code: def test_update_columnar_append(self):
      tbl = Table({"a": ["abc"], "b": [123]})
      tbl.update({"a": ["def"], "b": [456]})
      assert tbl.view().to_records() == [
          {"a": "abc", "b": 123},
          {"a": "def", "b": 456},
      ]
  
imports: import numpy
  import pyarrow
  import pandas
  from datetime import date, datetime
  from perspective.table import Table
  from pytest import mark
label_desc: Use image node_id 17 for calling the TestUpdate obj's underlying member method code with example usage: obj.test_update_columnar_append() without return types