[GitHub] spark pull request #22260: [SQL][MINOR] Fix compiling for scala 2.12

[sadhen <gi...@git.apache.org>]

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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