cloud-fan commented on code in PR #49518:
URL: https://github.com/apache/spark/pull/49518#discussion_r1927047109
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveWithCTE.scala:
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@@ -183,4 +187,52 @@ object ResolveWithCTE extends Rule[LogicalPlan] {
columnNames.map(UnresolvedSubqueryColumnAliases(_, ref)).getOrElse(ref)
}
}
+
+ /**
+ * Checks if there is any self-reference within subqueries and throws an
error
+ * if that is the case.
+ */
+ private def checkForSelfReferenceInSubquery(cteDef: CTERelationDef): Unit = {
+ cteDef.subqueriesAll.foreach { subquery =>
+ subquery.foreach {
+ case CTERelationRef(cteDef.id, _, _, _, _, true) =>
Review Comment:
let's compare the CTE id
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