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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