 :
16810 : /* hand off to AM to actually create new rel storage and copy the data */
16811 160 : if (rel->rd_rel->relkind == RELKIND_INDEX)
16812 : {
16813 62 : index_copy_data(rel, newrlocator);
16814 : }
16815 : else
16816 : {
16817 : Assert(RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind));
16818 98 : table_relation_copy_data(rel, &newrlocator);
16819 : }
16820 :
16821 : /*
16822 : * Update the pg_class row.
16823 : *
16824 : * NB: This wouldn't work if ATExecSetTableSpace() were allowed to be
16825 : * executed on pg_class or its indexes (the above copy wouldn't contain
16826 : * the updated pg_class entry), but that's forbidden with
16827 : * CheckRelationTableSpaceMove().
16828 : */
16829 160 : SetRelationTableSpace(rel, newTableSpace, newrelfilenumber);
16830 :
16831 160 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16832 :
16833 160 : RelationAssumeNewRelfilelocator(rel);
16834 :
16835 160 : relation_close(rel, NoLock);
16836 :
16837 : /* Make sure the reltablespace change is visible */
16838 160 : CommandCounterIncrement();
16839 :
16840 : /* Move associated toast relation and/or indexes, too */
16841 160 : if (OidIsValid(reltoastrelid))
16842 20 : ATExecSetTableSpace(reltoastrelid, newTableSpace, lockmode);
16843 180 : foreach(lc, reltoastidxids)
16844 20 : ATExecSetTableSpace(lfirst_oid(lc), newTableSpace, lockmode);
16845 :
16846 : /* Clean up */
16847 160 : list_free(reltoastidxids);
16848 : }
16849 :
16850 : /*
16851 : * Special handling of ALTER TABLE SET TABLESPACE for relations with no
16852 : * storage that have an interest in preserving tablespace.
16853 : *
16854 : * Since these have no storage the tablespace can be updated with a simple
16855 : * metadata only operation to update the tablespace.
16856 : */
16857 : static void
16858 36 : ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace)
16859 : {
16860 : /*
16861 : * Shouldn't be called on relations having storage; these are processed in
16862 : * phase 3.
16863 : */
16864 : Assert(!RELKIND_HAS_STORAGE(rel->rd_rel->relkind));
16865 :
16866 : /* check if relation can be moved to its new tablespace */
16867 36 : if (!CheckRelationTableSpaceMove(rel, newTableSpace))
16868 : {
16869 0 : InvokeObjectPostAlterHook(RelationRelationId,
16870 : RelationGetRelid(rel),
16871 : 0);
16872 0 : return;
16873 : }
16874 :
16875 : /* Update can be done, so change reltablespace */
16876 30 : SetRelationTableSpace(rel, newTableSpace, InvalidOid);
16877 :
16878 30 : InvokeObjectPostAlterHook(RelationRelationId, RelationGetRelid(rel), 0);
16879 :
16880 : /* Make sure the reltablespace change is visible */
16881 30 : CommandCounterIncrement();
16882 : }
16883 :
16884 : /*
16885 : * Alter Table ALL ... SET TABLESPACE
16886 : *
16887 : * Allows a user to move all objects of some type in a given tablespace in the
16888 : * current database to another tablespace. Objects can be chosen based on the
16889 : * owner of the object also, to allow users to move only their objects.
16890 : * The user must have CREATE rights on the new tablespace, as usual. The main
16891 : * permissions handling is done by the lower-level table move function.
16892 : *
16893 : * All to-be-moved objects are locked first. If NOWAIT is specified and the
16894 : * lock can't be acquired then we ereport(ERROR).
16895 : */
16896 : Oid
16897 30 : AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
16898 : {
16899 30 : List *relations = NIL;
16900 : ListCell *l;
16901 : ScanKeyData key[1];
16902 : Relation rel;
16903 : TableScanDesc scan;
16904 : HeapTuple tuple;
16905 : Oid orig_tablespaceoid;
16906 : Oid new_tablespaceoid;
16907 30 : List *role_oids = roleSpecsToIds(stmt->roles);
16908 :
16909 : /* Ensure we were not asked to move something we can't */
16910 30 : if (stmt->objtype != OBJECT_TABLE && stmt->objtype != OBJECT_INDEX &&
16911 12 : stmt->objtype != OBJECT_MATVIEW)
16912 0 : ereport(ERROR,
16913 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
16914 : errmsg("only tables, indexes, and materialized views exist in tablespaces")));
16915 :
16916 : /* Get the orig and new tablespace OIDs */
16917 30 : orig_tablespaceoid = get_tablespace_oid(stmt->orig_tablespacename, false);
16918 30 : new_tablespaceoid = get_tablespace_oid(stmt->new_tablespacename, false);
16919 :
16920 : /* Can't move shared relations in to or out of pg_global */
16921 : /* This is also checked by ATExecSetTableSpace, but nice to stop earlier */
16922 30 : if (orig_tablespaceoid == GLOBALTABLESPACE_OID ||
16923 : new_tablespaceoid == GLOBALTABLESPACE_OID)
16924 0 : ereport(ERROR,
16925 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
16926 : errmsg("cannot move relations in to or out of pg_global tablespace")));
16927 :
16928 : /*
16929 : * Must have CREATE rights on the new tablespace, unless it is the
16930 : * database default tablespace (which all users implicitly have CREATE
16931 : * rights on).
16932 : */
16933 30 : if (OidIsValid(new_tablespaceoid) && new_tablespaceoid != MyDatabaseTableSpace)
16934 : {
16935 : AclResult aclresult;
16936 :
16937 0 : aclresult = object_aclcheck(TableSpaceRelationId, new_tablespaceoid, GetUserId(),
16938 : ACL_CREATE);
16939 0 : if (aclresult != ACLCHECK_OK)
16940 0 : aclcheck_error(aclresult, OBJECT_TABLESPACE,
16941 0 : get_tablespace_name(new_tablespaceoid));
16942 : }
16943 :
16944 : /*
16945 : * Now that the checks are done, check if we should set either to
16946 : * InvalidOid because it is our database's default tablespace.
16947 : */
16948 30 : if (orig_tablespaceoid == MyDatabaseTableSpace)
16949 0 : orig_tablespaceoid = InvalidOid;
16950 :
16951 30 : if (new_tablespaceoid == MyDatabaseTableSpace)
16952 30 : new_tablespaceoid = InvalidOid;
16953 :
16954 : /* no-op */
16955 30 : if (orig_tablespaceoid == new_tablespaceoid)
16956 0 : return new_tablespaceoid;
16957 :
16958 : /*
16959 : * Walk the list of objects in the tablespace and move them. This will
16960 : * only find objects in our database, of course.
16961 : */
16962 30 : ScanKeyInit(&key[0],
16963 : Anum_pg_class_reltablespace,
16964 : BTEqualStrategyNumber, F_OIDEQ,
16965 : ObjectIdGetDatum(orig_tablespaceoid));
16966 :
16967 30 : rel = table_open(RelationRelationId, AccessShareLock);
16968 30 : scan = table_beginscan_catalog(rel, 1, key);
16969 132 : while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
16970 : {
16971 102 : Form_pg_class relForm = (Form_pg_class) GETSTRUCT(tuple);
16972 102 : Oid relOid = relForm->oid;
16973 :
16974 : /*
16975 : * Do not move objects in pg_catalog as part of this, if an admin
16976 : * really wishes to do so, they can issue the individual ALTER
16977 : * commands directly.
16978 : *
16979 : * Also, explicitly avoid any shared tables, temp tables, or TOAST
16980 : * (TOAST will be moved with the main table).
16981 : */
16982 102 : if (IsCatalogNamespace(relForm->relnamespace) ||
16983 204 : relForm->relisshared ||
16984 204 : isAnyTempNamespace(relForm->relnamespace) ||
16985 102 : IsToastNamespace(relForm->relnamespace))
16986 0 : continue;
16987 :
16988 : /* Only move the object type requested */
16989 102 : if ((stmt->objtype == OBJECT_TABLE &&
16990 60 : relForm->relkind != RELKIND_RELATION &&
16991 36 : relForm->relkind != RELKIND_PARTITIONED_TABLE) ||
16992 66 : (stmt->objtype == OBJECT_INDEX &&
16993 36 : relForm->relkind != RELKIND_INDEX &&
16994 6 : relForm->relkind != RELKIND_PARTITIONED_INDEX) ||
16995 60 : (stmt->objtype == OBJECT_MATVIEW &&
16996 6 : relForm->relkind != RELKIND_MATVIEW))
16997 42 : continue;
16998 :
16999 : /* Check if we are only moving objects owned by certain roles */
17000 60 : if (role_oids != NIL && !list_member_oid(role_oids, relForm->relowner))
17001 0 : continue;
17002 :
17003 : /*
17004 : * Handle permissions-checking here since we are locking the tables
17005 : * and also to avoid doing a bunch of work only to fail part-way. Note
17006 : * that permissions will also be checked by AlterTableInternal().
17007 : *
17008 : * Caller must be considered an owner on the table to move it.
17009 : */
17010 60 : if (!object_ownercheck(RelationRelationId, relOid, GetUserId()))
17011 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relOid)),
17012 0 : NameStr(relForm->relname));
17013 :
17014 60 : if (stmt->nowait &&
17015 0 : !ConditionalLockRelationOid(relOid, AccessExclusiveLock))
17016 0 : ereport(ERROR,
17017 : (errcode(ERRCODE_OBJECT_IN_USE),
17018 : errmsg("aborting because lock on relation \"%s.%s\" is not available",
17019 : get_namespace_name(relForm->relnamespace),
17020 : NameStr(relForm->relname))));
17021 : else
17022 60 : LockRelationOid(relOid, AccessExclusiveLock);
17023 :
17024 : /* Add to our list of objects to move */
17025 60 : relations = lappend_oid(relations, relOid);
17026 : }
17027 :
17028 30 : table_endscan(scan);
17029 30 : table_close(rel, AccessShareLock);
17030 :
17031 30 : if (relations == NIL)
17032 12 : ereport(NOTICE,
17033 : (errcode(ERRCODE_NO_DATA_FOUND),
17034 : errmsg("no matching relations in tablespace \"%s\" found",
17035 : orig_tablespaceoid == InvalidOid ? "(database default)" :
17036 : get_tablespace_name(orig_tablespaceoid))));
17037 :
17038 : /* Everything is locked, loop through and move all of the relations. */
17039 90 : foreach(l, relations)
17040 : {
17041 60 : List *cmds = NIL;
17042 60 : AlterTableCmd *cmd = makeNode(AlterTableCmd);
17043 :
17044 60 : cmd->subtype = AT_SetTableSpace;
17045 60 : cmd->name = stmt->new_tablespacename;
17046 :
17047 60 : cmds = lappend(cmds, cmd);
17048 :
17049 60 : EventTriggerAlterTableStart((Node *) stmt);
17050 : /* OID is set by AlterTableInternal */
17051 60 : AlterTableInternal(lfirst_oid(l), cmds, false);
17052 60 : EventTriggerAlterTableEnd();
17053 : }
17054 :
17055 30 : return new_tablespaceoid;
17056 : }
17057 :
17058 : static void
17059 62 : index_copy_data(Relation rel, RelFileLocator newrlocator)
17060 : {
17061 : SMgrRelation dstrel;
17062 :
17063 : /*
17064 : * Since we copy the file directly without looking at the shared buffers,
17065 : * we'd better first flush out any pages of the source relation that are
17066 : * in shared buffers. We assume no new changes will be made while we are
17067 : * holding exclusive lock on the rel.
17068 : */
17069 62 : FlushRelationBuffers(rel);
17070 :
17071 : /*
17072 : * Create and copy all forks of the relation, and schedule unlinking of
17073 : * old physical files.
17074 : *
17075 : * NOTE: any conflict in relfilenumber value will be caught in
17076 : * RelationCreateStorage().
17077 : */
17078 62 : dstrel = RelationCreateStorage(newrlocator, rel->rd_rel->relpersistence, true);
17079 :
17080 : /* copy main fork */
17081 62 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, MAIN_FORKNUM,
17082 62 : rel->rd_rel->relpersistence);
17083 :
17084 : /* copy those extra forks that exist */
17085 248 : for (ForkNumber forkNum = MAIN_FORKNUM + 1;
17086 186 : forkNum <= MAX_FORKNUM; forkNum++)
17087 : {
17088 186 : if (smgrexists(RelationGetSmgr(rel), forkNum))
17089 : {
17090 0 : smgrcreate(dstrel, forkNum, false);
17091 :
17092 : /*
17093 : * WAL log creation if the relation is persistent, or this is the
17094 : * init fork of an unlogged relation.
17095 : */
17096 0 : if (RelationIsPermanent(rel) ||
17097 0 : (rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
17098 : forkNum == INIT_FORKNUM))
17099 0 : log_smgrcreate(&newrlocator, forkNum);
17100 0 : RelationCopyStorage(RelationGetSmgr(rel), dstrel, forkNum,
17101 0 : rel->rd_rel->relpersistence);
17102 : }
17103 : }
17104 :
17105 : /* drop old relation, and close new one */
17106 62 : RelationDropStorage(rel);
17107 62 : smgrclose(dstrel);
17108 62 : }
17109 :
17110 : /*
17111 : * ALTER TABLE ENABLE/DISABLE TRIGGER
17112 : *
17113 : * We just pass this off to trigger.c.
17114 : */
17115 : static void
17116 346 : ATExecEnableDisableTrigger(Relation rel, const char *trigname,
17117 : char fires_when, bool skip_system, bool recurse,
17118 : LOCKMODE lockmode)
17119 : {
17120 346 : EnableDisableTrigger(rel, trigname, InvalidOid,
17121 : fires_when, skip_system, recurse,
17122 : lockmode);
17123 :
17124 346 : InvokeObjectPostAlterHook(RelationRelationId,
17125 : RelationGetRelid(rel), 0);
17126 346 : }
17127 :
17128 : /*
17129 : * ALTER TABLE ENABLE/DISABLE RULE
17130 : *
17131 : * We just pass this off to rewriteDefine.c.
17132 : */
17133 : static void
17134 52 : ATExecEnableDisableRule(Relation rel, const char *rulename,
17135 : char fires_when, LOCKMODE lockmode)
17136 : {
17137 52 : EnableDisableRule(rel, rulename, fires_when);
17138 :
17139 52 : InvokeObjectPostAlterHook(RelationRelationId,
17140 : RelationGetRelid(rel), 0);
17141 52 : }
17142 :
17143 : /*
17144 : * ALTER TABLE INHERIT
17145 : *
17146 : * Add a parent to the child's parents. This verifies that all the columns and
17147 : * check constraints of the parent appear in the child and that they have the
17148 : * same data types and expressions.
17149 : */
17150 : static void
17151 444 : ATPrepAddInherit(Relation child_rel)
17152 : {
17153 444 : if (child_rel->rd_rel->reloftype)
17154 6 : ereport(ERROR,
17155 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17156 : errmsg("cannot change inheritance of typed table")));
17157 :
17158 438 : if (child_rel->rd_rel->relispartition)
17159 6 : ereport(ERROR,
17160 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17161 : errmsg("cannot change inheritance of a partition")));
17162 :
17163 432 : if (child_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17164 6 : ereport(ERROR,
17165 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17166 : errmsg("cannot change inheritance of partitioned table")));
17167 426 : }
17168 :
17169 : /*
17170 : * Return the address of the new parent relation.
17171 : */
17172 : static ObjectAddress
17173 426 : ATExecAddInherit(Relation child_rel, RangeVar *parent, LOCKMODE lockmode)
17174 : {
17175 : Relation parent_rel;
17176 : List *children;
17177 : ObjectAddress address;
17178 : const char *trigger_name;
17179 :
17180 : /*
17181 : * A self-exclusive lock is needed here. See the similar case in
17182 : * MergeAttributes() for a full explanation.
17183 : */
17184 426 : parent_rel = table_openrv(parent, ShareUpdateExclusiveLock);
17185 :
17186 : /*
17187 : * Must be owner of both parent and child -- child was checked by
17188 : * ATSimplePermissions call in ATPrepCmd
17189 : */
17190 426 : ATSimplePermissions(AT_AddInherit, parent_rel,
17191 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
17192 :
17193 : /* Permanent rels cannot inherit from temporary ones */
17194 426 : if (parent_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17195 6 : child_rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
17196 0 : ereport(ERROR,
17197 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17198 : errmsg("cannot inherit from temporary relation \"%s\"",
17199 : RelationGetRelationName(parent_rel))));
17200 :
17201 : /* If parent rel is temp, it must belong to this session */
17202 426 : if (parent_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17203 6 : !parent_rel->rd_islocaltemp)
17204 0 : ereport(ERROR,
17205 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17206 : errmsg("cannot inherit from temporary relation of another session")));
17207 :
17208 : /* Ditto for the child */
17209 426 : if (child_rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
17210 6 : !child_rel->rd_islocaltemp)
17211 0 : ereport(ERROR,
17212 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17213 : errmsg("cannot inherit to temporary relation of another session")));
17214 :
17215 : /* Prevent partitioned tables from becoming inheritance parents */
17216 426 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17217 6 : ereport(ERROR,
17218 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17219 : errmsg("cannot inherit from partitioned table \"%s\"",
17220 : parent->relname)));
17221 :
17222 : /* Likewise for partitions */
17223 420 : if (parent_rel->rd_rel->relispartition)
17224 6 : ereport(ERROR,
17225 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17226 : errmsg("cannot inherit from a partition")));
17227 :
17228 : /*
17229 : * Prevent circularity by seeing if proposed parent inherits from child.
17230 : * (In particular, this disallows making a rel inherit from itself.)
17231 : *
17232 : * This is not completely bulletproof because of race conditions: in
17233 : * multi-level inheritance trees, someone else could concurrently be
17234 : * making another inheritance link that closes the loop but does not join
17235 : * either of the rels we have locked. Preventing that seems to require
17236 : * exclusive locks on the entire inheritance tree, which is a cure worse
17237 : * than the disease. find_all_inheritors() will cope with circularity
17238 : * anyway, so don't sweat it too much.
17239 : *
17240 : * We use weakest lock we can on child's children, namely AccessShareLock.
17241 : */
17242 414 : children = find_all_inheritors(RelationGetRelid(child_rel),
17243 : AccessShareLock, NULL);
17244 :
17245 414 : if (list_member_oid(children, RelationGetRelid(parent_rel)))
17246 12 : ereport(ERROR,
17247 : (errcode(ERRCODE_DUPLICATE_TABLE),
17248 : errmsg("circular inheritance not allowed"),
17249 : errdetail("\"%s\" is already a child of \"%s\".",
17250 : parent->relname,
17251 : RelationGetRelationName(child_rel))));
17252 :
17253 : /*
17254 : * If child_rel has row-level triggers with transition tables, we
17255 : * currently don't allow it to become an inheritance child. See also
17256 : * prohibitions in ATExecAttachPartition() and CreateTrigger().
17257 : */
17258 402 : trigger_name = FindTriggerIncompatibleWithInheritance(child_rel->trigdesc);
17259 402 : if (trigger_name != NULL)
17260 6 : ereport(ERROR,
17261 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
17262 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming an inheritance child",
17263 : trigger_name, RelationGetRelationName(child_rel)),
17264 : errdetail("ROW triggers with transition tables are not supported in inheritance hierarchies.")));
17265 :
17266 : /* OK to create inheritance */
17267 396 : CreateInheritance(child_rel, parent_rel, false);
17268 :
17269 306 : ObjectAddressSet(address, RelationRelationId,
17270 : RelationGetRelid(parent_rel));
17271 :
17272 : /* keep our lock on the parent relation until commit */
17273 306 : table_close(parent_rel, NoLock);
17274 :
17275 306 : return address;
17276 : }
17277 :
17278 : /*
17279 : * CreateInheritance
17280 : * Catalog manipulation portion of creating inheritance between a child
17281 : * table and a parent table.
17282 : *
17283 : * Common to ATExecAddInherit() and ATExecAttachPartition().
17284 : */
17285 : static void
17286 3036 : CreateInheritance(Relation child_rel, Relation parent_rel, bool ispartition)
17287 : {
17288 : Relation catalogRelation;
17289 : SysScanDesc scan;
17290 : ScanKeyData key;
17291 : HeapTuple inheritsTuple;
17292 : int32 inhseqno;
17293 :
17294 : /* Note: get RowExclusiveLock because we will write pg_inherits below. */
17295 3036 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17296 :
17297 : /*
17298 : * Check for duplicates in the list of parents, and determine the highest
17299 : * inhseqno already present; we'll use the next one for the new parent.
17300 : * Also, if proposed child is a partition, it cannot already be
17301 : * inheriting.
17302 : *
17303 : * Note: we do not reject the case where the child already inherits from
17304 : * the parent indirectly; CREATE TABLE doesn't reject comparable cases.
17305 : */
17306 3036 : ScanKeyInit(&key,
17307 : Anum_pg_inherits_inhrelid,
17308 : BTEqualStrategyNumber, F_OIDEQ,
17309 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17310 3036 : scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId,
17311 : true, NULL, 1, &key);
17312 :
17313 : /* inhseqno sequences start at 1 */
17314 3036 : inhseqno = 0;
17315 3104 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17316 : {
17317 74 : Form_pg_inherits inh = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17318 :
17319 74 : if (inh->inhparent == RelationGetRelid(parent_rel))
17320 6 : ereport(ERROR,
17321 : (errcode(ERRCODE_DUPLICATE_TABLE),
17322 : errmsg("relation \"%s\" would be inherited from more than once",
17323 : RelationGetRelationName(parent_rel))));
17324 :
17325 68 : if (inh->inhseqno > inhseqno)
17326 68 : inhseqno = inh->inhseqno;
17327 : }
17328 3030 : systable_endscan(scan);
17329 :
17330 : /* Match up the columns and bump attinhcount as needed */
17331 3030 : MergeAttributesIntoExisting(child_rel, parent_rel, ispartition);
17332 :
17333 : /* Match up the constraints and bump coninhcount as needed */
17334 2898 : MergeConstraintsIntoExisting(child_rel, parent_rel);
17335 :
17336 : /*
17337 : * OK, it looks valid. Make the catalog entries that show inheritance.
17338 : */
17339 2838 : StoreCatalogInheritance1(RelationGetRelid(child_rel),
17340 : RelationGetRelid(parent_rel),
17341 : inhseqno + 1,
17342 : catalogRelation,
17343 2838 : parent_rel->rd_rel->relkind ==
17344 : RELKIND_PARTITIONED_TABLE);
17345 :
17346 : /* Now we're done with pg_inherits */
17347 2838 : table_close(catalogRelation, RowExclusiveLock);
17348 2838 : }
17349 :
17350 : /*
17351 : * Obtain the source-text form of the constraint expression for a check
17352 : * constraint, given its pg_constraint tuple
17353 : */
17354 : static char *
17355 188 : decompile_conbin(HeapTuple contup, TupleDesc tupdesc)
17356 : {
17357 : Form_pg_constraint con;
17358 : bool isnull;
17359 : Datum attr;
17360 : Datum expr;
17361 :
17362 188 : con = (Form_pg_constraint) GETSTRUCT(contup);
17363 188 : attr = heap_getattr(contup, Anum_pg_constraint_conbin, tupdesc, &isnull);
17364 188 : if (isnull)
17365 0 : elog(ERROR, "null conbin for constraint %u", con->oid);
17366 :
17367 188 : expr = DirectFunctionCall2(pg_get_expr, attr,
17368 : ObjectIdGetDatum(con->conrelid));
17369 188 : return TextDatumGetCString(expr);
17370 : }
17371 :
17372 : /*
17373 : * Determine whether two check constraints are functionally equivalent
17374 : *
17375 : * The test we apply is to see whether they reverse-compile to the same
17376 : * source string. This insulates us from issues like whether attributes
17377 : * have the same physical column numbers in parent and child relations.
17378 : *
17379 : * Note that we ignore enforceability as there are cases where constraints
17380 : * with differing enforceability are allowed.
17381 : */
17382 : static bool
17383 94 : constraints_equivalent(HeapTuple a, HeapTuple b, TupleDesc tupleDesc)
17384 : {
17385 94 : Form_pg_constraint acon = (Form_pg_constraint) GETSTRUCT(a);
17386 94 : Form_pg_constraint bcon = (Form_pg_constraint) GETSTRUCT(b);
17387 :
17388 94 : if (acon->condeferrable != bcon->condeferrable ||
17389 94 : acon->condeferred != bcon->condeferred ||
17390 94 : strcmp(decompile_conbin(a, tupleDesc),
17391 94 : decompile_conbin(b, tupleDesc)) != 0)
17392 6 : return false;
17393 : else
17394 88 : return true;
17395 : }
17396 :
17397 : /*
17398 : * Check columns in child table match up with columns in parent, and increment
17399 : * their attinhcount.
17400 : *
17401 : * Called by CreateInheritance
17402 : *
17403 : * Currently all parent columns must be found in child. Missing columns are an
17404 : * error. One day we might consider creating new columns like CREATE TABLE
17405 : * does. However, that is widely unpopular --- in the common use case of
17406 : * partitioned tables it's a foot-gun.
17407 : *
17408 : * The data type must match exactly. If the parent column is NOT NULL then
17409 : * the child must be as well. Defaults are not compared, however.
17410 : */
17411 : static void
17412 3030 : MergeAttributesIntoExisting(Relation child_rel, Relation parent_rel, bool ispartition)
17413 : {
17414 : Relation attrrel;
17415 : TupleDesc parent_desc;
17416 :
17417 3030 : attrrel = table_open(AttributeRelationId, RowExclusiveLock);
17418 3030 : parent_desc = RelationGetDescr(parent_rel);
17419 :
17420 9736 : for (AttrNumber parent_attno = 1; parent_attno <= parent_desc->natts; parent_attno++)
17421 : {
17422 6838 : Form_pg_attribute parent_att = TupleDescAttr(parent_desc, parent_attno - 1);
17423 6838 : char *parent_attname = NameStr(parent_att->attname);
17424 : HeapTuple tuple;
17425 :
17426 : /* Ignore dropped columns in the parent. */
17427 6838 : if (parent_att->attisdropped)
17428 296 : continue;
17429 :
17430 : /* Find same column in child (matching on column name). */
17431 6542 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(child_rel), parent_attname);
17432 6542 : if (HeapTupleIsValid(tuple))
17433 : {
17434 6530 : Form_pg_attribute child_att = (Form_pg_attribute) GETSTRUCT(tuple);
17435 :
17436 6530 : if (parent_att->atttypid != child_att->atttypid ||
17437 6524 : parent_att->atttypmod != child_att->atttypmod)
17438 12 : ereport(ERROR,
17439 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17440 : errmsg("child table \"%s\" has different type for column \"%s\"",
17441 : RelationGetRelationName(child_rel), parent_attname)));
17442 :
17443 6518 : if (parent_att->attcollation != child_att->attcollation)
17444 6 : ereport(ERROR,
17445 : (errcode(ERRCODE_COLLATION_MISMATCH),
17446 : errmsg("child table \"%s\" has different collation for column \"%s\"",
17447 : RelationGetRelationName(child_rel), parent_attname)));
17448 :
17449 : /*
17450 : * If the parent has a not-null constraint that's not NO INHERIT,
17451 : * make sure the child has one too.
