Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8383#discussion_r38589660
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/SortMergeOuterJoin.scala
---
@@ -71,6 +77,7 @@ case class SortMergeOuterJoin(
// For left and right outer joins, the output is ordered by the
streamed input's join keys.
case LeftOuter => requiredOrders(leftKeys)
case RightOuter => requiredOrders(rightKeys)
+ case FullOuter => requiredOrders(leftKeys ++ rightKeys)
--- End diff --
There will be null in both stream, so the order can't be maintained.
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