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https://issues.apache.org/jira/browse/FLINK-6214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964862#comment-16964862
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Kostas Kloudas commented on FLINK-6214:
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>From the discussion here it seems that there is an alternative way of
>implementing the functionality proposed, without making any changes in the
>codebase. In addition, there does not seem to be much interest neither in the
>PR nor here.
Given the above, and the fact that the windowing code in Flink is already a bit
complicated, I will close this issue.
Feel free to re-open it if you think that this is a valid addition.
> WindowAssigners do not allow negative offsets
> ---------------------------------------------
>
> Key: FLINK-6214
> URL: https://issues.apache.org/jira/browse/FLINK-6214
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.2.0
> Reporter: Timo Walther
> Assignee: leesf
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Both the website and the JavaDoc promotes
> ".window(TumblingEventTimeWindows.of(Time.days(1), Time.hours(-8))) For
> example, in China you would have to specify an offset of Time.hours(-8)". But
> both the sliding and tumbling event time assigners do not allow offset to be
> negative.
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