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https://issues.apache.org/jira/browse/CALCITE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592684#comment-14592684
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Julian Hyde commented on CALCITE-759:
-------------------------------------
Useful MySQL functions: DAYOFWEEK, DAYOFMONTH, DAYOFYEAR, QUARTER.
Postgres supports extra time-units in EXTRACT: CENTURY, DECADE, DOW, DOY,
EPOCH, ISODOW, ISOYEAR, MICROSECONDS, MILLENNIUM (see
http://www.postgresql.org/docs/9.1/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT).
Postgres and Oracle: TO_CHAR(datetime, text) and TO_CHAR(interval, text).
> 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
> Labels: 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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