Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10174#discussion_r48127360
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/rules/RuleExecutor.scala
---
@@ -59,7 +59,7 @@ abstract class RuleExecutor[TreeType <: TreeNode[_]]
extends Logging {
protected case class Batch(name: String, strategy: Strategy, rules:
Rule[TreeType]*)
/** Defines a sequence of rule batches, to be overridden by the
implementation. */
- protected val batches: Seq[Batch]
+ protected def batches: Seq[Batch]
--- End diff --
we can still use `val` here
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