On 12 October 2017 at 08:37, Kim Rose Carlsen <k...@hiper.dk> wrote: > >> Yeah. The ORDER BY creates a partial optimization fence, preventing >> any such plan from being considered. >>> > > I can see in the general case it semanticly means different things If you > allow the WHERE to pass through ORDER BY. > > A special case can be allowed for WHERE to pass the ORDER BY if the column is > part of DISTINCT ON.
Yeah, we do allow predicates to be pushed down in that case. -- David Rowley http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
