From: Tom Lane <tgl@sss.pgh.pa.us>
To: Li Jin <ljin@tripadvisor.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Performance penalty when using WITH
Date: Fri, 29 Jul 2011 13:40:27 -0400
Message-ID: <28960.1311961227@sss.pgh.pa.us> (raw)
In-Reply-To: <339959BC-3A27-4269-8A3E-4C157EBABB86@tripadvisor.com>
References: <339959BC-3A27-4269-8A3E-4C157EBABB86@tripadvisor.com>
Li Jin <ljin@tripadvisor.com> writes:
> Anyone knows why the planner is doing this?
WITH is an optimization fence. This is intentional and documented.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, ljin@tripadvisor.com
Subject: Re: Performance penalty when using WITH
In-Reply-To: <28960.1311961227@sss.pgh.pa.us>
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