Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1822#discussion_r16196431
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Aggregate.scala ---
@@ -58,7 +59,7 @@ case class Aggregate(
// HACK: Generators don't correctly preserve their output through
serializations so we grab
// out child's output attributes statically here.
- private[this] val childOutput = child.output
+ val childOutput = child.output
--- End diff --
`protected` instead of making this public.
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