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https://issues.apache.org/jira/browse/FLINK-6813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sunjincheng updated FLINK-6813:
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Summary: Add DATEDIFF supported in SQL (was: Add DATEDIFF as build-in
scalar function)
> Add DATEDIFF supported in SQL
> -----------------------------
>
> Key: FLINK-6813
> URL: https://issues.apache.org/jira/browse/FLINK-6813
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> * Syntax
> DATEDIFF ( datepart , startdate , enddate )
> -datepart
> Is the part of startdate and enddate that specifies the type of boundary
> crossed.
> -startdate
> Is an expression that can be resolved to a time, date.
> -enddate
> Same with startdate.
> * Example
> SELECT DATEDIFF(year, '2015-12-31 23:59:59.9999999', '2017-01-01
> 00:00:00.0000000') from tab; --> 2
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