[I] Keep read concurrency in the sorted merge path [datafusion-comet]

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

parthchandra opened a new issue, #5340:
URL: https://github.com/apache/datafusion-comet/issues/5340

   ### What is the problem the feature request solves?
   
   Follow up for #5323 
   The merge reads files more lazily than today's unordered read, which reads many files at once. For a few large files per partition this is fine, but many small files per partition could be slower.
   
   We need to benchmark both cases, and if many-small-files regresses, then implement a fix - read ahead each file into a small bounded buffer (like Comet's repartition) so all files are read while the merge consumes them.
   
   
   ### Describe the potential solution
   
   _No response_
   
   ### Additional context
   
   _No response_


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