[jira] [Comment Edited] (CALCITE-2334) Extend simplification of expressions with CEIL function over date types

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-2334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16494421#comment-16494421 ] 

Julian Hyde edited comment on CALCITE-2334 at 5/29/18 10:55 PM:
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Also, CEIL and FLOOR are duals, because CEIL\(x) === -FLOOR(-x). So, I would be surprised if there were rewrites that apply to one but not the other.


was (Author: julianhyde):
Also, CEIL and FLOOR are duals, because CEIL(x) === -FLOOR(-x). So, I would be surprised if there were rewrites that apply to one but not the other.

> Extend simplification of expressions with CEIL function over date types
> -----------------------------------------------------------------------
>
>                 Key: CALCITE-2334
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2334
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Julian Hyde
>            Priority: Minor
>
> CALCITE-2332 disables simplification of CEIL function due to correctness issues.
> {{FLOOR}} and {{CEIL}} cannot be handled with the same logic. For instance, {{CEIL(CEIL(x TO HOUR) TO YEAR)}} cannot be simplified, e.g., '2011-12-31 23:59:59', while {{FLOOR(FLOOR(x TO HOUR) TO YEAR)}} can be simplified. Hence, we need new logic to enable simplification of CEIL function on date types.



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