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Re: Trouble with hashagg spill I/O pattern and costing - Mailing list pgsql-hackers

From Robert Haas
Subject Re: Trouble with hashagg spill I/O pattern and costing
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Msg-id CA+TgmoYJQ3cLbgNSPGTBNykrF3ri_LQ232QiiaC8rNNa5=47PA@mail.gmail.com
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In response to Re: Trouble with hashagg spill I/O pattern and costing  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
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On Thu, May 21, 2020 at 10:45 AM Tomas Vondra
<tomas.vondra@2ndquadrant.com> wrote:
> So the pre-allocation makes it 10x faster, and the tlist tweak makes it
> 5x faster. Not bad, I guess.

That is pretty great stuff, Tomas.

FWIW, I agree that CP_SMALL_TLIST seems like the right thing here.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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