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TST: Add test for Arrow decimal groupby variance #62754

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TST: Add test for Arrow decimal groupby variance #62754

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8463664
Add test for Arrow decimal groupby variance
nour-taqatqa Oct 19, 2025
d2d716a
edited comment for test\
nour-taqatqa Oct 19, 2025
2781b3e
reverted groupby.py to upstream/main
nour-taqatqa Oct 21, 2025
b2baf44
Fix test for Arrow-backed variance and update expected dtype
nour-taqatqa Oct 21, 2025
2fce768
Delete old test from test_cython.py
nour-taqatqa Oct 21, 2025
537a152
Revert test_cython.py to upstream/main
nour-taqatqa Oct 21, 2025
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7 changes: 7 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 @@ -3700,3 +3700,10 @@ def test_pow_with_all_na_float():
result = s.pow(2)
expected = pd.Series([pd.NA, pd.NA], dtype="float64[pyarrow]")
tm.assert_series_equal(result, expected)

def test_groupby_var_arrow_decimal():
df = pd.DataFrame({"A": pd.Series([True, True], dtype="bool[pyarrow]"), "B": pd.Series([Decimal(123), Decimal(12)], dtype=pd.ArrowDtype(pa.decimal128(6,3)))})
result=df.groupby("A").var().dtypes
expected = pd.Series([pd.ArrowDtype(pa.float64())], index=result.index)

tm.assert_series_equal(result, expected)