GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/12077
[SPARK-14285][SQL] Implement common type-safe aggregate functions
## What changes were proposed in this pull request?
In the Dataset API, it is fairly difficult for users to perform simple
aggregations in a type-safe way at the moment because there are no aggregators
that have been implemented. This pull request adds a few common aggregate
functions in expressions.scala.typed package.
## How was this patch tested?
Added unit tests for them.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-14285
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12077.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 #12077
----
commit e6d1bcf581d86c9afb1ee4cace9f291945aadaa3
Author: Reynold Xin <[email protected]>
Date: 2016-03-31T01:57:45Z
[SPARK-14285][SQL] Implement common type-safe aggregate functions
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