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https://issues.apache.org/jira/browse/FLINK-19612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17251090#comment-17251090
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Jark Wu commented on FLINK-19612:
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Hi [~maosuhan], CUMULATE is not a keyword, but just a builtin function name.
FLIP-145 doesn't cover custom window function, this should be discussed
separately.
> Support CUMULATE window table function in planner
> -------------------------------------------------
>
> Key: FLINK-19612
> URL: https://issues.apache.org/jira/browse/FLINK-19612
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Jark Wu
> Assignee: Jark Wu
> Priority: Major
> Fix For: 1.13.0
>
>
> Introduce the CUMULATE customized window table function in planner. And
> support cumulative windows in window aggregate, etc.
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