leerho edited a comment on issue #7607: thetaSketch(with sketches-core-0.13.1) 
in groupBy always return value no more than 16384
URL: 
https://github.com/apache/incubator-druid/issues/7607#issuecomment-490296041
 
 
   @pzhdfy 
   
   Just to double check I have run characterization tests against the Theta 
Union sketch (0.13.1) using both datum updates as well as sketch updates, both 
on-heap and off-heap.  
   
   These tests exercise a 4K sketch up to a million uniques and all 4 test 
suites produce the same identical accuracy pitch-fork plot as follows:
   
   
![ThetaUnionAccuracy1](https://user-images.githubusercontent.com/12941506/57339918-75a54600-70e8-11e9-92b8-e709c46cb2ef.png)
   
   The plot looks a little noisy because I am only running 1024 trials at each 
point.  This is an absolutely normal accuracy characterization plot and well 
within accuracy specifications.  
   
   Unless you can provide more clarity and information as to how you are using 
the sketch there is nothing else we can do.
    

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