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 :)



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