code: def test_update_columnar_from_schema_notify(self):
      tbl = Table({"a": str, "b": int})
      view = tbl.view()
      assert view.num_rows() == 0
      tbl.update({"a": ["abc"], "b": [123]})
      assert view.to_records() == [{"a": "abc", "b": 123}]
  
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 20 for calling the TestUpdate obj's underlying member method code with example usage: obj.test_update_columnar_from_schema_notify() without return types