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pg_trigger's index on tgrelid is replaced by a unique index on

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(tgrelid, tgname).  This provides an additional check on trigger name
uniqueness per-table (which was already enforced by the code anyway).
With this change, RelationBuildTriggers will read the triggers in
order by tgname, since it's scanning using this index.  Since a
predictable trigger ordering has been requested for some time, document
this behavior as a feature.  Also document that rules fire in name
order, since yesterday's changes to pg_rewrite indexing cause that too.
This commit is contained in:
Tom Lane
2002-04-19 16:36:08 +00:00
parent 87d00363cb
commit 201737168c
11 changed files with 230 additions and 172 deletions
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6
src/backend/commands/tablecmds.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.3 2002/04/18 20:01:09 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.4 2002/04/19 16:36:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -2909,10 +2909,10 @@ update_ri_trigger_args(Oid relid,
if (fk_scan)
irel = index_openr(TriggerConstrRelidIndex);
else
irel = index_openr(TriggerRelidIndex);
irel = index_openr(TriggerRelidNameIndex);
ScanKeyEntryInitialize(&skey[0], 0x0,
1, /* always column 1 of index */
1, /* column 1 of index in either case */
F_OIDEQ,
ObjectIdGetDatum(relid));
idxtgscan = index_beginscan(irel, false, 1, skey);