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/trigger.h"
34 : #include "executor/executor.h"
35 : #include "miscadmin.h"
36 : #include "nodes/bitmapset.h"
37 : #include "nodes/makefuncs.h"
38 : #include "optimizer/optimizer.h"
39 : #include "parser/parse_clause.h"
40 : #include "parser/parse_collate.h"
41 : #include "parser/parse_func.h"
42 : #include "parser/parse_relation.h"
43 : #include "partitioning/partdesc.h"
44 : #include "pgstat.h"
45 : #include "rewrite/rewriteHandler.h"
46 : #include "rewrite/rewriteManip.h"
47 : #include "storage/lmgr.h"
48 : #include "utils/acl.h"
49 : #include "utils/builtins.h"
50 : #include "utils/fmgroids.h"
51 : #include "utils/guc_hooks.h"
52 : #include "utils/inval.h"
53 : #include "utils/lsyscache.h"
54 : #include "utils/memutils.h"
55 : #include "utils/plancache.h"
56 : #include "utils/rel.h"
57 : #include "utils/snapmgr.h"
58 : #include "utils/syscache.h"
59 : #include "utils/tuplestore.h"
60 :
61 :
62 : /* GUC variables */
63 : int SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
64 :
65 : /* How many levels deep into trigger execution are we? */
66 : static int MyTriggerDepth = 0;
67 :
68 : /* Local function prototypes */
69 : static void renametrig_internal(Relation tgrel, Relation targetrel,
70 : HeapTuple trigtup, const char *newname,
71 : const char *expected_name);
72 : static void renametrig_partition(Relation tgrel, Oid partitionId,
73 : Oid parentTriggerOid, const char *newname,
74 : const char *expected_name);
75 : static void SetTriggerFlags(TriggerDesc *trigdesc, Trigger *trigger);
76 : static bool GetTupleForTrigger(EState *estate,
77 : EPQState *epqstate,
78 : ResultRelInfo *relinfo,
79 : ItemPointer tid,
80 : LockTupleMode lockmode,
81 : TupleTableSlot *oldslot,
82 : bool do_epq_recheck,
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 15996 : 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 15996 : 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 16812 : 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 16812 : HeapTuple tuple = NULL;
196 : Oid funcrettype;
197 16812 : Oid trigoid = InvalidOid;
198 : char internaltrigname[NAMEDATALEN];
199 : char *trigname;
200 16812 : Oid constrrelid = InvalidOid;
201 : ObjectAddress myself,
202 : referenced;
203 16812 : char *oldtablename = NULL;
204 16812 : char *newtablename = NULL;
205 : bool partition_recurse;
206 16812 : bool trigger_exists = false;
207 16812 : Oid existing_constraint_oid = InvalidOid;
208 16812 : bool existing_isInternal = false;
209 16812 : bool existing_isClone = false;
210 :
211 16812 : if (OidIsValid(relOid))
212 13600 : rel = table_open(relOid, ShareRowExclusiveLock);
213 : else
214 3212 : 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 16812 : if (rel->rd_rel->relkind == RELKIND_RELATION)
221 : {
222 : /* Tables can't have INSTEAD OF triggers */
223 13750 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
224 12418 : 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 3062 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
232 : {
233 : /* Partitioned tables can't have INSTEAD OF triggers */
234 2748 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
235 2646 : 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 2742 : 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 2506 : 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 16728 : 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 16726 : 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 12942 : if (OidIsValid(refRelOid))
331 : {
332 12670 : LockRelationOid(refRelOid, AccessShareLock);
333 12670 : 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 16726 : if (!isInternal)
342 : {
343 3942 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
344 : ACL_TRIGGER);
345 3942 : if (aclresult != ACLCHECK_OK)
346 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
347 0 : RelationGetRelationName(rel));
348 :
349 3942 : 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 19640 : partition_recurse = !isInternal && stmt->row &&
366 2914 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE;
367 16726 : if (partition_recurse)
368 398 : list_free(find_all_inheritors(RelationGetRelid(rel),
369 : ShareRowExclusiveLock, NULL));
370 :
371 : /* Compute tgtype */
372 16726 : TRIGGER_CLEAR_TYPE(tgtype);
373 16726 : if (stmt->row)
374 15698 : TRIGGER_SETT_ROW(tgtype);
375 16726 : tgtype |= stmt->timing;
376 16726 : tgtype |= stmt->events;
377 :
378 : /* Disallow ROW-level TRUNCATE triggers */
379 16726 : 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 16726 : 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 16708 : if (stmt->transitionRels != NIL)
416 : {
417 458 : List *varList = stmt->transitionRels;
418 : ListCell *lc;
419 :
420 998 : foreach(lc, varList)
421 : {
422 588 : TriggerTransition *tt = lfirst_node(TriggerTransition, lc);
423 :
424 588 : 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 :
436 588 : 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 :
443 582 : 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 : */
458 576 : 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 :
471 564 : 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 :
476 564 : 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 : */
491 558 : if (((TRIGGER_FOR_INSERT(tgtype) ? 1 : 0) +
492 558 : (TRIGGER_FOR_UPDATE(tgtype) ? 1 : 0) +
493 558 : (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 : */
504 552 : 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 :
518 546 : if (tt->isNew)
519 : {
520 288 : if (!(TRIGGER_FOR_INSERT(tgtype) ||
521 156 : 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 :
526 288 : if (newtablename != NULL)
527 0 : ereport(ERROR,
528 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
529 : errmsg("NEW TABLE cannot be specified multiple times")));
530 :
531 288 : newtablename = tt->name;
532 : }
533 : else
534 : {
535 258 : if (!(TRIGGER_FOR_DELETE(tgtype) ||
536 150 : 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 :
541 252 : if (oldtablename != NULL)
542 0 : ereport(ERROR,
543 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
544 : errmsg("OLD TABLE cannot be specified multiple times")));
545 :
546 252 : oldtablename = tt->name;
547 : }
548 : }
549 :
550 410 : if (newtablename != NULL && oldtablename != NULL &&
551 130 : 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 16660 : 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 16476 : else if (!whenClause)
678 : {
679 16434 : whenClause = NULL;
680 16434 : whenRtable = NIL;
681 16434 : 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 16612 : if (!OidIsValid(funcoid))
693 15796 : funcoid = LookupFuncName(stmt->funcname, 0, NULL, false);
694 16612 : if (!isInternal)
695 : {
696 3828 : aclresult = object_aclcheck(ProcedureRelationId, funcoid, GetUserId(), ACL_EXECUTE);
697 3828 : if (aclresult != ACLCHECK_OK)
698 0 : aclcheck_error(aclresult, OBJECT_FUNCTION,
699 0 : NameListToString(stmt->funcname));
700 : }
701 16612 : funcrettype = get_func_rettype(funcoid);
702 16612 : 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 16612 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
717 16612 : if (!isInternal)
718 : {
719 : ScanKeyData skeys[2];
720 : SysScanDesc tgscan;
721 :
722 3828 : ScanKeyInit(&skeys[0],
723 : Anum_pg_trigger_tgrelid,
724 : BTEqualStrategyNumber, F_OIDEQ,
725 : ObjectIdGetDatum(RelationGetRelid(rel)));
726 :
727 3828 : ScanKeyInit(&skeys[1],
728 : Anum_pg_trigger_tgname,
729 : BTEqualStrategyNumber, F_NAMEEQ,
730 3828 : CStringGetDatum(stmt->trigname));
731 :
732 3828 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
733 : NULL, 2, skeys);
734 :
735 : /* There should be at most one matching tuple */
736 3828 : 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 3828 : systable_endscan(tgscan);
749 : }
750 :
751 16612 : if (!trigger_exists)
752 : {
753 : /* Generate the OID for the new trigger. */
754 16510 : 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 16588 : 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 16588 : if (isInternal)
851 : {
852 12784 : snprintf(internaltrigname, sizeof(internaltrigname),
853 : "%s_%u", stmt->trigname, trigoid);
854 12784 : trigname = internaltrigname;
855 : }
856 : else
857 : {
858 : /* user-defined trigger; use the specified trigger name as-is */
859 3804 : trigname = stmt->trigname;
860 : }
861 :
862 : /*
863 : * Build the new pg_trigger tuple.
864 : */
865 16588 : memset(nulls, false, sizeof(nulls));
866 :
867 16588 : values[Anum_pg_trigger_oid - 1] = ObjectIdGetDatum(trigoid);
868 16588 : values[Anum_pg_trigger_tgrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
869 16588 : values[Anum_pg_trigger_tgparentid - 1] = ObjectIdGetDatum(parentTriggerOid);
870 16588 : values[Anum_pg_trigger_tgname - 1] = DirectFunctionCall1(namein,
871 : CStringGetDatum(trigname));
872 16588 : values[Anum_pg_trigger_tgfoid - 1] = ObjectIdGetDatum(funcoid);
873 16588 : values[Anum_pg_trigger_tgtype - 1] = Int16GetDatum(tgtype);
874 16588 : values[Anum_pg_trigger_tgenabled - 1] = CharGetDatum(trigger_fires_when);
875 16588 : values[Anum_pg_trigger_tgisinternal - 1] = BoolGetDatum(isInternal);
876 16588 : values[Anum_pg_trigger_tgconstrrelid - 1] = ObjectIdGetDatum(constrrelid);
877 16588 : values[Anum_pg_trigger_tgconstrindid - 1] = ObjectIdGetDatum(indexOid);
878 16588 : values[Anum_pg_trigger_tgconstraint - 1] = ObjectIdGetDatum(constraintOid);
879 16588 : values[Anum_pg_trigger_tgdeferrable - 1] = BoolGetDatum(stmt->deferrable);
880 16588 : values[Anum_pg_trigger_tginitdeferred - 1] = BoolGetDatum(stmt->initdeferred);
881 :
882 16588 : if (stmt->args)
883 : {
884 : ListCell *le;
885 : char *args;
886 456 : int16 nargs = list_length(stmt->args);
887 456 : int len = 0;
888 :
889 1092 : foreach(le, stmt->args)
890 : {
891 636 : char *ar = strVal(lfirst(le));
892 :
893 636 : len += strlen(ar) + 4;
894 5364 : for (; *ar; ar++)
895 : {
896 4728 : if (*ar == '\\')
897 0 : len++;
898 : }
899 : }
900 456 : args = (char *) palloc(len + 1);
901 456 : args[0] = '\0';
902 1092 : foreach(le, stmt->args)
903 : {
904 636 : char *s = strVal(lfirst(le));
905 636 : char *d = args + strlen(args);
906 :
907 5364 : while (*s)
908 : {
909 4728 : if (*s == '\\')
910 0 : *d++ = '\\';
911 4728 : *d++ = *s++;
912 : }
913 636 : strcpy(d, "\\000");
914 : }
915 456 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(nargs);
916 456 : values[Anum_pg_trigger_tgargs - 1] = DirectFunctionCall1(byteain,
917 : CStringGetDatum(args));
918 : }
919 : else
920 : {
921 16132 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(0);
922 16132 : 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 16588 : ncolumns = list_length(stmt->columns);
928 16588 : if (ncolumns == 0)
929 16482 : 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 16582 : tgattr = buildint2vector(columns, ncolumns);
964 16582 : values[Anum_pg_trigger_tgattr - 1] = PointerGetDatum(tgattr);
965 :
966 : /* set tgqual if trigger has WHEN clause */
967 16582 : if (qual)
968 178 : values[Anum_pg_trigger_tgqual - 1] = CStringGetTextDatum(qual);
969 : else
970 16404 : nulls[Anum_pg_trigger_tgqual - 1] = true;
971 :
972 16582 : if (oldtablename)
973 252 : values[Anum_pg_trigger_tgoldtable - 1] = DirectFunctionCall1(namein,
974 : CStringGetDatum(oldtablename));
975 : else
976 16330 : nulls[Anum_pg_trigger_tgoldtable - 1] = true;
977 16582 : if (newtablename)
978 288 : values[Anum_pg_trigger_tgnewtable - 1] = DirectFunctionCall1(namein,
979 : CStringGetDatum(newtablename));
980 : else
981 16294 : nulls[Anum_pg_trigger_tgnewtable - 1] = true;
982 :
983 : /*
984 : * Insert or replace tuple in pg_trigger.
985 : */
986 16582 : if (!trigger_exists)
987 : {
988 16504 : tuple = heap_form_tuple(tgrel->rd_att, values, nulls);
989 16504 : 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 16582 : heap_freetuple(tuple); /* free either original or new tuple */
1001 16582 : table_close(tgrel, RowExclusiveLock);
1002 :
1003 16582 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
1004 16582 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgargs - 1]));
1005 16582 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgattr - 1]));
1006 16582 : if (oldtablename)
1007 252 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgoldtable - 1]));
1008 16582 : if (newtablename)
1009 288 : 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 16582 : pgrel = table_open(RelationRelationId, RowExclusiveLock);
1016 16582 : tuple = SearchSysCacheCopy1(RELOID,
1017 : ObjectIdGetDatum(RelationGetRelid(rel)));
1018 16582 : if (!HeapTupleIsValid(tuple))
1019 0 : elog(ERROR, "cache lookup failed for relation %u",
1020 : RelationGetRelid(rel));
1021 16582 : if (!((Form_pg_class) GETSTRUCT(tuple))->relhastriggers)
1022 : {
1023 6268 : ((Form_pg_class) GETSTRUCT(tuple))->relhastriggers = true;
1024 :
1025 6268 : CatalogTupleUpdate(pgrel, &tuple->t_self, tuple);
1026 :
1027 6268 : CommandCounterIncrement();
1028 : }
1029 : else
1030 10314 : CacheInvalidateRelcacheByTuple(tuple);
1031 :
1032 16582 : heap_freetuple(tuple);
1033 16582 : 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 16582 : 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 16582 : myself.classId = TriggerRelationId;
1047 16582 : myself.objectId = trigoid;
1048 16582 : myself.objectSubId = 0;
1049 :
1050 16582 : referenced.classId = ProcedureRelationId;
1051 16582 : referenced.objectId = funcoid;
1052 16582 : referenced.objectSubId = 0;
1053 16582 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1054 :
1055 16582 : 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 12784 : referenced.classId = ConstraintRelationId;
1064 12784 : referenced.objectId = constraintOid;
1065 12784 : referenced.objectSubId = 0;
1066 12784 : 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 3798 : referenced.classId = RelationRelationId;
1076 3798 : referenced.objectId = RelationGetRelid(rel);
1077 3798 : referenced.objectSubId = 0;
1078 3798 : recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
1079 :
1080 3798 : 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 3798 : 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 3798 : 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 16582 : 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 16582 : if (whenRtable != NIL)
1133 136 : recordDependencyOnExpr(&myself, whenClause, whenRtable,
1134 : DEPENDENCY_NORMAL);
1135 :
1136 : /* Post creation hook for new trigger */
1137 16582 : InvokeObjectPostCreateHookArg(TriggerRelationId, trigoid, 0,
1138 : isInternal);
1139 :
1140 : /*
1141 : * Lastly, create the trigger on child relations, if needed.
1142 : */
1143 16582 : 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 16576 : table_close(rel, NoLock);
1206 :
1207 16576 : 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 504 : 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 504 : ScanKeyInit(&skey[0],
1237 : Anum_pg_trigger_oid,
1238 : BTEqualStrategyNumber, F_OIDEQ,
1239 : ObjectIdGetDatum(childTrigId));
1240 :
1241 504 : tgscan = systable_beginscan(trigRel, TriggerOidIndexId, true,
1242 : NULL, 1, skey);
1243 :
1244 504 : tuple = systable_getnext(tgscan);
1245 504 : if (!HeapTupleIsValid(tuple))
1246 0 : elog(ERROR, "could not find tuple for trigger %u", childTrigId);
1247 504 : newtup = heap_copytuple(tuple);
1248 504 : trigForm = (Form_pg_trigger) GETSTRUCT(newtup);
1249 504 : if (OidIsValid(parentTrigId))
1250 : {
1251 : /* don't allow setting parent for a constraint that already has one */
1252 300 : if (OidIsValid(trigForm->tgparentid))
1253 0 : elog(ERROR, "trigger %u already has a parent trigger",
1254 : childTrigId);
1255 :
1256 300 : trigForm->tgparentid = parentTrigId;
1257 :
1258 300 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1259 :
1260 300 : ObjectAddressSet(depender, TriggerRelationId, childTrigId);
1261 :
1262 300 : ObjectAddressSet(referenced, TriggerRelationId, parentTrigId);
1263 300 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_PRI);
1264 :
1265 300 : ObjectAddressSet(referenced, RelationRelationId, childTableId);
1266 300 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_SEC);
1267 : }
1268 : else
1269 : {
1270 204 : trigForm->tgparentid = InvalidOid;
1271 :
1272 204 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1273 :
1274 204 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1275 : TriggerRelationId,
1276 : DEPENDENCY_PARTITION_PRI);
1277 204 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1278 : RelationRelationId,
1279 : DEPENDENCY_PARTITION_SEC);
1280 : }
1281 :
1282 504 : heap_freetuple(newtup);
1283 504 : systable_endscan(tgscan);
1284 504 : }
1285 :
1286 :
1287 : /*
1288 : * Guts of trigger deletion.
1289 : */
1290 : void
1291 14420 : 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 14420 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1301 :
1302 : /*
1303 : * Find the trigger to delete.
1304 : */
1305 14420 : ScanKeyInit(&skey[0],
1306 : Anum_pg_trigger_oid,
1307 : BTEqualStrategyNumber, F_OIDEQ,
1308 : ObjectIdGetDatum(trigOid));
1309 :
1310 14420 : tgscan = systable_beginscan(tgrel, TriggerOidIndexId, true,
1311 : NULL, 1, skey);
1312 :
1313 14420 : tup = systable_getnext(tgscan);
1314 14420 : 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 14420 : relid = ((Form_pg_trigger) GETSTRUCT(tup))->tgrelid;
1321 :
1322 14420 : rel = table_open(relid, AccessExclusiveLock);
1323 :
1324 14420 : if (rel->rd_rel->relkind != RELKIND_RELATION &&
1325 2648 : rel->rd_rel->relkind != RELKIND_VIEW &&
1326 2512 : rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
1327 2420 : 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 14420 : 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 14420 : CatalogTupleDelete(tgrel, &tup->t_self);
1344 :
1345 14420 : systable_endscan(tgscan);
1346 14420 : 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 14420 : CacheInvalidateRelcache(rel);
1358 :
1359 : /* Keep lock on trigger's rel until end of xact */
1360 14420 : table_close(rel, NoLock);
1361 14420 : }
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 790 : 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 790 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1382 :
1383 790 : ScanKeyInit(&skey[0],
1384 : Anum_pg_trigger_tgrelid,
1385 : BTEqualStrategyNumber, F_OIDEQ,
1386 : ObjectIdGetDatum(relid));
1387 790 : ScanKeyInit(&skey[1],
1388 : Anum_pg_trigger_tgname,
1389 : BTEqualStrategyNumber, F_NAMEEQ,
1390 : CStringGetDatum(trigname));
1391 :
1392 790 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1393 : NULL, 2, skey);
1394 :
1395 790 : tup = systable_getnext(tgscan);
1396 :
1397 790 : 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 760 : oid = ((Form_pg_trigger) GETSTRUCT(tup))->oid;
1409 : }
1410 :
1411 766 : systable_endscan(tgscan);
1412 766 : table_close(tgrel, AccessShareLock);
1413 766 : return oid;
1414 : }
1415 :
1416 : /*
1417 : * Perform permissions and integrity checks before acquiring a relation lock.
1418 : */
1419 : static void
1420 40 : RangeVarCallbackForRenameTrigger(const RangeVar *rv, Oid relid, Oid oldrelid,
1421 : void *arg)
1422 : {
1423 : HeapTuple tuple;
1424 : Form_pg_class form;
1425 :
1426 40 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
1427 40 : if (!HeapTupleIsValid(tuple))
1428 0 : return; /* concurrently dropped */
1429 40 : form = (Form_pg_class) GETSTRUCT(tuple);
1430 :
1431 : /* only tables and views can have triggers */
1432 40 : if (form->relkind != RELKIND_RELATION && form->relkind != RELKIND_VIEW &&
1433 24 : form->relkind != RELKIND_FOREIGN_TABLE &&
1434 24 : 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 40 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
1443 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
1444 40 : 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 38 : 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 452 : 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 452 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1740 :
1741 452 : ScanKeyInit(&keys[0],
1742 : Anum_pg_trigger_tgrelid,
1743 : BTEqualStrategyNumber, F_OIDEQ,
1744 : ObjectIdGetDatum(RelationGetRelid(rel)));
1745 452 : if (tgname)
1746 : {
1747 318 : ScanKeyInit(&keys[1],
1748 : Anum_pg_trigger_tgname,
1749 : BTEqualStrategyNumber, F_NAMEEQ,
1750 : CStringGetDatum(tgname));
1751 318 : nkeys = 2;
1752 : }
1753 : else
1754 134 : nkeys = 1;
1755 :
1756 452 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1757 : NULL, nkeys, keys);
1758 :
1759 452 : found = changed = false;
1760 :
1761 1180 : while (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1762 : {
1763 728 : Form_pg_trigger oldtrig = (Form_pg_trigger) GETSTRUCT(tuple);
1764 :
1765 728 : if (OidIsValid(tgparent) && tgparent != oldtrig->tgparentid)
1766 192 : continue;
1767 :
1768 536 : if (oldtrig->tgisinternal)
1769 : {
1770 : /* system trigger ... ok to process? */
1771 72 : if (skip_system)
1772 12 : continue;
1773 60 : 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 524 : found = true;
1781 :
1782 524 : if (oldtrig->tgenabled != fires_when)
1783 : {
1784 : /* need to change this one ... make a copy to scribble on */
1785 494 : HeapTuple newtup = heap_copytuple(tuple);
1786 494 : Form_pg_trigger newtrig = (Form_pg_trigger) GETSTRUCT(newtup);
1787 :
1788 494 : newtrig->tgenabled = fires_when;
1789 :
1790 494 : CatalogTupleUpdate(tgrel, &newtup->t_self, newtup);
1791 :
1792 494 : heap_freetuple(newtup);
1793 :
1794 494 : 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 524 : if (recurse &&
1807 496 : 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 524 : InvokeObjectPostAlterHook(TriggerRelationId,
1827 : oldtrig->oid, 0);
1828 : }
1829 :
1830 452 : systable_endscan(tgscan);
1831 :
1832 452 : table_close(tgrel, RowExclusiveLock);
1833 :
1834 452 : 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 452 : if (changed)
1846 446 : CacheInvalidateRelcache(rel);
1847 452 : }
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 63062 : 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 63062 : maxtrigs = 16;
1879 63062 : triggers = (Trigger *) palloc(maxtrigs * sizeof(Trigger));
1880 63062 : 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 63062 : ScanKeyInit(&skey,
1889 : Anum_pg_trigger_tgrelid,
1890 : BTEqualStrategyNumber, F_OIDEQ,
1891 : ObjectIdGetDatum(RelationGetRelid(relation)));
1892 :
1893 63062 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1894 63062 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1895 : NULL, 1, &skey);
1896 :
1897 177768 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
1898 : {
1899 114706 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
1900 : Trigger *build;
1901 : Datum datum;
1902 : bool isnull;
1903 :
1904 114706 : if (numtrigs >= maxtrigs)
1905 : {
1906 48 : maxtrigs *= 2;
1907 48 : triggers = (Trigger *) repalloc(triggers, maxtrigs * sizeof(Trigger));
1908 : }
1909 114706 : build = &(triggers[numtrigs]);
1910 :
1911 114706 : build->tgoid = pg_trigger->oid;
1912 114706 : build->tgname = DatumGetCString(DirectFunctionCall1(nameout,
1913 : NameGetDatum(&pg_trigger->tgname)));
1914 114706 : build->tgfoid = pg_trigger->tgfoid;
1915 114706 : build->tgtype = pg_trigger->tgtype;
1916 114706 : build->tgenabled = pg_trigger->tgenabled;
1917 114706 : build->tgisinternal = pg_trigger->tgisinternal;
1918 114706 : build->tgisclone = OidIsValid(pg_trigger->tgparentid);
1919 114706 : build->tgconstrrelid = pg_trigger->tgconstrrelid;
1920 114706 : build->tgconstrindid = pg_trigger->tgconstrindid;
1921 114706 : build->tgconstraint = pg_trigger->tgconstraint;
1922 114706 : build->tgdeferrable = pg_trigger->tgdeferrable;
1923 114706 : build->tginitdeferred = pg_trigger->tginitdeferred;
1924 114706 : build->tgnargs = pg_trigger->tgnargs;
1925 : /* tgattr is first var-width field, so OK to access directly */
1926 114706 : build->tgnattr = pg_trigger->tgattr.dim1;
1927 114706 : 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 114176 : build->tgattr = NULL;
1935 114706 : if (build->tgnargs > 0)
1936 : {
1937 : bytea *val;
1938 : char *p;
1939 :
1940 2786 : val = DatumGetByteaPP(fastgetattr(htup,
1941 : Anum_pg_trigger_tgargs,
1942 : tgrel->rd_att, &isnull));
1943 2786 : if (isnull)
1944 0 : elog(ERROR, "tgargs is null in trigger for relation \"%s\"",
1945 : RelationGetRelationName(relation));
1946 2786 : p = (char *) VARDATA_ANY(val);
1947 2786 : build->tgargs = (char **) palloc(build->tgnargs * sizeof(char *));
1948 6036 : for (i = 0; i < build->tgnargs; i++)
1949 : {
1950 3250 : build->tgargs[i] = pstrdup(p);
1951 3250 : p += strlen(p) + 1;
1952 : }
1953 : }
1954 : else
1955 111920 : build->tgargs = NULL;
1956 :
1957 114706 : datum = fastgetattr(htup, Anum_pg_trigger_tgoldtable,
1958 : tgrel->rd_att, &isnull);
1959 114706 : if (!isnull)
1960 1020 : build->tgoldtable =
1961 1020 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1962 : else
1963 113686 : build->tgoldtable = NULL;
1964 :
1965 114706 : datum = fastgetattr(htup, Anum_pg_trigger_tgnewtable,
1966 : tgrel->rd_att, &isnull);
1967 114706 : if (!isnull)
1968 1336 : build->tgnewtable =
1969 1336 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1970 : else
1971 113370 : build->tgnewtable = NULL;
1972 :
1973 114706 : datum = fastgetattr(htup, Anum_pg_trigger_tgqual,
1974 : tgrel->rd_att, &isnull);
1975 114706 : if (!isnull)
1976 926 : build->tgqual = TextDatumGetCString(datum);
1977 : else
1978 113780 : build->tgqual = NULL;
1979 :
1980 114706 : numtrigs++;
1981 : }
1982 :
1983 63062 : systable_endscan(tgscan);
1984 63062 : table_close(tgrel, AccessShareLock);
1985 :
1986 : /* There might not be any triggers */
1987 63062 : if (numtrigs == 0)
1988 : {
1989 14306 : pfree(triggers);
1990 14306 : return;
1991 : }
1992 :
1993 : /* Build trigdesc */
1994 48756 : trigdesc = (TriggerDesc *) palloc0(sizeof(TriggerDesc));
1995 48756 : trigdesc->triggers = triggers;
1996 48756 : trigdesc->numtriggers = numtrigs;
1997 163462 : for (i = 0; i < numtrigs; i++)
1998 114706 : SetTriggerFlags(trigdesc, &(triggers[i]));
1999 :
2000 : /* Copy completed trigdesc into cache storage */
2001 48756 : oldContext = MemoryContextSwitchTo(CacheMemoryContext);
2002 48756 : relation->trigdesc = CopyTriggerDesc(trigdesc);
2003 48756 : MemoryContextSwitchTo(oldContext);
2004 :
2005 : /* Release working memory */
2006 48756 : FreeTriggerDesc(trigdesc);
2007 : }
2008 :
2009 : /*
2010 : * Update the TriggerDesc's hint flags to include the specified trigger
2011 : */
2012 : static void
2013 114706 : SetTriggerFlags(TriggerDesc *trigdesc, Trigger *trigger)
2014 : {
2015 114706 : int16 tgtype = trigger->tgtype;
2016 :
2017 114706 : trigdesc->trig_insert_before_row |=
2018 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2019 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2020 114706 : trigdesc->trig_insert_after_row |=
2021 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2022 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2023 114706 : trigdesc->trig_insert_instead_row |=
2024 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2025 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_INSERT);
2026 114706 : trigdesc->trig_insert_before_statement |=
2027 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2028 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2029 114706 : trigdesc->trig_insert_after_statement |=
2030 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2031 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2032 114706 : trigdesc->trig_update_before_row |=
2033 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2034 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2035 114706 : trigdesc->trig_update_after_row |=
2036 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2037 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2038 114706 : trigdesc->trig_update_instead_row |=
2039 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2040 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_UPDATE);
2041 114706 : trigdesc->trig_update_before_statement |=
2042 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2043 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2044 114706 : trigdesc->trig_update_after_statement |=
2045 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2046 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2047 114706 : trigdesc->trig_delete_before_row |=
2048 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2049 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2050 114706 : trigdesc->trig_delete_after_row |=
2051 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2052 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2053 114706 : trigdesc->trig_delete_instead_row |=
2054 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2055 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_DELETE);
2056 114706 : trigdesc->trig_delete_before_statement |=
2057 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2058 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2059 114706 : trigdesc->trig_delete_after_statement |=
2060 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2061 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2062 : /* there are no row-level truncate triggers */
2063 114706 : trigdesc->trig_truncate_before_statement |=
2064 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2065 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_TRUNCATE);
2066 114706 : trigdesc->trig_truncate_after_statement |=
2067 114706 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2068 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_TRUNCATE);
2069 :
2070 229412 : trigdesc->trig_insert_new_table |=
2071 152130 : (TRIGGER_FOR_INSERT(tgtype) &&
2072 37424 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2073 229412 : trigdesc->trig_update_old_table |=
2074 166942 : (TRIGGER_FOR_UPDATE(tgtype) &&
2075 52236 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2076 229412 : trigdesc->trig_update_new_table |=
2077 166942 : (TRIGGER_FOR_UPDATE(tgtype) &&
2078 52236 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2079 229412 : trigdesc->trig_delete_old_table |=
2080 146648 : (TRIGGER_FOR_DELETE(tgtype) &&
2081 31942 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2082 114706 : }
2083 :
2084 : /*
2085 : * Copy a TriggerDesc data structure.
