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https://issues.apache.org/jira/browse/FLINK-2678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14745356#comment-14745356
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Till Rohrmann commented on FLINK-2678:
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Might not be too common. But looking at our {{TypeInformation}} it seems to be
me kind of arbitrary which types are supported as keys and which not. For
example, almost all special Scala type information which have been added at a
later stage, don't support to be used as a key, even though it should
theoretically be possible. For the sake of completeness, one could add this.
> 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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