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https://issues.apache.org/jira/browse/SPARK-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin updated SPARK-9258:
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Summary: Remove all semi join physical operator (was: Remove
BroadcastLeftSemiJoinHash)
> Remove all semi join physical operator
> --------------------------------------
>
> Key: SPARK-9258
> URL: https://issues.apache.org/jira/browse/SPARK-9258
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
>
> We have too many join operators than our resources to optimize them. In this
> case, BroadcastLeftSemiJoinHash isn't very necessary. We can still use an
> equi-join operator to do the join, and just not include any values from the
> other join.
> We waste a little bit space due to building a hash map rather than a hash
> set, but at the end of the day unless we are going to spend a lot of time
> optimizing hash set, our Tungsten hash map will be a lot more efficient than
> the hash set anyway ...
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