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https://issues.apache.org/jira/browse/SPARK-540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-540.
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    Resolution: Not A Problem

I assume this is subsumed by things like dataframes and the dataset API.

> Add API to customize in-memory representation of RDDs
> -----------------------------------------------------
>
>                 Key: SPARK-540
>                 URL: https://issues.apache.org/jira/browse/SPARK-540
>             Project: Spark
>          Issue Type: New Feature
>          Components: Spark Core
>            Reporter: Matei Zaharia
>            Priority: Minor
>
> Right now the choice between serialized caching and just Java objects in dev 
> is fine, but it might be cool to also support structures such as 
> column-oriented storage through arrays of primitives without forcing it 
> through the serialization interface.



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