@Override
  public String toString() {
    String startTimeInStr = new SimpleDateFormat().format(new Date(startTime));
    return String.format(
        "Task start time: %s, total process chunk num: %d, "
            + "directly flush chunk num: %d, merge chunk num: %d, deserialize chunk num: %d,"
            + " directly flush page num: %d, total process point num: %d, rewrite point num: %d",
        startTimeInStr,
        processChunkNum,
        directlyFlushChunkNum,
        mergedChunkNum,
        deserializeChunkCount,
        directlyFlushPageCount,
        processPointNum,
        rewritePointNum);
  }
The summary of one {@link AbstractCompactionTask} execution.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/compaction/execute/task/CompactionTaskSummary.java