Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r48737999
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -333,6 +333,39 @@ object ProjectCollapsing extends Rule[LogicalPlan] {
)
Project(cleanedProjection, child)
}
+
+ // TODO Eliminate duplicate code
+ // This clause is identical to the one above except that the inner
operator is an `Aggregate`
+ // rather than a `Project`.
+ case p @ Project(projectList1, agg @ Aggregate(_, projectList2,
child)) =>
--- End diff --
Will it increase the aggregation buffer? cc @yhuai
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