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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 14:45:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251475#comment-16251475
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Timo Walther commented on FLINK-8069:
-------------------------------------

Given you have a TableSource like this: https://github.com/dataArtisans/flink-training-exercises/blob/master/src/main/java/com/dataartisans/flinktraining/exercises/table_java/sources/TaxiRideTableSource.java
And the custom TaxiRideSource already emits watermarks and assigns timestamps.

We need a to define a {{RowtimeAttributeDescriptor("eventTime", new StreamRecordTimestamp(),
WatermarkStrategy???)}}  when implementing {{DefinedRowtimeAttributes}}. So an explicit empty
watermark strategy that does basically nothing, is needed in this use case.

> 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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