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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14021) When converting to CNF, fail if the expression exceeds a threshold
Date Wed, 22 Jun 2016 15:01:57 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344432#comment-15344432
] 

Ashutosh Chauhan commented on HIVE-14021:
-----------------------------------------

+1 pending tests.

> 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-14021.1.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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