Re: Planner statistics usage for composite type

Tom,

* Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
> Dmitry Lazurkin <dilaz03(at)gmail(dot)com> writes:
> > I am trying to find workaround for cross-column statistics.
> > ...
> > Worn estimate. Planner doesn't use statistics. In code I see usage of
> > function scalargtsel which returns default selectivity because
> > ROW('tag1', 0.9)::tag_sim is not Const.
>
> Yeah, that's because eval_const_expressions doesn't know how to fold
> a constant RowExpr to a simple Const. I have a patch laying about
> someplace to improve that, but I keep forgetting about it until
> we're in beta phase :-(. In the meantime you could perhaps do the
> folding by hand:

Put it into the CF..?

Thanks!

Stephen