Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/12337
+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](https://issues.apache.org/jira/browse/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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