Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Another approach would be to generalize what is allowable as an
> optional parameter to include a parenthesized column list, but I don't
> really think that has a lot to recommend it.
Well, maybe it's worth doing. If you believe that somebody might think
of a new per-column COPY behavior in the future, then the same issue is
going to come up again.
regards, tom lane