def __init__(self, query, on, left_on, right_on, join_type, prefix):
    self._query = query
    self._on = util.parse_features(on)
    self._left_on = util.parse_features(left_on)
    self._right_on = util.parse_features(right_on)
    self._join_type = (join_type or self.INNER)
    self._prefix = prefix
def __init__(self, query, on, left_on, right_on, join_type, prefix):
    self._query = query
    self._on = util.parse_features(on)
    self._left_on = util.parse_features(left_on)
    self._right_on = util.parse_features(right_on)
    self._join_type = (join_type or self.INNER)
    self._prefix = prefix