viirya commented on a change in pull request #24637: [SPARK-27707][SQL] Prune
unnecessary nested fields from Generate in explode
URL: https://github.com/apache/spark/pull/24637#discussion_r299876409
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -588,6 +588,16 @@ object ColumnPruning extends Rule[LogicalPlan] {
.map(_._2)
p.copy(child = g.copy(child = newChild, unrequiredChildIndex =
unrequiredIndices))
+ // prune unrequired nested fields
+ case p @ Project(projectList, g: Generate) =>
Review comment:
This looks a general fix no matter the setting of `nestedSchemaPruning` is.
Do we need a config to disable this?
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