Re: Extremely slow HashAggregate in simple UNION query

Michael Lewis <[email protected]> Tue, 20 Aug 2019 10:19:05 -0600

Newsgroups	gmane.comp.db.postgresql.performance
Message-ID	<CAHOFxGrYcwp9aoC1RXnG0svZo--MpyUvrSBD503TXsefaLd-rg@mail.gmail.com>

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.

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