Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13909
For primitive element type, should we optimize non `UnsafeArrayWriter path?
I mean that we just fill zero into `nullable` and then perform bulkcopy only
for data part by adding a new API to `UnsafeArrayData`. This seems to be better
than element-wise copy.
What do you think?
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