Github user kiszk commented on the issue:

    https://github.com/apache/spark/pull/19598
  
    I see. It makes sense for debugability. On the other hand, the NULLable 
property in schema is very important for optimizations to achieve better 
performance.
    
    One of ideas is to add conf for debug mode to enforce insertion of null 
check at reading data from an iterator or column vector.
     


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