Poor performance after upgrade from 10.1.14 to 10.1.16

After the upgrade from the 10.1.14 to 10.1.16, I have detected that some queries need a lot of time to be executed.

When I have downgraded to the 10.1.14, I have checked that the problem has dissapeared. I have executed the mysql_upgrade after each upgrade.

I attach some files that I expect that help you to understand the problem and fix it.

• saltos-10.1.14.log => contains the log of all queries executed by SaltOS to get the list page - using a MariaDB 10.1.14.
• saltos-10.1.16.log => contains the log of all queries executed by SaltOS to get the list page using a MariaDB 10.1.16.
• query.sql => contains the conflictive query!!!
• explain-10.1.14.log => contains the explain extended command for the previous query using a MariaDB 10.1.14.
• explain-10.1.16.log => contains the explain extended command for the same query using a MariaDB 10.1.16.
• schema.sql => contains the schema used by the SaltOS's database.
• used-size.pdf => contains the real used size to understand the problem.