LuciferYang commented on a change in pull request #29711:
URL: https://github.com/apache/spark/pull/29711#discussion_r487617202
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
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@@ -316,7 +323,7 @@ object JoinReorderDP extends PredicateHelper with Logging {
}
/** Map[set of item ids, join plan for these items] */
- type JoinPlanMap = Map[Set[Int], JoinPlan]
+ type JoinPlanMap = mutable.LinkedHashMap[Set[Int], JoinPlan]
Review comment:
So all excepted plan changes are due to the use of `LinkedHashMap`
instead of `Map`
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