|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|
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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'.
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