Neil Conway <neilc(at)samurai(dot)com> 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
try
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
unfixable.
regards, tom lane