Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id 7AEF5B5D91F for ; Thu, 3 Nov 2011 08:01:00 -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 96061-08 for ; Thu, 3 Nov 2011 11:00:54 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0-rc2 Received: from mail-vw0-f46.google.com (mail-vw0-f46.google.com [209.85.212.46]) by mail.postgresql.org (Postfix) with ESMTP id 0DF5BB5DC52 for ; Thu, 3 Nov 2011 08:00:53 -0300 (ADT) Received: by vws1 with SMTP id 1so709145vws.19 for ; Thu, 03 Nov 2011 04:00:54 -0700 (PDT) Received: by 10.52.177.3 with SMTP id cm3mr8536112vdc.89.1320311248070; Thu, 03 Nov 2011 02:07:28 -0700 (PDT) Received: from ayaki.localdomain (58-7-142-223.dyn.iinet.net.au. [58.7.142.223]) by mx.google.com with ESMTPS id el1sm7075542vdc.13.2011.11.03.02.07.24 (version=SSLv3 cipher=OTHER); Thu, 03 Nov 2011 02:07:26 -0700 (PDT) Message-ID: <4EB259C9.5020102@ringerc.id.au> Date: Thu, 03 Nov 2011 17:07:21 +0800 From: Craig Ringer User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 MIME-Version: 1.0 To: Igor Neyman CC: Robert Haas , Tom Lane , Jay Levitt , pgsql-performance@postgresql.org Subject: Re: Guide to PG's capabilities for inlining, predicate hoisting, flattening, etc? References: <29918.1320244719@sss.pgh.pa.us> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: 201111/39 X-Sequence-Number: 45550 On 11/03/2011 04:22 AM, Igor Neyman wrote: > Hints.... here we come :) Pfft! No more than `VOLATILE' vs `STABLE' vs `IMMUTABLE'. It's a semantic difference, not just a performance hint. That said, I'm not actually against performance hints if done sensibly. -- Craig Ringer