Github user jacek-lewandowski commented on the pull request:

    https://github.com/apache/spark/pull/5977#issuecomment-100158160
  
    I don't agree with this - you already use such notation in a few places 
(for Idea search for `\d+\sseconds` except comments and string literals shows 
16 usages for production code and 71 usages for test code, search for usages of 
dot-less notation of `===` method shows 4k+ usages).
    
    Although I can see the benefits of this style guide item for the production 
code, I cannot understand how it could be forbidden for test code? How would 
you use "should matchers" without this notation? Scala test frameworks are 
designed to use dot-less notation to improve readability and understanding of 
test cases, as well as to decrease unneeded verbosity. 



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