code: def test_integration_subselect_no_alias(self, mock_handler):
      self.set_handler(
          mock_handler, name="pg", tables={"tasks": self.task_table}
      )
  
      ret = self.execute(
          """
             SELECT max(y2) FROM (
                select a as y2 from pg.tasks
             )
          """
      )
  
      # second column is having last value of 'b'
      # 3: count rows, 4: sum of 'a', 5 max of prediction
      assert ret.data[0] == [2]
  
imports: from unittest.mock import patch
  import datetime
  import tempfile
  import pytest
  import pandas
  import numpy
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb.api.executor.utilities.sql import query_df
  from mindsdb.api.mysql.mysql_proxy.utilities.lightwood_dtype import dtype
  from .executor_test_base import BaseExecutorMockPredictor
label_desc: Use image node_id 4 for calling the TestTableau obj's underlying member method code with example usage: obj.test_integration_subselect_no_alias(mock_handler) without return types