presto-main/src/main/java/io/prestosql/operator/aggregation/MergeHyperLogLogAggregation.java/MergeHyperLogLogAggregation/output
class MergeHyperLogLogAggregation:    @OutputFunction(StandardTypes.HYPER_LOG_LOG)
    public static void output(@AggregationState HyperLogLogState state, BlockBuilder out)
    {
        serializer.serialize(state, out);
    }