> > > 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 :)
- Tom