Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/1106#issuecomment-55099544
[QA tests have
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/20101/consoleFull)
for PR 1106 at commit
[`d1a928b`](https://github.com/apache/spark/commit/d1a928b3afaa32ded9dd2e087da4b1229028fdba).
* This patch **passes** unit tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Last(child: Expression) extends PartialAggregate with
trees.UnaryNode[Expression] `
* `case class LastFunction(expr: Expression, base: AggregateExpression)
extends AggregateFunction `
* `case class Abs(child: Expression) extends UnaryExpression `
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