alamb commented on issue #13692:
URL: https://github.com/apache/datafusion/issues/13692#issuecomment-2527827318

   
   > It's relatively easy to, at a low level, know where IO calls are 
happening. In fact Tokio lets you configure the runtime to panic if you do IO 
at all (which makes it easy to be almost completely certain you didn't miss a 
spot)
   
   Yes, agree broadly speaking with @adriangb 
   
   Almost all of DataFusion's code is CPU bound and as @tustvold  and others 
have observed before the locations where IO is done is (relatively) isolated in 
comparison. 
   
   I can try to take another shot at 
https://github.com/apache/datafusion/pull/13690 to more fully annotate IO in 
DataFusion. 


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