Received: from malur.postgresql.org ([217.196.149.56])
	by arkaria.postgresql.org with esmtp (Exim 4.84_2)
	(envelope-from
 <pgsql-sql-owner+M39008=pgsql+2Dsql=arkaria.postgresql.org@postgresql.org>)
	id 1cb8mr-0002mY-94
	for pgsql-sql@arkaria.postgresql.org; Tue, 07 Feb 2017 16:38:37 +0000
Received: from localhost ([127.0.0.1] helo=postgresql.org)
	by malur.postgresql.org with smtp (Exim 4.84_2)
	(envelope-from
 <pgsql-sql-owner+M39008=pgsql+2Dsql=arkaria.postgresql.org@postgresql.org>)
	id 1cb8mq-0001Mc-Po
	for pgsql-sql@arkaria.postgresql.org; Tue, 07 Feb 2017 16:38:36 +0000
Received: from makus.postgresql.org ([2001:4800:1501:1::229])
	by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256)
	(Exim 4.84_2)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1cb8lt-0000IO-KI
	for pgsql-sql@postgresql.org; Tue, 07 Feb 2017 16:37:37 +0000
Received: from sss.pgh.pa.us ([66.207.139.130])
	by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256)
	(Exim 4.84_2)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1cb8lq-0006Av-W2
	for pgsql-sql@postgresql.org; Tue, 07 Feb 2017 16:37:36 +0000
Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1])
	by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id v17GbXPL016848;
	Tue, 7 Feb 2017 11:37:33 -0500
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Herwig Goemans <herwig.goemans@gmail.com>
cc: pgsql-sql@postgresql.org
Subject: Re: why is PG NOT pushing where clause to VIEW ? Resulting in bad
 performance.
In-reply-to: 
 <CAKaDz_Eip3sG72Lj3AXd83HmotkaNMQiukxjCDk_vRYXjttyLQ@mail.gmail.com>
References: 
 <CAKaDz_Eip3sG72Lj3AXd83HmotkaNMQiukxjCDk_vRYXjttyLQ@mail.gmail.com>
Comments: In-reply-to Herwig Goemans <herwig.goemans@gmail.com>
	message dated "Tue, 07 Feb 2017 11:53:58 +0100"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <16846.1486485453.1@sss.pgh.pa.us>
Date: Tue, 07 Feb 2017 11:37:33 -0500
Message-ID: <16847.1486485453@sss.pgh.pa.us>
X-Pg-Spam-Score: -1.9 (-)
List-Archive: <http://archives.postgresql.org/pgsql-sql>
List-Help: <mailto:majordomo@postgresql.org?body=help>
List-ID: <pgsql-sql.postgresql.org>
List-Owner: <mailto:pgsql-sql-owner@postgresql.org>
List-Post: <mailto:pgsql-sql@postgresql.org>
List-Subscribe: <mailto:majordomo@postgresql.org?body=sub%20pgsql-sql>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>
X-Mailing-List: pgsql-sql
Precedence: bulk
Sender: pgsql-sql-owner@postgresql.org

Herwig Goemans <herwig.goemans@gmail.com> writes:
> I am wondering why a certain query is NOT pushing the where clause to the
> view. See query and explain plan:

There's no provision for transitively applying IN clauses to other
variables.  I'm not entirely sure whether it would be a good idea,
but in any case, it's not there and not planned.

			regards, tom lane


-- 
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql