docs: public <R> SingleOutputStreamOperator<R> process(final PatternProcessFunction<T, R> patternProcessFunction) {
  		final TypeInformation<R> returnType = TypeExtractor.getUnaryOperatorReturnType(
  			patternProcessFunction,
  			PatternProcessFunction.class,
  			0,
  			1,
  			TypeExtractor.NO_INDEX,
  			builder.getInputType(),
  			null,
  			false);
  
  		return process(patternProcessFunction, returnType);
  	}