2086 : *
2087 : * The copy is allocated in the current memory context.
2088 : */
2089 : TriggerDesc *
2090 487146 : CopyTriggerDesc(TriggerDesc *trigdesc)
2091 : {
2092 : TriggerDesc *newdesc;
2093 : Trigger *trigger;
2094 : int i;
2095 :
2096 487146 : if (trigdesc == NULL || trigdesc->numtriggers <= 0)
2097 421038 : return NULL;
2098 :
2099 66108 : newdesc = (TriggerDesc *) palloc(sizeof(TriggerDesc));
2100 66108 : memcpy(newdesc, trigdesc, sizeof(TriggerDesc));
2101 :
2102 66108 : trigger = (Trigger *) palloc(trigdesc->numtriggers * sizeof(Trigger));
2103 66108 : memcpy(trigger, trigdesc->triggers,
2104 66108 : trigdesc->numtriggers * sizeof(Trigger));
2105 66108 : newdesc->triggers = trigger;
2106 :
2107 229174 : for (i = 0; i < trigdesc->numtriggers; i++)
2108 : {
2109 163066 : trigger->tgname = pstrdup(trigger->tgname);
2110 163066 : 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 163066 : if (trigger->tgnargs > 0)
2120 : {
2121 : char **newargs;
2122 : int16 j;
2123 :
2124 8948 : newargs = (char **) palloc(trigger->tgnargs * sizeof(char *));
2125 19054 : for (j = 0; j < trigger->tgnargs; j++)
2126 10106 : newargs[j] = pstrdup(trigger->tgargs[j]);
2127 8948 : trigger->tgargs = newargs;
2128 : }
2129 163066 : if (trigger->tgqual)
2130 1496 : trigger->tgqual = pstrdup(trigger->tgqual);
2131 163066 : if (trigger->tgoldtable)
2132 2248 : trigger->tgoldtable = pstrdup(trigger->tgoldtable);
2133 163066 : if (trigger->tgnewtable)
2134 2602 : trigger->tgnewtable = pstrdup(trigger->tgnewtable);
2135 163066 : trigger++;
2136 : }
2137 :
2138 66108 : return newdesc;
2139 : }
2140 :
2141 : /*
2142 : * Free a TriggerDesc data structure.
2143 : */
2144 : void
2145 1275752 : FreeTriggerDesc(TriggerDesc *trigdesc)
2146 : {
2147 : Trigger *trigger;
2148 : int i;
2149 :
2150 1275752 : if (trigdesc == NULL)
2151 1182332 : return;
2152 :
2153 93420 : trigger = trigdesc->triggers;
2154 310582 : for (i = 0; i < trigdesc->numtriggers; i++)
2155 : {
2156 217162 : pfree(trigger->tgname);
2157 217162 : if (trigger->tgnattr > 0)
2158 994 : pfree(trigger->tgattr);
2159 217162 : if (trigger->tgnargs > 0)
2160 : {
2161 11252 : while (--(trigger->tgnargs) >= 0)
2162 6060 : pfree(trigger->tgargs[trigger->tgnargs]);
2163 5192 : pfree(trigger->tgargs);
2164 : }
2165 217162 : if (trigger->tgqual)
2166 1708 : pfree(trigger->tgqual);
2167 217162 : if (trigger->tgoldtable)
2168 1952 : pfree(trigger->tgoldtable);
2169 217162 : if (trigger->tgnewtable)
2170 2564 : pfree(trigger->tgnewtable);
2171 217162 : trigger++;
2172 : }
2173 93420 : pfree(trigdesc->triggers);
2174 93420 : 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 2700 : FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc)
2278 : {
2279 2700 : if (trigdesc != NULL)
2280 : {
2281 : int i;
2282 :
2283 612 : for (i = 0; i < trigdesc->numtriggers; ++i)
2284 : {
2285 438 : Trigger *trigger = &trigdesc->triggers[i];
2286 :
2287 438 : if (!TRIGGER_FOR_ROW(trigger->tgtype))
2288 36 : continue;
2289 402 : if (trigger->tgoldtable != NULL || trigger->tgnewtable != NULL)
2290 12 : return trigger->tgname;
2291 : }
2292 : }
2293 :
2294 2688 : return NULL;
2295 : }
2296 :
2297 : /*
2298 : * Call a trigger function.
2299 : *
2300 : * trigdata: trigger descriptor.
2301 : * tgindx: trigger's index in finfo and instr arrays.
2302 : * finfo: array of cached trigger function call information.
2303 : * instr: optional array of EXPLAIN ANALYZE instrumentation state.
2304 : * per_tuple_context: memory context to execute the function in.
2305 : *
2306 : * Returns the tuple (or NULL) as returned by the function.
2307 : */
2308 : static HeapTuple
2309 21936 : ExecCallTriggerFunc(TriggerData *trigdata,
2310 : int tgindx,
2311 : FmgrInfo *finfo,
2312 : Instrumentation *instr,
2313 : MemoryContext per_tuple_context)
2314 : {
2315 21936 : LOCAL_FCINFO(fcinfo, 0);
2316 : PgStat_FunctionCallUsage fcusage;
2317 : Datum result;
2318 : MemoryContext oldContext;
2319 :
2320 : /*
2321 : * Protect against code paths that may fail to initialize transition table
2322 : * info.
2323 : */
2324 : Assert(((TRIGGER_FIRED_BY_INSERT(trigdata->tg_event) ||
2325 : TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event) ||
2326 : TRIGGER_FIRED_BY_DELETE(trigdata->tg_event)) &&
2327 : TRIGGER_FIRED_AFTER(trigdata->tg_event) &&
2328 : !(trigdata->tg_event & AFTER_TRIGGER_DEFERRABLE) &&
2329 : !(trigdata->tg_event & AFTER_TRIGGER_INITDEFERRED)) ||
2330 : (trigdata->tg_oldtable == NULL && trigdata->tg_newtable == NULL));
2331 :
2332 21936 : finfo += tgindx;
2333 :
2334 : /*
2335 : * We cache fmgr lookup info, to avoid making the lookup again on each
2336 : * call.
2337 : */
2338 21936 : if (finfo->fn_oid == InvalidOid)
2339 18692 : fmgr_info(trigdata->tg_trigger->tgfoid, finfo);
2340 :
2341 : Assert(finfo->fn_oid == trigdata->tg_trigger->tgfoid);
2342 :
2343 : /*
2344 : * If doing EXPLAIN ANALYZE, start charging time to this trigger.
2345 : */
2346 21936 : if (instr)
2347 0 : InstrStartNode(instr + tgindx);
2348 :
2349 : /*
2350 : * Do the function evaluation in the per-tuple memory context, so that
2351 : * leaked memory will be reclaimed once per tuple. Note in particular that
2352 : * any new tuple created by the trigger function will live till the end of
2353 : * the tuple cycle.
2354 : */
2355 21936 : oldContext = MemoryContextSwitchTo(per_tuple_context);
2356 :
2357 : /*
2358 : * Call the function, passing no arguments but setting a context.
2359 : */
2360 21936 : InitFunctionCallInfoData(*fcinfo, finfo, 0,
2361 : InvalidOid, (Node *) trigdata, NULL);
2362 :
2363 21936 : pgstat_init_function_usage(fcinfo, &fcusage);
2364 :
2365 21936 : MyTriggerDepth++;
2366 21936 : PG_TRY();
2367 : {
2368 21936 : result = FunctionCallInvoke(fcinfo);
2369 : }
2370 1422 : PG_FINALLY();
2371 : {
2372 21936 : MyTriggerDepth--;
2373 : }
2374 21936 : PG_END_TRY();
2375 :
2376 20514 : pgstat_end_function_usage(&fcusage, true);
2377 :
2378 20514 : MemoryContextSwitchTo(oldContext);
2379 :
2380 : /*
2381 : * Trigger protocol allows function to return a null pointer, but NOT to
2382 : * set the isnull result flag.
2383 : */
2384 20514 : if (fcinfo->isnull)
2385 0 : ereport(ERROR,
2386 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2387 : errmsg("trigger function %u returned null value",
2388 : fcinfo->flinfo->fn_oid)));
2389 :
2390 : /*
2391 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
2392 : * one "tuple returned" (really the number of firings).
2393 : */
2394 20514 : if (instr)
2395 0 : InstrStopNode(instr + tgindx, 1);
2396 :
2397 20514 : return (HeapTuple) DatumGetPointer(result);
2398 : }
2399 :
2400 : void
2401 90696 : ExecBSInsertTriggers(EState *estate, ResultRelInfo *relinfo)
2402 : {
2403 : TriggerDesc *trigdesc;
2404 : int i;
2405 90696 : TriggerData LocTriggerData = {0};
2406 :
2407 90696 : trigdesc = relinfo->ri_TrigDesc;
2408 :
2409 90696 : if (trigdesc == NULL)
2410 90484 : return;
2411 7212 : if (!trigdesc->trig_insert_before_statement)
2412 7000 : return;
2413 :
2414 : /* no-op if we already fired BS triggers in this context */
2415 212 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2416 : CMD_INSERT))
2417 0 : return;
2418 :
2419 212 : LocTriggerData.type = T_TriggerData;
2420 212 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2421 : TRIGGER_EVENT_BEFORE;
2422 212 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2423 1832 : for (i = 0; i < trigdesc->numtriggers; i++)
2424 : {
2425 1632 : Trigger *trigger = &trigdesc->triggers[i];
2426 : HeapTuple newtuple;
2427 :
2428 1632 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2429 : TRIGGER_TYPE_STATEMENT,
2430 : TRIGGER_TYPE_BEFORE,
2431 : TRIGGER_TYPE_INSERT))
2432 1408 : continue;
2433 224 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2434 : NULL, NULL, NULL))
2435 30 : continue;
2436 :
2437 194 : LocTriggerData.tg_trigger = trigger;
2438 194 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2439 : i,
2440 : relinfo->ri_TrigFunctions,
2441 : relinfo->ri_TrigInstrument,
2442 194 : GetPerTupleMemoryContext(estate));
2443 :
2444 182 : if (newtuple)
2445 0 : ereport(ERROR,
2446 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2447 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2448 : }
2449 : }
2450 :
2451 : void
2452 88096 : ExecASInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2453 : TransitionCaptureState *transition_capture)
2454 : {
2455 88096 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2456 :
2457 88096 : if (trigdesc && trigdesc->trig_insert_after_statement)
2458 442 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2459 : TRIGGER_EVENT_INSERT,
2460 : false, NULL, NULL, NIL, NULL, transition_capture,
2461 : false);
2462 88096 : }
2463 :
2464 : bool
2465 2346 : ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2466 : TupleTableSlot *slot)
2467 : {
2468 2346 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2469 2346 : HeapTuple newtuple = NULL;
2470 : bool should_free;
2471 2346 : TriggerData LocTriggerData = {0};
2472 : int i;
2473 :
2474 2346 : LocTriggerData.type = T_TriggerData;
2475 2346 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2476 : TRIGGER_EVENT_ROW |
2477 : TRIGGER_EVENT_BEFORE;
2478 2346 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2479 10910 : for (i = 0; i < trigdesc->numtriggers; i++)
2480 : {
2481 8880 : Trigger *trigger = &trigdesc->triggers[i];
2482 : HeapTuple oldtuple;
2483 :
2484 8880 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2485 : TRIGGER_TYPE_ROW,
2486 : TRIGGER_TYPE_BEFORE,
2487 : TRIGGER_TYPE_INSERT))
2488 4244 : continue;
2489 4636 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2490 : NULL, NULL, slot))
2491 62 : continue;
2492 :
2493 4574 : if (!newtuple)
2494 2312 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2495 :
2496 4574 : LocTriggerData.tg_trigslot = slot;
2497 4574 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2498 4574 : LocTriggerData.tg_trigger = trigger;
2499 4574 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2500 : i,
2501 : relinfo->ri_TrigFunctions,
2502 : relinfo->ri_TrigInstrument,
2503 4574 : GetPerTupleMemoryContext(estate));
2504 4500 : if (newtuple == NULL)
2505 : {
2506 218 : if (should_free)
2507 20 : heap_freetuple(oldtuple);
2508 218 : return false; /* "do nothing" */
2509 : }
2510 4282 : else if (newtuple != oldtuple)
2511 : {
2512 744 : newtuple = check_modified_virtual_generated(RelationGetDescr(relinfo->ri_RelationDesc), newtuple);
2513 :
2514 744 : ExecForceStoreHeapTuple(newtuple, slot, false);
2515 :
2516 : /*
2517 : * After a tuple in a partition goes through a trigger, the user
2518 : * could have changed the partition key enough that the tuple no
2519 : * longer fits the partition. Verify that.
2520 : */
2521 744 : if (trigger->tgisclone &&
2522 66 : !ExecPartitionCheck(relinfo, slot, estate, false))
2523 24 : ereport(ERROR,
2524 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2525 : errmsg("moving row to another partition during a BEFORE FOR EACH ROW trigger is not supported"),
2526 : errdetail("Before executing trigger \"%s\", the row was to be in partition \"%s.%s\".",
2527 : trigger->tgname,
2528 : get_namespace_name(RelationGetNamespace(relinfo->ri_RelationDesc)),
2529 : RelationGetRelationName(relinfo->ri_RelationDesc))));
2530 :
2531 720 : if (should_free)
2532 40 : heap_freetuple(oldtuple);
2533 :
2534 : /* signal tuple should be re-fetched if used */
2535 720 : newtuple = NULL;
2536 : }
2537 : }
2538 :
2539 2030 : return true;
2540 : }
2541 :
2542 : void
2543 12622720 : ExecARInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2544 : TupleTableSlot *slot, List *recheckIndexes,
2545 : TransitionCaptureState *transition_capture)
2546 : {
2547 12622720 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2548 :
2549 12622720 : if (relinfo->ri_FdwRoutine && transition_capture &&
2550 8 : transition_capture->tcs_insert_new_table)
2551 : {
2552 : Assert(relinfo->ri_RootResultRelInfo);
2553 8 : ereport(ERROR,
2554 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2555 : errmsg("cannot collect transition tuples from child foreign tables")));
2556 : }
2557 :
2558 12622712 : if ((trigdesc && trigdesc->trig_insert_after_row) ||
2559 60324 : (transition_capture && transition_capture->tcs_insert_new_table))
2560 65694 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2561 : TRIGGER_EVENT_INSERT,
2562 : true, NULL, slot,
2563 : recheckIndexes, NULL,
2564 : transition_capture,
2565 : false);
2566 12622712 : }
2567 :
2568 : bool
2569 180 : ExecIRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2570 : TupleTableSlot *slot)
2571 : {
2572 180 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2573 180 : HeapTuple newtuple = NULL;
2574 : bool should_free;
2575 180 : TriggerData LocTriggerData = {0};
2576 : int i;
2577 :
2578 180 : LocTriggerData.type = T_TriggerData;
2579 180 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2580 : TRIGGER_EVENT_ROW |
2581 : TRIGGER_EVENT_INSTEAD;
2582 180 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2583 546 : for (i = 0; i < trigdesc->numtriggers; i++)
2584 : {
2585 384 : Trigger *trigger = &trigdesc->triggers[i];
2586 : HeapTuple oldtuple;
2587 :
2588 384 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2589 : TRIGGER_TYPE_ROW,
2590 : TRIGGER_TYPE_INSTEAD,
2591 : TRIGGER_TYPE_INSERT))
2592 204 : continue;
2593 180 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2594 : NULL, NULL, slot))
2595 0 : continue;
2596 :
2597 180 : if (!newtuple)
2598 180 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2599 :
2600 180 : LocTriggerData.tg_trigslot = slot;
2601 180 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2602 180 : LocTriggerData.tg_trigger = trigger;
2603 180 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2604 : i,
2605 : relinfo->ri_TrigFunctions,
2606 : relinfo->ri_TrigInstrument,
2607 180 : GetPerTupleMemoryContext(estate));
2608 180 : if (newtuple == NULL)
2609 : {
2610 18 : if (should_free)
2611 18 : heap_freetuple(oldtuple);
2612 18 : return false; /* "do nothing" */
2613 : }
2614 162 : else if (newtuple != oldtuple)
2615 : {
2616 54 : ExecForceStoreHeapTuple(newtuple, slot, false);
2617 :
2618 54 : if (should_free)
2619 54 : heap_freetuple(oldtuple);
2620 :
2621 : /* signal tuple should be re-fetched if used */
2622 54 : newtuple = NULL;
2623 : }
2624 : }
2625 :
2626 162 : return true;
2627 : }
2628 :
2629 : void
2630 12514 : ExecBSDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
2631 : {
2632 : TriggerDesc *trigdesc;
2633 : int i;
2634 12514 : TriggerData LocTriggerData = {0};
2635 :
2636 12514 : trigdesc = relinfo->ri_TrigDesc;
2637 :
2638 12514 : if (trigdesc == NULL)
2639 12436 : return;
2640 1548 : if (!trigdesc->trig_delete_before_statement)
2641 1428 : return;
2642 :
2643 : /* no-op if we already fired BS triggers in this context */
2644 120 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2645 : CMD_DELETE))
2646 42 : return;
2647 :
2648 78 : LocTriggerData.type = T_TriggerData;
2649 78 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2650 : TRIGGER_EVENT_BEFORE;
2651 78 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2652 708 : for (i = 0; i < trigdesc->numtriggers; i++)
2653 : {
2654 630 : Trigger *trigger = &trigdesc->triggers[i];
2655 : HeapTuple newtuple;
2656 :
2657 630 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2658 : TRIGGER_TYPE_STATEMENT,
2659 : TRIGGER_TYPE_BEFORE,
2660 : TRIGGER_TYPE_DELETE))
2661 552 : continue;
2662 78 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2663 : NULL, NULL, NULL))
2664 12 : continue;
2665 :
2666 66 : LocTriggerData.tg_trigger = trigger;
2667 66 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2668 : i,
2669 : relinfo->ri_TrigFunctions,
2670 : relinfo->ri_TrigInstrument,
2671 66 : GetPerTupleMemoryContext(estate));
2672 :
2673 66 : if (newtuple)
2674 0 : ereport(ERROR,
2675 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2676 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2677 : }
2678 : }
2679 :
2680 : void
2681 12368 : ExecASDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2682 : TransitionCaptureState *transition_capture)
2683 : {
2684 12368 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2685 :
2686 12368 : if (trigdesc && trigdesc->trig_delete_after_statement)
2687 236 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2688 : TRIGGER_EVENT_DELETE,
2689 : false, NULL, NULL, NIL, NULL, transition_capture,
2690 : false);
2691 12368 : }
2692 :
2693 : /*
2694 : * Execute BEFORE ROW DELETE triggers.
2695 : *
2696 : * True indicates caller can proceed with the delete. False indicates caller
2697 : * need to suppress the delete and additionally if requested, we need to pass
2698 : * back the concurrently updated tuple if any.
2699 : */
2700 : bool
2701 346 : ExecBRDeleteTriggers(EState *estate, EPQState *epqstate,
2702 : ResultRelInfo *relinfo,
2703 : ItemPointer tupleid,
2704 : HeapTuple fdw_trigtuple,
2705 : TupleTableSlot **epqslot,
2706 : TM_Result *tmresult,
2707 : TM_FailureData *tmfd,
2708 : bool is_merge_delete)
2709 : {
2710 346 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2711 346 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2712 346 : bool result = true;
2713 346 : TriggerData LocTriggerData = {0};
2714 : HeapTuple trigtuple;
2715 346 : bool should_free = false;
2716 : int i;
2717 :
2718 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2719 346 : if (fdw_trigtuple == NULL)
2720 : {
2721 330 : TupleTableSlot *epqslot_candidate = NULL;
2722 :
2723 : /*
2724 : * Get a copy of the on-disk tuple we are planning to delete. In
2725 : * general, if the tuple has been concurrently updated, we should
2726 : * recheck it using EPQ. However, if this is a MERGE DELETE action,
2727 : * we skip this EPQ recheck and leave it to the caller (it must do
2728 : * additional rechecking, and might end up executing a different
2729 : * action entirely).
2730 : */
2731 324 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
2732 330 : LockTupleExclusive, slot, !is_merge_delete,
2733 330 : &epqslot_candidate, tmresult, tmfd))
2734 12 : return false;
2735 :
2736 : /*
2737 : * If the tuple was concurrently updated and the caller of this
2738 : * function requested for the updated tuple, skip the trigger
2739 : * execution.
2740 : */
2741 314 : if (epqslot_candidate != NULL && epqslot != NULL)
2742 : {
2743 2 : *epqslot = epqslot_candidate;
2744 2 : return false;
2745 : }
2746 :
2747 312 : trigtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2748 : }
2749 : else
2750 : {
2751 16 : trigtuple = fdw_trigtuple;
2752 16 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2753 : }
2754 :
2755 328 : LocTriggerData.type = T_TriggerData;
2756 328 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2757 : TRIGGER_EVENT_ROW |
2758 : TRIGGER_EVENT_BEFORE;
2759 328 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2760 1228 : for (i = 0; i < trigdesc->numtriggers; i++)
2761 : {
2762 : HeapTuple newtuple;
2763 962 : Trigger *trigger = &trigdesc->triggers[i];
2764 :
2765 962 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2766 : TRIGGER_TYPE_ROW,
2767 : TRIGGER_TYPE_BEFORE,
2768 : TRIGGER_TYPE_DELETE))
2769 628 : continue;
2770 334 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2771 : NULL, slot, NULL))
2772 14 : continue;
2773 :
2774 320 : LocTriggerData.tg_trigslot = slot;
2775 320 : LocTriggerData.tg_trigtuple = trigtuple;
2776 320 : LocTriggerData.tg_trigger = trigger;
2777 320 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2778 : i,
2779 : relinfo->ri_TrigFunctions,
2780 : relinfo->ri_TrigInstrument,
2781 320 : GetPerTupleMemoryContext(estate));
2782 310 : if (newtuple == NULL)
2783 : {
2784 52 : result = false; /* tell caller to suppress delete */
2785 52 : break;
2786 : }
2787 258 : if (newtuple != trigtuple)
2788 56 : heap_freetuple(newtuple);
2789 : }
2790 318 : if (should_free)
2791 0 : heap_freetuple(trigtuple);
2792 :
2793 318 : return result;
2794 : }
2795 :
2796 : /*
2797 : * Note: is_crosspart_update must be true if the DELETE is being performed
2798 : * as part of a cross-partition update.
2799 : */
2800 : void
2801 1731838 : ExecARDeleteTriggers(EState *estate,
2802 : ResultRelInfo *relinfo,
2803 : ItemPointer tupleid,
2804 : HeapTuple fdw_trigtuple,
2805 : TransitionCaptureState *transition_capture,
2806 : bool is_crosspart_update)
2807 : {
2808 1731838 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2809 :
2810 1731838 : if (relinfo->ri_FdwRoutine && transition_capture &&
2811 4 : transition_capture->tcs_delete_old_table)
2812 : {
2813 : Assert(relinfo->ri_RootResultRelInfo);
2814 4 : ereport(ERROR,
2815 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2816 : errmsg("cannot collect transition tuples from child foreign tables")));
2817 : }
2818 :
2819 1731834 : if ((trigdesc && trigdesc->trig_delete_after_row) ||
2820 5016 : (transition_capture && transition_capture->tcs_delete_old_table))
2821 : {
2822 6204 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2823 :
2824 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2825 6204 : if (fdw_trigtuple == NULL)
2826 6188 : GetTupleForTrigger(estate,
2827 : NULL,
2828 : relinfo,
2829 : tupleid,
2830 : LockTupleExclusive,
2831 : slot,
2832 : false,
2833 : NULL,
2834 : NULL,
2835 : NULL);
2836 : else
2837 16 : ExecForceStoreHeapTuple(fdw_trigtuple, slot, false);
2838 :
2839 6204 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2840 : TRIGGER_EVENT_DELETE,
2841 : true, slot, NULL, NIL, NULL,
2842 : transition_capture,
2843 : is_crosspart_update);
2844 : }
2845 1731834 : }
2846 :
2847 : bool
2848 60 : ExecIRDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2849 : HeapTuple trigtuple)
2850 : {
2851 60 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2852 60 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2853 60 : TriggerData LocTriggerData = {0};
2854 : int i;
2855 :
2856 60 : LocTriggerData.type = T_TriggerData;
2857 60 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2858 : TRIGGER_EVENT_ROW |
2859 : TRIGGER_EVENT_INSTEAD;
2860 60 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2861 :
2862 60 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2863 :
2864 354 : for (i = 0; i < trigdesc->numtriggers; i++)
2865 : {
2866 : HeapTuple rettuple;
2867 300 : Trigger *trigger = &trigdesc->triggers[i];
2868 :
2869 300 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2870 : TRIGGER_TYPE_ROW,
2871 : TRIGGER_TYPE_INSTEAD,
2872 : TRIGGER_TYPE_DELETE))
2873 240 : continue;
2874 60 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2875 : NULL, slot, NULL))
2876 0 : continue;
2877 :
2878 60 : LocTriggerData.tg_trigslot = slot;
2879 60 : LocTriggerData.tg_trigtuple = trigtuple;
2880 60 : LocTriggerData.tg_trigger = trigger;
2881 60 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
2882 : i,
2883 : relinfo->ri_TrigFunctions,
2884 : relinfo->ri_TrigInstrument,
2885 60 : GetPerTupleMemoryContext(estate));
2886 60 : if (rettuple == NULL)
2887 6 : return false; /* Delete was suppressed */
2888 54 : if (rettuple != trigtuple)
2889 0 : heap_freetuple(rettuple);
2890 : }
2891 54 : return true;
2892 : }
2893 :
2894 : void
2895 15556 : ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
2896 : {
2897 : TriggerDesc *trigdesc;
2898 : int i;
2899 15556 : TriggerData LocTriggerData = {0};
2900 : Bitmapset *updatedCols;
2901 :
2902 15556 : trigdesc = relinfo->ri_TrigDesc;
2903 :
2904 15556 : if (trigdesc == NULL)
2905 15378 : return;
2906 4150 : if (!trigdesc->trig_update_before_statement)
2907 3972 : return;
2908 :
2909 : /* no-op if we already fired BS triggers in this context */
2910 178 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2911 : CMD_UPDATE))
2912 0 : return;
2913 :
2914 : /* statement-level triggers operate on the parent table */
2915 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2916 :
2917 178 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
2918 :
2919 178 : LocTriggerData.type = T_TriggerData;
2920 178 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
2921 : TRIGGER_EVENT_BEFORE;
2922 178 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2923 178 : LocTriggerData.tg_updatedcols = updatedCols;
2924 1600 : for (i = 0; i < trigdesc->numtriggers; i++)
2925 : {
2926 1422 : Trigger *trigger = &trigdesc->triggers[i];
2927 : HeapTuple newtuple;
2928 :
2929 1422 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2930 : TRIGGER_TYPE_STATEMENT,
2931 : TRIGGER_TYPE_BEFORE,
2932 : TRIGGER_TYPE_UPDATE))
2933 1244 : continue;
2934 178 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2935 : updatedCols, NULL, NULL))
2936 6 : continue;
2937 :
2938 172 : LocTriggerData.tg_trigger = trigger;
2939 172 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2940 : i,
2941 : relinfo->ri_TrigFunctions,
2942 : relinfo->ri_TrigInstrument,
2943 172 : GetPerTupleMemoryContext(estate));
2944 :
2945 172 : if (newtuple)
2946 0 : ereport(ERROR,
2947 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2948 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2949 : }
2950 : }
2951 :
2952 : void
2953 14636 : ExecASUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
2954 : TransitionCaptureState *transition_capture)
2955 : {
2956 14636 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2957 :
2958 : /* statement-level triggers operate on the parent table */
2959 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2960 :
2961 14636 : if (trigdesc && trigdesc->trig_update_after_statement)
2962 408 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2963 : TRIGGER_EVENT_UPDATE,
2964 : false, NULL, NULL, NIL,
2965 : ExecGetAllUpdatedCols(relinfo, estate),
2966 : transition_capture,
2967 : false);
2968 14636 : }
2969 :
2970 : bool
2971 2574 : ExecBRUpdateTriggers(EState *estate, EPQState *epqstate,
2972 : ResultRelInfo *relinfo,
2973 : ItemPointer tupleid,
2974 : HeapTuple fdw_trigtuple,
2975 : TupleTableSlot *newslot,
2976 : TM_Result *tmresult,
2977 : TM_FailureData *tmfd,
2978 : bool is_merge_update)
2979 : {
2980 2574 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2981 2574 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
2982 2574 : HeapTuple newtuple = NULL;
2983 : HeapTuple trigtuple;
2984 2574 : bool should_free_trig = false;
2985 2574 : bool should_free_new = false;
2986 2574 : TriggerData LocTriggerData = {0};
2987 : int i;
2988 : Bitmapset *updatedCols;
2989 : LockTupleMode lockmode;
2990 :
2991 : /* Determine lock mode to use */
2992 2574 : lockmode = ExecUpdateLockMode(estate, relinfo);
2993 :
2994 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2995 2574 : if (fdw_trigtuple == NULL)
2996 : {
2997 2536 : TupleTableSlot *epqslot_candidate = NULL;
2998 :
2999 : /*
3000 : * Get a copy of the on-disk tuple we are planning to update. In
3001 : * general, if the tuple has been concurrently updated, we should
3002 : * recheck it using EPQ. However, if this is a MERGE UPDATE action,
3003 : * we skip this EPQ recheck and leave it to the caller (it must do
3004 : * additional rechecking, and might end up executing a different
3005 : * action entirely).
3006 : */
3007 2528 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
3008 2536 : lockmode, oldslot, !is_merge_update,
3009 2536 : &epqslot_candidate, tmresult, tmfd))
3010 24 : return false; /* cancel the update action */
3011 :
3012 : /*
3013 : * In READ COMMITTED isolation level it's possible that target tuple
3014 : * was changed due to concurrent update. In that case we have a raw
3015 : * subplan output tuple in epqslot_candidate, and need to form a new
3016 : * insertable tuple using ExecGetUpdateNewTuple to replace the one we
3017 : * received in newslot. Neither we nor our callers have any further
3018 : * interest in the passed-in tuple, so it's okay to overwrite newslot
3019 : * with the newer data.
3020 : */
3021 2504 : if (epqslot_candidate != NULL)
3022 : {
3023 : TupleTableSlot *epqslot_clean;
3024 :
3025 6 : epqslot_clean = ExecGetUpdateNewTuple(relinfo, epqslot_candidate,
3026 : oldslot);
3027 :
3028 : /*
3029 : * Typically, the caller's newslot was also generated by
3030 : * ExecGetUpdateNewTuple, so that epqslot_clean will be the same
3031 : * slot and copying is not needed. But do the right thing if it
3032 : * isn't.
3033 : */
3034 6 : if (unlikely(newslot != epqslot_clean))
3035 0 : ExecCopySlot(newslot, epqslot_clean);
3036 :
3037 : /*
3038 : * At this point newslot contains a virtual tuple that may
3039 : * reference some fields of oldslot's tuple in some disk buffer.
3040 : * If that tuple is in a different page than the original target
3041 : * tuple, then our only pin on that buffer is oldslot's, and we're
3042 : * about to release it. Hence we'd better materialize newslot to
3043 : * ensure it doesn't contain references into an unpinned buffer.
3044 : * (We'd materialize it below anyway, but too late for safety.)
3045 : */
3046 6 : ExecMaterializeSlot(newslot);
3047 : }
3048 :
3049 : /*
3050 : * Here we convert oldslot to a materialized slot holding trigtuple.
3051 : * Neither slot passed to the triggers will hold any buffer pin.
3052 : */
3053 2504 : trigtuple = ExecFetchSlotHeapTuple(oldslot, true, &should_free_trig);
3054 : }
3055 : else
3056 : {
3057 : /* Put the FDW-supplied tuple into oldslot to unify the cases */
3058 38 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3059 38 : trigtuple = fdw_trigtuple;
3060 : }
3061 :
3062 2542 : LocTriggerData.type = T_TriggerData;
3063 2542 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3064 : TRIGGER_EVENT_ROW |
3065 : TRIGGER_EVENT_BEFORE;
3066 2542 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3067 2542 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
3068 2542 : LocTriggerData.tg_updatedcols = updatedCols;
3069 11458 : for (i = 0; i < trigdesc->numtriggers; i++)
3070 : {
3071 9064 : Trigger *trigger = &trigdesc->triggers[i];
3072 : HeapTuple oldtuple;
3073 :
3074 9064 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3075 : TRIGGER_TYPE_ROW,
3076 : TRIGGER_TYPE_BEFORE,
3077 : TRIGGER_TYPE_UPDATE))
3078 4462 : continue;
3079 4602 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3080 : updatedCols, oldslot, newslot))
3081 98 : continue;
3082 :
3083 4504 : if (!newtuple)
3084 2530 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free_new);
3085 :
3086 4504 : LocTriggerData.tg_trigslot = oldslot;
3087 4504 : LocTriggerData.tg_trigtuple = trigtuple;
3088 4504 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3089 4504 : LocTriggerData.tg_newslot = newslot;
3090 4504 : LocTriggerData.tg_trigger = trigger;
3091 4504 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3092 : i,
3093 : relinfo->ri_TrigFunctions,
3094 : relinfo->ri_TrigInstrument,
3095 4504 : GetPerTupleMemoryContext(estate));
3096 :
3097 4488 : if (newtuple == NULL)
3098 : {
3099 132 : if (should_free_trig)
3100 0 : heap_freetuple(trigtuple);
3101 132 : if (should_free_new)
3102 4 : heap_freetuple(oldtuple);
3103 132 : return false; /* "do nothing" */
3104 : }
3105 4356 : else if (newtuple != oldtuple)
3106 : {
3107 1304 : newtuple = check_modified_virtual_generated(RelationGetDescr(relinfo->ri_RelationDesc), newtuple);
3108 :
3109 1304 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3110 :
3111 : /*
3112 : * If the tuple returned by the trigger / being stored, is the old
3113 : * row version, and the heap tuple passed to the trigger was
3114 : * allocated locally, materialize the slot. Otherwise we might
3115 : * free it while still referenced by the slot.
3116 : */
3117 1304 : if (should_free_trig && newtuple == trigtuple)
3118 0 : ExecMaterializeSlot(newslot);
3119 :
3120 1304 : if (should_free_new)
3121 2 : heap_freetuple(oldtuple);
3122 :
3123 : /* signal tuple should be re-fetched if used */
3124 1304 : newtuple = NULL;
3125 : }
3126 : }
3127 2394 : if (should_free_trig)
3128 0 : heap_freetuple(trigtuple);
3129 :
3130 2394 : return true;
3131 : }
3132 :
3133 : /*
3134 : * Note: 'src_partinfo' and 'dst_partinfo', when non-NULL, refer to the source
3135 : * and destination partitions, respectively, of a cross-partition update of
3136 : * the root partitioned table mentioned in the query, given by 'relinfo'.
3137 : * 'tupleid' in that case refers to the ctid of the "old" tuple in the source
3138 : * partition, and 'newslot' contains the "new" tuple in the destination
3139 : * partition. This interface allows to support the requirements of
3140 : * ExecCrossPartitionUpdateForeignKey(); is_crosspart_update must be true in
3141 : * that case.
3142 : */
3143 : void
3144 387472 : ExecARUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3145 : ResultRelInfo *src_partinfo,
3146 : ResultRelInfo *dst_partinfo,
3147 : ItemPointer tupleid,
3148 : HeapTuple fdw_trigtuple,
3149 : TupleTableSlot *newslot,
3150 : List *recheckIndexes,
3151 : TransitionCaptureState *transition_capture,
3152 : bool is_crosspart_update)
3153 : {
3154 387472 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3155 :
3156 387472 : if (relinfo->ri_FdwRoutine && transition_capture &&
3157 4 : (transition_capture->tcs_update_old_table ||
3158 0 : transition_capture->tcs_update_new_table))
3159 : {
3160 : Assert(relinfo->ri_RootResultRelInfo);
3161 4 : ereport(ERROR,
3162 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3163 : errmsg("cannot collect transition tuples from child foreign tables")));
3164 : }
3165 :
3166 387468 : if ((trigdesc && trigdesc->trig_update_after_row) ||
3167 372 : (transition_capture &&
3168 372 : (transition_capture->tcs_update_old_table ||
3169 18 : transition_capture->tcs_update_new_table)))
3170 : {
3171 : /*
3172 : * Note: if the UPDATE is converted into a DELETE+INSERT as part of
3173 : * update-partition-key operation, then this function is also called
3174 : * separately for DELETE and INSERT to capture transition table rows.
3175 : * In such case, either old tuple or new tuple can be NULL.
3176 : */
3177 : TupleTableSlot *oldslot;
3178 : ResultRelInfo *tupsrc;
3179 :
3180 : Assert((src_partinfo != NULL && dst_partinfo != NULL) ||
3181 : !is_crosspart_update);
3182 :
3183 3746 : tupsrc = src_partinfo ? src_partinfo : relinfo;
3184 3746 : oldslot = ExecGetTriggerOldSlot(estate, tupsrc);
3185 :
3186 3746 : if (fdw_trigtuple == NULL && ItemPointerIsValid(tupleid))
3187 3678 : GetTupleForTrigger(estate,
3188 : NULL,
3189 : tupsrc,
3190 : tupleid,
3191 : LockTupleExclusive,
3192 : oldslot,
3193 : false,
3194 : NULL,
3195 : NULL,
3196 : NULL);
3197 68 : else if (fdw_trigtuple != NULL)
3198 20 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3199 : else
3200 48 : ExecClearTuple(oldslot);
3201 :
3202 3746 : AfterTriggerSaveEvent(estate, relinfo,
3203 : src_partinfo, dst_partinfo,
3204 : TRIGGER_EVENT_UPDATE,
3205 : true,
3206 : oldslot, newslot, recheckIndexes,
3207 : ExecGetAllUpdatedCols(relinfo, estate),
3208 : transition_capture,
3209 : is_crosspart_update);
3210 : }
3211 387468 : }
3212 :
3213 : bool
3214 204 : ExecIRUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3215 : HeapTuple trigtuple, TupleTableSlot *newslot)
3216 : {
3217 204 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3218 204 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
3219 204 : HeapTuple newtuple = NULL;
3220 : bool should_free;
3221 204 : TriggerData LocTriggerData = {0};
3222 : int i;
3223 :
3224 204 : LocTriggerData.type = T_TriggerData;
3225 204 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3226 : TRIGGER_EVENT_ROW |
3227 : TRIGGER_EVENT_INSTEAD;
3228 204 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3229 :
3230 204 : ExecForceStoreHeapTuple(trigtuple, oldslot, false);
3231 :
3232 756 : for (i = 0; i < trigdesc->numtriggers; i++)
3233 : {
3234 582 : Trigger *trigger = &trigdesc->triggers[i];
3235 : HeapTuple oldtuple;
3236 :
3237 582 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3238 : TRIGGER_TYPE_ROW,
3239 : TRIGGER_TYPE_INSTEAD,
3240 : TRIGGER_TYPE_UPDATE))
3241 378 : continue;
3242 204 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3243 : NULL, oldslot, newslot))
3244 0 : continue;
3245 :
3246 204 : if (!newtuple)
3247 204 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free);
3248 :
3249 204 : LocTriggerData.tg_trigslot = oldslot;
3250 204 : LocTriggerData.tg_trigtuple = trigtuple;
3251 204 : LocTriggerData.tg_newslot = newslot;
3252 204 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3253 :
3254 204 : LocTriggerData.tg_trigger = trigger;
3255 204 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3256 : i,
3257 : relinfo->ri_TrigFunctions,
3258 : relinfo->ri_TrigInstrument,
3259 204 : GetPerTupleMemoryContext(estate));
3260 192 : if (newtuple == NULL)
3261 : {
3262 18 : return false; /* "do nothing" */
3263 : }
3264 174 : else if (newtuple != oldtuple)
3265 : {
3266 138 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3267 :
3268 138 : if (should_free)
3269 138 : heap_freetuple(oldtuple);
3270 :
3271 : /* signal tuple should be re-fetched if used */
3272 138 : newtuple = NULL;
3273 : }
3274 : }
3275 :
3276 174 : return true;
3277 : }
3278 :
3279 : void
3280 3756 : ExecBSTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3281 : {
3282 : TriggerDesc *trigdesc;
3283 : int i;
3284 3756 : TriggerData LocTriggerData = {0};
3285 :
3286 3756 : trigdesc = relinfo->ri_TrigDesc;
3287 :
3288 3756 : if (trigdesc == NULL)
3289 3744 : return;
3290 730 : if (!trigdesc->trig_truncate_before_statement)
3291 718 : return;
3292 :
3293 12 : LocTriggerData.type = T_TriggerData;
3294 12 : LocTriggerData.tg_event = TRIGGER_EVENT_TRUNCATE |
3295 : TRIGGER_EVENT_BEFORE;
3296 12 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3297 :
3298 36 : for (i = 0; i < trigdesc->numtriggers; i++)
3299 : {
3300 24 : Trigger *trigger = &trigdesc->triggers[i];
3301 : HeapTuple newtuple;
3302 :
3303 24 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3304 : TRIGGER_TYPE_STATEMENT,
3305 : TRIGGER_TYPE_BEFORE,
3306 : TRIGGER_TYPE_TRUNCATE))
3307 12 : continue;
3308 12 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3309 : NULL, NULL, NULL))
3310 0 : continue;
3311 :
3312 12 : LocTriggerData.tg_trigger = trigger;
3313 12 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3314 : i,
3315 : relinfo->ri_TrigFunctions,
3316 : relinfo->ri_TrigInstrument,
3317 12 : GetPerTupleMemoryContext(estate));
3318 :
3319 12 : if (newtuple)
3320 0 : ereport(ERROR,
3321 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
3322 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
3323 : }
3324 : }
3325 :
3326 : void
3327 3748 : ExecASTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3328 : {
3329 3748 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3330 :
3331 3748 : if (trigdesc && trigdesc->trig_truncate_after_statement)
3332 8 : AfterTriggerSaveEvent(estate, relinfo,
3333 : NULL, NULL,
3334 : TRIGGER_EVENT_TRUNCATE,
3335 : false, NULL, NULL, NIL, NULL, NULL,
3336 : false);
3337 3748 : }
3338 :
3339 :
3340 : /*
3341 : * Fetch tuple into "oldslot", dealing with locking and EPQ if necessary
3342 : */
3343 : static bool
3344 12732 : GetTupleForTrigger(EState *estate,
3345 : EPQState *epqstate,
3346 : ResultRelInfo *relinfo,
3347 : ItemPointer tid,
3348 : LockTupleMode lockmode,
3349 : TupleTableSlot *oldslot,
3350 : bool do_epq_recheck,
3351 : TupleTableSlot **epqslot,
3352 : TM_Result *tmresultp,
3353 : TM_FailureData *tmfdp)
3354 : {
3355 12732 : Relation relation = relinfo->ri_RelationDesc;
3356 :
3357 12732 : if (epqslot != NULL)
3358 : {
3359 : TM_Result test;
3360 : TM_FailureData tmfd;
3361 2866 : int lockflags = 0;
3362 :
3363 2866 : *epqslot = NULL;
3364 :
3365 : /* caller must pass an epqstate if EvalPlanQual is possible */
3366 : Assert(epqstate != NULL);
3367 :
3368 : /*
3369 : * lock tuple for update
3370 : */
3371 2866 : if (!IsolationUsesXactSnapshot())
3372 2002 : lockflags |= TUPLE_LOCK_FLAG_FIND_LAST_VERSION;
3373 2866 : test = table_tuple_lock(relation, tid, estate->es_snapshot, oldslot,
3374 : estate->es_output_cid,
3375 : lockmode, LockWaitBlock,
3376 : lockflags,
3377 : &tmfd);
3378 :
3379 : /* Let the caller know about the status of this operation */
3380 2862 : if (tmresultp)
3381 220 : *tmresultp = test;
3382 2862 : if (tmfdp)
3383 2856 : *tmfdp = tmfd;
3384 :
3385 2862 : switch (test)
3386 : {
3387 6 : case TM_SelfModified:
3388 :
3389 : /*
3390 : * The target tuple was already updated or deleted by the
3391 : * current command, or by a later command in the current
3392 : * transaction. We ignore the tuple in the former case, and
3393 : * throw error in the latter case, for the same reasons
3394 : * enumerated in ExecUpdate and ExecDelete in
3395 : * nodeModifyTable.c.
3396 : */
3397 6 : if (tmfd.cmax != estate->es_output_cid)
3398 6 : ereport(ERROR,
3399 : (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
3400 : errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
3401 : errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
3402 :
3403 : /* treat it as deleted; do not process */
3404 34 : return false;
3405 :
3406 2838 : case TM_Ok:
3407 2838 : if (tmfd.traversed)
3408 : {
3409 : /*
3410 : * Recheck the tuple using EPQ, if requested. Otherwise,
3411 : * just return that it was concurrently updated.
3412 : */
3413 28 : if (do_epq_recheck)
3414 : {
3415 12 : *epqslot = EvalPlanQual(epqstate,
3416 : relation,
3417 : relinfo->ri_RangeTableIndex,
3418 : oldslot);
3419 :
3420 : /*
3421 : * If PlanQual failed for updated tuple - we must not
3422 : * process this tuple!
3423 : */
3424 12 : if (TupIsNull(*epqslot))
3425 : {
3426 4 : *epqslot = NULL;
3427 4 : return false;
3428 : }
3429 : }
3430 : else
3431 : {
3432 16 : if (tmresultp)
3433 16 : *tmresultp = TM_Updated;
3434 16 : return false;
3435 : }
3436 : }
3437 2818 : break;
3438 :
3439 2 : case TM_Updated:
3440 2 : if (IsolationUsesXactSnapshot())
3441 2 : ereport(ERROR,
3442 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3443 : errmsg("could not serialize access due to concurrent update")));
3444 0 : elog(ERROR, "unexpected table_tuple_lock status: %u", test);
3445 : break;
3446 :
3447 16 : case TM_Deleted:
3448 16 : if (IsolationUsesXactSnapshot())
3449 2 : ereport(ERROR,
3450 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3451 : errmsg("could not serialize access due to concurrent delete")));
3452 : /* tuple was deleted */
3453 14 : return false;
3454 :
3455 0 : case TM_Invisible:
3456 0 : elog(ERROR, "attempted to lock invisible tuple");
3457 : break;
3458 :
3459 0 : default:
3460 0 : elog(ERROR, "unrecognized table_tuple_lock status: %u", test);
3461 : return false; /* keep compiler quiet */
3462 : }
3463 : }
3464 : else
3465 : {
3466 : /*
3467 : * We expect the tuple to be present, thus very simple error handling
3468 : * suffices.
3469 : */
3470 9866 : if (!table_tuple_fetch_row_version(relation, tid, SnapshotAny,
3471 : oldslot))
3472 0 : elog(ERROR, "failed to fetch tuple for trigger");
3473 : }
3474 :
3475 12684 : return true;
3476 : }
3477 :
3478 : /*
3479 : * Is trigger enabled to fire?
3480 : */
3481 : static bool
3482 24562 : TriggerEnabled(EState *estate, ResultRelInfo *relinfo,
3483 : Trigger *trigger, TriggerEvent event,
3484 : Bitmapset *modifiedCols,
3485 : TupleTableSlot *oldslot, TupleTableSlot *newslot)
3486 : {
3487 : /* Check replication-role-dependent enable state */
3488 24562 : if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
3489 : {
3490 128 : if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
3491 80 : trigger->tgenabled == TRIGGER_DISABLED)
3492 84 : return false;
3493 : }
3494 : else /* ORIGIN or LOCAL role */
3495 : {
3496 24434 : if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
3497 24432 : trigger->tgenabled == TRIGGER_DISABLED)
3498 158 : return false;
3499 : }
3500 :
3501 : /*
3502 : * Check for column-specific trigger (only possible for UPDATE, and in
3503 : * fact we *must* ignore tgattr for other event types)
3504 : */
3505 24320 : if (trigger->tgnattr > 0 && TRIGGER_FIRED_BY_UPDATE(event))
3506 : {
3507 : int i;
3508 : bool modified;
3509 :
3510 430 : modified = false;
3511 562 : for (i = 0; i < trigger->tgnattr; i++)
3512 : {
3513 478 : if (bms_is_member(trigger->tgattr[i] - FirstLowInvalidHeapAttributeNumber,
3514 : modifiedCols))
3515 : {
3516 346 : modified = true;
3517 346 : break;
3518 : }
3519 : }
3520 430 : if (!modified)
3521 84 : return false;
3522 : }
3523 :
3524 : /* Check for WHEN clause */
3525 24236 : if (trigger->tgqual)
3526 : {
3527 : ExprState **predicate;
3528 : ExprContext *econtext;
3529 : MemoryContext oldContext;
3530 : int i;
3531 :
3532 : Assert(estate != NULL);
3533 :
3534 : /*
3535 : * trigger is an element of relinfo->ri_TrigDesc->triggers[]; find the
3536 : * matching element of relinfo->ri_TrigWhenExprs[]
3537 : */
3538 570 : i = trigger - relinfo->ri_TrigDesc->triggers;
3539 570 : predicate = &relinfo->ri_TrigWhenExprs[i];
3540 :
3541 : /*
3542 : * If first time through for this WHEN expression, build expression
3543 : * nodetrees for it. Keep them in the per-query memory context so
3544 : * they'll survive throughout the query.
