Joe Conway wrote:
Actually, consistent with my last post, I think array_upper() on a zero-element array should return NULL. A zero-element array has a defined lower bound, but its upper bound is not zero -- it is really undefined.

Just to clarify my response, this is what I propose:

regression=# select array_upper('[2][1:]={{},{}}'::int[],1);
 array_upper
-------------
           2
(1 row)

regression=# select array_upper('[2][1:]={{},{}}'::int[],2) IS NULL;
 ?column?
----------
 t
(1 row)


Joe

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