| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Imai Yoshikazu <yoshikazu_i443(at)live(dot)jp>, "jesper(dot)pedersen(at)redhat(dot)com" <jesper(dot)pedersen(at)redhat(dot)com>, "Imai, Yoshikazu" <imai(dot)yoshikazu(at)jp(dot)fujitsu(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: speeding up planning with partitions |
| Date: | 2019-03-27 05:49:49 |
| Message-ID: | CAKJS1f-UeJmCLeWgMdcY7Y_Tf2-ZjGFwqHSY2VENYmx2tp2uRQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, 27 Mar 2019 at 18:39, Amit Langote
<Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)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.
> What would be nice is being able to readily access Relation pointers of
> all tables accessed in a query from anywhere in the planner, whereby, a
> given table is opened only once.
Well, yeah, that's what the commit did for the executor, so it is what
I was trying to get at.
> Note that Tom complained upthread that the patch is introducing
> table_open()'s at random points within the planner, which is something to
> avoid.
Yip. :) hence my suggestion.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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