westonpace commented on PR #33738:
URL: https://github.com/apache/arrow/pull/33738#issuecomment-1386613911

   Example Plan Trace:
   
   
![image](https://user-images.githubusercontent.com/1696093/213111094-855859cd-d270-4b41-9e0a-e47fc5152fa4.png)
   
   Note: I can already see something I find rather interesting in the above 
trace.  The final pipeline calls `ScalarAggregateNode::Finish` which finalizes 
the aggregates and calls `SinkNode::InputReceived`. Admittedly, finalizing 
aggregates is not much work, however, all `InputReceived` should be doing is 
pushing the batch onto a queue.  I'm surprised how much longer it takes to run 
`InputReceived`.


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