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BUG: BooleanArray+pd.NA altering array inplace #45421

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Merged
merged 6 commits into from
Jan 19, 2022
Merged

BUG: BooleanArray+pd.NA altering array inplace #45421

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b97078f
BUG: BooleanArray+pd.NA alters in-place
jbrockmendel Jan 17, 2022
bc955a3
Whatsnew
jbrockmendel Jan 17, 2022
79518ec
GH ref
jbrockmendel Jan 17, 2022
b37514a
Merge branch 'main' into ref-nullable-ops
jbrockmendel Jan 18, 2022
756ed34
use shared masked test
jbrockmendel Jan 18, 2022
050643e
Merge branch 'main' into ref-nullable-ops
jbrockmendel Jan 19, 2022
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v1.5.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,7 @@ Timezones

Numeric
^^^^^^^
-
- Bug in operations with array-likes with ``dtype="boolean"`` and :attr:`NA` incorrectly altering the array in-place (:issue:`45421`)
-

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3 changes: 2 additions & 1 deletion pandas/core/arrays/boolean.py
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Expand Up @@ -494,7 +494,8 @@ def _arith_method(self, other, op):
if mask is None:
mask = self._mask
if other is libmissing.NA:
mask |= True
# GH#45421 don't alter inplace
mask = mask | True
else:
mask = self._mask | mask

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8 changes: 7 additions & 1 deletion pandas/tests/arrays/masked/test_arithmetic.py
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Expand Up @@ -47,16 +47,22 @@ def test_array_scalar_like_equivalence(data, all_arithmetic_operators):
tm.assert_extension_array_equal(result, expected)


def test_array_NA(data, all_arithmetic_operators, request):
def test_array_NA(data, all_arithmetic_operators):
data, _ = data
op = tm.get_op_from_name(all_arithmetic_operators)
check_skip(data, all_arithmetic_operators)

scalar = pd.NA
scalar_array = pd.array([pd.NA] * len(data), dtype=data.dtype)

mask = data._mask.copy()
result = op(data, scalar)
# GH#45421 check op doesn't alter data._mask inplace
tm.assert_numpy_array_equal(mask, data._mask)

expected = op(data, scalar_array)
tm.assert_numpy_array_equal(mask, data._mask)

tm.assert_extension_array_equal(result, expected)


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