Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10259#issuecomment-163796308
I tried use `java.lang` types and the result look good.
@davies how about we update our doc (the `Data Types` section) to explain
that those primitive types are not nullable. Specially, for those scala
primitive types, even if users provide null, scala will convert them to the
default value. We can do the doc update in another PR.
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