milanisvet commented on code in PR #49518: URL: https://github.com/apache/spark/pull/49518#discussion_r1925274874
########## sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CTESubstitution.scala: ########## @@ -423,4 +429,20 @@ object CTESubstitution extends Rule[LogicalPlan] { case _ => WithCTE(p, cteDefs) } } + + /** + * Counts number of self-references in a recursive CTE definition and throws an error + * if that number is bigger than 1. + */ + private def checkNumberOfSelfReferences(cteDef: CTERelationDef): Unit = { + val numOfSelfRef = cteDef.map[Boolean] { + case CTERelationRef(cteDef.id, _, _, _, _, true) => true + case other => false + }.count(_ == true) Review Comment: Rewritten, thanks :) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org