Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13704
> the `Cast` performs conversion from `UnsafeArrayData` to
`GenericArrayData`.
`Cast` is used to cast one type to another, not cast one kind of data
representation to another, so I don't quite understand why the `Cast` is there.
> This code generation always creates `Object[]` and assign values into
each `Object[]` element.
This is reasonable, as it needs to take care of null elements. And we do
have a chance to optimize it: if the target array type's element type is
primitive and the input array type's element nullability is false, we can avoid
using `Object[]`.
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