berkaysynnada commented on PR #15563:
URL: https://github.com/apache/datafusion/pull/15563#issuecomment-2788800050

   > > Let's make it incremental for consistency.
   > 
   > @berkaysynnada: Looking at this again, I'm pretty sure it should actually 
be `Final`! On partially sorted input, with or without fetch, the SortExec will 
only emit once it has processed all its necessary input data (eventually 
cancelling the input stream early). I've updated the PR with a new fix commit.
   
   PartiallySorted case is actually the same of AggregateExec with an ordered 
group_by key. Final means the operator can only emit results after its inputs 
are fully consumed. 
   
   


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