Re: Parallel Aggregates for string_agg and array_agg

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От Alvaro Herrera
Тема Re: Parallel Aggregates for string_agg and array_agg
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Msg-id 20180327002617.fjgkgxmeojfkti7b@alvherre.pgsql
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Ответ на Re: Parallel Aggregates for string_agg and array_agg  (David Rowley <david.rowley@2ndquadrant.com>)
Ответы Re: Parallel Aggregates for string_agg and array_agg  (David Rowley <david.rowley@2ndquadrant.com>)
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David Rowley wrote:

> Anyway, the options are not zero for anyone who is strongly affected
> with no other workaround. They just need to disable parallel query,
> which to me seems fairly similar to the 8.4 release note's "the
> previous behavior can be restored by disabling enable_hashagg"

synchronized_seqscans is another piece of precedent in the area, FWIW.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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