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[SPARK-40577][PS] Fix CategoricalIndex.append to match pandas 1.5.0 #38015

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itholic wants to merge 2 commits into from
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[SPARK-40577][PS] Fix CategoricalIndex.append to match pandas 1.5.0 #38015

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[SPARK-40577][PS] Fix CategoricalIndex.append to match pandas 1.5.0
itholic Sep 27, 2022
997af7d
make the test pass in pandas < 1.5.0
itholic Sep 27, 2022
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4 changes: 4 additions & 0 deletions python/pyspark/pandas/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1896,6 +1896,7 @@ def append(self, other: "Index") -> "Index":
)
"""
from pyspark.pandas.indexes.multi import MultiIndex
from pyspark.pandas.indexes.category import CategoricalIndex

if isinstance(self, MultiIndex) != isinstance(other, MultiIndex):
raise NotImplementedError(
Expand All @@ -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())
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sdf_self = self._internal.spark_frame.select(self._internal.index_spark_columns)
sdf_other = other._internal.spark_frame.select(other._internal.index_spark_columns)
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