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https://issues.apache.org/jira/browse/SPARK-21629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115702#comment-16115702
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Liang-Chi Hsieh commented on SPARK-21629:
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No problem. Mentees still learn something.
> 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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