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From "Bill Jia (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-894) add udaf max_n, min_n to contrib
Date Fri, 01 Jan 2010 00:20:29 GMT

     [ https://issues.apache.org/jira/browse/HIVE-894?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bill Jia updated HIVE-894:
--------------------------

    Attachment: HIVE-894.1.patch

(1) Standard apache header added in the new files
(2) Codes shared. Added a new file/class - SortedArrayUtils.java, with two static functions
- static void binaryInsert(ArrayList<Double> array, Double value, boolean ascending)
and static ArrayList<Double> sortedMerge(ArrayList<Double> a1, ArrayList<Double>
a2, boolean ascending, int N). 
(3) Skipped "describe max_n; describe extended max_n" since the tests failed. 

> add udaf max_n, min_n to contrib
> --------------------------------
>
>                 Key: HIVE-894
>                 URL: https://issues.apache.org/jira/browse/HIVE-894
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Zheng Shao
>            Assignee: Bill Jia
>         Attachments: HIVE-894.1.patch, HIVE-894.1.patch
>
>
> These 2 UDAFs should return the max n numbers, min n numbers in order.
> {code}
> SELECT max_n(userid, 3) FROM src;
> [999,997,996]
> SELECT max_n(userid, 3)[1] FROM src;
> 997
> SELECT min_n(userid, 3) FROM src;
> [0, 3, 8]
> SELECT min_n(userid, 3)[2] FROM src;
> 8
> {code}

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