Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/3110#issuecomment-62218262
If two `ArrayType`s are only different from the `containsNull`, we do not
need to actually cast array values, right? Since `containsNull`, `nullable` and
`valueContainsNull` are mainly used for optimizations, can we just add some
Hive specific logics in `PreInsertionCasts`?
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