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https://issues.apache.org/jira/browse/FLINK-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14143281#comment-14143281
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Robert Metzger commented on FLINK-1112:
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I will also add support for key expression-based key selecton.
> Add GroupSorting with KeySelectors
> ----------------------------------
>
> Key: FLINK-1112
> URL: https://issues.apache.org/jira/browse/FLINK-1112
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API
> Reporter: Fabian Hueske
>
> Group sorting is currently only supported for field-index keys and not for
> KeySelectors.
> This feature was requested.
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