GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/9499
[SPARK-11528] [SQL] Typed aggregations for Datasets
This PR adds the ability to do typed SQL aggregations. We will likely also
want to provide an interface to allow users to do aggregations on objects, but
this is deferred to another PR.
```scala
val ds = Seq(("a", 10), ("a", 20), ("b", 1), ("b", 2), ("c", 1)).toDS()
ds.groupBy(_._1).agg(sum("_2").as[Int]).collect()
res0: Array(("a", 30), ("b", 3), ("c", 1))
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark dataset-agg
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9499.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 #9499
----
commit 6d40e4294b224f18235c9a9ca44b8ccddcf6b6f6
Author: Michael Armbrust <[email protected]>
Date: 2015-11-05T18:05:14Z
[SPARK-11528] [SQL] Typed aggregations for Datasets
----
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