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https://issues.apache.org/jira/browse/FLINK-22737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354250#comment-17354250
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Ingo Bürk commented on FLINK-22737:
-----------------------------------
I discussed this again with Timo, and we will go with the Unix epoch instead of
NULL now. To summarize:
* CURRENT_WATERMARK(<column>)
* Error if the provided column is not a rowtime column
* The returned type is that of the provided column (TIMESTAMP /
TIMESTAMP_LTZ), but we force the precision to 3.
* If no watermark has been emitted yet, we return the Unix epoch.
> 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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