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From "Kristine Hahn (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3518) Do a better job of providing conceptual overview to UDF creation
Date Thu, 20 Aug 2015 13:19:46 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14704859#comment-14704859

Kristine Hahn commented on DRILL-3518:

Doc additions: Added points 1 and 2 to [Developing a Simple Fumction|http://kristinehahn.github.io/drill/docs/developing-a-simple-function/].

Keep the following requirements in mind:
* Annotate all data that a UDF uses.
* Fully qualify class references.
Added points 4 and 5 to [Developing an Aggregate Function|http://kristinehahn.github.io/drill/docs/developing-an-aggregate-function/].
Keep the following guidelines in mind:
* Do not use complex @Workspace variables.
* You cannot allocate a Repeated* value or have a ComplexWriter in the @Workspace.
These additions will appear on Apache site next time we publish.

> Do a better job of providing conceptual overview to UDF creation
> ----------------------------------------------------------------
>                 Key: DRILL-3518
>                 URL: https://issues.apache.org/jira/browse/DRILL-3518
>             Project: Apache Drill
>          Issue Type: Sub-task
>          Components: Documentation
>            Reporter: Jacques Nadeau
> Since UDFs are effectively written in Java, people find it confusing when some Java features
aren't supported.  Let's try to do a better job of outlining the pitfalls.

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