데비안 9.5 에서부터는 mysql 이 mariadb 로 완전히 대체 되는건가요?

방금 데비안 9.5 설치를 했는데요.

저는 분명 apt-get install mysql-server mysql-client  라고 했는데

mysql 셀 접속하니 "Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others" 가 보이네요.

제가 무엇을 잘못한건지 아니면 

데비안 9.5 부터는 mysql 을 MariaDB 로 완전히 대체하는건지

도대체 어찌된 영문인가요?

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헉..

"Moving from MySQL to MariaDB in Debian 9" 참고 주소 : https://mariadb.com/kb/en/library/moving-from-mysql-to-mariadb-in-debian-9/

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참고 주소 : https://www.debian.org/releases/stable/amd64/release-notes/ch-whats-new.en.html#mariadb-replaces-mysql

2.2.4. MariaDB replaces MySQL
MariaDB is now the default MySQL variant in Debian, at version 10.1. The stretch release introduces a new mechanism for switching the default variant, using metapackages created from the mysql-defaults source package. For example, installing the metapackage default-mysql-server will install mariadb-server-10.1. Users who had mysql-server-5.5 or mysql-server-5.6 will have it removed and replaced by the MariaDB equivalent. Similarly, installing default-mysql-client will install mariadb-client-10.1.

Important
Note that the database binary data file formats are not backwards compatible, so once you have upgraded to MariaDB 10.1 you will not be able to switch back to any previous version of MariaDB or MySQL unless you have a proper database dump. Therefore, before upgrading, please make backups of all important databases with an appropriate tool such as mysqldump.
The virtual-mysql-* and default-mysql-* packages will continue to exist. MySQL continues to be maintained in Debian, in the unstable release. See the Debian MySQL Team wiki page for current information about the mysql-related software available in Debian.