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https://issues.apache.org/jira/browse/TAJO-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyoungjun Kim resolved TAJO-872.
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       Resolution: Implemented
    Fix Version/s: 0.8.1
                   0.9.0

I tested window function branch. The master branch is already fixed. 

> NOW() function has a different value on each task.
> --------------------------------------------------
>
>                 Key: TAJO-872
>                 URL: https://issues.apache.org/jira/browse/TAJO-872
>             Project: Tajo
>          Issue Type: Bug
>            Reporter: Hyoungjun Kim
>            Assignee: Hyoungjun Kim
>            Priority: Trivial
>             Fix For: 0.9.0, 0.8.1
>
>
> I tested with the following query.
> {code:sql}
> select col1, count(*) 
> from (select now() col1 from lineitem) a 
> group by col1 
> {code}
> The query must return one row, but several rows.



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