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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-259) Add PERCENTILE aggregate function
Date Tue, 16 Feb 2010 21:19:30 GMT

    [ https://issues.apache.org/jira/browse/HIVE-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834474#action_12834474
] 

Zheng Shao commented on HIVE-259:
---------------------------------

> 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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