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https://issues.apache.org/jira/browse/DRILL-3517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634253#comment-14634253
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Ted Dunning commented on DRILL-3517:
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Let's start in these comments:
1) Drill UDF's are not run in the lexical environment that you might think
1.a) imports will just confuse you
1.b) all class references need to be fully qualified
1.c) fields that you define will get left behind
2) Inputs and outputs have to be in *Holder types
3) complex outputs can be created using the ComplexWriter
4) you need to build both source and binary jars. Examples available
Not sure if these are FAQ format anymore.
> Add a UDF development FAQ
> -------------------------
>
> Key: DRILL-3517
> URL: https://issues.apache.org/jira/browse/DRILL-3517
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Documentation
> Reporter: Jacques Nadeau
> Assignee: Bridget Bevens
>
> Lets create a UDF FAQ of common issues, log entries, etc so that people know
> what to do when they hit certain issues.
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