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https://issues.apache.org/jira/browse/FLINK-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179072#comment-16179072
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ASF GitHub Bot commented on FLINK-7446:
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Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/4710
@haohui We only cast ROWTIME / PROCTIME directly to LONG during runtime,
the special types are needed during pre-flight phase and validation. We could
not come up with a better solution that ensures that watermarks stay aligned
with the rowtime.
> 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: Fabian Hueske
>
> 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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