[GitHub] [spark] itholic commented on pull request #37739: [SPARK-40265][PS] Fix the inconsistent behavior for Index.intersection.

[GitBox <gi...@apache.org>]

itholic commented on PR #37739:
URL: https://github.com/apache/spark/pull/37739#issuecomment-1236571566

   > 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([], )
   > ```
   
   @zhengruifeng Seems like the `psidx` in your example is still using `Index` rather than `MultiIndex` ?
   
   Maybe do you mean:
   
   ```python
   >>> psmidx
   MultiIndex([(1, 2),
               (3, 4)],
              )
   >>> psmidx.intersection([(1, 2), (3, 4)]).sort_values()
   MultiIndex([(1, 2),
               (3, 4)],
              )
   ```
   
   ??
   
   In this case, it works same as pandas as below:
   
   ```python
   >>> psmidx.to_pandas().intersection([(1, 2), (3, 4)])
   MultiIndex([(1, 2),
               (3, 4)],
              )
   ```


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