[GitHub] [spark] cloud-fan commented on a change in pull request #35924: [SPARK-38578][SQL] Avoid unnecessary sort in FileFormatWriter if user has specified sort in AQE

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #35924:
URL: https://github.com/apache/spark/pull/35924#discussion_r832139049



##########
File path: sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEUtils.scala
##########
@@ -57,4 +58,24 @@ object AQEUtils {
       }
     case _ => Some(UnspecifiedDistribution)
   }
+
+  // Analyze the given plan and calculate the required ordering of this plan w.r.t. the
+  // user-specified sort.
+  def getRequiredOrdering(p: SparkPlan): Seq[SortOrder] = p match {
+    case f: FilterExec => getRequiredOrdering(f.child)

Review comment:
       Let's put the similar code comments in `getRequiredDistribution`:
   ```
   // User-specified repartition is only effective when it's the root node, or under
   ...
   ```




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