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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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5
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.108 2001/06/05 05:26:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.109 2001/10/18 16:11:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,6 +17,9 @@
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#ifdef OPTIMIZER_DEBUG
#include "nodes/print.h"
#endif
#include "optimizer/clauses.h"
#include "optimizer/paths.h"
#include "optimizer/planmain.h"