avantgardnerio commented on PR #7192:
URL: 
https://github.com/apache/arrow-datafusion/pull/7192#issuecomment-1684178948

   > Support non-String ID
   
   Hopefully we can do this in a follow-on PR
   
   > Remove SortOptions from HeapItem
   
   It was there because I misunderstood how MIN() and MAX() handle NULLs.
   
   > See if we can further reduce allocations - flamegraph[1] suggests a large 
part of the time in the aggregation is spent doing allocations both in btree 
and outside of it
   
   I would definitely like to do this, but in the next PR where we replace the 
`BTreeSet` entirely with a custom heap impl.
   
   > Misc cleanups
   
   I've addressed all the ones mentioned above. Please let me know if there are 
any others and I will handle those too,.


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