Re: PoC plpgsql - possibility to force custom or generic plan

From: Daniel Gustafsson <daniel(at)yesql(dot)se>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, David Steele <david(at)pgmasters(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>
Subject: Re: PoC plpgsql - possibility to force custom or generic plan
Date: 2017-09-05 13:01:54
Message-ID: 242AAFC2-EA2F-4147-8340-2A50A29638F0@yesql.se
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> On 08 Apr 2017, at 09:42, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>
> 2017-04-08 2:30 GMT+02:00 Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com <mailto:peter(dot)eisentraut(at)2ndquadrant(dot)com>>:
> On 4/6/17 14:32, Pavel Stehule wrote:
> > I like to see any proposals about syntax or implementation.
> >
> > Using PRAGMA is one variant - introduced by PLpgSQL origin - Ada
> > language. The PRAGMA syntax can be used for PRAGMA autonomous with well
> > known syntax. It scales well - it supports function, block or command
> > level.
>
> I had pragmas implemented in the original autonomous transactions patch
> (https://www.postgresql.org/message-id/659a2fce-b6ee-06de-05c0-c8ed6a01979e@2ndquadrant.com <https://www.postgresql.org/message-id/659a2fce-b6ee-06de-05c0-c8ed6a01979e@2ndquadrant.com>).
> However, the difference there is that the behavior is lexical, specific
> to plpgsql, whereas here you are really just selecting run time
> behavior. So a GUC, and also something that could apply to other
> places, should be considered.
>
> I'll look there - we coordinate work on that.

This patch was moved to the now started commitfest, and is marked as “Needs
review”. Based on this thread I will however change it to "waiting for author”,
since there seems to be some open questions. Has there been any new work done
on this towards a new design/patch?

cheers ./daniel

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