@_generative()
def add_entity(self, entity, alias=None):
    'add a mapped entity to the list of result columns\n        to be returned.'
    if (alias is not None):
        entity = aliased(entity, alias)
    self._entities = list(self._entities)
    m = _MapperEntity(self, entity)
    self._set_entity_selectables([m])
add a mapped entity to the list of result columns
to be returned.
@_generative()
def add_entity(self, entity, alias=None):
    'add a mapped entity to the list of result columns\n        to be returned.'
    if (alias is not None):
        entity = aliased(entity, alias)
    self._entities = list(self._entities)
    m = _MapperEntity(self, entity)
    self._set_entity_selectables([m])