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Posted to dev@hive.apache.org by "John Sichi (JIRA)" <ji...@apache.org> on 2010/04/13 23:39:55 UTC

[jira] Updated: (HIVE-1304) add row_sequence UDF

     [ https://issues.apache.org/jira/browse/HIVE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Sichi updated HIVE-1304:
-----------------------------

    Attachment: HIVE-1304.1.patch

> 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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