EmmyMiao87 commented on code in PR #10483:
URL: https://github.com/apache/doris/pull/10483#discussion_r909256844
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fe/fe-core/src/main/java/org/apache/doris/nereids/memo/Group.java:
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@@ -184,7 +184,7 @@ public void setExplored(boolean explored) {
* @return {@link Optional} of cost and {@link GroupExpression} of
physical plan pair.
*/
public Optional<Pair<Double, GroupExpression>>
getLowestCostPlan(PhysicalProperties physicalProperties) {
- if (physicalProperties == null || lowestCostPlans.isEmpty()) {
+ if (physicalProperties == null || lowestCostPlans == null ||
lowestCostPlans.isEmpty()) {
Review Comment:
The lowestCostPlans hash been initialed in Line.49. So the lowest cost plans
could not be null.
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