Github user sadhen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22260#discussion_r213573236
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ProjectionOverSchema.scala
---
@@ -38,7 +38,7 @@ private[execution] case class
ProjectionOverSchema(schema: StructType) {
case GetArrayItem(child, arrayItemOrdinal) =>
getProjection(child).map { projection => GetArrayItem(projection,
arrayItemOrdinal) }
case a: GetArrayStructFields =>
- getProjection(a.child).map(p => (p, p.dataType)).map {
+ getProjection(a.child).map(p => (p, p.dataType)).collect {
--- End diff --
Well, there is a semantic change using `collect`. I will provide a unit
test to verify the change or simply using `sys.error`
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