Tom Lane wrote:
> I think it's a big stretch to say that that patch fixes it, since it
> only allows an AS-less target expression to be c_expr rather than
> a_expr as it ought to.

Well, it works for a useful subset.  I remember that some other database 
did not *allow* the AS, so there were porting troubles, but I don't 
remember the details.  I'm just saying that it's doable if it's a 
necessity for someone.

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/

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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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