@Test
  public void testParseValuesInUnion() throws Exception {
    parseDriver.parse("values(1,2,3),(4,5,6)\n" +
            "union all\n" +
            "values(1,2,3),(4,5,6)", null);
  }
Test cases for parse WITHIN GROUP clause syntax.
function(expression) WITHIN GROUP (ORDER BY sort_expression)
parser/src/test/org/apache/hadoop/hive/ql/parse/TestValuesClause.java