Liang-Chi Hsieh commented on SPARK-21629:

[~hvanhovell] Sorry, I'm mentoring the few local developers in Taiwan for 
contributing Spark. This looks a trivial PR. May I ask holding this issue for 
one of the mentees? If you don't mind, can you help assign it to me 
temporarily. Thanks!

> OR nullability is incorrect
> ---------------------------
>                 Key: SPARK-21629
>                 URL: https://issues.apache.org/jira/browse/SPARK-21629
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0, 2.1.1, 2.2.0
>            Reporter: Herman van Hovell
>            Priority: Minor
>              Labels: Starter
> The SQL {{OR}} expression's nullability is slightly incorrect. It should only 
> be nullable when both of the input expressions are nullable, and not when 
> either of them is nullable.

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