code: public static EWAHCompressedBitmap or(final Iterator<EWAHCompressedBitmap> bitmaps) {
          PriorityQueue<EWAHCompressedBitmap> pq = new PriorityQueue<EWAHCompressedBitmap>(32,
                  new Comparator<EWAHCompressedBitmap>() {
                      @Override
                      public int compare(EWAHCompressedBitmap a, EWAHCompressedBitmap b) {
                          return a.sizeInBytes()
                                  - b.sizeInBytes();
                      }
                  }
          );
          while(bitmaps.hasNext())
              pq.add(bitmaps.next());
          if(pq.isEmpty()) return new EWAHCompressedBitmap();
          while (pq.size() > 1) {
              EWAHCompressedBitmap x1 = pq.poll();
              EWAHCompressedBitmap x2 = pq.poll();
              pq.add(x1.or(x2));
          }
          return pq.poll();
      }
docs: Simple algorithm that computes the OR aggregate.
  
  @param bitmaps input bitmaps
  @return new bitmap containing the aggregate