Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * trigger.c
4 : * PostgreSQL TRIGGERs support code.
5 : *
6 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : * IDENTIFICATION
10 : * src/backend/commands/trigger.c
11 : *
12 : *-------------------------------------------------------------------------
13 : */
14 : #include "postgres.h"
15 :
16 : #include "access/genam.h"
17 : #include "access/htup_details.h"
18 : #include "access/relation.h"
19 : #include "access/sysattr.h"
20 : #include "access/table.h"
21 : #include "access/tableam.h"
22 : #include "access/xact.h"
23 : #include "catalog/catalog.h"
24 : #include "catalog/dependency.h"
25 : #include "catalog/indexing.h"
26 : #include "catalog/objectaccess.h"
27 : #include "catalog/partition.h"
28 : #include "catalog/pg_constraint.h"
29 : #include "catalog/pg_inherits.h"
30 : #include "catalog/pg_proc.h"
31 : #include "catalog/pg_trigger.h"
32 : #include "catalog/pg_type.h"
33 : #include "commands/dbcommands.h"
34 : #include "commands/trigger.h"
35 : #include "executor/executor.h"
36 : #include "miscadmin.h"
37 : #include "nodes/bitmapset.h"
38 : #include "nodes/makefuncs.h"
39 : #include "optimizer/optimizer.h"
40 : #include "parser/parse_clause.h"
41 : #include "parser/parse_collate.h"
42 : #include "parser/parse_func.h"
43 : #include "parser/parse_relation.h"
44 : #include "partitioning/partdesc.h"
45 : #include "pgstat.h"
46 : #include "rewrite/rewriteHandler.h"
47 : #include "rewrite/rewriteManip.h"
48 : #include "storage/lmgr.h"
49 : #include "utils/acl.h"
50 : #include "utils/builtins.h"
51 : #include "utils/fmgroids.h"
52 : #include "utils/guc_hooks.h"
53 : #include "utils/inval.h"
54 : #include "utils/lsyscache.h"
55 : #include "utils/memutils.h"
56 : #include "utils/plancache.h"
57 : #include "utils/rel.h"
58 : #include "utils/snapmgr.h"
59 : #include "utils/syscache.h"
60 : #include "utils/tuplestore.h"
61 :
62 :
63 : /* GUC variables */
64 : int SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
65 :
66 : /* How many levels deep into trigger execution are we? */
67 : static int MyTriggerDepth = 0;
68 :
69 : /* Local function prototypes */
70 : static void renametrig_internal(Relation tgrel, Relation targetrel,
71 : HeapTuple trigtup, const char *newname,
72 : const char *expected_name);
73 : static void renametrig_partition(Relation tgrel, Oid partitionId,
74 : Oid parentTriggerOid, const char *newname,
75 : const char *expected_name);
76 : static void SetTriggerFlags(TriggerDesc *trigdesc, Trigger *trigger);
77 : static bool GetTupleForTrigger(EState *estate,
78 : EPQState *epqstate,
79 : ResultRelInfo *relinfo,
80 : ItemPointer tid,
81 : LockTupleMode lockmode,
82 : TupleTableSlot *oldslot,
83 : TupleTableSlot **epqslot,
84 : TM_Result *tmresultp,
85 : TM_FailureData *tmfdp);
86 : static bool TriggerEnabled(EState *estate, ResultRelInfo *relinfo,
87 : Trigger *trigger, TriggerEvent event,
88 : Bitmapset *modifiedCols,
89 : TupleTableSlot *oldslot, TupleTableSlot *newslot);
90 : static HeapTuple ExecCallTriggerFunc(TriggerData *trigdata,
91 : int tgindx,
92 : FmgrInfo *finfo,
93 : Instrumentation *instr,
94 : MemoryContext per_tuple_context);
95 : static void AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
96 : ResultRelInfo *src_partinfo,
97 : ResultRelInfo *dst_partinfo,
98 : int event, bool row_trigger,
99 : TupleTableSlot *oldslot, TupleTableSlot *newslot,
100 : List *recheckIndexes, Bitmapset *modifiedCols,
101 : TransitionCaptureState *transition_capture,
102 : bool is_crosspart_update);
103 : static void AfterTriggerEnlargeQueryState(void);
104 : static bool before_stmt_triggers_fired(Oid relid, CmdType cmdType);
105 : static HeapTuple check_modified_virtual_generated(TupleDesc tupdesc, HeapTuple tuple);
106 :
107 :
108 : /*
109 : * Create a trigger. Returns the address of the created trigger.
110 : *
111 : * queryString is the source text of the CREATE TRIGGER command.
112 : * This must be supplied if a whenClause is specified, else it can be NULL.
113 : *
114 : * relOid, if nonzero, is the relation on which the trigger should be
115 : * created. If zero, the name provided in the statement will be looked up.
116 : *
117 : * refRelOid, if nonzero, is the relation to which the constraint trigger
118 : * refers. If zero, the constraint relation name provided in the statement
119 : * will be looked up as needed.
120 : *
121 : * constraintOid, if nonzero, says that this trigger is being created
122 : * internally to implement that constraint. A suitable pg_depend entry will
123 : * be made to link the trigger to that constraint. constraintOid is zero when
124 : * executing a user-entered CREATE TRIGGER command. (For CREATE CONSTRAINT
125 : * TRIGGER, we build a pg_constraint entry internally.)
126 : *
127 : * indexOid, if nonzero, is the OID of an index associated with the constraint.
128 : * We do nothing with this except store it into pg_trigger.tgconstrindid;
129 : * but when creating a trigger for a deferrable unique constraint on a
130 : * partitioned table, its children are looked up. Note we don't cope with
131 : * invalid indexes in that case.
132 : *
133 : * funcoid, if nonzero, is the OID of the function to invoke. When this is
134 : * given, stmt->funcname is ignored.
135 : *
136 : * parentTriggerOid, if nonzero, is a trigger that begets this one; so that
137 : * if that trigger is dropped, this one should be too. There are two cases
138 : * when a nonzero value is passed for this: 1) when this function recurses to
139 : * create the trigger on partitions, 2) when creating child foreign key
140 : * triggers; see CreateFKCheckTrigger() and createForeignKeyActionTriggers().
141 : *
142 : * If whenClause is passed, it is an already-transformed expression for
143 : * WHEN. In this case, we ignore any that may come in stmt->whenClause.
144 : *
145 : * If isInternal is true then this is an internally-generated trigger.
146 : * This argument sets the tgisinternal field of the pg_trigger entry, and
147 : * if true causes us to modify the given trigger name to ensure uniqueness.
148 : *
149 : * When isInternal is not true we require ACL_TRIGGER permissions on the
150 : * relation, as well as ACL_EXECUTE on the trigger function. For internal
151 : * triggers the caller must apply any required permission checks.
152 : *
153 : * When called on partitioned tables, this function recurses to create the
154 : * trigger on all the partitions, except if isInternal is true, in which
155 : * case caller is expected to execute recursion on its own. in_partition
156 : * indicates such a recursive call; outside callers should pass "false"
157 : * (but see CloneRowTriggersToPartition).
158 : */
159 : ObjectAddress
160 15386 : CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
161 : Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
162 : Oid funcoid, Oid parentTriggerOid, Node *whenClause,
163 : bool isInternal, bool in_partition)
164 : {
165 : return
166 15386 : CreateTriggerFiringOn(stmt, queryString, relOid, refRelOid,
167 : constraintOid, indexOid, funcoid,
168 : parentTriggerOid, whenClause, isInternal,
169 : in_partition, TRIGGER_FIRES_ON_ORIGIN);
170 : }
171 :
172 : /*
173 : * Like the above; additionally the firing condition
174 : * (always/origin/replica/disabled) can be specified.
175 : */
176 : ObjectAddress
177 16202 : CreateTriggerFiringOn(CreateTrigStmt *stmt, const char *queryString,
178 : Oid relOid, Oid refRelOid, Oid constraintOid,
179 : Oid indexOid, Oid funcoid, Oid parentTriggerOid,
180 : Node *whenClause, bool isInternal, bool in_partition,
181 : char trigger_fires_when)
182 : {
183 : int16 tgtype;
184 : int ncolumns;
185 : int16 *columns;
186 : int2vector *tgattr;
187 : List *whenRtable;
188 : char *qual;
189 : Datum values[Natts_pg_trigger];
190 : bool nulls[Natts_pg_trigger];
191 : Relation rel;
192 : AclResult aclresult;
193 : Relation tgrel;
194 : Relation pgrel;
195 16202 : HeapTuple tuple = NULL;
196 : Oid funcrettype;
197 16202 : Oid trigoid = InvalidOid;
198 : char internaltrigname[NAMEDATALEN];
199 : char *trigname;
200 16202 : Oid constrrelid = InvalidOid;
201 : ObjectAddress myself,
202 : referenced;
203 16202 : char *oldtablename = NULL;
204 16202 : char *newtablename = NULL;
205 : bool partition_recurse;
206 16202 : bool trigger_exists = false;
207 16202 : Oid existing_constraint_oid = InvalidOid;
208 16202 : bool existing_isInternal = false;
209 16202 : bool existing_isClone = false;
210 :
211 16202 : if (OidIsValid(relOid))
212 12996 : rel = table_open(relOid, ShareRowExclusiveLock);
213 : else
214 3206 : rel = table_openrv(stmt->relation, ShareRowExclusiveLock);
215 :
216 : /*
217 : * Triggers must be on tables or views, and there are additional
218 : * relation-type-specific restrictions.
219 : */
220 16202 : if (rel->rd_rel->relkind == RELKIND_RELATION)
221 : {
222 : /* Tables can't have INSTEAD OF triggers */
223 13266 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
224 11918 : stmt->timing != TRIGGER_TYPE_AFTER)
225 18 : ereport(ERROR,
226 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
227 : errmsg("\"%s\" is a table",
228 : RelationGetRelationName(rel)),
229 : errdetail("Tables cannot have INSTEAD OF triggers.")));
230 : }
231 2936 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
232 : {
233 : /* Partitioned tables can't have INSTEAD OF triggers */
234 2622 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
235 2520 : stmt->timing != TRIGGER_TYPE_AFTER)
236 6 : ereport(ERROR,
237 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
238 : errmsg("\"%s\" is a table",
239 : RelationGetRelationName(rel)),
240 : errdetail("Tables cannot have INSTEAD OF triggers.")));
241 :
242 : /*
243 : * FOR EACH ROW triggers have further restrictions
244 : */
245 2616 : if (stmt->row)
246 : {
247 : /*
248 : * Disallow use of transition tables.
249 : *
250 : * Note that we have another restriction about transition tables
251 : * in partitions; search for 'has_superclass' below for an
252 : * explanation. The check here is just to protect from the fact
253 : * that if we allowed it here, the creation would succeed for a
254 : * partitioned table with no partitions, but would be blocked by
255 : * the other restriction when the first partition was created,
256 : * which is very unfriendly behavior.
257 : */
258 2386 : if (stmt->transitionRels != NIL)
259 6 : ereport(ERROR,
260 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
261 : errmsg("\"%s\" is a partitioned table",
262 : RelationGetRelationName(rel)),
263 : errdetail("ROW triggers with transition tables are not supported on partitioned tables.")));
264 : }
265 : }
266 314 : else if (rel->rd_rel->relkind == RELKIND_VIEW)
267 : {
268 : /*
269 : * Views can have INSTEAD OF triggers (which we check below are
270 : * row-level), or statement-level BEFORE/AFTER triggers.
271 : */
272 210 : if (stmt->timing != TRIGGER_TYPE_INSTEAD && stmt->row)
273 36 : ereport(ERROR,
274 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
275 : errmsg("\"%s\" is a view",
276 : RelationGetRelationName(rel)),
277 : errdetail("Views cannot have row-level BEFORE or AFTER triggers.")));
278 : /* Disallow TRUNCATE triggers on VIEWs */
279 174 : if (TRIGGER_FOR_TRUNCATE(stmt->events))
280 12 : ereport(ERROR,
281 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
282 : errmsg("\"%s\" is a view",
283 : RelationGetRelationName(rel)),
284 : errdetail("Views cannot have TRUNCATE triggers.")));
285 : }
286 104 : else if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
287 : {
288 104 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
289 54 : stmt->timing != TRIGGER_TYPE_AFTER)
290 0 : ereport(ERROR,
291 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
292 : errmsg("\"%s\" is a foreign table",
293 : RelationGetRelationName(rel)),
294 : errdetail("Foreign tables cannot have INSTEAD OF triggers.")));
295 :
296 : /*
297 : * We disallow constraint triggers to protect the assumption that
298 : * triggers on FKs can't be deferred. See notes with AfterTriggers
299 : * data structures, below.
300 : */
301 104 : if (stmt->isconstraint)
302 6 : ereport(ERROR,
303 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
304 : errmsg("\"%s\" is a foreign table",
305 : RelationGetRelationName(rel)),
306 : errdetail("Foreign tables cannot have constraint triggers.")));
307 : }
308 : else
309 0 : ereport(ERROR,
310 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
311 : errmsg("relation \"%s\" cannot have triggers",
312 : RelationGetRelationName(rel)),
313 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
314 :
315 16118 : if (!allowSystemTableMods && IsSystemRelation(rel))
316 2 : ereport(ERROR,
317 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
318 : errmsg("permission denied: \"%s\" is a system catalog",
319 : RelationGetRelationName(rel))));
320 :
321 16116 : if (stmt->isconstraint)
322 : {
323 : /*
324 : * We must take a lock on the target relation to protect against
325 : * concurrent drop. It's not clear that AccessShareLock is strong
326 : * enough, but we certainly need at least that much... otherwise, we
327 : * might end up creating a pg_constraint entry referencing a
328 : * nonexistent table.
329 : */
330 12338 : if (OidIsValid(refRelOid))
331 : {
332 12066 : LockRelationOid(refRelOid, AccessShareLock);
333 12066 : constrrelid = refRelOid;
334 : }
335 272 : else if (stmt->constrrel != NULL)
336 24 : constrrelid = RangeVarGetRelid(stmt->constrrel, AccessShareLock,
337 : false);
338 : }
339 :
340 : /* permission checks */
341 16116 : if (!isInternal)
342 : {
343 3936 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
344 : ACL_TRIGGER);
345 3936 : if (aclresult != ACLCHECK_OK)
346 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
347 0 : RelationGetRelationName(rel));
348 :
349 3936 : if (OidIsValid(constrrelid))
350 : {
351 42 : aclresult = pg_class_aclcheck(constrrelid, GetUserId(),
352 : ACL_TRIGGER);
353 42 : if (aclresult != ACLCHECK_OK)
354 0 : aclcheck_error(aclresult, get_relkind_objtype(get_rel_relkind(constrrelid)),
355 0 : get_rel_name(constrrelid));
356 : }
357 : }
358 :
359 : /*
360 : * When called on a partitioned table to create a FOR EACH ROW trigger
361 : * that's not internal, we create one trigger for each partition, too.
362 : *
363 : * For that, we'd better hold lock on all of them ahead of time.
364 : */
365 19046 : partition_recurse = !isInternal && stmt->row &&
366 2930 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE;
367 16116 : if (partition_recurse)
368 398 : list_free(find_all_inheritors(RelationGetRelid(rel),
369 : ShareRowExclusiveLock, NULL));
370 :
371 : /* Compute tgtype */
372 16116 : TRIGGER_CLEAR_TYPE(tgtype);
373 16116 : if (stmt->row)
374 15110 : TRIGGER_SETT_ROW(tgtype);
375 16116 : tgtype |= stmt->timing;
376 16116 : tgtype |= stmt->events;
377 :
378 : /* Disallow ROW-level TRUNCATE triggers */
379 16116 : if (TRIGGER_FOR_ROW(tgtype) && TRIGGER_FOR_TRUNCATE(tgtype))
380 0 : ereport(ERROR,
381 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
382 : errmsg("TRUNCATE FOR EACH ROW triggers are not supported")));
383 :
384 : /* INSTEAD triggers must be row-level, and can't have WHEN or columns */
385 16116 : if (TRIGGER_FOR_INSTEAD(tgtype))
386 : {
387 120 : if (!TRIGGER_FOR_ROW(tgtype))
388 6 : ereport(ERROR,
389 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
390 : errmsg("INSTEAD OF triggers must be FOR EACH ROW")));
391 114 : if (stmt->whenClause)
392 6 : ereport(ERROR,
393 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
394 : errmsg("INSTEAD OF triggers cannot have WHEN conditions")));
395 108 : if (stmt->columns != NIL)
396 6 : ereport(ERROR,
397 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
398 : errmsg("INSTEAD OF triggers cannot have column lists")));
399 : }
400 :
401 : /*
402 : * We don't yet support naming ROW transition variables, but the parser
403 : * recognizes the syntax so we can give a nicer message here.
404 : *
405 : * Per standard, REFERENCING TABLE names are only allowed on AFTER
406 : * triggers. Per standard, REFERENCING ROW names are not allowed with FOR
407 : * EACH STATEMENT. Per standard, each OLD/NEW, ROW/TABLE permutation is
408 : * only allowed once. Per standard, OLD may not be specified when
409 : * creating a trigger only for INSERT, and NEW may not be specified when
410 : * creating a trigger only for DELETE.
411 : *
412 : * Notice that the standard allows an AFTER ... FOR EACH ROW trigger to
413 : * reference both ROW and TABLE transition data.
414 : */
415 16098 : if (stmt->transitionRels != NIL)
416 : {
417 448 : List *varList = stmt->transitionRels;
418 : ListCell *lc;
419 :
420 974 : foreach(lc, varList)
421 : {
422 574 : TriggerTransition *tt = lfirst_node(TriggerTransition, lc);
423 :
424 574 : if (!(tt->isTable))
425 0 : ereport(ERROR,
426 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
427 : errmsg("ROW variable naming in the REFERENCING clause is not supported"),
428 : errhint("Use OLD TABLE or NEW TABLE for naming transition tables.")));
429 :
430 : /*
431 : * Because of the above test, we omit further ROW-related testing
432 : * below. If we later allow naming OLD and NEW ROW variables,
433 : * adjustments will be needed below.
434 : */
435 :
436 574 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
437 6 : ereport(ERROR,
438 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
439 : errmsg("\"%s\" is a foreign table",
440 : RelationGetRelationName(rel)),
441 : errdetail("Triggers on foreign tables cannot have transition tables.")));
442 :
443 568 : if (rel->rd_rel->relkind == RELKIND_VIEW)
444 6 : ereport(ERROR,
445 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
446 : errmsg("\"%s\" is a view",
447 : RelationGetRelationName(rel)),
448 : errdetail("Triggers on views cannot have transition tables.")));
449 :
450 : /*
451 : * We currently don't allow row-level triggers with transition
452 : * tables on partition or inheritance children. Such triggers
453 : * would somehow need to see tuples converted to the format of the
454 : * table they're attached to, and it's not clear which subset of
455 : * tuples each child should see. See also the prohibitions in
456 : * ATExecAttachPartition() and ATExecAddInherit().
457 : */
458 562 : if (TRIGGER_FOR_ROW(tgtype) && has_superclass(rel->rd_id))
459 : {
460 : /* Use appropriate error message. */
461 12 : if (rel->rd_rel->relispartition)
462 6 : ereport(ERROR,
463 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
464 : errmsg("ROW triggers with transition tables are not supported on partitions")));
465 : else
466 6 : ereport(ERROR,
467 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
468 : errmsg("ROW triggers with transition tables are not supported on inheritance children")));
469 : }
470 :
471 550 : if (stmt->timing != TRIGGER_TYPE_AFTER)
472 0 : ereport(ERROR,
473 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
474 : errmsg("transition table name can only be specified for an AFTER trigger")));
475 :
476 550 : if (TRIGGER_FOR_TRUNCATE(tgtype))
477 6 : ereport(ERROR,
478 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
479 : errmsg("TRUNCATE triggers with transition tables are not supported")));
480 :
481 : /*
482 : * We currently don't allow multi-event triggers ("INSERT OR
483 : * UPDATE") with transition tables, because it's not clear how to
484 : * handle INSERT ... ON CONFLICT statements which can fire both
485 : * INSERT and UPDATE triggers. We show the inserted tuples to
486 : * INSERT triggers and the updated tuples to UPDATE triggers, but
487 : * it's not yet clear what INSERT OR UPDATE trigger should see.
488 : * This restriction could be lifted if we can decide on the right
489 : * semantics in a later release.
490 : */
491 544 : if (((TRIGGER_FOR_INSERT(tgtype) ? 1 : 0) +
492 544 : (TRIGGER_FOR_UPDATE(tgtype) ? 1 : 0) +
493 544 : (TRIGGER_FOR_DELETE(tgtype) ? 1 : 0)) != 1)
494 6 : ereport(ERROR,
495 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
496 : errmsg("transition tables cannot be specified for triggers with more than one event")));
497 :
498 : /*
499 : * We currently don't allow column-specific triggers with
500 : * transition tables. Per spec, that seems to require
501 : * accumulating separate transition tables for each combination of
502 : * columns, which is a lot of work for a rather marginal feature.
503 : */
504 538 : if (stmt->columns != NIL)
505 6 : ereport(ERROR,
506 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
507 : errmsg("transition tables cannot be specified for triggers with column lists")));
508 :
509 : /*
510 : * We disallow constraint triggers with transition tables, to
511 : * protect the assumption that such triggers can't be deferred.
512 : * See notes with AfterTriggers data structures, below.
513 : *
514 : * Currently this is enforced by the grammar, so just Assert here.
515 : */
516 : Assert(!stmt->isconstraint);
517 :
518 532 : if (tt->isNew)
519 : {
520 282 : if (!(TRIGGER_FOR_INSERT(tgtype) ||
521 152 : TRIGGER_FOR_UPDATE(tgtype)))
522 0 : ereport(ERROR,
523 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
524 : errmsg("NEW TABLE can only be specified for an INSERT or UPDATE trigger")));
525 :
526 282 : if (newtablename != NULL)
527 0 : ereport(ERROR,
528 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
529 : errmsg("NEW TABLE cannot be specified multiple times")));
530 :
531 282 : newtablename = tt->name;
532 : }
533 : else
534 : {
535 250 : if (!(TRIGGER_FOR_DELETE(tgtype) ||
536 146 : TRIGGER_FOR_UPDATE(tgtype)))
537 6 : ereport(ERROR,
538 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
539 : errmsg("OLD TABLE can only be specified for a DELETE or UPDATE trigger")));
540 :
541 244 : if (oldtablename != NULL)
542 0 : ereport(ERROR,
543 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
544 : errmsg("OLD TABLE cannot be specified multiple times")));
545 :
546 244 : oldtablename = tt->name;
547 : }
548 : }
549 :
550 400 : if (newtablename != NULL && oldtablename != NULL &&
551 126 : strcmp(newtablename, oldtablename) == 0)
552 0 : ereport(ERROR,
553 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
554 : errmsg("OLD TABLE name and NEW TABLE name cannot be the same")));
555 : }
556 :
557 : /*
558 : * Parse the WHEN clause, if any and we weren't passed an already
559 : * transformed one.
560 : *
561 : * Note that as a side effect, we fill whenRtable when parsing. If we got
562 : * an already parsed clause, this does not occur, which is what we want --
563 : * no point in adding redundant dependencies below.
564 : */
565 16050 : if (!whenClause && stmt->whenClause)
566 136 : {
567 : ParseState *pstate;
568 : ParseNamespaceItem *nsitem;
569 : List *varList;
570 : ListCell *lc;
571 :
572 : /* Set up a pstate to parse with */
573 184 : pstate = make_parsestate(NULL);
574 184 : pstate->p_sourcetext = queryString;
575 :
576 : /*
577 : * Set up nsitems for OLD and NEW references.
578 : *
579 : * 'OLD' must always have varno equal to 1 and 'NEW' equal to 2.
580 : */
581 184 : nsitem = addRangeTableEntryForRelation(pstate, rel,
582 : AccessShareLock,
583 : makeAlias("old", NIL),
584 : false, false);
585 184 : addNSItemToQuery(pstate, nsitem, false, true, true);
586 184 : nsitem = addRangeTableEntryForRelation(pstate, rel,
587 : AccessShareLock,
588 : makeAlias("new", NIL),
589 : false, false);
590 184 : addNSItemToQuery(pstate, nsitem, false, true, true);
591 :
592 : /* Transform expression. Copy to be sure we don't modify original */
593 184 : whenClause = transformWhereClause(pstate,
594 184 : copyObject(stmt->whenClause),
595 : EXPR_KIND_TRIGGER_WHEN,
596 : "WHEN");
597 : /* we have to fix its collations too */
598 184 : assign_expr_collations(pstate, whenClause);
599 :
600 : /*
601 : * Check for disallowed references to OLD/NEW.
602 : *
603 : * NB: pull_var_clause is okay here only because we don't allow
604 : * subselects in WHEN clauses; it would fail to examine the contents
605 : * of subselects.
606 : */
607 184 : varList = pull_var_clause(whenClause, 0);
608 364 : foreach(lc, varList)
609 : {
610 228 : Var *var = (Var *) lfirst(lc);
611 :
612 228 : switch (var->varno)
613 : {
614 86 : case PRS2_OLD_VARNO:
615 86 : if (!TRIGGER_FOR_ROW(tgtype))
616 6 : ereport(ERROR,
617 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
618 : errmsg("statement trigger's WHEN condition cannot reference column values"),
619 : parser_errposition(pstate, var->location)));
620 80 : if (TRIGGER_FOR_INSERT(tgtype))
621 6 : ereport(ERROR,
622 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
623 : errmsg("INSERT trigger's WHEN condition cannot reference OLD values"),
624 : parser_errposition(pstate, var->location)));
625 : /* system columns are okay here */
626 74 : break;
627 142 : case PRS2_NEW_VARNO:
628 142 : if (!TRIGGER_FOR_ROW(tgtype))
629 0 : ereport(ERROR,
630 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
631 : errmsg("statement trigger's WHEN condition cannot reference column values"),
632 : parser_errposition(pstate, var->location)));
633 142 : if (TRIGGER_FOR_DELETE(tgtype))
634 6 : ereport(ERROR,
635 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
636 : errmsg("DELETE trigger's WHEN condition cannot reference NEW values"),
637 : parser_errposition(pstate, var->location)));
638 136 : if (var->varattno < 0 && TRIGGER_FOR_BEFORE(tgtype))
639 6 : ereport(ERROR,
640 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
641 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW system columns"),
642 : parser_errposition(pstate, var->location)));
643 130 : if (TRIGGER_FOR_BEFORE(tgtype) &&
644 52 : var->varattno == 0 &&
645 18 : RelationGetDescr(rel)->constr &&
646 12 : (RelationGetDescr(rel)->constr->has_generated_stored ||
647 6 : RelationGetDescr(rel)->constr->has_generated_virtual))
648 12 : ereport(ERROR,
649 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
650 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW generated columns"),
651 : errdetail("A whole-row reference is used and the table contains generated columns."),
652 : parser_errposition(pstate, var->location)));
653 118 : if (TRIGGER_FOR_BEFORE(tgtype) &&
654 40 : var->varattno > 0 &&
655 34 : TupleDescAttr(RelationGetDescr(rel), var->varattno - 1)->attgenerated)
656 12 : ereport(ERROR,
657 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
658 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW generated columns"),
659 : errdetail("Column \"%s\" is a generated column.",
660 : NameStr(TupleDescAttr(RelationGetDescr(rel), var->varattno - 1)->attname)),
661 : parser_errposition(pstate, var->location)));
662 106 : break;
663 0 : default:
664 : /* can't happen without add_missing_from, so just elog */
665 0 : elog(ERROR, "trigger WHEN condition cannot contain references to other relations");
666 : break;
667 : }
668 : }
669 :
670 : /* we'll need the rtable for recordDependencyOnExpr */
671 136 : whenRtable = pstate->p_rtable;
672 :
673 136 : qual = nodeToString(whenClause);
674 :
675 136 : free_parsestate(pstate);
676 : }
677 15866 : else if (!whenClause)
678 : {
679 15824 : whenClause = NULL;
680 15824 : whenRtable = NIL;
681 15824 : qual = NULL;
682 : }
683 : else
684 : {
685 42 : qual = nodeToString(whenClause);
686 42 : whenRtable = NIL;
687 : }
688 :
689 : /*
690 : * Find and validate the trigger function.
691 : */
692 16002 : if (!OidIsValid(funcoid))
693 15186 : funcoid = LookupFuncName(stmt->funcname, 0, NULL, false);
694 16002 : if (!isInternal)
695 : {
696 3822 : aclresult = object_aclcheck(ProcedureRelationId, funcoid, GetUserId(), ACL_EXECUTE);
697 3822 : if (aclresult != ACLCHECK_OK)
698 0 : aclcheck_error(aclresult, OBJECT_FUNCTION,
699 0 : NameListToString(stmt->funcname));
700 : }
701 16002 : funcrettype = get_func_rettype(funcoid);
702 16002 : if (funcrettype != TRIGGEROID)
703 0 : ereport(ERROR,
704 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
705 : errmsg("function %s must return type %s",
706 : NameListToString(stmt->funcname), "trigger")));
707 :
708 : /*
709 : * Scan pg_trigger to see if there is already a trigger of the same name.
710 : * Skip this for internally generated triggers, since we'll modify the
711 : * name to be unique below.
712 : *
713 : * NOTE that this is cool only because we have ShareRowExclusiveLock on
714 : * the relation, so the trigger set won't be changing underneath us.
715 : */
716 16002 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
717 16002 : if (!isInternal)
718 : {
719 : ScanKeyData skeys[2];
720 : SysScanDesc tgscan;
721 :
722 3822 : ScanKeyInit(&skeys[0],
723 : Anum_pg_trigger_tgrelid,
724 : BTEqualStrategyNumber, F_OIDEQ,
725 : ObjectIdGetDatum(RelationGetRelid(rel)));
726 :
727 3822 : ScanKeyInit(&skeys[1],
728 : Anum_pg_trigger_tgname,
729 : BTEqualStrategyNumber, F_NAMEEQ,
730 3822 : CStringGetDatum(stmt->trigname));
731 :
732 3822 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
733 : NULL, 2, skeys);
734 :
735 : /* There should be at most one matching tuple */
736 3822 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
737 : {
738 102 : Form_pg_trigger oldtrigger = (Form_pg_trigger) GETSTRUCT(tuple);
739 :
740 102 : trigoid = oldtrigger->oid;
741 102 : existing_constraint_oid = oldtrigger->tgconstraint;
742 102 : existing_isInternal = oldtrigger->tgisinternal;
743 102 : existing_isClone = OidIsValid(oldtrigger->tgparentid);
744 102 : trigger_exists = true;
745 : /* copy the tuple to use in CatalogTupleUpdate() */
746 102 : tuple = heap_copytuple(tuple);
747 : }
748 3822 : systable_endscan(tgscan);
749 : }
750 :
751 16002 : if (!trigger_exists)
752 : {
753 : /* Generate the OID for the new trigger. */
754 15900 : trigoid = GetNewOidWithIndex(tgrel, TriggerOidIndexId,
755 : Anum_pg_trigger_oid);
756 : }
757 : else
758 : {
759 : /*
760 : * If OR REPLACE was specified, we'll replace the old trigger;
761 : * otherwise complain about the duplicate name.
762 : */
763 102 : if (!stmt->replace)
764 18 : ereport(ERROR,
765 : (errcode(ERRCODE_DUPLICATE_OBJECT),
766 : errmsg("trigger \"%s\" for relation \"%s\" already exists",
767 : stmt->trigname, RelationGetRelationName(rel))));
768 :
769 : /*
770 : * An internal trigger or a child trigger (isClone) cannot be replaced
771 : * by a user-defined trigger. However, skip this test when
772 : * in_partition, because then we're recursing from a partitioned table
773 : * and the check was made at the parent level.
774 : */
775 84 : if ((existing_isInternal || existing_isClone) &&
776 60 : !isInternal && !in_partition)
777 6 : ereport(ERROR,
778 : (errcode(ERRCODE_DUPLICATE_OBJECT),
779 : errmsg("trigger \"%s\" for relation \"%s\" is an internal or a child trigger",
780 : stmt->trigname, RelationGetRelationName(rel))));
781 :
782 : /*
783 : * It is not allowed to replace with a constraint trigger; gram.y
784 : * should have enforced this already.
785 : */
786 : Assert(!stmt->isconstraint);
787 :
788 : /*
789 : * It is not allowed to replace an existing constraint trigger,
790 : * either. (The reason for these restrictions is partly that it seems
791 : * difficult to deal with pending trigger events in such cases, and
792 : * partly that the command might imply changing the constraint's
793 : * properties as well, which doesn't seem nice.)
794 : */
795 78 : if (OidIsValid(existing_constraint_oid))
796 0 : ereport(ERROR,
797 : (errcode(ERRCODE_DUPLICATE_OBJECT),
798 : errmsg("trigger \"%s\" for relation \"%s\" is a constraint trigger",
799 : stmt->trigname, RelationGetRelationName(rel))));
800 : }
801 :
802 : /*
803 : * If it's a user-entered CREATE CONSTRAINT TRIGGER command, make a
804 : * corresponding pg_constraint entry.
