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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:
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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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