17452 : *
17453 : * Other constraints are checked elsewhere.
17454 : */
17455 6512 : if (parent_att->attnotnull && !child_att->attnotnull)
17456 : {
17457 : HeapTuple contup;
17458 :
17459 48 : contup = findNotNullConstraintAttnum(RelationGetRelid(parent_rel),
17460 48 : parent_att->attnum);
17461 48 : if (HeapTupleIsValid(contup) &&
17462 48 : !((Form_pg_constraint) GETSTRUCT(contup))->connoinherit)
17463 30 : ereport(ERROR,
17464 : errcode(ERRCODE_DATATYPE_MISMATCH),
17465 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17466 : parent_attname, RelationGetRelationName(child_rel)));
17467 : }
17468 :
17469 : /*
17470 : * Child column must be generated if and only if parent column is.
17471 : */
17472 6482 : if (parent_att->attgenerated && !child_att->attgenerated)
17473 36 : ereport(ERROR,
17474 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17475 : errmsg("column \"%s\" in child table must be a generated column", parent_attname)));
17476 6446 : if (child_att->attgenerated && !parent_att->attgenerated)
17477 24 : ereport(ERROR,
17478 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17479 : errmsg("column \"%s\" in child table must not be a generated column", parent_attname)));
17480 :
17481 6422 : if (parent_att->attgenerated && child_att->attgenerated && child_att->attgenerated != parent_att->attgenerated)
17482 12 : ereport(ERROR,
17483 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17484 : errmsg("column \"%s\" inherits from generated column of different kind", parent_attname),
17485 : errdetail("Parent column is %s, child column is %s.",
17486 : parent_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL",
17487 : child_att->attgenerated == ATTRIBUTE_GENERATED_STORED ? "STORED" : "VIRTUAL")));
17488 :
17489 : /*
17490 : * Regular inheritance children are independent enough not to
17491 : * inherit identity columns. But partitions are integral part of
17492 : * a partitioned table and inherit identity column.
17493 : */
17494 6410 : if (ispartition)
17495 5716 : child_att->attidentity = parent_att->attidentity;
17496 :
17497 : /*
17498 : * OK, bump the child column's inheritance count. (If we fail
17499 : * later on, this change will just roll back.)
17500 : */
17501 6410 : if (pg_add_s16_overflow(child_att->attinhcount, 1,
17502 : &child_att->attinhcount))
17503 0 : ereport(ERROR,
17504 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17505 : errmsg("too many inheritance parents"));
17506 :
17507 : /*
17508 : * In case of partitions, we must enforce that value of attislocal
17509 : * is same in all partitions. (Note: there are only inherited
17510 : * attributes in partitions)
17511 : */
17512 6410 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17513 : {
17514 : Assert(child_att->attinhcount == 1);
17515 5716 : child_att->attislocal = false;
17516 : }
17517 :
17518 6410 : CatalogTupleUpdate(attrrel, &tuple->t_self, tuple);
17519 6410 : heap_freetuple(tuple);
17520 : }
17521 : else
17522 : {
17523 12 : ereport(ERROR,
17524 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17525 : errmsg("child table is missing column \"%s\"", parent_attname)));
17526 : }
17527 : }
17528 :
17529 2898 : table_close(attrrel, RowExclusiveLock);
17530 2898 : }
17531 :
17532 : /*
17533 : * Check constraints in child table match up with constraints in parent,
17534 : * and increment their coninhcount.
17535 : *
17536 : * Constraints that are marked ONLY in the parent are ignored.
17537 : *
17538 : * Called by CreateInheritance
17539 : *
17540 : * Currently all constraints in parent must be present in the child. One day we
17541 : * may consider adding new constraints like CREATE TABLE does.
17542 : *
17543 : * XXX This is O(N^2) which may be an issue with tables with hundreds of
17544 : * constraints. As long as tables have more like 10 constraints it shouldn't be
17545 : * a problem though. Even 100 constraints ought not be the end of the world.
17546 : *
17547 : * XXX See MergeWithExistingConstraint too if you change this code.
17548 : */
17549 : static void
17550 2898 : MergeConstraintsIntoExisting(Relation child_rel, Relation parent_rel)
17551 : {
17552 : Relation constraintrel;
17553 : SysScanDesc parent_scan;
17554 : ScanKeyData parent_key;
17555 : HeapTuple parent_tuple;
17556 2898 : Oid parent_relid = RelationGetRelid(parent_rel);
17557 : AttrMap *attmap;
17558 :
17559 2898 : constraintrel = table_open(ConstraintRelationId, RowExclusiveLock);
17560 :
17561 : /* Outer loop scans through the parent's constraint definitions */
17562 2898 : ScanKeyInit(&parent_key,
17563 : Anum_pg_constraint_conrelid,
17564 : BTEqualStrategyNumber, F_OIDEQ,
17565 : ObjectIdGetDatum(parent_relid));
17566 2898 : parent_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17567 : true, NULL, 1, &parent_key);
17568 :
17569 2898 : attmap = build_attrmap_by_name(RelationGetDescr(parent_rel),
17570 : RelationGetDescr(child_rel),
17571 : true);
17572 :
17573 4968 : while (HeapTupleIsValid(parent_tuple = systable_getnext(parent_scan)))
17574 : {
17575 2130 : Form_pg_constraint parent_con = (Form_pg_constraint) GETSTRUCT(parent_tuple);
17576 : SysScanDesc child_scan;
17577 : ScanKeyData child_key;
17578 : HeapTuple child_tuple;
17579 : AttrNumber parent_attno;
17580 2130 : bool found = false;
17581 :
17582 2130 : if (parent_con->contype != CONSTRAINT_CHECK &&
17583 1992 : parent_con->contype != CONSTRAINT_NOTNULL)
17584 994 : continue;
17585 :
17586 : /* if the parent's constraint is marked NO INHERIT, it's not inherited */
17587 1180 : if (parent_con->connoinherit)
17588 44 : continue;
17589 :
17590 1136 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17591 1018 : parent_attno = extractNotNullColumn(parent_tuple);
17592 : else
17593 118 : parent_attno = InvalidAttrNumber;
17594 :
17595 : /* Search for a child constraint matching this one */
17596 1136 : ScanKeyInit(&child_key,
17597 : Anum_pg_constraint_conrelid,
17598 : BTEqualStrategyNumber, F_OIDEQ,
17599 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17600 1136 : child_scan = systable_beginscan(constraintrel, ConstraintRelidTypidNameIndexId,
17601 : true, NULL, 1, &child_key);
17602 :
17603 1734 : while (HeapTupleIsValid(child_tuple = systable_getnext(child_scan)))
17604 : {
17605 1710 : Form_pg_constraint child_con = (Form_pg_constraint) GETSTRUCT(child_tuple);
17606 : HeapTuple child_copy;
17607 :
17608 1710 : if (child_con->contype != parent_con->contype)
17609 284 : continue;
17610 :
17611 : /*
17612 : * CHECK constraint are matched by constraint name, NOT NULL ones
17613 : * by attribute number.
17614 : */
17615 1426 : if (child_con->contype == CONSTRAINT_CHECK)
17616 : {
17617 124 : if (strcmp(NameStr(parent_con->conname),
17618 124 : NameStr(child_con->conname)) != 0)
17619 30 : continue;
17620 : }
17621 1302 : else if (child_con->contype == CONSTRAINT_NOTNULL)
17622 : {
17623 : Form_pg_attribute parent_attr;
17624 : Form_pg_attribute child_attr;
17625 : AttrNumber child_attno;
17626 :
17627 1302 : parent_attr = TupleDescAttr(parent_rel->rd_att, parent_attno - 1);
17628 1302 : child_attno = extractNotNullColumn(child_tuple);
17629 1302 : if (parent_attno != attmap->attnums[child_attno - 1])
17630 284 : continue;
17631 :
17632 1018 : child_attr = TupleDescAttr(child_rel->rd_att, child_attno - 1);
17633 : /* there shouldn't be constraints on dropped columns */
17634 1018 : if (parent_attr->attisdropped || child_attr->attisdropped)
17635 0 : elog(ERROR, "found not-null constraint on dropped columns");
17636 : }
17637 :
17638 1112 : if (child_con->contype == CONSTRAINT_CHECK &&
17639 94 : !constraints_equivalent(parent_tuple, child_tuple, RelationGetDescr(constraintrel)))
17640 6 : ereport(ERROR,
17641 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17642 : errmsg("child table \"%s\" has different definition for check constraint \"%s\"",
17643 : RelationGetRelationName(child_rel), NameStr(parent_con->conname))));
17644 :
17645 : /*
17646 : * If the child constraint is "no inherit" then cannot merge
17647 : */
17648 1106 : if (child_con->connoinherit)
17649 12 : ereport(ERROR,
17650 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17651 : errmsg("constraint \"%s\" conflicts with non-inherited constraint on child table \"%s\"",
17652 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17653 :
17654 : /*
17655 : * If the child constraint is "not valid" then cannot merge with a
17656 : * valid parent constraint
17657 : */
17658 1094 : if (parent_con->convalidated && child_con->conenforced &&
17659 1040 : !child_con->convalidated)
17660 12 : ereport(ERROR,
17661 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17662 : errmsg("constraint \"%s\" conflicts with NOT VALID constraint on child table \"%s\"",
17663 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17664 :
17665 : /*
17666 : * A NOT ENFORCED child constraint cannot be merged with an
17667 : * ENFORCED parent constraint. However, the reverse is allowed,
17668 : * where the child constraint is ENFORCED.
17669 : */
17670 1082 : if (parent_con->conenforced && !child_con->conenforced)
17671 6 : ereport(ERROR,
17672 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
17673 : errmsg("constraint \"%s\" conflicts with NOT ENFORCED constraint on child table \"%s\"",
17674 : NameStr(child_con->conname), RelationGetRelationName(child_rel))));
17675 :
17676 : /*
17677 : * OK, bump the child constraint's inheritance count. (If we fail
17678 : * later on, this change will just roll back.)
17679 : */
17680 1076 : child_copy = heap_copytuple(child_tuple);
17681 1076 : child_con = (Form_pg_constraint) GETSTRUCT(child_copy);
17682 :
17683 1076 : if (pg_add_s16_overflow(child_con->coninhcount, 1,
17684 : &child_con->coninhcount))
17685 0 : ereport(ERROR,
17686 : errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
17687 : errmsg("too many inheritance parents"));
17688 :
17689 : /*
17690 : * In case of partitions, an inherited constraint must be
17691 : * inherited only once since it cannot have multiple parents and
17692 : * it is never considered local.
17693 : */
17694 1076 : if (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
17695 : {
17696 : Assert(child_con->coninhcount == 1);
17697 928 : child_con->conislocal = false;
17698 : }
17699 :
17700 1076 : CatalogTupleUpdate(constraintrel, &child_copy->t_self, child_copy);
17701 1076 : heap_freetuple(child_copy);
17702 :
17703 1076 : found = true;
17704 1076 : break;
17705 : }
17706 :
17707 1100 : systable_endscan(child_scan);
17708 :
17709 1100 : if (!found)
17710 : {
17711 24 : if (parent_con->contype == CONSTRAINT_NOTNULL)
17712 0 : ereport(ERROR,
17713 : errcode(ERRCODE_DATATYPE_MISMATCH),
17714 : errmsg("column \"%s\" in child table \"%s\" must be marked NOT NULL",
17715 : get_attname(parent_relid,
17716 : extractNotNullColumn(parent_tuple),
17717 : false),
17718 : RelationGetRelationName(child_rel)));
17719 :
17720 24 : ereport(ERROR,
17721 : (errcode(ERRCODE_DATATYPE_MISMATCH),
17722 : errmsg("child table is missing constraint \"%s\"",
17723 : NameStr(parent_con->conname))));
17724 : }
17725 : }
17726 :
17727 2838 : systable_endscan(parent_scan);
17728 2838 : table_close(constraintrel, RowExclusiveLock);
17729 2838 : }
17730 :
17731 : /*
17732 : * ALTER TABLE NO INHERIT
17733 : *
17734 : * Return value is the address of the relation that is no longer parent.
17735 : */
17736 : static ObjectAddress
17737 86 : ATExecDropInherit(Relation rel, RangeVar *parent, LOCKMODE lockmode)
17738 : {
17739 : ObjectAddress address;
17740 : Relation parent_rel;
17741 :
17742 86 : if (rel->rd_rel->relispartition)
17743 0 : ereport(ERROR,
17744 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
17745 : errmsg("cannot change inheritance of a partition")));
17746 :
17747 : /*
17748 : * AccessShareLock on the parent is probably enough, seeing that DROP
17749 : * TABLE doesn't lock parent tables at all. We need some lock since we'll
17750 : * be inspecting the parent's schema.
17751 : */
17752 86 : parent_rel = table_openrv(parent, AccessShareLock);
17753 :
17754 : /*
17755 : * We don't bother to check ownership of the parent table --- ownership of
17756 : * the child is presumed enough rights.
17757 : */
17758 :
17759 : /* Off to RemoveInheritance() where most of the work happens */
17760 86 : RemoveInheritance(rel, parent_rel, false);
17761 :
17762 80 : ObjectAddressSet(address, RelationRelationId,
17763 : RelationGetRelid(parent_rel));
17764 :
17765 : /* keep our lock on the parent relation until commit */
17766 80 : table_close(parent_rel, NoLock);
17767 :
17768 80 : return address;
17769 : }
17770 :
17771 : /*
17772 : * MarkInheritDetached
17773 : *
17774 : * Set inhdetachpending for a partition, for ATExecDetachPartition
17775 : * in concurrent mode. While at it, verify that no other partition is
17776 : * already pending detach.
17777 : */
17778 : static void
17779 146 : MarkInheritDetached(Relation child_rel, Relation parent_rel)
17780 : {
17781 : Relation catalogRelation;
17782 : SysScanDesc scan;
17783 : ScanKeyData key;
17784 : HeapTuple inheritsTuple;
17785 146 : bool found = false;
17786 :
17787 : Assert(parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
17788 :
17789 : /*
17790 : * Find pg_inherits entries by inhparent. (We need to scan them all in
17791 : * order to verify that no other partition is pending detach.)
17792 : */
17793 146 : catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);
17794 146 : ScanKeyInit(&key,
17795 : Anum_pg_inherits_inhparent,
17796 : BTEqualStrategyNumber, F_OIDEQ,
17797 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
17798 146 : scan = systable_beginscan(catalogRelation, InheritsParentIndexId,
17799 : true, NULL, 1, &key);
17800 :
17801 430 : while (HeapTupleIsValid(inheritsTuple = systable_getnext(scan)))
17802 : {
17803 : Form_pg_inherits inhForm;
17804 :
17805 286 : inhForm = (Form_pg_inherits) GETSTRUCT(inheritsTuple);
17806 286 : if (inhForm->inhdetachpending)
17807 2 : ereport(ERROR,
17808 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
17809 : errmsg("partition \"%s\" already pending detach in partitioned table \"%s.%s\"",
17810 : get_rel_name(inhForm->inhrelid),
17811 : get_namespace_name(parent_rel->rd_rel->relnamespace),
17812 : RelationGetRelationName(parent_rel)),
17813 : errhint("Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the pending detach operation."));
17814 :
17815 284 : if (inhForm->inhrelid == RelationGetRelid(child_rel))
17816 : {
17817 : HeapTuple newtup;
17818 :
17819 144 : newtup = heap_copytuple(inheritsTuple);
17820 144 : ((Form_pg_inherits) GETSTRUCT(newtup))->inhdetachpending = true;
17821 :
17822 144 : CatalogTupleUpdate(catalogRelation,
17823 : &inheritsTuple->t_self,
17824 : newtup);
17825 144 : found = true;
17826 144 : heap_freetuple(newtup);
17827 : /* keep looking, to ensure we catch others pending detach */
17828 : }
17829 : }
17830 :
17831 : /* Done */
17832 144 : systable_endscan(scan);
17833 144 : table_close(catalogRelation, RowExclusiveLock);
17834 :
17835 144 : if (!found)
17836 0 : ereport(ERROR,
17837 : (errcode(ERRCODE_UNDEFINED_TABLE),
17838 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
17839 : RelationGetRelationName(child_rel),
17840 : RelationGetRelationName(parent_rel))));
17841 144 : }
17842 :
17843 : /*
17844 : * RemoveInheritance
17845 : *
17846 : * Drop a parent from the child's parents. This just adjusts the attinhcount
17847 : * and attislocal of the columns and removes the pg_inherit and pg_depend
17848 : * entries. expect_detached is passed down to DeleteInheritsTuple, q.v..
17849 : *
17850 : * If attinhcount goes to 0 then attislocal gets set to true. If it goes back
17851 : * up attislocal stays true, which means if a child is ever removed from a
17852 : * parent then its columns will never be automatically dropped which may
17853 : * surprise. But at least we'll never surprise by dropping columns someone
17854 : * isn't expecting to be dropped which would actually mean data loss.
17855 : *
17856 : * coninhcount and conislocal for inherited constraints are adjusted in
17857 : * exactly the same way.
17858 : *
17859 : * Common to ATExecDropInherit() and ATExecDetachPartition().
17860 : */
17861 : static void
17862 590 : RemoveInheritance(Relation child_rel, Relation parent_rel, bool expect_detached)
17863 : {
17864 : Relation catalogRelation;
17865 : SysScanDesc scan;
17866 : ScanKeyData key[3];
17867 : HeapTuple attributeTuple,
17868 : constraintTuple;
17869 : AttrMap *attmap;
17870 : List *connames;
17871 : List *nncolumns;
17872 : bool found;
17873 : bool is_partitioning;
17874 :
17875 590 : is_partitioning = (parent_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
17876 :
17877 590 : found = DeleteInheritsTuple(RelationGetRelid(child_rel),
17878 : RelationGetRelid(parent_rel),
17879 : expect_detached,
17880 590 : RelationGetRelationName(child_rel));
17881 590 : if (!found)
17882 : {
17883 24 : if (is_partitioning)
17884 18 : ereport(ERROR,
17885 : (errcode(ERRCODE_UNDEFINED_TABLE),
17886 : errmsg("relation \"%s\" is not a partition of relation \"%s\"",
17887 : RelationGetRelationName(child_rel),
17888 : RelationGetRelationName(parent_rel))));
17889 : else
17890 6 : ereport(ERROR,
17891 : (errcode(ERRCODE_UNDEFINED_TABLE),
17892 : errmsg("relation \"%s\" is not a parent of relation \"%s\"",
17893 : RelationGetRelationName(parent_rel),
17894 : RelationGetRelationName(child_rel))));
17895 : }
17896 :
17897 : /*
17898 : * Search through child columns looking for ones matching parent rel
17899 : */
17900 566 : catalogRelation = table_open(AttributeRelationId, RowExclusiveLock);
17901 566 : ScanKeyInit(&key[0],
17902 : Anum_pg_attribute_attrelid,
17903 : BTEqualStrategyNumber, F_OIDEQ,
17904 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17905 566 : scan = systable_beginscan(catalogRelation, AttributeRelidNumIndexId,
17906 : true, NULL, 1, key);
17907 5054 : while (HeapTupleIsValid(attributeTuple = systable_getnext(scan)))
17908 : {
17909 4488 : Form_pg_attribute att = (Form_pg_attribute) GETSTRUCT(attributeTuple);
17910 :
17911 : /* Ignore if dropped or not inherited */
17912 4488 : if (att->attisdropped)
17913 6 : continue;
17914 4482 : if (att->attinhcount <= 0)
17915 3426 : continue;
17916 :
17917 1056 : if (SearchSysCacheExistsAttName(RelationGetRelid(parent_rel),
17918 1056 : NameStr(att->attname)))
17919 : {
17920 : /* Decrement inhcount and possibly set islocal to true */
17921 1002 : HeapTuple copyTuple = heap_copytuple(attributeTuple);
17922 1002 : Form_pg_attribute copy_att = (Form_pg_attribute) GETSTRUCT(copyTuple);
17923 :
17924 1002 : copy_att->attinhcount--;
17925 1002 : if (copy_att->attinhcount == 0)
17926 972 : copy_att->attislocal = true;
17927 :
17928 1002 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
17929 1002 : heap_freetuple(copyTuple);
17930 : }
17931 : }
17932 566 : systable_endscan(scan);
17933 566 : table_close(catalogRelation, RowExclusiveLock);
17934 :
17935 : /*
17936 : * Likewise, find inherited check and not-null constraints and disinherit
17937 : * them. To do this, we first need a list of the names of the parent's
17938 : * check constraints. (We cheat a bit by only checking for name matches,
17939 : * assuming that the expressions will match.)
17940 : *
17941 : * For NOT NULL columns, we store column numbers to match, mapping them in
17942 : * to the child rel's attribute numbers.
17943 : */
17944 566 : attmap = build_attrmap_by_name(RelationGetDescr(child_rel),
17945 : RelationGetDescr(parent_rel),
17946 : false);
17947 :
17948 566 : catalogRelation = table_open(ConstraintRelationId, RowExclusiveLock);
17949 566 : ScanKeyInit(&key[0],
17950 : Anum_pg_constraint_conrelid,
17951 : BTEqualStrategyNumber, F_OIDEQ,
17952 : ObjectIdGetDatum(RelationGetRelid(parent_rel)));
17953 566 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
17954 : true, NULL, 1, key);
17955 :
17956 566 : connames = NIL;
17957 566 : nncolumns = NIL;
17958 :
17959 1220 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
17960 : {
17961 654 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
17962 :
17963 654 : if (con->connoinherit)
17964 110 : continue;
17965 :
17966 544 : if (con->contype == CONSTRAINT_CHECK)
17967 12 : connames = lappend(connames, pstrdup(NameStr(con->conname)));
17968 544 : if (con->contype == CONSTRAINT_NOTNULL)
17969 : {
17970 208 : AttrNumber parent_attno = extractNotNullColumn(constraintTuple);
17971 :
17972 208 : nncolumns = lappend_int(nncolumns, attmap->attnums[parent_attno - 1]);
17973 : }
17974 : }
17975 :
17976 566 : systable_endscan(scan);
17977 :
17978 : /* Now scan the child's constraints to find matches */
17979 566 : ScanKeyInit(&key[0],
17980 : Anum_pg_constraint_conrelid,
17981 : BTEqualStrategyNumber, F_OIDEQ,
17982 : ObjectIdGetDatum(RelationGetRelid(child_rel)));
17983 566 : scan = systable_beginscan(catalogRelation, ConstraintRelidTypidNameIndexId,
17984 : true, NULL, 1, key);
17985 :
17986 1320 : while (HeapTupleIsValid(constraintTuple = systable_getnext(scan)))
17987 : {
17988 754 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(constraintTuple);
17989 754 : bool match = false;
17990 :
17991 : /*
17992 : * Match CHECK constraints by name, not-null constraints by column
17993 : * number, and ignore all others.
17994 : */
17995 754 : if (con->contype == CONSTRAINT_CHECK)
17996 : {
17997 350 : foreach_ptr(char, chkname, connames)
17998 : {
17999 18 : if (con->contype == CONSTRAINT_CHECK &&
18000 18 : strcmp(NameStr(con->conname), chkname) == 0)
18001 : {
18002 12 : match = true;
18003 12 : connames = foreach_delete_current(connames, chkname);
18004 12 : break;
18005 : }
18006 : }
18007 : }
18008 582 : else if (con->contype == CONSTRAINT_NOTNULL)
18009 : {
18010 268 : AttrNumber child_attno = extractNotNullColumn(constraintTuple);
18011 :
18012 542 : foreach_int(prevattno, nncolumns)
18013 : {
18014 214 : if (prevattno == child_attno)
18015 : {
18016 208 : match = true;
18017 208 : nncolumns = foreach_delete_current(nncolumns, prevattno);
18018 208 : break;
18019 : }
18020 : }
18021 : }
18022 : else
18023 314 : continue;
18024 :
18025 440 : if (match)
18026 : {
18027 : /* Decrement inhcount and possibly set islocal to true */
18028 220 : HeapTuple copyTuple = heap_copytuple(constraintTuple);
18029 220 : Form_pg_constraint copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
18030 :
18031 220 : if (copy_con->coninhcount <= 0) /* shouldn't happen */
18032 0 : elog(ERROR, "relation %u has non-inherited constraint \"%s\"",
18033 : RelationGetRelid(child_rel), NameStr(copy_con->conname));
18034 :
18035 220 : copy_con->coninhcount--;
18036 220 : if (copy_con->coninhcount == 0)
18037 202 : copy_con->conislocal = true;
18038 :
18039 220 : CatalogTupleUpdate(catalogRelation, ©Tuple->t_self, copyTuple);
18040 220 : heap_freetuple(copyTuple);
18041 : }
18042 : }
18043 :
18044 : /* We should have matched all constraints */
18045 566 : if (connames != NIL || nncolumns != NIL)
18046 0 : elog(ERROR, "%d unmatched constraints while removing inheritance from \"%s\" to \"%s\"",
18047 : list_length(connames) + list_length(nncolumns),
18048 : RelationGetRelationName(child_rel), RelationGetRelationName(parent_rel));
18049 :
18050 566 : systable_endscan(scan);
18051 566 : table_close(catalogRelation, RowExclusiveLock);
18052 :
18053 566 : drop_parent_dependency(RelationGetRelid(child_rel),
18054 : RelationRelationId,
18055 : RelationGetRelid(parent_rel),
18056 : child_dependency_type(is_partitioning));
18057 :
18058 : /*
18059 : * Post alter hook of this inherits. Since object_access_hook doesn't take
18060 : * multiple object identifiers, we relay oid of parent relation using
18061 : * auxiliary_id argument.
18062 : */
18063 566 : InvokeObjectPostAlterHookArg(InheritsRelationId,
18064 : RelationGetRelid(child_rel), 0,
18065 : RelationGetRelid(parent_rel), false);
18066 566 : }
18067 :
18068 : /*
18069 : * Drop the dependency created by StoreCatalogInheritance1 (CREATE TABLE
18070 : * INHERITS/ALTER TABLE INHERIT -- refclassid will be RelationRelationId) or
18071 : * heap_create_with_catalog (CREATE TABLE OF/ALTER TABLE OF -- refclassid will
18072 : * be TypeRelationId). There's no convenient way to do this, so go trawling
18073 : * through pg_depend.