805 : */
806 15978 : if (stmt->isconstraint && !OidIsValid(constraintOid))
807 : {
808 : /* Internal callers should have made their own constraints */
809 : Assert(!isInternal);
810 158 : constraintOid = CreateConstraintEntry(stmt->trigname,
811 158 : RelationGetNamespace(rel),
812 : CONSTRAINT_TRIGGER,
813 158 : stmt->deferrable,
814 158 : stmt->initdeferred,
815 : true, /* Is Enforced */
816 : true,
817 : InvalidOid, /* no parent */
818 : RelationGetRelid(rel),
819 : NULL, /* no conkey */
820 : 0,
821 : 0,
822 : InvalidOid, /* no domain */
823 : InvalidOid, /* no index */
824 : InvalidOid, /* no foreign key */
825 : NULL,
826 : NULL,
827 : NULL,
828 : NULL,
829 : 0,
830 : ' ',
831 : ' ',
832 : NULL,
833 : 0,
834 : ' ',
835 : NULL, /* no exclusion */
836 : NULL, /* no check constraint */
837 : NULL,
838 : true, /* islocal */
839 : 0, /* inhcount */
840 : true, /* noinherit */
841 : false, /* conperiod */
842 : isInternal); /* is_internal */
843 : }
844 :
845 : /*
846 : * If trigger is internally generated, modify the provided trigger name to
847 : * ensure uniqueness by appending the trigger OID. (Callers will usually
848 : * supply a simple constant trigger name in these cases.)
849 : */
850 15978 : if (isInternal)
851 : {
852 12180 : snprintf(internaltrigname, sizeof(internaltrigname),
853 : "%s_%u", stmt->trigname, trigoid);
854 12180 : trigname = internaltrigname;
855 : }
856 : else
857 : {
858 : /* user-defined trigger; use the specified trigger name as-is */
859 3798 : trigname = stmt->trigname;
860 : }
861 :
862 : /*
863 : * Build the new pg_trigger tuple.
864 : */
865 15978 : memset(nulls, false, sizeof(nulls));
866 :
867 15978 : values[Anum_pg_trigger_oid - 1] = ObjectIdGetDatum(trigoid);
868 15978 : values[Anum_pg_trigger_tgrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
869 15978 : values[Anum_pg_trigger_tgparentid - 1] = ObjectIdGetDatum(parentTriggerOid);
870 15978 : values[Anum_pg_trigger_tgname - 1] = DirectFunctionCall1(namein,
871 : CStringGetDatum(trigname));
872 15978 : values[Anum_pg_trigger_tgfoid - 1] = ObjectIdGetDatum(funcoid);
873 15978 : values[Anum_pg_trigger_tgtype - 1] = Int16GetDatum(tgtype);
874 15978 : values[Anum_pg_trigger_tgenabled - 1] = trigger_fires_when;
875 15978 : values[Anum_pg_trigger_tgisinternal - 1] = BoolGetDatum(isInternal);
876 15978 : values[Anum_pg_trigger_tgconstrrelid - 1] = ObjectIdGetDatum(constrrelid);
877 15978 : values[Anum_pg_trigger_tgconstrindid - 1] = ObjectIdGetDatum(indexOid);
878 15978 : values[Anum_pg_trigger_tgconstraint - 1] = ObjectIdGetDatum(constraintOid);
879 15978 : values[Anum_pg_trigger_tgdeferrable - 1] = BoolGetDatum(stmt->deferrable);
880 15978 : values[Anum_pg_trigger_tginitdeferred - 1] = BoolGetDatum(stmt->initdeferred);
881 :
882 15978 : if (stmt->args)
883 : {
884 : ListCell *le;
885 : char *args;
886 486 : int16 nargs = list_length(stmt->args);
887 486 : int len = 0;
888 :
889 1254 : foreach(le, stmt->args)
890 : {
891 768 : char *ar = strVal(lfirst(le));
892 :
893 768 : len += strlen(ar) + 4;
894 6256 : for (; *ar; ar++)
895 : {
896 5488 : if (*ar == '\\')
897 0 : len++;
898 : }
899 : }
900 486 : args = (char *) palloc(len + 1);
901 486 : args[0] = '\0';
902 1254 : foreach(le, stmt->args)
903 : {
904 768 : char *s = strVal(lfirst(le));
905 768 : char *d = args + strlen(args);
906 :
907 6256 : while (*s)
908 : {
909 5488 : if (*s == '\\')
910 0 : *d++ = '\\';
911 5488 : *d++ = *s++;
912 : }
913 768 : strcpy(d, "\\000");
914 : }
915 486 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(nargs);
916 486 : values[Anum_pg_trigger_tgargs - 1] = DirectFunctionCall1(byteain,
917 : CStringGetDatum(args));
918 : }
919 : else
920 : {
921 15492 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(0);
922 15492 : values[Anum_pg_trigger_tgargs - 1] = DirectFunctionCall1(byteain,
923 : CStringGetDatum(""));
924 : }
925 :
926 : /* build column number array if it's a column-specific trigger */
927 15978 : ncolumns = list_length(stmt->columns);
928 15978 : if (ncolumns == 0)
929 15872 : columns = NULL;
930 : else
931 : {
932 : ListCell *cell;
933 106 : int i = 0;
934 :
935 106 : columns = (int16 *) palloc(ncolumns * sizeof(int16));
936 220 : foreach(cell, stmt->columns)
937 : {
938 120 : char *name = strVal(lfirst(cell));
939 : int16 attnum;
940 : int j;
941 :
942 : /* Lookup column name. System columns are not allowed */
943 120 : attnum = attnameAttNum(rel, name, false);
944 120 : if (attnum == InvalidAttrNumber)
945 0 : ereport(ERROR,
946 : (errcode(ERRCODE_UNDEFINED_COLUMN),
947 : errmsg("column \"%s\" of relation \"%s\" does not exist",
948 : name, RelationGetRelationName(rel))));
949 :
950 : /* Check for duplicates */
951 128 : for (j = i - 1; j >= 0; j--)
952 : {
953 14 : if (columns[j] == attnum)
954 6 : ereport(ERROR,
955 : (errcode(ERRCODE_DUPLICATE_COLUMN),
956 : errmsg("column \"%s\" specified more than once",
957 : name)));
958 : }
959 :
960 114 : columns[i++] = attnum;
961 : }
962 : }
963 15972 : tgattr = buildint2vector(columns, ncolumns);
964 15972 : values[Anum_pg_trigger_tgattr - 1] = PointerGetDatum(tgattr);
965 :
966 : /* set tgqual if trigger has WHEN clause */
967 15972 : if (qual)
968 178 : values[Anum_pg_trigger_tgqual - 1] = CStringGetTextDatum(qual);
969 : else
970 15794 : nulls[Anum_pg_trigger_tgqual - 1] = true;
971 :
972 15972 : if (oldtablename)
973 244 : values[Anum_pg_trigger_tgoldtable - 1] = DirectFunctionCall1(namein,
974 : CStringGetDatum(oldtablename));
975 : else
976 15728 : nulls[Anum_pg_trigger_tgoldtable - 1] = true;
977 15972 : if (newtablename)
978 282 : values[Anum_pg_trigger_tgnewtable - 1] = DirectFunctionCall1(namein,
979 : CStringGetDatum(newtablename));
980 : else
981 15690 : nulls[Anum_pg_trigger_tgnewtable - 1] = true;
982 :
983 : /*
984 : * Insert or replace tuple in pg_trigger.
985 : */
986 15972 : if (!trigger_exists)
987 : {
988 15894 : tuple = heap_form_tuple(tgrel->rd_att, values, nulls);
989 15894 : CatalogTupleInsert(tgrel, tuple);
990 : }
991 : else
992 : {
993 : HeapTuple newtup;
994 :
995 78 : newtup = heap_form_tuple(tgrel->rd_att, values, nulls);
996 78 : CatalogTupleUpdate(tgrel, &tuple->t_self, newtup);
997 78 : heap_freetuple(newtup);
998 : }
999 :
1000 15972 : heap_freetuple(tuple); /* free either original or new tuple */
1001 15972 : table_close(tgrel, RowExclusiveLock);
1002 :
1003 15972 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
1004 15972 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgargs - 1]));
1005 15972 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgattr - 1]));
1006 15972 : if (oldtablename)
1007 244 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgoldtable - 1]));
1008 15972 : if (newtablename)
1009 282 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgnewtable - 1]));
1010 :
1011 : /*
1012 : * Update relation's pg_class entry; if necessary; and if not, send an SI
1013 : * message to make other backends (and this one) rebuild relcache entries.
1014 : */
1015 15972 : pgrel = table_open(RelationRelationId, RowExclusiveLock);
1016 15972 : tuple = SearchSysCacheCopy1(RELOID,
1017 : ObjectIdGetDatum(RelationGetRelid(rel)));
1018 15972 : if (!HeapTupleIsValid(tuple))
1019 0 : elog(ERROR, "cache lookup failed for relation %u",
1020 : RelationGetRelid(rel));
1021 15972 : if (!((Form_pg_class) GETSTRUCT(tuple))->relhastriggers)
1022 : {
1023 6108 : ((Form_pg_class) GETSTRUCT(tuple))->relhastriggers = true;
1024 :
1025 6108 : CatalogTupleUpdate(pgrel, &tuple->t_self, tuple);
1026 :
1027 6108 : CommandCounterIncrement();
1028 : }
1029 : else
1030 9864 : CacheInvalidateRelcacheByTuple(tuple);
1031 :
1032 15972 : heap_freetuple(tuple);
1033 15972 : table_close(pgrel, RowExclusiveLock);
1034 :
1035 : /*
1036 : * If we're replacing a trigger, flush all the old dependencies before
1037 : * recording new ones.
1038 : */
1039 15972 : if (trigger_exists)
1040 78 : deleteDependencyRecordsFor(TriggerRelationId, trigoid, true);
1041 :
1042 : /*
1043 : * Record dependencies for trigger. Always place a normal dependency on
1044 : * the function.
1045 : */
1046 15972 : myself.classId = TriggerRelationId;
1047 15972 : myself.objectId = trigoid;
1048 15972 : myself.objectSubId = 0;
1049 :
1050 15972 : referenced.classId = ProcedureRelationId;
1051 15972 : referenced.objectId = funcoid;
1052 15972 : referenced.objectSubId = 0;
1053 15972 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1054 :
1055 15972 : if (isInternal && OidIsValid(constraintOid))
1056 : {
1057 : /*
1058 : * Internally-generated trigger for a constraint, so make it an
1059 : * internal dependency of the constraint. We can skip depending on
1060 : * the relation(s), as there'll be an indirect dependency via the
1061 : * constraint.
1062 : */
1063 12180 : referenced.classId = ConstraintRelationId;
1064 12180 : referenced.objectId = constraintOid;
1065 12180 : referenced.objectSubId = 0;
1066 12180 : recordDependencyOn(&myself, &referenced, DEPENDENCY_INTERNAL);
1067 : }
1068 : else
1069 : {
1070 : /*
1071 : * User CREATE TRIGGER, so place dependencies. We make trigger be
1072 : * auto-dropped if its relation is dropped or if the FK relation is
1073 : * dropped. (Auto drop is compatible with our pre-7.3 behavior.)
1074 : */
1075 3792 : referenced.classId = RelationRelationId;
1076 3792 : referenced.objectId = RelationGetRelid(rel);
1077 3792 : referenced.objectSubId = 0;
1078 3792 : recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
1079 :
1080 3792 : if (OidIsValid(constrrelid))
1081 : {
1082 42 : referenced.classId = RelationRelationId;
1083 42 : referenced.objectId = constrrelid;
1084 42 : referenced.objectSubId = 0;
1085 42 : recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
1086 : }
1087 : /* Not possible to have an index dependency in this case */
1088 : Assert(!OidIsValid(indexOid));
1089 :
1090 : /*
1091 : * If it's a user-specified constraint trigger, make the constraint
1092 : * internally dependent on the trigger instead of vice versa.
1093 : */
1094 3792 : if (OidIsValid(constraintOid))
1095 : {
1096 158 : referenced.classId = ConstraintRelationId;
1097 158 : referenced.objectId = constraintOid;
1098 158 : referenced.objectSubId = 0;
1099 158 : recordDependencyOn(&referenced, &myself, DEPENDENCY_INTERNAL);
1100 : }
1101 :
1102 : /*
1103 : * If it's a partition trigger, create the partition dependencies.
1104 : */
1105 3792 : if (OidIsValid(parentTriggerOid))
1106 : {
1107 804 : ObjectAddressSet(referenced, TriggerRelationId, parentTriggerOid);
1108 804 : recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_PRI);
1109 804 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
1110 804 : recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_SEC);
1111 : }
1112 : }
1113 :
1114 : /* If column-specific trigger, add normal dependencies on columns */
1115 15972 : if (columns != NULL)
1116 : {
1117 : int i;
1118 :
1119 100 : referenced.classId = RelationRelationId;
1120 100 : referenced.objectId = RelationGetRelid(rel);
1121 208 : for (i = 0; i < ncolumns; i++)
1122 : {
1123 108 : referenced.objectSubId = columns[i];
1124 108 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1125 : }
1126 : }
1127 :
1128 : /*
1129 : * If it has a WHEN clause, add dependencies on objects mentioned in the
1130 : * expression (eg, functions, as well as any columns used).
1131 : */
1132 15972 : if (whenRtable != NIL)
1133 136 : recordDependencyOnExpr(&myself, whenClause, whenRtable,
1134 : DEPENDENCY_NORMAL);
1135 :
1136 : /* Post creation hook for new trigger */
1137 15972 : InvokeObjectPostCreateHookArg(TriggerRelationId, trigoid, 0,
1138 : isInternal);
1139 :
1140 : /*
1141 : * Lastly, create the trigger on child relations, if needed.
1142 : */
1143 15972 : if (partition_recurse)
1144 : {
1145 386 : PartitionDesc partdesc = RelationGetPartitionDesc(rel, true);
1146 : int i;
1147 : MemoryContext oldcxt,
1148 : perChildCxt;
1149 :
1150 386 : perChildCxt = AllocSetContextCreate(CurrentMemoryContext,
1151 : "part trig clone",
1152 : ALLOCSET_SMALL_SIZES);
1153 :
1154 : /*
1155 : * We don't currently expect to be called with a valid indexOid. If
1156 : * that ever changes then we'll need to write code here to find the
1157 : * corresponding child index.
1158 : */
1159 : Assert(!OidIsValid(indexOid));
1160 :
1161 386 : oldcxt = MemoryContextSwitchTo(perChildCxt);
1162 :
1163 : /* Iterate to create the trigger on each existing partition */
1164 1040 : for (i = 0; i < partdesc->nparts; i++)
1165 : {
1166 : CreateTrigStmt *childStmt;
1167 : Relation childTbl;
1168 : Node *qual;
1169 :
1170 660 : childTbl = table_open(partdesc->oids[i], ShareRowExclusiveLock);
1171 :
1172 : /*
1173 : * Initialize our fabricated parse node by copying the original
1174 : * one, then resetting fields that we pass separately.
1175 : */
1176 660 : childStmt = copyObject(stmt);
1177 660 : childStmt->funcname = NIL;
1178 660 : childStmt->whenClause = NULL;
1179 :
1180 : /* If there is a WHEN clause, create a modified copy of it */
1181 660 : qual = copyObject(whenClause);
1182 : qual = (Node *)
1183 660 : map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
1184 : childTbl, rel);
1185 : qual = (Node *)
1186 660 : map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
1187 : childTbl, rel);
1188 :
1189 660 : CreateTriggerFiringOn(childStmt, queryString,
1190 660 : partdesc->oids[i], refRelOid,
1191 : InvalidOid, InvalidOid,
1192 : funcoid, trigoid, qual,
1193 : isInternal, true, trigger_fires_when);
1194 :
1195 654 : table_close(childTbl, NoLock);
1196 :
1197 654 : MemoryContextReset(perChildCxt);
1198 : }
1199 :
1200 380 : MemoryContextSwitchTo(oldcxt);
1201 380 : MemoryContextDelete(perChildCxt);
1202 : }
1203 :
1204 : /* Keep lock on target rel until end of xact */
1205 15966 : table_close(rel, NoLock);
1206 :
1207 15966 : return myself;
1208 : }
1209 :
1210 : /*
1211 : * TriggerSetParentTrigger
1212 : * Set a partition's trigger as child of its parent trigger,
1213 : * or remove the linkage if parentTrigId is InvalidOid.
1214 : *
1215 : * This updates the constraint's pg_trigger row to show it as inherited, and
1216 : * adds PARTITION dependencies to prevent the trigger from being deleted
1217 : * on its own. Alternatively, reverse that.
1218 : */
1219 : void
1220 444 : TriggerSetParentTrigger(Relation trigRel,
1221 : Oid childTrigId,
1222 : Oid parentTrigId,
1223 : Oid childTableId)
1224 : {
1225 : SysScanDesc tgscan;
1226 : ScanKeyData skey[1];
1227 : Form_pg_trigger trigForm;
1228 : HeapTuple tuple,
1229 : newtup;
1230 : ObjectAddress depender;
1231 : ObjectAddress referenced;
1232 :
1233 : /*
1234 : * Find the trigger to delete.
1235 : */
1236 444 : ScanKeyInit(&skey[0],
1237 : Anum_pg_trigger_oid,
1238 : BTEqualStrategyNumber, F_OIDEQ,
1239 : ObjectIdGetDatum(childTrigId));
1240 :
1241 444 : tgscan = systable_beginscan(trigRel, TriggerOidIndexId, true,
1242 : NULL, 1, skey);
1243 :
1244 444 : tuple = systable_getnext(tgscan);
1245 444 : if (!HeapTupleIsValid(tuple))
1246 0 : elog(ERROR, "could not find tuple for trigger %u", childTrigId);
1247 444 : newtup = heap_copytuple(tuple);
1248 444 : trigForm = (Form_pg_trigger) GETSTRUCT(newtup);
1249 444 : if (OidIsValid(parentTrigId))
1250 : {
1251 : /* don't allow setting parent for a constraint that already has one */
1252 264 : if (OidIsValid(trigForm->tgparentid))
1253 0 : elog(ERROR, "trigger %u already has a parent trigger",
1254 : childTrigId);
1255 :
1256 264 : trigForm->tgparentid = parentTrigId;
1257 :
1258 264 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1259 :
1260 264 : ObjectAddressSet(depender, TriggerRelationId, childTrigId);
1261 :
1262 264 : ObjectAddressSet(referenced, TriggerRelationId, parentTrigId);
1263 264 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_PRI);
1264 :
1265 264 : ObjectAddressSet(referenced, RelationRelationId, childTableId);
1266 264 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_SEC);
1267 : }
1268 : else
1269 : {
1270 180 : trigForm->tgparentid = InvalidOid;
1271 :
1272 180 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1273 :
1274 180 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1275 : TriggerRelationId,
1276 : DEPENDENCY_PARTITION_PRI);
1277 180 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1278 : RelationRelationId,
1279 : DEPENDENCY_PARTITION_SEC);
1280 : }
1281 :
1282 444 : heap_freetuple(newtup);
1283 444 : systable_endscan(tgscan);
1284 444 : }
1285 :
1286 :
1287 : /*
1288 : * Guts of trigger deletion.
1289 : */
1290 : void
1291 13902 : RemoveTriggerById(Oid trigOid)
1292 : {
1293 : Relation tgrel;
1294 : SysScanDesc tgscan;
1295 : ScanKeyData skey[1];
1296 : HeapTuple tup;
1297 : Oid relid;
1298 : Relation rel;
1299 :
1300 13902 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1301 :
1302 : /*
1303 : * Find the trigger to delete.
1304 : */
1305 13902 : ScanKeyInit(&skey[0],
1306 : Anum_pg_trigger_oid,
1307 : BTEqualStrategyNumber, F_OIDEQ,
1308 : ObjectIdGetDatum(trigOid));
1309 :
1310 13902 : tgscan = systable_beginscan(tgrel, TriggerOidIndexId, true,
1311 : NULL, 1, skey);
1312 :
1313 13902 : tup = systable_getnext(tgscan);
1314 13902 : if (!HeapTupleIsValid(tup))
1315 0 : elog(ERROR, "could not find tuple for trigger %u", trigOid);
1316 :
1317 : /*
1318 : * Open and exclusive-lock the relation the trigger belongs to.
1319 : */
1320 13902 : relid = ((Form_pg_trigger) GETSTRUCT(tup))->tgrelid;
1321 :
1322 13902 : rel = table_open(relid, AccessExclusiveLock);
1323 :
1324 13902 : if (rel->rd_rel->relkind != RELKIND_RELATION &&
1325 2522 : rel->rd_rel->relkind != RELKIND_VIEW &&
1326 2386 : rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
1327 2294 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1328 0 : ereport(ERROR,
1329 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1330 : errmsg("relation \"%s\" cannot have triggers",
1331 : RelationGetRelationName(rel)),
1332 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
1333 :
1334 13902 : if (!allowSystemTableMods && IsSystemRelation(rel))
1335 0 : ereport(ERROR,
1336 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1337 : errmsg("permission denied: \"%s\" is a system catalog",
1338 : RelationGetRelationName(rel))));
1339 :
1340 : /*
1341 : * Delete the pg_trigger tuple.
1342 : */
1343 13902 : CatalogTupleDelete(tgrel, &tup->t_self);
1344 :
1345 13902 : systable_endscan(tgscan);
1346 13902 : table_close(tgrel, RowExclusiveLock);
1347 :
1348 : /*
1349 : * We do not bother to try to determine whether any other triggers remain,
1350 : * which would be needed in order to decide whether it's safe to clear the
1351 : * relation's relhastriggers. (In any case, there might be a concurrent
1352 : * process adding new triggers.) Instead, just force a relcache inval to
1353 : * make other backends (and this one too!) rebuild their relcache entries.
1354 : * There's no great harm in leaving relhastriggers true even if there are
1355 : * no triggers left.
1356 : */
1357 13902 : CacheInvalidateRelcache(rel);
1358 :
1359 : /* Keep lock on trigger's rel until end of xact */
1360 13902 : table_close(rel, NoLock);
1361 13902 : }
1362 :
1363 : /*
1364 : * get_trigger_oid - Look up a trigger by name to find its OID.
1365 : *
1366 : * If missing_ok is false, throw an error if trigger not found. If
1367 : * true, just return InvalidOid.
1368 : */
1369 : Oid
1370 784 : get_trigger_oid(Oid relid, const char *trigname, bool missing_ok)
1371 : {
1372 : Relation tgrel;
1373 : ScanKeyData skey[2];
1374 : SysScanDesc tgscan;
1375 : HeapTuple tup;
1376 : Oid oid;
1377 :
1378 : /*
1379 : * Find the trigger, verify permissions, set up object address
1380 : */
1381 784 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1382 :
1383 784 : ScanKeyInit(&skey[0],
1384 : Anum_pg_trigger_tgrelid,
1385 : BTEqualStrategyNumber, F_OIDEQ,
1386 : ObjectIdGetDatum(relid));
1387 784 : ScanKeyInit(&skey[1],
1388 : Anum_pg_trigger_tgname,
1389 : BTEqualStrategyNumber, F_NAMEEQ,
1390 : CStringGetDatum(trigname));
1391 :
1392 784 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1393 : NULL, 2, skey);
1394 :
1395 784 : tup = systable_getnext(tgscan);
1396 :
1397 784 : if (!HeapTupleIsValid(tup))
1398 : {
1399 30 : if (!missing_ok)
1400 24 : ereport(ERROR,
1401 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1402 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1403 : trigname, get_rel_name(relid))));
1404 6 : oid = InvalidOid;
1405 : }
1406 : else
1407 : {
1408 754 : oid = ((Form_pg_trigger) GETSTRUCT(tup))->oid;
1409 : }
1410 :
1411 760 : systable_endscan(tgscan);
1412 760 : table_close(tgrel, AccessShareLock);
1413 760 : return oid;
1414 : }
1415 :
1416 : /*
1417 : * Perform permissions and integrity checks before acquiring a relation lock.
1418 : */
1419 : static void
1420 42 : RangeVarCallbackForRenameTrigger(const RangeVar *rv, Oid relid, Oid oldrelid,
1421 : void *arg)
1422 : {
1423 : HeapTuple tuple;
1424 : Form_pg_class form;
1425 :
1426 42 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
1427 42 : if (!HeapTupleIsValid(tuple))
1428 0 : return; /* concurrently dropped */
1429 42 : form = (Form_pg_class) GETSTRUCT(tuple);
1430 :
1431 : /* only tables and views can have triggers */
1432 42 : if (form->relkind != RELKIND_RELATION && form->relkind != RELKIND_VIEW &&
1433 26 : form->relkind != RELKIND_FOREIGN_TABLE &&
1434 26 : form->relkind != RELKIND_PARTITIONED_TABLE)
1435 0 : ereport(ERROR,
1436 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1437 : errmsg("relation \"%s\" cannot have triggers",
1438 : rv->relname),
1439 : errdetail_relkind_not_supported(form->relkind)));
1440 :
1441 : /* you must own the table to rename one of its triggers */
1442 42 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
1443 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
1444 42 : if (!allowSystemTableMods && IsSystemClass(relid, form))
1445 2 : ereport(ERROR,
1446 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1447 : errmsg("permission denied: \"%s\" is a system catalog",
1448 : rv->relname)));
1449 :
1450 40 : ReleaseSysCache(tuple);
1451 : }
1452 :
1453 : /*
1454 : * renametrig - changes the name of a trigger on a relation
1455 : *
1456 : * trigger name is changed in trigger catalog.
1457 : * No record of the previous name is kept.
1458 : *
1459 : * get proper relrelation from relation catalog (if not arg)
1460 : * scan trigger catalog
1461 : * for name conflict (within rel)
1462 : * for original trigger (if not arg)
1463 : * modify tgname in trigger tuple
1464 : * update row in catalog
1465 : */
1466 : ObjectAddress
1467 40 : renametrig(RenameStmt *stmt)
1468 : {
1469 : Oid tgoid;
1470 : Relation targetrel;
1471 : Relation tgrel;
1472 : HeapTuple tuple;
1473 : SysScanDesc tgscan;
1474 : ScanKeyData key[2];
1475 : Oid relid;
1476 : ObjectAddress address;
1477 :
1478 : /*
1479 : * Look up name, check permissions, and acquire lock (which we will NOT
1480 : * release until end of transaction).
1481 : */
1482 40 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
1483 : 0,
1484 : RangeVarCallbackForRenameTrigger,
1485 : NULL);
1486 :
1487 : /* Have lock already, so just need to build relcache entry. */
1488 38 : targetrel = relation_open(relid, NoLock);
1489 :
1490 : /*
1491 : * On partitioned tables, this operation recurses to partitions. Lock all
1492 : * tables upfront.
1493 : */
1494 38 : if (targetrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1495 24 : (void) find_all_inheritors(relid, AccessExclusiveLock, NULL);
1496 :
1497 38 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1498 :
1499 : /*
1500 : * Search for the trigger to modify.
1501 : */
1502 38 : ScanKeyInit(&key[0],
1503 : Anum_pg_trigger_tgrelid,
1504 : BTEqualStrategyNumber, F_OIDEQ,
1505 : ObjectIdGetDatum(relid));
1506 38 : ScanKeyInit(&key[1],
1507 : Anum_pg_trigger_tgname,
1508 : BTEqualStrategyNumber, F_NAMEEQ,
1509 38 : PointerGetDatum(stmt->subname));
1510 38 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1511 : NULL, 2, key);
1512 38 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1513 : {
1514 : Form_pg_trigger trigform;
1515 :
1516 38 : trigform = (Form_pg_trigger) GETSTRUCT(tuple);
1517 38 : tgoid = trigform->oid;
1518 :
1519 : /*
1520 : * If the trigger descends from a trigger on a parent partitioned
1521 : * table, reject the rename. We don't allow a trigger in a partition
1522 : * to differ in name from that of its parent: that would lead to an
1523 : * inconsistency that pg_dump would not reproduce.
1524 : */
1525 38 : if (OidIsValid(trigform->tgparentid))
1526 6 : ereport(ERROR,
1527 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1528 : errmsg("cannot rename trigger \"%s\" on table \"%s\"",
1529 : stmt->subname, RelationGetRelationName(targetrel)),
1530 : errhint("Rename the trigger on the partitioned table \"%s\" instead.",
1531 : get_rel_name(get_partition_parent(relid, false))));
1532 :
1533 :
1534 : /* Rename the trigger on this relation ... */
1535 32 : renametrig_internal(tgrel, targetrel, tuple, stmt->newname,
1536 32 : stmt->subname);
1537 :
1538 : /* ... and if it is partitioned, recurse to its partitions */
1539 32 : if (targetrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1540 : {
1541 18 : PartitionDesc partdesc = RelationGetPartitionDesc(targetrel, true);
1542 :
1543 30 : for (int i = 0; i < partdesc->nparts; i++)
1544 : {
1545 18 : Oid partitionId = partdesc->oids[i];
1546 :
1547 18 : renametrig_partition(tgrel, partitionId, trigform->oid,
1548 18 : stmt->newname, stmt->subname);
1549 : }
1550 : }
1551 : }
1552 : else
1553 : {
1554 0 : ereport(ERROR,
1555 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1556 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1557 : stmt->subname, RelationGetRelationName(targetrel))));
1558 : }
1559 :
1560 26 : ObjectAddressSet(address, TriggerRelationId, tgoid);
1561 :
1562 26 : systable_endscan(tgscan);
1563 :
1564 26 : table_close(tgrel, RowExclusiveLock);
1565 :
1566 : /*
1567 : * Close rel, but keep exclusive lock!
1568 : */
1569 26 : relation_close(targetrel, NoLock);
1570 :
1571 26 : return address;
1572 : }
1573 :
1574 : /*
1575 : * Subroutine for renametrig -- perform the actual work of renaming one
1576 : * trigger on one table.
1577 : *
1578 : * If the trigger has a name different from the expected one, raise a
1579 : * NOTICE about it.
1580 : */
1581 : static void
1582 56 : renametrig_internal(Relation tgrel, Relation targetrel, HeapTuple trigtup,
1583 : const char *newname, const char *expected_name)
1584 : {
1585 : HeapTuple tuple;
1586 : Form_pg_trigger tgform;
1587 : ScanKeyData key[2];
1588 : SysScanDesc tgscan;
1589 :
1590 : /* If the trigger already has the new name, nothing to do. */
1591 56 : tgform = (Form_pg_trigger) GETSTRUCT(trigtup);
1592 56 : if (strcmp(NameStr(tgform->tgname), newname) == 0)
1593 0 : return;
1594 :
1595 : /*
1596 : * Before actually trying the rename, search for triggers with the same
1597 : * name. The update would fail with an ugly message in that case, and it
1598 : * is better to throw a nicer error.
1599 : */
1600 56 : ScanKeyInit(&key[0],
1601 : Anum_pg_trigger_tgrelid,
1602 : BTEqualStrategyNumber, F_OIDEQ,
1603 : ObjectIdGetDatum(RelationGetRelid(targetrel)));
1604 56 : ScanKeyInit(&key[1],
1605 : Anum_pg_trigger_tgname,
1606 : BTEqualStrategyNumber, F_NAMEEQ,
1607 : PointerGetDatum(newname));
1608 56 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1609 : NULL, 2, key);
1610 56 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1611 6 : ereport(ERROR,
1612 : (errcode(ERRCODE_DUPLICATE_OBJECT),
1613 : errmsg("trigger \"%s\" for relation \"%s\" already exists",
1614 : newname, RelationGetRelationName(targetrel))));
1615 50 : systable_endscan(tgscan);
1616 :
1617 : /*
1618 : * The target name is free; update the existing pg_trigger tuple with it.
1619 : */
1620 50 : tuple = heap_copytuple(trigtup); /* need a modifiable copy */
1621 50 : tgform = (Form_pg_trigger) GETSTRUCT(tuple);
1622 :
1623 : /*
1624 : * If the trigger has a name different from what we expected, let the user
1625 : * know. (We can proceed anyway, since we must have reached here following
1626 : * a tgparentid link.)
1627 : */
1628 50 : if (strcmp(NameStr(tgform->tgname), expected_name) != 0)
1629 0 : ereport(NOTICE,
1630 : errmsg("renamed trigger \"%s\" on relation \"%s\"",
1631 : NameStr(tgform->tgname),
1632 : RelationGetRelationName(targetrel)));
1633 :
1634 50 : namestrcpy(&tgform->tgname, newname);
1635 :
1636 50 : CatalogTupleUpdate(tgrel, &tuple->t_self, tuple);
1637 :
1638 50 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
1639 :
1640 : /*
1641 : * Invalidate relation's relcache entry so that other backends (and this
1642 : * one too!) are sent SI message to make them rebuild relcache entries.
1643 : * (Ideally this should happen automatically...)
1644 : */
1645 50 : CacheInvalidateRelcache(targetrel);
1646 : }
1647 :
1648 : /*
1649 : * Subroutine for renametrig -- Helper for recursing to partitions when
1650 : * renaming triggers on a partitioned table.
1651 : */
1652 : static void
1653 30 : renametrig_partition(Relation tgrel, Oid partitionId, Oid parentTriggerOid,
1654 : const char *newname, const char *expected_name)
1655 : {
1656 : SysScanDesc tgscan;
1657 : ScanKeyData key;
1658 : HeapTuple tuple;
1659 :
1660 : /*
1661 : * Given a relation and the OID of a trigger on parent relation, find the
1662 : * corresponding trigger in the child and rename that trigger to the given
1663 : * name.
