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https://issues.apache.org/jira/browse/FLINK-2315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098959#comment-15098959
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Stephan Ewen commented on FLINK-2315:
-------------------------------------
The methods should be called if the program attempts to sort the data on such a
field of such a type, for example if you group data by that a field of that
specific type (any for testing best no composite key).
> Hadoop Writables cannot exploit implementing NormalizableKey
> ------------------------------------------------------------
>
> Key: FLINK-2315
> URL: https://issues.apache.org/jira/browse/FLINK-2315
> Project: Flink
> Issue Type: Bug
> Components: DataSet API
> Affects Versions: 0.9
> Reporter: Stephan Ewen
> Fix For: 1.0.0
>
>
> When one implements a type that extends {{hadoop.io.Writable}} and it
> implements {{NormalizableKey}}, this is still not exploited.
> The Writable comparator fails to recognize that.
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