SQL supports hidden columns: columns that are only included in a projection if explicitly requested. An example of this is the rowid column that is created on tables without explicitly primary keys.

Currently, there is no way to get a hidden column on a user-defined table: it's only possible if you manually set the hidden boolean in the table descriptor, by editing the CockroachDB source code

Currently, the JDBC string containing the host name and port is hardcoded. For example, consider the connection string for MySQL:

https://github.com/sqlancer/sqlancer/blob/e62224edcb43fe421dc87601f75090739e34e595/src/sqlancer/mysql/MySQLProvider.java#L248

It would be desirable to make this configurable. We could provide an option to set the JDBC string for each DBMS. For example, for MySQL,