[jira] [Created] (SPARK-38284) Add the TIMESTAMPDIFF() function

["Max Gekk (Jira)" <ji...@apache.org>]

Max Gekk created SPARK-38284:
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             Summary: Add the TIMESTAMPDIFF() function
                 Key: SPARK-38284
                 URL: https://issues.apache.org/jira/browse/SPARK-38284
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 3.3.0
            Reporter: Max Gekk
            Assignee: Max Gekk


Two functions that are part of the ODBC api and implemented virtually by ALL other databases are missing in Spark SQL.

TIMESTAMPADD() and TIMESTAMPDIFF()

See
* [Time, Date, and Interval Functions|https://docs.microsoft.com/en-us/sql/odbc/reference/appendixes/time-date-and-interval-functions?view=sql-server-ver15]
* [TIMESTAMPDIFF function (ODBC compatible)|https://docs.faircom.com/doc/sqlref/33477.htm]

The TIMESTAMPDIFF() function is also VERY convenient and would be a great addition because getting the difference between two timestamps in seconds in spark today requires converting to unixtimestamp and back.

{code:sql}
SELECT TIMESTAMPDIFF(SECOND, '2021-12-30 01:02:00':timestamp,  '2021-12-30 01:00:00':timestamp)
>120
-- Current Support
SELECT unix_timestamp('2021-12-30 01:00:00':timestamp) - unix_timestamp('2021-12-30 01:00:00':timestamp)
> 120
{code}






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