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https://issues.apache.org/jira/browse/SPARK-6838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-6838.
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Resolution: Incomplete
> Explore using Reference Classes instead of S4 objects
> -----------------------------------------------------
>
> Key: SPARK-6838
> URL: https://issues.apache.org/jira/browse/SPARK-6838
> Project: Spark
> Issue Type: Improvement
> Components: SparkR
> Reporter: Shivaram Venkataraman
> Priority: Minor
> Labels: bulk-closed
>
> The current RDD and PipelinedRDD are represented in S4 objects. R has a new
> OO system: Reference Class (RC or R5). It seems to be a more message-passing
> OO and instances are mutable objects. It is not an important issue, but it
> should also require trivial work. It could also remove the kind-of awkward
> "@" operator in S4.
> R6 is also worth checking out. Feels closer to your ordinary object oriented
> language. https://github.com/wch/R6
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