Ted-Jiang commented on issue #3140:
URL: 
https://github.com/apache/arrow-datafusion/issues/3140#issuecomment-1217788354

   >Given operations like repartitoning and thread ordering, I don't think 
there is any guarantee that a particular operator will see the same data in the 
same order if the same query is run more than once 
   
   Agree! this only happen in multi files which includes different partition 
finish order.  I think `T-digest` merge in final aggregation  is like "floating 
point error" different input order return different result.


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