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Cache eval cost of qualification expressions in RestrictInfo nodes to

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avoid repeated evaluations in cost_qual_eval().  This turns out to save
a useful fraction of planning time.  No change to external representation
of RestrictInfo --- although that node type doesn't appear in stored
rules anyway.
This commit is contained in:
Tom Lane
2000-12-12 23:33:34 +00:00
parent 77c443f8cd
commit 17b843d677
7 changed files with 54 additions and 24 deletions
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6
src/backend/nodes/equalfuncs.c
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@@ -20,7 +20,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.83 2000/11/24 20:16:39 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.84 2000/12/12 23:33:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -514,6 +514,10 @@ _equalRestrictInfo(RestrictInfo *a, RestrictInfo *b)
{
if (!equal(a->clause, b->clause))
return false;
/*
* ignore eval_cost, since it may not be set yet, and should be
* derivable from the clause anyway
*/
if (a->ispusheddown != b->ispusheddown)
return false;
if (!equal(a->subclauseindices, b->subclauseindices))