GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/5100
[SPARK-6424][SQL] Add an user-defined aggregator in AggregateExpression
Currently, only user-defined generators (UDTF in Hive) are supported in
native SparkSQL.
This enables third-parties to easily implement various operations on
DataFrame.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark AddUserDefinedAggregator
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5100.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #5100
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commit f8a8e2c22f83fd4fb961696d94b2d3f39a671b02
Author: Takeshi YAMAMURO <linguin....@gmail.com>
Date: 2015-03-19T03:47:07Z
Add an user-defined aggregator in AggregateExpression
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