Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/8587#discussion_r43090251
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala
---
@@ -524,6 +525,116 @@ case class Sum(child: Expression) extends
DeclarativeAggregate {
override val evaluateExpression = Cast(currentSum, resultType)
}
+case class Corr(
--- End diff --
* Please add ScalaDoc and document the behavior for `null` and `NaN` values.
* Provide a link to the wikipedia page that contains the update formula.
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