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Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2017/10/16 08:19:00 UTC

[jira] [Updated] (FLINK-7548) Support watermark generation for TableSource

     [ https://issues.apache.org/jira/browse/FLINK-7548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske updated FLINK-7548:
---------------------------------
    Priority: Blocker  (was: Major)

> Support watermark generation for TableSource
> --------------------------------------------
>
>                 Key: FLINK-7548
>                 URL: https://issues.apache.org/jira/browse/FLINK-7548
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: Jark Wu
>            Assignee: Fabian Hueske
>            Priority: Blocker
>
> 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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