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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-01-20 20:45:41 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-01-20 20:45:41 +0000 |
| commit | f41803bb39bc2949db200116a609fd242d0ec221 (patch) | |
| tree | 2c81bcf712ab8b46133c2f50bbee34b2b3ea7129 /src/include/optimizer/restrictinfo.h | |
| parent | 2b7334d4877ba445003f96b0bb7eed4e7078a39b (diff) | |
| download | postgresql-f41803bb39bc2949db200116a609fd242d0ec221.tar.gz | |
Refactor planner's pathkeys data structure to create a separate, explicit
representation of equivalence classes of variables. This is an extensive
rewrite, but it brings a number of benefits:
* planner no longer fails in the presence of "incomplete" operator families
that don't offer operators for every possible combination of datatypes.
* avoid generating and then discarding redundant equality clauses.
* remove bogus assumption that derived equalities always use operators
named "=".
* mergejoins can work with a variety of sort orders (e.g., descending) now,
instead of tying each mergejoinable operator to exactly one sort order.
* better recognition of redundant sort columns.
* can make use of equalities appearing underneath an outer join.
Diffstat (limited to 'src/include/optimizer/restrictinfo.h')
| -rw-r--r-- | src/include/optimizer/restrictinfo.h | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/src/include/optimizer/restrictinfo.h b/src/include/optimizer/restrictinfo.h index 619e7cef39..272c5a6703 100644 --- a/src/include/optimizer/restrictinfo.h +++ b/src/include/optimizer/restrictinfo.h @@ -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/restrictinfo.h,v 1.39 2007/01/05 22:19:56 momjian Exp $ + * $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.40 2007/01/20 20:45:40 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -32,12 +32,8 @@ extern List *extract_actual_clauses(List *restrictinfo_list, extern void extract_actual_join_clauses(List *restrictinfo_list, List **joinquals, List **otherquals); -extern List *remove_redundant_join_clauses(PlannerInfo *root, - List *restrictinfo_list, - bool isouterjoin); extern List *select_nonredundant_join_clauses(PlannerInfo *root, List *restrictinfo_list, - List *reference_list, - bool isouterjoin); + List *reference_list); #endif /* RESTRICTINFO_H */ |