Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics

Поиск
Список
Период
Сортировка
От Gregory Stark
Тема Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics
Дата
Msg-id 87prqpmwbg.fsf@oxford.xeocode.com
обсуждение исходный текст
Ответ на Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics  (Zeugswetter Andreas OSB sIT <Andreas.Zeugswetter@s-itsolutions.at>)
Ответы Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics
Список pgsql-hackers
Дерево обсуждения 
"Zeugswetter Andreas OSB sIT" <Andreas.Zeugswetter@s-itsolutions.at> writes:

> I think for low ndistinct values we will want to know the exact
> value + counts and not a bin. So I think we will want additional stats rows
> that represent "value 'a1' stats".

Isn't that what our most frequent values list does?

--  Gregory Stark EnterpriseDB          http://www.enterprisedb.com Ask me about EnterpriseDB's Slony Replication
support!

В списке pgsql-hackers по дате отправления:

Предыдущее
От: Gregory Stark
Дата:
Сообщение: Re: Overhauling GUCS
Следующее
От: Zeugswetter Andreas OSB sIT
Дата:
Сообщение: Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics