LuciferYang commented on a change in pull request #29434:
URL: https://github.com/apache/spark/pull/29434#discussion_r471899486
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
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@@ -206,14 +206,14 @@ object JoinReorderDP extends PredicateHelper with Logging
{
// For the lower level k, we only need to search from 0 to lev - k,
because when building
// a join from A and B, both A J B and B J A are handled.
while (k <= lev - k) {
- val oneSideCandidates = existingLevels(k).values.toSeq
+ val oneSideCandidates =
existingLevels(k).values.toSeq.sortBy(_.itemIds.head)
Review comment:
need to try, there is no good idea now.
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