[jira] [Updated] (SPARK-51554) Add the time_trunc() function

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-51554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated SPARK-51554:
-----------------------------------
    Labels: pull-request-available  (was: )

> Add the time_trunc() function
> -----------------------------
>
>                 Key: SPARK-51554
>                 URL: https://issues.apache.org/jira/browse/SPARK-51554
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 4.1.0
>            Reporter: Max Gekk
>            Priority: Major
>              Labels: pull-request-available
>
> The time_trunc() function returns time truncated to the unit specified in unit.
> h4. Syntax
> {code:sql}
> time_trunc(unit, expr)
> {code}
> h4. Arguments
> * unit: A STRING literal.
> * expr: A TIME, or STRING with a valid time format.
> h4. 
> A TIME\(n\) with n matching that of expr.
> h4. Notes
> Valid units for unit are (case-insensitive):
> * 'HOUR': zero out the minute and second with fraction part
> * 'MINUTE': zero out the second with fraction part
> * 'SECOND': zero out the second fraction part
> * 'MILLISECOND': zero out the microseconds
> * 'MICROSECOND': everything remains
> If the unit is not well-formed the function returns NULL.
> h4. Examples
> {code:sql}
> > SELECT time_trunc('HOUR', '09:32:05.359');
>  09:00:00
> > SELECT time_trunc('MILLISECOND', '09:32:05.123456');
>  09:32:05.123
> -- Not a recognised unit
> > SELECT time_trunc('MS', '09:32:05.123456');
>  NULL
> {code}



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