docs: private Stream<Numeric> runComputeMean(GraqlCompute.Statistics.Value query) {
          Map<String, Double> meanPair = runComputeStatistics(query);
          if (meanPair == null) return Stream.empty();
  
          Double mean = meanPair.get(MeanMapReduce.SUM) / meanPair.get(MeanMapReduce.COUNT);
          return Stream.of(new Numeric(mean));
      }