alamb commented on issue #3140:
URL: 
https://github.com/apache/arrow-datafusion/issues/3140#issuecomment-1217775174

   I wonder if this could be related to "floating point error" error 
accumulation -- namely that floating point operations are approximations and 
can produce different values if executed in different order.
   
   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 🤔 
   


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