maropu commented on a change in pull request #23964: [SPARK-26975][SQL] Support
nested-column pruning over limit/sample/repartition
URL: https://github.com/apache/spark/pull/23964#discussion_r265848830
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -647,6 +647,10 @@ object ColumnPruning extends Rule[LogicalPlan] {
// Can't prune the columns on LeafNode
case p @ Project(_, _: LeafNode) => p
+ case p @ NestedColumnAliasing(nestedFieldToAlias, attrToAliases)
Review comment:
We don't need to compute `getAliasSubMap` in `NestedColumnAliasing` if
`nestedSchemaPruningEnabled` is false, right?
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