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