cloud-fan commented on code in PR #43435:
URL: https://github.com/apache/spark/pull/43435#discussion_r1375881810
##########
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])
+ extends Expression with Partitioning with Unevaluable {
+
+ override def children: Seq[Expression] = from.expressions
+ override def nullable: Boolean = from.nullable
+ override def dataType: DataType = from.dataType
+
+ override def satisfies0(required: Distribution): Boolean =
from.satisfies0(required)
+
+ override def createShuffleSpec(distribution: ClusteredDistribution):
ShuffleSpec =
+ CoalescedHashShuffleSpec(from.createShuffleSpec(distribution), partitions)
+
+ override protected def withNewChildrenInternal(
+ newChildren: IndexedSeq[Expression]): CoalescedHashPartitioning =
+ copy(from = from.copy(expressions = newChildren))
+
+ override val numPartitions: Int = partitions.length
+
+ override def stringArgs: Iterator[Any] = Iterator(from)
Review Comment:
this looks weird, maybe just overwrite `toString` and `sql` to call
`from.toString/sql`
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