private RowDataToFieldConverter createTimeConverter() {
        return inputObj -> {
            int millisecond = (int) inputObj;
            LocalTime localTime = LocalTime.ofSecondOfDay(millisecond / 1000L);
            return SQL_TIME_FORMAT.format(localTime);
        };
    }
Creates a runtime converter which assuming input object is not null.
inlong-sort/sort-formats/format-rowdata/format-rowdata-json/src/main/java/org/apache/inlong/sort/formats/json/RowDataToFieldConverters.java