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https://issues.apache.org/jira/browse/HIVE-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834474#action_12834474
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Zheng Shao commented on HIVE-259:
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> Is there any limitation on what can be used on the state object or can we use
> any java Object?
We support primitive classes, HashMap (translated into map<> type in Hive),
ArrayList (array type in Hive), and any simple struct-like classes (struct type
in Hive).
We support arbitrary levels of nesting, but no recursive types.
> Also how is the state serialized between Map and Reduce?
We use SerDe (see SerDe.serialize(...) ) to serialize/deserialize the objects,
as well as translations between objects that have the same "type" (see
ObjectInspector and ObjectInspectorConverters).
> Add PERCENTILE aggregate function
> ---------------------------------
>
> Key: HIVE-259
> URL: https://issues.apache.org/jira/browse/HIVE-259
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Venky Iyer
> Assignee: Jerome Boulon
> Attachments: HIVE-259.1.patch, HIVE-259.patch
>
>
> Compute atleast 25, 50, 75th percentiles
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