eejbyfeldt commented on code in PR #43435:
URL: https://github.com/apache/spark/pull/43435#discussion_r1368512972
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala:
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@@ -306,6 +306,34 @@ case class HashPartitioning(expressions: Seq[Expression],
numPartitions: Int)
override protected def withNewChildrenInternal(
newChildren: IndexedSeq[Expression]): HashPartitioning = copy(expressions
= newChildren)
+
+}
+
+case class CoalescedBoundary(startReducerIndex: Int, endReducerIndex: Int)
+
+/**
+ * Represents a partitioning where partitions have been coalesced from a
HashPartitioning into a
+ * fewer number of partitions.
+ */
+case class CoalescedHashPartitioning(from: HashPartitioning, partitions:
Seq[CoalescedBoundary])
Review Comment:
Probably. What is the reason behind it? Is that we never intentionally what
to serialize this class and if we do we will not really use it?
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