[jira] [Updated] (DRILL-5666) Add information about UDF naming collision to Drill documentation

["Arina Ielchiieva (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-5666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arina Ielchiieva updated DRILL-5666:
------------------------------------
    Fix Version/s:     (was: 1.12.0)
                   Future

> Add information about UDF naming collision to Drill documentation
> -----------------------------------------------------------------
>
>                 Key: DRILL-5666
>                 URL: https://issues.apache.org/jira/browse/DRILL-5666
>             Project: Apache Drill
>          Issue Type: Task
>    Affects Versions: 1.10.0
>            Reporter: Arina Ielchiieva
>            Assignee: Bridget Bevens
>            Priority: Minor
>              Labels: doc-impacting
>             Fix For: Future
>
>
> Add information about UDF naming collision to Drill documentation.
> The below information can be used as model:
> Under duplicated UDF we imply UDF with the same signature (name + input parameters, including input mode, ex: LOWER(VARCHAR-OPTIONAL)).
> If duplicated function is found during drillbit start up, drillbit will fail.
> If we speak about Dynamic UDFs upload then if user tries to register duplicated function, registration will fail and user will see appropriate error message.
> This error message will include duplicated function signature and from where it was registered (built-in or jar name if dynamic).
> Functions can be built-in or dynamic. When function is built-in, it can be registered from two places, from drill-java-exec jar or from custom jar (if it is placed into the classpath, usually into jars folder).
> If function is built-in and was registered from drill-java-exec jar, you cannot replace it with your own, unless you change drill-java-exec jar (this will mean you'll have your own Drill version).
> If function is built-in and was registered from custom jar in classpath, you can remove / replace custom jar and restart drillbit.
> If function is dynamic, you can use DROP FUNCTION command and then register new function with the same signature. 
> Link to Drill documentation - https://drill.apache.org/docs/develop-custom-functions/



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