On 09/16/2017 12:05 AM, Tom Lane wrote: > Andres Freund <andres@xxxxxxxxxxx> writes: >> I'm wondering if we should extend the new CREATE STATISTICS >> framework to be able to do that without requiring an index. > > I think that's already on the roadmap --- it's one of the reasons we > ended up with a SELECT-like syntax for CREATE STATISTICS. But it > didn't get done for v10. > Right. It's one of the things I'd like to be working on after getting in the more complex statistics types (MCV & histograms). > If we do look at that as a substitute for "make an expression index > just so you get some stats", it would be good to have a way to > specify that you only want the standard ANALYZE stats on that value > and not the extended ones. > Not sure I understand what you mean by "extended" - the statistics we collect for expression indexes, or the CREATE STATISTICS stuff? I assume the former, because if you don't want the latter then just don't create the statistics. Or am I missing something? regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
