itholic commented on a change in pull request #34113:
URL: https://github.com/apache/spark/pull/34113#discussion_r718164009
##########
File path: python/pyspark/pandas/indexes/multi.py
##########
@@ -1137,6 +1137,42 @@ def intersection(self, other: Union[DataFrame, Series,
Index, List]) -> "MultiIn
)
return cast(MultiIndex, DataFrame(internal).index)
+ def equal_levels(self, other: "MultiIndex") -> bool:
+ """
+ Return True if the levels of both MultiIndex objects are the same
+
+ Examples
+ --------
+ >>> 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
+
+ >>> psmidx2 = ps.MultiIndex.from_tuples([("a", "x"), ("b", "y"), ("c",
"j")])
+ >>> psmidx1.equal_levels(psmidx2)
+ False
+ """
+ nlevels = self.nlevels
+ if nlevels != other.nlevels:
+ return False
+
+ self_sdf = self._internal.spark_frame
+ other_sdf = other._internal.spark_frame
+ subtract_list = []
+ for nlevel in range(nlevels):
+ self_index_scol = self._internal.index_spark_columns[nlevel]
+ other_index_scol = other._internal.index_spark_columns[nlevel]
+ self_subtract_other = self_sdf.select(self_index_scol).subtract(
Review comment:
I think we don't need to preserve the same values.
It only compares unique value of each levels.
For example,
```python
>>> pmidx1 = pd.MultiIndex.from_tuples([("a", "x"), ("b", "y"), ("a", "y"),
("b", "x")])
>>> pmidx2 = pd.MultiIndex.from_tuples([("b", "x"), ("a", "y")])
>>> pmidx1.equal_levels(pmidx2)
True
```
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