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https://issues.apache.org/jira/browse/CALCITE-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932382#comment-16932382
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Jacob Roldan commented on CALCITE-1178:
---------------------------------------

Since calcite 1.21 it's possible to do
{code:sql}
   date '1999-03-02' < timestamp '1999-03-03 00:00:00.0'
{code}
but not with {{_between_}}

I don't know if it's a feature (I haven't seen anything in the release note) or 
if it's a bug

> Allow SqlBetweenOperator to compare DATE and TIMESTAMP
> ------------------------------------------------------
>
>                 Key: CALCITE-1178
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1178
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Sean Hsuan-Yi Chu
>            Priority: Major
>
> An expression such as 
> {code}
> date '1999-03-02' between date '1999-03-01' and timestamp '1999-03-03 
> 00:00:00.0'
> {code}
> will incur SqlValidatorException since SqlBetweenOperator does not allow DATE 
> and TIMESTAMP comparison. In terms of usability, it would be great if this 
> type of comparison is allowed in Calcite.  



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