[jira] [Created] (FLINK-22737) Add support for CURRENT_WATERMARK to SQL

[Shang Yuanchun (Jira)]

David Anderson created FLINK-22737:
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             Summary: 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


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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