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https://issues.apache.org/jira/browse/HIVE-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868508#comment-13868508
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Jason Dere commented on HIVE-6167:
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The current syntax and usage (for temporary functions) will continue to work as
they do now. The new syntax additions and behavior (for "permanent" functions
registered in the metastore) is what would have extra name qualifiers.
> 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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