Derby支持fetch子句，不支持limit子句，SQLUtils.toSQLString会将fetch输出为limit
Druid版本： 1.1.21
测试用例：

String dbType = JdbcConstants.DERBY;
        String sql = "select * from mytest FETCH FIRST 200 ROWS ONLY";
        List<SQLStatement> statements = SQLUtils.parseStatements(sql, dbType);
        FormatOption DEFAULT_FORMAT_OPTION = new FormatOption(false, false, false);

        for(SQLStatement statement : statements) {
            String result = SQLUtils.toSQLString(statement, dbType, DEFAULT_FORMAT_OPTION);
            // 输出结果为: sql: select * from mytest limit 200
            System.out.println("sql: " + result);
        }