@Test
public void functionTest1() {

  String ruleCode = "set col: speed value: timestamp('2011-01-01','yyyy-MM-dd')";
  RuleVisitorParser parser = new RuleVisitorParser();
  Set setRule = (Set) parser.parse(ruleCode);
  ExprEval exprEval = ((Expr)setRule.getValue()).eval(null);
  System.out.println(exprEval.toString());
  assertEquals("2011-01-01T00:00:00.000+09:00", exprEval.asString());
}