Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/19050#discussion_r135271400
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
---
@@ -98,6 +99,11 @@ object RewritePredicateSubquery extends
Rule[LogicalPlan] with PredicateHelper {
val (newCond, inputPlan) =
rewriteExistentialExpr(Seq(predicate), p)
Project(p.output, Filter(newCond.get, inputPlan))
}
+
+ rewrotePlan transform {
+ case j @ Join(left, right, _, _) if !j.duplicateResolved =>
+ j.copy(right = DedupQueryAttributesInPlans.dedupRight(left,
right))
--- End diff --
Can you explain when this becomes a problem? LeftSemi/LeftAnti joins do
output attributes from the right hand side of the join. Is the condition messed
up?
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