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https://issues.apache.org/jira/browse/CALCITE-5449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714326#comment-17714326
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Julian Hyde commented on CALCITE-5449:
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If we did, we would probably want the 7 'WEEK(weekday)' units as well (or maybe
5, since Sunday and Monday are already covered). And we would have to wait for
a new release of Avatica. If you're confident that this would solve the
problem, let's do it.
I have a small concern that if we make ISOWEEK and WEEK(weekday) official units
then custom time units will be left out in the cold - say, some database
supports QUARTER and another doesn't.
> Allow EXTRACT() to accept ISOWEEK and WEEK(WEEKDAY)
> ---------------------------------------------------
>
> Key: CALCITE-5449
> URL: https://issues.apache.org/jira/browse/CALCITE-5449
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Tanner Clary
> Assignee: Tanner Clary
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Implement BigQuery {{EXTRACT()}} Function. {{EXTRACT(part FROM
> date_expression)}} returns the value from the date_expression corresponding
> to the specified part. Calcite currently supports PostgreSQL' {{DATE_PART}}
> which has similar behavior.
> Example: {{SELECT EXTRACT(DAY FROM DATE '2013-12-25')}} would return 25.
> [BigQuery
> Docs|https://g3doc.corp.google.com/company/teams/googlesql/reference/date_functions.md#extract
> ]
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