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pgsql-server/src/backend/optimizer/path indxpath.c

From: tgl(at)svr1(dot)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql-server/src/backend/optimizer/path indxpath.c
Date: 2004-01-07 22:02:48
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Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl(at)svr1(dot)postgresql(dot)org	04/01/07 18:02:48

Modified files:
	src/backend/optimizer/path: indxpath.c 

Log message:
	Make some improvements in the intelligence of the partial-index
	predicate tester.  It can now deal with commuted clauses (for
	instance, 4 < x implies x > 3), subclauses more complicated than
	a simple Var (for example, upper(x) = 't' implies upper(x) > 'a'),
	and <> operators (for example, x < 3 implies x <> 4).  Still
	only understands operators associated with btree opclasses, though.
	Inspired by example from Martin Hampl.

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