Problems with avg on interval data type

Jeremy Blumenfeld (jeremy@horizonlive.com) reports a bug with a severity of 1
The lower the number the more severe it is.

Short Description
Problems with avg on interval data type

Long Description
We have recently upgraded from 7.0.3 to 7.1 and a query which used to work is no longer working.
The query does an avg on an interval column and now gets the error:

ERROR:  Bad interval external representation '0'

We've reproduced this problem with other tables using an interval type.  It can handle count, sum, but not avg.

Sample Code


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