David Fetter wrote:
> I just ran across this, and was wondering whether it's worth a
> back-patch.
New features are not back-patched.
> The interval type has an aggregate for average (AVG),
> but not one for standard deviation (STDDEV) or variance (VARIANCE).
>
> Is this a bug?
No, it's a missing feature. :-)
> Is there some problem with defining variance over
> intervals?
If all the operations that are used as part of the calculation of stddev
are available for intervals, then I don't see one.