| From: | Andrey Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | Hywel Carver <hywel(at)skillerwhale(dot)com> |
| Cc: | Konstantin Knizhnik <knizhnik(at)garret(dot)ru>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, David Rowley <dgrowleyml(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Removing unneeded self joins |
| Date: | 2021-05-07 07:23:00 |
| Message-ID: | e241df57-9dc7-d8fb-b870-68ecead56822@postgrespro.ru |
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| Lists: | pgsql-hackers |
On 12/3/21 14:05, Hywel Carver wrote:
> I've built and tested this, and it seems to function correctly to me. One question I have is whether the added "IS NOT NULL" filters can be omitted when they're unnecessary. Some of the resulting plans included an "IS NOT NULL" filter on a non-nullable column. To be clear, this is still an improvement (to me) without that.
New version of the feature. Deeply refactored with main goal - to reduce
the code size) and rebased on current master.
Here I didn't work on 'unnecessary IS NOT NULL filter'.
--
regards,
Andrey Lepikhov
Postgres Professional
| Attachment | Content-Type | Size |
|---|---|---|
| v26-0001-Remove-self-joins.patch | text/plain | 61.3 KB |
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