Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5208#discussion_r28198883
--- 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: Seq[SortOrder] = Nil
+
+ /** Specifies sort order for each partition requirements on the input
data for this operator. */
+ def requiredInPartitionOrdering: Seq[Seq[SortOrder]] =
Seq.fill(children.size)(Nil)
--- End diff --
Lets stay consistent with the naming, `requiredChildOrdering` or maybe
`requireChildPartitionOrdering` if you think the first is unclear.
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