So in:
$ ./scripts/csv.py input.csv -fa='b?c:d'
c and d must have matching types or else an error is raised.
This requires an explicit definition for the ternary operator since it's
a special case in that the type of b does not matter.
Compare to a 3-arg max call:
$ ./scripts/csv.py input.csv -fa='int(b)?float(c):float(d)' # ok
$ ./scripts/csv.py input.csv -fa='max(int(b),float(c),float(d))' # error
Christopher Haster
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