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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/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: cost.h,v 1.49 2002/11/30 05:21:03 tgl Exp $
* $Id: cost.h,v 1.50 2003/01/12 22:35:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -83,7 +83,7 @@ extern void cost_hashjoin(Path *path, Query *root,
Path *outer_path, Path *inner_path,
List *restrictlist,
List *hashclauses);
extern Cost cost_qual_eval(List *quals);
extern void cost_qual_eval(QualCost *cost, List *quals);
extern void set_baserel_size_estimates(Query *root, RelOptInfo *rel);
extern void set_joinrel_size_estimates(Query *root, RelOptInfo *rel,
RelOptInfo *outer_rel,