alamb commented on issue #2620:
URL: 
https://github.com/apache/arrow-datafusion/issues/2620#issuecomment-1165620421

   > How do you think about this trade-off
   
   I think it may be quite challenging to implement all the rewrite rules in 
parallel like this, though it would be interesting to try.
   
   In terms of efficiency, I think it would be worth profiling to see if the 
optimizer it taking significant time and if so if there are any tall poles that 
can be addressed (having each pass make a `clone()` of the input plan would be 
one thing I suspect could be improved)


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