[jira] Commented: (HIVE-554) Add GenericUDF to create arrays, maps, and structs

["Zheng Shao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762340#action_12762340 ] 

Zheng Shao commented on HIVE-554:
---------------------------------

array and map are simpler - we can work on that first before getting into struct.


> Add GenericUDF to create arrays, maps, and structs
> --------------------------------------------------
>
>                 Key: HIVE-554
>                 URL: https://issues.apache.org/jira/browse/HIVE-554
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Zheng Shao
>
> Here is an example:
> {code}
> SELECT array(1,2,3)[3], map("a":1,"b":2,"c":3)["a"], struct(user_id:3, revenue: sum(rev))
> FROM table
> GROUP BY user_id;
> {code}
> This is relatively easy to do with the GenericUDF framework, and will greatly increase the flexibility of the language.

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