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:  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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