How to use the pymapd._pandas_loaders.build_input_columnar function in pymapd

def test_build_table_columnar(self):

        from pymapd._pandas_loaders import build_input_columnar

        data = pd.DataFrame({"a": [1, 2, 3], "b": [1.1, 2.2, 3.3]})
        nulls = [False] * 3
        result = build_input_columnar(data, preserve_index=False)
        expected = [
            TColumn(TColumnData(int_col=[1, 2, 3]), nulls=nulls),
            TColumn(TColumnData(real_col=[1.1, 2.2, 3.3]), nulls=nulls)
        ]
        assert_columnar_equal(result[0], expected)