@Override
    public Map<String, DataType> listReadableMetadata() {
        return Stream.of(PostgreSQLReadableMetadata.values())
                .collect(
                        Collectors.toMap(
                                PostgreSQLReadableMetadata::getKey,
                                PostgreSQLReadableMetadata::getDataType));
    }
Metadata that is appended at the end of a physical source row.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/postgre/PostgreSQLTableSource.java