Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * trigger.c
4 : * PostgreSQL TRIGGERs support code.
5 : *
6 : * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : * IDENTIFICATION
10 : * src/backend/commands/trigger.c
11 : *
12 : *-------------------------------------------------------------------------
13 : */
14 : #include "postgres.h"
15 :
16 : #include "access/genam.h"
17 : #include "access/htup_details.h"
18 : #include "access/relation.h"
19 : #include "access/sysattr.h"
20 : #include "access/table.h"
21 : #include "access/tableam.h"
22 : #include "access/xact.h"
23 : #include "catalog/catalog.h"
24 : #include "catalog/dependency.h"
25 : #include "catalog/indexing.h"
26 : #include "catalog/objectaccess.h"
27 : #include "catalog/partition.h"
28 : #include "catalog/pg_constraint.h"
29 : #include "catalog/pg_inherits.h"
30 : #include "catalog/pg_proc.h"
31 : #include "catalog/pg_trigger.h"
32 : #include "catalog/pg_type.h"
33 : #include "commands/dbcommands.h"
34 : #include "commands/trigger.h"
35 : #include "executor/executor.h"
36 : #include "miscadmin.h"
37 : #include "nodes/bitmapset.h"
38 : #include "nodes/makefuncs.h"
39 : #include "optimizer/optimizer.h"
40 : #include "parser/parse_clause.h"
41 : #include "parser/parse_collate.h"
42 : #include "parser/parse_func.h"
43 : #include "parser/parse_relation.h"
44 : #include "partitioning/partdesc.h"
45 : #include "pgstat.h"
46 : #include "rewrite/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 : TupleTableSlot **epqslot,
83 : TM_Result *tmresultp,
84 : TM_FailureData *tmfdp);
85 : static bool TriggerEnabled(EState *estate, ResultRelInfo *relinfo,
86 : Trigger *trigger, TriggerEvent event,
87 : Bitmapset *modifiedCols,
88 : TupleTableSlot *oldslot, TupleTableSlot *newslot);
89 : static HeapTuple ExecCallTriggerFunc(TriggerData *trigdata,
90 : int tgindx,
91 : FmgrInfo *finfo,
92 : Instrumentation *instr,
93 : MemoryContext per_tuple_context);
94 : static void AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
95 : ResultRelInfo *src_partinfo,
96 : ResultRelInfo *dst_partinfo,
97 : int event, bool row_trigger,
98 : TupleTableSlot *oldslot, TupleTableSlot *newslot,
99 : List *recheckIndexes, Bitmapset *modifiedCols,
100 : TransitionCaptureState *transition_capture,
101 : bool is_crosspart_update);
102 : static void AfterTriggerEnlargeQueryState(void);
103 : static bool before_stmt_triggers_fired(Oid relid, CmdType cmdType);
104 :
105 :
106 : /*
107 : * Create a trigger. Returns the address of the created trigger.
108 : *
109 : * queryString is the source text of the CREATE TRIGGER command.
110 : * This must be supplied if a whenClause is specified, else it can be NULL.
111 : *
112 : * relOid, if nonzero, is the relation on which the trigger should be
113 : * created. If zero, the name provided in the statement will be looked up.
114 : *
115 : * refRelOid, if nonzero, is the relation to which the constraint trigger
116 : * refers. If zero, the constraint relation name provided in the statement
117 : * will be looked up as needed.
118 : *
119 : * constraintOid, if nonzero, says that this trigger is being created
120 : * internally to implement that constraint. A suitable pg_depend entry will
121 : * be made to link the trigger to that constraint. constraintOid is zero when
122 : * executing a user-entered CREATE TRIGGER command. (For CREATE CONSTRAINT
123 : * TRIGGER, we build a pg_constraint entry internally.)
124 : *
125 : * indexOid, if nonzero, is the OID of an index associated with the constraint.
126 : * We do nothing with this except store it into pg_trigger.tgconstrindid;
127 : * but when creating a trigger for a deferrable unique constraint on a
128 : * partitioned table, its children are looked up. Note we don't cope with
129 : * invalid indexes in that case.
130 : *
131 : * funcoid, if nonzero, is the OID of the function to invoke. When this is
132 : * given, stmt->funcname is ignored.
133 : *
134 : * parentTriggerOid, if nonzero, is a trigger that begets this one; so that
135 : * if that trigger is dropped, this one should be too. There are two cases
136 : * when a nonzero value is passed for this: 1) when this function recurses to
137 : * create the trigger on partitions, 2) when creating child foreign key
138 : * triggers; see CreateFKCheckTrigger() and createForeignKeyActionTriggers().
139 : *
140 : * If whenClause is passed, it is an already-transformed expression for
141 : * WHEN. In this case, we ignore any that may come in stmt->whenClause.
142 : *
143 : * If isInternal is true then this is an internally-generated trigger.
144 : * This argument sets the tgisinternal field of the pg_trigger entry, and
145 : * if true causes us to modify the given trigger name to ensure uniqueness.
146 : *
147 : * When isInternal is not true we require ACL_TRIGGER permissions on the
148 : * relation, as well as ACL_EXECUTE on the trigger function. For internal
149 : * triggers the caller must apply any required permission checks.
150 : *
151 : * When called on partitioned tables, this function recurses to create the
152 : * trigger on all the partitions, except if isInternal is true, in which
153 : * case caller is expected to execute recursion on its own. in_partition
154 : * indicates such a recursive call; outside callers should pass "false"
155 : * (but see CloneRowTriggersToPartition).
156 : */
157 : ObjectAddress
158 13412 : CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
159 : Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
160 : Oid funcoid, Oid parentTriggerOid, Node *whenClause,
161 : bool isInternal, bool in_partition)
162 : {
163 : return
164 13412 : CreateTriggerFiringOn(stmt, queryString, relOid, refRelOid,
165 : constraintOid, indexOid, funcoid,
166 : parentTriggerOid, whenClause, isInternal,
167 : in_partition, TRIGGER_FIRES_ON_ORIGIN);
168 : }
169 :
170 : /*
171 : * Like the above; additionally the firing condition
172 : * (always/origin/replica/disabled) can be specified.
173 : */
174 : ObjectAddress
175 14288 : CreateTriggerFiringOn(CreateTrigStmt *stmt, const char *queryString,
176 : Oid relOid, Oid refRelOid, Oid constraintOid,
177 : Oid indexOid, Oid funcoid, Oid parentTriggerOid,
178 : Node *whenClause, bool isInternal, bool in_partition,
179 : char trigger_fires_when)
180 : {
181 : int16 tgtype;
182 : int ncolumns;
183 : int16 *columns;
184 : int2vector *tgattr;
185 : List *whenRtable;
186 : char *qual;
187 : Datum values[Natts_pg_trigger];
188 : bool nulls[Natts_pg_trigger];
189 : Relation rel;
190 : AclResult aclresult;
191 : Relation tgrel;
192 : Relation pgrel;
193 14288 : HeapTuple tuple = NULL;
194 : Oid funcrettype;
195 14288 : Oid trigoid = InvalidOid;
196 : char internaltrigname[NAMEDATALEN];
197 : char *trigname;
198 14288 : Oid constrrelid = InvalidOid;
199 : ObjectAddress myself,
200 : referenced;
201 14288 : char *oldtablename = NULL;
202 14288 : char *newtablename = NULL;
203 : bool partition_recurse;
204 14288 : bool trigger_exists = false;
205 14288 : Oid existing_constraint_oid = InvalidOid;
206 14288 : bool existing_isInternal = false;
207 14288 : bool existing_isClone = false;
208 :
209 14288 : if (OidIsValid(relOid))
210 11176 : rel = table_open(relOid, ShareRowExclusiveLock);
211 : else
212 3112 : rel = table_openrv(stmt->relation, ShareRowExclusiveLock);
213 :
214 : /*
215 : * Triggers must be on tables or views, and there are additional
216 : * relation-type-specific restrictions.
217 : */
218 14288 : if (rel->rd_rel->relkind == RELKIND_RELATION)
219 : {
220 : /* Tables can't have INSTEAD OF triggers */
221 11766 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
222 10478 : stmt->timing != TRIGGER_TYPE_AFTER)
223 18 : ereport(ERROR,
224 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
225 : errmsg("\"%s\" is a table",
226 : RelationGetRelationName(rel)),
227 : errdetail("Tables cannot have INSTEAD OF triggers.")));
228 : }
229 2522 : else if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
230 : {
231 : /* Partitioned tables can't have INSTEAD OF triggers */
232 2214 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
233 2112 : stmt->timing != TRIGGER_TYPE_AFTER)
234 6 : ereport(ERROR,
235 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
236 : errmsg("\"%s\" is a table",
237 : RelationGetRelationName(rel)),
238 : errdetail("Tables cannot have INSTEAD OF triggers.")));
239 :
240 : /*
241 : * FOR EACH ROW triggers have further restrictions
242 : */
243 2208 : if (stmt->row)
244 : {
245 : /*
246 : * Disallow use of transition tables.
247 : *
248 : * Note that we have another restriction about transition tables
249 : * in partitions; search for 'has_superclass' below for an
250 : * explanation. The check here is just to protect from the fact
251 : * that if we allowed it here, the creation would succeed for a
252 : * partitioned table with no partitions, but would be blocked by
253 : * the other restriction when the first partition was created,
254 : * which is very unfriendly behavior.
255 : */
256 1990 : if (stmt->transitionRels != NIL)
257 6 : ereport(ERROR,
258 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
259 : errmsg("\"%s\" is a partitioned table",
260 : RelationGetRelationName(rel)),
261 : errdetail("ROW triggers with transition tables are not supported on partitioned tables.")));
262 : }
263 : }
264 308 : else if (rel->rd_rel->relkind == RELKIND_VIEW)
265 : {
266 : /*
267 : * Views can have INSTEAD OF triggers (which we check below are
268 : * row-level), or statement-level BEFORE/AFTER triggers.
269 : */
270 204 : if (stmt->timing != TRIGGER_TYPE_INSTEAD && stmt->row)
271 36 : ereport(ERROR,
272 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
273 : errmsg("\"%s\" is a view",
274 : RelationGetRelationName(rel)),
275 : errdetail("Views cannot have row-level BEFORE or AFTER triggers.")));
276 : /* Disallow TRUNCATE triggers on VIEWs */
277 168 : if (TRIGGER_FOR_TRUNCATE(stmt->events))
278 12 : ereport(ERROR,
279 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
280 : errmsg("\"%s\" is a view",
281 : RelationGetRelationName(rel)),
282 : errdetail("Views cannot have TRUNCATE triggers.")));
283 : }
284 104 : else if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
285 : {
286 104 : if (stmt->timing != TRIGGER_TYPE_BEFORE &&
287 54 : stmt->timing != TRIGGER_TYPE_AFTER)
288 0 : ereport(ERROR,
289 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
290 : errmsg("\"%s\" is a foreign table",
291 : RelationGetRelationName(rel)),
292 : errdetail("Foreign tables cannot have INSTEAD OF triggers.")));
293 :
294 : /*
295 : * We disallow constraint triggers to protect the assumption that
296 : * triggers on FKs can't be deferred. See notes with AfterTriggers
297 : * data structures, below.
298 : */
299 104 : if (stmt->isconstraint)
300 6 : ereport(ERROR,
301 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
302 : errmsg("\"%s\" is a foreign table",
303 : RelationGetRelationName(rel)),
304 : errdetail("Foreign tables cannot have constraint triggers.")));
305 : }
306 : else
307 0 : ereport(ERROR,
308 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
309 : errmsg("relation \"%s\" cannot have triggers",
310 : RelationGetRelationName(rel)),
311 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
312 :
313 14204 : if (!allowSystemTableMods && IsSystemRelation(rel))
314 2 : ereport(ERROR,
315 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
316 : errmsg("permission denied: \"%s\" is a system catalog",
317 : RelationGetRelationName(rel))));
318 :
319 14202 : if (stmt->isconstraint)
320 : {
321 : /*
322 : * We must take a lock on the target relation to protect against
323 : * concurrent drop. It's not clear that AccessShareLock is strong
324 : * enough, but we certainly need at least that much... otherwise, we
325 : * might end up creating a pg_constraint entry referencing a
326 : * nonexistent table.
327 : */
328 10450 : if (OidIsValid(refRelOid))
329 : {
330 10226 : LockRelationOid(refRelOid, AccessShareLock);
331 10226 : constrrelid = refRelOid;
332 : }
333 224 : else if (stmt->constrrel != NULL)
334 24 : constrrelid = RangeVarGetRelid(stmt->constrrel, AccessShareLock,
335 : false);
336 : }
337 :
338 : /* permission checks */
339 14202 : if (!isInternal)
340 : {
341 3902 : aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
342 : ACL_TRIGGER);
343 3902 : if (aclresult != ACLCHECK_OK)
344 0 : aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
345 0 : RelationGetRelationName(rel));
346 :
347 3902 : if (OidIsValid(constrrelid))
348 : {
349 42 : aclresult = pg_class_aclcheck(constrrelid, GetUserId(),
350 : ACL_TRIGGER);
351 42 : if (aclresult != ACLCHECK_OK)
352 0 : aclcheck_error(aclresult, get_relkind_objtype(get_rel_relkind(constrrelid)),
353 0 : get_rel_name(constrrelid));
354 : }
355 : }
356 :
357 : /*
358 : * When called on a partitioned table to create a FOR EACH ROW trigger
359 : * that's not internal, we create one trigger for each partition, too.
360 : *
361 : * For that, we'd better hold lock on all of them ahead of time.
362 : */
363 17116 : partition_recurse = !isInternal && stmt->row &&
364 2914 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE;
365 14202 : if (partition_recurse)
366 410 : list_free(find_all_inheritors(RelationGetRelid(rel),
367 : ShareRowExclusiveLock, NULL));
368 :
369 : /* Compute tgtype */
370 14202 : TRIGGER_CLEAR_TYPE(tgtype);
371 14202 : if (stmt->row)
372 13214 : TRIGGER_SETT_ROW(tgtype);
373 14202 : tgtype |= stmt->timing;
374 14202 : tgtype |= stmt->events;
375 :
376 : /* Disallow ROW-level TRUNCATE triggers */
377 14202 : if (TRIGGER_FOR_ROW(tgtype) && TRIGGER_FOR_TRUNCATE(tgtype))
378 0 : ereport(ERROR,
379 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
380 : errmsg("TRUNCATE FOR EACH ROW triggers are not supported")));
381 :
382 : /* INSTEAD triggers must be row-level, and can't have WHEN or columns */
383 14202 : if (TRIGGER_FOR_INSTEAD(tgtype))
384 : {
385 114 : if (!TRIGGER_FOR_ROW(tgtype))
386 6 : ereport(ERROR,
387 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
388 : errmsg("INSTEAD OF triggers must be FOR EACH ROW")));
389 108 : if (stmt->whenClause)
390 6 : ereport(ERROR,
391 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
392 : errmsg("INSTEAD OF triggers cannot have WHEN conditions")));
393 102 : if (stmt->columns != NIL)
394 6 : ereport(ERROR,
395 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
396 : errmsg("INSTEAD OF triggers cannot have column lists")));
397 : }
398 :
399 : /*
400 : * We don't yet support naming ROW transition variables, but the parser
401 : * recognizes the syntax so we can give a nicer message here.
402 : *
403 : * Per standard, REFERENCING TABLE names are only allowed on AFTER
404 : * triggers. Per standard, REFERENCING ROW names are not allowed with FOR
405 : * EACH STATEMENT. Per standard, each OLD/NEW, ROW/TABLE permutation is
406 : * only allowed once. Per standard, OLD may not be specified when
407 : * creating a trigger only for INSERT, and NEW may not be specified when
408 : * creating a trigger only for DELETE.
409 : *
410 : * Notice that the standard allows an AFTER ... FOR EACH ROW trigger to
411 : * reference both ROW and TABLE transition data.
412 : */
413 14184 : if (stmt->transitionRels != NIL)
414 : {
415 418 : List *varList = stmt->transitionRels;
416 : ListCell *lc;
417 :
418 914 : foreach(lc, varList)
419 : {
420 544 : TriggerTransition *tt = lfirst_node(TriggerTransition, lc);
421 :
422 544 : if (!(tt->isTable))
423 0 : ereport(ERROR,
424 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
425 : errmsg("ROW variable naming in the REFERENCING clause is not supported"),
426 : errhint("Use OLD TABLE or NEW TABLE for naming transition tables.")));
427 :
428 : /*
429 : * Because of the above test, we omit further ROW-related testing
430 : * below. If we later allow naming OLD and NEW ROW variables,
431 : * adjustments will be needed below.
432 : */
433 :
434 544 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
435 6 : ereport(ERROR,
436 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
437 : errmsg("\"%s\" is a foreign table",
438 : RelationGetRelationName(rel)),
439 : errdetail("Triggers on foreign tables cannot have transition tables.")));
440 :
441 538 : if (rel->rd_rel->relkind == RELKIND_VIEW)
442 6 : ereport(ERROR,
443 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
444 : errmsg("\"%s\" is a view",
445 : RelationGetRelationName(rel)),
446 : errdetail("Triggers on views cannot have transition tables.")));
447 :
448 : /*
449 : * We currently don't allow row-level triggers with transition
450 : * tables on partition or inheritance children. Such triggers
451 : * would somehow need to see tuples converted to the format of the
452 : * table they're attached to, and it's not clear which subset of
453 : * tuples each child should see. See also the prohibitions in
454 : * ATExecAttachPartition() and ATExecAddInherit().
455 : */
456 532 : if (TRIGGER_FOR_ROW(tgtype) && has_superclass(rel->rd_id))
457 : {
458 : /* Use appropriate error message. */
459 12 : if (rel->rd_rel->relispartition)
460 6 : ereport(ERROR,
461 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
462 : errmsg("ROW triggers with transition tables are not supported on partitions")));
463 : else
464 6 : ereport(ERROR,
465 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
466 : errmsg("ROW triggers with transition tables are not supported on inheritance children")));
467 : }
468 :
469 520 : if (stmt->timing != TRIGGER_TYPE_AFTER)
470 0 : ereport(ERROR,
471 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
472 : errmsg("transition table name can only be specified for an AFTER trigger")));
473 :
474 520 : if (TRIGGER_FOR_TRUNCATE(tgtype))
475 6 : ereport(ERROR,
476 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
477 : errmsg("TRUNCATE triggers with transition tables are not supported")));
478 :
479 : /*
480 : * We currently don't allow multi-event triggers ("INSERT OR
481 : * UPDATE") with transition tables, because it's not clear how to
482 : * handle INSERT ... ON CONFLICT statements which can fire both
483 : * INSERT and UPDATE triggers. We show the inserted tuples to
484 : * INSERT triggers and the updated tuples to UPDATE triggers, but
485 : * it's not yet clear what INSERT OR UPDATE trigger should see.
486 : * This restriction could be lifted if we can decide on the right
487 : * semantics in a later release.
488 : */
489 514 : if (((TRIGGER_FOR_INSERT(tgtype) ? 1 : 0) +
490 514 : (TRIGGER_FOR_UPDATE(tgtype) ? 1 : 0) +
491 514 : (TRIGGER_FOR_DELETE(tgtype) ? 1 : 0)) != 1)
492 6 : ereport(ERROR,
493 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
494 : errmsg("transition tables cannot be specified for triggers with more than one event")));
495 :
496 : /*
497 : * We currently don't allow column-specific triggers with
498 : * transition tables. Per spec, that seems to require
499 : * accumulating separate transition tables for each combination of
500 : * columns, which is a lot of work for a rather marginal feature.
501 : */
502 508 : if (stmt->columns != NIL)
503 6 : ereport(ERROR,
504 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
505 : errmsg("transition tables cannot be specified for triggers with column lists")));
506 :
507 : /*
508 : * We disallow constraint triggers with transition tables, to
509 : * protect the assumption that such triggers can't be deferred.
510 : * See notes with AfterTriggers data structures, below.
511 : *
512 : * Currently this is enforced by the grammar, so just Assert here.
513 : */
514 : Assert(!stmt->isconstraint);
515 :
516 502 : if (tt->isNew)
517 : {
518 264 : if (!(TRIGGER_FOR_INSERT(tgtype) ||
519 146 : TRIGGER_FOR_UPDATE(tgtype)))
520 0 : ereport(ERROR,
521 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
522 : errmsg("NEW TABLE can only be specified for an INSERT or UPDATE trigger")));
523 :
524 264 : if (newtablename != NULL)
525 0 : ereport(ERROR,
526 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
527 : errmsg("NEW TABLE cannot be specified multiple times")));
528 :
529 264 : newtablename = tt->name;
530 : }
531 : else
532 : {
533 238 : if (!(TRIGGER_FOR_DELETE(tgtype) ||
534 140 : TRIGGER_FOR_UPDATE(tgtype)))
535 6 : ereport(ERROR,
536 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
537 : errmsg("OLD TABLE can only be specified for a DELETE or UPDATE trigger")));
538 :
539 232 : if (oldtablename != NULL)
540 0 : ereport(ERROR,
541 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
542 : errmsg("OLD TABLE cannot be specified multiple times")));
543 :
544 232 : oldtablename = tt->name;
545 : }
546 : }
547 :
548 370 : if (newtablename != NULL && oldtablename != NULL &&
549 126 : strcmp(newtablename, oldtablename) == 0)
550 0 : ereport(ERROR,
551 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
552 : errmsg("OLD TABLE name and NEW TABLE name cannot be the same")));
553 : }
554 :
555 : /*
556 : * Parse the WHEN clause, if any and we weren't passed an already
557 : * transformed one.
558 : *
559 : * Note that as a side effect, we fill whenRtable when parsing. If we got
560 : * an already parsed clause, this does not occur, which is what we want --
561 : * no point in adding redundant dependencies below.
562 : */
563 14136 : if (!whenClause && stmt->whenClause)
564 110 : {
565 : ParseState *pstate;
566 : ParseNamespaceItem *nsitem;
567 : List *varList;
568 : ListCell *lc;
569 :
570 : /* Set up a pstate to parse with */
571 146 : pstate = make_parsestate(NULL);
572 146 : pstate->p_sourcetext = queryString;
573 :
574 : /*
575 : * Set up nsitems for OLD and NEW references.
576 : *
577 : * 'OLD' must always have varno equal to 1 and 'NEW' equal to 2.
578 : */
579 146 : nsitem = addRangeTableEntryForRelation(pstate, rel,
580 : AccessShareLock,
581 : makeAlias("old", NIL),
582 : false, false);
583 146 : addNSItemToQuery(pstate, nsitem, false, true, true);
584 146 : nsitem = addRangeTableEntryForRelation(pstate, rel,
585 : AccessShareLock,
586 : makeAlias("new", NIL),
587 : false, false);
588 146 : addNSItemToQuery(pstate, nsitem, false, true, true);
589 :
590 : /* Transform expression. Copy to be sure we don't modify original */
591 146 : whenClause = transformWhereClause(pstate,
592 146 : copyObject(stmt->whenClause),
593 : EXPR_KIND_TRIGGER_WHEN,
594 : "WHEN");
595 : /* we have to fix its collations too */
596 146 : assign_expr_collations(pstate, whenClause);
597 :
598 : /*
599 : * Check for disallowed references to OLD/NEW.
600 : *
601 : * NB: pull_var_clause is okay here only because we don't allow
602 : * subselects in WHEN clauses; it would fail to examine the contents
603 : * of subselects.
604 : */
605 146 : varList = pull_var_clause(whenClause, 0);
606 300 : foreach(lc, varList)
607 : {
608 190 : Var *var = (Var *) lfirst(lc);
609 :
610 190 : switch (var->varno)
611 : {
612 74 : case PRS2_OLD_VARNO:
613 74 : if (!TRIGGER_FOR_ROW(tgtype))
614 6 : ereport(ERROR,
615 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
616 : errmsg("statement trigger's WHEN condition cannot reference column values"),
617 : parser_errposition(pstate, var->location)));
618 68 : if (TRIGGER_FOR_INSERT(tgtype))
619 6 : ereport(ERROR,
620 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
621 : errmsg("INSERT trigger's WHEN condition cannot reference OLD values"),
622 : parser_errposition(pstate, var->location)));
623 : /* system columns are okay here */
624 62 : break;
625 116 : case PRS2_NEW_VARNO:
626 116 : if (!TRIGGER_FOR_ROW(tgtype))
627 0 : ereport(ERROR,
628 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
629 : errmsg("statement trigger's WHEN condition cannot reference column values"),
630 : parser_errposition(pstate, var->location)));
631 116 : if (TRIGGER_FOR_DELETE(tgtype))
632 6 : ereport(ERROR,
633 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
634 : errmsg("DELETE trigger's WHEN condition cannot reference NEW values"),
635 : parser_errposition(pstate, var->location)));
636 110 : if (var->varattno < 0 && TRIGGER_FOR_BEFORE(tgtype))
637 6 : ereport(ERROR,
638 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
639 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW system columns"),
640 : parser_errposition(pstate, var->location)));
641 104 : if (TRIGGER_FOR_BEFORE(tgtype) &&
642 34 : var->varattno == 0 &&
643 12 : RelationGetDescr(rel)->constr &&
644 6 : RelationGetDescr(rel)->constr->has_generated_stored)
645 6 : ereport(ERROR,
646 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
647 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW generated columns"),
648 : errdetail("A whole-row reference is used and the table contains generated columns."),
649 : parser_errposition(pstate, var->location)));
650 98 : if (TRIGGER_FOR_BEFORE(tgtype) &&
651 28 : var->varattno > 0 &&
652 22 : TupleDescAttr(RelationGetDescr(rel), var->varattno - 1)->attgenerated)
653 6 : ereport(ERROR,
654 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
655 : errmsg("BEFORE trigger's WHEN condition cannot reference NEW generated columns"),
656 : errdetail("Column \"%s\" is a generated column.",
657 : NameStr(TupleDescAttr(RelationGetDescr(rel), var->varattno - 1)->attname)),
658 : parser_errposition(pstate, var->location)));
659 92 : break;
660 0 : default:
661 : /* can't happen without add_missing_from, so just elog */
662 0 : elog(ERROR, "trigger WHEN condition cannot contain references to other relations");
663 : break;
664 : }
665 : }
666 :
667 : /* we'll need the rtable for recordDependencyOnExpr */
668 110 : whenRtable = pstate->p_rtable;
669 :
670 110 : qual = nodeToString(whenClause);
671 :
672 110 : free_parsestate(pstate);
673 : }
674 13990 : else if (!whenClause)
675 : {
676 13948 : whenClause = NULL;
677 13948 : whenRtable = NIL;
678 13948 : qual = NULL;
679 : }
680 : else
681 : {
682 42 : qual = nodeToString(whenClause);
683 42 : whenRtable = NIL;
684 : }
685 :
686 : /*
687 : * Find and validate the trigger function.
688 : */
689 14100 : if (!OidIsValid(funcoid))
690 13224 : funcoid = LookupFuncName(stmt->funcname, 0, NULL, false);
691 14100 : if (!isInternal)
692 : {
693 3800 : aclresult = object_aclcheck(ProcedureRelationId, funcoid, GetUserId(), ACL_EXECUTE);
694 3800 : if (aclresult != ACLCHECK_OK)
695 0 : aclcheck_error(aclresult, OBJECT_FUNCTION,
696 0 : NameListToString(stmt->funcname));
697 : }
698 14100 : funcrettype = get_func_rettype(funcoid);
699 14100 : if (funcrettype != TRIGGEROID)
700 0 : ereport(ERROR,
701 : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
702 : errmsg("function %s must return type %s",
703 : NameListToString(stmt->funcname), "trigger")));
704 :
705 : /*
706 : * Scan pg_trigger to see if there is already a trigger of the same name.
707 : * Skip this for internally generated triggers, since we'll modify the
708 : * name to be unique below.
709 : *
710 : * NOTE that this is cool only because we have ShareRowExclusiveLock on
711 : * the relation, so the trigger set won't be changing underneath us.
712 : */
713 14100 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
714 14100 : if (!isInternal)
715 : {
716 : ScanKeyData skeys[2];
717 : SysScanDesc tgscan;
718 :
719 3800 : ScanKeyInit(&skeys[0],
720 : Anum_pg_trigger_tgrelid,
721 : BTEqualStrategyNumber, F_OIDEQ,
722 : ObjectIdGetDatum(RelationGetRelid(rel)));
723 :
724 3800 : ScanKeyInit(&skeys[1],
725 : Anum_pg_trigger_tgname,
726 : BTEqualStrategyNumber, F_NAMEEQ,
727 3800 : CStringGetDatum(stmt->trigname));
728 :
729 3800 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
730 : NULL, 2, skeys);
731 :
732 : /* There should be at most one matching tuple */
733 3800 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
734 : {
735 102 : Form_pg_trigger oldtrigger = (Form_pg_trigger) GETSTRUCT(tuple);
736 :
737 102 : trigoid = oldtrigger->oid;
738 102 : existing_constraint_oid = oldtrigger->tgconstraint;
739 102 : existing_isInternal = oldtrigger->tgisinternal;
740 102 : existing_isClone = OidIsValid(oldtrigger->tgparentid);
741 102 : trigger_exists = true;
742 : /* copy the tuple to use in CatalogTupleUpdate() */
743 102 : tuple = heap_copytuple(tuple);
744 : }
745 3800 : systable_endscan(tgscan);
746 : }
747 :
748 14100 : if (!trigger_exists)
749 : {
750 : /* Generate the OID for the new trigger. */
751 13998 : trigoid = GetNewOidWithIndex(tgrel, TriggerOidIndexId,
752 : Anum_pg_trigger_oid);
753 : }
754 : else
755 : {
756 : /*
757 : * If OR REPLACE was specified, we'll replace the old trigger;
758 : * otherwise complain about the duplicate name.
759 : */
760 102 : if (!stmt->replace)
761 18 : ereport(ERROR,
762 : (errcode(ERRCODE_DUPLICATE_OBJECT),
763 : errmsg("trigger \"%s\" for relation \"%s\" already exists",
764 : stmt->trigname, RelationGetRelationName(rel))));
765 :
766 : /*
767 : * An internal trigger or a child trigger (isClone) cannot be replaced
768 : * by a user-defined trigger. However, skip this test when
769 : * in_partition, because then we're recursing from a partitioned table
770 : * and the check was made at the parent level.
771 : */
772 84 : if ((existing_isInternal || existing_isClone) &&
773 60 : !isInternal && !in_partition)
774 6 : ereport(ERROR,
775 : (errcode(ERRCODE_DUPLICATE_OBJECT),
776 : errmsg("trigger \"%s\" for relation \"%s\" is an internal or a child trigger",
777 : stmt->trigname, RelationGetRelationName(rel))));
778 :
779 : /*
780 : * It is not allowed to replace with a constraint trigger; gram.y
781 : * should have enforced this already.
782 : */
783 : Assert(!stmt->isconstraint);
784 :
785 : /*
786 : * It is not allowed to replace an existing constraint trigger,
787 : * either. (The reason for these restrictions is partly that it seems
788 : * difficult to deal with pending trigger events in such cases, and
789 : * partly that the command might imply changing the constraint's
790 : * properties as well, which doesn't seem nice.)
791 : */
792 78 : if (OidIsValid(existing_constraint_oid))
793 0 : ereport(ERROR,
794 : (errcode(ERRCODE_DUPLICATE_OBJECT),
795 : errmsg("trigger \"%s\" for relation \"%s\" is a constraint trigger",
796 : stmt->trigname, RelationGetRelationName(rel))));
797 : }
798 :
799 : /*
800 : * If it's a user-entered CREATE CONSTRAINT TRIGGER command, make a
801 : * corresponding pg_constraint entry.
802 : */
803 14076 : if (stmt->isconstraint && !OidIsValid(constraintOid))
804 : {
805 : /* Internal callers should have made their own constraints */
806 : Assert(!isInternal);
807 150 : constraintOid = CreateConstraintEntry(stmt->trigname,
808 150 : RelationGetNamespace(rel),
809 : CONSTRAINT_TRIGGER,
810 150 : stmt->deferrable,
811 150 : stmt->initdeferred,
812 : true,
813 : InvalidOid, /* no parent */
814 : RelationGetRelid(rel),
815 : NULL, /* no conkey */
816 : 0,
817 : 0,
818 : InvalidOid, /* no domain */
819 : InvalidOid, /* no index */
820 : InvalidOid, /* no foreign key */
821 : NULL,
822 : NULL,
823 : NULL,
824 : NULL,
825 : 0,
826 : ' ',
827 : ' ',
828 : NULL,
829 : 0,
830 : ' ',
831 : NULL, /* no exclusion */
832 : NULL, /* no check constraint */
833 : NULL,
834 : true, /* islocal */
835 : 0, /* inhcount */
836 : true, /* noinherit */
837 : isInternal); /* is_internal */
838 : }
839 :
840 : /*
841 : * If trigger is internally generated, modify the provided trigger name to
842 : * ensure uniqueness by appending the trigger OID. (Callers will usually
843 : * supply a simple constant trigger name in these cases.)
844 : */
845 14076 : if (isInternal)
846 : {
847 10300 : snprintf(internaltrigname, sizeof(internaltrigname),
848 : "%s_%u", stmt->trigname, trigoid);
849 10300 : trigname = internaltrigname;
850 : }
851 : else
852 : {
853 : /* user-defined trigger; use the specified trigger name as-is */
854 3776 : trigname = stmt->trigname;
855 : }
856 :
857 : /*
858 : * Build the new pg_trigger tuple.
