Re: Hybrid Hash/Nested Loop joins and caching results from subplans

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От David Rowley
Тема Re: Hybrid Hash/Nested Loop joins and caching results from subplans
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Msg-id CAApHDvpDb5XDSDQJWT8DbY8TL+PVbozRaEyXxi8wzJOuN-jEgA@mail.gmail.com
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Ответ на Re: Hybrid Hash/Nested Loop joins and caching results from subplans  (Thomas Munro <thomas.munro@gmail.com>)
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Thanks for chipping in here.

On Mon, 31 Aug 2020 at 17:57, Thomas Munro <thomas.munro@gmail.com> wrote:
> I wonder what it would take to overcome the overheads of the separate
> Result Cache node, with techniques to step out of the way or something
> like that.

So far it looks like there are more overheads to having the caching
done inside nodeNestloop.c. See [1].  Perhaps there's something that
can be done to optimise away the needless MinimalTuple deform that I
mentioned there, but for now, performance-wise, we're better off
having a separate node.

David

[1] https://www.postgresql.org/message-id/CAApHDvo2acQSogMCa3hB7moRntXWHO8G+WSwhyty2+c8vYRq3A@mail.gmail.com



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