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https://issues.apache.org/jira/browse/FLINK-4597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15473160#comment-15473160
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Jark Wu commented on FLINK-4597:
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I have a look at Calcite documentation [1] , this syntax is concise and clear.
+1 for this and I will close this issue.
[1] https://calcite.apache.org/docs/reference.html#comparison-operators
> Improve Scalar Function section in Table API documentation
> ----------------------------------------------------------
>
> Key: FLINK-4597
> URL: https://issues.apache.org/jira/browse/FLINK-4597
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Jark Wu
> Assignee: Jark Wu
> Priority: Minor
>
> The function signature in Scalar Function section is a little confusing.
> Because it's hard to distinguish keyword and parameters. Such as :
> {{EXTRACT(TIMEINTERVALUNIT FROM TEMPORAL)}}, user may not know TEMPORAL is a
> parameter after first glance. I propose to use {{<>}} around parameters, i.e.
> {{EXTRACT(<TIMEINTERVALUNIT> FROM <TEMPORAL>)}}
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