presto-main/src/main/java/io/prestosql/operator/aggregation/MergeQuantileDigestFunction.java/MergeQuantileDigestFunction/output
class MergeQuantileDigestFunction:    public static void output(QuantileDigestStateSerializer serializer, QuantileDigestState state, BlockBuilder out)
    {
        serializer.serialize(state, out);
    }