code: @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          if (this.isDrpc) {
              declarer.declare(new Fields("id", this.emitFieldForRowKey, this.emitFieldForColumnName));
          } else {
              declarer.declare(new Fields(this.emitFieldForRowKey, this.emitFieldForColumnName));
          }
      }
docs: Declares the fields produced by this bolt.
  
  
  @param declarer