Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22957#discussion_r237745005
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/PlannerSuite.scala ---
@@ -780,6 +780,23 @@ class PlannerSuite extends SharedSQLContext {
classOf[PartitioningCollection])
}
}
+
+ test("SPARK-25951: avoid redundant shuffle on rename") {
--- End diff --
can we have an end-to-end test as well?
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