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Posted to issues@drill.apache.org by "weijie.tong (JIRA)" <ji...@apache.org> on 2019/06/06 10:01:00 UTC

[jira] [Created] (DRILL-7284) reusing the hashCodes computed at exchange nodes

weijie.tong created DRILL-7284:
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             Summary: reusing the hashCodes computed at exchange nodes
                 Key: DRILL-7284
                 URL: https://issues.apache.org/jira/browse/DRILL-7284
             Project: Apache Drill
          Issue Type: New Feature
            Reporter: weijie.tong
            Assignee: weijie.tong
             Fix For: 1.17.0


To HashJoin or HashAggregate, we will shuffle the input data according to hashCodes of join conditions or group by keys at the exchange nodes. This computing of the hash codes will be redo at the HashJoin or HashAggregate nodes. We could send the computed hashCodes of exchange nodes to the upper nodes. So the HashJoin or HashAggregate nodes will not need to do the hash computing again.





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