Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/9440#issuecomment-153629098
I think the patch is not appropriate because it does not pass regression
test and will produce error in other test cases. I have found the cause of this
bug, but not figure out a way to resolve it. Please see my comments at
[SPARK-11478](https://issues.apache.org/jira/browse/SPARK-11478). I think
disable ```nullable``` check is a workaround, looking forward to others'
opinions. @rekhajoshm @mengxr
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