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Posted to issues-all@impala.apache.org by "Riza Suminto (Jira)" <ji...@apache.org> on 2021/03/03 00:44:04 UTC
[jira] [Resolved] (IMPALA-10492) Lower default MAX_CNF_EXPRS query
option
[ https://issues.apache.org/jira/browse/IMPALA-10492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Riza Suminto resolved IMPALA-10492.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Lower default MAX_CNF_EXPRS query option
> ----------------------------------------
>
> Key: IMPALA-10492
> URL: https://issues.apache.org/jira/browse/IMPALA-10492
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend, Frontend
> Affects Versions: Impala 4.0
> Reporter: Tamas Mate
> Assignee: Riza Suminto
> Priority: Minor
> Labels: ramp-up
> Fix For: Impala 4.0
>
>
> Currently MAX_CNF_EXPRS is set to unlimited by default, with a complex querie that container many predicates the CNF rewrite can lead to significant frontend memory usage and eventually OutOfMemory. A potential default value could be in the range of 1000, but it should work well with the current TCP-DS queries.
> cc.: [~amansinha], [~drorke]
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