englefly commented on code in PR #65024:
URL: https://github.com/apache/doris/pull/65024#discussion_r3504281974
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/glue/translator/PhysicalPlanTranslator.java:
##########
@@ -3068,9 +2988,125 @@ private PlanFragment connectJoinNode(HashJoinNode
hashJoinNode, PlanFragment lef
return leftFragment;
}
+ /**
+ * Check whether the one-phase GLOBAL hash aggregate can be fused with its
+ * distribute child into a BucketedAggregationNode. This eliminates
exchange
+ * overhead on single-BE deployments by using in-memory per-bucket merging.
+ */
+ private boolean shouldUseBucketedFusion(PhysicalHashAggregate<? extends
Plan> aggregate) {
+ // Shared eligibility: session var, single-BE, GROUP BY, smooth upgrade
+ if
(!AggregateUtils.isBucketedHashAggEnabled(aggregate.getGroupByExpressions().size()))
{
+ return false;
+ }
+ // Must be one-phase: GLOBAL + INPUT_TO_RESULT
+ if (aggregate.getAggPhase() != AggPhase.GLOBAL
+ || aggregate.getAggMode() != AggMode.INPUT_TO_RESULT) {
+ return false;
+ }
+ // Child must be PhysicalDistribute with hash distribution matching
group keys
+ Plan child = aggregate.child(0);
+ if (!(child instanceof PhysicalDistribute)) {
+ return false;
+ }
+ DistributionSpec distSpec = ((PhysicalDistribute<?>)
child).getDistributionSpec();
+ if (!(distSpec instanceof DistributionSpecHash)) {
+ return false;
+ }
+ List<ExprId> distKeys = ((DistributionSpecHash)
distSpec).getOrderedShuffledColumns();
+ List<ExprId> groupByKeys = aggregate.getGroupByExpressions().stream()
+ .filter(SlotReference.class::isInstance)
+ .map(SlotReference.class::cast)
+ .map(SlotReference::getExprId)
+ .collect(Collectors.toList());
+ return distKeys.equals(groupByKeys);
+ }
+
+ /**
+ * Fuse a one-phase GLOBAL hash aggregate and its PhysicalDistribute child
+ * into a BucketedAggregationNode, skipping the exchange node entirely.
+ * Visits the distribute's child directly to keep everything in one
fragment.
+ */
+ private PlanFragment visitBucketedFusion(
Review Comment:
review6
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