18074 : */
18075 : static void
18076 578 : drop_parent_dependency(Oid relid, Oid refclassid, Oid refobjid,
18077 : DependencyType deptype)
18078 : {
18079 : Relation catalogRelation;
18080 : SysScanDesc scan;
18081 : ScanKeyData key[3];
18082 : HeapTuple depTuple;
18083 :
18084 578 : catalogRelation = table_open(DependRelationId, RowExclusiveLock);
18085 :
18086 578 : ScanKeyInit(&key[0],
18087 : Anum_pg_depend_classid,
18088 : BTEqualStrategyNumber, F_OIDEQ,
18089 : ObjectIdGetDatum(RelationRelationId));
18090 578 : ScanKeyInit(&key[1],
18091 : Anum_pg_depend_objid,
18092 : BTEqualStrategyNumber, F_OIDEQ,
18093 : ObjectIdGetDatum(relid));
18094 578 : ScanKeyInit(&key[2],
18095 : Anum_pg_depend_objsubid,
18096 : BTEqualStrategyNumber, F_INT4EQ,
18097 : Int32GetDatum(0));
18098 :
18099 578 : scan = systable_beginscan(catalogRelation, DependDependerIndexId, true,
18100 : NULL, 3, key);
18101 :
18102 1794 : while (HeapTupleIsValid(depTuple = systable_getnext(scan)))
18103 : {
18104 1216 : Form_pg_depend dep = (Form_pg_depend) GETSTRUCT(depTuple);
18105 :
18106 1216 : if (dep->refclassid == refclassid &&
18107 620 : dep->refobjid == refobjid &&
18108 578 : dep->refobjsubid == 0 &&
18109 578 : dep->deptype == deptype)
18110 578 : CatalogTupleDelete(catalogRelation, &depTuple->t_self);
18111 : }
18112 :
18113 578 : systable_endscan(scan);
18114 578 : table_close(catalogRelation, RowExclusiveLock);
18115 578 : }
18116 :
18117 : /*
18118 : * ALTER TABLE OF
18119 : *
18120 : * Attach a table to a composite type, as though it had been created with CREATE
18121 : * TABLE OF. All attname, atttypid, atttypmod and attcollation must match. The
18122 : * subject table must not have inheritance parents. These restrictions ensure
18123 : * that you cannot create a configuration impossible with CREATE TABLE OF alone.
18124 : *
18125 : * The address of the type is returned.
18126 : */
18127 : static ObjectAddress
18128 66 : ATExecAddOf(Relation rel, const TypeName *ofTypename, LOCKMODE lockmode)
18129 : {
18130 66 : Oid relid = RelationGetRelid(rel);
18131 : Type typetuple;
18132 : Form_pg_type typeform;
18133 : Oid typeid;
18134 : Relation inheritsRelation,
18135 : relationRelation;
18136 : SysScanDesc scan;
18137 : ScanKeyData key;
18138 : AttrNumber table_attno,
18139 : type_attno;
18140 : TupleDesc typeTupleDesc,
18141 : tableTupleDesc;
18142 : ObjectAddress tableobj,
18143 : typeobj;
18144 : HeapTuple classtuple;
18145 :
18146 : /* Validate the type. */
18147 66 : typetuple = typenameType(NULL, ofTypename, NULL);
18148 66 : check_of_type(typetuple);
18149 66 : typeform = (Form_pg_type) GETSTRUCT(typetuple);
18150 66 : typeid = typeform->oid;
18151 :
18152 : /* Fail if the table has any inheritance parents. */
18153 66 : inheritsRelation = table_open(InheritsRelationId, AccessShareLock);
18154 66 : ScanKeyInit(&key,
18155 : Anum_pg_inherits_inhrelid,
18156 : BTEqualStrategyNumber, F_OIDEQ,
18157 : ObjectIdGetDatum(relid));
18158 66 : scan = systable_beginscan(inheritsRelation, InheritsRelidSeqnoIndexId,
18159 : true, NULL, 1, &key);
18160 66 : if (HeapTupleIsValid(systable_getnext(scan)))
18161 6 : ereport(ERROR,
18162 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18163 : errmsg("typed tables cannot inherit")));
18164 60 : systable_endscan(scan);
18165 60 : table_close(inheritsRelation, AccessShareLock);
18166 :
18167 : /*
18168 : * Check the tuple descriptors for compatibility. Unlike inheritance, we
18169 : * require that the order also match. However, attnotnull need not match.
18170 : */
18171 60 : typeTupleDesc = lookup_rowtype_tupdesc(typeid, -1);
18172 60 : tableTupleDesc = RelationGetDescr(rel);
18173 60 : table_attno = 1;
18174 190 : for (type_attno = 1; type_attno <= typeTupleDesc->natts; type_attno++)
18175 : {
18176 : Form_pg_attribute type_attr,
18177 : table_attr;
18178 : const char *type_attname,
18179 : *table_attname;
18180 :
18181 : /* Get the next non-dropped type attribute. */
18182 154 : type_attr = TupleDescAttr(typeTupleDesc, type_attno - 1);
18183 154 : if (type_attr->attisdropped)
18184 44 : continue;
18185 110 : type_attname = NameStr(type_attr->attname);
18186 :
18187 : /* Get the next non-dropped table attribute. */
18188 : do
18189 : {
18190 122 : if (table_attno > tableTupleDesc->natts)
18191 6 : ereport(ERROR,
18192 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18193 : errmsg("table is missing column \"%s\"",
18194 : type_attname)));
18195 116 : table_attr = TupleDescAttr(tableTupleDesc, table_attno - 1);
18196 116 : table_attno++;
18197 116 : } while (table_attr->attisdropped);
18198 104 : table_attname = NameStr(table_attr->attname);
18199 :
18200 : /* Compare name. */
18201 104 : if (strncmp(table_attname, type_attname, NAMEDATALEN) != 0)
18202 6 : ereport(ERROR,
18203 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18204 : errmsg("table has column \"%s\" where type requires \"%s\"",
18205 : table_attname, type_attname)));
18206 :
18207 : /* Compare type. */
18208 98 : if (table_attr->atttypid != type_attr->atttypid ||
18209 92 : table_attr->atttypmod != type_attr->atttypmod ||
18210 86 : table_attr->attcollation != type_attr->attcollation)
18211 12 : ereport(ERROR,
18212 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18213 : errmsg("table \"%s\" has different type for column \"%s\"",
18214 : RelationGetRelationName(rel), type_attname)));
18215 : }
18216 36 : ReleaseTupleDesc(typeTupleDesc);
18217 :
18218 : /* Any remaining columns at the end of the table had better be dropped. */
18219 36 : for (; table_attno <= tableTupleDesc->natts; table_attno++)
18220 : {
18221 6 : Form_pg_attribute table_attr = TupleDescAttr(tableTupleDesc,
18222 : table_attno - 1);
18223 :
18224 6 : if (!table_attr->attisdropped)
18225 6 : ereport(ERROR,
18226 : (errcode(ERRCODE_DATATYPE_MISMATCH),
18227 : errmsg("table has extra column \"%s\"",
18228 : NameStr(table_attr->attname))));
18229 : }
18230 :
18231 : /* If the table was already typed, drop the existing dependency. */
18232 30 : if (rel->rd_rel->reloftype)
18233 6 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18234 : DEPENDENCY_NORMAL);
18235 :
18236 : /* Record a dependency on the new type. */
18237 30 : tableobj.classId = RelationRelationId;
18238 30 : tableobj.objectId = relid;
18239 30 : tableobj.objectSubId = 0;
18240 30 : typeobj.classId = TypeRelationId;
18241 30 : typeobj.objectId = typeid;
18242 30 : typeobj.objectSubId = 0;
18243 30 : recordDependencyOn(&tableobj, &typeobj, DEPENDENCY_NORMAL);
18244 :
18245 : /* Update pg_class.reloftype */
18246 30 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18247 30 : classtuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18248 30 : if (!HeapTupleIsValid(classtuple))
18249 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18250 30 : ((Form_pg_class) GETSTRUCT(classtuple))->reloftype = typeid;
18251 30 : CatalogTupleUpdate(relationRelation, &classtuple->t_self, classtuple);
18252 :
18253 30 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18254 :
18255 30 : heap_freetuple(classtuple);
18256 30 : table_close(relationRelation, RowExclusiveLock);
18257 :
18258 30 : ReleaseSysCache(typetuple);
18259 :
18260 30 : return typeobj;
18261 : }
18262 :
18263 : /*
18264 : * ALTER TABLE NOT OF
18265 : *
18266 : * Detach a typed table from its originating type. Just clear reloftype and
18267 : * remove the dependency.
18268 : */
18269 : static void
18270 6 : ATExecDropOf(Relation rel, LOCKMODE lockmode)
18271 : {
18272 6 : Oid relid = RelationGetRelid(rel);
18273 : Relation relationRelation;
18274 : HeapTuple tuple;
18275 :
18276 6 : if (!OidIsValid(rel->rd_rel->reloftype))
18277 0 : ereport(ERROR,
18278 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18279 : errmsg("\"%s\" is not a typed table",
18280 : RelationGetRelationName(rel))));
18281 :
18282 : /*
18283 : * We don't bother to check ownership of the type --- ownership of the
18284 : * table is presumed enough rights. No lock required on the type, either.
18285 : */
18286 :
18287 6 : drop_parent_dependency(relid, TypeRelationId, rel->rd_rel->reloftype,
18288 : DEPENDENCY_NORMAL);
18289 :
18290 : /* Clear pg_class.reloftype */
18291 6 : relationRelation = table_open(RelationRelationId, RowExclusiveLock);
18292 6 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18293 6 : if (!HeapTupleIsValid(tuple))
18294 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18295 6 : ((Form_pg_class) GETSTRUCT(tuple))->reloftype = InvalidOid;
18296 6 : CatalogTupleUpdate(relationRelation, &tuple->t_self, tuple);
18297 :
18298 6 : InvokeObjectPostAlterHook(RelationRelationId, relid, 0);
18299 :
18300 6 : heap_freetuple(tuple);
18301 6 : table_close(relationRelation, RowExclusiveLock);
18302 6 : }
18303 :
18304 : /*
18305 : * relation_mark_replica_identity: Update a table's replica identity
18306 : *
18307 : * Iff ri_type = REPLICA_IDENTITY_INDEX, indexOid must be the Oid of a suitable
18308 : * index. Otherwise, it must be InvalidOid.
18309 : *
18310 : * Caller had better hold an exclusive lock on the relation, as the results
18311 : * of running two of these concurrently wouldn't be pretty.
18312 : */
18313 : static void
18314 460 : relation_mark_replica_identity(Relation rel, char ri_type, Oid indexOid,
18315 : bool is_internal)
18316 : {
18317 : Relation pg_index;
18318 : Relation pg_class;
18319 : HeapTuple pg_class_tuple;
18320 : HeapTuple pg_index_tuple;
18321 : Form_pg_class pg_class_form;
18322 : Form_pg_index pg_index_form;
18323 : ListCell *index;
18324 :
18325 : /*
18326 : * Check whether relreplident has changed, and update it if so.
18327 : */
18328 460 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18329 460 : pg_class_tuple = SearchSysCacheCopy1(RELOID,
18330 : ObjectIdGetDatum(RelationGetRelid(rel)));
18331 460 : if (!HeapTupleIsValid(pg_class_tuple))
18332 0 : elog(ERROR, "cache lookup failed for relation \"%s\"",
18333 : RelationGetRelationName(rel));
18334 460 : pg_class_form = (Form_pg_class) GETSTRUCT(pg_class_tuple);
18335 460 : if (pg_class_form->relreplident != ri_type)
18336 : {
18337 410 : pg_class_form->relreplident = ri_type;
18338 410 : CatalogTupleUpdate(pg_class, &pg_class_tuple->t_self, pg_class_tuple);
18339 : }
18340 460 : table_close(pg_class, RowExclusiveLock);
18341 460 : heap_freetuple(pg_class_tuple);
18342 :
18343 : /*
18344 : * Update the per-index indisreplident flags correctly.
18345 : */
18346 460 : pg_index = table_open(IndexRelationId, RowExclusiveLock);
18347 1180 : foreach(index, RelationGetIndexList(rel))
18348 : {
18349 720 : Oid thisIndexOid = lfirst_oid(index);
18350 720 : bool dirty = false;
18351 :
18352 720 : pg_index_tuple = SearchSysCacheCopy1(INDEXRELID,
18353 : ObjectIdGetDatum(thisIndexOid));
18354 720 : if (!HeapTupleIsValid(pg_index_tuple))
18355 0 : elog(ERROR, "cache lookup failed for index %u", thisIndexOid);
18356 720 : pg_index_form = (Form_pg_index) GETSTRUCT(pg_index_tuple);
18357 :
18358 720 : if (thisIndexOid == indexOid)
18359 : {
18360 : /* Set the bit if not already set. */
18361 240 : if (!pg_index_form->indisreplident)
18362 : {
18363 222 : dirty = true;
18364 222 : pg_index_form->indisreplident = true;
18365 : }
18366 : }
18367 : else
18368 : {
18369 : /* Unset the bit if set. */
18370 480 : if (pg_index_form->indisreplident)
18371 : {
18372 52 : dirty = true;
18373 52 : pg_index_form->indisreplident = false;
18374 : }
18375 : }
18376 :
18377 720 : if (dirty)
18378 : {
18379 274 : CatalogTupleUpdate(pg_index, &pg_index_tuple->t_self, pg_index_tuple);
18380 274 : InvokeObjectPostAlterHookArg(IndexRelationId, thisIndexOid, 0,
18381 : InvalidOid, is_internal);
18382 :
18383 : /*
18384 : * Invalidate the relcache for the table, so that after we commit
18385 : * all sessions will refresh the table's replica identity index
18386 : * before attempting any UPDATE or DELETE on the table. (If we
18387 : * changed the table's pg_class row above, then a relcache inval
18388 : * is already queued due to that; but we might not have.)
18389 : */
18390 274 : CacheInvalidateRelcache(rel);
18391 : }
18392 720 : heap_freetuple(pg_index_tuple);
18393 : }
18394 :
18395 460 : table_close(pg_index, RowExclusiveLock);
18396 460 : }
18397 :
18398 : /*
18399 : * ALTER TABLE <name> REPLICA IDENTITY ...
18400 : */
18401 : static void
18402 508 : ATExecReplicaIdentity(Relation rel, ReplicaIdentityStmt *stmt, LOCKMODE lockmode)
18403 : {
18404 : Oid indexOid;
18405 : Relation indexRel;
18406 : int key;
18407 :
18408 508 : if (stmt->identity_type == REPLICA_IDENTITY_DEFAULT)
18409 : {
18410 6 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18411 6 : return;
18412 : }
18413 502 : else if (stmt->identity_type == REPLICA_IDENTITY_FULL)
18414 : {
18415 166 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18416 166 : return;
18417 : }
18418 336 : else if (stmt->identity_type == REPLICA_IDENTITY_NOTHING)
18419 : {
18420 48 : relation_mark_replica_identity(rel, stmt->identity_type, InvalidOid, true);
18421 48 : return;
18422 : }
18423 288 : else if (stmt->identity_type == REPLICA_IDENTITY_INDEX)
18424 : {
18425 : /* fallthrough */ ;
18426 : }
18427 : else
18428 0 : elog(ERROR, "unexpected identity type %u", stmt->identity_type);
18429 :
18430 : /* Check that the index exists */
18431 288 : indexOid = get_relname_relid(stmt->name, rel->rd_rel->relnamespace);
18432 288 : if (!OidIsValid(indexOid))
18433 0 : ereport(ERROR,
18434 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18435 : errmsg("index \"%s\" for table \"%s\" does not exist",
18436 : stmt->name, RelationGetRelationName(rel))));
18437 :
18438 288 : indexRel = index_open(indexOid, ShareLock);
18439 :
18440 : /* Check that the index is on the relation we're altering. */
18441 288 : if (indexRel->rd_index == NULL ||
18442 288 : indexRel->rd_index->indrelid != RelationGetRelid(rel))
18443 6 : ereport(ERROR,
18444 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18445 : errmsg("\"%s\" is not an index for table \"%s\"",
18446 : RelationGetRelationName(indexRel),
18447 : RelationGetRelationName(rel))));
18448 :
18449 : /*
18450 : * The AM must support uniqueness, and the index must in fact be unique.
18451 : * If we have a WITHOUT OVERLAPS constraint (identified by uniqueness +
18452 : * exclusion), we can use that too.
18453 : */
18454 282 : if ((!indexRel->rd_indam->amcanunique ||
18455 262 : !indexRel->rd_index->indisunique) &&
18456 26 : !(indexRel->rd_index->indisunique && indexRel->rd_index->indisexclusion))
18457 12 : ereport(ERROR,
18458 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18459 : errmsg("cannot use non-unique index \"%s\" as replica identity",
18460 : RelationGetRelationName(indexRel))));
18461 : /* Deferred indexes are not guaranteed to be always unique. */
18462 270 : if (!indexRel->rd_index->indimmediate)
18463 12 : ereport(ERROR,
18464 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18465 : errmsg("cannot use non-immediate index \"%s\" as replica identity",
18466 : RelationGetRelationName(indexRel))));
18467 : /* Expression indexes aren't supported. */
18468 258 : if (RelationGetIndexExpressions(indexRel) != NIL)
18469 6 : ereport(ERROR,
18470 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18471 : errmsg("cannot use expression index \"%s\" as replica identity",
18472 : RelationGetRelationName(indexRel))));
18473 : /* Predicate indexes aren't supported. */
18474 252 : if (RelationGetIndexPredicate(indexRel) != NIL)
18475 6 : ereport(ERROR,
18476 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18477 : errmsg("cannot use partial index \"%s\" as replica identity",
18478 : RelationGetRelationName(indexRel))));
18479 :
18480 : /* Check index for nullable columns. */
18481 552 : for (key = 0; key < IndexRelationGetNumberOfKeyAttributes(indexRel); key++)
18482 : {
18483 312 : int16 attno = indexRel->rd_index->indkey.values[key];
18484 : Form_pg_attribute attr;
18485 :
18486 : /*
18487 : * Reject any other system columns. (Going forward, we'll disallow
18488 : * indexes containing such columns in the first place, but they might
18489 : * exist in older branches.)
18490 : */
18491 312 : if (attno <= 0)
18492 0 : ereport(ERROR,
18493 : (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
18494 : errmsg("index \"%s\" cannot be used as replica identity because column %d is a system column",
18495 : RelationGetRelationName(indexRel), attno)));
18496 :
18497 312 : attr = TupleDescAttr(rel->rd_att, attno - 1);
18498 312 : if (!attr->attnotnull)
18499 6 : ereport(ERROR,
18500 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
18501 : errmsg("index \"%s\" cannot be used as replica identity because column \"%s\" is nullable",
18502 : RelationGetRelationName(indexRel),
18503 : NameStr(attr->attname))));
18504 : }
18505 :
18506 : /* This index is suitable for use as a replica identity. Mark it. */
18507 240 : relation_mark_replica_identity(rel, stmt->identity_type, indexOid, true);
18508 :
18509 240 : index_close(indexRel, NoLock);
18510 : }
18511 :
18512 : /*
18513 : * ALTER TABLE ENABLE/DISABLE ROW LEVEL SECURITY
18514 : */
18515 : static void
18516 312 : ATExecSetRowSecurity(Relation rel, bool rls)
18517 : {
18518 : Relation pg_class;
18519 : Oid relid;
18520 : HeapTuple tuple;
18521 :
18522 312 : relid = RelationGetRelid(rel);
18523 :
18524 : /* Pull the record for this relation and update it */
18525 312 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18526 :
18527 312 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18528 :
18529 312 : if (!HeapTupleIsValid(tuple))
18530 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18531 :
18532 312 : ((Form_pg_class) GETSTRUCT(tuple))->relrowsecurity = rls;
18533 312 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18534 :
18535 312 : InvokeObjectPostAlterHook(RelationRelationId,
18536 : RelationGetRelid(rel), 0);
18537 :
18538 312 : table_close(pg_class, RowExclusiveLock);
18539 312 : heap_freetuple(tuple);
18540 312 : }
18541 :
18542 : /*
18543 : * ALTER TABLE FORCE/NO FORCE ROW LEVEL SECURITY
18544 : */
18545 : static void
18546 128 : ATExecForceNoForceRowSecurity(Relation rel, bool force_rls)
18547 : {
18548 : Relation pg_class;
18549 : Oid relid;
18550 : HeapTuple tuple;
18551 :
18552 128 : relid = RelationGetRelid(rel);
18553 :
18554 128 : pg_class = table_open(RelationRelationId, RowExclusiveLock);
18555 :
18556 128 : tuple = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relid));
18557 :
18558 128 : if (!HeapTupleIsValid(tuple))
18559 0 : elog(ERROR, "cache lookup failed for relation %u", relid);
18560 :
18561 128 : ((Form_pg_class) GETSTRUCT(tuple))->relforcerowsecurity = force_rls;
18562 128 : CatalogTupleUpdate(pg_class, &tuple->t_self, tuple);
18563 :
18564 128 : InvokeObjectPostAlterHook(RelationRelationId,
18565 : RelationGetRelid(rel), 0);
18566 :
18567 128 : table_close(pg_class, RowExclusiveLock);
18568 128 : heap_freetuple(tuple);
18569 128 : }
18570 :
18571 : /*
18572 : * ALTER FOREIGN TABLE <name> OPTIONS (...)
18573 : */
18574 : static void
18575 58 : ATExecGenericOptions(Relation rel, List *options)
18576 : {
18577 : Relation ftrel;
18578 : ForeignServer *server;
18579 : ForeignDataWrapper *fdw;
18580 : HeapTuple tuple;
18581 : bool isnull;
18582 : Datum repl_val[Natts_pg_foreign_table];
18583 : bool repl_null[Natts_pg_foreign_table];
18584 : bool repl_repl[Natts_pg_foreign_table];
18585 : Datum datum;
18586 : Form_pg_foreign_table tableform;
18587 :
18588 58 : if (options == NIL)
18589 0 : return;
18590 :
18591 58 : ftrel = table_open(ForeignTableRelationId, RowExclusiveLock);
18592 :
18593 58 : tuple = SearchSysCacheCopy1(FOREIGNTABLEREL,
18594 : ObjectIdGetDatum(rel->rd_id));
18595 58 : if (!HeapTupleIsValid(tuple))
18596 0 : ereport(ERROR,
18597 : (errcode(ERRCODE_UNDEFINED_OBJECT),
18598 : errmsg("foreign table \"%s\" does not exist",
18599 : RelationGetRelationName(rel))));
18600 58 : tableform = (Form_pg_foreign_table) GETSTRUCT(tuple);
18601 58 : server = GetForeignServer(tableform->ftserver);
18602 58 : fdw = GetForeignDataWrapper(server->fdwid);
18603 :
18604 58 : memset(repl_val, 0, sizeof(repl_val));
18605 58 : memset(repl_null, false, sizeof(repl_null));
18606 58 : memset(repl_repl, false, sizeof(repl_repl));
18607 :
18608 : /* Extract the current options */
18609 58 : datum = SysCacheGetAttr(FOREIGNTABLEREL,
18610 : tuple,
18611 : Anum_pg_foreign_table_ftoptions,
18612 : &isnull);
18613 58 : if (isnull)
18614 4 : datum = PointerGetDatum(NULL);
18615 :
18616 : /* Transform the options */
18617 58 : datum = transformGenericOptions(ForeignTableRelationId,
18618 : datum,
18619 : options,
18620 : fdw->fdwvalidator);
18621 :
18622 56 : if (PointerIsValid(DatumGetPointer(datum)))
18623 56 : repl_val[Anum_pg_foreign_table_ftoptions - 1] = datum;
18624 : else
18625 0 : repl_null[Anum_pg_foreign_table_ftoptions - 1] = true;
18626 :
18627 56 : repl_repl[Anum_pg_foreign_table_ftoptions - 1] = true;
18628 :
18629 : /* Everything looks good - update the tuple */
18630 :
18631 56 : tuple = heap_modify_tuple(tuple, RelationGetDescr(ftrel),
18632 : repl_val, repl_null, repl_repl);
18633 :
18634 56 : CatalogTupleUpdate(ftrel, &tuple->t_self, tuple);
18635 :
18636 : /*
18637 : * Invalidate relcache so that all sessions will refresh any cached plans
18638 : * that might depend on the old options.
18639 : */
18640 56 : CacheInvalidateRelcache(rel);
18641 :
18642 56 : InvokeObjectPostAlterHook(ForeignTableRelationId,
18643 : RelationGetRelid(rel), 0);
18644 :
18645 56 : table_close(ftrel, RowExclusiveLock);
18646 :
18647 56 : heap_freetuple(tuple);
18648 : }
18649 :
18650 : /*
18651 : * ALTER TABLE ALTER COLUMN SET COMPRESSION
18652 : *
18653 : * Return value is the address of the modified column
18654 : */
18655 : static ObjectAddress
18656 90 : ATExecSetCompression(Relation rel,
18657 : const char *column,
18658 : Node *newValue,
18659 : LOCKMODE lockmode)
18660 : {
18661 : Relation attrel;
18662 : HeapTuple tuple;
18663 : Form_pg_attribute atttableform;
18664 : AttrNumber attnum;
18665 : char *compression;
18666 : char cmethod;
18667 : ObjectAddress address;
18668 :
18669 90 : compression = strVal(newValue);
18670 :
18671 90 : attrel = table_open(AttributeRelationId, RowExclusiveLock);
18672 :
18673 : /* copy the cache entry so we can scribble on it below */
18674 90 : tuple = SearchSysCacheCopyAttName(RelationGetRelid(rel), column);
18675 90 : if (!HeapTupleIsValid(tuple))
18676 0 : ereport(ERROR,
18677 : (errcode(ERRCODE_UNDEFINED_COLUMN),
18678 : errmsg("column \"%s\" of relation \"%s\" does not exist",
18679 : column, RelationGetRelationName(rel))));
18680 :
18681 : /* prevent them from altering a system attribute */
18682 90 : atttableform = (Form_pg_attribute) GETSTRUCT(tuple);
18683 90 : attnum = atttableform->attnum;
18684 90 : if (attnum <= 0)
18685 0 : ereport(ERROR,
18686 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18687 : errmsg("cannot alter system column \"%s\"", column)));
18688 :
18689 : /*
18690 : * Check that column type is compressible, then get the attribute
18691 : * compression method code
18692 : */
18693 90 : cmethod = GetAttributeCompression(atttableform->atttypid, compression);
18694 :
18695 : /* update pg_attribute entry */
18696 84 : atttableform->attcompression = cmethod;
18697 84 : CatalogTupleUpdate(attrel, &tuple->t_self, tuple);
18698 :
18699 84 : InvokeObjectPostAlterHook(RelationRelationId,
18700 : RelationGetRelid(rel),
18701 : attnum);
18702 :
18703 : /*
18704 : * Apply the change to indexes as well (only for simple index columns,
18705 : * matching behavior of index.c ConstructTupleDescriptor()).
18706 : */
18707 84 : SetIndexStorageProperties(rel, attrel, attnum,
18708 : false, 0,
18709 : true, cmethod,
18710 : lockmode);
18711 :
18712 84 : heap_freetuple(tuple);
18713 :
18714 84 : table_close(attrel, RowExclusiveLock);
18715 :
18716 : /* make changes visible */
18717 84 : CommandCounterIncrement();
18718 :
18719 84 : ObjectAddressSubSet(address, RelationRelationId,
18720 : RelationGetRelid(rel), attnum);
18721 84 : return address;
18722 : }
18723 :
18724 :
18725 : /*
18726 : * Preparation phase for SET LOGGED/UNLOGGED
18727 : *
18728 : * This verifies that we're not trying to change a temp table. Also,
18729 : * existing foreign key constraints are checked to avoid ending up with
18730 : * permanent tables referencing unlogged tables.
