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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2016/03/03 19:28:18 UTC
[jira] [Commented] (CALCITE-759) Add DayOfWeek and other missing
date/time functions
[ https://issues.apache.org/jira/browse/CALCITE-759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15178310#comment-15178310 ]
Julian Hyde commented on CALCITE-759:
-------------------------------------
Microsoft SQL Server has CONVERT and DATEDIFF.
> 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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