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From: Tom Lane <tgl@sss.pgh.pa.us>
To: David Rowley <david.rowley@2ndquadrant.com>
Cc: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Cc: Imai Yoshikazu <yoshikazu_i443@live.jp>
Cc: jesper.pedersen@redhat.com <jesper.pedersen@redhat.com>
Cc: Imai, Yoshikazu <imai.yoshikazu@jp.fujitsu.com>
Cc: Amit Langote <amitlangote09@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Subject: Re: speeding up planning with partitions
Date: Wed, 27 Mar 2019 10:57:36 -0400
Message-ID: <18712.1553698656@sss.pgh.pa.us> (raw)
In-Reply-To: <CAKJS1f-UeJmCLeWgMdcY7Y_Tf2-ZjGFwqHSY2VENYmx2tp2uRQ@mail.gmail.com>
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	<0F97FA9ABBDBE54F91744A9B37151A512B45CD@g01jpexmbkw24>
	<53a80692-c68d-5e11-1014-6441b6e8ca5a@redhat.com>
	<BYAPR20MB22790FAFA860B03602A9A7B4BC420@BYAPR20MB2279.namprd20.prod.outlook.com>
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	<CAKJS1f9N6POxkCsq1s_Qzshz-Jmr7Jpq-eJW=ZM=U-SUCPxoMw@mail.gmail.com! >
	<ab390249-6aab-195e-bced-e7a427c3462f@lab.ntt.co.jp>
	<CAKJS1f-UeJmCLeWgMdcY7Y_Tf2-ZjGFwqHSY2VENYmx2tp2uRQ@mail.gmail.com>

David Rowley <david.rowley@2ndquadrant.com> writes:
> On Wed, 27 Mar 2019 at 18:39, Amit Langote
> <Langote_Amit_f8@lab.ntt.co.jp> wrote:
>> On 2019/03/27 14:26, David Rowley wrote:
>>> Perhaps the way to make this work, at least in the long term is to do
>>> in the planner what we did in the executor in d73f4c74dd34.

>> Maybe you meant 9ddef36278a9?

> Probably.

Yeah, there's something to be said for having plancat.c open each table
*and store the Relation pointer in the RelOptInfo*, and then close that
again at the end of planning rather than immediately.  If we can't avoid
these retail table_opens without a great deal of pain, that's the
direction I'd tend to go in.  However it would add some overhead, in
the form of a need to traverse the RelOptInfo array an additional time.

			regards, tom lane





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