859 : */
860 14076 : memset(nulls, false, sizeof(nulls));
861 :
862 14076 : values[Anum_pg_trigger_oid - 1] = ObjectIdGetDatum(trigoid);
863 14076 : values[Anum_pg_trigger_tgrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
864 14076 : values[Anum_pg_trigger_tgparentid - 1] = ObjectIdGetDatum(parentTriggerOid);
865 14076 : values[Anum_pg_trigger_tgname - 1] = DirectFunctionCall1(namein,
866 : CStringGetDatum(trigname));
867 14076 : values[Anum_pg_trigger_tgfoid - 1] = ObjectIdGetDatum(funcoid);
868 14076 : values[Anum_pg_trigger_tgtype - 1] = Int16GetDatum(tgtype);
869 14076 : values[Anum_pg_trigger_tgenabled - 1] = trigger_fires_when;
870 14076 : values[Anum_pg_trigger_tgisinternal - 1] = BoolGetDatum(isInternal);
871 14076 : values[Anum_pg_trigger_tgconstrrelid - 1] = ObjectIdGetDatum(constrrelid);
872 14076 : values[Anum_pg_trigger_tgconstrindid - 1] = ObjectIdGetDatum(indexOid);
873 14076 : values[Anum_pg_trigger_tgconstraint - 1] = ObjectIdGetDatum(constraintOid);
874 14076 : values[Anum_pg_trigger_tgdeferrable - 1] = BoolGetDatum(stmt->deferrable);
875 14076 : values[Anum_pg_trigger_tginitdeferred - 1] = BoolGetDatum(stmt->initdeferred);
876 :
877 14076 : if (stmt->args)
878 : {
879 : ListCell *le;
880 : char *args;
881 568 : int16 nargs = list_length(stmt->args);
882 568 : int len = 0;
883 :
884 1418 : foreach(le, stmt->args)
885 : {
886 850 : char *ar = strVal(lfirst(le));
887 :
888 850 : len += strlen(ar) + 4;
889 7250 : for (; *ar; ar++)
890 : {
891 6400 : if (*ar == '\\')
892 0 : len++;
893 : }
894 : }
895 568 : args = (char *) palloc(len + 1);
896 568 : args[0] = '\0';
897 1418 : foreach(le, stmt->args)
898 : {
899 850 : char *s = strVal(lfirst(le));
900 850 : char *d = args + strlen(args);
901 :
902 7250 : while (*s)
903 : {
904 6400 : if (*s == '\\')
905 0 : *d++ = '\\';
906 6400 : *d++ = *s++;
907 : }
908 850 : strcpy(d, "\\000");
909 : }
910 568 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(nargs);
911 568 : values[Anum_pg_trigger_tgargs - 1] = DirectFunctionCall1(byteain,
912 : CStringGetDatum(args));
913 : }
914 : else
915 : {
916 13508 : values[Anum_pg_trigger_tgnargs - 1] = Int16GetDatum(0);
917 13508 : values[Anum_pg_trigger_tgargs - 1] = DirectFunctionCall1(byteain,
918 : CStringGetDatum(""));
919 : }
920 :
921 : /* build column number array if it's a column-specific trigger */
922 14076 : ncolumns = list_length(stmt->columns);
923 14076 : if (ncolumns == 0)
924 13976 : columns = NULL;
925 : else
926 : {
927 : ListCell *cell;
928 100 : int i = 0;
929 :
930 100 : columns = (int16 *) palloc(ncolumns * sizeof(int16));
931 208 : foreach(cell, stmt->columns)
932 : {
933 114 : char *name = strVal(lfirst(cell));
934 : int16 attnum;
935 : int j;
936 :
937 : /* Lookup column name. System columns are not allowed */
938 114 : attnum = attnameAttNum(rel, name, false);
939 114 : if (attnum == InvalidAttrNumber)
940 0 : ereport(ERROR,
941 : (errcode(ERRCODE_UNDEFINED_COLUMN),
942 : errmsg("column \"%s\" of relation \"%s\" does not exist",
943 : name, RelationGetRelationName(rel))));
944 :
945 : /* Check for duplicates */
946 122 : for (j = i - 1; j >= 0; j--)
947 : {
948 14 : if (columns[j] == attnum)
949 6 : ereport(ERROR,
950 : (errcode(ERRCODE_DUPLICATE_COLUMN),
951 : errmsg("column \"%s\" specified more than once",
952 : name)));
953 : }
954 :
955 108 : columns[i++] = attnum;
956 : }
957 : }
958 14070 : tgattr = buildint2vector(columns, ncolumns);
959 14070 : values[Anum_pg_trigger_tgattr - 1] = PointerGetDatum(tgattr);
960 :
961 : /* set tgqual if trigger has WHEN clause */
962 14070 : if (qual)
963 152 : values[Anum_pg_trigger_tgqual - 1] = CStringGetTextDatum(qual);
964 : else
965 13918 : nulls[Anum_pg_trigger_tgqual - 1] = true;
966 :
967 14070 : if (oldtablename)
968 232 : values[Anum_pg_trigger_tgoldtable - 1] = DirectFunctionCall1(namein,
969 : CStringGetDatum(oldtablename));
970 : else
971 13838 : nulls[Anum_pg_trigger_tgoldtable - 1] = true;
972 14070 : if (newtablename)
973 264 : values[Anum_pg_trigger_tgnewtable - 1] = DirectFunctionCall1(namein,
974 : CStringGetDatum(newtablename));
975 : else
976 13806 : nulls[Anum_pg_trigger_tgnewtable - 1] = true;
977 :
978 : /*
979 : * Insert or replace tuple in pg_trigger.
980 : */
981 14070 : if (!trigger_exists)
982 : {
983 13992 : tuple = heap_form_tuple(tgrel->rd_att, values, nulls);
984 13992 : CatalogTupleInsert(tgrel, tuple);
985 : }
986 : else
987 : {
988 : HeapTuple newtup;
989 :
990 78 : newtup = heap_form_tuple(tgrel->rd_att, values, nulls);
991 78 : CatalogTupleUpdate(tgrel, &tuple->t_self, newtup);
992 78 : heap_freetuple(newtup);
993 : }
994 :
995 14070 : heap_freetuple(tuple); /* free either original or new tuple */
996 14070 : table_close(tgrel, RowExclusiveLock);
997 :
998 14070 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgname - 1]));
999 14070 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgargs - 1]));
1000 14070 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgattr - 1]));
1001 14070 : if (oldtablename)
1002 232 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgoldtable - 1]));
1003 14070 : if (newtablename)
1004 264 : pfree(DatumGetPointer(values[Anum_pg_trigger_tgnewtable - 1]));
1005 :
1006 : /*
1007 : * Update relation's pg_class entry; if necessary; and if not, send an SI
1008 : * message to make other backends (and this one) rebuild relcache entries.
1009 : */
1010 14070 : pgrel = table_open(RelationRelationId, RowExclusiveLock);
1011 14070 : tuple = SearchSysCacheCopy1(RELOID,
1012 : ObjectIdGetDatum(RelationGetRelid(rel)));
1013 14070 : if (!HeapTupleIsValid(tuple))
1014 0 : elog(ERROR, "cache lookup failed for relation %u",
1015 : RelationGetRelid(rel));
1016 14070 : if (!((Form_pg_class) GETSTRUCT(tuple))->relhastriggers)
1017 : {
1018 5806 : ((Form_pg_class) GETSTRUCT(tuple))->relhastriggers = true;
1019 :
1020 5806 : CatalogTupleUpdate(pgrel, &tuple->t_self, tuple);
1021 :
1022 5806 : CommandCounterIncrement();
1023 : }
1024 : else
1025 8264 : CacheInvalidateRelcacheByTuple(tuple);
1026 :
1027 14070 : heap_freetuple(tuple);
1028 14070 : table_close(pgrel, RowExclusiveLock);
1029 :
1030 : /*
1031 : * If we're replacing a trigger, flush all the old dependencies before
1032 : * recording new ones.
1033 : */
1034 14070 : if (trigger_exists)
1035 78 : deleteDependencyRecordsFor(TriggerRelationId, trigoid, true);
1036 :
1037 : /*
1038 : * Record dependencies for trigger. Always place a normal dependency on
1039 : * the function.
1040 : */
1041 14070 : myself.classId = TriggerRelationId;
1042 14070 : myself.objectId = trigoid;
1043 14070 : myself.objectSubId = 0;
1044 :
1045 14070 : referenced.classId = ProcedureRelationId;
1046 14070 : referenced.objectId = funcoid;
1047 14070 : referenced.objectSubId = 0;
1048 14070 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1049 :
1050 14070 : if (isInternal && OidIsValid(constraintOid))
1051 : {
1052 : /*
1053 : * Internally-generated trigger for a constraint, so make it an
1054 : * internal dependency of the constraint. We can skip depending on
1055 : * the relation(s), as there'll be an indirect dependency via the
1056 : * constraint.
1057 : */
1058 10300 : referenced.classId = ConstraintRelationId;
1059 10300 : referenced.objectId = constraintOid;
1060 10300 : referenced.objectSubId = 0;
1061 10300 : recordDependencyOn(&myself, &referenced, DEPENDENCY_INTERNAL);
1062 : }
1063 : else
1064 : {
1065 : /*
1066 : * User CREATE TRIGGER, so place dependencies. We make trigger be
1067 : * auto-dropped if its relation is dropped or if the FK relation is
1068 : * dropped. (Auto drop is compatible with our pre-7.3 behavior.)
1069 : */
1070 3770 : referenced.classId = RelationRelationId;
1071 3770 : referenced.objectId = RelationGetRelid(rel);
1072 3770 : referenced.objectSubId = 0;
1073 3770 : recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
1074 :
1075 3770 : if (OidIsValid(constrrelid))
1076 : {
1077 42 : referenced.classId = RelationRelationId;
1078 42 : referenced.objectId = constrrelid;
1079 42 : referenced.objectSubId = 0;
1080 42 : recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
1081 : }
1082 : /* Not possible to have an index dependency in this case */
1083 : Assert(!OidIsValid(indexOid));
1084 :
1085 : /*
1086 : * If it's a user-specified constraint trigger, make the constraint
1087 : * internally dependent on the trigger instead of vice versa.
1088 : */
1089 3770 : if (OidIsValid(constraintOid))
1090 : {
1091 150 : referenced.classId = ConstraintRelationId;
1092 150 : referenced.objectId = constraintOid;
1093 150 : referenced.objectSubId = 0;
1094 150 : recordDependencyOn(&referenced, &myself, DEPENDENCY_INTERNAL);
1095 : }
1096 :
1097 : /*
1098 : * If it's a partition trigger, create the partition dependencies.
1099 : */
1100 3770 : if (OidIsValid(parentTriggerOid))
1101 : {
1102 864 : ObjectAddressSet(referenced, TriggerRelationId, parentTriggerOid);
1103 864 : recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_PRI);
1104 864 : ObjectAddressSet(referenced, RelationRelationId, RelationGetRelid(rel));
1105 864 : recordDependencyOn(&myself, &referenced, DEPENDENCY_PARTITION_SEC);
1106 : }
1107 : }
1108 :
1109 : /* If column-specific trigger, add normal dependencies on columns */
1110 14070 : if (columns != NULL)
1111 : {
1112 : int i;
1113 :
1114 94 : referenced.classId = RelationRelationId;
1115 94 : referenced.objectId = RelationGetRelid(rel);
1116 196 : for (i = 0; i < ncolumns; i++)
1117 : {
1118 102 : referenced.objectSubId = columns[i];
1119 102 : recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
1120 : }
1121 : }
1122 :
1123 : /*
1124 : * If it has a WHEN clause, add dependencies on objects mentioned in the
1125 : * expression (eg, functions, as well as any columns used).
1126 : */
1127 14070 : if (whenRtable != NIL)
1128 110 : recordDependencyOnExpr(&myself, whenClause, whenRtable,
1129 : DEPENDENCY_NORMAL);
1130 :
1131 : /* Post creation hook for new trigger */
1132 14070 : InvokeObjectPostCreateHookArg(TriggerRelationId, trigoid, 0,
1133 : isInternal);
1134 :
1135 : /*
1136 : * Lastly, create the trigger on child relations, if needed.
1137 : */
1138 14070 : if (partition_recurse)
1139 : {
1140 398 : PartitionDesc partdesc = RelationGetPartitionDesc(rel, true);
1141 : int i;
1142 : MemoryContext oldcxt,
1143 : perChildCxt;
1144 :
1145 398 : perChildCxt = AllocSetContextCreate(CurrentMemoryContext,
1146 : "part trig clone",
1147 : ALLOCSET_SMALL_SIZES);
1148 :
1149 : /*
1150 : * We don't currently expect to be called with a valid indexOid. If
1151 : * that ever changes then we'll need to write code here to find the
1152 : * corresponding child index.
1153 : */
1154 : Assert(!OidIsValid(indexOid));
1155 :
1156 398 : oldcxt = MemoryContextSwitchTo(perChildCxt);
1157 :
1158 : /* Iterate to create the trigger on each existing partition */
1159 1088 : for (i = 0; i < partdesc->nparts; i++)
1160 : {
1161 : CreateTrigStmt *childStmt;
1162 : Relation childTbl;
1163 : Node *qual;
1164 :
1165 696 : childTbl = table_open(partdesc->oids[i], ShareRowExclusiveLock);
1166 :
1167 : /*
1168 : * Initialize our fabricated parse node by copying the original
1169 : * one, then resetting fields that we pass separately.
1170 : */
1171 696 : childStmt = (CreateTrigStmt *) copyObject(stmt);
1172 696 : childStmt->funcname = NIL;
1173 696 : childStmt->whenClause = NULL;
1174 :
1175 : /* If there is a WHEN clause, create a modified copy of it */
1176 696 : qual = copyObject(whenClause);
1177 : qual = (Node *)
1178 696 : map_partition_varattnos((List *) qual, PRS2_OLD_VARNO,
1179 : childTbl, rel);
1180 : qual = (Node *)
1181 696 : map_partition_varattnos((List *) qual, PRS2_NEW_VARNO,
1182 : childTbl, rel);
1183 :
1184 696 : CreateTriggerFiringOn(childStmt, queryString,
1185 696 : partdesc->oids[i], refRelOid,
1186 : InvalidOid, InvalidOid,
1187 : funcoid, trigoid, qual,
1188 : isInternal, true, trigger_fires_when);
1189 :
1190 690 : table_close(childTbl, NoLock);
1191 :
1192 690 : MemoryContextReset(perChildCxt);
1193 : }
1194 :
1195 392 : MemoryContextSwitchTo(oldcxt);
1196 392 : MemoryContextDelete(perChildCxt);
1197 : }
1198 :
1199 : /* Keep lock on target rel until end of xact */
1200 14064 : table_close(rel, NoLock);
1201 :
1202 14064 : return myself;
1203 : }
1204 :
1205 : /*
1206 : * TriggerSetParentTrigger
1207 : * Set a partition's trigger as child of its parent trigger,
1208 : * or remove the linkage if parentTrigId is InvalidOid.
1209 : *
1210 : * This updates the constraint's pg_trigger row to show it as inherited, and
1211 : * adds PARTITION dependencies to prevent the trigger from being deleted
1212 : * on its own. Alternatively, reverse that.
1213 : */
1214 : void
1215 288 : TriggerSetParentTrigger(Relation trigRel,
1216 : Oid childTrigId,
1217 : Oid parentTrigId,
1218 : Oid childTableId)
1219 : {
1220 : SysScanDesc tgscan;
1221 : ScanKeyData skey[1];
1222 : Form_pg_trigger trigForm;
1223 : HeapTuple tuple,
1224 : newtup;
1225 : ObjectAddress depender;
1226 : ObjectAddress referenced;
1227 :
1228 : /*
1229 : * Find the trigger to delete.
1230 : */
1231 288 : ScanKeyInit(&skey[0],
1232 : Anum_pg_trigger_oid,
1233 : BTEqualStrategyNumber, F_OIDEQ,
1234 : ObjectIdGetDatum(childTrigId));
1235 :
1236 288 : tgscan = systable_beginscan(trigRel, TriggerOidIndexId, true,
1237 : NULL, 1, skey);
1238 :
1239 288 : tuple = systable_getnext(tgscan);
1240 288 : if (!HeapTupleIsValid(tuple))
1241 0 : elog(ERROR, "could not find tuple for trigger %u", childTrigId);
1242 288 : newtup = heap_copytuple(tuple);
1243 288 : trigForm = (Form_pg_trigger) GETSTRUCT(newtup);
1244 288 : if (OidIsValid(parentTrigId))
1245 : {
1246 : /* don't allow setting parent for a constraint that already has one */
1247 156 : if (OidIsValid(trigForm->tgparentid))
1248 0 : elog(ERROR, "trigger %u already has a parent trigger",
1249 : childTrigId);
1250 :
1251 156 : trigForm->tgparentid = parentTrigId;
1252 :
1253 156 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1254 :
1255 156 : ObjectAddressSet(depender, TriggerRelationId, childTrigId);
1256 :
1257 156 : ObjectAddressSet(referenced, TriggerRelationId, parentTrigId);
1258 156 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_PRI);
1259 :
1260 156 : ObjectAddressSet(referenced, RelationRelationId, childTableId);
1261 156 : recordDependencyOn(&depender, &referenced, DEPENDENCY_PARTITION_SEC);
1262 : }
1263 : else
1264 : {
1265 132 : trigForm->tgparentid = InvalidOid;
1266 :
1267 132 : CatalogTupleUpdate(trigRel, &tuple->t_self, newtup);
1268 :
1269 132 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1270 : TriggerRelationId,
1271 : DEPENDENCY_PARTITION_PRI);
1272 132 : deleteDependencyRecordsForClass(TriggerRelationId, childTrigId,
1273 : RelationRelationId,
1274 : DEPENDENCY_PARTITION_SEC);
1275 : }
1276 :
1277 288 : heap_freetuple(newtup);
1278 288 : systable_endscan(tgscan);
1279 288 : }
1280 :
1281 :
1282 : /*
1283 : * Guts of trigger deletion.
1284 : */
1285 : void
1286 11752 : RemoveTriggerById(Oid trigOid)
1287 : {
1288 : Relation tgrel;
1289 : SysScanDesc tgscan;
1290 : ScanKeyData skey[1];
1291 : HeapTuple tup;
1292 : Oid relid;
1293 : Relation rel;
1294 :
1295 11752 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1296 :
1297 : /*
1298 : * Find the trigger to delete.
1299 : */
1300 11752 : ScanKeyInit(&skey[0],
1301 : Anum_pg_trigger_oid,
1302 : BTEqualStrategyNumber, F_OIDEQ,
1303 : ObjectIdGetDatum(trigOid));
1304 :
1305 11752 : tgscan = systable_beginscan(tgrel, TriggerOidIndexId, true,
1306 : NULL, 1, skey);
1307 :
1308 11752 : tup = systable_getnext(tgscan);
1309 11752 : if (!HeapTupleIsValid(tup))
1310 0 : elog(ERROR, "could not find tuple for trigger %u", trigOid);
1311 :
1312 : /*
1313 : * Open and exclusive-lock the relation the trigger belongs to.
1314 : */
1315 11752 : relid = ((Form_pg_trigger) GETSTRUCT(tup))->tgrelid;
1316 :
1317 11752 : rel = table_open(relid, AccessExclusiveLock);
1318 :
1319 11752 : if (rel->rd_rel->relkind != RELKIND_RELATION &&
1320 1976 : rel->rd_rel->relkind != RELKIND_VIEW &&
1321 1846 : rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
1322 1754 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
1323 0 : ereport(ERROR,
1324 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1325 : errmsg("relation \"%s\" cannot have triggers",
1326 : RelationGetRelationName(rel)),
1327 : errdetail_relkind_not_supported(rel->rd_rel->relkind)));
1328 :
1329 11752 : if (!allowSystemTableMods && IsSystemRelation(rel))
1330 0 : ereport(ERROR,
1331 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1332 : errmsg("permission denied: \"%s\" is a system catalog",
1333 : RelationGetRelationName(rel))));
1334 :
1335 : /*
1336 : * Delete the pg_trigger tuple.
1337 : */
1338 11752 : CatalogTupleDelete(tgrel, &tup->t_self);
1339 :
1340 11752 : systable_endscan(tgscan);
1341 11752 : table_close(tgrel, RowExclusiveLock);
1342 :
1343 : /*
1344 : * We do not bother to try to determine whether any other triggers remain,
1345 : * which would be needed in order to decide whether it's safe to clear the
1346 : * relation's relhastriggers. (In any case, there might be a concurrent
1347 : * process adding new triggers.) Instead, just force a relcache inval to
1348 : * make other backends (and this one too!) rebuild their relcache entries.
1349 : * There's no great harm in leaving relhastriggers true even if there are
1350 : * no triggers left.
1351 : */
1352 11752 : CacheInvalidateRelcache(rel);
1353 :
1354 : /* Keep lock on trigger's rel until end of xact */
1355 11752 : table_close(rel, NoLock);
1356 11752 : }
1357 :
1358 : /*
1359 : * get_trigger_oid - Look up a trigger by name to find its OID.
1360 : *
1361 : * If missing_ok is false, throw an error if trigger not found. If
1362 : * true, just return InvalidOid.
1363 : */
1364 : Oid
1365 752 : get_trigger_oid(Oid relid, const char *trigname, bool missing_ok)
1366 : {
1367 : Relation tgrel;
1368 : ScanKeyData skey[2];
1369 : SysScanDesc tgscan;
1370 : HeapTuple tup;
1371 : Oid oid;
1372 :
1373 : /*
1374 : * Find the trigger, verify permissions, set up object address
1375 : */
1376 752 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1377 :
1378 752 : ScanKeyInit(&skey[0],
1379 : Anum_pg_trigger_tgrelid,
1380 : BTEqualStrategyNumber, F_OIDEQ,
1381 : ObjectIdGetDatum(relid));
1382 752 : ScanKeyInit(&skey[1],
1383 : Anum_pg_trigger_tgname,
1384 : BTEqualStrategyNumber, F_NAMEEQ,
1385 : CStringGetDatum(trigname));
1386 :
1387 752 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1388 : NULL, 2, skey);
1389 :
1390 752 : tup = systable_getnext(tgscan);
1391 :
1392 752 : if (!HeapTupleIsValid(tup))
1393 : {
1394 30 : if (!missing_ok)
1395 24 : ereport(ERROR,
1396 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1397 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1398 : trigname, get_rel_name(relid))));
1399 6 : oid = InvalidOid;
1400 : }
1401 : else
1402 : {
1403 722 : oid = ((Form_pg_trigger) GETSTRUCT(tup))->oid;
1404 : }
1405 :
1406 728 : systable_endscan(tgscan);
1407 728 : table_close(tgrel, AccessShareLock);
1408 728 : return oid;
1409 : }
1410 :
1411 : /*
1412 : * Perform permissions and integrity checks before acquiring a relation lock.
1413 : */
1414 : static void
1415 42 : RangeVarCallbackForRenameTrigger(const RangeVar *rv, Oid relid, Oid oldrelid,
1416 : void *arg)
1417 : {
1418 : HeapTuple tuple;
1419 : Form_pg_class form;
1420 :
1421 42 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
1422 42 : if (!HeapTupleIsValid(tuple))
1423 0 : return; /* concurrently dropped */
1424 42 : form = (Form_pg_class) GETSTRUCT(tuple);
1425 :
1426 : /* only tables and views can have triggers */
1427 42 : if (form->relkind != RELKIND_RELATION && form->relkind != RELKIND_VIEW &&
1428 26 : form->relkind != RELKIND_FOREIGN_TABLE &&
1429 26 : form->relkind != RELKIND_PARTITIONED_TABLE)
1430 0 : ereport(ERROR,
1431 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1432 : errmsg("relation \"%s\" cannot have triggers",
1433 : rv->relname),
1434 : errdetail_relkind_not_supported(form->relkind)));
1435 :
1436 : /* you must own the table to rename one of its triggers */
1437 42 : if (!object_ownercheck(RelationRelationId, relid, GetUserId()))
1438 0 : aclcheck_error(ACLCHECK_NOT_OWNER, get_relkind_objtype(get_rel_relkind(relid)), rv->relname);
1439 42 : if (!allowSystemTableMods && IsSystemClass(relid, form))
1440 2 : ereport(ERROR,
1441 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1442 : errmsg("permission denied: \"%s\" is a system catalog",
1443 : rv->relname)));
1444 :
1445 40 : ReleaseSysCache(tuple);
1446 : }
1447 :
1448 : /*
1449 : * renametrig - changes the name of a trigger on a relation
1450 : *
1451 : * trigger name is changed in trigger catalog.
1452 : * No record of the previous name is kept.
1453 : *
1454 : * get proper relrelation from relation catalog (if not arg)
1455 : * scan trigger catalog
1456 : * for name conflict (within rel)
1457 : * for original trigger (if not arg)
1458 : * modify tgname in trigger tuple
1459 : * update row in catalog
1460 : */
1461 : ObjectAddress
1462 40 : renametrig(RenameStmt *stmt)
1463 : {
1464 : Oid tgoid;
1465 : Relation targetrel;
1466 : Relation tgrel;
1467 : HeapTuple tuple;
1468 : SysScanDesc tgscan;
1469 : ScanKeyData key[2];
1470 : Oid relid;
1471 : ObjectAddress address;
1472 :
1473 : /*
1474 : * Look up name, check permissions, and acquire lock (which we will NOT
1475 : * release until end of transaction).
1476 : */
1477 40 : relid = RangeVarGetRelidExtended(stmt->relation, AccessExclusiveLock,
1478 : 0,
1479 : RangeVarCallbackForRenameTrigger,
1480 : NULL);
1481 :
1482 : /* Have lock already, so just need to build relcache entry. */
1483 38 : targetrel = relation_open(relid, NoLock);
1484 :
1485 : /*
1486 : * On partitioned tables, this operation recurses to partitions. Lock all
1487 : * tables upfront.
1488 : */
1489 38 : if (targetrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1490 24 : (void) find_all_inheritors(relid, AccessExclusiveLock, NULL);
1491 :
1492 38 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1493 :
1494 : /*
1495 : * Search for the trigger to modify.
1496 : */
1497 38 : ScanKeyInit(&key[0],
1498 : Anum_pg_trigger_tgrelid,
1499 : BTEqualStrategyNumber, F_OIDEQ,
1500 : ObjectIdGetDatum(relid));
1501 38 : ScanKeyInit(&key[1],
1502 : Anum_pg_trigger_tgname,
1503 : BTEqualStrategyNumber, F_NAMEEQ,
1504 38 : PointerGetDatum(stmt->subname));
1505 38 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1506 : NULL, 2, key);
1507 38 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1508 : {
1509 : Form_pg_trigger trigform;
1510 :
1511 38 : trigform = (Form_pg_trigger) GETSTRUCT(tuple);
1512 38 : tgoid = trigform->oid;
1513 :
1514 : /*
1515 : * If the trigger descends from a trigger on a parent partitioned
1516 : * table, reject the rename. We don't allow a trigger in a partition
1517 : * to differ in name from that of its parent: that would lead to an
1518 : * inconsistency that pg_dump would not reproduce.
1519 : */
1520 38 : if (OidIsValid(trigform->tgparentid))
1521 6 : ereport(ERROR,
1522 : errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1523 : errmsg("cannot rename trigger \"%s\" on table \"%s\"",
1524 : stmt->subname, RelationGetRelationName(targetrel)),
1525 : errhint("Rename the trigger on the partitioned table \"%s\" instead.",
1526 : get_rel_name(get_partition_parent(relid, false))));
1527 :
1528 :
1529 : /* Rename the trigger on this relation ... */
1530 32 : renametrig_internal(tgrel, targetrel, tuple, stmt->newname,
1531 32 : stmt->subname);
1532 :
1533 : /* ... and if it is partitioned, recurse to its partitions */
1534 32 : if (targetrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1535 : {
1536 18 : PartitionDesc partdesc = RelationGetPartitionDesc(targetrel, true);
1537 :
1538 30 : for (int i = 0; i < partdesc->nparts; i++)
1539 : {
1540 18 : Oid partitionId = partdesc->oids[i];
1541 :
1542 18 : renametrig_partition(tgrel, partitionId, trigform->oid,
1543 18 : stmt->newname, stmt->subname);
1544 : }
1545 : }
1546 : }
1547 : else
1548 : {
1549 0 : ereport(ERROR,
1550 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1551 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1552 : stmt->subname, RelationGetRelationName(targetrel))));
1553 : }
1554 :
1555 26 : ObjectAddressSet(address, TriggerRelationId, tgoid);
1556 :
1557 26 : systable_endscan(tgscan);
1558 :
1559 26 : table_close(tgrel, RowExclusiveLock);
1560 :
1561 : /*
1562 : * Close rel, but keep exclusive lock!
1563 : */
1564 26 : relation_close(targetrel, NoLock);
1565 :
1566 26 : return address;
1567 : }
1568 :
1569 : /*
1570 : * Subroutine for renametrig -- perform the actual work of renaming one
1571 : * trigger on one table.
1572 : *
1573 : * If the trigger has a name different from the expected one, raise a
1574 : * NOTICE about it.
1575 : */
1576 : static void
1577 56 : renametrig_internal(Relation tgrel, Relation targetrel, HeapTuple trigtup,
1578 : const char *newname, const char *expected_name)
1579 : {
1580 : HeapTuple tuple;
1581 : Form_pg_trigger tgform;
1582 : ScanKeyData key[2];
1583 : SysScanDesc tgscan;
1584 :
1585 : /* If the trigger already has the new name, nothing to do. */
1586 56 : tgform = (Form_pg_trigger) GETSTRUCT(trigtup);
1587 56 : if (strcmp(NameStr(tgform->tgname), newname) == 0)
1588 0 : return;
1589 :
1590 : /*
1591 : * Before actually trying the rename, search for triggers with the same
1592 : * name. The update would fail with an ugly message in that case, and it
1593 : * is better to throw a nicer error.
1594 : */
1595 56 : ScanKeyInit(&key[0],
1596 : Anum_pg_trigger_tgrelid,
1597 : BTEqualStrategyNumber, F_OIDEQ,
1598 : ObjectIdGetDatum(RelationGetRelid(targetrel)));
1599 56 : ScanKeyInit(&key[1],
1600 : Anum_pg_trigger_tgname,
1601 : BTEqualStrategyNumber, F_NAMEEQ,
1602 : PointerGetDatum(newname));
1603 56 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1604 : NULL, 2, key);
1605 56 : if (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1606 6 : ereport(ERROR,
1607 : (errcode(ERRCODE_DUPLICATE_OBJECT),
1608 : errmsg("trigger \"%s\" for relation \"%s\" already exists",
1609 : newname, RelationGetRelationName(targetrel))));
1610 50 : systable_endscan(tgscan);
1611 :
1612 : /*
1613 : * The target name is free; update the existing pg_trigger tuple with it.
1614 : */
1615 50 : tuple = heap_copytuple(trigtup); /* need a modifiable copy */
1616 50 : tgform = (Form_pg_trigger) GETSTRUCT(tuple);
1617 :
1618 : /*
1619 : * If the trigger has a name different from what we expected, let the user
1620 : * know. (We can proceed anyway, since we must have reached here following
1621 : * a tgparentid link.)
1622 : */
1623 50 : if (strcmp(NameStr(tgform->tgname), expected_name) != 0)
1624 0 : ereport(NOTICE,
1625 : errmsg("renamed trigger \"%s\" on relation \"%s\"",
1626 : NameStr(tgform->tgname),
1627 : RelationGetRelationName(targetrel)));
1628 :
1629 50 : namestrcpy(&tgform->tgname, newname);
1630 :
1631 50 : CatalogTupleUpdate(tgrel, &tuple->t_self, tuple);
1632 :
1633 50 : InvokeObjectPostAlterHook(TriggerRelationId, tgform->oid, 0);
1634 :
1635 : /*
1636 : * Invalidate relation's relcache entry so that other backends (and this
1637 : * one too!) are sent SI message to make them rebuild relcache entries.
1638 : * (Ideally this should happen automatically...)
1639 : */
1640 50 : CacheInvalidateRelcache(targetrel);
1641 : }
1642 :
1643 : /*
1644 : * Subroutine for renametrig -- Helper for recursing to partitions when
1645 : * renaming triggers on a partitioned table.
1646 : */
1647 : static void
1648 30 : renametrig_partition(Relation tgrel, Oid partitionId, Oid parentTriggerOid,
1649 : const char *newname, const char *expected_name)
1650 : {
1651 : SysScanDesc tgscan;
1652 : ScanKeyData key;
1653 : HeapTuple tuple;
1654 :
1655 : /*
1656 : * Given a relation and the OID of a trigger on parent relation, find the
1657 : * corresponding trigger in the child and rename that trigger to the given
1658 : * name.
1659 : */
1660 30 : ScanKeyInit(&key,
1661 : Anum_pg_trigger_tgrelid,
1662 : BTEqualStrategyNumber, F_OIDEQ,
1663 : ObjectIdGetDatum(partitionId));
1664 30 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1665 : NULL, 1, &key);
1666 48 : while (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1667 : {
1668 42 : Form_pg_trigger tgform = (Form_pg_trigger) GETSTRUCT(tuple);
1669 : Relation partitionRel;
1670 :
1671 42 : if (tgform->tgparentid != parentTriggerOid)
1672 18 : continue; /* not our trigger */
1673 :
1674 24 : partitionRel = table_open(partitionId, NoLock);
1675 :
1676 : /* Rename the trigger on this partition */
1677 24 : renametrig_internal(tgrel, partitionRel, tuple, newname, expected_name);
1678 :
1679 : /* And if this relation is partitioned, recurse to its partitions */
1680 18 : if (partitionRel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
1681 : {
1682 6 : PartitionDesc partdesc = RelationGetPartitionDesc(partitionRel,
1683 : true);
1684 :
1685 18 : for (int i = 0; i < partdesc->nparts; i++)
1686 : {
1687 12 : Oid partoid = partdesc->oids[i];
1688 :
1689 12 : renametrig_partition(tgrel, partoid, tgform->oid, newname,
1690 12 : NameStr(tgform->tgname));
1691 : }
1692 : }
1693 18 : table_close(partitionRel, NoLock);
1694 :
1695 : /* There should be at most one matching tuple */
1696 18 : break;
1697 : }
1698 24 : systable_endscan(tgscan);
1699 24 : }
1700 :
1701 : /*
1702 : * EnableDisableTrigger()
1703 : *
1704 : * Called by ALTER TABLE ENABLE/DISABLE [ REPLICA | ALWAYS ] TRIGGER
1705 : * to change 'tgenabled' field for the specified trigger(s)
1706 : *
1707 : * rel: relation to process (caller must hold suitable lock on it)
1708 : * tgname: name of trigger to process, or NULL to scan all triggers
1709 : * tgparent: if not zero, process only triggers with this tgparentid
1710 : * fires_when: new value for tgenabled field. In addition to generic
1711 : * enablement/disablement, this also defines when the trigger
1712 : * should be fired in session replication roles.
