[
https://issues.apache.org/jira/browse/IMPALA-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Work on IMPALA-5443 started by Michael Smith.
---------------------------------------------
> Consider automatically disabling codegen per ExecNode based on planner
> estimates
> --------------------------------------------------------------------------------
>
> Key: IMPALA-5443
> URL: https://issues.apache.org/jira/browse/IMPALA-5443
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 2.9.0
> Reporter: Tim Armstrong
> Assignee: Michael Smith
> Priority: Minor
> Labels: codegen, performance
>
> We should consider automatically disabling codegen per plan node based on the
> number of input/output rows. We have the plumbing already in place (it's used
> to disable codegen for non-grouping merge aggregations) but choosing and
> implementing a good policy is trickier.
> We should be conservative about doing this, because the cost of codegen is
> O(1) but the runtime speedup is O\(n).
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
