Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/19196#discussion_r138414658
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala
---
@@ -53,6 +53,8 @@ case class StatefulOperatorStateInfo(
trait StatefulOperator extends SparkPlan {
def stateInfo: Option[StatefulOperatorStateInfo]
+ def keyExpressions: Seq[Attribute]
--- End diff --
we don't need to expose this if we don't want to
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