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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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3
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.382 2007/09/03 18:46:30 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.383 2007/10/11 18:05:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -83,6 +83,7 @@ _copyPlannedStmt(PlannedStmt *from)
COPY_BITMAPSET_FIELD(rewindPlanIDs);
COPY_NODE_FIELD(returningLists);
COPY_NODE_FIELD(rowMarks);
COPY_NODE_FIELD(relationOids);
COPY_SCALAR_FIELD(nParamExec);
return newnode;