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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2000-12-14 22:30:45 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2000-12-14 22:30:45 +0000 |
| commit | ea166f11462c863d91378fcbb15d4d3140002413 (patch) | |
| tree | ef157dad5b07081aae231ab9691f2ef2d5b625a4 /src/include/optimizer/pathnode.h | |
| parent | db11f4382abad09d42e784c1fa19dfbcd68038ac (diff) | |
| download | postgresql-ea166f11462c863d91378fcbb15d4d3140002413.tar.gz postgresql-ea166f11462c863d91378fcbb15d4d3140002413.zip | |
Planner speedup hacking. Avoid saving useless pathkeys, so that path
comparison does not consider paths different when they differ only in
uninteresting aspects of sort order. (We had a special case of this
consideration for indexscans already, but generalize it to apply to
ordered join paths too.) Be stricter about what is a canonical pathkey
to allow faster pathkey comparison. Cache canonical pathkeys and
dispersion stats for left and right sides of a RestrictInfo's clause,
to avoid repeated computation. Total speedup will depend on number of
tables in a query, but I see about 4x speedup of planning phase for
a sample seven-table query.
Diffstat (limited to 'src/include/optimizer/pathnode.h')
| -rw-r--r-- | src/include/optimizer/pathnode.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/optimizer/pathnode.h b/src/include/optimizer/pathnode.h index 993003eaa2f..11a6b184ebc 100644 --- a/src/include/optimizer/pathnode.h +++ b/src/include/optimizer/pathnode.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: pathnode.h,v 1.31 2000/11/12 00:37:01 tgl Exp $ + * $Id: pathnode.h,v 1.32 2000/12/14 22:30:45 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -30,6 +30,7 @@ extern Path *create_seqscan_path(RelOptInfo *rel); extern IndexPath *create_index_path(Query *root, RelOptInfo *rel, IndexOptInfo *index, List *restriction_clauses, + List *pathkeys, ScanDirection indexscandir); extern TidPath *create_tidscan_path(RelOptInfo *rel, List *tideval); extern AppendPath *create_append_path(RelOptInfo *rel, List *subpaths); |