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