Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/16758#discussion_r99748834 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala --- @@ -46,8 +46,13 @@ object UnsupportedOperationChecker { "Queries without streaming sources cannot be executed with writeStream.start()")(plan) } + /** Collect all the streaming aggregates in a sub plan */ + def collectStreamingAggregates(subplan: LogicalPlan): Seq[Aggregate] = { + subplan.collect { case a@Aggregate(_, _, _) if a.isStreaming => a } --- End diff -- done.
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