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Posted to issues@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2016/07/04 07:00:18 UTC
[jira] [Updated] (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 ]
Lefty Leverenz updated HIVE-14021:
----------------------------------
Labels: TODOC2.1.1 TODOC2.2 (was: )
> 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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