Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9858#discussion_r46002572
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Exchange.scala ---
@@ -488,6 +488,12 @@ private[sql] case class EnsureRequirements(sqlContext:
SQLContext) extends Rule[
}
def apply(plan: SparkPlan): SparkPlan = plan.transformUp {
+ case operator @ Exchange(partitioning, child, _) =>
+ child.children match {
+ case Exchange(childPartitioning, baseChild, _)::Nil =>
--- End diff --
Hey, so I know that I said to add the logic here, but now I'm realizing its
kind of odd to add it into the plan and then remove it. Why don't we just
never add it? Maybe this logic should go in SparkStrategies?
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