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https://issues.apache.org/jira/browse/FLINK-19861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17222832#comment-17222832
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hailong wang commented on FLINK-19861:
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I prefer to improve as follow,
{code:java}
</td>
<td>
<p>Returns the current SQL timestamp in the UTC time zone. This function is
not deterministic which means it would be calculated for each record.</p>
<p>Only supported in blink planner.</p>
<p><b>Note:</b> <code>NOW()</code> is deterministic in SQL standard and
remains constant throughout life cycle of the job. The value is the start time
of the job.</p>
</td>
</tr>
{code}
WDYT [~jark]
> 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, Table SQL / API
> Affects Versions: 1.11.0
> Reporter: hailong wang
> Priority: Minor
> Fix For: 1.12.0
>
>
> `NOW()` function is deterministic in SQL standard, but not deterministic in
> Flink SQL.
> 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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