avantgardnerio commented on PR #22834:
URL: https://github.com/apache/datafusion/pull/22834#issuecomment-4662659057

   > it doesn't use a memory pool at all
   
   It does not. And at this point I have an honest question: what is the 
`MemoryPool` for?
   
   We've established it doesn't prevent OOMs, and that it's not easy to keep 
accurate. Is there a reason for tracking in-flight batches I'm not seeing?


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