LuciferYang commented on a change in pull request #29434:
URL: https://github.com/apache/spark/pull/29434#discussion_r471061359
##########
File path:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/StarJoinCostBasedReorderSuite.scala
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@@ -351,6 +351,18 @@ class StarJoinCostBasedReorderSuite extends PlanTest with
StatsEstimationTestBas
.join(t5.join(t6, Inner, Some(nameToAttr("t5_c2") ===
nameToAttr("t6_c2"))), Inner,
Some(nameToAttr("d2_c2") === nameToAttr("t5_c1")))
.select(outputsOf(d1, t3, t4, f1, d2, t5, t6, d3, t1, t2): _*)
+ } else {
Review comment:
I think the difference is caused by the 'toMap' method, the code
affected for this case includes:
https://github.com/apache/spark/blob/c280c7f529e2766dd7dd45270bde340c28b9d74b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala#L153-L155
https://github.com/apache/spark/blob/c280c7f529e2766dd7dd45270bde340c28b9d74b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala#L163-L166
https://github.com/apache/spark/blob/c280c7f529e2766dd7dd45270bde340c28b9d74b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala#L208-L236
The Iteration order of `existingLevels(k).values.toSeq` and
`existingLevels(lev - k).values.toSeq` in Scala 2.13 different from in Scala
2.12
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