Re: Using multiple extended statistics for estimates

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От Tomas Vondra
Тема Re: Using multiple extended statistics for estimates
Дата
Msg-id 20191205175145.vlqw6c6h2ztiimy2@development
обсуждение исходный текст
Ответ на Re: Using multiple extended statistics for estimates  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
Ответы Re: Using multiple extended statistics for estimates  (Mark Dilger <hornschnorter@gmail.com>)
Список pgsql-hackers
On Thu, Dec 05, 2019 at 06:15:54PM +0100, Tomas Vondra wrote:
>On Sun, Dec 01, 2019 at 08:08:58PM +0100, Tomas Vondra wrote:
>>On Sat, Nov 30, 2019 at 03:01:31PM -0800, Mark Dilger wrote:
>>>
>>>Are you planning to submit a revised patch for this?
>>>
>>
>>Yes, I'll submit a rebased version of this patch shortly. I got broken
>>because of the recent fix in choose_best_statistics, shouldn't take long
>>to update the patch. I do have a couple more related patches in the
>>queue, so I want to submit them all at once.
>>
>
>OK, here we go - these two patched allow applying multiple extended
>statistics, both for MCV and functional dependencies. Functional
>dependencies are simply merged and then applied at once (so withouth
>choose_best_statistics), statistics are considered in greedy manner by
>calling choose_best_statistics in a loop.
>

OK, this time with the patches actually attached ;-)


regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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