Rachelint commented on PR #15591:
URL: https://github.com/apache/datafusion/pull/15591#issuecomment-4746951932

   > I suggest not trying to parallelize steps 1 and 2, as they will likely 
conflict with each other. Step 3 should be highly parallelizable...
   
   Make sense.
   
   > The performance seems to be a nearly solved issue...
   
   Yes, and I think it seems make slight difference to performance after 
experiment before. 
   https://github.com/apache/datafusion/pull/15591#issuecomment-2890524255
   And I am paying effort to make it able to lead not regression when we 
disable the feature(regression happend due to we need to performance two index 
op even disabling).
   https://github.com/apache/datafusion/pull/15591#issuecomment-4343775983


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