Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/12612#issuecomment-214427960
**[Test build #56900 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/56900/consoleFull)**
for PR 12612 at commit
[`470ec7b`](https://github.com/apache/spark/commit/470ec7b2df873bfb8982cd72a7d42092440f8b0a).
* This patch **fails to build**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `abstract class NewAccumulator[IN, OUT] extends Serializable `
* `case class UpdatedLongValue(l: Long) extends UpdatedValue `
* `class LongAccumulator extends NewAccumulator[jl.Long, jl.Long] `
* `case class UpdatedDoubleValue(d: Double) extends UpdatedValue `
* `class DoubleAccumulator extends NewAccumulator[jl.Double, jl.Double] `
* `case class UpdatedAverageValue(sum: Double, count: Long) extends
UpdatedValue `
* `class AverageAccumulator extends NewAccumulator[jl.Double, jl.Double] `
* `case class GenericUpdatedValue[T](value: T) extends UpdatedValue `
* `class CollectionAccumulator[T] extends NewAccumulator[T,
java.util.List[T]] `
* `class LegacyAccumulatorWrapper[R, T](`
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