assertEqualCharNodes(traverser.breadthFirst(charactersOf("h")), "hdegabcf");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("gd")), "gdfabc");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("age")), "agef");
  }

  @Test
  public void forTree_breadthFirst_cyclicGraphContainingTree() throws Exception {
    Traverser<Character> traverser = Traverser.forTree(CYCLIC_GRAPH_CONTAINING_TREE);

	doubleAgeRes := &result{}
	if err := DB.Table("users").Select("age + age as age").Where("id = ?", user3.ID).Scan(&doubleAgeRes).Error; err != nil {
		t.Errorf("Scan to pointer of pointer")
	}

	if doubleAgeRes.Age != int(res.Age)*2 {
		t.Errorf("Scan double age as age, expect: %v, got %v", res.Age*2, doubleAgeRes.Age)
	}

	var results []result
	DB.Table("users").Select("name, age").Where("id in ?", []uint{user2.ID, user3.ID}).Scan(&results)

	checkField(t, userSchema, reflectValue, newValues)

	// test valuer and other type
	age2 := myint(10)
	newValues2 := map[string]interface{}{
		"name":       sql.NullString{String: "valuer_and_setter_3", Valid: true},
		"id":         &sql.NullInt64{Int64: 3, Valid: true},
		"created_at": tests.Now(),
		"deleted_at": time.Now(),
		"age":        &age2,
		"birthday":   mytime(time.Now()),
		"active":     mybool(true),
	}

			}},
			"SELECT * FROM `users` WHERE `age` = ? OR `name` <> ?",
			[]interface{}{18, "jinzhu"},
		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{

	}{
		{
			SQL:           "create table users (name, age, height, actived, bytes, create_at, update_at, deleted_at, email, role, pass) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
			NumericRegexp: nil,
			Vars:          []interface{}{"jinzhu", 1, 999.99, true, []byte("12345"), tt, &tt, nil, "w@g.\"com", myrole, pwd},

	if res.Name != "" {
		t.Errorf("Expected res.Name to be empty, but got %s", res.Name)
	}
	if res.Age != user.Age {
		t.Errorf("Expected res.Age to be %d, but got %d", user.Age, res.Age)
	}
}

func TestPluckWithSelect(t *testing.T) {
	users := []User{
		{Name: "pluck_with_select_1", Age: 25},
		{Name: "pluck_with_select_2", Age: 26},
	}

	DB.Create(&users)

	var userAges []int

	users := []User{{
		Name:     "groupby",
		Age:      10,
		Birthday: Now(),
		Active:   true,
	}, {
		Name:     "groupby",
		Age:      20,
		Birthday: Now(),
	}, {
		Name:     "groupby",
		Age:      30,
		Birthday: Now(),
		Active:   true,
	}, {
		Name:     "groupby1",
		Age:      110,
		Birthday: Now(),
	}, {
		Name:     "groupby1",
		Age:      220,
		Birthday: Now(),
		Active:   true,

		Name  string
		Email string `gorm:"default:(-)"`
		Age   int    `gorm:"default:(-)"`
	}

	s, err := schema.Parse(&user{}, schemaCache, schema.NamingStrategy{})
	if err != nil {
		t.Errorf("parse schema error: %v, is not expected", err)
		return
	}
	dest := []*user{
		{
			ID:    1,
			Name:  "alice",
			Email: "email",
			Age:   18,
		},
		{
			ID:    2,
			Name:  "bob",
			Email: "email",

{"name":"Michael", "age": 31}
{"name":"Andy", "age": 30}

	}, tx.Error)
	tx.Logger = currentLogger
	return
}

// Pluck queries a single column from a model, returning in the slice dest. E.g.:
//
//	var ages []int64
//	db.Model(&users).Pluck("age", &ages)
func (db *DB) Pluck(column string, dest interface{}) (tx *DB) {
	tx = db.getInstance()
	if tx.Statement.Model != nil {
		if tx.Statement.Parse(tx.Statement.Model) == nil {