Jackie-Jiang opened a new pull request, #15149:
URL: https://github.com/apache/pinot/pull/15149

   Add a distinct count function optimized for high cardinality scenario.
   
   - When dictionary is available, within segment use a `BitSet` to track the 
distinct dictionary ids, then read the values into a shared concurrent set.
   - When there is no dictionary, directly add the values into a shared 
concurrent set.


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