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