Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13680
It is OK to always keep ```[null bits]```
One question: Is this format to keep fixed space for ```[values]```? I mean
if ```[null bit]``` is true, the corresponding element in ```[value]``` occupy
space. It allow us to always access all of the elements by ```4 + (null bits
size) + (element size) * offset```.
If an answer of the above question is yes, I agree with no ```[all zero in
null bits?]```. Then, I will do prototype for this.
cc @hvanhovell
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