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_r367721889
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
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@@ -151,21 +197,101 @@ object RewriteDistinctAggregates extends
Rule[LogicalPlan] {
// We need at least two distinct aggregates for this rule because
aggregation
// strategy can handle a single distinct group.
// This check can produce false-positives, e.g., SUM(DISTINCT a) &
COUNT(DISTINCT a).
- distinctAggs.size > 1
+ distinctAggs.size >= 1
}
def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
case a: Aggregate if mayNeedtoRewrite(a.aggregateExpressions) => rewrite(a)
}
def rewrite(a: Aggregate): Aggregate = {
+ val expandAggregate = expandDistinctAggregateWithFilter(a)
Review comment:
How about `expandDistinctAggregateWithFilter` ->
`mayExtractFiltersInAggregate`
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