cloud-fan commented on code in PR #41763:
URL: https://github.com/apache/spark/pull/41763#discussion_r1345269790
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala:
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@@ -325,6 +326,61 @@ object LogicalPlanIntegrity {
LogicalPlanIntegrity.hasUniqueExprIdsForOutput(plan))
}
+ /**
+ * This method validates there are no dangling attribute references.
+ * Returns an error message if the check does not pass, or None if it does
pass.
+ */
+ def validateNoDanglingReferences(plan: LogicalPlan): Option[String] = {
+ plan.collectFirst {
+ // DML commands and multi instance relations (like InMemoryRelation
caches)
+ // have different output semantics than typical queries.
Review Comment:
Do we really need to special-case these two? `QueryPlan#missingInputs`
should have already taken care of them
```
final def missingInput: AttributeSet = references -- inputSet
```
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