| From: | Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | Yuya Watari <watari(dot)yuya(at)gmail(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Zhang Mingli <zmlpostgres(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [PoC] Reducing planning time when tables have many partitions |
| Date: | 2023-11-20 04:45:42 |
| Message-ID: | 953ffd67-863b-4bab-a424-29bff3a5100d@postgrespro.ru |
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| Lists: | pgsql-hackers |
On 27/9/2023 14:28, Yuya Watari wrote:
> Thank you for pointing it out. The ec_source_indexes and
> ec_derive_indexes are just picked up from the previous patch, and I
> have not changed their design. I think a similar approach to
> EquivalenceMembers may be applied to RestrictInfos. I will experiment
> with them and share a new patch.
During the work on committing the SJE feature [1], Alexander Korotkov
pointed out the silver lining in this work [2]: he proposed that we
shouldn't remove RelOptInfo from simple_rel_array at all but replace it
with an 'Alias', which will refer the kept relation. It can simplify
further optimizations on removing redundant parts of the query.
[1]
https://www.postgresql.org/message-id/flat/64486b0b-0404-e39e-322d-0801154901f3%40postgrespro.ru
[2]
https://www.postgresql.org/message-id/CAPpHfdsnAbg8CaK+NJ8AkiG_+_Tt07eCStkb1LOa50f0UsT5RQ@mail.gmail.com
--
regards,
Andrei Lepikhov
Postgres Professional
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