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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/prep/prepunion.c
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@ -14,7 +14,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.84 2003/01/05 00:56:40 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.85 2003/01/12 22:35:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -853,7 +853,7 @@ adjust_inherited_attrs_mutator(Node *node,
adjust_inherited_attrs_mutator((Node *) oldinfo->clause, context);
newinfo->subclauseindices = NIL;
newinfo->eval_cost = -1; /* reset these too */
newinfo->eval_cost.startup = -1; /* reset these too */
newinfo->this_selec = -1;
newinfo->left_pathkey = NIL; /* and these */
newinfo->right_pathkey = NIL;