| From: | Alexander Kuzmenkov <a(dot)kuzmenkov(at)postgrespro(dot)ru> |
|---|---|
| To: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Removing unneeded self joins |
| Date: | 2019-03-25 15:13:24 |
| Message-ID: | fa5ce779-2200-702f-85ec-780f1769cd66@postgrespro.ru |
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| Thread: | |
| Lists: | pgsql-hackers |
I noticed you lost a couple of test cases in v14, so I added them back.
I also added a case where your implementation returns a different number
of rows compared to vanilla:
select * from sl t1, sl t2 where t1.a = t2.a and t1.b = 1;
Please see the attached v15.
--
Alexander Kuzmenkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
| Attachment | Content-Type | Size |
|---|---|---|
| v15-0001-Remove-self-joins.patch | text/x-patch | 54.1 KB |
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