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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2015/06/15 21:27:01 UTC

[jira] [Created] (CALCITE-759) Add DayOfWeek and other missing date/time functions

Julian Hyde created CALCITE-759:
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             Summary: 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


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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