Github user mn-mikke commented on the issue:
https://github.com/apache/spark/pull/21704
@ueshin Thanks for bringing this topic! This problem with different
```nullable```/```containsNull``` flags seems to be more generic. In
[21687](https://github.com/apache/spark/pull/21687), we've touched a similar
problem with ```CaseWhen``` and ```If``` expression. So I think It would nice
if we could think together about a generic and consistent solution for all
espressions. WDYT?
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