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https://issues.apache.org/jira/browse/FLINK-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745335#comment-14745335
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Stephan Ewen commented on FLINK-2678:
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Wow, is this a common case?
> Java/Scala API does not support multi-dimensional arrays as keys
> ----------------------------------------------------------------
>
> Key: FLINK-2678
> URL: https://issues.apache.org/jira/browse/FLINK-2678
> Project: Flink
> Issue Type: Wish
> Components: Java API, Scala API
> Reporter: Till Rohrmann
> Priority: Minor
>
> The Java/Scala API does not support grouping/sorting on field which are
> multi-dimensional arrays. It could be helpful to also support these types.
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