@Override
    public Set<String> finishedSplits() {
        return finishedSnapshotSplits;
    }
An implementation of {@link RecordsWithSplitIds} which contains the records of one table split.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/meta/split/ChangeEventRecords.java