ueshin commented on code in PR #48664:
URL: https://github.com/apache/spark/pull/48664#discussion_r1817452154
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sql/api/src/main/scala/org/apache/spark/sql/Column.scala:
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@@ -1382,6 +1382,17 @@ class Column(val node: ColumnNode) extends Logging {
*/
def over(): Column = over(Window.spec)
+ /**
+ * TODO: Add documentation
+ * @return
+ */
+ def outer(): Column = withOrigin {
+ node match {
+ case attr: UnresolvedAttribute if !attr.isMetadataColumn =>
+ Column(LazyOuterReference(attr.nameParts, attr.planId))
+ // TODO: other cases
Review Comment:
Is it ok to use metadata columns as outer?
Do we have other cases we can support `outer()`?
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