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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7548) Support watermark generation for TableSource
Date Fri, 27 Oct 2017 09:34:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16222013#comment-16222013
] 

ASF GitHub Bot commented on FLINK-7548:
---------------------------------------

Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/4894
  
    Thanks for the feedback @twalthr.
    I pushed an update.


> 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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