Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13909
After some more thoughts, will it be better to use `UnsafeArrayWriter`
directly? The array elements are evaluated one by one, so theoretically
creating a primitive array and copying it to `UnsafeArray` is also sub-optimal.
With `UnsafeArrayWriter`, we can write array elements to unsafe array one
by one, no copy anymore.
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