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https://issues.apache.org/jira/browse/DRILL-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633744#comment-14633744
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Jacques Nadeau commented on DRILL-3516:
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Notes from Stefan from Thread:
- Source code needs to be included in the jar
- it's used when the drillbits/queries are built/orchistrated
- Always use full class qualifiers in the Eval() segment of your UDF
- Don't forget to add the drill-module.conf to the resources folder of
your project (should end up in th root of the jar)
- Adding your udf package to drill-override.conf does not seem to matter
- just copy the jar(s) with the .class and .java files to the
jars/3rdparty directory
- Feel free to user this code anyway you wish:
- https://github.com/acmeguy/asdrill
- Know about this project:
- https://github.com/mapr-demos/simple-drill-functions
> UDF documentation doesn't get people where they need to be
> ----------------------------------------------------------
>
> Key: DRILL-3516
> URL: https://issues.apache.org/jira/browse/DRILL-3516
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Ted Dunning
>
> The UDF documentation on the web side rooted at
> http://drill.apache.org/docs/develop-custom-functions/ does not describe the
> high level process for how UDF's are used, nor does it describe why simple
> things like toString can't work on *Holder data structures.
> This leads to huge confusion and frustration on the part of potentially
> contributors.
> Here are some pertinent threads:
> http://mail-archives.apache.org/mod_mbox/drill-user/201507.mbox/%3CCACAwhF%3DBxs-bXNdrm0pNJ4e8hZiaueqtZMhJ%3DRiBpf%3Dt%3DzEOWA%40mail.gmail.com%3E
> http://mail-archives.apache.org/mod_mbox/drill-user/201507.mbox/%3CCACAwhFmwWkP6udc05UEGFTzpEsaRvAxSRKW%2B2Mg-ijYX8QoQxQ%40mail.gmail.com%3E
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