@Override
    public Map<String, DataType> listReadableMetadata() {
        return Stream.of(MongoDBReadableMetadata.values())
                .collect(
                        Collectors.toMap(
                                MongoDBReadableMetadata::getKey,
                                MongoDBReadableMetadata::getDataType));
    }
Metadata that is appended at the end of a physical source row.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/cdc/mongodb/table/MongoDBTableSource.java