Dandandan commented on PR #13133:
URL: https://github.com/apache/datafusion/pull/13133#issuecomment-2445183293

   @alamb 
   
   > Does this PR make SortPreservingMergeExec unstable?
   
   If I read the explanation:
   
   > Note Stable Sort: the merged stream places equal rows from stream 1
   
   This still is the case, equal rows from the same stream are still in the 
same order.
   Rows from different streams/partitions can be placed differently, but there 
already is no guarantee for a particular ordering from a number of streams I 
believe?


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