public Collection<String> finishedSplitIds() {
    return finishedSplitIds;
  }
We can remove this class once FLINK-21364 is resolved.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/split/SplitRequestEvent.java