code: def get_sql_task_cost(self):
          
          resp = self.get_task_result(self.get_task_names()[0])
          cost = json.loads(resp)
          sql_cost = cost['Cost']['SQL']
  
          udf_num = sql_cost.get('UDF')
          complexity = sql_cost.get('Complexity')
          input_size = sql_cost.get('Input')
          return Instance.SQLCost(udf_num, complexity, input_size)
docs: Get cost information of the sql task.
          Including input data size, number of UDF, Complexity of the sql task
  
          :return: cost info in dict format