itholic opened a new pull request #34113:
URL: https://github.com/apache/spark/pull/34113
### What changes were proposed in this pull request?
This PR proposes implementing `MultiIndex.equal_levels`.
```python
>>> psmidx1 = ps.MultiIndex.from_tuples([("a", "x"), ("b", "y"), ("c", "z")])
>>> psmidx2 = ps.MultiIndex.from_tuples([("b", "y"), ("a", "x"), ("c", "z")])
>>> psmidx1.equal_levels(psmidx2)
True
>>> psmidx1 = ps.MultiIndex.from_tuples([("a", "x"), ("b", "y"), ("c", "z"),
("a", "y")])
>>> psmidx2 = ps.MultiIndex.from_tuples([("a", "y"), ("b", "x"), ("c", "z"),
("c", "x")])
>>> psmidx1.equal_levels(psmidx2)
True
```
This was originally proposed in
https://github.com/databricks/koalas/pull/1789, and all reviews in origin PR
has been resolved.
### Why are the changes needed?
We should support the pandas API as much as possible for pandas-on-Spark
module.
### Does this PR introduce _any_ user-facing change?
Yes, the `MultiIndex.equal_levels` API is available.
### How was this patch tested?
Unittests
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