Josh Rosen created SPARK-10303:
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Summary: 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
Components: SQL
Affects Versions: 1.5.0
Reporter: Josh Rosen
Attachments: screenshot-1.png
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.
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