mustafasrepo commented on PR #8998:
URL: 
https://github.com/apache/arrow-datafusion/pull/8998#issuecomment-1911543032

   > Thanks @mustafasrepo but just for curiosity, how the test becomes 
deterministic if only test result has changed? 🤔 no extra sorting or code change
   
   In this PR, I have changed source table such that timestamp values are 
unique. Since each group consists of distinct rows, `MIN(timestamp)`, or 
`MAX(timestamp)` would produce unique results after aggregation (e.g different 
for each row). Hence when ordering `ORDER BY MIN(timestamp)` is applied there 
is no tie break (where there may be more than 1 true result).


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