Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19281#discussion_r139873950
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkPlan.scala ---
@@ -396,6 +396,26 @@ abstract class SparkPlan extends QueryPlan[SparkPlan]
with Logging with Serializ
object SparkPlan {
private[execution] val subqueryExecutionContext =
ExecutionContext.fromExecutorService(
ThreadUtils.newDaemonCachedThreadPool("subquery", 16))
+
+ /**
+ * Returns if the actual ordering satisfies the required ordering.
+ *
+ * Ordering A satisfies ordering B if and only if B is an equivalent of
A or of A's prefix.
+ */
+ def orderingSatisfies(actual: Seq[SortOrder], required: Seq[SortOrder]):
Boolean = {
--- End diff --
Let us first move it to `SortOrder`.
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