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https://issues.apache.org/jira/browse/SPARK-697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian resolved SPARK-697.
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Resolution: Duplicate
> RDD should be covariant in T
> ----------------------------
>
> Key: SPARK-697
> URL: https://issues.apache.org/jira/browse/SPARK-697
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Ben Duffield
>
> It's currently causing me a lot of pain, but I'm not sure whether
> architectural concerns make this impossible.
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