Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/10630#discussion_r49239389
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -116,7 +116,18 @@ case class Union(left: LogicalPlan, right:
LogicalPlan) extends SetOperation(lef
}
}
-case class Intersect(left: LogicalPlan, right: LogicalPlan) extends
SetOperation(left, right)
+case class Intersect(left: LogicalPlan, right: LogicalPlan) extends
SetOperation(left, right) {
+ def duplicateResolved: Boolean =
left.outputSet.intersect(right.outputSet).isEmpty
+
+ // Intersect is only resolved if they don't introduce ambiguous
expression ids,
+ // since it will be converted to semi Join by optimizer.
--- End diff --
Will update the comments in the code.
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