Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13680
@kiszk we should definitely put zero into the corresponding field when set
null. It will be a little harder than `UnsafeRow`, as we need `setNullBoolean`,
`setNullInt`, etc. but it's still doable.
about clear out all null bits, yea, it's a big overhead for array with
small element like boolean array, but I'm not sure this worth 2 different
implementations, cc @rxin
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