LuciferYang commented on a change in pull request #29434:
URL: https://github.com/apache/spark/pull/29434#discussion_r471064312
##########
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:
Maybe we can add a Manual sort like
```
while (k <= lev - k) {
val oneSideCandidates =
existingLevels(k).values.toSeq.sortBy(_.itemIds.head)
for (i <- oneSideCandidates.indices) {
val oneSidePlan = oneSideCandidates(i)
val otherSideCandidates = if (k == lev - k) {
// Both sides of a join are at the same level, no need to repeat
for previous ones.
oneSideCandidates.drop(i)
} else {
existingLevels(lev - k).values.toSeq.sortBy(_.itemIds.head)
}
..
```
to ensure the candidates plan input order, but the results tend to be expect
plan in Scala 2.13
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