andimiller opened a new pull request, #10288:
URL: https://github.com/apache/pinot/pull/10288

   # Summary
   
   This implements `ValueAggregator` for the apache datasketches theta `Sketch`.
   
   This should allow `DISTINCT_COUNT_THETA_SKETCH` and 
`DISTINCT_COUNT_RAW_THETA_SKETCH` to be used in `StarTree` indexes.
   
   # Assumptions:
   * The default number of nominal entries is `2 ^ 16`, I haven't made this 
configurable because I wasn't sure which mechanism to use
   * the `_maxByteSize` implementation is similar to the `Bitmap` 
implementation since it can grow a lot
   * unit tests have been added to cover the main methods


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