On Wed, Jan 6, 2016 at 12:08 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> konstantin knizhnik <k.knizh...@postgrespro.ru> writes: > > 1. The cost compared in grouping_planner doesn't take in account price > of get_authorized_users - it is not changed when I am altering function > cost. Is it correct behavior? > > The general problem of accounting for tlist eval cost is not handled very > well now, but especially not with respect to the idea that different paths > might have different tlist costs. I'm working on an upper-planner rewrite > which should make this better, or at least make it practical to make it > better. > Hmm... Besides costing it would be nice to postpone calculation of expensive tlist functions after LIMIT. ------ Alexander Korotkov Postgres Professional: http://www.postgrespro.com The Russian Postgres Company
