[jira] [Created] (FLINK-19861) Improve the document of now() function

[Shang Yuanchun (Jira)]

hailong wang created FLINK-19861:
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             Summary: Improve the document of now() function
                 Key: FLINK-19861
                 URL: https://issues.apache.org/jira/browse/FLINK-19861
             Project: Flink
          Issue Type: Improvement
          Components: Documentation
    Affects Versions: 1.11.0
            Reporter: hailong wang
             Fix For: 1.12.0


`NOW()` function is deterministic in batch mode, but not deterministic in streaming.

 We should Improve the description of `NOW()` in /dev/table/functions/systemFunctions.md.

See the email thread, 

http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/How-to-understand-NOW-in-SQL-when-using-Table-amp-SQL-API-to-develop-a-streaming-app-tc38881.html#none



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