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https://issues.apache.org/jira/browse/HIVE-14021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360939#comment-15360939
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Lefty Leverenz commented on HIVE-14021:
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Doc note: This adds *hive.cbo.cnf.maxnodes* to HiveConf.java so it will need
to be documented in the wiki for releases 2.1.1 and 2.2.0.
Put it after the other hive.cbo.* parameters:
* [Configuration Properties -- hive.cbo.enable |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cbo.enable]
* [Configuration Properties -- hive.cbo.returnpath.hiveop |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cbo.returnpath.hiveop]
Added TODOC2.1.1 and TODOC2.2 labels.
> When converting to CNF, fail if the expression exceeds a threshold
> ------------------------------------------------------------------
>
> Key: HIVE-14021
> URL: https://issues.apache.org/jira/browse/HIVE-14021
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Affects Versions: 2.1.0, 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Minor
> Labels: TODOC2.1.1, TODOC2.2
> Fix For: 2.2.0, 2.1.1
>
> Attachments: HIVE-14021.1.patch, HIVE-14021.2.patch, HIVE-14021.patch
>
>
> When converting to conjunctive normal form (CNF), fail if the expression
> exceeds a threshold. CNF can explode exponentially in the size of the input
> expression, but rarely does so in practice. Add a maxNodeCount parameter to
> RexUtil.toCnf and throw or return null if it is exceeded.
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