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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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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
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.133 2000/11/24 20:16:39 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.134 2000/12/12 23:33:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1418,6 +1418,7 @@ _copyRestrictInfo(RestrictInfo *from)
* ----------------
*/
Node_Copy(from, newnode, clause);
newnode->eval_cost = from->eval_cost;
newnode->ispusheddown = from->ispusheddown;
Node_Copy(from, newnode, subclauseindices);
newnode->mergejoinoperator = from->mergejoinoperator;