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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