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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2016/08/25 20:02:20 UTC

[jira] [Resolved] (CALCITE-1290) When converting to CNF, fail if the expression exceeds a threshold

     [ https://issues.apache.org/jira/browse/CALCITE-1290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-1290.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.9.0

Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/77315c06.

> When converting to CNF, fail if the expression exceeds a threshold
> ------------------------------------------------------------------
>
>                 Key: CALCITE-1290
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1290
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Jesus Camacho Rodriguez
>             Fix For: 1.9.0
>
>
> 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.
> I don't believe it is possible to predict the size of the CNF from the input expression (especially if there are duplicate terms) but I might be wrong.



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