code: public List<T> collect() throws Exception {
  		final String id = new AbstractID().toString();
  		final TypeSerializer<T> serializer = getType().createSerializer(getExecutionEnvironment().getConfig());
  
  		this.output(new Utils.CollectHelper<>(id, serializer)).name("collect()");
  		JobExecutionResult res = getExecutionEnvironment().execute();
  
  		ArrayList<byte[]> accResult = res.getAccumulatorResult(id);
  		if (accResult != null) {
  			try {
  				return SerializedListAccumulator.deserializeList(accResult, serializer);
  			} catch (ClassNotFoundException e) {
  				throw new RuntimeException("Cannot find type class of collected data type.", e);
  			} catch (IOException e) {
  				throw new RuntimeException("Serialization error while deserializing collected data", e);
  			}
  		} else {
  			throw new RuntimeException("The call to collect() could not retrieve the DataSet.");
  		}
  	}
docs: Convenience method to get the elements of a DataSet as a List.
  As DataSet can contain a lot of data, this method should be used with caution.
  
  @return A List containing the elements of the DataSet