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https://issues.apache.org/jira/browse/SPARK-34191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269364#comment-17269364
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Apache Spark commented on SPARK-34191:
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User 'pgrz' has created a pull request for this issue:
https://github.com/apache/spark/pull/31282
> udf type hint should allow dectorator with named returnType
> -----------------------------------------------------------
>
> Key: SPARK-34191
> URL: https://issues.apache.org/jira/browse/SPARK-34191
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 3.1.0, 3.2.0, 3.1.1
> Reporter: Maciej Szymkiewicz
> Priority: Major
>
> At the moment annotations allow following decorated patterns:
>
> {code:python}
> @udf
> def f(x): ...
> @udf("string") # Or DataType instance
> def f(x): ...
> @udf(f="string") # Awkward but technically valid
> def f(x): ...
> {code}
> We should also support
> {code:python}
> @udf(returnType="string")
> def f(x): ...
> {code}
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