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https://issues.apache.org/jira/browse/FLINK-6473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16410945#comment-16410945
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Fabian Hueske commented on FLINK-6473:
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Have a look at the interface of the [user-defined aggregate
functions|[https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/table/udfs.html#aggregation-functions].]
Incremental windows use {{accumulate()}} and {{retract()}} to add and remove
values from an aggregation result.
> Add OVER window support for batch tables
> ----------------------------------------
>
> Key: FLINK-6473
> URL: https://issues.apache.org/jira/browse/FLINK-6473
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Fabian Hueske
> Priority: Major
>
> Add support for OVER windows for batch tables.
> Since OVER windows are supported for streaming tables, this issue is not
> about the API (which is available) but about adding the execution strategies
> and translation for OVER windows on batch tables.
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