diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-11-20 20:38:12 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-11-20 20:38:12 +0000 |
| commit | 7fc0f06221d22632daa3ff8b70919b43e8a242ca (patch) | |
| tree | a2ec73a6256c30ba9cb2d4723868978c5136ba5e /src/backend/executor/execMain.c | |
| parent | 201a45c4fa23c485cf2e14ac9db8064b2c559fdc (diff) | |
| download | postgresql-7fc0f06221d22632daa3ff8b70919b43e8a242ca.tar.gz postgresql-7fc0f06221d22632daa3ff8b70919b43e8a242ca.zip | |
Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be
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.
Diffstat (limited to 'src/backend/executor/execMain.c')
| -rw-r--r-- | src/backend/executor/execMain.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c index d7d99bc0aea..60ded334c68 100644 --- a/src/backend/executor/execMain.c +++ b/src/backend/executor/execMain.c @@ -26,7 +26,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.334 2009/10/26 02:26:29 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.335 2009/11/20 20:38:10 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -752,6 +752,7 @@ InitPlan(QueryDesc *queryDesc, int eflags) */ estate->es_tupleTable = NIL; estate->es_trig_tuple_slot = NULL; + estate->es_trig_oldtup_slot = NULL; /* mark EvalPlanQual not active */ estate->es_epqTuple = NULL; @@ -911,6 +912,8 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo, resultRelInfo->ri_TrigFunctions = (FmgrInfo *) palloc0(n * sizeof(FmgrInfo)); + resultRelInfo->ri_TrigWhenExprs = (List **) + palloc0(n * sizeof(List *)); if (doInstrument) resultRelInfo->ri_TrigInstrument = InstrAlloc(n); else @@ -919,6 +922,7 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo, else { resultRelInfo->ri_TrigFunctions = NULL; + resultRelInfo->ri_TrigWhenExprs = NULL; resultRelInfo->ri_TrigInstrument = NULL; } resultRelInfo->ri_ConstraintExprs = NULL; |