Github user dongjoon-hyun commented on the pull request:

    https://github.com/apache/spark/pull/13145#issuecomment-219687641
  
    Thank you for review, @srowen .
    Probably, there exists similar cases in other modules, too.
    
    But, for the other module, I guess the patterns are simple and the most 
complex pattern matchings are used in optimizers due to the nature of 
optimization. Also, until now, it seems there exists no suitable automatic tool 
 for doing for all of the code base. When I searched for this, I found that 
Scala open issue for this; https://issues.scala-lang.org/browse/SI-8040 .


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