Re: Performance improvement for joins where outer side is unique

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От Tom Lane
Тема Re: Performance improvement for joins where outer side is unique
Дата
Msg-id 24304.1457482780@sss.pgh.pa.us
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Ответ на Re: Performance improvement for joins where outer side is unique  (David Rowley <david.rowley@2ndquadrant.com>)
Ответы Re: 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 also notice that some regression tests, which I think some of which
> Tom updated in the upper planner changes have now changed back again
> due to the slightly reduced costs on hash and nested loop joins where
> the inner side is unique.

?? I don't see anything in this patch that touches the same queries
that changed plans in my previous patch.

I do think that the verbosity this adds to the EXPLAIN output is not
desirable at all, at least not in text mode.  Another line for every
darn join is a pretty high price.
        regards, tom lane



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