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Concatenating rows with Int64 datatype coerces to object #36278

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Merged
merged 1 commit into from
Sep 13, 2020
Merged

Concatenating rows with Int64 datatype coerces to object #36278

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9 changes: 9 additions & 0 deletions pandas/tests/reshape/test_concat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2918,3 +2918,12 @@ def test_concat_frame_axis0_extension_dtypes():
result = pd.concat([df2, df1], ignore_index=True)
expected = pd.DataFrame({"a": [4, 5, 6, 1, 2, 3]}, dtype="Int64")
tm.assert_frame_equal(result, expected)


def test_concat_preserves_extension_int64_dtype():
# GH 24768
df_a = pd.DataFrame({"a": [-1]}, dtype="Int64")
df_b = pd.DataFrame({"b": [1]}, dtype="Int64")
result = pd.concat([df_a, df_b], ignore_index=True)
expected = pd.DataFrame({"a": [-1, None], "b": [None, 1]}, dtype="Int64")
tm.assert_frame_equal(result, expected)