code: public static SparseBitmap materialize(SkippableIterator i) {
  		SparseBitmap answer = new SparseBitmap();
  		while (i.hasValue()) {
  			answer.add(i.getCurrentWord(), i.getCurrentWordOffset());
  			i.advance();
  		}
  		return answer;
  	}
docs: Materialize.
  
  @param i
  the i
  @return the sparse bitmap