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Posted to dev@hive.apache.org by "Philip Tromans (JIRA)" <ji...@apache.org> on 2012/07/18 16:56:34 UTC
[jira] [Commented] (HIVE-2843) UDAF to convert an aggregation to a
map
[ https://issues.apache.org/jira/browse/HIVE-2843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417144#comment-13417144 ]
Philip Tromans commented on HIVE-2843:
--------------------------------------
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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