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https://issues.apache.org/jira/browse/HIVE-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417144#comment-13417144
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Philip Tromans commented on HIVE-2843:
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Hi David,
I think that this would be a really useful addition to Hive. I was just about
to write the same UDAF when I came across yours. I think implode_to_map is a
good name for it, because as you say, implode has quite a few meanings, but I'm
interested in what others have to say.
I don't mind preparing / submitting the patch / test cases if you're working on
other things.
Cheers,
Phil.
> 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
> Reporter: David Worms
> Priority: Minor
> Labels: features, udf
>
> 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/
> If you are interested by my proposal, I'll take the time to update this issue
> while following the guideline posted on the wiki to create an appropriate
> path.
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