Josh Berkus <josh(at)agliodbs(dot)com> writes:
>> quietly removing NULL is maybe good for compatibility but is wrong for
>> functionality.
> I agree. I wasn't aware of this little misfeature.
> Default display for NULL should be a zero-length string.
That's just as broken as Pavel's suggestion. Unless you have something
that is guaranteed distingishable from the output of any non-null value,
you really can't make a significant improvement here.
regards, tom lane