Xuefu Zhang created HIVE-8219:
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Summary: Multi-Insert optimization, don't sink the source into a
file [Spark Branch]
Key: HIVE-8219
URL: https://issues.apache.org/jira/browse/HIVE-8219
Project: Hive
Issue Type: Bug
Components: Spark
Reporter: Xuefu Zhang
Current implementation split the operator plan at the lowest common ancester by
inserting one FileSinkOperator and a list of TableScanOperators. Writing to a
file (by the FS) is expensive. We should be able to insert a ReduceSinkOperator
instead. The result RDD from the first job can be cached and refereed in
subsequent Spark jobs.
This is a followup for HIVE-7503.
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