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https://issues.apache.org/jira/browse/FLINK-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16253370#comment-16253370
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ASF GitHub Bot commented on FLINK-8069:
---------------------------------------

Github user xccui commented on the issue:

    https://github.com/apache/flink/pull/5016
  
    Thanks for the review @fhueske. I think you are right. A dedicated 
`WatermarkStrategy` with watermark-preserve semantics  should be better. I'll 
update the PR according to your comments. Thanks.


> Support empty watermark strategy for TableSources
> -------------------------------------------------
>
>                 Key: FLINK-8069
>                 URL: https://issues.apache.org/jira/browse/FLINK-8069
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Xingcan Cui
>
> In case the underlying data stream source emits watermarks, it should be 
> possible to define an empty watermark strategy for rowtime attributes in the 
> {{RowtimeAttributeDescriptor}}.



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