code: public ArrayOfDoublesUpdatableSketch build(final WritableMemory dstMem) {
      return new DirectArrayOfDoublesQuickSelectSketch(nomEntries_, resizeFactor_.lg(), 
          samplingProbability_, numValues_, seed_, dstMem);
    }
docs: Returns an ArrayOfDoublesUpdatableSketch with the current configuration of this Builder.
  @param dstMem instance of Memory to be used by the sketch
  @return an ArrayOfDoublesUpdatableSketch