Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4991#discussion_r26550346
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -30,6 +30,28 @@ abstract class LogicalPlan extends
QueryPlan[LogicalPlan] with Logging {
self: Product =>
/**
+ * Duplicate the current logical plan for resolving the self join
+ */
+ def newInstance: this.type = {
+ assert(resolved)
+
+ val newArgs = this.productIterator.map {
+ case x: LogicalPlan => x.newInstance
+ case a => a.asInstanceOf[AnyRef]
+ }.toArray
+
+ val defaultCtor =
getClass.getConstructors.find(_.getParameterTypes.size != 0).head
+ defaultCtor.newInstance(newArgs:
_*).asInstanceOf[this.type].transformExpressionsUp {
--- End diff --
I'd prefer to keep all of the reflection magic in `TreeNode` whenever
possible.
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