[GitHub] [incubator-druid] jon-wei commented on issue #7337: DataSketches HLL is not a replacement for Cardinality aggregator

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jon-wei commented on issue #7337: DataSketches HLL is not a replacement for Cardinality aggregator
URL: https://github.com/apache/incubator-druid/issues/7337#issuecomment-479677347
 
 
   > If there is some capability missing in terms of row/column scanning it has
   to do with how the sketches are being integrated into Druid, which is out
   of our expertise and out of our scope.  We certainly could use your help in
   getting these sketches properly integrated into Druid!
   
   The Theta and HLL sketches could be adjusted to accept multiple columns at the aggregator, I can take a look at implementing that sometime before 0.15.0 code freeze, I'm looking into exposing the Theta set operations for use in Druid SQL as well.

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