alamb commented on issue #20601:
URL: https://github.com/apache/datafusion/issues/20601#issuecomment-3986917766

   I am now confident I have a reasonable ClickBench testing setup and can 
reproduce the 
   
   If you want to check it out, here is the result: 
[result-53.zip](https://github.com/user-attachments/files/25694276/result-53.zip)
 (unzip and open index.html)
   
   Some findings:
   ## DataFusion 47 results are reproducible:
   <img width="1680" height="267" alt="Image" 
src="https://github.com/user-attachments/assets/3ded8f03-d142-480a-bc6a-9d3991682e3d";
 />
   
   ## DataFusion vs DuckDB
   
   Here is what the results for DataFusion 53 will look like compared to DuckDB:
   
   <img width="663" height="995" alt="Image" 
src="https://github.com/user-attachments/assets/d5ccde8f-e945-49a8-8dca-9588fd9b4fe0";
 />
   
   The most obvious problem is Q23, our old friend 
https://github.com/apache/datafusion/blob/a5f490e4c31125b8126105385c6c1120cb2fa2de/benchmarks/queries/clickbench/queries/q23.sql#L4
   
   <img width="841" height="285" alt="Image" 
src="https://github.com/user-attachments/assets/5d2bbb58-f357-43fb-931e-de6790590db6";
 />
   
   This will be resolved by turning on filter pushdown (w/ dynamic filters
   - https://github.com/apache/datafusion/issues/3463
   
   The next slowest is Q29
   
   
https://github.com/apache/datafusion/blob/a5f490e4c31125b8126105385c6c1120cb2fa2de/benchmarks/queries/clickbench/queries/q29.sql#L4
   
   <img width="559" height="154" alt="Image" 
src="https://github.com/user-attachments/assets/c0e4fdb1-ee60-4beb-ae90-b2bdc1913e9a";
 />
   
   Where I think we will just have to hold our nose and implement the 
ClickBench special optimization 💩 
   - https://github.com/apache/datafusion/issues/15524
   
   I am not going to spend a lot more time reviewing results until we get 
[morsel driven scan](https://github.com/apache/datafusion/pull/20481) from 
@Dandandan over the line
   
   
   


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