presto-main/src/main/java/io/prestosql/sql/analyzer/FeaturesConfig.java/FeaturesConfig/setHistogramGroupImplementation
class FeaturesConfig:    @Config("histogram.implementation")
    public FeaturesConfig setHistogramGroupImplementation(HistogramGroupImplementation groupByMode)
    {
        this.histogramGroupImplementation = groupByMode;
        return this;
    }