Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18014
I think option 2 is better. `ColumnVector.getArray()` should be as fast as
possible. The caller side may just get an element from this array and then the
final projection doesn't need to copy an array.
But if we do need to copy the array in the final projection, we should also
speed it up by bulk copy.
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