cloud-fan commented on a change in pull request #29291:
URL: https://github.com/apache/spark/pull/29291#discussion_r463395762



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteDistinctAggregates.scala
##########
@@ -207,13 +257,30 @@ object RewriteDistinctAggregates extends 
Rule[LogicalPlan] {
       val distinctAggChildren = distinctAggGroups.keySet.flatten.toSeq.distinct
       val distinctAggChildAttrMap = 
distinctAggChildren.map(expressionAttributePair)
       val distinctAggChildAttrs = distinctAggChildAttrMap.map(_._2)
+      // Setup all the filters in distinct aggregate.
+      val distinctAggExprs = aggExpressions
+        .filter(e => e.isDistinct && e.children.exists(!_.foldable))

Review comment:
       how about `count(distinct 1) FILTER (WHERE ...)`




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