On Tue, Feb 21, 2017 at 01:27:53AM +0100, Tomas Vondra wrote: > On 02/21/2017 12:13 AM, Bruce Momjian wrote: > >At the risk of asking a stupid question, we already have optimizer > >statistics on expression indexes. In what sense are we using this for > >multi-variate statistics, and in what sense can't we. > > > > We're not using that at all, because those are really orthogonal features. > Even with expression indexes, the statistics are per attribute, and the > attributes are treated as independent. > > There was a proposal to also allow creating statistics on expressions > (without having to create an index), but that's not supported yet.
OK, thanks. I had to ask. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Ancient Roman grave inscription + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
