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Take OUTER JOIN semantics into account when estimating the size of join

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relations.  It's not very bright, but at least it now knows that
A LEFT JOIN B must produce at least as many rows as are in A ...
This commit is contained in:
Tom Lane
2001-02-16 00:03:08 +00:00
parent ca71c66190
commit b29f68f611
5 changed files with 47 additions and 11 deletions
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3
src/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: cost.h,v 1.37 2001/01/24 19:43:26 momjian Exp $
* $Id: cost.h,v 1.38 2001/02/16 00:03:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -70,6 +70,7 @@ extern void set_baserel_size_estimates(Query *root, RelOptInfo *rel);
extern void set_joinrel_size_estimates(Query *root, RelOptInfo *rel,
RelOptInfo *outer_rel,
RelOptInfo *inner_rel,
JoinType jointype,
List *restrictlist);
/*

10
src/include/optimizer/pathnode.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pathnode.h,v 1.33 2001/01/24 19:43:26 momjian Exp $
* $Id: pathnode.h,v 1.34 2001/02/16 00:03:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -66,8 +66,10 @@ extern HashPath *create_hashjoin_path(RelOptInfo *joinrel,
*/
extern RelOptInfo *get_base_rel(Query *root, int relid);
extern RelOptInfo *make_base_rel(Query *root, int relid);
extern RelOptInfo *get_join_rel(Query *root, RelOptInfo *outer_rel,
RelOptInfo *inner_rel,
List **restrictlist_ptr);
extern RelOptInfo *get_join_rel(Query *root,
RelOptInfo *outer_rel,
RelOptInfo *inner_rel,
JoinType jointype,
List **restrictlist_ptr);
#endif /* PATHNODE_H */