On 1/9/14, 2:57 PM, Dean Rasheed wrote:
> Yes, this should just return the number of elements, and 0 for an empty array.
>
> How it should behave for multi-dimensional arrays is less clear, but
> I'd argue that it should return the total number of elements, i.e.
> cardinality('{{1,2},{3,4}}'::int[][]) = 4. That would make it
> consistent with the choices we've already made for unnest() and
> ordinality:
> - cardinality(foo) = (select count(*) from unnest(foo)).
> - unnest with ordinality would always result in ordinals in the range
> [1, cardinality].
Ignoring my proposal, this seems like the most reasonable option. I'll
send an updated patch along these lines.
Regards,
Marko Tiikkaja
