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https://issues.apache.org/jira/browse/CALCITE-1177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15235652#comment-15235652
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Julian Hyde commented on CALCITE-1177:
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Let's just use the "obvious" definition of calendar, not try to make it
locale-specific. The functions will give the same answers regardless of the
client's or server's locale. They can be implemented using simple div / modulo.
Also remember these functions should not be using time zone in any way.
> Add support for more time units in extract function
> ---------------------------------------------------
>
> Key: CALCITE-1177
> URL: https://issues.apache.org/jira/browse/CALCITE-1177
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Venki Korukanti
> Assignee: Julian Hyde
>
> Currently extract function support following units YEAR, MONTH, DAY, HOUR,
> MINUTE, SECOND. Add support for more units: CENTURY, DECADE, DOW, DOY, EPOCH,
> MILLENNIUM, QUARTER, WEEK.
> Definitions of these units is similar to Postgres:
> http://www.postgresql.org/docs/9.1/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
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