def METHOD_NAME(self):
    """Check defining of order clause with single expr ASC.
    """
    expected = convert_output("""
     x  | s | sum
    ----+---+-----
      1 | a | 2
      1 | b | 2
      2 | b | 4
    """)
    execute_query(
        "SELECT x,s, sum(x) OVER (ORDER BY x ASC) AS sum FROM values('x Int8, s String', (1,'a'),(1,'b'),(2,'b'))",
        expected=expected
    )