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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6167) Allow user-defined functions to be qualified with database name
Date Fri, 10 Jan 2014 19:09:53 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868145#comment-13868145
] 

Alan Gates commented on HIVE-6167:
----------------------------------

My thoughts:
# I agree that built-in UDFs should be in a global space that need not (probably cannot) be
qualified.  Everyone needs access to them, and I can't see any value in adding a namespace
here.
# Permanent functions added by users or admins should be in a database.  This gives us namespace
separation, it fits with the SQL standard, and I think it will fit in better with where we're
trying to take the security model.  I'm fine with {{create function}} defaulting to the current
(not necessarily the default) data base if users don't specify which database.
# Temporary functions are really session specific (they go away once the user disconnects)
and can't be accessed by any other session, correct?  So I think it's fine to view them as
"global" for the purposes of that session.  The following sequence should work:
## {{use db foo}}
## {{create temporary function a();}}
## {{use db bar}}
## {{select a( x ) from T}}

> Allow user-defined functions to be qualified with database name
> ---------------------------------------------------------------
>
>                 Key: HIVE-6167
>                 URL: https://issues.apache.org/jira/browse/HIVE-6167
>             Project: Hive
>          Issue Type: Sub-task
>          Components: UDF
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>
> Function names in Hive are currently unqualified and there is a single namespace for
all function names. This task would allow users to define temporary UDFs (and eventually permanent
UDFs) with a database name, such as:
> CREATE TEMPORARY FUNCTION userdb.myfunc 'myudfclass';



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