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 -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers