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Revise cost_qual_eval() to compute both startup (one-time) and per-tuple

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costs for expression evaluation, not only per-tuple cost as before.
This extension is needed in order to deal realistically with hashed or
materialized sub-selects.
This commit is contained in:
Tom Lane
2003-01-12 22:35:29 +00:00
parent d51260aa9d
commit d4ce5a4f4c
8 changed files with 164 additions and 71 deletions
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4
src/backend/optimizer/plan/initsplan.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.79 2002/12/17 01:18:25 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.80 2003/01/12 22:35:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -396,7 +396,7 @@ distribute_qual_to_rels(Query *root, Node *clause,
restrictinfo->clause = (Expr *) clause;
restrictinfo->subclauseindices = NIL;
restrictinfo->eval_cost = -1; /* not computed until needed */
restrictinfo->eval_cost.startup = -1; /* not computed until needed */
restrictinfo->this_selec = -1; /* not computed until needed */
restrictinfo->mergejoinoperator = InvalidOid;
restrictinfo->left_sortop = InvalidOid;