Rachelint commented on PR #15591:
URL: https://github.com/apache/datafusion/pull/15591#issuecomment-2854237216

   > FWIW the machine I am running this benchmark on has 16 not very good cores
   
   OK, it may be really related to `target_partitions`.
   I also found only slight improvement in my local when `target_partitions = 
16` (default to cpu num).
   
   The `target_partitions` is large, so `intermediate results Vec` in 
`partition` will be small, so `blocked approach` make few difference.


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