cloud-fan commented on a change in pull request #35214:
URL: https://github.com/apache/spark/pull/35214#discussion_r786071848
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -78,7 +78,6 @@ abstract class Optimizer(catalogManager: CatalogManager)
val operatorOptimizationRuleSet =
Seq(
// Operator push down
- PushProjectionThroughUnion,
Review comment:
This looks like a weird fix to me, by moving an optimizer rule from the
main batch to a new batch before `Batch("Union", ...)`.
Can we fix `CombineUnions` instead? To support group-only `Aggregate`.
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