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TST: Add regression test for DataFrame.where with nullable dtype (#49052) #63222

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Merged
merged 4 commits into from
Dec 2, 2025
Merged

TST: Add regression test for DataFrame.where with nullable dtype (#49052) #63222

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TST: Add regression test for DataFrame.where with nullable dtype (#49…
zhan7236 Nov 28, 2025
e19e415
Address review: use DataFrame constructor directly
zhan7236 Dec 2, 2025
1dd30ee
Merge branch 'main' into test-gh49052-where-nullable-dtype
zhan7236 Dec 2, 2025
e65d633
ci: retrigger CI
zhan7236 Dec 2, 2025
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10 changes: 10 additions & 0 deletions pandas/tests/frame/indexing/test_where.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1063,3 +1063,13 @@ def test_where_inplace_no_other():
assert result is df
expected = DataFrame({"a": [1, np.nan], "b": [np.nan, "y"]})
tm.assert_frame_equal(df, expected)


def test_where_other_nullable_dtype():
# GH#49052 DataFrame.where should return nullable dtype when
# other is a Series with nullable dtype, matching Series.where behavior
df = DataFrame([1, 2, 3], dtype="int64")
other = Series([pd.NA, pd.NA, pd.NA], dtype="Int64")
result = df.where(df > 1, other, axis=0)
expected = DataFrame({0: Series([pd.NA, 2, 3], dtype="Int64")})
tm.assert_frame_equal(result, expected)
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