Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13680
Thanks for working on it! One of my concern is: do we really need 2 unsafe
array implementations? For the `UnsafeArrayDataDense`, can we follow unsafe row
and introduce a null-bits to make it support null value? Then we can have a
unified format: `[numElements] [null bits] [offset or primitive values]
[values]`
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