code: public long getScannedPages() {
      int vacapacity = pageSize / VectorApproximation.byteOnDisk(splitPositions.length, partitions);
      long vasize = (long) Math.ceil((vectorApprox.size()) / (1.0 * vacapacity));
      return vasize * scans;
    }
docs: Get the number of scanned bytes.
  
  @return Number of scanned bytes.