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: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Removing unneeded self joins
Date: 2018-07-27 12:26:03
Message-ID: 8a17cc3d-f933-ba32-6110-f2d8481070e7@postgrespro.ru
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Here is a current version of the patch, still rather experimental. Since
the previous version, I fixed some bugs and added the possibility to
remove a relation even when it is mentioned in target lists. I have to
rewrite all references to the removed relation in targetlists and the
equivalence classes, so that they point to the remaining relation. I
change RestrictInfos in place, and update attr_needed and reltarget of
the remaining relation. I also update equivalence members, and delete
equivalence classes that become single-member.

I'm posting it a single file now, because all meaningful changes are in
analyzejoins.c anyway.

--
Alexander Kuzmenkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

Attachment Content-Type Size
0001-Remove-unique-self-joins-v3.patch text/x-patch 47.8 KB

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