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https://issues.apache.org/jira/browse/FLINK-22737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354307#comment-17354307
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Jark Wu edited comment on FLINK-22737 at 5/31/21, 10:16 AM:
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-{{FROM T where rowtime >= CURRENT_WATERMARK}} is not a valid query, because
the condition is also false before watermark emitted even if it returns {{0}}
or {{Long.MIN}} instead of {{NULL}}.-
was (Author: jark):
{{FROM T where rowtime >= CURRENT_WATERMARK}} is not a valid query, because the
condition is also false before watermark emitted even if it returns {{0}} or
{{Long.MIN}} instead of {{NULL}}.
> Add support for CURRENT_WATERMARK to SQL
> ----------------------------------------
>
> Key: FLINK-22737
> URL: https://issues.apache.org/jira/browse/FLINK-22737
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: David Anderson
> Assignee: Ingo Bürk
> Priority: Major
>
> With a built-in function returning the current watermark, one could operate
> on late events without resorting to using the DataStream API.
> Called with zero parameters, this function returns the current watermark for
> the current row – if there is an event time attribute. Otherwise, it returns
> NULL.
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