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From "Prasad Chakka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-470) Support COALESCE using GenericUDF
Date Thu, 04 Jun 2009 01:36:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716123#action_12716123
] 

Prasad Chakka commented on HIVE-470:
------------------------------------

i don't see a test for all NULL args for COALESCE. MySQL supports that.

> Support COALESCE using GenericUDF
> ---------------------------------
>
>                 Key: HIVE-470
>                 URL: https://issues.apache.org/jira/browse/HIVE-470
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>    Affects Versions: 0.4.0
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: HIVE-470.1.patch
>
>
> See HIVE-164 for details. We should support COALESCE which is defined in SQL-92. This
is kind of a syntax sugar, but it is used very frequently in full outer joins.

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