code: def test_last(self, data_handler):
      df = pd.DataFrame(
          [
              {"a": 1, "b": "a"},
              {"a": 2, "b": "b"},
              {"a": 3, "b": "c"},
          ]
      )
      self.set_handler(data_handler, name="pg", tables={"tasks": df})
  
      # -- create model --
      self.run_sql(
          """
                  CREATE model task_model
                  from pg (select * from tasks)
                  PREDICT a
                  using engine='dummy_ml'
              """
      )
  
      # --- check web editor  ---
      ret = self.run_sql(
          """
              select * from pg.tasks where a>last
           """
      )
      # first call is empty
      assert len(ret) == 0
  
      # add rows to dataframe
      df.loc[len(df.index)] = [4, "d"]  # should be tracked
      df.loc[len(df.index)] = [0, "z"]  # not tracked
  
      ret = self.run_sql(
          """
              select * from pg.tasks where a>last
          """
      )
  
      # second call content one new line
      assert len(ret) == 1
      assert ret.a[0] == 4
  
      # --- TEST view ---
  
      # view without target
      with pytest.raises(Exception) as exc_info:
          self.run_sql(
              """
                  create view v1 (
                      select b from pg.tasks where a>last
                  )
              """
          )
      assert "should be in query target" in str(exc_info.value)
  
      # view with target
      self.run_sql(
          """
              create view v1 (
                  select * from pg.tasks where a>last
              )
          """
      )
  
      ret = self.run_sql(
          """
            select * from v1
          """
      )
      # first call is empty
      assert len(ret) == 0
  
      # add row to dataframe
      df.loc[len(df.index)] = [5, "a"]
  
      ret = self.run_sql(
          """
              select * from v1
          """
      )
  
      # second call content one new line
      assert len(ret) == 1
      assert ret.a[0] == 5
  
      # add row to dataframe
      df.loc[len(df.index)] = [6, "a"]
  
      # use model
      ret = self.run_sql(
          """
               SELECT m.*
                 FROM v1 as t
                 JOIN task_model as m
          """
      )
  
      # second call content one new line
      assert len(ret) == 1
  
imports: from unittest.mock import patch
  import datetime
  import time
  import pytest
  import pandas
  from mindsdb_sql import parse_sql
  from .executor_test_base import BaseExecutorDummyML
label_desc: Use image node_id 10 for calling the TestProjectStructure obj's underlying member method code with example usage: obj.test_last(data_handler) without return types