Re: array_length()

On Nov 5, 2008, at 7:00 AM, Peter Eisentraut wrote:
> 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.

What other error conditions? If we hit a real error, we should throw
an error.

Granted, there is some debate possible about what referencing an un-
defined dimension means, but I can't see how the results of that
should vary between array_length and array_lower/upper.

Is there some other corner case?
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Decibel!, aka Jim C. Nasby, Database Architect decibel(at)decibel(dot)org
Give your computer some brain candy! www.distributed.net Team #1828