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Michael Armbrust resolved SPARK-4570. ------------------------------------- Resolution: Fixed Fix Version/s: (was: 1.1.0) 1.3.0 Issue resolved by pull request 3442 [https://github.com/apache/spark/pull/3442] > Add broadcast join to left semi join > ------------------------------------- > > Key: SPARK-4570 > URL: https://issues.apache.org/jira/browse/SPARK-4570 > Project: Spark > Issue Type: Improvement > Components: SQL > Affects Versions: 1.1.0 > Reporter: XiaoJing wang > Priority: Minor > Fix For: 1.3.0 > > > 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 semi join}} is more suitable for optimiztion with > broadcast join. > We are planning to create a{{BroadcastLeftSemiJoinHash}} to implement the > broadcast join for {{left semi join}} -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org