Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/5208#discussion_r28302328
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -72,6 +72,12 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
def requiredChildDistribution: Seq[Distribution] =
Seq.fill(children.size)(UnspecifiedDistribution)
+ /** Specifies how data is ordered in each partition. */
+ def outputOrdering: Option[Ordering[Row]] = None
--- End diff --
I changed this from `Seq[SortOrder]` because you asked me not to manually
bindReference in `SortMergeJoin.scala` but do it when constructing the
RowOrdering. So I just create RowOrdering directly there.
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