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Remove unnecessary opening of other relation in RI_FKey_keyequal_upd_pk 

and RI_FKey_keyequal_upd_fk, as well as no-longer-needed calls of
ri_BuildQueryKeyFull.  Aside from saving a few cycles, this avoids needless
deadlock risks when an update is not changing the columns that participate
in an RI constraint.  Per a gripe from Alexey Nalbat.

Back-patch to 8.3.  Earlier releases did have a need to open the other
relation due to the way in which they retrieved information about the RI
constraint, so this problem unfortunately can't easily be improved pre-8.3.

Tom Lane and Stephan Szabo
This commit is contained in:
Tom Lane 2008-02-18 23:00:32 +00:00
parent fc54be81d1
commit cf59277ac9
1 changed files with 4 additions and 22 deletions
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26
src/backend/utils/adt/ri_triggers.c
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@ -15,7 +15,7 @@
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.103 2008/02/07 22:58:35 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.104 2008/02/18 23:00:32 tgl Exp $
*
* ----------
*/
@ -67,13 +67,12 @@
#define RI_PLAN_RESTRICT_UPD_CHECKREF 8
#define RI_PLAN_SETNULL_DEL_DOUPDATE 9
#define RI_PLAN_SETNULL_UPD_DOUPDATE 10
#define RI_PLAN_KEYEQUAL_UPD 11
#define MAX_QUOTED_NAME_LEN (NAMEDATALEN*2+3)
#define MAX_QUOTED_REL_NAME_LEN (MAX_QUOTED_NAME_LEN*2)
#define RIAttName(rel, attnum) NameStr(*attnumAttName(rel, attnum))
#define RIAttType(rel, attnum) SPI_gettypeid(RelationGetDescr(rel), attnum)
#define RIAttType(rel, attnum) attnumTypeId(rel, attnum)
#define RI_TRIGTYPE_INSERT 1
#define RI_TRIGTYPE_UPDATE 2
@ -2516,8 +2515,6 @@ RI_FKey_keyequal_upd_pk(Trigger *trigger, Relation pk_rel,
HeapTuple old_row, HeapTuple new_row)
{
RI_ConstraintInfo riinfo;
Relation fk_rel;
RI_QueryKey qkey;
/*
* Get arguments.
@ -2530,18 +2527,11 @@ RI_FKey_keyequal_upd_pk(Trigger *trigger, Relation pk_rel,
if (riinfo.nkeys == 0)
return true;
fk_rel = heap_open(riinfo.fk_relid, AccessShareLock);
switch (riinfo.confmatchtype)
{
case FKCONSTR_MATCH_UNSPECIFIED:
case FKCONSTR_MATCH_FULL:
ri_BuildQueryKeyFull(&qkey, &riinfo,
RI_PLAN_KEYEQUAL_UPD);
heap_close(fk_rel, AccessShareLock);
/* Return if key's are equal */
/* Return true if keys are equal */
return ri_KeysEqual(pk_rel, old_row, new_row, &riinfo, true);
/* Handle MATCH PARTIAL set null delete. */
@ -2570,8 +2560,6 @@ RI_FKey_keyequal_upd_fk(Trigger *trigger, Relation fk_rel,
HeapTuple old_row, HeapTuple new_row)
{
RI_ConstraintInfo riinfo;
Relation pk_rel;
RI_QueryKey qkey;
/*
* Get arguments.
@ -2584,17 +2572,11 @@ RI_FKey_keyequal_upd_fk(Trigger *trigger, Relation fk_rel,
if (riinfo.nkeys == 0)
return true;
pk_rel = heap_open(riinfo.pk_relid, AccessShareLock);
switch (riinfo.confmatchtype)
{
case FKCONSTR_MATCH_UNSPECIFIED:
case FKCONSTR_MATCH_FULL:
ri_BuildQueryKeyFull(&qkey, &riinfo,
RI_PLAN_KEYEQUAL_UPD);
heap_close(pk_rel, AccessShareLock);
/* Return if key's are equal */
/* Return true if keys are equal */
return ri_KeysEqual(fk_rel, old_row, new_row, &riinfo, false);
/* Handle MATCH PARTIAL set null delete. */