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TST: Add test for groupby.var() pyarrow dtype retention #63704

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Merged
jbrockmendel merged 2 commits into from
Mar 6, 2026
+22 −0
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TST: Add test for groupby.var() pyarrow dtype retention #63704

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04e8db3
TST: Add test for groupby.var() arrow dtype retention
VedantMadane Feb 10, 2026
d4fe630
TST: Move pyarrow groupby agg test to tests/extension/test_arrow.py
VedantMadane Mar 6, 2026
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22 changes: 22 additions & 0 deletions pandas/tests/extension/test_arrow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3363,6 +3363,28 @@ def test_groupby_count_return_arrow_dtype(data_missing):
tm.assert_frame_equal(result, expected)


@pytest.mark.parametrize("op_name", ["var", "std", "sem", "mean"])
@pytest.mark.parametrize("dtype", ["int64[pyarrow]", "float64[pyarrow]"])
def test_groupby_cython_agg_pyarrow_dtype_retention(op_name, dtype):
# GH#54627
arr = pd.array([1, 2, 3, 4], dtype=dtype)
df = pd.DataFrame({"key": ["a", "a", "b", "b"], "col": arr})
grouped = df.groupby("key")
expected_dtype = ArrowDtype(pa.float64())

result = getattr(grouped, op_name)()
assert result["col"].dtype == expected_dtype

result = grouped.aggregate(op_name)
assert result["col"].dtype == expected_dtype

result = getattr(grouped["col"], op_name)()
assert result.dtype == expected_dtype

result = grouped["col"].aggregate(op_name)
assert result.dtype == expected_dtype


def test_fixed_size_list():
# GH#55000
ser = pd.Series(
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