1664 : */
1665 30 : ScanKeyInit(&key,
1666 : Anum_pg_trigger_tgrelid,
1667 : BTEqualStrategyNumber, F_OIDEQ,
1668 : ObjectIdGetDatum(partitionId));
1669 30 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1670 : NULL, 1, &key);
1671 48 : while (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1672 : {
1673 42 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tuple);
1674 : Relation partitionRel;
1675 :
1676 42 : if (tgform->tgparentid != parentTriggerOid)
1677 18 : continue; /* not our trigger */
1678 :
1679 24 : partitionRel = table_open(partitionId, NoLock);
1680 :
1681 : /* Rename the trigger on this partition */
1682 24 : renametrig_internal(tgrel, partitionRel, tuple, newname, expected_name);
1683 :
1684 : /* And if this relation is partitioned, recurse to its partitions */
1685 18 : if (partitionRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1686 : {
1687 6 : PartitionDesc partdesc = RelationGetPartitionDesc(partitionRel,
1688 : true);
1689 :
1690 18 : for (int i = 0; i < partdesc->nparts; i++)
1691 : {
1692 12 : Oid partoid = partdesc->oids[i];
1693 :
1694 12 : renametrig_partition(tgrel, partoid, tgform->oid, newname,
1695 12 : NameStr(tgform->tgname));
1696 : }
1697 : }
1698 18 : table_close(partitionRel, NoLock);
1699 :
1700 : /* There should be at most one matching tuple */
1701 18 : break;
1702 : }
1703 24 : systable_endscan(tgscan);
1704 24 : }
1705 :
1706 : /*
1707 : * EnableDisableTrigger()
1708 : *
1709 : * Called by ALTER TABLE ENABLE/DISABLE [ REPLICA | ALWAYS ] TRIGGER
1710 : * to change 'tgenabled' field for the specified trigger(s)
1711 : *
1712 : * rel: relation to process (caller must hold suitable lock on it)
1713 : * tgname: name of trigger to process, or NULL to scan all triggers
1714 : * tgparent: if not zero, process only triggers with this tgparentid
1715 : * fires_when: new value for tgenabled field. In addition to generic
1716 : * enablement/disablement, this also defines when the trigger
1717 : * should be fired in session replication roles.
1718 : * skip_system: if true, skip "system" triggers (constraint triggers)
1719 : * recurse: if true, recurse to partitions
1720 : *
1721 : * Caller should have checked permissions for the table; here we also
1722 : * enforce that superuser privilege is required to alter the state of
1723 : * system triggers
1724 : */
1725 : void
1726 450 : EnableDisableTrigger(Relation rel, const char *tgname, Oid tgparent,
1727 : char fires_when, bool skip_system, bool recurse,
1728 : LOCKMODE lockmode)
1729 : {
1730 : Relation tgrel;
1731 : int nkeys;
1732 : ScanKeyData keys[2];
1733 : SysScanDesc tgscan;
1734 : HeapTuple tuple;
1735 : bool found;
1736 : bool changed;
1737 :
1738 : /* Scan the relevant entries in pg_triggers */
1739 450 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1740 :
1741 450 : ScanKeyInit(&keys[0],
1742 : Anum_pg_trigger_tgrelid,
1743 : BTEqualStrategyNumber, F_OIDEQ,
1744 : ObjectIdGetDatum(RelationGetRelid(rel)));
1745 450 : if (tgname)
1746 : {
1747 316 : ScanKeyInit(&keys[1],
1748 : Anum_pg_trigger_tgname,
1749 : BTEqualStrategyNumber, F_NAMEEQ,
1750 : CStringGetDatum(tgname));
1751 316 : nkeys = 2;
1752 : }
1753 : else
1754 134 : nkeys = 1;
1755 :
1756 450 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1757 : NULL, nkeys, keys);
1758 :
1759 450 : found = changed = false;
1760 :
1761 1128 : while (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1762 : {
1763 678 : Form_pg_trigger oldtrig = (Form_pg_trigger) GETSTRUCT(tuple);
1764 :
1765 678 : if (OidIsValid(tgparent) && tgparent != oldtrig->tgparentid)
1766 156 : continue;
1767 :
1768 522 : if (oldtrig->tgisinternal)
1769 : {
1770 : /* system trigger ... ok to process? */
1771 60 : if (skip_system)
1772 12 : continue;
1773 48 : if (!superuser())
1774 0 : ereport(ERROR,
1775 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1776 : errmsg("permission denied: \"%s\" is a system trigger",
1777 : NameStr(oldtrig->tgname))));
1778 : }
1779 :
1780 510 : found = true;
1781 :
1782 510 : if (oldtrig->tgenabled != fires_when)
1783 : {
1784 : /* need to change this one ... make a copy to scribble on */
1785 480 : HeapTuple newtup = heap_copytuple(tuple);
1786 480 : Form_pg_trigger newtrig = (Form_pg_trigger) GETSTRUCT(newtup);
1787 :
1788 480 : newtrig->tgenabled = fires_when;
1789 :
1790 480 : CatalogTupleUpdate(tgrel, &newtup->t_self, newtup);
1791 :
1792 480 : heap_freetuple(newtup);
1793 :
1794 480 : changed = true;
1795 : }
1796 :
1797 : /*
1798 : * When altering FOR EACH ROW triggers on a partitioned table, do the
1799 : * same on the partitions as well, unless ONLY is specified.
1800 : *
1801 : * Note that we recurse even if we didn't change the trigger above,
1802 : * because the partitions' copy of the trigger may have a different
1803 : * value of tgenabled than the parent's trigger and thus might need to
1804 : * be changed.
1805 : */
1806 510 : if (recurse &&
1807 482 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
1808 86 : (TRIGGER_FOR_ROW(oldtrig->tgtype)))
1809 : {
1810 74 : PartitionDesc partdesc = RelationGetPartitionDesc(rel, true);
1811 : int i;
1812 :
1813 184 : for (i = 0; i < partdesc->nparts; i++)
1814 : {
1815 : Relation part;
1816 :
1817 110 : part = relation_open(partdesc->oids[i], lockmode);
1818 : /* Match on child triggers' tgparentid, not their name */
1819 110 : EnableDisableTrigger(part, NULL, oldtrig->oid,
1820 : fires_when, skip_system, recurse,
1821 : lockmode);
1822 110 : table_close(part, NoLock); /* keep lock till commit */
1823 : }
1824 : }
1825 :
1826 510 : InvokeObjectPostAlterHook(TriggerRelationId,
1827 : oldtrig->oid, 0);
1828 : }
1829 :
1830 450 : systable_endscan(tgscan);
1831 :
1832 450 : table_close(tgrel, RowExclusiveLock);
1833 :
1834 450 : if (tgname && !found)
1835 0 : ereport(ERROR,
1836 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1837 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1838 : tgname, RelationGetRelationName(rel))));
1839 :
1840 : /*
1841 : * If we changed anything, broadcast a SI inval message to force each
1842 : * backend (including our own!) to rebuild relation's relcache entry.
1843 : * Otherwise they will fail to apply the change promptly.
1844 : */
1845 450 : if (changed)
1846 432 : CacheInvalidateRelcache(rel);
1847 450 : }
1848 :
1849 :
1850 : /*
1851 : * Build trigger data to attach to the given relcache entry.
1852 : *
1853 : * Note that trigger data attached to a relcache entry must be stored in
1854 : * CacheMemoryContext to ensure it survives as long as the relcache entry.
1855 : * But we should be running in a less long-lived working context. To avoid
1856 : * leaking cache memory if this routine fails partway through, we build a
1857 : * temporary TriggerDesc in working memory and then copy the completed
1858 : * structure into cache memory.
1859 : */
1860 : void
1861 60770 : RelationBuildTriggers(Relation relation)
1862 : {
1863 : TriggerDesc *trigdesc;
1864 : int numtrigs;
1865 : int maxtrigs;
1866 : Trigger *triggers;
1867 : Relation tgrel;
1868 : ScanKeyData skey;
1869 : SysScanDesc tgscan;
1870 : HeapTuple htup;
1871 : MemoryContext oldContext;
1872 : int i;
1873 :
1874 : /*
1875 : * Allocate a working array to hold the triggers (the array is extended if
1876 : * necessary)
1877 : */
1878 60770 : maxtrigs = 16;
1879 60770 : triggers = (Trigger *) palloc(maxtrigs * sizeof(Trigger));
1880 60770 : numtrigs = 0;
1881 :
1882 : /*
1883 : * Note: since we scan the triggers using TriggerRelidNameIndexId, we will
1884 : * be reading the triggers in name order, except possibly during
1885 : * emergency-recovery operations (ie, IgnoreSystemIndexes). This in turn
1886 : * ensures that triggers will be fired in name order.
1887 : */
1888 60770 : ScanKeyInit(&skey,
1889 : Anum_pg_trigger_tgrelid,
1890 : BTEqualStrategyNumber, F_OIDEQ,
1891 : ObjectIdGetDatum(RelationGetRelid(relation)));
1892 :
1893 60770 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1894 60770 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1895 : NULL, 1, &skey);
1896 :
1897 166952 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
1898 : {
1899 106182 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
1900 : Trigger *build;
1901 : Datum datum;
1902 : bool isnull;
1903 :
1904 106182 : if (numtrigs >= maxtrigs)
1905 : {
1906 48 : maxtrigs *= 2;
1907 48 : triggers = (Trigger *) repalloc(triggers, maxtrigs * sizeof(Trigger));
1908 : }
1909 106182 : build = &(triggers[numtrigs]);
1910 :
1911 106182 : build->tgoid = pg_trigger->oid;
1912 106182 : build->tgname = DatumGetCString(DirectFunctionCall1(nameout,
1913 : NameGetDatum(&pg_trigger->tgname)));
1914 106182 : build->tgfoid = pg_trigger->tgfoid;
1915 106182 : build->tgtype = pg_trigger->tgtype;
1916 106182 : build->tgenabled = pg_trigger->tgenabled;
1917 106182 : build->tgisinternal = pg_trigger->tgisinternal;
1918 106182 : build->tgisclone = OidIsValid(pg_trigger->tgparentid);
1919 106182 : build->tgconstrrelid = pg_trigger->tgconstrrelid;
1920 106182 : build->tgconstrindid = pg_trigger->tgconstrindid;
1921 106182 : build->tgconstraint = pg_trigger->tgconstraint;
1922 106182 : build->tgdeferrable = pg_trigger->tgdeferrable;
1923 106182 : build->tginitdeferred = pg_trigger->tginitdeferred;
1924 106182 : build->tgnargs = pg_trigger->tgnargs;
1925 : /* tgattr is first var-width field, so OK to access directly */
1926 106182 : build->tgnattr = pg_trigger->tgattr.dim1;
1927 106182 : if (build->tgnattr > 0)
1928 : {
1929 530 : build->tgattr = (int16 *) palloc(build->tgnattr * sizeof(int16));
1930 530 : memcpy(build->tgattr, &(pg_trigger->tgattr.values),
1931 530 : build->tgnattr * sizeof(int16));
1932 : }
1933 : else
1934 105652 : build->tgattr = NULL;
1935 106182 : if (build->tgnargs > 0)
1936 : {
1937 : bytea *val;
1938 : char *p;
1939 :
1940 2866 : val = DatumGetByteaPP(fastgetattr(htup,
1941 : Anum_pg_trigger_tgargs,
1942 : tgrel->rd_att, &isnull));
1943 2866 : if (isnull)
1944 0 : elog(ERROR, "tgargs is null in trigger for relation \"%s\"",
1945 : RelationGetRelationName(relation));
1946 2866 : p = (char *) VARDATA_ANY(val);
1947 2866 : build->tgargs = (char **) palloc(build->tgnargs * sizeof(char *));
1948 6450 : for (i = 0; i < build->tgnargs; i++)
1949 : {
1950 3584 : build->tgargs[i] = pstrdup(p);
1951 3584 : p += strlen(p) + 1;
1952 : }
1953 : }
1954 : else
1955 103316 : build->tgargs = NULL;
1956 :
1957 106182 : datum = fastgetattr(htup, Anum_pg_trigger_tgoldtable,
1958 : tgrel->rd_att, &isnull);
1959 106182 : if (!isnull)
1960 818 : build->tgoldtable =
1961 818 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1962 : else
1963 105364 : build->tgoldtable = NULL;
1964 :
1965 106182 : datum = fastgetattr(htup, Anum_pg_trigger_tgnewtable,
1966 : tgrel->rd_att, &isnull);
1967 106182 : if (!isnull)
1968 1122 : build->tgnewtable =
1969 1122 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1970 : else
1971 105060 : build->tgnewtable = NULL;
1972 :
1973 106182 : datum = fastgetattr(htup, Anum_pg_trigger_tgqual,
1974 : tgrel->rd_att, &isnull);
1975 106182 : if (!isnull)
1976 914 : build->tgqual = TextDatumGetCString(datum);
1977 : else
1978 105268 : build->tgqual = NULL;
1979 :
1980 106182 : numtrigs++;
1981 : }
1982 :
1983 60770 : systable_endscan(tgscan);
1984 60770 : table_close(tgrel, AccessShareLock);
1985 :
1986 : /* There might not be any triggers */
1987 60770 : if (numtrigs == 0)
1988 : {
1989 14014 : pfree(triggers);
1990 14014 : return;
1991 : }
1992 :
1993 : /* Build trigdesc */
1994 46756 : trigdesc = (TriggerDesc *) palloc0(sizeof(TriggerDesc));
1995 46756 : trigdesc->triggers = triggers;
1996 46756 : trigdesc->numtriggers = numtrigs;
1997 152938 : for (i = 0; i < numtrigs; i++)
1998 106182 : SetTriggerFlags(trigdesc, &(triggers[i]));
1999 :
2000 : /* Copy completed trigdesc into cache storage */
2001 46756 : oldContext = MemoryContextSwitchTo(CacheMemoryContext);
2002 46756 : relation->trigdesc = CopyTriggerDesc(trigdesc);
2003 46756 : MemoryContextSwitchTo(oldContext);
2004 :
2005 : /* Release working memory */
2006 46756 : FreeTriggerDesc(trigdesc);
2007 : }
2008 :
2009 : /*
2010 : * Update the TriggerDesc's hint flags to include the specified trigger
2011 : */
2012 : static void
2013 106182 : SetTriggerFlags(TriggerDesc *trigdesc, Trigger *trigger)
2014 : {
2015 106182 : int16 tgtype = trigger->tgtype;
2016 :
2017 106182 : trigdesc->trig_insert_before_row |=
2018 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2019 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2020 106182 : trigdesc->trig_insert_after_row |=
2021 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2022 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2023 106182 : trigdesc->trig_insert_instead_row |=
2024 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2025 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_INSERT);
2026 106182 : trigdesc->trig_insert_before_statement |=
2027 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2028 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2029 106182 : trigdesc->trig_insert_after_statement |=
2030 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2031 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2032 106182 : trigdesc->trig_update_before_row |=
2033 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2034 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2035 106182 : trigdesc->trig_update_after_row |=
2036 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2037 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2038 106182 : trigdesc->trig_update_instead_row |=
2039 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2040 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_UPDATE);
2041 106182 : trigdesc->trig_update_before_statement |=
2042 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2043 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2044 106182 : trigdesc->trig_update_after_statement |=
2045 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2046 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2047 106182 : trigdesc->trig_delete_before_row |=
2048 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2049 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2050 106182 : trigdesc->trig_delete_after_row |=
2051 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2052 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2053 106182 : trigdesc->trig_delete_instead_row |=
2054 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2055 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_DELETE);
2056 106182 : trigdesc->trig_delete_before_statement |=
2057 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2058 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2059 106182 : trigdesc->trig_delete_after_statement |=
2060 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2061 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2062 : /* there are no row-level truncate triggers */
2063 106182 : trigdesc->trig_truncate_before_statement |=
2064 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2065 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_TRUNCATE);
2066 106182 : trigdesc->trig_truncate_after_statement |=
2067 106182 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2068 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_TRUNCATE);
2069 :
2070 212364 : trigdesc->trig_insert_new_table |=
2071 141614 : (TRIGGER_FOR_INSERT(tgtype) &&
2072 35432 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2073 212364 : trigdesc->trig_update_old_table |=
2074 154428 : (TRIGGER_FOR_UPDATE(tgtype) &&
2075 48246 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2076 212364 : trigdesc->trig_update_new_table |=
2077 154428 : (TRIGGER_FOR_UPDATE(tgtype) &&
2078 48246 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2079 212364 : trigdesc->trig_delete_old_table |=
2080 135532 : (TRIGGER_FOR_DELETE(tgtype) &&
2081 29350 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2082 106182 : }
2083 :
2084 : /*
2085 : * Copy a TriggerDesc data structure.
2086 : *
2087 : * The copy is allocated in the current memory context.
2088 : */
2089 : TriggerDesc *
2090 486044 : CopyTriggerDesc(TriggerDesc *trigdesc)
2091 : {
2092 : TriggerDesc *newdesc;
2093 : Trigger *trigger;
2094 : int i;
2095 :
2096 486044 : if (trigdesc == NULL || trigdesc->numtriggers <= 0)
2097 421330 : return NULL;
2098 :
2099 64714 : newdesc = (TriggerDesc *) palloc(sizeof(TriggerDesc));
2100 64714 : memcpy(newdesc, trigdesc, sizeof(TriggerDesc));
2101 :
2102 64714 : trigger = (Trigger *) palloc(trigdesc->numtriggers * sizeof(Trigger));
2103 64714 : memcpy(trigger, trigdesc->triggers,
2104 64714 : trigdesc->numtriggers * sizeof(Trigger));
2105 64714 : newdesc->triggers = trigger;
2106 :
2107 220286 : for (i = 0; i < trigdesc->numtriggers; i++)
2108 : {
2109 155572 : trigger->tgname = pstrdup(trigger->tgname);
2110 155572 : if (trigger->tgnattr > 0)
2111 : {
2112 : int16 *newattr;
2113 :
2114 1016 : newattr = (int16 *) palloc(trigger->tgnattr * sizeof(int16));
2115 1016 : memcpy(newattr, trigger->tgattr,
2116 1016 : trigger->tgnattr * sizeof(int16));
2117 1016 : trigger->tgattr = newattr;
2118 : }
2119 155572 : if (trigger->tgnargs > 0)
2120 : {
2121 : char **newargs;
2122 : int16 j;
2123 :
2124 9360 : newargs = (char **) palloc(trigger->tgnargs * sizeof(char *));
2125 20988 : for (j = 0; j < trigger->tgnargs; j++)
2126 11628 : newargs[j] = pstrdup(trigger->tgargs[j]);
2127 9360 : trigger->tgargs = newargs;
2128 : }
2129 155572 : if (trigger->tgqual)
2130 1484 : trigger->tgqual = pstrdup(trigger->tgqual);
2131 155572 : if (trigger->tgoldtable)
2132 1982 : trigger->tgoldtable = pstrdup(trigger->tgoldtable);
2133 155572 : if (trigger->tgnewtable)
2134 2340 : trigger->tgnewtable = pstrdup(trigger->tgnewtable);
2135 155572 : trigger++;
2136 : }
2137 :
2138 64714 : return newdesc;
2139 : }
2140 :
2141 : /*
2142 : * Free a TriggerDesc data structure.
2143 : */
2144 : void
2145 1216642 : FreeTriggerDesc(TriggerDesc *trigdesc)
2146 : {
2147 : Trigger *trigger;
2148 : int i;
2149 :
2150 1216642 : if (trigdesc == NULL)
2151 1127052 : return;
2152 :
2153 89590 : trigger = trigdesc->triggers;
2154 290198 : for (i = 0; i < trigdesc->numtriggers; i++)
2155 : {
2156 200608 : pfree(trigger->tgname);
2157 200608 : if (trigger->tgnattr > 0)
2158 994 : pfree(trigger->tgattr);
2159 200608 : if (trigger->tgnargs > 0)
2160 : {
2161 12134 : while (--(trigger->tgnargs) >= 0)
2162 6758 : pfree(trigger->tgargs[trigger->tgnargs]);
2163 5376 : pfree(trigger->tgargs);
2164 : }
2165 200608 : if (trigger->tgqual)
2166 1696 : pfree(trigger->tgqual);
2167 200608 : if (trigger->tgoldtable)
2168 1556 : pfree(trigger->tgoldtable);
2169 200608 : if (trigger->tgnewtable)
2170 2148 : pfree(trigger->tgnewtable);
2171 200608 : trigger++;
2172 : }
2173 89590 : pfree(trigdesc->triggers);
2174 89590 : pfree(trigdesc);
2175 : }
2176 :
2177 : /*
2178 : * Compare two TriggerDesc structures for logical equality.
2179 : */
2180 : #ifdef NOT_USED
2181 : bool
2182 : equalTriggerDescs(TriggerDesc *trigdesc1, TriggerDesc *trigdesc2)
2183 : {
2184 : int i,
2185 : j;
2186 :
2187 : /*
2188 : * We need not examine the hint flags, just the trigger array itself; if
2189 : * we have the same triggers with the same types, the flags should match.
2190 : *
2191 : * As of 7.3 we assume trigger set ordering is significant in the
2192 : * comparison; so we just compare corresponding slots of the two sets.
2193 : *
2194 : * Note: comparing the stringToNode forms of the WHEN clauses means that
2195 : * parse column locations will affect the result. This is okay as long as
2196 : * this function is only used for detecting exact equality, as for example
2197 : * in checking for staleness of a cache entry.
2198 : */
2199 : if (trigdesc1 != NULL)
2200 : {
2201 : if (trigdesc2 == NULL)
2202 : return false;
2203 : if (trigdesc1->numtriggers != trigdesc2->numtriggers)
2204 : return false;
2205 : for (i = 0; i < trigdesc1->numtriggers; i++)
2206 : {
2207 : Trigger *trig1 = trigdesc1->triggers + i;
2208 : Trigger *trig2 = trigdesc2->triggers + i;
2209 :
2210 : if (trig1->tgoid != trig2->tgoid)
2211 : return false;
2212 : if (strcmp(trig1->tgname, trig2->tgname) != 0)
2213 : return false;
2214 : if (trig1->tgfoid != trig2->tgfoid)
2215 : return false;
2216 : if (trig1->tgtype != trig2->tgtype)
2217 : return false;
2218 : if (trig1->tgenabled != trig2->tgenabled)
2219 : return false;
2220 : if (trig1->tgisinternal != trig2->tgisinternal)
2221 : return false;
2222 : if (trig1->tgisclone != trig2->tgisclone)
2223 : return false;
2224 : if (trig1->tgconstrrelid != trig2->tgconstrrelid)
2225 : return false;
2226 : if (trig1->tgconstrindid != trig2->tgconstrindid)
2227 : return false;
2228 : if (trig1->tgconstraint != trig2->tgconstraint)
2229 : return false;
2230 : if (trig1->tgdeferrable != trig2->tgdeferrable)
2231 : return false;
2232 : if (trig1->tginitdeferred != trig2->tginitdeferred)
2233 : return false;
2234 : if (trig1->tgnargs != trig2->tgnargs)
2235 : return false;
2236 : if (trig1->tgnattr != trig2->tgnattr)
2237 : return false;
2238 : if (trig1->tgnattr > 0 &&
2239 : memcmp(trig1->tgattr, trig2->tgattr,
2240 : trig1->tgnattr * sizeof(int16)) != 0)
2241 : return false;
2242 : for (j = 0; j < trig1->tgnargs; j++)
2243 : if (strcmp(trig1->tgargs[j], trig2->tgargs[j]) != 0)
2244 : return false;
2245 : if (trig1->tgqual == NULL && trig2->tgqual == NULL)
2246 : /* ok */ ;
2247 : else if (trig1->tgqual == NULL || trig2->tgqual == NULL)
2248 : return false;
2249 : else if (strcmp(trig1->tgqual, trig2->tgqual) != 0)
2250 : return false;
2251 : if (trig1->tgoldtable == NULL && trig2->tgoldtable == NULL)
2252 : /* ok */ ;
2253 : else if (trig1->tgoldtable == NULL || trig2->tgoldtable == NULL)
2254 : return false;
2255 : else if (strcmp(trig1->tgoldtable, trig2->tgoldtable) != 0)
2256 : return false;
2257 : if (trig1->tgnewtable == NULL && trig2->tgnewtable == NULL)
2258 : /* ok */ ;
2259 : else if (trig1->tgnewtable == NULL || trig2->tgnewtable == NULL)
2260 : return false;
2261 : else if (strcmp(trig1->tgnewtable, trig2->tgnewtable) != 0)
2262 : return false;
2263 : }
2264 : }
2265 : else if (trigdesc2 != NULL)
2266 : return false;
2267 : return true;
2268 : }
2269 : #endif /* NOT_USED */
2270 :
2271 : /*
2272 : * Check if there is a row-level trigger with transition tables that prevents
2273 : * a table from becoming an inheritance child or partition. Return the name
2274 : * of the first such incompatible trigger, or NULL if there is none.
2275 : */
2276 : const char *
2277 2532 : FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc)
2278 : {
2279 2532 : if (trigdesc != NULL)
2280 : {
2281 : int i;
2282 :
2283 510 : for (i = 0; i < trigdesc->numtriggers; ++i)
2284 : {
2285 366 : Trigger *trigger = &trigdesc->triggers[i];
2286 :
2287 366 : if (trigger->tgoldtable != NULL || trigger->tgnewtable != NULL)
2288 12 : return trigger->tgname;
2289 : }
2290 : }
2291 :
2292 2520 : return NULL;
2293 : }
2294 :
2295 : /*
2296 : * Call a trigger function.
2297 : *
2298 : * trigdata: trigger descriptor.
2299 : * tgindx: trigger's index in finfo and instr arrays.
2300 : * finfo: array of cached trigger function call information.
2301 : * instr: optional array of EXPLAIN ANALYZE instrumentation state.
2302 : * per_tuple_context: memory context to execute the function in.
2303 : *
2304 : * Returns the tuple (or NULL) as returned by the function.
2305 : */
2306 : static HeapTuple
2307 22202 : ExecCallTriggerFunc(TriggerData *trigdata,
2308 : int tgindx,
2309 : FmgrInfo *finfo,
2310 : Instrumentation *instr,
2311 : MemoryContext per_tuple_context)
2312 : {
2313 22202 : LOCAL_FCINFO(fcinfo, 0);
2314 : PgStat_FunctionCallUsage fcusage;
2315 : Datum result;
2316 : MemoryContext oldContext;
2317 :
2318 : /*
2319 : * Protect against code paths that may fail to initialize transition table
2320 : * info.
2321 : */
2322 : Assert(((TRIGGER_FIRED_BY_INSERT(trigdata->tg_event) ||
2323 : TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event) ||
2324 : TRIGGER_FIRED_BY_DELETE(trigdata->tg_event)) &&
2325 : TRIGGER_FIRED_AFTER(trigdata->tg_event) &&
2326 : !(trigdata->tg_event & AFTER_TRIGGER_DEFERRABLE) &&
2327 : !(trigdata->tg_event & AFTER_TRIGGER_INITDEFERRED)) ||
2328 : (trigdata->tg_oldtable == NULL && trigdata->tg_newtable == NULL));
2329 :
2330 22202 : finfo += tgindx;
2331 :
2332 : /*
2333 : * We cache fmgr lookup info, to avoid making the lookup again on each
2334 : * call.
2335 : */
2336 22202 : if (finfo->fn_oid == InvalidOid)
2337 18976 : fmgr_info(trigdata->tg_trigger->tgfoid, finfo);
2338 :
2339 : Assert(finfo->fn_oid == trigdata->tg_trigger->tgfoid);
2340 :
2341 : /*
2342 : * If doing EXPLAIN ANALYZE, start charging time to this trigger.
2343 : */
2344 22202 : if (instr)
2345 0 : InstrStartNode(instr + tgindx);
2346 :
2347 : /*
2348 : * Do the function evaluation in the per-tuple memory context, so that
2349 : * leaked memory will be reclaimed once per tuple. Note in particular that
2350 : * any new tuple created by the trigger function will live till the end of
2351 : * the tuple cycle.
2352 : */
2353 22202 : oldContext = MemoryContextSwitchTo(per_tuple_context);
2354 :
2355 : /*
2356 : * Call the function, passing no arguments but setting a context.
2357 : */
2358 22202 : InitFunctionCallInfoData(*fcinfo, finfo, 0,
2359 : InvalidOid, (Node *) trigdata, NULL);
2360 :
2361 22202 : pgstat_init_function_usage(fcinfo, &fcusage);
2362 :
2363 22202 : MyTriggerDepth++;
2364 22202 : PG_TRY();
2365 : {
2366 22202 : result = FunctionCallInvoke(fcinfo);
2367 : }
2368 1450 : PG_FINALLY();
2369 : {
2370 22202 : MyTriggerDepth--;
2371 : }
2372 22202 : PG_END_TRY();
2373 :
2374 20752 : pgstat_end_function_usage(&fcusage, true);
2375 :
2376 20752 : MemoryContextSwitchTo(oldContext);
2377 :
2378 : /*
2379 : * Trigger protocol allows function to return a null pointer, but NOT to
2380 : * set the isnull result flag.
2381 : */
2382 20752 : if (fcinfo->isnull)
2383 0 : ereport(ERROR,
2384 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2385 : errmsg("trigger function %u returned null value",
2386 : fcinfo->flinfo->fn_oid)));
2387 :
2388 : /*
2389 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
2390 : * one "tuple returned" (really the number of firings).
2391 : */
2392 20752 : if (instr)
2393 0 : InstrStopNode(instr + tgindx, 1);
2394 :
2395 20752 : return (HeapTuple) DatumGetPointer(result);
2396 : }
2397 :
2398 : void
2399 95180 : ExecBSInsertTriggers(EState *estate, ResultRelInfo *relinfo)
2400 : {
2401 : TriggerDesc *trigdesc;
2402 : int i;
2403 95180 : TriggerData LocTriggerData = {0};
2404 :
2405 95180 : trigdesc = relinfo->ri_TrigDesc;
2406 :
2407 95180 : if (trigdesc == NULL)
2408 94968 : return;
2409 7360 : if (!trigdesc->trig_insert_before_statement)
2410 7148 : return;
2411 :
2412 : /* no-op if we already fired BS triggers in this context */
2413 212 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2414 : CMD_INSERT))
2415 0 : return;
2416 :
2417 212 : LocTriggerData.type = T_TriggerData;
2418 212 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2419 : TRIGGER_EVENT_BEFORE;
2420 212 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2421 1832 : for (i = 0; i < trigdesc->numtriggers; i++)
2422 : {
2423 1632 : Trigger *trigger = &trigdesc->triggers[i];
2424 : HeapTuple newtuple;
2425 :
2426 1632 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2427 : TRIGGER_TYPE_STATEMENT,
2428 : TRIGGER_TYPE_BEFORE,
2429 : TRIGGER_TYPE_INSERT))
2430 1408 : continue;
2431 224 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2432 : NULL, NULL, NULL))
2433 30 : continue;
2434 :
2435 194 : LocTriggerData.tg_trigger = trigger;
2436 194 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2437 : i,
2438 : relinfo->ri_TrigFunctions,
2439 : relinfo->ri_TrigInstrument,
2440 194 : GetPerTupleMemoryContext(estate));
2441 :
2442 182 : if (newtuple)
2443 0 : ereport(ERROR,
2444 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2445 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2446 : }
2447 : }
2448 :
2449 : void
2450 92656 : ExecASInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2451 : TransitionCaptureState *transition_capture)
2452 : {
2453 92656 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2454 :
2455 92656 : if (trigdesc && trigdesc->trig_insert_after_statement)
2456 436 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2457 : TRIGGER_EVENT_INSERT,
2458 : false, NULL, NULL, NIL, NULL, transition_capture,
2459 : false);
2460 92656 : }
2461 :
2462 : bool
2463 2430 : ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2464 : TupleTableSlot *slot)
2465 : {
2466 2430 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2467 2430 : HeapTuple newtuple = NULL;
2468 : bool should_free;
2469 2430 : TriggerData LocTriggerData = {0};
2470 : int i;
2471 :
2472 2430 : LocTriggerData.type = T_TriggerData;
2473 2430 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2474 : TRIGGER_EVENT_ROW |
2475 : TRIGGER_EVENT_BEFORE;
2476 2430 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2477 11156 : for (i = 0; i < trigdesc->numtriggers; i++)
2478 : {
2479 9060 : Trigger *trigger = &trigdesc->triggers[i];
2480 : HeapTuple oldtuple;
2481 :
2482 9060 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2483 : TRIGGER_TYPE_ROW,
2484 : TRIGGER_TYPE_BEFORE,
2485 : TRIGGER_TYPE_INSERT))
2486 4310 : continue;
2487 4750 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2488 : NULL, NULL, slot))
2489 62 : continue;
2490 :
2491 4688 : if (!newtuple)
2492 2396 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2493 :
2494 4688 : LocTriggerData.tg_trigslot = slot;
2495 4688 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2496 4688 : LocTriggerData.tg_trigger = trigger;
2497 4688 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2498 : i,
2499 : relinfo->ri_TrigFunctions,
2500 : relinfo->ri_TrigInstrument,
2501 4688 : GetPerTupleMemoryContext(estate));
2502 4596 : if (newtuple == NULL)
2503 : {
2504 218 : if (should_free)
2505 20 : heap_freetuple(oldtuple);
2506 218 : return false; /* "do nothing" */
2507 : }
2508 4378 : else if (newtuple != oldtuple)
2509 : {
2510 758 : newtuple = check_modified_virtual_generated(RelationGetDescr(relinfo->ri_RelationDesc), newtuple);
2511 :
2512 758 : ExecForceStoreHeapTuple(newtuple, slot, false);
2513 :
2514 : /*
2515 : * After a tuple in a partition goes through a trigger, the user
2516 : * could have changed the partition key enough that the tuple no
2517 : * longer fits the partition. Verify that.
