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https://issues.apache.org/jira/browse/FLINK-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15121750#comment-15121750
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Till Rohrmann commented on FLINK-2678:
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Done. Great that you're picking this issue up :-)
> DataSet 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: DataSet API
> Reporter: Till Rohrmann
> Assignee: Subhobrata Dey
> Priority: Minor
>
> The DataSet 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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