cloud-fan commented on code in PR #49955:
URL: https://github.com/apache/spark/pull/49955#discussion_r1959744172
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1031,6 +1040,9 @@ object ColumnPruning extends Rule[LogicalPlan] {
} else {
p
}
+ // TODO: Pruning `UnionLoop`s needs to take into account both the outer
`Project` and the inner
+ // `UnionLoopRef` nodes.
Review Comment:
This might hurt performance a lot. Let's figure it out
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