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From "sunjincheng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-6462) Add requiresOver interface for AggregateFunction
Date Mon, 08 May 2017 04:05:04 GMT

     [ https://issues.apache.org/jira/browse/FLINK-6462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

sunjincheng updated FLINK-6462:
    Summary: Add requiresOver interface for  AggregateFunction  (was: Add requires over indicators

> Add requiresOver interface for  AggregateFunction
> -------------------------------------------------
>                 Key: FLINK-6462
>                 URL: https://issues.apache.org/jira/browse/FLINK-6462
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
> The window function in the standard database only supports the "over" window, such as
`LAG`,` LEAD`, `FIRST_VALUE`,` LAST_VALUE`. These window functions do not apply to `Slide`,`
Tumble`, `Session` window. So when the user-defined AGG need to be clearly defined. In calcite
`SqlAggFunction` will using `requiresOver` to distinguish. 
> In this JIRA. will deal with this feature.

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