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https://issues.apache.org/jira/browse/BEAM-7787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891103#comment-16891103
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Ismaël Mejía commented on BEAM-7787:
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[~kedin] or [~apilloud] can some of you guys take a look at this one?
> SQL transform crashes when UDF returns a list
> ---------------------------------------------
>
> Key: BEAM-7787
> URL: https://issues.apache.org/jira/browse/BEAM-7787
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Yang Zhang
> Priority: Major
>
> In Beam UDF, is it feasible to return a list? For example, the UDF function
> is defined as (input) String -> (output) List<String>,
> ```public static class UDF implements SerializableFunction<String,
> List<String>>```
>
> I got a nullpointerexception if a list is returned.
>
> Best,
> Yang
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