Function test_asof_join

python/pyarrow/tests/test_acero.py:429–460

()

def test_asof_join():
    left = pa.table({'key': [1, 2, 3], 'ts': [1, 1, 1], 'a': [4, 5, 6]})
    left_source = Declaration("table_source", options=TableSourceNodeOptions(left))
    right = pa.table({'key': [2, 3, 4], 'ts': [2, 5, 2], 'b': [4, 5, 6]})
    right_source = Declaration("table_source", options=TableSourceNodeOptions(right))

    # asof join
    join_opts = AsofJoinNodeOptions(
        left_on="ts", left_by=["key"],
        right_on="ts", right_by=["key"],
        tolerance=1,
    )
    joined = Declaration(
        "asofjoin", options=join_opts, inputs=[left_source, right_source]
    )
    result = joined.to_table()
    expected = pa.table(
        [[1, 2, 3], [1, 1, 1], [4, 5, 6], [None, 4, None]],
        names=["key", "ts", "a", "b"])
    assert result == expected

    for by in [field("key"), ["key"], [field("key")]]:
        for on in [field("ts"), "ts"]:
            join_opts = AsofJoinNodeOptions(
                left_on=on, left_by=by,
                right_on=on, right_by=by,
                tolerance=1,
            )
            joined = Declaration(
                "asofjoin", options=join_opts, inputs=[left_source, right_source])
            result = joined.to_table()
            assert result == expected


@pytest.mark.dataset