Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2155#discussion_r16801212
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala ---
@@ -43,10 +43,10 @@ package object debug {
implicit class DebugQuery(query: SchemaRDD) {
def debug(): Unit = {
val plan = query.queryExecution.executedPlan
- val visited = new collection.mutable.HashSet[Long]()
+ val visited = new collection.mutable.HashSet[SparkPlan]()
val debugPlan = plan transform {
- case s: SparkPlan if !visited.contains(s.id) =>
- visited += s.id
+ case s: SparkPlan if !visited.contains(s) =>
--- End diff --
Here is an example problem: If we have a tree with a join where the two
sides of the join are structurally identical then we are never going to
traverse one of the sides.
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