peter-toth commented on a change in pull request #33671:
URL: https://github.com/apache/spark/pull/33671#discussion_r690408962



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File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CTESubstitution.scala
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@@ -130,23 +169,36 @@ object CTESubstitution extends Rule[LogicalPlan] {
    * @param plan the plan to be traversed
    * @return the plan where CTE substitution is applied

Review comment:
       As the return value of `traverseAndSubstituteCTE` changed a bit, this 
docs could use some update.




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