Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19080#discussion_r135970084
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/EnsureRequirements.scala
---
@@ -153,6 +139,14 @@ case class EnsureRequirements(conf: SQLConf) extends
Rule[SparkPlan] {
val requiredChildOrderings: Seq[Seq[SortOrder]] =
operator.requiredChildOrdering
var children: Seq[SparkPlan] = operator.children
assert(requiredChildDistributions.length == children.length)
+
+ val needCoPartitionChildIndex =
requiredChildDistributions.zipWithIndex.filter {
+ case (UnspecifiedDistribution, _) => false
--- End diff --
I don't think so. It's kind of a blacklist mechanism, only 2 special
distribution doesn't need co-location.
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