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https://issues.apache.org/jira/browse/FLINK-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564379#comment-14564379
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Márton Balassi commented on FLINK-2103:
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One slight difference is that the GroupedDataStream knows it goruping key and
this way the output of the partitioning will not know the partitioning key.
> Expose partitionBy to the user in Stream API
> --------------------------------------------
>
> Key: FLINK-2103
> URL: https://issues.apache.org/jira/browse/FLINK-2103
> Project: Flink
> Issue Type: Improvement
> Affects Versions: 0.9
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> Is there a reason why this is not exposed to the user? I could see cases
> where this would be useful to have.
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