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https://issues.apache.org/jira/browse/HIVE-20692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated HIVE-20692:
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Attachment: HIVE-20692.01.patch
> Enable folding of NOT x IS (NOT) [TRUE|FALSE] expressions
> ---------------------------------------------------------
>
> 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
> Attachments: HIVE-20692.01.patch, HIVE-20692.01.patch
>
>
> 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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