mustafasrepo commented on issue #5133:
URL: 
https://github.com/apache/arrow-datafusion/issues/5133#issuecomment-1460074626

   Hi @xiaoyong-z,  I can receive some of the tasks from the document. 
Specifically I would like to start out with the case. 
   - 1.Implement StreamAggregate that handles pre-sorted data (where the data 
is already sorted according to the grouping keys/ partition keys). (Corresponds 
to 2nd step in the document I guess.)
   
   If you are not working already on this feature.
   


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