Received: from malur.postgresql.org ([217.196.149.56])
	by arkaria.postgresql.org with esmtps
 (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256)
	(Exim 4.89)
	(envelope-from <pgsql-committers-owner+archive@lists.postgresql.org>)
	id 1eojXK-0001l3-Rc
	for pgsql-committers@arkaria.postgresql.org; Thu, 22 Feb 2018 05:35:18 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.84_2)
	(envelope-from <pgsql-committers-owner+archive@lists.postgresql.org>)
	id 1eojXJ-0000hS-Fn
	for pgsql-committers@arkaria.postgresql.org; Thu, 22 Feb 2018 05:35:17 +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 1eojXJ-0000eS-7s
	for pgsql-committers@lists.postgresql.org; Thu, 22 Feb 2018 05:35:17 +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 4.89)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1eojXG-0006NE-AO; Thu, 22 Feb 2018 05:35:15 +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 w1M5ZDZk025381;
	Thu, 22 Feb 2018 00:35:13 -0500
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <rhaas@postgresql.org>
cc: pgsql-committers@postgresql.org
Subject: Re: pgsql: Charge cpu_tuple_cost * 0.5 for Append and MergeAppend
 nodes.
In-reply-to: <E1eoiDC-00083t-GD@gemulon.postgresql.org>
References: <E1eoiDC-00083t-GD@gemulon.postgresql.org>
Comments: In-reply-to Robert Haas <rhaas@postgresql.org>
	message dated "Thu, 22 Feb 2018 04:10:26 +0000"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <25379.1519277713.1@sss.pgh.pa.us>
Date: Thu, 22 Feb 2018 00:35:13 -0500
Message-ID: <25380.1519277713@sss.pgh.pa.us>
List-Id: <pgsql-committers.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-committers@lists.postgresql.org>
List-Owner: <mailto:pgsql-committers-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-committers>
Precedence: bulk

Robert Haas <rhaas@postgresql.org> writes:
> Charge cpu_tuple_cost * 0.5 for Append and MergeAppend nodes.

This seems to have produced some plan instability in the buildfarm.

			regards, tom lane