XiaoJing wang created SPARK-4485:
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Summary: Add broadcast outer join to optimize left outer join and
right outer join
Key: SPARK-4485
URL: https://issues.apache.org/jira/browse/SPARK-4485
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.1.0
Reporter: XiaoJing wang
Priority: Minor
For now, spark use broadcast join instead of hash join to optimize {{inner
join}} when the size of one side data did not reach the
{{AUTO_BROADCASTJOIN_THRESHOLD}}
However,Spark SQL will perform shuffle operations on each child relations while
executing
{{left outer join}} and {{right outer join}}. {outer join}} is more suitable
for optimiztion with broadcast join.
We are planning to create a {{BroadcastHashouterJoin}} to implement the
broadcast join for {{left outer join}} and {{right outer join}}
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