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From "David Worms (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2843) UDAF to convert an aggregation to a map
Date Wed, 06 Mar 2013 10:04:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594564#comment-13594564
] 

David Worms commented on HIVE-2843:
-----------------------------------

Hi Namit, just a quick follow up, did you had time to look at the [new review|https://reviews.facebook.net/D8865
? I could find some spare time during the week if required.
                
> UDAF to convert an aggregation to a map
> ---------------------------------------
>
>                 Key: HIVE-2843
>                 URL: https://issues.apache.org/jira/browse/HIVE-2843
>             Project: Hive
>          Issue Type: New Feature
>          Components: UDF
>    Affects Versions: 0.9.0, 0.10.0
>            Reporter: David Worms
>            Priority: Minor
>              Labels: features, udf
>         Attachments: HIVE-2843.1.patch.txt, HIVE-2843.D8745.1.patch, hive-2843-dev.git.patch
>
>
> I propose the addition of two new Hive UDAF to help with maps in Apache Hive. The source
code is available on GitHub at https://github.com/wdavidw/hive-udf in two Java classes: "UDAFToMap"
and "UDAFToOrderedMap". The first function convert an aggregation into a map and is internally
using a Java `HashMap`. The second function extends the first one. It convert an aggregation
into an ordered map and is internally using a Java `TreeMap`. They both extends the `AbstractGenericUDAFResolver`
class.
> Also, I have covered the motivations and usages of those UDAF in a blog post at http://adaltas.com/blog/2012/03/06/hive-udaf-map-conversion/
> The full patch is available with tests as well.

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