adarshsanjeev commented on PR #15162:
URL: https://github.com/apache/druid/pull/15162#issuecomment-1784597049

   @gianm Thanks for running perf tests on this PR! I've tried running a perf 
test on a sketch column with ~20M empty sketches and observed somewhat 
comparable results.
   
   Regarding the PR, while testing, I've noticed one issue with MSQ and 
estimation on an empty sketch, returning null instead of 0 after this change. 
I'll look into resolving it.


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