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Posted to dev@drill.apache.org by "Timothy Chen (JIRA)" <ji...@apache.org> on 2013/11/22 07:35:35 UTC

[jira] [Created] (DRILL-305) Implement hash join

Timothy Chen created DRILL-305:
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             Summary: Implement hash join 
                 Key: DRILL-305
                 URL: https://issues.apache.org/jira/browse/DRILL-305
             Project: Apache Drill
          Issue Type: New Feature
            Reporter: Timothy Chen
            Assignee: Timothy Chen


To perform better joins against small fact tables (I believe tpch has a case like this) we want to add hash join as another join impl.

There are a variety of hash join strategies but I plan to start with a basic one where assuming one side fits entirely in memory.

Part of this is to look for a good off heap hash map impl or potentially write one if none seems fit.



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