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https://issues.apache.org/jira/browse/FLINK-21623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17306176#comment-17306176
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Jark Wu commented on FLINK-21623:
---------------------------------

As discussed with [~Leonard Xu], we decide not support 
{{CURRENT_ROW_TIMESTAMP}} as a function id because of the CALCITE-4545. 
Therefore, users have to use {{CURRENT_ROW_TIMESTAMP()}} with parentheses for 
now. We can support function id syntax in the future when CALCITE-4545 is 
fixed. 

> Introduce CURRENT_ROW_TIMESTAMP function
> ----------------------------------------
>
>                 Key: FLINK-21623
>                 URL: https://issues.apache.org/jira/browse/FLINK-21623
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / API, Table SQL / Planner
>            Reporter: Leonard Xu
>            Assignee: Leonard Xu
>            Priority: Major
>              Labels: pull-request-available
>




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