public synchronized void clear() {
    if (unfinishedCount == 0) {
      this.splits = null;
    }
  }
Remove finished splits.

@return True if all splits are finished, otherwise false.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/split/TemporalJoinSplits.java