mariadb-upgrade from MySQL 5.7 pollutes stdout on some sys schema views

• Use data from MySQL 5.7 and run mariadb-upgrade (10.6 tested)

  $ docker stop mariadb-server-2

  $ # cd </path/of/mysql-data>

  $ sudo cp -r mysql-data /tmp/mysql-data

  $ sudo chown -R 999:docker /tmp/mysql-data

  $ docker container run --rm --name mariadb-server-2 -v /tmp/mysql-data:/var/lib/mysql \

  -e MARIADB_ROOT_PASSWORD=secret -d mariadb:latest

  Start upgrade

  $ docker exec -it mariadb-server-2 mariadb-upgrade test1 books -uroot -psecret

In attachment is the example.