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https://issues.apache.org/jira/browse/SPARK-20668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16002090#comment-16002090
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Apache Spark commented on SPARK-20668:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/17911
> Modify ScalaUDF to handle nullability.
> --------------------------------------
>
> Key: SPARK-20668
> URL: https://issues.apache.org/jira/browse/SPARK-20668
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Takuya Ueshin
>
> When registering Scala UDF, we can know if the udf will return nullable value
> or not. {{ScalaUDF}} and related classes should handle the nullability.
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