viirya commented on a change in pull request #27056: [SPARK-27217][SQL] Nested
schema pruning with Aggregation
URL: https://github.com/apache/spark/pull/27056#discussion_r362932379
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -586,8 +586,7 @@ object ColumnPruning extends Rule[LogicalPlan] {
d.copy(child = prunedChild(child, d.references))
// Prunes the unused columns from child of
Aggregate/Expand/Generate/ScriptTransformation
- case a @ Aggregate(_, _, child) if !child.outputSet.subsetOf(a.references)
=>
- a.copy(child = prunedChild(child, a.references))
Review comment:
Why remove that? This is for top-level column pruning.
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