xavlee commented on PR #24697:
URL: https://github.com/apache/datafusion/pull/24697#issuecomment-6204687459

   clustering != sorted, so we cannot assume an input is sorted for 
SortPreservingMerge based on the clustering. Existing use cases of 
SortPreservingMerge remain unaffected since ordering metadata is preserved. 
   
   Clarification- we could have an input that is _clustered and sorted_ 
(sorting implies clustering), which would allow us to use SortPreservingMerge. 


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