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https://issues.apache.org/jira/browse/HIVE-4019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642078#comment-13642078
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Harish Butani commented on HIVE-4019:
-------------------------------------

- ok, glad you agree about isInternal.
- a minor thing: FunctionRegistry::isTableFunction(String name) should also 
have the tFInfo.isTableFunction() check.

- There is a several documents on Windowing & PTFs; would be nice to extract 
pieces from them and update the wiki.
- For windowing the doc attached on Jira 4197 has useful information on 
behavior. The function list should also be updated with the new ranking and 
navigation functions.
- Will be great if you take this on; happy to support in anyway...
                
> Ability to create and drop temporary partition function
> -------------------------------------------------------
>
>                 Key: HIVE-4019
>                 URL: https://issues.apache.org/jira/browse/HIVE-4019
>             Project: Hive
>          Issue Type: New Feature
>          Components: PTF-Windowing
>            Reporter: Ashutosh Chauhan
>            Assignee: Brock Noland
>         Attachments: HIVE-4019-1.patch, HIVE-4019.2.patch, HIVE-4019-3.patch, 
> HIVE-4019-4.patch, HIVE-4019-5.patch, HIVE-4019-6.patch, hive-4019.q
>
>
> Just like udf/udaf/udtf functions, user should be able to add and drop custom 
> partitioning functions.

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