public void close() {
        isRunning = false;
        handover.close();
    }
Process change messages from the {@link Handover} and collect the processed messages by
{@link Collector}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/org/apache/inlong/sort/cdc/postgres/debezium/internal/DebeziumChangeFetcher.java