Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13680
I don't have a strong preference here, each choice has its advantage and
weakness:
1. alway have the null bits region: faster element access(read the null
bits and then read the element), slower writing(always need to clear out the
null bit region for primitive array)
2. only have null bits region if `containsNull` flag is true: slower
element access(read flag then read null bits then read the element), faster
writing(check the `containsNull` flag and don't need to clear out null bits if
flag is false)
cc @davies
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