@Override
  public boolean isDone(long timestamp) {
    // We can not skip Cells with small ts.
    return false;
  }
This method is not idempotent, we will save some info to judge VERSION_MASKED.
@param cell - current cell to check if deleted by a previously seen delete
@return We don't distinguish DeleteColumn and DeleteFamily. We only return code for column.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/NewVersionBehaviorTracker.java