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https://issues.apache.org/jira/browse/SPARK-23141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16330100#comment-16330100
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Apache Spark commented on SPARK-23141:
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User 'ueshin' has created a pull request for this issue:
https://github.com/apache/spark/pull/20307
> Support data type string as a returnType for registerJavaFunction.
> ------------------------------------------------------------------
>
> Key: SPARK-23141
> URL: https://issues.apache.org/jira/browse/SPARK-23141
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Affects Versions: 2.3.0
> Reporter: Takuya Ueshin
> Priority: Major
>
> Currently {{UDFRegistration.registerJavaFunction}} doesn't support data type
> string as a returnType whereas {{UDFRegistration.register}}, {{@udf}}, or
> {{@pandas_udf}} does.
> We can support it for {{UDFRegistration.registerJavaFunction}} as well.
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