HyukjinKwon 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_r299436572
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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:
Out of curiosity, why don't we need another configuration then if
`spark.sql.optimizer.nestedSchemaPruning.enabled` isn't part of this
optimization, or fixing the doc of
`spark.sql.optimizer.nestedSchemaPruning.enabled`?
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