Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/10331#issuecomment-165617207
@liancheng Regarding the scope of this jira, my understanding is that when
we create JVM objects, if there is any null values and we are trying to set
them to primitive fields of the class, we should throw a Runtime exception to
ask them to use Option or non-primitive JVM type (e.g. java.lang.Integer
instead of Int). This is a runtime check. For example, we want to encode a row
to a case class `case class TestData(a: Int)`. If the first value of a row is
`null`, we should throw the Runtime exception when we try to create a
`TestData` instance because `a` is a primitive type field.
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