restore_dropped_levels_multijoin(left: 'MultiIndex', right: 'MultiIndex', dropped_level_names, join_index: 'Index', lindexer: 'npt.NDArray[np.intp]', rindexer: 'npt.NDArray[np.intp]') -> 'tuple[list[Index], npt.NDArray[np.intp], list[Hashable]]'
Returns the levels, labels and names of a multi-index to multi-index join. Depending on the type of join, this method restores the appropriate dropped levels of the joined multi-index. The method relies on lidx, rindexer which hold the index positions of left and right, where a join was feasible
left index
right index
list of non-common level names
the index of the join between the common levels of left and right
left indexer
right indexer
levels of combined multiindexes
labels of combined multiindexes
names of combined multiindex levels
this is an internal non-public method
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