Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13704
Let me check which code portion inserts ```Cast``` in this tree.
> 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[]```.
This PR generated code without using ```Object[]``` by check the above
condition.
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