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https://issues.apache.org/jira/browse/CALCITE-5698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723285#comment-17723285
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Julian Hyde commented on CALCITE-5698:
--------------------------------------
I reviewed, and suggested minor changes. "EXTRACT from INTERVAL should return
negative numbers if interval is negative" would be a better summary and commit
message, in my opinion.
> EXTRACT from INTERVAL partially does not follow the SQL standard
> ----------------------------------------------------------------
>
> Key: CALCITE-5698
> URL: https://issues.apache.org/jira/browse/CALCITE-5698
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: Evgeny Stanilovsky
> Assignee: Evgeny Stanilovsky
> Priority: Major
> Labels: pull-request-available
>
> From SQL standard we can found:
> {noformat}
> ISO/IEC 9075-2:1999 (E)
> 6.17 <numeric value function>:
> If <extract field> is a <primary datetime field>, then the result is the
> value of the datetime
> field identified by that <primary datetime field> and has the same sign as
> the <extract
> source>.{noformat}
> other data bases are follow this rule, i.e. :
> {noformat}
> SELECT
> EXTRACT (MONTH FROM INTERVAL '-1' MONTH)
> FROM
> DUAL;{noformat}
> returns: *-1*
> and ** the other one:
> {noformat}
> SELECT EXTRACT(MONTH FROM INTERVAL '-1 MONTHS'){noformat}
> return the same result,
> while calcite:
> {noformat}
> SELECT EXTRACT(MONTH FROM INTERVAL -1 MONTHS) AS extracted;{noformat}
> {noformat}
> < +---------+
> < | -1 |
> < +---------+
> ---
> > +-----------+
> > | 11 |
> > +-----------+{noformat}
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