2518 : */
2519 758 : if (trigger->tgisclone &&
2520 66 : !ExecPartitionCheck(relinfo, slot, estate, false))
2521 24 : ereport(ERROR,
2522 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2523 : errmsg("moving row to another partition during a BEFORE FOR EACH ROW trigger is not supported"),
2524 : errdetail("Before executing trigger \"%s\", the row was to be in partition \"%s.%s\".",
2525 : trigger->tgname,
2526 : get_namespace_name(RelationGetNamespace(relinfo->ri_RelationDesc)),
2527 : RelationGetRelationName(relinfo->ri_RelationDesc))));
2528 :
2529 734 : if (should_free)
2530 40 : heap_freetuple(oldtuple);
2531 :
2532 : /* signal tuple should be re-fetched if used */
2533 734 : newtuple = NULL;
2534 : }
2535 : }
2536 :
2537 2096 : return true;
2538 : }
2539 :
2540 : void
2541 11888832 : ExecARInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2542 : TupleTableSlot *slot, List *recheckIndexes,
2543 : TransitionCaptureState *transition_capture)
2544 : {
2545 11888832 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2546 :
2547 11888832 : if ((trigdesc && trigdesc->trig_insert_after_row) ||
2548 60324 : (transition_capture && transition_capture->tcs_insert_new_table))
2549 65652 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2550 : TRIGGER_EVENT_INSERT,
2551 : true, NULL, slot,
2552 : recheckIndexes, NULL,
2553 : transition_capture,
2554 : false);
2555 11888832 : }
2556 :
2557 : bool
2558 180 : ExecIRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2559 : TupleTableSlot *slot)
2560 : {
2561 180 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2562 180 : HeapTuple newtuple = NULL;
2563 : bool should_free;
2564 180 : TriggerData LocTriggerData = {0};
2565 : int i;
2566 :
2567 180 : LocTriggerData.type = T_TriggerData;
2568 180 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2569 : TRIGGER_EVENT_ROW |
2570 : TRIGGER_EVENT_INSTEAD;
2571 180 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2572 546 : for (i = 0; i < trigdesc->numtriggers; i++)
2573 : {
2574 384 : Trigger *trigger = &trigdesc->triggers[i];
2575 : HeapTuple oldtuple;
2576 :
2577 384 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2578 : TRIGGER_TYPE_ROW,
2579 : TRIGGER_TYPE_INSTEAD,
2580 : TRIGGER_TYPE_INSERT))
2581 204 : continue;
2582 180 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2583 : NULL, NULL, slot))
2584 0 : continue;
2585 :
2586 180 : if (!newtuple)
2587 180 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2588 :
2589 180 : LocTriggerData.tg_trigslot = slot;
2590 180 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2591 180 : LocTriggerData.tg_trigger = trigger;
2592 180 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2593 : i,
2594 : relinfo->ri_TrigFunctions,
2595 : relinfo->ri_TrigInstrument,
2596 180 : GetPerTupleMemoryContext(estate));
2597 180 : if (newtuple == NULL)
2598 : {
2599 18 : if (should_free)
2600 18 : heap_freetuple(oldtuple);
2601 18 : return false; /* "do nothing" */
2602 : }
2603 162 : else if (newtuple != oldtuple)
2604 : {
2605 54 : ExecForceStoreHeapTuple(newtuple, slot, false);
2606 :
2607 54 : if (should_free)
2608 54 : heap_freetuple(oldtuple);
2609 :
2610 : /* signal tuple should be re-fetched if used */
2611 54 : newtuple = NULL;
2612 : }
2613 : }
2614 :
2615 162 : return true;
2616 : }
2617 :
2618 : void
2619 12558 : ExecBSDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
2620 : {
2621 : TriggerDesc *trigdesc;
2622 : int i;
2623 12558 : TriggerData LocTriggerData = {0};
2624 :
2625 12558 : trigdesc = relinfo->ri_TrigDesc;
2626 :
2627 12558 : if (trigdesc == NULL)
2628 12480 : return;
2629 1652 : if (!trigdesc->trig_delete_before_statement)
2630 1532 : return;
2631 :
2632 : /* no-op if we already fired BS triggers in this context */
2633 120 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2634 : CMD_DELETE))
2635 42 : return;
2636 :
2637 78 : LocTriggerData.type = T_TriggerData;
2638 78 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2639 : TRIGGER_EVENT_BEFORE;
2640 78 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2641 708 : for (i = 0; i < trigdesc->numtriggers; i++)
2642 : {
2643 630 : Trigger *trigger = &trigdesc->triggers[i];
2644 : HeapTuple newtuple;
2645 :
2646 630 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2647 : TRIGGER_TYPE_STATEMENT,
2648 : TRIGGER_TYPE_BEFORE,
2649 : TRIGGER_TYPE_DELETE))
2650 552 : continue;
2651 78 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2652 : NULL, NULL, NULL))
2653 12 : continue;
2654 :
2655 66 : LocTriggerData.tg_trigger = trigger;
2656 66 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2657 : i,
2658 : relinfo->ri_TrigFunctions,
2659 : relinfo->ri_TrigInstrument,
2660 66 : GetPerTupleMemoryContext(estate));
2661 :
2662 66 : if (newtuple)
2663 0 : ereport(ERROR,
2664 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2665 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2666 : }
2667 : }
2668 :
2669 : void
2670 12398 : ExecASDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2671 : TransitionCaptureState *transition_capture)
2672 : {
2673 12398 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2674 :
2675 12398 : if (trigdesc && trigdesc->trig_delete_after_statement)
2676 236 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2677 : TRIGGER_EVENT_DELETE,
2678 : false, NULL, NULL, NIL, NULL, transition_capture,
2679 : false);
2680 12398 : }
2681 :
2682 : /*
2683 : * Execute BEFORE ROW DELETE triggers.
2684 : *
2685 : * True indicates caller can proceed with the delete. False indicates caller
2686 : * need to suppress the delete and additionally if requested, we need to pass
2687 : * back the concurrently updated tuple if any.
2688 : */
2689 : bool
2690 394 : ExecBRDeleteTriggers(EState *estate, EPQState *epqstate,
2691 : ResultRelInfo *relinfo,
2692 : ItemPointer tupleid,
2693 : HeapTuple fdw_trigtuple,
2694 : TupleTableSlot **epqslot,
2695 : TM_Result *tmresult,
2696 : TM_FailureData *tmfd)
2697 : {
2698 394 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2699 394 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2700 394 : bool result = true;
2701 394 : TriggerData LocTriggerData = {0};
2702 : HeapTuple trigtuple;
2703 394 : bool should_free = false;
2704 : int i;
2705 :
2706 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2707 394 : if (fdw_trigtuple == NULL)
2708 : {
2709 378 : TupleTableSlot *epqslot_candidate = NULL;
2710 :
2711 378 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
2712 : LockTupleExclusive, slot, &epqslot_candidate,
2713 : tmresult, tmfd))
2714 12 : return false;
2715 :
2716 : /*
2717 : * If the tuple was concurrently updated and the caller of this
2718 : * function requested for the updated tuple, skip the trigger
2719 : * execution.
2720 : */
2721 362 : if (epqslot_candidate != NULL && epqslot != NULL)
2722 : {
2723 2 : *epqslot = epqslot_candidate;
2724 2 : return false;
2725 : }
2726 :
2727 360 : trigtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2728 : }
2729 : else
2730 : {
2731 16 : trigtuple = fdw_trigtuple;
2732 16 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2733 : }
2734 :
2735 376 : LocTriggerData.type = T_TriggerData;
2736 376 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2737 : TRIGGER_EVENT_ROW |
2738 : TRIGGER_EVENT_BEFORE;
2739 376 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2740 1330 : for (i = 0; i < trigdesc->numtriggers; i++)
2741 : {
2742 : HeapTuple newtuple;
2743 1034 : Trigger *trigger = &trigdesc->triggers[i];
2744 :
2745 1034 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2746 : TRIGGER_TYPE_ROW,
2747 : TRIGGER_TYPE_BEFORE,
2748 : TRIGGER_TYPE_DELETE))
2749 652 : continue;
2750 382 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2751 : NULL, slot, NULL))
2752 14 : continue;
2753 :
2754 368 : LocTriggerData.tg_trigslot = slot;
2755 368 : LocTriggerData.tg_trigtuple = trigtuple;
2756 368 : LocTriggerData.tg_trigger = trigger;
2757 368 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2758 : i,
2759 : relinfo->ri_TrigFunctions,
2760 : relinfo->ri_TrigInstrument,
2761 368 : GetPerTupleMemoryContext(estate));
2762 340 : if (newtuple == NULL)
2763 : {
2764 52 : result = false; /* tell caller to suppress delete */
2765 52 : break;
2766 : }
2767 288 : if (newtuple != trigtuple)
2768 56 : heap_freetuple(newtuple);
2769 : }
2770 348 : if (should_free)
2771 0 : heap_freetuple(trigtuple);
2772 :
2773 348 : return result;
2774 : }
2775 :
2776 : /*
2777 : * Note: is_crosspart_update must be true if the DELETE is being performed
2778 : * as part of a cross-partition update.
2779 : */
2780 : void
2781 1720528 : ExecARDeleteTriggers(EState *estate,
2782 : ResultRelInfo *relinfo,
2783 : ItemPointer tupleid,
2784 : HeapTuple fdw_trigtuple,
2785 : TransitionCaptureState *transition_capture,
2786 : bool is_crosspart_update)
2787 : {
2788 1720528 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2789 :
2790 1720528 : if ((trigdesc && trigdesc->trig_delete_after_row) ||
2791 5016 : (transition_capture && transition_capture->tcs_delete_old_table))
2792 : {
2793 6232 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2794 :
2795 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2796 6232 : if (fdw_trigtuple == NULL)
2797 6216 : GetTupleForTrigger(estate,
2798 : NULL,
2799 : relinfo,
2800 : tupleid,
2801 : LockTupleExclusive,
2802 : slot,
2803 : NULL,
2804 : NULL,
2805 : NULL);
2806 : else
2807 16 : ExecForceStoreHeapTuple(fdw_trigtuple, slot, false);
2808 :
2809 6232 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2810 : TRIGGER_EVENT_DELETE,
2811 : true, slot, NULL, NIL, NULL,
2812 : transition_capture,
2813 : is_crosspart_update);
2814 : }
2815 1720528 : }
2816 :
2817 : bool
2818 60 : ExecIRDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2819 : HeapTuple trigtuple)
2820 : {
2821 60 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2822 60 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2823 60 : TriggerData LocTriggerData = {0};
2824 : int i;
2825 :
2826 60 : LocTriggerData.type = T_TriggerData;
2827 60 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2828 : TRIGGER_EVENT_ROW |
2829 : TRIGGER_EVENT_INSTEAD;
2830 60 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2831 :
2832 60 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2833 :
2834 354 : for (i = 0; i < trigdesc->numtriggers; i++)
2835 : {
2836 : HeapTuple rettuple;
2837 300 : Trigger *trigger = &trigdesc->triggers[i];
2838 :
2839 300 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2840 : TRIGGER_TYPE_ROW,
2841 : TRIGGER_TYPE_INSTEAD,
2842 : TRIGGER_TYPE_DELETE))
2843 240 : continue;
2844 60 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2845 : NULL, slot, NULL))
2846 0 : continue;
2847 :
2848 60 : LocTriggerData.tg_trigslot = slot;
2849 60 : LocTriggerData.tg_trigtuple = trigtuple;
2850 60 : LocTriggerData.tg_trigger = trigger;
2851 60 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
2852 : i,
2853 : relinfo->ri_TrigFunctions,
2854 : relinfo->ri_TrigInstrument,
2855 60 : GetPerTupleMemoryContext(estate));
2856 60 : if (rettuple == NULL)
2857 6 : return false; /* Delete was suppressed */
2858 54 : if (rettuple != trigtuple)
2859 0 : heap_freetuple(rettuple);
2860 : }
2861 54 : return true;
2862 : }
2863 :
2864 : void
2865 14988 : ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
2866 : {
2867 : TriggerDesc *trigdesc;
2868 : int i;
2869 14988 : TriggerData LocTriggerData = {0};
2870 : Bitmapset *updatedCols;
2871 :
2872 14988 : trigdesc = relinfo->ri_TrigDesc;
2873 :
2874 14988 : if (trigdesc == NULL)
2875 14810 : return;
2876 4252 : if (!trigdesc->trig_update_before_statement)
2877 4074 : return;
2878 :
2879 : /* no-op if we already fired BS triggers in this context */
2880 178 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2881 : CMD_UPDATE))
2882 0 : return;
2883 :
2884 : /* statement-level triggers operate on the parent table */
2885 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2886 :
2887 178 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
2888 :
2889 178 : LocTriggerData.type = T_TriggerData;
2890 178 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
2891 : TRIGGER_EVENT_BEFORE;
2892 178 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2893 178 : LocTriggerData.tg_updatedcols = updatedCols;
2894 1600 : for (i = 0; i < trigdesc->numtriggers; i++)
2895 : {
2896 1422 : Trigger *trigger = &trigdesc->triggers[i];
2897 : HeapTuple newtuple;
2898 :
2899 1422 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2900 : TRIGGER_TYPE_STATEMENT,
2901 : TRIGGER_TYPE_BEFORE,
2902 : TRIGGER_TYPE_UPDATE))
2903 1244 : continue;
2904 178 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2905 : updatedCols, NULL, NULL))
2906 6 : continue;
2907 :
2908 172 : LocTriggerData.tg_trigger = trigger;
2909 172 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2910 : i,
2911 : relinfo->ri_TrigFunctions,
2912 : relinfo->ri_TrigInstrument,
2913 172 : GetPerTupleMemoryContext(estate));
2914 :
2915 172 : if (newtuple)
2916 0 : ereport(ERROR,
2917 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2918 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2919 : }
2920 : }
2921 :
2922 : void
2923 14080 : ExecASUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
2924 : TransitionCaptureState *transition_capture)
2925 : {
2926 14080 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2927 :
2928 : /* statement-level triggers operate on the parent table */
2929 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2930 :
2931 14080 : if (trigdesc && trigdesc->trig_update_after_statement)
2932 408 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2933 : TRIGGER_EVENT_UPDATE,
2934 : false, NULL, NULL, NIL,
2935 : ExecGetAllUpdatedCols(relinfo, estate),
2936 : transition_capture,
2937 : false);
2938 14080 : }
2939 :
2940 : bool
2941 2608 : ExecBRUpdateTriggers(EState *estate, EPQState *epqstate,
2942 : ResultRelInfo *relinfo,
2943 : ItemPointer tupleid,
2944 : HeapTuple fdw_trigtuple,
2945 : TupleTableSlot *newslot,
2946 : TM_Result *tmresult,
2947 : TM_FailureData *tmfd)
2948 : {
2949 2608 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2950 2608 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
2951 2608 : HeapTuple newtuple = NULL;
2952 : HeapTuple trigtuple;
2953 2608 : bool should_free_trig = false;
2954 2608 : bool should_free_new = false;
2955 2608 : TriggerData LocTriggerData = {0};
2956 : int i;
2957 : Bitmapset *updatedCols;
2958 : LockTupleMode lockmode;
2959 :
2960 : /* Determine lock mode to use */
2961 2608 : lockmode = ExecUpdateLockMode(estate, relinfo);
2962 :
2963 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2964 2608 : if (fdw_trigtuple == NULL)
2965 : {
2966 2570 : TupleTableSlot *epqslot_candidate = NULL;
2967 :
2968 : /* get a copy of the on-disk tuple we are planning to update */
2969 2570 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
2970 : lockmode, oldslot, &epqslot_candidate,
2971 : tmresult, tmfd))
2972 22 : return false; /* cancel the update action */
2973 :
2974 : /*
2975 : * In READ COMMITTED isolation level it's possible that target tuple
2976 : * was changed due to concurrent update. In that case we have a raw
2977 : * subplan output tuple in epqslot_candidate, and need to form a new
2978 : * insertable tuple using ExecGetUpdateNewTuple to replace the one we
2979 : * received in newslot. Neither we nor our callers have any further
2980 : * interest in the passed-in tuple, so it's okay to overwrite newslot
2981 : * with the newer data.
2982 : */
2983 2540 : if (epqslot_candidate != NULL)
2984 : {
2985 : TupleTableSlot *epqslot_clean;
2986 :
2987 6 : epqslot_clean = ExecGetUpdateNewTuple(relinfo, epqslot_candidate,
2988 : oldslot);
2989 :
2990 : /*
2991 : * Typically, the caller's newslot was also generated by
2992 : * ExecGetUpdateNewTuple, so that epqslot_clean will be the same
2993 : * slot and copying is not needed. But do the right thing if it
2994 : * isn't.
2995 : */
2996 6 : if (unlikely(newslot != epqslot_clean))
2997 0 : ExecCopySlot(newslot, epqslot_clean);
2998 :
2999 : /*
3000 : * At this point newslot contains a virtual tuple that may
3001 : * reference some fields of oldslot's tuple in some disk buffer.
3002 : * If that tuple is in a different page than the original target
3003 : * tuple, then our only pin on that buffer is oldslot's, and we're
3004 : * about to release it. Hence we'd better materialize newslot to
3005 : * ensure it doesn't contain references into an unpinned buffer.
3006 : * (We'd materialize it below anyway, but too late for safety.)
3007 : */
3008 6 : ExecMaterializeSlot(newslot);
3009 : }
3010 :
3011 : /*
3012 : * Here we convert oldslot to a materialized slot holding trigtuple.
3013 : * Neither slot passed to the triggers will hold any buffer pin.
3014 : */
3015 2540 : trigtuple = ExecFetchSlotHeapTuple(oldslot, true, &should_free_trig);
3016 : }
3017 : else
3018 : {
3019 : /* Put the FDW-supplied tuple into oldslot to unify the cases */
3020 38 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3021 38 : trigtuple = fdw_trigtuple;
3022 : }
3023 :
3024 2578 : LocTriggerData.type = T_TriggerData;
3025 2578 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3026 : TRIGGER_EVENT_ROW |
3027 : TRIGGER_EVENT_BEFORE;
3028 2578 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3029 2578 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
3030 2578 : LocTriggerData.tg_updatedcols = updatedCols;
3031 11548 : for (i = 0; i < trigdesc->numtriggers; i++)
3032 : {
3033 9136 : Trigger *trigger = &trigdesc->triggers[i];
3034 : HeapTuple oldtuple;
3035 :
3036 9136 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3037 : TRIGGER_TYPE_ROW,
3038 : TRIGGER_TYPE_BEFORE,
3039 : TRIGGER_TYPE_UPDATE))
3040 4462 : continue;
3041 4674 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3042 : updatedCols, oldslot, newslot))
3043 98 : continue;
3044 :
3045 4576 : if (!newtuple)
3046 2578 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free_new);
3047 :
3048 4576 : LocTriggerData.tg_trigslot = oldslot;
3049 4576 : LocTriggerData.tg_trigtuple = trigtuple;
3050 4576 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3051 4576 : LocTriggerData.tg_newslot = newslot;
3052 4576 : LocTriggerData.tg_trigger = trigger;
3053 4576 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3054 : i,
3055 : relinfo->ri_TrigFunctions,
3056 : relinfo->ri_TrigInstrument,
3057 4576 : GetPerTupleMemoryContext(estate));
3058 :
3059 4548 : if (newtuple == NULL)
3060 : {
3061 138 : if (should_free_trig)
3062 0 : heap_freetuple(trigtuple);
3063 138 : if (should_free_new)
3064 4 : heap_freetuple(oldtuple);
3065 138 : return false; /* "do nothing" */
3066 : }
3067 4410 : else if (newtuple != oldtuple)
3068 : {
3069 1304 : newtuple = check_modified_virtual_generated(RelationGetDescr(relinfo->ri_RelationDesc), newtuple);
3070 :
3071 1304 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3072 :
3073 : /*
3074 : * If the tuple returned by the trigger / being stored, is the old
3075 : * row version, and the heap tuple passed to the trigger was
3076 : * allocated locally, materialize the slot. Otherwise we might
3077 : * free it while still referenced by the slot.
3078 : */
3079 1304 : if (should_free_trig && newtuple == trigtuple)
3080 0 : ExecMaterializeSlot(newslot);
3081 :
3082 1304 : if (should_free_new)
3083 2 : heap_freetuple(oldtuple);
3084 :
3085 : /* signal tuple should be re-fetched if used */
3086 1304 : newtuple = NULL;
3087 : }
3088 : }
3089 2412 : if (should_free_trig)
3090 0 : heap_freetuple(trigtuple);
3091 :
3092 2412 : return true;
3093 : }
3094 :
3095 : /*
3096 : * Note: 'src_partinfo' and 'dst_partinfo', when non-NULL, refer to the source
3097 : * and destination partitions, respectively, of a cross-partition update of
3098 : * the root partitioned table mentioned in the query, given by 'relinfo'.
3099 : * 'tupleid' in that case refers to the ctid of the "old" tuple in the source
3100 : * partition, and 'newslot' contains the "new" tuple in the destination
3101 : * partition. This interface allows to support the requirements of
3102 : * ExecCrossPartitionUpdateForeignKey(); is_crosspart_update must be true in
3103 : * that case.
3104 : */
3105 : void
3106 379178 : ExecARUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3107 : ResultRelInfo *src_partinfo,
3108 : ResultRelInfo *dst_partinfo,
3109 : ItemPointer tupleid,
3110 : HeapTuple fdw_trigtuple,
3111 : TupleTableSlot *newslot,
3112 : List *recheckIndexes,
3113 : TransitionCaptureState *transition_capture,
3114 : bool is_crosspart_update)
3115 : {
3116 379178 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3117 :
3118 379178 : if ((trigdesc && trigdesc->trig_update_after_row) ||
3119 372 : (transition_capture &&
3120 372 : (transition_capture->tcs_update_old_table ||
3121 18 : transition_capture->tcs_update_new_table)))
3122 : {
3123 : /*
3124 : * Note: if the UPDATE is converted into a DELETE+INSERT as part of
3125 : * update-partition-key operation, then this function is also called
3126 : * separately for DELETE and INSERT to capture transition table rows.
3127 : * In such case, either old tuple or new tuple can be NULL.
3128 : */
3129 : TupleTableSlot *oldslot;
3130 : ResultRelInfo *tupsrc;
3131 :
3132 : Assert((src_partinfo != NULL && dst_partinfo != NULL) ||
3133 : !is_crosspart_update);
3134 :
3135 3830 : tupsrc = src_partinfo ? src_partinfo : relinfo;
3136 3830 : oldslot = ExecGetTriggerOldSlot(estate, tupsrc);
3137 :
3138 3830 : if (fdw_trigtuple == NULL && ItemPointerIsValid(tupleid))
3139 3762 : GetTupleForTrigger(estate,
3140 : NULL,
3141 : tupsrc,
3142 : tupleid,
3143 : LockTupleExclusive,
3144 : oldslot,
3145 : NULL,
3146 : NULL,
3147 : NULL);
3148 68 : else if (fdw_trigtuple != NULL)
3149 20 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3150 : else
3151 48 : ExecClearTuple(oldslot);
3152 :
3153 3830 : AfterTriggerSaveEvent(estate, relinfo,
3154 : src_partinfo, dst_partinfo,
3155 : TRIGGER_EVENT_UPDATE,
3156 : true,
3157 : oldslot, newslot, recheckIndexes,
3158 : ExecGetAllUpdatedCols(relinfo, estate),
3159 : transition_capture,
3160 : is_crosspart_update);
3161 : }
3162 379178 : }
3163 :
3164 : bool
3165 204 : ExecIRUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3166 : HeapTuple trigtuple, TupleTableSlot *newslot)
3167 : {
3168 204 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3169 204 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
3170 204 : HeapTuple newtuple = NULL;
3171 : bool should_free;
3172 204 : TriggerData LocTriggerData = {0};
3173 : int i;
3174 :
3175 204 : LocTriggerData.type = T_TriggerData;
3176 204 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3177 : TRIGGER_EVENT_ROW |
3178 : TRIGGER_EVENT_INSTEAD;
3179 204 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3180 :
3181 204 : ExecForceStoreHeapTuple(trigtuple, oldslot, false);
3182 :
3183 756 : for (i = 0; i < trigdesc->numtriggers; i++)
3184 : {
3185 582 : Trigger *trigger = &trigdesc->triggers[i];
3186 : HeapTuple oldtuple;
3187 :
3188 582 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3189 : TRIGGER_TYPE_ROW,
3190 : TRIGGER_TYPE_INSTEAD,
3191 : TRIGGER_TYPE_UPDATE))
3192 378 : continue;
3193 204 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3194 : NULL, oldslot, newslot))
3195 0 : continue;
3196 :
3197 204 : if (!newtuple)
3198 204 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free);
3199 :
3200 204 : LocTriggerData.tg_trigslot = oldslot;
3201 204 : LocTriggerData.tg_trigtuple = trigtuple;
3202 204 : LocTriggerData.tg_newslot = newslot;
3203 204 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3204 :
3205 204 : LocTriggerData.tg_trigger = trigger;
3206 204 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3207 : i,
3208 : relinfo->ri_TrigFunctions,
3209 : relinfo->ri_TrigInstrument,
3210 204 : GetPerTupleMemoryContext(estate));
3211 192 : if (newtuple == NULL)
3212 : {
3213 18 : return false; /* "do nothing" */
3214 : }
3215 174 : else if (newtuple != oldtuple)
3216 : {
3217 138 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3218 :
3219 138 : if (should_free)
3220 138 : heap_freetuple(oldtuple);
3221 :
3222 : /* signal tuple should be re-fetched if used */
3223 138 : newtuple = NULL;
3224 : }
3225 : }
3226 :
3227 174 : return true;
3228 : }
3229 :
3230 : void
3231 3762 : ExecBSTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3232 : {
3233 : TriggerDesc *trigdesc;
3234 : int i;
3235 3762 : TriggerData LocTriggerData = {0};
3236 :
3237 3762 : trigdesc = relinfo->ri_TrigDesc;
3238 :
3239 3762 : if (trigdesc == NULL)
3240 3750 : return;
3241 914 : if (!trigdesc->trig_truncate_before_statement)
3242 902 : return;
3243 :
3244 12 : LocTriggerData.type = T_TriggerData;
3245 12 : LocTriggerData.tg_event = TRIGGER_EVENT_TRUNCATE |
3246 : TRIGGER_EVENT_BEFORE;
3247 12 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3248 :
3249 36 : for (i = 0; i < trigdesc->numtriggers; i++)
3250 : {
3251 24 : Trigger *trigger = &trigdesc->triggers[i];
3252 : HeapTuple newtuple;
3253 :
3254 24 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3255 : TRIGGER_TYPE_STATEMENT,
3256 : TRIGGER_TYPE_BEFORE,
3257 : TRIGGER_TYPE_TRUNCATE))
3258 12 : continue;
3259 12 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3260 : NULL, NULL, NULL))
3261 0 : continue;
3262 :
3263 12 : LocTriggerData.tg_trigger = trigger;
3264 12 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3265 : i,
3266 : relinfo->ri_TrigFunctions,
3267 : relinfo->ri_TrigInstrument,
3268 12 : GetPerTupleMemoryContext(estate));
3269 :
3270 12 : if (newtuple)
3271 0 : ereport(ERROR,
3272 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
3273 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
3274 : }
3275 : }
3276 :
3277 : void
3278 3754 : ExecASTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3279 : {
3280 3754 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3281 :
3282 3754 : if (trigdesc && trigdesc->trig_truncate_after_statement)
3283 8 : AfterTriggerSaveEvent(estate, relinfo,
3284 : NULL, NULL,
3285 : TRIGGER_EVENT_TRUNCATE,
3286 : false, NULL, NULL, NIL, NULL, NULL,
3287 : false);
3288 3754 : }
3289 :
3290 :
3291 : /*
3292 : * Fetch tuple into "oldslot", dealing with locking and EPQ if necessary
3293 : */
3294 : static bool
3295 12926 : GetTupleForTrigger(EState *estate,
3296 : EPQState *epqstate,
3297 : ResultRelInfo *relinfo,
3298 : ItemPointer tid,
3299 : LockTupleMode lockmode,
3300 : TupleTableSlot *oldslot,
3301 : TupleTableSlot **epqslot,
3302 : TM_Result *tmresultp,
3303 : TM_FailureData *tmfdp)
3304 : {
3305 12926 : Relation relation = relinfo->ri_RelationDesc;
3306 :
3307 12926 : if (epqslot != NULL)
3308 : {
3309 : TM_Result test;
3310 : TM_FailureData tmfd;
3311 2948 : int lockflags = 0;
3312 :
3313 2948 : *epqslot = NULL;
3314 :
3315 : /* caller must pass an epqstate if EvalPlanQual is possible */
3316 : Assert(epqstate != NULL);
3317 :
3318 : /*
3319 : * lock tuple for update
3320 : */
3321 2948 : if (!IsolationUsesXactSnapshot())
3322 2084 : lockflags |= TUPLE_LOCK_FLAG_FIND_LAST_VERSION;
3323 2948 : test = table_tuple_lock(relation, tid, estate->es_snapshot, oldslot,
3324 : estate->es_output_cid,
3325 : lockmode, LockWaitBlock,
3326 : lockflags,
3327 : &tmfd);
3328 :
3329 : /* Let the caller know about the status of this operation */
3330 2944 : if (tmresultp)
3331 216 : *tmresultp = test;
3332 2944 : if (tmfdp)
3333 2938 : *tmfdp = tmfd;
3334 :
3335 2944 : switch (test)
3336 : {
3337 6 : case TM_SelfModified:
3338 :
3339 : /*
3340 : * The target tuple was already updated or deleted by the
3341 : * current command, or by a later command in the current
3342 : * transaction. We ignore the tuple in the former case, and
3343 : * throw error in the latter case, for the same reasons
3344 : * enumerated in ExecUpdate and ExecDelete in
3345 : * nodeModifyTable.c.
3346 : */
3347 6 : if (tmfd.cmax != estate->es_output_cid)
3348 6 : ereport(ERROR,
3349 : (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
3350 : errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
3351 : errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
3352 :
3353 : /* treat it as deleted; do not process */
3354 32 : return false;
3355 :
3356 2920 : case TM_Ok:
3357 2920 : if (tmfd.traversed)
3358 : {
3359 : /*
3360 : * Recheck the tuple using EPQ. For MERGE, we leave this
3361 : * to the caller (it must do additional rechecking, and
3362 : * might end up executing a different action entirely).
3363 : */
3364 26 : if (estate->es_plannedstmt->commandType == CMD_MERGE)
3365 : {
3366 14 : if (tmresultp)
3367 14 : *tmresultp = TM_Updated;
3368 14 : return false;
3369 : }
3370 :
3371 12 : *epqslot = EvalPlanQual(epqstate,
3372 : relation,
3373 : relinfo->ri_RangeTableIndex,
3374 : oldslot);
3375 :
3376 : /*
3377 : * If PlanQual failed for updated tuple - we must not
3378 : * process this tuple!
3379 : */
3380 12 : if (TupIsNull(*epqslot))
3381 : {
3382 4 : *epqslot = NULL;
3383 4 : return false;
3384 : }
3385 : }
3386 2902 : break;
3387 :
3388 2 : case TM_Updated:
3389 2 : if (IsolationUsesXactSnapshot())
3390 2 : ereport(ERROR,
3391 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3392 : errmsg("could not serialize access due to concurrent update")));
3393 0 : elog(ERROR, "unexpected table_tuple_lock status: %u", test);
3394 : break;
3395 :
3396 16 : case TM_Deleted:
3397 16 : if (IsolationUsesXactSnapshot())
3398 2 : ereport(ERROR,
3399 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3400 : errmsg("could not serialize access due to concurrent delete")));
3401 : /* tuple was deleted */
3402 14 : return false;
3403 :
3404 0 : case TM_Invisible:
3405 0 : elog(ERROR, "attempted to lock invisible tuple");
3406 : break;
3407 :
3408 0 : default:
3409 0 : elog(ERROR, "unrecognized table_tuple_lock status: %u", test);
3410 : return false; /* keep compiler quiet */
3411 : }
3412 : }
3413 : else
3414 : {
3415 : /*
3416 : * We expect the tuple to be present, thus very simple error handling
3417 : * suffices.
3418 : */
3419 9978 : if (!table_tuple_fetch_row_version(relation, tid, SnapshotAny,
3420 : oldslot))
3421 0 : elog(ERROR, "failed to fetch tuple for trigger");
3422 : }
3423 :
3424 12880 : return true;
3425 : }
3426 :
3427 : /*
3428 : * Is trigger enabled to fire?
3429 : */
3430 : static bool
3431 24838 : TriggerEnabled(EState *estate, ResultRelInfo *relinfo,
3432 : Trigger *trigger, TriggerEvent event,
3433 : Bitmapset *modifiedCols,
3434 : TupleTableSlot *oldslot, TupleTableSlot *newslot)
3435 : {
3436 : /* Check replication-role-dependent enable state */
3437 24838 : if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
3438 : {
3439 126 : if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
3440 78 : trigger->tgenabled == TRIGGER_DISABLED)
3441 84 : return false;
3442 : }
3443 : else /* ORIGIN or LOCAL role */
3444 : {
3445 24712 : if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
3446 24710 : trigger->tgenabled == TRIGGER_DISABLED)
3447 158 : return false;
3448 : }
3449 :
3450 : /*
3451 : * Check for column-specific trigger (only possible for UPDATE, and in
3452 : * fact we *must* ignore tgattr for other event types)
3453 : */
3454 24596 : if (trigger->tgnattr > 0 && TRIGGER_FIRED_BY_UPDATE(event))
3455 : {
3456 : int i;
3457 : bool modified;
3458 :
3459 430 : modified = false;
3460 562 : for (i = 0; i < trigger->tgnattr; i++)
3461 : {
3462 478 : if (bms_is_member(trigger->tgattr[i] - FirstLowInvalidHeapAttributeNumber,
3463 : modifiedCols))
3464 : {
3465 346 : modified = true;
3466 346 : break;
3467 : }
3468 : }
3469 430 : if (!modified)
3470 84 : return false;
3471 : }
3472 :
3473 : /* Check for WHEN clause */
3474 24512 : if (trigger->tgqual)
3475 : {
3476 : ExprState **predicate;
3477 : ExprContext *econtext;
3478 : MemoryContext oldContext;
3479 : int i;
3480 :
3481 : Assert(estate != NULL);
3482 :
3483 : /*
3484 : * trigger is an element of relinfo->ri_TrigDesc->triggers[]; find the
3485 : * matching element of relinfo->ri_TrigWhenExprs[]
3486 : */
3487 570 : i = trigger - relinfo->ri_TrigDesc->triggers;
3488 570 : predicate = &relinfo->ri_TrigWhenExprs[i];
3489 :
3490 : /*
3491 : * If first time through for this WHEN expression, build expression
3492 : * nodetrees for it. Keep them in the per-query memory context so
3493 : * they'll survive throughout the query.
