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https://issues.apache.org/jira/browse/HIVE-28705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17921688#comment-17921688
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Shohei Okumiya commented on HIVE-28705:
---------------------------------------

I am feeling Calcite should convert `case when month='2023-07' then false else 
true END` into a simpler expression such as `month='2023-07'`. I'm not 100% 
confident.

> Data Inconsistency due to missing 'IS NOT? TRUE/FALSE' parsing in Partition 
> Filter Pruning
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-28705
>                 URL: https://issues.apache.org/jira/browse/HIVE-28705
>             Project: Hive
>          Issue Type: Bug
>            Reporter: chiranjeevi
>            Assignee: Indhumathi Muthumurugesh
>            Priority: Major
>              Labels: pull-request-available
>
> create table t1(id string) partitioned by (month string);
> insert into t1 select '1','2020-12';
> set hive.cbo.enable=false;
> select id from t1 where (case when month='2023-07' then false else true END);
> -- output: 1
> set hive.cbo.enable=true;
> select id from t1 where (case when month='2023-07' then false else true END);
> -- ouput: \{no result}



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