Re: accounting for memory used for BufFile during hash joins

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От Tom Lane
Тема Re: accounting for memory used for BufFile during hash joins
Дата
Msg-id 27902.1557199108@sss.pgh.pa.us
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Ответ на Re: accounting for memory used for BufFile during hash joins  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
Ответы Re: accounting for memory used for BufFile during hash joins  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
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Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> Do we actually check how many duplicates are there during planning?

Certainly that's part of the planner's cost estimates ... but it's
only as good as the planner's statistical knowledge.

            regards, tom lane

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