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https://issues.apache.org/jira/browse/FLINK-22737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354341#comment-17354341
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JING ZHANG edited comment on FLINK-22737 at 5/31/21, 9:37 AM:
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[~jark] Would you please explain a little more about why `T where rowtime >=
CURRENT_WATERMARK` would also return false before watermark emitted even if it
returns {{0}} or {{Long.MIN}} instead of {{NULL? I thought it would return true
if CURRENT_WATERMARK returns }}{{0}}{{ or }}{{Long.MIN}}{{, it would return
false only if CURRENT_WATERMARK return null.}}
was (Author: qingru zhang):
[~jark] Would you please explain a little more about why `T where rowtime >=
CURRENT_WATERMARK` would also return false before watermark emitted even if it
returns {{0}} or {{Long.MIN}} instead of {{NULL? I thought it would return true
if CURRENT_WATERMARK returns }}{{0}}{{ or }}{{Long.MIN}}{{ instead of
}}{{NULL, it would return false only if CURRENT_WATERMARK return 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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