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ARROW-3652: [Python][Parquet] Add unit test exhibiting that pandas.CategoricalIndex survives roundtrip to Parquet format #5117

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ARROW-3652: [Python][Parquet] Add unit test exhibiting that pandas.CategoricalIndex survives roundtrip to Parquet format #5117

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15 changes: 15 additions & 0 deletions python/pyarrow/tests/test_parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2985,6 +2985,21 @@ def test_parquet_file_too_small(tempdir):
pq.read_table(path)


@pytest.mark.pandas
def test_categorical_index_survives_roundtrip():
# ARROW-3652, addressed by ARROW-3246
df = pd.DataFrame([['a', 'b'], ['c', 'd']], columns=['c1', 'c2'])
df['c1'] = df['c1'].astype('category')
df = df.set_index(['c1'])

table = pa.Table.from_pandas(df)
bos = pa.BufferOutputStream()
pq.write_table(table, bos)
ref_df = pq.read_pandas(bos.getvalue()).to_pandas()
assert isinstance(ref_df.index, pd.CategoricalIndex)
assert ref_df.index.equals(df.index)


def test_dictionary_array_automatically_read():
# ARROW-3246

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