| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Amit Langote <amitlangote09(at)gmail(dot)com> |
| Cc: | David Rowley <dgrowleyml(at)gmail(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Yuya Watari <watari(dot)yuya(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, jian he <jian(dot)universality(at)gmail(dot)com>, Alena Rybakina <lena(dot)ribackina(at)yandex(dot)ru>, Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru>, Thom Brown <thom(at)linux(dot)com>, Zhang Mingli <zmlpostgres(at)gmail(dot)com> |
| Subject: | Re: [PoC] Reducing planning time when tables have many partitions |
| Date: | 2025-04-09 05:19:45 |
| Message-ID: | 129572.1744175985@sss.pgh.pa.us |
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Amit Langote <amitlangote09(at)gmail(dot)com> writes:
> Should the following paragraph in src/backend/optimizer/README be
> updated to reflect the new reality after recent changes?
> An EquivalenceClass can contain "em_is_child" members, which are copies
> of members that contain appendrel parent relation Vars, transposed to
> contain the equivalent child-relation variables or expressions.
Hm. They still are "in" the EquivalenceClass in a very real sense;
there is no other data structure that links to them. So this isn't
incorrect. I do get your feeling that maybe some rewording is
warranted, but I'm not sure what.
regards, tom lane
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