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https://issues.apache.org/jira/browse/GEARPUMP-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16046143#comment-16046143
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ASF GitHub Bot commented on GEARPUMP-316:
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Github user manuzhang commented on the issue:
https://github.com/apache/incubator-gearpump/pull/186
@huafengw Added more descriptions.
> Don't enforce groupBy after window
> ----------------------------------
>
> Key: GEARPUMP-316
> URL: https://issues.apache.org/jira/browse/GEARPUMP-316
> Project: Apache Gearpump
> Issue Type: Sub-task
> Components: streaming
> Reporter: Manu Zhang
> Assignee: Manu Zhang
>
> Return a normal Stream instead of WindowStream on window function. Window
> function defines a boundary (window) for elements and the following
> operations should fall in corresponding boundaries. The boundary should not
> change until a new window function is defined. The default boundary is the
> {{GlobalWindows}} if not defined.
> This means there will be a window context for each underlying task. Elements
> are emitted in terms of the trigger semantics.
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