3545 : */
3546 570 : if (*predicate == NULL)
3547 : {
3548 : Node *tgqual;
3549 :
3550 302 : oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
3551 302 : tgqual = stringToNode(trigger->tgqual);
3552 302 : tgqual = expand_generated_columns_in_expr(tgqual, relinfo->ri_RelationDesc, PRS2_OLD_VARNO);
3553 302 : tgqual = expand_generated_columns_in_expr(tgqual, relinfo->ri_RelationDesc, PRS2_NEW_VARNO);
3554 : /* Change references to OLD and NEW to INNER_VAR and OUTER_VAR */
3555 302 : ChangeVarNodes(tgqual, PRS2_OLD_VARNO, INNER_VAR, 0);
3556 302 : ChangeVarNodes(tgqual, PRS2_NEW_VARNO, OUTER_VAR, 0);
3557 : /* ExecPrepareQual wants implicit-AND form */
3558 302 : tgqual = (Node *) make_ands_implicit((Expr *) tgqual);
3559 302 : *predicate = ExecPrepareQual((List *) tgqual, estate);
3560 302 : MemoryContextSwitchTo(oldContext);
3561 : }
3562 :
3563 : /*
3564 : * We will use the EState's per-tuple context for evaluating WHEN
3565 : * expressions (creating it if it's not already there).
3566 : */
3567 570 : econtext = GetPerTupleExprContext(estate);
3568 :
3569 : /*
3570 : * Finally evaluate the expression, making the old and/or new tuples
3571 : * available as INNER_VAR/OUTER_VAR respectively.
3572 : */
3573 570 : econtext->ecxt_innertuple = oldslot;
3574 570 : econtext->ecxt_outertuple = newslot;
3575 570 : if (!ExecQual(*predicate, econtext))
3576 318 : return false;
3577 : }
3578 :
3579 23918 : return true;
3580 : }
3581 :
3582 :
3583 : /* ----------
3584 : * After-trigger stuff
3585 : *
3586 : * The AfterTriggersData struct holds data about pending AFTER trigger events
3587 : * during the current transaction tree. (BEFORE triggers are fired
3588 : * immediately so we don't need any persistent state about them.) The struct
3589 : * and most of its subsidiary data are kept in TopTransactionContext; however
3590 : * some data that can be discarded sooner appears in the CurTransactionContext
3591 : * of the relevant subtransaction. Also, the individual event records are
3592 : * kept in a separate sub-context of TopTransactionContext. This is done
3593 : * mainly so that it's easy to tell from a memory context dump how much space
3594 : * is being eaten by trigger events.
3595 : *
3596 : * Because the list of pending events can grow large, we go to some
3597 : * considerable effort to minimize per-event memory consumption. The event
3598 : * records are grouped into chunks and common data for similar events in the
3599 : * same chunk is only stored once.
3600 : *
3601 : * XXX We need to be able to save the per-event data in a file if it grows too
3602 : * large.
3603 : * ----------
3604 : */
3605 :
3606 : /* Per-trigger SET CONSTRAINT status */
3607 : typedef struct SetConstraintTriggerData
3608 : {
3609 : Oid sct_tgoid;
3610 : bool sct_tgisdeferred;
3611 : } SetConstraintTriggerData;
3612 :
3613 : typedef struct SetConstraintTriggerData *SetConstraintTrigger;
3614 :
3615 : /*
3616 : * SET CONSTRAINT intra-transaction status.
3617 : *
3618 : * We make this a single palloc'd object so it can be copied and freed easily.
3619 : *
3620 : * all_isset and all_isdeferred are used to keep track
3621 : * of SET CONSTRAINTS ALL {DEFERRED, IMMEDIATE}.
3622 : *
3623 : * trigstates[] stores per-trigger tgisdeferred settings.
3624 : */
3625 : typedef struct SetConstraintStateData
3626 : {
3627 : bool all_isset;
3628 : bool all_isdeferred;
3629 : int numstates; /* number of trigstates[] entries in use */
3630 : int numalloc; /* allocated size of trigstates[] */
3631 : SetConstraintTriggerData trigstates[FLEXIBLE_ARRAY_MEMBER];
3632 : } SetConstraintStateData;
3633 :
3634 : typedef SetConstraintStateData *SetConstraintState;
3635 :
3636 :
3637 : /*
3638 : * Per-trigger-event data
3639 : *
3640 : * The actual per-event data, AfterTriggerEventData, includes DONE/IN_PROGRESS
3641 : * status bits, up to two tuple CTIDs, and optionally two OIDs of partitions.
3642 : * Each event record also has an associated AfterTriggerSharedData that is
3643 : * shared across all instances of similar events within a "chunk".
3644 : *
3645 : * For row-level triggers, we arrange not to waste storage on unneeded ctid
3646 : * fields. Updates of regular tables use two; inserts and deletes of regular
3647 : * tables use one; foreign tables always use zero and save the tuple(s) to a
3648 : * tuplestore. AFTER_TRIGGER_FDW_FETCH directs AfterTriggerExecute() to
3649 : * retrieve a fresh tuple or pair of tuples from that tuplestore, while
3650 : * AFTER_TRIGGER_FDW_REUSE directs it to use the most-recently-retrieved
3651 : * tuple(s). This permits storing tuples once regardless of the number of
3652 : * row-level triggers on a foreign table.
3653 : *
3654 : * When updates on partitioned tables cause rows to move between partitions,
3655 : * the OIDs of both partitions are stored too, so that the tuples can be
3656 : * fetched; such entries are marked AFTER_TRIGGER_CP_UPDATE (for "cross-
3657 : * partition update").
3658 : *
3659 : * Note that we need triggers on foreign tables to be fired in exactly the
3660 : * order they were queued, so that the tuples come out of the tuplestore in
3661 : * the right order. To ensure that, we forbid deferrable (constraint)
3662 : * triggers on foreign tables. This also ensures that such triggers do not
3663 : * get deferred into outer trigger query levels, meaning that it's okay to
3664 : * destroy the tuplestore at the end of the query level.
3665 : *
3666 : * Statement-level triggers always bear AFTER_TRIGGER_1CTID, though they
3667 : * require no ctid field. We lack the flag bit space to neatly represent that
3668 : * distinct case, and it seems unlikely to be worth much trouble.
3669 : *
3670 : * Note: ats_firing_id is initially zero and is set to something else when
3671 : * AFTER_TRIGGER_IN_PROGRESS is set. It indicates which trigger firing
3672 : * cycle the trigger will be fired in (or was fired in, if DONE is set).
3673 : * Although this is mutable state, we can keep it in AfterTriggerSharedData
3674 : * because all instances of the same type of event in a given event list will
3675 : * be fired at the same time, if they were queued between the same firing
3676 : * cycles. So we need only ensure that ats_firing_id is zero when attaching
3677 : * a new event to an existing AfterTriggerSharedData record.
3678 : */
3679 : typedef uint32 TriggerFlags;
3680 :
3681 : #define AFTER_TRIGGER_OFFSET 0x07FFFFFF /* must be low-order bits */
3682 : #define AFTER_TRIGGER_DONE 0x80000000
3683 : #define AFTER_TRIGGER_IN_PROGRESS 0x40000000
3684 : /* bits describing the size and tuple sources of this event */
3685 : #define AFTER_TRIGGER_FDW_REUSE 0x00000000
3686 : #define AFTER_TRIGGER_FDW_FETCH 0x20000000
3687 : #define AFTER_TRIGGER_1CTID 0x10000000
3688 : #define AFTER_TRIGGER_2CTID 0x30000000
3689 : #define AFTER_TRIGGER_CP_UPDATE 0x08000000
3690 : #define AFTER_TRIGGER_TUP_BITS 0x38000000
3691 : typedef struct AfterTriggerSharedData *AfterTriggerShared;
3692 :
3693 : typedef struct AfterTriggerSharedData
3694 : {
3695 : TriggerEvent ats_event; /* event type indicator, see trigger.h */
3696 : Oid ats_tgoid; /* the trigger's ID */
3697 : Oid ats_relid; /* the relation it's on */
3698 : Oid ats_rolid; /* role to execute the trigger */
3699 : CommandId ats_firing_id; /* ID for firing cycle */
3700 : struct AfterTriggersTableData *ats_table; /* transition table access */
3701 : Bitmapset *ats_modifiedcols; /* modified columns */
3702 : } AfterTriggerSharedData;
3703 :
3704 : typedef struct AfterTriggerEventData *AfterTriggerEvent;
3705 :
3706 : typedef struct AfterTriggerEventData
3707 : {
3708 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3709 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3710 : ItemPointerData ate_ctid2; /* new updated tuple */
3711 :
3712 : /*
3713 : * During a cross-partition update of a partitioned table, we also store
3714 : * the OIDs of source and destination partitions that are needed to fetch
3715 : * the old (ctid1) and the new tuple (ctid2) from, respectively.
3716 : */
3717 : Oid ate_src_part;
3718 : Oid ate_dst_part;
3719 : } AfterTriggerEventData;
3720 :
3721 : /* AfterTriggerEventData, minus ate_src_part, ate_dst_part */
3722 : typedef struct AfterTriggerEventDataNoOids
3723 : {
3724 : TriggerFlags ate_flags;
3725 : ItemPointerData ate_ctid1;
3726 : ItemPointerData ate_ctid2;
3727 : } AfterTriggerEventDataNoOids;
3728 :
3729 : /* AfterTriggerEventData, minus ate_*_part and ate_ctid2 */
3730 : typedef struct AfterTriggerEventDataOneCtid
3731 : {
3732 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3733 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3734 : } AfterTriggerEventDataOneCtid;
3735 :
3736 : /* AfterTriggerEventData, minus ate_*_part, ate_ctid1 and ate_ctid2 */
3737 : typedef struct AfterTriggerEventDataZeroCtids
3738 : {
3739 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3740 : } AfterTriggerEventDataZeroCtids;
3741 :
3742 : #define SizeofTriggerEvent(evt) \
3743 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_CP_UPDATE ? \
3744 : sizeof(AfterTriggerEventData) : \
3745 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ? \
3746 : sizeof(AfterTriggerEventDataNoOids) : \
3747 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_1CTID ? \
3748 : sizeof(AfterTriggerEventDataOneCtid) : \
3749 : sizeof(AfterTriggerEventDataZeroCtids))))
3750 :
3751 : #define GetTriggerSharedData(evt) \
3752 : ((AfterTriggerShared) ((char *) (evt) + ((evt)->ate_flags & AFTER_TRIGGER_OFFSET)))
3753 :
3754 : /*
3755 : * To avoid palloc overhead, we keep trigger events in arrays in successively-
3756 : * larger chunks (a slightly more sophisticated version of an expansible
3757 : * array). The space between CHUNK_DATA_START and freeptr is occupied by
3758 : * AfterTriggerEventData records; the space between endfree and endptr is
3759 : * occupied by AfterTriggerSharedData records.
3760 : */
3761 : typedef struct AfterTriggerEventChunk
3762 : {
3763 : struct AfterTriggerEventChunk *next; /* list link */
3764 : char *freeptr; /* start of free space in chunk */
3765 : char *endfree; /* end of free space in chunk */
3766 : char *endptr; /* end of chunk */
3767 : /* event data follows here */
3768 : } AfterTriggerEventChunk;
3769 :
3770 : #define CHUNK_DATA_START(cptr) ((char *) (cptr) + MAXALIGN(sizeof(AfterTriggerEventChunk)))
3771 :
3772 : /* A list of events */
3773 : typedef struct AfterTriggerEventList
3774 : {
3775 : AfterTriggerEventChunk *head;
3776 : AfterTriggerEventChunk *tail;
3777 : char *tailfree; /* freeptr of tail chunk */
3778 : } AfterTriggerEventList;
3779 :
3780 : /* Macros to help in iterating over a list of events */
3781 : #define for_each_chunk(cptr, evtlist) \
3782 : for (cptr = (evtlist).head; cptr != NULL; cptr = cptr->next)
3783 : #define for_each_event(eptr, cptr) \
3784 : for (eptr = (AfterTriggerEvent) CHUNK_DATA_START(cptr); \
3785 : (char *) eptr < (cptr)->freeptr; \
3786 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3787 : /* Use this if no special per-chunk processing is needed */
3788 : #define for_each_event_chunk(eptr, cptr, evtlist) \
3789 : for_each_chunk(cptr, evtlist) for_each_event(eptr, cptr)
3790 :
3791 : /* Macros for iterating from a start point that might not be list start */
3792 : #define for_each_chunk_from(cptr) \
3793 : for (; cptr != NULL; cptr = cptr->next)
3794 : #define for_each_event_from(eptr, cptr) \
3795 : for (; \
3796 : (char *) eptr < (cptr)->freeptr; \
3797 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3798 :
3799 :
3800 : /*
3801 : * All per-transaction data for the AFTER TRIGGERS module.
3802 : *
3803 : * AfterTriggersData has the following fields:
3804 : *
3805 : * firing_counter is incremented for each call of afterTriggerInvokeEvents.
3806 : * We mark firable events with the current firing cycle's ID so that we can
3807 : * tell which ones to work on. This ensures sane behavior if a trigger
3808 : * function chooses to do SET CONSTRAINTS: the inner SET CONSTRAINTS will
3809 : * only fire those events that weren't already scheduled for firing.
3810 : *
3811 : * state keeps track of the transaction-local effects of SET CONSTRAINTS.
3812 : * This is saved and restored across failed subtransactions.
3813 : *
3814 : * events is the current list of deferred events. This is global across
3815 : * all subtransactions of the current transaction. In a subtransaction
3816 : * abort, we know that the events added by the subtransaction are at the
3817 : * end of the list, so it is relatively easy to discard them. The event
3818 : * list chunks themselves are stored in event_cxt.
3819 : *
3820 : * query_depth is the current depth of nested AfterTriggerBeginQuery calls
3821 : * (-1 when the stack is empty).
3822 : *
3823 : * query_stack[query_depth] is the per-query-level data, including these fields:
3824 : *
3825 : * events is a list of AFTER trigger events queued by the current query.
3826 : * None of these are valid until the matching AfterTriggerEndQuery call
3827 : * occurs. At that point we fire immediate-mode triggers, and append any
3828 : * deferred events to the main events list.
3829 : *
3830 : * fdw_tuplestore is a tuplestore containing the foreign-table tuples
3831 : * needed by events queued by the current query. (Note: we use just one
3832 : * tuplestore even though more than one foreign table might be involved.
3833 : * This is okay because tuplestores don't really care what's in the tuples
3834 : * they store; but it's possible that someday it'd break.)
3835 : *
3836 : * tables is a List of AfterTriggersTableData structs for target tables
3837 : * of the current query (see below).
3838 : *
3839 : * maxquerydepth is just the allocated length of query_stack.
3840 : *
3841 : * trans_stack holds per-subtransaction data, including these fields:
3842 : *
3843 : * state is NULL or a pointer to a saved copy of the SET CONSTRAINTS
3844 : * state data. Each subtransaction level that modifies that state first
3845 : * saves a copy, which we use to restore the state if we abort.
3846 : *
3847 : * events is a copy of the events head/tail pointers,
3848 : * which we use to restore those values during subtransaction abort.
3849 : *
3850 : * query_depth is the subtransaction-start-time value of query_depth,
3851 : * which we similarly use to clean up at subtransaction abort.
3852 : *
3853 : * firing_counter is the subtransaction-start-time value of firing_counter.
3854 : * We use this to recognize which deferred triggers were fired (or marked
3855 : * for firing) within an aborted subtransaction.
3856 : *
3857 : * We use GetCurrentTransactionNestLevel() to determine the correct array
3858 : * index in trans_stack. maxtransdepth is the number of allocated entries in
3859 : * trans_stack. (By not keeping our own stack pointer, we can avoid trouble
3860 : * in cases where errors during subxact abort cause multiple invocations
3861 : * of AfterTriggerEndSubXact() at the same nesting depth.)
3862 : *
3863 : * We create an AfterTriggersTableData struct for each target table of the
3864 : * current query, and each operation mode (INSERT/UPDATE/DELETE), that has
3865 : * either transition tables or statement-level triggers. This is used to
3866 : * hold the relevant transition tables, as well as info tracking whether
3867 : * we already queued the statement triggers. (We use that info to prevent
3868 : * firing the same statement triggers more than once per statement, or really
3869 : * once per transition table set.) These structs, along with the transition
3870 : * table tuplestores, live in the (sub)transaction's CurTransactionContext.
3871 : * That's sufficient lifespan because we don't allow transition tables to be
3872 : * used by deferrable triggers, so they only need to survive until
3873 : * AfterTriggerEndQuery.
3874 : */
3875 : typedef struct AfterTriggersQueryData AfterTriggersQueryData;
3876 : typedef struct AfterTriggersTransData AfterTriggersTransData;
3877 : typedef struct AfterTriggersTableData AfterTriggersTableData;
3878 :
3879 : typedef struct AfterTriggersData
3880 : {
3881 : CommandId firing_counter; /* next firing ID to assign */
3882 : SetConstraintState state; /* the active S C state */
3883 : AfterTriggerEventList events; /* deferred-event list */
3884 : MemoryContext event_cxt; /* memory context for events, if any */
3885 :
3886 : /* per-query-level data: */
3887 : AfterTriggersQueryData *query_stack; /* array of structs shown below */
3888 : int query_depth; /* current index in above array */
3889 : int maxquerydepth; /* allocated len of above array */
3890 :
3891 : /* per-subtransaction-level data: */
3892 : AfterTriggersTransData *trans_stack; /* array of structs shown below */
3893 : int maxtransdepth; /* allocated len of above array */
3894 : } AfterTriggersData;
3895 :
3896 : struct AfterTriggersQueryData
3897 : {
3898 : AfterTriggerEventList events; /* events pending from this query */
3899 : Tuplestorestate *fdw_tuplestore; /* foreign tuples for said events */
3900 : List *tables; /* list of AfterTriggersTableData, see below */
3901 : };
3902 :
3903 : struct AfterTriggersTransData
3904 : {
3905 : /* these fields are just for resetting at subtrans abort: */
3906 : SetConstraintState state; /* saved S C state, or NULL if not yet saved */
3907 : AfterTriggerEventList events; /* saved list pointer */
3908 : int query_depth; /* saved query_depth */
3909 : CommandId firing_counter; /* saved firing_counter */
3910 : };
3911 :
3912 : struct AfterTriggersTableData
3913 : {
3914 : /* relid + cmdType form the lookup key for these structs: */
3915 : Oid relid; /* target table's OID */
3916 : CmdType cmdType; /* event type, CMD_INSERT/UPDATE/DELETE */
3917 : bool closed; /* true when no longer OK to add tuples */
3918 : bool before_trig_done; /* did we already queue BS triggers? */
3919 : bool after_trig_done; /* did we already queue AS triggers? */
3920 : AfterTriggerEventList after_trig_events; /* if so, saved list pointer */
3921 :
3922 : /*
3923 : * We maintain separate transition tables for UPDATE/INSERT/DELETE since
3924 : * MERGE can run all three actions in a single statement. Note that UPDATE
3925 : * needs both old and new transition tables whereas INSERT needs only new,
3926 : * and DELETE needs only old.
3927 : */
3928 :
3929 : /* "old" transition table for UPDATE, if any */
3930 : Tuplestorestate *old_upd_tuplestore;
3931 : /* "new" transition table for UPDATE, if any */
3932 : Tuplestorestate *new_upd_tuplestore;
3933 : /* "old" transition table for DELETE, if any */
3934 : Tuplestorestate *old_del_tuplestore;
3935 : /* "new" transition table for INSERT, if any */
3936 : Tuplestorestate *new_ins_tuplestore;
3937 :
3938 : TupleTableSlot *storeslot; /* for converting to tuplestore's format */
3939 : };
3940 :
3941 : static AfterTriggersData afterTriggers;
3942 :
3943 : static void AfterTriggerExecute(EState *estate,
3944 : AfterTriggerEvent event,
3945 : ResultRelInfo *relInfo,
3946 : ResultRelInfo *src_relInfo,
3947 : ResultRelInfo *dst_relInfo,
3948 : TriggerDesc *trigdesc,
3949 : FmgrInfo *finfo,
3950 : Instrumentation *instr,
3951 : MemoryContext per_tuple_context,
3952 : TupleTableSlot *trig_tuple_slot1,
3953 : TupleTableSlot *trig_tuple_slot2);
3954 : static AfterTriggersTableData *GetAfterTriggersTableData(Oid relid,
3955 : CmdType cmdType);
3956 : static TupleTableSlot *GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
3957 : TupleDesc tupdesc);
3958 : static Tuplestorestate *GetAfterTriggersTransitionTable(int event,
3959 : TupleTableSlot *oldslot,
3960 : TupleTableSlot *newslot,
3961 : TransitionCaptureState *transition_capture);
3962 : static void TransitionTableAddTuple(EState *estate,
3963 : TransitionCaptureState *transition_capture,
3964 : ResultRelInfo *relinfo,
3965 : TupleTableSlot *slot,
3966 : TupleTableSlot *original_insert_tuple,
3967 : Tuplestorestate *tuplestore);
3968 : static void AfterTriggerFreeQuery(AfterTriggersQueryData *qs);
3969 : static SetConstraintState SetConstraintStateCreate(int numalloc);
3970 : static SetConstraintState SetConstraintStateCopy(SetConstraintState origstate);
3971 : static SetConstraintState SetConstraintStateAddItem(SetConstraintState state,
3972 : Oid tgoid, bool tgisdeferred);
3973 : static void cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent);
3974 :
3975 :
3976 : /*
3977 : * Get the FDW tuplestore for the current trigger query level, creating it
3978 : * if necessary.
3979 : */
3980 : static Tuplestorestate *
3981 100 : GetCurrentFDWTuplestore(void)
3982 : {
3983 : Tuplestorestate *ret;
3984 :
3985 100 : ret = afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore;
3986 100 : if (ret == NULL)
3987 : {
3988 : MemoryContext oldcxt;
3989 : ResourceOwner saveResourceOwner;
3990 :
3991 : /*
3992 : * Make the tuplestore valid until end of subtransaction. We really
3993 : * only need it until AfterTriggerEndQuery().
3994 : */
3995 36 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
3996 36 : saveResourceOwner = CurrentResourceOwner;
3997 36 : CurrentResourceOwner = CurTransactionResourceOwner;
3998 :
3999 36 : ret = tuplestore_begin_heap(false, false, work_mem);
4000 :
4001 36 : CurrentResourceOwner = saveResourceOwner;
4002 36 : MemoryContextSwitchTo(oldcxt);
4003 :
4004 36 : afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore = ret;
4005 : }
4006 :
4007 100 : return ret;
4008 : }
4009 :
4010 : /* ----------
4011 : * afterTriggerCheckState()
4012 : *
4013 : * Returns true if the trigger event is actually in state DEFERRED.
4014 : * ----------
4015 : */
4016 : static bool
4017 11942 : afterTriggerCheckState(AfterTriggerShared evtshared)
4018 : {
4019 11942 : Oid tgoid = evtshared->ats_tgoid;
4020 11942 : SetConstraintState state = afterTriggers.state;
4021 : int i;
4022 :
4023 : /*
4024 : * For not-deferrable triggers (i.e. normal AFTER ROW triggers and
4025 : * constraints declared NOT DEFERRABLE), the state is always false.
4026 : */
4027 11942 : if ((evtshared->ats_event & AFTER_TRIGGER_DEFERRABLE) == 0)
4028 11204 : return false;
4029 :
4030 : /*
4031 : * If constraint state exists, SET CONSTRAINTS might have been executed
4032 : * either for this trigger or for all triggers.
4033 : */
4034 738 : if (state != NULL)
4035 : {
4036 : /* Check for SET CONSTRAINTS for this specific trigger. */
4037 316 : for (i = 0; i < state->numstates; i++)
4038 : {
4039 250 : if (state->trigstates[i].sct_tgoid == tgoid)
4040 60 : return state->trigstates[i].sct_tgisdeferred;
4041 : }
4042 :
4043 : /* Check for SET CONSTRAINTS ALL. */
4044 66 : if (state->all_isset)
4045 54 : return state->all_isdeferred;
4046 : }
4047 :
4048 : /*
4049 : * Otherwise return the default state for the trigger.
4050 : */
4051 624 : return ((evtshared->ats_event & AFTER_TRIGGER_INITDEFERRED) != 0);
4052 : }
4053 :
4054 : /* ----------
4055 : * afterTriggerCopyBitmap()
4056 : *
4057 : * Copy bitmap into AfterTriggerEvents memory context, which is where the after
4058 : * trigger events are kept.
4059 : * ----------
4060 : */
4061 : static Bitmapset *
4062 11080 : afterTriggerCopyBitmap(Bitmapset *src)
4063 : {
4064 : Bitmapset *dst;
4065 : MemoryContext oldcxt;
4066 :
4067 11080 : if (src == NULL)
4068 7784 : return NULL;
4069 :
4070 3296 : oldcxt = MemoryContextSwitchTo(afterTriggers.event_cxt);
4071 :
4072 3296 : dst = bms_copy(src);
4073 :
4074 3296 : MemoryContextSwitchTo(oldcxt);
4075 :
4076 3296 : return dst;
4077 : }
4078 :
4079 : /* ----------
4080 : * afterTriggerAddEvent()
4081 : *
4082 : * Add a new trigger event to the specified queue.
4083 : * The passed-in event data is copied.
4084 : * ----------
4085 : */
4086 : static void
4087 12616 : afterTriggerAddEvent(AfterTriggerEventList *events,
4088 : AfterTriggerEvent event, AfterTriggerShared evtshared)
4089 : {
4090 12616 : Size eventsize = SizeofTriggerEvent(event);
4091 12616 : Size needed = eventsize + sizeof(AfterTriggerSharedData);
4092 : AfterTriggerEventChunk *chunk;
4093 : AfterTriggerShared newshared;
4094 : AfterTriggerEvent newevent;
4095 :
4096 : /*
4097 : * If empty list or not enough room in the tail chunk, make a new chunk.
4098 : * We assume here that a new shared record will always be needed.
4099 : */
4100 12616 : chunk = events->tail;
4101 12616 : if (chunk == NULL ||
4102 4714 : chunk->endfree - chunk->freeptr < needed)
4103 : {
4104 : Size chunksize;
4105 :
4106 : /* Create event context if we didn't already */
4107 7902 : if (afterTriggers.event_cxt == NULL)
4108 6668 : afterTriggers.event_cxt =
4109 6668 : AllocSetContextCreate(TopTransactionContext,
4110 : "AfterTriggerEvents",
4111 : ALLOCSET_DEFAULT_SIZES);
4112 :
4113 : /*
4114 : * Chunk size starts at 1KB and is allowed to increase up to 1MB.
