HeartSaVioR edited a comment on issue #23634: [SPARK-26154][SS] Streaming left/right outer join should not return outer nulls for already matched rows URL: https://github.com/apache/spark/pull/23634#issuecomment-464929292 I've addressed changing approach from having 3rd state store to adding `matched` field to 2nd state store. Please take a look at last commit I made to change the approach: https://github.com/apache/spark/pull/23634/commits/912a25023c86183a653c52e0fd9aef5651a6ad3d Though it didn't roll back refactoring I've done for state versioning, it would share a view to determine the difference between 3rd state store vs matched field in 2nd store.
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