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Extend code that deduces implied equality clauses to detect whether a

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clause being added to a particular restriction-clause list is redundant
with those already in the list.  This avoids useless work at runtime,
and (perhaps more importantly) keeps the selectivity estimation routines
from generating too-small estimates of numbers of output rows.
Also some minor improvements in OPTIMIZER_DEBUG displays.
This commit is contained in:
Tom Lane
2001-10-18 16:11:42 +00:00
parent 5045004958
commit 6254465d06
9 changed files with 373 additions and 110 deletions
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4
src/backend/optimizer/path/pathkeys.c
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@ -11,7 +11,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/pathkeys.c,v 1.32 2001/03/22 06:16:14 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/pathkeys.c,v 1.33 2001/10/18 16:11:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -705,7 +705,7 @@ make_pathkeys_for_sortclauses(List *sortclauses,
* This is a worthwhile savings because these routines will be invoked
* many times when dealing with a many-relation query.
*/
static void
void
cache_mergeclause_pathkeys(Query *root, RestrictInfo *restrictinfo)
{
Node *key;