Any plan for ZUNION and ZWEIGHTUNION?

[Alex Dong]

Hi Folks,

Wondering are there any plan for a sorted sets union? Or even better,
a weighted sorted sets union?

Here is the scenario. Let's say we have a sorted set for each
blogger's tags, weighted by number of occurrence. A sorted sets union
will quickly tell what are the top 10 tags people A,B,C use? Even
better, if user A is ranked as level 3 whereas B,C level 1, a
weighted union will return better results.

Proposed grammar:
- ZUNION key set-1 set-2 ... set-N
- ZWEIGHTUNION key set-1 weight-1 set-2 weight-2 ... set-N weight-N

In this thread: "SORTSTORE command proposal"
http://groups.google.com/group/redis-db/browse_thread/thread/bbb8c9eddff85cd4/5c302e0e380f9621?lnk=gst&q=union#5c302e0e380f9621
@antirez mentioned that "Instead with sorted sets, there are
algorithms to make this much more faster. ", so any plan for adding
this? If I'd like to add this feature, where shall I start? Are
there any coding guide docs I can explore?

Cheers,
Alex

[Aníbal Rojas]

Alex,

This commands have been discussed in the list, and are in the plans
of Salvatore. Not sure if they are formally in the roadmap.

--
Aníbal Rojas
Ruby on Rails Web Developer
http://www.google.com/profiles/anibalrojas

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[Alex Dong]

If I'd like to add this feature, where shall I start? Are

there any coding guide docs I can explore?

Sure. Any pointer on where I should go to add these features in? 

Alex

[Aníbal Rojas]

Redis Roadmap:

http://github.com/antirez/redis/raw/master/TODO

--
Aníbal Rojas
Ruby on Rails Web Developer
http://www.google.com/profiles/anibalrojas