caseykneale commented on issue #7373:
URL: 
https://github.com/apache/arrow-datafusion/issues/7373#issuecomment-1689917291

   @Dandandan Thanks for the reply. If you read my second comment I think the 
main thing here is adding documentation about how using `ORDER BY` post joins 
may be necessary to get deterministic ordering for operations such as groupbys. 
I think this is somewhat known/implied for technologies similar to this, but 
its a gotchya that people may forget about and is probably worth mentioning. 
Maybe just a section in the SQL capabilities docs about the differences between 
DF and a typical SQL DB would be useful.
   
   Feel free to close this issue out at your own discretion.


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