HyukjinKwon commented on code in PR #36477:
URL: https://github.com/apache/spark/pull/36477#discussion_r867603924
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -855,6 +855,15 @@ object ColumnPruning extends Rule[LogicalPlan] {
case e @ Expand(_, _, child) if !child.outputSet.subsetOf(e.references) =>
e.copy(child = prunedChild(child, e.references))
+ // Prunes the duplicate columns from child of UnaryNode, e.g.: Aggregate
Review Comment:
Hm, I think this doesn't work for now. Spark currently allows duplicated
column names in some Dataset API cases too.
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