Github user HeartSaVioR commented on the issue:
https://github.com/apache/spark/pull/21700
@tedyu Thanks for the suggestion. Published the result to the mail thread.
https://lists.apache.org/thread.html/323ab22fea87c14a2f92e58e7a810aa37cbdf00b9ab81448ee967976@%3Cdev.spark.apache.org%3E
I've only written a short summary of the result (since mail may not be a
good format to describe detailed numbers rather than markdown) and spend more
time to explain the rationalization of my recent issues so that all of them are
being covered together. I'll wait more a couple of days, and try to put
detailed numbers if things are not started reviewing until then.
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