On Fri, 17 May 2019 at 21:29, Andres Freund <and...@anarazel.de> wrote: > > On 2019-05-16 14:28:03 +0100, Dean Rasheed wrote: > > 5). Some columns from pg_statistic_ext have to be made visible for > > psql \d to work. Basically, it needs to be able to query for the > > existence of extended statistics, but it doesn't need to see the > > actual statistical data. Of course, we could change psql to use the > > view, but this way gives us better backwards compatibility with older > > clients. > > > > This is still going to break compatibility of any user code looking at > > stxndistinct or stxdependencies from pg_statistic_ext, but at least it > > doesn't break old versions of psql. > > Hm, it's not normally a goal to keep old psql working against new > postgres versions. And there's plenty other issues preventing a v11 psql > to work against 12. I'd not let this guide any design decisions. >
Ah good point. In fact running "\d some_table" from v11's psql against a v12 database immediately falls over because of the removal of relhasoids from pg_class, so this isn't a valid reason for retaining access to any columns from pg_statistic_ext. Regards, Dean
