Github user tdas commented on the issue:

    https://github.com/apache/spark/pull/15093
  
    @HyukjinKwon @srowen 
    This PR when merged into branch-2.0 somehow created an empty file 
QuantileSummaries.scala that is failing the lint test as the Apache license 
header does not exist - 
    Commit - 
https://github.com/apache/spark/commit/a3bba372abce926351335d0a2936b70988f19b23
    Empty file - 
https://github.com/apache/spark/blob/a3bba372abce926351335d0a2936b70988f19b23/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/QuantileSummaries.scala
    
    I am not sure how exactly backporting a patch led to an empty file, but 
this does not seem right. I am reverting this commit in branch 2.0. Please make 
a new PR to fix this in branch 2.0 correctly.
    



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