1713 : * skip_system: if true, skip "system" triggers (constraint triggers)
1714 : * recurse: if true, recurse to partitions
1715 : *
1716 : * Caller should have checked permissions for the table; here we also
1717 : * enforce that superuser privilege is required to alter the state of
1718 : * system triggers
1719 : */
1720 : void
1721 450 : EnableDisableTrigger(Relation rel, const char *tgname, Oid tgparent,
1722 : char fires_when, bool skip_system, bool recurse,
1723 : LOCKMODE lockmode)
1724 : {
1725 : Relation tgrel;
1726 : int nkeys;
1727 : ScanKeyData keys[2];
1728 : SysScanDesc tgscan;
1729 : HeapTuple tuple;
1730 : bool found;
1731 : bool changed;
1732 :
1733 : /* Scan the relevant entries in pg_triggers */
1734 450 : tgrel = table_open(TriggerRelationId, RowExclusiveLock);
1735 :
1736 450 : ScanKeyInit(&keys[0],
1737 : Anum_pg_trigger_tgrelid,
1738 : BTEqualStrategyNumber, F_OIDEQ,
1739 : ObjectIdGetDatum(RelationGetRelid(rel)));
1740 450 : if (tgname)
1741 : {
1742 316 : ScanKeyInit(&keys[1],
1743 : Anum_pg_trigger_tgname,
1744 : BTEqualStrategyNumber, F_NAMEEQ,
1745 : CStringGetDatum(tgname));
1746 316 : nkeys = 2;
1747 : }
1748 : else
1749 134 : nkeys = 1;
1750 :
1751 450 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1752 : NULL, nkeys, keys);
1753 :
1754 450 : found = changed = false;
1755 :
1756 1128 : while (HeapTupleIsValid(tuple = systable_getnext(tgscan)))
1757 : {
1758 678 : Form_pg_trigger oldtrig = (Form_pg_trigger) GETSTRUCT(tuple);
1759 :
1760 678 : if (OidIsValid(tgparent) && tgparent != oldtrig->tgparentid)
1761 156 : continue;
1762 :
1763 522 : if (oldtrig->tgisinternal)
1764 : {
1765 : /* system trigger ... ok to process? */
1766 60 : if (skip_system)
1767 12 : continue;
1768 48 : if (!superuser())
1769 0 : ereport(ERROR,
1770 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1771 : errmsg("permission denied: \"%s\" is a system trigger",
1772 : NameStr(oldtrig->tgname))));
1773 : }
1774 :
1775 510 : found = true;
1776 :
1777 510 : if (oldtrig->tgenabled != fires_when)
1778 : {
1779 : /* need to change this one ... make a copy to scribble on */
1780 480 : HeapTuple newtup = heap_copytuple(tuple);
1781 480 : Form_pg_trigger newtrig = (Form_pg_trigger) GETSTRUCT(newtup);
1782 :
1783 480 : newtrig->tgenabled = fires_when;
1784 :
1785 480 : CatalogTupleUpdate(tgrel, &newtup->t_self, newtup);
1786 :
1787 480 : heap_freetuple(newtup);
1788 :
1789 480 : changed = true;
1790 : }
1791 :
1792 : /*
1793 : * When altering FOR EACH ROW triggers on a partitioned table, do the
1794 : * same on the partitions as well, unless ONLY is specified.
1795 : *
1796 : * Note that we recurse even if we didn't change the trigger above,
1797 : * because the partitions' copy of the trigger may have a different
1798 : * value of tgenabled than the parent's trigger and thus might need to
1799 : * be changed.
1800 : */
1801 510 : if (recurse &&
1802 482 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
1803 86 : (TRIGGER_FOR_ROW(oldtrig->tgtype)))
1804 : {
1805 74 : PartitionDesc partdesc = RelationGetPartitionDesc(rel, true);
1806 : int i;
1807 :
1808 184 : for (i = 0; i < partdesc->nparts; i++)
1809 : {
1810 : Relation part;
1811 :
1812 110 : part = relation_open(partdesc->oids[i], lockmode);
1813 : /* Match on child triggers' tgparentid, not their name */
1814 110 : EnableDisableTrigger(part, NULL, oldtrig->oid,
1815 : fires_when, skip_system, recurse,
1816 : lockmode);
1817 110 : table_close(part, NoLock); /* keep lock till commit */
1818 : }
1819 : }
1820 :
1821 510 : InvokeObjectPostAlterHook(TriggerRelationId,
1822 : oldtrig->oid, 0);
1823 : }
1824 :
1825 450 : systable_endscan(tgscan);
1826 :
1827 450 : table_close(tgrel, RowExclusiveLock);
1828 :
1829 450 : if (tgname && !found)
1830 0 : ereport(ERROR,
1831 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1832 : errmsg("trigger \"%s\" for table \"%s\" does not exist",
1833 : tgname, RelationGetRelationName(rel))));
1834 :
1835 : /*
1836 : * If we changed anything, broadcast a SI inval message to force each
1837 : * backend (including our own!) to rebuild relation's relcache entry.
1838 : * Otherwise they will fail to apply the change promptly.
1839 : */
1840 450 : if (changed)
1841 432 : CacheInvalidateRelcache(rel);
1842 450 : }
1843 :
1844 :
1845 : /*
1846 : * Build trigger data to attach to the given relcache entry.
1847 : *
1848 : * Note that trigger data attached to a relcache entry must be stored in
1849 : * CacheMemoryContext to ensure it survives as long as the relcache entry.
1850 : * But we should be running in a less long-lived working context. To avoid
1851 : * leaking cache memory if this routine fails partway through, we build a
1852 : * temporary TriggerDesc in working memory and then copy the completed
1853 : * structure into cache memory.
1854 : */
1855 : void
1856 52328 : RelationBuildTriggers(Relation relation)
1857 : {
1858 : TriggerDesc *trigdesc;
1859 : int numtrigs;
1860 : int maxtrigs;
1861 : Trigger *triggers;
1862 : Relation tgrel;
1863 : ScanKeyData skey;
1864 : SysScanDesc tgscan;
1865 : HeapTuple htup;
1866 : MemoryContext oldContext;
1867 : int i;
1868 :
1869 : /*
1870 : * Allocate a working array to hold the triggers (the array is extended if
1871 : * necessary)
1872 : */
1873 52328 : maxtrigs = 16;
1874 52328 : triggers = (Trigger *) palloc(maxtrigs * sizeof(Trigger));
1875 52328 : numtrigs = 0;
1876 :
1877 : /*
1878 : * Note: since we scan the triggers using TriggerRelidNameIndexId, we will
1879 : * be reading the triggers in name order, except possibly during
1880 : * emergency-recovery operations (ie, IgnoreSystemIndexes). This in turn
1881 : * ensures that triggers will be fired in name order.
1882 : */
1883 52328 : ScanKeyInit(&skey,
1884 : Anum_pg_trigger_tgrelid,
1885 : BTEqualStrategyNumber, F_OIDEQ,
1886 : ObjectIdGetDatum(RelationGetRelid(relation)));
1887 :
1888 52328 : tgrel = table_open(TriggerRelationId, AccessShareLock);
1889 52328 : tgscan = systable_beginscan(tgrel, TriggerRelidNameIndexId, true,
1890 : NULL, 1, &skey);
1891 :
1892 142338 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
1893 : {
1894 90010 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
1895 : Trigger *build;
1896 : Datum datum;
1897 : bool isnull;
1898 :
1899 90010 : if (numtrigs >= maxtrigs)
1900 : {
1901 48 : maxtrigs *= 2;
1902 48 : triggers = (Trigger *) repalloc(triggers, maxtrigs * sizeof(Trigger));
1903 : }
1904 90010 : build = &(triggers[numtrigs]);
1905 :
1906 90010 : build->tgoid = pg_trigger->oid;
1907 90010 : build->tgname = DatumGetCString(DirectFunctionCall1(nameout,
1908 : NameGetDatum(&pg_trigger->tgname)));
1909 90010 : build->tgfoid = pg_trigger->tgfoid;
1910 90010 : build->tgtype = pg_trigger->tgtype;
1911 90010 : build->tgenabled = pg_trigger->tgenabled;
1912 90010 : build->tgisinternal = pg_trigger->tgisinternal;
1913 90010 : build->tgisclone = OidIsValid(pg_trigger->tgparentid);
1914 90010 : build->tgconstrrelid = pg_trigger->tgconstrrelid;
1915 90010 : build->tgconstrindid = pg_trigger->tgconstrindid;
1916 90010 : build->tgconstraint = pg_trigger->tgconstraint;
1917 90010 : build->tgdeferrable = pg_trigger->tgdeferrable;
1918 90010 : build->tginitdeferred = pg_trigger->tginitdeferred;
1919 90010 : build->tgnargs = pg_trigger->tgnargs;
1920 : /* tgattr is first var-width field, so OK to access directly */
1921 90010 : build->tgnattr = pg_trigger->tgattr.dim1;
1922 90010 : if (build->tgnattr > 0)
1923 : {
1924 500 : build->tgattr = (int16 *) palloc(build->tgnattr * sizeof(int16));
1925 500 : memcpy(build->tgattr, &(pg_trigger->tgattr.values),
1926 500 : build->tgnattr * sizeof(int16));
1927 : }
1928 : else
1929 89510 : build->tgattr = NULL;
1930 90010 : if (build->tgnargs > 0)
1931 : {
1932 : bytea *val;
1933 : char *p;
1934 :
1935 3214 : val = DatumGetByteaPP(fastgetattr(htup,
1936 : Anum_pg_trigger_tgargs,
1937 : tgrel->rd_att, &isnull));
1938 3214 : if (isnull)
1939 0 : elog(ERROR, "tgargs is null in trigger for relation \"%s\"",
1940 : RelationGetRelationName(relation));
1941 3214 : p = (char *) VARDATA_ANY(val);
1942 3214 : build->tgargs = (char **) palloc(build->tgnargs * sizeof(char *));
1943 7138 : for (i = 0; i < build->tgnargs; i++)
1944 : {
1945 3924 : build->tgargs[i] = pstrdup(p);
1946 3924 : p += strlen(p) + 1;
1947 : }
1948 : }
1949 : else
1950 86796 : build->tgargs = NULL;
1951 :
1952 90010 : datum = fastgetattr(htup, Anum_pg_trigger_tgoldtable,
1953 : tgrel->rd_att, &isnull);
1954 90010 : if (!isnull)
1955 734 : build->tgoldtable =
1956 734 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1957 : else
1958 89276 : build->tgoldtable = NULL;
1959 :
1960 90010 : datum = fastgetattr(htup, Anum_pg_trigger_tgnewtable,
1961 : tgrel->rd_att, &isnull);
1962 90010 : if (!isnull)
1963 1036 : build->tgnewtable =
1964 1036 : DatumGetCString(DirectFunctionCall1(nameout, datum));
1965 : else
1966 88974 : build->tgnewtable = NULL;
1967 :
1968 90010 : datum = fastgetattr(htup, Anum_pg_trigger_tgqual,
1969 : tgrel->rd_att, &isnull);
1970 90010 : if (!isnull)
1971 746 : build->tgqual = TextDatumGetCString(datum);
1972 : else
1973 89264 : build->tgqual = NULL;
1974 :
1975 90010 : numtrigs++;
1976 : }
1977 :
1978 52328 : systable_endscan(tgscan);
1979 52328 : table_close(tgrel, AccessShareLock);
1980 :
1981 : /* There might not be any triggers */
1982 52328 : if (numtrigs == 0)
1983 : {
1984 12322 : pfree(triggers);
1985 12322 : return;
1986 : }
1987 :
1988 : /* Build trigdesc */
1989 40006 : trigdesc = (TriggerDesc *) palloc0(sizeof(TriggerDesc));
1990 40006 : trigdesc->triggers = triggers;
1991 40006 : trigdesc->numtriggers = numtrigs;
1992 130016 : for (i = 0; i < numtrigs; i++)
1993 90010 : SetTriggerFlags(trigdesc, &(triggers[i]));
1994 :
1995 : /* Copy completed trigdesc into cache storage */
1996 40006 : oldContext = MemoryContextSwitchTo(CacheMemoryContext);
1997 40006 : relation->trigdesc = CopyTriggerDesc(trigdesc);
1998 40006 : MemoryContextSwitchTo(oldContext);
1999 :
2000 : /* Release working memory */
2001 40006 : FreeTriggerDesc(trigdesc);
2002 : }
2003 :
2004 : /*
2005 : * Update the TriggerDesc's hint flags to include the specified trigger
2006 : */
2007 : static void
2008 90010 : SetTriggerFlags(TriggerDesc *trigdesc, Trigger *trigger)
2009 : {
2010 90010 : int16 tgtype = trigger->tgtype;
2011 :
2012 90010 : trigdesc->trig_insert_before_row |=
2013 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2014 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2015 90010 : trigdesc->trig_insert_after_row |=
2016 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2017 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2018 90010 : trigdesc->trig_insert_instead_row |=
2019 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2020 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_INSERT);
2021 90010 : trigdesc->trig_insert_before_statement |=
2022 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2023 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_INSERT);
2024 90010 : trigdesc->trig_insert_after_statement |=
2025 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2026 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_INSERT);
2027 90010 : trigdesc->trig_update_before_row |=
2028 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2029 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2030 90010 : trigdesc->trig_update_after_row |=
2031 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2032 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2033 90010 : trigdesc->trig_update_instead_row |=
2034 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2035 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_UPDATE);
2036 90010 : trigdesc->trig_update_before_statement |=
2037 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2038 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_UPDATE);
2039 90010 : trigdesc->trig_update_after_statement |=
2040 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2041 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_UPDATE);
2042 90010 : trigdesc->trig_delete_before_row |=
2043 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2044 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2045 90010 : trigdesc->trig_delete_after_row |=
2046 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2047 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2048 90010 : trigdesc->trig_delete_instead_row |=
2049 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_ROW,
2050 : TRIGGER_TYPE_INSTEAD, TRIGGER_TYPE_DELETE);
2051 90010 : trigdesc->trig_delete_before_statement |=
2052 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2053 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_DELETE);
2054 90010 : trigdesc->trig_delete_after_statement |=
2055 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2056 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_DELETE);
2057 : /* there are no row-level truncate triggers */
2058 90010 : trigdesc->trig_truncate_before_statement |=
2059 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2060 : TRIGGER_TYPE_BEFORE, TRIGGER_TYPE_TRUNCATE);
2061 90010 : trigdesc->trig_truncate_after_statement |=
2062 90010 : TRIGGER_TYPE_MATCHES(tgtype, TRIGGER_TYPE_STATEMENT,
2063 : TRIGGER_TYPE_AFTER, TRIGGER_TYPE_TRUNCATE);
2064 :
2065 180020 : trigdesc->trig_insert_new_table |=
2066 121434 : (TRIGGER_FOR_INSERT(tgtype) &&
2067 31424 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2068 180020 : trigdesc->trig_update_old_table |=
2069 130620 : (TRIGGER_FOR_UPDATE(tgtype) &&
2070 40610 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2071 180020 : trigdesc->trig_update_new_table |=
2072 130620 : (TRIGGER_FOR_UPDATE(tgtype) &&
2073 40610 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgnewtable));
2074 180020 : trigdesc->trig_delete_old_table |=
2075 114052 : (TRIGGER_FOR_DELETE(tgtype) &&
2076 24042 : TRIGGER_USES_TRANSITION_TABLE(trigger->tgoldtable));
2077 90010 : }
2078 :
2079 : /*
2080 : * Copy a TriggerDesc data structure.
2081 : *
2082 : * The copy is allocated in the current memory context.
2083 : */
2084 : TriggerDesc *
2085 474940 : CopyTriggerDesc(TriggerDesc *trigdesc)
2086 : {
2087 : TriggerDesc *newdesc;
2088 : Trigger *trigger;
2089 : int i;
2090 :
2091 474940 : if (trigdesc == NULL || trigdesc->numtriggers <= 0)
2092 418936 : return NULL;
2093 :
2094 56004 : newdesc = (TriggerDesc *) palloc(sizeof(TriggerDesc));
2095 56004 : memcpy(newdesc, trigdesc, sizeof(TriggerDesc));
2096 :
2097 56004 : trigger = (Trigger *) palloc(trigdesc->numtriggers * sizeof(Trigger));
2098 56004 : memcpy(trigger, trigdesc->triggers,
2099 56004 : trigdesc->numtriggers * sizeof(Trigger));
2100 56004 : newdesc->triggers = trigger;
2101 :
2102 191324 : for (i = 0; i < trigdesc->numtriggers; i++)
2103 : {
2104 135320 : trigger->tgname = pstrdup(trigger->tgname);
2105 135320 : if (trigger->tgnattr > 0)
2106 : {
2107 : int16 *newattr;
2108 :
2109 980 : newattr = (int16 *) palloc(trigger->tgnattr * sizeof(int16));
2110 980 : memcpy(newattr, trigger->tgattr,
2111 980 : trigger->tgnattr * sizeof(int16));
2112 980 : trigger->tgattr = newattr;
2113 : }
2114 135320 : if (trigger->tgnargs > 0)
2115 : {
2116 : char **newargs;
2117 : int16 j;
2118 :
2119 9784 : newargs = (char **) palloc(trigger->tgnargs * sizeof(char *));
2120 21828 : for (j = 0; j < trigger->tgnargs; j++)
2121 12044 : newargs[j] = pstrdup(trigger->tgargs[j]);
2122 9784 : trigger->tgargs = newargs;
2123 : }
2124 135320 : if (trigger->tgqual)
2125 1220 : trigger->tgqual = pstrdup(trigger->tgqual);
2126 135320 : if (trigger->tgoldtable)
2127 1862 : trigger->tgoldtable = pstrdup(trigger->tgoldtable);
2128 135320 : if (trigger->tgnewtable)
2129 2212 : trigger->tgnewtable = pstrdup(trigger->tgnewtable);
2130 135320 : trigger++;
2131 : }
2132 :
2133 56004 : return newdesc;
2134 : }
2135 :
2136 : /*
2137 : * Free a TriggerDesc data structure.
2138 : */
2139 : void
2140 1011332 : FreeTriggerDesc(TriggerDesc *trigdesc)
2141 : {
2142 : Trigger *trigger;
2143 : int i;
2144 :
2145 1011332 : if (trigdesc == NULL)
2146 935042 : return;
2147 :
2148 76290 : trigger = trigdesc->triggers;
2149 244896 : for (i = 0; i < trigdesc->numtriggers; i++)
2150 : {
2151 168606 : pfree(trigger->tgname);
2152 168606 : if (trigger->tgnattr > 0)
2153 934 : pfree(trigger->tgattr);
2154 168606 : if (trigger->tgnargs > 0)
2155 : {
2156 13522 : while (--(trigger->tgnargs) >= 0)
2157 7444 : pfree(trigger->tgargs[trigger->tgnargs]);
2158 6078 : pfree(trigger->tgargs);
2159 : }
2160 168606 : if (trigger->tgqual)
2161 1384 : pfree(trigger->tgqual);
2162 168606 : if (trigger->tgoldtable)
2163 1388 : pfree(trigger->tgoldtable);
2164 168606 : if (trigger->tgnewtable)
2165 1976 : pfree(trigger->tgnewtable);
2166 168606 : trigger++;
2167 : }
2168 76290 : pfree(trigdesc->triggers);
2169 76290 : pfree(trigdesc);
2170 : }
2171 :
2172 : /*
2173 : * Compare two TriggerDesc structures for logical equality.
2174 : */
2175 : #ifdef NOT_USED
2176 : bool
2177 : equalTriggerDescs(TriggerDesc *trigdesc1, TriggerDesc *trigdesc2)
2178 : {
2179 : int i,
2180 : j;
2181 :
2182 : /*
2183 : * We need not examine the hint flags, just the trigger array itself; if
2184 : * we have the same triggers with the same types, the flags should match.
2185 : *
2186 : * As of 7.3 we assume trigger set ordering is significant in the
2187 : * comparison; so we just compare corresponding slots of the two sets.
2188 : *
2189 : * Note: comparing the stringToNode forms of the WHEN clauses means that
2190 : * parse column locations will affect the result. This is okay as long as
2191 : * this function is only used for detecting exact equality, as for example
2192 : * in checking for staleness of a cache entry.
2193 : */
2194 : if (trigdesc1 != NULL)
2195 : {
2196 : if (trigdesc2 == NULL)
2197 : return false;
2198 : if (trigdesc1->numtriggers != trigdesc2->numtriggers)
2199 : return false;
2200 : for (i = 0; i < trigdesc1->numtriggers; i++)
2201 : {
2202 : Trigger *trig1 = trigdesc1->triggers + i;
2203 : Trigger *trig2 = trigdesc2->triggers + i;
2204 :
2205 : if (trig1->tgoid != trig2->tgoid)
2206 : return false;
2207 : if (strcmp(trig1->tgname, trig2->tgname) != 0)
2208 : return false;
2209 : if (trig1->tgfoid != trig2->tgfoid)
2210 : return false;
2211 : if (trig1->tgtype != trig2->tgtype)
2212 : return false;
2213 : if (trig1->tgenabled != trig2->tgenabled)
2214 : return false;
2215 : if (trig1->tgisinternal != trig2->tgisinternal)
2216 : return false;
2217 : if (trig1->tgisclone != trig2->tgisclone)
2218 : return false;
2219 : if (trig1->tgconstrrelid != trig2->tgconstrrelid)
2220 : return false;
2221 : if (trig1->tgconstrindid != trig2->tgconstrindid)
2222 : return false;
2223 : if (trig1->tgconstraint != trig2->tgconstraint)
2224 : return false;
2225 : if (trig1->tgdeferrable != trig2->tgdeferrable)
2226 : return false;
2227 : if (trig1->tginitdeferred != trig2->tginitdeferred)
2228 : return false;
2229 : if (trig1->tgnargs != trig2->tgnargs)
2230 : return false;
2231 : if (trig1->tgnattr != trig2->tgnattr)
2232 : return false;
2233 : if (trig1->tgnattr > 0 &&
2234 : memcmp(trig1->tgattr, trig2->tgattr,
2235 : trig1->tgnattr * sizeof(int16)) != 0)
2236 : return false;
2237 : for (j = 0; j < trig1->tgnargs; j++)
2238 : if (strcmp(trig1->tgargs[j], trig2->tgargs[j]) != 0)
2239 : return false;
2240 : if (trig1->tgqual == NULL && trig2->tgqual == NULL)
2241 : /* ok */ ;
2242 : else if (trig1->tgqual == NULL || trig2->tgqual == NULL)
2243 : return false;
2244 : else if (strcmp(trig1->tgqual, trig2->tgqual) != 0)
2245 : return false;
2246 : if (trig1->tgoldtable == NULL && trig2->tgoldtable == NULL)
2247 : /* ok */ ;
2248 : else if (trig1->tgoldtable == NULL || trig2->tgoldtable == NULL)
2249 : return false;
2250 : else if (strcmp(trig1->tgoldtable, trig2->tgoldtable) != 0)
2251 : return false;
2252 : if (trig1->tgnewtable == NULL && trig2->tgnewtable == NULL)
2253 : /* ok */ ;
2254 : else if (trig1->tgnewtable == NULL || trig2->tgnewtable == NULL)
2255 : return false;
2256 : else if (strcmp(trig1->tgnewtable, trig2->tgnewtable) != 0)
2257 : return false;
2258 : }
2259 : }
2260 : else if (trigdesc2 != NULL)
2261 : return false;
2262 : return true;
2263 : }
2264 : #endif /* NOT_USED */
2265 :
2266 : /*
2267 : * Check if there is a row-level trigger with transition tables that prevents
2268 : * a table from becoming an inheritance child or partition. Return the name
2269 : * of the first such incompatible trigger, or NULL if there is none.
2270 : */
2271 : const char *
2272 2312 : FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc)
2273 : {
2274 2312 : if (trigdesc != NULL)
2275 : {
2276 : int i;
2277 :
2278 336 : for (i = 0; i < trigdesc->numtriggers; ++i)
2279 : {
2280 246 : Trigger *trigger = &trigdesc->triggers[i];
2281 :
2282 246 : if (trigger->tgoldtable != NULL || trigger->tgnewtable != NULL)
2283 12 : return trigger->tgname;
2284 : }
2285 : }
2286 :
2287 2300 : return NULL;
2288 : }
2289 :
2290 : /*
2291 : * Call a trigger function.
2292 : *
2293 : * trigdata: trigger descriptor.
2294 : * tgindx: trigger's index in finfo and instr arrays.
2295 : * finfo: array of cached trigger function call information.
2296 : * instr: optional array of EXPLAIN ANALYZE instrumentation state.
2297 : * per_tuple_context: memory context to execute the function in.
2298 : *
2299 : * Returns the tuple (or NULL) as returned by the function.
2300 : */
2301 : static HeapTuple
2302 21300 : ExecCallTriggerFunc(TriggerData *trigdata,
2303 : int tgindx,
2304 : FmgrInfo *finfo,
2305 : Instrumentation *instr,
2306 : MemoryContext per_tuple_context)
2307 : {
2308 21300 : LOCAL_FCINFO(fcinfo, 0);
2309 : PgStat_FunctionCallUsage fcusage;
2310 : Datum result;
2311 : MemoryContext oldContext;
2312 :
2313 : /*
2314 : * Protect against code paths that may fail to initialize transition table
2315 : * info.
2316 : */
2317 : Assert(((TRIGGER_FIRED_BY_INSERT(trigdata->tg_event) ||
2318 : TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event) ||
2319 : TRIGGER_FIRED_BY_DELETE(trigdata->tg_event)) &&
2320 : TRIGGER_FIRED_AFTER(trigdata->tg_event) &&
2321 : !(trigdata->tg_event & AFTER_TRIGGER_DEFERRABLE) &&
2322 : !(trigdata->tg_event & AFTER_TRIGGER_INITDEFERRED)) ||
2323 : (trigdata->tg_oldtable == NULL && trigdata->tg_newtable == NULL));
2324 :
2325 21300 : finfo += tgindx;
2326 :
2327 : /*
2328 : * We cache fmgr lookup info, to avoid making the lookup again on each
2329 : * call.
2330 : */
2331 21300 : if (finfo->fn_oid == InvalidOid)
2332 18160 : fmgr_info(trigdata->tg_trigger->tgfoid, finfo);
2333 :
2334 : Assert(finfo->fn_oid == trigdata->tg_trigger->tgfoid);
2335 :
2336 : /*
2337 : * If doing EXPLAIN ANALYZE, start charging time to this trigger.
2338 : */
2339 21300 : if (instr)
2340 0 : InstrStartNode(instr + tgindx);
2341 :
2342 : /*
2343 : * Do the function evaluation in the per-tuple memory context, so that
2344 : * leaked memory will be reclaimed once per tuple. Note in particular that
2345 : * any new tuple created by the trigger function will live till the end of
2346 : * the tuple cycle.
2347 : */
2348 21300 : oldContext = MemoryContextSwitchTo(per_tuple_context);
2349 :
2350 : /*
2351 : * Call the function, passing no arguments but setting a context.
2352 : */
2353 21300 : InitFunctionCallInfoData(*fcinfo, finfo, 0,
2354 : InvalidOid, (Node *) trigdata, NULL);
2355 :
2356 21300 : pgstat_init_function_usage(fcinfo, &fcusage);
2357 :
2358 21300 : MyTriggerDepth++;
2359 21300 : PG_TRY();
2360 : {
2361 21300 : result = FunctionCallInvoke(fcinfo);
2362 : }
2363 1180 : PG_FINALLY();
2364 : {
2365 21300 : MyTriggerDepth--;
2366 : }
2367 21300 : PG_END_TRY();
2368 :
2369 20120 : pgstat_end_function_usage(&fcusage, true);
2370 :
2371 20120 : MemoryContextSwitchTo(oldContext);
2372 :
2373 : /*
2374 : * Trigger protocol allows function to return a null pointer, but NOT to
2375 : * set the isnull result flag.
2376 : */
2377 20120 : if (fcinfo->isnull)
2378 0 : ereport(ERROR,
2379 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2380 : errmsg("trigger function %u returned null value",
2381 : fcinfo->flinfo->fn_oid)));
2382 :
2383 : /*
2384 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
2385 : * one "tuple returned" (really the number of firings).
2386 : */
2387 20120 : if (instr)
2388 0 : InstrStopNode(instr + tgindx, 1);
2389 :
2390 20120 : return (HeapTuple) DatumGetPointer(result);
2391 : }
2392 :
2393 : void
2394 92672 : ExecBSInsertTriggers(EState *estate, ResultRelInfo *relinfo)
2395 : {
2396 : TriggerDesc *trigdesc;
2397 : int i;
2398 92672 : TriggerData LocTriggerData = {0};
2399 :
2400 92672 : trigdesc = relinfo->ri_TrigDesc;
2401 :
2402 92672 : if (trigdesc == NULL)
2403 92460 : return;
2404 6888 : if (!trigdesc->trig_insert_before_statement)
2405 6676 : return;
2406 :
2407 : /* no-op if we already fired BS triggers in this context */
2408 212 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2409 : CMD_INSERT))
2410 0 : return;
2411 :
2412 212 : LocTriggerData.type = T_TriggerData;
2413 212 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2414 : TRIGGER_EVENT_BEFORE;
2415 212 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2416 1832 : for (i = 0; i < trigdesc->numtriggers; i++)
2417 : {
2418 1632 : Trigger *trigger = &trigdesc->triggers[i];
2419 : HeapTuple newtuple;
2420 :
2421 1632 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2422 : TRIGGER_TYPE_STATEMENT,
2423 : TRIGGER_TYPE_BEFORE,
2424 : TRIGGER_TYPE_INSERT))
2425 1408 : continue;
2426 224 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2427 : NULL, NULL, NULL))
2428 30 : continue;
2429 :
2430 194 : LocTriggerData.tg_trigger = trigger;
2431 194 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2432 : i,
2433 : relinfo->ri_TrigFunctions,
2434 : relinfo->ri_TrigInstrument,
2435 194 : GetPerTupleMemoryContext(estate));
2436 :
2437 182 : if (newtuple)
2438 0 : ereport(ERROR,
2439 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2440 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2441 : }
2442 : }
2443 :
2444 : void
2445 90288 : ExecASInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2446 : TransitionCaptureState *transition_capture)
2447 : {
2448 90288 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2449 :
2450 90288 : if (trigdesc && trigdesc->trig_insert_after_statement)
2451 448 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2452 : TRIGGER_EVENT_INSERT,
2453 : false, NULL, NULL, NIL, NULL, transition_capture,
2454 : false);
2455 90288 : }
2456 :
2457 : bool
2458 2400 : ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2459 : TupleTableSlot *slot)
2460 : {
2461 2400 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2462 2400 : HeapTuple newtuple = NULL;
2463 : bool should_free;
2464 2400 : TriggerData LocTriggerData = {0};
2465 : int i;
2466 :
2467 2400 : LocTriggerData.type = T_TriggerData;
2468 2400 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2469 : TRIGGER_EVENT_ROW |
2470 : TRIGGER_EVENT_BEFORE;
2471 2400 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2472 11006 : for (i = 0; i < trigdesc->numtriggers; i++)
2473 : {
2474 8940 : Trigger *trigger = &trigdesc->triggers[i];
2475 : HeapTuple oldtuple;
2476 :
2477 8940 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2478 : TRIGGER_TYPE_ROW,
2479 : TRIGGER_TYPE_BEFORE,
2480 : TRIGGER_TYPE_INSERT))
2481 4244 : continue;
2482 4696 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2483 : NULL, NULL, slot))
2484 50 : continue;
2485 :
2486 4646 : if (!newtuple)
2487 2366 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2488 :
2489 4646 : LocTriggerData.tg_trigslot = slot;
2490 4646 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2491 4646 : LocTriggerData.tg_trigger = trigger;
2492 4646 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2493 : i,
2494 : relinfo->ri_TrigFunctions,
2495 : relinfo->ri_TrigInstrument,
2496 4646 : GetPerTupleMemoryContext(estate));
2497 4554 : if (newtuple == NULL)
2498 : {
2499 218 : if (should_free)
2500 20 : heap_freetuple(oldtuple);
2501 218 : return false; /* "do nothing" */
2502 : }
2503 4336 : else if (newtuple != oldtuple)
2504 : {
2505 746 : ExecForceStoreHeapTuple(newtuple, slot, false);
2506 :
2507 : /*
2508 : * After a tuple in a partition goes through a trigger, the user
2509 : * could have changed the partition key enough that the tuple no
2510 : * longer fits the partition. Verify that.
