Bruce Momjian <[EMAIL PROTECTED]> writes:
> Well, it can be an expression _if_ the expression _matches_ an existing
> UNION column.

You're mistaken.  It has to be *an output column name*.  Not anything else.

                        regards, tom lane

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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