public void setHighWatermark(BinlogOffset highWatermark) {
            this.highWatermark = highWatermark;
        }
{@link ChangeEventSource.ChangeEventSourceContext} implementation that keeps low/high
watermark for each {@link MySqlSnapshotSplit}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/debezium/reader/SnapshotSplitReader.java