docs: public <R> SingleOutputStreamOperator<R> select(
  			final PatternSelectFunction<T, R> patternSelectFunction,
  			final TypeInformation<R> outTypeInfo) {
  
  		final PatternProcessFunction<T, R> processFunction =
  			fromSelect(builder.clean(patternSelectFunction)).build();
  
  		return process(processFunction, outTypeInfo);
  	}