4115 : * These numbers are fairly arbitrary, though there is a hard limit at
4116 : * AFTER_TRIGGER_OFFSET; else we couldn't link event records to their
4117 : * shared records using the available space in ate_flags. Another
4118 : * constraint is that if the chunk size gets too huge, the search loop
4119 : * below would get slow given a (not too common) usage pattern with
4120 : * many distinct event types in a chunk. Therefore, we double the
4121 : * preceding chunk size only if there weren't too many shared records
4122 : * in the preceding chunk; otherwise we halve it. This gives us some
4123 : * ability to adapt to the actual usage pattern of the current query
4124 : * while still having large chunk sizes in typical usage. All chunk
4125 : * sizes used should be MAXALIGN multiples, to ensure that the shared
4126 : * records will be aligned safely.
4127 : */
4128 : #define MIN_CHUNK_SIZE 1024
4129 : #define MAX_CHUNK_SIZE (1024*1024)
4130 :
4131 : #if MAX_CHUNK_SIZE > (AFTER_TRIGGER_OFFSET+1)
4132 : #error MAX_CHUNK_SIZE must not exceed AFTER_TRIGGER_OFFSET
4133 : #endif
4134 :
4135 7902 : if (chunk == NULL)
4136 7902 : chunksize = MIN_CHUNK_SIZE;
4137 : else
4138 : {
4139 : /* preceding chunk size... */
4140 0 : chunksize = chunk->endptr - (char *) chunk;
4141 : /* check number of shared records in preceding chunk */
4142 0 : if ((chunk->endptr - chunk->endfree) <=
4143 : (100 * sizeof(AfterTriggerSharedData)))
4144 0 : chunksize *= 2; /* okay, double it */
4145 : else
4146 0 : chunksize /= 2; /* too many shared records */
4147 0 : chunksize = Min(chunksize, MAX_CHUNK_SIZE);
4148 : }
4149 7902 : chunk = MemoryContextAlloc(afterTriggers.event_cxt, chunksize);
4150 7902 : chunk->next = NULL;
4151 7902 : chunk->freeptr = CHUNK_DATA_START(chunk);
4152 7902 : chunk->endptr = chunk->endfree = (char *) chunk + chunksize;
4153 : Assert(chunk->endfree - chunk->freeptr >= needed);
4154 :
4155 7902 : if (events->tail == NULL)
4156 : {
4157 : Assert(events->head == NULL);
4158 7902 : events->head = chunk;
4159 : }
4160 : else
4161 0 : events->tail->next = chunk;
4162 7902 : events->tail = chunk;
4163 : /* events->tailfree is now out of sync, but we'll fix it below */
4164 : }
4165 :
4166 : /*
4167 : * Try to locate a matching shared-data record already in the chunk. If
4168 : * none, make a new one. The search begins with the most recently added
4169 : * record, since newer ones are most likely to match.
4170 : */
4171 12616 : for (newshared = (AfterTriggerShared) chunk->endfree;
4172 17840 : (char *) newshared < chunk->endptr;
4173 5224 : newshared++)
4174 : {
4175 : /* compare fields roughly by probability of them being different */
4176 6760 : if (newshared->ats_tgoid == evtshared->ats_tgoid &&
4177 1754 : newshared->ats_event == evtshared->ats_event &&
4178 1748 : newshared->ats_firing_id == 0 &&
4179 1574 : newshared->ats_table == evtshared->ats_table &&
4180 1574 : newshared->ats_relid == evtshared->ats_relid &&
4181 3142 : newshared->ats_rolid == evtshared->ats_rolid &&
4182 1568 : bms_equal(newshared->ats_modifiedcols,
4183 1568 : evtshared->ats_modifiedcols))
4184 1536 : break;
4185 : }
4186 12616 : if ((char *) newshared >= chunk->endptr)
4187 : {
4188 11080 : newshared = ((AfterTriggerShared) chunk->endfree) - 1;
4189 11080 : *newshared = *evtshared;
4190 : /* now we must make a suitably-long-lived copy of the bitmap */
4191 11080 : newshared->ats_modifiedcols = afterTriggerCopyBitmap(evtshared->ats_modifiedcols);
4192 11080 : newshared->ats_firing_id = 0; /* just to be sure */
4193 11080 : chunk->endfree = (char *) newshared;
4194 : }
4195 :
4196 : /* Insert the data */
4197 12616 : newevent = (AfterTriggerEvent) chunk->freeptr;
4198 12616 : memcpy(newevent, event, eventsize);
4199 : /* ... and link the new event to its shared record */
4200 12616 : newevent->ate_flags &= ~AFTER_TRIGGER_OFFSET;
4201 12616 : newevent->ate_flags |= (char *) newshared - (char *) newevent;
4202 :
4203 12616 : chunk->freeptr += eventsize;
4204 12616 : events->tailfree = chunk->freeptr;
4205 12616 : }
4206 :
4207 : /* ----------
4208 : * afterTriggerFreeEventList()
4209 : *
4210 : * Free all the event storage in the given list.
4211 : * ----------
4212 : */
4213 : static void
4214 17134 : afterTriggerFreeEventList(AfterTriggerEventList *events)
4215 : {
4216 : AfterTriggerEventChunk *chunk;
4217 :
4218 23490 : while ((chunk = events->head) != NULL)
4219 : {
4220 6356 : events->head = chunk->next;
4221 6356 : pfree(chunk);
4222 : }
4223 17134 : events->tail = NULL;
4224 17134 : events->tailfree = NULL;
4225 17134 : }
4226 :
4227 : /* ----------
4228 : * afterTriggerRestoreEventList()
4229 : *
4230 : * Restore an event list to its prior length, removing all the events
4231 : * added since it had the value old_events.
4232 : * ----------
4233 : */
4234 : static void
4235 9372 : afterTriggerRestoreEventList(AfterTriggerEventList *events,
4236 : const AfterTriggerEventList *old_events)
4237 : {
4238 : AfterTriggerEventChunk *chunk;
4239 : AfterTriggerEventChunk *next_chunk;
4240 :
4241 9372 : if (old_events->tail == NULL)
4242 : {
4243 : /* restoring to a completely empty state, so free everything */
4244 9350 : afterTriggerFreeEventList(events);
4245 : }
4246 : else
4247 : {
4248 22 : *events = *old_events;
4249 : /* free any chunks after the last one we want to keep */
4250 22 : for (chunk = events->tail->next; chunk != NULL; chunk = next_chunk)
4251 : {
4252 0 : next_chunk = chunk->next;
4253 0 : pfree(chunk);
4254 : }
4255 : /* and clean up the tail chunk to be the right length */
4256 22 : events->tail->next = NULL;
4257 22 : events->tail->freeptr = events->tailfree;
4258 :
4259 : /*
4260 : * We don't make any effort to remove now-unused shared data records.
4261 : * They might still be useful, anyway.
4262 : */
4263 : }
4264 9372 : }
4265 :
4266 : /* ----------
4267 : * afterTriggerDeleteHeadEventChunk()
4268 : *
4269 : * Remove the first chunk of events from the query level's event list.
4270 : * Keep any event list pointers elsewhere in the query level's data
4271 : * structures in sync.
4272 : * ----------
4273 : */
4274 : static void
4275 0 : afterTriggerDeleteHeadEventChunk(AfterTriggersQueryData *qs)
4276 : {
4277 0 : AfterTriggerEventChunk *target = qs->events.head;
4278 : ListCell *lc;
4279 :
4280 : Assert(target && target->next);
4281 :
4282 : /*
4283 : * First, update any pointers in the per-table data, so that they won't be
4284 : * dangling. Resetting obsoleted pointers to NULL will make
4285 : * cancel_prior_stmt_triggers start from the list head, which is fine.
4286 : */
4287 0 : foreach(lc, qs->tables)
4288 : {
4289 0 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
4290 :
4291 0 : if (table->after_trig_done &&
4292 0 : table->after_trig_events.tail == target)
4293 : {
4294 0 : table->after_trig_events.head = NULL;
4295 0 : table->after_trig_events.tail = NULL;
4296 0 : table->after_trig_events.tailfree = NULL;
4297 : }
4298 : }
4299 :
4300 : /* Now we can flush the head chunk */
4301 0 : qs->events.head = target->next;
4302 0 : pfree(target);
4303 0 : }
4304 :
4305 :
4306 : /* ----------
4307 : * AfterTriggerExecute()
4308 : *
4309 : * Fetch the required tuples back from the heap and fire one
4310 : * single trigger function.
4311 : *
4312 : * Frequently, this will be fired many times in a row for triggers of
4313 : * a single relation. Therefore, we cache the open relation and provide
4314 : * fmgr lookup cache space at the caller level. (For triggers fired at
4315 : * the end of a query, we can even piggyback on the executor's state.)
4316 : *
4317 : * When fired for a cross-partition update of a partitioned table, the old
4318 : * tuple is fetched using 'src_relInfo' (the source leaf partition) and
4319 : * the new tuple using 'dst_relInfo' (the destination leaf partition), though
4320 : * both are converted into the root partitioned table's format before passing
4321 : * to the trigger function.
4322 : *
4323 : * event: event currently being fired.
4324 : * relInfo: result relation for event.
4325 : * src_relInfo: source partition of a cross-partition update
4326 : * dst_relInfo: its destination partition
4327 : * trigdesc: working copy of rel's trigger info.
4328 : * finfo: array of fmgr lookup cache entries (one per trigger in trigdesc).
4329 : * instr: array of EXPLAIN ANALYZE instrumentation nodes (one per trigger),
4330 : * or NULL if no instrumentation is wanted.
4331 : * per_tuple_context: memory context to call trigger function in.
4332 : * trig_tuple_slot1: scratch slot for tg_trigtuple (foreign tables only)
4333 : * trig_tuple_slot2: scratch slot for tg_newtuple (foreign tables only)
4334 : * ----------
4335 : */
4336 : static void
4337 11656 : AfterTriggerExecute(EState *estate,
4338 : AfterTriggerEvent event,
4339 : ResultRelInfo *relInfo,
4340 : ResultRelInfo *src_relInfo,
4341 : ResultRelInfo *dst_relInfo,
4342 : TriggerDesc *trigdesc,
4343 : FmgrInfo *finfo, Instrumentation *instr,
4344 : MemoryContext per_tuple_context,
4345 : TupleTableSlot *trig_tuple_slot1,
4346 : TupleTableSlot *trig_tuple_slot2)
4347 : {
4348 11656 : Relation rel = relInfo->ri_RelationDesc;
4349 11656 : Relation src_rel = src_relInfo->ri_RelationDesc;
4350 11656 : Relation dst_rel = dst_relInfo->ri_RelationDesc;
4351 11656 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4352 11656 : Oid tgoid = evtshared->ats_tgoid;
4353 11656 : TriggerData LocTriggerData = {0};
4354 : Oid save_rolid;
4355 : int save_sec_context;
4356 : HeapTuple rettuple;
4357 : int tgindx;
4358 11656 : bool should_free_trig = false;
4359 11656 : bool should_free_new = false;
4360 :
4361 : /*
4362 : * Locate trigger in trigdesc. It might not be present, and in fact the
4363 : * trigdesc could be NULL, if the trigger was dropped since the event was
4364 : * queued. In that case, silently do nothing.
4365 : */
4366 11656 : if (trigdesc == NULL)
4367 6 : return;
4368 26002 : for (tgindx = 0; tgindx < trigdesc->numtriggers; tgindx++)
4369 : {
4370 26002 : if (trigdesc->triggers[tgindx].tgoid == tgoid)
4371 : {
4372 11650 : LocTriggerData.tg_trigger = &(trigdesc->triggers[tgindx]);
4373 11650 : break;
4374 : }
4375 : }
4376 11650 : if (LocTriggerData.tg_trigger == NULL)
4377 0 : return;
4378 :
4379 : /*
4380 : * If doing EXPLAIN ANALYZE, start charging time to this trigger. We want
4381 : * to include time spent re-fetching tuples in the trigger cost.
4382 : */
4383 11650 : if (instr)
4384 0 : InstrStartNode(instr + tgindx);
4385 :
4386 : /*
4387 : * Fetch the required tuple(s).
4388 : */
4389 11650 : switch (event->ate_flags & AFTER_TRIGGER_TUP_BITS)
4390 : {
4391 50 : case AFTER_TRIGGER_FDW_FETCH:
4392 : {
4393 50 : Tuplestorestate *fdw_tuplestore = GetCurrentFDWTuplestore();
4394 :
4395 50 : if (!tuplestore_gettupleslot(fdw_tuplestore, true, false,
4396 : trig_tuple_slot1))
4397 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4398 :
4399 50 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4400 18 : TRIGGER_EVENT_UPDATE &&
4401 18 : !tuplestore_gettupleslot(fdw_tuplestore, true, false,
4402 : trig_tuple_slot2))
4403 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4404 : }
4405 : /* fall through */
4406 : case AFTER_TRIGGER_FDW_REUSE:
4407 :
4408 : /*
4409 : * Store tuple in the slot so that tg_trigtuple does not reference
4410 : * tuplestore memory. (It is formally possible for the trigger
4411 : * function to queue trigger events that add to the same
4412 : * tuplestore, which can push other tuples out of memory.) The
4413 : * distinction is academic, because we start with a minimal tuple
4414 : * that is stored as a heap tuple, constructed in different memory
4415 : * context, in the slot anyway.
4416 : */
4417 58 : LocTriggerData.tg_trigslot = trig_tuple_slot1;
4418 58 : LocTriggerData.tg_trigtuple =
4419 58 : ExecFetchSlotHeapTuple(trig_tuple_slot1, true, &should_free_trig);
4420 :
4421 58 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4422 : TRIGGER_EVENT_UPDATE)
4423 : {
4424 22 : LocTriggerData.tg_newslot = trig_tuple_slot2;
4425 22 : LocTriggerData.tg_newtuple =
4426 22 : ExecFetchSlotHeapTuple(trig_tuple_slot2, true, &should_free_new);
4427 : }
4428 : else
4429 : {
4430 36 : LocTriggerData.tg_newtuple = NULL;
4431 : }
4432 58 : break;
4433 :
4434 11592 : default:
4435 11592 : if (ItemPointerIsValid(&(event->ate_ctid1)))
4436 : {
4437 10552 : TupleTableSlot *src_slot = ExecGetTriggerOldSlot(estate,
4438 : src_relInfo);
4439 :
4440 10552 : if (!table_tuple_fetch_row_version(src_rel,
4441 : &(event->ate_ctid1),
4442 : SnapshotAny,
4443 : src_slot))
4444 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4445 :
4446 : /*
4447 : * Store the tuple fetched from the source partition into the
4448 : * target (root partitioned) table slot, converting if needed.
4449 : */
4450 10552 : if (src_relInfo != relInfo)
4451 : {
4452 144 : TupleConversionMap *map = ExecGetChildToRootMap(src_relInfo);
4453 :
4454 144 : LocTriggerData.tg_trigslot = ExecGetTriggerOldSlot(estate, relInfo);
4455 144 : if (map)
4456 : {
4457 36 : execute_attr_map_slot(map->attrMap,
4458 : src_slot,
4459 : LocTriggerData.tg_trigslot);
4460 : }
4461 : else
4462 108 : ExecCopySlot(LocTriggerData.tg_trigslot, src_slot);
4463 : }
4464 : else
4465 10408 : LocTriggerData.tg_trigslot = src_slot;
4466 10552 : LocTriggerData.tg_trigtuple =
4467 10552 : ExecFetchSlotHeapTuple(LocTriggerData.tg_trigslot, false, &should_free_trig);
4468 : }
4469 : else
4470 : {
4471 1040 : LocTriggerData.tg_trigtuple = NULL;
4472 : }
4473 :
4474 : /* don't touch ctid2 if not there */
4475 11592 : if (((event->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ||
4476 11736 : (event->ate_flags & AFTER_TRIGGER_CP_UPDATE)) &&
4477 3110 : ItemPointerIsValid(&(event->ate_ctid2)))
4478 3110 : {
4479 3110 : TupleTableSlot *dst_slot = ExecGetTriggerNewSlot(estate,
4480 : dst_relInfo);
4481 :
4482 3110 : if (!table_tuple_fetch_row_version(dst_rel,
4483 : &(event->ate_ctid2),
4484 : SnapshotAny,
4485 : dst_slot))
4486 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4487 :
4488 : /*
4489 : * Store the tuple fetched from the destination partition into
4490 : * the target (root partitioned) table slot, converting if
4491 : * needed.
4492 : */
4493 3110 : if (dst_relInfo != relInfo)
4494 : {
4495 144 : TupleConversionMap *map = ExecGetChildToRootMap(dst_relInfo);
4496 :
4497 144 : LocTriggerData.tg_newslot = ExecGetTriggerNewSlot(estate, relInfo);
4498 144 : if (map)
4499 : {
4500 36 : execute_attr_map_slot(map->attrMap,
4501 : dst_slot,
4502 : LocTriggerData.tg_newslot);
4503 : }
4504 : else
4505 108 : ExecCopySlot(LocTriggerData.tg_newslot, dst_slot);
4506 : }
4507 : else
4508 2966 : LocTriggerData.tg_newslot = dst_slot;
4509 3110 : LocTriggerData.tg_newtuple =
4510 3110 : ExecFetchSlotHeapTuple(LocTriggerData.tg_newslot, false, &should_free_new);
4511 : }
4512 : else
4513 : {
4514 8482 : LocTriggerData.tg_newtuple = NULL;
4515 : }
4516 : }
4517 :
4518 : /*
4519 : * Set up the tuplestore information to let the trigger have access to
4520 : * transition tables. When we first make a transition table available to
4521 : * a trigger, mark it "closed" so that it cannot change anymore. If any
4522 : * additional events of the same type get queued in the current trigger
4523 : * query level, they'll go into new transition tables.
4524 : */
4525 11650 : LocTriggerData.tg_oldtable = LocTriggerData.tg_newtable = NULL;
4526 11650 : if (evtshared->ats_table)
4527 : {
4528 564 : if (LocTriggerData.tg_trigger->tgoldtable)
4529 : {
4530 312 : if (TRIGGER_FIRED_BY_UPDATE(evtshared->ats_event))
4531 162 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_upd_tuplestore;
4532 : else
4533 150 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_del_tuplestore;
4534 312 : evtshared->ats_table->closed = true;
4535 : }
4536 :
4537 564 : if (LocTriggerData.tg_trigger->tgnewtable)
4538 : {
4539 402 : if (TRIGGER_FIRED_BY_INSERT(evtshared->ats_event))
4540 222 : LocTriggerData.tg_newtable = evtshared->ats_table->new_ins_tuplestore;
4541 : else
4542 180 : LocTriggerData.tg_newtable = evtshared->ats_table->new_upd_tuplestore;
4543 402 : evtshared->ats_table->closed = true;
4544 : }
4545 : }
4546 :
4547 : /*
4548 : * Setup the remaining trigger information
4549 : */
4550 11650 : LocTriggerData.type = T_TriggerData;
4551 11650 : LocTriggerData.tg_event =
4552 11650 : evtshared->ats_event & (TRIGGER_EVENT_OPMASK | TRIGGER_EVENT_ROW);
4553 11650 : LocTriggerData.tg_relation = rel;
4554 11650 : if (TRIGGER_FOR_UPDATE(LocTriggerData.tg_trigger->tgtype))
4555 5460 : LocTriggerData.tg_updatedcols = evtshared->ats_modifiedcols;
4556 :
4557 11650 : MemoryContextReset(per_tuple_context);
4558 :
4559 : /*
4560 : * If necessary, become the role that was active when the trigger got
4561 : * queued. Note that the role might have been dropped since the trigger
4562 : * was queued, but if that is a problem, we will get an error later.
4563 : * Checking here would still leave a race condition.
4564 : */
4565 11650 : GetUserIdAndSecContext(&save_rolid, &save_sec_context);
4566 11650 : if (save_rolid != evtshared->ats_rolid)
4567 24 : SetUserIdAndSecContext(evtshared->ats_rolid,
4568 : save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
4569 :
4570 : /*
4571 : * Call the trigger and throw away any possibly returned updated tuple.
4572 : * (Don't let ExecCallTriggerFunc measure EXPLAIN time.)
4573 : */
4574 11650 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
4575 : tgindx,
4576 : finfo,
4577 : NULL,
4578 : per_tuple_context);
4579 10352 : if (rettuple != NULL &&
4580 3416 : rettuple != LocTriggerData.tg_trigtuple &&
4581 1440 : rettuple != LocTriggerData.tg_newtuple)
4582 0 : heap_freetuple(rettuple);
4583 :
4584 : /* Restore the current role if necessary */
4585 10352 : if (save_rolid != evtshared->ats_rolid)
4586 18 : SetUserIdAndSecContext(save_rolid, save_sec_context);
4587 :
4588 : /*
4589 : * Release resources
4590 : */
4591 10352 : if (should_free_trig)
4592 172 : heap_freetuple(LocTriggerData.tg_trigtuple);
4593 10352 : if (should_free_new)
4594 136 : heap_freetuple(LocTriggerData.tg_newtuple);
4595 :
4596 : /* don't clear slots' contents if foreign table */
4597 10352 : if (trig_tuple_slot1 == NULL)
4598 : {
4599 10282 : if (LocTriggerData.tg_trigslot)
4600 9302 : ExecClearTuple(LocTriggerData.tg_trigslot);
4601 10282 : if (LocTriggerData.tg_newslot)
4602 2782 : ExecClearTuple(LocTriggerData.tg_newslot);
4603 : }
4604 :
4605 : /*
4606 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
4607 : * one "tuple returned" (really the number of firings).
4608 : */
4609 10352 : if (instr)
4610 0 : InstrStopNode(instr + tgindx, 1);
4611 : }
4612 :
4613 :
4614 : /*
4615 : * afterTriggerMarkEvents()
4616 : *
4617 : * Scan the given event list for not yet invoked events. Mark the ones
4618 : * that can be invoked now with the current firing ID.
4619 : *
4620 : * If move_list isn't NULL, events that are not to be invoked now are
4621 : * transferred to move_list.
4622 : *
4623 : * When immediate_only is true, do not invoke currently-deferred triggers.
4624 : * (This will be false only at main transaction exit.)
4625 : *
4626 : * Returns true if any invokable events were found.
4627 : */
4628 : static bool
4629 1071900 : afterTriggerMarkEvents(AfterTriggerEventList *events,
4630 : AfterTriggerEventList *move_list,
4631 : bool immediate_only)
4632 : {
4633 1071900 : bool found = false;
4634 1071900 : bool deferred_found = false;
4635 : AfterTriggerEvent event;
4636 : AfterTriggerEventChunk *chunk;
4637 :
4638 1093326 : for_each_event_chunk(event, chunk, *events)
4639 : {
4640 13298 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4641 13298 : bool defer_it = false;
4642 :
4643 13298 : if (!(event->ate_flags &
4644 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS)))
4645 : {
4646 : /*
4647 : * This trigger hasn't been called or scheduled yet. Check if we
4648 : * should call it now.
4649 : */
4650 12464 : if (immediate_only && afterTriggerCheckState(evtshared))
4651 : {
4652 618 : defer_it = true;
4653 : }
4654 : else
4655 : {
4656 : /*
4657 : * Mark it as to be fired in this firing cycle.
4658 : */
4659 11846 : evtshared->ats_firing_id = afterTriggers.firing_counter;
4660 11846 : event->ate_flags |= AFTER_TRIGGER_IN_PROGRESS;
4661 11846 : found = true;
4662 : }
4663 : }
4664 :
4665 : /*
4666 : * If it's deferred, move it to move_list, if requested.
4667 : */
4668 13298 : if (defer_it && move_list != NULL)
4669 : {
4670 618 : deferred_found = true;
4671 : /* add it to move_list */
4672 618 : afterTriggerAddEvent(move_list, event, evtshared);
4673 : /* mark original copy "done" so we don't do it again */
4674 618 : event->ate_flags |= AFTER_TRIGGER_DONE;
4675 : }
4676 : }
4677 :
4678 : /*
4679 : * We could allow deferred triggers if, before the end of the
4680 : * security-restricted operation, we were to verify that a SET CONSTRAINTS
4681 : * ... IMMEDIATE has fired all such triggers. For now, don't bother.
4682 : */
4683 1071900 : if (deferred_found && InSecurityRestrictedOperation())
4684 12 : ereport(ERROR,
4685 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4686 : errmsg("cannot fire deferred trigger within security-restricted operation")));
4687 :
4688 1071888 : return found;
4689 : }
4690 :
4691 : /*
4692 : * afterTriggerInvokeEvents()
4693 : *
4694 : * Scan the given event list for events that are marked as to be fired
4695 : * in the current firing cycle, and fire them.
4696 : *
4697 : * If estate isn't NULL, we use its result relation info to avoid repeated
4698 : * openings and closing of trigger target relations. If it is NULL, we
4699 : * make one locally to cache the info in case there are multiple trigger
4700 : * events per rel.
4701 : *
4702 : * When delete_ok is true, it's safe to delete fully-processed events.
4703 : * (We are not very tense about that: we simply reset a chunk to be empty
4704 : * if all its events got fired. The objective here is just to avoid useless
4705 : * rescanning of events when a trigger queues new events during transaction
4706 : * end, so it's not necessary to worry much about the case where only
4707 : * some events are fired.)
4708 : *
4709 : * Returns true if no unfired events remain in the list (this allows us
4710 : * to avoid repeating afterTriggerMarkEvents).
4711 : */
4712 : static bool
4713 7660 : afterTriggerInvokeEvents(AfterTriggerEventList *events,
4714 : CommandId firing_id,
4715 : EState *estate,
4716 : bool delete_ok)
4717 : {
4718 7660 : bool all_fired = true;
4719 : AfterTriggerEventChunk *chunk;
4720 : MemoryContext per_tuple_context;
4721 7660 : bool local_estate = false;
4722 7660 : ResultRelInfo *rInfo = NULL;
4723 7660 : Relation rel = NULL;
4724 7660 : TriggerDesc *trigdesc = NULL;
4725 7660 : FmgrInfo *finfo = NULL;
4726 7660 : Instrumentation *instr = NULL;
4727 7660 : TupleTableSlot *slot1 = NULL,
4728 7660 : *slot2 = NULL;
4729 :
4730 : /* Make a local EState if need be */
4731 7660 : if (estate == NULL)
4732 : {
4733 362 : estate = CreateExecutorState();
4734 362 : local_estate = true;
4735 : }
4736 :
4737 : /* Make a per-tuple memory context for trigger function calls */
4738 : per_tuple_context =
4739 7660 : AllocSetContextCreate(CurrentMemoryContext,
4740 : "AfterTriggerTupleContext",
4741 : ALLOCSET_DEFAULT_SIZES);
4742 :
4743 14022 : for_each_chunk(chunk, *events)
4744 : {
4745 : AfterTriggerEvent event;
4746 7660 : bool all_fired_in_chunk = true;
4747 :
4748 19488 : for_each_event(event, chunk)
4749 : {
4750 13126 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4751 :
4752 : /*
4753 : * Is it one for me to fire?
