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Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be

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checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.
This commit is contained in:
Tom Lane
2009-11-20 20:38:12 +00:00
parent 201a45c4fa
commit 7fc0f06221
27 changed files with 783 additions and 100 deletions
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5
src/backend/catalog/index.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.323 2009/10/14 22:14:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/catalog/index.c,v 1.324 2009/11/20 20:38:09 tgl Exp $
*
*
* INTERFACE ROUTINES
@@ -793,12 +793,13 @@ index_create(Oid heapRelationId,
trigger->row = true;
trigger->events = TRIGGER_TYPE_INSERT | TRIGGER_TYPE_UPDATE;
trigger->columns = NIL;
trigger->whenClause = NULL;
trigger->isconstraint = true;
trigger->deferrable = true;
trigger->initdeferred = initdeferred;
trigger->constrrel = NULL;
(void) CreateTrigger(trigger, conOid, indexRelationId,
(void) CreateTrigger(trigger, NULL, conOid, indexRelationId,
isprimary ? "PK_ConstraintTrigger" :
"Unique_ConstraintTrigger",
false);