Github user ueshin commented on the pull request: https://github.com/apache/spark/pull/3150#issuecomment-62118596 @chenghao-intel, Thank you for your comments. If `resolve` method is removed, the nullability check (e.g. cast from `ArrayType(IntegerType, containsNull = true)` to `ArrayType(IntegerType, containsNull = false)` is apparently invalid) is also removed and it will cause unexpected errors. If there is a better way to ensure the nullability check, we can remove the method.
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