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-459299774 Just applied the approach 2 and removed `[WIP]`. Also added the UT which restore the query from previous state (2.4.0). The code may have some redundant parts: not only state format but also the logic have to be versioned so it's not trivial to abstract them all. I'm planning to reduce duplication, but I'd be really appreciated someone could help me to find out where and how to clean up the code, or even restructure packages/traits/classes. Thanks in advance for all reviewers!
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