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https://issues.apache.org/jira/browse/DRILL-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julien Le Dem updated DRILL-4556:
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Issue Type: Sub-task (was: Bug)
Parent: DRILL-4538
> 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: Sub-task
> 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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