def clear(self):
        self.__values.clear()
        self.__contexts = []
Returns the maximum number of items that can be passed in a single 'IN'
dataset/ETHPy150Open manahl/mdf/mdf/builders/basic.py/FinalValueCollector.clear--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/backends/__init__.py/BaseDatabaseOperations.max_in_list_size