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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