3494 : */
3495 570 : if (*predicate == NULL)
3496 : {
3497 : Node *tgqual;
3498 :
3499 302 : oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
3500 302 : tgqual = stringToNode(trigger->tgqual);
3501 302 : tgqual = expand_generated_columns_in_expr(tgqual, relinfo->ri_RelationDesc, PRS2_OLD_VARNO);
3502 302 : tgqual = expand_generated_columns_in_expr(tgqual, relinfo->ri_RelationDesc, PRS2_NEW_VARNO);
3503 : /* Change references to OLD and NEW to INNER_VAR and OUTER_VAR */
3504 302 : ChangeVarNodes(tgqual, PRS2_OLD_VARNO, INNER_VAR, 0);
3505 302 : ChangeVarNodes(tgqual, PRS2_NEW_VARNO, OUTER_VAR, 0);
3506 : /* ExecPrepareQual wants implicit-AND form */
3507 302 : tgqual = (Node *) make_ands_implicit((Expr *) tgqual);
3508 302 : *predicate = ExecPrepareQual((List *) tgqual, estate);
3509 302 : MemoryContextSwitchTo(oldContext);
3510 : }
3511 :
3512 : /*
3513 : * We will use the EState's per-tuple context for evaluating WHEN
3514 : * expressions (creating it if it's not already there).
3515 : */
3516 570 : econtext = GetPerTupleExprContext(estate);
3517 :
3518 : /*
3519 : * Finally evaluate the expression, making the old and/or new tuples
3520 : * available as INNER_VAR/OUTER_VAR respectively.
3521 : */
3522 570 : econtext->ecxt_innertuple = oldslot;
3523 570 : econtext->ecxt_outertuple = newslot;
3524 570 : if (!ExecQual(*predicate, econtext))
3525 318 : return false;
3526 : }
3527 :
3528 24194 : return true;
3529 : }
3530 :
3531 :
3532 : /* ----------
3533 : * After-trigger stuff
3534 : *
3535 : * The AfterTriggersData struct holds data about pending AFTER trigger events
3536 : * during the current transaction tree. (BEFORE triggers are fired
3537 : * immediately so we don't need any persistent state about them.) The struct
3538 : * and most of its subsidiary data are kept in TopTransactionContext; however
3539 : * some data that can be discarded sooner appears in the CurTransactionContext
3540 : * of the relevant subtransaction. Also, the individual event records are
3541 : * kept in a separate sub-context of TopTransactionContext. This is done
3542 : * mainly so that it's easy to tell from a memory context dump how much space
3543 : * is being eaten by trigger events.
3544 : *
3545 : * Because the list of pending events can grow large, we go to some
3546 : * considerable effort to minimize per-event memory consumption. The event
3547 : * records are grouped into chunks and common data for similar events in the
3548 : * same chunk is only stored once.
3549 : *
3550 : * XXX We need to be able to save the per-event data in a file if it grows too
3551 : * large.
3552 : * ----------
3553 : */
3554 :
3555 : /* Per-trigger SET CONSTRAINT status */
3556 : typedef struct SetConstraintTriggerData
3557 : {
3558 : Oid sct_tgoid;
3559 : bool sct_tgisdeferred;
3560 : } SetConstraintTriggerData;
3561 :
3562 : typedef struct SetConstraintTriggerData *SetConstraintTrigger;
3563 :
3564 : /*
3565 : * SET CONSTRAINT intra-transaction status.
3566 : *
3567 : * We make this a single palloc'd object so it can be copied and freed easily.
3568 : *
3569 : * all_isset and all_isdeferred are used to keep track
3570 : * of SET CONSTRAINTS ALL {DEFERRED, IMMEDIATE}.
3571 : *
3572 : * trigstates[] stores per-trigger tgisdeferred settings.
3573 : */
3574 : typedef struct SetConstraintStateData
3575 : {
3576 : bool all_isset;
3577 : bool all_isdeferred;
3578 : int numstates; /* number of trigstates[] entries in use */
3579 : int numalloc; /* allocated size of trigstates[] */
3580 : SetConstraintTriggerData trigstates[FLEXIBLE_ARRAY_MEMBER];
3581 : } SetConstraintStateData;
3582 :
3583 : typedef SetConstraintStateData *SetConstraintState;
3584 :
3585 :
3586 : /*
3587 : * Per-trigger-event data
3588 : *
3589 : * The actual per-event data, AfterTriggerEventData, includes DONE/IN_PROGRESS
3590 : * status bits, up to two tuple CTIDs, and optionally two OIDs of partitions.
3591 : * Each event record also has an associated AfterTriggerSharedData that is
3592 : * shared across all instances of similar events within a "chunk".
3593 : *
3594 : * For row-level triggers, we arrange not to waste storage on unneeded ctid
3595 : * fields. Updates of regular tables use two; inserts and deletes of regular
3596 : * tables use one; foreign tables always use zero and save the tuple(s) to a
3597 : * tuplestore. AFTER_TRIGGER_FDW_FETCH directs AfterTriggerExecute() to
3598 : * retrieve a fresh tuple or pair of tuples from that tuplestore, while
3599 : * AFTER_TRIGGER_FDW_REUSE directs it to use the most-recently-retrieved
3600 : * tuple(s). This permits storing tuples once regardless of the number of
3601 : * row-level triggers on a foreign table.
3602 : *
3603 : * When updates on partitioned tables cause rows to move between partitions,
3604 : * the OIDs of both partitions are stored too, so that the tuples can be
3605 : * fetched; such entries are marked AFTER_TRIGGER_CP_UPDATE (for "cross-
3606 : * partition update").
3607 : *
3608 : * Note that we need triggers on foreign tables to be fired in exactly the
3609 : * order they were queued, so that the tuples come out of the tuplestore in
3610 : * the right order. To ensure that, we forbid deferrable (constraint)
3611 : * triggers on foreign tables. This also ensures that such triggers do not
3612 : * get deferred into outer trigger query levels, meaning that it's okay to
3613 : * destroy the tuplestore at the end of the query level.
3614 : *
3615 : * Statement-level triggers always bear AFTER_TRIGGER_1CTID, though they
3616 : * require no ctid field. We lack the flag bit space to neatly represent that
3617 : * distinct case, and it seems unlikely to be worth much trouble.
3618 : *
3619 : * Note: ats_firing_id is initially zero and is set to something else when
3620 : * AFTER_TRIGGER_IN_PROGRESS is set. It indicates which trigger firing
3621 : * cycle the trigger will be fired in (or was fired in, if DONE is set).
3622 : * Although this is mutable state, we can keep it in AfterTriggerSharedData
3623 : * because all instances of the same type of event in a given event list will
3624 : * be fired at the same time, if they were queued between the same firing
3625 : * cycles. So we need only ensure that ats_firing_id is zero when attaching
3626 : * a new event to an existing AfterTriggerSharedData record.
3627 : */
3628 : typedef uint32 TriggerFlags;
3629 :
3630 : #define AFTER_TRIGGER_OFFSET 0x07FFFFFF /* must be low-order bits */
3631 : #define AFTER_TRIGGER_DONE 0x80000000
3632 : #define AFTER_TRIGGER_IN_PROGRESS 0x40000000
3633 : /* bits describing the size and tuple sources of this event */
3634 : #define AFTER_TRIGGER_FDW_REUSE 0x00000000
3635 : #define AFTER_TRIGGER_FDW_FETCH 0x20000000
3636 : #define AFTER_TRIGGER_1CTID 0x10000000
3637 : #define AFTER_TRIGGER_2CTID 0x30000000
3638 : #define AFTER_TRIGGER_CP_UPDATE 0x08000000
3639 : #define AFTER_TRIGGER_TUP_BITS 0x38000000
3640 : typedef struct AfterTriggerSharedData *AfterTriggerShared;
3641 :
3642 : typedef struct AfterTriggerSharedData
3643 : {
3644 : TriggerEvent ats_event; /* event type indicator, see trigger.h */
3645 : Oid ats_tgoid; /* the trigger's ID */
3646 : Oid ats_relid; /* the relation it's on */
3647 : Oid ats_rolid; /* role to execute the trigger */
3648 : CommandId ats_firing_id; /* ID for firing cycle */
3649 : struct AfterTriggersTableData *ats_table; /* transition table access */
3650 : Bitmapset *ats_modifiedcols; /* modified columns */
3651 : } AfterTriggerSharedData;
3652 :
3653 : typedef struct AfterTriggerEventData *AfterTriggerEvent;
3654 :
3655 : typedef struct AfterTriggerEventData
3656 : {
3657 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3658 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3659 : ItemPointerData ate_ctid2; /* new updated tuple */
3660 :
3661 : /*
3662 : * During a cross-partition update of a partitioned table, we also store
3663 : * the OIDs of source and destination partitions that are needed to fetch
3664 : * the old (ctid1) and the new tuple (ctid2) from, respectively.
3665 : */
3666 : Oid ate_src_part;
3667 : Oid ate_dst_part;
3668 : } AfterTriggerEventData;
3669 :
3670 : /* AfterTriggerEventData, minus ate_src_part, ate_dst_part */
3671 : typedef struct AfterTriggerEventDataNoOids
3672 : {
3673 : TriggerFlags ate_flags;
3674 : ItemPointerData ate_ctid1;
3675 : ItemPointerData ate_ctid2;
3676 : } AfterTriggerEventDataNoOids;
3677 :
3678 : /* AfterTriggerEventData, minus ate_*_part and ate_ctid2 */
3679 : typedef struct AfterTriggerEventDataOneCtid
3680 : {
3681 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3682 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3683 : } AfterTriggerEventDataOneCtid;
3684 :
3685 : /* AfterTriggerEventData, minus ate_*_part, ate_ctid1 and ate_ctid2 */
3686 : typedef struct AfterTriggerEventDataZeroCtids
3687 : {
3688 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3689 : } AfterTriggerEventDataZeroCtids;
3690 :
3691 : #define SizeofTriggerEvent(evt) \
3692 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_CP_UPDATE ? \
3693 : sizeof(AfterTriggerEventData) : \
3694 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ? \
3695 : sizeof(AfterTriggerEventDataNoOids) : \
3696 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_1CTID ? \
3697 : sizeof(AfterTriggerEventDataOneCtid) : \
3698 : sizeof(AfterTriggerEventDataZeroCtids))))
3699 :
3700 : #define GetTriggerSharedData(evt) \
3701 : ((AfterTriggerShared) ((char *) (evt) + ((evt)->ate_flags & AFTER_TRIGGER_OFFSET)))
3702 :
3703 : /*
3704 : * To avoid palloc overhead, we keep trigger events in arrays in successively-
3705 : * larger chunks (a slightly more sophisticated version of an expansible
3706 : * array). The space between CHUNK_DATA_START and freeptr is occupied by
3707 : * AfterTriggerEventData records; the space between endfree and endptr is
3708 : * occupied by AfterTriggerSharedData records.
3709 : */
3710 : typedef struct AfterTriggerEventChunk
3711 : {
3712 : struct AfterTriggerEventChunk *next; /* list link */
3713 : char *freeptr; /* start of free space in chunk */
3714 : char *endfree; /* end of free space in chunk */
3715 : char *endptr; /* end of chunk */
3716 : /* event data follows here */
3717 : } AfterTriggerEventChunk;
3718 :
3719 : #define CHUNK_DATA_START(cptr) ((char *) (cptr) + MAXALIGN(sizeof(AfterTriggerEventChunk)))
3720 :
3721 : /* A list of events */
3722 : typedef struct AfterTriggerEventList
3723 : {
3724 : AfterTriggerEventChunk *head;
3725 : AfterTriggerEventChunk *tail;
3726 : char *tailfree; /* freeptr of tail chunk */
3727 : } AfterTriggerEventList;
3728 :
3729 : /* Macros to help in iterating over a list of events */
3730 : #define for_each_chunk(cptr, evtlist) \
3731 : for (cptr = (evtlist).head; cptr != NULL; cptr = cptr->next)
3732 : #define for_each_event(eptr, cptr) \
3733 : for (eptr = (AfterTriggerEvent) CHUNK_DATA_START(cptr); \
3734 : (char *) eptr < (cptr)->freeptr; \
3735 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3736 : /* Use this if no special per-chunk processing is needed */
3737 : #define for_each_event_chunk(eptr, cptr, evtlist) \
3738 : for_each_chunk(cptr, evtlist) for_each_event(eptr, cptr)
3739 :
3740 : /* Macros for iterating from a start point that might not be list start */
3741 : #define for_each_chunk_from(cptr) \
3742 : for (; cptr != NULL; cptr = cptr->next)
3743 : #define for_each_event_from(eptr, cptr) \
3744 : for (; \
3745 : (char *) eptr < (cptr)->freeptr; \
3746 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3747 :
3748 :
3749 : /*
3750 : * All per-transaction data for the AFTER TRIGGERS module.
3751 : *
3752 : * AfterTriggersData has the following fields:
3753 : *
3754 : * firing_counter is incremented for each call of afterTriggerInvokeEvents.
3755 : * We mark firable events with the current firing cycle's ID so that we can
3756 : * tell which ones to work on. This ensures sane behavior if a trigger
3757 : * function chooses to do SET CONSTRAINTS: the inner SET CONSTRAINTS will
3758 : * only fire those events that weren't already scheduled for firing.
3759 : *
3760 : * state keeps track of the transaction-local effects of SET CONSTRAINTS.
3761 : * This is saved and restored across failed subtransactions.
3762 : *
3763 : * events is the current list of deferred events. This is global across
3764 : * all subtransactions of the current transaction. In a subtransaction
3765 : * abort, we know that the events added by the subtransaction are at the
3766 : * end of the list, so it is relatively easy to discard them. The event
3767 : * list chunks themselves are stored in event_cxt.
3768 : *
3769 : * query_depth is the current depth of nested AfterTriggerBeginQuery calls
3770 : * (-1 when the stack is empty).
3771 : *
3772 : * query_stack[query_depth] is the per-query-level data, including these fields:
3773 : *
3774 : * events is a list of AFTER trigger events queued by the current query.
3775 : * None of these are valid until the matching AfterTriggerEndQuery call
3776 : * occurs. At that point we fire immediate-mode triggers, and append any
3777 : * deferred events to the main events list.
3778 : *
3779 : * fdw_tuplestore is a tuplestore containing the foreign-table tuples
3780 : * needed by events queued by the current query. (Note: we use just one
3781 : * tuplestore even though more than one foreign table might be involved.
3782 : * This is okay because tuplestores don't really care what's in the tuples
3783 : * they store; but it's possible that someday it'd break.)
3784 : *
3785 : * tables is a List of AfterTriggersTableData structs for target tables
3786 : * of the current query (see below).
3787 : *
3788 : * maxquerydepth is just the allocated length of query_stack.
3789 : *
3790 : * trans_stack holds per-subtransaction data, including these fields:
3791 : *
3792 : * state is NULL or a pointer to a saved copy of the SET CONSTRAINTS
3793 : * state data. Each subtransaction level that modifies that state first
3794 : * saves a copy, which we use to restore the state if we abort.
3795 : *
3796 : * events is a copy of the events head/tail pointers,
3797 : * which we use to restore those values during subtransaction abort.
3798 : *
3799 : * query_depth is the subtransaction-start-time value of query_depth,
3800 : * which we similarly use to clean up at subtransaction abort.
3801 : *
3802 : * firing_counter is the subtransaction-start-time value of firing_counter.
3803 : * We use this to recognize which deferred triggers were fired (or marked
3804 : * for firing) within an aborted subtransaction.
3805 : *
3806 : * We use GetCurrentTransactionNestLevel() to determine the correct array
3807 : * index in trans_stack. maxtransdepth is the number of allocated entries in
3808 : * trans_stack. (By not keeping our own stack pointer, we can avoid trouble
3809 : * in cases where errors during subxact abort cause multiple invocations
3810 : * of AfterTriggerEndSubXact() at the same nesting depth.)
3811 : *
3812 : * We create an AfterTriggersTableData struct for each target table of the
3813 : * current query, and each operation mode (INSERT/UPDATE/DELETE), that has
3814 : * either transition tables or statement-level triggers. This is used to
3815 : * hold the relevant transition tables, as well as info tracking whether
3816 : * we already queued the statement triggers. (We use that info to prevent
3817 : * firing the same statement triggers more than once per statement, or really
3818 : * once per transition table set.) These structs, along with the transition
3819 : * table tuplestores, live in the (sub)transaction's CurTransactionContext.
3820 : * That's sufficient lifespan because we don't allow transition tables to be
3821 : * used by deferrable triggers, so they only need to survive until
3822 : * AfterTriggerEndQuery.
3823 : */
3824 : typedef struct AfterTriggersQueryData AfterTriggersQueryData;
3825 : typedef struct AfterTriggersTransData AfterTriggersTransData;
3826 : typedef struct AfterTriggersTableData AfterTriggersTableData;
3827 :
3828 : typedef struct AfterTriggersData
3829 : {
3830 : CommandId firing_counter; /* next firing ID to assign */
3831 : SetConstraintState state; /* the active S C state */
3832 : AfterTriggerEventList events; /* deferred-event list */
3833 : MemoryContext event_cxt; /* memory context for events, if any */
3834 :
3835 : /* per-query-level data: */
3836 : AfterTriggersQueryData *query_stack; /* array of structs shown below */
3837 : int query_depth; /* current index in above array */
3838 : int maxquerydepth; /* allocated len of above array */
3839 :
3840 : /* per-subtransaction-level data: */
3841 : AfterTriggersTransData *trans_stack; /* array of structs shown below */
3842 : int maxtransdepth; /* allocated len of above array */
3843 : } AfterTriggersData;
3844 :
3845 : struct AfterTriggersQueryData
3846 : {
3847 : AfterTriggerEventList events; /* events pending from this query */
3848 : Tuplestorestate *fdw_tuplestore; /* foreign tuples for said events */
3849 : List *tables; /* list of AfterTriggersTableData, see below */
3850 : };
3851 :
3852 : struct AfterTriggersTransData
3853 : {
3854 : /* these fields are just for resetting at subtrans abort: */
3855 : SetConstraintState state; /* saved S C state, or NULL if not yet saved */
3856 : AfterTriggerEventList events; /* saved list pointer */
3857 : int query_depth; /* saved query_depth */
3858 : CommandId firing_counter; /* saved firing_counter */
3859 : };
3860 :
3861 : struct AfterTriggersTableData
3862 : {
3863 : /* relid + cmdType form the lookup key for these structs: */
3864 : Oid relid; /* target table's OID */
3865 : CmdType cmdType; /* event type, CMD_INSERT/UPDATE/DELETE */
3866 : bool closed; /* true when no longer OK to add tuples */
3867 : bool before_trig_done; /* did we already queue BS triggers? */
3868 : bool after_trig_done; /* did we already queue AS triggers? */
3869 : AfterTriggerEventList after_trig_events; /* if so, saved list pointer */
3870 :
3871 : /*
3872 : * We maintain separate transition tables for UPDATE/INSERT/DELETE since
3873 : * MERGE can run all three actions in a single statement. Note that UPDATE
3874 : * needs both old and new transition tables whereas INSERT needs only new,
3875 : * and DELETE needs only old.
3876 : */
3877 :
3878 : /* "old" transition table for UPDATE, if any */
3879 : Tuplestorestate *old_upd_tuplestore;
3880 : /* "new" transition table for UPDATE, if any */
3881 : Tuplestorestate *new_upd_tuplestore;
3882 : /* "old" transition table for DELETE, if any */
3883 : Tuplestorestate *old_del_tuplestore;
3884 : /* "new" transition table for INSERT, if any */
3885 : Tuplestorestate *new_ins_tuplestore;
3886 :
3887 : TupleTableSlot *storeslot; /* for converting to tuplestore's format */
3888 : };
3889 :
3890 : static AfterTriggersData afterTriggers;
3891 :
3892 : static void AfterTriggerExecute(EState *estate,
3893 : AfterTriggerEvent event,
3894 : ResultRelInfo *relInfo,
3895 : ResultRelInfo *src_relInfo,
3896 : ResultRelInfo *dst_relInfo,
3897 : TriggerDesc *trigdesc,
3898 : FmgrInfo *finfo,
3899 : Instrumentation *instr,
3900 : MemoryContext per_tuple_context,
3901 : TupleTableSlot *trig_tuple_slot1,
3902 : TupleTableSlot *trig_tuple_slot2);
3903 : static AfterTriggersTableData *GetAfterTriggersTableData(Oid relid,
3904 : CmdType cmdType);
3905 : static TupleTableSlot *GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
3906 : TupleDesc tupdesc);
3907 : static Tuplestorestate *GetAfterTriggersTransitionTable(int event,
3908 : TupleTableSlot *oldslot,
3909 : TupleTableSlot *newslot,
3910 : TransitionCaptureState *transition_capture);
3911 : static void TransitionTableAddTuple(EState *estate,
3912 : TransitionCaptureState *transition_capture,
3913 : ResultRelInfo *relinfo,
3914 : TupleTableSlot *slot,
3915 : TupleTableSlot *original_insert_tuple,
3916 : Tuplestorestate *tuplestore);
3917 : static void AfterTriggerFreeQuery(AfterTriggersQueryData *qs);
3918 : static SetConstraintState SetConstraintStateCreate(int numalloc);
3919 : static SetConstraintState SetConstraintStateCopy(SetConstraintState origstate);
3920 : static SetConstraintState SetConstraintStateAddItem(SetConstraintState state,
3921 : Oid tgoid, bool tgisdeferred);
3922 : static void cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent);
3923 :
3924 :
3925 : /*
3926 : * Get the FDW tuplestore for the current trigger query level, creating it
3927 : * if necessary.
3928 : */
3929 : static Tuplestorestate *
3930 100 : GetCurrentFDWTuplestore(void)
3931 : {
3932 : Tuplestorestate *ret;
3933 :
3934 100 : ret = afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore;
3935 100 : if (ret == NULL)
3936 : {
3937 : MemoryContext oldcxt;
3938 : ResourceOwner saveResourceOwner;
3939 :
3940 : /*
3941 : * Make the tuplestore valid until end of subtransaction. We really
3942 : * only need it until AfterTriggerEndQuery().
3943 : */
3944 36 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
3945 36 : saveResourceOwner = CurrentResourceOwner;
3946 36 : CurrentResourceOwner = CurTransactionResourceOwner;
3947 :
3948 36 : ret = tuplestore_begin_heap(false, false, work_mem);
3949 :
3950 36 : CurrentResourceOwner = saveResourceOwner;
3951 36 : MemoryContextSwitchTo(oldcxt);
3952 :
3953 36 : afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore = ret;
3954 : }
3955 :
3956 100 : return ret;
3957 : }
3958 :
3959 : /* ----------
3960 : * afterTriggerCheckState()
3961 : *
3962 : * Returns true if the trigger event is actually in state DEFERRED.
3963 : * ----------
3964 : */
3965 : static bool
3966 11984 : afterTriggerCheckState(AfterTriggerShared evtshared)
3967 : {
3968 11984 : Oid tgoid = evtshared->ats_tgoid;
3969 11984 : SetConstraintState state = afterTriggers.state;
3970 : int i;
3971 :
3972 : /*
3973 : * For not-deferrable triggers (i.e. normal AFTER ROW triggers and
3974 : * constraints declared NOT DEFERRABLE), the state is always false.
3975 : */
3976 11984 : if ((evtshared->ats_event & AFTER_TRIGGER_DEFERRABLE) == 0)
3977 11246 : return false;
3978 :
3979 : /*
3980 : * If constraint state exists, SET CONSTRAINTS might have been executed
3981 : * either for this trigger or for all triggers.
3982 : */
3983 738 : if (state != NULL)
3984 : {
3985 : /* Check for SET CONSTRAINTS for this specific trigger. */
3986 318 : for (i = 0; i < state->numstates; i++)
3987 : {
3988 252 : if (state->trigstates[i].sct_tgoid == tgoid)
3989 60 : return state->trigstates[i].sct_tgisdeferred;
3990 : }
3991 :
3992 : /* Check for SET CONSTRAINTS ALL. */
3993 66 : if (state->all_isset)
3994 54 : return state->all_isdeferred;
3995 : }
3996 :
3997 : /*
3998 : * Otherwise return the default state for the trigger.
3999 : */
4000 624 : return ((evtshared->ats_event & AFTER_TRIGGER_INITDEFERRED) != 0);
4001 : }
4002 :
4003 : /* ----------
4004 : * afterTriggerCopyBitmap()
4005 : *
4006 : * Copy bitmap into AfterTriggerEvents memory context, which is where the after
4007 : * trigger events are kept.
4008 : * ----------
4009 : */
4010 : static Bitmapset *
4011 11134 : afterTriggerCopyBitmap(Bitmapset *src)
4012 : {
4013 : Bitmapset *dst;
4014 : MemoryContext oldcxt;
4015 :
4016 11134 : if (src == NULL)
4017 7770 : return NULL;
4018 :
4019 3364 : oldcxt = MemoryContextSwitchTo(afterTriggers.event_cxt);
4020 :
4021 3364 : dst = bms_copy(src);
4022 :
4023 3364 : MemoryContextSwitchTo(oldcxt);
4024 :
4025 3364 : return dst;
4026 : }
4027 :
4028 : /* ----------
4029 : * afterTriggerAddEvent()
4030 : *
4031 : * Add a new trigger event to the specified queue.
4032 : * The passed-in event data is copied.
4033 : * ----------
4034 : */
4035 : static void
4036 12658 : afterTriggerAddEvent(AfterTriggerEventList *events,
4037 : AfterTriggerEvent event, AfterTriggerShared evtshared)
4038 : {
4039 12658 : Size eventsize = SizeofTriggerEvent(event);
4040 12658 : Size needed = eventsize + sizeof(AfterTriggerSharedData);
4041 : AfterTriggerEventChunk *chunk;
4042 : AfterTriggerShared newshared;
4043 : AfterTriggerEvent newevent;
4044 :
4045 : /*
4046 : * If empty list or not enough room in the tail chunk, make a new chunk.
4047 : * We assume here that a new shared record will always be needed.
4048 : */
4049 12658 : chunk = events->tail;
4050 12658 : if (chunk == NULL ||
4051 4680 : chunk->endfree - chunk->freeptr < needed)
4052 : {
4053 : Size chunksize;
4054 :
4055 : /* Create event context if we didn't already */
4056 7978 : if (afterTriggers.event_cxt == NULL)
4057 6752 : afterTriggers.event_cxt =
4058 6752 : AllocSetContextCreate(TopTransactionContext,
4059 : "AfterTriggerEvents",
4060 : ALLOCSET_DEFAULT_SIZES);
4061 :
4062 : /*
4063 : * Chunk size starts at 1KB and is allowed to increase up to 1MB.
4064 : * These numbers are fairly arbitrary, though there is a hard limit at
4065 : * AFTER_TRIGGER_OFFSET; else we couldn't link event records to their
4066 : * shared records using the available space in ate_flags. Another
4067 : * constraint is that if the chunk size gets too huge, the search loop
4068 : * below would get slow given a (not too common) usage pattern with
4069 : * many distinct event types in a chunk. Therefore, we double the
4070 : * preceding chunk size only if there weren't too many shared records
4071 : * in the preceding chunk; otherwise we halve it. This gives us some
4072 : * ability to adapt to the actual usage pattern of the current query
4073 : * while still having large chunk sizes in typical usage. All chunk
4074 : * sizes used should be MAXALIGN multiples, to ensure that the shared
4075 : * records will be aligned safely.
4076 : */
4077 : #define MIN_CHUNK_SIZE 1024
4078 : #define MAX_CHUNK_SIZE (1024*1024)
4079 :
4080 : #if MAX_CHUNK_SIZE > (AFTER_TRIGGER_OFFSET+1)
4081 : #error MAX_CHUNK_SIZE must not exceed AFTER_TRIGGER_OFFSET
4082 : #endif
4083 :
4084 7978 : if (chunk == NULL)
4085 7978 : chunksize = MIN_CHUNK_SIZE;
4086 : else
4087 : {
4088 : /* preceding chunk size... */
4089 0 : chunksize = chunk->endptr - (char *) chunk;
4090 : /* check number of shared records in preceding chunk */
4091 0 : if ((chunk->endptr - chunk->endfree) <=
4092 : (100 * sizeof(AfterTriggerSharedData)))
4093 0 : chunksize *= 2; /* okay, double it */
4094 : else
4095 0 : chunksize /= 2; /* too many shared records */
4096 0 : chunksize = Min(chunksize, MAX_CHUNK_SIZE);
4097 : }
4098 7978 : chunk = MemoryContextAlloc(afterTriggers.event_cxt, chunksize);
4099 7978 : chunk->next = NULL;
4100 7978 : chunk->freeptr = CHUNK_DATA_START(chunk);
4101 7978 : chunk->endptr = chunk->endfree = (char *) chunk + chunksize;
4102 : Assert(chunk->endfree - chunk->freeptr >= needed);
4103 :
4104 7978 : if (events->tail == NULL)
4105 : {
4106 : Assert(events->head == NULL);
4107 7978 : events->head = chunk;
4108 : }
4109 : else
4110 0 : events->tail->next = chunk;
4111 7978 : events->tail = chunk;
4112 : /* events->tailfree is now out of sync, but we'll fix it below */
4113 : }
4114 :
4115 : /*
4116 : * Try to locate a matching shared-data record already in the chunk. If
4117 : * none, make a new one. The search begins with the most recently added
4118 : * record, since newer ones are most likely to match.
4119 : */
4120 12658 : for (newshared = (AfterTriggerShared) chunk->endfree;
4121 17860 : (char *) newshared < chunk->endptr;
4122 5202 : newshared++)
4123 : {
4124 : /* compare fields roughly by probability of them being different */
4125 6726 : if (newshared->ats_tgoid == evtshared->ats_tgoid &&
4126 1742 : newshared->ats_event == evtshared->ats_event &&
4127 1736 : newshared->ats_firing_id == 0 &&
4128 1562 : newshared->ats_table == evtshared->ats_table &&
4129 1562 : newshared->ats_relid == evtshared->ats_relid &&
4130 3118 : newshared->ats_rolid == evtshared->ats_rolid &&
4131 1556 : bms_equal(newshared->ats_modifiedcols,
4132 1556 : evtshared->ats_modifiedcols))
4133 1524 : break;
4134 : }
4135 12658 : if ((char *) newshared >= chunk->endptr)
4136 : {
4137 11134 : newshared = ((AfterTriggerShared) chunk->endfree) - 1;
4138 11134 : *newshared = *evtshared;
4139 : /* now we must make a suitably-long-lived copy of the bitmap */
4140 11134 : newshared->ats_modifiedcols = afterTriggerCopyBitmap(evtshared->ats_modifiedcols);
4141 11134 : newshared->ats_firing_id = 0; /* just to be sure */
4142 11134 : chunk->endfree = (char *) newshared;
4143 : }
4144 :
4145 : /* Insert the data */
4146 12658 : newevent = (AfterTriggerEvent) chunk->freeptr;
4147 12658 : memcpy(newevent, event, eventsize);
4148 : /* ... and link the new event to its shared record */
4149 12658 : newevent->ate_flags &= ~AFTER_TRIGGER_OFFSET;
4150 12658 : newevent->ate_flags |= (char *) newshared - (char *) newevent;
4151 :
4152 12658 : chunk->freeptr += eventsize;
4153 12658 : events->tailfree = chunk->freeptr;
4154 12658 : }
4155 :
4156 : /* ----------
4157 : * afterTriggerFreeEventList()
4158 : *
4159 : * Free all the event storage in the given list.
4160 : * ----------
4161 : */
4162 : static void
4163 17130 : afterTriggerFreeEventList(AfterTriggerEventList *events)
4164 : {
4165 : AfterTriggerEventChunk *chunk;
4166 :
4167 23582 : while ((chunk = events->head) != NULL)
4168 : {
4169 6452 : events->head = chunk->next;
4170 6452 : pfree(chunk);
4171 : }
4172 17130 : events->tail = NULL;
4173 17130 : events->tailfree = NULL;
4174 17130 : }
4175 :
4176 : /* ----------
4177 : * afterTriggerRestoreEventList()
4178 : *
4179 : * Restore an event list to its prior length, removing all the events
4180 : * added since it had the value old_events.