18731 : */
18732 : static void
18733 100 : ATPrepChangePersistence(AlteredTableInfo *tab, Relation rel, bool toLogged)
18734 : {
18735 : Relation pg_constraint;
18736 : HeapTuple tuple;
18737 : SysScanDesc scan;
18738 : ScanKeyData skey[1];
18739 :
18740 : /*
18741 : * Disallow changing status for a temp table. Also verify whether we can
18742 : * get away with doing nothing; in such cases we don't need to run the
18743 : * checks below, either.
18744 : */
18745 100 : switch (rel->rd_rel->relpersistence)
18746 : {
18747 0 : case RELPERSISTENCE_TEMP:
18748 0 : ereport(ERROR,
18749 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18750 : errmsg("cannot change logged status of table \"%s\" because it is temporary",
18751 : RelationGetRelationName(rel)),
18752 : errtable(rel)));
18753 : break;
18754 56 : case RELPERSISTENCE_PERMANENT:
18755 56 : if (toLogged)
18756 : /* nothing to do */
18757 12 : return;
18758 50 : break;
18759 44 : case RELPERSISTENCE_UNLOGGED:
18760 44 : if (!toLogged)
18761 : /* nothing to do */
18762 6 : return;
18763 38 : break;
18764 : }
18765 :
18766 : /*
18767 : * Check that the table is not part of any publication when changing to
18768 : * UNLOGGED, as UNLOGGED tables can't be published.
18769 : */
18770 138 : if (!toLogged &&
18771 50 : GetRelationPublications(RelationGetRelid(rel)) != NIL)
18772 0 : ereport(ERROR,
18773 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
18774 : errmsg("cannot change table \"%s\" to unlogged because it is part of a publication",
18775 : RelationGetRelationName(rel)),
18776 : errdetail("Unlogged relations cannot be replicated.")));
18777 :
18778 : /*
18779 : * Check existing foreign key constraints to preserve the invariant that
18780 : * permanent tables cannot reference unlogged ones. Self-referencing
18781 : * foreign keys can safely be ignored.
18782 : */
18783 88 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
18784 :
18785 : /*
18786 : * Scan conrelid if changing to permanent, else confrelid. This also
18787 : * determines whether a useful index exists.
18788 : */
18789 88 : ScanKeyInit(&skey[0],
18790 : toLogged ? Anum_pg_constraint_conrelid :
18791 : Anum_pg_constraint_confrelid,
18792 : BTEqualStrategyNumber, F_OIDEQ,
18793 : ObjectIdGetDatum(RelationGetRelid(rel)));
18794 88 : scan = systable_beginscan(pg_constraint,
18795 : toLogged ? ConstraintRelidTypidNameIndexId : InvalidOid,
18796 : true, NULL, 1, skey);
18797 :
18798 142 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
18799 : {
18800 66 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
18801 :
18802 66 : if (con->contype == CONSTRAINT_FOREIGN)
18803 : {
18804 : Oid foreignrelid;
18805 : Relation foreignrel;
18806 :
18807 : /* the opposite end of what we used as scankey */
18808 30 : foreignrelid = toLogged ? con->confrelid : con->conrelid;
18809 :
18810 : /* ignore if self-referencing */
18811 30 : if (RelationGetRelid(rel) == foreignrelid)
18812 12 : continue;
18813 :
18814 18 : foreignrel = relation_open(foreignrelid, AccessShareLock);
18815 :
18816 18 : if (toLogged)
18817 : {
18818 6 : if (!RelationIsPermanent(foreignrel))
18819 6 : ereport(ERROR,
18820 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18821 : errmsg("could not change table \"%s\" to logged because it references unlogged table \"%s\"",
18822 : RelationGetRelationName(rel),
18823 : RelationGetRelationName(foreignrel)),
18824 : errtableconstraint(rel, NameStr(con->conname))));
18825 : }
18826 : else
18827 : {
18828 12 : if (RelationIsPermanent(foreignrel))
18829 6 : ereport(ERROR,
18830 : (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
18831 : errmsg("could not change table \"%s\" to unlogged because it references logged table \"%s\"",
18832 : RelationGetRelationName(rel),
18833 : RelationGetRelationName(foreignrel)),
18834 : errtableconstraint(rel, NameStr(con->conname))));
18835 : }
18836 :
18837 6 : relation_close(foreignrel, AccessShareLock);
18838 : }
18839 : }
18840 :
18841 76 : systable_endscan(scan);
18842 :
18843 76 : table_close(pg_constraint, AccessShareLock);
18844 :
18845 : /* force rewrite if necessary; see comment in ATRewriteTables */
18846 76 : tab->rewrite |= AT_REWRITE_ALTER_PERSISTENCE;
18847 76 : if (toLogged)
18848 32 : tab->newrelpersistence = RELPERSISTENCE_PERMANENT;
18849 : else
18850 44 : tab->newrelpersistence = RELPERSISTENCE_UNLOGGED;
18851 76 : tab->chgPersistence = true;
18852 : }
18853 :
18854 : /*
18855 : * Execute ALTER TABLE SET SCHEMA
18856 : */
18857 : ObjectAddress
18858 104 : AlterTableNamespace(AlterObjectSchemaStmt *stmt, Oid *oldschema)
18859 : {
18860 : Relation rel;
18861 : Oid relid;
18862 : Oid oldNspOid;
18863 : Oid nspOid;
18864 : RangeVar *newrv;
18865 : ObjectAddresses *objsMoved;
18866 : ObjectAddress myself;
18867 :
18868 104 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
18869 104 : stmt->missing_ok ? RVR_MISSING_OK : 0,
18870 : RangeVarCallbackForAlterRelation,
18871 : stmt);
18872 :
18873 102 : if (!OidIsValid(relid))
18874 : {
18875 12 : ereport(NOTICE,
18876 : (errmsg("relation \"%s\" does not exist, skipping",
18877 : stmt->relation->relname)));
18878 12 : return InvalidObjectAddress;
18879 : }
18880 :
18881 90 : rel = relation_open(relid, NoLock);
18882 :
18883 90 : oldNspOid = RelationGetNamespace(rel);
18884 :
18885 : /* If it's an owned sequence, disallow moving it by itself. */
18886 90 : if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
18887 : {
18888 : Oid tableId;
18889 : int32 colId;
18890 :
18891 10 : if (sequenceIsOwned(relid, DEPENDENCY_AUTO, &tableId, &colId) ||
18892 2 : sequenceIsOwned(relid, DEPENDENCY_INTERNAL, &tableId, &colId))
18893 6 : ereport(ERROR,
18894 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
18895 : errmsg("cannot move an owned sequence into another schema"),
18896 : errdetail("Sequence \"%s\" is linked to table \"%s\".",
18897 : RelationGetRelationName(rel),
18898 : get_rel_name(tableId))));
18899 : }
18900 :
18901 : /* Get and lock schema OID and check its permissions. */
18902 84 : newrv = makeRangeVar(stmt->newschema, RelationGetRelationName(rel), -1);
18903 84 : nspOid = RangeVarGetAndCheckCreationNamespace(newrv, NoLock, NULL);
18904 :
18905 : /* common checks on switching namespaces */
18906 84 : CheckSetNamespace(oldNspOid, nspOid);
18907 :
18908 84 : objsMoved = new_object_addresses();
18909 84 : AlterTableNamespaceInternal(rel, oldNspOid, nspOid, objsMoved);
18910 84 : free_object_addresses(objsMoved);
18911 :
18912 84 : ObjectAddressSet(myself, RelationRelationId, relid);
18913 :
18914 84 : if (oldschema)
18915 84 : *oldschema = oldNspOid;
18916 :
18917 : /* close rel, but keep lock until commit */
18918 84 : relation_close(rel, NoLock);
18919 :
18920 84 : return myself;
18921 : }
18922 :
18923 : /*
18924 : * The guts of relocating a table or materialized view to another namespace:
18925 : * besides moving the relation itself, its dependent objects are relocated to
18926 : * the new schema.
18927 : */
18928 : void
18929 86 : AlterTableNamespaceInternal(Relation rel, Oid oldNspOid, Oid nspOid,
18930 : ObjectAddresses *objsMoved)
18931 : {
18932 : Relation classRel;
18933 :
18934 : Assert(objsMoved != NULL);
18935 :
18936 : /* OK, modify the pg_class row and pg_depend entry */
18937 86 : classRel = table_open(RelationRelationId, RowExclusiveLock);
18938 :
18939 86 : AlterRelationNamespaceInternal(classRel, RelationGetRelid(rel), oldNspOid,
18940 : nspOid, true, objsMoved);
18941 :
18942 : /* Fix the table's row type too, if it has one */
18943 86 : if (OidIsValid(rel->rd_rel->reltype))
18944 84 : AlterTypeNamespaceInternal(rel->rd_rel->reltype, nspOid,
18945 : false, /* isImplicitArray */
18946 : false, /* ignoreDependent */
18947 : false, /* errorOnTableType */
18948 : objsMoved);
18949 :
18950 : /* Fix other dependent stuff */
18951 86 : AlterIndexNamespaces(classRel, rel, oldNspOid, nspOid, objsMoved);
18952 86 : AlterSeqNamespaces(classRel, rel, oldNspOid, nspOid,
18953 : objsMoved, AccessExclusiveLock);
18954 86 : AlterConstraintNamespaces(RelationGetRelid(rel), oldNspOid, nspOid,
18955 : false, objsMoved);
18956 :
18957 86 : table_close(classRel, RowExclusiveLock);
18958 86 : }
18959 :
18960 : /*
18961 : * The guts of relocating a relation to another namespace: fix the pg_class
18962 : * entry, and the pg_depend entry if any. Caller must already have
18963 : * opened and write-locked pg_class.
18964 : */
18965 : void
18966 188 : AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
18967 : Oid oldNspOid, Oid newNspOid,
18968 : bool hasDependEntry,
18969 : ObjectAddresses *objsMoved)
18970 : {
18971 : HeapTuple classTup;
18972 : Form_pg_class classForm;
18973 : ObjectAddress thisobj;
18974 188 : bool already_done = false;
18975 :
18976 : /* no rel lock for relkind=c so use LOCKTAG_TUPLE */
18977 188 : classTup = SearchSysCacheLockedCopy1(RELOID, ObjectIdGetDatum(relOid));
18978 188 : if (!HeapTupleIsValid(classTup))
18979 0 : elog(ERROR, "cache lookup failed for relation %u", relOid);
18980 188 : classForm = (Form_pg_class) GETSTRUCT(classTup);
18981 :
18982 : Assert(classForm->relnamespace == oldNspOid);
18983 :
18984 188 : thisobj.classId = RelationRelationId;
18985 188 : thisobj.objectId = relOid;
18986 188 : thisobj.objectSubId = 0;
18987 :
18988 : /*
18989 : * If the object has already been moved, don't move it again. If it's
18990 : * already in the right place, don't move it, but still fire the object
18991 : * access hook.
18992 : */
18993 188 : already_done = object_address_present(&thisobj, objsMoved);
18994 188 : if (!already_done && oldNspOid != newNspOid)
18995 146 : {
18996 146 : ItemPointerData otid = classTup->t_self;
18997 :
18998 : /* check for duplicate name (more friendly than unique-index failure) */
18999 146 : if (get_relname_relid(NameStr(classForm->relname),
19000 : newNspOid) != InvalidOid)
19001 0 : ereport(ERROR,
19002 : (errcode(ERRCODE_DUPLICATE_TABLE),
19003 : errmsg("relation \"%s\" already exists in schema \"%s\"",
19004 : NameStr(classForm->relname),
19005 : get_namespace_name(newNspOid))));
19006 :
19007 : /* classTup is a copy, so OK to scribble on */
19008 146 : classForm->relnamespace = newNspOid;
19009 :
19010 146 : CatalogTupleUpdate(classRel, &otid, classTup);
19011 146 : UnlockTuple(classRel, &otid, InplaceUpdateTupleLock);
19012 :
19013 :
19014 : /* Update dependency on schema if caller said so */
19015 250 : if (hasDependEntry &&
19016 104 : changeDependencyFor(RelationRelationId,
19017 : relOid,
19018 : NamespaceRelationId,
19019 : oldNspOid,
19020 : newNspOid) != 1)
19021 0 : elog(ERROR, "could not change schema dependency for relation \"%s\"",
19022 : NameStr(classForm->relname));
19023 : }
19024 : else
19025 42 : UnlockTuple(classRel, &classTup->t_self, InplaceUpdateTupleLock);
19026 188 : if (!already_done)
19027 : {
19028 188 : add_exact_object_address(&thisobj, objsMoved);
19029 :
19030 188 : InvokeObjectPostAlterHook(RelationRelationId, relOid, 0);
19031 : }
19032 :
19033 188 : heap_freetuple(classTup);
19034 188 : }
19035 :
19036 : /*
19037 : * Move all indexes for the specified relation to another namespace.
19038 : *
19039 : * Note: we assume adequate permission checking was done by the caller,
19040 : * and that the caller has a suitable lock on the owning relation.
19041 : */
19042 : static void
19043 86 : AlterIndexNamespaces(Relation classRel, Relation rel,
19044 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved)
19045 : {
19046 : List *indexList;
19047 : ListCell *l;
19048 :
19049 86 : indexList = RelationGetIndexList(rel);
19050 :
19051 132 : foreach(l, indexList)
19052 : {
19053 46 : Oid indexOid = lfirst_oid(l);
19054 : ObjectAddress thisobj;
19055 :
19056 46 : thisobj.classId = RelationRelationId;
19057 46 : thisobj.objectId = indexOid;
19058 46 : thisobj.objectSubId = 0;
19059 :
19060 : /*
19061 : * Note: currently, the index will not have its own dependency on the
19062 : * namespace, so we don't need to do changeDependencyFor(). There's no
19063 : * row type in pg_type, either.
19064 : *
19065 : * XXX this objsMoved test may be pointless -- surely we have a single
19066 : * dependency link from a relation to each index?
19067 : */
19068 46 : if (!object_address_present(&thisobj, objsMoved))
19069 : {
19070 46 : AlterRelationNamespaceInternal(classRel, indexOid,
19071 : oldNspOid, newNspOid,
19072 : false, objsMoved);
19073 46 : add_exact_object_address(&thisobj, objsMoved);
19074 : }
19075 : }
19076 :
19077 86 : list_free(indexList);
19078 86 : }
19079 :
19080 : /*
19081 : * Move all identity and SERIAL-column sequences of the specified relation to another
19082 : * namespace.
19083 : *
19084 : * Note: we assume adequate permission checking was done by the caller,
19085 : * and that the caller has a suitable lock on the owning relation.
19086 : */
19087 : static void
19088 86 : AlterSeqNamespaces(Relation classRel, Relation rel,
19089 : Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
19090 : LOCKMODE lockmode)
19091 : {
19092 : Relation depRel;
19093 : SysScanDesc scan;
19094 : ScanKeyData key[2];
19095 : HeapTuple tup;
19096 :
19097 : /*
19098 : * SERIAL sequences are those having an auto dependency on one of the
19099 : * table's columns (we don't care *which* column, exactly).
19100 : */
19101 86 : depRel = table_open(DependRelationId, AccessShareLock);
19102 :
19103 86 : ScanKeyInit(&key[0],
19104 : Anum_pg_depend_refclassid,
19105 : BTEqualStrategyNumber, F_OIDEQ,
19106 : ObjectIdGetDatum(RelationRelationId));
19107 86 : ScanKeyInit(&key[1],
19108 : Anum_pg_depend_refobjid,
19109 : BTEqualStrategyNumber, F_OIDEQ,
19110 : ObjectIdGetDatum(RelationGetRelid(rel)));
19111 : /* we leave refobjsubid unspecified */
19112 :
19113 86 : scan = systable_beginscan(depRel, DependReferenceIndexId, true,
19114 : NULL, 2, key);
19115 :
19116 616 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
19117 : {
19118 530 : Form_pg_depend depForm = (Form_pg_depend) GETSTRUCT(tup);
19119 : Relation seqRel;
19120 :
19121 : /* skip dependencies other than auto dependencies on columns */
19122 530 : if (depForm->refobjsubid == 0 ||
19123 382 : depForm->classid != RelationRelationId ||
19124 42 : depForm->objsubid != 0 ||
19125 42 : !(depForm->deptype == DEPENDENCY_AUTO || depForm->deptype == DEPENDENCY_INTERNAL))
19126 488 : continue;
19127 :
19128 : /* Use relation_open just in case it's an index */
19129 42 : seqRel = relation_open(depForm->objid, lockmode);
19130 :
19131 : /* skip non-sequence relations */
19132 42 : if (RelationGetForm(seqRel)->relkind != RELKIND_SEQUENCE)
19133 : {
19134 : /* No need to keep the lock */
19135 0 : relation_close(seqRel, lockmode);
19136 0 : continue;
19137 : }
19138 :
19139 : /* Fix the pg_class and pg_depend entries */
19140 42 : AlterRelationNamespaceInternal(classRel, depForm->objid,
19141 : oldNspOid, newNspOid,
19142 : true, objsMoved);
19143 :
19144 : /*
19145 : * Sequences used to have entries in pg_type, but no longer do. If we
19146 : * ever re-instate that, we'll need to move the pg_type entry to the
19147 : * new namespace, too (using AlterTypeNamespaceInternal).
19148 : */
19149 : Assert(RelationGetForm(seqRel)->reltype == InvalidOid);
19150 :
19151 : /* Now we can close it. Keep the lock till end of transaction. */
19152 42 : relation_close(seqRel, NoLock);
19153 : }
19154 :
19155 86 : systable_endscan(scan);
19156 :
19157 86 : relation_close(depRel, AccessShareLock);
19158 86 : }
19159 :
19160 :
19161 : /*
19162 : * This code supports
19163 : * CREATE TEMP TABLE ... ON COMMIT { DROP | PRESERVE ROWS | DELETE ROWS }
19164 : *
19165 : * Because we only support this for TEMP tables, it's sufficient to remember
19166 : * the state in a backend-local data structure.
19167 : */
19168 :
19169 : /*
19170 : * Register a newly-created relation's ON COMMIT action.
19171 : */
19172 : void
19173 176 : register_on_commit_action(Oid relid, OnCommitAction action)
19174 : {
19175 : OnCommitItem *oc;
19176 : MemoryContext oldcxt;
19177 :
19178 : /*
19179 : * We needn't bother registering the relation unless there is an ON COMMIT
19180 : * action we need to take.
19181 : */
19182 176 : if (action == ONCOMMIT_NOOP || action == ONCOMMIT_PRESERVE_ROWS)
19183 24 : return;
19184 :
19185 152 : oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
19186 :
19187 152 : oc = (OnCommitItem *) palloc(sizeof(OnCommitItem));
19188 152 : oc->relid = relid;
19189 152 : oc->oncommit = action;
19190 152 : oc->creating_subid = GetCurrentSubTransactionId();
19191 152 : oc->deleting_subid = InvalidSubTransactionId;
19192 :
19193 : /*
19194 : * We use lcons() here so that ON COMMIT actions are processed in reverse
19195 : * order of registration. That might not be essential but it seems
19196 : * reasonable.
19197 : */
19198 152 : on_commits = lcons(oc, on_commits);
19199 :
19200 152 : MemoryContextSwitchTo(oldcxt);
19201 : }
19202 :
19203 : /*
19204 : * Unregister any ON COMMIT action when a relation is deleted.
19205 : *
19206 : * Actually, we only mark the OnCommitItem entry as to be deleted after commit.
19207 : */
19208 : void
19209 47796 : remove_on_commit_action(Oid relid)
19210 : {
19211 : ListCell *l;
19212 :
19213 47942 : foreach(l, on_commits)
19214 : {
19215 286 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19216 :
19217 286 : if (oc->relid == relid)
19218 : {
19219 140 : oc->deleting_subid = GetCurrentSubTransactionId();
19220 140 : break;
19221 : }
19222 : }
19223 47796 : }
19224 :
19225 : /*
19226 : * Perform ON COMMIT actions.
19227 : *
19228 : * This is invoked just before actually committing, since it's possible
19229 : * to encounter errors.
19230 : */
19231 : void
19232 799952 : PreCommit_on_commit_actions(void)
19233 : {
19234 : ListCell *l;
19235 799952 : List *oids_to_truncate = NIL;
19236 799952 : List *oids_to_drop = NIL;
19237 :
19238 800774 : foreach(l, on_commits)
19239 : {
19240 822 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19241 :
19242 : /* Ignore entry if already dropped in this xact */
19243 822 : if (oc->deleting_subid != InvalidSubTransactionId)
19244 74 : continue;
19245 :
19246 748 : switch (oc->oncommit)
19247 : {
19248 0 : case ONCOMMIT_NOOP:
19249 : case ONCOMMIT_PRESERVE_ROWS:
19250 : /* Do nothing (there shouldn't be such entries, actually) */
19251 0 : break;
19252 694 : case ONCOMMIT_DELETE_ROWS:
19253 :
19254 : /*
19255 : * If this transaction hasn't accessed any temporary
19256 : * relations, we can skip truncating ON COMMIT DELETE ROWS
19257 : * tables, as they must still be empty.
19258 : */
19259 694 : if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
19260 448 : oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
19261 694 : break;
19262 54 : case ONCOMMIT_DROP:
19263 54 : oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
19264 54 : break;
19265 : }
19266 822 : }
19267 :
19268 : /*
19269 : * Truncate relations before dropping so that all dependencies between
19270 : * relations are removed after they are worked on. Doing it like this
19271 : * might be a waste as it is possible that a relation being truncated will
19272 : * be dropped anyway due to its parent being dropped, but this makes the
19273 : * code more robust because of not having to re-check that the relation
19274 : * exists at truncation time.
19275 : */
19276 799952 : if (oids_to_truncate != NIL)
19277 382 : heap_truncate(oids_to_truncate);
19278 :
19279 799946 : if (oids_to_drop != NIL)
19280 : {
19281 48 : ObjectAddresses *targetObjects = new_object_addresses();
19282 :
19283 102 : foreach(l, oids_to_drop)
19284 : {
19285 : ObjectAddress object;
19286 :
19287 54 : object.classId = RelationRelationId;
19288 54 : object.objectId = lfirst_oid(l);
19289 54 : object.objectSubId = 0;
19290 :
19291 : Assert(!object_address_present(&object, targetObjects));
19292 :
19293 54 : add_exact_object_address(&object, targetObjects);
19294 : }
19295 :
19296 : /*
19297 : * Object deletion might involve toast table access (to clean up
19298 : * toasted catalog entries), so ensure we have a valid snapshot.
19299 : */
19300 48 : PushActiveSnapshot(GetTransactionSnapshot());
19301 :
19302 : /*
19303 : * Since this is an automatic drop, rather than one directly initiated
19304 : * by the user, we pass the PERFORM_DELETION_INTERNAL flag.
19305 : */
19306 48 : performMultipleDeletions(targetObjects, DROP_CASCADE,
19307 : PERFORM_DELETION_INTERNAL | PERFORM_DELETION_QUIETLY);
19308 :
19309 48 : PopActiveSnapshot();
19310 :
19311 : #ifdef USE_ASSERT_CHECKING
19312 :
19313 : /*
19314 : * Note that table deletion will call remove_on_commit_action, so the
19315 : * entry should get marked as deleted.
19316 : */
19317 : foreach(l, on_commits)
19318 : {
19319 : OnCommitItem *oc = (OnCommitItem *) lfirst(l);
19320 :
19321 : if (oc->oncommit != ONCOMMIT_DROP)
19322 : continue;
19323 :
19324 : Assert(oc->deleting_subid != InvalidSubTransactionId);
19325 : }
19326 : #endif
19327 : }
19328 799946 : }
19329 :
19330 : /*
19331 : * Post-commit or post-abort cleanup for ON COMMIT management.
19332 : *
19333 : * All we do here is remove no-longer-needed OnCommitItem entries.
19334 : *
19335 : * During commit, remove entries that were deleted during this transaction;
19336 : * during abort, remove those created during this transaction.
19337 : */
19338 : void
19339 848480 : AtEOXact_on_commit_actions(bool isCommit)
19340 : {
19341 : ListCell *cur_item;
19342 :
19343 849332 : foreach(cur_item, on_commits)
19344 : {
19345 852 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19346 :
19347 954 : if (isCommit ? oc->deleting_subid != InvalidSubTransactionId :
19348 102 : oc->creating_subid != InvalidSubTransactionId)
19349 : {
19350 : /* cur_item must be removed */
19351 152 : on_commits = foreach_delete_current(on_commits, cur_item);
19352 152 : pfree(oc);
19353 : }
19354 : else
19355 : {
19356 : /* cur_item must be preserved */
19357 700 : oc->creating_subid = InvalidSubTransactionId;
19358 700 : oc->deleting_subid = InvalidSubTransactionId;
19359 : }
19360 : }
19361 848480 : }
19362 :
19363 : /*
19364 : * Post-subcommit or post-subabort cleanup for ON COMMIT management.
19365 : *
19366 : * During subabort, we can immediately remove entries created during this
19367 : * subtransaction. During subcommit, just relabel entries marked during
19368 : * this subtransaction as being the parent's responsibility.
19369 : */
19370 : void
19371 20056 : AtEOSubXact_on_commit_actions(bool isCommit, SubTransactionId mySubid,
19372 : SubTransactionId parentSubid)
19373 : {
19374 : ListCell *cur_item;
19375 :
19376 20056 : foreach(cur_item, on_commits)
19377 : {
19378 0 : OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
19379 :
19380 0 : if (!isCommit && oc->creating_subid == mySubid)
19381 : {
19382 : /* cur_item must be removed */
19383 0 : on_commits = foreach_delete_current(on_commits, cur_item);
19384 0 : pfree(oc);
19385 : }
19386 : else
19387 : {
19388 : /* cur_item must be preserved */
19389 0 : if (oc->creating_subid == mySubid)
19390 0 : oc->creating_subid = parentSubid;
19391 0 : if (oc->deleting_subid == mySubid)
19392 0 : oc->deleting_subid = isCommit ? parentSubid : InvalidSubTransactionId;
19393 : }
19394 : }
19395 20056 : }
19396 :
19397 : /*
19398 : * This is intended as a callback for RangeVarGetRelidExtended(). It allows
19399 : * the relation to be locked only if (1) it's a plain or partitioned table,
19400 : * materialized view, or TOAST table and (2) the current user is the owner (or
19401 : * the superuser) or has been granted MAINTAIN. This meets the
19402 : * permission-checking needs of CLUSTER, REINDEX TABLE, and REFRESH
19403 : * MATERIALIZED VIEW; we expose it here so that it can be used by all.
19404 : */
19405 : void
19406 1022 : RangeVarCallbackMaintainsTable(const RangeVar *relation,
19407 : Oid relId, Oid oldRelId, void *arg)
19408 : {
19409 : char relkind;
19410 : AclResult aclresult;
19411 :
19412 : /* Nothing to do if the relation was not found. */
19413 1022 : if (!OidIsValid(relId))
19414 6 : return;
19415 :
19416 : /*
19417 : * If the relation does exist, check whether it's an index. But note that
19418 : * the relation might have been dropped between the time we did the name
19419 : * lookup and now. In that case, there's nothing to do.
