| 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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| Lists: | pgsql-hackers |
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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