Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/12612#issuecomment-213463929
**[Test build #56704 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/56704/consoleFull)**
for PR 12612 at commit
[`50ebb24`](https://github.com/apache/spark/commit/50ebb24b8be67eb0dab40b5313a9ad1d01f8129e).
* This patch **fails Scala style tests**.
* This patch **does not merge cleanly**.
* This patch adds the following public classes _(experimental)_:
* `abstract class NewAccumulator[IN, OUT] extends Serializable `
* `class IntAccumulator extends NewAccumulator[jl.Integer, jl.Integer] `
* `class LongAccumulator extends NewAccumulator[jl.Long, jl.Long] `
* `class DoubleAccumulator extends NewAccumulator[jl.Double, jl.Double] `
* `class AverageAccumulator extends NewAccumulator[jl.Double, jl.Double] `
* `class CollectionAccumulator[T] extends NewAccumulator[T,
java.util.List[T]] `
* `class LegacyAccumulatorWrapper[R, T](`
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