4754 : */
4755 13126 : if ((event->ate_flags & AFTER_TRIGGER_IN_PROGRESS) &&
4756 11656 : evtshared->ats_firing_id == firing_id)
4757 10358 : {
4758 : ResultRelInfo *src_rInfo,
4759 : *dst_rInfo;
4760 :
4761 : /*
4762 : * So let's fire it... but first, find the correct relation if
4763 : * this is not the same relation as before.
4764 : */
4765 11656 : if (rel == NULL || RelationGetRelid(rel) != evtshared->ats_relid)
4766 : {
4767 7962 : rInfo = ExecGetTriggerResultRel(estate, evtshared->ats_relid,
4768 : NULL);
4769 7962 : rel = rInfo->ri_RelationDesc;
4770 : /* Catch calls with insufficient relcache refcounting */
4771 : Assert(!RelationHasReferenceCountZero(rel));
4772 7962 : trigdesc = rInfo->ri_TrigDesc;
4773 : /* caution: trigdesc could be NULL here */
4774 7962 : finfo = rInfo->ri_TrigFunctions;
4775 7962 : instr = rInfo->ri_TrigInstrument;
4776 7962 : if (slot1 != NULL)
4777 : {
4778 0 : ExecDropSingleTupleTableSlot(slot1);
4779 0 : ExecDropSingleTupleTableSlot(slot2);
4780 0 : slot1 = slot2 = NULL;
4781 : }
4782 7962 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
4783 : {
4784 38 : slot1 = MakeSingleTupleTableSlot(rel->rd_att,
4785 : &TTSOpsMinimalTuple);
4786 38 : slot2 = MakeSingleTupleTableSlot(rel->rd_att,
4787 : &TTSOpsMinimalTuple);
4788 : }
4789 : }
4790 :
4791 : /*
4792 : * Look up source and destination partition result rels of a
4793 : * cross-partition update event.
4794 : */
4795 11656 : if ((event->ate_flags & AFTER_TRIGGER_TUP_BITS) ==
4796 : AFTER_TRIGGER_CP_UPDATE)
4797 : {
4798 : Assert(OidIsValid(event->ate_src_part) &&
4799 : OidIsValid(event->ate_dst_part));
4800 144 : src_rInfo = ExecGetTriggerResultRel(estate,
4801 : event->ate_src_part,
4802 : rInfo);
4803 144 : dst_rInfo = ExecGetTriggerResultRel(estate,
4804 : event->ate_dst_part,
4805 : rInfo);
4806 : }
4807 : else
4808 11512 : src_rInfo = dst_rInfo = rInfo;
4809 :
4810 : /*
4811 : * Fire it. Note that the AFTER_TRIGGER_IN_PROGRESS flag is
4812 : * still set, so recursive examinations of the event list
4813 : * won't try to re-fire it.
4814 : */
4815 11656 : AfterTriggerExecute(estate, event, rInfo,
4816 : src_rInfo, dst_rInfo,
4817 : trigdesc, finfo, instr,
4818 : per_tuple_context, slot1, slot2);
4819 :
4820 : /*
4821 : * Mark the event as done.
4822 : */
4823 10358 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
4824 10358 : event->ate_flags |= AFTER_TRIGGER_DONE;
4825 : }
4826 1470 : else if (!(event->ate_flags & AFTER_TRIGGER_DONE))
4827 : {
4828 : /* something remains to be done */
4829 510 : all_fired = all_fired_in_chunk = false;
4830 : }
4831 : }
4832 :
4833 : /* Clear the chunk if delete_ok and nothing left of interest */
4834 6362 : if (delete_ok && all_fired_in_chunk)
4835 : {
4836 192 : chunk->freeptr = CHUNK_DATA_START(chunk);
4837 192 : chunk->endfree = chunk->endptr;
4838 :
4839 : /*
4840 : * If it's last chunk, must sync event list's tailfree too. Note
4841 : * that delete_ok must NOT be passed as true if there could be
4842 : * additional AfterTriggerEventList values pointing at this event
4843 : * list, since we'd fail to fix their copies of tailfree.
4844 : */
4845 192 : if (chunk == events->tail)
4846 192 : events->tailfree = chunk->freeptr;
4847 : }
4848 : }
4849 6362 : if (slot1 != NULL)
4850 : {
4851 38 : ExecDropSingleTupleTableSlot(slot1);
4852 38 : ExecDropSingleTupleTableSlot(slot2);
4853 : }
4854 :
4855 : /* Release working resources */
4856 6362 : MemoryContextDelete(per_tuple_context);
4857 :
4858 6362 : if (local_estate)
4859 : {
4860 192 : ExecCloseResultRelations(estate);
4861 192 : ExecResetTupleTable(estate->es_tupleTable, false);
4862 192 : FreeExecutorState(estate);
4863 : }
4864 :
4865 6362 : return all_fired;
4866 : }
4867 :
4868 :
4869 : /*
4870 : * GetAfterTriggersTableData
4871 : *
4872 : * Find or create an AfterTriggersTableData struct for the specified
4873 : * trigger event (relation + operation type). Ignore existing structs
4874 : * marked "closed"; we don't want to put any additional tuples into them,
4875 : * nor change their stmt-triggers-fired state.
4876 : *
4877 : * Note: the AfterTriggersTableData list is allocated in the current
4878 : * (sub)transaction's CurTransactionContext. This is OK because
4879 : * we don't need it to live past AfterTriggerEndQuery.
4880 : */
4881 : static AfterTriggersTableData *
4882 2194 : GetAfterTriggersTableData(Oid relid, CmdType cmdType)
4883 : {
4884 : AfterTriggersTableData *table;
4885 : AfterTriggersQueryData *qs;
4886 : MemoryContext oldcxt;
4887 : ListCell *lc;
4888 :
4889 : /* Caller should have ensured query_depth is OK. */
4890 : Assert(afterTriggers.query_depth >= 0 &&
4891 : afterTriggers.query_depth < afterTriggers.maxquerydepth);
4892 2194 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
4893 :
4894 2542 : foreach(lc, qs->tables)
4895 : {
4896 1438 : table = (AfterTriggersTableData *) lfirst(lc);
4897 1438 : if (table->relid == relid && table->cmdType == cmdType &&
4898 1126 : !table->closed)
4899 1090 : return table;
4900 : }
4901 :
4902 1104 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4903 :
4904 1104 : table = (AfterTriggersTableData *) palloc0(sizeof(AfterTriggersTableData));
4905 1104 : table->relid = relid;
4906 1104 : table->cmdType = cmdType;
4907 1104 : qs->tables = lappend(qs->tables, table);
4908 :
4909 1104 : MemoryContextSwitchTo(oldcxt);
4910 :
4911 1104 : return table;
4912 : }
4913 :
4914 : /*
4915 : * Returns a TupleTableSlot suitable for holding the tuples to be put
4916 : * into AfterTriggersTableData's transition table tuplestores.
4917 : */
4918 : static TupleTableSlot *
4919 294 : GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
4920 : TupleDesc tupdesc)
4921 : {
4922 : /* Create it if not already done. */
4923 294 : if (!table->storeslot)
4924 : {
4925 : MemoryContext oldcxt;
4926 :
4927 : /*
4928 : * We need this slot only until AfterTriggerEndQuery, but making it
4929 : * last till end-of-subxact is good enough. It'll be freed by
4930 : * AfterTriggerFreeQuery(). However, the passed-in tupdesc might have
4931 : * a different lifespan, so we'd better make a copy of that.
4932 : */
4933 84 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4934 84 : tupdesc = CreateTupleDescCopy(tupdesc);
4935 84 : table->storeslot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
4936 84 : MemoryContextSwitchTo(oldcxt);
4937 : }
4938 :
4939 294 : return table->storeslot;
4940 : }
4941 :
4942 : /*
4943 : * MakeTransitionCaptureState
4944 : *
4945 : * Make a TransitionCaptureState object for the given TriggerDesc, target
4946 : * relation, and operation type. The TCS object holds all the state needed
4947 : * to decide whether to capture tuples in transition tables.
4948 : *
4949 : * If there are no triggers in 'trigdesc' that request relevant transition
4950 : * tables, then return NULL.
4951 : *
4952 : * The resulting object can be passed to the ExecAR* functions. When
4953 : * dealing with child tables, the caller can set tcs_original_insert_tuple
4954 : * to avoid having to reconstruct the original tuple in the root table's
4955 : * format.
4956 : *
4957 : * Note that we copy the flags from a parent table into this struct (rather
4958 : * than subsequently using the relation's TriggerDesc directly) so that we can
4959 : * use it to control collection of transition tuples from child tables.
4960 : *
4961 : * Per SQL spec, all operations of the same kind (INSERT/UPDATE/DELETE)
4962 : * on the same table during one query should share one transition table.
4963 : * Therefore, the Tuplestores are owned by an AfterTriggersTableData struct
4964 : * looked up using the table OID + CmdType, and are merely referenced by
4965 : * the TransitionCaptureState objects we hand out to callers.
4966 : */
4967 : TransitionCaptureState *
4968 118440 : MakeTransitionCaptureState(TriggerDesc *trigdesc, Oid relid, CmdType cmdType)
4969 : {
4970 : TransitionCaptureState *state;
4971 : bool need_old_upd,
4972 : need_new_upd,
4973 : need_old_del,
4974 : need_new_ins;
4975 : AfterTriggersTableData *table;
4976 : MemoryContext oldcxt;
4977 : ResourceOwner saveResourceOwner;
4978 :
4979 118440 : if (trigdesc == NULL)
4980 105718 : return NULL;
4981 :
4982 : /* Detect which table(s) we need. */
4983 12722 : switch (cmdType)
4984 : {
4985 7030 : case CMD_INSERT:
4986 7030 : need_old_upd = need_old_del = need_new_upd = false;
4987 7030 : need_new_ins = trigdesc->trig_insert_new_table;
4988 7030 : break;
4989 3914 : case CMD_UPDATE:
4990 3914 : need_old_upd = trigdesc->trig_update_old_table;
4991 3914 : need_new_upd = trigdesc->trig_update_new_table;
4992 3914 : need_old_del = need_new_ins = false;
4993 3914 : break;
4994 1450 : case CMD_DELETE:
4995 1450 : need_old_del = trigdesc->trig_delete_old_table;
4996 1450 : need_old_upd = need_new_upd = need_new_ins = false;
4997 1450 : break;
4998 328 : case CMD_MERGE:
4999 328 : need_old_upd = trigdesc->trig_update_old_table;
5000 328 : need_new_upd = trigdesc->trig_update_new_table;
5001 328 : need_old_del = trigdesc->trig_delete_old_table;
5002 328 : need_new_ins = trigdesc->trig_insert_new_table;
5003 328 : break;
5004 0 : default:
5005 0 : elog(ERROR, "unexpected CmdType: %d", (int) cmdType);
5006 : /* keep compiler quiet */
5007 : need_old_upd = need_new_upd = need_old_del = need_new_ins = false;
5008 : break;
5009 : }
5010 12722 : if (!need_old_upd && !need_new_upd && !need_new_ins && !need_old_del)
5011 12124 : return NULL;
5012 :
5013 : /* Check state, like AfterTriggerSaveEvent. */
5014 598 : if (afterTriggers.query_depth < 0)
5015 0 : elog(ERROR, "MakeTransitionCaptureState() called outside of query");
5016 :
5017 : /* Be sure we have enough space to record events at this query depth. */
5018 598 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
5019 454 : AfterTriggerEnlargeQueryState();
5020 :
5021 : /*
5022 : * Find or create an AfterTriggersTableData struct to hold the
5023 : * tuplestore(s). If there's a matching struct but it's marked closed,
5024 : * ignore it; we need a newer one.
5025 : *
5026 : * Note: the AfterTriggersTableData list, as well as the tuplestores, are
5027 : * allocated in the current (sub)transaction's CurTransactionContext, and
5028 : * the tuplestores are managed by the (sub)transaction's resource owner.
5029 : * This is sufficient lifespan because we do not allow triggers using
5030 : * transition tables to be deferrable; they will be fired during
5031 : * AfterTriggerEndQuery, after which it's okay to delete the data.
5032 : */
5033 598 : table = GetAfterTriggersTableData(relid, cmdType);
5034 :
5035 : /* Now create required tuplestore(s), if we don't have them already. */
5036 598 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
5037 598 : saveResourceOwner = CurrentResourceOwner;
5038 598 : CurrentResourceOwner = CurTransactionResourceOwner;
5039 :
5040 598 : if (need_old_upd && table->old_upd_tuplestore == NULL)
5041 172 : table->old_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
5042 598 : if (need_new_upd && table->new_upd_tuplestore == NULL)
5043 184 : table->new_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
5044 598 : if (need_old_del && table->old_del_tuplestore == NULL)
5045 142 : table->old_del_tuplestore = tuplestore_begin_heap(false, false, work_mem);
5046 598 : if (need_new_ins && table->new_ins_tuplestore == NULL)
5047 230 : table->new_ins_tuplestore = tuplestore_begin_heap(false, false, work_mem);
5048 :
5049 598 : CurrentResourceOwner = saveResourceOwner;
5050 598 : MemoryContextSwitchTo(oldcxt);
5051 :
5052 : /* Now build the TransitionCaptureState struct, in caller's context */
5053 598 : state = (TransitionCaptureState *) palloc0(sizeof(TransitionCaptureState));
5054 598 : state->tcs_delete_old_table = need_old_del;
5055 598 : state->tcs_update_old_table = need_old_upd;
5056 598 : state->tcs_update_new_table = need_new_upd;
5057 598 : state->tcs_insert_new_table = need_new_ins;
5058 598 : state->tcs_private = table;
5059 :
5060 598 : return state;
5061 : }
5062 :
5063 :
5064 : /* ----------
5065 : * AfterTriggerBeginXact()
5066 : *
5067 : * Called at transaction start (either BEGIN or implicit for single
5068 : * statement outside of transaction block).
5069 : * ----------
5070 : */
5071 : void
5072 1100820 : AfterTriggerBeginXact(void)
5073 : {
5074 : /*
5075 : * Initialize after-trigger state structure to empty
5076 : */
5077 1100820 : afterTriggers.firing_counter = (CommandId) 1; /* mustn't be 0 */
5078 1100820 : afterTriggers.query_depth = -1;
5079 :
5080 : /*
5081 : * Verify that there is no leftover state remaining. If these assertions
5082 : * trip, it means that AfterTriggerEndXact wasn't called or didn't clean
5083 : * up properly.
5084 : */
5085 : Assert(afterTriggers.state == NULL);
5086 : Assert(afterTriggers.query_stack == NULL);
5087 : Assert(afterTriggers.maxquerydepth == 0);
5088 : Assert(afterTriggers.event_cxt == NULL);
5089 : Assert(afterTriggers.events.head == NULL);
5090 : Assert(afterTriggers.trans_stack == NULL);
5091 : Assert(afterTriggers.maxtransdepth == 0);
5092 1100820 : }
5093 :
5094 :
5095 : /* ----------
5096 : * AfterTriggerBeginQuery()
5097 : *
5098 : * Called just before we start processing a single query within a
5099 : * transaction (or subtransaction). Most of the real work gets deferred
5100 : * until somebody actually tries to queue a trigger event.
5101 : * ----------
5102 : */
5103 : void
5104 421392 : AfterTriggerBeginQuery(void)
5105 : {
5106 : /* Increase the query stack depth */
5107 421392 : afterTriggers.query_depth++;
5108 421392 : }
5109 :
5110 :
5111 : /* ----------
5112 : * AfterTriggerEndQuery()
5113 : *
5114 : * Called after one query has been completely processed. At this time
5115 : * we invoke all AFTER IMMEDIATE trigger events queued by the query, and
5116 : * transfer deferred trigger events to the global deferred-trigger list.
5117 : *
5118 : * Note that this must be called BEFORE closing down the executor
5119 : * with ExecutorEnd, because we make use of the EState's info about
5120 : * target relations. Normally it is called from ExecutorFinish.
5121 : * ----------
5122 : */
5123 : void
5124 416826 : AfterTriggerEndQuery(EState *estate)
5125 : {
5126 : AfterTriggersQueryData *qs;
5127 :
5128 : /* Must be inside a query, too */
5129 : Assert(afterTriggers.query_depth >= 0);
5130 :
5131 : /*
5132 : * If we never even got as far as initializing the event stack, there
5133 : * certainly won't be any events, so exit quickly.
5134 : */
5135 416826 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
5136 : {
5137 407932 : afterTriggers.query_depth--;
5138 407932 : return;
5139 : }
5140 :
5141 : /*
5142 : * Process all immediate-mode triggers queued by the query, and move the
5143 : * deferred ones to the main list of deferred events.
5144 : *
5145 : * Notice that we decide which ones will be fired, and put the deferred
5146 : * ones on the main list, before anything is actually fired. This ensures
5147 : * reasonably sane behavior if a trigger function does SET CONSTRAINTS ...
5148 : * IMMEDIATE: all events we have decided to defer will be available for it
5149 : * to fire.
5150 : *
5151 : * We loop in case a trigger queues more events at the same query level.
5152 : * Ordinary trigger functions, including all PL/pgSQL trigger functions,
5153 : * will instead fire any triggers in a dedicated query level. Foreign key
5154 : * enforcement triggers do add to the current query level, thanks to their
5155 : * passing fire_triggers = false to SPI_execute_snapshot(). Other
5156 : * C-language triggers might do likewise.
5157 : *
5158 : * If we find no firable events, we don't have to increment
5159 : * firing_counter.
5160 : */
5161 8894 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5162 :
5163 : for (;;)
5164 : {
5165 9194 : if (afterTriggerMarkEvents(&qs->events, &afterTriggers.events, true))
5166 : {
5167 7298 : CommandId firing_id = afterTriggers.firing_counter++;
5168 7298 : AfterTriggerEventChunk *oldtail = qs->events.tail;
5169 :
5170 7298 : if (afterTriggerInvokeEvents(&qs->events, firing_id, estate, false))
5171 5870 : break; /* all fired */
5172 :
5173 : /*
5174 : * Firing a trigger could result in query_stack being repalloc'd,
5175 : * so we must recalculate qs after each afterTriggerInvokeEvents
5176 : * call. Furthermore, it's unsafe to pass delete_ok = true here,
5177 : * because that could cause afterTriggerInvokeEvents to try to
5178 : * access qs->events after the stack has been repalloc'd.
5179 : */
5180 300 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5181 :
5182 : /*
5183 : * We'll need to scan the events list again. To reduce the cost
5184 : * of doing so, get rid of completely-fired chunks. We know that
5185 : * all events were marked IN_PROGRESS or DONE at the conclusion of
5186 : * afterTriggerMarkEvents, so any still-interesting events must
5187 : * have been added after that, and so must be in the chunk that
5188 : * was then the tail chunk, or in later chunks. So, zap all
5189 : * chunks before oldtail. This is approximately the same set of
5190 : * events we would have gotten rid of by passing delete_ok = true.
5191 : */
5192 : Assert(oldtail != NULL);
5193 300 : while (qs->events.head != oldtail)
5194 0 : afterTriggerDeleteHeadEventChunk(qs);
5195 : }
5196 : else
5197 1884 : break;
5198 : }
5199 :
5200 : /* Release query-level-local storage, including tuplestores if any */
5201 7754 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5202 :
5203 7754 : afterTriggers.query_depth--;
5204 : }
5205 :
5206 :
5207 : /*
5208 : * AfterTriggerFreeQuery
5209 : * Release subsidiary storage for a trigger query level.
5210 : * This includes closing down tuplestores.
5211 : * Note: it's important for this to be safe if interrupted by an error
5212 : * and then called again for the same query level.
5213 : */
5214 : static void
5215 7784 : AfterTriggerFreeQuery(AfterTriggersQueryData *qs)
5216 : {
5217 : Tuplestorestate *ts;
5218 : List *tables;
5219 : ListCell *lc;
5220 :
5221 : /* Drop the trigger events */
5222 7784 : afterTriggerFreeEventList(&qs->events);
5223 :
5224 : /* Drop FDW tuplestore if any */
5225 7784 : ts = qs->fdw_tuplestore;
5226 7784 : qs->fdw_tuplestore = NULL;
5227 7784 : if (ts)
5228 36 : tuplestore_end(ts);
5229 :
5230 : /* Release per-table subsidiary storage */
5231 7784 : tables = qs->tables;
5232 8814 : foreach(lc, tables)
5233 : {
5234 1030 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
5235 :
5236 1030 : ts = table->old_upd_tuplestore;
5237 1030 : table->old_upd_tuplestore = NULL;
5238 1030 : if (ts)
5239 156 : tuplestore_end(ts);
5240 1030 : ts = table->new_upd_tuplestore;
5241 1030 : table->new_upd_tuplestore = NULL;
5242 1030 : if (ts)
5243 162 : tuplestore_end(ts);
5244 1030 : ts = table->old_del_tuplestore;
5245 1030 : table->old_del_tuplestore = NULL;
5246 1030 : if (ts)
5247 126 : tuplestore_end(ts);
5248 1030 : ts = table->new_ins_tuplestore;
5249 1030 : table->new_ins_tuplestore = NULL;
5250 1030 : if (ts)
5251 210 : tuplestore_end(ts);
5252 1030 : if (table->storeslot)
5253 : {
5254 84 : TupleTableSlot *slot = table->storeslot;
5255 :
5256 84 : table->storeslot = NULL;
5257 84 : ExecDropSingleTupleTableSlot(slot);
5258 : }
5259 : }
5260 :
5261 : /*
5262 : * Now free the AfterTriggersTableData structs and list cells. Reset list
5263 : * pointer first; if list_free_deep somehow gets an error, better to leak
5264 : * that storage than have an infinite loop.
5265 : */
5266 7784 : qs->tables = NIL;
5267 7784 : list_free_deep(tables);
5268 7784 : }
5269 :
5270 :
5271 : /* ----------
5272 : * AfterTriggerFireDeferred()
5273 : *
5274 : * Called just before the current transaction is committed. At this
5275 : * time we invoke all pending DEFERRED triggers.
5276 : *
5277 : * It is possible for other modules to queue additional deferred triggers
5278 : * during pre-commit processing; therefore xact.c may have to call this
5279 : * multiple times.
5280 : * ----------
5281 : */
5282 : void
5283 1062672 : AfterTriggerFireDeferred(void)
5284 : {
5285 : AfterTriggerEventList *events;
5286 1062672 : bool snap_pushed = false;
5287 :
5288 : /* Must not be inside a query */
5289 : Assert(afterTriggers.query_depth == -1);
5290 :
5291 : /*
5292 : * If there are any triggers to fire, make sure we have set a snapshot for
5293 : * them to use. (Since PortalRunUtility doesn't set a snap for COMMIT, we
5294 : * can't assume ActiveSnapshot is valid on entry.)
5295 : */
5296 1062672 : events = &afterTriggers.events;
5297 1062672 : if (events->head != NULL)
5298 : {
5299 346 : PushActiveSnapshot(GetTransactionSnapshot());
5300 346 : snap_pushed = true;
5301 : }
5302 :
5303 : /*
5304 : * Run all the remaining triggers. Loop until they are all gone, in case
5305 : * some trigger queues more for us to do.
5306 : */
5307 1062672 : while (afterTriggerMarkEvents(events, NULL, false))
5308 : {
5309 346 : CommandId firing_id = afterTriggers.firing_counter++;
5310 :
5311 346 : if (afterTriggerInvokeEvents(events, firing_id, NULL, true))
5312 192 : break; /* all fired */
5313 : }
5314 :
5315 : /*
5316 : * We don't bother freeing the event list, since it will go away anyway
5317 : * (and more efficiently than via pfree) in AfterTriggerEndXact.
5318 : */
5319 :
5320 1062518 : if (snap_pushed)
5321 192 : PopActiveSnapshot();
5322 1062518 : }
5323 :
5324 :
5325 : /* ----------
5326 : * AfterTriggerEndXact()
5327 : *
5328 : * The current transaction is finishing.
5329 : *
5330 : * Any unfired triggers are canceled so we simply throw
5331 : * away anything we know.
5332 : *
5333 : * Note: it is possible for this to be called repeatedly in case of
5334 : * error during transaction abort; therefore, do not complain if
5335 : * already closed down.
5336 : * ----------
5337 : */
5338 : void
5339 1101232 : AfterTriggerEndXact(bool isCommit)
5340 : {
5341 : /*
5342 : * Forget the pending-events list.
5343 : *
5344 : * Since all the info is in TopTransactionContext or children thereof, we
5345 : * don't really need to do anything to reclaim memory. However, the
5346 : * pending-events list could be large, and so it's useful to discard it as
5347 : * soon as possible --- especially if we are aborting because we ran out
5348 : * of memory for the list!
5349 : */
5350 1101232 : if (afterTriggers.event_cxt)
5351 : {
5352 6668 : MemoryContextDelete(afterTriggers.event_cxt);
5353 6668 : afterTriggers.event_cxt = NULL;
5354 6668 : afterTriggers.events.head = NULL;
5355 6668 : afterTriggers.events.tail = NULL;
5356 6668 : afterTriggers.events.tailfree = NULL;
5357 : }
5358 :
5359 : /*
5360 : * Forget any subtransaction state as well. Since this can't be very
5361 : * large, we let the eventual reset of TopTransactionContext free the
5362 : * memory instead of doing it here.
5363 : */
5364 1101232 : afterTriggers.trans_stack = NULL;
5365 1101232 : afterTriggers.maxtransdepth = 0;
5366 :
5367 :
5368 : /*
5369 : * Forget the query stack and constraint-related state information. As
5370 : * with the subtransaction state information, we don't bother freeing the
5371 : * memory here.
5372 : */
5373 1101232 : afterTriggers.query_stack = NULL;
5374 1101232 : afterTriggers.maxquerydepth = 0;
5375 1101232 : afterTriggers.state = NULL;
5376 :
5377 : /* No more afterTriggers manipulation until next transaction starts. */
5378 1101232 : afterTriggers.query_depth = -1;
5379 1101232 : }
5380 :
5381 : /*
5382 : * AfterTriggerBeginSubXact()
5383 : *
5384 : * Start a subtransaction.
5385 : */
5386 : void
5387 20060 : AfterTriggerBeginSubXact(void)
5388 : {
5389 20060 : int my_level = GetCurrentTransactionNestLevel();
5390 :
5391 : /*
5392 : * Allocate more space in the trans_stack if needed. (Note: because the
5393 : * minimum nest level of a subtransaction is 2, we waste the first couple
5394 : * entries of the array; not worth the notational effort to avoid it.)
