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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2016/06/16 21:54:05 UTC

[jira] [Work started] (HIVE-14021) When converting to CNF, fail if the expression exceeds a threshold

     [ https://issues.apache.org/jira/browse/HIVE-14021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-14021 started by Jesus Camacho Rodriguez.
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> 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
>         Attachments: 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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