@abstractmethod
    def concat(self, *args):
        pass
Calculate detailed appstats data for a single request.
dataset/ETHPy150Open edgewall/trac/trac/db/api.py/ConnectionBase.concat--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/appstats/ui.py/get_details_data