Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21745#discussion_r201716700 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala --- @@ -60,7 +60,8 @@ abstract class LogicalPlan * [[org.apache.spark.sql.catalyst.analysis.UnresolvedRelation UnresolvedRelation]] * should return `false`). */ - lazy val resolved: Boolean = expressions.forall(_.resolved) && childrenResolved + lazy val resolved: Boolean = expressions.forall(_.resolved) && childrenResolved && + missingInput.isEmpty --- End diff -- `missingInput` is special, mostly we can't resolve it. I think that's why we didn't consider it in the `resolved` at the first place. We can update the if condition in `ResolveMissingReferences` to take `missingInput` into consideration.
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