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Posted to issues@drill.apache.org by "wtf (Jira)" <ji...@apache.org> on 2021/12/20 15:16:00 UTC

[jira] [Created] (DRILL-8088) Improve expression generation performance

wtf created DRILL-8088:
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             Summary: Improve expression generation performance
                 Key: DRILL-8088
                 URL: https://issues.apache.org/jira/browse/DRILL-8088
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Codegen
            Reporter: wtf
            Assignee: wtf


Found unnessesery 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 around 4 seconds to generate the projector expressions.



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