> In a quick glance this code seems close to completely brain dead :-(
> For one thing, why isn't it making separate determinations about whether
> the left and right inputs of the UNION (resp INTERSECT or EXCEPT)
> operator need to be parenthesized? After that maybe we could figure out
> what the individual decisions need to be.
Well it's the work of 5 seconds to have two separate tests. What I
don't feel confident in doing is getting the tests themselves right.
That's why I can't really do it...
