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https://issues.apache.org/jira/browse/FLINK-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134448#comment-16134448
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Jark Wu commented on FLINK-7446:
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>From my perspective, I think TableSource should provide an interface to define
>timestamp and watermark at the same time. The {{DefinedRowtimeAttribute}} is
>not a good design. A TableSource is not come from a DataStream, it is
>converted into DataStream, so that the timestamp and watermark should be
>defined by the TableSource not the DataStream.
"generate timestamps and watermarks and validate that field and extracted
timestamp are the same" is the validation happens at runtime? If it is, I
prefer the later one.
> Support to define an existing field as the rowtime field for TableSource
> ------------------------------------------------------------------------
>
> Key: FLINK-7446
> URL: https://issues.apache.org/jira/browse/FLINK-7446
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Jark Wu
> Assignee: Jark Wu
>
> Currently {{DefinedRowtimeAttribute}} can define an appended rowtime field
> for a {{TableSource}}. But it would be helpful if we can support to define an
> existing field as the rowtime field. Just like registering a DataStream, the
> rowtime field can be appended but also can replace an existing field.
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