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https://issues.apache.org/jira/browse/FLINK-40425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18118067#comment-18118067
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Zeno Jove commented on FLINK-40425:
-----------------------------------

Hi [~dianfu] , if no one else is working on this, may I take this ticket?

My plan is to follow the API and boundary rules defined in FLIP-591. The 
implementation will focus on parameter passing and boundary normalization, 
while time attributes and streaming/batch restrictions will continue to be 
validated by the planner. timedelta will follow the existing DataFrame API 
behavior of truncating values to milliseconds. I will also add the related 
tests and documentation.
 
 

> Add OVER window aggregation support to DataFrame API
> ----------------------------------------------------
>
>                 Key: FLINK-40425
>                 URL: https://issues.apache.org/jira/browse/FLINK-40425
>             Project: Flink
>          Issue Type: Sub-task
>          Components: API / Python
>            Reporter: Liu Liu
>            Priority: Major
>
> Add OVER-window support to aggregate expressions:
> {{}}
> {code:java}
> def over(
>     self,
>     order_by,
>     *,
>     partition_by=None,
>     rows=None,
>     range=None,
> ) -> Expression {code}



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