Arina Ielchiieva created DRILL-5666:
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Summary: Add information about UDF naming collisions 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
Add information about UDF naming collisions 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.
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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