Received: from maia.hub.org (maia-5.hub.org [200.46.204.29]) by mail.postgresql.org (Postfix) with ESMTP id 1D3C41337BCC for ; Thu, 21 Apr 2011 14:36:30 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.29]) (amavisd-maia, port 10024) with ESMTP id 66822-01-6 for ; Thu, 21 Apr 2011 17:36:22 +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 E18D21337C0D for ; Thu, 21 Apr 2011 14:36:08 -0300 (ADT) Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp-2.01.com (Postfix) with ESMTP id D524D1AF332; Thu, 21 Apr 2011 12:36:07 -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 vorMSZKLH+Ls; Thu, 21 Apr 2011 12:36:07 -0500 (CDT) Received: by smtp-2.01.com (Postfix, from userid 99) id A81371AD5BE; Thu, 21 Apr 2011 12:36:06 -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 6E5951AEFA4; Thu, 21 Apr 2011 12:36:05 -0500 (CDT) Message-ID: <4DB06B04.4050204@agliodbs.com> Date: Thu, 21 Apr 2011 10:36:04 -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: Claudio Freire CC: Brendan Jurd , 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> 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: 201104/308 X-Sequence-Number: 43370 Claudio, > Am I missing something? Yes, prepared statements. This whole issue arises because CE is implemented purely on the planner level. The executor can treat Immutable and Stable functions as the same; the planner cannot, AFAIK. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com