Apologies - I mixed up which user group I was reading. I thought I was in
the druid users group, and distracted attention from the original question.
Apologies again,
Ben
On Wed, Jan 12, 2022 at 11:09 PM leerho <lee...@gmail.com> wrote:
> I'd have to think about it more. But the FDT sketch was put in the
> library as an example. With tuple sketches you would have to write the
> code that encapsulates the tuple summary cells to do what you want and then
> extend the summary aggregator to do the proper merge operations. So in a
> sense the generic Tuple sketch provides the underlying machinery to handle
> the approximate sampling and then you fill in the generic tuples with the
> proper aggregator (perhaps another sketch) and set the union aggregator
> function to properly feed those functions. So many such ideas are
> potentially feasible, it just might require some serious thought about what
> exactly you want it to do, and then code it and try it.
> Cheers,
> Lee.
>
> On Fri, Jan 7, 2022 at 12:04 AM liupeng_wx <liupeng...@qq.com> wrote:
>
>> hi all:
>>
>> i have a question at Frequent Distinct Tuples Sketch。 a multiset
>> of tuples with N dimensions {d1,d2, d3, …, dN}，FDT could base on any of
>> dimensions and approximate count distinct left dimensions。eg: *select
>> appromate group by(d1,d2),count distinct {d2,...dn} from sketches group
>> by **(d1,d2)*。 is there a way to group any of dimensions and count
>> distinct any of left dimensions, eg: *select appromate group
>> by(d1,d2),count distinct d3 from sketches group by (d1,d2)*
>>
>>
>>
