@Override
    public boolean isCurUnSeqOverlappedWith(long time) {
      return time >= dataSource.getCurrentUnSeqOrderTime(curUnseqFileIndex);
    }
Return true if taking first page reader from seq readers
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/SeriesScanUtil.java