使用工具sql都能正常执行

Sql db2Sql=Sqls.create("SELECT concat(rtrim(char(year(current date))),"
    				+ "concat(substr( digits(month(current date)),9),substr(digits(day(current date)),9))) AS date,"
    				+ "NEXTVAL FOR RECORDNOSEQ  AS num FROM sysibm.sysdummy1");
    		db2Sql.setCallback(Sqls.callback.record());
        	dao().execute(db2Sql);

com.alibaba.druid.sql.parser.ParserException: ERROR. token : CONCAT, pos : 13