zhengruifeng commented on PR #37739:
URL: https://github.com/apache/spark/pull/37739#issuecomment-1234230281

   what if the `psidx` itself is a `MultiIndex`?
   
   ```
   >>> psidx
   Int64Index([1, 2, 3, 4], dtype='int64', name='Koalas')
   >>> psidx.intersection([(1, 2), (3, 4)]).sort_values()
   MultiIndex([], )
   ```


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