2511 : */
2512 746 : if (trigger->tgisclone &&
2513 66 : !ExecPartitionCheck(relinfo, slot, estate, false))
2514 24 : ereport(ERROR,
2515 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2516 : errmsg("moving row to another partition during a BEFORE FOR EACH ROW trigger is not supported"),
2517 : errdetail("Before executing trigger \"%s\", the row was to be in partition \"%s.%s\".",
2518 : trigger->tgname,
2519 : get_namespace_name(RelationGetNamespace(relinfo->ri_RelationDesc)),
2520 : RelationGetRelationName(relinfo->ri_RelationDesc))));
2521 :
2522 722 : if (should_free)
2523 40 : heap_freetuple(oldtuple);
2524 :
2525 : /* signal tuple should be re-fetched if used */
2526 722 : newtuple = NULL;
2527 : }
2528 : }
2529 :
2530 2066 : return true;
2531 : }
2532 :
2533 : void
2534 11618642 : ExecARInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2535 : TupleTableSlot *slot, List *recheckIndexes,
2536 : TransitionCaptureState *transition_capture)
2537 : {
2538 11618642 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2539 :
2540 11618642 : if ((trigdesc && trigdesc->trig_insert_after_row) ||
2541 60300 : (transition_capture && transition_capture->tcs_insert_new_table))
2542 65348 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2543 : TRIGGER_EVENT_INSERT,
2544 : true, NULL, slot,
2545 : recheckIndexes, NULL,
2546 : transition_capture,
2547 : false);
2548 11618642 : }
2549 :
2550 : bool
2551 180 : ExecIRInsertTriggers(EState *estate, ResultRelInfo *relinfo,
2552 : TupleTableSlot *slot)
2553 : {
2554 180 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2555 180 : HeapTuple newtuple = NULL;
2556 : bool should_free;
2557 180 : TriggerData LocTriggerData = {0};
2558 : int i;
2559 :
2560 180 : LocTriggerData.type = T_TriggerData;
2561 180 : LocTriggerData.tg_event = TRIGGER_EVENT_INSERT |
2562 : TRIGGER_EVENT_ROW |
2563 : TRIGGER_EVENT_INSTEAD;
2564 180 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2565 546 : for (i = 0; i < trigdesc->numtriggers; i++)
2566 : {
2567 384 : Trigger *trigger = &trigdesc->triggers[i];
2568 : HeapTuple oldtuple;
2569 :
2570 384 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2571 : TRIGGER_TYPE_ROW,
2572 : TRIGGER_TYPE_INSTEAD,
2573 : TRIGGER_TYPE_INSERT))
2574 204 : continue;
2575 180 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2576 : NULL, NULL, slot))
2577 0 : continue;
2578 :
2579 180 : if (!newtuple)
2580 180 : newtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2581 :
2582 180 : LocTriggerData.tg_trigslot = slot;
2583 180 : LocTriggerData.tg_trigtuple = oldtuple = newtuple;
2584 180 : LocTriggerData.tg_trigger = trigger;
2585 180 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2586 : i,
2587 : relinfo->ri_TrigFunctions,
2588 : relinfo->ri_TrigInstrument,
2589 180 : GetPerTupleMemoryContext(estate));
2590 180 : if (newtuple == NULL)
2591 : {
2592 18 : if (should_free)
2593 18 : heap_freetuple(oldtuple);
2594 18 : return false; /* "do nothing" */
2595 : }
2596 162 : else if (newtuple != oldtuple)
2597 : {
2598 36 : ExecForceStoreHeapTuple(newtuple, slot, false);
2599 :
2600 36 : if (should_free)
2601 36 : heap_freetuple(oldtuple);
2602 :
2603 : /* signal tuple should be re-fetched if used */
2604 36 : newtuple = NULL;
2605 : }
2606 : }
2607 :
2608 162 : return true;
2609 : }
2610 :
2611 : void
2612 12176 : ExecBSDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
2613 : {
2614 : TriggerDesc *trigdesc;
2615 : int i;
2616 12176 : TriggerData LocTriggerData = {0};
2617 :
2618 12176 : trigdesc = relinfo->ri_TrigDesc;
2619 :
2620 12176 : if (trigdesc == NULL)
2621 12098 : return;
2622 1428 : if (!trigdesc->trig_delete_before_statement)
2623 1308 : return;
2624 :
2625 : /* no-op if we already fired BS triggers in this context */
2626 120 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2627 : CMD_DELETE))
2628 42 : return;
2629 :
2630 78 : LocTriggerData.type = T_TriggerData;
2631 78 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2632 : TRIGGER_EVENT_BEFORE;
2633 78 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2634 708 : for (i = 0; i < trigdesc->numtriggers; i++)
2635 : {
2636 630 : Trigger *trigger = &trigdesc->triggers[i];
2637 : HeapTuple newtuple;
2638 :
2639 630 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2640 : TRIGGER_TYPE_STATEMENT,
2641 : TRIGGER_TYPE_BEFORE,
2642 : TRIGGER_TYPE_DELETE))
2643 552 : continue;
2644 78 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2645 : NULL, NULL, NULL))
2646 12 : continue;
2647 :
2648 66 : LocTriggerData.tg_trigger = trigger;
2649 66 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2650 : i,
2651 : relinfo->ri_TrigFunctions,
2652 : relinfo->ri_TrigInstrument,
2653 66 : GetPerTupleMemoryContext(estate));
2654 :
2655 66 : if (newtuple)
2656 0 : ereport(ERROR,
2657 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2658 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2659 : }
2660 : }
2661 :
2662 : void
2663 12016 : ExecASDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2664 : TransitionCaptureState *transition_capture)
2665 : {
2666 12016 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2667 :
2668 12016 : if (trigdesc && trigdesc->trig_delete_after_statement)
2669 230 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2670 : TRIGGER_EVENT_DELETE,
2671 : false, NULL, NULL, NIL, NULL, transition_capture,
2672 : false);
2673 12016 : }
2674 :
2675 : /*
2676 : * Execute BEFORE ROW DELETE triggers.
2677 : *
2678 : * True indicates caller can proceed with the delete. False indicates caller
2679 : * need to suppress the delete and additionally if requested, we need to pass
2680 : * back the concurrently updated tuple if any.
2681 : */
2682 : bool
2683 388 : ExecBRDeleteTriggers(EState *estate, EPQState *epqstate,
2684 : ResultRelInfo *relinfo,
2685 : ItemPointer tupleid,
2686 : HeapTuple fdw_trigtuple,
2687 : TupleTableSlot **epqslot,
2688 : TM_Result *tmresult,
2689 : TM_FailureData *tmfd)
2690 : {
2691 388 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2692 388 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2693 388 : bool result = true;
2694 388 : TriggerData LocTriggerData = {0};
2695 : HeapTuple trigtuple;
2696 388 : bool should_free = false;
2697 : int i;
2698 :
2699 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2700 388 : if (fdw_trigtuple == NULL)
2701 : {
2702 372 : TupleTableSlot *epqslot_candidate = NULL;
2703 :
2704 372 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
2705 : LockTupleExclusive, slot, &epqslot_candidate,
2706 : tmresult, tmfd))
2707 12 : return false;
2708 :
2709 : /*
2710 : * If the tuple was concurrently updated and the caller of this
2711 : * function requested for the updated tuple, skip the trigger
2712 : * execution.
2713 : */
2714 356 : if (epqslot_candidate != NULL && epqslot != NULL)
2715 : {
2716 2 : *epqslot = epqslot_candidate;
2717 2 : return false;
2718 : }
2719 :
2720 354 : trigtuple = ExecFetchSlotHeapTuple(slot, true, &should_free);
2721 : }
2722 : else
2723 : {
2724 16 : trigtuple = fdw_trigtuple;
2725 16 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2726 : }
2727 :
2728 370 : LocTriggerData.type = T_TriggerData;
2729 370 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2730 : TRIGGER_EVENT_ROW |
2731 : TRIGGER_EVENT_BEFORE;
2732 370 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2733 1300 : for (i = 0; i < trigdesc->numtriggers; i++)
2734 : {
2735 : HeapTuple newtuple;
2736 1010 : Trigger *trigger = &trigdesc->triggers[i];
2737 :
2738 1010 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2739 : TRIGGER_TYPE_ROW,
2740 : TRIGGER_TYPE_BEFORE,
2741 : TRIGGER_TYPE_DELETE))
2742 634 : continue;
2743 376 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2744 : NULL, slot, NULL))
2745 14 : continue;
2746 :
2747 362 : LocTriggerData.tg_trigslot = slot;
2748 362 : LocTriggerData.tg_trigtuple = trigtuple;
2749 362 : LocTriggerData.tg_trigger = trigger;
2750 362 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2751 : i,
2752 : relinfo->ri_TrigFunctions,
2753 : relinfo->ri_TrigInstrument,
2754 362 : GetPerTupleMemoryContext(estate));
2755 334 : if (newtuple == NULL)
2756 : {
2757 52 : result = false; /* tell caller to suppress delete */
2758 52 : break;
2759 : }
2760 282 : if (newtuple != trigtuple)
2761 56 : heap_freetuple(newtuple);
2762 : }
2763 342 : if (should_free)
2764 0 : heap_freetuple(trigtuple);
2765 :
2766 342 : return result;
2767 : }
2768 :
2769 : /*
2770 : * Note: is_crosspart_update must be true if the DELETE is being performed
2771 : * as part of a cross-partition update.
2772 : */
2773 : void
2774 1606282 : ExecARDeleteTriggers(EState *estate,
2775 : ResultRelInfo *relinfo,
2776 : ItemPointer tupleid,
2777 : HeapTuple fdw_trigtuple,
2778 : TransitionCaptureState *transition_capture,
2779 : bool is_crosspart_update)
2780 : {
2781 1606282 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2782 :
2783 1606282 : if ((trigdesc && trigdesc->trig_delete_after_row) ||
2784 4998 : (transition_capture && transition_capture->tcs_delete_old_table))
2785 : {
2786 6020 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2787 :
2788 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2789 6020 : if (fdw_trigtuple == NULL)
2790 6004 : GetTupleForTrigger(estate,
2791 : NULL,
2792 : relinfo,
2793 : tupleid,
2794 : LockTupleExclusive,
2795 : slot,
2796 : NULL,
2797 : NULL,
2798 : NULL);
2799 : else
2800 16 : ExecForceStoreHeapTuple(fdw_trigtuple, slot, false);
2801 :
2802 6020 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2803 : TRIGGER_EVENT_DELETE,
2804 : true, slot, NULL, NIL, NULL,
2805 : transition_capture,
2806 : is_crosspart_update);
2807 : }
2808 1606282 : }
2809 :
2810 : bool
2811 60 : ExecIRDeleteTriggers(EState *estate, ResultRelInfo *relinfo,
2812 : HeapTuple trigtuple)
2813 : {
2814 60 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2815 60 : TupleTableSlot *slot = ExecGetTriggerOldSlot(estate, relinfo);
2816 60 : TriggerData LocTriggerData = {0};
2817 : int i;
2818 :
2819 60 : LocTriggerData.type = T_TriggerData;
2820 60 : LocTriggerData.tg_event = TRIGGER_EVENT_DELETE |
2821 : TRIGGER_EVENT_ROW |
2822 : TRIGGER_EVENT_INSTEAD;
2823 60 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2824 :
2825 60 : ExecForceStoreHeapTuple(trigtuple, slot, false);
2826 :
2827 354 : for (i = 0; i < trigdesc->numtriggers; i++)
2828 : {
2829 : HeapTuple rettuple;
2830 300 : Trigger *trigger = &trigdesc->triggers[i];
2831 :
2832 300 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2833 : TRIGGER_TYPE_ROW,
2834 : TRIGGER_TYPE_INSTEAD,
2835 : TRIGGER_TYPE_DELETE))
2836 240 : continue;
2837 60 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2838 : NULL, slot, NULL))
2839 0 : continue;
2840 :
2841 60 : LocTriggerData.tg_trigslot = slot;
2842 60 : LocTriggerData.tg_trigtuple = trigtuple;
2843 60 : LocTriggerData.tg_trigger = trigger;
2844 60 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
2845 : i,
2846 : relinfo->ri_TrigFunctions,
2847 : relinfo->ri_TrigInstrument,
2848 60 : GetPerTupleMemoryContext(estate));
2849 60 : if (rettuple == NULL)
2850 6 : return false; /* Delete was suppressed */
2851 54 : if (rettuple != trigtuple)
2852 0 : heap_freetuple(rettuple);
2853 : }
2854 54 : return true;
2855 : }
2856 :
2857 : void
2858 14436 : ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
2859 : {
2860 : TriggerDesc *trigdesc;
2861 : int i;
2862 14436 : TriggerData LocTriggerData = {0};
2863 : Bitmapset *updatedCols;
2864 :
2865 14436 : trigdesc = relinfo->ri_TrigDesc;
2866 :
2867 14436 : if (trigdesc == NULL)
2868 14258 : return;
2869 3836 : if (!trigdesc->trig_update_before_statement)
2870 3658 : return;
2871 :
2872 : /* no-op if we already fired BS triggers in this context */
2873 178 : if (before_stmt_triggers_fired(RelationGetRelid(relinfo->ri_RelationDesc),
2874 : CMD_UPDATE))
2875 0 : return;
2876 :
2877 : /* statement-level triggers operate on the parent table */
2878 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2879 :
2880 178 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
2881 :
2882 178 : LocTriggerData.type = T_TriggerData;
2883 178 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
2884 : TRIGGER_EVENT_BEFORE;
2885 178 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
2886 178 : LocTriggerData.tg_updatedcols = updatedCols;
2887 1600 : for (i = 0; i < trigdesc->numtriggers; i++)
2888 : {
2889 1422 : Trigger *trigger = &trigdesc->triggers[i];
2890 : HeapTuple newtuple;
2891 :
2892 1422 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
2893 : TRIGGER_TYPE_STATEMENT,
2894 : TRIGGER_TYPE_BEFORE,
2895 : TRIGGER_TYPE_UPDATE))
2896 1244 : continue;
2897 178 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
2898 : updatedCols, NULL, NULL))
2899 6 : continue;
2900 :
2901 172 : LocTriggerData.tg_trigger = trigger;
2902 172 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
2903 : i,
2904 : relinfo->ri_TrigFunctions,
2905 : relinfo->ri_TrigInstrument,
2906 172 : GetPerTupleMemoryContext(estate));
2907 :
2908 172 : if (newtuple)
2909 0 : ereport(ERROR,
2910 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2911 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
2912 : }
2913 : }
2914 :
2915 : void
2916 13646 : ExecASUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
2917 : TransitionCaptureState *transition_capture)
2918 : {
2919 13646 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2920 :
2921 : /* statement-level triggers operate on the parent table */
2922 : Assert(relinfo->ri_RootResultRelInfo == NULL);
2923 :
2924 13646 : if (trigdesc && trigdesc->trig_update_after_statement)
2925 396 : AfterTriggerSaveEvent(estate, relinfo, NULL, NULL,
2926 : TRIGGER_EVENT_UPDATE,
2927 : false, NULL, NULL, NIL,
2928 : ExecGetAllUpdatedCols(relinfo, estate),
2929 : transition_capture,
2930 : false);
2931 13646 : }
2932 :
2933 : bool
2934 2578 : ExecBRUpdateTriggers(EState *estate, EPQState *epqstate,
2935 : ResultRelInfo *relinfo,
2936 : ItemPointer tupleid,
2937 : HeapTuple fdw_trigtuple,
2938 : TupleTableSlot *newslot,
2939 : TM_Result *tmresult,
2940 : TM_FailureData *tmfd)
2941 : {
2942 2578 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
2943 2578 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
2944 2578 : HeapTuple newtuple = NULL;
2945 : HeapTuple trigtuple;
2946 2578 : bool should_free_trig = false;
2947 2578 : bool should_free_new = false;
2948 2578 : TriggerData LocTriggerData = {0};
2949 : int i;
2950 : Bitmapset *updatedCols;
2951 : LockTupleMode lockmode;
2952 :
2953 : /* Determine lock mode to use */
2954 2578 : lockmode = ExecUpdateLockMode(estate, relinfo);
2955 :
2956 : Assert(HeapTupleIsValid(fdw_trigtuple) ^ ItemPointerIsValid(tupleid));
2957 2578 : if (fdw_trigtuple == NULL)
2958 : {
2959 2540 : TupleTableSlot *epqslot_candidate = NULL;
2960 :
2961 : /* get a copy of the on-disk tuple we are planning to update */
2962 2540 : if (!GetTupleForTrigger(estate, epqstate, relinfo, tupleid,
2963 : lockmode, oldslot, &epqslot_candidate,
2964 : tmresult, tmfd))
2965 22 : return false; /* cancel the update action */
2966 :
2967 : /*
2968 : * In READ COMMITTED isolation level it's possible that target tuple
2969 : * was changed due to concurrent update. In that case we have a raw
2970 : * subplan output tuple in epqslot_candidate, and need to form a new
2971 : * insertable tuple using ExecGetUpdateNewTuple to replace the one we
2972 : * received in newslot. Neither we nor our callers have any further
2973 : * interest in the passed-in tuple, so it's okay to overwrite newslot
2974 : * with the newer data.
2975 : */
2976 2510 : if (epqslot_candidate != NULL)
2977 : {
2978 : TupleTableSlot *epqslot_clean;
2979 :
2980 6 : epqslot_clean = ExecGetUpdateNewTuple(relinfo, epqslot_candidate,
2981 : oldslot);
2982 :
2983 : /*
2984 : * Typically, the caller's newslot was also generated by
2985 : * ExecGetUpdateNewTuple, so that epqslot_clean will be the same
2986 : * slot and copying is not needed. But do the right thing if it
2987 : * isn't.
2988 : */
2989 6 : if (unlikely(newslot != epqslot_clean))
2990 0 : ExecCopySlot(newslot, epqslot_clean);
2991 :
2992 : /*
2993 : * At this point newslot contains a virtual tuple that may
2994 : * reference some fields of oldslot's tuple in some disk buffer.
2995 : * If that tuple is in a different page than the original target
2996 : * tuple, then our only pin on that buffer is oldslot's, and we're
2997 : * about to release it. Hence we'd better materialize newslot to
2998 : * ensure it doesn't contain references into an unpinned buffer.
2999 : * (We'd materialize it below anyway, but too late for safety.)
3000 : */
3001 6 : ExecMaterializeSlot(newslot);
3002 : }
3003 :
3004 : /*
3005 : * Here we convert oldslot to a materialized slot holding trigtuple.
3006 : * Neither slot passed to the triggers will hold any buffer pin.
3007 : */
3008 2510 : trigtuple = ExecFetchSlotHeapTuple(oldslot, true, &should_free_trig);
3009 : }
3010 : else
3011 : {
3012 : /* Put the FDW-supplied tuple into oldslot to unify the cases */
3013 38 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3014 38 : trigtuple = fdw_trigtuple;
3015 : }
3016 :
3017 2548 : LocTriggerData.type = T_TriggerData;
3018 2548 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3019 : TRIGGER_EVENT_ROW |
3020 : TRIGGER_EVENT_BEFORE;
3021 2548 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3022 2548 : updatedCols = ExecGetAllUpdatedCols(relinfo, estate);
3023 2548 : LocTriggerData.tg_updatedcols = updatedCols;
3024 11410 : for (i = 0; i < trigdesc->numtriggers; i++)
3025 : {
3026 9028 : Trigger *trigger = &trigdesc->triggers[i];
3027 : HeapTuple oldtuple;
3028 :
3029 9028 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3030 : TRIGGER_TYPE_ROW,
3031 : TRIGGER_TYPE_BEFORE,
3032 : TRIGGER_TYPE_UPDATE))
3033 4396 : continue;
3034 4632 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3035 : updatedCols, oldslot, newslot))
3036 86 : continue;
3037 :
3038 4546 : if (!newtuple)
3039 2554 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free_new);
3040 :
3041 4546 : LocTriggerData.tg_trigslot = oldslot;
3042 4546 : LocTriggerData.tg_trigtuple = trigtuple;
3043 4546 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3044 4546 : LocTriggerData.tg_newslot = newslot;
3045 4546 : LocTriggerData.tg_trigger = trigger;
3046 4546 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3047 : i,
3048 : relinfo->ri_TrigFunctions,
3049 : relinfo->ri_TrigInstrument,
3050 4546 : GetPerTupleMemoryContext(estate));
3051 :
3052 4518 : if (newtuple == NULL)
3053 : {
3054 138 : if (should_free_trig)
3055 0 : heap_freetuple(trigtuple);
3056 138 : if (should_free_new)
3057 4 : heap_freetuple(oldtuple);
3058 138 : return false; /* "do nothing" */
3059 : }
3060 4380 : else if (newtuple != oldtuple)
3061 : {
3062 1298 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3063 :
3064 : /*
3065 : * If the tuple returned by the trigger / being stored, is the old
3066 : * row version, and the heap tuple passed to the trigger was
3067 : * allocated locally, materialize the slot. Otherwise we might
3068 : * free it while still referenced by the slot.
3069 : */
3070 1298 : if (should_free_trig && newtuple == trigtuple)
3071 0 : ExecMaterializeSlot(newslot);
3072 :
3073 1298 : if (should_free_new)
3074 2 : heap_freetuple(oldtuple);
3075 :
3076 : /* signal tuple should be re-fetched if used */
3077 1298 : newtuple = NULL;
3078 : }
3079 : }
3080 2382 : if (should_free_trig)
3081 0 : heap_freetuple(trigtuple);
3082 :
3083 2382 : return true;
3084 : }
3085 :
3086 : /*
3087 : * Note: 'src_partinfo' and 'dst_partinfo', when non-NULL, refer to the source
3088 : * and destination partitions, respectively, of a cross-partition update of
3089 : * the root partitioned table mentioned in the query, given by 'relinfo'.
3090 : * 'tupleid' in that case refers to the ctid of the "old" tuple in the source
3091 : * partition, and 'newslot' contains the "new" tuple in the destination
3092 : * partition. This interface allows to support the requirements of
3093 : * ExecCrossPartitionUpdateForeignKey(); is_crosspart_update must be true in
3094 : * that case.
3095 : */
3096 : void
3097 376538 : ExecARUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3098 : ResultRelInfo *src_partinfo,
3099 : ResultRelInfo *dst_partinfo,
3100 : ItemPointer tupleid,
3101 : HeapTuple fdw_trigtuple,
3102 : TupleTableSlot *newslot,
3103 : List *recheckIndexes,
3104 : TransitionCaptureState *transition_capture,
3105 : bool is_crosspart_update)
3106 : {
3107 376538 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3108 :
3109 376538 : if ((trigdesc && trigdesc->trig_update_after_row) ||
3110 360 : (transition_capture &&
3111 360 : (transition_capture->tcs_update_old_table ||
3112 12 : transition_capture->tcs_update_new_table)))
3113 : {
3114 : /*
3115 : * Note: if the UPDATE is converted into a DELETE+INSERT as part of
3116 : * update-partition-key operation, then this function is also called
3117 : * separately for DELETE and INSERT to capture transition table rows.
3118 : * In such case, either old tuple or new tuple can be NULL.
3119 : */
3120 : TupleTableSlot *oldslot;
3121 : ResultRelInfo *tupsrc;
3122 :
3123 : Assert((src_partinfo != NULL && dst_partinfo != NULL) ||
3124 : !is_crosspart_update);
3125 :
3126 3360 : tupsrc = src_partinfo ? src_partinfo : relinfo;
3127 3360 : oldslot = ExecGetTriggerOldSlot(estate, tupsrc);
3128 :
3129 3360 : if (fdw_trigtuple == NULL && ItemPointerIsValid(tupleid))
3130 3298 : GetTupleForTrigger(estate,
3131 : NULL,
3132 : tupsrc,
3133 : tupleid,
3134 : LockTupleExclusive,
3135 : oldslot,
3136 : NULL,
3137 : NULL,
3138 : NULL);
3139 62 : else if (fdw_trigtuple != NULL)
3140 20 : ExecForceStoreHeapTuple(fdw_trigtuple, oldslot, false);
3141 : else
3142 42 : ExecClearTuple(oldslot);
3143 :
3144 3360 : AfterTriggerSaveEvent(estate, relinfo,
3145 : src_partinfo, dst_partinfo,
3146 : TRIGGER_EVENT_UPDATE,
3147 : true,
3148 : oldslot, newslot, recheckIndexes,
3149 : ExecGetAllUpdatedCols(relinfo, estate),
3150 : transition_capture,
3151 : is_crosspart_update);
3152 : }
3153 376538 : }
3154 :
3155 : bool
3156 192 : ExecIRUpdateTriggers(EState *estate, ResultRelInfo *relinfo,
3157 : HeapTuple trigtuple, TupleTableSlot *newslot)
3158 : {
3159 192 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3160 192 : TupleTableSlot *oldslot = ExecGetTriggerOldSlot(estate, relinfo);
3161 192 : HeapTuple newtuple = NULL;
3162 : bool should_free;
3163 192 : TriggerData LocTriggerData = {0};
3164 : int i;
3165 :
3166 192 : LocTriggerData.type = T_TriggerData;
3167 192 : LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
3168 : TRIGGER_EVENT_ROW |
3169 : TRIGGER_EVENT_INSTEAD;
3170 192 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3171 :
3172 192 : ExecForceStoreHeapTuple(trigtuple, oldslot, false);
3173 :
3174 738 : for (i = 0; i < trigdesc->numtriggers; i++)
3175 : {
3176 570 : Trigger *trigger = &trigdesc->triggers[i];
3177 : HeapTuple oldtuple;
3178 :
3179 570 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3180 : TRIGGER_TYPE_ROW,
3181 : TRIGGER_TYPE_INSTEAD,
3182 : TRIGGER_TYPE_UPDATE))
3183 378 : continue;
3184 192 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3185 : NULL, oldslot, newslot))
3186 0 : continue;
3187 :
3188 192 : if (!newtuple)
3189 192 : newtuple = ExecFetchSlotHeapTuple(newslot, true, &should_free);
3190 :
3191 192 : LocTriggerData.tg_trigslot = oldslot;
3192 192 : LocTriggerData.tg_trigtuple = trigtuple;
3193 192 : LocTriggerData.tg_newslot = newslot;
3194 192 : LocTriggerData.tg_newtuple = oldtuple = newtuple;
3195 :
3196 192 : LocTriggerData.tg_trigger = trigger;
3197 192 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3198 : i,
3199 : relinfo->ri_TrigFunctions,
3200 : relinfo->ri_TrigInstrument,
3201 192 : GetPerTupleMemoryContext(estate));
3202 186 : if (newtuple == NULL)
3203 : {
3204 18 : return false; /* "do nothing" */
3205 : }
3206 168 : else if (newtuple != oldtuple)
3207 : {
3208 54 : ExecForceStoreHeapTuple(newtuple, newslot, false);
3209 :
3210 54 : if (should_free)
3211 54 : heap_freetuple(oldtuple);
3212 :
3213 : /* signal tuple should be re-fetched if used */
3214 54 : newtuple = NULL;
3215 : }
3216 : }
3217 :
3218 168 : return true;
3219 : }
3220 :
3221 : void
3222 3168 : ExecBSTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3223 : {
3224 : TriggerDesc *trigdesc;
3225 : int i;
3226 3168 : TriggerData LocTriggerData = {0};
3227 :
3228 3168 : trigdesc = relinfo->ri_TrigDesc;
3229 :
3230 3168 : if (trigdesc == NULL)
3231 3156 : return;
3232 518 : if (!trigdesc->trig_truncate_before_statement)
3233 506 : return;
3234 :
3235 12 : LocTriggerData.type = T_TriggerData;
3236 12 : LocTriggerData.tg_event = TRIGGER_EVENT_TRUNCATE |
3237 : TRIGGER_EVENT_BEFORE;
3238 12 : LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
3239 :
3240 36 : for (i = 0; i < trigdesc->numtriggers; i++)
3241 : {
3242 24 : Trigger *trigger = &trigdesc->triggers[i];
3243 : HeapTuple newtuple;
3244 :
3245 24 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
3246 : TRIGGER_TYPE_STATEMENT,
3247 : TRIGGER_TYPE_BEFORE,
3248 : TRIGGER_TYPE_TRUNCATE))
3249 12 : continue;
3250 12 : if (!TriggerEnabled(estate, relinfo, trigger, LocTriggerData.tg_event,
3251 : NULL, NULL, NULL))
3252 0 : continue;
3253 :
3254 12 : LocTriggerData.tg_trigger = trigger;
3255 12 : newtuple = ExecCallTriggerFunc(&LocTriggerData,
3256 : i,
3257 : relinfo->ri_TrigFunctions,
3258 : relinfo->ri_TrigInstrument,
3259 12 : GetPerTupleMemoryContext(estate));
3260 :
3261 12 : if (newtuple)
3262 0 : ereport(ERROR,
3263 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
3264 : errmsg("BEFORE STATEMENT trigger cannot return a value")));
3265 : }
3266 : }
3267 :
3268 : void
3269 3160 : ExecASTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
3270 : {
3271 3160 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
3272 :
3273 3160 : if (trigdesc && trigdesc->trig_truncate_after_statement)
3274 8 : AfterTriggerSaveEvent(estate, relinfo,
3275 : NULL, NULL,
3276 : TRIGGER_EVENT_TRUNCATE,
3277 : false, NULL, NULL, NIL, NULL, NULL,
3278 : false);
3279 3160 : }
3280 :
3281 :
3282 : /*
3283 : * Fetch tuple into "oldslot", dealing with locking and EPQ if necessary
3284 : */
3285 : static bool
3286 12214 : GetTupleForTrigger(EState *estate,
3287 : EPQState *epqstate,
3288 : ResultRelInfo *relinfo,
3289 : ItemPointer tid,
3290 : LockTupleMode lockmode,
3291 : TupleTableSlot *oldslot,
3292 : TupleTableSlot **epqslot,
3293 : TM_Result *tmresultp,
3294 : TM_FailureData *tmfdp)
3295 : {
3296 12214 : Relation relation = relinfo->ri_RelationDesc;
3297 :
3298 12214 : if (epqslot != NULL)
3299 : {
3300 : TM_Result test;
3301 : TM_FailureData tmfd;
3302 2912 : int lockflags = 0;
3303 :
3304 2912 : *epqslot = NULL;
3305 :
3306 : /* caller must pass an epqstate if EvalPlanQual is possible */
3307 : Assert(epqstate != NULL);
3308 :
3309 : /*
3310 : * lock tuple for update
3311 : */
3312 2912 : if (!IsolationUsesXactSnapshot())
3313 2048 : lockflags |= TUPLE_LOCK_FLAG_FIND_LAST_VERSION;
3314 2912 : test = table_tuple_lock(relation, tid, estate->es_snapshot, oldslot,
3315 : estate->es_output_cid,
3316 : lockmode, LockWaitBlock,
3317 : lockflags,
3318 : &tmfd);
3319 :
3320 : /* Let the caller know about the status of this operation */
3321 2908 : if (tmresultp)
3322 216 : *tmresultp = test;
3323 2908 : if (tmfdp)
3324 2902 : *tmfdp = tmfd;
3325 :
3326 2908 : switch (test)
3327 : {
3328 6 : case TM_SelfModified:
3329 :
3330 : /*
3331 : * The target tuple was already updated or deleted by the
3332 : * current command, or by a later command in the current
3333 : * transaction. We ignore the tuple in the former case, and
3334 : * throw error in the latter case, for the same reasons
3335 : * enumerated in ExecUpdate and ExecDelete in
3336 : * nodeModifyTable.c.
3337 : */
3338 6 : if (tmfd.cmax != estate->es_output_cid)
3339 6 : ereport(ERROR,
3340 : (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
3341 : errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
3342 : errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
3343 :
3344 : /* treat it as deleted; do not process */
3345 32 : return false;
3346 :
3347 2884 : case TM_Ok:
3348 2884 : if (tmfd.traversed)
3349 : {
3350 : /*
3351 : * Recheck the tuple using EPQ. For MERGE, we leave this
3352 : * to the caller (it must do additional rechecking, and
3353 : * might end up executing a different action entirely).
3354 : */
3355 26 : if (estate->es_plannedstmt->commandType == CMD_MERGE)
3356 : {
3357 14 : if (tmresultp)
3358 14 : *tmresultp = TM_Updated;
3359 14 : return false;
3360 : }
3361 :
3362 12 : *epqslot = EvalPlanQual(epqstate,
3363 : relation,
3364 : relinfo->ri_RangeTableIndex,
3365 : oldslot);
3366 :
3367 : /*
3368 : * If PlanQual failed for updated tuple - we must not
3369 : * process this tuple!
3370 : */
3371 12 : if (TupIsNull(*epqslot))
3372 : {
3373 4 : *epqslot = NULL;
3374 4 : return false;
3375 : }
3376 : }
3377 2866 : break;
3378 :
3379 2 : case TM_Updated:
3380 2 : if (IsolationUsesXactSnapshot())
3381 2 : ereport(ERROR,
3382 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3383 : errmsg("could not serialize access due to concurrent update")));
3384 0 : elog(ERROR, "unexpected table_tuple_lock status: %u", test);
3385 : break;
3386 :
3387 16 : case TM_Deleted:
3388 16 : if (IsolationUsesXactSnapshot())
3389 2 : ereport(ERROR,
3390 : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3391 : errmsg("could not serialize access due to concurrent delete")));
3392 : /* tuple was deleted */
3393 14 : return false;
3394 :
3395 0 : case TM_Invisible:
3396 0 : elog(ERROR, "attempted to lock invisible tuple");
3397 : break;
3398 :
3399 0 : default:
3400 0 : elog(ERROR, "unrecognized table_tuple_lock status: %u", test);
3401 : return false; /* keep compiler quiet */
3402 : }
3403 : }
3404 : else
3405 : {
3406 : /*
3407 : * We expect the tuple to be present, thus very simple error handling
3408 : * suffices.
3409 : */
3410 9302 : if (!table_tuple_fetch_row_version(relation, tid, SnapshotAny,
3411 : oldslot))
3412 0 : elog(ERROR, "failed to fetch tuple for trigger");
3413 : }
3414 :
3415 12168 : return true;
3416 : }
3417 :
3418 : /*
3419 : * Is trigger enabled to fire?
