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https://issues.apache.org/jira/browse/DRILL-3517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634258#comment-14634258
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Ted Dunning commented on DRILL-3517:
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More in the line of FAQ's:
1) my UDF didn't get loaded. What happened?
- see the log
- you probably have a subtle error related to the lexical environment
2) my UDF got loaded, but didn't get used. What happened?
- you may not have the right types/may need more type variants
3) Is there an example of a simple transforming UDF?
4) Is there a sample of a UDAF?
5) How can I use my own types as temporary data in my UDAF?
6) I defined fields in my class that implements a UDF, but I get a compile
error that says that they are undefined. Heh?
7) How can I see the generated code that includes my UDF?
> 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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