Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/8587#discussion_r43452255
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala
---
@@ -747,6 +747,19 @@ case class LastFunction(
}
}
+/**
+ * Calculate Pearson Correlation Coefficient for the given columns.
+ * Only support AggregateExpression2.
+ *
+ */
+case class Corr(left: Expression, right: Expression)
+ extends BinaryExpression with AggregateExpression with
ImplicitCastInputTypes {
--- End diff --
But how do we check spark.sql.useAggregate2=false at this expression?
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