[GitHub] [incubator-druid] AlexanderSaydakov commented on issue #7297: thetaSketch aggrgator handle null or "" into unexpected value at ingesting

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AlexanderSaydakov commented on issue #7297: thetaSketch aggrgator handle null or "" into unexpected value at ingesting 
URL: https://github.com/apache/incubator-druid/issues/7297#issuecomment-474460432
 
 
   Theta sketch ignores nulls and empty strings. Are you sure your input is really empty, not, say, a strings with some spaces in them?
   
   Regarding the difference between Theta and HLL. You can chose the accuracy you wish. Assuming the same accuracy, HLL sketches are substantially smaller than Theta, but don't support set operations (intersection and set difference), and may be slower to merge (union).

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