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https://issues.apache.org/jira/browse/SPARK-10303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen deleted SPARK-10303:
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> Spark SQL JSON Reader uses inefficient form of Union operation
> --------------------------------------------------------------
>
> Key: SPARK-10303
> URL: https://issues.apache.org/jira/browse/SPARK-10303
> Project: Spark
> Issue Type: Bug
> Reporter: Josh Rosen
>
> See attached screenshot. For a job that uses SQLContext's JSON reader, the
> RDD DAG visualization shows that Spark is using an inefficient version of
> Union which chains together many UnionRDDs as opposed to the more-efficient
> form of UnionRDD that accepts a larger list of child RDDs.
> !screenshot-1.png!
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