5395 : */
5396 22814 : while (my_level >= afterTriggers.maxtransdepth)
5397 : {
5398 2754 : if (afterTriggers.maxtransdepth == 0)
5399 : {
5400 : /* Arbitrarily initialize for max of 8 subtransaction levels */
5401 2670 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5402 2670 : MemoryContextAlloc(TopTransactionContext,
5403 : 8 * sizeof(AfterTriggersTransData));
5404 2670 : afterTriggers.maxtransdepth = 8;
5405 : }
5406 : else
5407 : {
5408 : /* repalloc will keep the stack in the same context */
5409 84 : int new_alloc = afterTriggers.maxtransdepth * 2;
5410 :
5411 84 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5412 84 : repalloc(afterTriggers.trans_stack,
5413 : new_alloc * sizeof(AfterTriggersTransData));
5414 84 : afterTriggers.maxtransdepth = new_alloc;
5415 : }
5416 : }
5417 :
5418 : /*
5419 : * Push the current information into the stack. The SET CONSTRAINTS state
5420 : * is not saved until/unless changed. Likewise, we don't make a
5421 : * per-subtransaction event context until needed.
5422 : */
5423 20060 : afterTriggers.trans_stack[my_level].state = NULL;
5424 20060 : afterTriggers.trans_stack[my_level].events = afterTriggers.events;
5425 20060 : afterTriggers.trans_stack[my_level].query_depth = afterTriggers.query_depth;
5426 20060 : afterTriggers.trans_stack[my_level].firing_counter = afterTriggers.firing_counter;
5427 20060 : }
5428 :
5429 : /*
5430 : * AfterTriggerEndSubXact()
5431 : *
5432 : * The current subtransaction is ending.
5433 : */
5434 : void
5435 20060 : AfterTriggerEndSubXact(bool isCommit)
5436 : {
5437 20060 : int my_level = GetCurrentTransactionNestLevel();
5438 : SetConstraintState state;
5439 : AfterTriggerEvent event;
5440 : AfterTriggerEventChunk *chunk;
5441 : CommandId subxact_firing_id;
5442 :
5443 : /*
5444 : * Pop the prior state if needed.
5445 : */
5446 20060 : if (isCommit)
5447 : {
5448 : Assert(my_level < afterTriggers.maxtransdepth);
5449 : /* If we saved a prior state, we don't need it anymore */
5450 10688 : state = afterTriggers.trans_stack[my_level].state;
5451 10688 : if (state != NULL)
5452 6 : pfree(state);
5453 : /* this avoids double pfree if error later: */
5454 10688 : afterTriggers.trans_stack[my_level].state = NULL;
5455 : Assert(afterTriggers.query_depth ==
5456 : afterTriggers.trans_stack[my_level].query_depth);
5457 : }
5458 : else
5459 : {
5460 : /*
5461 : * Aborting. It is possible subxact start failed before calling
5462 : * AfterTriggerBeginSubXact, in which case we mustn't risk touching
5463 : * trans_stack levels that aren't there.
5464 : */
5465 9372 : if (my_level >= afterTriggers.maxtransdepth)
5466 0 : return;
5467 :
5468 : /*
5469 : * Release query-level storage for queries being aborted, and restore
5470 : * query_depth to its pre-subxact value. This assumes that a
5471 : * subtransaction will not add events to query levels started in a
5472 : * earlier transaction state.
5473 : */
5474 9466 : while (afterTriggers.query_depth > afterTriggers.trans_stack[my_level].query_depth)
5475 : {
5476 94 : if (afterTriggers.query_depth < afterTriggers.maxquerydepth)
5477 30 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5478 94 : afterTriggers.query_depth--;
5479 : }
5480 : Assert(afterTriggers.query_depth ==
5481 : afterTriggers.trans_stack[my_level].query_depth);
5482 :
5483 : /*
5484 : * Restore the global deferred-event list to its former length,
5485 : * discarding any events queued by the subxact.
5486 : */
5487 9372 : afterTriggerRestoreEventList(&afterTriggers.events,
5488 9372 : &afterTriggers.trans_stack[my_level].events);
5489 :
5490 : /*
5491 : * Restore the trigger state. If the saved state is NULL, then this
5492 : * subxact didn't save it, so it doesn't need restoring.
5493 : */
5494 9372 : state = afterTriggers.trans_stack[my_level].state;
5495 9372 : if (state != NULL)
5496 : {
5497 4 : pfree(afterTriggers.state);
5498 4 : afterTriggers.state = state;
5499 : }
5500 : /* this avoids double pfree if error later: */
5501 9372 : afterTriggers.trans_stack[my_level].state = NULL;
5502 :
5503 : /*
5504 : * Scan for any remaining deferred events that were marked DONE or IN
5505 : * PROGRESS by this subxact or a child, and un-mark them. We can
5506 : * recognize such events because they have a firing ID greater than or
5507 : * equal to the firing_counter value we saved at subtransaction start.
5508 : * (This essentially assumes that the current subxact includes all
5509 : * subxacts started after it.)
5510 : */
5511 9372 : subxact_firing_id = afterTriggers.trans_stack[my_level].firing_counter;
5512 9416 : for_each_event_chunk(event, chunk, afterTriggers.events)
5513 : {
5514 22 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
5515 :
5516 22 : if (event->ate_flags &
5517 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS))
5518 : {
5519 4 : if (evtshared->ats_firing_id >= subxact_firing_id)
5520 4 : event->ate_flags &=
5521 : ~(AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS);
5522 : }
5523 : }
5524 : }
5525 : }
5526 :
5527 : /*
5528 : * Get the transition table for the given event and depending on whether we are
5529 : * processing the old or the new tuple.
5530 : */
5531 : static Tuplestorestate *
5532 66126 : GetAfterTriggersTransitionTable(int event,
5533 : TupleTableSlot *oldslot,
5534 : TupleTableSlot *newslot,
5535 : TransitionCaptureState *transition_capture)
5536 : {
5537 66126 : Tuplestorestate *tuplestore = NULL;
5538 66126 : bool delete_old_table = transition_capture->tcs_delete_old_table;
5539 66126 : bool update_old_table = transition_capture->tcs_update_old_table;
5540 66126 : bool update_new_table = transition_capture->tcs_update_new_table;
5541 66126 : bool insert_new_table = transition_capture->tcs_insert_new_table;
5542 :
5543 : /*
5544 : * For INSERT events NEW should be non-NULL, for DELETE events OLD should
5545 : * be non-NULL, whereas for UPDATE events normally both OLD and NEW are
5546 : * non-NULL. But for UPDATE events fired for capturing transition tuples
5547 : * during UPDATE partition-key row movement, OLD is NULL when the event is
5548 : * for a row being inserted, whereas NEW is NULL when the event is for a
5549 : * row being deleted.
5550 : */
5551 : Assert(!(event == TRIGGER_EVENT_DELETE && delete_old_table &&
5552 : TupIsNull(oldslot)));
5553 : Assert(!(event == TRIGGER_EVENT_INSERT && insert_new_table &&
5554 : TupIsNull(newslot)));
5555 :
5556 66126 : if (!TupIsNull(oldslot))
5557 : {
5558 : Assert(TupIsNull(newslot));
5559 5412 : if (event == TRIGGER_EVENT_DELETE && delete_old_table)
5560 5052 : tuplestore = transition_capture->tcs_private->old_del_tuplestore;
5561 360 : else if (event == TRIGGER_EVENT_UPDATE && update_old_table)
5562 336 : tuplestore = transition_capture->tcs_private->old_upd_tuplestore;
5563 : }
5564 60714 : else if (!TupIsNull(newslot))
5565 : {
5566 : Assert(TupIsNull(oldslot));
5567 60714 : if (event == TRIGGER_EVENT_INSERT && insert_new_table)
5568 60354 : tuplestore = transition_capture->tcs_private->new_ins_tuplestore;
5569 360 : else if (event == TRIGGER_EVENT_UPDATE && update_new_table)
5570 354 : tuplestore = transition_capture->tcs_private->new_upd_tuplestore;
5571 : }
5572 :
5573 66126 : return tuplestore;
5574 : }
5575 :
5576 : /*
5577 : * Add the given heap tuple to the given tuplestore, applying the conversion
5578 : * map if necessary.
5579 : *
5580 : * If original_insert_tuple is given, we can add that tuple without conversion.
5581 : */
5582 : static void
5583 66126 : TransitionTableAddTuple(EState *estate,
5584 : TransitionCaptureState *transition_capture,
5585 : ResultRelInfo *relinfo,
5586 : TupleTableSlot *slot,
5587 : TupleTableSlot *original_insert_tuple,
5588 : Tuplestorestate *tuplestore)
5589 : {
5590 : TupleConversionMap *map;
5591 :
5592 : /*
5593 : * Nothing needs to be done if we don't have a tuplestore.
5594 : */
5595 66126 : if (tuplestore == NULL)
5596 30 : return;
5597 :
5598 66096 : if (original_insert_tuple)
5599 144 : tuplestore_puttupleslot(tuplestore, original_insert_tuple);
5600 65952 : else if ((map = ExecGetChildToRootMap(relinfo)) != NULL)
5601 : {
5602 294 : AfterTriggersTableData *table = transition_capture->tcs_private;
5603 : TupleTableSlot *storeslot;
5604 :
5605 294 : storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
5606 294 : execute_attr_map_slot(map->attrMap, slot, storeslot);
5607 294 : tuplestore_puttupleslot(tuplestore, storeslot);
5608 : }
5609 : else
5610 65658 : tuplestore_puttupleslot(tuplestore, slot);
5611 : }
5612 :
5613 : /* ----------
5614 : * AfterTriggerEnlargeQueryState()
5615 : *
5616 : * Prepare the necessary state so that we can record AFTER trigger events
5617 : * queued by a query. It is allowed to have nested queries within a
5618 : * (sub)transaction, so we need to have separate state for each query
5619 : * nesting level.
5620 : * ----------
5621 : */
5622 : static void
5623 7038 : AfterTriggerEnlargeQueryState(void)
5624 : {
5625 7038 : int init_depth = afterTriggers.maxquerydepth;
5626 :
5627 : Assert(afterTriggers.query_depth >= afterTriggers.maxquerydepth);
5628 :
5629 7038 : if (afterTriggers.maxquerydepth == 0)
5630 : {
5631 7038 : int new_alloc = Max(afterTriggers.query_depth + 1, 8);
5632 :
5633 7038 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5634 7038 : MemoryContextAlloc(TopTransactionContext,
5635 : new_alloc * sizeof(AfterTriggersQueryData));
5636 7038 : afterTriggers.maxquerydepth = new_alloc;
5637 : }
5638 : else
5639 : {
5640 : /* repalloc will keep the stack in the same context */
5641 0 : int old_alloc = afterTriggers.maxquerydepth;
5642 0 : int new_alloc = Max(afterTriggers.query_depth + 1,
5643 : old_alloc * 2);
5644 :
5645 0 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5646 0 : repalloc(afterTriggers.query_stack,
5647 : new_alloc * sizeof(AfterTriggersQueryData));
5648 0 : afterTriggers.maxquerydepth = new_alloc;
5649 : }
5650 :
5651 : /* Initialize new array entries to empty */
5652 63342 : while (init_depth < afterTriggers.maxquerydepth)
5653 : {
5654 56304 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[init_depth];
5655 :
5656 56304 : qs->events.head = NULL;
5657 56304 : qs->events.tail = NULL;
5658 56304 : qs->events.tailfree = NULL;
5659 56304 : qs->fdw_tuplestore = NULL;
5660 56304 : qs->tables = NIL;
5661 :
5662 56304 : ++init_depth;
5663 : }
5664 7038 : }
5665 :
5666 : /*
5667 : * Create an empty SetConstraintState with room for numalloc trigstates
5668 : */
5669 : static SetConstraintState
5670 96 : SetConstraintStateCreate(int numalloc)
5671 : {
5672 : SetConstraintState state;
5673 :
5674 : /* Behave sanely with numalloc == 0 */
5675 96 : if (numalloc <= 0)
5676 10 : numalloc = 1;
5677 :
5678 : /*
5679 : * We assume that zeroing will correctly initialize the state values.
5680 : */
5681 : state = (SetConstraintState)
5682 96 : MemoryContextAllocZero(TopTransactionContext,
5683 : offsetof(SetConstraintStateData, trigstates) +
5684 96 : numalloc * sizeof(SetConstraintTriggerData));
5685 :
5686 96 : state->numalloc = numalloc;
5687 :
5688 96 : return state;
5689 : }
5690 :
5691 : /*
5692 : * Copy a SetConstraintState
5693 : */
5694 : static SetConstraintState
5695 10 : SetConstraintStateCopy(SetConstraintState origstate)
5696 : {
5697 : SetConstraintState state;
5698 :
5699 10 : state = SetConstraintStateCreate(origstate->numstates);
5700 :
5701 10 : state->all_isset = origstate->all_isset;
5702 10 : state->all_isdeferred = origstate->all_isdeferred;
5703 10 : state->numstates = origstate->numstates;
5704 10 : memcpy(state->trigstates, origstate->trigstates,
5705 10 : origstate->numstates * sizeof(SetConstraintTriggerData));
5706 :
5707 10 : return state;
5708 : }
5709 :
5710 : /*
5711 : * Add a per-trigger item to a SetConstraintState. Returns possibly-changed
5712 : * pointer to the state object (it will change if we have to repalloc).
5713 : */
5714 : static SetConstraintState
5715 342 : SetConstraintStateAddItem(SetConstraintState state,
5716 : Oid tgoid, bool tgisdeferred)
5717 : {
5718 342 : if (state->numstates >= state->numalloc)
5719 : {
5720 30 : int newalloc = state->numalloc * 2;
5721 :
5722 30 : newalloc = Max(newalloc, 8); /* in case original has size 0 */
5723 : state = (SetConstraintState)
5724 30 : repalloc(state,
5725 : offsetof(SetConstraintStateData, trigstates) +
5726 30 : newalloc * sizeof(SetConstraintTriggerData));
5727 30 : state->numalloc = newalloc;
5728 : Assert(state->numstates < state->numalloc);
5729 : }
5730 :
5731 342 : state->trigstates[state->numstates].sct_tgoid = tgoid;
5732 342 : state->trigstates[state->numstates].sct_tgisdeferred = tgisdeferred;
5733 342 : state->numstates++;
5734 :
5735 342 : return state;
5736 : }
5737 :
5738 : /* ----------
5739 : * AfterTriggerSetState()
5740 : *
5741 : * Execute the SET CONSTRAINTS ... utility command.
5742 : * ----------
5743 : */
5744 : void
5745 102 : AfterTriggerSetState(ConstraintsSetStmt *stmt)
5746 : {
5747 102 : int my_level = GetCurrentTransactionNestLevel();
5748 :
5749 : /* If we haven't already done so, initialize our state. */
5750 102 : if (afterTriggers.state == NULL)
5751 86 : afterTriggers.state = SetConstraintStateCreate(8);
5752 :
5753 : /*
5754 : * If in a subtransaction, and we didn't save the current state already,
5755 : * save it so it can be restored if the subtransaction aborts.
5756 : */
5757 102 : if (my_level > 1 &&
5758 10 : afterTriggers.trans_stack[my_level].state == NULL)
5759 : {
5760 10 : afterTriggers.trans_stack[my_level].state =
5761 10 : SetConstraintStateCopy(afterTriggers.state);
5762 : }
5763 :
5764 : /*
5765 : * Handle SET CONSTRAINTS ALL ...
5766 : */
5767 102 : if (stmt->constraints == NIL)
5768 : {
5769 : /*
5770 : * Forget any previous SET CONSTRAINTS commands in this transaction.
5771 : */
5772 54 : afterTriggers.state->numstates = 0;
5773 :
5774 : /*
5775 : * Set the per-transaction ALL state to known.
5776 : */
5777 54 : afterTriggers.state->all_isset = true;
5778 54 : afterTriggers.state->all_isdeferred = stmt->deferred;
5779 : }
5780 : else
5781 : {
5782 : Relation conrel;
5783 : Relation tgrel;
5784 48 : List *conoidlist = NIL;
5785 48 : List *tgoidlist = NIL;
5786 : ListCell *lc;
5787 :
5788 : /*
5789 : * Handle SET CONSTRAINTS constraint-name [, ...]
5790 : *
5791 : * First, identify all the named constraints and make a list of their
5792 : * OIDs. Since, unlike the SQL spec, we allow multiple constraints of
5793 : * the same name within a schema, the specifications are not
5794 : * necessarily unique. Our strategy is to target all matching
5795 : * constraints within the first search-path schema that has any
5796 : * matches, but disregard matches in schemas beyond the first match.
5797 : * (This is a bit odd but it's the historical behavior.)
5798 : *
5799 : * A constraint in a partitioned table may have corresponding
5800 : * constraints in the partitions. Grab those too.
5801 : */
5802 48 : conrel = table_open(ConstraintRelationId, AccessShareLock);
5803 :
5804 96 : foreach(lc, stmt->constraints)
5805 : {
5806 48 : RangeVar *constraint = lfirst(lc);
5807 : bool found;
5808 : List *namespacelist;
5809 : ListCell *nslc;
5810 :
5811 48 : if (constraint->catalogname)
5812 : {
5813 0 : if (strcmp(constraint->catalogname, get_database_name(MyDatabaseId)) != 0)
5814 0 : ereport(ERROR,
5815 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5816 : errmsg("cross-database references are not implemented: \"%s.%s.%s\"",
5817 : constraint->catalogname, constraint->schemaname,
5818 : constraint->relname)));
5819 : }
5820 :
5821 : /*
5822 : * If we're given the schema name with the constraint, look only
5823 : * in that schema. If given a bare constraint name, use the
5824 : * search path to find the first matching constraint.
5825 : */
5826 48 : if (constraint->schemaname)
5827 : {
5828 12 : Oid namespaceId = LookupExplicitNamespace(constraint->schemaname,
5829 : false);
5830 :
5831 12 : namespacelist = list_make1_oid(namespaceId);
5832 : }
5833 : else
5834 : {
5835 36 : namespacelist = fetch_search_path(true);
5836 : }
5837 :
5838 48 : found = false;
5839 120 : foreach(nslc, namespacelist)
5840 : {
5841 120 : Oid namespaceId = lfirst_oid(nslc);
5842 : SysScanDesc conscan;
5843 : ScanKeyData skey[2];
5844 : HeapTuple tup;
5845 :
5846 120 : ScanKeyInit(&skey[0],
5847 : Anum_pg_constraint_conname,
5848 : BTEqualStrategyNumber, F_NAMEEQ,
5849 120 : CStringGetDatum(constraint->relname));
5850 120 : ScanKeyInit(&skey[1],
5851 : Anum_pg_constraint_connamespace,
5852 : BTEqualStrategyNumber, F_OIDEQ,
5853 : ObjectIdGetDatum(namespaceId));
5854 :
5855 120 : conscan = systable_beginscan(conrel, ConstraintNameNspIndexId,
5856 : true, NULL, 2, skey);
5857 :
5858 216 : while (HeapTupleIsValid(tup = systable_getnext(conscan)))
5859 : {
5860 96 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);
5861 :
5862 96 : if (con->condeferrable)
5863 96 : conoidlist = lappend_oid(conoidlist, con->oid);
5864 0 : else if (stmt->deferred)
5865 0 : ereport(ERROR,
5866 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
5867 : errmsg("constraint \"%s\" is not deferrable",
5868 : constraint->relname)));
5869 96 : found = true;
5870 : }
5871 :
5872 120 : systable_endscan(conscan);
5873 :
5874 : /*
5875 : * Once we've found a matching constraint we do not search
5876 : * later parts of the search path.
5877 : */
5878 120 : if (found)
5879 48 : break;
5880 : }
5881 :
5882 48 : list_free(namespacelist);
5883 :
5884 : /*
5885 : * Not found ?
5886 : */
5887 48 : if (!found)
5888 0 : ereport(ERROR,
5889 : (errcode(ERRCODE_UNDEFINED_OBJECT),
5890 : errmsg("constraint \"%s\" does not exist",
5891 : constraint->relname)));
5892 : }
5893 :
5894 : /*
5895 : * Scan for any possible descendants of the constraints. We append
5896 : * whatever we find to the same list that we're scanning; this has the
5897 : * effect that we create new scans for those, too, so if there are
5898 : * further descendents, we'll also catch them.
5899 : */
5900 258 : foreach(lc, conoidlist)
5901 : {
5902 210 : Oid parent = lfirst_oid(lc);
5903 : ScanKeyData key;
5904 : SysScanDesc scan;
5905 : HeapTuple tuple;
5906 :
5907 210 : ScanKeyInit(&key,
5908 : Anum_pg_constraint_conparentid,
5909 : BTEqualStrategyNumber, F_OIDEQ,
5910 : ObjectIdGetDatum(parent));
5911 :
5912 210 : scan = systable_beginscan(conrel, ConstraintParentIndexId, true, NULL, 1, &key);
5913 :
5914 324 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
5915 : {
5916 114 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
5917 :
5918 114 : conoidlist = lappend_oid(conoidlist, con->oid);
5919 : }
5920 :
5921 210 : systable_endscan(scan);
5922 : }
5923 :
5924 48 : table_close(conrel, AccessShareLock);
5925 :
5926 : /*
5927 : * Now, locate the trigger(s) implementing each of these constraints,
5928 : * and make a list of their OIDs.
5929 : */
5930 48 : tgrel = table_open(TriggerRelationId, AccessShareLock);
5931 :
5932 258 : foreach(lc, conoidlist)
5933 : {
5934 210 : Oid conoid = lfirst_oid(lc);
5935 : ScanKeyData skey;
5936 : SysScanDesc tgscan;
5937 : HeapTuple htup;
5938 :
5939 210 : ScanKeyInit(&skey,
5940 : Anum_pg_trigger_tgconstraint,
5941 : BTEqualStrategyNumber, F_OIDEQ,
5942 : ObjectIdGetDatum(conoid));
5943 :
5944 210 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
5945 : NULL, 1, &skey);
5946 :
5947 858 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
5948 : {
5949 438 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
5950 :
5951 : /*
5952 : * Silently skip triggers that are marked as non-deferrable in
5953 : * pg_trigger. This is not an error condition, since a
5954 : * deferrable RI constraint may have some non-deferrable
5955 : * actions.
5956 : */
5957 438 : if (pg_trigger->tgdeferrable)
5958 438 : tgoidlist = lappend_oid(tgoidlist, pg_trigger->oid);
5959 : }
5960 :
5961 210 : systable_endscan(tgscan);
5962 : }
5963 :
5964 48 : table_close(tgrel, AccessShareLock);
5965 :
5966 : /*
5967 : * Now we can set the trigger states of individual triggers for this
5968 : * xact.
5969 : */
5970 486 : foreach(lc, tgoidlist)
5971 : {
5972 438 : Oid tgoid = lfirst_oid(lc);
5973 438 : SetConstraintState state = afterTriggers.state;
5974 438 : bool found = false;
5975 : int i;
5976 :
5977 2448 : for (i = 0; i < state->numstates; i++)
5978 : {
5979 2106 : if (state->trigstates[i].sct_tgoid == tgoid)
5980 : {
5981 96 : state->trigstates[i].sct_tgisdeferred = stmt->deferred;
5982 96 : found = true;
5983 96 : break;
5984 : }
5985 : }
5986 438 : if (!found)
5987 : {
5988 342 : afterTriggers.state =
5989 342 : SetConstraintStateAddItem(state, tgoid, stmt->deferred);
5990 : }
5991 : }
5992 : }
5993 :
5994 : /*
5995 : * SQL99 requires that when a constraint is set to IMMEDIATE, any deferred
5996 : * checks against that constraint must be made when the SET CONSTRAINTS
5997 : * command is executed -- i.e. the effects of the SET CONSTRAINTS command
5998 : * apply retroactively. We've updated the constraints state, so scan the
5999 : * list of previously deferred events to fire any that have now become
6000 : * immediate.
6001 : *
6002 : * Obviously, if this was SET ... DEFERRED then it can't have converted
6003 : * any unfired events to immediate, so we need do nothing in that case.
6004 : */
6005 102 : if (!stmt->deferred)
6006 : {
6007 34 : AfterTriggerEventList *events = &afterTriggers.events;
6008 34 : bool snapshot_set = false;
6009 :
6010 34 : while (afterTriggerMarkEvents(events, NULL, true))
6011 : {
6012 16 : CommandId firing_id = afterTriggers.firing_counter++;
6013 :
6014 : /*
6015 : * Make sure a snapshot has been established in case trigger
6016 : * functions need one. Note that we avoid setting a snapshot if
6017 : * we don't find at least one trigger that has to be fired now.
6018 : * This is so that BEGIN; SET CONSTRAINTS ...; SET TRANSACTION
6019 : * ISOLATION LEVEL SERIALIZABLE; ... works properly. (If we are
6020 : * at the start of a transaction it's not possible for any trigger
6021 : * events to be queued yet.)
6022 : */
6023 16 : if (!snapshot_set)
6024 : {
6025 16 : PushActiveSnapshot(GetTransactionSnapshot());
6026 16 : snapshot_set = true;
6027 : }
6028 :
6029 : /*
6030 : * We can delete fired events if we are at top transaction level,
6031 : * but we'd better not if inside a subtransaction, since the
6032 : * subtransaction could later get rolled back.
6033 : */
6034 0 : if (afterTriggerInvokeEvents(events, firing_id, NULL,
6035 16 : !IsSubTransaction()))
6036 0 : break; /* all fired */
6037 : }
6038 :
6039 18 : if (snapshot_set)
6040 0 : PopActiveSnapshot();
6041 : }
6042 86 : }
6043 :
6044 : /* ----------
6045 : * AfterTriggerPendingOnRel()
6046 : * Test to see if there are any pending after-trigger events for rel.
6047 : *
6048 : * This is used by TRUNCATE, CLUSTER, ALTER TABLE, etc to detect whether
6049 : * it is unsafe to perform major surgery on a relation. Note that only
6050 : * local pending events are examined. We assume that having exclusive lock
6051 : * on a rel guarantees there are no unserviced events in other backends ---
6052 : * but having a lock does not prevent there being such events in our own.
6053 : *
6054 : * In some scenarios it'd be reasonable to remove pending events (more
6055 : * specifically, mark them DONE by the current subxact) but without a lot
6056 : * of knowledge of the trigger semantics we can't do this in general.
