cloud-fan commented on code in PR #43867:
URL: https://github.com/apache/spark/pull/43867#discussion_r1403999630
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
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@@ -2493,6 +2493,9 @@ class Analyzer(override val catalogManager:
CatalogManager) extends RuleExecutor
* Note: CTEs are handled in CTESubstitution.
*/
object ResolveSubquery extends Rule[LogicalPlan] {
+ // This tag is used to mark resolved subquery to avoid resolving it
repeatedly.
Review Comment:
Can we add more comments? It's used instead of `plan.resolved` because the
post-hoc resolution rules should be run even if the plan is already resolved.
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