milanisvet commented on code in PR #49518:
URL: https://github.com/apache/spark/pull/49518#discussion_r1927184001
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CTESubstitution.scala:
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@@ -87,6 +87,11 @@ object CTESubstitution extends Rule[LogicalPlan] {
case LegacyBehaviorPolicy.CORRECTED =>
traverseAndSubstituteCTE(plan, forceInline, Seq.empty, cteDefs)
}
+ // Recursive CTEs allow only one self-reference per CTE. Here, we perform
this check and
+ // throw an error if it is not fulfilled
+ cteDefs.foreach { cteDef =>
+ checkNumberOfSelfReferences(cteDef)
Review Comment:
Done
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