Re: [HACKERS] Runtime Partition Pruning

From: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Beena Emerson <memissemerson(at)gmail(dot)com>, amul sul <sulamul(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>
Subject: Re: [HACKERS] Runtime Partition Pruning
Date: 2018-04-09 18:48:05
Message-ID: 20180409184805.ieucnlxwnwr2mprt@alvherre.pgsql
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Robert Haas wrote:
> On Mon, Apr 9, 2018 at 2:28 PM, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> > Robert Haas wrote:

> >> I don't get this. The executor surely had to (and did) open all of
> >> the relations somewhere even before this patch.
> >
> > I was worried that this coding could be seen as breaking modularity, or
> > trying to do excessive work. However, after looking closer at it, it
> > doesn't really look like it's the case. So, nevermind.
>
> Well what I'm saying is that it shouldn't be necessary. If the
> relations are being opened already and the pointers to the relcache
> entries are being saved someplace, you shouldn't need to re-open them
> elsewhere to get pointers to the relcache entries.

Oh, okay. I can look into that.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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