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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/09/30 20:40:05 UTC

[jira] [Closed] (SPARK-3862) MultiWayBroadcastInnerHashJoin

     [ https://issues.apache.org/jira/browse/SPARK-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin closed SPARK-3862.
------------------------------
    Resolution: Won't Fix

Closing this one for now since I think we can do something better with codegen without building specialized operators.

> MultiWayBroadcastInnerHashJoin
> ------------------------------
>
>                 Key: SPARK-3862
>                 URL: https://issues.apache.org/jira/browse/SPARK-3862
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>
> It is common to have a single fact table inner join many small dimension tables.  We can exploit this fact and create a MultiWayBroadcastInnerHashJoin (or maybe just MultiwayDimensionJoin) operator that optimizes for this pattern.



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