code: def test_distinct(self):
      t = self.t_env.from_elements(
          [(1, "Hi", "Hello")], ["a", "b", "c"]
      )
      result = t.distinct()
  
      query_operation = result._j_table.getQueryOperation()
      self.assertEqual(
          "DistinctQueryOperation",
          query_operation.getClass().getSimpleName(),
      )
  
label_desc: Use image node_id 1 for calling the StreamTableDistinctTests obj's underlying member method code with example usage: obj.test_distinct() without return types