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https://issues.apache.org/jira/browse/IMPALA-9358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Deschler resolved IMPALA-9358.
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Resolution: Fixed
> 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
> Fix For: Impala 3.4.0
>
>
> 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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