Github user marmbrus commented on the issue:
    +1 to this feature!  I think this might be the first step in a better story 
for people trying to use `nullable = false` as an enforcement mechanism (I'd 
bring this idea up on 
[SPARK-17939](  A few 
thoughts on what we would need to do to commit this:
     - some tests (and make sure the error messages when you hit nulls make 
sense to a user)
     - as a bonus we could check how this affects the constraints on 
nullability (i.e. does the optimzer know that we can skip future null checks)

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