[I] Skip the merge wrapper for single-file partitions [datafusion-comet]

["parthchandra (via GitHub)" <gi...@apache.org>]

parthchandra opened a new issue, #5341:
URL: https://github.com/apache/datafusion-comet/issues/5341

   ### What is the problem the feature request solves?
   
   Follow up for #5323
   
     When a partition has only one file, we still wrap the scan in SortPreservingMergeExec, which is a no-op merge. We can skip the wrapper in that case to avoid the small overhead.
   
   
   ### Describe the potential solution
   
   _No response_
   
   ### Additional context
   
   _No response_


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