Github user scwf commented on a diff in the pull request:
https://github.com/apache/spark/pull/16677#discussion_r97700568
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
---
@@ -230,6 +230,21 @@ case object SinglePartition extends Partitioning {
}
/**
+ * Represents a partitioning where rows are only serialized/deserialized
locally. The number
+ * of partitions are not changed and also the distribution of rows. This
is mainly used to
+ * obtain some statistics of map tasks such as number of outputs.
+ */
+case class FakePartitioning(orgPartition: Partitioning, numPartitions:
Int) extends Partitioning {
--- End diff --
how about `LocalPartitioning`
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