cloud-fan commented on code in PR #48664:
URL: https://github.com/apache/spark/pull/48664#discussion_r1837471917
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sql/api/src/main/scala/org/apache/spark/sql/Column.scala:
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@@ -1382,6 +1382,21 @@ class Column(val node: ColumnNode) extends Logging {
*/
def over(): Column = over(Window.spec)
+ /**
+ * Marks this column reference as an outer reference for subqueries.
+ *
+ * @group subquery
+ * @since 4.0.0
+ */
+ def outer(): Column = withOrigin {
+ node match {
+ case attr: UnresolvedAttribute if !attr.isMetadataColumn =>
+ Column(LazyOuterReference(attr.nameParts, attr.planId))
+ case _ =>
+ throw new IllegalArgumentException(
Review Comment:
we should throw an internal error.
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