Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/2998#issuecomment-61597430
[Test build #22861 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/22861/consoleFull)
for PR 2998 at commit
[`addfbd9`](https://github.com/apache/spark/commit/addfbd97667ca3da712a32325928c23b8827a307).
* This patch **passes all tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `trait StringTransformationExpression `
* `trait StringCalculationExpression `
* `case class Ltrim(child: Expression) extends UnaryExpression with
StringTransformationExpression `
* `case class Rtrim(child: Expression) extends UnaryExpression with
StringTransformationExpression `
* `case class Length(child: Expression) extends UnaryExpression with
StringCalculationExpression `
* `case class Trim(child: Expression) extends UnaryExpression with
StringTransformationExpression `
* `case class Upper(child: Expression) extends UnaryExpression with
StringTransformationExpression `
* `case class Lower(child: Expression) extends UnaryExpression with
StringTransformationExpression `
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