@Override
    public TypeInformation<Row> getProducedType() {
        return InLongMsgUtils.decorateRowTypeWithNeededHeadFields(timeFieldName, attributesFieldName, rowFormatInfo);
    }
The literal represented null values, default "".
inlong-sort/sort-formats/format-row/format-inlongmsg-tlogcsv/src/main/java/org/apache/inlong/sort/formats/inlongmsgtlogcsv/InLongMsgTlogCsvFormatDeserializer.java