HeartSaVioR commented 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-458281100 > Thanks for the explanation, so it seems the right side rows are retained until the global watermark (min of left and right watermarks). But the left side rows are evicted later due to the join condition and then it joins with a 'null' in the right side since the right side got evicted before. Exactly. Thanks for spending time to understand the details.
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