On Jan9, 2014, at 14:57 , Dean Rasheed <dean.a.rash...@gmail.com> wrote:
> On 19 December 2013 08:05, Pavel Stehule <pavel.steh...@gmail.com> wrote:
>> length should be irrelevant to fact so array starts from 1, 0 or anything
>> else
> Yes, this should just return the number of elements, and 0 for an empty array.

+1. Anything that complains about arrays whose lower bound isn't 1 really
needs a *way* less generic name than array_length(). 

> 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].


best regards,
Florian Pflug

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