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https://issues.apache.org/jira/browse/CALCITE-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364913#comment-16364913
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Jesus Camacho Rodriguez commented on CALCITE-2178:
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[~julianhyde], could you take a look at it? This should go in before 
CALCITE-2179.
https://github.com/apache/calcite/pull/628

Thanks

> Extend expression simplifier to work on datetime FLOOR functions
> ----------------------------------------------------------------
>
>                 Key: CALCITE-2178
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2178
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>             Fix For: 1.16.0
>
>
> Extend expression simplifier to support:
> {code}
> FLOOR(FLOOR(CAST( '2010-01-10 00:00:00' AS TIMESTAMP) TO HOUR) TO DAY) => 
> FLOOR(CAST( '2010-01-10 00:00:00' AS TIMESTAMP) TO DAY)
> {code}



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