Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14719#discussion_r77995059
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -683,8 +710,14 @@ class Analyzer(
try {
expr transformUp {
case GetColumnByOrdinal(ordinal, _) => plan.output(ordinal)
- case u @ UnresolvedAttribute(nameParts) =>
- withPosition(u) { plan.resolve(nameParts, resolver).getOrElse(u)
}
+ case u @ UnresolvedAttribute(nameParts, targetPlanIdOpt) =>
+ withPosition(u) {
+ targetPlanIdOpt match {
+ case Some(targetPlanId) =>
+ resolveExpressionFromSpecificLogicalPlan(nameParts, plan,
targetPlanId)
--- End diff --
The resolved attribute must be among the output of children, is it
guaranteed here? `resolveExpressionFromSpecificLogicalPlan` will pick a
sub-tree and its output may not be propagated all the way up.
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