Wenchen Fan created SPARK-12931:
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Summary: Improve bucket read path to only create one single RDD
Key: SPARK-12931
URL: https://issues.apache.org/jira/browse/SPARK-12931
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Wenchen Fan
Currently we will create one RDD per bucket and coalesce it to one partition,
and finally union them to a final RDD. We should create a single RDD instead,
it requires to modify the data source interface a little bit and abstract the
logic of reader out to decouple it from RDD.
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