Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20345#discussion_r175971428
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/JoinOptimizationSuite.scala
---
@@ -145,4 +159,15 @@ class JoinOptimizationSuite extends PlanTest {
}
assert(broadcastChildren.size == 1)
}
+
+ test("SPARK-23172 skip projections when flattening joins") {
--- End diff --
ok
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