SQL should support complex types for UDF and have documentation
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sql
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- Java
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Description
In Beam UDF, is it feasible to return a list? For example, the UDF function is defined as (input) String -\> (output) List,
```public static class UDF implements SerializableFunction\>```
I got a nullpointerexception if a list is returned.
Best,
Yang
Imported from Jira [BEAM-7787](https://issues.apache.org/jira/browse/BEAM-7787). Original Jira may contain additional context.
Reported by: yangzhang.
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