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Avoid running build_index_pathkeys() in situations where there cannot

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possibly be any useful pathkeys --- to wit, queries with neither any
join clauses nor any ORDER BY request.  It's nearly free to check for
this case and it saves a useful fraction of the planning time for simple
queries.
This commit is contained in:
Tom Lane
2007-04-15 20:09:28 +00:00
parent f97d4a267a
commit fa92d21a48
3 changed files with 37 additions and 6 deletions
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src/include/optimizer/paths.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.96 2007/02/16 00:14:01 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.97 2007/04/15 20:09:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -176,5 +176,6 @@ extern int pathkeys_useful_for_ordering(PlannerInfo *root, List *pathkeys);
extern List *truncate_useless_pathkeys(PlannerInfo *root,
RelOptInfo *rel,
List *pathkeys);
extern bool has_useful_pathkeys(PlannerInfo *root, RelOptInfo *rel);
#endif /* PATHS_H */