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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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7
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.211 2009/10/26 02:26:41 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.212 2009/11/20 20:38:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -294,6 +294,7 @@ typedef struct JunkFilter
* IndexRelationInfo array of key/attr info for indices
* TrigDesc triggers to be fired, if any
* TrigFunctions cached lookup info for trigger functions
* TrigWhenExprs array of trigger WHEN expr states
* TrigInstrument optional runtime measurements for triggers
* ConstraintExprs array of constraint-checking expr states
* junkFilter for removing junk attributes from tuples
@ -310,6 +311,7 @@ typedef struct ResultRelInfo
IndexInfo **ri_IndexRelationInfo;
TriggerDesc *ri_TrigDesc;
FmgrInfo *ri_TrigFunctions;
List **ri_TrigWhenExprs;
struct Instrumentation *ri_TrigInstrument;
List **ri_ConstraintExprs;
JunkFilter *ri_junkFilter;
@ -345,7 +347,8 @@ typedef struct EState
/* Stuff used for firing triggers: */
List *es_trig_target_relations; /* trigger-only ResultRelInfos */
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
TupleTableSlot *es_trig_oldtup_slot; /* for trigger old tuples */
/* Parameter info: */
ParamListInfo es_param_list_info; /* values of external params */