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https://issues.apache.org/jira/browse/FLINK-7548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske updated FLINK-7548:
---------------------------------
    Issue Type: Improvement  (was: Bug)

> Support watermark generation for TableSource
> --------------------------------------------
>
>                 Key: FLINK-7548
>                 URL: https://issues.apache.org/jira/browse/FLINK-7548
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Jark Wu
>            Assignee: Fabian Hueske
>            Priority: Blocker
>             Fix For: 1.4.0
>
>
> As discussed in FLINK-7446, currently the TableSource only support to define 
> rowtime field, but not support to extract watermarks from the rowtime field. 
> We can provide a new interface called {{DefinedWatermark}}, which has two 
> methods {{getRowtimeAttribute}} (can only be an existing field) and 
> {{getWatermarkGenerator}}. The {{DefinedRowtimeAttribute}} will be marked 
> deprecated.
> How to support periodic and punctuated watermarks and support some built-in 
> strategies needs further discussion.



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