Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10577#discussion_r48819727
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -595,6 +598,22 @@ object BooleanSimplification extends Rule[LogicalPlan]
with PredicateHelper {
}
/**
+ * Combines all adjacent [[Union]] and [[Unions]] operators into a single
[[Unions]].
+ */
+object CombineUnions extends Rule[LogicalPlan] {
+ private def collectUnionChildren(plan: LogicalPlan): Seq[LogicalPlan] =
plan match {
+ case Union(l, r) => collectUnionChildren(l) ++ collectUnionChildren(r)
--- End diff --
I see. Removing `Union` introduces a lot of work, but almost done. Will
submit a commit tomorrow. Thanks!
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