dongjoon-hyun commented on issue #23914: [SPARK-27009] Add Standard Deviation 
to Benchmark tests
URL: https://github.com/apache/spark/pull/23914#issuecomment-468067032
 
 
   Thank you for your first contribution, @yifeih . BTW, `standard deviation` 
is a useful value in general, but I'm wondering if this is useful here in the 
row of the benchmark. What is your purpose for this?

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