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https://issues.apache.org/jira/browse/SPARK-11321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15214442#comment-15214442
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Kevin Cox commented on SPARK-11321:
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Are there any updates on this. It would be nice to have the option to have the
schema better represent our data.
> 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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