justinuang commented on issue #20303: [SPARK-23128][SQL] A new approach to do 
adaptive execution in Spark SQL
URL: https://github.com/apache/spark/pull/20303#issuecomment-459414987
 
 
   @carsonwang I'm curious if you were able to break down the benefits of 
setting the reducer number separately from everything else? We noticed that 
spark sql ended up creating 200 partitions, not the tens of thousands that you 
described in your article, and also that the task overhead wasn't that big.

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