> > > > What does 'select null order by 1;' do now?
> > you can do a NULL test there and prevent oper() from even being
> > called.
>
> postgres=> select null order by 1;
> ?column?
> --------
>
> (1 row)
>
> There are three or four cases in transformSortClause() and I had fixed
> only one case for UNION. A second case is now fixed, in the same way; I
> assigned INT4OID to the column type for the "won't actually happen"
> sort. Didn't want to skip the code entirely, since the backend needs to
> _try_ a sort to get the NULLs right. I'm not certain under what
> circumstances the other cases are invoked; will try some more testing...
>
> Off to work now :)
Good. Yes, I agree we need to put something in that place.
--
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