| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Adam Brusselback <adambrusselback(at)gmail(dot)com>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Discussion on missing optimizations |
| Date: | 2017-10-08 16:18:04 |
| Message-ID: | 20171008161804.xmdc7vb22ei66sgz@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2017-10-08 11:28:09 -0400, Tom Lane wrote:
> Adam Brusselback <adambrusselback(at)gmail(dot)com> writes:
> > On another note:
> >> turning ORs into UNIONs
>
> > This is another one which would be incredibly useful for me. I've had
> > to do this manually for performance reasons far too often.
>
> Well, maybe you could sign up to help review the open patch for that then:
> https://commitfest.postgresql.org/15/1001/
>
> The reason that's not in v10 is we haven't been able to convince
> ourselves whether it's 100% correct.
Unfortunately it won't help in this specific case (no support for UNION,
just UNION ALL), but I thought it might be interesting to reference
https://medium.com/@uwdb/introducing-cosette-527898504bd6
here.
Greetings,
Andres Freund
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