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

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