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https://issues.apache.org/jira/browse/IMPALA-10799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xianqing He updated IMPALA-10799:
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Affects Version/s: Impala 3.2.0
> Analysis slowdown with inline views and thousands of column
> -----------------------------------------------------------
>
> Key: IMPALA-10799
> URL: https://issues.apache.org/jira/browse/IMPALA-10799
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 3.2.0
> Reporter: Xianqing He
> Assignee: Xianqing He
> Priority: Major
>
> If there are thousands of columns in the inlineview, it‘s very slow in
> analysis. For example, this sql will take almost 4s in analysis if the inline
> view has tens of thousands of column
> {code:java}
> select c1 from (select c1, c2... c10001 from T) T
> Query Compilation: 3s880ms
> - Translate start: 968.000ns (968.000ns)
> - Translate finished: 4.318ms (4.317ms)
> - Metadata of all 1 tables cached: 42.219ms (37.900ms)
> - Analysis finished: 3s776ms (3s734ms)
> - Value transfer graph computed: 3s806ms (30.163ms)
> - Single node plan created: 3s869ms (62.556ms)
> - Runtime filters computed: 3s874ms (5.603ms)
> - Distributed plan created: 3s874ms (128.086us)
> - Planning finished: 3s880ms (5.836ms)
> {code}
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