@Override
    public <T> Comparator<T> comparingLong(ToLongFunction<? super T> keyExtractor) {
      Objects.requireNonNull(keyExtractor);
      return (Comparator<T> & Serializable)
          (c1, c2) -> Long.compare(keyExtractor.applyAsLong(c2), keyExtractor.applyAsLong(c1));
    }
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