[GitHub] spark pull request: [WIP] Refactor AggregateFunction2 and Algebrai...

[SparkQA <gi...@git.apache.org>]

Github user SparkQA commented on the pull request:

    https://github.com/apache/spark/pull/8973#issuecomment-145314887
  
      [Test build #43221 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/43221/console) for   PR 8973 at commit [`43f211d`](https://github.com/apache/spark/commit/43f211d3b3cfe014f9774f47791b282e8dc53e09).
     * This patch **fails Scala style tests**.
     * This patch merges cleanly.
     * This patch adds the following public classes _(experimental)_:
      * `case class Average(child: Expression) extends ExpressionAggregateFunction `
      * `case class Count(child: Expression) extends ExpressionAggregateFunction `
      * `case class First(child: Expression) extends ExpressionAggregateFunction `
      * `case class Last(child: Expression) extends ExpressionAggregateFunction `
      * `case class Max(child: Expression) extends ExpressionAggregateFunction `
      * `case class Min(child: Expression) extends ExpressionAggregateFunction `
      * `abstract class StddevAgg(child: Expression) extends ExpressionAggregateFunction `
      * `case class Sum(child: Expression) extends ExpressionAggregateFunction `
      * `sealed abstract class AggregateFunction2 extends Expression with ImplicitCastInputTypes `
      * `abstract class InterpretedAggregateFunction extends AggregateFunction2 `



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