Re: array_length()

Hello

2008/11/5 Peter Eisentraut <peter_e@gmx.net>:
> Decibel! wrote:
>>
>> ISTM it'd be useful to have an array_length function (since I just wrote
>> one for work ;), so here's a patch. Note that I don't have the docs
>> toolchain setup, so I wasn't able to test the doc patches.
>
> There is a tiny problem with this implementation: It returns null for an
> empty array, not zero.  This is because array_lower and/or array_upper
> return null for an empty array, which makes sense for those cases.  We could
> fix this by putting a coalesce around the expression, but since the array
> functions return null for all kinds of error cases, this might mask other
> problems.  Or we move to a C implementation.
>

we should to write function isempty(anyarray), that returns true when
param is empty.

regards
Pavel Stehule




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