Neil Conway <[EMAIL PROTECTED]> writes:
> Can you see a better fix?

I haven't done any experimentation, but my first instinct would be to
spell out the productions at greater length: instead of 

        relation_expr opt_as ColId


        relation_expr ColId
        | relation_expr AS ColId

The normal game with bison is to postpone decisions (reductions) as
long as possible.  Shortcuts like opt_as lose that game because the
shift-versus-reduce decision has to be made with hardly any lookahead.

Or maybe some other hack is needed, but I seriously doubt it's

                        regards, tom lane

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