Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/23057#discussion_r235237635
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
---
@@ -70,6 +67,26 @@ object RewritePredicateSubquery extends
Rule[LogicalPlan] with PredicateHelper {
case _ => joinPlan
}
+ private def rewriteDedupPlan(plan: LogicalPlan, rewrites:
AttributeMap[Alias]): LogicalPlan = {
+ val aliasedExpressions = plan.output.map { ref =>
+ rewrites.getOrElse(ref, ref)
+ }
+ Project(aliasedExpressions, plan)
+ }
+
+ private def dedupSubqueryOnSelfJoin(values: Seq[Expression], sub:
LogicalPlan): LogicalPlan = {
--- End diff --
Add a simple code comment for this method?
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