2016-09-29 20:49 GMT+02:00 Sven R. Kunze <srku...@mail.de>: > On 29.09.2016 20:12, Pavel Stehule wrote: > >> In ideal world then plan should be independent on used form. The most >> difficult is safe estimation of OR predicates. With correct estimation the >> transformation to UNION form should not be necessary I am think. >> > > Ah, okay. That's interesting. > > So how can I help here? >
try to write a patch :) or better, help with enhancing PostgreSQL's estimation model. Tomas Vondra is working 2 years on multicolumn statistics. He needs help with review. Regards Pavel > > Regards, > Sven > > > > -- > Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance >
