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Posted to issues-all@impala.apache.org by "Kurt Deschler (Jira)" <ji...@apache.org> on 2020/02/04 23:37:00 UTC
[jira] [Assigned] (IMPALA-9358) Query slowdown with inline views
and hundreds of columns
[ https://issues.apache.org/jira/browse/IMPALA-9358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kurt Deschler reassigned IMPALA-9358:
-------------------------------------
Assignee: Kurt Deschler
> Query slowdown with inline views and hundreds of columns
> --------------------------------------------------------
>
> Key: IMPALA-9358
> URL: https://issues.apache.org/jira/browse/IMPALA-9358
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 3.2.0
> Reporter: Kurt Deschler
> Assignee: Kurt Deschler
> Priority: Major
>
> IMPALA-8386 introduced an expensive precondition check using the function ExprSubstitutionMap.checkComposedFrom(). This check has significant performance impact on statements that contain inline views with hundreds of columns. This check needs to be made more efficient to avoid exponential slowdowns with many columns.
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