protected void updateCurrentReadStopTime(long endTime) {
    currentReadStopTime = Math.max(currentReadStopTime, endTime);
  }
This class implements {@link IPointReader} for data sources with different priorities.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/PriorityMergeReader.java