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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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Zheng Shao updated HIVE-894:
----------------------------
Attachment: HIVE-894.3.patch
Make UDAFExampleMaxN and UDAFExampleMinN share the same base class, and also
corrected some problem in the framework preventing us using inherited classes
for UDAF.
Also fixed most of the checkstyle errors.
> 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
> Affects Versions: 0.6.0
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: HIVE-894.1.patch, HIVE-894.1.patch, HIVE-894.2.patch,
> HIVE-894.3.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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