Marc-Aurèle Brothier f0eabad16d Fix GroupBy (+ having) condition and tests (#1723)
The GroupBy + having isn't used currently in the code but was not clean.
It removes unused arguments and variables and adds a test based on a DAO
to show a full example on how to use it.

Signed-off-by: Marc-Aurèle Brothier <m@brothier.org>
2017-11-09 21:01:12 +05:30
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