viirya commented on a change in pull request #23658: [SPARK-26735][SQL] Verify 
plan integrity for special expressions
URL: https://github.com/apache/spark/pull/23658#discussion_r251192442
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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 @@ -41,7 +41,39 @@ abstract class Optimizer(sessionCatalog: SessionCatalog)
   // Check for structural integrity of the plan in test mode. Currently we 
only check if a plan is
   // still resolved after the execution of each rule.
 
 Review comment:
   We have another check now. We should update the doc here.

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