@Override
    public Map<String, DataType> listWritableMetadata() {
        final Map<String, DataType> metadataMap = new LinkedHashMap<>();
        Stream.of(WritableMetadata.values()).forEachOrdered(m -> metadataMap.put(m.key, m.dataType));
        return metadataMap;
    }
Metadata that is appended at the end of a physical sink row.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/pulsar/src/main/java/org/apache/inlong/sort/pulsar/table/PulsarDynamicTableSink.java