def group(self, other):
        e = self._graph.add_edge(self, other)
        e._group = True
        return other
Add a left outer join to the statement that's being constructed.
dataset/ETHPy150Open thasso/pyjip/jip/pipelines.py/Node.group--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/orm/strategies.py/JoinedLoader.setup_query