Github user rxin commented on the issue:

    https://github.com/apache/spark/pull/15713
  
    @a-roberts feel free to continue investigating, but at some point it's also 
important to ask the question: is this micro-optimization worth it? It only 
improves 4% for a very specific workload based on your measurement, and might 
regress other workloads but we are not sure about that. It also takes time from 
a lot of people to look at ...



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