Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13680
Ah, you are right. Exactly, [this
code](https://github.com/apache/spark/blob/master/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MiscFunctionsSuite.scala#L150)
writes ```UTF8``` elements into only some fields, and write ```null``` into
other fields in ascending order. E.g. ```(4-bit nullbits)[0010] [offset0]
[offset1] [0] [offset3]```.
We could change it into ```(4-bit nullbits)[0010] [offset0] [offset1]
[-offset3] [offset3]```. But, it fills `non-zero` into a field that have
```null```. Is it acceptable? If this property is acceptable, I will do that.
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