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From "Timo Walther (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8069) Support empty watermark strategy for TableSources
Date Tue, 14 Nov 2017 12:36:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251320#comment-16251320
] 

Timo Walther commented on FLINK-8069:
-------------------------------------

Hi [~xccui], we just had a use case where we are forced to supply some strategy but actually
our data source emits watermarks. We could either make it explicit by a new {{StreamRecordWatermark}}
class similar to {{StreamRecordTimestamp}} or just allow passing of {{null}}.

> 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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