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https://issues.apache.org/jira/browse/SPARK-22106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16177066#comment-16177066
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Apache Spark commented on SPARK-22106:
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User 'BryanCutler' has created a pull request for this issue:
https://github.com/apache/spark/pull/19325
> Remove support for 0-parameter pandas_udfs
> ------------------------------------------
>
> Key: SPARK-22106
> URL: https://issues.apache.org/jira/browse/SPARK-22106
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Affects Versions: 2.3.0
> Reporter: Bryan Cutler
>
> SPARK-21190 Added support for vectorized pandas_udfs and allows a 0-parameter
> udf to be created, but it must accept **kwargs to get the correct length of
> the vector to return. This behavior is a confusing and awkward to implement
> and the overall pandas_udf usage would be much cleaner if this was not
> allowed.
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