mgaido91 commented on a change in pull request #23057: [SPARK-26078][SQL] Dedup
self-join attributes on IN subqueries
URL: https://github.com/apache/spark/pull/23057#discussion_r241322725
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -54,10 +54,7 @@ object RewritePredicateSubquery extends Rule[LogicalPlan]
with PredicateHelper {
val aliasMap = AttributeMap(duplicates.map { dup =>
dup -> Alias(dup, dup.toString)()
}.toSeq)
- val aliasedExpressions = right.output.map { ref =>
- aliasMap.getOrElse(ref, ref)
- }
- val newRight = Project(aliasedExpressions, right)
+ val newRight = rewriteDedupPlan(right, aliasMap)
val newJoinCond = joinCond.map { condExpr =>
Review comment:
yes, I actually think this is useless. Let me try and remove it.
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