@Override
    public String toString() {
        return "FinishedSnapshotSplitsAckEvent{" + "finishedSplits=" + finishedSplits + '}';
    }
The {@link SourceEvent} that {@link MySqlSourceEnumerator} sends to {@link MySqlSourceReader} to
notify the finished snapshot splits has been received, i.e. acknowledge for {@link
FinishedSnapshotSplitsReportEvent}.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/org/apache/inlong/sort/cdc/mysql/source/events/FinishedSnapshotSplitsAckEvent.java