return m.DB.Migrator().CreateConstraint(value, constraint)
		}
		return nil
	})
}

// ColumnTypes return columnTypes []gorm.ColumnType and execErr error
func (m Migrator) ColumnTypes(value interface{}) ([]gorm.ColumnType, error) {
	columnTypes := make([]gorm.ColumnType, 0)
	execErr := m.RunWithValue(value, func(stmt *gorm.Statement) (err error) {

	}

	if columnTypes, err := DB.Migrator().ColumnTypes(&ColumnStruct{}); err != nil {
		t.Fatalf("no error should returns for ColumnTypes")
	} else {
		stmt := &gorm.Statement{DB: DB}
		stmt.Parse(&ColumnStruct2{})

		for _, columnType := range columnTypes {
			switch columnType.Name() {
			case "id":
				if v, ok := columnType.PrimaryKey(); !ok || !v {

	NewValuePool           FieldNewValuePool

	// In some db (e.g. MySQL), Unique and UniqueIndex are indistinguishable.
	// When a column has a (not Mul) UniqueIndex, Migrator always reports its gorm.ColumnType is Unique.
	// It causes field unnecessarily migration.
	// Therefore, we need to record the UniqueIndex on this column (exclude Mul UniqueIndex) for MigrateColumnUnique.
	UniqueIndex string
}