def METHOD_NAME():
    ak_array_in = ak.Array(
        [
            [[1.1, 2.2, 3.3]],
            [[4.4, 5.5]],
            [[6.6], [7.7, 8.8, 9.9]],
        ]
    )
    data_frame = ak.to_rdataframe({"x": ak_array_in})
    # awkward::ListArray_ type
    # assert data_frame.GetColumnType("x") == "ROOT::VecOps::RVec<double>"
    ak_array_out = ak.from_rdataframe(
        data_frame,
        columns=("x",),
    )
    assert ak_array_in.to_list() == ak_array_out["x"].to_list()