4181 : * ----------
4182 : */
4183 : static void
4184 9276 : afterTriggerRestoreEventList(AfterTriggerEventList *events,
4185 : const AfterTriggerEventList *old_events)
4186 : {
4187 : AfterTriggerEventChunk *chunk;
4188 : AfterTriggerEventChunk *next_chunk;
4189 :
4190 9276 : if (old_events->tail == NULL)
4191 : {
4192 : /* restoring to a completely empty state, so free everything */
4193 9254 : afterTriggerFreeEventList(events);
4194 : }
4195 : else
4196 : {
4197 22 : *events = *old_events;
4198 : /* free any chunks after the last one we want to keep */
4199 22 : for (chunk = events->tail->next; chunk != NULL; chunk = next_chunk)
4200 : {
4201 0 : next_chunk = chunk->next;
4202 0 : pfree(chunk);
4203 : }
4204 : /* and clean up the tail chunk to be the right length */
4205 22 : events->tail->next = NULL;
4206 22 : events->tail->freeptr = events->tailfree;
4207 :
4208 : /*
4209 : * We don't make any effort to remove now-unused shared data records.
4210 : * They might still be useful, anyway.
4211 : */
4212 : }
4213 9276 : }
4214 :
4215 : /* ----------
4216 : * afterTriggerDeleteHeadEventChunk()
4217 : *
4218 : * Remove the first chunk of events from the query level's event list.
4219 : * Keep any event list pointers elsewhere in the query level's data
4220 : * structures in sync.
4221 : * ----------
4222 : */
4223 : static void
4224 0 : afterTriggerDeleteHeadEventChunk(AfterTriggersQueryData *qs)
4225 : {
4226 0 : AfterTriggerEventChunk *target = qs->events.head;
4227 : ListCell *lc;
4228 :
4229 : Assert(target && target->next);
4230 :
4231 : /*
4232 : * First, update any pointers in the per-table data, so that they won't be
4233 : * dangling. Resetting obsoleted pointers to NULL will make
4234 : * cancel_prior_stmt_triggers start from the list head, which is fine.
4235 : */
4236 0 : foreach(lc, qs->tables)
4237 : {
4238 0 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
4239 :
4240 0 : if (table->after_trig_done &&
4241 0 : table->after_trig_events.tail == target)
4242 : {
4243 0 : table->after_trig_events.head = NULL;
4244 0 : table->after_trig_events.tail = NULL;
4245 0 : table->after_trig_events.tailfree = NULL;
4246 : }
4247 : }
4248 :
4249 : /* Now we can flush the head chunk */
4250 0 : qs->events.head = target->next;
4251 0 : pfree(target);
4252 0 : }
4253 :
4254 :
4255 : /* ----------
4256 : * AfterTriggerExecute()
4257 : *
4258 : * Fetch the required tuples back from the heap and fire one
4259 : * single trigger function.
4260 : *
4261 : * Frequently, this will be fired many times in a row for triggers of
4262 : * a single relation. Therefore, we cache the open relation and provide
4263 : * fmgr lookup cache space at the caller level. (For triggers fired at
4264 : * the end of a query, we can even piggyback on the executor's state.)
4265 : *
4266 : * When fired for a cross-partition update of a partitioned table, the old
4267 : * tuple is fetched using 'src_relInfo' (the source leaf partition) and
4268 : * the new tuple using 'dst_relInfo' (the destination leaf partition), though
4269 : * both are converted into the root partitioned table's format before passing
4270 : * to the trigger function.
4271 : *
4272 : * event: event currently being fired.
4273 : * relInfo: result relation for event.
4274 : * src_relInfo: source partition of a cross-partition update
4275 : * dst_relInfo: its destination partition
4276 : * trigdesc: working copy of rel's trigger info.
4277 : * finfo: array of fmgr lookup cache entries (one per trigger in trigdesc).
4278 : * instr: array of EXPLAIN ANALYZE instrumentation nodes (one per trigger),
4279 : * or NULL if no instrumentation is wanted.
4280 : * per_tuple_context: memory context to call trigger function in.
4281 : * trig_tuple_slot1: scratch slot for tg_trigtuple (foreign tables only)
4282 : * trig_tuple_slot2: scratch slot for tg_newtuple (foreign tables only)
4283 : * ----------
4284 : */
4285 : static void
4286 11688 : AfterTriggerExecute(EState *estate,
4287 : AfterTriggerEvent event,
4288 : ResultRelInfo *relInfo,
4289 : ResultRelInfo *src_relInfo,
4290 : ResultRelInfo *dst_relInfo,
4291 : TriggerDesc *trigdesc,
4292 : FmgrInfo *finfo, Instrumentation *instr,
4293 : MemoryContext per_tuple_context,
4294 : TupleTableSlot *trig_tuple_slot1,
4295 : TupleTableSlot *trig_tuple_slot2)
4296 : {
4297 11688 : Relation rel = relInfo->ri_RelationDesc;
4298 11688 : Relation src_rel = src_relInfo->ri_RelationDesc;
4299 11688 : Relation dst_rel = dst_relInfo->ri_RelationDesc;
4300 11688 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4301 11688 : Oid tgoid = evtshared->ats_tgoid;
4302 11688 : TriggerData LocTriggerData = {0};
4303 : Oid save_rolid;
4304 : int save_sec_context;
4305 : HeapTuple rettuple;
4306 : int tgindx;
4307 11688 : bool should_free_trig = false;
4308 11688 : bool should_free_new = false;
4309 :
4310 : /*
4311 : * Locate trigger in trigdesc. It might not be present, and in fact the
4312 : * trigdesc could be NULL, if the trigger was dropped since the event was
4313 : * queued. In that case, silently do nothing.
4314 : */
4315 11688 : if (trigdesc == NULL)
4316 6 : return;
4317 25980 : for (tgindx = 0; tgindx < trigdesc->numtriggers; tgindx++)
4318 : {
4319 25980 : if (trigdesc->triggers[tgindx].tgoid == tgoid)
4320 : {
4321 11682 : LocTriggerData.tg_trigger = &(trigdesc->triggers[tgindx]);
4322 11682 : break;
4323 : }
4324 : }
4325 11682 : if (LocTriggerData.tg_trigger == NULL)
4326 0 : return;
4327 :
4328 : /*
4329 : * If doing EXPLAIN ANALYZE, start charging time to this trigger. We want
4330 : * to include time spent re-fetching tuples in the trigger cost.
4331 : */
4332 11682 : if (instr)
4333 0 : InstrStartNode(instr + tgindx);
4334 :
4335 : /*
4336 : * Fetch the required tuple(s).
4337 : */
4338 11682 : switch (event->ate_flags & AFTER_TRIGGER_TUP_BITS)
4339 : {
4340 50 : case AFTER_TRIGGER_FDW_FETCH:
4341 : {
4342 50 : Tuplestorestate *fdw_tuplestore = GetCurrentFDWTuplestore();
4343 :
4344 50 : if (!tuplestore_gettupleslot(fdw_tuplestore, true, false,
4345 : trig_tuple_slot1))
4346 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4347 :
4348 50 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4349 18 : TRIGGER_EVENT_UPDATE &&
4350 18 : !tuplestore_gettupleslot(fdw_tuplestore, true, false,
4351 : trig_tuple_slot2))
4352 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4353 : }
4354 : /* fall through */
4355 : case AFTER_TRIGGER_FDW_REUSE:
4356 :
4357 : /*
4358 : * Store tuple in the slot so that tg_trigtuple does not reference
4359 : * tuplestore memory. (It is formally possible for the trigger
4360 : * function to queue trigger events that add to the same
4361 : * tuplestore, which can push other tuples out of memory.) The
4362 : * distinction is academic, because we start with a minimal tuple
4363 : * that is stored as a heap tuple, constructed in different memory
4364 : * context, in the slot anyway.
4365 : */
4366 58 : LocTriggerData.tg_trigslot = trig_tuple_slot1;
4367 58 : LocTriggerData.tg_trigtuple =
4368 58 : ExecFetchSlotHeapTuple(trig_tuple_slot1, true, &should_free_trig);
4369 :
4370 58 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4371 : TRIGGER_EVENT_UPDATE)
4372 : {
4373 22 : LocTriggerData.tg_newslot = trig_tuple_slot2;
4374 22 : LocTriggerData.tg_newtuple =
4375 22 : ExecFetchSlotHeapTuple(trig_tuple_slot2, true, &should_free_new);
4376 : }
4377 : else
4378 : {
4379 36 : LocTriggerData.tg_newtuple = NULL;
4380 : }
4381 58 : break;
4382 :
4383 11624 : default:
4384 11624 : if (ItemPointerIsValid(&(event->ate_ctid1)))
4385 : {
4386 10590 : TupleTableSlot *src_slot = ExecGetTriggerOldSlot(estate,
4387 : src_relInfo);
4388 :
4389 10590 : if (!table_tuple_fetch_row_version(src_rel,
4390 : &(event->ate_ctid1),
4391 : SnapshotAny,
4392 : src_slot))
4393 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4394 :
4395 : /*
4396 : * Store the tuple fetched from the source partition into the
4397 : * target (root partitioned) table slot, converting if needed.
4398 : */
4399 10590 : if (src_relInfo != relInfo)
4400 : {
4401 144 : TupleConversionMap *map = ExecGetChildToRootMap(src_relInfo);
4402 :
4403 144 : LocTriggerData.tg_trigslot = ExecGetTriggerOldSlot(estate, relInfo);
4404 144 : if (map)
4405 : {
4406 36 : execute_attr_map_slot(map->attrMap,
4407 : src_slot,
4408 : LocTriggerData.tg_trigslot);
4409 : }
4410 : else
4411 108 : ExecCopySlot(LocTriggerData.tg_trigslot, src_slot);
4412 : }
4413 : else
4414 10446 : LocTriggerData.tg_trigslot = src_slot;
4415 10590 : LocTriggerData.tg_trigtuple =
4416 10590 : ExecFetchSlotHeapTuple(LocTriggerData.tg_trigslot, false, &should_free_trig);
4417 : }
4418 : else
4419 : {
4420 1034 : LocTriggerData.tg_trigtuple = NULL;
4421 : }
4422 :
4423 : /* don't touch ctid2 if not there */
4424 11624 : if (((event->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ||
4425 11768 : (event->ate_flags & AFTER_TRIGGER_CP_UPDATE)) &&
4426 3178 : ItemPointerIsValid(&(event->ate_ctid2)))
4427 3178 : {
4428 3178 : TupleTableSlot *dst_slot = ExecGetTriggerNewSlot(estate,
4429 : dst_relInfo);
4430 :
4431 3178 : if (!table_tuple_fetch_row_version(dst_rel,
4432 : &(event->ate_ctid2),
4433 : SnapshotAny,
4434 : dst_slot))
4435 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4436 :
4437 : /*
4438 : * Store the tuple fetched from the destination partition into
4439 : * the target (root partitioned) table slot, converting if
4440 : * needed.
4441 : */
4442 3178 : if (dst_relInfo != relInfo)
4443 : {
4444 144 : TupleConversionMap *map = ExecGetChildToRootMap(dst_relInfo);
4445 :
4446 144 : LocTriggerData.tg_newslot = ExecGetTriggerNewSlot(estate, relInfo);
4447 144 : if (map)
4448 : {
4449 36 : execute_attr_map_slot(map->attrMap,
4450 : dst_slot,
4451 : LocTriggerData.tg_newslot);
4452 : }
4453 : else
4454 108 : ExecCopySlot(LocTriggerData.tg_newslot, dst_slot);
4455 : }
4456 : else
4457 3034 : LocTriggerData.tg_newslot = dst_slot;
4458 3178 : LocTriggerData.tg_newtuple =
4459 3178 : ExecFetchSlotHeapTuple(LocTriggerData.tg_newslot, false, &should_free_new);
4460 : }
4461 : else
4462 : {
4463 8446 : LocTriggerData.tg_newtuple = NULL;
4464 : }
4465 : }
4466 :
4467 : /*
4468 : * Set up the tuplestore information to let the trigger have access to
4469 : * transition tables. When we first make a transition table available to
4470 : * a trigger, mark it "closed" so that it cannot change anymore. If any
4471 : * additional events of the same type get queued in the current trigger
4472 : * query level, they'll go into new transition tables.
4473 : */
4474 11682 : LocTriggerData.tg_oldtable = LocTriggerData.tg_newtable = NULL;
4475 11682 : if (evtshared->ats_table)
4476 : {
4477 564 : if (LocTriggerData.tg_trigger->tgoldtable)
4478 : {
4479 312 : if (TRIGGER_FIRED_BY_UPDATE(evtshared->ats_event))
4480 162 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_upd_tuplestore;
4481 : else
4482 150 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_del_tuplestore;
4483 312 : evtshared->ats_table->closed = true;
4484 : }
4485 :
4486 564 : if (LocTriggerData.tg_trigger->tgnewtable)
4487 : {
4488 402 : if (TRIGGER_FIRED_BY_INSERT(evtshared->ats_event))
4489 222 : LocTriggerData.tg_newtable = evtshared->ats_table->new_ins_tuplestore;
4490 : else
4491 180 : LocTriggerData.tg_newtable = evtshared->ats_table->new_upd_tuplestore;
4492 402 : evtshared->ats_table->closed = true;
4493 : }
4494 : }
4495 :
4496 : /*
4497 : * Setup the remaining trigger information
4498 : */
4499 11682 : LocTriggerData.type = T_TriggerData;
4500 11682 : LocTriggerData.tg_event =
4501 11682 : evtshared->ats_event & (TRIGGER_EVENT_OPMASK | TRIGGER_EVENT_ROW);
4502 11682 : LocTriggerData.tg_relation = rel;
4503 11682 : if (TRIGGER_FOR_UPDATE(LocTriggerData.tg_trigger->tgtype))
4504 5486 : LocTriggerData.tg_updatedcols = evtshared->ats_modifiedcols;
4505 :
4506 11682 : MemoryContextReset(per_tuple_context);
4507 :
4508 : /*
4509 : * If necessary, become the role that was active when the trigger got
4510 : * queued. Note that the role might have been dropped since the trigger
4511 : * was queued, but if that is a problem, we will get an error later.
4512 : * Checking here would still leave a race condition.
4513 : */
4514 11682 : GetUserIdAndSecContext(&save_rolid, &save_sec_context);
4515 11682 : if (save_rolid != evtshared->ats_rolid)
4516 24 : SetUserIdAndSecContext(evtshared->ats_rolid,
4517 : save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
4518 :
4519 : /*
4520 : * Call the trigger and throw away any possibly returned updated tuple.
4521 : * (Don't let ExecCallTriggerFunc measure EXPLAIN time.)
4522 : */
4523 11682 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
4524 : tgindx,
4525 : finfo,
4526 : NULL,
4527 : per_tuple_context);
4528 10404 : if (rettuple != NULL &&
4529 3374 : rettuple != LocTriggerData.tg_trigtuple &&
4530 1430 : rettuple != LocTriggerData.tg_newtuple)
4531 0 : heap_freetuple(rettuple);
4532 :
4533 : /* Restore the current role if necessary */
4534 10404 : if (save_rolid != evtshared->ats_rolid)
4535 18 : SetUserIdAndSecContext(save_rolid, save_sec_context);
4536 :
4537 : /*
4538 : * Release resources
4539 : */
4540 10404 : if (should_free_trig)
4541 172 : heap_freetuple(LocTriggerData.tg_trigtuple);
4542 10404 : if (should_free_new)
4543 136 : heap_freetuple(LocTriggerData.tg_newtuple);
4544 :
4545 : /* don't clear slots' contents if foreign table */
4546 10404 : if (trig_tuple_slot1 == NULL)
4547 : {
4548 10334 : if (LocTriggerData.tg_trigslot)
4549 9360 : ExecClearTuple(LocTriggerData.tg_trigslot);
4550 10334 : if (LocTriggerData.tg_newslot)
4551 2808 : ExecClearTuple(LocTriggerData.tg_newslot);
4552 : }
4553 :
4554 : /*
4555 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
4556 : * one "tuple returned" (really the number of firings).
4557 : */
4558 10404 : if (instr)
4559 0 : InstrStopNode(instr + tgindx, 1);
4560 : }
4561 :
4562 :
4563 : /*
4564 : * afterTriggerMarkEvents()
4565 : *
4566 : * Scan the given event list for not yet invoked events. Mark the ones
4567 : * that can be invoked now with the current firing ID.
4568 : *
4569 : * If move_list isn't NULL, events that are not to be invoked now are
4570 : * transferred to move_list.
4571 : *
4572 : * When immediate_only is true, do not invoke currently-deferred triggers.
4573 : * (This will be false only at main transaction exit.)
4574 : *
4575 : * Returns true if any invokable events were found.
4576 : */
4577 : static bool
4578 773684 : afterTriggerMarkEvents(AfterTriggerEventList *events,
4579 : AfterTriggerEventList *move_list,
4580 : bool immediate_only)
4581 : {
4582 773684 : bool found = false;
4583 773684 : bool deferred_found = false;
4584 : AfterTriggerEvent event;
4585 : AfterTriggerEventChunk *chunk;
4586 :
4587 795228 : for_each_event_chunk(event, chunk, *events)
4588 : {
4589 13340 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4590 13340 : bool defer_it = false;
4591 :
4592 13340 : if (!(event->ate_flags &
4593 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS)))
4594 : {
4595 : /*
4596 : * This trigger hasn't been called or scheduled yet. Check if we
4597 : * should call it now.
4598 : */
4599 12506 : if (immediate_only && afterTriggerCheckState(evtshared))
4600 : {
4601 618 : defer_it = true;
4602 : }
4603 : else
4604 : {
4605 : /*
4606 : * Mark it as to be fired in this firing cycle.
4607 : */
4608 11888 : evtshared->ats_firing_id = afterTriggers.firing_counter;
4609 11888 : event->ate_flags |= AFTER_TRIGGER_IN_PROGRESS;
4610 11888 : found = true;
4611 : }
4612 : }
4613 :
4614 : /*
4615 : * If it's deferred, move it to move_list, if requested.
4616 : */
4617 13340 : if (defer_it && move_list != NULL)
4618 : {
4619 618 : deferred_found = true;
4620 : /* add it to move_list */
4621 618 : afterTriggerAddEvent(move_list, event, evtshared);
4622 : /* mark original copy "done" so we don't do it again */
4623 618 : event->ate_flags |= AFTER_TRIGGER_DONE;
4624 : }
4625 : }
4626 :
4627 : /*
4628 : * We could allow deferred triggers if, before the end of the
4629 : * security-restricted operation, we were to verify that a SET CONSTRAINTS
4630 : * ... IMMEDIATE has fired all such triggers. For now, don't bother.
4631 : */
4632 773684 : if (deferred_found && InSecurityRestrictedOperation())
4633 12 : ereport(ERROR,
4634 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4635 : errmsg("cannot fire deferred trigger within security-restricted operation")));
4636 :
4637 773672 : return found;
4638 : }
4639 :
4640 : /*
4641 : * afterTriggerInvokeEvents()
4642 : *
4643 : * Scan the given event list for events that are marked as to be fired
4644 : * in the current firing cycle, and fire them.
4645 : *
4646 : * If estate isn't NULL, we use its result relation info to avoid repeated
4647 : * openings and closing of trigger target relations. If it is NULL, we
4648 : * make one locally to cache the info in case there are multiple trigger
4649 : * events per rel.
4650 : *
4651 : * When delete_ok is true, it's safe to delete fully-processed events.
4652 : * (We are not very tense about that: we simply reset a chunk to be empty
4653 : * if all its events got fired. The objective here is just to avoid useless
4654 : * rescanning of events when a trigger queues new events during transaction
4655 : * end, so it's not necessary to worry much about the case where only
4656 : * some events are fired.)
4657 : *
4658 : * Returns true if no unfired events remain in the list (this allows us
4659 : * to avoid repeating afterTriggerMarkEvents).
4660 : */
4661 : static bool
4662 7736 : afterTriggerInvokeEvents(AfterTriggerEventList *events,
4663 : CommandId firing_id,
4664 : EState *estate,
4665 : bool delete_ok)
4666 : {
4667 7736 : bool all_fired = true;
4668 : AfterTriggerEventChunk *chunk;
4669 : MemoryContext per_tuple_context;
4670 7736 : bool local_estate = false;
4671 7736 : ResultRelInfo *rInfo = NULL;
4672 7736 : Relation rel = NULL;
4673 7736 : TriggerDesc *trigdesc = NULL;
4674 7736 : FmgrInfo *finfo = NULL;
4675 7736 : Instrumentation *instr = NULL;
4676 7736 : TupleTableSlot *slot1 = NULL,
4677 7736 : *slot2 = NULL;
4678 :
4679 : /* Make a local EState if need be */
4680 7736 : if (estate == NULL)
4681 : {
4682 362 : estate = CreateExecutorState();
4683 362 : local_estate = true;
4684 : }
4685 :
4686 : /* Make a per-tuple memory context for trigger function calls */
4687 : per_tuple_context =
4688 7736 : AllocSetContextCreate(CurrentMemoryContext,
4689 : "AfterTriggerTupleContext",
4690 : ALLOCSET_DEFAULT_SIZES);
4691 :
4692 14194 : for_each_chunk(chunk, *events)
4693 : {
4694 : AfterTriggerEvent event;
4695 7736 : bool all_fired_in_chunk = true;
4696 :
4697 19616 : for_each_event(event, chunk)
4698 : {
4699 13158 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4700 :
4701 : /*
4702 : * Is it one for me to fire?
4703 : */
4704 13158 : if ((event->ate_flags & AFTER_TRIGGER_IN_PROGRESS) &&
4705 11688 : evtshared->ats_firing_id == firing_id)
4706 10410 : {
4707 : ResultRelInfo *src_rInfo,
4708 : *dst_rInfo;
4709 :
4710 : /*
4711 : * So let's fire it... but first, find the correct relation if
4712 : * this is not the same relation as before.
4713 : */
4714 11688 : if (rel == NULL || RelationGetRelid(rel) != evtshared->ats_relid)
4715 : {
4716 8038 : rInfo = ExecGetTriggerResultRel(estate, evtshared->ats_relid,
4717 : NULL);
4718 8038 : rel = rInfo->ri_RelationDesc;
4719 : /* Catch calls with insufficient relcache refcounting */
4720 : Assert(!RelationHasReferenceCountZero(rel));
4721 8038 : trigdesc = rInfo->ri_TrigDesc;
4722 : /* caution: trigdesc could be NULL here */
4723 8038 : finfo = rInfo->ri_TrigFunctions;
4724 8038 : instr = rInfo->ri_TrigInstrument;
4725 8038 : if (slot1 != NULL)
4726 : {
4727 0 : ExecDropSingleTupleTableSlot(slot1);
4728 0 : ExecDropSingleTupleTableSlot(slot2);
4729 0 : slot1 = slot2 = NULL;
4730 : }
4731 8038 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
4732 : {
4733 38 : slot1 = MakeSingleTupleTableSlot(rel->rd_att,
4734 : &TTSOpsMinimalTuple);
4735 38 : slot2 = MakeSingleTupleTableSlot(rel->rd_att,
4736 : &TTSOpsMinimalTuple);
4737 : }
4738 : }
4739 :
4740 : /*
4741 : * Look up source and destination partition result rels of a
4742 : * cross-partition update event.
4743 : */
4744 11688 : if ((event->ate_flags & AFTER_TRIGGER_TUP_BITS) ==
4745 : AFTER_TRIGGER_CP_UPDATE)
4746 : {
4747 : Assert(OidIsValid(event->ate_src_part) &&
4748 : OidIsValid(event->ate_dst_part));
4749 144 : src_rInfo = ExecGetTriggerResultRel(estate,
4750 : event->ate_src_part,
4751 : rInfo);
4752 144 : dst_rInfo = ExecGetTriggerResultRel(estate,
4753 : event->ate_dst_part,
4754 : rInfo);
4755 : }
4756 : else
4757 11544 : src_rInfo = dst_rInfo = rInfo;
4758 :
4759 : /*
4760 : * Fire it. Note that the AFTER_TRIGGER_IN_PROGRESS flag is
4761 : * still set, so recursive examinations of the event list
4762 : * won't try to re-fire it.
4763 : */
4764 11688 : AfterTriggerExecute(estate, event, rInfo,
4765 : src_rInfo, dst_rInfo,
4766 : trigdesc, finfo, instr,
4767 : per_tuple_context, slot1, slot2);
4768 :
4769 : /*
4770 : * Mark the event as done.
4771 : */
4772 10410 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
4773 10410 : event->ate_flags |= AFTER_TRIGGER_DONE;
4774 : }
4775 1470 : else if (!(event->ate_flags & AFTER_TRIGGER_DONE))
4776 : {
4777 : /* something remains to be done */
4778 510 : all_fired = all_fired_in_chunk = false;
4779 : }
4780 : }
4781 :
4782 : /* Clear the chunk if delete_ok and nothing left of interest */
4783 6458 : if (delete_ok && all_fired_in_chunk)
4784 : {
4785 192 : chunk->freeptr = CHUNK_DATA_START(chunk);
4786 192 : chunk->endfree = chunk->endptr;
4787 :
4788 : /*
4789 : * If it's last chunk, must sync event list's tailfree too. Note
4790 : * that delete_ok must NOT be passed as true if there could be
4791 : * additional AfterTriggerEventList values pointing at this event
4792 : * list, since we'd fail to fix their copies of tailfree.
4793 : */
4794 192 : if (chunk == events->tail)
4795 192 : events->tailfree = chunk->freeptr;
4796 : }
4797 : }
4798 6458 : if (slot1 != NULL)
4799 : {
4800 38 : ExecDropSingleTupleTableSlot(slot1);
4801 38 : ExecDropSingleTupleTableSlot(slot2);
4802 : }
4803 :
4804 : /* Release working resources */
4805 6458 : MemoryContextDelete(per_tuple_context);
4806 :
4807 6458 : if (local_estate)
4808 : {
4809 192 : ExecCloseResultRelations(estate);
4810 192 : ExecResetTupleTable(estate->es_tupleTable, false);
4811 192 : FreeExecutorState(estate);
4812 : }
4813 :
4814 6458 : return all_fired;
4815 : }
4816 :
4817 :
4818 : /*
4819 : * GetAfterTriggersTableData
4820 : *
4821 : * Find or create an AfterTriggersTableData struct for the specified
4822 : * trigger event (relation + operation type). Ignore existing structs
4823 : * marked "closed"; we don't want to put any additional tuples into them,
4824 : * nor change their stmt-triggers-fired state.
4825 : *
4826 : * Note: the AfterTriggersTableData list is allocated in the current
4827 : * (sub)transaction's CurTransactionContext. This is OK because
4828 : * we don't need it to live past AfterTriggerEndQuery.
4829 : */
4830 : static AfterTriggersTableData *
4831 2172 : GetAfterTriggersTableData(Oid relid, CmdType cmdType)
4832 : {
4833 : AfterTriggersTableData *table;
4834 : AfterTriggersQueryData *qs;
4835 : MemoryContext oldcxt;
4836 : ListCell *lc;
4837 :
4838 : /* Caller should have ensured query_depth is OK. */
4839 : Assert(afterTriggers.query_depth >= 0 &&
4840 : afterTriggers.query_depth < afterTriggers.maxquerydepth);
4841 2172 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
4842 :
4843 2520 : foreach(lc, qs->tables)
4844 : {
4845 1438 : table = (AfterTriggersTableData *) lfirst(lc);
4846 1438 : if (table->relid == relid && table->cmdType == cmdType &&
4847 1126 : !table->closed)
4848 1090 : return table;
4849 : }
4850 :
4851 1082 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4852 :
4853 1082 : table = (AfterTriggersTableData *) palloc0(sizeof(AfterTriggersTableData));
4854 1082 : table->relid = relid;
4855 1082 : table->cmdType = cmdType;
4856 1082 : qs->tables = lappend(qs->tables, table);
4857 :
4858 1082 : MemoryContextSwitchTo(oldcxt);
4859 :
4860 1082 : return table;
4861 : }
4862 :
4863 : /*
4864 : * Returns a TupleTableSlot suitable for holding the tuples to be put
4865 : * into AfterTriggersTableData's transition table tuplestores.
4866 : */
4867 : static TupleTableSlot *
4868 294 : GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
4869 : TupleDesc tupdesc)
4870 : {
4871 : /* Create it if not already done. */
4872 294 : if (!table->storeslot)
4873 : {
4874 : MemoryContext oldcxt;
4875 :
4876 : /*
4877 : * We need this slot only until AfterTriggerEndQuery, but making it
4878 : * last till end-of-subxact is good enough. It'll be freed by
4879 : * AfterTriggerFreeQuery(). However, the passed-in tupdesc might have
4880 : * a different lifespan, so we'd better make a copy of that.
4881 : */
4882 84 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4883 84 : tupdesc = CreateTupleDescCopy(tupdesc);
4884 84 : table->storeslot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
4885 84 : MemoryContextSwitchTo(oldcxt);
4886 : }
4887 :
4888 294 : return table->storeslot;
4889 : }
4890 :
4891 : /*
4892 : * MakeTransitionCaptureState
4893 : *
4894 : * Make a TransitionCaptureState object for the given TriggerDesc, target
4895 : * relation, and operation type. The TCS object holds all the state needed
4896 : * to decide whether to capture tuples in transition tables.
4897 : *
4898 : * If there are no triggers in 'trigdesc' that request relevant transition
4899 : * tables, then return NULL.
4900 : *
4901 : * The resulting object can be passed to the ExecAR* functions. When
4902 : * dealing with child tables, the caller can set tcs_original_insert_tuple
4903 : * to avoid having to reconstruct the original tuple in the root table's
4904 : * format.
4905 : *
4906 : * Note that we copy the flags from a parent table into this struct (rather
4907 : * than subsequently using the relation's TriggerDesc directly) so that we can
4908 : * use it to control collection of transition tuples from child tables.
4909 : *
4910 : * Per SQL spec, all operations of the same kind (INSERT/UPDATE/DELETE)
4911 : * on the same table during one query should share one transition table.
4912 : * Therefore, the Tuplestores are owned by an AfterTriggersTableData struct
4913 : * looked up using the table OID + CmdType, and are merely referenced by
4914 : * the TransitionCaptureState objects we hand out to callers.
4915 : */
4916 : TransitionCaptureState *
4917 122384 : MakeTransitionCaptureState(TriggerDesc *trigdesc, Oid relid, CmdType cmdType)
4918 : {
4919 : TransitionCaptureState *state;
4920 : bool need_old_upd,
4921 : need_new_upd,
4922 : need_old_del,
4923 : need_new_ins;
4924 : AfterTriggersTableData *table;
4925 : MemoryContext oldcxt;
4926 : ResourceOwner saveResourceOwner;
4927 :
4928 122384 : if (trigdesc == NULL)
4929 109312 : return NULL;
4930 :
4931 : /* Detect which table(s) we need. */
4932 13072 : switch (cmdType)
4933 : {
4934 7178 : case CMD_INSERT:
4935 7178 : need_old_upd = need_old_del = need_new_upd = false;
4936 7178 : need_new_ins = trigdesc->trig_insert_new_table;
4937 7178 : break;
4938 4018 : case CMD_UPDATE:
4939 4018 : need_old_upd = trigdesc->trig_update_old_table;
4940 4018 : need_new_upd = trigdesc->trig_update_new_table;
4941 4018 : need_old_del = need_new_ins = false;
4942 4018 : break;
4943 1554 : case CMD_DELETE:
4944 1554 : need_old_del = trigdesc->trig_delete_old_table;
4945 1554 : need_old_upd = need_new_upd = need_new_ins = false;
4946 1554 : break;
4947 322 : case CMD_MERGE:
4948 322 : need_old_upd = trigdesc->trig_update_old_table;
4949 322 : need_new_upd = trigdesc->trig_update_new_table;
4950 322 : need_old_del = trigdesc->trig_delete_old_table;
4951 322 : need_new_ins = trigdesc->trig_insert_new_table;
4952 322 : break;
4953 0 : default:
4954 0 : elog(ERROR, "unexpected CmdType: %d", (int) cmdType);
4955 : /* keep compiler quiet */
4956 : need_old_upd = need_new_upd = need_old_del = need_new_ins = false;
4957 : break;
4958 : }
4959 13072 : if (!need_old_upd && !need_new_upd && !need_new_ins && !need_old_del)
4960 12490 : return NULL;
4961 :
4962 : /* Check state, like AfterTriggerSaveEvent. */
4963 582 : if (afterTriggers.query_depth < 0)
4964 0 : elog(ERROR, "MakeTransitionCaptureState() called outside of query");
4965 :
4966 : /* Be sure we have enough space to record events at this query depth. */
4967 582 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
4968 438 : AfterTriggerEnlargeQueryState();
4969 :
4970 : /*
4971 : * Find or create an AfterTriggersTableData struct to hold the
4972 : * tuplestore(s). If there's a matching struct but it's marked closed,
4973 : * ignore it; we need a newer one.
4974 : *
4975 : * Note: the AfterTriggersTableData list, as well as the tuplestores, are
4976 : * allocated in the current (sub)transaction's CurTransactionContext, and
4977 : * the tuplestores are managed by the (sub)transaction's resource owner.
4978 : * This is sufficient lifespan because we do not allow triggers using
4979 : * transition tables to be deferrable; they will be fired during
4980 : * AfterTriggerEndQuery, after which it's okay to delete the data.
