Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19601
After I think about the choice for a while, I conclude that it is better to
add the new `WritableColumnVector` (i.e. `UnsafeColumnVector`) and to keep the
current `ColumnVector.Array`.
I think that to add a new class will give us some flexibility and good
abstraction between public class `ColumnVector` and other internal classes.
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