petermarshallio opened a new pull request, #14523:
URL: https://github.com/apache/druid/pull/14523

   A notebook on counting unique values in a data set, using both 
non-approximate and approximate techniques - both HLL and Theta.
   
   ---
   
   This PR has:
   
   - [X] been self-reviewed.
   - [X] been tested in a test Druid cluster.
   - [] been tested in the notebooks Docker
   


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