Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/17428#discussion_r108185240
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -289,6 +289,9 @@ abstract class QueryPlan[PlanType <:
QueryPlan[PlanType]] extends TreeNode[PlanT
case m: Map[_, _] => m
case d: DataType => d // Avoid unpacking Structs
case seq: Traversable[_] => seq.map(recursiveTransform)
+ case ExistenceJoin(exists: Attribute) =>
+ // `exists` must be an Attribute in ExistenceJoin
+ ExistenceJoin(transformExpression(exists).asInstanceOf[Attribute])
--- End diff --
Is there a particular reason we need to cast the return type of
`transformExpression(<instance_of_Attribute>)` to type `Attribute`?
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