HeartSaVioR commented on issue #22282: [SPARK-23539][SS] Add support for Kafka headers in Structured Streaming URL: https://github.com/apache/spark/pull/22282#issuecomment-476883917 While it might sound beyond the origin issue, for safety we may want to have a UT which simulates the situation @zsxwing stated about, restarting `dropDuplicate` query from checkpoint which is stored from 2.4. Here's one of example for checking compatibility via restarting query from checkpoint: https://github.com/apache/spark/blob/5624bfbcfe3004a957d43f7f69e5ea5e47fcd3c2/sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingAggregationSuite.scala#L591-L639
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