61yao commented on PR #10188:
URL: https://github.com/apache/pinot/pull/10188#issuecomment-1406018026

   > @61yao what you suggest is what this PR does, sorry if it isn't totally 
clear from the description! essentially the leaf servers will send the set of 
distinct values over, and the intermediate servers will reduce it into a count 
+ sum
   > 
   > EDIT: I see where the confusion is, it uses v1 `DISTINCTCOUNT` but does 
not actually do the count part of it (it returns the intermediate state, which 
is just a set of objects)
   
   I see what you mean. I just checked your code and previous PR. Makes sense. 


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