wangyum commented on a change in pull request #35214:
URL: https://github.com/apache/spark/pull/35214#discussion_r787589420
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -1322,6 +1322,12 @@ object CombineUnions extends Rule[LogicalPlan] {
case Union(children, byName, allowMissingCol)
if byName == topByName && allowMissingCol == topAllowMissingCol =>
stack.pushAll(children.reverse)
+ case Project(projectList, Distinct(u @ Union(children, byName,
allowMissingCol)))
+ if projectList.forall(_.deterministic) && children.nonEmpty &&
+ flattenDistinct && byName == topByName && allowMissingCol ==
topAllowMissingCol =>
+ val newChildren =
PushProjectionThroughUnion.pushProjectionThroughUnion(projectList, u)
+ .map(CollapseProject(_))
Review comment:
Another attempt combine unions after `ReplaceDistinctWithAggregate`:
https://github.com/apache/spark/pull/35249
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