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https://issues.apache.org/jira/browse/DRILL-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905362#comment-16905362
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Igor Guzenko commented on DRILL-7345:
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Hi [~cgivre], could you please check that the issue is not caused by changes
which was added as part of DRILL-6810 ?
[Here|https://github.com/apache/drill/blob/85c77134d5d1bb9f96a5417036cccfb263ae8ae7/exec/java-exec/src/main/java/org/apache/drill/exec/expr/annotations/FunctionTemplate.java#L150]
in javadoc described some limitations related to ComplexWriter output.
> Strange Behavior for UDFs with ComplexWriter Output
> ---------------------------------------------------
>
> Key: DRILL-7345
> URL: https://issues.apache.org/jira/browse/DRILL-7345
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.17.0
> Reporter: Charles Givre
> Priority: Minor
>
> I wrote some UDFs recently and noticed some strange behavior when debugging
> them.
> This behavior only occurs when there is ComplexWriter as output.
> Basically, if the input to the UDF is nullable, Drill doesn't recognize the
> UDF at all. I've found that the only way to get Drill to recognize UDFs that
> have ComplexWriters as output is:
> * Use a non-nullable holder as input
> * Remove the null setting completely from the function parameters.
> This approach has a drawback in that if the function receives a null value,
> it will throw an error and halt execution. My preference would be to allow
> null handling, but I've not figured out how to make that happen.
> Note: This behavior ONLY occurs when using a ComplexWriter as output.
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