Are we going to support this case now or not? After all the discussion we have had, it would be good if you could write up a summary of restrictions on what can be
used in the GROUP BY and ORDER BY clauses -- especially as they relate to what is in the SELECT clause. This will be needed so that Andrew can write proper release notes. Also, please explain whether the restrictions in the ORDER BY clause are the same or different from the restrictions on simple queries (that have no agg or GROUP BY).