Github user yanboliang commented on the issue:

    https://github.com/apache/spark/pull/18902
  
    @hhbyyh @zhengruifeng I'm ok with the _convert to null_ method, I think 
there is no extra pass for data if we handle it with this way, and the 
DataFrame/RDD functions to compute _mean/median_ will ignore _null_ . Thanks.


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