presto-main/src/main/java/io/prestosql/type/setdigest/MergeSetDigestAggregation.java/MergeSetDigestAggregation/input
class MergeSetDigestAggregation:    @InputFunction
    public static void input(SetDigestState state, @SqlType(SetDigestType.NAME) Slice value)
    {
        SetDigest instance = SetDigest.newInstance(value);
        merge(state, instance);
    }