From: Tom Lane <tgl@sss.pgh.pa.us>
To: David Rowley <david.rowley@2ndquadrant.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Stephen Frost <sfrost@snowman.net>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Parallel Aggregates for string_agg and array_agg
Date: Tue, 27 Mar 2018 10:58:14 -0400
Message-ID: <13700.1522162694@sss.pgh.pa.us> (raw)
In-Reply-To: <CAKJS1f-1zxwY9-jWwdB47+24NwbUzgWAOAGhECnvQKSDXRP_wg@mail.gmail.com>
References: <CAKJS1f-Qcv2FiUHKCS_2OT3Gb3bOW_yZw9mKSCj=SDwYMH85hA@mail.gmail.com>
<20180327002617.fjgkgxmeojfkti7b@alvherre.pgsql>
<CAKJS1f-1zxwY9-jWwdB47+24NwbUzgWAOAGhECnvQKSDXRP_wg@mail.gmail.com>
David Rowley <david.rowley@2ndquadrant.com> writes:
> On 27 March 2018 at 13:26, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>> synchronized_seqscans is another piece of precedent in the area, FWIW.
> This is true. I guess the order of aggregation could be made more
> certain if we remove the cost based optimiser completely, and just
> rely on a syntax based optimiser.
None of this is responding to my point. I think the number of people
who actually don't care about aggregation order for these aggregates
is negligible, and none of you have argued against that; you've instead
selected straw men to attack.
regards, tom lane
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, david.rowley@2ndquadrant.com, alvherre@alvh.no-ip.org, sfrost@snowman.net, tomas.vondra@2ndquadrant.com, andres@anarazel.de
Subject: Re: Parallel Aggregates for string_agg and array_agg
In-Reply-To: <13700.1522162694@sss.pgh.pa.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox