Charles Givre created DRILL-7366:
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Summary: 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
Fix For: 1.17.0
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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