Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/1346#issuecomment-50576308
@chenghao-intel `containsNull` and `valueContainsNull` can be used for
further optimization. For example, let's say we have an `ArrayType` column and
the element type is `IntegerType`. If elements of those arrays do not have
`null` values, we can use a primitive array internal. Since we will expose data
types to users, we need to introduce these two booleans with this PR. It can be
hard to add them once users start to use these APIs.
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