viirya commented on a change in pull request #32448:
URL: https://github.com/apache/spark/pull/32448#discussion_r629618659
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala
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@@ -38,7 +38,7 @@ object SchemaPruning extends SQLConfHelper {
// original schema
val mergedSchema = requestedRootFields
.map { root: RootField => StructType(Array(root.field)) }
- .reduceLeft(_ merge _)
+ .reduceLeft((left, right) => left.merge(right, resolver))
Review comment:
This merges some required fields at root level as a single `StructType`.
Looks okay.
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