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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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4
src/backend/tcop/utility.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.317 2009/11/16 21:32:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.318 2009/11/20 20:38:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -939,7 +939,7 @@ ProcessUtility(Node *parsetree,
break;
case T_CreateTrigStmt:
CreateTrigger((CreateTrigStmt *) parsetree,
CreateTrigger((CreateTrigStmt *) parsetree, queryString,
InvalidOid, InvalidOid, NULL, true);
break;