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https://issues.apache.org/jira/browse/CALCITE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491186#comment-16491186
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Julian Hyde commented on CALCITE-759:
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I'd like to have the DAYOFWEEK, DAYOFMONTH, DAYOFYEAR, QUARTER functions from
MySQL, but in a way that people can turn them off. The "Babel" parser is the
place to be all things to everyone, but the core Calcite parser/validator
should only have one (good) way to do each thing.
> Add DayOfWeek and other missing date/time functions
> ---------------------------------------------------
>
> Key: CALCITE-759
> URL: https://issues.apache.org/jira/browse/CALCITE-759
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Labels: dialect, newbie
>
> Calcite implements EXTRACT, FLOOR, CEIL, CAST, +, - on date/time values and
> much can be accomplished with these. But there are other useful functions in
> other databases.
> For example MySQL has DayOfWeek. See
> https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html. It is
> tricky to achieve the same in Calcite (you'd need to subtract the epoch and
> take the interval modulo 7).
> We need to review the date/time functions in MySQL, Postgres and Oracle, and
> add functions to ensure that you can accomplish the same things in Calcite
> fairly easily.
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