Greg Stark <> writes:
> But I think I agree that it's surprising that the collate clause isn't
> working in the ORDER BY on a column produced by a UNION. Certainly
> that's where people usually want to put it.

See this ancient comment in transformSetOperationStmt:

     * For now, we don't support resjunk sort clauses on the output of a
     * setOperation tree --- you can only use the SQL92-spec options of
     * selecting an output column by name or number.  Enforce by checking that
     * transformSortClause doesn't add any items to tlist.

Perhaps sometime we ought to make an effort to relax that.

                        regards, tom lane

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