Re: Removing unneeded self joins

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
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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:
The Russian Postgres Company

Attachment Content-Type Size
v15-0001-Remove-self-joins.patch text/x-patch 54.1 KB

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