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From "Zoltan Haindrich (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-20692) IS (NOT) [TRUE|FALSE] logic functions are not folded by Calcite
Date Fri, 05 Oct 2018 09:16:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zoltan Haindrich reassigned HIVE-20692:
---------------------------------------


> IS (NOT) [TRUE|FALSE] logic functions are not folded by Calcite
> ---------------------------------------------------------------
>
>                 Key: HIVE-20692
>                 URL: https://issues.apache.org/jira/browse/HIVE-20692
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>
> Expressions like: {{not ((a>0) is not true)}} could be rewritten to {{(a>0) is
true}}.
> However currently this doesn't happen because some of these functions are not translated
for Calcite.
> {code}
> create table t (a integer);
> explain select not ((a>0) is not true) from t group by a;
> [...]
> expressions: (not (_col0 > 0) is not true) (type: boolean) |
> [...]
> {code}



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