3420 : */
3421 : static bool
3422 23744 : TriggerEnabled(EState *estate, ResultRelInfo *relinfo,
3423 : Trigger *trigger, TriggerEvent event,
3424 : Bitmapset *modifiedCols,
3425 : TupleTableSlot *oldslot, TupleTableSlot *newslot)
3426 : {
3427 : /* Check replication-role-dependent enable state */
3428 23744 : if (SessionReplicationRole == SESSION_REPLICATION_ROLE_REPLICA)
3429 : {
3430 126 : if (trigger->tgenabled == TRIGGER_FIRES_ON_ORIGIN ||
3431 78 : trigger->tgenabled == TRIGGER_DISABLED)
3432 84 : return false;
3433 : }
3434 : else /* ORIGIN or LOCAL role */
3435 : {
3436 23618 : if (trigger->tgenabled == TRIGGER_FIRES_ON_REPLICA ||
3437 23616 : trigger->tgenabled == TRIGGER_DISABLED)
3438 158 : return false;
3439 : }
3440 :
3441 : /*
3442 : * Check for column-specific trigger (only possible for UPDATE, and in
3443 : * fact we *must* ignore tgattr for other event types)
3444 : */
3445 23502 : if (trigger->tgnattr > 0 && TRIGGER_FIRED_BY_UPDATE(event))
3446 : {
3447 : int i;
3448 : bool modified;
3449 :
3450 424 : modified = false;
3451 556 : for (i = 0; i < trigger->tgnattr; i++)
3452 : {
3453 472 : if (bms_is_member(trigger->tgattr[i] - FirstLowInvalidHeapAttributeNumber,
3454 : modifiedCols))
3455 : {
3456 340 : modified = true;
3457 340 : break;
3458 : }
3459 : }
3460 424 : if (!modified)
3461 84 : return false;
3462 : }
3463 :
3464 : /* Check for WHEN clause */
3465 23418 : if (trigger->tgqual)
3466 : {
3467 : ExprState **predicate;
3468 : ExprContext *econtext;
3469 : MemoryContext oldContext;
3470 : int i;
3471 :
3472 : Assert(estate != NULL);
3473 :
3474 : /*
3475 : * trigger is an element of relinfo->ri_TrigDesc->triggers[]; find the
3476 : * matching element of relinfo->ri_TrigWhenExprs[]
3477 : */
3478 450 : i = trigger - relinfo->ri_TrigDesc->triggers;
3479 450 : predicate = &relinfo->ri_TrigWhenExprs[i];
3480 :
3481 : /*
3482 : * If first time through for this WHEN expression, build expression
3483 : * nodetrees for it. Keep them in the per-query memory context so
3484 : * they'll survive throughout the query.
3485 : */
3486 450 : if (*predicate == NULL)
3487 : {
3488 : Node *tgqual;
3489 :
3490 242 : oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
3491 242 : tgqual = stringToNode(trigger->tgqual);
3492 : /* Change references to OLD and NEW to INNER_VAR and OUTER_VAR */
3493 242 : ChangeVarNodes(tgqual, PRS2_OLD_VARNO, INNER_VAR, 0);
3494 242 : ChangeVarNodes(tgqual, PRS2_NEW_VARNO, OUTER_VAR, 0);
3495 : /* ExecPrepareQual wants implicit-AND form */
3496 242 : tgqual = (Node *) make_ands_implicit((Expr *) tgqual);
3497 242 : *predicate = ExecPrepareQual((List *) tgqual, estate);
3498 242 : MemoryContextSwitchTo(oldContext);
3499 : }
3500 :
3501 : /*
3502 : * We will use the EState's per-tuple context for evaluating WHEN
3503 : * expressions (creating it if it's not already there).
3504 : */
3505 450 : econtext = GetPerTupleExprContext(estate);
3506 :
3507 : /*
3508 : * Finally evaluate the expression, making the old and/or new tuples
3509 : * available as INNER_VAR/OUTER_VAR respectively.
3510 : */
3511 450 : econtext->ecxt_innertuple = oldslot;
3512 450 : econtext->ecxt_outertuple = newslot;
3513 450 : if (!ExecQual(*predicate, econtext))
3514 240 : return false;
3515 : }
3516 :
3517 23178 : return true;
3518 : }
3519 :
3520 :
3521 : /* ----------
3522 : * After-trigger stuff
3523 : *
3524 : * The AfterTriggersData struct holds data about pending AFTER trigger events
3525 : * during the current transaction tree. (BEFORE triggers are fired
3526 : * immediately so we don't need any persistent state about them.) The struct
3527 : * and most of its subsidiary data are kept in TopTransactionContext; however
3528 : * some data that can be discarded sooner appears in the CurTransactionContext
3529 : * of the relevant subtransaction. Also, the individual event records are
3530 : * kept in a separate sub-context of TopTransactionContext. This is done
3531 : * mainly so that it's easy to tell from a memory context dump how much space
3532 : * is being eaten by trigger events.
3533 : *
3534 : * Because the list of pending events can grow large, we go to some
3535 : * considerable effort to minimize per-event memory consumption. The event
3536 : * records are grouped into chunks and common data for similar events in the
3537 : * same chunk is only stored once.
3538 : *
3539 : * XXX We need to be able to save the per-event data in a file if it grows too
3540 : * large.
3541 : * ----------
3542 : */
3543 :
3544 : /* Per-trigger SET CONSTRAINT status */
3545 : typedef struct SetConstraintTriggerData
3546 : {
3547 : Oid sct_tgoid;
3548 : bool sct_tgisdeferred;
3549 : } SetConstraintTriggerData;
3550 :
3551 : typedef struct SetConstraintTriggerData *SetConstraintTrigger;
3552 :
3553 : /*
3554 : * SET CONSTRAINT intra-transaction status.
3555 : *
3556 : * We make this a single palloc'd object so it can be copied and freed easily.
3557 : *
3558 : * all_isset and all_isdeferred are used to keep track
3559 : * of SET CONSTRAINTS ALL {DEFERRED, IMMEDIATE}.
3560 : *
3561 : * trigstates[] stores per-trigger tgisdeferred settings.
3562 : */
3563 : typedef struct SetConstraintStateData
3564 : {
3565 : bool all_isset;
3566 : bool all_isdeferred;
3567 : int numstates; /* number of trigstates[] entries in use */
3568 : int numalloc; /* allocated size of trigstates[] */
3569 : SetConstraintTriggerData trigstates[FLEXIBLE_ARRAY_MEMBER];
3570 : } SetConstraintStateData;
3571 :
3572 : typedef SetConstraintStateData *SetConstraintState;
3573 :
3574 :
3575 : /*
3576 : * Per-trigger-event data
3577 : *
3578 : * The actual per-event data, AfterTriggerEventData, includes DONE/IN_PROGRESS
3579 : * status bits, up to two tuple CTIDs, and optionally two OIDs of partitions.
3580 : * Each event record also has an associated AfterTriggerSharedData that is
3581 : * shared across all instances of similar events within a "chunk".
3582 : *
3583 : * For row-level triggers, we arrange not to waste storage on unneeded ctid
3584 : * fields. Updates of regular tables use two; inserts and deletes of regular
3585 : * tables use one; foreign tables always use zero and save the tuple(s) to a
3586 : * tuplestore. AFTER_TRIGGER_FDW_FETCH directs AfterTriggerExecute() to
3587 : * retrieve a fresh tuple or pair of tuples from that tuplestore, while
3588 : * AFTER_TRIGGER_FDW_REUSE directs it to use the most-recently-retrieved
3589 : * tuple(s). This permits storing tuples once regardless of the number of
3590 : * row-level triggers on a foreign table.
3591 : *
3592 : * When updates on partitioned tables cause rows to move between partitions,
3593 : * the OIDs of both partitions are stored too, so that the tuples can be
3594 : * fetched; such entries are marked AFTER_TRIGGER_CP_UPDATE (for "cross-
3595 : * partition update").
3596 : *
3597 : * Note that we need triggers on foreign tables to be fired in exactly the
3598 : * order they were queued, so that the tuples come out of the tuplestore in
3599 : * the right order. To ensure that, we forbid deferrable (constraint)
3600 : * triggers on foreign tables. This also ensures that such triggers do not
3601 : * get deferred into outer trigger query levels, meaning that it's okay to
3602 : * destroy the tuplestore at the end of the query level.
3603 : *
3604 : * Statement-level triggers always bear AFTER_TRIGGER_1CTID, though they
3605 : * require no ctid field. We lack the flag bit space to neatly represent that
3606 : * distinct case, and it seems unlikely to be worth much trouble.
3607 : *
3608 : * Note: ats_firing_id is initially zero and is set to something else when
3609 : * AFTER_TRIGGER_IN_PROGRESS is set. It indicates which trigger firing
3610 : * cycle the trigger will be fired in (or was fired in, if DONE is set).
3611 : * Although this is mutable state, we can keep it in AfterTriggerSharedData
3612 : * because all instances of the same type of event in a given event list will
3613 : * be fired at the same time, if they were queued between the same firing
3614 : * cycles. So we need only ensure that ats_firing_id is zero when attaching
3615 : * a new event to an existing AfterTriggerSharedData record.
3616 : */
3617 : typedef uint32 TriggerFlags;
3618 :
3619 : #define AFTER_TRIGGER_OFFSET 0x07FFFFFF /* must be low-order bits */
3620 : #define AFTER_TRIGGER_DONE 0x80000000
3621 : #define AFTER_TRIGGER_IN_PROGRESS 0x40000000
3622 : /* bits describing the size and tuple sources of this event */
3623 : #define AFTER_TRIGGER_FDW_REUSE 0x00000000
3624 : #define AFTER_TRIGGER_FDW_FETCH 0x20000000
3625 : #define AFTER_TRIGGER_1CTID 0x10000000
3626 : #define AFTER_TRIGGER_2CTID 0x30000000
3627 : #define AFTER_TRIGGER_CP_UPDATE 0x08000000
3628 : #define AFTER_TRIGGER_TUP_BITS 0x38000000
3629 : typedef struct AfterTriggerSharedData *AfterTriggerShared;
3630 :
3631 : typedef struct AfterTriggerSharedData
3632 : {
3633 : TriggerEvent ats_event; /* event type indicator, see trigger.h */
3634 : Oid ats_tgoid; /* the trigger's ID */
3635 : Oid ats_relid; /* the relation it's on */
3636 : CommandId ats_firing_id; /* ID for firing cycle */
3637 : struct AfterTriggersTableData *ats_table; /* transition table access */
3638 : Bitmapset *ats_modifiedcols; /* modified columns */
3639 : } AfterTriggerSharedData;
3640 :
3641 : typedef struct AfterTriggerEventData *AfterTriggerEvent;
3642 :
3643 : typedef struct AfterTriggerEventData
3644 : {
3645 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3646 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3647 : ItemPointerData ate_ctid2; /* new updated tuple */
3648 :
3649 : /*
3650 : * During a cross-partition update of a partitioned table, we also store
3651 : * the OIDs of source and destination partitions that are needed to fetch
3652 : * the old (ctid1) and the new tuple (ctid2) from, respectively.
3653 : */
3654 : Oid ate_src_part;
3655 : Oid ate_dst_part;
3656 : } AfterTriggerEventData;
3657 :
3658 : /* AfterTriggerEventData, minus ate_src_part, ate_dst_part */
3659 : typedef struct AfterTriggerEventDataNoOids
3660 : {
3661 : TriggerFlags ate_flags;
3662 : ItemPointerData ate_ctid1;
3663 : ItemPointerData ate_ctid2;
3664 : } AfterTriggerEventDataNoOids;
3665 :
3666 : /* AfterTriggerEventData, minus ate_*_part and ate_ctid2 */
3667 : typedef struct AfterTriggerEventDataOneCtid
3668 : {
3669 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3670 : ItemPointerData ate_ctid1; /* inserted, deleted, or old updated tuple */
3671 : } AfterTriggerEventDataOneCtid;
3672 :
3673 : /* AfterTriggerEventData, minus ate_*_part, ate_ctid1 and ate_ctid2 */
3674 : typedef struct AfterTriggerEventDataZeroCtids
3675 : {
3676 : TriggerFlags ate_flags; /* status bits and offset to shared data */
3677 : } AfterTriggerEventDataZeroCtids;
3678 :
3679 : #define SizeofTriggerEvent(evt) \
3680 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_CP_UPDATE ? \
3681 : sizeof(AfterTriggerEventData) : \
3682 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ? \
3683 : sizeof(AfterTriggerEventDataNoOids) : \
3684 : (((evt)->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_1CTID ? \
3685 : sizeof(AfterTriggerEventDataOneCtid) : \
3686 : sizeof(AfterTriggerEventDataZeroCtids))))
3687 :
3688 : #define GetTriggerSharedData(evt) \
3689 : ((AfterTriggerShared) ((char *) (evt) + ((evt)->ate_flags & AFTER_TRIGGER_OFFSET)))
3690 :
3691 : /*
3692 : * To avoid palloc overhead, we keep trigger events in arrays in successively-
3693 : * larger chunks (a slightly more sophisticated version of an expansible
3694 : * array). The space between CHUNK_DATA_START and freeptr is occupied by
3695 : * AfterTriggerEventData records; the space between endfree and endptr is
3696 : * occupied by AfterTriggerSharedData records.
3697 : */
3698 : typedef struct AfterTriggerEventChunk
3699 : {
3700 : struct AfterTriggerEventChunk *next; /* list link */
3701 : char *freeptr; /* start of free space in chunk */
3702 : char *endfree; /* end of free space in chunk */
3703 : char *endptr; /* end of chunk */
3704 : /* event data follows here */
3705 : } AfterTriggerEventChunk;
3706 :
3707 : #define CHUNK_DATA_START(cptr) ((char *) (cptr) + MAXALIGN(sizeof(AfterTriggerEventChunk)))
3708 :
3709 : /* A list of events */
3710 : typedef struct AfterTriggerEventList
3711 : {
3712 : AfterTriggerEventChunk *head;
3713 : AfterTriggerEventChunk *tail;
3714 : char *tailfree; /* freeptr of tail chunk */
3715 : } AfterTriggerEventList;
3716 :
3717 : /* Macros to help in iterating over a list of events */
3718 : #define for_each_chunk(cptr, evtlist) \
3719 : for (cptr = (evtlist).head; cptr != NULL; cptr = cptr->next)
3720 : #define for_each_event(eptr, cptr) \
3721 : for (eptr = (AfterTriggerEvent) CHUNK_DATA_START(cptr); \
3722 : (char *) eptr < (cptr)->freeptr; \
3723 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3724 : /* Use this if no special per-chunk processing is needed */
3725 : #define for_each_event_chunk(eptr, cptr, evtlist) \
3726 : for_each_chunk(cptr, evtlist) for_each_event(eptr, cptr)
3727 :
3728 : /* Macros for iterating from a start point that might not be list start */
3729 : #define for_each_chunk_from(cptr) \
3730 : for (; cptr != NULL; cptr = cptr->next)
3731 : #define for_each_event_from(eptr, cptr) \
3732 : for (; \
3733 : (char *) eptr < (cptr)->freeptr; \
3734 : eptr = (AfterTriggerEvent) (((char *) eptr) + SizeofTriggerEvent(eptr)))
3735 :
3736 :
3737 : /*
3738 : * All per-transaction data for the AFTER TRIGGERS module.
3739 : *
3740 : * AfterTriggersData has the following fields:
3741 : *
3742 : * firing_counter is incremented for each call of afterTriggerInvokeEvents.
3743 : * We mark firable events with the current firing cycle's ID so that we can
3744 : * tell which ones to work on. This ensures sane behavior if a trigger
3745 : * function chooses to do SET CONSTRAINTS: the inner SET CONSTRAINTS will
3746 : * only fire those events that weren't already scheduled for firing.
3747 : *
3748 : * state keeps track of the transaction-local effects of SET CONSTRAINTS.
3749 : * This is saved and restored across failed subtransactions.
3750 : *
3751 : * events is the current list of deferred events. This is global across
3752 : * all subtransactions of the current transaction. In a subtransaction
3753 : * abort, we know that the events added by the subtransaction are at the
3754 : * end of the list, so it is relatively easy to discard them. The event
3755 : * list chunks themselves are stored in event_cxt.
3756 : *
3757 : * query_depth is the current depth of nested AfterTriggerBeginQuery calls
3758 : * (-1 when the stack is empty).
3759 : *
3760 : * query_stack[query_depth] is the per-query-level data, including these fields:
3761 : *
3762 : * events is a list of AFTER trigger events queued by the current query.
3763 : * None of these are valid until the matching AfterTriggerEndQuery call
3764 : * occurs. At that point we fire immediate-mode triggers, and append any
3765 : * deferred events to the main events list.
3766 : *
3767 : * fdw_tuplestore is a tuplestore containing the foreign-table tuples
3768 : * needed by events queued by the current query. (Note: we use just one
3769 : * tuplestore even though more than one foreign table might be involved.
3770 : * This is okay because tuplestores don't really care what's in the tuples
3771 : * they store; but it's possible that someday it'd break.)
3772 : *
3773 : * tables is a List of AfterTriggersTableData structs for target tables
3774 : * of the current query (see below).
3775 : *
3776 : * maxquerydepth is just the allocated length of query_stack.
3777 : *
3778 : * trans_stack holds per-subtransaction data, including these fields:
3779 : *
3780 : * state is NULL or a pointer to a saved copy of the SET CONSTRAINTS
3781 : * state data. Each subtransaction level that modifies that state first
3782 : * saves a copy, which we use to restore the state if we abort.
3783 : *
3784 : * events is a copy of the events head/tail pointers,
3785 : * which we use to restore those values during subtransaction abort.
3786 : *
3787 : * query_depth is the subtransaction-start-time value of query_depth,
3788 : * which we similarly use to clean up at subtransaction abort.
3789 : *
3790 : * firing_counter is the subtransaction-start-time value of firing_counter.
3791 : * We use this to recognize which deferred triggers were fired (or marked
3792 : * for firing) within an aborted subtransaction.
3793 : *
3794 : * We use GetCurrentTransactionNestLevel() to determine the correct array
3795 : * index in trans_stack. maxtransdepth is the number of allocated entries in
3796 : * trans_stack. (By not keeping our own stack pointer, we can avoid trouble
3797 : * in cases where errors during subxact abort cause multiple invocations
3798 : * of AfterTriggerEndSubXact() at the same nesting depth.)
3799 : *
3800 : * We create an AfterTriggersTableData struct for each target table of the
3801 : * current query, and each operation mode (INSERT/UPDATE/DELETE), that has
3802 : * either transition tables or statement-level triggers. This is used to
3803 : * hold the relevant transition tables, as well as info tracking whether
3804 : * we already queued the statement triggers. (We use that info to prevent
3805 : * firing the same statement triggers more than once per statement, or really
3806 : * once per transition table set.) These structs, along with the transition
3807 : * table tuplestores, live in the (sub)transaction's CurTransactionContext.
3808 : * That's sufficient lifespan because we don't allow transition tables to be
3809 : * used by deferrable triggers, so they only need to survive until
3810 : * AfterTriggerEndQuery.
3811 : */
3812 : typedef struct AfterTriggersQueryData AfterTriggersQueryData;
3813 : typedef struct AfterTriggersTransData AfterTriggersTransData;
3814 : typedef struct AfterTriggersTableData AfterTriggersTableData;
3815 :
3816 : typedef struct AfterTriggersData
3817 : {
3818 : CommandId firing_counter; /* next firing ID to assign */
3819 : SetConstraintState state; /* the active S C state */
3820 : AfterTriggerEventList events; /* deferred-event list */
3821 : MemoryContext event_cxt; /* memory context for events, if any */
3822 :
3823 : /* per-query-level data: */
3824 : AfterTriggersQueryData *query_stack; /* array of structs shown below */
3825 : int query_depth; /* current index in above array */
3826 : int maxquerydepth; /* allocated len of above array */
3827 :
3828 : /* per-subtransaction-level data: */
3829 : AfterTriggersTransData *trans_stack; /* array of structs shown below */
3830 : int maxtransdepth; /* allocated len of above array */
3831 : } AfterTriggersData;
3832 :
3833 : struct AfterTriggersQueryData
3834 : {
3835 : AfterTriggerEventList events; /* events pending from this query */
3836 : Tuplestorestate *fdw_tuplestore; /* foreign tuples for said events */
3837 : List *tables; /* list of AfterTriggersTableData, see below */
3838 : };
3839 :
3840 : struct AfterTriggersTransData
3841 : {
3842 : /* these fields are just for resetting at subtrans abort: */
3843 : SetConstraintState state; /* saved S C state, or NULL if not yet saved */
3844 : AfterTriggerEventList events; /* saved list pointer */
3845 : int query_depth; /* saved query_depth */
3846 : CommandId firing_counter; /* saved firing_counter */
3847 : };
3848 :
3849 : struct AfterTriggersTableData
3850 : {
3851 : /* relid + cmdType form the lookup key for these structs: */
3852 : Oid relid; /* target table's OID */
3853 : CmdType cmdType; /* event type, CMD_INSERT/UPDATE/DELETE */
3854 : bool closed; /* true when no longer OK to add tuples */
3855 : bool before_trig_done; /* did we already queue BS triggers? */
3856 : bool after_trig_done; /* did we already queue AS triggers? */
3857 : AfterTriggerEventList after_trig_events; /* if so, saved list pointer */
3858 :
3859 : /*
3860 : * We maintain separate transition tables for UPDATE/INSERT/DELETE since
3861 : * MERGE can run all three actions in a single statement. Note that UPDATE
3862 : * needs both old and new transition tables whereas INSERT needs only new,
3863 : * and DELETE needs only old.
3864 : */
3865 :
3866 : /* "old" transition table for UPDATE, if any */
3867 : Tuplestorestate *old_upd_tuplestore;
3868 : /* "new" transition table for UPDATE, if any */
3869 : Tuplestorestate *new_upd_tuplestore;
3870 : /* "old" transition table for DELETE, if any */
3871 : Tuplestorestate *old_del_tuplestore;
3872 : /* "new" transition table for INSERT, if any */
3873 : Tuplestorestate *new_ins_tuplestore;
3874 :
3875 : TupleTableSlot *storeslot; /* for converting to tuplestore's format */
3876 : };
3877 :
3878 : static AfterTriggersData afterTriggers;
3879 :
3880 : static void AfterTriggerExecute(EState *estate,
3881 : AfterTriggerEvent event,
3882 : ResultRelInfo *relInfo,
3883 : ResultRelInfo *src_relInfo,
3884 : ResultRelInfo *dst_relInfo,
3885 : TriggerDesc *trigdesc,
3886 : FmgrInfo *finfo,
3887 : Instrumentation *instr,
3888 : MemoryContext per_tuple_context,
3889 : TupleTableSlot *trig_tuple_slot1,
3890 : TupleTableSlot *trig_tuple_slot2);
3891 : static AfterTriggersTableData *GetAfterTriggersTableData(Oid relid,
3892 : CmdType cmdType);
3893 : static TupleTableSlot *GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
3894 : TupleDesc tupdesc);
3895 : static Tuplestorestate *GetAfterTriggersTransitionTable(int event,
3896 : TupleTableSlot *oldslot,
3897 : TupleTableSlot *newslot,
3898 : TransitionCaptureState *transition_capture);
3899 : static void TransitionTableAddTuple(EState *estate,
3900 : TransitionCaptureState *transition_capture,
3901 : ResultRelInfo *relinfo,
3902 : TupleTableSlot *slot,
3903 : TupleTableSlot *original_insert_tuple,
3904 : Tuplestorestate *tuplestore);
3905 : static void AfterTriggerFreeQuery(AfterTriggersQueryData *qs);
3906 : static SetConstraintState SetConstraintStateCreate(int numalloc);
3907 : static SetConstraintState SetConstraintStateCopy(SetConstraintState origstate);
3908 : static SetConstraintState SetConstraintStateAddItem(SetConstraintState state,
3909 : Oid tgoid, bool tgisdeferred);
3910 : static void cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent);
3911 :
3912 :
3913 : /*
3914 : * Get the FDW tuplestore for the current trigger query level, creating it
3915 : * if necessary.
3916 : */
3917 : static Tuplestorestate *
3918 100 : GetCurrentFDWTuplestore(void)
3919 : {
3920 : Tuplestorestate *ret;
3921 :
3922 100 : ret = afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore;
3923 100 : if (ret == NULL)
3924 : {
3925 : MemoryContext oldcxt;
3926 : ResourceOwner saveResourceOwner;
3927 :
3928 : /*
3929 : * Make the tuplestore valid until end of subtransaction. We really
3930 : * only need it until AfterTriggerEndQuery().
3931 : */
3932 36 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
3933 36 : saveResourceOwner = CurrentResourceOwner;
3934 36 : CurrentResourceOwner = CurTransactionResourceOwner;
3935 :
3936 36 : ret = tuplestore_begin_heap(false, false, work_mem);
3937 :
3938 36 : CurrentResourceOwner = saveResourceOwner;
3939 36 : MemoryContextSwitchTo(oldcxt);
3940 :
3941 36 : afterTriggers.query_stack[afterTriggers.query_depth].fdw_tuplestore = ret;
3942 : }
3943 :
3944 100 : return ret;
3945 : }
3946 :
3947 : /* ----------
3948 : * afterTriggerCheckState()
3949 : *
3950 : * Returns true if the trigger event is actually in state DEFERRED.
3951 : * ----------
3952 : */
3953 : static bool
3954 11142 : afterTriggerCheckState(AfterTriggerShared evtshared)
3955 : {
3956 11142 : Oid tgoid = evtshared->ats_tgoid;
3957 11142 : SetConstraintState state = afterTriggers.state;
3958 : int i;
3959 :
3960 : /*
3961 : * For not-deferrable triggers (i.e. normal AFTER ROW triggers and
3962 : * constraints declared NOT DEFERRABLE), the state is always false.
3963 : */
3964 11142 : if ((evtshared->ats_event & AFTER_TRIGGER_DEFERRABLE) == 0)
3965 10486 : return false;
3966 :
3967 : /*
3968 : * If constraint state exists, SET CONSTRAINTS might have been executed
3969 : * either for this trigger or for all triggers.
3970 : */
3971 656 : if (state != NULL)
3972 : {
3973 : /* Check for SET CONSTRAINTS for this specific trigger. */
3974 314 : for (i = 0; i < state->numstates; i++)
3975 : {
3976 248 : if (state->trigstates[i].sct_tgoid == tgoid)
3977 60 : return state->trigstates[i].sct_tgisdeferred;
3978 : }
3979 :
3980 : /* Check for SET CONSTRAINTS ALL. */
3981 66 : if (state->all_isset)
3982 54 : return state->all_isdeferred;
3983 : }
3984 :
3985 : /*
3986 : * Otherwise return the default state for the trigger.
3987 : */
3988 542 : return ((evtshared->ats_event & AFTER_TRIGGER_INITDEFERRED) != 0);
3989 : }
3990 :
3991 : /* ----------
3992 : * afterTriggerCopyBitmap()
3993 : *
3994 : * Copy bitmap into AfterTriggerEvents memory context, which is where the after
3995 : * trigger events are kept.
3996 : * ----------
3997 : */
3998 : static Bitmapset *
3999 11186 : afterTriggerCopyBitmap(Bitmapset *src)
4000 : {
4001 : Bitmapset *dst;
4002 : MemoryContext oldcxt;
4003 :
4004 11186 : if (src == NULL)
4005 7760 : return NULL;
4006 :
4007 : /* Create event context if we didn't already */
4008 3426 : if (afterTriggers.event_cxt == NULL)
4009 1088 : afterTriggers.event_cxt =
4010 1088 : AllocSetContextCreate(TopTransactionContext,
4011 : "AfterTriggerEvents",
4012 : ALLOCSET_DEFAULT_SIZES);
4013 :
4014 3426 : oldcxt = MemoryContextSwitchTo(afterTriggers.event_cxt);
4015 :
4016 3426 : dst = bms_copy(src);
4017 :
4018 3426 : MemoryContextSwitchTo(oldcxt);
4019 :
4020 3426 : return dst;
4021 : }
4022 :
4023 : /* ----------
4024 : * afterTriggerAddEvent()
4025 : *
4026 : * Add a new trigger event to the specified queue.
4027 : * The passed-in event data is copied.
4028 : * ----------
4029 : */
4030 : static void
4031 11722 : afterTriggerAddEvent(AfterTriggerEventList *events,
4032 : AfterTriggerEvent event, AfterTriggerShared evtshared)
4033 : {
4034 11722 : Size eventsize = SizeofTriggerEvent(event);
4035 11722 : Size needed = eventsize + sizeof(AfterTriggerSharedData);
4036 : AfterTriggerEventChunk *chunk;
4037 : AfterTriggerShared newshared;
4038 : AfterTriggerEvent newevent;
4039 :
4040 : /*
4041 : * If empty list or not enough room in the tail chunk, make a new chunk.
4042 : * We assume here that a new shared record will always be needed.
4043 : */
4044 11722 : chunk = events->tail;
4045 11722 : if (chunk == NULL ||
4046 4558 : chunk->endfree - chunk->freeptr < needed)
4047 : {
4048 : Size chunksize;
4049 :
4050 : /* Create event context if we didn't already */
4051 7164 : if (afterTriggers.event_cxt == NULL)
4052 4932 : afterTriggers.event_cxt =
4053 4932 : AllocSetContextCreate(TopTransactionContext,
4054 : "AfterTriggerEvents",
4055 : ALLOCSET_DEFAULT_SIZES);
4056 :
4057 : /*
4058 : * Chunk size starts at 1KB and is allowed to increase up to 1MB.
4059 : * These numbers are fairly arbitrary, though there is a hard limit at
4060 : * AFTER_TRIGGER_OFFSET; else we couldn't link event records to their
4061 : * shared records using the available space in ate_flags. Another
4062 : * constraint is that if the chunk size gets too huge, the search loop
4063 : * below would get slow given a (not too common) usage pattern with
4064 : * many distinct event types in a chunk. Therefore, we double the
4065 : * preceding chunk size only if there weren't too many shared records
4066 : * in the preceding chunk; otherwise we halve it. This gives us some
4067 : * ability to adapt to the actual usage pattern of the current query
4068 : * while still having large chunk sizes in typical usage. All chunk
4069 : * sizes used should be MAXALIGN multiples, to ensure that the shared
4070 : * records will be aligned safely.
4071 : */
4072 : #define MIN_CHUNK_SIZE 1024
4073 : #define MAX_CHUNK_SIZE (1024*1024)
4074 :
4075 : #if MAX_CHUNK_SIZE > (AFTER_TRIGGER_OFFSET+1)
4076 : #error MAX_CHUNK_SIZE must not exceed AFTER_TRIGGER_OFFSET
4077 : #endif
4078 :
4079 7164 : if (chunk == NULL)
4080 7164 : chunksize = MIN_CHUNK_SIZE;
4081 : else
4082 : {
4083 : /* preceding chunk size... */
4084 0 : chunksize = chunk->endptr - (char *) chunk;
4085 : /* check number of shared records in preceding chunk */
4086 0 : if ((chunk->endptr - chunk->endfree) <=
4087 : (100 * sizeof(AfterTriggerSharedData)))
4088 0 : chunksize *= 2; /* okay, double it */
4089 : else
4090 0 : chunksize /= 2; /* too many shared records */
4091 0 : chunksize = Min(chunksize, MAX_CHUNK_SIZE);
4092 : }
4093 7164 : chunk = MemoryContextAlloc(afterTriggers.event_cxt, chunksize);
4094 7164 : chunk->next = NULL;
4095 7164 : chunk->freeptr = CHUNK_DATA_START(chunk);
4096 7164 : chunk->endptr = chunk->endfree = (char *) chunk + chunksize;
4097 : Assert(chunk->endfree - chunk->freeptr >= needed);
4098 :
4099 7164 : if (events->head == NULL)
4100 7164 : events->head = chunk;
4101 : else
4102 0 : events->tail->next = chunk;
4103 7164 : events->tail = chunk;
4104 : /* events->tailfree is now out of sync, but we'll fix it below */
4105 : }
4106 :
4107 : /*
4108 : * Try to locate a matching shared-data record already in the chunk. If
4109 : * none, make a new one.
4110 : */
4111 11722 : for (newshared = ((AfterTriggerShared) chunk->endptr) - 1;
4112 16940 : (char *) newshared >= chunk->endfree;
4113 5218 : newshared--)
4114 : {
4115 6652 : if (newshared->ats_tgoid == evtshared->ats_tgoid &&
4116 1614 : newshared->ats_relid == evtshared->ats_relid &&
4117 1614 : newshared->ats_event == evtshared->ats_event &&
4118 1608 : newshared->ats_table == evtshared->ats_table &&
4119 1572 : newshared->ats_firing_id == 0)
4120 1434 : break;
4121 : }
4122 11722 : if ((char *) newshared < chunk->endfree)
4123 : {
4124 10288 : *newshared = *evtshared;
4125 10288 : newshared->ats_firing_id = 0; /* just to be sure */
4126 10288 : chunk->endfree = (char *) newshared;
4127 : }
4128 :
4129 : /* Insert the data */
4130 11722 : newevent = (AfterTriggerEvent) chunk->freeptr;
4131 11722 : memcpy(newevent, event, eventsize);
4132 : /* ... and link the new event to its shared record */
4133 11722 : newevent->ate_flags &= ~AFTER_TRIGGER_OFFSET;
4134 11722 : newevent->ate_flags |= (char *) newshared - (char *) newevent;
4135 :
4136 11722 : chunk->freeptr += eventsize;
4137 11722 : events->tailfree = chunk->freeptr;
4138 11722 : }
4139 :
4140 : /* ----------
4141 : * afterTriggerFreeEventList()
4142 : *
4143 : * Free all the event storage in the given list.
