Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12720#discussion_r61383358
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -337,6 +337,16 @@ case class PrettyAttribute(
override def nullable: Boolean = true
}
+/**
+ * A place holder used to hold a reference that has been resolved to a
field outside of the current
+ * plan. This is used for correlated subqueries.
+ */
+case class OuterReference(e: NamedExpression) extends LeafExpression with
Unevaluable {
+ override def dataType: DataType = e.dataType
+ override def nullable: Boolean = e.nullable
+ override def prettyName: String = "outer"
--- End diff --
I see, thanks
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