First Column Selector
In this input, specify a valid ProcessWire selector compatible with the choice entered in the first column data source. Some examples:
Example where Pages is the first column data source: template=products, sort=title will be passed to the query:
$pages->find('template=products, sort=title');
Example where Templates is the first column data source: name=products-clothes|products-electronics|products-groceries. This will be fed to the query:
$templates->find('name=products-clothes|products-elecronics|products-groceries');
Example where Users is the first column data source: roles!=38, sort=title, sort=name. This will be passed to a query:
$users->find('roles!=38, sort=title, sort=name');// role with ID 38 == superuser role
