Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21054
**[Test build #89278 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/89278/testReport)**
for PR 21054 at commit
[`90c266e`](https://github.com/apache/spark/commit/90c266e09e276c37126d8428a4d00f4986d240e5).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `abstract class AverageAggregate extends DeclarativeAggregate `
* `case class Average(child: Expression) extends AverageAggregate with
ImplicitCastInputTypes `
* `abstract class PearsonCorrelation(x: Expression, y: Expression)`
* `case class Corr(x: Expression, y: Expression)`
* `abstract class CountAggregate extends DeclarativeAggregate `
* `case class Count(children: Seq[Expression]) extends CountAggregate `
* `trait RegrBase extends AggregateFunction with ImplicitCastInputTypes `
* `case class RegrCount(y: Expression, x: Expression) extends
CountAggregate`
* `case class RegrSXX(y: Expression, x: Expression) extends
CentralMomentAgg(x)`
* `case class RegrSYY(y: Expression, x: Expression) extends
CentralMomentAgg(y)`
* `case class RegrAvgX(y: Expression, x: Expression) extends
AverageAggregate`
* `case class RegrAvgY(y: Expression, x: Expression) extends
AverageAggregate`
* `case class RegrSXY(y: Expression, x: Expression) extends Covariance(y,
x)`
* `case class RegrSlope(y: Expression, x: Expression) extends
PearsonCorrelation(y, x)`
* `case class RegrR2(y: Expression, x: Expression) extends
PearsonCorrelation(y, x)`
* `case class RegrIntercept(y: Expression, x: Expression) extends
PearsonCorrelation(y, x)`
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