@Override
    public boolean hasNextUnseqResource() {
      while (dataSource.hasNextUnseqResource(curUnseqFileIndex, true, deviceID)) {
        if (dataSource.isUnSeqSatisfied(
            deviceID, curUnseqFileIndex, scanOptions.getGlobalTimeFilter(), false)) {
          break;
        }
        curUnseqFileIndex++;
      }
      return dataSource.hasNextUnseqResource(curUnseqFileIndex, true, deviceID);
    }
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