def combine_expression(self, connector, sub_expressions):
        conn = ' %s ' % connector
        return conn.join(sub_expressions)
Return the appropriate SQL for the given object, typecast
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseOperations.combine_expression--crossover with--dataset/ETHPy150Open lukesneeringer/django-pgfields/django_pg/models/fields/composite/adapter.py/CompositeAdapter.getquoted