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https://issues.apache.org/jira/browse/SPARK-11321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237978#comment-15237978
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Apache Spark commented on SPARK-11321:
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User 'kevincox' has created a pull request for this issue:
https://github.com/apache/spark/pull/12335
> Allow addition of non-nullable UDFs
> -----------------------------------
>
> Key: SPARK-11321
> URL: https://issues.apache.org/jira/browse/SPARK-11321
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Reporter: Kevin Cox
> Priority: Minor
>
> It would be really nice if you could create UDFs that had a non-nullable
> return type. This way the schema could continue to match the logical contents
> of the dataframe
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