morrySnow commented on code in PR #16125:
URL: https://github.com/apache/doris/pull/16125#discussion_r1089623365
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/AggregateStrategies.java:
##########
@@ -416,7 +416,9 @@ private List<PhysicalHashAggregate<Plan>>
twoPhaseAggregateWithCountDistinctMult
.build();
PhysicalHashAggregate<Plan> gatherLocalAgg = new
PhysicalHashAggregate<>(
localAggGroupBy, localOutput,
Optional.of(partitionExpressions),
- new AggregateParam(AggPhase.LOCAL, AggMode.INPUT_TO_BUFFER),
+ new AggregateParam(AggPhase.LOCAL,
+ logicalAgg.getGroupByExpressions().isEmpty() ?
AggMode.INPUT_TO_RESULT
+ : AggMode.INPUT_TO_BUFFER),
Review Comment:
or, it must be three stage?
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