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From xccui <...@git.apache.org>
Subject [GitHub] flink issue #5094: [FLINK-8158] [table] Fix rowtime window inner join emits ...
Date Wed, 29 Nov 2017 16:20:20 GMT
Github user xccui commented on the issue:

    https://github.com/apache/flink/pull/5094
  
    Hi @hequn8128, as @fhueske explained, watermarks should not define the semantics of the
join. We just emit join results, in spite of whether they are late and the join function should
not care about the lateness. You can take "holding back watermarks" as a special watermark
assigner, based on which, there could be out-of-ordered data (join results) being taken as
late. Currently, we just generates watermarks with a static delay that equals to the larger
relative offset. In the future, we should dynamically decide whether a join result is late
according to the real cache size.


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