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https://issues.apache.org/jira/browse/FLINK-5299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15735576#comment-15735576
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Greg Hogan commented on FLINK-5299:
-----------------------------------
Could the {{KeySelector}} return {{Integer}} which has a self-referencing
{{hashCode()}}?
> 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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