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https://issues.apache.org/jira/browse/HIVE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157034#comment-14157034
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Jason Dere commented on HIVE-2573:
----------------------------------

Agreed that it makes sense to get rid of the native/non-permanent functions.
I could see a case for the permanent (metastore) UDFs being added to the 
session function registry, just because it would keep the system registry clean 
with just built-in functions. Also even if the permanent UDF is in the system 
registry, Session's classloader may not have loaded the Jars necessary for the 
UDF, if it was a different thread which added the UDF to the system registry.  
Although I guess HIVE-6672 should take care of that issue. Anyway it looks like 
the permanent UDFs will work ok either as native/permanent or session/permanent 
so either way should do.

> Create per-session function registry 
> -------------------------------------
>
>                 Key: HIVE-2573
>                 URL: https://issues.apache.org/jira/browse/HIVE-2573
>             Project: Hive
>          Issue Type: Improvement
>          Components: Server Infrastructure
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2573.D3231.1.patch, 
> HIVE-2573.1.patch.txt, HIVE-2573.2.patch.txt, HIVE-2573.3.patch.txt, 
> HIVE-2573.4.patch.txt
>
>
> Currently the function registry is shared resource and could be overrided by 
> other users when using HiveServer. If per-session function registry is 
> provided, this situation could be prevented.



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