Jackie-Jiang commented on issue #8983:
URL: https://github.com/apache/pinot/issues/8983#issuecomment-1171167607

   The challenge here is that the intermediate result (e.g. `list` for 
`percentile`) must be of the same type of the input. In order to support any 
aggregation function, we need to figure out a way to store the intermediate 
result as a separate column (similar to star-tree). The query engine needs to 
smartly choose the intermediate result column to aggregate on. We also need to 
decide what value to put in the original column (or not allow querying it 
directly).


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