cloud-fan commented on code in PR #53681:
URL: https://github.com/apache/spark/pull/53681#discussion_r2662686126
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala:
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@@ -621,12 +621,14 @@ abstract class QueryPlan[PlanType <: QueryPlan[PlanType]]
/**
* A variant of [[foreach]] which considers plan nodes inside subqueries as
well.
+ * The traverse order is subqueries first and then children.
Review Comment:
is it true? `f(plan)` is invoked on itself first, then subqueries, then its
children.
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