def __eq__(self, other):
        if type(other) != type(self):
            return False
        return True
Returns an SQL DISTINCT clause which removes duplicate rows from the
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/vistrail/operation.py/DeleteOp.__eq__--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseOperations.distinct_sql