@Override
                    public Object read(Message msg) {
                        return StringData.fromString(msg.getTopic());
                    }
Watermark strategy that is used to generate per-partition watermark.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/tubemq/src/main/java/org/apache/inlong/sort/tubemq/table/TubeMQTableSource.java