private void logFlushQueryReadUnlocked() {
    if (logger.isDebugEnabled()) {
      logger.debug(
          "{}: {} release flushQueryLock", dataRegionName, tsFileResource.getTsFile().getName());
    }
  }
Return Long.MAX_VALUE if workMemTable is null
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/TsFileProcessor.java