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https://issues.apache.org/jira/browse/FLINK-2229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628076#comment-14628076
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Maximilian Michels commented on FLINK-2229:
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Also added the fix to the release-0.9 branch for 0.9.1.
> Data sets involving non-primitive arrays cannot be unioned
> ----------------------------------------------------------
>
> Key: FLINK-2229
> URL: https://issues.apache.org/jira/browse/FLINK-2229
> Project: Flink
> Issue Type: Bug
> Components: Java API, Scala API
> Affects Versions: 0.9, 0.10, 0.9.0
> Reporter: Sebastian Kruse
> Assignee: Sebastian Kruse
> Fix For: 0.10, 0.9.1
>
>
> The class {{ObjectArrayTypeInfo}} misses {{equals(...)}} and {{hashCode()}}.
> This becomes an issue when applying a union to data sets that somehow involve
> non-primitive arrays, because their data types appear to be different even
> though they are not.
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