4144 : * ----------
4145 : */
4146 : static void
4147 16506 : afterTriggerFreeEventList(AfterTriggerEventList *events)
4148 : {
4149 : AfterTriggerEventChunk *chunk;
4150 :
4151 22440 : while ((chunk = events->head) != NULL)
4152 : {
4153 5934 : events->head = chunk->next;
4154 5934 : pfree(chunk);
4155 : }
4156 16506 : events->tail = NULL;
4157 16506 : events->tailfree = NULL;
4158 16506 : }
4159 :
4160 : /* ----------
4161 : * afterTriggerRestoreEventList()
4162 : *
4163 : * Restore an event list to its prior length, removing all the events
4164 : * added since it had the value old_events.
4165 : * ----------
4166 : */
4167 : static void
4168 9200 : afterTriggerRestoreEventList(AfterTriggerEventList *events,
4169 : const AfterTriggerEventList *old_events)
4170 : {
4171 : AfterTriggerEventChunk *chunk;
4172 : AfterTriggerEventChunk *next_chunk;
4173 :
4174 9200 : if (old_events->tail == NULL)
4175 : {
4176 : /* restoring to a completely empty state, so free everything */
4177 9178 : afterTriggerFreeEventList(events);
4178 : }
4179 : else
4180 : {
4181 22 : *events = *old_events;
4182 : /* free any chunks after the last one we want to keep */
4183 22 : for (chunk = events->tail->next; chunk != NULL; chunk = next_chunk)
4184 : {
4185 0 : next_chunk = chunk->next;
4186 0 : pfree(chunk);
4187 : }
4188 : /* and clean up the tail chunk to be the right length */
4189 22 : events->tail->next = NULL;
4190 22 : events->tail->freeptr = events->tailfree;
4191 :
4192 : /*
4193 : * We don't make any effort to remove now-unused shared data records.
4194 : * They might still be useful, anyway.
4195 : */
4196 : }
4197 9200 : }
4198 :
4199 : /* ----------
4200 : * afterTriggerDeleteHeadEventChunk()
4201 : *
4202 : * Remove the first chunk of events from the query level's event list.
4203 : * Keep any event list pointers elsewhere in the query level's data
4204 : * structures in sync.
4205 : * ----------
4206 : */
4207 : static void
4208 0 : afterTriggerDeleteHeadEventChunk(AfterTriggersQueryData *qs)
4209 : {
4210 0 : AfterTriggerEventChunk *target = qs->events.head;
4211 : ListCell *lc;
4212 :
4213 : Assert(target && target->next);
4214 :
4215 : /*
4216 : * First, update any pointers in the per-table data, so that they won't be
4217 : * dangling. Resetting obsoleted pointers to NULL will make
4218 : * cancel_prior_stmt_triggers start from the list head, which is fine.
4219 : */
4220 0 : foreach(lc, qs->tables)
4221 : {
4222 0 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
4223 :
4224 0 : if (table->after_trig_done &&
4225 0 : table->after_trig_events.tail == target)
4226 : {
4227 0 : table->after_trig_events.head = NULL;
4228 0 : table->after_trig_events.tail = NULL;
4229 0 : table->after_trig_events.tailfree = NULL;
4230 : }
4231 : }
4232 :
4233 : /* Now we can flush the head chunk */
4234 0 : qs->events.head = target->next;
4235 0 : pfree(target);
4236 0 : }
4237 :
4238 :
4239 : /* ----------
4240 : * AfterTriggerExecute()
4241 : *
4242 : * Fetch the required tuples back from the heap and fire one
4243 : * single trigger function.
4244 : *
4245 : * Frequently, this will be fired many times in a row for triggers of
4246 : * a single relation. Therefore, we cache the open relation and provide
4247 : * fmgr lookup cache space at the caller level. (For triggers fired at
4248 : * the end of a query, we can even piggyback on the executor's state.)
4249 : *
4250 : * When fired for a cross-partition update of a partitioned table, the old
4251 : * tuple is fetched using 'src_relInfo' (the source leaf partition) and
4252 : * the new tuple using 'dst_relInfo' (the destination leaf partition), though
4253 : * both are converted into the root partitioned table's format before passing
4254 : * to the trigger function.
4255 : *
4256 : * event: event currently being fired.
4257 : * relInfo: result relation for event.
4258 : * src_relInfo: source partition of a cross-partition update
4259 : * dst_relInfo: its destination partition
4260 : * trigdesc: working copy of rel's trigger info.
4261 : * finfo: array of fmgr lookup cache entries (one per trigger in trigdesc).
4262 : * instr: array of EXPLAIN ANALYZE instrumentation nodes (one per trigger),
4263 : * or NULL if no instrumentation is wanted.
4264 : * per_tuple_context: memory context to call trigger function in.
4265 : * trig_tuple_slot1: scratch slot for tg_trigtuple (foreign tables only)
4266 : * trig_tuple_slot2: scratch slot for tg_newtuple (foreign tables only)
4267 : * ----------
4268 : */
4269 : static void
4270 10876 : AfterTriggerExecute(EState *estate,
4271 : AfterTriggerEvent event,
4272 : ResultRelInfo *relInfo,
4273 : ResultRelInfo *src_relInfo,
4274 : ResultRelInfo *dst_relInfo,
4275 : TriggerDesc *trigdesc,
4276 : FmgrInfo *finfo, Instrumentation *instr,
4277 : MemoryContext per_tuple_context,
4278 : TupleTableSlot *trig_tuple_slot1,
4279 : TupleTableSlot *trig_tuple_slot2)
4280 : {
4281 10876 : Relation rel = relInfo->ri_RelationDesc;
4282 10876 : Relation src_rel = src_relInfo->ri_RelationDesc;
4283 10876 : Relation dst_rel = dst_relInfo->ri_RelationDesc;
4284 10876 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4285 10876 : Oid tgoid = evtshared->ats_tgoid;
4286 10876 : TriggerData LocTriggerData = {0};
4287 : HeapTuple rettuple;
4288 : int tgindx;
4289 10876 : bool should_free_trig = false;
4290 10876 : bool should_free_new = false;
4291 :
4292 : /*
4293 : * Locate trigger in trigdesc. It might not be present, and in fact the
4294 : * trigdesc could be NULL, if the trigger was dropped since the event was
4295 : * queued. In that case, silently do nothing.
4296 : */
4297 10876 : if (trigdesc == NULL)
4298 6 : return;
4299 24766 : for (tgindx = 0; tgindx < trigdesc->numtriggers; tgindx++)
4300 : {
4301 24766 : if (trigdesc->triggers[tgindx].tgoid == tgoid)
4302 : {
4303 10870 : LocTriggerData.tg_trigger = &(trigdesc->triggers[tgindx]);
4304 10870 : break;
4305 : }
4306 : }
4307 10870 : if (LocTriggerData.tg_trigger == NULL)
4308 0 : return;
4309 :
4310 : /*
4311 : * If doing EXPLAIN ANALYZE, start charging time to this trigger. We want
4312 : * to include time spent re-fetching tuples in the trigger cost.
4313 : */
4314 10870 : if (instr)
4315 0 : InstrStartNode(instr + tgindx);
4316 :
4317 : /*
4318 : * Fetch the required tuple(s).
4319 : */
4320 10870 : switch (event->ate_flags & AFTER_TRIGGER_TUP_BITS)
4321 : {
4322 50 : case AFTER_TRIGGER_FDW_FETCH:
4323 : {
4324 50 : Tuplestorestate *fdw_tuplestore = GetCurrentFDWTuplestore();
4325 :
4326 50 : if (!tuplestore_gettupleslot(fdw_tuplestore, true, false,
4327 : trig_tuple_slot1))
4328 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4329 :
4330 50 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4331 18 : TRIGGER_EVENT_UPDATE &&
4332 18 : !tuplestore_gettupleslot(fdw_tuplestore, true, false,
4333 : trig_tuple_slot2))
4334 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4335 : }
4336 : /* fall through */
4337 : case AFTER_TRIGGER_FDW_REUSE:
4338 :
4339 : /*
4340 : * Store tuple in the slot so that tg_trigtuple does not reference
4341 : * tuplestore memory. (It is formally possible for the trigger
4342 : * function to queue trigger events that add to the same
4343 : * tuplestore, which can push other tuples out of memory.) The
4344 : * distinction is academic, because we start with a minimal tuple
4345 : * that is stored as a heap tuple, constructed in different memory
4346 : * context, in the slot anyway.
4347 : */
4348 58 : LocTriggerData.tg_trigslot = trig_tuple_slot1;
4349 58 : LocTriggerData.tg_trigtuple =
4350 58 : ExecFetchSlotHeapTuple(trig_tuple_slot1, true, &should_free_trig);
4351 :
4352 58 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) ==
4353 : TRIGGER_EVENT_UPDATE)
4354 : {
4355 22 : LocTriggerData.tg_newslot = trig_tuple_slot2;
4356 22 : LocTriggerData.tg_newtuple =
4357 22 : ExecFetchSlotHeapTuple(trig_tuple_slot2, true, &should_free_new);
4358 : }
4359 : else
4360 : {
4361 36 : LocTriggerData.tg_newtuple = NULL;
4362 : }
4363 58 : break;
4364 :
4365 10812 : default:
4366 10812 : if (ItemPointerIsValid(&(event->ate_ctid1)))
4367 : {
4368 9784 : TupleTableSlot *src_slot = ExecGetTriggerOldSlot(estate,
4369 : src_relInfo);
4370 :
4371 9784 : if (!table_tuple_fetch_row_version(src_rel,
4372 : &(event->ate_ctid1),
4373 : SnapshotAny,
4374 : src_slot))
4375 0 : elog(ERROR, "failed to fetch tuple1 for AFTER trigger");
4376 :
4377 : /*
4378 : * Store the tuple fetched from the source partition into the
4379 : * target (root partitioned) table slot, converting if needed.
4380 : */
4381 9784 : if (src_relInfo != relInfo)
4382 : {
4383 144 : TupleConversionMap *map = ExecGetChildToRootMap(src_relInfo);
4384 :
4385 144 : LocTriggerData.tg_trigslot = ExecGetTriggerOldSlot(estate, relInfo);
4386 144 : if (map)
4387 : {
4388 36 : execute_attr_map_slot(map->attrMap,
4389 : src_slot,
4390 : LocTriggerData.tg_trigslot);
4391 : }
4392 : else
4393 108 : ExecCopySlot(LocTriggerData.tg_trigslot, src_slot);
4394 : }
4395 : else
4396 9640 : LocTriggerData.tg_trigslot = src_slot;
4397 9784 : LocTriggerData.tg_trigtuple =
4398 9784 : ExecFetchSlotHeapTuple(LocTriggerData.tg_trigslot, false, &should_free_trig);
4399 : }
4400 : else
4401 : {
4402 1028 : LocTriggerData.tg_trigtuple = NULL;
4403 : }
4404 :
4405 : /* don't touch ctid2 if not there */
4406 10812 : if (((event->ate_flags & AFTER_TRIGGER_TUP_BITS) == AFTER_TRIGGER_2CTID ||
4407 10956 : (event->ate_flags & AFTER_TRIGGER_CP_UPDATE)) &&
4408 2834 : ItemPointerIsValid(&(event->ate_ctid2)))
4409 2834 : {
4410 2834 : TupleTableSlot *dst_slot = ExecGetTriggerNewSlot(estate,
4411 : dst_relInfo);
4412 :
4413 2834 : if (!table_tuple_fetch_row_version(dst_rel,
4414 : &(event->ate_ctid2),
4415 : SnapshotAny,
4416 : dst_slot))
4417 0 : elog(ERROR, "failed to fetch tuple2 for AFTER trigger");
4418 :
4419 : /*
4420 : * Store the tuple fetched from the destination partition into
4421 : * the target (root partitioned) table slot, converting if
4422 : * needed.
4423 : */
4424 2834 : if (dst_relInfo != relInfo)
4425 : {
4426 144 : TupleConversionMap *map = ExecGetChildToRootMap(dst_relInfo);
4427 :
4428 144 : LocTriggerData.tg_newslot = ExecGetTriggerNewSlot(estate, relInfo);
4429 144 : if (map)
4430 : {
4431 36 : execute_attr_map_slot(map->attrMap,
4432 : dst_slot,
4433 : LocTriggerData.tg_newslot);
4434 : }
4435 : else
4436 108 : ExecCopySlot(LocTriggerData.tg_newslot, dst_slot);
4437 : }
4438 : else
4439 2690 : LocTriggerData.tg_newslot = dst_slot;
4440 2834 : LocTriggerData.tg_newtuple =
4441 2834 : ExecFetchSlotHeapTuple(LocTriggerData.tg_newslot, false, &should_free_new);
4442 : }
4443 : else
4444 : {
4445 7978 : LocTriggerData.tg_newtuple = NULL;
4446 : }
4447 : }
4448 :
4449 : /*
4450 : * Set up the tuplestore information to let the trigger have access to
4451 : * transition tables. When we first make a transition table available to
4452 : * a trigger, mark it "closed" so that it cannot change anymore. If any
4453 : * additional events of the same type get queued in the current trigger
4454 : * query level, they'll go into new transition tables.
4455 : */
4456 10870 : LocTriggerData.tg_oldtable = LocTriggerData.tg_newtable = NULL;
4457 10870 : if (evtshared->ats_table)
4458 : {
4459 534 : if (LocTriggerData.tg_trigger->tgoldtable)
4460 : {
4461 300 : if (TRIGGER_FIRED_BY_UPDATE(evtshared->ats_event))
4462 156 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_upd_tuplestore;
4463 : else
4464 144 : LocTriggerData.tg_oldtable = evtshared->ats_table->old_del_tuplestore;
4465 300 : evtshared->ats_table->closed = true;
4466 : }
4467 :
4468 534 : if (LocTriggerData.tg_trigger->tgnewtable)
4469 : {
4470 384 : if (TRIGGER_FIRED_BY_INSERT(evtshared->ats_event))
4471 210 : LocTriggerData.tg_newtable = evtshared->ats_table->new_ins_tuplestore;
4472 : else
4473 174 : LocTriggerData.tg_newtable = evtshared->ats_table->new_upd_tuplestore;
4474 384 : evtshared->ats_table->closed = true;
4475 : }
4476 : }
4477 :
4478 : /*
4479 : * Setup the remaining trigger information
4480 : */
4481 10870 : LocTriggerData.type = T_TriggerData;
4482 10870 : LocTriggerData.tg_event =
4483 10870 : evtshared->ats_event & (TRIGGER_EVENT_OPMASK | TRIGGER_EVENT_ROW);
4484 10870 : LocTriggerData.tg_relation = rel;
4485 10870 : if (TRIGGER_FOR_UPDATE(LocTriggerData.tg_trigger->tgtype))
4486 5116 : LocTriggerData.tg_updatedcols = evtshared->ats_modifiedcols;
4487 :
4488 10870 : MemoryContextReset(per_tuple_context);
4489 :
4490 : /*
4491 : * Call the trigger and throw away any possibly returned updated tuple.
4492 : * (Don't let ExecCallTriggerFunc measure EXPLAIN time.)
4493 : */
4494 10870 : rettuple = ExecCallTriggerFunc(&LocTriggerData,
4495 : tgindx,
4496 : finfo,
4497 : NULL,
4498 : per_tuple_context);
4499 9856 : if (rettuple != NULL &&
4500 3340 : rettuple != LocTriggerData.tg_trigtuple &&
4501 1410 : rettuple != LocTriggerData.tg_newtuple)
4502 0 : heap_freetuple(rettuple);
4503 :
4504 : /*
4505 : * Release resources
4506 : */
4507 9856 : if (should_free_trig)
4508 172 : heap_freetuple(LocTriggerData.tg_trigtuple);
4509 9856 : if (should_free_new)
4510 136 : heap_freetuple(LocTriggerData.tg_newtuple);
4511 :
4512 : /* don't clear slots' contents if foreign table */
4513 9856 : if (trig_tuple_slot1 == NULL)
4514 : {
4515 9786 : if (LocTriggerData.tg_trigslot)
4516 8812 : ExecClearTuple(LocTriggerData.tg_trigslot);
4517 9786 : if (LocTriggerData.tg_newslot)
4518 2608 : ExecClearTuple(LocTriggerData.tg_newslot);
4519 : }
4520 :
4521 : /*
4522 : * If doing EXPLAIN ANALYZE, stop charging time to this trigger, and count
4523 : * one "tuple returned" (really the number of firings).
4524 : */
4525 9856 : if (instr)
4526 0 : InstrStopNode(instr + tgindx, 1);
4527 : }
4528 :
4529 :
4530 : /*
4531 : * afterTriggerMarkEvents()
4532 : *
4533 : * Scan the given event list for not yet invoked events. Mark the ones
4534 : * that can be invoked now with the current firing ID.
4535 : *
4536 : * If move_list isn't NULL, events that are not to be invoked now are
4537 : * transferred to move_list.
4538 : *
4539 : * When immediate_only is true, do not invoke currently-deferred triggers.
4540 : * (This will be false only at main transaction exit.)
4541 : *
4542 : * Returns true if any invokable events were found.
4543 : */
4544 : static bool
4545 535166 : afterTriggerMarkEvents(AfterTriggerEventList *events,
4546 : AfterTriggerEventList *move_list,
4547 : bool immediate_only)
4548 : {
4549 535166 : bool found = false;
4550 535166 : bool deferred_found = false;
4551 : AfterTriggerEvent event;
4552 : AfterTriggerEventChunk *chunk;
4553 :
4554 554996 : for_each_event_chunk(event, chunk, *events)
4555 : {
4556 12422 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4557 12422 : bool defer_it = false;
4558 :
4559 12422 : if (!(event->ate_flags &
4560 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS)))
4561 : {
4562 : /*
4563 : * This trigger hasn't been called or scheduled yet. Check if we
4564 : * should call it now.
4565 : */
4566 11582 : if (immediate_only && afterTriggerCheckState(evtshared))
4567 : {
4568 536 : defer_it = true;
4569 : }
4570 : else
4571 : {
4572 : /*
4573 : * Mark it as to be fired in this firing cycle.
4574 : */
4575 11046 : evtshared->ats_firing_id = afterTriggers.firing_counter;
4576 11046 : event->ate_flags |= AFTER_TRIGGER_IN_PROGRESS;
4577 11046 : found = true;
4578 : }
4579 : }
4580 :
4581 : /*
4582 : * If it's deferred, move it to move_list, if requested.
4583 : */
4584 12422 : if (defer_it && move_list != NULL)
4585 : {
4586 536 : deferred_found = true;
4587 : /* add it to move_list */
4588 536 : afterTriggerAddEvent(move_list, event, evtshared);
4589 : /* mark original copy "done" so we don't do it again */
4590 536 : event->ate_flags |= AFTER_TRIGGER_DONE;
4591 : }
4592 : }
4593 :
4594 : /*
4595 : * We could allow deferred triggers if, before the end of the
4596 : * security-restricted operation, we were to verify that a SET CONSTRAINTS
4597 : * ... IMMEDIATE has fired all such triggers. For now, don't bother.
4598 : */
4599 535166 : if (deferred_found && InSecurityRestrictedOperation())
4600 12 : ereport(ERROR,
4601 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4602 : errmsg("cannot fire deferred trigger within security-restricted operation")));
4603 :
4604 535154 : return found;
4605 : }
4606 :
4607 : /*
4608 : * afterTriggerInvokeEvents()
4609 : *
4610 : * Scan the given event list for events that are marked as to be fired
4611 : * in the current firing cycle, and fire them.
4612 : *
4613 : * If estate isn't NULL, we use its result relation info to avoid repeated
4614 : * openings and closing of trigger target relations. If it is NULL, we
4615 : * make one locally to cache the info in case there are multiple trigger
4616 : * events per rel.
4617 : *
4618 : * When delete_ok is true, it's safe to delete fully-processed events.
4619 : * (We are not very tense about that: we simply reset a chunk to be empty
4620 : * if all its events got fired. The objective here is just to avoid useless
4621 : * rescanning of events when a trigger queues new events during transaction
4622 : * end, so it's not necessary to worry much about the case where only
4623 : * some events are fired.)
4624 : *
4625 : * Returns true if no unfired events remain in the list (this allows us
4626 : * to avoid repeating afterTriggerMarkEvents).
4627 : */
4628 : static bool
4629 7010 : afterTriggerInvokeEvents(AfterTriggerEventList *events,
4630 : CommandId firing_id,
4631 : EState *estate,
4632 : bool delete_ok)
4633 : {
4634 7010 : bool all_fired = true;
4635 : AfterTriggerEventChunk *chunk;
4636 : MemoryContext per_tuple_context;
4637 7010 : bool local_estate = false;
4638 7010 : ResultRelInfo *rInfo = NULL;
4639 7010 : Relation rel = NULL;
4640 7010 : TriggerDesc *trigdesc = NULL;
4641 7010 : FmgrInfo *finfo = NULL;
4642 7010 : Instrumentation *instr = NULL;
4643 7010 : TupleTableSlot *slot1 = NULL,
4644 7010 : *slot2 = NULL;
4645 :
4646 : /* Make a local EState if need be */
4647 7010 : if (estate == NULL)
4648 : {
4649 300 : estate = CreateExecutorState();
4650 300 : local_estate = true;
4651 : }
4652 :
4653 : /* Make a per-tuple memory context for trigger function calls */
4654 : per_tuple_context =
4655 7010 : AllocSetContextCreate(CurrentMemoryContext,
4656 : "AfterTriggerTupleContext",
4657 : ALLOCSET_DEFAULT_SIZES);
4658 :
4659 13006 : for_each_chunk(chunk, *events)
4660 : {
4661 : AfterTriggerEvent event;
4662 7010 : bool all_fired_in_chunk = true;
4663 :
4664 18354 : for_each_event(event, chunk)
4665 : {
4666 12358 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
4667 :
4668 : /*
4669 : * Is it one for me to fire?
4670 : */
4671 12358 : if ((event->ate_flags & AFTER_TRIGGER_IN_PROGRESS) &&
4672 10876 : evtshared->ats_firing_id == firing_id)
4673 9862 : {
4674 : ResultRelInfo *src_rInfo,
4675 : *dst_rInfo;
4676 :
4677 : /*
4678 : * So let's fire it... but first, find the correct relation if
4679 : * this is not the same relation as before.
4680 : */
4681 10876 : if (rel == NULL || RelationGetRelid(rel) != evtshared->ats_relid)
4682 : {
4683 7324 : rInfo = ExecGetTriggerResultRel(estate, evtshared->ats_relid,
4684 : NULL);
4685 7324 : rel = rInfo->ri_RelationDesc;
4686 : /* Catch calls with insufficient relcache refcounting */
4687 : Assert(!RelationHasReferenceCountZero(rel));
4688 7324 : trigdesc = rInfo->ri_TrigDesc;
4689 : /* caution: trigdesc could be NULL here */
4690 7324 : finfo = rInfo->ri_TrigFunctions;
4691 7324 : instr = rInfo->ri_TrigInstrument;
4692 7324 : if (slot1 != NULL)
4693 : {
4694 0 : ExecDropSingleTupleTableSlot(slot1);
4695 0 : ExecDropSingleTupleTableSlot(slot2);
4696 0 : slot1 = slot2 = NULL;
4697 : }
4698 7324 : if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
4699 : {
4700 38 : slot1 = MakeSingleTupleTableSlot(rel->rd_att,
4701 : &TTSOpsMinimalTuple);
4702 38 : slot2 = MakeSingleTupleTableSlot(rel->rd_att,
4703 : &TTSOpsMinimalTuple);
4704 : }
4705 : }
4706 :
4707 : /*
4708 : * Look up source and destination partition result rels of a
4709 : * cross-partition update event.
4710 : */
4711 10876 : if ((event->ate_flags & AFTER_TRIGGER_TUP_BITS) ==
4712 : AFTER_TRIGGER_CP_UPDATE)
4713 : {
4714 : Assert(OidIsValid(event->ate_src_part) &&
4715 : OidIsValid(event->ate_dst_part));
4716 144 : src_rInfo = ExecGetTriggerResultRel(estate,
4717 : event->ate_src_part,
4718 : rInfo);
4719 144 : dst_rInfo = ExecGetTriggerResultRel(estate,
4720 : event->ate_dst_part,
4721 : rInfo);
4722 : }
4723 : else
4724 10732 : src_rInfo = dst_rInfo = rInfo;
4725 :
4726 : /*
4727 : * Fire it. Note that the AFTER_TRIGGER_IN_PROGRESS flag is
4728 : * still set, so recursive examinations of the event list
4729 : * won't try to re-fire it.
4730 : */
4731 10876 : AfterTriggerExecute(estate, event, rInfo,
4732 : src_rInfo, dst_rInfo,
4733 : trigdesc, finfo, instr,
4734 : per_tuple_context, slot1, slot2);
4735 :
4736 : /*
4737 : * Mark the event as done.
4738 : */
4739 9862 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
4740 9862 : event->ate_flags |= AFTER_TRIGGER_DONE;
4741 : }
4742 1482 : else if (!(event->ate_flags & AFTER_TRIGGER_DONE))
4743 : {
4744 : /* something remains to be done */
4745 516 : all_fired = all_fired_in_chunk = false;
4746 : }
4747 : }
4748 :
4749 : /* Clear the chunk if delete_ok and nothing left of interest */
4750 5996 : if (delete_ok && all_fired_in_chunk)
4751 : {
4752 172 : chunk->freeptr = CHUNK_DATA_START(chunk);
4753 172 : chunk->endfree = chunk->endptr;
4754 :
4755 : /*
4756 : * If it's last chunk, must sync event list's tailfree too. Note
4757 : * that delete_ok must NOT be passed as true if there could be
4758 : * additional AfterTriggerEventList values pointing at this event
4759 : * list, since we'd fail to fix their copies of tailfree.
4760 : */
4761 172 : if (chunk == events->tail)
4762 172 : events->tailfree = chunk->freeptr;
4763 : }
4764 : }
4765 5996 : if (slot1 != NULL)
4766 : {
4767 38 : ExecDropSingleTupleTableSlot(slot1);
4768 38 : ExecDropSingleTupleTableSlot(slot2);
4769 : }
4770 :
4771 : /* Release working resources */
4772 5996 : MemoryContextDelete(per_tuple_context);
4773 :
4774 5996 : if (local_estate)
4775 : {
4776 172 : ExecCloseResultRelations(estate);
4777 172 : ExecResetTupleTable(estate->es_tupleTable, false);
4778 172 : FreeExecutorState(estate);
4779 : }
4780 :
4781 5996 : return all_fired;
4782 : }
4783 :
4784 :
4785 : /*
4786 : * GetAfterTriggersTableData
4787 : *
4788 : * Find or create an AfterTriggersTableData struct for the specified
4789 : * trigger event (relation + operation type). Ignore existing structs
4790 : * marked "closed"; we don't want to put any additional tuples into them,
4791 : * nor change their stmt-triggers-fired state.
4792 : *
4793 : * Note: the AfterTriggersTableData list is allocated in the current
4794 : * (sub)transaction's CurTransactionContext. This is OK because
4795 : * we don't need it to live past AfterTriggerEndQuery.
4796 : */
4797 : static AfterTriggersTableData *
4798 2136 : GetAfterTriggersTableData(Oid relid, CmdType cmdType)
4799 : {
4800 : AfterTriggersTableData *table;
4801 : AfterTriggersQueryData *qs;
4802 : MemoryContext oldcxt;
4803 : ListCell *lc;
4804 :
4805 : /* Caller should have ensured query_depth is OK. */
4806 : Assert(afterTriggers.query_depth >= 0 &&
4807 : afterTriggers.query_depth < afterTriggers.maxquerydepth);
4808 2136 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
4809 :
4810 2484 : foreach(lc, qs->tables)
4811 : {
4812 1408 : table = (AfterTriggersTableData *) lfirst(lc);
4813 1408 : if (table->relid == relid && table->cmdType == cmdType &&
4814 1096 : !table->closed)
4815 1060 : return table;
4816 : }
4817 :
4818 1076 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4819 :
4820 1076 : table = (AfterTriggersTableData *) palloc0(sizeof(AfterTriggersTableData));
4821 1076 : table->relid = relid;
4822 1076 : table->cmdType = cmdType;
4823 1076 : qs->tables = lappend(qs->tables, table);
4824 :
4825 1076 : MemoryContextSwitchTo(oldcxt);
4826 :
4827 1076 : return table;
4828 : }
4829 :
4830 : /*
4831 : * Returns a TupleTableSlot suitable for holding the tuples to be put
4832 : * into AfterTriggersTableData's transition table tuplestores.
4833 : */
4834 : static TupleTableSlot *
4835 294 : GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
4836 : TupleDesc tupdesc)
4837 : {
4838 : /* Create it if not already done. */
4839 294 : if (!table->storeslot)
4840 : {
4841 : MemoryContext oldcxt;
4842 :
4843 : /*
4844 : * We need this slot only until AfterTriggerEndQuery, but making it
4845 : * last till end-of-subxact is good enough. It'll be freed by
4846 : * AfterTriggerFreeQuery(). However, the passed-in tupdesc might have
4847 : * a different lifespan, so we'd better make a copy of that.
4848 : */
4849 84 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4850 84 : tupdesc = CreateTupleDescCopy(tupdesc);
4851 84 : table->storeslot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
4852 84 : MemoryContextSwitchTo(oldcxt);
4853 : }
4854 :
4855 294 : return table->storeslot;
4856 : }
4857 :
4858 : /*
4859 : * MakeTransitionCaptureState
4860 : *
4861 : * Make a TransitionCaptureState object for the given TriggerDesc, target
4862 : * relation, and operation type. The TCS object holds all the state needed
4863 : * to decide whether to capture tuples in transition tables.
4864 : *
4865 : * If there are no triggers in 'trigdesc' that request relevant transition
4866 : * tables, then return NULL.
4867 : *
4868 : * The resulting object can be passed to the ExecAR* functions. When
4869 : * dealing with child tables, the caller can set tcs_original_insert_tuple
4870 : * to avoid having to reconstruct the original tuple in the root table's
4871 : * format.
4872 : *
4873 : * Note that we copy the flags from a parent table into this struct (rather
4874 : * than subsequently using the relation's TriggerDesc directly) so that we can
4875 : * use it to control collection of transition tuples from child tables.
4876 : *
4877 : * Per SQL spec, all operations of the same kind (INSERT/UPDATE/DELETE)
4878 : * on the same table during one query should share one transition table.
4879 : * Therefore, the Tuplestores are owned by an AfterTriggersTableData struct
4880 : * looked up using the table OID + CmdType, and are merely referenced by
4881 : * the TransitionCaptureState objects we hand out to callers.
4882 : */
4883 : TransitionCaptureState *
4884 118914 : MakeTransitionCaptureState(TriggerDesc *trigdesc, Oid relid, CmdType cmdType)
4885 : {
4886 : TransitionCaptureState *state;
4887 : bool need_old_upd,
4888 : need_new_upd,
4889 : need_old_del,
4890 : need_new_ins;
4891 : AfterTriggersTableData *table;
4892 : MemoryContext oldcxt;
4893 : ResourceOwner saveResourceOwner;
4894 :
4895 118914 : if (trigdesc == NULL)
4896 106954 : return NULL;
4897 :
4898 : /* Detect which table(s) we need. */
4899 11960 : switch (cmdType)
4900 : {
4901 6706 : case CMD_INSERT:
4902 6706 : need_old_upd = need_old_del = need_new_upd = false;
4903 6706 : need_new_ins = trigdesc->trig_insert_new_table;
4904 6706 : break;
4905 3602 : case CMD_UPDATE:
4906 3602 : need_old_upd = trigdesc->trig_update_old_table;
4907 3602 : need_new_upd = trigdesc->trig_update_new_table;
4908 3602 : need_old_del = need_new_ins = false;
4909 3602 : break;
4910 1330 : case CMD_DELETE:
4911 1330 : need_old_del = trigdesc->trig_delete_old_table;
4912 1330 : need_old_upd = need_new_upd = need_new_ins = false;
4913 1330 : break;
4914 322 : case CMD_MERGE:
4915 322 : need_old_upd = trigdesc->trig_update_old_table;
4916 322 : need_new_upd = trigdesc->trig_update_new_table;
4917 322 : need_old_del = trigdesc->trig_delete_old_table;
4918 322 : need_new_ins = trigdesc->trig_insert_new_table;
4919 322 : break;
4920 0 : default:
4921 0 : elog(ERROR, "unexpected CmdType: %d", (int) cmdType);
4922 : /* keep compiler quiet */
4923 : need_old_upd = need_new_upd = need_old_del = need_new_ins = false;
4924 : break;
4925 : }
4926 11960 : if (!need_old_upd && !need_new_upd && !need_new_ins && !need_old_del)
4927 11408 : return NULL;
4928 :
4929 : /* Check state, like AfterTriggerSaveEvent. */
4930 552 : if (afterTriggers.query_depth < 0)
4931 0 : elog(ERROR, "MakeTransitionCaptureState() called outside of query");
4932 :
4933 : /* Be sure we have enough space to record events at this query depth. */
4934 552 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
4935 408 : AfterTriggerEnlargeQueryState();
4936 :
4937 : /*
4938 : * Find or create an AfterTriggersTableData struct to hold the
4939 : * tuplestore(s). If there's a matching struct but it's marked closed,
4940 : * ignore it; we need a newer one.
4941 : *
4942 : * Note: the AfterTriggersTableData list, as well as the tuplestores, are
4943 : * allocated in the current (sub)transaction's CurTransactionContext, and
4944 : * the tuplestores are managed by the (sub)transaction's resource owner.
4945 : * This is sufficient lifespan because we do not allow triggers using
4946 : * transition tables to be deferrable; they will be fired during
4947 : * AfterTriggerEndQuery, after which it's okay to delete the data.
