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https://issues.apache.org/jira/browse/FLINK-5299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734216#comment-15734216
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Aljoscha Krettek commented on FLINK-5299:
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A {{KeySelector}} that calls {{Arrays.hashCode(values)}} will not work because
the {{KeySelector}} does usually not calculate the hash but just return the
key. I think we would need to wrap the array into a special type that has a
{{hashCode()}} method that returns the right value so that when Flink calls
{{hashCode()}} we get the correct array hash.
> DataStream support for arrays as keys
> -------------------------------------
>
> Key: FLINK-5299
> URL: https://issues.apache.org/jira/browse/FLINK-5299
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Chesnay Schepler
> Labels: star
>
> It is currently not possible to use an array as a key in the DataStream api,
> as it relies on hashcodes which aren't stable for arrays.
> One way to implement this would be to check for the key type and inject a
> KeySelector that calls "Arrays.hashcode(values)".
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