The “Misc features” preview includes all the other features that did not make it into a separate dedicated preview binary.
MariaDB Server 10.7 includes the JSON_EQUALS function, which compares inputs as JSON objects, regardless of whitespace, key order, or number format.
By default, MariaDB does not check if a user reuses a password. Some security policies require users to choose a new password each time, and the Password Reuse Check plugin, available in a MariaDB 10.7.0 preview, enables this functionality.
Old passwords are stored in the mysql.password_reuse_check_history table, and the period they are retained for is determined by the password-reuse-check-interval system variable, which specifies a number of days. By default this is zero, meaning unlimited retention.
If you are using table partitioning, you have likely heard of the ALTER TABLE … EXCHANGE PARTITION … WITH TABLE … command. It existed in MariaDB since forever. But if you check the manual (any manual) or search the web, you will see that almost the only use case of it is converting a partition to a standalone non-partitoned table, or converting a standalone non-partitoned table into a partition.
And the usage was designed back then to be anything but obvious. To convert a partition to a table you need first to create an empty table with the same structure as a partition, then you exchange it with a partition, and then you drop the empty partition.
Sometimes there is a need to combine data from different columns into one string. For example,
SELECT CONCAT(first_name, ‘ ‘, last_name) FROM employees;
This doesn’t look too bad, but can quickly get out of hand, if you need to do something more complex than that. For example, let’s say, we also need to mention the salary here:
SELECT CONCAT(first_name, ‘ ‘, last_name, ‘ -‘, CAST(FORMAT(salary, 0) AS VARCHAR(10)), ‘ ‘, currency) FROM employees;