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https://issues.apache.org/jira/browse/HIVE-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Huyn updated HIVE-1130:
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Attachment: HIVE-1130.1.patch
Initial release of generic user-defined aggregate function:
ARGMAX (X, Y)
which takes a set of pairs (X,Y) and returns a Y that maximizes X.
X must be of a comparable type. Any pair (NULL,Y) is ignored. If the function
is applied to an empty set, NULL will be returned. If more than one Y value
maximizes X, one of them will be returned arbitrarily.
The current implementation tested out fine with the rebuilt Hive in my working
copy of the SVN tree. However, it fails with ANT TEST and I could not figure
out why.
The code is ready for review. Also, any help to figure out why ANT TEST fails
is appreciated.
> Create argmin and argmax
> ------------------------
>
> Key: HIVE-1130
> URL: https://issues.apache.org/jira/browse/HIVE-1130
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Zheng Shao
> Assignee: Pierre Huyn
> Attachments: HIVE-1130.1.patch
>
>
> With HIVE-1128, users can already do what argmax and argmin does.
> But it will be helpful if we provide these functions explicitly so people
> from maths/stats background can use it more easily.
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