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https://issues.apache.org/jira/browse/FLINK-1408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske closed FLINK-1408.
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Resolution: Invalid
Feature is already implemented.
> Add group sorting with expression key
> -------------------------------------
>
> Key: FLINK-1408
> URL: https://issues.apache.org/jira/browse/FLINK-1408
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Priority: Minor
>
> Currently groups can only be sorted using field indexes (for tuples) and key
> selection function.
> {{persons.groupBy("name").sortGroup("age",
> Order.DESCENDING).groupReduce(do-something-here);}}
> Would be good to allow group sorting also with field expressions for Pojos.
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