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https://issues.apache.org/jira/browse/HIVE-9644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533161#comment-14533161
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Ashutosh Chauhan commented on HIVE-9644:
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Created HIVE-10645 for stats annotator issue.

> Fold case & when udfs
> ---------------------
>
>                 Key: HIVE-9644
>                 URL: https://issues.apache.org/jira/browse/HIVE-9644
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>    Affects Versions: 0.14.0, 1.0.0, 1.1.0
>            Reporter: Gopal V
>            Assignee: Ashutosh Chauhan
>             Fix For: 1.2.0
>
>         Attachments: HIVE-9644.1.patch, HIVE-9644.2.patch, HIVE-9644.3.patch, 
> HIVE-9644.patch
>
>
> Constant folding for queries don't kick in for some automatically generated 
> query patterns which look like this.
> {code}
> hive> explain select count(1) from store_sales where (case ss_sold_date when 
> '1998-01-01' then 1 else null end)=1;
> {code}
> This should get rewritten by pushing the equality into the case branches.
> {code}
> select count(1) from store_sales where (case ss_sold_date when '1998-01-01' 
> then 1=1 else null=1 end);
> {code}
> Ending up with a simplified filter condition, resolving itself as 
> {code}
> select count(1) from store_sales where ss_sold_date= '1998-01-01' ;
> {code}



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