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GH-44188: [Python] Fix pandas roundtrip with bytes column names #44171

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Merged
pitrou merged 2 commits into from
Feb 27, 2025
Merged

GH-44188: [Python] Fix pandas roundtrip with bytes column names #44171

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772427d
Fix pandas roundtrip with bytes column names
Piong1997 Sep 19, 2024
e619630
Improve test a bit
pitrou Feb 27, 2025
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2 changes: 1 addition & 1 deletion python/pyarrow/pandas_compat.py
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Expand Up @@ -1163,7 +1163,7 @@ def _reconstruct_columns_from_metadata(columns, column_indexes):
if dtype == np.bytes_:
level = level.map(encoder)
# ARROW-13756: if index is timezone aware DataTimeIndex
if pandas_dtype == "datetimetz":
elif pandas_dtype == "datetimetz":
tz = pa.lib.string_to_tzinfo(
column_indexes[0]['metadata']['timezone'])
level = pd.to_datetime(level, utc=True).tz_convert(tz)
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7 changes: 7 additions & 0 deletions python/pyarrow/tests/test_pandas.py
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Expand Up @@ -5241,6 +5241,13 @@ def roundtrip(df, schema=None):
schema=schema)


def test_bytes_column_name_to_pandas():
df = pd.DataFrame([[0.1, 0.2], [0.3, 0.4]], columns=[b'col1', b'col2'])
table = pa.Table.from_pandas(df)
assert table.column_names == ['col1', 'col2']
assert table.to_pandas().equals(df)


@pytest.mark.processes
def test_is_data_frame_race_condition():
# See https://github.com/apache/arrow/issues/39313
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