cloud-fan commented on code in PR #49571:
URL: https://github.com/apache/spark/pull/49571#discussion_r1924863992
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1031,6 +1038,9 @@ 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:
seems OK to just place a `Project` above `UnionLoopRef` to do column pruning?
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