Jackie-Jiang opened a new pull request #6004:
URL: https://github.com/apache/incubator-pinot/pull/6004


   ## Description
   Introduce `ThetaSketchAggregationFunction` as an enhanced version of 
`DistinctCountThetaSketchAggregationFunction`, and add the following supports:
   - Support aggregating on raw values of all data types (both SV and MV)
   - Support nested filter (E.g. `A = 1 AND (B = 2 OR C = 3)`)
   - Support filter on all data types (both SV and MV)
   - Support simple union without filters (E.g. `thetaSketch(col)`)
   - Support `$0` as the default sketch (sketch without filter)
   


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