@Override
  public CompactionTaskType getCompactionTaskType() {
    if (filesView.sequence) {
      return CompactionTaskType.INNER_SEQ;
    } else {
      return CompactionTaskType.INNER_UNSEQ;
    }
  }
release the read lock and write lock of files if it is held, and set the merging status of
selected files to false.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/compaction/execute/task/InnerSpaceCompactionTask.java