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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