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https://issues.apache.org/jira/browse/DRILL-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Turton closed DRILL-8088.
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Resolution: Fixed
> Improve expression evaluation performance
> -----------------------------------------
>
> Key: DRILL-8088
> URL: https://issues.apache.org/jira/browse/DRILL-8088
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Codegen
> Affects Versions: 1.19.0
> Reporter: wtf
> Assignee: wtf
> Priority: Minor
> Fix For: 1.20.0
>
>
> Found unnecessary map copy when doing expression evaluation, it will slow
> down the codegen when the query include many "case when" or avg/stddev(the
> reduced expressions include "case when"). In our case, the query include 314
> avg, it takes 3+ seconds to generate the projector expressions(Intel(R)
> Xeon(R) CPU E5-2682 v4 @ 2.50GHz 32cores).
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