Re: [HACKERS] Performance improvement for joins where outer side is unique

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От Tom Lane
Тема Re: [HACKERS] Performance improvement for joins where outer side is unique
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Msg-id 2414.1485459257@sss.pgh.pa.us
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Ответ на Re: [HACKERS] Performance improvement for joins where outer side is unique  (David Rowley <david.rowley@2ndquadrant.com>)
Ответы Re: [HACKERS] Performance improvement for joins where outer side is unique  (David Rowley <david.rowley@2ndquadrant.com>)
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David Rowley <david.rowley@2ndquadrant.com> writes:
> I've attached a version without outer unique.

I looked through this a bit, and the first thing I noticed was it doesn't
touch costsize.c at all.  That seems pretty wrong; it's little help to
have a performance improvement if the planner won't pick the right plan
type.  There were costsize.c changes in there back in April; what happened
to them?
        regards, tom lane

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