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Fix the plan-invalidation mechanism to treat regclass constants that refer to

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a relation as a reason to invalidate a plan when the relation changes.  This
handles scenarios such as dropping/recreating a sequence that is referenced by
nextval('seq') in a cached plan.  Rather than teach plancache.c all about
digging through plan trees to find regclass Consts, we charge the planner's
setrefs.c with making a list of the relation OIDs on which each plan depends.
That way the list can be built cheaply during a plan tree traversal that has
to happen anyway.  Per bug #3662 and subsequent discussion.
This commit is contained in:
Tom Lane
2007-10-11 18:05:27 +00:00
parent 68b08b2512
commit 82d8ab6fc4
10 changed files with 223 additions and 101 deletions
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4
src/backend/nodes/outfuncs.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.314 2007/08/31 01:44:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.315 2007/10/11 18:05:27 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@@ -250,6 +250,7 @@ _outPlannedStmt(StringInfo str, PlannedStmt *node)
WRITE_BITMAPSET_FIELD(rewindPlanIDs);
WRITE_NODE_FIELD(returningLists);
WRITE_NODE_FIELD(rowMarks);
WRITE_NODE_FIELD(relationOids);
WRITE_INT_FIELD(nParamExec);
}
@@ -1300,6 +1301,7 @@ _outPlannerGlobal(StringInfo str, PlannerGlobal *node)
WRITE_NODE_FIELD(subrtables);
WRITE_BITMAPSET_FIELD(rewindPlanIDs);
WRITE_NODE_FIELD(finalrtable);
WRITE_NODE_FIELD(relationOids);
}
static void