Re: Extremely slow HashAggregate in simple UNION query
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Subject
: Re: Extremely slow HashAggregate in simple UNION query
From
: Michael Lewis <mlewis@xxxxxxxxxxx>
Date
: Tue, 20 Aug 2019 10:19:05 -0600
Cc
: postgres performance list <pgsql-performance@xxxxxxxxxxxxxx>
In-reply-to
: <
9ADCDD19-555B-4DB0-B00C-1852AC361557@felixge.de
>
References
: <
9ADCDD19-555B-4DB0-B00C-1852AC361557@felixge.de
>
I believe this would be relevant-
https://www.cybertec-postgresql.com/en/optimizer-support-functions/
It seems there is hope down the road to improve those estimates.
References
:
Extremely slow HashAggregate in simple UNION query
From:
Felix Geisendörfer
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