@SuppressWarnings("unchecked")
    @Override
    public TypeInformation<Row> getProducedType() {
        return (TypeInformation<Row>) TableFormatForRowUtils.getType(rowFormatInfo.getTypeInfo());
    }
The literal represented null values, default "".
inlong-sort/sort-formats/format-row/format-kv/src/main/java/org/apache/inlong/sort/formats/kv/KvDeserializationSchema.java