Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/19295#discussion_r140638641 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/ExperimentalMethods.scala --- @@ -44,11 +44,14 @@ class ExperimentalMethods private[sql]() { */ @volatile var extraStrategies: Seq[Strategy] = Nil + @volatile var extraPreOptimizations: Seq[Rule[LogicalPlan]] = Nil + @volatile var extraOptimizations: Seq[Rule[LogicalPlan]] = Nil --- End diff -- This is an API change. We can't do it.
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