Github user kiszk commented on the issue: https://github.com/apache/spark/pull/13680 To use negative is for ease of debugging. We could use positive value, too. Is the positive value preferable to you? > This is fine. We zero out the null field instead of leaving some random bytes there because we wanna make sure equality is deterministic. The new rule(using next offset for null element) is also deterministic. Sure, that makes sense. I have implemented it in my environment already. When we decide to use positive or negative value, I will push it soon.
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