maropu commented on a change in pull request #27058: [SPARK-30276][SQL] Support
Filter expression allows simultaneous use of DISTINCT
URL: https://github.com/apache/spark/pull/27058#discussion_r369306575
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
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@@ -148,24 +205,102 @@ object RewriteDistinctAggregates extends
Rule[LogicalPlan] {
val distinctAggs = exprs.flatMap { _.collect {
case ae: AggregateExpression if ae.isDistinct => ae
}}
- // We need at least two distinct aggregates for this rule because
aggregation
- // strategy can handle a single distinct group.
+ // We need at least two distinct aggregates or a single distinct aggregate
with a filter for
+ // this rule because aggregation strategy can handle a single distinct
group without a filter.
// This check can produce false-positives, e.g., SUM(DISTINCT a) &
COUNT(DISTINCT a).
- distinctAggs.size > 1
+ distinctAggs.size >= 1 || distinctAggs.exists(_.filter.isDefined)
Review comment:
not `distinctAggs.size >= 1` but `distinctAggs.size > 1`?
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