4948 : */
4949 552 : table = GetAfterTriggersTableData(relid, cmdType);
4950 :
4951 : /* Now create required tuplestore(s), if we don't have them already. */
4952 552 : oldcxt = MemoryContextSwitchTo(CurTransactionContext);
4953 552 : saveResourceOwner = CurrentResourceOwner;
4954 552 : CurrentResourceOwner = CurTransactionResourceOwner;
4955 :
4956 552 : if (need_old_upd && table->old_upd_tuplestore == NULL)
4957 162 : table->old_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4958 552 : if (need_new_upd && table->new_upd_tuplestore == NULL)
4959 174 : table->new_upd_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4960 552 : if (need_old_del && table->old_del_tuplestore == NULL)
4961 132 : table->old_del_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4962 552 : if (need_new_ins && table->new_ins_tuplestore == NULL)
4963 210 : table->new_ins_tuplestore = tuplestore_begin_heap(false, false, work_mem);
4964 :
4965 552 : CurrentResourceOwner = saveResourceOwner;
4966 552 : MemoryContextSwitchTo(oldcxt);
4967 :
4968 : /* Now build the TransitionCaptureState struct, in caller's context */
4969 552 : state = (TransitionCaptureState *) palloc0(sizeof(TransitionCaptureState));
4970 552 : state->tcs_delete_old_table = trigdesc->trig_delete_old_table;
4971 552 : state->tcs_update_old_table = trigdesc->trig_update_old_table;
4972 552 : state->tcs_update_new_table = trigdesc->trig_update_new_table;
4973 552 : state->tcs_insert_new_table = trigdesc->trig_insert_new_table;
4974 552 : state->tcs_private = table;
4975 :
4976 552 : return state;
4977 : }
4978 :
4979 :
4980 : /* ----------
4981 : * AfterTriggerBeginXact()
4982 : *
4983 : * Called at transaction start (either BEGIN or implicit for single
4984 : * statement outside of transaction block).
4985 : * ----------
4986 : */
4987 : void
4988 560488 : AfterTriggerBeginXact(void)
4989 : {
4990 : /*
4991 : * Initialize after-trigger state structure to empty
4992 : */
4993 560488 : afterTriggers.firing_counter = (CommandId) 1; /* mustn't be 0 */
4994 560488 : afterTriggers.query_depth = -1;
4995 :
4996 : /*
4997 : * Verify that there is no leftover state remaining. If these assertions
4998 : * trip, it means that AfterTriggerEndXact wasn't called or didn't clean
4999 : * up properly.
5000 : */
5001 : Assert(afterTriggers.state == NULL);
5002 : Assert(afterTriggers.query_stack == NULL);
5003 : Assert(afterTriggers.maxquerydepth == 0);
5004 : Assert(afterTriggers.event_cxt == NULL);
5005 : Assert(afterTriggers.events.head == NULL);
5006 : Assert(afterTriggers.trans_stack == NULL);
5007 : Assert(afterTriggers.maxtransdepth == 0);
5008 560488 : }
5009 :
5010 :
5011 : /* ----------
5012 : * AfterTriggerBeginQuery()
5013 : *
5014 : * Called just before we start processing a single query within a
5015 : * transaction (or subtransaction). Most of the real work gets deferred
5016 : * until somebody actually tries to queue a trigger event.
5017 : * ----------
5018 : */
5019 : void
5020 416434 : AfterTriggerBeginQuery(void)
5021 : {
5022 : /* Increase the query stack depth */
5023 416434 : afterTriggers.query_depth++;
5024 416434 : }
5025 :
5026 :
5027 : /* ----------
5028 : * AfterTriggerEndQuery()
5029 : *
5030 : * Called after one query has been completely processed. At this time
5031 : * we invoke all AFTER IMMEDIATE trigger events queued by the query, and
5032 : * transfer deferred trigger events to the global deferred-trigger list.
5033 : *
5034 : * Note that this must be called BEFORE closing down the executor
5035 : * with ExecutorEnd, because we make use of the EState's info about
5036 : * target relations. Normally it is called from ExecutorFinish.
5037 : * ----------
5038 : */
5039 : void
5040 412014 : AfterTriggerEndQuery(EState *estate)
5041 : {
5042 : AfterTriggersQueryData *qs;
5043 :
5044 : /* Must be inside a query, too */
5045 : Assert(afterTriggers.query_depth >= 0);
5046 :
5047 : /*
5048 : * If we never even got as far as initializing the event stack, there
5049 : * certainly won't be any events, so exit quickly.
5050 : */
5051 412014 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
5052 : {
5053 403818 : afterTriggers.query_depth--;
5054 403818 : return;
5055 : }
5056 :
5057 : /*
5058 : * Process all immediate-mode triggers queued by the query, and move the
5059 : * deferred ones to the main list of deferred events.
5060 : *
5061 : * Notice that we decide which ones will be fired, and put the deferred
5062 : * ones on the main list, before anything is actually fired. This ensures
5063 : * reasonably sane behavior if a trigger function does SET CONSTRAINTS ...
5064 : * IMMEDIATE: all events we have decided to defer will be available for it
5065 : * to fire.
5066 : *
5067 : * We loop in case a trigger queues more events at the same query level.
5068 : * Ordinary trigger functions, including all PL/pgSQL trigger functions,
5069 : * will instead fire any triggers in a dedicated query level. Foreign key
5070 : * enforcement triggers do add to the current query level, thanks to their
5071 : * passing fire_triggers = false to SPI_execute_snapshot(). Other
5072 : * C-language triggers might do likewise.
5073 : *
5074 : * If we find no firable events, we don't have to increment
5075 : * firing_counter.
5076 : */
5077 8196 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5078 :
5079 : for (;;)
5080 : {
5081 8502 : if (afterTriggerMarkEvents(&qs->events, &afterTriggers.events, true))
5082 : {
5083 6710 : CommandId firing_id = afterTriggers.firing_counter++;
5084 6710 : AfterTriggerEventChunk *oldtail = qs->events.tail;
5085 :
5086 6710 : if (afterTriggerInvokeEvents(&qs->events, firing_id, estate, false))
5087 5518 : break; /* all fired */
5088 :
5089 : /*
5090 : * Firing a trigger could result in query_stack being repalloc'd,
5091 : * so we must recalculate qs after each afterTriggerInvokeEvents
5092 : * call. Furthermore, it's unsafe to pass delete_ok = true here,
5093 : * because that could cause afterTriggerInvokeEvents to try to
5094 : * access qs->events after the stack has been repalloc'd.
5095 : */
5096 306 : qs = &afterTriggers.query_stack[afterTriggers.query_depth];
5097 :
5098 : /*
5099 : * We'll need to scan the events list again. To reduce the cost
5100 : * of doing so, get rid of completely-fired chunks. We know that
5101 : * all events were marked IN_PROGRESS or DONE at the conclusion of
5102 : * afterTriggerMarkEvents, so any still-interesting events must
5103 : * have been added after that, and so must be in the chunk that
5104 : * was then the tail chunk, or in later chunks. So, zap all
5105 : * chunks before oldtail. This is approximately the same set of
5106 : * events we would have gotten rid of by passing delete_ok = true.
5107 : */
5108 : Assert(oldtail != NULL);
5109 306 : while (qs->events.head != oldtail)
5110 0 : afterTriggerDeleteHeadEventChunk(qs);
5111 : }
5112 : else
5113 1780 : break;
5114 : }
5115 :
5116 : /* Release query-level-local storage, including tuplestores if any */
5117 7298 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5118 :
5119 7298 : afterTriggers.query_depth--;
5120 : }
5121 :
5122 :
5123 : /*
5124 : * AfterTriggerFreeQuery
5125 : * Release subsidiary storage for a trigger query level.
5126 : * This includes closing down tuplestores.
5127 : * Note: it's important for this to be safe if interrupted by an error
5128 : * and then called again for the same query level.
5129 : */
5130 : static void
5131 7328 : AfterTriggerFreeQuery(AfterTriggersQueryData *qs)
5132 : {
5133 : Tuplestorestate *ts;
5134 : List *tables;
5135 : ListCell *lc;
5136 :
5137 : /* Drop the trigger events */
5138 7328 : afterTriggerFreeEventList(&qs->events);
5139 :
5140 : /* Drop FDW tuplestore if any */
5141 7328 : ts = qs->fdw_tuplestore;
5142 7328 : qs->fdw_tuplestore = NULL;
5143 7328 : if (ts)
5144 36 : tuplestore_end(ts);
5145 :
5146 : /* Release per-table subsidiary storage */
5147 7328 : tables = qs->tables;
5148 8352 : foreach(lc, tables)
5149 : {
5150 1024 : AfterTriggersTableData *table = (AfterTriggersTableData *) lfirst(lc);
5151 :
5152 1024 : ts = table->old_upd_tuplestore;
5153 1024 : table->old_upd_tuplestore = NULL;
5154 1024 : if (ts)
5155 150 : tuplestore_end(ts);
5156 1024 : ts = table->new_upd_tuplestore;
5157 1024 : table->new_upd_tuplestore = NULL;
5158 1024 : if (ts)
5159 156 : tuplestore_end(ts);
5160 1024 : ts = table->old_del_tuplestore;
5161 1024 : table->old_del_tuplestore = NULL;
5162 1024 : if (ts)
5163 120 : tuplestore_end(ts);
5164 1024 : ts = table->new_ins_tuplestore;
5165 1024 : table->new_ins_tuplestore = NULL;
5166 1024 : if (ts)
5167 204 : tuplestore_end(ts);
5168 1024 : if (table->storeslot)
5169 : {
5170 84 : TupleTableSlot *slot = table->storeslot;
5171 :
5172 84 : table->storeslot = NULL;
5173 84 : ExecDropSingleTupleTableSlot(slot);
5174 : }
5175 : }
5176 :
5177 : /*
5178 : * Now free the AfterTriggersTableData structs and list cells. Reset list
5179 : * pointer first; if list_free_deep somehow gets an error, better to leak
5180 : * that storage than have an infinite loop.
5181 : */
5182 7328 : qs->tables = NIL;
5183 7328 : list_free_deep(tables);
5184 7328 : }
5185 :
5186 :
5187 : /* ----------
5188 : * AfterTriggerFireDeferred()
5189 : *
5190 : * Called just before the current transaction is committed. At this
5191 : * time we invoke all pending DEFERRED triggers.
5192 : *
5193 : * It is possible for other modules to queue additional deferred triggers
5194 : * during pre-commit processing; therefore xact.c may have to call this
5195 : * multiple times.
5196 : * ----------
5197 : */
5198 : void
5199 526630 : AfterTriggerFireDeferred(void)
5200 : {
5201 : AfterTriggerEventList *events;
5202 526630 : bool snap_pushed = false;
5203 :
5204 : /* Must not be inside a query */
5205 : Assert(afterTriggers.query_depth == -1);
5206 :
5207 : /*
5208 : * If there are any triggers to fire, make sure we have set a snapshot for
5209 : * them to use. (Since PortalRunUtility doesn't set a snap for COMMIT, we
5210 : * can't assume ActiveSnapshot is valid on entry.)
5211 : */
5212 526630 : events = &afterTriggers.events;
5213 526630 : if (events->head != NULL)
5214 : {
5215 284 : PushActiveSnapshot(GetTransactionSnapshot());
5216 284 : snap_pushed = true;
5217 : }
5218 :
5219 : /*
5220 : * Run all the remaining triggers. Loop until they are all gone, in case
5221 : * some trigger queues more for us to do.
5222 : */
5223 526630 : while (afterTriggerMarkEvents(events, NULL, false))
5224 : {
5225 284 : CommandId firing_id = afterTriggers.firing_counter++;
5226 :
5227 284 : if (afterTriggerInvokeEvents(events, firing_id, NULL, true))
5228 172 : break; /* all fired */
5229 : }
5230 :
5231 : /*
5232 : * We don't bother freeing the event list, since it will go away anyway
5233 : * (and more efficiently than via pfree) in AfterTriggerEndXact.
5234 : */
5235 :
5236 526518 : if (snap_pushed)
5237 172 : PopActiveSnapshot();
5238 526518 : }
5239 :
5240 :
5241 : /* ----------
5242 : * AfterTriggerEndXact()
5243 : *
5244 : * The current transaction is finishing.
5245 : *
5246 : * Any unfired triggers are canceled so we simply throw
5247 : * away anything we know.
5248 : *
5249 : * Note: it is possible for this to be called repeatedly in case of
5250 : * error during transaction abort; therefore, do not complain if
5251 : * already closed down.
5252 : * ----------
5253 : */
5254 : void
5255 560898 : AfterTriggerEndXact(bool isCommit)
5256 : {
5257 : /*
5258 : * Forget the pending-events list.
5259 : *
5260 : * Since all the info is in TopTransactionContext or children thereof, we
5261 : * don't really need to do anything to reclaim memory. However, the
5262 : * pending-events list could be large, and so it's useful to discard it as
5263 : * soon as possible --- especially if we are aborting because we ran out
5264 : * of memory for the list!
5265 : */
5266 560898 : if (afterTriggers.event_cxt)
5267 : {
5268 6020 : MemoryContextDelete(afterTriggers.event_cxt);
5269 6020 : afterTriggers.event_cxt = NULL;
5270 6020 : afterTriggers.events.head = NULL;
5271 6020 : afterTriggers.events.tail = NULL;
5272 6020 : afterTriggers.events.tailfree = NULL;
5273 : }
5274 :
5275 : /*
5276 : * Forget any subtransaction state as well. Since this can't be very
5277 : * large, we let the eventual reset of TopTransactionContext free the
5278 : * memory instead of doing it here.
5279 : */
5280 560898 : afterTriggers.trans_stack = NULL;
5281 560898 : afterTriggers.maxtransdepth = 0;
5282 :
5283 :
5284 : /*
5285 : * Forget the query stack and constraint-related state information. As
5286 : * with the subtransaction state information, we don't bother freeing the
5287 : * memory here.
5288 : */
5289 560898 : afterTriggers.query_stack = NULL;
5290 560898 : afterTriggers.maxquerydepth = 0;
5291 560898 : afterTriggers.state = NULL;
5292 :
5293 : /* No more afterTriggers manipulation until next transaction starts. */
5294 560898 : afterTriggers.query_depth = -1;
5295 560898 : }
5296 :
5297 : /*
5298 : * AfterTriggerBeginSubXact()
5299 : *
5300 : * Start a subtransaction.
5301 : */
5302 : void
5303 18112 : AfterTriggerBeginSubXact(void)
5304 : {
5305 18112 : int my_level = GetCurrentTransactionNestLevel();
5306 :
5307 : /*
5308 : * Allocate more space in the trans_stack if needed. (Note: because the
5309 : * minimum nest level of a subtransaction is 2, we waste the first couple
5310 : * entries of the array; not worth the notational effort to avoid it.)
5311 : */
5312 20908 : while (my_level >= afterTriggers.maxtransdepth)
5313 : {
5314 2796 : if (afterTriggers.maxtransdepth == 0)
5315 : {
5316 : /* Arbitrarily initialize for max of 8 subtransaction levels */
5317 2712 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5318 2712 : MemoryContextAlloc(TopTransactionContext,
5319 : 8 * sizeof(AfterTriggersTransData));
5320 2712 : afterTriggers.maxtransdepth = 8;
5321 : }
5322 : else
5323 : {
5324 : /* repalloc will keep the stack in the same context */
5325 84 : int new_alloc = afterTriggers.maxtransdepth * 2;
5326 :
5327 84 : afterTriggers.trans_stack = (AfterTriggersTransData *)
5328 84 : repalloc(afterTriggers.trans_stack,
5329 : new_alloc * sizeof(AfterTriggersTransData));
5330 84 : afterTriggers.maxtransdepth = new_alloc;
5331 : }
5332 : }
5333 :
5334 : /*
5335 : * Push the current information into the stack. The SET CONSTRAINTS state
5336 : * is not saved until/unless changed. Likewise, we don't make a
5337 : * per-subtransaction event context until needed.
5338 : */
5339 18112 : afterTriggers.trans_stack[my_level].state = NULL;
5340 18112 : afterTriggers.trans_stack[my_level].events = afterTriggers.events;
5341 18112 : afterTriggers.trans_stack[my_level].query_depth = afterTriggers.query_depth;
5342 18112 : afterTriggers.trans_stack[my_level].firing_counter = afterTriggers.firing_counter;
5343 18112 : }
5344 :
5345 : /*
5346 : * AfterTriggerEndSubXact()
5347 : *
5348 : * The current subtransaction is ending.
5349 : */
5350 : void
5351 18112 : AfterTriggerEndSubXact(bool isCommit)
5352 : {
5353 18112 : int my_level = GetCurrentTransactionNestLevel();
5354 : SetConstraintState state;
5355 : AfterTriggerEvent event;
5356 : AfterTriggerEventChunk *chunk;
5357 : CommandId subxact_firing_id;
5358 :
5359 : /*
5360 : * Pop the prior state if needed.
5361 : */
5362 18112 : if (isCommit)
5363 : {
5364 : Assert(my_level < afterTriggers.maxtransdepth);
5365 : /* If we saved a prior state, we don't need it anymore */
5366 8912 : state = afterTriggers.trans_stack[my_level].state;
5367 8912 : if (state != NULL)
5368 6 : pfree(state);
5369 : /* this avoids double pfree if error later: */
5370 8912 : afterTriggers.trans_stack[my_level].state = NULL;
5371 : Assert(afterTriggers.query_depth ==
5372 : afterTriggers.trans_stack[my_level].query_depth);
5373 : }
5374 : else
5375 : {
5376 : /*
5377 : * Aborting. It is possible subxact start failed before calling
5378 : * AfterTriggerBeginSubXact, in which case we mustn't risk touching
5379 : * trans_stack levels that aren't there.
5380 : */
5381 9200 : if (my_level >= afterTriggers.maxtransdepth)
5382 0 : return;
5383 :
5384 : /*
5385 : * Release query-level storage for queries being aborted, and restore
5386 : * query_depth to its pre-subxact value. This assumes that a
5387 : * subtransaction will not add events to query levels started in a
5388 : * earlier transaction state.
5389 : */
5390 9290 : while (afterTriggers.query_depth > afterTriggers.trans_stack[my_level].query_depth)
5391 : {
5392 90 : if (afterTriggers.query_depth < afterTriggers.maxquerydepth)
5393 30 : AfterTriggerFreeQuery(&afterTriggers.query_stack[afterTriggers.query_depth]);
5394 90 : afterTriggers.query_depth--;
5395 : }
5396 : Assert(afterTriggers.query_depth ==
5397 : afterTriggers.trans_stack[my_level].query_depth);
5398 :
5399 : /*
5400 : * Restore the global deferred-event list to its former length,
5401 : * discarding any events queued by the subxact.
5402 : */
5403 9200 : afterTriggerRestoreEventList(&afterTriggers.events,
5404 9200 : &afterTriggers.trans_stack[my_level].events);
5405 :
5406 : /*
5407 : * Restore the trigger state. If the saved state is NULL, then this
5408 : * subxact didn't save it, so it doesn't need restoring.
5409 : */
5410 9200 : state = afterTriggers.trans_stack[my_level].state;
5411 9200 : if (state != NULL)
5412 : {
5413 4 : pfree(afterTriggers.state);
5414 4 : afterTriggers.state = state;
5415 : }
5416 : /* this avoids double pfree if error later: */
5417 9200 : afterTriggers.trans_stack[my_level].state = NULL;
5418 :
5419 : /*
5420 : * Scan for any remaining deferred events that were marked DONE or IN
5421 : * PROGRESS by this subxact or a child, and un-mark them. We can
5422 : * recognize such events because they have a firing ID greater than or
5423 : * equal to the firing_counter value we saved at subtransaction start.
5424 : * (This essentially assumes that the current subxact includes all
5425 : * subxacts started after it.)
5426 : */
5427 9200 : subxact_firing_id = afterTriggers.trans_stack[my_level].firing_counter;
5428 9244 : for_each_event_chunk(event, chunk, afterTriggers.events)
5429 : {
5430 22 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
5431 :
5432 22 : if (event->ate_flags &
5433 : (AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS))
5434 : {
5435 4 : if (evtshared->ats_firing_id >= subxact_firing_id)
5436 4 : event->ate_flags &=
5437 : ~(AFTER_TRIGGER_DONE | AFTER_TRIGGER_IN_PROGRESS);
5438 : }
5439 : }
5440 : }
5441 : }
5442 :
5443 : /*
5444 : * Get the transition table for the given event and depending on whether we are
5445 : * processing the old or the new tuple.
5446 : */
5447 : static Tuplestorestate *
5448 66084 : GetAfterTriggersTransitionTable(int event,
5449 : TupleTableSlot *oldslot,
5450 : TupleTableSlot *newslot,
5451 : TransitionCaptureState *transition_capture)
5452 : {
5453 66084 : Tuplestorestate *tuplestore = NULL;
5454 66084 : bool delete_old_table = transition_capture->tcs_delete_old_table;
5455 66084 : bool update_old_table = transition_capture->tcs_update_old_table;
5456 66084 : bool update_new_table = transition_capture->tcs_update_new_table;
5457 66084 : bool insert_new_table = transition_capture->tcs_insert_new_table;
5458 :
5459 : /*
5460 : * For INSERT events NEW should be non-NULL, for DELETE events OLD should
5461 : * be non-NULL, whereas for UPDATE events normally both OLD and NEW are
5462 : * non-NULL. But for UPDATE events fired for capturing transition tuples
5463 : * during UPDATE partition-key row movement, OLD is NULL when the event is
5464 : * for a row being inserted, whereas NEW is NULL when the event is for a
5465 : * row being deleted.
5466 : */
5467 : Assert(!(event == TRIGGER_EVENT_DELETE && delete_old_table &&
5468 : TupIsNull(oldslot)));
5469 : Assert(!(event == TRIGGER_EVENT_INSERT && insert_new_table &&
5470 : TupIsNull(newslot)));
5471 :
5472 66084 : if (!TupIsNull(oldslot))
5473 : {
5474 : Assert(TupIsNull(newslot));
5475 5394 : if (event == TRIGGER_EVENT_DELETE && delete_old_table)
5476 5040 : tuplestore = transition_capture->tcs_private->old_del_tuplestore;
5477 354 : else if (event == TRIGGER_EVENT_UPDATE && update_old_table)
5478 330 : tuplestore = transition_capture->tcs_private->old_upd_tuplestore;
5479 : }
5480 60690 : else if (!TupIsNull(newslot))
5481 : {
5482 : Assert(TupIsNull(oldslot));
5483 60690 : if (event == TRIGGER_EVENT_INSERT && insert_new_table)
5484 60336 : tuplestore = transition_capture->tcs_private->new_ins_tuplestore;
5485 354 : else if (event == TRIGGER_EVENT_UPDATE && update_new_table)
5486 348 : tuplestore = transition_capture->tcs_private->new_upd_tuplestore;
5487 : }
5488 :
5489 66084 : return tuplestore;
5490 : }
5491 :
5492 : /*
5493 : * Add the given heap tuple to the given tuplestore, applying the conversion
5494 : * map if necessary.
5495 : *
5496 : * If original_insert_tuple is given, we can add that tuple without conversion.
5497 : */
5498 : static void
5499 66084 : TransitionTableAddTuple(EState *estate,
5500 : TransitionCaptureState *transition_capture,
5501 : ResultRelInfo *relinfo,
5502 : TupleTableSlot *slot,
5503 : TupleTableSlot *original_insert_tuple,
5504 : Tuplestorestate *tuplestore)
5505 : {
5506 : TupleConversionMap *map;
5507 :
5508 : /*
5509 : * Nothing needs to be done if we don't have a tuplestore.
5510 : */
5511 66084 : if (tuplestore == NULL)
5512 30 : return;
5513 :
5514 66054 : if (original_insert_tuple)
5515 126 : tuplestore_puttupleslot(tuplestore, original_insert_tuple);
5516 65928 : else if ((map = ExecGetChildToRootMap(relinfo)) != NULL)
5517 : {
5518 294 : AfterTriggersTableData *table = transition_capture->tcs_private;
5519 : TupleTableSlot *storeslot;
5520 :
5521 294 : storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
5522 294 : execute_attr_map_slot(map->attrMap, slot, storeslot);
5523 294 : tuplestore_puttupleslot(tuplestore, storeslot);
5524 : }
5525 : else
5526 65634 : tuplestore_puttupleslot(tuplestore, slot);
5527 : }
5528 :
5529 : /* ----------
5530 : * AfterTriggerEnlargeQueryState()
5531 : *
5532 : * Prepare the necessary state so that we can record AFTER trigger events
5533 : * queued by a query. It is allowed to have nested queries within a
5534 : * (sub)transaction, so we need to have separate state for each query
5535 : * nesting level.
5536 : * ----------
5537 : */
5538 : static void
5539 6344 : AfterTriggerEnlargeQueryState(void)
5540 : {
5541 6344 : int init_depth = afterTriggers.maxquerydepth;
5542 :
5543 : Assert(afterTriggers.query_depth >= afterTriggers.maxquerydepth);
5544 :
5545 6344 : if (afterTriggers.maxquerydepth == 0)
5546 : {
5547 6344 : int new_alloc = Max(afterTriggers.query_depth + 1, 8);
5548 :
5549 6344 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5550 6344 : MemoryContextAlloc(TopTransactionContext,
5551 : new_alloc * sizeof(AfterTriggersQueryData));
5552 6344 : afterTriggers.maxquerydepth = new_alloc;
5553 : }
5554 : else
5555 : {
5556 : /* repalloc will keep the stack in the same context */
5557 0 : int old_alloc = afterTriggers.maxquerydepth;
5558 0 : int new_alloc = Max(afterTriggers.query_depth + 1,
5559 : old_alloc * 2);
5560 :
5561 0 : afterTriggers.query_stack = (AfterTriggersQueryData *)
5562 0 : repalloc(afterTriggers.query_stack,
5563 : new_alloc * sizeof(AfterTriggersQueryData));
5564 0 : afterTriggers.maxquerydepth = new_alloc;
5565 : }
5566 :
5567 : /* Initialize new array entries to empty */
5568 57096 : while (init_depth < afterTriggers.maxquerydepth)
5569 : {
5570 50752 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[init_depth];
5571 :
5572 50752 : qs->events.head = NULL;
5573 50752 : qs->events.tail = NULL;
5574 50752 : qs->events.tailfree = NULL;
5575 50752 : qs->fdw_tuplestore = NULL;
5576 50752 : qs->tables = NIL;
5577 :
5578 50752 : ++init_depth;
5579 : }
5580 6344 : }
5581 :
5582 : /*
5583 : * Create an empty SetConstraintState with room for numalloc trigstates
5584 : */
5585 : static SetConstraintState
5586 96 : SetConstraintStateCreate(int numalloc)
5587 : {
5588 : SetConstraintState state;
5589 :
5590 : /* Behave sanely with numalloc == 0 */
5591 96 : if (numalloc <= 0)
5592 10 : numalloc = 1;
5593 :
5594 : /*
5595 : * We assume that zeroing will correctly initialize the state values.
5596 : */
5597 : state = (SetConstraintState)
5598 96 : MemoryContextAllocZero(TopTransactionContext,
5599 : offsetof(SetConstraintStateData, trigstates) +
5600 96 : numalloc * sizeof(SetConstraintTriggerData));
5601 :
5602 96 : state->numalloc = numalloc;
5603 :
5604 96 : return state;
5605 : }
5606 :
5607 : /*
5608 : * Copy a SetConstraintState
5609 : */
5610 : static SetConstraintState
5611 10 : SetConstraintStateCopy(SetConstraintState origstate)
5612 : {
5613 : SetConstraintState state;
5614 :
5615 10 : state = SetConstraintStateCreate(origstate->numstates);
5616 :
5617 10 : state->all_isset = origstate->all_isset;
5618 10 : state->all_isdeferred = origstate->all_isdeferred;
5619 10 : state->numstates = origstate->numstates;
5620 10 : memcpy(state->trigstates, origstate->trigstates,
5621 10 : origstate->numstates * sizeof(SetConstraintTriggerData));
5622 :
5623 10 : return state;
5624 : }
5625 :
5626 : /*
5627 : * Add a per-trigger item to a SetConstraintState. Returns possibly-changed
5628 : * pointer to the state object (it will change if we have to repalloc).
5629 : */
5630 : static SetConstraintState
5631 342 : SetConstraintStateAddItem(SetConstraintState state,
5632 : Oid tgoid, bool tgisdeferred)
5633 : {
5634 342 : if (state->numstates >= state->numalloc)
5635 : {
5636 30 : int newalloc = state->numalloc * 2;
5637 :
5638 30 : newalloc = Max(newalloc, 8); /* in case original has size 0 */
5639 : state = (SetConstraintState)
5640 30 : repalloc(state,
5641 : offsetof(SetConstraintStateData, trigstates) +
5642 30 : newalloc * sizeof(SetConstraintTriggerData));
5643 30 : state->numalloc = newalloc;
5644 : Assert(state->numstates < state->numalloc);
5645 : }
5646 :
5647 342 : state->trigstates[state->numstates].sct_tgoid = tgoid;
5648 342 : state->trigstates[state->numstates].sct_tgisdeferred = tgisdeferred;
5649 342 : state->numstates++;
5650 :
5651 342 : return state;
5652 : }
5653 :
5654 : /* ----------
5655 : * AfterTriggerSetState()
5656 : *
5657 : * Execute the SET CONSTRAINTS ... utility command.
5658 : * ----------
5659 : */
5660 : void
5661 102 : AfterTriggerSetState(ConstraintsSetStmt *stmt)
5662 : {
5663 102 : int my_level = GetCurrentTransactionNestLevel();
5664 :
5665 : /* If we haven't already done so, initialize our state. */
5666 102 : if (afterTriggers.state == NULL)
5667 86 : afterTriggers.state = SetConstraintStateCreate(8);
5668 :
5669 : /*
5670 : * If in a subtransaction, and we didn't save the current state already,
5671 : * save it so it can be restored if the subtransaction aborts.
5672 : */
5673 102 : if (my_level > 1 &&
5674 10 : afterTriggers.trans_stack[my_level].state == NULL)
5675 : {
5676 10 : afterTriggers.trans_stack[my_level].state =
5677 10 : SetConstraintStateCopy(afterTriggers.state);
5678 : }
5679 :
5680 : /*
5681 : * Handle SET CONSTRAINTS ALL ...
5682 : */
5683 102 : if (stmt->constraints == NIL)
5684 : {
5685 : /*
5686 : * Forget any previous SET CONSTRAINTS commands in this transaction.
5687 : */
5688 54 : afterTriggers.state->numstates = 0;
5689 :
5690 : /*
5691 : * Set the per-transaction ALL state to known.
5692 : */
5693 54 : afterTriggers.state->all_isset = true;
5694 54 : afterTriggers.state->all_isdeferred = stmt->deferred;
5695 : }
5696 : else
5697 : {
5698 : Relation conrel;
5699 : Relation tgrel;
5700 48 : List *conoidlist = NIL;
5701 48 : List *tgoidlist = NIL;
5702 : ListCell *lc;
5703 :
5704 : /*
5705 : * Handle SET CONSTRAINTS constraint-name [, ...]
5706 : *
5707 : * First, identify all the named constraints and make a list of their
5708 : * OIDs. Since, unlike the SQL spec, we allow multiple constraints of
5709 : * the same name within a schema, the specifications are not
5710 : * necessarily unique. Our strategy is to target all matching
5711 : * constraints within the first search-path schema that has any
5712 : * matches, but disregard matches in schemas beyond the first match.
5713 : * (This is a bit odd but it's the historical behavior.)
5714 : *
5715 : * A constraint in a partitioned table may have corresponding
5716 : * constraints in the partitions. Grab those too.
5717 : */
5718 48 : conrel = table_open(ConstraintRelationId, AccessShareLock);
5719 :
5720 96 : foreach(lc, stmt->constraints)
5721 : {
5722 48 : RangeVar *constraint = lfirst(lc);
5723 : bool found;
5724 : List *namespacelist;
5725 : ListCell *nslc;
5726 :
5727 48 : if (constraint->catalogname)
5728 : {
5729 0 : if (strcmp(constraint->catalogname, get_database_name(MyDatabaseId)) != 0)
5730 0 : ereport(ERROR,
5731 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
5732 : errmsg("cross-database references are not implemented: \"%s.%s.%s\"",
5733 : constraint->catalogname, constraint->schemaname,
5734 : constraint->relname)));
5735 : }
5736 :
5737 : /*
5738 : * If we're given the schema name with the constraint, look only
5739 : * in that schema. If given a bare constraint name, use the
5740 : * search path to find the first matching constraint.
5741 : */
5742 48 : if (constraint->schemaname)
5743 : {
5744 12 : Oid namespaceId = LookupExplicitNamespace(constraint->schemaname,
5745 : false);
5746 :
5747 12 : namespacelist = list_make1_oid(namespaceId);
5748 : }
5749 : else
5750 : {
5751 36 : namespacelist = fetch_search_path(true);
5752 : }
5753 :
5754 48 : found = false;
5755 120 : foreach(nslc, namespacelist)
5756 : {
5757 120 : Oid namespaceId = lfirst_oid(nslc);
5758 : SysScanDesc conscan;
5759 : ScanKeyData skey[2];
5760 : HeapTuple tup;
5761 :
5762 120 : ScanKeyInit(&skey[0],
5763 : Anum_pg_constraint_conname,
5764 : BTEqualStrategyNumber, F_NAMEEQ,
5765 120 : CStringGetDatum(constraint->relname));
5766 120 : ScanKeyInit(&skey[1],
5767 : Anum_pg_constraint_connamespace,
5768 : BTEqualStrategyNumber, F_OIDEQ,
5769 : ObjectIdGetDatum(namespaceId));
5770 :
5771 120 : conscan = systable_beginscan(conrel, ConstraintNameNspIndexId,
5772 : true, NULL, 2, skey);
5773 :
5774 216 : while (HeapTupleIsValid(tup = systable_getnext(conscan)))
5775 : {
5776 96 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);
5777 :
5778 96 : if (con->condeferrable)
5779 96 : conoidlist = lappend_oid(conoidlist, con->oid);
5780 0 : else if (stmt->deferred)
5781 0 : ereport(ERROR,
5782 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
5783 : errmsg("constraint \"%s\" is not deferrable",
5784 : constraint->relname)));
5785 96 : found = true;
5786 : }
5787 :
5788 120 : systable_endscan(conscan);
5789 :
5790 : /*
5791 : * Once we've found a matching constraint we do not search
5792 : * later parts of the search path.
