cloud-fan commented on code in PR #51376:
URL: https://github.com/apache/spark/pull/51376#discussion_r2185327148
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala:
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@@ -620,7 +620,11 @@ case class Union(
}
override lazy val resolved: Boolean = {
- children.length > 1 && !(byName || allowMissingCol) && childrenResolved &&
allChildrenCompatible
+ children.length > 1 &&
+ !(byName || allowMissingCol) &&
+ childrenResolved &&
+ allChildrenCompatible &&
+ duplicateResolved
Review Comment:
This looks fine to me
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