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Posted to dev@hive.apache.org by "David Worms (JIRA)" <ji...@apache.org> on 2013/02/18 11:09:12 UTC
[jira] [Updated] (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:all-tabpanel ]
David Worms updated HIVE-2843:
------------------------------
Description:
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.
was:
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.
> 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
>
>
> 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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