4981 : */
4982 582 : table = GetAfterTriggersTableData(relid, cmdType);
4983 :
4984 : /* Now create required tuplestore(s), if we don't have them already. */
4985 582 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4986 582 : saveResourceOwner = CurrentResourceOwner;
4987 582 : CurrentResourceOwner = CurTransactionResourceOwner;
4988 :
4989 582 : if (need_old_upd && table->old_upd_tuplestore == NULL)
4990 168 : table->old_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4991 582 : if (need_new_upd && table->new_upd_tuplestore == NULL)
4992 180 : table->new_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4993 582 : if (need_old_del && table->old_del_tuplestore == NULL)
4994 138 : table->old_del_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4995 582 : if (need_new_ins && table->new_ins_tuplestore == NULL)
4996 222 : table->new_ins_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4997 :
4998 582 : CurrentResourceOwner = saveResourceOwner;
4999 582 : MemoryContextSwitchTo(oldcxt);
5000 :
5001 : /* Now build the TransitionCaptureState struct, in caller's context */
5002 582 : state = (TransitionCaptureState *) palloc0(sizeof(TransitionCaptureState));
5003 582 : state->tcs_delete_old_table = need_old_del;
5004 582 : state->tcs_update_old_table = need_old_upd;
5005 582 : state->tcs_update_new_table = need_new_upd;
5006 582 : state->tcs_insert_new_table = need_new_ins;
5007 582 : state->tcs_private = table;
5008 :
5009 582 : return state;
5010 : }
5011 :
5012 :
5013 : /* ----------
5014 : * AfterTriggerBeginXact()
5015 : *
5016 : * Called at transaction start (either BEGIN or implicit for single
5017 : * statement outside of transaction block).
5018 : * ----------
5019 : */
5020 : void
5021 800550 : AfterTriggerBeginXact(void)
5022 : {
5023 : /*
5024 : * Initialize after-trigger state structure to empty
5025 : */
5026 800550 : afterTriggers.firing_counter = (CommandId) 1; /* mustn't be 0 */
5027 800550 : afterTriggers.query_depth = -1;
5028 :
5029 : /*
5030 : * Verify that there is no leftover state remaining. If these assertions
5031 : * trip, it means that AfterTriggerEndXact wasn't called or didn't clean
5032 : * up properly.
5033 : */
5034 : Assert(afterTriggers.state == NULL);
5035 : Assert(afterTriggers.query_stack == NULL);
5036 : Assert(afterTriggers.maxquerydepth == 0);
5037 : Assert(afterTriggers.event_cxt == NULL);
5038 : Assert(afterTriggers.events.head == NULL);
5039 : Assert(afterTriggers.trans_stack == NULL);
5040 : Assert(afterTriggers.maxtransdepth == 0);
5041 800550 : }
5042 :
5043 :
5044 : /* ----------
5045 : * AfterTriggerBeginQuery()
5046 : *
5047 : * Called just before we start processing a single query within a
5048 : * transaction (or subtransaction). Most of the real work gets deferred
5049 : * until somebody actually tries to queue a trigger event.
5050 : * ----------
5051 : */
5052 : void
5053 420822 : AfterTriggerBeginQuery(void)
5054 : {
5055 : /* Increase the query stack depth */
5056 420822 : afterTriggers.query_depth++;
5057 420822 : }
5058 :
5059 :
5060 : /* ----------
5061 : * AfterTriggerAbortQuery()
5062 : *
5063 : * Called by standard_ExecutorEnd() if the query execution was aborted due to
5064 : * the plan becoming invalid during initialization.
5065 : * ----------
5066 : */
5067 : void
5068 0 : AfterTriggerAbortQuery(void)
5069 : {
5070 : /* Revert the actions of AfterTriggerBeginQuery(). */
5071 0 : afterTriggers.query_depth--;
5072 0 : }
5073 :
5074 :
5075 : /* ----------
5076 : * AfterTriggerEndQuery()
5077 : *
5078 : * Called after one query has been completely processed. At this time
5079 : * we invoke all AFTER IMMEDIATE trigger events queued by the query, and
5080 : * transfer deferred trigger events to the global deferred-trigger list.
5081 : *
5082 : * Note that this must be called BEFORE closing down the executor
5083 : * with ExecutorEnd, because we make use of the EState's info about
5084 : * target relations. Normally it is called from ExecutorFinish.
5085 : * ----------
5086 : */
5087 : void
5088 416098 : AfterTriggerEndQuery(EState *estate)
5089 : {
5090 : AfterTriggersQueryData *qs;
5091 :
5092 : /* Must be inside a query, too */
5093 : Assert(afterTriggers.query_depth >= 0);
5094 :
5095 : /*
5096 : * If we never even got as far as initializing the event stack, there
5097 : * certainly won't be any events, so exit quickly.
5098 : */
5099 416098 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
5100 : {
5101 407132 : afterTriggers.query_depth--;
5102 407132 : return;
5103 : }
5104 :
5105 : /*
5106 : * Process all immediate-mode triggers queued by the query, and move the
5107 : * deferred ones to the main list of deferred events.
5108 : *
5109 : * Notice that we decide which ones will be fired, and put the deferred
5110 : * ones on the main list, before anything is actually fired. This ensures
5111 : * reasonably sane behavior if a trigger function does SET CONSTRAINTS ...
5112 : * IMMEDIATE: all events we have decided to defer will be available for it
5113 : * to fire.
5114 : *
5115 : * We loop in case a trigger queues more events at the same query level.
5116 : * Ordinary trigger functions, including all PL/pgSQL trigger functions,
5117 : * will instead fire any triggers in a dedicated query level. Foreign key
5118 : * enforcement triggers do add to the current query level, thanks to their
5119 : * passing fire_triggers = false to SPI_execute_snapshot(). Other
5120 : * C-language triggers might do likewise.
5121 : *
5122 : * If we find no firable events, we don't have to increment
5123 : * firing_counter.
5124 : */
5125 8966 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5126 :
5127 : for (;;)
5128 : {
5129 9266 : if (afterTriggerMarkEvents(&qs->events, &afterTriggers.events, true))
5130 : {
5131 7374 : CommandId firing_id = afterTriggers.firing_counter++;
5132 7374 : AfterTriggerEventChunk *oldtail = qs->events.tail;
5133 :
5134 7374 : if (afterTriggerInvokeEvents(&qs->events, firing_id, estate, false))
5135 5966 : break; /* all fired */
5136 :
5137 : /*
5138 : * Firing a trigger could result in query_stack being repalloc'd,
5139 : * so we must recalculate qs after each afterTriggerInvokeEvents
5140 : * call. Furthermore, it's unsafe to pass delete_ok = true here,
5141 : * because that could cause afterTriggerInvokeEvents to try to
5142 : * access qs->events after the stack has been repalloc'd.
5143 : */
5144 300 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5145 :
5146 : /*
5147 : * We'll need to scan the events list again. To reduce the cost
5148 : * of doing so, get rid of completely-fired chunks. We know that
5149 : * all events were marked IN_PROGRESS or DONE at the conclusion of
5150 : * afterTriggerMarkEvents, so any still-interesting events must
5151 : * have been added after that, and so must be in the chunk that
5152 : * was then the tail chunk, or in later chunks. So, zap all
5153 : * chunks before oldtail. This is approximately the same set of
5154 : * events we would have gotten rid of by passing delete_ok = true.
5155 : */
5156 : Assert(oldtail != NULL);
5157 300 : while (qs->events.head != oldtail)
5158 0 : afterTriggerDeleteHeadEventChunk(qs);
5159 : }
5160 : else
5161 1880 : break;
5162 : }
5163 :
5164 : /* Release query-level-local storage, including tuplestores if any */
5165 7846 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5166 :
5167 7846 : afterTriggers.query_depth--;
5168 : }
5169 :
5170 :
5171 : /*
5172 : * AfterTriggerFreeQuery
5173 : * Release subsidiary storage for a trigger query level.
5174 : * This includes closing down tuplestores.
5175 : * Note: it's important for this to be safe if interrupted by an error
5176 : * and then called again for the same query level.
5177 : */
5178 : static void
5179 7876 : AfterTriggerFreeQuery(AfterTriggersQueryData *qs)
5180 : {
5181 : Tuplestorestate *ts;
5182 : List *tables;
5183 : ListCell *lc;
5184 :
5185 : /* Drop the trigger events */
5186 7876 : afterTriggerFreeEventList(&qs->events);
5187 :
5188 : /* Drop FDW tuplestore if any */
5189 7876 : ts = qs->fdw_tuplestore;
5190 7876 : qs->fdw_tuplestore = NULL;
5191 7876 : if (ts)
5192 36 : tuplestore_end(ts);
5193 :
5194 : /* Release per-table subsidiary storage */
5195 7876 : tables = qs->tables;
5196 8900 : foreach(lc, tables)
5197 : {
5198 1024 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
5199 :
5200 1024 : ts = table->old_upd_tuplestore;
5201 1024 : table->old_upd_tuplestore = NULL;
5202 1024 : if (ts)
5203 156 : tuplestore_end(ts);
5204 1024 : ts = table->new_upd_tuplestore;
5205 1024 : table->new_upd_tuplestore = NULL;
5206 1024 : if (ts)
5207 162 : tuplestore_end(ts);
5208 1024 : ts = table->old_del_tuplestore;
5209 1024 : table->old_del_tuplestore = NULL;
5210 1024 : if (ts)
5211 126 : tuplestore_end(ts);
5212 1024 : ts = table->new_ins_tuplestore;
5213 1024 : table->new_ins_tuplestore = NULL;
5214 1024 : if (ts)
5215 210 : tuplestore_end(ts);
5216 1024 : if (table->storeslot)
5217 : {
5218 84 : TupleTableSlot *slot = table->storeslot;
5219 :
5220 84 : table->storeslot = NULL;
5221 84 : ExecDropSingleTupleTableSlot(slot);
5222 : }
5223 : }
5224 :
5225 : /*
5226 : * Now free the AfterTriggersTableData structs and list cells. Reset list
5227 : * pointer first; if list_free_deep somehow gets an error, better to leak
5228 : * that storage than have an infinite loop.
5229 : */
5230 7876 : qs->tables = NIL;
5231 7876 : list_free_deep(tables);
5232 7876 : }
5233 :
5234 :
5235 : /* ----------
5236 : * AfterTriggerFireDeferred()
5237 : *
5238 : * Called just before the current transaction is committed. At this
5239 : * time we invoke all pending DEFERRED triggers.
5240 : *
5241 : * It is possible for other modules to queue additional deferred triggers
5242 : * during pre-commit processing; therefore xact.c may have to call this
5243 : * multiple times.
5244 : * ----------
5245 : */
5246 : void
5247 764384 : AfterTriggerFireDeferred(void)
5248 : {
5249 : AfterTriggerEventList *events;
5250 764384 : bool snap_pushed = false;
5251 :
5252 : /* Must not be inside a query */
5253 : Assert(afterTriggers.query_depth == -1);
5254 :
5255 : /*
5256 : * If there are any triggers to fire, make sure we have set a snapshot for
5257 : * them to use. (Since PortalRunUtility doesn't set a snap for COMMIT, we
5258 : * can't assume ActiveSnapshot is valid on entry.)
5259 : */
5260 764384 : events = &afterTriggers.events;
5261 764384 : if (events->head != NULL)
5262 : {
5263 346 : PushActiveSnapshot(GetTransactionSnapshot());
5264 346 : snap_pushed = true;
5265 : }
5266 :
5267 : /*
5268 : * Run all the remaining triggers. Loop until they are all gone, in case
5269 : * some trigger queues more for us to do.
5270 : */
5271 764384 : while (afterTriggerMarkEvents(events, NULL, false))
5272 : {
5273 346 : CommandId firing_id = afterTriggers.firing_counter++;
5274 :
5275 346 : if (afterTriggerInvokeEvents(events, firing_id, NULL, true))
5276 192 : break; /* all fired */
5277 : }
5278 :
5279 : /*
5280 : * We don't bother freeing the event list, since it will go away anyway
5281 : * (and more efficiently than via pfree) in AfterTriggerEndXact.
5282 : */
5283 :
5284 764230 : if (snap_pushed)
5285 192 : PopActiveSnapshot();
5286 764230 : }
5287 :
5288 :
5289 : /* ----------
5290 : * AfterTriggerEndXact()
5291 : *
5292 : * The current transaction is finishing.
5293 : *
5294 : * Any unfired triggers are canceled so we simply throw
5295 : * away anything we know.
5296 : *
5297 : * Note: it is possible for this to be called repeatedly in case of
5298 : * error during transaction abort; therefore, do not complain if
5299 : * already closed down.
5300 : * ----------
5301 : */
5302 : void
5303 800962 : AfterTriggerEndXact(bool isCommit)
5304 : {
5305 : /*
5306 : * Forget the pending-events list.
5307 : *
5308 : * Since all the info is in TopTransactionContext or children thereof, we
5309 : * don't really need to do anything to reclaim memory. However, the
5310 : * pending-events list could be large, and so it's useful to discard it as
5311 : * soon as possible --- especially if we are aborting because we ran out
5312 : * of memory for the list!
5313 : */
5314 800962 : if (afterTriggers.event_cxt)
5315 : {
5316 6752 : MemoryContextDelete(afterTriggers.event_cxt);
5317 6752 : afterTriggers.event_cxt = NULL;
5318 6752 : afterTriggers.events.head = NULL;
5319 6752 : afterTriggers.events.tail = NULL;
5320 6752 : afterTriggers.events.tailfree = NULL;
5321 : }
5322 :
5323 : /*
5324 : * Forget any subtransaction state as well. Since this can't be very
5325 : * large, we let the eventual reset of TopTransactionContext free the
5326 : * memory instead of doing it here.
5327 : */
5328 800962 : afterTriggers.trans_stack = NULL;
5329 800962 : afterTriggers.maxtransdepth = 0;
5330 :
5331 :
5332 : /*
5333 : * Forget the query stack and constraint-related state information. As
5334 : * with the subtransaction state information, we don't bother freeing the
5335 : * memory here.
5336 : */
5337 800962 : afterTriggers.query_stack = NULL;
5338 800962 : afterTriggers.maxquerydepth = 0;
5339 800962 : afterTriggers.state = NULL;
5340 :
5341 : /* No more afterTriggers manipulation until next transaction starts. */
5342 800962 : afterTriggers.query_depth = -1;
5343 800962 : }
5344 :
5345 : /*
5346 : * AfterTriggerBeginSubXact()
5347 : *
5348 : * Start a subtransaction.
5349 : */
5350 : void
5351 20000 : AfterTriggerBeginSubXact(void)
5352 : {
5353 20000 : int my_level = GetCurrentTransactionNestLevel();
5354 :
5355 : /*
5356 : * Allocate more space in the trans_stack if needed. (Note: because the
5357 : * minimum nest level of a subtransaction is 2, we waste the first couple
5358 : * entries of the array; not worth the notational effort to avoid it.)
5359 : */
5360 22790 : while (my_level >= afterTriggers.maxtransdepth)
5361 : {
5362 2790 : if (afterTriggers.maxtransdepth == 0)
5363 : {
5364 : /* Arbitrarily initialize for max of 8 subtransaction levels */
5365 2706 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5366 2706 : MemoryContextAlloc(TopTransactionContext,
5367 : 8 * sizeof(AfterTriggersTransData));
5368 2706 : afterTriggers.maxtransdepth = 8;
5369 : }
5370 : else
5371 : {
5372 : /* repalloc will keep the stack in the same context */
5373 84 : int new_alloc = afterTriggers.maxtransdepth * 2;
5374 :
5375 84 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5376 84 : repalloc(afterTriggers.trans_stack,
5377 : new_alloc * sizeof(AfterTriggersTransData));
5378 84 : afterTriggers.maxtransdepth = new_alloc;
5379 : }
5380 : }
5381 :
5382 : /*
5383 : * Push the current information into the stack. The SET CONSTRAINTS state
5384 : * is not saved until/unless changed. Likewise, we don't make a
5385 : * per-subtransaction event context until needed.
5386 : */
5387 20000 : afterTriggers.trans_stack[my_level].state = NULL;
5388 20000 : afterTriggers.trans_stack[my_level].events = afterTriggers.events;
5389 20000 : afterTriggers.trans_stack[my_level].query_depth = afterTriggers.query_depth;
5390 20000 : afterTriggers.trans_stack[my_level].firing_counter = afterTriggers.firing_counter;
5391 20000 : }
5392 :
5393 : /*
5394 : * AfterTriggerEndSubXact()
5395 : *
5396 : * The current subtransaction is ending.
5397 : */
5398 : void
5399 20000 : AfterTriggerEndSubXact(bool isCommit)
5400 : {
5401 20000 : int my_level = GetCurrentTransactionNestLevel();
5402 : SetConstraintState state;
5403 : AfterTriggerEvent event;
5404 : AfterTriggerEventChunk *chunk;
5405 : CommandId subxact_firing_id;
5406 :
5407 : /*
5408 : * Pop the prior state if needed.
5409 : */
5410 20000 : if (isCommit)
5411 : {
5412 : Assert(my_level < afterTriggers.maxtransdepth);
5413 : /* If we saved a prior state, we don't need it anymore */
5414 10724 : state = afterTriggers.trans_stack[my_level].state;
5415 10724 : if (state != NULL)
5416 6 : pfree(state);
5417 : /* this avoids double pfree if error later: */
5418 10724 : afterTriggers.trans_stack[my_level].state = NULL;
5419 : Assert(afterTriggers.query_depth ==
5420 : afterTriggers.trans_stack[my_level].query_depth);
5421 : }
5422 : else
5423 : {
5424 : /*
5425 : * Aborting. It is possible subxact start failed before calling
5426 : * AfterTriggerBeginSubXact, in which case we mustn't risk touching
5427 : * trans_stack levels that aren't there.
5428 : */
5429 9276 : if (my_level >= afterTriggers.maxtransdepth)
5430 0 : return;
5431 :
5432 : /*
5433 : * Release query-level storage for queries being aborted, and restore
5434 : * query_depth to its pre-subxact value. This assumes that a
5435 : * subtransaction will not add events to query levels started in a
5436 : * earlier transaction state.
5437 : */
5438 9370 : while (afterTriggers.query_depth > afterTriggers.trans_stack[my_level].query_depth)
5439 : {
5440 94 : if (afterTriggers.query_depth < afterTriggers.maxquerydepth)
5441 30 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5442 94 : afterTriggers.query_depth--;
5443 : }
5444 : Assert(afterTriggers.query_depth ==
5445 : afterTriggers.trans_stack[my_level].query_depth);
5446 :
5447 : /*
5448 : * Restore the global deferred-event list to its former length,
5449 : * discarding any events queued by the subxact.
5450 : */
5451 9276 : afterTriggerRestoreEventList(&afterTriggers.events,
5452 9276 : &afterTriggers.trans_stack[my_level].events);
5453 :
5454 : /*
5455 : * Restore the trigger state. If the saved state is NULL, then this
5456 : * subxact didn't save it, so it doesn't need restoring.
5457 : */
5458 9276 : state = afterTriggers.trans_stack[my_level].state;
5459 9276 : if (state != NULL)
5460 : {
5461 4 : pfree(afterTriggers.state);
5462 4 : afterTriggers.state = state;
5463 : }
5464 : /* this avoids double pfree if error later: */
5465 9276 : afterTriggers.trans_stack[my_level].state = NULL;
5466 :
5467 : /*
5468 : * Scan for any remaining deferred events that were marked DONE or IN
5469 : * PROGRESS by this subxact or a child, and un-mark them. We can
5470 : * recognize such events because they have a firing ID greater than or
5471 : * equal to the firing_counter value we saved at subtransaction start.
5472 : * (This essentially assumes that the current subxact includes all
5473 : * subxacts started after it.)
5474 : */
5475 9276 : subxact_firing_id = afterTriggers.trans_stack[my_level].firing_counter;
5476 9320 : for_each_event_chunk(event, chunk, afterTriggers.events)
5477 : {
5478 22 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
5479 :
5480 22 : if (event->ate_flags &
5481 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS))
5482 : {
5483 4 : if (evtshared->ats_firing_id >= subxact_firing_id)
5484 4 : event->ate_flags &=
5485 : ~(AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS);
5486 : }
5487 : }
5488 : }
5489 : }
5490 :
5491 : /*
5492 : * Get the transition table for the given event and depending on whether we are
5493 : * processing the old or the new tuple.
5494 : */
5495 : static Tuplestorestate *
5496 66126 : GetAfterTriggersTransitionTable(int event,
5497 : TupleTableSlot *oldslot,
5498 : TupleTableSlot *newslot,
5499 : TransitionCaptureState *transition_capture)
5500 : {
5501 66126 : Tuplestorestate *tuplestore = NULL;
5502 66126 : bool delete_old_table = transition_capture->tcs_delete_old_table;
5503 66126 : bool update_old_table = transition_capture->tcs_update_old_table;
5504 66126 : bool update_new_table = transition_capture->tcs_update_new_table;
5505 66126 : bool insert_new_table = transition_capture->tcs_insert_new_table;
5506 :
5507 : /*
5508 : * For INSERT events NEW should be non-NULL, for DELETE events OLD should
5509 : * be non-NULL, whereas for UPDATE events normally both OLD and NEW are
5510 : * non-NULL. But for UPDATE events fired for capturing transition tuples
5511 : * during UPDATE partition-key row movement, OLD is NULL when the event is
5512 : * for a row being inserted, whereas NEW is NULL when the event is for a
5513 : * row being deleted.
5514 : */
5515 : Assert(!(event == TRIGGER_EVENT_DELETE && delete_old_table &&
5516 : TupIsNull(oldslot)));
5517 : Assert(!(event == TRIGGER_EVENT_INSERT && insert_new_table &&
5518 : TupIsNull(newslot)));
5519 :
5520 66126 : if (!TupIsNull(oldslot))
5521 : {
5522 : Assert(TupIsNull(newslot));
5523 5412 : if (event == TRIGGER_EVENT_DELETE && delete_old_table)
5524 5052 : tuplestore = transition_capture->tcs_private->old_del_tuplestore;
5525 360 : else if (event == TRIGGER_EVENT_UPDATE && update_old_table)
5526 336 : tuplestore = transition_capture->tcs_private->old_upd_tuplestore;
5527 : }
5528 60714 : else if (!TupIsNull(newslot))
5529 : {
5530 : Assert(TupIsNull(oldslot));
5531 60714 : if (event == TRIGGER_EVENT_INSERT && insert_new_table)
5532 60354 : tuplestore = transition_capture->tcs_private->new_ins_tuplestore;
5533 360 : else if (event == TRIGGER_EVENT_UPDATE && update_new_table)
5534 354 : tuplestore = transition_capture->tcs_private->new_upd_tuplestore;
5535 : }
5536 :
5537 66126 : return tuplestore;
5538 : }
5539 :
5540 : /*
5541 : * Add the given heap tuple to the given tuplestore, applying the conversion
5542 : * map if necessary.
5543 : *
5544 : * If original_insert_tuple is given, we can add that tuple without conversion.
5545 : */
5546 : static void
5547 66126 : TransitionTableAddTuple(EState *estate,
5548 : TransitionCaptureState *transition_capture,
5549 : ResultRelInfo *relinfo,
5550 : TupleTableSlot *slot,
5551 : TupleTableSlot *original_insert_tuple,
5552 : Tuplestorestate *tuplestore)
5553 : {
5554 : TupleConversionMap *map;
5555 :
5556 : /*
5557 : * Nothing needs to be done if we don't have a tuplestore.
5558 : */
5559 66126 : if (tuplestore == NULL)
5560 30 : return;
5561 :
5562 66096 : if (original_insert_tuple)
5563 144 : tuplestore_puttupleslot(tuplestore, original_insert_tuple);
5564 65952 : else if ((map = ExecGetChildToRootMap(relinfo)) != NULL)
5565 : {
5566 294 : AfterTriggersTableData *table = transition_capture->tcs_private;
5567 : TupleTableSlot *storeslot;
5568 :
5569 294 : storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
5570 294 : execute_attr_map_slot(map->attrMap, slot, storeslot);
5571 294 : tuplestore_puttupleslot(tuplestore, storeslot);
5572 : }
5573 : else
5574 65658 : tuplestore_puttupleslot(tuplestore, slot);
5575 : }
5576 :
5577 : /* ----------
5578 : * AfterTriggerEnlargeQueryState()
5579 : *
5580 : * Prepare the necessary state so that we can record AFTER trigger events
5581 : * queued by a query. It is allowed to have nested queries within a
5582 : * (sub)transaction, so we need to have separate state for each query
5583 : * nesting level.
5584 : * ----------
5585 : */
5586 : static void
5587 7106 : AfterTriggerEnlargeQueryState(void)
5588 : {
5589 7106 : int init_depth = afterTriggers.maxquerydepth;
5590 :
5591 : Assert(afterTriggers.query_depth >= afterTriggers.maxquerydepth);
5592 :
5593 7106 : if (afterTriggers.maxquerydepth == 0)
5594 : {
5595 7106 : int new_alloc = Max(afterTriggers.query_depth + 1, 8);
5596 :
5597 7106 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5598 7106 : MemoryContextAlloc(TopTransactionContext,
5599 : new_alloc * sizeof(AfterTriggersQueryData));
5600 7106 : afterTriggers.maxquerydepth = new_alloc;
5601 : }
5602 : else
5603 : {
5604 : /* repalloc will keep the stack in the same context */
5605 0 : int old_alloc = afterTriggers.maxquerydepth;
5606 0 : int new_alloc = Max(afterTriggers.query_depth + 1,
5607 : old_alloc * 2);
5608 :
5609 0 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5610 0 : repalloc(afterTriggers.query_stack,
5611 : new_alloc * sizeof(AfterTriggersQueryData));
5612 0 : afterTriggers.maxquerydepth = new_alloc;
5613 : }
5614 :
5615 : /* Initialize new array entries to empty */
5616 63954 : while (init_depth < afterTriggers.maxquerydepth)
5617 : {
5618 56848 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[init_depth];
5619 :
5620 56848 : qs->events.head = NULL;
5621 56848 : qs->events.tail = NULL;
5622 56848 : qs->events.tailfree = NULL;
5623 56848 : qs->fdw_tuplestore = NULL;
5624 56848 : qs->tables = NIL;
5625 :
5626 56848 : ++init_depth;
5627 : }
5628 7106 : }
5629 :
5630 : /*
5631 : * Create an empty SetConstraintState with room for numalloc trigstates
5632 : */
5633 : static SetConstraintState
5634 96 : SetConstraintStateCreate(int numalloc)
5635 : {
5636 : SetConstraintState state;
5637 :
5638 : /* Behave sanely with numalloc == 0 */
5639 96 : if (numalloc <= 0)
5640 10 : numalloc = 1;
5641 :
5642 : /*
5643 : * We assume that zeroing will correctly initialize the state values.
5644 : */
5645 : state = (SetConstraintState)
5646 96 : MemoryContextAllocZero(TopTransactionContext,
5647 : offsetof(SetConstraintStateData, trigstates) +
5648 96 : numalloc * sizeof(SetConstraintTriggerData));
5649 :
5650 96 : state->numalloc = numalloc;
5651 :
5652 96 : return state;
5653 : }
5654 :
5655 : /*
5656 : * Copy a SetConstraintState
5657 : */
5658 : static SetConstraintState
5659 10 : SetConstraintStateCopy(SetConstraintState origstate)
5660 : {
5661 : SetConstraintState state;
5662 :
5663 10 : state = SetConstraintStateCreate(origstate->numstates);
5664 :
5665 10 : state->all_isset = origstate->all_isset;
5666 10 : state->all_isdeferred = origstate->all_isdeferred;
5667 10 : state->numstates = origstate->numstates;
5668 10 : memcpy(state->trigstates, origstate->trigstates,
5669 10 : origstate->numstates * sizeof(SetConstraintTriggerData));
5670 :
5671 10 : return state;
5672 : }
5673 :
5674 : /*
5675 : * Add a per-trigger item to a SetConstraintState. Returns possibly-changed
5676 : * pointer to the state object (it will change if we have to repalloc).
5677 : */
5678 : static SetConstraintState
5679 342 : SetConstraintStateAddItem(SetConstraintState state,
5680 : Oid tgoid, bool tgisdeferred)
5681 : {
5682 342 : if (state->numstates >= state->numalloc)
5683 : {
5684 30 : int newalloc = state->numalloc * 2;
5685 :
5686 30 : newalloc = Max(newalloc, 8); /* in case original has size 0 */
5687 : state = (SetConstraintState)
5688 30 : repalloc(state,
5689 : offsetof(SetConstraintStateData, trigstates) +
5690 30 : newalloc * sizeof(SetConstraintTriggerData));
5691 30 : state->numalloc = newalloc;
5692 : Assert(state->numstates < state->numalloc);
5693 : }
5694 :
5695 342 : state->trigstates[state->numstates].sct_tgoid = tgoid;
5696 342 : state->trigstates[state->numstates].sct_tgisdeferred = tgisdeferred;
5697 342 : state->numstates++;
5698 :
5699 342 : return state;
5700 : }
5701 :
5702 : /* ----------
5703 : * AfterTriggerSetState()
5704 : *
5705 : * Execute the SET CONSTRAINTS ... utility command.
5706 : * ----------
5707 : */
5708 : void
5709 102 : AfterTriggerSetState(ConstraintsSetStmt *stmt)
5710 : {
5711 102 : int my_level = GetCurrentTransactionNestLevel();
5712 :
5713 : /* If we haven't already done so, initialize our state. */
5714 102 : if (afterTriggers.state == NULL)
5715 86 : afterTriggers.state = SetConstraintStateCreate(8);
5716 :
5717 : /*
5718 : * If in a subtransaction, and we didn't save the current state already,
5719 : * save it so it can be restored if the subtransaction aborts.
5720 : */
5721 102 : if (my_level > 1 &&
5722 10 : afterTriggers.trans_stack[my_level].state == NULL)
5723 : {
5724 10 : afterTriggers.trans_stack[my_level].state =
5725 10 : SetConstraintStateCopy(afterTriggers.state);
5726 : }
5727 :
5728 : /*
5729 : * Handle SET CONSTRAINTS ALL ...
5730 : */
5731 102 : if (stmt->constraints == NIL)
5732 : {
5733 : /*
5734 : * Forget any previous SET CONSTRAINTS commands in this transaction.
5735 : */
5736 54 : afterTriggers.state->numstates = 0;
5737 :
5738 : /*
5739 : * Set the per-transaction ALL state to known.
5740 : */
5741 54 : afterTriggers.state->all_isset = true;
5742 54 : afterTriggers.state->all_isdeferred = stmt->deferred;
5743 : }
5744 : else
5745 : {
5746 : Relation conrel;
5747 : Relation tgrel;
5748 48 : List *conoidlist = NIL;
5749 48 : List *tgoidlist = NIL;
5750 : ListCell *lc;
5751 :
5752 : /*
5753 : * Handle SET CONSTRAINTS constraint-name [, ...]
5754 : *
5755 : * First, identify all the named constraints and make a list of their
5756 : * OIDs. Since, unlike the SQL spec, we allow multiple constraints of
5757 : * the same name within a schema, the specifications are not
5758 : * necessarily unique. Our strategy is to target all matching
5759 : * constraints within the first search-path schema that has any
5760 : * matches, but disregard matches in schemas beyond the first match.
5761 : * (This is a bit odd but it's the historical behavior.)
5762 : *
5763 : * A constraint in a partitioned table may have corresponding
5764 : * constraints in the partitions. Grab those too.
5765 : */
5766 48 : conrel = table_open(ConstraintRelationId, AccessShareLock);
5767 :
5768 96 : foreach(lc, stmt->constraints)
5769 : {
5770 48 : RangeVar *constraint = lfirst(lc);
5771 : bool found;
5772 : List *namespacelist;
5773 : ListCell *nslc;
5774 :
5775 48 : if (constraint->catalogname)
5776 : {
5777 0 : if (strcmp(constraint->catalogname, get_database_name(MyDatabaseId)) != 0)
5778 0 : ereport(ERROR,
5779 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5780 : errmsg("cross-database references are not implemented: \"%s.%s.%s\"",
5781 : constraint->catalogname, constraint->schemaname,
5782 : constraint->relname)));
5783 : }
5784 :
5785 : /*
5786 : * If we're given the schema name with the constraint, look only
5787 : * in that schema. If given a bare constraint name, use the
5788 : * search path to find the first matching constraint.
5789 : */
5790 48 : if (constraint->schemaname)
5791 : {
5792 12 : Oid namespaceId = LookupExplicitNamespace(constraint->schemaname,
5793 : false);
5794 :
5795 12 : namespacelist = list_make1_oid(namespaceId);
5796 : }
5797 : else
5798 : {
5799 36 : namespacelist = fetch_search_path(true);
5800 : }
5801 :
5802 48 : found = false;
5803 120 : foreach(nslc, namespacelist)
5804 : {
5805 120 : Oid namespaceId = lfirst_oid(nslc);
5806 : SysScanDesc conscan;
5807 : ScanKeyData skey[2];
5808 : HeapTuple tup;
5809 :
5810 120 : ScanKeyInit(&skey[0],
5811 : Anum_pg_constraint_conname,
5812 : BTEqualStrategyNumber, F_NAMEEQ,
5813 120 : CStringGetDatum(constraint->relname));
5814 120 : ScanKeyInit(&skey[1],
5815 : Anum_pg_constraint_connamespace,
5816 : BTEqualStrategyNumber, F_OIDEQ,
5817 : ObjectIdGetDatum(namespaceId));
5818 :
5819 120 : conscan = systable_beginscan(conrel, ConstraintNameNspIndexId,
5820 : true, NULL, 2, skey);
5821 :
5822 216 : while (HeapTupleIsValid(tup = systable_getnext(conscan)))
5823 : {
5824 96 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);
5825 :
5826 96 : if (con->condeferrable)
5827 96 : conoidlist = lappend_oid(conoidlist, con->oid);
5828 0 : else if (stmt->deferred)
5829 0 : ereport(ERROR,
5830 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
5831 : errmsg("constraint \"%s\" is not deferrable",
5832 : constraint->relname)));
5833 96 : found = true;
5834 : }
5835 :
5836 120 : systable_endscan(conscan);
5837 :
5838 : /*
5839 : * Once we've found a matching constraint we do not search
5840 : * later parts of the search path.
