HeartSaVioR commented on a change in pull request #35419:
URL: https://github.com/apache/spark/pull/35419#discussion_r805734667
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
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@@ -90,6 +90,34 @@ case class ClusteredDistribution(
}
}
+/**
+ * Represents the requirement of distribution on the stateful operator.
+ *
+ * Each partition in stateful operator initializes state store(s), which are
independent with state
+ * store(s) in other partitions. Since it is not possible to repartition the
data in state store,
+ * Spark should make sure the physical partitioning of the stateful operator
is unchanged across
+ * Spark versions. Violation of this requirement may bring silent correctness
issue.
+ *
+ * Since this distribution relies on [[HashPartitioning]] on the physical
partitioning of the
+ * stateful operator, only [[HashPartitioning]] can satisfy this distribution.
Review comment:
#35512
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