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TEST: join df with categorical multiIndex #51088

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Merged
merged 4 commits into from
Feb 6, 2023
Merged

TEST: join df with categorical multiIndex #51088

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40bd638
TEST: join df with categorical multiIndex
natmokval Jan 31, 2023
ea7fe92
compare result and expected DataFrame
natmokval Feb 1, 2023
a2988bc
add pytest.mark.parameterize to the test
natmokval Feb 1, 2023
e0b78d8
use dataframes from the original example
natmokval Feb 2, 2023
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40 changes: 40 additions & 0 deletions pandas/tests/reshape/merge/test_join.py
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Original file line number Diff line number Diff line change
Expand Up @@ -956,3 +956,43 @@ def test_join_empty(left_empty, how, exp):
expected = expected.rename_axis("A")

tm.assert_frame_equal(result, expected)


@pytest.mark.parametrize(
"how, values",
[
("inner", [0, 1, 2]),
("outer", [0, 1, 2]),
("left", [0, 1, 2]),
("right", [0, 2, 1]),
],
)
def test_join_multiindex_categorical_output_index_dtype(how, values):
# GH#50906
df1 = DataFrame(
{
"a": Categorical([0, 1, 2]),
"b": Categorical([0, 1, 2]),
"c": [0, 1, 2],
}
).set_index(["a", "b"])

df2 = DataFrame(
{
"a": Categorical([0, 2, 1]),
"b": Categorical([0, 2, 1]),
"d": [0, 2, 1],
}
).set_index(["a", "b"])

expected = DataFrame(
{
"a": Categorical(values),
"b": Categorical(values),
"c": values,
"d": values,
}
).set_index(["a", "b"])

result = df1.join(df2, how=how)
tm.assert_frame_equal(result, expected)