Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12306#discussion_r59288093
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -77,3 +77,24 @@ case class ScalarSubquery(
override def toString: String = s"subquery#${exprId.id}"
}
+
+/**
+ * Base interface for correlated subquery expressions.
+ */
+abstract class CorrelatedSubqueryExpression extends SubqueryExpression{
--- End diff --
space after SubqueryExpression
For the classdoc, we should document that this gets replaced in the analyzer
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