code: def test_update_implicit_index(self):
      data = [{"a": 1, "b": 2}, {"a": 2, "b": 3}]
      tbl = Table(data)
      view = tbl.view()
      tbl.update([{"__INDEX__": [0], "a": 3, "b": 15}])
      assert view.to_records() == [{"a": 3, "b": 15}, {"a": 2, "b": 3}]
  
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 49 for calling the TestUpdate obj's underlying member method code with example usage: obj.test_update_implicit_index() without return types