_maybe_restore_index_levels(self, result: 'DataFrame') -> 'None'
Here we check for cases where :None:None:`self.left_on` and :None:None:`self.right_on` pairs each reference an index level in their respective DataFrames. The joined columns corresponding to these pairs are then restored to the index of :None:None:`result`.
Note: This method has side effects. It modifies :None:None:`result` in-place
merge result
Restore index levels specified as :None:None:`on` parameters
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