Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id 5F90C1337BCC for ; Wed, 20 Apr 2011 23:18:31 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 97438-09 for ; Thu, 21 Apr 2011 02:18:24 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from smtp-2.01.com (smtp-2.01.com [38.102.63.181]) by mail.postgresql.org (Postfix) with ESMTP id 17FF91337BB7 for ; Wed, 20 Apr 2011 23:18:24 -0300 (ADT) Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp-2.01.com (Postfix) with ESMTP id 8B8331AF5BE; Wed, 20 Apr 2011 21:18:24 -0500 (CDT) Received: from smtp-2.01.com ([127.0.0.1]) by localhost (smtp-2.01.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ve8wxX1+witr; Wed, 20 Apr 2011 21:18:24 -0500 (CDT) Received: by smtp-2.01.com (Postfix, from userid 99) id 717F21AF5C5; Wed, 20 Apr 2011 21:18:24 -0500 (CDT) Received: from Sidney-Stratton.local (70-36-143-243.dsl.dynamic.sonic.net [70.36.143.243]) by smtp-2.01.com (Postfix) with ESMTPSA id 185DD1AF5BE; Wed, 20 Apr 2011 21:18:24 -0500 (CDT) Message-ID: <4DAF93EF.5070102@agliodbs.com> Date: Wed, 20 Apr 2011 19:18:23 -0700 From: Josh Berkus Organization: PostgreSQL Experts Inc. User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 MIME-Version: 1.0 To: Brendan Jurd CC: Tom Lane , pgsql-performance@postgresql.org Subject: Re: Constraint exclusion can't process simple constant expressions? References: <4DAF70FD.7000609@agliodbs.com> <26139.1303346929@sss.pgh.pa.us> <4DAF8F60.9050407@agliodbs.com> <4DAF92B3.60806@agliodbs.com> In-Reply-To: X-Enigmail-Version: 1.1.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.9 tagged_above=-10 required=5 tests=BAYES_00=-1.9 X-Spam-Level: X-Archive-Number: 201104/290 X-Sequence-Number: 43352 > You may be thinking of the STABLE volatility level. It requires that > the results of the function are the same for the same inputs, within > the same transaction. Right. But CE will only pay attention to immutable values, not stable ones, AFAICT. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com