Julien Le Dem created DRILL-4556:
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Summary: UDF with FieldReader parameter reading union type fails
compilation
Key: DRILL-4556
URL: https://issues.apache.org/jira/browse/DRILL-4556
Project: Apache Drill
Issue Type: Bug
Reporter: Julien Le Dem
select foo(a) from mixed
where a is a union vector (say mixed is a json file where a is a string or an
int)
Foo is a UDF that has one param defined as a FieldReader
the operator compilation fails as the field is produced as a UnionHolder
instead of a FieldReader.
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