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https://issues.apache.org/jira/browse/DRILL-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14352604#comment-14352604
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Venki Korukanti commented on DRILL-2209:
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New patch LGTM, +1.
One suggestion discussed offline: currently we are inserting project only when
MUX is enabled. I think it is a good idea to enable it when MUX and/or DEMUX is
enabled. We can address this in a separate JIRA as the demux is disabled by
default.
> Save on CPU cycles by adding Project with column that has hash calculated
> -------------------------------------------------------------------------
>
> Key: DRILL-2209
> URL: https://issues.apache.org/jira/browse/DRILL-2209
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow, Query Planning & Optimization
> Reporter: Yuliya Feldman
> Assignee: Yuliya Feldman
>
> Related to DRILL-133. Wrapping HashToRandomExhcnage and/or LocalExchange with
> Project operator with additional column that represents hash function of
> column(s) we are hashing on. This is to save CPU cycles and not recalculate
> hash every time
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