select, for columns that are calculated to be "equivalent"
based on the join criterion of this :class:`Join`. This will
recursively apply to any joins directly nested by this one
- as well. This flag is specific to a particular use case
- by the ORM and is deprecated as of 0.6.
:param \**kwargs: all other kwargs are sent to the
underlying :func:`select()` function.
- from sqlalchemy.sql import util as sql_util
- util.warn_deprecated("fold_equivalents is deprecated.")
collist = sql_util.folded_equivalents(self)
collist = [self.left, self.right]