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https://issues.apache.org/jira/browse/SPARK-16189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-16189.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 13890
[https://github.com/apache/spark/pull/13890]
> Add ExistingRDD logical plan for input with RDD to have a chance to eliminate
> serialize/deserialize.
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-16189
> URL: https://issues.apache.org/jira/browse/SPARK-16189
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Takuya Ueshin
> Fix For: 2.1.0
>
>
> Currently the input {{RDD}} of {{Dataset}} is always serialized to
> {{RDD\[InternalRow\]}} prior to being as {{Dataset}}, but there is a case
> that we use {{map}} or {{mapPartitions}} just after converted to {{Dataset}}.
> In this case, serialize and then deserialize happens but it would not be
> needed.
> This patch adds {{ExistingRDD}} logical plan for input with {{RDD}} to have a
> chance to eliminate serialize/deserialize.
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