itholic commented on a change in pull request #33634:
URL: https://github.com/apache/spark/pull/33634#discussion_r683955183
##########
File path: python/pyspark/pandas/indexes/base.py
##########
@@ -2292,9 +2292,7 @@ def union(
sdf_self =
self._internal.spark_frame.select(self._internal.index_spark_columns)
sdf_other =
other_idx._internal.spark_frame.select(other_idx._internal.index_spark_columns)
- sdf = sdf_self.union(sdf_other.subtract(sdf_self))
- if isinstance(self, MultiIndex):
- sdf = sdf.drop_duplicates()
+ sdf =
sdf_self.unionAll(sdf_other).exceptAll(sdf_self.intersectAll(sdf_other))
if sort:
Review comment:
Thanks, @HyukjinKwon !
Seems like they said "dropping duplicate Index values" was a bug, and fixed
in this release.
Related discussion was made at
https://github.com/pandas-dev/pandas/issues/36289 and
https://github.com/pandas-dev/pandas/issues/31326.
Also checked the `sort` and drop duplicates, works the same as pandas.
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