After upgrading to MySQL 8 we noticed that the MySQL date function fails if given an empty string, and throws the following error message:
Incorrect DATE value: ''
In MySQL we had a condition in the WHERE clause which short circuit evaluated to not try the date function if a value was blank
WHERE Date_Added = '' OR (date(Date_Added) >= '')
But in MySQL 8 the date function appears to be evaluated for date literals even if that side of the OR statement isn't the side that gets short circuited evaluated.
The solution appears to be to set the session-wide SQL mode to ALLOW_INVALID_DATES