6057 : * ----------
6058 : */
6059 : bool
6060 136984 : AfterTriggerPendingOnRel(Oid relid)
6061 : {
6062 : AfterTriggerEvent event;
6063 : AfterTriggerEventChunk *chunk;
6064 : int depth;
6065 :
6066 : /* Scan queued events */
6067 137020 : for_each_event_chunk(event, chunk, afterTriggers.events)
6068 : {
6069 36 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6070 :
6071 : /*
6072 : * We can ignore completed events. (Even if a DONE flag is rolled
6073 : * back by subxact abort, it's OK because the effects of the TRUNCATE
6074 : * or whatever must get rolled back too.)
6075 : */
6076 36 : if (event->ate_flags & AFTER_TRIGGER_DONE)
6077 0 : continue;
6078 :
6079 36 : if (evtshared->ats_relid == relid)
6080 18 : return true;
6081 : }
6082 :
6083 : /*
6084 : * Also scan events queued by incomplete queries. This could only matter
6085 : * if TRUNCATE/etc is executed by a function or trigger within an updating
6086 : * query on the same relation, which is pretty perverse, but let's check.
6087 : */
6088 136966 : for (depth = 0; depth <= afterTriggers.query_depth && depth < afterTriggers.maxquerydepth; depth++)
6089 : {
6090 0 : for_each_event_chunk(event, chunk, afterTriggers.query_stack[depth].events)
6091 : {
6092 0 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6093 :
6094 0 : if (event->ate_flags & AFTER_TRIGGER_DONE)
6095 0 : continue;
6096 :
6097 0 : if (evtshared->ats_relid == relid)
6098 0 : return true;
6099 : }
6100 : }
6101 :
6102 136966 : return false;
6103 : }
6104 :
6105 : /* ----------
6106 : * AfterTriggerSaveEvent()
6107 : *
6108 : * Called by ExecA[RS]...Triggers() to queue up the triggers that should
6109 : * be fired for an event.
6110 : *
6111 : * NOTE: this is called whenever there are any triggers associated with
6112 : * the event (even if they are disabled). This function decides which
6113 : * triggers actually need to be queued. It is also called after each row,
6114 : * even if there are no triggers for that event, if there are any AFTER
6115 : * STATEMENT triggers for the statement which use transition tables, so that
6116 : * the transition tuplestores can be built. Furthermore, if the transition
6117 : * capture is happening for UPDATEd rows being moved to another partition due
6118 : * to the partition-key being changed, then this function is called once when
6119 : * the row is deleted (to capture OLD row), and once when the row is inserted
6120 : * into another partition (to capture NEW row). This is done separately because
6121 : * DELETE and INSERT happen on different tables.
6122 : *
6123 : * Transition tuplestores are built now, rather than when events are pulled
6124 : * off of the queue because AFTER ROW triggers are allowed to select from the
6125 : * transition tables for the statement.
6126 : *
6127 : * This contains special support to queue the update events for the case where
6128 : * a partitioned table undergoing a cross-partition update may have foreign
6129 : * keys pointing into it. Normally, a partitioned table's row triggers are
6130 : * not fired because the leaf partition(s) which are modified as a result of
6131 : * the operation on the partitioned table contain the same triggers which are
6132 : * fired instead. But that general scheme can cause problematic behavior with
6133 : * foreign key triggers during cross-partition updates, which are implemented
6134 : * as DELETE on the source partition followed by INSERT into the destination
6135 : * partition. Specifically, firing DELETE triggers would lead to the wrong
6136 : * foreign key action to be enforced considering that the original command is
6137 : * UPDATE; in this case, this function is called with relinfo as the
6138 : * partitioned table, and src_partinfo and dst_partinfo referring to the
6139 : * source and target leaf partitions, respectively.
6140 : *
6141 : * is_crosspart_update is true either when a DELETE event is fired on the
6142 : * source partition (which is to be ignored) or an UPDATE event is fired on
6143 : * the root partitioned table.
6144 : * ----------
6145 : */
6146 : static void
6147 76738 : AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
6148 : ResultRelInfo *src_partinfo,
6149 : ResultRelInfo *dst_partinfo,
6150 : int event, bool row_trigger,
6151 : TupleTableSlot *oldslot, TupleTableSlot *newslot,
6152 : List *recheckIndexes, Bitmapset *modifiedCols,
6153 : TransitionCaptureState *transition_capture,
6154 : bool is_crosspart_update)
6155 : {
6156 76738 : Relation rel = relinfo->ri_RelationDesc;
6157 76738 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
6158 : AfterTriggerEventData new_event;
6159 : AfterTriggerSharedData new_shared;
6160 76738 : char relkind = rel->rd_rel->relkind;
6161 : int tgtype_event;
6162 : int tgtype_level;
6163 : int i;
6164 76738 : Tuplestorestate *fdw_tuplestore = NULL;
6165 :
6166 : /*
6167 : * Check state. We use a normal test not Assert because it is possible to
6168 : * reach here in the wrong state given misconfigured RI triggers, in
6169 : * particular deferring a cascade action trigger.
6170 : */
6171 76738 : if (afterTriggers.query_depth < 0)
6172 0 : elog(ERROR, "AfterTriggerSaveEvent() called outside of query");
6173 :
6174 : /* Be sure we have enough space to record events at this query depth. */
6175 76738 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6176 6248 : AfterTriggerEnlargeQueryState();
6177 :
6178 : /*
6179 : * If the directly named relation has any triggers with transition tables,
6180 : * then we need to capture transition tuples.
6181 : */
6182 76738 : if (row_trigger && transition_capture != NULL)
6183 : {
6184 65814 : TupleTableSlot *original_insert_tuple = transition_capture->tcs_original_insert_tuple;
6185 :
6186 : /*
6187 : * Capture the old tuple in the appropriate transition table based on
6188 : * the event.
6189 : */
6190 65814 : if (!TupIsNull(oldslot))
6191 : {
6192 : Tuplestorestate *old_tuplestore;
6193 :
6194 5412 : old_tuplestore = GetAfterTriggersTransitionTable(event,
6195 : oldslot,
6196 : NULL,
6197 : transition_capture);
6198 5412 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6199 : oldslot, NULL, old_tuplestore);
6200 : }
6201 :
6202 : /*
6203 : * Capture the new tuple in the appropriate transition table based on
6204 : * the event.
6205 : */
6206 65814 : if (!TupIsNull(newslot))
6207 : {
6208 : Tuplestorestate *new_tuplestore;
6209 :
6210 60714 : new_tuplestore = GetAfterTriggersTransitionTable(event,
6211 : NULL,
6212 : newslot,
6213 : transition_capture);
6214 60714 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6215 : newslot, original_insert_tuple, new_tuplestore);
6216 : }
6217 :
6218 : /*
6219 : * If transition tables are the only reason we're here, return. As
6220 : * mentioned above, we can also be here during update tuple routing in
6221 : * presence of transition tables, in which case this function is
6222 : * called separately for OLD and NEW, so we expect exactly one of them
6223 : * to be NULL.
6224 : */
6225 65814 : if (trigdesc == NULL ||
6226 65574 : (event == TRIGGER_EVENT_DELETE && !trigdesc->trig_delete_after_row) ||
6227 60594 : (event == TRIGGER_EVENT_INSERT && !trigdesc->trig_insert_after_row) ||
6228 354 : (event == TRIGGER_EVENT_UPDATE && !trigdesc->trig_update_after_row) ||
6229 36 : (event == TRIGGER_EVENT_UPDATE && (TupIsNull(oldslot) ^ TupIsNull(newslot))))
6230 65700 : return;
6231 : }
6232 :
6233 : /*
6234 : * We normally don't see partitioned tables here for row level triggers
6235 : * except in the special case of a cross-partition update. In that case,
6236 : * nodeModifyTable.c:ExecCrossPartitionUpdateForeignKey() calls here to
6237 : * queue an update event on the root target partitioned table, also
6238 : * passing the source and destination partitions and their tuples.
6239 : */
6240 : Assert(!row_trigger ||
6241 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE ||
6242 : (is_crosspart_update &&
6243 : TRIGGER_FIRED_BY_UPDATE(event) &&
6244 : src_partinfo != NULL && dst_partinfo != NULL));
6245 :
6246 : /*
6247 : * Validate the event code and collect the associated tuple CTIDs.
6248 : *
6249 : * The event code will be used both as a bitmask and an array offset, so
6250 : * validation is important to make sure we don't walk off the edge of our
6251 : * arrays.
6252 : *
6253 : * Also, if we're considering statement-level triggers, check whether we
6254 : * already queued a set of them for this event, and cancel the prior set
6255 : * if so. This preserves the behavior that statement-level triggers fire
6256 : * just once per statement and fire after row-level triggers.
6257 : */
6258 11038 : switch (event)
6259 : {
6260 5818 : case TRIGGER_EVENT_INSERT:
6261 5818 : tgtype_event = TRIGGER_TYPE_INSERT;
6262 5818 : if (row_trigger)
6263 : {
6264 : Assert(oldslot == NULL);
6265 : Assert(newslot != NULL);
6266 5376 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid1));
6267 5376 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6268 : }
6269 : else
6270 : {
6271 : Assert(oldslot == NULL);
6272 : Assert(newslot == NULL);
6273 442 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6274 442 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6275 442 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6276 : CMD_INSERT, event);
6277 : }
6278 5818 : break;
6279 1430 : case TRIGGER_EVENT_DELETE:
6280 1430 : tgtype_event = TRIGGER_TYPE_DELETE;
6281 1430 : if (row_trigger)
6282 : {
6283 : Assert(oldslot != NULL);
6284 : Assert(newslot == NULL);
6285 1194 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6286 1194 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6287 : }
6288 : else
6289 : {
6290 : Assert(oldslot == NULL);
6291 : Assert(newslot == NULL);
6292 236 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6293 236 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6294 236 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6295 : CMD_DELETE, event);
6296 : }
6297 1430 : break;
6298 3782 : case TRIGGER_EVENT_UPDATE:
6299 3782 : tgtype_event = TRIGGER_TYPE_UPDATE;
6300 3782 : if (row_trigger)
6301 : {
6302 : Assert(oldslot != NULL);
6303 : Assert(newslot != NULL);
6304 3374 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6305 3374 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid2));
6306 :
6307 : /*
6308 : * Also remember the OIDs of partitions to fetch these tuples
6309 : * out of later in AfterTriggerExecute().
6310 : */
6311 3374 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6312 : {
6313 : Assert(src_partinfo != NULL && dst_partinfo != NULL);
6314 282 : new_event.ate_src_part =
6315 282 : RelationGetRelid(src_partinfo->ri_RelationDesc);
6316 282 : new_event.ate_dst_part =
6317 282 : RelationGetRelid(dst_partinfo->ri_RelationDesc);
6318 : }
6319 : }
6320 : else
6321 : {
6322 : Assert(oldslot == NULL);
6323 : Assert(newslot == NULL);
6324 408 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6325 408 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6326 408 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6327 : CMD_UPDATE, event);
6328 : }
6329 3782 : break;
6330 8 : case TRIGGER_EVENT_TRUNCATE:
6331 8 : tgtype_event = TRIGGER_TYPE_TRUNCATE;
6332 : Assert(oldslot == NULL);
6333 : Assert(newslot == NULL);
6334 8 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6335 8 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6336 8 : break;
6337 0 : default:
6338 0 : elog(ERROR, "invalid after-trigger event code: %d", event);
6339 : tgtype_event = 0; /* keep compiler quiet */
6340 : break;
6341 : }
6342 :
6343 : /* Determine flags */
6344 11038 : if (!(relkind == RELKIND_FOREIGN_TABLE && row_trigger))
6345 : {
6346 10982 : if (row_trigger && event == TRIGGER_EVENT_UPDATE)
6347 : {
6348 3354 : if (relkind == RELKIND_PARTITIONED_TABLE)
6349 282 : new_event.ate_flags = AFTER_TRIGGER_CP_UPDATE;
6350 : else
6351 3072 : new_event.ate_flags = AFTER_TRIGGER_2CTID;
6352 : }
6353 : else
6354 7628 : new_event.ate_flags = AFTER_TRIGGER_1CTID;
6355 : }
6356 :
6357 : /* else, we'll initialize ate_flags for each trigger */
6358 :
6359 11038 : tgtype_level = (row_trigger ? TRIGGER_TYPE_ROW : TRIGGER_TYPE_STATEMENT);
6360 :
6361 : /*
6362 : * Must convert/copy the source and destination partition tuples into the
6363 : * root partitioned table's format/slot, because the processing in the
6364 : * loop below expects both oldslot and newslot tuples to be in that form.
6365 : */
6366 11038 : if (row_trigger && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6367 : {
6368 : TupleTableSlot *rootslot;
6369 : TupleConversionMap *map;
6370 :
6371 282 : rootslot = ExecGetTriggerOldSlot(estate, relinfo);
6372 282 : map = ExecGetChildToRootMap(src_partinfo);
6373 282 : if (map)
6374 36 : oldslot = execute_attr_map_slot(map->attrMap,
6375 : oldslot,
6376 : rootslot);
6377 : else
6378 246 : oldslot = ExecCopySlot(rootslot, oldslot);
6379 :
6380 282 : rootslot = ExecGetTriggerNewSlot(estate, relinfo);
6381 282 : map = ExecGetChildToRootMap(dst_partinfo);
6382 282 : if (map)
6383 36 : newslot = execute_attr_map_slot(map->attrMap,
6384 : newslot,
6385 : rootslot);
6386 : else
6387 246 : newslot = ExecCopySlot(rootslot, newslot);
6388 : }
6389 :
6390 50460 : for (i = 0; i < trigdesc->numtriggers; i++)
6391 : {
6392 39422 : Trigger *trigger = &trigdesc->triggers[i];
6393 :
6394 39422 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
6395 : tgtype_level,
6396 : TRIGGER_TYPE_AFTER,
6397 : tgtype_event))
6398 25368 : continue;
6399 14054 : if (!TriggerEnabled(estate, relinfo, trigger, event,
6400 : modifiedCols, oldslot, newslot))
6401 422 : continue;
6402 :
6403 13632 : if (relkind == RELKIND_FOREIGN_TABLE && row_trigger)
6404 : {
6405 58 : if (fdw_tuplestore == NULL)
6406 : {
6407 50 : fdw_tuplestore = GetCurrentFDWTuplestore();
6408 50 : new_event.ate_flags = AFTER_TRIGGER_FDW_FETCH;
6409 : }
6410 : else
6411 : /* subsequent event for the same tuple */
6412 8 : new_event.ate_flags = AFTER_TRIGGER_FDW_REUSE;
6413 : }
6414 :
6415 : /*
6416 : * If the trigger is a foreign key enforcement trigger, there are
6417 : * certain cases where we can skip queueing the event because we can
6418 : * tell by inspection that the FK constraint will still pass. There
6419 : * are also some cases during cross-partition updates of a partitioned
6420 : * table where queuing the event can be skipped.
6421 : */
6422 13632 : if (TRIGGER_FIRED_BY_UPDATE(event) || TRIGGER_FIRED_BY_DELETE(event))
6423 : {
6424 6634 : switch (RI_FKey_trigger_type(trigger->tgfoid))
6425 : {
6426 2626 : case RI_TRIGGER_PK:
6427 :
6428 : /*
6429 : * For cross-partitioned updates of partitioned PK table,
6430 : * skip the event fired by the component delete on the
6431 : * source leaf partition unless the constraint originates
6432 : * in the partition itself (!tgisclone), because the
6433 : * update event that will be fired on the root
6434 : * (partitioned) target table will be used to perform the
6435 : * necessary foreign key enforcement action.
6436 : */
6437 2626 : if (is_crosspart_update &&
6438 498 : TRIGGER_FIRED_BY_DELETE(event) &&
6439 264 : trigger->tgisclone)
6440 246 : continue;
6441 :
6442 : /* Update or delete on trigger's PK table */
6443 2380 : if (!RI_FKey_pk_upd_check_required(trigger, rel,
6444 : oldslot, newslot))
6445 : {
6446 : /* skip queuing this event */
6447 542 : continue;
6448 : }
6449 1838 : break;
6450 :
6451 1194 : case RI_TRIGGER_FK:
6452 :
6453 : /*
6454 : * Update on trigger's FK table. We can skip the update
6455 : * event fired on a partitioned table during a
6456 : * cross-partition of that table, because the insert event
6457 : * that is fired on the destination leaf partition would
6458 : * suffice to perform the necessary foreign key check.
6459 : * Moreover, RI_FKey_fk_upd_check_required() expects to be
6460 : * passed a tuple that contains system attributes, most of
6461 : * which are not present in the virtual slot belonging to
6462 : * a partitioned table.
6463 : */
6464 1194 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
6465 1080 : !RI_FKey_fk_upd_check_required(trigger, rel,
6466 : oldslot, newslot))
6467 : {
6468 : /* skip queuing this event */
6469 728 : continue;
6470 : }
6471 466 : break;
6472 :
6473 2814 : case RI_TRIGGER_NONE:
6474 :
6475 : /*
6476 : * Not an FK trigger. No need to queue the update event
6477 : * fired during a cross-partitioned update of a
6478 : * partitioned table, because the same row trigger must be
6479 : * present in the leaf partition(s) that are affected as
6480 : * part of this update and the events fired on them are
6481 : * queued instead.
6482 : */
6483 2814 : if (row_trigger &&
6484 2134 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6485 30 : continue;
6486 2784 : break;
6487 : }
6488 : }
6489 :
6490 : /*
6491 : * If the trigger is a deferred unique constraint check trigger, only
6492 : * queue it if the unique constraint was potentially violated, which
6493 : * we know from index insertion time.
6494 : */
6495 12086 : if (trigger->tgfoid == F_UNIQUE_KEY_RECHECK)
6496 : {
6497 210 : if (!list_member_oid(recheckIndexes, trigger->tgconstrindid))
6498 88 : continue; /* Uniqueness definitely not violated */
6499 : }
6500 :
6501 : /*
6502 : * Fill in event structure and add it to the current query's queue.
6503 : * Note we set ats_table to NULL whenever this trigger doesn't use
6504 : * transition tables, to improve sharability of the shared event data.
6505 : */
6506 11998 : new_shared.ats_event =
6507 23996 : (event & TRIGGER_EVENT_OPMASK) |
6508 11998 : (row_trigger ? TRIGGER_EVENT_ROW : 0) |
6509 11998 : (trigger->tgdeferrable ? AFTER_TRIGGER_DEFERRABLE : 0) |
6510 11998 : (trigger->tginitdeferred ? AFTER_TRIGGER_INITDEFERRED : 0);
6511 11998 : new_shared.ats_tgoid = trigger->tgoid;
6512 11998 : new_shared.ats_relid = RelationGetRelid(rel);
6513 11998 : new_shared.ats_rolid = GetUserId();
6514 11998 : new_shared.ats_firing_id = 0;
6515 11998 : if ((trigger->tgoldtable || trigger->tgnewtable) &&
6516 : transition_capture != NULL)
6517 636 : new_shared.ats_table = transition_capture->tcs_private;
6518 : else
6519 11362 : new_shared.ats_table = NULL;
6520 11998 : new_shared.ats_modifiedcols = modifiedCols;
6521 :
6522 11998 : afterTriggerAddEvent(&afterTriggers.query_stack[afterTriggers.query_depth].events,
6523 : &new_event, &new_shared);
6524 : }
6525 :
6526 : /*
6527 : * Finally, spool any foreign tuple(s). The tuplestore squashes them to
6528 : * minimal tuples, so this loses any system columns. The executor lost
6529 : * those columns before us, for an unrelated reason, so this is fine.
6530 : */
6531 11038 : if (fdw_tuplestore)
6532 : {
6533 50 : if (oldslot != NULL)
6534 32 : tuplestore_puttupleslot(fdw_tuplestore, oldslot);
6535 50 : if (newslot != NULL)
6536 36 : tuplestore_puttupleslot(fdw_tuplestore, newslot);
6537 : }
6538 : }
6539 :
6540 : /*
6541 : * Detect whether we already queued BEFORE STATEMENT triggers for the given
6542 : * relation + operation, and set the flag so the next call will report "true".
6543 : */
6544 : static bool
6545 510 : before_stmt_triggers_fired(Oid relid, CmdType cmdType)
6546 : {
6547 : bool result;
6548 : AfterTriggersTableData *table;
6549 :
6550 : /* Check state, like AfterTriggerSaveEvent. */
6551 510 : if (afterTriggers.query_depth < 0)
6552 0 : elog(ERROR, "before_stmt_triggers_fired() called outside of query");
6553 :
6554 : /* Be sure we have enough space to record events at this query depth. */
6555 510 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6556 336 : AfterTriggerEnlargeQueryState();
6557 :
6558 : /*
6559 : * We keep this state in the AfterTriggersTableData that also holds
6560 : * transition tables for the relation + operation. In this way, if we are
6561 : * forced to make a new set of transition tables because more tuples get
6562 : * entered after we've already fired triggers, we will allow a new set of
6563 : * statement triggers to get queued.
6564 : */
6565 510 : table = GetAfterTriggersTableData(relid, cmdType);
6566 510 : result = table->before_trig_done;
6567 510 : table->before_trig_done = true;
6568 510 : return result;
6569 : }
6570 :
6571 : /*
6572 : * If we previously queued a set of AFTER STATEMENT triggers for the given
6573 : * relation + operation, and they've not been fired yet, cancel them. The
6574 : * caller will queue a fresh set that's after any row-level triggers that may
6575 : * have been queued by the current sub-statement, preserving (as much as
6576 : * possible) the property that AFTER ROW triggers fire before AFTER STATEMENT
6577 : * triggers, and that the latter only fire once. This deals with the
6578 : * situation where several FK enforcement triggers sequentially queue triggers
6579 : * for the same table into the same trigger query level. We can't fully
6580 : * prevent odd behavior though: if there are AFTER ROW triggers taking
6581 : * transition tables, we don't want to change the transition tables once the
6582 : * first such trigger has seen them. In such a case, any additional events
6583 : * will result in creating new transition tables and allowing new firings of
6584 : * statement triggers.
6585 : *
6586 : * This also saves the current event list location so that a later invocation
6587 : * of this function can cheaply find the triggers we're about to queue and
6588 : * cancel them.
6589 : */
6590 : static void
6591 1086 : cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent)
6592 : {
6593 : AfterTriggersTableData *table;
6594 1086 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[afterTriggers.query_depth];
6595 :
6596 : /*
6597 : * We keep this state in the AfterTriggersTableData that also holds
6598 : * transition tables for the relation + operation. In this way, if we are
6599 : * forced to make a new set of transition tables because more tuples get
6600 : * entered after we've already fired triggers, we will allow a new set of
6601 : * statement triggers to get queued without canceling the old ones.
6602 : */
6603 1086 : table = GetAfterTriggersTableData(relid, cmdType);
6604 :
6605 1086 : if (table->after_trig_done)
6606 : {
6607 : /*
6608 : * We want to start scanning from the tail location that existed just
6609 : * before we inserted any statement triggers. But the events list
6610 : * might've been entirely empty then, in which case scan from the
6611 : * current head.
6612 : */
6613 : AfterTriggerEvent event;
6614 : AfterTriggerEventChunk *chunk;
6615 :
6616 66 : if (table->after_trig_events.tail)
6617 : {
6618 60 : chunk = table->after_trig_events.tail;
6619 60 : event = (AfterTriggerEvent) table->after_trig_events.tailfree;
6620 : }
6621 : else
6622 : {
6623 6 : chunk = qs->events.head;
6624 6 : event = NULL;
6625 : }
6626 :
6627 96 : for_each_chunk_from(chunk)
6628 : {
6629 66 : if (event == NULL)
6630 6 : event = (AfterTriggerEvent) CHUNK_DATA_START(chunk);
6631 138 : for_each_event_from(event, chunk)
6632 : {
6633 108 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6634 :
6635 : /*
6636 : * Exit loop when we reach events that aren't AS triggers for
6637 : * the target relation.
6638 : */
6639 108 : if (evtshared->ats_relid != relid)
6640 0 : goto done;
6641 108 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) != tgevent)
6642 0 : goto done;
6643 108 : if (!TRIGGER_FIRED_FOR_STATEMENT(evtshared->ats_event))
6644 36 : goto done;
6645 72 : if (!TRIGGER_FIRED_AFTER(evtshared->ats_event))
6646 0 : goto done;
6647 : /* OK, mark it DONE */
6648 72 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
6649 72 : event->ate_flags |= AFTER_TRIGGER_DONE;
6650 : }
6651 : /* signal we must reinitialize event ptr for next chunk */
6652 30 : event = NULL;
6653 : }
6654 : }
6655 1050 : done:
6656 :
6657 : /* In any case, save current insertion point for next time */
6658 1086 : table->after_trig_done = true;
6659 1086 : table->after_trig_events = qs->events;
6660 1086 : }
6661 :
6662 : /*
6663 : * GUC assign_hook for session_replication_role
6664 : */
6665 : void
6666 3296 : assign_session_replication_role(int newval, void *extra)
6667 : {
6668 : /*
6669 : * Must flush the plan cache when changing replication role; but don't
6670 : * flush unnecessarily.
6671 : */
6672 3296 : if (SessionReplicationRole != newval)
6673 1046 : ResetPlanCache();
6674 3296 : }
6675 :
6676 : /*
6677 : * SQL function pg_trigger_depth()
6678 : */
6679 : Datum
6680 90 : pg_trigger_depth(PG_FUNCTION_ARGS)
6681 : {
6682 90 : PG_RETURN_INT32(MyTriggerDepth);
6683 : }
6684 :
6685 : /*
6686 : * Check whether a trigger modified a virtual generated column and replace the
6687 : * value with null if so.
6688 : *
6689 : * We need to check this so that we don't end up storing a non-null value in a
6690 : * virtual generated column.
6691 : *
6692 : * We don't need to check for stored generated columns, since those will be
6693 : * overwritten later anyway.
6694 : */
6695 : static HeapTuple
6696 2048 : check_modified_virtual_generated(TupleDesc tupdesc, HeapTuple tuple)
6697 : {
6698 2048 : if (!(tupdesc->constr && tupdesc->constr->has_generated_virtual))
6699 2030 : return tuple;
6700 :
6701 66 : for (int i = 0; i < tupdesc->natts; i++)
6702 : {
6703 48 : if (TupleDescAttr(tupdesc, i)->attgenerated == ATTRIBUTE_GENERATED_VIRTUAL)
6704 : {
6705 18 : if (!heap_attisnull(tuple, i + 1, tupdesc))
6706 : {
6707 12 : int replCol = i + 1;
6708 12 : Datum replValue = 0;
6709 12 : bool replIsnull = true;
6710 :
6711 12 : tuple = heap_modify_tuple_by_cols(tuple, tupdesc, 1, &replCol, &replValue, &replIsnull);
6712 : }
6713 : }
6714 : }
6715 :
6716 18 : return tuple;
6717 : }
|
