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https://issues.apache.org/jira/browse/DRILL-7366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva updated DRILL-7366:
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Fix Version/s: (was: 1.17.0)
1.18.0
> Improve Null Handling for UDFs with Complex Output
> --------------------------------------------------
>
> Key: DRILL-7366
> URL: https://issues.apache.org/jira/browse/DRILL-7366
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.16.0
> Reporter: Charles Givre
> Priority: Major
> Fix For: 1.18.0
>
>
> If there is a UDF which has a complex field (Map or List) as output, Drill
> does not allow the UDF to have nullable input and it creates additional
> complexity when writing these kinds of UDFs.
> I therefore would like to propose that two options be added to the
> FunctionTemplate for null handling: {{EMPTY_LIST_IF_NULL}}, and
> {{EMPTY_MAP_IF_NULL}} which, would simplify UDF creation. I'm envisioning
> that if either of these options were selected, and the UDF receives any null
> value as input, the UDF will return either an empty map or list.
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