alamb commented on issue #3941:
URL: 
https://github.com/apache/arrow-datafusion/issues/3941#issuecomment-1290676317

   > Should memory limit be optimistic? What I mean is that in case of 
aggregation we could first process record batch, compare memory before and 
after batch is process and request delta value from memory manager. 
   
   Yes, I agree this would be best strategy: as memory is needed, we request 
more memory from  the memory manager incrementally. 
   
   > End of batch processing would be a "safe point" which should have correct 
memory usage, or trigger spill.
   wdyt?
   
   Yes
   
   In general I think upgrading / improving the memory manager would likely be 
fine. 
   


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