5793 : */
5794 120 : if (found)
5795 48 : break;
5796 : }
5797 :
5798 48 : list_free(namespacelist);
5799 :
5800 : /*
5801 : * Not found ?
5802 : */
5803 48 : if (!found)
5804 0 : ereport(ERROR,
5805 : (errcode(ERRCODE_UNDEFINED_OBJECT),
5806 : errmsg("constraint \"%s\" does not exist",
5807 : constraint->relname)));
5808 : }
5809 :
5810 : /*
5811 : * Scan for any possible descendants of the constraints. We append
5812 : * whatever we find to the same list that we're scanning; this has the
5813 : * effect that we create new scans for those, too, so if there are
5814 : * further descendents, we'll also catch them.
5815 : */
5816 258 : foreach(lc, conoidlist)
5817 : {
5818 210 : Oid parent = lfirst_oid(lc);
5819 : ScanKeyData key;
5820 : SysScanDesc scan;
5821 : HeapTuple tuple;
5822 :
5823 210 : ScanKeyInit(&key,
5824 : Anum_pg_constraint_conparentid,
5825 : BTEqualStrategyNumber, F_OIDEQ,
5826 : ObjectIdGetDatum(parent));
5827 :
5828 210 : scan = systable_beginscan(conrel, ConstraintParentIndexId, true, NULL, 1, &key);
5829 :
5830 324 : while (HeapTupleIsValid(tuple = systable_getnext(scan)))
5831 : {
5832 114 : Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);
5833 :
5834 114 : conoidlist = lappend_oid(conoidlist, con->oid);
5835 : }
5836 :
5837 210 : systable_endscan(scan);
5838 : }
5839 :
5840 48 : table_close(conrel, AccessShareLock);
5841 :
5842 : /*
5843 : * Now, locate the trigger(s) implementing each of these constraints,
5844 : * and make a list of their OIDs.
5845 : */
5846 48 : tgrel = table_open(TriggerRelationId, AccessShareLock);
5847 :
5848 258 : foreach(lc, conoidlist)
5849 : {
5850 210 : Oid conoid = lfirst_oid(lc);
5851 : ScanKeyData skey;
5852 : SysScanDesc tgscan;
5853 : HeapTuple htup;
5854 :
5855 210 : ScanKeyInit(&skey,
5856 : Anum_pg_trigger_tgconstraint,
5857 : BTEqualStrategyNumber, F_OIDEQ,
5858 : ObjectIdGetDatum(conoid));
5859 :
5860 210 : tgscan = systable_beginscan(tgrel, TriggerConstraintIndexId, true,
5861 : NULL, 1, &skey);
5862 :
5863 648 : while (HeapTupleIsValid(htup = systable_getnext(tgscan)))
5864 : {
5865 438 : Form_pg_trigger pg_trigger = (Form_pg_trigger) GETSTRUCT(htup);
5866 :
5867 : /*
5868 : * Silently skip triggers that are marked as non-deferrable in
5869 : * pg_trigger. This is not an error condition, since a
5870 : * deferrable RI constraint may have some non-deferrable
5871 : * actions.
5872 : */
5873 438 : if (pg_trigger->tgdeferrable)
5874 438 : tgoidlist = lappend_oid(tgoidlist, pg_trigger->oid);
5875 : }
5876 :
5877 210 : systable_endscan(tgscan);
5878 : }
5879 :
5880 48 : table_close(tgrel, AccessShareLock);
5881 :
5882 : /*
5883 : * Now we can set the trigger states of individual triggers for this
5884 : * xact.
5885 : */
5886 486 : foreach(lc, tgoidlist)
5887 : {
5888 438 : Oid tgoid = lfirst_oid(lc);
5889 438 : SetConstraintState state = afterTriggers.state;
5890 438 : bool found = false;
5891 : int i;
5892 :
5893 2448 : for (i = 0; i < state->numstates; i++)
5894 : {
5895 2106 : if (state->trigstates[i].sct_tgoid == tgoid)
5896 : {
5897 96 : state->trigstates[i].sct_tgisdeferred = stmt->deferred;
5898 96 : found = true;
5899 96 : break;
5900 : }
5901 : }
5902 438 : if (!found)
5903 : {
5904 342 : afterTriggers.state =
5905 342 : SetConstraintStateAddItem(state, tgoid, stmt->deferred);
5906 : }
5907 : }
5908 : }
5909 :
5910 : /*
5911 : * SQL99 requires that when a constraint is set to IMMEDIATE, any deferred
5912 : * checks against that constraint must be made when the SET CONSTRAINTS
5913 : * command is executed -- i.e. the effects of the SET CONSTRAINTS command
5914 : * apply retroactively. We've updated the constraints state, so scan the
5915 : * list of previously deferred events to fire any that have now become
5916 : * immediate.
5917 : *
5918 : * Obviously, if this was SET ... DEFERRED then it can't have converted
5919 : * any unfired events to immediate, so we need do nothing in that case.
5920 : */
5921 102 : if (!stmt->deferred)
5922 : {
5923 34 : AfterTriggerEventList *events = &afterTriggers.events;
5924 34 : bool snapshot_set = false;
5925 :
5926 34 : while (afterTriggerMarkEvents(events, NULL, true))
5927 : {
5928 16 : CommandId firing_id = afterTriggers.firing_counter++;
5929 :
5930 : /*
5931 : * Make sure a snapshot has been established in case trigger
5932 : * functions need one. Note that we avoid setting a snapshot if
5933 : * we don't find at least one trigger that has to be fired now.
5934 : * This is so that BEGIN; SET CONSTRAINTS ...; SET TRANSACTION
5935 : * ISOLATION LEVEL SERIALIZABLE; ... works properly. (If we are
5936 : * at the start of a transaction it's not possible for any trigger
5937 : * events to be queued yet.)
5938 : */
5939 16 : if (!snapshot_set)
5940 : {
5941 16 : PushActiveSnapshot(GetTransactionSnapshot());
5942 16 : snapshot_set = true;
5943 : }
5944 :
5945 : /*
5946 : * We can delete fired events if we are at top transaction level,
5947 : * but we'd better not if inside a subtransaction, since the
5948 : * subtransaction could later get rolled back.
5949 : */
5950 0 : if (afterTriggerInvokeEvents(events, firing_id, NULL,
5951 16 : !IsSubTransaction()))
5952 0 : break; /* all fired */
5953 : }
5954 :
5955 18 : if (snapshot_set)
5956 0 : PopActiveSnapshot();
5957 : }
5958 86 : }
5959 :
5960 : /* ----------
5961 : * AfterTriggerPendingOnRel()
5962 : * Test to see if there are any pending after-trigger events for rel.
5963 : *
5964 : * This is used by TRUNCATE, CLUSTER, ALTER TABLE, etc to detect whether
5965 : * it is unsafe to perform major surgery on a relation. Note that only
5966 : * local pending events are examined. We assume that having exclusive lock
5967 : * on a rel guarantees there are no unserviced events in other backends ---
5968 : * but having a lock does not prevent there being such events in our own.
5969 : *
5970 : * In some scenarios it'd be reasonable to remove pending events (more
5971 : * specifically, mark them DONE by the current subxact) but without a lot
5972 : * of knowledge of the trigger semantics we can't do this in general.
5973 : * ----------
5974 : */
5975 : bool
5976 98460 : AfterTriggerPendingOnRel(Oid relid)
5977 : {
5978 : AfterTriggerEvent event;
5979 : AfterTriggerEventChunk *chunk;
5980 : int depth;
5981 :
5982 : /* Scan queued events */
5983 98496 : for_each_event_chunk(event, chunk, afterTriggers.events)
5984 : {
5985 36 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
5986 :
5987 : /*
5988 : * We can ignore completed events. (Even if a DONE flag is rolled
5989 : * back by subxact abort, it's OK because the effects of the TRUNCATE
5990 : * or whatever must get rolled back too.)
5991 : */
5992 36 : if (event->ate_flags & AFTER_TRIGGER_DONE)
5993 0 : continue;
5994 :
5995 36 : if (evtshared->ats_relid == relid)
5996 18 : return true;
5997 : }
5998 :
5999 : /*
6000 : * Also scan events queued by incomplete queries. This could only matter
6001 : * if TRUNCATE/etc is executed by a function or trigger within an updating
6002 : * query on the same relation, which is pretty perverse, but let's check.
6003 : */
6004 98442 : for (depth = 0; depth <= afterTriggers.query_depth && depth < afterTriggers.maxquerydepth; depth++)
6005 : {
6006 0 : for_each_event_chunk(event, chunk, afterTriggers.query_stack[depth].events)
6007 : {
6008 0 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6009 :
6010 0 : if (event->ate_flags & AFTER_TRIGGER_DONE)
6011 0 : continue;
6012 :
6013 0 : if (evtshared->ats_relid == relid)
6014 0 : return true;
6015 : }
6016 : }
6017 :
6018 98442 : return false;
6019 : }
6020 :
6021 : /* ----------
6022 : * AfterTriggerSaveEvent()
6023 : *
6024 : * Called by ExecA[RS]...Triggers() to queue up the triggers that should
6025 : * be fired for an event.
6026 : *
6027 : * NOTE: this is called whenever there are any triggers associated with
6028 : * the event (even if they are disabled). This function decides which
6029 : * triggers actually need to be queued. It is also called after each row,
6030 : * even if there are no triggers for that event, if there are any AFTER
6031 : * STATEMENT triggers for the statement which use transition tables, so that
6032 : * the transition tuplestores can be built. Furthermore, if the transition
6033 : * capture is happening for UPDATEd rows being moved to another partition due
6034 : * to the partition-key being changed, then this function is called once when
6035 : * the row is deleted (to capture OLD row), and once when the row is inserted
6036 : * into another partition (to capture NEW row). This is done separately because
6037 : * DELETE and INSERT happen on different tables.
6038 : *
6039 : * Transition tuplestores are built now, rather than when events are pulled
6040 : * off of the queue because AFTER ROW triggers are allowed to select from the
6041 : * transition tables for the statement.
6042 : *
6043 : * This contains special support to queue the update events for the case where
6044 : * a partitioned table undergoing a cross-partition update may have foreign
6045 : * keys pointing into it. Normally, a partitioned table's row triggers are
6046 : * not fired because the leaf partition(s) which are modified as a result of
6047 : * the operation on the partitioned table contain the same triggers which are
6048 : * fired instead. But that general scheme can cause problematic behavior with
6049 : * foreign key triggers during cross-partition updates, which are implemented
6050 : * as DELETE on the source partition followed by INSERT into the destination
6051 : * partition. Specifically, firing DELETE triggers would lead to the wrong
6052 : * foreign key action to be enforced considering that the original command is
6053 : * UPDATE; in this case, this function is called with relinfo as the
6054 : * partitioned table, and src_partinfo and dst_partinfo referring to the
6055 : * source and target leaf partitions, respectively.
6056 : *
6057 : * is_crosspart_update is true either when a DELETE event is fired on the
6058 : * source partition (which is to be ignored) or an UPDATE event is fired on
6059 : * the root partitioned table.
6060 : * ----------
6061 : */
6062 : static void
6063 75810 : AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
6064 : ResultRelInfo *src_partinfo,
6065 : ResultRelInfo *dst_partinfo,
6066 : int event, bool row_trigger,
6067 : TupleTableSlot *oldslot, TupleTableSlot *newslot,
6068 : List *recheckIndexes, Bitmapset *modifiedCols,
6069 : TransitionCaptureState *transition_capture,
6070 : bool is_crosspart_update)
6071 : {
6072 75810 : Relation rel = relinfo->ri_RelationDesc;
6073 75810 : TriggerDesc *trigdesc = relinfo->ri_TrigDesc;
6074 : AfterTriggerEventData new_event;
6075 : AfterTriggerSharedData new_shared;
6076 75810 : char relkind = rel->rd_rel->relkind;
6077 : int tgtype_event;
6078 : int tgtype_level;
6079 : int i;
6080 75810 : Tuplestorestate *fdw_tuplestore = NULL;
6081 :
6082 : /*
6083 : * Check state. We use a normal test not Assert because it is possible to
6084 : * reach here in the wrong state given misconfigured RI triggers, in
6085 : * particular deferring a cascade action trigger.
6086 : */
6087 75810 : if (afterTriggers.query_depth < 0)
6088 0 : elog(ERROR, "AfterTriggerSaveEvent() called outside of query");
6089 :
6090 : /* Be sure we have enough space to record events at this query depth. */
6091 75810 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6092 5600 : AfterTriggerEnlargeQueryState();
6093 :
6094 : /*
6095 : * If the directly named relation has any triggers with transition tables,
6096 : * then we need to capture transition tuples.
6097 : */
6098 75810 : if (row_trigger && transition_capture != NULL)
6099 : {
6100 65772 : TupleTableSlot *original_insert_tuple = transition_capture->tcs_original_insert_tuple;
6101 :
6102 : /*
6103 : * Capture the old tuple in the appropriate transition table based on
6104 : * the event.
6105 : */
6106 65772 : if (!TupIsNull(oldslot))
6107 : {
6108 : Tuplestorestate *old_tuplestore;
6109 :
6110 5394 : old_tuplestore = GetAfterTriggersTransitionTable(event,
6111 : oldslot,
6112 : NULL,
6113 : transition_capture);
6114 5394 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6115 : oldslot, NULL, old_tuplestore);
6116 : }
6117 :
6118 : /*
6119 : * Capture the new tuple in the appropriate transition table based on
6120 : * the event.
6121 : */
6122 65772 : if (!TupIsNull(newslot))
6123 : {
6124 : Tuplestorestate *new_tuplestore;
6125 :
6126 60690 : new_tuplestore = GetAfterTriggersTransitionTable(event,
6127 : NULL,
6128 : newslot,
6129 : transition_capture);
6130 60690 : TransitionTableAddTuple(estate, transition_capture, relinfo,
6131 : newslot, original_insert_tuple, new_tuplestore);
6132 : }
6133 :
6134 : /*
6135 : * If transition tables are the only reason we're here, return. As
6136 : * mentioned above, we can also be here during update tuple routing in
6137 : * presence of transition tables, in which case this function is
6138 : * called separately for OLD and NEW, so we expect exactly one of them
6139 : * to be NULL.
6140 : */
6141 65772 : if (trigdesc == NULL ||
6142 65568 : (event == TRIGGER_EVENT_DELETE && !trigdesc->trig_delete_after_row) ||
6143 60588 : (event == TRIGGER_EVENT_INSERT && !trigdesc->trig_insert_after_row) ||
6144 354 : (event == TRIGGER_EVENT_UPDATE && !trigdesc->trig_update_after_row) ||
6145 36 : (event == TRIGGER_EVENT_UPDATE && (TupIsNull(oldslot) ^ TupIsNull(newslot))))
6146 65658 : return;
6147 : }
6148 :
6149 : /*
6150 : * We normally don't see partitioned tables here for row level triggers
6151 : * except in the special case of a cross-partition update. In that case,
6152 : * nodeModifyTable.c:ExecCrossPartitionUpdateForeignKey() calls here to
6153 : * queue an update event on the root target partitioned table, also
6154 : * passing the source and destination partitions and their tuples.
6155 : */
6156 : Assert(!row_trigger ||
6157 : rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE ||
6158 : (is_crosspart_update &&
6159 : TRIGGER_FIRED_BY_UPDATE(event) &&
6160 : src_partinfo != NULL && dst_partinfo != NULL));
6161 :
6162 : /*
6163 : * Validate the event code and collect the associated tuple CTIDs.
6164 : *
6165 : * The event code will be used both as a bitmask and an array offset, so
6166 : * validation is important to make sure we don't walk off the edge of our
6167 : * arrays.
6168 : *
6169 : * Also, if we're considering statement-level triggers, check whether we
6170 : * already queued a set of them for this event, and cancel the prior set
6171 : * if so. This preserves the behavior that statement-level triggers fire
6172 : * just once per statement and fire after row-level triggers.
6173 : */
6174 10152 : switch (event)
6175 : {
6176 5496 : case TRIGGER_EVENT_INSERT:
6177 5496 : tgtype_event = TRIGGER_TYPE_INSERT;
6178 5496 : if (row_trigger)
6179 : {
6180 : Assert(oldslot == NULL);
6181 : Assert(newslot != NULL);
6182 5048 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid1));
6183 5048 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6184 : }
6185 : else
6186 : {
6187 : Assert(oldslot == NULL);
6188 : Assert(newslot == NULL);
6189 448 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6190 448 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6191 448 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6192 : CMD_INSERT, event);
6193 : }
6194 5496 : break;
6195 1252 : case TRIGGER_EVENT_DELETE:
6196 1252 : tgtype_event = TRIGGER_TYPE_DELETE;
6197 1252 : if (row_trigger)
6198 : {
6199 : Assert(oldslot != NULL);
6200 : Assert(newslot == NULL);
6201 1022 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6202 1022 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6203 : }
6204 : else
6205 : {
6206 : Assert(oldslot == NULL);
6207 : Assert(newslot == NULL);
6208 230 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6209 230 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6210 230 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6211 : CMD_DELETE, event);
6212 : }
6213 1252 : break;
6214 3396 : case TRIGGER_EVENT_UPDATE:
6215 3396 : tgtype_event = TRIGGER_TYPE_UPDATE;
6216 3396 : if (row_trigger)
6217 : {
6218 : Assert(oldslot != NULL);
6219 : Assert(newslot != NULL);
6220 3000 : ItemPointerCopy(&(oldslot->tts_tid), &(new_event.ate_ctid1));
6221 3000 : ItemPointerCopy(&(newslot->tts_tid), &(new_event.ate_ctid2));
6222 :
6223 : /*
6224 : * Also remember the OIDs of partitions to fetch these tuples
6225 : * out of later in AfterTriggerExecute().
6226 : */
6227 3000 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6228 : {
6229 : Assert(src_partinfo != NULL && dst_partinfo != NULL);
6230 234 : new_event.ate_src_part =
6231 234 : RelationGetRelid(src_partinfo->ri_RelationDesc);
6232 234 : new_event.ate_dst_part =
6233 234 : RelationGetRelid(dst_partinfo->ri_RelationDesc);
6234 : }
6235 : }
6236 : else
6237 : {
6238 : Assert(oldslot == NULL);
6239 : Assert(newslot == NULL);
6240 396 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6241 396 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6242 396 : cancel_prior_stmt_triggers(RelationGetRelid(rel),
6243 : CMD_UPDATE, event);
6244 : }
6245 3396 : break;
6246 8 : case TRIGGER_EVENT_TRUNCATE:
6247 8 : tgtype_event = TRIGGER_TYPE_TRUNCATE;
6248 : Assert(oldslot == NULL);
6249 : Assert(newslot == NULL);
6250 8 : ItemPointerSetInvalid(&(new_event.ate_ctid1));
6251 8 : ItemPointerSetInvalid(&(new_event.ate_ctid2));
6252 8 : break;
6253 0 : default:
6254 0 : elog(ERROR, "invalid after-trigger event code: %d", event);
6255 : tgtype_event = 0; /* keep compiler quiet */
6256 : break;
6257 : }
6258 :
6259 : /* Determine flags */
6260 10152 : if (!(relkind == RELKIND_FOREIGN_TABLE && row_trigger))
6261 : {
6262 10096 : if (row_trigger && event == TRIGGER_EVENT_UPDATE)
6263 : {
6264 2980 : if (relkind == RELKIND_PARTITIONED_TABLE)
6265 234 : new_event.ate_flags = AFTER_TRIGGER_CP_UPDATE;
6266 : else
6267 2746 : new_event.ate_flags = AFTER_TRIGGER_2CTID;
6268 : }
6269 : else
6270 7116 : new_event.ate_flags = AFTER_TRIGGER_1CTID;
6271 : }
6272 :
6273 : /* else, we'll initialize ate_flags for each trigger */
6274 :
6275 10152 : tgtype_level = (row_trigger ? TRIGGER_TYPE_ROW : TRIGGER_TYPE_STATEMENT);
6276 :
6277 : /*
6278 : * Must convert/copy the source and destination partition tuples into the
6279 : * root partitioned table's format/slot, because the processing in the
6280 : * loop below expects both oldslot and newslot tuples to be in that form.
6281 : */
6282 10152 : if (row_trigger && rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6283 : {
6284 : TupleTableSlot *rootslot;
6285 : TupleConversionMap *map;
6286 :
6287 234 : rootslot = ExecGetTriggerOldSlot(estate, relinfo);
6288 234 : map = ExecGetChildToRootMap(src_partinfo);
6289 234 : if (map)
6290 36 : oldslot = execute_attr_map_slot(map->attrMap,
6291 : oldslot,
6292 : rootslot);
6293 : else
6294 198 : oldslot = ExecCopySlot(rootslot, oldslot);
6295 :
6296 234 : rootslot = ExecGetTriggerNewSlot(estate, relinfo);
6297 234 : map = ExecGetChildToRootMap(dst_partinfo);
6298 234 : if (map)
6299 36 : newslot = execute_attr_map_slot(map->attrMap,
6300 : newslot,
6301 : rootslot);
6302 : else
6303 198 : newslot = ExecCopySlot(rootslot, newslot);
6304 : }
6305 :
6306 47508 : for (i = 0; i < trigdesc->numtriggers; i++)
6307 : {
6308 37356 : Trigger *trigger = &trigdesc->triggers[i];
6309 :
6310 37356 : if (!TRIGGER_TYPE_MATCHES(trigger->tgtype,
6311 : tgtype_level,
6312 : TRIGGER_TYPE_AFTER,
6313 : tgtype_event))
6314 24240 : continue;
6315 13116 : if (!TriggerEnabled(estate, relinfo, trigger, event,
6316 : modifiedCols, oldslot, newslot))
6317 368 : continue;
6318 :
6319 12748 : if (relkind == RELKIND_FOREIGN_TABLE && row_trigger)
6320 : {
6321 58 : if (fdw_tuplestore == NULL)
6322 : {
6323 50 : fdw_tuplestore = GetCurrentFDWTuplestore();
6324 50 : new_event.ate_flags = AFTER_TRIGGER_FDW_FETCH;
6325 : }
6326 : else
6327 : /* subsequent event for the same tuple */
6328 8 : new_event.ate_flags = AFTER_TRIGGER_FDW_REUSE;
6329 : }
6330 :
6331 : /*
6332 : * If the trigger is a foreign key enforcement trigger, there are
6333 : * certain cases where we can skip queueing the event because we can
6334 : * tell by inspection that the FK constraint will still pass. There
6335 : * are also some cases during cross-partition updates of a partitioned
6336 : * table where queuing the event can be skipped.
6337 : */
6338 12748 : if (TRIGGER_FIRED_BY_UPDATE(event) || TRIGGER_FIRED_BY_DELETE(event))
6339 : {
6340 6066 : switch (RI_FKey_trigger_type(trigger->tgfoid))
6341 : {
6342 2230 : case RI_TRIGGER_PK:
6343 :
6344 : /*
6345 : * For cross-partitioned updates of partitioned PK table,
6346 : * skip the event fired by the component delete on the
6347 : * source leaf partition unless the constraint originates
6348 : * in the partition itself (!tgisclone), because the
6349 : * update event that will be fired on the root
6350 : * (partitioned) target table will be used to perform the
6351 : * necessary foreign key enforcement action.
6352 : */
6353 2230 : if (is_crosspart_update &&
6354 498 : TRIGGER_FIRED_BY_DELETE(event) &&
6355 264 : trigger->tgisclone)
6356 246 : continue;
6357 :
6358 : /* Update or delete on trigger's PK table */
6359 1984 : if (!RI_FKey_pk_upd_check_required(trigger, rel,
6360 : oldslot, newslot))
6361 : {
6362 : /* skip queuing this event */
6363 542 : continue;
6364 : }
6365 1442 : break;
6366 :
6367 1086 : case RI_TRIGGER_FK:
6368 :
6369 : /*
6370 : * Update on trigger's FK table. We can skip the update
6371 : * event fired on a partitioned table during a
6372 : * cross-partition of that table, because the insert event
6373 : * that is fired on the destination leaf partition would
6374 : * suffice to perform the necessary foreign key check.
6375 : * Moreover, RI_FKey_fk_upd_check_required() expects to be
6376 : * passed a tuple that contains system attributes, most of
6377 : * which are not present in the virtual slot belonging to
6378 : * a partitioned table.
6379 : */
6380 1086 : if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ||
6381 1020 : !RI_FKey_fk_upd_check_required(trigger, rel,
6382 : oldslot, newslot))
6383 : {
6384 : /* skip queuing this event */
6385 656 : continue;
6386 : }
6387 430 : break;
6388 :
6389 2750 : case RI_TRIGGER_NONE:
6390 :
6391 : /*
6392 : * Not an FK trigger. No need to queue the update event
6393 : * fired during a cross-partitioned update of a
6394 : * partitioned table, because the same row trigger must be
6395 : * present in the leaf partition(s) that are affected as
6396 : * part of this update and the events fired on them are
6397 : * queued instead.
6398 : */
6399 2750 : if (row_trigger &&
6400 2088 : rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
6401 30 : continue;
6402 2720 : break;
6403 : }
6404 6682 : }
6405 :
6406 : /*
6407 : * If the trigger is a deferred unique constraint check trigger, only
6408 : * queue it if the unique constraint was potentially violated, which
6409 : * we know from index insertion time.
6410 : */
6411 11274 : if (trigger->tgfoid == F_UNIQUE_KEY_RECHECK)
6412 : {
6413 210 : if (!list_member_oid(recheckIndexes, trigger->tgconstrindid))
6414 88 : continue; /* Uniqueness definitely not violated */
6415 : }
6416 :
6417 : /*
6418 : * Fill in event structure and add it to the current query's queue.
6419 : * Note we set ats_table to NULL whenever this trigger doesn't use
6420 : * transition tables, to improve sharability of the shared event data.
6421 : */
6422 11186 : new_shared.ats_event =
6423 22372 : (event & TRIGGER_EVENT_OPMASK) |
6424 11186 : (row_trigger ? TRIGGER_EVENT_ROW : 0) |
6425 11186 : (trigger->tgdeferrable ? AFTER_TRIGGER_DEFERRABLE : 0) |
6426 11186 : (trigger->tginitdeferred ? AFTER_TRIGGER_INITDEFERRED : 0);
6427 11186 : new_shared.ats_tgoid = trigger->tgoid;
6428 11186 : new_shared.ats_relid = RelationGetRelid(rel);
6429 11186 : new_shared.ats_firing_id = 0;
6430 11186 : if ((trigger->tgoldtable || trigger->tgnewtable) &&
6431 : transition_capture != NULL)
6432 606 : new_shared.ats_table = transition_capture->tcs_private;
6433 : else
6434 10580 : new_shared.ats_table = NULL;
6435 11186 : new_shared.ats_modifiedcols = afterTriggerCopyBitmap(modifiedCols);
6436 :
6437 11186 : afterTriggerAddEvent(&afterTriggers.query_stack[afterTriggers.query_depth].events,
6438 : &new_event, &new_shared);
6439 : }
6440 :
6441 : /*
6442 : * Finally, spool any foreign tuple(s). The tuplestore squashes them to
6443 : * minimal tuples, so this loses any system columns. The executor lost
6444 : * those columns before us, for an unrelated reason, so this is fine.
6445 : */
6446 10152 : if (fdw_tuplestore)
6447 : {
6448 50 : if (oldslot != NULL)
6449 32 : tuplestore_puttupleslot(fdw_tuplestore, oldslot);
6450 50 : if (newslot != NULL)
6451 36 : tuplestore_puttupleslot(fdw_tuplestore, newslot);
6452 : }
6453 : }
6454 :
6455 : /*
6456 : * Detect whether we already queued BEFORE STATEMENT triggers for the given
6457 : * relation + operation, and set the flag so the next call will report "true".
6458 : */
6459 : static bool
6460 510 : before_stmt_triggers_fired(Oid relid, CmdType cmdType)
6461 : {
6462 : bool result;
6463 : AfterTriggersTableData *table;
6464 :
6465 : /* Check state, like AfterTriggerSaveEvent. */
6466 510 : if (afterTriggers.query_depth < 0)
6467 0 : elog(ERROR, "before_stmt_triggers_fired() called outside of query");
6468 :
6469 : /* Be sure we have enough space to record events at this query depth. */
6470 510 : if (afterTriggers.query_depth >= afterTriggers.maxquerydepth)
6471 336 : AfterTriggerEnlargeQueryState();
6472 :
6473 : /*
6474 : * We keep this state in the AfterTriggersTableData that also holds
6475 : * transition tables for the relation + operation. In this way, if we are
6476 : * forced to make a new set of transition tables because more tuples get
6477 : * entered after we've already fired triggers, we will allow a new set of
6478 : * statement triggers to get queued.
6479 : */
6480 510 : table = GetAfterTriggersTableData(relid, cmdType);
6481 510 : result = table->before_trig_done;
6482 510 : table->before_trig_done = true;
6483 510 : return result;
6484 : }
6485 :
6486 : /*
6487 : * If we previously queued a set of AFTER STATEMENT triggers for the given
6488 : * relation + operation, and they've not been fired yet, cancel them. The
6489 : * caller will queue a fresh set that's after any row-level triggers that may
6490 : * have been queued by the current sub-statement, preserving (as much as
6491 : * possible) the property that AFTER ROW triggers fire before AFTER STATEMENT
6492 : * triggers, and that the latter only fire once. This deals with the
6493 : * situation where several FK enforcement triggers sequentially queue triggers
6494 : * for the same table into the same trigger query level. We can't fully
6495 : * prevent odd behavior though: if there are AFTER ROW triggers taking
6496 : * transition tables, we don't want to change the transition tables once the
6497 : * first such trigger has seen them. In such a case, any additional events
6498 : * will result in creating new transition tables and allowing new firings of
6499 : * statement triggers.
6500 : *
6501 : * This also saves the current event list location so that a later invocation
6502 : * of this function can cheaply find the triggers we're about to queue and
6503 : * cancel them.
6504 : */
6505 : static void
6506 1074 : cancel_prior_stmt_triggers(Oid relid, CmdType cmdType, int tgevent)
6507 : {
6508 : AfterTriggersTableData *table;
6509 1074 : AfterTriggersQueryData *qs = &afterTriggers.query_stack[afterTriggers.query_depth];
6510 :
6511 : /*
6512 : * We keep this state in the AfterTriggersTableData that also holds
6513 : * transition tables for the relation + operation. In this way, if we are
6514 : * forced to make a new set of transition tables because more tuples get
6515 : * entered after we've already fired triggers, we will allow a new set of
6516 : * statement triggers to get queued without canceling the old ones.
6517 : */
6518 1074 : table = GetAfterTriggersTableData(relid, cmdType);
6519 :
6520 1074 : if (table->after_trig_done)
6521 : {
6522 : /*
6523 : * We want to start scanning from the tail location that existed just
6524 : * before we inserted any statement triggers. But the events list
6525 : * might've been entirely empty then, in which case scan from the
6526 : * current head.
6527 : */
6528 : AfterTriggerEvent event;
6529 : AfterTriggerEventChunk *chunk;
6530 :
6531 66 : if (table->after_trig_events.tail)
6532 : {
6533 60 : chunk = table->after_trig_events.tail;
6534 60 : event = (AfterTriggerEvent) table->after_trig_events.tailfree;
6535 : }
6536 : else
6537 : {
6538 6 : chunk = qs->events.head;
6539 6 : event = NULL;
6540 : }
6541 :
6542 96 : for_each_chunk_from(chunk)
6543 : {
6544 66 : if (event == NULL)
6545 6 : event = (AfterTriggerEvent) CHUNK_DATA_START(chunk);
6546 138 : for_each_event_from(event, chunk)
6547 : {
6548 108 : AfterTriggerShared evtshared = GetTriggerSharedData(event);
6549 :
6550 : /*
6551 : * Exit loop when we reach events that aren't AS triggers for
6552 : * the target relation.
6553 : */
6554 108 : if (evtshared->ats_relid != relid)
6555 0 : goto done;
6556 108 : if ((evtshared->ats_event & TRIGGER_EVENT_OPMASK) != tgevent)
6557 0 : goto done;
6558 108 : if (!TRIGGER_FIRED_FOR_STATEMENT(evtshared->ats_event))
6559 36 : goto done;
6560 72 : if (!TRIGGER_FIRED_AFTER(evtshared->ats_event))
6561 0 : goto done;
6562 : /* OK, mark it DONE */
6563 72 : event->ate_flags &= ~AFTER_TRIGGER_IN_PROGRESS;
6564 72 : event->ate_flags |= AFTER_TRIGGER_DONE;
6565 : }
6566 : /* signal we must reinitialize event ptr for next chunk */
6567 30 : event = NULL;
6568 : }
6569 : }
6570 1038 : done:
6571 :
6572 : /* In any case, save current insertion point for next time */
6573 1074 : table->after_trig_done = true;
6574 1074 : table->after_trig_events = qs->events;
6575 1074 : }
6576 :
6577 : /*
6578 : * GUC assign_hook for session_replication_role
6579 : */
6580 : void
6581 2624 : assign_session_replication_role(int newval, void *extra)
6582 : {
6583 : /*
6584 : * Must flush the plan cache when changing replication role; but don't
6585 : * flush unnecessarily.
6586 : */
6587 2624 : if (SessionReplicationRole != newval)
6588 772 : ResetPlanCache();
6589 2624 : }
6590 :
6591 : /*
6592 : * SQL function pg_trigger_depth()
6593 : */
6594 : Datum
6595 90 : pg_trigger_depth(PG_FUNCTION_ARGS)
6596 : {
6597 90 : PG_RETURN_INT32(MyTriggerDepth);
6598 : }
|
