Re: [PR] [SPARK-58996][SQL][4.2] Fix SPJ partially clustered data correctness when EnsureRequirements re-runs [spark]

["ulysses-you (via GitHub)" <gi...@apache.org>]

ulysses-you commented on code in PR #58561:
URL: https://github.com/apache/spark/pull/58561#discussion_r3947134144


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala:
##########
@@ -789,6 +789,28 @@ case class PartitioningCollection(partitionings: Seq[Partitioning])
     super.legacyWithNewChildren(newChildren).asInstanceOf[PartitioningCollection]
 }
 
+object PartitioningCollection {
+  /**
+   * One [[KeyedPartitioning]] standing for every one in this partitioning, if there is any. By the
+   * invariant in the class doc, any of them describes the layout.
+   */
+  private[physical] def representativeOf(p: Partitioning): Option[KeyedPartitioning] = p match {

Review Comment:
   this is an additionally introducing for branch-4.2



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