Marios Trivyzas 7fddf198b7 SQL: Implement DATEDIFF function (#47920)
Implement DATEDIFF/TIMESTAMPDIFF function as per the MS-SQL spec:
https://docs.microsoft.com/en-us/sql/t-sql/functions/datediff-transact-sql?view=sql-server-2017
which allows a user to substract two date/datetime fields and return the
difference in the date/time unit specified.

Closes: #47919
(cherry picked from commit 745699f38dc8222670ffd65b66df33b5da39040b)
2019-10-15 15:12:11 +02:00
..