var db = new QueryFactory();
var compiler = new PostgresCompiler();

var query = db.Query()
    .Select("id")
    .From("table")
    .Include("public", db.Query(), "foreign_id_1", "local_id_1");

// query.Includes.First().Name => "public"
// query.Includes.Count => 1

var clonedQuery = query.Clone();

clonedQuery.Includes.First().Name = "another_relation";
clonedQuery.Include("public", db.Query(), "foreign_id_2", "local_id_2");

// query.Includes.First().Name => "another_relation"
// query.Includes.Count => 2