Re: [PATCH] Equivalence Class Filters
| 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: