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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-164) Support CASE and IF statement
Date Thu, 29 Jan 2009 04:29:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668329#action_12668329
] 

Ashish Thusoo commented on HIVE-164:
------------------------------------

+1 to the new patch.

We should however support complex types. We don't do so mostly because we do not yet have
UDFs that have a well defined behavior for complex types. IF clearly has. Can you file a JIRA
for that. We can get this in but the other JIRA should go in as a bug fix...

Ashish

PS: Am running tests on this and will commit once they succeed.

> Support CASE and IF statement
> -----------------------------
>
>                 Key: HIVE-164
>                 URL: https://issues.apache.org/jira/browse/HIVE-164
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: HIVE-164.1.patch, HIVE-164.2.patch
>
>
> See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html for details.
> Syntax:
> {code}
> CASE value WHEN [compare_value] THEN result [WHEN [compare_value] THEN result ...] [<ELSE
result] END
> CASE WHEN [condition] THEN result [WHEN [condition] THEN result ...] [ELSE result] END

> IF(expr1,expr2,expr3)
> {code}

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