Github user tarekauel commented on the pull request:

    https://github.com/apache/spark/pull/6804#issuecomment-113029712
  
    Yeah, that's a good comment. I checked the String expressions and it does 
already the null check, see
    
    
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala#L173-L182
    
    So it won't be null and a valid result will be provided, if a value is 
null. I think the result is even better, because it returns null and not false 
which is way better.


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