Kontinuation commented on issue #949:
URL: 
https://github.com/apache/datafusion-comet/issues/949#issuecomment-2363964059

   Yes, the initial memory management 
[proposal](https://docs.google.com/document/d/1BT5HH-2sKq-Jxo51PNE6l9NNd_F-FyyYcyC3SKTnkIA/edit)
 and [implementation](https://github.com/apache/datafusion/pull/1526) did 
support cooperative spilling. However, a later 
[simplification](https://github.com/apache/datafusion/pull/4522) removed that 
feature.
   
   I believe using a shared `FairSpillPool` for comet operators within the same 
task is a reasonable approach, especially since the memory manager currently 
only supports self-spilling. Still, I would love to see cooperative spilling 
return to DataFusion.


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