Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8587#discussion_r43435127
--- 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 --
This is just a place holder, right? Can we change it to `with
AggregateExpression1` then we throw an exception (UnsupportedOperatorException)
in the `newInstance` method?
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