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https://issues.apache.org/jira/browse/HIVE-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899383#comment-13899383
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Jason Dere commented on HIVE-6167:
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So DOT isn't normally allowed as part of an identifier. I think this would
only be possible if the dot was included as part of a quoted name, which seems
like a bit of an unusual case. If this case would need to be supported this
may be better off being done as a separate issue.
> 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
> Attachments: HIVE-6167.1.patch, HIVE-6167.2.patch, HIVE-6167.3.patch,
> HIVE-6167.4.patch
>
>
> 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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