alamb commented on PR #5292:
URL: 
https://github.com/apache/arrow-datafusion/pull/5292#issuecomment-1475220254

   I ran some profiling of using `datafusion-cli` to run this query
   
   ```sql
   create table  test as select * from  '/tmp/logs.parquet' ORDER BY 
request_method;
   ```
   
   Here is the flamegraph that came from  
[`hotspot`](https://github.com/KDAB/hotspot). I tried to annotate it the best I 
can but I am not quite sure  how to explain it
   
   ![Screenshot 2023-03-19 at 7 12 57 
AM](https://user-images.githubusercontent.com/490673/226172274-faff0bb2-3c0e-438b-bac6-f8c02796d10f.png)
   
   I haven't had a chance to study this PR in detail -- but I think we are at 
the point where we should profile the benches / queries that got slower and 
figure out what is going on.
   
   Given we don't have much (any?) measurements showing a performance 
improvement I feel like something else must be going on


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