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Fix cost_nestloop and cost_hashjoin to model the behavior of semi and anti

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joins a bit better, ie, understand the differing cost functions for matched
and unmatched outer tuples.  There is more that could be done in cost_hashjoin
but this already helps a great deal.  Per discussions with Robert Haas.
This commit is contained in:
Tom Lane
2009-05-09 22:51:41 +00:00
parent a41e9ec0db
commit 8dcf18414b
4 changed files with 388 additions and 97 deletions
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4
src/include/optimizer/restrictinfo.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.43 2009/04/16 20:42:16 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.44 2009/05/09 22:51:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -39,6 +39,6 @@ extern void extract_actual_join_clauses(List *restrictinfo_list,
List **otherquals);
extern List *select_nonredundant_join_clauses(PlannerInfo *root,
List *restrictinfo_list,
List *reference_list);
Path *inner_path);
#endif /* RESTRICTINFO_H */