for k, v := range map[string][]string{
		"table.name":         {"table", "name"},
		"`table`.`name`":     {"table", "name"},
		"'table'.'name'":     {"table", "name"},
		"'table'.name":       {"table", "name"},
		"table1.name_23":     {"table1", "name_23"},
		"`table_1`.`name23`": {"table_1", "name23"},
		"'table23'.'name_1'": {"table23", "name_1"},
		"'table23'.name1":    {"table23", "name1"},
		"'name1'":            {"", "name1"},

		}

		if DB.Migrator().HasConstraint(&User{}, name) {
			t.Fatalf("constraint %v should been deleted", name)
		}

		if err := DB.Migrator().CreateConstraint(&User{}, name); err != nil {
			t.Fatalf("failed to create constraint %v, got error %v", name, err)
		}

		if !DB.Migrator().HasConstraint(&User{}, name) {
			t.Fatalf("failed to found constraint %v", name)
		}
	}
}

	DB.Where("name1 = @name OR name2 = @name OR name3 = @name", sql.Named("name", "jinzhu2")).First(&result2)

	AssertEqual(t, result2, namedUser)

	var result3 NamedUser
	DB.Where("name1 = @name OR name2 = @name OR name3 = @name", map[string]interface{}{"name": "jinzhu2"}).First(&result3)

	AssertEqual(t, result3, namedUser)

	var result4 NamedUser

	}, {
		SQL:          "name1 = @name1 AND name2 = @name2 AND name3 = @name1",
		Vars:         []interface{}{sql.Named("name1", "jinzhu"), sql.Named("name2", "jinzhu2")},
		Result:       "name1 = ? AND name2 = ? AND name3 = ?",
		ExpectedVars: []interface{}{"jinzhu", "jinzhu2", "jinzhu"},
	}, {
		SQL:          "name1 = @name1 AND name2 = @name2 AND name3 = @name1",
		Vars:         []interface{}{map[string]interface{}{"name1": "jinzhu", "name2": "jinzhu2"}},

		{Name: "Name3", DBName: "name3", BindNames: []string{"Name3"}, DataType: schema.String, Tag: `gorm:"<-"`, Creatable: true, Updatable: true, Readable: true},
		{Name: "Name4", DBName: "name4", BindNames: []string{"Name4"}, DataType: schema.String, Tag: `gorm:"<-:create"`, Creatable: true, Updatable: false, Readable: true},

		},
		"idx_oid": {
			Name:   "idx_oid",
			Class:  "UNIQUE",
			Fields: []schema.IndexOption{{Field: &schema.Field{Name: "OID", UniqueIndex: "idx_oid"}}},
		},
		"type": {
			Name:   "type",
			Type:   "",
			Fields: []schema.IndexOption{{Field: &schema.Field{Name: "Name7"}}},
		},
		"idx_user_indices_name8": {

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;

import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Qualifier
@Retention(RUNTIME)
@Documented
public @interface Named {
    String value() default "";

	}

	var names []string
	DB.Table("users").Where("name like ?", "distinct%").Order("name").Pluck("name", &names)
	AssertEqual(t, names, []string{"distinct", "distinct", "distinct", "distinct-2", "distinct-3"})

	var names1 []string
	DB.Model(&User{}).Where("name like ?", "distinct%").Distinct().Order("name").Pluck("Name", &names1)

	AssertEqual(t, names1, []string{"distinct", "distinct-2", "distinct-3"})

		}

		for _, name := range []string{"Name", "Constraint"} {
			if reflect.ValueOf(result).FieldByName(name).Interface() != reflect.ValueOf(v).FieldByName(name).Interface() {
				t.Errorf(
					"check %v %v should equal, expects %v, got %v",
					k, name, reflect.ValueOf(result).FieldByName(name).Interface(), reflect.ValueOf(v).FieldByName(name).Interface(),
				)
			}
		}
	}
}

// "execution" of operation, i.e. adding them to the function.
class GraphContext : public TracingContext {
 public:
  explicit GraphContext(const char* name)
      : TracingContext(kGraph),
        graph_(new TF_Graph(), TF_DeleteGraph),
        name_(name) {}

  void Release() override { delete this; }

  TracingOperation* CreateOperation() override {
    return new GraphOperation(graph_.get());
  }