private List<MySQLColumnInfo> buildAddColumns() {
        List<MySQLColumnInfo> list = Lists.newArrayList(
                new MySQLColumnInfo("add_column1", "int(12)", ""),
                new MySQLColumnInfo("add_column2", "varchar(22)", ""));
        return list;
    }
Build add MySQL column info.

@return {@link List}
inlong-manager/manager-service/src/test/java/org/apache/inlong/manager/service/sink/MySQLSinkServiceTest.java