presto-benchmark/src/main/java/io/prestosql/benchmark/HashAggregationBenchmark.java/HashAggregationBenchmark/HashAggregationBenchmark
class HashAggregationBenchmark:    public HashAggregationBenchmark(LocalQueryRunner localQueryRunner)
    {
        super(localQueryRunner, "hash_agg", 5, 25);

        Metadata metadata = localQueryRunner.getMetadata();
        doubleSum = metadata.getAggregateFunctionImplementation(metadata.resolveFunction(QualifiedName.of("sum"), fromTypes(DOUBLE)));
    }