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

["Anton Bankovskii (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791543#comment-16791543 ] 

Anton Bankovskii commented on CALCITE-759:
------------------------------------------

[~julianhyde], since there are several functions to be added in the scope of this task, I believe it should be split. I had created a sub-task for TO_TIMESTAMP implementation, will take a look on that one

> 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
>          Components: babel
>            Reporter: 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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