19420 : */
19421 1016 : relkind = get_rel_relkind(relId);
19422 1016 : if (!relkind)
19423 0 : return;
19424 1016 : if (relkind != RELKIND_RELATION && relkind != RELKIND_TOASTVALUE &&
19425 138 : relkind != RELKIND_MATVIEW && relkind != RELKIND_PARTITIONED_TABLE)
19426 28 : ereport(ERROR,
19427 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19428 : errmsg("\"%s\" is not a table or materialized view", relation->relname)));
19429 :
19430 : /* Check permissions */
19431 988 : aclresult = pg_class_aclcheck(relId, GetUserId(), ACL_MAINTAIN);
19432 988 : if (aclresult != ACLCHECK_OK)
19433 30 : aclcheck_error(aclresult,
19434 30 : get_relkind_objtype(get_rel_relkind(relId)),
19435 30 : relation->relname);
19436 : }
19437 :
19438 : /*
19439 : * Callback to RangeVarGetRelidExtended() for TRUNCATE processing.
19440 : */
19441 : static void
19442 3586 : RangeVarCallbackForTruncate(const RangeVar *relation,
19443 : Oid relId, Oid oldRelId, void *arg)
19444 : {
19445 : HeapTuple tuple;
19446 :
19447 : /* Nothing to do if the relation was not found. */
19448 3586 : if (!OidIsValid(relId))
19449 0 : return;
19450 :
19451 3586 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19452 3586 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19453 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19454 :
19455 3586 : truncate_check_rel(relId, (Form_pg_class) GETSTRUCT(tuple));
19456 3580 : truncate_check_perms(relId, (Form_pg_class) GETSTRUCT(tuple));
19457 :
19458 3548 : ReleaseSysCache(tuple);
19459 : }
19460 :
19461 : /*
19462 : * Callback for RangeVarGetRelidExtended(). Checks that the current user is
19463 : * the owner of the relation, or superuser.
19464 : */
19465 : void
19466 16054 : RangeVarCallbackOwnsRelation(const RangeVar *relation,
19467 : Oid relId, Oid oldRelId, void *arg)
19468 : {
19469 : HeapTuple tuple;
19470 :
19471 : /* Nothing to do if the relation was not found. */
19472 16054 : if (!OidIsValid(relId))
19473 14 : return;
19474 :
19475 16040 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relId));
19476 16040 : if (!HeapTupleIsValid(tuple)) /* should not happen */
19477 0 : elog(ERROR, "cache lookup failed for relation %u", relId);
19478 :
19479 16040 : if (!object_ownercheck(RelationRelationId, relId, GetUserId()))
19480 6 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relId)),
19481 6 : relation->relname);
19482 :
19483 31948 : if (!allowSystemTableMods &&
19484 15914 : IsSystemClass(relId, (Form_pg_class) GETSTRUCT(tuple)))
19485 2 : ereport(ERROR,
19486 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19487 : errmsg("permission denied: \"%s\" is a system catalog",
19488 : relation->relname)));
19489 :
19490 16032 : ReleaseSysCache(tuple);
19491 : }
19492 :
19493 : /*
19494 : * Common RangeVarGetRelid callback for rename, set schema, and alter table
19495 : * processing.
19496 : */
19497 : static void
19498 35792 : RangeVarCallbackForAlterRelation(const RangeVar *rv, Oid relid, Oid oldrelid,
19499 : void *arg)
19500 : {
19501 35792 : Node *stmt = (Node *) arg;
19502 : ObjectType reltype;
19503 : HeapTuple tuple;
19504 : Form_pg_class classform;
19505 : AclResult aclresult;
19506 : char relkind;
19507 :
19508 35792 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
19509 35792 : if (!HeapTupleIsValid(tuple))
19510 222 : return; /* concurrently dropped */
19511 35570 : classform = (Form_pg_class) GETSTRUCT(tuple);
19512 35570 : relkind = classform->relkind;
19513 :
19514 : /* Must own relation. */
19515 35570 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
19516 60 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
19517 :
19518 : /* No system table modifications unless explicitly allowed. */
19519 35510 : if (!allowSystemTableMods && IsSystemClass(relid, classform))
19520 30 : ereport(ERROR,
19521 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
19522 : errmsg("permission denied: \"%s\" is a system catalog",
19523 : rv->relname)));
19524 :
19525 : /*
19526 : * Extract the specified relation type from the statement parse tree.
19527 : *
19528 : * Also, for ALTER .. RENAME, check permissions: the user must (still)
19529 : * have CREATE rights on the containing namespace.
19530 : */
19531 35480 : if (IsA(stmt, RenameStmt))
19532 : {
19533 490 : aclresult = object_aclcheck(NamespaceRelationId, classform->relnamespace,
19534 : GetUserId(), ACL_CREATE);
19535 490 : if (aclresult != ACLCHECK_OK)
19536 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
19537 0 : get_namespace_name(classform->relnamespace));
19538 490 : reltype = ((RenameStmt *) stmt)->renameType;
19539 : }
19540 34990 : else if (IsA(stmt, AlterObjectSchemaStmt))
19541 90 : reltype = ((AlterObjectSchemaStmt *) stmt)->objectType;
19542 :
19543 34900 : else if (IsA(stmt, AlterTableStmt))
19544 34900 : reltype = ((AlterTableStmt *) stmt)->objtype;
19545 : else
19546 : {
19547 0 : elog(ERROR, "unrecognized node type: %d", (int) nodeTag(stmt));
19548 : reltype = OBJECT_TABLE; /* placate compiler */
19549 : }
19550 :
19551 : /*
19552 : * For compatibility with prior releases, we allow ALTER TABLE to be used
19553 : * with most other types of relations (but not composite types). We allow
19554 : * similar flexibility for ALTER INDEX in the case of RENAME, but not
19555 : * otherwise. Otherwise, the user must select the correct form of the
19556 : * command for the relation at issue.
19557 : */
19558 35480 : if (reltype == OBJECT_SEQUENCE && relkind != RELKIND_SEQUENCE)
19559 0 : ereport(ERROR,
19560 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19561 : errmsg("\"%s\" is not a sequence", rv->relname)));
19562 :
19563 35480 : if (reltype == OBJECT_VIEW && relkind != RELKIND_VIEW)
19564 0 : ereport(ERROR,
19565 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19566 : errmsg("\"%s\" is not a view", rv->relname)));
19567 :
19568 35480 : if (reltype == OBJECT_MATVIEW && relkind != RELKIND_MATVIEW)
19569 0 : ereport(ERROR,
19570 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19571 : errmsg("\"%s\" is not a materialized view", rv->relname)));
19572 :
19573 35480 : if (reltype == OBJECT_FOREIGN_TABLE && relkind != RELKIND_FOREIGN_TABLE)
19574 0 : ereport(ERROR,
19575 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19576 : errmsg("\"%s\" is not a foreign table", rv->relname)));
19577 :
19578 35480 : if (reltype == OBJECT_TYPE && relkind != RELKIND_COMPOSITE_TYPE)
19579 0 : ereport(ERROR,
19580 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19581 : errmsg("\"%s\" is not a composite type", rv->relname)));
19582 :
19583 35480 : if (reltype == OBJECT_INDEX && relkind != RELKIND_INDEX &&
19584 : relkind != RELKIND_PARTITIONED_INDEX
19585 36 : && !IsA(stmt, RenameStmt))
19586 6 : ereport(ERROR,
19587 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19588 : errmsg("\"%s\" is not an index", rv->relname)));
19589 :
19590 : /*
19591 : * Don't allow ALTER TABLE on composite types. We want people to use ALTER
19592 : * TYPE for that.
19593 : */
19594 35474 : if (reltype != OBJECT_TYPE && relkind == RELKIND_COMPOSITE_TYPE)
19595 0 : ereport(ERROR,
19596 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19597 : errmsg("\"%s\" is a composite type", rv->relname),
19598 : /* translator: %s is an SQL ALTER command */
19599 : errhint("Use %s instead.",
19600 : "ALTER TYPE")));
19601 :
19602 : /*
19603 : * Don't allow ALTER TABLE .. SET SCHEMA on relations that can't be moved
19604 : * to a different schema, such as indexes and TOAST tables.
19605 : */
19606 35474 : if (IsA(stmt, AlterObjectSchemaStmt))
19607 : {
19608 90 : if (relkind == RELKIND_INDEX || relkind == RELKIND_PARTITIONED_INDEX)
19609 0 : ereport(ERROR,
19610 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19611 : errmsg("cannot change schema of index \"%s\"",
19612 : rv->relname),
19613 : errhint("Change the schema of the table instead.")));
19614 90 : else if (relkind == RELKIND_COMPOSITE_TYPE)
19615 0 : ereport(ERROR,
19616 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19617 : errmsg("cannot change schema of composite type \"%s\"",
19618 : rv->relname),
19619 : /* translator: %s is an SQL ALTER command */
19620 : errhint("Use %s instead.",
19621 : "ALTER TYPE")));
19622 90 : else if (relkind == RELKIND_TOASTVALUE)
19623 0 : ereport(ERROR,
19624 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
19625 : errmsg("cannot change schema of TOAST table \"%s\"",
19626 : rv->relname),
19627 : errhint("Change the schema of the table instead.")));
19628 : }
19629 :
19630 35474 : ReleaseSysCache(tuple);
19631 : }
19632 :
19633 : /*
19634 : * Transform any expressions present in the partition key
19635 : *
19636 : * Returns a transformed PartitionSpec.
19637 : */
19638 : static PartitionSpec *
19639 5090 : transformPartitionSpec(Relation rel, PartitionSpec *partspec)
19640 : {
19641 : PartitionSpec *newspec;
19642 : ParseState *pstate;
19643 : ParseNamespaceItem *nsitem;
19644 : ListCell *l;
19645 :
19646 5090 : newspec = makeNode(PartitionSpec);
19647 :
19648 5090 : newspec->strategy = partspec->strategy;
19649 5090 : newspec->partParams = NIL;
19650 5090 : newspec->location = partspec->location;
19651 :
19652 : /* Check valid number of columns for strategy */
19653 7648 : if (partspec->strategy == PARTITION_STRATEGY_LIST &&
19654 2558 : list_length(partspec->partParams) != 1)
19655 6 : ereport(ERROR,
19656 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19657 : errmsg("cannot use \"list\" partition strategy with more than one column")));
19658 :
19659 : /*
19660 : * Create a dummy ParseState and insert the target relation as its sole
19661 : * rangetable entry. We need a ParseState for transformExpr.
19662 : */
19663 5084 : pstate = make_parsestate(NULL);
19664 5084 : nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock,
19665 : NULL, false, true);
19666 5084 : addNSItemToQuery(pstate, nsitem, true, true, true);
19667 :
19668 : /* take care of any partition expressions */
19669 10604 : foreach(l, partspec->partParams)
19670 : {
19671 5544 : PartitionElem *pelem = lfirst_node(PartitionElem, l);
19672 :
19673 5544 : if (pelem->expr)
19674 : {
19675 : /* Copy, to avoid scribbling on the input */
19676 320 : pelem = copyObject(pelem);
19677 :
19678 : /* Now do parse transformation of the expression */
19679 320 : pelem->expr = transformExpr(pstate, pelem->expr,
19680 : EXPR_KIND_PARTITION_EXPRESSION);
19681 :
19682 : /* we have to fix its collations too */
19683 296 : assign_expr_collations(pstate, pelem->expr);
19684 : }
19685 :
19686 5520 : newspec->partParams = lappend(newspec->partParams, pelem);
19687 : }
19688 :
19689 5060 : return newspec;
19690 : }
19691 :
19692 : /*
19693 : * Compute per-partition-column information from a list of PartitionElems.
19694 : * Expressions in the PartitionElems must be parse-analyzed already.
19695 : */
19696 : static void
19697 5060 : ComputePartitionAttrs(ParseState *pstate, Relation rel, List *partParams, AttrNumber *partattrs,
19698 : List **partexprs, Oid *partopclass, Oid *partcollation,
19699 : PartitionStrategy strategy)
19700 : {
19701 : int attn;
19702 : ListCell *lc;
19703 : Oid am_oid;
19704 :
19705 5060 : attn = 0;
19706 10484 : foreach(lc, partParams)
19707 : {
19708 5520 : PartitionElem *pelem = lfirst_node(PartitionElem, lc);
19709 : Oid atttype;
19710 : Oid attcollation;
19711 :
19712 5520 : if (pelem->name != NULL)
19713 : {
19714 : /* Simple attribute reference */
19715 : HeapTuple atttuple;
19716 : Form_pg_attribute attform;
19717 :
19718 5224 : atttuple = SearchSysCacheAttName(RelationGetRelid(rel),
19719 5224 : pelem->name);
19720 5224 : if (!HeapTupleIsValid(atttuple))
19721 12 : ereport(ERROR,
19722 : (errcode(ERRCODE_UNDEFINED_COLUMN),
19723 : errmsg("column \"%s\" named in partition key does not exist",
19724 : pelem->name),
19725 : parser_errposition(pstate, pelem->location)));
19726 5212 : attform = (Form_pg_attribute) GETSTRUCT(atttuple);
19727 :
19728 5212 : if (attform->attnum <= 0)
19729 6 : ereport(ERROR,
19730 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19731 : errmsg("cannot use system column \"%s\" in partition key",
19732 : pelem->name),
19733 : parser_errposition(pstate, pelem->location)));
19734 :
19735 : /*
19736 : * Stored generated columns cannot work: They are computed after
19737 : * BEFORE triggers, but partition routing is done before all
19738 : * triggers. Maybe virtual generated columns could be made to
19739 : * work, but then they would need to be handled as an expression
19740 : * below.
19741 : */
19742 5206 : if (attform->attgenerated)
19743 12 : ereport(ERROR,
19744 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19745 : errmsg("cannot use generated column in partition key"),
19746 : errdetail("Column \"%s\" is a generated column.",
19747 : pelem->name),
19748 : parser_errposition(pstate, pelem->location)));
19749 :
19750 5194 : partattrs[attn] = attform->attnum;
19751 5194 : atttype = attform->atttypid;
19752 5194 : attcollation = attform->attcollation;
19753 5194 : ReleaseSysCache(atttuple);
19754 : }
19755 : else
19756 : {
19757 : /* Expression */
19758 296 : Node *expr = pelem->expr;
19759 : char partattname[16];
19760 :
19761 : Assert(expr != NULL);
19762 296 : atttype = exprType(expr);
19763 296 : attcollation = exprCollation(expr);
19764 :
19765 : /*
19766 : * The expression must be of a storable type (e.g., not RECORD).
19767 : * The test is the same as for whether a table column is of a safe
19768 : * type (which is why we needn't check for the non-expression
19769 : * case).
19770 : */
19771 296 : snprintf(partattname, sizeof(partattname), "%d", attn + 1);
19772 296 : CheckAttributeType(partattname,
19773 : atttype, attcollation,
19774 : NIL, CHKATYPE_IS_PARTKEY);
19775 :
19776 : /*
19777 : * Strip any top-level COLLATE clause. This ensures that we treat
19778 : * "x COLLATE y" and "(x COLLATE y)" alike.
19779 : */
19780 284 : while (IsA(expr, CollateExpr))
19781 0 : expr = (Node *) ((CollateExpr *) expr)->arg;
19782 :
19783 284 : if (IsA(expr, Var) &&
19784 12 : ((Var *) expr)->varattno > 0)
19785 : {
19786 : /*
19787 : * User wrote "(column)" or "(column COLLATE something)".
19788 : * Treat it like simple attribute anyway.
19789 : */
19790 6 : partattrs[attn] = ((Var *) expr)->varattno;
19791 : }
19792 : else
19793 : {
19794 278 : Bitmapset *expr_attrs = NULL;
19795 : int i;
19796 :
19797 278 : partattrs[attn] = 0; /* marks the column as expression */
19798 278 : *partexprs = lappend(*partexprs, expr);
19799 :
19800 : /*
19801 : * transformPartitionSpec() should have already rejected
19802 : * subqueries, aggregates, window functions, and SRFs, based
19803 : * on the EXPR_KIND_ for partition expressions.
19804 : */
19805 :
19806 : /*
19807 : * Cannot allow system column references, since that would
19808 : * make partition routing impossible: their values won't be
19809 : * known yet when we need to do that.
19810 : */
19811 278 : pull_varattnos(expr, 1, &expr_attrs);
19812 2224 : for (i = FirstLowInvalidHeapAttributeNumber; i < 0; i++)
19813 : {
19814 1946 : if (bms_is_member(i - FirstLowInvalidHeapAttributeNumber,
19815 : expr_attrs))
19816 0 : ereport(ERROR,
19817 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19818 : errmsg("partition key expressions cannot contain system column references")));
19819 : }
19820 :
19821 : /*
19822 : * Stored generated columns cannot work: They are computed
19823 : * after BEFORE triggers, but partition routing is done before
19824 : * all triggers. Virtual generated columns could probably
19825 : * work, but it would require more work elsewhere (for example
19826 : * SET EXPRESSION would need to check whether the column is
19827 : * used in partition keys). Seems safer to prohibit for now.
19828 : */
19829 278 : i = -1;
19830 612 : while ((i = bms_next_member(expr_attrs, i)) >= 0)
19831 : {
19832 346 : AttrNumber attno = i + FirstLowInvalidHeapAttributeNumber;
19833 :
19834 346 : if (attno > 0 &&
19835 340 : TupleDescAttr(RelationGetDescr(rel), attno - 1)->attgenerated)
19836 12 : ereport(ERROR,
19837 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19838 : errmsg("cannot use generated column in partition key"),
19839 : errdetail("Column \"%s\" is a generated column.",
19840 : get_attname(RelationGetRelid(rel), attno, false)),
19841 : parser_errposition(pstate, pelem->location)));
19842 : }
19843 :
19844 : /*
19845 : * Preprocess the expression before checking for mutability.
19846 : * This is essential for the reasons described in
19847 : * contain_mutable_functions_after_planning. However, we call
19848 : * expression_planner for ourselves rather than using that
19849 : * function, because if constant-folding reduces the
19850 : * expression to a constant, we'd like to know that so we can
19851 : * complain below.
19852 : *
19853 : * Like contain_mutable_functions_after_planning, assume that
19854 : * expression_planner won't scribble on its input, so this
19855 : * won't affect the partexprs entry we saved above.
19856 : */
19857 266 : expr = (Node *) expression_planner((Expr *) expr);
19858 :
19859 : /*
19860 : * Partition expressions cannot contain mutable functions,
19861 : * because a given row must always map to the same partition
19862 : * as long as there is no change in the partition boundary
19863 : * structure.
19864 : */
19865 266 : if (contain_mutable_functions(expr))
19866 6 : ereport(ERROR,
19867 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19868 : errmsg("functions in partition key expression must be marked IMMUTABLE")));
19869 :
19870 : /*
19871 : * While it is not exactly *wrong* for a partition expression
19872 : * to be a constant, it seems better to reject such keys.
19873 : */
19874 260 : if (IsA(expr, Const))
19875 12 : ereport(ERROR,
19876 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
19877 : errmsg("cannot use constant expression as partition key")));
19878 : }
19879 : }
19880 :
19881 : /*
19882 : * Apply collation override if any
19883 : */
19884 5448 : if (pelem->collation)
19885 54 : attcollation = get_collation_oid(pelem->collation, false);
19886 :
19887 : /*
19888 : * Check we have a collation iff it's a collatable type. The only
19889 : * expected failures here are (1) COLLATE applied to a noncollatable
19890 : * type, or (2) partition expression had an unresolved collation. But
19891 : * we might as well code this to be a complete consistency check.
19892 : */
19893 5448 : if (type_is_collatable(atttype))
19894 : {
19895 640 : if (!OidIsValid(attcollation))
19896 0 : ereport(ERROR,
19897 : (errcode(ERRCODE_INDETERMINATE_COLLATION),
19898 : errmsg("could not determine which collation to use for partition expression"),
19899 : errhint("Use the COLLATE clause to set the collation explicitly.")));
19900 : }
19901 : else
19902 : {
19903 4808 : if (OidIsValid(attcollation))
19904 0 : ereport(ERROR,
19905 : (errcode(ERRCODE_DATATYPE_MISMATCH),
19906 : errmsg("collations are not supported by type %s",
19907 : format_type_be(atttype))));
19908 : }
19909 :
19910 5448 : partcollation[attn] = attcollation;
19911 :
19912 : /*
19913 : * Identify the appropriate operator class. For list and range
19914 : * partitioning, we use a btree operator class; hash partitioning uses
19915 : * a hash operator class.
19916 : */
19917 5448 : if (strategy == PARTITION_STRATEGY_HASH)
19918 314 : am_oid = HASH_AM_OID;
19919 : else
19920 5134 : am_oid = BTREE_AM_OID;
19921 :
19922 5448 : if (!pelem->opclass)
19923 : {
19924 5316 : partopclass[attn] = GetDefaultOpClass(atttype, am_oid);
19925 :
19926 5316 : if (!OidIsValid(partopclass[attn]))
19927 : {
19928 12 : if (strategy == PARTITION_STRATEGY_HASH)
19929 0 : ereport(ERROR,
19930 : (errcode(ERRCODE_UNDEFINED_OBJECT),
19931 : errmsg("data type %s has no default operator class for access method \"%s\"",
19932 : format_type_be(atttype), "hash"),
19933 : errhint("You must specify a hash operator class or define a default hash operator class for the data type.")));
19934 : else
19935 12 : ereport(ERROR,
19936 : (errcode(ERRCODE_UNDEFINED_OBJECT),
19937 : errmsg("data type %s has no default operator class for access method \"%s\"",
19938 : format_type_be(atttype), "btree"),
19939 : errhint("You must specify a btree operator class or define a default btree operator class for the data type.")));
19940 : }
19941 : }
19942 : else
19943 132 : partopclass[attn] = ResolveOpClass(pelem->opclass,
19944 : atttype,
19945 : am_oid == HASH_AM_OID ? "hash" : "btree",
19946 : am_oid);
19947 :
19948 5424 : attn++;
19949 : }
19950 4964 : }
19951 :
19952 : /*
19953 : * PartConstraintImpliedByRelConstraint
19954 : * Do scanrel's existing constraints imply the partition constraint?
19955 : *
19956 : * "Existing constraints" include its check constraints and column-level
19957 : * not-null constraints. partConstraint describes the partition constraint,
19958 : * in implicit-AND form.
19959 : */
19960 : bool
19961 3602 : PartConstraintImpliedByRelConstraint(Relation scanrel,
19962 : List *partConstraint)
19963 : {
19964 3602 : List *existConstraint = NIL;
19965 3602 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
19966 : int i;
19967 :
19968 3602 : if (constr && constr->has_not_null)
19969 : {
19970 956 : int natts = scanrel->rd_att->natts;
19971 :
19972 3038 : for (i = 1; i <= natts; i++)
19973 : {
19974 2082 : CompactAttribute *att = TupleDescCompactAttr(scanrel->rd_att, i - 1);
19975 :
19976 : /* invalid not-null constraint must be ignored here */
19977 2082 : if (att->attnullability == ATTNULLABLE_VALID && !att->attisdropped)
19978 : {
19979 1274 : Form_pg_attribute wholeatt = TupleDescAttr(scanrel->rd_att, i - 1);
19980 1274 : NullTest *ntest = makeNode(NullTest);
19981 :
19982 1274 : ntest->arg = (Expr *) makeVar(1,
19983 : i,
19984 : wholeatt->atttypid,
19985 : wholeatt->atttypmod,
19986 : wholeatt->attcollation,
19987 : 0);
19988 1274 : ntest->nulltesttype = IS_NOT_NULL;
19989 :
19990 : /*
19991 : * argisrow=false is correct even for a composite column,
19992 : * because attnotnull does not represent a SQL-spec IS NOT
19993 : * NULL test in such a case, just IS DISTINCT FROM NULL.
19994 : */
19995 1274 : ntest->argisrow = false;
19996 1274 : ntest->location = -1;
19997 1274 : existConstraint = lappend(existConstraint, ntest);
19998 : }
19999 : }
20000 : }
20001 :
20002 3602 : return ConstraintImpliedByRelConstraint(scanrel, partConstraint, existConstraint);
20003 : }
20004 :
20005 : /*
20006 : * ConstraintImpliedByRelConstraint
20007 : * Do scanrel's existing constraints imply the given constraint?
20008 : *
20009 : * testConstraint is the constraint to validate. provenConstraint is a
20010 : * caller-provided list of conditions which this function may assume
20011 : * to be true. Both provenConstraint and testConstraint must be in
20012 : * implicit-AND form, must only contain immutable clauses, and must
20013 : * contain only Vars with varno = 1.
20014 : */
20015 : bool
20016 4840 : ConstraintImpliedByRelConstraint(Relation scanrel, List *testConstraint, List *provenConstraint)
20017 : {
20018 4840 : List *existConstraint = list_copy(provenConstraint);
20019 4840 : TupleConstr *constr = RelationGetDescr(scanrel)->constr;
20020 : int num_check,
20021 : i;
20022 :
20023 4840 : num_check = (constr != NULL) ? constr->num_check : 0;
20024 5360 : for (i = 0; i < num_check; i++)
20025 : {
20026 : Node *cexpr;
20027 :
20028 : /*
20029 : * If this constraint hasn't been fully validated yet, we must ignore
20030 : * it here.
20031 : */
20032 520 : if (!constr->check[i].ccvalid)
20033 6 : continue;
20034 :
20035 : /*
20036 : * NOT ENFORCED constraints are always marked as invalid, which should
20037 : * have been ignored.
20038 : */
20039 : Assert(constr->check[i].ccenforced);
20040 :
20041 514 : cexpr = stringToNode(constr->check[i].ccbin);
20042 :
20043 : /*
20044 : * Run each expression through const-simplification and
20045 : * canonicalization. It is necessary, because we will be comparing it
20046 : * to similarly-processed partition constraint expressions, and may
20047 : * fail to detect valid matches without this.
20048 : */
20049 514 : cexpr = eval_const_expressions(NULL, cexpr);
20050 514 : cexpr = (Node *) canonicalize_qual((Expr *) cexpr, true);
20051 :
20052 514 : existConstraint = list_concat(existConstraint,
20053 514 : make_ands_implicit((Expr *) cexpr));
20054 : }
20055 :
20056 : /*
20057 : * Try to make the proof. Since we are comparing CHECK constraints, we
20058 : * need to use weak implication, i.e., we assume existConstraint is
20059 : * not-false and try to prove the same for testConstraint.
20060 : *
20061 : * Note that predicate_implied_by assumes its first argument is known
20062 : * immutable. That should always be true for both NOT NULL and partition
20063 : * constraints, so we don't test it here.
20064 : */
20065 4840 : return predicate_implied_by(testConstraint, existConstraint, true);
20066 : }
20067 :
20068 : /*
20069 : * QueuePartitionConstraintValidation
20070 : *
20071 : * Add an entry to wqueue to have the given partition constraint validated by
20072 : * Phase 3, for the given relation, and all its children.
