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https://issues.apache.org/jira/browse/CALCITE-1663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15886117#comment-15886117
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Julian Hyde commented on CALCITE-1663:
--------------------------------------

What do you consider to be the definitive spec of TIMESTAMPDIFF? It is not in 
the SQL standard.

> TIMESTAMPDIFF declares operand type DATETIME instead of TIMESTMAP
> -----------------------------------------------------------------
>
>                 Key: CALCITE-1663
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1663
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Remus Rusanu
>            Assignee: Julian Hyde
>
> {{SqlTimestampDiffFunction}} operands are declared 
> {{SqlTypeFamily.DATETIME}}, not {{SqlTypeFamily.TIMESTAMP}}.



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