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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1304) add row_sequence UDF
Date Tue, 13 Apr 2010 21:49:48 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856638#action_12856638
] 

Edward Capriolo commented on HIVE-1304:
---------------------------------------

Can we work on... https://issues.apache.org/jira/browse/HIVE-1265..first.

As of now commits on UDF's is a major pain. Two or three times already I had had to regenerate
UDFs because someone else touched the FunctionRegistry. I have had two or three waves of UDF's
I want to commit ReflectionUDF, MathUDF, EncryptionUDF but something else sneaks in and I
have to regenerate. It is a major pain. 



> add row_sequence UDF
> --------------------
>
>                 Key: HIVE-1304
>                 URL: https://issues.apache.org/jira/browse/HIVE-1304
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Metastore
>    Affects Versions: 0.6.0
>            Reporter: John Sichi
>            Assignee: John Sichi
>             Fix For: 0.6.0
>
>         Attachments: HIVE-1304.1.patch
>
>
> This is a poor man's answer to the standard analytic function row_number(); it assigns
a sequence of numbers to rows, starting from 1.
> I'm calling it row_sequence() to distinguish it from the real analytic function, so that
once we add support for those, there won't be any conflict with the existing UDF.
> The problem with this UDF approach is that there are no guarantees about ordering in
SQL processing internals, so use with caution.

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