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REGR: Fix IntervalArray.nunique with infinity #63267

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REGR: Fix IntervalArray.nunique with infinity #63267

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REGR: Fix IntervalArray.nunique with infinity
rhshadrach Dec 4, 2025
d54d982
np.asarray
rhshadrach Dec 5, 2025
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5 changes: 2 additions & 3 deletions pandas/core/arrays/interval.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2128,9 +2128,8 @@ def _combined(self) -> IntervalSide:
)
comb = comb.view("complex128")[:, 0]
else:
comb = (np.array(left.ravel(), dtype="complex128")) + (
1j * np.array(right.ravel(), dtype="complex128")
)
comb = np.asarray(left.ravel(), dtype="complex128")
comb.imag = right.ravel()
return comb

def _from_combined(self, combined: np.ndarray) -> IntervalArray:
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14 changes: 14 additions & 0 deletions pandas/tests/arrays/interval/test_interval.py
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Expand Up @@ -136,6 +136,20 @@ def test_unique_with_negatives(self):
)
tm.assert_index_equal(result, expected)

@pytest.mark.parametrize(
"data",
[
[Interval(-np.inf, 0), Interval(-np.inf, 1)],
[Interval(0, np.inf), Interval(1, np.inf)],
],
)
def test_unique_with_infinty(self, data):
# https://github.com/pandas-dev/pandas/issues/63218
s = pd.Series(data)
tm.assert_interval_array_equal(s.unique(), s.array)
assert s.nunique() == 2
tm.assert_series_equal(s.drop_duplicates(), s)


class TestSetitem:
def test_set_na(self, left_right_dtypes):
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