Re: Proposed patch to make mergejoin cost estimation more symmetric

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От Tom Lane
Тема Re: Proposed patch to make mergejoin cost estimation more symmetric
Дата
Msg-id 19574.1197038922@sss.pgh.pa.us
обсуждение исходный текст
Ответ на Re: Proposed patch to make mergejoin cost estimation more symmetric  (Simon Riggs <simon@2ndquadrant.com>)
Ответы Re: Proposed patch to make mergejoin cost estimation more symmetric  (Alvaro Herrera <alvherre@alvh.no-ip.org>)
Re: Proposed patch to make mergejoin cost estimation more symmetric  (Simon Riggs <simon@2ndquadrant.com>)
Список pgsql-patches
Дерево обсуждения 
Simon Riggs <simon@2ndquadrant.com> writes:
> I do have a longer term issue that there is no information provided by
> EXPLAIN to allow us to differentiate these two conditions.

Sure there is: the new startup condition affects the estimated plan
startup cost (only) and the existing termination condition affects the
estimated total cost (only).

            regards, tom lane

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