> A quick look at the grammar suggests that the key problem is the
> opt_timezone production --- it might be that if we removed that in
> favor of spelling out the alternatives at the call sites, the conflict
> would go away.  bison-fu is all about postponing shift/reduce decisions
> until you've seen enough to be sure ...
> 
> regards, tom lane

Yes, if we can change opt_timezone and related production rules,
it is a better choice. 
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