| From: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
|---|---|
| To: | Richard Guo <guofenglinux(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Richard Guo <riguo(at)pivotal(dot)io>, Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Amit Langote <amitlangote09(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: A problem about partitionwise join |
| Date: | 2020-04-09 14:06:28 |
| Message-ID: | CAExHW5t6sXYM0Hx_22PPV7AjVFAwTDTxnycfLAc83rJnYVMWZQ@mail.gmail.com |
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| Lists: | Postg배트맨 토토SQL |
>
> I think it would not work for outer joins if we only check
> exprs_known_equal() for equivalences. If the equi-join conditions
> involving pairs of matching partition keys are outer join quals
> mentioning nonnullable side rels, they would not exist in any EC
> according to the current EC infrastructure. So we still have to look
> through restrictlist.
>
When I wrote that function and even today, EC didn't accommodate outer
join equality conditions. If we can somehow do that,
have_partkey_equi_join() can be completely eliminated.
--
Best Wishes,
Ashutosh Bapat
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