Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/2211#issuecomment-53942264
[QA tests have
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/19505/consoleFull)
for PR 2211 at commit
[`42bd626`](https://github.com/apache/spark/commit/42bd6264ab0ea3524b63948995125ad72186ecf5).
* This patch **fails** unit tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Sqrt(child: Expression) extends UnaryExpression `
* ` class TreeNodeRef(val obj: TreeNode[_]) `
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