Re: So what's an "empty" array anyway?

"David E. Wheeler" <david@kineticode.com> writes:
> On Oct 21, 2008, at 13:58, Tom Lane wrote:
>> Same as before, I think: initialize it to '{}'.  What's at stake here
>> is exactly what does that notation mean ...

> An empty, single-dimension array. But I got the impression from Simon  
> that he thought it should be NULL.

Well, we can't do that because it would clearly break too much existing
code.  '{}' has got to result in something you can successfully
concatenate more elements to.  But either the current behavior with
a zero-dimension array, or a one-dimensional length-zero array would
presumably work okay.
        regards, tom lane