Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18956#discussion_r137681045 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/rules/RuleExecutor.scala --- @@ -64,6 +64,14 @@ abstract class RuleExecutor[TreeType <: TreeNode[_]] extends Logging { protected def batches: Seq[Batch] /** + * Defines a check function which checks for structural integrity of the plan after the execution --- End diff -- `which` -> `that`
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