EnricoMi commented on code in PR #39754:
URL: https://github.com/apache/spark/pull/39754#discussion_r1452156089
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala:
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@@ -3286,6 +3265,25 @@ class Analyzer(override val catalogManager:
CatalogManager) extends RuleExecutor
}
}
+ /**
+ * Resolves expressions against their scope of attributes.
+ */
+ object ResolveScopedExpression extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan =
plan.resolveExpressions {
+ case se: ScopedExpression if se.resolved => se.child
+ case se @ ScopedExpression(expr, attributes) =>
Review Comment:
> we need to make sure `attributes` is a subset of the children output.
I think this only holds for `AttributeReference`, because
`UnresolvedAttribute` that cannot be resolved against children output will
cause an Analyzer error.
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