5841 : */
5842 120 : if (found)
5843 48 : break;
5844 : }
5845 :
5846 48 : list_free(namespacelist);
5847 :
5848 : /*
5849 : * Not found ?
5850 : */
5851 48 : if (!found)
5852 0 : ereport(ERROR,
5853 : (errcode(ERRCODE_UNDEFINED_OBJECT),
5854 : errmsg("constraint \"%s\" does not exist",
5855 : constraint->relname)));
5856 : }
5857 :
5858 : /*
5859 : * Scan for any possible descendants of the constraints. We append
5860 : * whatever we find to the same list that we're scanning; this has the
5861 : * effect that we create new scans for those, too, so if there are
5862 : * further descendents, we'll also catch them.
5863 : */
5864 258 : foreach(lc, conoidlist)
5865 : {
5866 210 : Oid parent = lfirst_oid(lc);
5867 : ScanKeyData key;
5868 : SysScanDesc scan;
5869 : HeapTuple tuple;
5870 :
5871 210 : ScanKeyInit(&key,
5872 : Anum_pg_constraint_conparentid,
5873 : BTEqualStrategyNumber, F_OIDEQ,
5874 : ObjectIdGetDatum(parent));
5875 :
5876 210 : scan = systable_beginscan(conrel, ConstraintParentIndexId, true, NULL, 1, &key);
5877 :
5878 324 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
5879 : {
5880 114 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
5881 :
5882 114 : conoidlist = lappend_oid(conoidlist, con->oid);
5883 : }
5884 :
5885 210 : systable_endscan(scan);
5886 : }
5887 :
5888 48 : table_close(conrel, AccessShareLock);
5889 :
5890 : /*
5891 : * Now, locate the trigger(s) implementing each of these constraints,
5892 : * and make a list of their OIDs.
5893 : */
5894 48 : tgrel = table_open(TriggerRelationId, AccessShareLock);
5895 :
5896 258 : foreach(lc, conoidlist)
5897 : {
5898 210 : Oid conoid = lfirst_oid(lc);
5899 : ScanKeyData skey;
5900 : SysScanDesc tgscan;
5901 : HeapTuple htup;
5902 :
5903 210 : ScanKeyInit(&skey,
5904 : Anum_pg_trigger_tgconstraint,
5905 : BTEqualStrategyNumber, F_OIDEQ,
5906 : ObjectIdGetDatum(conoid));
5907 :
5908 210 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
5909 : NULL, 1, &skey);
5910 :
5911 648 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
5912 : {
5913 438 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
5914 :
5915 : /*
5916 : * Silently skip triggers that are marked as non-deferrable in
5917 : * pg_trigger. This is not an error condition, since a
5918 : * deferrable RI constraint may have some non-deferrable
5919 : * actions.
5920 : */
5921 438 : if (pg_trigger->tgdeferrable)
5922 438 : tgoidlist = lappend_oid(tgoidlist, pg_trigger->oid);
5923 : }
5924 :
5925 210 : systable_endscan(tgscan);
5926 : }
5927 :
5928 48 : table_close(tgrel, AccessShareLock);
5929 :
5930 : /*
5931 : * Now we can set the trigger states of individual triggers for this
5932 : * xact.
5933 : */
5934 486 : foreach(lc, tgoidlist)
5935 : {
5936 438 : Oid tgoid = lfirst_oid(lc);
5937 438 : SetConstraintState state = afterTriggers.state;
5938 438 : bool found = false;
5939 : int i;
5940 :
5941 2448 : for (i = 0; i < state->numstates; i++)
5942 : {
5943 2106 : if (state->trigstates[i].sct_tgoid == tgoid)
5944 : {
5945 96 : state->trigstates[i].sct_tgisdeferred = stmt->deferred;
5946 96 : found = true;
5947 96 : break;
5948 : }
5949 : }
5950 438 : if (!found)
5951 : {
5952 342 : afterTriggers.state =
5953 342 : SetConstraintStateAddItem(state, tgoid, stmt->deferred);
5954 : }
5955 : }
5956 : }
5957 :
5958 : /*
5959 : * SQL99 requires that when a constraint is set to IMMEDIATE, any deferred
5960 : * checks against that constraint must be made when the SET CONSTRAINTS
5961 : * command is executed -- i.e. the effects of the SET CONSTRAINTS command
5962 : * apply retroactively. We've updated the constraints state, so scan the
5963 : * list of previously deferred events to fire any that have now become
5964 : * immediate.
5965 : *
5966 : * Obviously, if this was SET ... DEFERRED then it can't have converted
5967 : * any unfired events to immediate, so we need do nothing in that case.
5968 : */
5969 102 : if (!stmt->deferred)
5970 : {
5971 34 : AfterTriggerEventList *events = &afterTriggers.events;
5972 34 : bool snapshot_set = false;
5973 :
5974 34 : while (afterTriggerMarkEvents(events, NULL, true))
5975 : {
5976 16 : CommandId firing_id = afterTriggers.firing_counter++;
5977 :
5978 : /*
5979 : * Make sure a snapshot has been established in case trigger
5980 : * functions need one. Note that we avoid setting a snapshot if
5981 : * we don't find at least one trigger that has to be fired now.
5982 : * This is so that BEGIN; SET CONSTRAINTS ...; SET TRANSACTION
5983 : * ISOLATION LEVEL SERIALIZABLE; ... works properly. (If we are
5984 : * at the start of a transaction it's not possible for any trigger
5985 : * events to be queued yet.)
5986 : */
5987 16 : if (!snapshot_set)
5988 : {
5989 16 : PushActiveSnapshot(GetTransactionSnapshot());
5990 16 : snapshot_set = true;
5991 : }
5992 :
5993 : /*
5994 : * We can delete fired events if we are at top transaction level,
5995 : * but we'd better not if inside a subtransaction, since the
5996 : * subtransaction could later get rolled back.
5997 : */
5998 0 : if (afterTriggerInvokeEvents(events, firing_id, NULL,
5999 16 : !IsSubTransaction()))
6000 0 : break; /* all fired */
6001 : }
6002 :
6003 18 : if (snapshot_set)
6004 0 : PopActiveSnapshot();
6005 : }
6006 86 : }
6007 :
6008 : /* ----------
6009 : * AfterTriggerPendingOnRel()
6010 : * Test to see if there are any pending after-trigger events for rel.
6011 : *
6012 : * This is used by TRUNCATE, CLUSTER, ALTER TABLE, etc to detect whether
6013 : * it is unsafe to perform major surgery on a relation. Note that only
6014 : * local pending events are examined. We assume that having exclusive lock
6015 : * on a rel guarantees there are no unserviced events in other backends ---
6016 : * but having a lock does not prevent there being such events in our own.
6017 : *
6018 : * In some scenarios it'd be reasonable to remove pending events (more
6019 : * specifically, mark them DONE by the current subxact) but without a lot
6020 : * of knowledge of the trigger semantics we can't do this in general.
6021 : * ----------
6022 : */
6023 : bool
6024 130722 : AfterTriggerPendingOnRel(Oid relid)
6025 : {
6026 : AfterTriggerEvent event;
6027 : AfterTriggerEventChunk *chunk;
6028 : int depth;
6029 :
6030 : /* Scan queued events */
6031 130758 : for_each_event_chunk(event, chunk, afterTriggers.events)
6032 : {
6033 36 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6034 :
6035 : /*
6036 : * We can ignore completed events. (Even if a DONE flag is rolled
6037 : * back by subxact abort, it's OK because the effects of the TRUNCATE
6038 : * or whatever must get rolled back too.)
6039 : */
6040 36 : if (event->ate_flags & AFTER_TRIGGER_DONE)
6041 0 : continue;
6042 :
6043 36 : if (evtshared->ats_relid == relid)
6044 18 : return true;
6045 : }
6046 :
6047 : /*
6048 : * Also scan events queued by incomplete queries. This could only matter
6049 : * if TRUNCATE/etc is executed by a function or trigger within an updating
6050 : * query on the same relation, which is pretty perverse, but let's check.
6051 : */
6052 130704 : for (depth = 0; depth <= afterTriggers.query_depth && depth < afterTriggers.maxquerydepth; depth++)
6053 : {
6054 0 : for_each_event_chunk(event, chunk, afterTriggers.query_stack[depth].events)
6055 : {
6056 0 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6057 :
6058 0 : if (event->ate_flags & AFTER_TRIGGER_DONE)
6059 0 : continue;
6060 :
6061 0 : if (evtshared->ats_relid == relid)
6062 0 : return true;
6063 : }
6064 : }
6065 :
6066 130704 : return false;
6067 : }
6068 :
6069 : /* ----------
6070 : * AfterTriggerSaveEvent()
6071 : *
6072 : * Called by ExecA[RS]...Triggers() to queue up the triggers that should
6073 : * be fired for an event.
6074 : *
6075 : * NOTE: this is called whenever there are any triggers associated with
6076 : * the event (even if they are disabled). This function decides which
6077 : * triggers actually need to be queued. It is also called after each row,
6078 : * even if there are no triggers for that event, if there are any AFTER
6079 : * STATEMENT triggers for the statement which use transition tables, so that
6080 : * the transition tuplestores can be built. Furthermore, if the transition
6081 : * capture is happening for UPDATEd rows being moved to another partition due
6082 : * to the partition-key being changed, then this function is called once when
6083 : * the row is deleted (to capture OLD row), and once when the row is inserted
6084 : * into another partition (to capture NEW row). This is done separately because
6085 : * DELETE and INSERT happen on different tables.
6086 : *
6087 : * Transition tuplestores are built now, rather than when events are pulled
6088 : * off of the queue because AFTER ROW triggers are allowed to select from the
6089 : * transition tables for the statement.
6090 : *
6091 : * This contains special support to queue the update events for the case where
6092 : * a partitioned table undergoing a cross-partition update may have foreign
6093 : * keys pointing into it. Normally, a partitioned table's row triggers are
6094 : * not fired because the leaf partition(s) which are modified as a result of
6095 : * the operation on the partitioned table contain the same triggers which are
6096 : * fired instead. But that general scheme can cause problematic behavior with
6097 : * foreign key triggers during cross-partition updates, which are implemented
6098 : * as DELETE on the source partition followed by INSERT into the destination
6099 : * partition. Specifically, firing DELETE triggers would lead to the wrong
6100 : * foreign key action to be enforced considering that the original command is
6101 : * UPDATE; in this case, this function is called with relinfo as the
6102 : * partitioned table, and src_partinfo and dst_partinfo referring to the
6103 : * source and target leaf partitions, respectively.
6104 : *
6105 : * is_crosspart_update is true either when a DELETE event is fired on the
6106 : * source partition (which is to be ignored) or an UPDATE event is fired on
6107 : * the root partitioned table.
6108 : * ----------
6109 : */
6110 : static void
6111 76802 : AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
6112 : ResultRelInfo *src_partinfo,
6113 : ResultRelInfo *dst_partinfo,
6114 : int event, bool row_trigger,
6115 : TupleTableSlot *oldslot, TupleTableSlot *newslot,
6116 : List *recheckIndexes, Bitmapset *modifiedCols,
6117 : TransitionCaptureState *transition_capture,
6118 : bool is_crosspart_update)
6119 : {
6120 76802 : Relation rel = relinfo->ri_RelationDesc;
6121 76802 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
6122 : AfterTriggerEventData new_event;
6123 : AfterTriggerSharedData new_shared;
6124 76802 : char relkind = rel->rd_rel->relkind;
6125 : int tgtype_event;
6126 : int tgtype_level;
6127 : int i;
6128 76802 : Tuplestorestate *fdw_tuplestore = NULL;
6129 :
6130 : /*
6131 : * Check state. We use a normal test not Assert because it is possible to
6132 : * reach here in the wrong state given misconfigured RI triggers, in
6133 : * particular deferring a cascade action trigger.
6134 : */
6135 76802 : if (afterTriggers.query_depth < 0)
6136 0 : elog(ERROR, "AfterTriggerSaveEvent() called outside of query");
6137 :
6138 : /* Be sure we have enough space to record events at this query depth. */
6139 76802 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6140 6332 : AfterTriggerEnlargeQueryState();
6141 :
6142 : /*
6143 : * If the directly named relation has any triggers with transition tables,
6144 : * then we need to capture transition tuples.
6145 : */
6146 76802 : if (row_trigger && transition_capture != NULL)
6147 : {
6148 65814 : TupleTableSlot *original_insert_tuple = transition_capture->tcs_original_insert_tuple;
6149 :
6150 : /*
6151 : * Capture the old tuple in the appropriate transition table based on
6152 : * the event.
6153 : */
6154 65814 : if (!TupIsNull(oldslot))
6155 : {
6156 : Tuplestorestate *old_tuplestore;
6157 :
6158 5412 : old_tuplestore = GetAfterTriggersTransitionTable(event,
6159 : oldslot,
6160 : NULL,
6161 : transition_capture);
6162 5412 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6163 : oldslot, NULL, old_tuplestore);
6164 : }
6165 :
6166 : /*
6167 : * Capture the new tuple in the appropriate transition table based on
6168 : * the event.
6169 : */
6170 65814 : if (!TupIsNull(newslot))
6171 : {
6172 : Tuplestorestate *new_tuplestore;
6173 :
6174 60714 : new_tuplestore = GetAfterTriggersTransitionTable(event,
6175 : NULL,
6176 : newslot,
6177 : transition_capture);
6178 60714 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6179 : newslot, original_insert_tuple, new_tuplestore);
6180 : }
6181 :
6182 : /*
6183 : * If transition tables are the only reason we're here, return. As
6184 : * mentioned above, we can also be here during update tuple routing in
6185 : * presence of transition tables, in which case this function is
6186 : * called separately for OLD and NEW, so we expect exactly one of them
6187 : * to be NULL.
6188 : */
6189 65814 : if (trigdesc == NULL ||
6190 65574 : (event == TRIGGER_EVENT_DELETE && !trigdesc->trig_delete_after_row) ||
6191 60594 : (event == TRIGGER_EVENT_INSERT && !trigdesc->trig_insert_after_row) ||
6192 354 : (event == TRIGGER_EVENT_UPDATE && !trigdesc->trig_update_after_row) ||
6193 36 : (event == TRIGGER_EVENT_UPDATE && (TupIsNull(oldslot) ^ TupIsNull(newslot))))
6194 65700 : return;
6195 : }
6196 :
6197 : /*
6198 : * We normally don't see partitioned tables here for row level triggers
6199 : * except in the special case of a cross-partition update. In that case,
6200 : * nodeModifyTable.c:ExecCrossPartitionUpdateForeignKey() calls here to
6201 : * queue an update event on the root target partitioned table, also
6202 : * passing the source and destination partitions and their tuples.
6203 : */
6204 : Assert(!row_trigger ||
6205 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE ||
6206 : (is_crosspart_update &&
6207 : TRIGGER_FIRED_BY_UPDATE(event) &&
6208 : src_partinfo != NULL && dst_partinfo != NULL));
6209 :
6210 : /*
6211 : * Validate the event code and collect the associated tuple CTIDs.
6212 : *
6213 : * The event code will be used both as a bitmask and an array offset, so
6214 : * validation is important to make sure we don't walk off the edge of our
6215 : * arrays.
6216 : *
6217 : * Also, if we're considering statement-level triggers, check whether we
6218 : * already queued a set of them for this event, and cancel the prior set
6219 : * if so. This preserves the behavior that statement-level triggers fire
6220 : * just once per statement and fire after row-level triggers.
6221 : */
6222 11102 : switch (event)
6223 : {
6224 5770 : case TRIGGER_EVENT_INSERT:
6225 5770 : tgtype_event = TRIGGER_TYPE_INSERT;
6226 5770 : if (row_trigger)
6227 : {
6228 : Assert(oldslot == NULL);
6229 : Assert(newslot != NULL);
6230 5334 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid1));
6231 5334 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6232 : }
6233 : else
6234 : {
6235 : Assert(oldslot == NULL);
6236 : Assert(newslot == NULL);
6237 436 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6238 436 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6239 436 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6240 : CMD_INSERT, event);
6241 : }
6242 5770 : break;
6243 1458 : case TRIGGER_EVENT_DELETE:
6244 1458 : tgtype_event = TRIGGER_TYPE_DELETE;
6245 1458 : if (row_trigger)
6246 : {
6247 : Assert(oldslot != NULL);
6248 : Assert(newslot == NULL);
6249 1222 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6250 1222 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6251 : }
6252 : else
6253 : {
6254 : Assert(oldslot == NULL);
6255 : Assert(newslot == NULL);
6256 236 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6257 236 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6258 236 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6259 : CMD_DELETE, event);
6260 : }
6261 1458 : break;
6262 3866 : case TRIGGER_EVENT_UPDATE:
6263 3866 : tgtype_event = TRIGGER_TYPE_UPDATE;
6264 3866 : if (row_trigger)
6265 : {
6266 : Assert(oldslot != NULL);
6267 : Assert(newslot != NULL);
6268 3458 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6269 3458 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid2));
6270 :
6271 : /*
6272 : * Also remember the OIDs of partitions to fetch these tuples
6273 : * out of later in AfterTriggerExecute().
6274 : */
6275 3458 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6276 : {
6277 : Assert(src_partinfo != NULL && dst_partinfo != NULL);
6278 282 : new_event.ate_src_part =
6279 282 : RelationGetRelid(src_partinfo->ri_RelationDesc);
6280 282 : new_event.ate_dst_part =
6281 282 : RelationGetRelid(dst_partinfo->ri_RelationDesc);
6282 : }
6283 : }
6284 : else
6285 : {
6286 : Assert(oldslot == NULL);
6287 : Assert(newslot == NULL);
6288 408 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6289 408 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6290 408 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6291 : CMD_UPDATE, event);
6292 : }
6293 3866 : break;
6294 8 : case TRIGGER_EVENT_TRUNCATE:
6295 8 : tgtype_event = TRIGGER_TYPE_TRUNCATE;
6296 : Assert(oldslot == NULL);
6297 : Assert(newslot == NULL);
6298 8 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6299 8 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6300 8 : break;
6301 0 : default:
6302 0 : elog(ERROR, "invalid after-trigger event code: %d", event);
6303 : tgtype_event = 0; /* keep compiler quiet */
6304 : break;
6305 : }
6306 :
6307 : /* Determine flags */
6308 11102 : if (!(relkind == RELKIND_FOREIGN_TABLE && row_trigger))
6309 : {
6310 11046 : if (row_trigger && event == TRIGGER_EVENT_UPDATE)
6311 : {
6312 3438 : if (relkind == RELKIND_PARTITIONED_TABLE)
6313 282 : new_event.ate_flags = AFTER_TRIGGER_CP_UPDATE;
6314 : else
6315 3156 : new_event.ate_flags = AFTER_TRIGGER_2CTID;
6316 : }
6317 : else
6318 7608 : new_event.ate_flags = AFTER_TRIGGER_1CTID;
6319 : }
6320 :
6321 : /* else, we'll initialize ate_flags for each trigger */
6322 :
6323 11102 : tgtype_level = (row_trigger ? TRIGGER_TYPE_ROW : TRIGGER_TYPE_STATEMENT);
6324 :
6325 : /*
6326 : * Must convert/copy the source and destination partition tuples into the
6327 : * root partitioned table's format/slot, because the processing in the
6328 : * loop below expects both oldslot and newslot tuples to be in that form.
6329 : */
6330 11102 : if (row_trigger && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6331 : {
6332 : TupleTableSlot *rootslot;
6333 : TupleConversionMap *map;
6334 :
6335 282 : rootslot = ExecGetTriggerOldSlot(estate, relinfo);
6336 282 : map = ExecGetChildToRootMap(src_partinfo);
6337 282 : if (map)
6338 36 : oldslot = execute_attr_map_slot(map->attrMap,
6339 : oldslot,
6340 : rootslot);
6341 : else
6342 246 : oldslot = ExecCopySlot(rootslot, oldslot);
6343 :
6344 282 : rootslot = ExecGetTriggerNewSlot(estate, relinfo);
6345 282 : map = ExecGetChildToRootMap(dst_partinfo);
6346 282 : if (map)
6347 36 : newslot = execute_attr_map_slot(map->attrMap,
6348 : newslot,
6349 : rootslot);
6350 : else
6351 246 : newslot = ExecCopySlot(rootslot, newslot);
6352 : }
6353 :
6354 50522 : for (i = 0; i < trigdesc->numtriggers; i++)
6355 : {
6356 39420 : Trigger *trigger = &trigdesc->triggers[i];
6357 :
6358 39420 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
6359 : tgtype_level,
6360 : TRIGGER_TYPE_AFTER,
6361 : tgtype_event))
6362 25324 : continue;
6363 14096 : if (!TriggerEnabled(estate, relinfo, trigger, event,
6364 : modifiedCols, oldslot, newslot))
6365 422 : continue;
6366 :
6367 13674 : if (relkind == RELKIND_FOREIGN_TABLE && row_trigger)
6368 : {
6369 58 : if (fdw_tuplestore == NULL)
6370 : {
6371 50 : fdw_tuplestore = GetCurrentFDWTuplestore();
6372 50 : new_event.ate_flags = AFTER_TRIGGER_FDW_FETCH;
6373 : }
6374 : else
6375 : /* subsequent event for the same tuple */
6376 8 : new_event.ate_flags = AFTER_TRIGGER_FDW_REUSE;
6377 : }
6378 :
6379 : /*
6380 : * If the trigger is a foreign key enforcement trigger, there are
6381 : * certain cases where we can skip queueing the event because we can
6382 : * tell by inspection that the FK constraint will still pass. There
6383 : * are also some cases during cross-partition updates of a partitioned
6384 : * table where queuing the event can be skipped.
6385 : */
6386 13674 : if (TRIGGER_FIRED_BY_UPDATE(event) || TRIGGER_FIRED_BY_DELETE(event))
6387 : {
6388 6736 : switch (RI_FKey_trigger_type(trigger->tgfoid))
6389 : {
6390 2746 : case RI_TRIGGER_PK:
6391 :
6392 : /*
6393 : * For cross-partitioned updates of partitioned PK table,
6394 : * skip the event fired by the component delete on the
6395 : * source leaf partition unless the constraint originates
6396 : * in the partition itself (!tgisclone), because the
6397 : * update event that will be fired on the root
6398 : * (partitioned) target table will be used to perform the
6399 : * necessary foreign key enforcement action.
6400 : */
6401 2746 : if (is_crosspart_update &&
6402 498 : TRIGGER_FIRED_BY_DELETE(event) &&
6403 264 : trigger->tgisclone)
6404 246 : continue;
6405 :
6406 : /* Update or delete on trigger's PK table */
6407 2500 : if (!RI_FKey_pk_upd_check_required(trigger, rel,
6408 : oldslot, newslot))
6409 : {
6410 : /* skip queuing this event */
6411 542 : continue;
6412 : }
6413 1958 : break;
6414 :
6415 1194 : case RI_TRIGGER_FK:
6416 :
6417 : /*
6418 : * Update on trigger's FK table. We can skip the update
6419 : * event fired on a partitioned table during a
6420 : * cross-partition of that table, because the insert event
6421 : * that is fired on the destination leaf partition would
6422 : * suffice to perform the necessary foreign key check.
6423 : * Moreover, RI_FKey_fk_upd_check_required() expects to be
6424 : * passed a tuple that contains system attributes, most of
6425 : * which are not present in the virtual slot belonging to
6426 : * a partitioned table.
6427 : */
6428 1194 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
6429 1080 : !RI_FKey_fk_upd_check_required(trigger, rel,
6430 : oldslot, newslot))
6431 : {
6432 : /* skip queuing this event */
6433 728 : continue;
6434 : }
6435 466 : break;
6436 :
6437 2796 : case RI_TRIGGER_NONE:
6438 :
6439 : /*
6440 : * Not an FK trigger. No need to queue the update event
6441 : * fired during a cross-partitioned update of a
6442 : * partitioned table, because the same row trigger must be
6443 : * present in the leaf partition(s) that are affected as
6444 : * part of this update and the events fired on them are
6445 : * queued instead.
6446 : */
6447 2796 : if (row_trigger &&
6448 2116 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6449 30 : continue;
6450 2766 : break;
6451 : }
6452 6938 : }
6453 :
6454 : /*
6455 : * If the trigger is a deferred unique constraint check trigger, only
6456 : * queue it if the unique constraint was potentially violated, which
6457 : * we know from index insertion time.
6458 : */
6459 12128 : if (trigger->tgfoid == F_UNIQUE_KEY_RECHECK)
6460 : {
6461 210 : if (!list_member_oid(recheckIndexes, trigger->tgconstrindid))
6462 88 : continue; /* Uniqueness definitely not violated */
6463 : }
6464 :
6465 : /*
6466 : * Fill in event structure and add it to the current query's queue.
6467 : * Note we set ats_table to NULL whenever this trigger doesn't use
6468 : * transition tables, to improve sharability of the shared event data.
6469 : */
6470 12040 : new_shared.ats_event =
6471 24080 : (event & TRIGGER_EVENT_OPMASK) |
6472 12040 : (row_trigger ? TRIGGER_EVENT_ROW : 0) |
6473 12040 : (trigger->tgdeferrable ? AFTER_TRIGGER_DEFERRABLE : 0) |
6474 12040 : (trigger->tginitdeferred ? AFTER_TRIGGER_INITDEFERRED : 0);
6475 12040 : new_shared.ats_tgoid = trigger->tgoid;
6476 12040 : new_shared.ats_relid = RelationGetRelid(rel);
6477 12040 : new_shared.ats_rolid = GetUserId();
6478 12040 : new_shared.ats_firing_id = 0;
6479 12040 : if ((trigger->tgoldtable || trigger->tgnewtable) &&
6480 : transition_capture != NULL)
6481 636 : new_shared.ats_table = transition_capture->tcs_private;
6482 : else
6483 11404 : new_shared.ats_table = NULL;
6484 12040 : new_shared.ats_modifiedcols = modifiedCols;
6485 :
6486 12040 : afterTriggerAddEvent(&afterTriggers.query_stack[afterTriggers.query_depth].events,
6487 : &new_event, &new_shared);
6488 : }
6489 :
6490 : /*
6491 : * Finally, spool any foreign tuple(s). The tuplestore squashes them to
6492 : * minimal tuples, so this loses any system columns. The executor lost
6493 : * those columns before us, for an unrelated reason, so this is fine.
6494 : */
6495 11102 : if (fdw_tuplestore)
6496 : {
6497 50 : if (oldslot != NULL)
6498 32 : tuplestore_puttupleslot(fdw_tuplestore, oldslot);
6499 50 : if (newslot != NULL)
6500 36 : tuplestore_puttupleslot(fdw_tuplestore, newslot);
6501 : }
6502 : }
6503 :
6504 : /*
6505 : * Detect whether we already queued BEFORE STATEMENT triggers for the given
6506 : * relation + operation, and set the flag so the next call will report "true".
6507 : */
6508 : static bool
6509 510 : before_stmt_triggers_fired(Oid relid, CmdType cmdType)
6510 : {
6511 : bool result;
6512 : AfterTriggersTableData *table;
6513 :
6514 : /* Check state, like AfterTriggerSaveEvent. */
6515 510 : if (afterTriggers.query_depth < 0)
6516 0 : elog(ERROR, "before_stmt_triggers_fired() called outside of query");
6517 :
6518 : /* Be sure we have enough space to record events at this query depth. */
6519 510 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6520 336 : AfterTriggerEnlargeQueryState();
6521 :
6522 : /*
6523 : * We keep this state in the AfterTriggersTableData that also holds
6524 : * transition tables for the relation + operation. In this way, if we are
6525 : * forced to make a new set of transition tables because more tuples get
6526 : * entered after we've already fired triggers, we will allow a new set of
6527 : * statement triggers to get queued.
6528 : */
6529 510 : table = GetAfterTriggersTableData(relid, cmdType);
6530 510 : result = table->before_trig_done;
6531 510 : table->before_trig_done = true;
6532 510 : return result;
6533 : }
6534 :
6535 : /*
6536 : * If we previously queued a set of AFTER STATEMENT triggers for the given
6537 : * relation + operation, and they've not been fired yet, cancel them. The
6538 : * caller will queue a fresh set that's after any row-level triggers that may
6539 : * have been queued by the current sub-statement, preserving (as much as
6540 : * possible) the property that AFTER ROW triggers fire before AFTER STATEMENT
6541 : * triggers, and that the latter only fire once. This deals with the
6542 : * situation where several FK enforcement triggers sequentially queue triggers
6543 : * for the same table into the same trigger query level. We can't fully
6544 : * prevent odd behavior though: if there are AFTER ROW triggers taking
6545 : * transition tables, we don't want to change the transition tables once the
6546 : * first such trigger has seen them. In such a case, any additional events
6547 : * will result in creating new transition tables and allowing new firings of
6548 : * statement triggers.
6549 : *
6550 : * This also saves the current event list location so that a later invocation
6551 : * of this function can cheaply find the triggers we're about to queue and
6552 : * cancel them.
6553 : */
6554 : static void
6555 1080 : cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent)
6556 : {
6557 : AfterTriggersTableData *table;
6558 1080 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[afterTriggers.query_depth];
6559 :
6560 : /*
6561 : * We keep this state in the AfterTriggersTableData that also holds
6562 : * transition tables for the relation + operation. In this way, if we are
6563 : * forced to make a new set of transition tables because more tuples get
6564 : * entered after we've already fired triggers, we will allow a new set of
6565 : * statement triggers to get queued without canceling the old ones.
6566 : */
6567 1080 : table = GetAfterTriggersTableData(relid, cmdType);
6568 :
6569 1080 : if (table->after_trig_done)
6570 : {
6571 : /*
6572 : * We want to start scanning from the tail location that existed just
6573 : * before we inserted any statement triggers. But the events list
6574 : * might've been entirely empty then, in which case scan from the
6575 : * current head.
6576 : */
6577 : AfterTriggerEvent event;
6578 : AfterTriggerEventChunk *chunk;
6579 :
6580 66 : if (table->after_trig_events.tail)
6581 : {
6582 60 : chunk = table->after_trig_events.tail;
6583 60 : event = (AfterTriggerEvent) table->after_trig_events.tailfree;
6584 : }
6585 : else
6586 : {
6587 6 : chunk = qs->events.head;
6588 6 : event = NULL;
6589 : }
6590 :
6591 96 : for_each_chunk_from(chunk)
6592 : {
6593 66 : if (event == NULL)
6594 6 : event = (AfterTriggerEvent) CHUNK_DATA_START(chunk);
6595 138 : for_each_event_from(event, chunk)
6596 : {
6597 108 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6598 :
6599 : /*
6600 : * Exit loop when we reach events that aren't AS triggers for
6601 : * the target relation.
6602 : */
6603 108 : if (evtshared->ats_relid != relid)
6604 0 : goto done;
6605 108 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) != tgevent)
6606 0 : goto done;
6607 108 : if (!TRIGGER_FIRED_FOR_STATEMENT(evtshared->ats_event))
6608 36 : goto done;
6609 72 : if (!TRIGGER_FIRED_AFTER(evtshared->ats_event))
6610 0 : goto done;
6611 : /* OK, mark it DONE */
6612 72 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
6613 72 : event->ate_flags |= AFTER_TRIGGER_DONE;
6614 : }
6615 : /* signal we must reinitialize event ptr for next chunk */
6616 30 : event = NULL;
6617 : }
6618 : }
6619 1044 : done:
6620 :
6621 : /* In any case, save current insertion point for next time */
6622 1080 : table->after_trig_done = true;
6623 1080 : table->after_trig_events = qs->events;
6624 1080 : }
6625 :
6626 : /*
6627 : * GUC assign_hook for session_replication_role
6628 : */
6629 : void
6630 2848 : assign_session_replication_role(int newval, void *extra)
6631 : {
6632 : /*
6633 : * Must flush the plan cache when changing replication role; but don't
6634 : * flush unnecessarily.
6635 : */
6636 2848 : if (SessionReplicationRole != newval)
6637 852 : ResetPlanCache();
6638 2848 : }
6639 :
6640 : /*
6641 : * SQL function pg_trigger_depth()
6642 : */
6643 : Datum
6644 90 : pg_trigger_depth(PG_FUNCTION_ARGS)
6645 : {
6646 90 : PG_RETURN_INT32(MyTriggerDepth);
6647 : }
6648 :
6649 : /*
6650 : * Check whether a trigger modified a virtual generated column and replace the
6651 : * value with null if so.
6652 : *
6653 : * We need to check this so that we don't end up storing a non-null value in a
6654 : * virtual generated column.
6655 : *
6656 : * We don't need to check for stored generated columns, since those will be
6657 : * overwritten later anyway.
6658 : */
6659 : static HeapTuple
6660 2062 : check_modified_virtual_generated(TupleDesc tupdesc, HeapTuple tuple)
6661 : {
6662 2062 : if (!(tupdesc->constr && tupdesc->constr->has_generated_virtual))
6663 2044 : return tuple;
6664 :
6665 66 : for (int i = 0; i < tupdesc->natts; i++)
6666 : {
6667 48 : if (TupleDescAttr(tupdesc, i)->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
6668 : {
6669 18 : if (!heap_attisnull(tuple, i + 1, tupdesc))
6670 : {
6671 12 : int replCol = i + 1;
6672 12 : Datum replValue = 0;
6673 12 : bool replIsnull = true;
6674 :
6675 12 : tuple = heap_modify_tuple_by_cols(tuple, tupdesc, 1, &replCol, &replValue, &replIsnull);
6676 : }
6677 : }
6678 : }
6679 :
6680 18 : return tuple;
6681 : }
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