Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17286#discussion_r106582668
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/CostBasedJoinReorder.scala
---
@@ -185,11 +184,14 @@ object JoinReorderDP extends PredicateHelper {
// Should not join two overlapping item sets.
if
(oneSidePlan.itemIds.intersect(otherSidePlan.itemIds).isEmpty) {
val joinPlan = buildJoin(oneSidePlan, otherSidePlan, conf,
conditions, topOutput)
- // Check if it's the first plan for the item set, or it's a
better plan than
- // the existing one due to lower cost.
- val existingPlan = nextLevel.get(joinPlan.itemIds)
- if (existingPlan.isEmpty ||
joinPlan.cost.lessThan(existingPlan.get.cost)) {
- nextLevel.update(joinPlan.itemIds, joinPlan)
+ if (joinPlan.isDefined) {
--- End diff --
when will this condition be false?
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