20073 : *
20074 : * We first verify whether the given constraint is implied by pre-existing
20075 : * relation constraints; if it is, there's no need to scan the table to
20076 : * validate, so don't queue in that case.
20077 : */
20078 : static void
20079 2972 : QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
20080 : List *partConstraint,
20081 : bool validate_default)
20082 : {
20083 : /*
20084 : * Based on the table's existing constraints, determine whether or not we
20085 : * may skip scanning the table.
20086 : */
20087 2972 : if (PartConstraintImpliedByRelConstraint(scanrel, partConstraint))
20088 : {
20089 92 : if (!validate_default)
20090 70 : ereport(DEBUG1,
20091 : (errmsg_internal("partition constraint for table \"%s\" is implied by existing constraints",
20092 : RelationGetRelationName(scanrel))));
20093 : else
20094 22 : ereport(DEBUG1,
20095 : (errmsg_internal("updated partition constraint for default partition \"%s\" is implied by existing constraints",
20096 : RelationGetRelationName(scanrel))));
20097 92 : return;
20098 : }
20099 :
20100 : /*
20101 : * Constraints proved insufficient. For plain relations, queue a
20102 : * validation item now; for partitioned tables, recurse to process each
20103 : * partition.
20104 : */
20105 2880 : if (scanrel->rd_rel->relkind == RELKIND_RELATION)
20106 : {
20107 : AlteredTableInfo *tab;
20108 :
20109 : /* Grab a work queue entry. */
20110 2420 : tab = ATGetQueueEntry(wqueue, scanrel);
20111 : Assert(tab->partition_constraint == NULL);
20112 2420 : tab->partition_constraint = (Expr *) linitial(partConstraint);
20113 2420 : tab->validate_default = validate_default;
20114 : }
20115 460 : else if (scanrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20116 : {
20117 412 : PartitionDesc partdesc = RelationGetPartitionDesc(scanrel, true);
20118 : int i;
20119 :
20120 808 : for (i = 0; i < partdesc->nparts; i++)
20121 : {
20122 : Relation part_rel;
20123 : List *thisPartConstraint;
20124 :
20125 : /*
20126 : * This is the minimum lock we need to prevent deadlocks.
20127 : */
20128 396 : part_rel = table_open(partdesc->oids[i], AccessExclusiveLock);
20129 :
20130 : /*
20131 : * Adjust the constraint for scanrel so that it matches this
20132 : * partition's attribute numbers.
20133 : */
20134 : thisPartConstraint =
20135 396 : map_partition_varattnos(partConstraint, 1,
20136 : part_rel, scanrel);
20137 :
20138 396 : QueuePartitionConstraintValidation(wqueue, part_rel,
20139 : thisPartConstraint,
20140 : validate_default);
20141 396 : table_close(part_rel, NoLock); /* keep lock till commit */
20142 : }
20143 : }
20144 : }
20145 :
20146 : /*
20147 : * ALTER TABLE <name> ATTACH PARTITION <partition-name> FOR VALUES
20148 : *
20149 : * Return the address of the newly attached partition.
20150 : */
20151 : static ObjectAddress
20152 2796 : ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd,
20153 : AlterTableUtilityContext *context)
20154 : {
20155 : Relation attachrel,
20156 : catalog;
20157 : List *attachrel_children;
20158 : List *partConstraint;
20159 : SysScanDesc scan;
20160 : ScanKeyData skey;
20161 : AttrNumber attno;
20162 : int natts;
20163 : TupleDesc tupleDesc;
20164 : ObjectAddress address;
20165 : const char *trigger_name;
20166 : Oid defaultPartOid;
20167 : List *partBoundConstraint;
20168 2796 : ParseState *pstate = make_parsestate(NULL);
20169 :
20170 2796 : pstate->p_sourcetext = context->queryString;
20171 :
20172 : /*
20173 : * We must lock the default partition if one exists, because attaching a
20174 : * new partition will change its partition constraint.
20175 : */
20176 : defaultPartOid =
20177 2796 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20178 2796 : if (OidIsValid(defaultPartOid))
20179 184 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20180 :
20181 2796 : attachrel = table_openrv(cmd->name, AccessExclusiveLock);
20182 :
20183 : /*
20184 : * XXX I think it'd be a good idea to grab locks on all tables referenced
20185 : * by FKs at this point also.
20186 : */
20187 :
20188 : /*
20189 : * Must be owner of both parent and source table -- parent was checked by
20190 : * ATSimplePermissions call in ATPrepCmd
20191 : */
20192 2790 : ATSimplePermissions(AT_AttachPartition, attachrel,
20193 : ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
20194 :
20195 : /* A partition can only have one parent */
20196 2784 : if (attachrel->rd_rel->relispartition)
20197 6 : ereport(ERROR,
20198 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20199 : errmsg("\"%s\" is already a partition",
20200 : RelationGetRelationName(attachrel))));
20201 :
20202 2778 : if (OidIsValid(attachrel->rd_rel->reloftype))
20203 6 : ereport(ERROR,
20204 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20205 : errmsg("cannot attach a typed table as partition")));
20206 :
20207 : /*
20208 : * Table being attached should not already be part of inheritance; either
20209 : * as a child table...
20210 : */
20211 2772 : catalog = table_open(InheritsRelationId, AccessShareLock);
20212 2772 : ScanKeyInit(&skey,
20213 : Anum_pg_inherits_inhrelid,
20214 : BTEqualStrategyNumber, F_OIDEQ,
20215 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20216 2772 : scan = systable_beginscan(catalog, InheritsRelidSeqnoIndexId, true,
20217 : NULL, 1, &skey);
20218 2772 : if (HeapTupleIsValid(systable_getnext(scan)))
20219 6 : ereport(ERROR,
20220 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20221 : errmsg("cannot attach inheritance child as partition")));
20222 2766 : systable_endscan(scan);
20223 :
20224 : /* ...or as a parent table (except the case when it is partitioned) */
20225 2766 : ScanKeyInit(&skey,
20226 : Anum_pg_inherits_inhparent,
20227 : BTEqualStrategyNumber, F_OIDEQ,
20228 : ObjectIdGetDatum(RelationGetRelid(attachrel)));
20229 2766 : scan = systable_beginscan(catalog, InheritsParentIndexId, true, NULL,
20230 : 1, &skey);
20231 2766 : if (HeapTupleIsValid(systable_getnext(scan)) &&
20232 264 : attachrel->rd_rel->relkind == RELKIND_RELATION)
20233 6 : ereport(ERROR,
20234 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20235 : errmsg("cannot attach inheritance parent as partition")));
20236 2760 : systable_endscan(scan);
20237 2760 : table_close(catalog, AccessShareLock);
20238 :
20239 : /*
20240 : * Prevent circularity by seeing if rel is a partition of attachrel. (In
20241 : * particular, this disallows making a rel a partition of itself.)
20242 : *
20243 : * We do that by checking if rel is a member of the list of attachrel's
20244 : * partitions provided the latter is partitioned at all. We want to avoid
20245 : * having to construct this list again, so we request the strongest lock
20246 : * on all partitions. We need the strongest lock, because we may decide
20247 : * to scan them if we find out that the table being attached (or its leaf
20248 : * partitions) may contain rows that violate the partition constraint. If
20249 : * the table has a constraint that would prevent such rows, which by
20250 : * definition is present in all the partitions, we need not scan the
20251 : * table, nor its partitions. But we cannot risk a deadlock by taking a
20252 : * weaker lock now and the stronger one only when needed.
20253 : */
20254 2760 : attachrel_children = find_all_inheritors(RelationGetRelid(attachrel),
20255 : AccessExclusiveLock, NULL);
20256 2760 : if (list_member_oid(attachrel_children, RelationGetRelid(rel)))
20257 12 : ereport(ERROR,
20258 : (errcode(ERRCODE_DUPLICATE_TABLE),
20259 : errmsg("circular inheritance not allowed"),
20260 : errdetail("\"%s\" is already a child of \"%s\".",
20261 : RelationGetRelationName(rel),
20262 : RelationGetRelationName(attachrel))));
20263 :
20264 : /* If the parent is permanent, so must be all of its partitions. */
20265 2748 : if (rel->rd_rel->relpersistence != RELPERSISTENCE_TEMP &&
20266 2706 : attachrel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
20267 6 : ereport(ERROR,
20268 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20269 : errmsg("cannot attach a temporary relation as partition of permanent relation \"%s\"",
20270 : RelationGetRelationName(rel))));
20271 :
20272 : /* Temp parent cannot have a partition that is itself not a temp */
20273 2742 : if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20274 42 : attachrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
20275 18 : ereport(ERROR,
20276 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20277 : errmsg("cannot attach a permanent relation as partition of temporary relation \"%s\"",
20278 : RelationGetRelationName(rel))));
20279 :
20280 : /* If the parent is temp, it must belong to this session */
20281 2724 : if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20282 24 : !rel->rd_islocaltemp)
20283 0 : ereport(ERROR,
20284 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20285 : errmsg("cannot attach as partition of temporary relation of another session")));
20286 :
20287 : /* Ditto for the partition */
20288 2724 : if (attachrel->rd_rel->relpersistence == RELPERSISTENCE_TEMP &&
20289 24 : !attachrel->rd_islocaltemp)
20290 0 : ereport(ERROR,
20291 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20292 : errmsg("cannot attach temporary relation of another session as partition")));
20293 :
20294 : /*
20295 : * Check if attachrel has any identity columns or any columns that aren't
20296 : * in the parent.
20297 : */
20298 2724 : tupleDesc = RelationGetDescr(attachrel);
20299 2724 : natts = tupleDesc->natts;
20300 9266 : for (attno = 1; attno <= natts; attno++)
20301 : {
20302 6584 : Form_pg_attribute attribute = TupleDescAttr(tupleDesc, attno - 1);
20303 6584 : char *attributeName = NameStr(attribute->attname);
20304 :
20305 : /* Ignore dropped */
20306 6584 : if (attribute->attisdropped)
20307 580 : continue;
20308 :
20309 6004 : if (attribute->attidentity)
20310 24 : ereport(ERROR,
20311 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20312 : errmsg("table \"%s\" being attached contains an identity column \"%s\"",
20313 : RelationGetRelationName(attachrel), attributeName),
20314 : errdetail("The new partition may not contain an identity column."));
20315 :
20316 : /* Try to find the column in parent (matching on column name) */
20317 5980 : if (!SearchSysCacheExists2(ATTNAME,
20318 : ObjectIdGetDatum(RelationGetRelid(rel)),
20319 : CStringGetDatum(attributeName)))
20320 18 : ereport(ERROR,
20321 : (errcode(ERRCODE_DATATYPE_MISMATCH),
20322 : errmsg("table \"%s\" contains column \"%s\" not found in parent \"%s\"",
20323 : RelationGetRelationName(attachrel), attributeName,
20324 : RelationGetRelationName(rel)),
20325 : errdetail("The new partition may contain only the columns present in parent.")));
20326 : }
20327 :
20328 : /*
20329 : * If child_rel has row-level triggers with transition tables, we
20330 : * currently don't allow it to become a partition. See also prohibitions
20331 : * in ATExecAddInherit() and CreateTrigger().
20332 : */
20333 2682 : trigger_name = FindTriggerIncompatibleWithInheritance(attachrel->trigdesc);
20334 2682 : if (trigger_name != NULL)
20335 6 : ereport(ERROR,
20336 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
20337 : errmsg("trigger \"%s\" prevents table \"%s\" from becoming a partition",
20338 : trigger_name, RelationGetRelationName(attachrel)),
20339 : errdetail("ROW triggers with transition tables are not supported on partitions.")));
20340 :
20341 : /*
20342 : * Check that the new partition's bound is valid and does not overlap any
20343 : * of existing partitions of the parent - note that it does not return on
20344 : * error.
20345 : */
20346 2676 : check_new_partition_bound(RelationGetRelationName(attachrel), rel,
20347 : cmd->bound, pstate);
20348 :
20349 : /* OK to create inheritance. Rest of the checks performed there */
20350 2640 : CreateInheritance(attachrel, rel, true);
20351 :
20352 : /* Update the pg_class entry. */
20353 2532 : StorePartitionBound(attachrel, rel, cmd->bound);
20354 :
20355 : /* Ensure there exists a correct set of indexes in the partition. */
20356 2532 : AttachPartitionEnsureIndexes(wqueue, rel, attachrel);
20357 :
20358 : /* and triggers */
20359 2502 : CloneRowTriggersToPartition(rel, attachrel);
20360 :
20361 : /*
20362 : * Clone foreign key constraints. Callee is responsible for setting up
20363 : * for phase 3 constraint verification.
20364 : */
20365 2496 : CloneForeignKeyConstraints(wqueue, rel, attachrel);
20366 :
20367 : /*
20368 : * Generate partition constraint from the partition bound specification.
20369 : * If the parent itself is a partition, make sure to include its
20370 : * constraint as well.
20371 : */
20372 2478 : partBoundConstraint = get_qual_from_partbound(rel, cmd->bound);
20373 :
20374 : /*
20375 : * Use list_concat_copy() to avoid modifying partBoundConstraint in place,
20376 : * since it's needed later to construct the constraint expression for
20377 : * validating against the default partition, if any.
20378 : */
20379 2478 : partConstraint = list_concat_copy(partBoundConstraint,
20380 2478 : RelationGetPartitionQual(rel));
20381 :
20382 : /* Skip validation if there are no constraints to validate. */
20383 2478 : if (partConstraint)
20384 : {
20385 : /*
20386 : * Run the partition quals through const-simplification similar to
20387 : * check constraints. We skip canonicalize_qual, though, because
20388 : * partition quals should be in canonical form already.
20389 : */
20390 : partConstraint =
20391 2428 : (List *) eval_const_expressions(NULL,
20392 : (Node *) partConstraint);
20393 :
20394 : /* XXX this sure looks wrong */
20395 2428 : partConstraint = list_make1(make_ands_explicit(partConstraint));
20396 :
20397 : /*
20398 : * Adjust the generated constraint to match this partition's attribute
20399 : * numbers.
20400 : */
20401 2428 : partConstraint = map_partition_varattnos(partConstraint, 1, attachrel,
20402 : rel);
20403 :
20404 : /* Validate partition constraints against the table being attached. */
20405 2428 : QueuePartitionConstraintValidation(wqueue, attachrel, partConstraint,
20406 : false);
20407 : }
20408 :
20409 : /*
20410 : * If we're attaching a partition other than the default partition and a
20411 : * default one exists, then that partition's partition constraint changes,
20412 : * so add an entry to the work queue to validate it, too. (We must not do
20413 : * this when the partition being attached is the default one; we already
20414 : * did it above!)
20415 : */
20416 2478 : if (OidIsValid(defaultPartOid))
20417 : {
20418 : Relation defaultrel;
20419 : List *defPartConstraint;
20420 :
20421 : Assert(!cmd->bound->is_default);
20422 :
20423 : /* we already hold a lock on the default partition */
20424 148 : defaultrel = table_open(defaultPartOid, NoLock);
20425 : defPartConstraint =
20426 148 : get_proposed_default_constraint(partBoundConstraint);
20427 :
20428 : /*
20429 : * Map the Vars in the constraint expression from rel's attnos to
20430 : * defaultrel's.
20431 : */
20432 : defPartConstraint =
20433 148 : map_partition_varattnos(defPartConstraint,
20434 : 1, defaultrel, rel);
20435 148 : QueuePartitionConstraintValidation(wqueue, defaultrel,
20436 : defPartConstraint, true);
20437 :
20438 : /* keep our lock until commit. */
20439 148 : table_close(defaultrel, NoLock);
20440 : }
20441 :
20442 2478 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(attachrel));
20443 :
20444 : /*
20445 : * If the partition we just attached is partitioned itself, invalidate
20446 : * relcache for all descendent partitions too to ensure that their
20447 : * rd_partcheck expression trees are rebuilt; partitions already locked at
20448 : * the beginning of this function.
20449 : */
20450 2478 : if (attachrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
20451 : {
20452 : ListCell *l;
20453 :
20454 1124 : foreach(l, attachrel_children)
20455 : {
20456 738 : CacheInvalidateRelcacheByRelid(lfirst_oid(l));
20457 : }
20458 : }
20459 :
20460 : /* keep our lock until commit */
20461 2478 : table_close(attachrel, NoLock);
20462 :
20463 2478 : return address;
20464 : }
20465 :
20466 : /*
20467 : * AttachPartitionEnsureIndexes
20468 : * subroutine for ATExecAttachPartition to create/match indexes
20469 : *
20470 : * Enforce the indexing rule for partitioned tables during ALTER TABLE / ATTACH
20471 : * PARTITION: every partition must have an index attached to each index on the
20472 : * partitioned table.
20473 : */
20474 : static void
20475 2532 : AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
20476 : {
20477 : List *idxes;
20478 : List *attachRelIdxs;
20479 : Relation *attachrelIdxRels;
20480 : IndexInfo **attachInfos;
20481 : ListCell *cell;
20482 : MemoryContext cxt;
20483 : MemoryContext oldcxt;
20484 :
20485 2532 : cxt = AllocSetContextCreate(CurrentMemoryContext,
20486 : "AttachPartitionEnsureIndexes",
20487 : ALLOCSET_DEFAULT_SIZES);
20488 2532 : oldcxt = MemoryContextSwitchTo(cxt);
20489 :
20490 2532 : idxes = RelationGetIndexList(rel);
20491 2532 : attachRelIdxs = RelationGetIndexList(attachrel);
20492 2532 : attachrelIdxRels = palloc(sizeof(Relation) * list_length(attachRelIdxs));
20493 2532 : attachInfos = palloc(sizeof(IndexInfo *) * list_length(attachRelIdxs));
20494 :
20495 : /* Build arrays of all existing indexes and their IndexInfos */
20496 5446 : foreach_oid(cldIdxId, attachRelIdxs)
20497 : {
20498 382 : int i = foreach_current_index(cldIdxId);
20499 :
20500 382 : attachrelIdxRels[i] = index_open(cldIdxId, AccessShareLock);
20501 382 : attachInfos[i] = BuildIndexInfo(attachrelIdxRels[i]);
20502 : }
20503 :
20504 : /*
20505 : * If we're attaching a foreign table, we must fail if any of the indexes
20506 : * is a constraint index; otherwise, there's nothing to do here. Do this
20507 : * before starting work, to avoid wasting the effort of building a few
20508 : * non-unique indexes before coming across a unique one.
20509 : */
20510 2532 : if (attachrel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
20511 : {
20512 86 : foreach(cell, idxes)
20513 : {
20514 36 : Oid idx = lfirst_oid(cell);
20515 36 : Relation idxRel = index_open(idx, AccessShareLock);
20516 :
20517 36 : if (idxRel->rd_index->indisunique ||
20518 24 : idxRel->rd_index->indisprimary)
20519 12 : ereport(ERROR,
20520 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
20521 : errmsg("cannot attach foreign table \"%s\" as partition of partitioned table \"%s\"",
20522 : RelationGetRelationName(attachrel),
20523 : RelationGetRelationName(rel)),
20524 : errdetail("Partitioned table \"%s\" contains unique indexes.",
20525 : RelationGetRelationName(rel))));
20526 24 : index_close(idxRel, AccessShareLock);
20527 : }
20528 :
20529 50 : goto out;
20530 : }
20531 :
20532 : /*
20533 : * For each index on the partitioned table, find a matching one in the
20534 : * partition-to-be; if one is not found, create one.
20535 : */
20536 2902 : foreach(cell, idxes)
20537 : {
20538 450 : Oid idx = lfirst_oid(cell);
20539 450 : Relation idxRel = index_open(idx, AccessShareLock);
20540 : IndexInfo *info;
20541 : AttrMap *attmap;
20542 450 : bool found = false;
20543 : Oid constraintOid;
20544 :
20545 : /*
20546 : * Ignore indexes in the partitioned table other than partitioned
20547 : * indexes.
20548 : */
20549 450 : if (idxRel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
20550 : {
20551 0 : index_close(idxRel, AccessShareLock);
20552 0 : continue;
20553 : }
20554 :
20555 : /* construct an indexinfo to compare existing indexes against */
20556 450 : info = BuildIndexInfo(idxRel);
20557 450 : attmap = build_attrmap_by_name(RelationGetDescr(attachrel),
20558 : RelationGetDescr(rel),
20559 : false);
20560 450 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(rel), idx);
20561 :
20562 : /*
20563 : * Scan the list of existing indexes in the partition-to-be, and mark
20564 : * the first matching, valid, unattached one we find, if any, as
20565 : * partition of the parent index. If we find one, we're done.
20566 : */
20567 510 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20568 : {
20569 274 : Oid cldIdxId = RelationGetRelid(attachrelIdxRels[i]);
20570 274 : Oid cldConstrOid = InvalidOid;
20571 :
20572 : /* does this index have a parent? if so, can't use it */
20573 274 : if (attachrelIdxRels[i]->rd_rel->relispartition)
20574 12 : continue;
20575 :
20576 : /* If this index is invalid, can't use it */
20577 262 : if (!attachrelIdxRels[i]->rd_index->indisvalid)
20578 6 : continue;
20579 :
20580 256 : if (CompareIndexInfo(attachInfos[i], info,
20581 256 : attachrelIdxRels[i]->rd_indcollation,
20582 256 : idxRel->rd_indcollation,
20583 256 : attachrelIdxRels[i]->rd_opfamily,
20584 256 : idxRel->rd_opfamily,
20585 : attmap))
20586 : {
20587 : /*
20588 : * If this index is being created in the parent because of a
20589 : * constraint, then the child needs to have a constraint also,
20590 : * so look for one. If there is no such constraint, this
20591 : * index is no good, so keep looking.
20592 : */
20593 220 : if (OidIsValid(constraintOid))
20594 : {
20595 : cldConstrOid =
20596 122 : get_relation_idx_constraint_oid(RelationGetRelid(attachrel),
20597 : cldIdxId);
20598 : /* no dice */
20599 122 : if (!OidIsValid(cldConstrOid))
20600 6 : continue;
20601 :
20602 : /* Ensure they're both the same type of constraint */
20603 232 : if (get_constraint_type(constraintOid) !=
20604 116 : get_constraint_type(cldConstrOid))
20605 0 : continue;
20606 : }
20607 :
20608 : /* bingo. */
20609 214 : IndexSetParentIndex(attachrelIdxRels[i], idx);
20610 214 : if (OidIsValid(constraintOid))
20611 116 : ConstraintSetParentConstraint(cldConstrOid, constraintOid,
20612 : RelationGetRelid(attachrel));
20613 214 : found = true;
20614 :
20615 214 : CommandCounterIncrement();
20616 214 : break;
20617 : }
20618 : }
20619 :
20620 : /*
20621 : * If no suitable index was found in the partition-to-be, create one
20622 : * now. Note that if this is a PK, not-null constraints must already
20623 : * exist.
20624 : */
20625 450 : if (!found)
20626 : {
20627 : IndexStmt *stmt;
20628 : Oid conOid;
20629 :
20630 236 : stmt = generateClonedIndexStmt(NULL,
20631 : idxRel, attmap,
20632 : &conOid);
20633 236 : DefineIndex(RelationGetRelid(attachrel), stmt, InvalidOid,
20634 : RelationGetRelid(idxRel),
20635 : conOid,
20636 : -1,
20637 : true, false, false, false, false);
20638 : }
20639 :
20640 432 : index_close(idxRel, AccessShareLock);
20641 : }
20642 :
20643 2502 : out:
20644 : /* Clean up. */
20645 2872 : for (int i = 0; i < list_length(attachRelIdxs); i++)
20646 370 : index_close(attachrelIdxRels[i], AccessShareLock);
20647 2502 : MemoryContextSwitchTo(oldcxt);
20648 2502 : MemoryContextDelete(cxt);
20649 2502 : }
20650 :
20651 : /*
20652 : * CloneRowTriggersToPartition
20653 : * subroutine for ATExecAttachPartition/DefineRelation to create row
20654 : * triggers on partitions
20655 : */
20656 : static void
20657 2922 : CloneRowTriggersToPartition(Relation parent, Relation partition)
20658 : {
20659 : Relation pg_trigger;
20660 : ScanKeyData key;
20661 : SysScanDesc scan;
20662 : HeapTuple tuple;
20663 : MemoryContext perTupCxt;
20664 :
20665 2922 : ScanKeyInit(&key, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
20666 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(parent)));
20667 2922 : pg_trigger = table_open(TriggerRelationId, RowExclusiveLock);
20668 2922 : scan = systable_beginscan(pg_trigger, TriggerRelidNameIndexId,
20669 : true, NULL, 1, &key);
20670 :
20671 2922 : perTupCxt = AllocSetContextCreate(CurrentMemoryContext,
20672 : "clone trig", ALLOCSET_SMALL_SIZES);
20673 :
20674 4646 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
20675 : {
20676 1730 : Form_pg_trigger trigForm = (Form_pg_trigger) GETSTRUCT(tuple);
20677 : CreateTrigStmt *trigStmt;
20678 1730 : Node *qual = NULL;
20679 : Datum value;
20680 : bool isnull;
20681 1730 : List *cols = NIL;
20682 1730 : List *trigargs = NIL;
20683 : MemoryContext oldcxt;
20684 :
20685 : /*
20686 : * Ignore statement-level triggers; those are not cloned.
20687 : */
20688 1730 : if (!TRIGGER_FOR_ROW(trigForm->tgtype))
20689 1574 : continue;
20690 :
20691 : /*
20692 : * Don't clone internal triggers, because the constraint cloning code
20693 : * will.
20694 : */
20695 1730 : if (trigForm->tgisinternal)
20696 1574 : continue;
20697 :
20698 : /*
20699 : * Complain if we find an unexpected trigger type.
20700 : */
20701 156 : if (!TRIGGER_FOR_BEFORE(trigForm->tgtype) &&
20702 138 : !TRIGGER_FOR_AFTER(trigForm->tgtype))
20703 0 : elog(ERROR, "unexpected trigger \"%s\" found",
20704 : NameStr(trigForm->tgname));
20705 :
20706 : /* Use short-lived context for CREATE TRIGGER */
20707 156 : oldcxt = MemoryContextSwitchTo(perTupCxt);
20708 :
20709 : /*
20710 : * If there is a WHEN clause, generate a 'cooked' version of it that's
20711 : * appropriate for the partition.
20712 : */
20713 156 : value = heap_getattr(tuple, Anum_pg_trigger_tgqual,
20714 : RelationGetDescr(pg_trigger), &isnull);
20715 156 : if (!isnull)
20716 : {
20717 6 : qual = stringToNode(TextDatumGetCString(value));
20718 6 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
20719 : partition, parent);
20720 6 : qual = (Node *) map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
20721 : partition, parent);
20722 : }
20723 :
20724 : /*
20725 : * If there is a column list, transform it to a list of column names.
20726 : * Note we don't need to map this list in any way ...
