code: @Override
  	void releaseAllResources() throws IOException {
  		if (!isReleased) {
  			isReleased = true;
  
  			ResultSubpartitionView view = subpartitionView;
  			if (view != null) {
  				view.releaseAllResources();
  				subpartitionView = null;
  			}
  		}
  	}
docs: Releases the partition reader.