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Improve the plan cache invalidation mechanism to make it invalidate plans

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when user-defined functions used in a plan are modified.  Also invalidate
plans when schemas, operators, or operator classes are modified; but for these
cases we just invalidate everything rather than tracking exact dependencies,
since these types of objects seldom change in a production database.

Tom Lane; loosely based on a patch by Martin Pihlak.
This commit is contained in:
Tom Lane
2008-09-09 18:58:09 +00:00
parent c06629c72e
commit ee33b95d9c
18 changed files with 522 additions and 275 deletions
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5
src/include/utils/plancache.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/plancache.h,v 1.12 2008/07/18 20:26:06 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/plancache.h,v 1.13 2008/09/09 18:58:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -79,6 +79,9 @@ typedef struct CachedPlan
int refcount; /* count of live references to this struct */
int generation; /* counter, starting at 1, for replans */
MemoryContext context; /* context containing this CachedPlan */
/* These fields are used only in the not-fully-planned case: */
List *relationOids; /* OIDs of relations the stmts depend on */
List *invalItems; /* other dependencies, as PlanInvalItems */
} CachedPlan;