| From: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru> |
|---|---|
| To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
| 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 11:10:18 |
| Message-ID: | 8bc8369b-482f-44f9-8455-73bd1c11f494@postgrespro.ru |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
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.
--
Regards,
Alena Rybakina
Postgres Professional
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Amit Kapila | 2023-11-25 12:20:35 | Re: pg_upgrade and logical replication |
| Previous Message | Amit Kapila | 2023-11-25 11:05:23 | Re: undetected deadlock in ALTER SUBSCRIPTION ... REFRESH PUBLICATION |