Am Dienstag, 24. April 2007 19:48 schrieb Tom Lane:
> You're missing the point, which is that the inner UNION needs to decide
> what its uniqueness semantics are, independently of what might happen to
> its result later. Or that's how I read the spec anyway.
It's probably safer to leave it as is. Maybe there could be a way to make the
error message more understandable ("Where did the 'text' come from?"), but
perhaps the additional detail discussed in the other thread will do that.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/