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https://issues.apache.org/jira/browse/IMPALA-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17758478#comment-17758478
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Daniel Becker commented on IMPALA-5081:
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Having a way to invalidate the cache would possibly be useful in testing also.
How difficult would it be to do it? It it's complicated or opens up the
possibility for subtle errors we should not do it.
> 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
>
> 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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