Hi @cmtoomey thanks for your question.
The SQL editor in Immerse is in beta now. We are adding functionality to show query history as well as allow you to navigate tables/columns of a database. The new version of the editor should land within the next month or so.
If you currently need full SQL CLI access you can use mapdql from the command line. It uses the usual Postgres metadata syntax like \d and \t instead of the mysql syntax (i.e. show tables).
Let us know if this helps.