20727 : */
20728 156 : if (trigForm->tgattr.dim1 > 0)
20729 : {
20730 : int i;
20731 :
20732 12 : for (i = 0; i < trigForm->tgattr.dim1; i++)
20733 : {
20734 : Form_pg_attribute col;
20735 :
20736 6 : col = TupleDescAttr(parent->rd_att,
20737 6 : trigForm->tgattr.values[i] - 1);
20738 6 : cols = lappend(cols,
20739 6 : makeString(pstrdup(NameStr(col->attname))));
20740 : }
20741 : }
20742 :
20743 : /* Reconstruct trigger arguments list. */
20744 156 : if (trigForm->tgnargs > 0)
20745 : {
20746 : char *p;
20747 :
20748 12 : value = heap_getattr(tuple, Anum_pg_trigger_tgargs,
20749 : RelationGetDescr(pg_trigger), &isnull);
20750 12 : if (isnull)
20751 0 : elog(ERROR, "tgargs is null for trigger \"%s\" in partition \"%s\"",
20752 : NameStr(trigForm->tgname), RelationGetRelationName(partition));
20753 :
20754 12 : p = (char *) VARDATA_ANY(DatumGetByteaPP(value));
20755 :
20756 36 : for (int i = 0; i < trigForm->tgnargs; i++)
20757 : {
20758 24 : trigargs = lappend(trigargs, makeString(pstrdup(p)));
20759 24 : p += strlen(p) + 1;
20760 : }
20761 : }
20762 :
20763 156 : trigStmt = makeNode(CreateTrigStmt);
20764 156 : trigStmt->replace = false;
20765 156 : trigStmt->isconstraint = OidIsValid(trigForm->tgconstraint);
20766 156 : trigStmt->trigname = NameStr(trigForm->tgname);
20767 156 : trigStmt->relation = NULL;
20768 156 : trigStmt->funcname = NULL; /* passed separately */
20769 156 : trigStmt->args = trigargs;
20770 156 : trigStmt->row = true;
20771 156 : trigStmt->timing = trigForm->tgtype & TRIGGER_TYPE_TIMING_MASK;
20772 156 : trigStmt->events = trigForm->tgtype & TRIGGER_TYPE_EVENT_MASK;
20773 156 : trigStmt->columns = cols;
20774 156 : trigStmt->whenClause = NULL; /* passed separately */
20775 156 : trigStmt->transitionRels = NIL; /* not supported at present */
20776 156 : trigStmt->deferrable = trigForm->tgdeferrable;
20777 156 : trigStmt->initdeferred = trigForm->tginitdeferred;
20778 156 : trigStmt->constrrel = NULL; /* passed separately */
20779 :
20780 156 : CreateTriggerFiringOn(trigStmt, NULL, RelationGetRelid(partition),
20781 : trigForm->tgconstrrelid, InvalidOid, InvalidOid,
20782 : trigForm->tgfoid, trigForm->oid, qual,
20783 156 : false, true, trigForm->tgenabled);
20784 :
20785 150 : MemoryContextSwitchTo(oldcxt);
20786 150 : MemoryContextReset(perTupCxt);
20787 : }
20788 :
20789 2916 : MemoryContextDelete(perTupCxt);
20790 :
20791 2916 : systable_endscan(scan);
20792 2916 : table_close(pg_trigger, RowExclusiveLock);
20793 2916 : }
20794 :
20795 : /*
20796 : * ALTER TABLE DETACH PARTITION
20797 : *
20798 : * Return the address of the relation that is no longer a partition of rel.
20799 : *
20800 : * If concurrent mode is requested, we run in two transactions. A side-
20801 : * effect is that this command cannot run in a multi-part ALTER TABLE.
20802 : * Currently, that's enforced by the grammar.
20803 : *
20804 : * The strategy for concurrency is to first modify the partition's
20805 : * pg_inherit catalog row to make it visible to everyone that the
20806 : * partition is detached, lock the partition against writes, and commit
20807 : * the transaction; anyone who requests the partition descriptor from
20808 : * that point onwards has to ignore such a partition. In a second
20809 : * transaction, we wait until all transactions that could have seen the
20810 : * partition as attached are gone, then we remove the rest of partition
20811 : * metadata (pg_inherits and pg_class.relpartbounds).
20812 : */
20813 : static ObjectAddress
20814 570 : ATExecDetachPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
20815 : RangeVar *name, bool concurrent)
20816 : {
20817 : Relation partRel;
20818 : ObjectAddress address;
20819 : Oid defaultPartOid;
20820 :
20821 : /*
20822 : * We must lock the default partition, because detaching this partition
20823 : * will change its partition constraint.
20824 : */
20825 : defaultPartOid =
20826 570 : get_default_oid_from_partdesc(RelationGetPartitionDesc(rel, true));
20827 570 : if (OidIsValid(defaultPartOid))
20828 : {
20829 : /*
20830 : * Concurrent detaching when a default partition exists is not
20831 : * supported. The main problem is that the default partition
20832 : * constraint would change. And there's a definitional problem: what
20833 : * should happen to the tuples that are being inserted that belong to
20834 : * the partition being detached? Putting them on the partition being
20835 : * detached would be wrong, since they'd become "lost" after the
20836 : * detaching completes but we cannot put them in the default partition
20837 : * either until we alter its partition constraint.
20838 : *
20839 : * I think we could solve this problem if we effected the constraint
20840 : * change before committing the first transaction. But the lock would
20841 : * have to remain AEL and it would cause concurrent query planning to
20842 : * be blocked, so changing it that way would be even worse.
20843 : */
20844 106 : if (concurrent)
20845 12 : ereport(ERROR,
20846 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20847 : errmsg("cannot detach partitions concurrently when a default partition exists")));
20848 94 : LockRelationOid(defaultPartOid, AccessExclusiveLock);
20849 : }
20850 :
20851 : /*
20852 : * In concurrent mode, the partition is locked with share-update-exclusive
20853 : * in the first transaction. This allows concurrent transactions to be
20854 : * doing DML to the partition.
20855 : */
20856 558 : partRel = table_openrv(name, concurrent ? ShareUpdateExclusiveLock :
20857 : AccessExclusiveLock);
20858 :
20859 : /*
20860 : * Check inheritance conditions and either delete the pg_inherits row (in
20861 : * non-concurrent mode) or just set the inhdetachpending flag.
20862 : */
20863 546 : if (!concurrent)
20864 400 : RemoveInheritance(partRel, rel, false);
20865 : else
20866 146 : MarkInheritDetached(partRel, rel);
20867 :
20868 : /*
20869 : * Ensure that foreign keys still hold after this detach. This keeps
20870 : * locks on the referencing tables, which prevents concurrent transactions
20871 : * from adding rows that we wouldn't see. For this to work in concurrent
20872 : * mode, it is critical that the partition appears as no longer attached
20873 : * for the RI queries as soon as the first transaction commits.
20874 : */
20875 526 : ATDetachCheckNoForeignKeyRefs(partRel);
20876 :
20877 : /*
20878 : * Concurrent mode has to work harder; first we add a new constraint to
20879 : * the partition that matches the partition constraint. Then we close our
20880 : * existing transaction, and in a new one wait for all processes to catch
20881 : * up on the catalog updates we've done so far; at that point we can
20882 : * complete the operation.
20883 : */
20884 492 : if (concurrent)
20885 : {
20886 : Oid partrelid,
20887 : parentrelid;
20888 : LOCKTAG tag;
20889 : char *parentrelname;
20890 : char *partrelname;
20891 :
20892 : /*
20893 : * Add a new constraint to the partition being detached, which
20894 : * supplants the partition constraint (unless there is one already).
20895 : */
20896 140 : DetachAddConstraintIfNeeded(wqueue, partRel);
20897 :
20898 : /*
20899 : * We're almost done now; the only traces that remain are the
20900 : * pg_inherits tuple and the partition's relpartbounds. Before we can
20901 : * remove those, we need to wait until all transactions that know that
20902 : * this is a partition are gone.
20903 : */
20904 :
20905 : /*
20906 : * Remember relation OIDs to re-acquire them later; and relation names
20907 : * too, for error messages if something is dropped in between.
20908 : */
20909 140 : partrelid = RelationGetRelid(partRel);
20910 140 : parentrelid = RelationGetRelid(rel);
20911 140 : parentrelname = MemoryContextStrdup(PortalContext,
20912 140 : RelationGetRelationName(rel));
20913 140 : partrelname = MemoryContextStrdup(PortalContext,
20914 140 : RelationGetRelationName(partRel));
20915 :
20916 : /* Invalidate relcache entries for the parent -- must be before close */
20917 140 : CacheInvalidateRelcache(rel);
20918 :
20919 140 : table_close(partRel, NoLock);
20920 140 : table_close(rel, NoLock);
20921 140 : tab->rel = NULL;
20922 :
20923 : /* Make updated catalog entry visible */
20924 140 : PopActiveSnapshot();
20925 140 : CommitTransactionCommand();
20926 :
20927 140 : StartTransactionCommand();
20928 :
20929 : /*
20930 : * Now wait. This ensures that all queries that were planned
20931 : * including the partition are finished before we remove the rest of
20932 : * catalog entries. We don't need or indeed want to acquire this
20933 : * lock, though -- that would block later queries.
20934 : *
20935 : * We don't need to concern ourselves with waiting for a lock on the
20936 : * partition itself, since we will acquire AccessExclusiveLock below.
20937 : */
20938 140 : SET_LOCKTAG_RELATION(tag, MyDatabaseId, parentrelid);
20939 140 : WaitForLockersMultiple(list_make1(&tag), AccessExclusiveLock, false);
20940 :
20941 : /*
20942 : * Now acquire locks in both relations again. Note they may have been
20943 : * removed in the meantime, so care is required.
20944 : */
20945 90 : rel = try_relation_open(parentrelid, ShareUpdateExclusiveLock);
20946 90 : partRel = try_relation_open(partrelid, AccessExclusiveLock);
20947 :
20948 : /* If the relations aren't there, something bad happened; bail out */
20949 90 : if (rel == NULL)
20950 : {
20951 0 : if (partRel != NULL) /* shouldn't happen */
20952 0 : elog(WARNING, "dangling partition \"%s\" remains, can't fix",
20953 : partrelname);
20954 0 : ereport(ERROR,
20955 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20956 : errmsg("partitioned table \"%s\" was removed concurrently",
20957 : parentrelname)));
20958 : }
20959 90 : if (partRel == NULL)
20960 0 : ereport(ERROR,
20961 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
20962 : errmsg("partition \"%s\" was removed concurrently", partrelname)));
20963 :
20964 90 : tab->rel = rel;
20965 : }
20966 :
20967 : /* Do the final part of detaching */
20968 442 : DetachPartitionFinalize(rel, partRel, concurrent, defaultPartOid);
20969 :
20970 440 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
20971 :
20972 : /* keep our lock until commit */
20973 440 : table_close(partRel, NoLock);
20974 :
20975 440 : return address;
20976 : }
20977 :
20978 : /*
20979 : * Second part of ALTER TABLE .. DETACH.
20980 : *
20981 : * This is separate so that it can be run independently when the second
20982 : * transaction of the concurrent algorithm fails (crash or abort).
20983 : */
20984 : static void
20985 456 : DetachPartitionFinalize(Relation rel, Relation partRel, bool concurrent,
20986 : Oid defaultPartOid)
20987 : {
20988 : Relation classRel;
20989 : List *fks;
20990 : ListCell *cell;
20991 : List *indexes;
20992 : Datum new_val[Natts_pg_class];
20993 : bool new_null[Natts_pg_class],
20994 : new_repl[Natts_pg_class];
20995 : HeapTuple tuple,
20996 : newtuple;
20997 456 : Relation trigrel = NULL;
20998 456 : List *fkoids = NIL;
20999 :
21000 456 : if (concurrent)
21001 : {
21002 : /*
21003 : * We can remove the pg_inherits row now. (In the non-concurrent case,
21004 : * this was already done).
21005 : */
21006 104 : RemoveInheritance(partRel, rel, true);
21007 : }
21008 :
21009 : /* Drop any triggers that were cloned on creation/attach. */
21010 456 : DropClonedTriggersFromPartition(RelationGetRelid(partRel));
21011 :
21012 : /*
21013 : * Detach any foreign keys that are inherited. This includes creating
21014 : * additional action triggers.
21015 : */
21016 456 : fks = copyObject(RelationGetFKeyList(partRel));
21017 456 : if (fks != NIL)
21018 84 : trigrel = table_open(TriggerRelationId, RowExclusiveLock);
21019 :
21020 : /*
21021 : * It's possible that the partition being detached has a foreign key that
21022 : * references a partitioned table. When that happens, there are multiple
21023 : * pg_constraint rows for the partition: one points to the partitioned
21024 : * table itself, while the others point to each of its partitions. Only
21025 : * the topmost one is to be considered here; the child constraints must be
21026 : * left alone, because conceptually those aren't coming from our parent
21027 : * partitioned table, but from this partition itself.
21028 : *
21029 : * We implement this by collecting all the constraint OIDs in a first scan
21030 : * of the FK array, and skipping in the loop below those constraints whose
21031 : * parents are listed here.
21032 : */
21033 1080 : foreach_node(ForeignKeyCacheInfo, fk, fks)
21034 168 : fkoids = lappend_oid(fkoids, fk->conoid);
21035 :
21036 624 : foreach(cell, fks)
21037 : {
21038 168 : ForeignKeyCacheInfo *fk = lfirst(cell);
21039 : HeapTuple contup;
21040 : Form_pg_constraint conform;
21041 :
21042 168 : contup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(fk->conoid));
21043 168 : if (!HeapTupleIsValid(contup))
21044 0 : elog(ERROR, "cache lookup failed for constraint %u", fk->conoid);
21045 168 : conform = (Form_pg_constraint) GETSTRUCT(contup);
21046 :
21047 : /*
21048 : * Consider only inherited foreign keys, and only if their parents
21049 : * aren't in the list.
21050 : */
21051 168 : if (conform->contype != CONSTRAINT_FOREIGN ||
21052 312 : !OidIsValid(conform->conparentid) ||
21053 144 : list_member_oid(fkoids, conform->conparentid))
21054 : {
21055 66 : ReleaseSysCache(contup);
21056 66 : continue;
21057 : }
21058 :
21059 : /*
21060 : * The constraint on this table must be marked no longer a child of
21061 : * the parent's constraint, as do its check triggers.
21062 : */
21063 102 : ConstraintSetParentConstraint(fk->conoid, InvalidOid, InvalidOid);
21064 :
21065 : /*
21066 : * Also, look up the partition's "check" triggers corresponding to the
21067 : * ENFORCED constraint being detached and detach them from the parent
21068 : * triggers. NOT ENFORCED constraints do not have these triggers;
21069 : * therefore, this step is not needed.
21070 : */
21071 102 : if (fk->conenforced)
21072 : {
21073 : Oid insertTriggerOid,
21074 : updateTriggerOid;
21075 :
21076 102 : GetForeignKeyCheckTriggers(trigrel,
21077 : fk->conoid, fk->confrelid, fk->conrelid,
21078 : &insertTriggerOid, &updateTriggerOid);
21079 : Assert(OidIsValid(insertTriggerOid));
21080 102 : TriggerSetParentTrigger(trigrel, insertTriggerOid, InvalidOid,
21081 : RelationGetRelid(partRel));
21082 : Assert(OidIsValid(updateTriggerOid));
21083 102 : TriggerSetParentTrigger(trigrel, updateTriggerOid, InvalidOid,
21084 : RelationGetRelid(partRel));
21085 : }
21086 :
21087 : /*
21088 : * Lastly, create the action triggers on the referenced table, using
21089 : * addFkRecurseReferenced, which requires some elaborate setup (so put
21090 : * it in a separate block). While at it, if the table is partitioned,
21091 : * that function will recurse to create the pg_constraint rows and
21092 : * action triggers for each partition.
21093 : *
21094 : * Note there's no need to do addFkConstraint() here, because the
21095 : * pg_constraint row already exists.
21096 : */
21097 : {
21098 : Constraint *fkconstraint;
21099 : int numfks;
21100 : AttrNumber conkey[INDEX_MAX_KEYS];
21101 : AttrNumber confkey[INDEX_MAX_KEYS];
21102 : Oid conpfeqop[INDEX_MAX_KEYS];
21103 : Oid conppeqop[INDEX_MAX_KEYS];
21104 : Oid conffeqop[INDEX_MAX_KEYS];
21105 : int numfkdelsetcols;
21106 : AttrNumber confdelsetcols[INDEX_MAX_KEYS];
21107 : Relation refdRel;
21108 :
21109 102 : DeconstructFkConstraintRow(contup,
21110 : &numfks,
21111 : conkey,
21112 : confkey,
21113 : conpfeqop,
21114 : conppeqop,
21115 : conffeqop,
21116 : &numfkdelsetcols,
21117 : confdelsetcols);
21118 :
21119 : /* Create a synthetic node we'll use throughout */
21120 102 : fkconstraint = makeNode(Constraint);
21121 102 : fkconstraint->contype = CONSTRAINT_FOREIGN;
21122 102 : fkconstraint->conname = pstrdup(NameStr(conform->conname));
21123 102 : fkconstraint->deferrable = conform->condeferrable;
21124 102 : fkconstraint->initdeferred = conform->condeferred;
21125 102 : fkconstraint->is_enforced = conform->conenforced;
21126 102 : fkconstraint->skip_validation = true;
21127 102 : fkconstraint->initially_valid = conform->convalidated;
21128 : /* a few irrelevant fields omitted here */
21129 102 : fkconstraint->pktable = NULL;
21130 102 : fkconstraint->fk_attrs = NIL;
21131 102 : fkconstraint->pk_attrs = NIL;
21132 102 : fkconstraint->fk_matchtype = conform->confmatchtype;
21133 102 : fkconstraint->fk_upd_action = conform->confupdtype;
21134 102 : fkconstraint->fk_del_action = conform->confdeltype;
21135 102 : fkconstraint->fk_del_set_cols = NIL;
21136 102 : fkconstraint->old_conpfeqop = NIL;
21137 102 : fkconstraint->old_pktable_oid = InvalidOid;
21138 102 : fkconstraint->location = -1;
21139 :
21140 : /* set up colnames, used to generate the constraint name */
21141 252 : for (int i = 0; i < numfks; i++)
21142 : {
21143 : Form_pg_attribute att;
21144 :
21145 150 : att = TupleDescAttr(RelationGetDescr(partRel),
21146 150 : conkey[i] - 1);
21147 :
21148 150 : fkconstraint->fk_attrs = lappend(fkconstraint->fk_attrs,
21149 150 : makeString(NameStr(att->attname)));
21150 : }
21151 :
21152 102 : refdRel = table_open(fk->confrelid, ShareRowExclusiveLock);
21153 :
21154 102 : addFkRecurseReferenced(fkconstraint, partRel,
21155 : refdRel,
21156 : conform->conindid,
21157 : fk->conoid,
21158 : numfks,
21159 : confkey,
21160 : conkey,
21161 : conpfeqop,
21162 : conppeqop,
21163 : conffeqop,
21164 : numfkdelsetcols,
21165 : confdelsetcols,
21166 : true,
21167 : InvalidOid, InvalidOid,
21168 102 : conform->conperiod);
21169 102 : table_close(refdRel, NoLock); /* keep lock till end of xact */
21170 : }
21171 :
21172 102 : ReleaseSysCache(contup);
21173 : }
21174 456 : list_free_deep(fks);
21175 456 : if (trigrel)
21176 84 : table_close(trigrel, RowExclusiveLock);
21177 :
21178 : /*
21179 : * Any sub-constraints that are in the referenced-side of a larger
21180 : * constraint have to be removed. This partition is no longer part of the
21181 : * key space of the constraint.
21182 : */
21183 516 : foreach(cell, GetParentedForeignKeyRefs(partRel))
21184 : {
21185 62 : Oid constrOid = lfirst_oid(cell);
21186 : ObjectAddress constraint;
21187 :
21188 62 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21189 62 : deleteDependencyRecordsForClass(ConstraintRelationId,
21190 : constrOid,
21191 : ConstraintRelationId,
21192 : DEPENDENCY_INTERNAL);
21193 62 : CommandCounterIncrement();
21194 :
21195 62 : ObjectAddressSet(constraint, ConstraintRelationId, constrOid);
21196 62 : performDeletion(&constraint, DROP_RESTRICT, 0);
21197 : }
21198 :
21199 : /* Now we can detach indexes */
21200 454 : indexes = RelationGetIndexList(partRel);
21201 648 : foreach(cell, indexes)
21202 : {
21203 194 : Oid idxid = lfirst_oid(cell);
21204 : Oid parentidx;
21205 : Relation idx;
21206 : Oid constrOid;
21207 : Oid parentConstrOid;
21208 :
21209 194 : if (!has_superclass(idxid))
21210 12 : continue;
21211 :
21212 182 : parentidx = get_partition_parent(idxid, false);
21213 : Assert((IndexGetRelation(parentidx, false) == RelationGetRelid(rel)));
21214 :
21215 182 : idx = index_open(idxid, AccessExclusiveLock);
21216 182 : IndexSetParentIndex(idx, InvalidOid);
21217 :
21218 : /*
21219 : * If there's a constraint associated with the index, detach it too.
21220 : * Careful: it is possible for a constraint index in a partition to be
21221 : * the child of a non-constraint index, so verify whether the parent
21222 : * index does actually have a constraint.
21223 : */
21224 182 : constrOid = get_relation_idx_constraint_oid(RelationGetRelid(partRel),
21225 : idxid);
21226 182 : parentConstrOid = get_relation_idx_constraint_oid(RelationGetRelid(rel),
21227 : parentidx);
21228 182 : if (OidIsValid(parentConstrOid) && OidIsValid(constrOid))
21229 84 : ConstraintSetParentConstraint(constrOid, InvalidOid, InvalidOid);
21230 :
21231 182 : index_close(idx, NoLock);
21232 : }
21233 :
21234 : /* Update pg_class tuple */
21235 454 : classRel = table_open(RelationRelationId, RowExclusiveLock);
21236 454 : tuple = SearchSysCacheCopy1(RELOID,
21237 : ObjectIdGetDatum(RelationGetRelid(partRel)));
21238 454 : if (!HeapTupleIsValid(tuple))
21239 0 : elog(ERROR, "cache lookup failed for relation %u",
21240 : RelationGetRelid(partRel));
21241 : Assert(((Form_pg_class) GETSTRUCT(tuple))->relispartition);
21242 :
21243 : /* Clear relpartbound and reset relispartition */
21244 454 : memset(new_val, 0, sizeof(new_val));
21245 454 : memset(new_null, false, sizeof(new_null));
21246 454 : memset(new_repl, false, sizeof(new_repl));
21247 454 : new_val[Anum_pg_class_relpartbound - 1] = (Datum) 0;
21248 454 : new_null[Anum_pg_class_relpartbound - 1] = true;
21249 454 : new_repl[Anum_pg_class_relpartbound - 1] = true;
21250 454 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
21251 : new_val, new_null, new_repl);
21252 :
21253 454 : ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = false;
21254 454 : CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
21255 454 : heap_freetuple(newtuple);
21256 454 : table_close(classRel, RowExclusiveLock);
21257 :
21258 : /*
21259 : * Drop identity property from all identity columns of partition.
21260 : */
21261 1294 : for (int attno = 0; attno < RelationGetNumberOfAttributes(partRel); attno++)
21262 : {
21263 840 : Form_pg_attribute attr = TupleDescAttr(partRel->rd_att, attno);
21264 :
21265 840 : if (!attr->attisdropped && attr->attidentity)
21266 6 : ATExecDropIdentity(partRel, NameStr(attr->attname), false,
21267 : AccessExclusiveLock, true, true);
21268 : }
21269 :
21270 454 : if (OidIsValid(defaultPartOid))
21271 : {
21272 : /*
21273 : * If the relation being detached is the default partition itself,
21274 : * remove it from the parent's pg_partitioned_table entry.
21275 : *
21276 : * If not, we must invalidate default partition's relcache entry, as
21277 : * in StorePartitionBound: its partition constraint depends on every
21278 : * other partition's partition constraint.
21279 : */
21280 46 : if (RelationGetRelid(partRel) == defaultPartOid)
21281 2 : update_default_partition_oid(RelationGetRelid(rel), InvalidOid);
21282 : else
21283 44 : CacheInvalidateRelcacheByRelid(defaultPartOid);
21284 : }
21285 :
21286 : /*
21287 : * Invalidate the parent's relcache so that the partition is no longer
21288 : * included in its partition descriptor.
21289 : */
21290 454 : CacheInvalidateRelcache(rel);
21291 :
21292 : /*
21293 : * If the partition we just detached is partitioned itself, invalidate
21294 : * relcache for all descendent partitions too to ensure that their
21295 : * rd_partcheck expression trees are rebuilt; must lock partitions before
21296 : * doing so, using the same lockmode as what partRel has been locked with
21297 : * by the caller.
21298 : */
21299 454 : if (partRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
21300 : {
21301 : List *children;
21302 :
21303 62 : children = find_all_inheritors(RelationGetRelid(partRel),
21304 : AccessExclusiveLock, NULL);
21305 204 : foreach(cell, children)
21306 : {
21307 142 : CacheInvalidateRelcacheByRelid(lfirst_oid(cell));
21308 : }
21309 : }
21310 454 : }
21311 :
21312 : /*
21313 : * ALTER TABLE ... DETACH PARTITION ... FINALIZE
21314 : *
21315 : * To use when a DETACH PARTITION command previously did not run to
21316 : * completion; this completes the detaching process.
21317 : */
21318 : static ObjectAddress
21319 14 : ATExecDetachPartitionFinalize(Relation rel, RangeVar *name)
21320 : {
21321 : Relation partRel;
21322 : ObjectAddress address;
21323 14 : Snapshot snap = GetActiveSnapshot();
21324 :
21325 14 : partRel = table_openrv(name, AccessExclusiveLock);
21326 :
21327 : /*
21328 : * Wait until existing snapshots are gone. This is important if the
21329 : * second transaction of DETACH PARTITION CONCURRENTLY is canceled: the
21330 : * user could immediately run DETACH FINALIZE without actually waiting for
21331 : * existing transactions. We must not complete the detach action until
21332 : * all such queries are complete (otherwise we would present them with an
21333 : * inconsistent view of catalogs).
21334 : */
21335 14 : WaitForOlderSnapshots(snap->xmin, false);
21336 :
21337 14 : DetachPartitionFinalize(rel, partRel, true, InvalidOid);
21338 :
21339 14 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));
21340 :
21341 14 : table_close(partRel, NoLock);
21342 :
21343 14 : return address;
21344 : }
21345 :
21346 : /*
21347 : * DetachAddConstraintIfNeeded
21348 : * Subroutine for ATExecDetachPartition. Create a constraint that
21349 : * takes the place of the partition constraint, but avoid creating
21350 : * a dupe if a constraint already exists which implies the needed
21351 : * constraint.
