Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/8741#issuecomment-140036476
[Test build #42416 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/42416/console)
for PR 8741 at commit
[`bb562a2`](https://github.com/apache/spark/commit/bb562a269b954639a8f254d79782a2f7d0e209c9).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Stddev(child: Expression) extends StddevAgg(child) `
* `case class StddevPop(child: Expression) extends StddevAgg(child) `
* `case class StddevSamp(child: Expression) extends StddevAgg(child) `
* `abstract class StddevAgg(child: Expression) extends AlgebraicAggregate
`
* `abstract class StddevAgg1(child: Expression) extends UnaryExpression
with PartialAggregate1 `
* `case class Stddev(child: Expression) extends StddevAgg1(child) `
* `case class StddevPop(child: Expression) extends StddevAgg1(child) `
* `case class StddevSamp(child: Expression) extends StddevAgg1(child) `
* `case class ComputePartialStd(child: Expression) extends
UnaryExpression with AggregateExpression1 `
* `case class ComputePartialStdFunction (`
* `case class MergePartialStd(`
* `case class MergePartialStdFunction(`
* `case class StddevFunction(`
* `case class IntersectNode(conf: SQLConf, left: LocalNode, right:
LocalNode)`
* `case class SampleNode(`
* `case class TakeOrderedAndProjectNode(`
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