peter-toth commented on code in PR #38461:
URL: https://github.com/apache/spark/pull/38461#discussion_r1010548429
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/MergeScalarSubqueries.scala:
##########
@@ -346,25 +346,19 @@ 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))
- newPlanSupportsHashAggregate && cachedPlanSupportsHashAggregate ||
- newPlanSupportsHashAggregate == cachedPlanSupportsHashAggregate && {
- val newPlanSupportsObjectHashAggregate =
- Aggregate.supportsObjectHashAggregate(newPlanAggregateExpressions)
- val cachedPlanSupportsObjectHashAggregate =
- Aggregate.supportsObjectHashAggregate(cachedPlanAggregateExpressions)
- newPlanSupportsObjectHashAggregate &&
cachedPlanSupportsObjectHashAggregate ||
- newPlanSupportsObjectHashAggregate ==
cachedPlanSupportsObjectHashAggregate
- }
+ val aggregateExprSeq =
+ Seq(newPlan, cachedPlan).map(plan =>
plan.aggregateExpressions.flatMap(_.collect {
+ case a: AggregateExpression => a
+ }))
+ val supportsHashAggregates = aggregateExprSeq.map(aggregateExpressions =>
Review Comment:
Thanks @beliefer for the PR. I'm ok with the changes. Only a nit that you
could probably use `val Seq(newPlanSupportsHashAggregates,
cachedPlanSupportsHashAggregates) = ...` syntax here to avoid using `.head` and
`.last`.
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