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https://issues.apache.org/jira/browse/HIVE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150214#comment-13150214
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Carl Steinbach commented on HIVE-2573:
--------------------------------------

bq. I've thought keyword 'TEMPORARY' could mean the 'session' thing but it 
seemed to be not safe.

What issues did you run into? I think the original intent of the 'TEMPORARY' 
keyword was to signal that the function's lifecycle is tied to the session. 
Adding a new SESSION keyword seems to imply that non-SESSION TEMPORARY 
functions should be globally visible, which doesn't seem like a good idea.

If we currently have tests that rely on TEMPORARY functions being visible to 
other sessions, then maybe we should instead support 'CREATE [TEMPORARY] 
FUNCTION ...', mapping 'CREATE FUNCTION ...' to the current behavior, and 
'CREATE TEMPORARY FUNCTION ...' to the new behavior added in this patch.
                
> 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
>            Priority: Minor
>         Attachments: HIVE-2573.1.patch.txt, HIVE-2573.2.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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