AveryQi115 commented on code in PR #50822:
URL: https://github.com/apache/spark/pull/50822#discussion_r2078787459
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala:
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@@ -75,18 +76,35 @@ abstract class PlanExpression[T <: QueryPlan[_]] extends
Expression {
*/
abstract class SubqueryExpression(
plan: LogicalPlan,
- outerAttrs: Seq[Expression],
+ outerAttrs: Seq[(Expression, Boolean)],
Review Comment:
The decorrelation framework needs to distinguish between normal outerAttrs
and outerScopeAttrs because we have some extra operations for outerScopeAttrs.
For this case, both attr2 and att1 should be OuterReference as attr2 can't
be resolved in the SubqueryExpression.plan.
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