Work with Gravity Forms Chained Selects
Gravity Forms includes a Chained Selects field type. Gravity View is able to treat these field types as "text" when implementing a search, but probably should treat them like Dropdown Select Lists as this is how they are implemented in Gravity Forms.
Chained Selects can be seen here: https://www.gravityforms.com/add-ons/chained-selects/
Simon Webster shared this idea