code: public void addBroadcastSetForSumFunction(String name, DataSet<?> data) {
  		this.bcVarsSum.add(new Tuple2<>(name, data));
  	}
docs: Adds a data set as a broadcast set to the sum function.
  
  @param name The name under which the broadcast data is available in the sum function.
  @param data The data set to be broadcast.