Github user uncleGen commented on a diff in the pull request: https://github.com/apache/spark/pull/17052#discussion_r102922775 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala --- @@ -393,6 +393,17 @@ case class PreprocessTableInsertion(conf: SQLConf) extends Rule[LogicalPlan] { } /** + * A rule to do check if the aggregate is stateful. + */ +class ResolveStatefulAggregate() extends Rule[LogicalPlan] { + def apply(plan: LogicalPlan): LogicalPlan = plan transform { + case agg @ Aggregate(groupingExpressions, aggregateExpressions, child, _) + if agg.isStreaming => + Aggregate(groupingExpressions, aggregateExpressions, child, stateful = true) + } --- End diff -- resolve one aggregate, determine statefule or not.
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