xiangfu0 opened a new pull request, #17186:
URL: https://github.com/apache/pinot/pull/17186

   HLL++ is probabilistic and may under/over-estimate. 
   The randomized test now allows 10% or ≥1 deviation between approximate and 
exact cardinality. 
   Removed the prior 10% upward bias in 
NoDictColumnStatisticsCollector.getCardinality() to avoid systematic 
overestimation and reduce flakiness.


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