Github user kiszk commented on the issue:

    https://github.com/apache/spark/pull/13680
  
    @cloud-fan , for the first issue, we are on the same page. Your proposal is 
what I am thinking about as possible solutions. I will do that.
    
    For the second issue, it seems to be design choice between
    1. introduce one conditional branch in ```isNullAt()``` in one 
implementation
    2. have two implementations without conditional branch at ```isNullAt()```


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