Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18956#discussion_r133360995 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -37,6 +37,12 @@ import org.apache.spark.sql.types._ abstract class Optimizer(sessionCatalog: SessionCatalog) extends RuleExecutor[LogicalPlan] { + // 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. + override protected def planChecker: Option[LogicalPlan => Boolean] = Some( --- End diff -- Thanks. I will update it.
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