Github user SparkQA commented on the pull request:
https://github.com/apache/spark/pull/2998#issuecomment-61230476
[Test build #22606 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/22606/consoleFull)
for PR 2998 at commit
[`b7790f4`](https://github.com/apache/spark/commit/b7790f4c8d700d8b59b06aea80b249421c207e2c).
* 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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