xavlee commented on PR #24697:
URL: https://github.com/apache/datafusion/pull/24697#issuecomment-5987744135

   Hi @2010YOUY01, thanks for the review 🙂. If no other optimization currently 
depends on the existing sorting guarantee, then the practical alternative you 
mentioned seems tenable -- we can extend the model should a use case for 
ordering arises. 
   
   I've updated this PR in the three ways you mentioned:
   - renamed `ordering` to `completion_mode`
   - replaced folded order/completion mode into the single 
`GroupCompletionMode` instead of maintaining both
   - Renamed `ordered_*_stream` to `clustered_*_stream`
   
   One naming question: would you prefer to rename `GroupCompletionMode` to 
`GroupClusteringMode` to align with the clustering terminology you suggested?


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