cloud-fan commented on code in PR #48820:
URL: https://github.com/apache/spark/pull/48820#discussion_r1860542552
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sql/api/src/main/scala/org/apache/spark/sql/Column.scala:
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@@ -1383,20 +1383,27 @@ class Column(val node: ColumnNode) extends Logging {
def over(): Column = over(Window.spec)
/**
- * Marks this column reference as an outer reference for subqueries.
+ * Mark this column as an outer column if its expression refers to columns
from an outer query. This
+ * is used to trigger lazy analysis of Spark Classic DataFrame, so that we
can use it to build
+ * subquery expressions. Spark Connect DataFrame is always lazily analyzed
and does not need to
+ * use this function.
Review Comment:
```suggestion
* Mark this column as an outer column if its expression refers to columns
from an outer query.
* This is used to trigger lazy analysis of Spark Classic DataFrame, so
that we can use it to
* build subquery expressions. Spark Connect DataFrame is always lazily
analyzed and does not
* need to use this function.
```
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