Dandandan commented on issue #15601:
URL: https://github.com/apache/datafusion/issues/15601#issuecomment-2781405588

   I don't think it is really redundant. 
   
   The rund robin repartitioning is added to increase parallelism (by 
increasing number of partitions).
   Hash repartitioning does also increase the number of partitions, but the 
hash partitioning itself also benefits of doing the repartitioning in parallel, 
which is why both are present in the plan.
   If we would (somehow) integrate the parallelism inside `RepartitionExec` or 
change how we plan tasks altogether this might be redundant, but this is how it 
works now.


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