Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/15960
  
    Of course it's better to not use interpolation where there is no 
interpolation, but yes I wonder how much benefit there is to changing every 
single instance, because of the back-porting issue.
    
    This pointless interpretation does have a runtime impact, so I could see 
making this change in non-test code in any section where performance is 
important.
    
    I do like consistent style, good practices, and enforcing them 
automatically. We can't enforce this unless all the code complies 
unfortunately. 
    
    I would support fixing this in any important section of code and am neutral 
about changing it all.


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