cloud-fan commented on code in PR #49955:
URL: https://github.com/apache/spark/pull/49955#discussion_r1980957725
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1032,6 +1044,42 @@ object ColumnPruning extends Rule[LogicalPlan] {
p
}
+ case p @ Project(_, ul: UnionLoop) =>
+ if (!ul.outputSet.subsetOf(p.references)) {
+ val newAnchorChildProj = prunedChild(ul.anchor, p.references)
+ val neededIndicesListRef = {
Review Comment:
can you briefly describe the logic here? I thought we could follow how Union
is handled
```
val anchor = ul.anchor
val newAnchor = prunedChild(anchor, p.references)
val newOutput = newAnchor.output
val selected = ul.recursion.output.zipWithIndex.filter { case (a, i) =>
newOutput.contains(anchor.output(i))
}.map(_._1)
val newRecursion = Project(selected, ul.recursion)
p.copy(child = ul.withNewChildren(Seq(newAnchor, newRecursion)))
```
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