beliefer commented on code in PR #38461:
URL: https://github.com/apache/spark/pull/38461#discussion_r1011416561
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/MergeScalarSubqueries.scala:
##########
@@ -346,25 +346,20 @@ object MergeScalarSubqueries extends Rule[LogicalPlan] {
// Only allow aggregates of the same implementation because merging
different implementations
// could cause performance regression.
private def supportedAggregateMerge(newPlan: Aggregate, cachedPlan:
Aggregate) = {
- val newPlanAggregateExpressions =
newPlan.aggregateExpressions.flatMap(_.collect {
- case a: AggregateExpression => a
- })
- val cachedPlanAggregateExpressions =
cachedPlan.aggregateExpressions.flatMap(_.collect {
- case a: AggregateExpression => a
- })
- val newPlanSupportsHashAggregate = Aggregate.supportsHashAggregate(
-
newPlanAggregateExpressions.flatMap(_.aggregateFunction.aggBufferAttributes))
- val cachedPlanSupportsHashAggregate = Aggregate.supportsHashAggregate(
-
cachedPlanAggregateExpressions.flatMap(_.aggregateFunction.aggBufferAttributes))
+ val aggregateExpressionsSeq =
+ Seq(newPlan, cachedPlan).map(plan =>
plan.aggregateExpressions.flatMap(_.collect {
+ case a: AggregateExpression => a
+ }))
+ val Seq(newPlanSupportsHashAggregate, cachedPlanSupportsHashAggregate) =
+ aggregateExpressionsSeq.map(aggregateExpressions =>
Aggregate.supportsHashAggregate(
+ aggregateExpressions.flatMap(_.aggregateFunction.aggBufferAttributes)))
+ lazy val Seq(newPlanSupportsObjectHashAggregate,
cachedPlanSupportsObjectHashAggregate) =
+ aggregateExpressionsSeq.map(aggregateExpressions =>
+ Aggregate.supportsObjectHashAggregate(aggregateExpressions))
newPlanSupportsHashAggregate && cachedPlanSupportsHashAggregate ||
- newPlanSupportsHashAggregate == cachedPlanSupportsHashAggregate && {
- val newPlanSupportsObjectHashAggregate =
- Aggregate.supportsObjectHashAggregate(newPlanAggregateExpressions)
- val cachedPlanSupportsObjectHashAggregate =
- Aggregate.supportsObjectHashAggregate(cachedPlanAggregateExpressions)
- newPlanSupportsObjectHashAggregate &&
cachedPlanSupportsObjectHashAggregate ||
- newPlanSupportsObjectHashAggregate ==
cachedPlanSupportsObjectHashAggregate
- }
+ newPlanSupportsHashAggregate == cachedPlanSupportsHashAggregate &&
Review Comment:
I got it.
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