On Aug 11, 2010, at 9:36 AM, Tom Lane wrote:
>>
>> I believe those are all "", rather than '"' + undef + '"'.
>
> If you believe my previous opinion that the design center for these
> functions is arrays of numbers, then a zero-entry text[] array is what
> you want, because you can successfully cast it to a zero-entry array of
> integers or floats or whatever. Returning a single empty string will
> make those cases fail. So at the moment I'm on the side of the fence
> that says zero-entry array is the best answer.
Seems to be precedent for that:
% perl -E 'say scalar @{[ split ",", ""]}'
0
Best,
David