Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/20372
  
    This PR was merged to RC3 of Spark 2.3. For all such fixes, we should not 
merge them to Spark 2.3. The performance regression has been witnessed in RC3, 
compared with RC2. We did not investigate more. For safety, we have to revert 
it from Spark 2.3 and master.
    
    Maybe you can submit a new PR and make it configurable? Does this sound 
good to you?


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