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https://issues.apache.org/jira/browse/IMPALA-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-5081.
-----------------------------------
    Fix Version/s: Impala 4.4.0
       Resolution: Fixed

> Expose IR optimization level via query option
> ---------------------------------------------
>
>                 Key: IMPALA-5081
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5081
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Michael Ho
>            Assignee: Michael Smith
>            Priority: Minor
>              Labels: codegen
>             Fix For: Impala 4.4.0
>
>
> Certain queries may spend a lot of time in the IR optimization. Currently, 
> there is a start-up option to disable optimization in LLVM. However, it may 
> be of inconvenience to users to have to restart the entire Impala cluster to 
> just use that option. This JIRA aims at exploring exposing a query option for 
> users to choose the optimization level for a given query (e.g. we can have a 
> level which just only have a dead code elimination pass or no optimization at 
> all).



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