| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Peter Geoghegan <pg(at)bowt(dot)ie>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Finnerty, Jim" <jfinnert(at)amazon(dot)com>, Marcos Pegoraro <marcos(at)f10(dot)com(dot)br>, Andrey Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru>, teodor(at)sigaev(dot)ru, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org> |
| Subject: | Re: POC, WIP: OR-clause support for indexes |
| Date: | 2023-11-25 16:13:18 |
| Message-ID: | CAPpHfdsvVDEhfTK-0yZczkz0yeA=-Qd_nwe3Sbt79enRNX3c9Q@mail.gmail.com |
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On Sat, Nov 25, 2023 at 1:10 PM Alena Rybakina
<a(dot)rybakina(at)postgrespro(dot)ru> wrote:
> On 25.11.2023 04:13, Alexander Korotkov wrote:
>
> It seems to me there is a confusion. I didn't mean we need to move
> conversion of OR-expressions to ANY into choose_bitmap_and() function
> or anything like this. My idea was to avoid degradation of plans,
> which I've seen in [1]. Current code for generation of bitmap paths
> considers the possibility to split OR-expressions into distinct bitmap
> index scans. But it doesn't consider this possibility for
> ANY-expressions. So, my idea was to enhance our bitmap scan
> generation to consider split values of ANY-expressions into distinct
> bitmap index scans. So, in the example [1] and similar queries
> conversion of OR-expressions to ANY wouldn't affect the generation of
> bitmap paths.
>
> Thanks for the explanation, yes, I did not understand the idea correctly at first. I will try to implement something similar.
Alena, great, thank you. I'm looking forward to the updated patch.
------
Regards,
Alexander Korotkov
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