21352 : */
21353 : static void
21354 140 : DetachAddConstraintIfNeeded(List **wqueue, Relation partRel)
21355 : {
21356 : List *constraintExpr;
21357 :
21358 140 : constraintExpr = RelationGetPartitionQual(partRel);
21359 140 : constraintExpr = (List *) eval_const_expressions(NULL, (Node *) constraintExpr);
21360 :
21361 : /*
21362 : * Avoid adding a new constraint if the needed constraint is implied by an
21363 : * existing constraint
21364 : */
21365 140 : if (!PartConstraintImpliedByRelConstraint(partRel, constraintExpr))
21366 : {
21367 : AlteredTableInfo *tab;
21368 : Constraint *n;
21369 :
21370 134 : tab = ATGetQueueEntry(wqueue, partRel);
21371 :
21372 : /* Add constraint on partition, equivalent to the partition constraint */
21373 134 : n = makeNode(Constraint);
21374 134 : n->contype = CONSTR_CHECK;
21375 134 : n->conname = NULL;
21376 134 : n->location = -1;
21377 134 : n->is_no_inherit = false;
21378 134 : n->raw_expr = NULL;
21379 134 : n->cooked_expr = nodeToString(make_ands_explicit(constraintExpr));
21380 134 : n->is_enforced = true;
21381 134 : n->initially_valid = true;
21382 134 : n->skip_validation = true;
21383 : /* It's a re-add, since it nominally already exists */
21384 134 : ATAddCheckNNConstraint(wqueue, tab, partRel, n,
21385 : true, false, true, ShareUpdateExclusiveLock);
21386 : }
21387 140 : }
21388 :
21389 : /*
21390 : * DropClonedTriggersFromPartition
21391 : * subroutine for ATExecDetachPartition to remove any triggers that were
21392 : * cloned to the partition when it was created-as-partition or attached.
21393 : * This undoes what CloneRowTriggersToPartition did.
21394 : */
21395 : static void
21396 456 : DropClonedTriggersFromPartition(Oid partitionId)
21397 : {
21398 : ScanKeyData skey;
21399 : SysScanDesc scan;
21400 : HeapTuple trigtup;
21401 : Relation tgrel;
21402 : ObjectAddresses *objects;
21403 :
21404 456 : objects = new_object_addresses();
21405 :
21406 : /*
21407 : * Scan pg_trigger to search for all triggers on this rel.
21408 : */
21409 456 : ScanKeyInit(&skey, Anum_pg_trigger_tgrelid, BTEqualStrategyNumber,
21410 : F_OIDEQ, ObjectIdGetDatum(partitionId));
21411 456 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
21412 456 : scan = systable_beginscan(tgrel, TriggerRelidNameIndexId,
21413 : true, NULL, 1, &skey);
21414 850 : while (HeapTupleIsValid(trigtup = systable_getnext(scan)))
21415 : {
21416 394 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(trigtup);
21417 : ObjectAddress trig;
21418 :
21419 : /* Ignore triggers that weren't cloned */
21420 394 : if (!OidIsValid(pg_trigger->tgparentid))
21421 376 : continue;
21422 :
21423 : /*
21424 : * Ignore internal triggers that are implementation objects of foreign
21425 : * keys, because these will be detached when the foreign keys
21426 : * themselves are.
21427 : */
21428 346 : if (OidIsValid(pg_trigger->tgconstrrelid))
21429 328 : continue;
21430 :
21431 : /*
21432 : * This is ugly, but necessary: remove the dependency markings on the
21433 : * trigger so that it can be removed.
21434 : */
21435 18 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21436 : TriggerRelationId,
21437 : DEPENDENCY_PARTITION_PRI);
21438 18 : deleteDependencyRecordsForClass(TriggerRelationId, pg_trigger->oid,
21439 : RelationRelationId,
21440 : DEPENDENCY_PARTITION_SEC);
21441 :
21442 : /* remember this trigger to remove it below */
21443 18 : ObjectAddressSet(trig, TriggerRelationId, pg_trigger->oid);
21444 18 : add_exact_object_address(&trig, objects);
21445 : }
21446 :
21447 : /* make the dependency removal visible to the deletion below */
21448 456 : CommandCounterIncrement();
21449 456 : performMultipleDeletions(objects, DROP_RESTRICT, PERFORM_DELETION_INTERNAL);
21450 :
21451 : /* done */
21452 456 : free_object_addresses(objects);
21453 456 : systable_endscan(scan);
21454 456 : table_close(tgrel, RowExclusiveLock);
21455 456 : }
21456 :
21457 : /*
21458 : * Before acquiring lock on an index, acquire the same lock on the owning
21459 : * table.
21460 : */
21461 : struct AttachIndexCallbackState
21462 : {
21463 : Oid partitionOid;
21464 : Oid parentTblOid;
21465 : bool lockedParentTbl;
21466 : };
21467 :
21468 : static void
21469 508 : RangeVarCallbackForAttachIndex(const RangeVar *rv, Oid relOid, Oid oldRelOid,
21470 : void *arg)
21471 : {
21472 : struct AttachIndexCallbackState *state;
21473 : Form_pg_class classform;
21474 : HeapTuple tuple;
21475 :
21476 508 : state = (struct AttachIndexCallbackState *) arg;
21477 :
21478 508 : if (!state->lockedParentTbl)
21479 : {
21480 488 : LockRelationOid(state->parentTblOid, AccessShareLock);
21481 488 : state->lockedParentTbl = true;
21482 : }
21483 :
21484 : /*
21485 : * If we previously locked some other heap, and the name we're looking up
21486 : * no longer refers to an index on that relation, release the now-useless
21487 : * lock. XXX maybe we should do *after* we verify whether the index does
21488 : * not actually belong to the same relation ...
21489 : */
21490 508 : if (relOid != oldRelOid && OidIsValid(state->partitionOid))
21491 : {
21492 0 : UnlockRelationOid(state->partitionOid, AccessShareLock);
21493 0 : state->partitionOid = InvalidOid;
21494 : }
21495 :
21496 : /* Didn't find a relation, so no need for locking or permission checks. */
21497 508 : if (!OidIsValid(relOid))
21498 6 : return;
21499 :
21500 502 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
21501 502 : if (!HeapTupleIsValid(tuple))
21502 0 : return; /* concurrently dropped, so nothing to do */
21503 502 : classform = (Form_pg_class) GETSTRUCT(tuple);
21504 502 : if (classform->relkind != RELKIND_PARTITIONED_INDEX &&
21505 388 : classform->relkind != RELKIND_INDEX)
21506 6 : ereport(ERROR,
21507 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21508 : errmsg("\"%s\" is not an index", rv->relname)));
21509 496 : ReleaseSysCache(tuple);
21510 :
21511 : /*
21512 : * Since we need only examine the heap's tupledesc, an access share lock
21513 : * on it (preventing any DDL) is sufficient.
21514 : */
21515 496 : state->partitionOid = IndexGetRelation(relOid, false);
21516 496 : LockRelationOid(state->partitionOid, AccessShareLock);
21517 : }
21518 :
21519 : /*
21520 : * ALTER INDEX i1 ATTACH PARTITION i2
21521 : */
21522 : static ObjectAddress
21523 488 : ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx, RangeVar *name)
21524 : {
21525 : Relation partIdx;
21526 : Relation partTbl;
21527 : Relation parentTbl;
21528 : ObjectAddress address;
21529 : Oid partIdxId;
21530 : Oid currParent;
21531 : struct AttachIndexCallbackState state;
21532 :
21533 : /*
21534 : * We need to obtain lock on the index 'name' to modify it, but we also
21535 : * need to read its owning table's tuple descriptor -- so we need to lock
21536 : * both. To avoid deadlocks, obtain lock on the table before doing so on
21537 : * the index. Furthermore, we need to examine the parent table of the
21538 : * partition, so lock that one too.
21539 : */
21540 488 : state.partitionOid = InvalidOid;
21541 488 : state.parentTblOid = parentIdx->rd_index->indrelid;
21542 488 : state.lockedParentTbl = false;
21543 : partIdxId =
21544 488 : RangeVarGetRelidExtended(name, AccessExclusiveLock, 0,
21545 : RangeVarCallbackForAttachIndex,
21546 : &state);
21547 : /* Not there? */
21548 476 : if (!OidIsValid(partIdxId))
21549 0 : ereport(ERROR,
21550 : (errcode(ERRCODE_UNDEFINED_OBJECT),
21551 : errmsg("index \"%s\" does not exist", name->relname)));
21552 :
21553 : /* no deadlock risk: RangeVarGetRelidExtended already acquired the lock */
21554 476 : partIdx = relation_open(partIdxId, AccessExclusiveLock);
21555 :
21556 : /* we already hold locks on both tables, so this is safe: */
21557 476 : parentTbl = relation_open(parentIdx->rd_index->indrelid, AccessShareLock);
21558 476 : partTbl = relation_open(partIdx->rd_index->indrelid, NoLock);
21559 :
21560 476 : ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partIdx));
21561 :
21562 : /* Silently do nothing if already in the right state */
21563 952 : currParent = partIdx->rd_rel->relispartition ?
21564 476 : get_partition_parent(partIdxId, false) : InvalidOid;
21565 476 : if (currParent != RelationGetRelid(parentIdx))
21566 : {
21567 : IndexInfo *childInfo;
21568 : IndexInfo *parentInfo;
21569 : AttrMap *attmap;
21570 : bool found;
21571 : int i;
21572 : PartitionDesc partDesc;
21573 : Oid constraintOid,
21574 452 : cldConstrId = InvalidOid;
21575 :
21576 : /*
21577 : * If this partition already has an index attached, refuse the
21578 : * operation.
21579 : */
21580 452 : refuseDupeIndexAttach(parentIdx, partIdx, partTbl);
21581 :
21582 446 : if (OidIsValid(currParent))
21583 0 : ereport(ERROR,
21584 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21585 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21586 : RelationGetRelationName(partIdx),
21587 : RelationGetRelationName(parentIdx)),
21588 : errdetail("Index \"%s\" is already attached to another index.",
21589 : RelationGetRelationName(partIdx))));
21590 :
21591 : /* Make sure it indexes a partition of the other index's table */
21592 446 : partDesc = RelationGetPartitionDesc(parentTbl, true);
21593 446 : found = false;
21594 740 : for (i = 0; i < partDesc->nparts; i++)
21595 : {
21596 734 : if (partDesc->oids[i] == state.partitionOid)
21597 : {
21598 440 : found = true;
21599 440 : break;
21600 : }
21601 : }
21602 446 : if (!found)
21603 6 : ereport(ERROR,
21604 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21605 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21606 : RelationGetRelationName(partIdx),
21607 : RelationGetRelationName(parentIdx)),
21608 : errdetail("Index \"%s\" is not an index on any partition of table \"%s\".",
21609 : RelationGetRelationName(partIdx),
21610 : RelationGetRelationName(parentTbl))));
21611 :
21612 : /* Ensure the indexes are compatible */
21613 440 : childInfo = BuildIndexInfo(partIdx);
21614 440 : parentInfo = BuildIndexInfo(parentIdx);
21615 440 : attmap = build_attrmap_by_name(RelationGetDescr(partTbl),
21616 : RelationGetDescr(parentTbl),
21617 : false);
21618 440 : if (!CompareIndexInfo(childInfo, parentInfo,
21619 440 : partIdx->rd_indcollation,
21620 440 : parentIdx->rd_indcollation,
21621 440 : partIdx->rd_opfamily,
21622 440 : parentIdx->rd_opfamily,
21623 : attmap))
21624 42 : ereport(ERROR,
21625 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21626 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21627 : RelationGetRelationName(partIdx),
21628 : RelationGetRelationName(parentIdx)),
21629 : errdetail("The index definitions do not match.")));
21630 :
21631 : /*
21632 : * If there is a constraint in the parent, make sure there is one in
21633 : * the child too.
21634 : */
21635 398 : constraintOid = get_relation_idx_constraint_oid(RelationGetRelid(parentTbl),
21636 : RelationGetRelid(parentIdx));
21637 :
21638 398 : if (OidIsValid(constraintOid))
21639 : {
21640 196 : cldConstrId = get_relation_idx_constraint_oid(RelationGetRelid(partTbl),
21641 : partIdxId);
21642 196 : if (!OidIsValid(cldConstrId))
21643 6 : ereport(ERROR,
21644 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
21645 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21646 : RelationGetRelationName(partIdx),
21647 : RelationGetRelationName(parentIdx)),
21648 : errdetail("The index \"%s\" belongs to a constraint in table \"%s\" but no constraint exists for index \"%s\".",
21649 : RelationGetRelationName(parentIdx),
21650 : RelationGetRelationName(parentTbl),
21651 : RelationGetRelationName(partIdx))));
21652 : }
21653 :
21654 : /*
21655 : * If it's a primary key, make sure the columns in the partition are
21656 : * NOT NULL.
21657 : */
21658 392 : if (parentIdx->rd_index->indisprimary)
21659 166 : verifyPartitionIndexNotNull(childInfo, partTbl);
21660 :
21661 : /* All good -- do it */
21662 392 : IndexSetParentIndex(partIdx, RelationGetRelid(parentIdx));
21663 392 : if (OidIsValid(constraintOid))
21664 190 : ConstraintSetParentConstraint(cldConstrId, constraintOid,
21665 : RelationGetRelid(partTbl));
21666 :
21667 392 : free_attrmap(attmap);
21668 :
21669 392 : validatePartitionedIndex(parentIdx, parentTbl);
21670 : }
21671 :
21672 416 : relation_close(parentTbl, AccessShareLock);
21673 : /* keep these locks till commit */
21674 416 : relation_close(partTbl, NoLock);
21675 416 : relation_close(partIdx, NoLock);
21676 :
21677 416 : return address;
21678 : }
21679 :
21680 : /*
21681 : * Verify whether the given partition already contains an index attached
21682 : * to the given partitioned index. If so, raise an error.
21683 : */
21684 : static void
21685 452 : refuseDupeIndexAttach(Relation parentIdx, Relation partIdx, Relation partitionTbl)
21686 : {
21687 : Oid existingIdx;
21688 :
21689 452 : existingIdx = index_get_partition(partitionTbl,
21690 : RelationGetRelid(parentIdx));
21691 452 : if (OidIsValid(existingIdx))
21692 6 : ereport(ERROR,
21693 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
21694 : errmsg("cannot attach index \"%s\" as a partition of index \"%s\"",
21695 : RelationGetRelationName(partIdx),
21696 : RelationGetRelationName(parentIdx)),
21697 : errdetail("Another index is already attached for partition \"%s\".",
21698 : RelationGetRelationName(partitionTbl))));
21699 446 : }
21700 :
21701 : /*
21702 : * Verify whether the set of attached partition indexes to a parent index on
21703 : * a partitioned table is complete. If it is, mark the parent index valid.
21704 : *
21705 : * This should be called each time a partition index is attached.
21706 : */
21707 : static void
21708 434 : validatePartitionedIndex(Relation partedIdx, Relation partedTbl)
21709 : {
21710 : Relation inheritsRel;
21711 : SysScanDesc scan;
21712 : ScanKeyData key;
21713 434 : int tuples = 0;
21714 : HeapTuple inhTup;
21715 434 : bool updated = false;
21716 :
21717 : Assert(partedIdx->rd_rel->relkind == RELKIND_PARTITIONED_INDEX);
21718 :
21719 : /*
21720 : * Scan pg_inherits for this parent index. Count each valid index we find
21721 : * (verifying the pg_index entry for each), and if we reach the total
21722 : * amount we expect, we can mark this parent index as valid.
21723 : */
21724 434 : inheritsRel = table_open(InheritsRelationId, AccessShareLock);
21725 434 : ScanKeyInit(&key, Anum_pg_inherits_inhparent,
21726 : BTEqualStrategyNumber, F_OIDEQ,
21727 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
21728 434 : scan = systable_beginscan(inheritsRel, InheritsParentIndexId, true,
21729 : NULL, 1, &key);
21730 1162 : while ((inhTup = systable_getnext(scan)) != NULL)
21731 : {
21732 728 : Form_pg_inherits inhForm = (Form_pg_inherits) GETSTRUCT(inhTup);
21733 : HeapTuple indTup;
21734 : Form_pg_index indexForm;
21735 :
21736 728 : indTup = SearchSysCache1(INDEXRELID,
21737 : ObjectIdGetDatum(inhForm->inhrelid));
21738 728 : if (!HeapTupleIsValid(indTup))
21739 0 : elog(ERROR, "cache lookup failed for index %u", inhForm->inhrelid);
21740 728 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
21741 728 : if (indexForm->indisvalid)
21742 666 : tuples += 1;
21743 728 : ReleaseSysCache(indTup);
21744 : }
21745 :
21746 : /* Done with pg_inherits */
21747 434 : systable_endscan(scan);
21748 434 : table_close(inheritsRel, AccessShareLock);
21749 :
21750 : /*
21751 : * If we found as many inherited indexes as the partitioned table has
21752 : * partitions, we're good; update pg_index to set indisvalid.
21753 : */
21754 434 : if (tuples == RelationGetPartitionDesc(partedTbl, true)->nparts)
21755 : {
21756 : Relation idxRel;
21757 : HeapTuple indTup;
21758 : Form_pg_index indexForm;
21759 :
21760 208 : idxRel = table_open(IndexRelationId, RowExclusiveLock);
21761 208 : indTup = SearchSysCacheCopy1(INDEXRELID,
21762 : ObjectIdGetDatum(RelationGetRelid(partedIdx)));
21763 208 : if (!HeapTupleIsValid(indTup))
21764 0 : elog(ERROR, "cache lookup failed for index %u",
21765 : RelationGetRelid(partedIdx));
21766 208 : indexForm = (Form_pg_index) GETSTRUCT(indTup);
21767 :
21768 208 : indexForm->indisvalid = true;
21769 208 : updated = true;
21770 :
21771 208 : CatalogTupleUpdate(idxRel, &indTup->t_self, indTup);
21772 :
21773 208 : table_close(idxRel, RowExclusiveLock);
21774 208 : heap_freetuple(indTup);
21775 : }
21776 :
21777 : /*
21778 : * If this index is in turn a partition of a larger index, validating it
21779 : * might cause the parent to become valid also. Try that.
21780 : */
21781 434 : if (updated && partedIdx->rd_rel->relispartition)
21782 : {
21783 : Oid parentIdxId,
21784 : parentTblId;
21785 : Relation parentIdx,
21786 : parentTbl;
21787 :
21788 : /* make sure we see the validation we just did */
21789 42 : CommandCounterIncrement();
21790 :
21791 42 : parentIdxId = get_partition_parent(RelationGetRelid(partedIdx), false);
21792 42 : parentTblId = get_partition_parent(RelationGetRelid(partedTbl), false);
21793 42 : parentIdx = relation_open(parentIdxId, AccessExclusiveLock);
21794 42 : parentTbl = relation_open(parentTblId, AccessExclusiveLock);
21795 : Assert(!parentIdx->rd_index->indisvalid);
21796 :
21797 42 : validatePartitionedIndex(parentIdx, parentTbl);
21798 :
21799 42 : relation_close(parentIdx, AccessExclusiveLock);
21800 42 : relation_close(parentTbl, AccessExclusiveLock);
21801 : }
21802 434 : }
21803 :
21804 : /*
21805 : * When attaching an index as a partition of a partitioned index which is a
21806 : * primary key, verify that all the columns in the partition are marked NOT
21807 : * NULL.
21808 : */
21809 : static void
21810 166 : verifyPartitionIndexNotNull(IndexInfo *iinfo, Relation partition)
21811 : {
21812 336 : for (int i = 0; i < iinfo->ii_NumIndexKeyAttrs; i++)
21813 : {
21814 170 : Form_pg_attribute att = TupleDescAttr(RelationGetDescr(partition),
21815 170 : iinfo->ii_IndexAttrNumbers[i] - 1);
21816 :
21817 170 : if (!att->attnotnull)
21818 0 : ereport(ERROR,
21819 : errcode(ERRCODE_INVALID_TABLE_DEFINITION),
21820 : errmsg("invalid primary key definition"),
21821 : errdetail("Column \"%s\" of relation \"%s\" is not marked NOT NULL.",
21822 : NameStr(att->attname),
21823 : RelationGetRelationName(partition)));
21824 : }
21825 166 : }
21826 :
21827 : /*
21828 : * Return an OID list of constraints that reference the given relation
21829 : * that are marked as having a parent constraints.
21830 : */
21831 : static List *
21832 982 : GetParentedForeignKeyRefs(Relation partition)
21833 : {
21834 : Relation pg_constraint;
21835 : HeapTuple tuple;
21836 : SysScanDesc scan;
21837 : ScanKeyData key[2];
21838 982 : List *constraints = NIL;
21839 :
21840 : /*
21841 : * If no indexes, or no columns are referenceable by FKs, we can avoid the
21842 : * scan.
21843 : */
21844 1410 : if (RelationGetIndexList(partition) == NIL ||
21845 428 : bms_is_empty(RelationGetIndexAttrBitmap(partition,
21846 : INDEX_ATTR_BITMAP_KEY)))
21847 710 : return NIL;
21848 :
21849 : /* Search for constraints referencing this table */
21850 272 : pg_constraint = table_open(ConstraintRelationId, AccessShareLock);
21851 272 : ScanKeyInit(&key[0],
21852 : Anum_pg_constraint_confrelid, BTEqualStrategyNumber,
21853 : F_OIDEQ, ObjectIdGetDatum(RelationGetRelid(partition)));
21854 272 : ScanKeyInit(&key[1],
21855 : Anum_pg_constraint_contype, BTEqualStrategyNumber,
21856 : F_CHAREQ, CharGetDatum(CONSTRAINT_FOREIGN));
21857 :
21858 : /* XXX This is a seqscan, as we don't have a usable index */
21859 272 : scan = systable_beginscan(pg_constraint, InvalidOid, true, NULL, 2, key);
21860 444 : while ((tuple = systable_getnext(scan)) != NULL)
21861 : {
21862 172 : Form_pg_constraint constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
21863 :
21864 : /*
21865 : * We only need to process constraints that are part of larger ones.
21866 : */
21867 172 : if (!OidIsValid(constrForm->conparentid))
21868 0 : continue;
21869 :
21870 172 : constraints = lappend_oid(constraints, constrForm->oid);
21871 : }
21872 :
21873 272 : systable_endscan(scan);
21874 272 : table_close(pg_constraint, AccessShareLock);
21875 :
21876 272 : return constraints;
21877 : }
21878 :
21879 : /*
21880 : * During DETACH PARTITION, verify that any foreign keys pointing to the
21881 : * partitioned table would not become invalid. An error is raised if any
21882 : * referenced values exist.
21883 : */
21884 : static void
21885 526 : ATDetachCheckNoForeignKeyRefs(Relation partition)
21886 : {
21887 : List *constraints;
21888 : ListCell *cell;
21889 :
21890 526 : constraints = GetParentedForeignKeyRefs(partition);
21891 :
21892 602 : foreach(cell, constraints)
21893 : {
21894 110 : Oid constrOid = lfirst_oid(cell);
21895 : HeapTuple tuple;
21896 : Form_pg_constraint constrForm;
21897 : Relation rel;
21898 110 : Trigger trig = {0};
21899 :
21900 110 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
21901 110 : if (!HeapTupleIsValid(tuple))
21902 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
21903 110 : constrForm = (Form_pg_constraint) GETSTRUCT(tuple);
21904 :
21905 : Assert(OidIsValid(constrForm->conparentid));
21906 : Assert(constrForm->confrelid == RelationGetRelid(partition));
21907 :
21908 : /* prevent data changes into the referencing table until commit */
21909 110 : rel = table_open(constrForm->conrelid, ShareLock);
21910 :
21911 110 : trig.tgoid = InvalidOid;
21912 110 : trig.tgname = NameStr(constrForm->conname);
21913 110 : trig.tgenabled = TRIGGER_FIRES_ON_ORIGIN;
21914 110 : trig.tgisinternal = true;
21915 110 : trig.tgconstrrelid = RelationGetRelid(partition);
21916 110 : trig.tgconstrindid = constrForm->conindid;
21917 110 : trig.tgconstraint = constrForm->oid;
21918 110 : trig.tgdeferrable = false;
21919 110 : trig.tginitdeferred = false;
21920 : /* we needn't fill in remaining fields */
21921 :
21922 110 : RI_PartitionRemove_Check(&trig, rel, partition);
21923 :
21924 76 : ReleaseSysCache(tuple);
21925 :
21926 76 : table_close(rel, NoLock);
21927 : }
21928 492 : }
21929 :
21930 : /*
21931 : * resolve column compression specification to compression method.
21932 : */
21933 : static char
21934 257644 : GetAttributeCompression(Oid atttypid, const char *compression)
21935 : {
21936 : char cmethod;
21937 :
21938 257644 : if (compression == NULL || strcmp(compression, "default") == 0)
21939 257464 : return InvalidCompressionMethod;
21940 :
21941 : /*
21942 : * To specify a nondefault method, the column data type must be toastable.
21943 : * Note this says nothing about whether the column's attstorage setting
21944 : * permits compression; we intentionally allow attstorage and
21945 : * attcompression to be independent. But with a non-toastable type,
21946 : * attstorage could not be set to a value that would permit compression.
21947 : *
21948 : * We don't actually need to enforce this, since nothing bad would happen
21949 : * if attcompression were non-default; it would never be consulted. But
21950 : * it seems more user-friendly to complain about a certainly-useless
21951 : * attempt to set the property.
21952 : */
21953 180 : if (!TypeIsToastable(atttypid))
21954 6 : ereport(ERROR,
21955 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
21956 : errmsg("column data type %s does not support compression",
21957 : format_type_be(atttypid))));
21958 :
21959 174 : cmethod = CompressionNameToMethod(compression);
21960 174 : if (!CompressionMethodIsValid(cmethod))
21961 12 : ereport(ERROR,
21962 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
21963 : errmsg("invalid compression method \"%s\"", compression)));
21964 :
21965 162 : return cmethod;
21966 : }
21967 :
21968 : /*
21969 : * resolve column storage specification
21970 : */
21971 : static char
21972 254 : GetAttributeStorage(Oid atttypid, const char *storagemode)
21973 : {
21974 254 : char cstorage = 0;
21975 :
21976 254 : if (pg_strcasecmp(storagemode, "plain") == 0)
21977 54 : cstorage = TYPSTORAGE_PLAIN;
21978 200 : else if (pg_strcasecmp(storagemode, "external") == 0)
21979 158 : cstorage = TYPSTORAGE_EXTERNAL;
21980 42 : else if (pg_strcasecmp(storagemode, "extended") == 0)
21981 16 : cstorage = TYPSTORAGE_EXTENDED;
21982 26 : else if (pg_strcasecmp(storagemode, "main") == 0)
21983 20 : cstorage = TYPSTORAGE_MAIN;
21984 6 : else if (pg_strcasecmp(storagemode, "default") == 0)
21985 6 : cstorage = get_typstorage(atttypid);
21986 : else
21987 0 : ereport(ERROR,
21988 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
21989 : errmsg("invalid storage type \"%s\"",
21990 : storagemode)));
21991 :
21992 : /*
21993 : * safety check: do not allow toasted storage modes unless column datatype
21994 : * is TOAST-aware.
21995 : */
21996 254 : if (!(cstorage == TYPSTORAGE_PLAIN || TypeIsToastable(atttypid)))
21997 6 : ereport(ERROR,
21998 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
21999 : errmsg("column data type %s can only have storage PLAIN",
22000 : format_type_be(atttypid))));
22001 :
22002 248 : return cstorage;
22003 : }
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