[jira] [Created] (SPARK-16189) Add ExistingRDD logical plan for input with RDD to have a chance to eliminate serialize/deserialize.

["Takuya Ueshin (JIRA)" <ji...@apache.org>]

Takuya Ueshin created SPARK-16189:
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             Summary: 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


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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