code: public <T> void setBroadcastVariables(Map<String, Operator<T>> inputs) {
  		this.broadcastInputs.clear();
  		this.broadcastInputs.putAll(inputs);
  	}
docs: Clears all previous broadcast inputs and binds the given inputs as
  broadcast variables of this operator.
  
  @param inputs The {@code<name, root>} pairs to be set as broadcast inputs.