def del_shared(self, obj_type, obj_id, share_id='', share_type='global'):
    col_name = ('%s:%s:%s' % (share_type, share_id, obj_id))
    self._cassandra_driver.remove(cf_name=datastore_api.OBJ_SHARED_CF_NAME, key=obj_type, columns=[col_name])
def del_shared(self, obj_type, obj_id, share_id=, share_type='global'):
    col_name = ('%s:%s:%s' % (share_type, share_id, obj_id))
    self._cassandra_driver.remove(cf_name=datastore_api.OBJ_SHARED_CF_NAME, key=obj_type, columns=[col_name])