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pgsql/src backend/nodes/print.c backend/optimi ...

From: tgl(at)postgresql(dot)org
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql/src backend/nodes/print.c backend/optimi ...
Date: 2001-10-18 16:11:42
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Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql
Changes by:	tgl(at)postgresql(dot)org	01/10/18 12:11:42

Modified files:
	src/backend/nodes: print.c 
	src/backend/optimizer: README 
	src/backend/optimizer/path: allpaths.c joinrels.c pathkeys.c 
	src/backend/optimizer/plan: initsplan.c planner.c 
	src/backend/optimizer/util: relnode.c 
	src/include/optimizer: paths.h 

Log message:
	Extend code that deduces implied equality clauses to detect whether a
	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.

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