beliefer commented on a change in pull request #26656: [SPARK-27986][SQL]
Support ANSI SQL filter clause for aggregate expression
URL: https://github.com/apache/spark/pull/26656#discussion_r360752300
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
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@@ -194,7 +238,10 @@ object RewriteDistinctAggregates extends
Rule[LogicalPlan] {
val regularAggOperatorMap = regularAggExprs.map { e =>
// Perform the actual aggregation in the initial aggregate.
val af =
patchAggregateFunctionChildren(e.aggregateFunction)(regularAggChildAttrLookup.get)
- val operator = Alias(e.copy(aggregateFunction = af), e.sql)()
+ val filterOpt = e.filter.map(_.transform {
Review comment:
OK. There need the comments indeed.
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