Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/17286#discussion_r106603543
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/JoinReorderSuite.scala
---
@@ -187,6 +220,8 @@ class JoinReorderSuite extends PlanTest with
StatsEstimationTestBase {
case (j1: Join, j2: Join) =>
(sameJoinPlan(j1.left, j2.left) && sameJoinPlan(j1.right,
j2.right)) ||
(sameJoinPlan(j1.left, j2.right) && sameJoinPlan(j1.right,
j2.left))
+ case _ if plan1.children.nonEmpty && plan2.children.nonEmpty =>
--- End diff --
If they are two projects, we should recurse into it's child. And we may
have some tests with other operators in the future, so I didn't only match
project here.
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