Re: Group-count estimation statistics

Поиск
Список
Период
Сортировка
От Tom Lane
Тема Re: Group-count estimation statistics
Дата
Msg-id 22119.1107200408@sss.pgh.pa.us
обсуждение исходный текст
Ответ на Re: Group-count estimation statistics  (Manfred Koizar <mkoi-pg@aon.at>)
Ответы Re: Group-count estimation statistics
Список pgsql-hackers
Manfred Koizar <mkoi-pg@aon.at> writes:
> That's not what I meant.  I tried to say that if we have a GROUP BY
> several columns and one of these columns alone has more than N/10
> distinct values, there's no way to get less than that many groups.

Oh, I see, you want a "max" calculation in there too.  Seems reasonable.
Any objections?
        regards, tom lane


В списке pgsql-hackers по дате отправления:

Предыдущее
От: Tom Lane
Дата:
Сообщение: Re: [BUGS] Bug in create operator and/or initdb
Следующее
От: "Merlin Moncure"
Дата:
Сообщение: Re: Allow GRANT/REVOKE permissions to be applied to all schema objects with one command