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https://issues.apache.org/jira/browse/DRILL-7284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857498#comment-16857498
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weijie.tong commented on DRILL-7284:
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It will have a option for user to decide whether to pay for the additional
network and memory cost.
> 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
> Priority: Major
> 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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