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https://issues.apache.org/jira/browse/FLINK-22297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17324096#comment-17324096
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Dian Fu commented on FLINK-22297:
---------------------------------
After debugging of this problem, I found that the issue described in
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/PyFlink-called-already-closed-and-NullPointerException-td42997.html
isn't caused by the same reason as
http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/PyFlink-Vectorized-UDF-throws-NullPointerException-td42952.html.
Have created FLINK-22327 to track it.
> Perform early check to ensure that the length of the result is the same as
> the input for Pandas UDF
> ---------------------------------------------------------------------------------------------------
>
> Key: FLINK-22297
> URL: https://issues.apache.org/jira/browse/FLINK-22297
> Project: Flink
> Issue Type: Improvement
> Components: API / Python
> Reporter: Dian Fu
> Assignee: Dian Fu
> Priority: Major
>
> For Pandas UDF, the input type for each input argument is Pandas.Series and
> the result type is also of type Pandas.Series. Besides, the length of the
> result should be the same as the inputs. If this is not the case, currently
> the behavior is unclear. We should perform early check for this and provide a
> clear error message.
> See
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/PyFlink-Vectorized-UDF-throws-NullPointerException-td42952.html
> and
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/PyFlink-called-already-closed-and-NullPointerException-td42997.html
> for more details.
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