itholic commented on code in PR #38015:
URL: https://github.com/apache/spark/pull/38015#discussion_r980953075
##########
python/pyspark/pandas/indexes/base.py:
##########
@@ -1907,6 +1908,9 @@ def append(self, other: "Index") -> "Index":
)
index_fields = self._index_fields_for_union_like(other,
func_name="append")
+ # Since pandas 1.5.0, the order of category matters.
+ if isinstance(other, CategoricalIndex):
+ other = other.reorder_categories(self.categories.to_list())
Review Comment:
Oh, yeah we should separate the test. Let me address it
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