mayankshriv opened a new issue #7887:
URL: https://github.com/apache/pinot/issues/7887


   DistinctCount queries are expensive, especially as selectivity decreases. 
Currently, this can degrade the overall performance across the table. One idea 
preventing overall perf degradation and pileup effect would be to switch 
internally to DistinctCountHLL for distinct values larger than a certain 
threshold. This would be better than simply truncating the collection of 
distinct values.


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