zhengruifeng commented on code in PR #47853:
URL: https://github.com/apache/spark/pull/47853#discussion_r1732001642
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ColumnResolutionHelper.scala:
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@@ -585,7 +585,12 @@ trait ColumnResolutionHelper extends Logging with
DataTypeErrorsBase {
}
(resolved.map(r => (r, currentDepth)), true)
} else {
- resolveDataFrameColumnByPlanId(u, id, isMetadataAccess, p.children,
currentDepth + 1)
+ val children = p match {
+ // treat Union node as the leaf node
+ case _: Union => Seq.empty[LogicalPlan]
Review Comment:
this is specific to connect only.
spark classic won't reach this path
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