Marios Trivyzas 59b3294bc9 SQL: Implement DATEADD function (#47747)
Implement DATEADD/TIMESTAMPADD function as per the MS-SQL spec:
https://docs.microsoft.com/en-us/sql/t-sql/functions/dateadd-transact-sql?view=sql-server-2017
which allows a user to add/subtract specified number of specified units
to/from a date/datetime field/expression.

Closes: #47746
(cherry picked from commit e624bc281bebb4bbe0b0c2e0a8cbc712e50097a8)
2019-10-10 16:22:13 +02:00
..
2019-10-10 09:55:30 +01:00