Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/9844#issuecomment-158870885
how about this:
```
val unresolvedSortOrders = sortOrders.filterNot(_.resolved)
val resolvedSortOrders = ... // the original logic that copy to aggregate
expression and call execute
val sortOrdersMap =
unresolvedSortOrders.map(TreeNodeRef(_)).zip(resolvedSortOrders).toMap
val finalSortOrders = sortOrders.map(s =>
sortOrdersMap.getOrElse(TreeNodeRef(s), s))
```
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