Re: [PATCH] Equivalence Class Filters

Поиск
Список
Период
Сортировка
От Jeremy Harris
Тема Re: [PATCH] Equivalence Class Filters
Дата
Msg-id 5666A86F.1040006@wizmail.org
обсуждение исходный текст
Ответ на Re: [PATCH] Equivalence Class Filters  (Simon Riggs <simon@2ndQuadrant.com>)
Ответы Re: [PATCH] Equivalence Class Filters
Список pgsql-hackers
On 07/12/15 16:44, Simon Riggs wrote:
> There are many optimizations we might adopt, yet planning time is a factor.
> It seems simple enough to ignore more complex optimizations if we have
> already achieved a threshold cost (say 10). Such a test would add nearly
> zero time for the common case. We can apply the optimizations in some kind
> of ordering depending upon the cost, so we are careful to balance the
> cost/benefit of trying certain optimizations.

Given parallelism, why not continue planning after initiating a
a cancellable execution, giving a better plan to be used if the
excecution runs for long enough?
-- 
Cheers, Jeremy





В списке pgsql-hackers по дате отправления: