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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-09-23 23:50:47 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-09-23 23:50:47 +0000 |
| commit | 730e2ffebc98977366ec717a0f89345425e02eb1 (patch) | |
| tree | 7ac97764d3e565d7e9a67969d1e742dde6c8856f /src/include/optimizer/paths.h | |
| parent | 783af51cb1fc27218bec7137c7a138eefb1d76e4 (diff) | |
Back-patch code to deduce implied equalities from transitivity of
mergejoin clauses, and add these equalities to the given WHERE clauses.
This is necessary to ensure that sort keys we think are equivalent
really are equivalent as soon as their rels have been joined. Without
this, 7.0 may create an incorrect mergejoin plan.
Diffstat (limited to 'src/include/optimizer/paths.h')
| -rw-r--r-- | src/include/optimizer/paths.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h index 0a2f56db63a..0c45fc897f1 100644 --- a/src/include/optimizer/paths.h +++ b/src/include/optimizer/paths.h @@ -8,7 +8,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: paths.h,v 1.44 2000/04/12 17:16:42 momjian Exp $ + * $Id: paths.h,v 1.44.2.1 2000/09/23 23:50:46 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -90,6 +90,7 @@ typedef enum } PathKeysComparison; extern void add_equijoined_keys(Query *root, RestrictInfo *restrictinfo); +extern void generate_implied_equalities(Query *root); extern List *canonicalize_pathkeys(Query *root, List *pathkeys); extern PathKeysComparison compare_pathkeys(List *keys1, List *keys2); extern bool pathkeys_contained_in(List *keys1, List *keys2); |