| From: | Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | jian he <jian(dot)universality(at)gmail(dot)com> |
| Cc: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Peter Geoghegan <pg(at)bowt(dot)ie>, "Finnerty, Jim" <jfinnert(at)amazon(dot)com>, Marcos Pegoraro <marcos(at)f10(dot)com(dot)br>, 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: | 2024-02-16 05:32:36 |
| Message-ID: | 5f119769-ab11-4807-abcc-71d5dd914ea0@postgrespro.ru |
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On 16/2/2024 07:00, jian he wrote:
> On Wed, Feb 14, 2024 at 11:21 AM Andrei Lepikhov
> <a(dot)lepikhov(at)postgrespro(dot)ru> wrote:
> My OS: Ubuntu 22.04.3 LTS
> I already set the max_parallel_workers_per_gather to 10.
> So for all cases, it should use parallelism first?
>
> a better question would be:
> how to make the number of OR less than 29 still faster when
> enable_or_transformation is ON by only set parameters?
In my test environment this example gives some subtle supremacy to ORs
over ANY with only 3 ors and less.
Please, provide next EXPLAIN ANALYZE results for the case you want to
discuss here:
1. with enable_or_transformation enabled
2. with enable_or_transformation disabled
3. with enable_or_transformation disabled but with manual transformation
OR -> ANY done, to check the overhead of this optimization.
--
regards,
Andrei Lepikhov
Postgres Professional
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