cloud-fan commented on a change in pull request #33671:
URL: https://github.com/apache/spark/pull/33671#discussion_r687462691
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
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@@ -68,7 +68,7 @@ abstract class PlanExpression[T <: QueryPlan[_]] extends
Expression {
*/
abstract class SubqueryExpression(
plan: LogicalPlan,
- outerAttrs: Seq[Expression],
+ val outerAttrs: Seq[Expression],
Review comment:
nit: this needs to touch all the subclasses, which is a bit messy. How
about we just add a new method in this class?
```
def isCorrelated: Boolean = outerAttrs.nonEmpty
```
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