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-457405492 > I think it's incorrect to evict R1 if we aren't also evicting all rows in L which R1 could have matched with. My understanding for storing rows in state is for matching against new rows, not for concerning previous status. If we have to keep rows in right side due to joined left side rows are not evicted (may end up with also waiting for 5 seconds in above case), we end up unnecessary storing rows for right side (which cannot be matched against new rows in left side) which can be just replaced with matched flag.
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