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https://issues.apache.org/jira/browse/CALCITE-2334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16494426#comment-16494426
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Jesus Camacho Rodriguez commented on CALCITE-2334:
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bq. Is it not valid to simplify CEIL(CEIL(x TO HOUR) TO YEAR) to CEIL(x TO
YEAR)? Because an HOUR never crosses a YEAR boundary.
What would be the expected result for {{CEIL('2011-12-31 23:59:59' TO HOUR)}}?
{{'2011-12-31 00:00:00'}} or {{'2012-01-01 00:00:00'}}? I was not sure, that is
why I disabled the simplification for CEIL all together in CALCITE-2332.
> 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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