kosiew commented on PR #22639:
URL: https://github.com/apache/datafusion/pull/22639#issuecomment-4707010768

   @Jefffrey 
   Thanks for the feedback. I've updated the approach accordingly:
   
   * Removed the new 
`functions-aggregate-common::aggregate::groups_accumulator::avg` module and 
kept the implementation within the existing AVG codepath.
   * Folded Spark grouped AVG into a built-in AVG grouped accumulator 
implementation
   * Preserved the existing state contracts:
   
     * Spark AVG: `[sum, count]` with `Int64` counts
     * Built-in AVG: `[count, sum]` with `UInt64` counts
   


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