Closed
Description
-
I have checked that this issue has not already been reported.
-
I have confirmed this bug exists on the latest version of pandas.
-
(optional) I have confirmed this bug exists on the master branch of pandas.
Code Sample
>>>frame = pd.DataFrame([(1,2,3,4),(4,5,6,7)],columns=["i1", "i2", "i3","val"]).set_index(["i1","i2","i3"])
>>>frame2 = pd.DataFrame([(1,2,3),(4,5,6)],columns=["i1", "i2", "val"]).set_index(["i1","i2"])
>>>frame.index.join(frame2.index,return_indexers=False)
(MultiIndex([(1, 2, 3),
(4, 5, 6)],
names=['i1', 'i2', 'i3']), None, None)
Problem description
Parameter return_indexers is ignored in some cases of __join_multi
Expected Output
>>>frame.index.join(frame2.index,return_indexers=False)
MultiIndex([(1, 2, 3),
(4, 5, 6)],
names=['i1', 'i2', 'i3'])