Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r100190232
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/ExperimentalMethods.scala ---
@@ -46,4 +48,23 @@ class ExperimentalMethods private[sql]() {
@volatile var extraOptimizations: Seq[Rule[LogicalPlan]] = Nil
+ /**
+ * Get an identical copy of this `ExperimentalMethods` instance.
+ * @note This is used when forking a `SparkSession`.
+ * `clone` is provided here instead of implementing equivalent
functionality
+ * in `SparkSession.clone` since it needs to be updated
+ * as the class `ExperimentalMethods` is extended or modified.
+ */
+ override def clone: ExperimentalMethods = {
+ def cloneSeq[T](seq: Seq[T]): Seq[T] = {
+ val newSeq = new ListBuffer[T]
+ newSeq ++= seq
+ newSeq
+ }
+
+ val result = new ExperimentalMethods
+ result.extraStrategies = cloneSeq(extraStrategies)
--- End diff --
You don't need to copy these two `Seq`s since they are not mutable `Seq`s.
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