[jira] [Updated] (SPARK-9258) Remove all semi join physical operator

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-9258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-9258:
-------------------------------
    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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