WITH RECURSIVE query when cloned using SqlShuttle loses RECURSIVE property

 @Test void testRecursiveQueryCloned() throws Exception {
    SqlNode sqlNode = sql("with RECURSIVE emp2 as "
        + "(select * from emp union select * from emp2) select * from emp2").parser().parseStmt();
    SqlNode sqlNode1 = sqlNode.accept(new SqlShuttle() {
   @Override public SqlNode visit(SqlIdentifier identifier) {
             return new SqlIdentifier(identifier.names, identifier.getParserPosition());
           }
  });
      System.out.println(sqlNode1.toSqlString(c -> c.withAlwaysUseParentheses(false)).getSql());
  }

WITH "EMP2" AS (SELECT *
            FROM "EMP"
            UNION
            SELECT *
            FROM "EMP2") SELECT *
        FROM "EMP2"