> > > I updated the patch to cover semi and anti joins with eqjoinsel_semi().
> > > I think it is better than returning a constant.
> >
> > What you did there is utterly unacceptable from a modularity standpoint;
> > and considering that the values will be nowhere near right, the argument
> > that "it's better than returning a constant" seems pretty weak. I think
> > you should just take that out again.
>
> I will try to come up with a better, data type specific implementation
> in a week.
New version with semi join estimation function attached.
